1 /* Output Dwarf format symbol table information from the GNU C compiler.
2 Copyright (C) 1992, 1993, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001 Free Software Foundation, Inc.
4 Contributed by Ron Guilmette (rfg@monkeys.com) of Network Computing Devices.
6 This file is part of GNU CC.
8 GNU CC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GNU CC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU CC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
25 Notes on the GNU Implementation of DWARF Debugging Information
26 --------------------------------------------------------------
27 Last Major Update: Sun Jul 17 08:17:42 PDT 1994 by rfg@segfault.us.com
28 ------------------------------------------------------------
30 This file describes special and unique aspects of the GNU implementation of
31 the DWARF Version 1 debugging information language, as provided in the GNU
32 version 2.x compiler(s).
34 For general information about the DWARF debugging information language,
35 you should obtain the DWARF version 1.1 specification document (and perhaps
36 also the DWARF version 2 draft specification document) developed by the
37 (now defunct) UNIX International Programming Languages Special Interest Group.
39 To obtain a copy of the DWARF Version 1 and/or DWARF Version 2
40 specification, visit the web page for the DWARF Version 2 committee, at
42 http://www.eagercon.com/dwarf/dwarf2std.htm
44 The generation of DWARF debugging information by the GNU version 2.x C
45 compiler has now been tested rather extensively for m88k, i386, i860, and
46 Sparc targets. The DWARF output of the GNU C compiler appears to inter-
47 operate well with the standard SVR4 SDB debugger on these kinds of target
48 systems (but of course, there are no guarantees).
50 DWARF 1 generation for the GNU g++ compiler is implemented, but limited.
51 C++ users should definitely use DWARF 2 instead.
53 Future plans for the dwarfout.c module of the GNU compiler(s) includes the
54 addition of full support for GNU FORTRAN. (This should, in theory, be a
55 lot simpler to add than adding support for g++... but we'll see.)
57 Many features of the DWARF version 2 specification have been adapted to
58 (and used in) the GNU implementation of DWARF (version 1). In most of
59 these cases, a DWARF version 2 approach is used in place of (or in addition
60 to) DWARF version 1 stuff simply because it is apparent that DWARF version
61 1 is not sufficiently expressive to provide the kinds of information which
62 may be necessary to support really robust debugging. In all of these cases
63 however, the use of DWARF version 2 features should not interfere in any
64 way with the interoperability (of GNU compilers) with generally available
65 "classic" (pre version 1) DWARF consumer tools (e.g. SVR4 SDB).
67 The DWARF generation enhancement for the GNU compiler(s) was initially
68 donated to the Free Software Foundation by Network Computing Devices.
69 (Thanks NCD!) Additional development and maintenance of dwarfout.c has
70 been largely supported (i.e. funded) by Intel Corporation. (Thanks Intel!)
72 If you have questions or comments about the DWARF generation feature, please
73 send mail to me <rfg@netcom.com>. I will be happy to investigate any bugs
74 reported and I may even provide fixes (but of course, I can make no promises).
76 The DWARF debugging information produced by GCC may deviate in a few minor
77 (but perhaps significant) respects from the DWARF debugging information
78 currently produced by other C compilers. A serious attempt has been made
79 however to conform to the published specifications, to existing practice,
80 and to generally accepted norms in the GNU implementation of DWARF.
82 ** IMPORTANT NOTE ** ** IMPORTANT NOTE ** ** IMPORTANT NOTE **
84 Under normal circumstances, the DWARF information generated by the GNU
85 compilers (in an assembly language file) is essentially impossible for
86 a human being to read. This fact can make it very difficult to debug
87 certain DWARF-related problems. In order to overcome this difficulty,
88 a feature has been added to dwarfout.c (enabled by the -dA
89 option) which causes additional comments to be placed into the assembly
90 language output file, out to the right-hand side of most bits of DWARF
91 material. The comments indicate (far more clearly that the obscure
92 DWARF hex codes do) what is actually being encoded in DWARF. Thus, the
93 -dA option can be highly useful for those who must study the
94 DWARF output from the GNU compilers in detail.
98 (Footnote: Within this file, the term `Debugging Information Entry' will
99 be abbreviated as `DIE'.)
102 Release Notes (aka known bugs)
103 -------------------------------
105 In one very obscure case involving dynamically sized arrays, the DWARF
106 "location information" for such an array may make it appear that the
107 array has been totally optimized out of existence, when in fact it
108 *must* actually exist. (This only happens when you are using *both* -g
109 *and* -O.) This is due to aggressive dead store elimination in the
110 compiler, and to the fact that the DECL_RTL expressions associated with
111 variables are not always updated to correctly reflect the effects of
112 GCC's aggressive dead store elimination.
114 -------------------------------
116 When attempting to set a breakpoint at the "start" of a function compiled
117 with -g1, the debugger currently has no way of knowing exactly where the
118 end of the prologue code for the function is. Thus, for most targets,
119 all the debugger can do is to set the breakpoint at the AT_low_pc address
120 for the function. But if you stop there and then try to look at one or
121 more of the formal parameter values, they may not have been "homed" yet,
122 so you may get inaccurate answers (or perhaps even addressing errors).
124 Some people may consider this simply a non-feature, but I consider it a
125 bug, and I hope to provide some GNU-specific attributes (on function
126 DIEs) which will specify the address of the end of the prologue and the
127 address of the beginning of the epilogue in a future release.
129 -------------------------------
131 It is believed at this time that old bugs relating to the AT_bit_offset
132 values for bit-fields have been fixed.
134 There may still be some very obscure bugs relating to the DWARF description
135 of type `long long' bit-fields for target machines (e.g. 80x86 machines)
136 where the alignment of type `long long' data objects is different from
137 (and less than) the size of a type `long long' data object.
139 Please report any problems with the DWARF description of bit-fields as you
140 would any other GCC bug. (Procedures for bug reporting are given in the
141 GNU C compiler manual.)
143 --------------------------------
145 At this time, GCC does not know how to handle the GNU C "nested functions"
146 extension. (See the GCC manual for more info on this extension to ANSI C.)
148 --------------------------------
150 The GNU compilers now represent inline functions (and inlined instances
151 thereof) in exactly the manner described by the current DWARF version 2
152 (draft) specification. The version 1 specification for handling inline
153 functions (and inlined instances) was known to be brain-damaged (by the
154 PLSIG) when the version 1 spec was finalized, but it was simply too late
155 in the cycle to get it removed before the version 1 spec was formally
156 released to the public (by UI).
158 --------------------------------
160 At this time, GCC does not generate the kind of really precise information
161 about the exact declared types of entities with signed integral types which
162 is required by the current DWARF draft specification.
164 Specifically, the current DWARF draft specification seems to require that
165 the type of an non-unsigned integral bit-field member of a struct or union
166 type be represented as either a "signed" type or as a "plain" type,
167 depending upon the exact set of keywords that were used in the
168 type specification for the given bit-field member. It was felt (by the
169 UI/PLSIG) that this distinction between "plain" and "signed" integral types
170 could have some significance (in the case of bit-fields) because ANSI C
171 does not constrain the signedness of a plain bit-field, whereas it does
172 constrain the signedness of an explicitly "signed" bit-field. For this
173 reason, the current DWARF specification calls for compilers to produce
174 type information (for *all* integral typed entities... not just bit-fields)
175 which explicitly indicates the signedness of the relevant type to be
176 "signed" or "plain" or "unsigned".
178 Unfortunately, the GNU DWARF implementation is currently incapable of making
181 --------------------------------
184 Known Interoperability Problems
185 -------------------------------
187 Although the GNU implementation of DWARF conforms (for the most part) with
188 the current UI/PLSIG DWARF version 1 specification (with many compatible
189 version 2 features added in as "vendor specific extensions" just for good
190 measure) there are a few known cases where GCC's DWARF output can cause
191 some confusion for "classic" (pre version 1) DWARF consumers such as the
192 System V Release 4 SDB debugger. These cases are described in this section.
194 --------------------------------
196 The DWARF version 1 specification includes the fundamental type codes
197 FT_ext_prec_float, FT_complex, FT_dbl_prec_complex, and FT_ext_prec_complex.
198 Since GNU C is only a C compiler (and since C doesn't provide any "complex"
199 data types) the only one of these fundamental type codes which GCC ever
200 generates is FT_ext_prec_float. This fundamental type code is generated
201 by GCC for the `long double' data type. Unfortunately, due to an apparent
202 bug in the SVR4 SDB debugger, SDB can become very confused wherever any
203 attempt is made to print a variable, parameter, or field whose type was
204 given in terms of FT_ext_prec_float.
206 (Actually, SVR4 SDB fails to understand *any* of the four fundamental type
207 codes mentioned here. This will fact will cause additional problems when
208 there is a GNU FORTRAN front-end.)
210 --------------------------------
212 In general, it appears that SVR4 SDB is not able to effectively ignore
213 fundamental type codes in the "implementation defined" range. This can
214 cause problems when a program being debugged uses the `long long' data
215 type (or the signed or unsigned varieties thereof) because these types
216 are not defined by ANSI C, and thus, GCC must use its own private fundamental
217 type codes (from the implementation-defined range) to represent these types.
219 --------------------------------
222 General GNU DWARF extensions
223 ----------------------------
225 In the current DWARF version 1 specification, no mechanism is specified by
226 which accurate information about executable code from include files can be
227 properly (and fully) described. (The DWARF version 2 specification *does*
228 specify such a mechanism, but it is about 10 times more complicated than
229 it needs to be so I'm not terribly anxious to try to implement it right
232 In the GNU implementation of DWARF version 1, a fully downward-compatible
233 extension has been implemented which permits the GNU compilers to specify
234 which executable lines come from which files. This extension places
235 additional information (about source file names) in GNU-specific sections
236 (which should be totally ignored by all non-GNU DWARF consumers) so that
237 this extended information can be provided (to GNU DWARF consumers) in a way
238 which is totally transparent (and invisible) to non-GNU DWARF consumers
239 (e.g. the SVR4 SDB debugger). The additional information is placed *only*
240 in specialized GNU-specific sections, where it should never even be seen
241 by non-GNU DWARF consumers.
243 To understand this GNU DWARF extension, imagine that the sequence of entries
244 in the .lines section is broken up into several subsections. Each contiguous
245 sequence of .line entries which relates to a sequence of lines (or statements)
246 from one particular file (either a `base' file or an `include' file) could
247 be called a `line entries chunk' (LEC).
249 For each LEC there is one entry in the .debug_srcinfo section.
251 Each normal entry in the .debug_srcinfo section consists of two 4-byte
252 words of data as follows:
254 (1) The starting address (relative to the entire .line section)
255 of the first .line entry in the relevant LEC.
257 (2) The starting address (relative to the entire .debug_sfnames
258 section) of a NUL terminated string representing the
259 relevant filename. (This filename name be either a
260 relative or an absolute filename, depending upon how the
261 given source file was located during compilation.)
263 Obviously, each .debug_srcinfo entry allows you to find the relevant filename,
264 and it also points you to the first .line entry that was generated as a result
265 of having compiled a given source line from the given source file.
267 Each subsequent .line entry should also be assumed to have been produced
268 as a result of compiling yet more lines from the same file. The end of
269 any given LEC is easily found by looking at the first 4-byte pointer in
270 the *next* .debug_srcinfo entry. That next .debug_srcinfo entry points
271 to a new and different LEC, so the preceding LEC (implicitly) must have
272 ended with the last .line section entry which occurs at the 2 1/2 words
273 just before the address given in the first pointer of the new .debug_srcinfo
276 The following picture may help to clarify this feature. Let's assume that
277 `LE' stands for `.line entry'. Also, assume that `* 'stands for a pointer.
280 .line section .debug_srcinfo section .debug_sfnames section
281 ----------------------------------------------------------------
283 LE <---------------------- *
284 LE * -----------------> "foobar.c" <---
287 LE <---------------------- * |
288 LE * -----------------> "foobar.h" <| |
291 LE <---------------------- * | |
292 LE * -----------------> "inner.h" | |
294 LE <---------------------- * | |
295 LE * ------------------------------- |
300 LE <---------------------- * |
301 LE * -----------------------------------
306 In effect, each entry in the .debug_srcinfo section points to *both* a
307 filename (in the .debug_sfnames section) and to the start of a block of
308 consecutive LEs (in the .line section).
310 Note that just like in the .line section, there are specialized first and
311 last entries in the .debug_srcinfo section for each object file. These
312 special first and last entries for the .debug_srcinfo section are very
313 different from the normal .debug_srcinfo section entries. They provide
314 additional information which may be helpful to a debugger when it is
315 interpreting the data in the .debug_srcinfo, .debug_sfnames, and .line
318 The first entry in the .debug_srcinfo section for each compilation unit
319 consists of five 4-byte words of data. The contents of these five words
320 should be interpreted (by debuggers) as follows:
322 (1) The starting address (relative to the entire .line section)
323 of the .line section for this compilation unit.
325 (2) The starting address (relative to the entire .debug_sfnames
326 section) of the .debug_sfnames section for this compilation
329 (3) The starting address (in the execution virtual address space)
330 of the .text section for this compilation unit.
332 (4) The ending address plus one (in the execution virtual address
333 space) of the .text section for this compilation unit.
335 (5) The date/time (in seconds since midnight 1/1/70) at which the
336 compilation of this compilation unit occurred. This value
337 should be interpreted as an unsigned quantity because gcc
338 might be configured to generate a default value of 0xffffffff
339 in this field (in cases where it is desired to have object
340 files created at different times from identical source files
341 be byte-for-byte identical). By default, these timestamps
342 are *not* generated by dwarfout.c (so that object files
343 compiled at different times will be byte-for-byte identical).
344 If you wish to enable this "timestamp" feature however, you
345 can simply place a #define for the symbol `DWARF_TIMESTAMPS'
346 in your target configuration file and then rebuild the GNU
349 Note that the first string placed into the .debug_sfnames section for each
350 compilation unit is the name of the directory in which compilation occurred.
351 This string ends with a `/' (to help indicate that it is the pathname of a
352 directory). Thus, the second word of each specialized initial .debug_srcinfo
353 entry for each compilation unit may be used as a pointer to the (string)
354 name of the compilation directory, and that string may in turn be used to
355 "absolutize" any relative pathnames which may appear later on in the
356 .debug_sfnames section entries for the same compilation unit.
358 The fifth and last word of each specialized starting entry for a compilation
359 unit in the .debug_srcinfo section may (depending upon your configuration)
360 indicate the date/time of compilation, and this may be used (by a debugger)
361 to determine if any of the source files which contributed code to this
362 compilation unit are newer than the object code for the compilation unit
363 itself. If so, the debugger may wish to print an "out-of-date" warning
364 about the compilation unit.
366 The .debug_srcinfo section associated with each compilation will also have
367 a specialized terminating entry. This terminating .debug_srcinfo section
368 entry will consist of the following two 4-byte words of data:
370 (1) The offset, measured from the start of the .line section to
371 the beginning of the terminating entry for the .line section.
373 (2) A word containing the value 0xffffffff.
375 --------------------------------
377 In the current DWARF version 1 specification, no mechanism is specified by
378 which information about macro definitions and un-definitions may be provided
379 to the DWARF consumer.
381 The DWARF version 2 (draft) specification does specify such a mechanism.
382 That specification was based on the GNU ("vendor specific extension")
383 which provided some support for macro definitions and un-definitions,
384 but the "official" DWARF version 2 (draft) specification mechanism for
385 handling macros and the GNU implementation have diverged somewhat. I
386 plan to update the GNU implementation to conform to the "official"
387 DWARF version 2 (draft) specification as soon as I get time to do that.
389 Note that in the GNU implementation, additional information about macro
390 definitions and un-definitions is *only* provided when the -g3 level of
391 debug-info production is selected. (The default level is -g2 and the
392 plain old -g option is considered to be identical to -g2.)
394 GCC records information about macro definitions and undefinitions primarily
395 in a section called the .debug_macinfo section. Normal entries in the
396 .debug_macinfo section consist of the following three parts:
398 (1) A special "type" byte.
400 (2) A 3-byte line-number/filename-offset field.
402 (3) A NUL terminated string.
404 The interpretation of the second and third parts is dependent upon the
405 value of the leading (type) byte.
407 The type byte may have one of four values depending upon the type of the
408 .debug_macinfo entry which follows. The 1-byte MACINFO type codes presently
409 used, and their meanings are as follows:
411 MACINFO_start A base file or an include file starts here.
412 MACINFO_resume The current base or include file ends here.
413 MACINFO_define A #define directive occurs here.
414 MACINFO_undef A #undef directive occur here.
416 (Note that the MACINFO_... codes mentioned here are simply symbolic names
417 for constants which are defined in the GNU dwarf.h file.)
419 For MACINFO_define and MACINFO_undef entries, the second (3-byte) field
420 contains the number of the source line (relative to the start of the current
421 base source file or the current include files) when the #define or #undef
422 directive appears. For a MACINFO_define entry, the following string field
423 contains the name of the macro which is defined, followed by its definition.
424 Note that the definition is always separated from the name of the macro
425 by at least one whitespace character. For a MACINFO_undef entry, the
426 string which follows the 3-byte line number field contains just the name
427 of the macro which is being undef'ed.
429 For a MACINFO_start entry, the 3-byte field following the type byte contains
430 the offset, relative to the start of the .debug_sfnames section for the
431 current compilation unit, of a string which names the new source file which
432 is beginning its inclusion at this point. Following that 3-byte field,
433 each MACINFO_start entry always contains a zero length NUL terminated
436 For a MACINFO_resume entry, the 3-byte field following the type byte contains
437 the line number WITHIN THE INCLUDING FILE at which the inclusion of the
438 current file (whose inclusion ends here) was initiated. Following that
439 3-byte field, each MACINFO_resume entry always contains a zero length NUL
442 Each set of .debug_macinfo entries for each compilation unit is terminated
443 by a special .debug_macinfo entry consisting of a 4-byte zero value followed
444 by a single NUL byte.
446 --------------------------------
448 In the current DWARF draft specification, no provision is made for providing
449 a separate level of (limited) debugging information necessary to support
450 tracebacks (only) through fully-debugged code (e.g. code in system libraries).
452 A proposal to define such a level was submitted (by me) to the UI/PLSIG.
453 This proposal was rejected by the UI/PLSIG for inclusion into the DWARF
454 version 1 specification for two reasons. First, it was felt (by the PLSIG)
455 that the issues involved in supporting a "traceback only" subset of DWARF
456 were not well understood. Second, and perhaps more importantly, the PLSIG
457 is already having enough trouble agreeing on what it means to be "conforming"
458 to the DWARF specification, and it was felt that trying to specify multiple
459 different *levels* of conformance would only complicate our discussions of
460 this already divisive issue. Nonetheless, the GNU implementation of DWARF
461 provides an abbreviated "traceback only" level of debug-info production for
462 use with fully-debugged "system library" code. This level should only be
463 used for fully debugged system library code, and even then, it should only
464 be used where there is a very strong need to conserve disk space. This
465 abbreviated level of debug-info production can be used by specifying the
466 -g1 option on the compilation command line.
468 --------------------------------
470 As mentioned above, the GNU implementation of DWARF currently uses the DWARF
471 version 2 (draft) approach for inline functions (and inlined instances
472 thereof). This is used in preference to the version 1 approach because
473 (quite simply) the version 1 approach is highly brain-damaged and probably
476 --------------------------------
479 GNU DWARF Representation of GNU C Extensions to ANSI C
480 ------------------------------------------------------
482 The file dwarfout.c has been designed and implemented so as to provide
483 some reasonable DWARF representation for each and every declarative
484 construct which is accepted by the GNU C compiler. Since the GNU C
485 compiler accepts a superset of ANSI C, this means that there are some
486 cases in which the DWARF information produced by GCC must take some
487 liberties in improvising DWARF representations for declarations which
488 are only valid in (extended) GNU C.
490 In particular, GNU C provides at least three significant extensions to
491 ANSI C when it comes to declarations. These are (1) inline functions,
492 and (2) dynamic arrays, and (3) incomplete enum types. (See the GCC
493 manual for more information on these GNU extensions to ANSI C.) When
494 used, these GNU C extensions are represented (in the generated DWARF
495 output of GCC) in the most natural and intuitively obvious ways.
497 In the case of inline functions, the DWARF representation is exactly as
498 called for in the DWARF version 2 (draft) specification for an identical
499 function written in C++; i.e. we "reuse" the representation of inline
500 functions which has been defined for C++ to support this GNU C extension.
502 In the case of dynamic arrays, we use the most obvious representational
503 mechanism available; i.e. an array type in which the upper bound of
504 some dimension (usually the first and only dimension) is a variable
505 rather than a constant. (See the DWARF version 1 specification for more
508 In the case of incomplete enum types, such types are represented simply
509 as TAG_enumeration_type DIEs which DO NOT contain either AT_byte_size
510 attributes or AT_element_list attributes.
512 --------------------------------
518 The codes, formats, and other paraphernalia necessary to provide proper
519 support for symbolic debugging for the C++ language are still being worked
520 on by the UI/PLSIG. The vast majority of the additions to DWARF which will
521 be needed to completely support C++ have already been hashed out and agreed
522 upon, but a few small issues (e.g. anonymous unions, access declarations)
523 are still being discussed. Also, we in the PLSIG are still discussing
524 whether or not we need to do anything special for C++ templates. (At this
525 time it is not yet clear whether we even need to do anything special for
528 With regard to FORTRAN, the UI/PLSIG has defined what is believed to be a
529 complete and sufficient set of codes and rules for adequately representing
530 all of FORTRAN 77, and most of Fortran 90 in DWARF. While some support for
531 this has been implemented in dwarfout.c, further implementation and testing
534 GNU DWARF support for other languages (i.e. Pascal and Modula) is a moot
535 issue until there are GNU front-ends for these other languages.
537 As currently defined, DWARF only describes a (binary) language which can
538 be used to communicate symbolic debugging information from a compiler
539 through an assembler and a linker, to a debugger. There is no clear
540 specification of what processing should be (or must be) done by the
541 assembler and/or the linker. Fortunately, the role of the assembler
542 is easily inferred (by anyone knowledgeable about assemblers) just by
543 looking at examples of assembly-level DWARF code. Sadly though, the
544 allowable (or required) processing steps performed by a linker are
545 harder to infer and (perhaps) even harder to agree upon. There are
546 several forms of very useful `post-processing' steps which intelligent
547 linkers *could* (in theory) perform on object files containing DWARF,
548 but any and all such link-time transformations are currently both disallowed
551 In particular, possible link-time transformations of DWARF code which could
552 provide significant benefits include (but are not limited to):
554 Commonization of duplicate DIEs obtained from multiple input
557 Cross-compilation type checking based upon DWARF type information
558 for objects and functions.
560 Other possible `compacting' transformations designed to save disk
561 space and to reduce linker & debugger I/O activity.
567 #ifdef DWARF_DEBUGGING_INFO
573 #include "hard-reg-set.h"
574 #include "insn-config.h"
577 #include "dwarfout.h"
582 /* IMPORTANT NOTE: Please see the file README.DWARF for important details
583 regarding the GNU implementation of Dwarf. */
585 /* NOTE: In the comments in this file, many references are made to
586 so called "Debugging Information Entries". For the sake of brevity,
587 this term is abbreviated to `DIE' throughout the remainder of this
590 /* Note that the implementation of C++ support herein is (as yet) unfinished.
591 If you want to try to complete it, more power to you. */
593 /* How to start an assembler comment. */
594 #ifndef ASM_COMMENT_START
595 #define ASM_COMMENT_START ";#"
598 /* How to print out a register name. */
600 #define PRINT_REG(RTX, CODE, FILE) \
601 fprintf ((FILE), "%s", reg_names[REGNO (RTX)])
604 /* Define a macro which returns non-zero for any tagged type which is
605 used (directly or indirectly) in the specification of either some
606 function's return type or some formal parameter of some function.
607 We use this macro when we are operating in "terse" mode to help us
608 know what tagged types have to be represented in Dwarf (even in
609 terse mode) and which ones don't.
611 A flag bit with this meaning really should be a part of the normal
612 GCC ..._TYPE nodes, but at the moment, there is no such bit defined
613 for these nodes. For now, we have to just fake it. It it safe for
614 us to simply return zero for all complete tagged types (which will
615 get forced out anyway if they were used in the specification of some
616 formal or return type) and non-zero for all incomplete tagged types.
619 #define TYPE_USED_FOR_FUNCTION(tagged_type) (TYPE_SIZE (tagged_type) == 0)
621 /* Define a macro which returns non-zero for a TYPE_DECL which was
622 implicitly generated for a tagged type.
624 Note that unlike the gcc front end (which generates a NULL named
625 TYPE_DECL node for each complete tagged type, each array type, and
626 each function type node created) the g++ front end generates a
627 _named_ TYPE_DECL node for each tagged type node created.
628 These TYPE_DECLs have DECL_ARTIFICIAL set, so we know not to
629 generate a DW_TAG_typedef DIE for them. */
630 #define TYPE_DECL_IS_STUB(decl) \
631 (DECL_NAME (decl) == NULL \
632 || (DECL_ARTIFICIAL (decl) \
633 && is_tagged_type (TREE_TYPE (decl)) \
634 && decl == TYPE_STUB_DECL (TREE_TYPE (decl))))
636 extern int flag_traditional;
638 /* Maximum size (in bytes) of an artificially generated label. */
640 #define MAX_ARTIFICIAL_LABEL_BYTES 30
642 /* Structure to keep track of source filenames. */
644 struct filename_entry {
649 typedef struct filename_entry filename_entry;
651 /* Pointer to an array of elements, each one having the structure above. */
653 static filename_entry *filename_table;
655 /* Total number of entries in the table (i.e. array) pointed to by
656 `filename_table'. This is the *total* and includes both used and
659 static unsigned ft_entries_allocated;
661 /* Number of entries in the filename_table which are actually in use. */
663 static unsigned ft_entries;
665 /* Size (in elements) of increments by which we may expand the filename
666 table. Actually, a single hunk of space of this size should be enough
667 for most typical programs. */
669 #define FT_ENTRIES_INCREMENT 64
671 /* Local pointer to the name of the main input file. Initialized in
674 static const char *primary_filename;
676 /* Pointer to the most recent filename for which we produced some line info. */
678 static const char *last_filename;
680 /* Counter to generate unique names for DIEs. */
682 static unsigned next_unused_dienum = 1;
684 /* Number of the DIE which is currently being generated. */
686 static unsigned current_dienum;
688 /* Number to use for the special "pubname" label on the next DIE which
689 represents a function or data object defined in this compilation
690 unit which has "extern" linkage. */
692 static int next_pubname_number = 0;
694 #define NEXT_DIE_NUM pending_sibling_stack[pending_siblings-1]
696 /* Pointer to a dynamically allocated list of pre-reserved and still
697 pending sibling DIE numbers. Note that this list will grow as needed. */
699 static unsigned *pending_sibling_stack;
701 /* Counter to keep track of the number of pre-reserved and still pending
702 sibling DIE numbers. */
704 static unsigned pending_siblings;
706 /* The currently allocated size of the above list (expressed in number of
709 static unsigned pending_siblings_allocated;
711 /* Size (in elements) of increments by which we may expand the pending
712 sibling stack. Actually, a single hunk of space of this size should
713 be enough for most typical programs. */
715 #define PENDING_SIBLINGS_INCREMENT 64
717 /* Non-zero if we are performing our file-scope finalization pass and if
718 we should force out Dwarf descriptions of any and all file-scope
719 tagged types which are still incomplete types. */
721 static int finalizing = 0;
723 /* A pointer to the base of a list of pending types which we haven't
724 generated DIEs for yet, but which we will have to come back to
727 static tree *pending_types_list;
729 /* Number of elements currently allocated for the pending_types_list. */
731 static unsigned pending_types_allocated;
733 /* Number of elements of pending_types_list currently in use. */
735 static unsigned pending_types;
737 /* Size (in elements) of increments by which we may expand the pending
738 types list. Actually, a single hunk of space of this size should
739 be enough for most typical programs. */
741 #define PENDING_TYPES_INCREMENT 64
743 /* A pointer to the base of a list of incomplete types which might be
744 completed at some later time. */
746 static tree *incomplete_types_list;
748 /* Number of elements currently allocated for the incomplete_types_list. */
749 static unsigned incomplete_types_allocated;
751 /* Number of elements of incomplete_types_list currently in use. */
752 static unsigned incomplete_types;
754 /* Size (in elements) of increments by which we may expand the incomplete
755 types list. Actually, a single hunk of space of this size should
756 be enough for most typical programs. */
757 #define INCOMPLETE_TYPES_INCREMENT 64
759 /* Pointer to an artificial RECORD_TYPE which we create in dwarfout_init.
760 This is used in a hack to help us get the DIEs describing types of
761 formal parameters to come *after* all of the DIEs describing the formal
762 parameters themselves. That's necessary in order to be compatible
763 with what the brain-damaged svr4 SDB debugger requires. */
765 static tree fake_containing_scope;
767 /* The number of the current function definition that we are generating
768 debugging information for. These numbers range from 1 up to the maximum
769 number of function definitions contained within the current compilation
770 unit. These numbers are used to create unique labels for various things
771 contained within various function definitions. */
773 static unsigned current_funcdef_number = 1;
775 /* A pointer to the ..._DECL node which we have most recently been working
776 on. We keep this around just in case something about it looks screwy
777 and we want to tell the user what the source coordinates for the actual
780 static tree dwarf_last_decl;
782 /* A flag indicating that we are emitting the member declarations of a
783 class, so member functions and variables should not be entirely emitted.
784 This is a kludge to avoid passing a second argument to output_*_die. */
788 /* Forward declarations for functions defined in this file. */
790 static void dwarfout_init PARAMS ((const char *));
791 static void dwarfout_finish PARAMS ((const char *));
792 static void dwarfout_define PARAMS ((unsigned int, const char *));
793 static void dwarfout_undef PARAMS ((unsigned int, const char *));
794 static void dwarfout_start_source_file PARAMS ((unsigned, const char *));
795 static void dwarfout_start_source_file_check PARAMS ((unsigned, const char *));
796 static void dwarfout_end_source_file PARAMS ((unsigned));
797 static void dwarfout_end_source_file_check PARAMS ((unsigned));
798 static void dwarfout_begin_block PARAMS ((unsigned, unsigned));
799 static void dwarfout_end_block PARAMS ((unsigned, unsigned));
800 static void dwarfout_end_epilogue PARAMS ((void));
801 static void dwarfout_source_line PARAMS (( const char *, rtx));
802 static void dwarfout_end_function PARAMS ((unsigned int));
803 static const char *dwarf_tag_name PARAMS ((unsigned));
804 static const char *dwarf_attr_name PARAMS ((unsigned));
805 static const char *dwarf_stack_op_name PARAMS ((unsigned));
806 static const char *dwarf_typemod_name PARAMS ((unsigned));
807 static const char *dwarf_fmt_byte_name PARAMS ((unsigned));
808 static const char *dwarf_fund_type_name PARAMS ((unsigned));
809 static tree decl_ultimate_origin PARAMS ((tree));
810 static tree block_ultimate_origin PARAMS ((tree));
811 static tree decl_class_context PARAMS ((tree));
813 static void output_unsigned_leb128 PARAMS ((unsigned long));
814 static void output_signed_leb128 PARAMS ((long));
816 static int fundamental_type_code PARAMS ((tree));
817 static tree root_type_1 PARAMS ((tree, int));
818 static tree root_type PARAMS ((tree));
819 static void write_modifier_bytes_1 PARAMS ((tree, int, int, int));
820 static void write_modifier_bytes PARAMS ((tree, int, int));
821 static inline int type_is_fundamental PARAMS ((tree));
822 static void equate_decl_number_to_die_number PARAMS ((tree));
823 static inline void equate_type_number_to_die_number PARAMS ((tree));
824 static void output_reg_number PARAMS ((rtx));
825 static void output_mem_loc_descriptor PARAMS ((rtx));
826 static void output_loc_descriptor PARAMS ((rtx));
827 static void output_bound_representation PARAMS ((tree, unsigned, int));
828 static void output_enumeral_list PARAMS ((tree));
829 static inline HOST_WIDE_INT ceiling PARAMS ((HOST_WIDE_INT, unsigned int));
830 static inline tree field_type PARAMS ((tree));
831 static inline unsigned int simple_type_align_in_bits PARAMS ((tree));
832 static inline unsigned HOST_WIDE_INT simple_type_size_in_bits PARAMS ((tree));
833 static HOST_WIDE_INT field_byte_offset PARAMS ((tree));
834 static inline void sibling_attribute PARAMS ((void));
835 static void location_attribute PARAMS ((rtx));
836 static void data_member_location_attribute PARAMS ((tree));
837 static void const_value_attribute PARAMS ((rtx));
838 static void location_or_const_value_attribute PARAMS ((tree));
839 static inline void name_attribute PARAMS ((const char *));
840 static inline void fund_type_attribute PARAMS ((unsigned));
841 static void mod_fund_type_attribute PARAMS ((tree, int, int));
842 static inline void user_def_type_attribute PARAMS ((tree));
843 static void mod_u_d_type_attribute PARAMS ((tree, int, int));
844 #ifdef USE_ORDERING_ATTRIBUTE
845 static inline void ordering_attribute PARAMS ((unsigned));
846 #endif /* defined(USE_ORDERING_ATTRIBUTE) */
847 static void subscript_data_attribute PARAMS ((tree));
848 static void byte_size_attribute PARAMS ((tree));
849 static inline void bit_offset_attribute PARAMS ((tree));
850 static inline void bit_size_attribute PARAMS ((tree));
851 static inline void element_list_attribute PARAMS ((tree));
852 static inline void stmt_list_attribute PARAMS ((const char *));
853 static inline void low_pc_attribute PARAMS ((const char *));
854 static inline void high_pc_attribute PARAMS ((const char *));
855 static inline void body_begin_attribute PARAMS ((const char *));
856 static inline void body_end_attribute PARAMS ((const char *));
857 static inline void language_attribute PARAMS ((unsigned));
858 static inline void member_attribute PARAMS ((tree));
860 static inline void string_length_attribute PARAMS ((tree));
862 static inline void comp_dir_attribute PARAMS ((const char *));
863 static inline void sf_names_attribute PARAMS ((const char *));
864 static inline void src_info_attribute PARAMS ((const char *));
865 static inline void mac_info_attribute PARAMS ((const char *));
866 static inline void prototyped_attribute PARAMS ((tree));
867 static inline void producer_attribute PARAMS ((const char *));
868 static inline void inline_attribute PARAMS ((tree));
869 static inline void containing_type_attribute PARAMS ((tree));
870 static inline void abstract_origin_attribute PARAMS ((tree));
871 #ifdef DWARF_DECL_COORDINATES
872 static inline void src_coords_attribute PARAMS ((unsigned, unsigned));
873 #endif /* defined(DWARF_DECL_COORDINATES) */
874 static inline void pure_or_virtual_attribute PARAMS ((tree));
875 static void name_and_src_coords_attributes PARAMS ((tree));
876 static void type_attribute PARAMS ((tree, int, int));
877 static const char *type_tag PARAMS ((tree));
878 static inline void dienum_push PARAMS ((void));
879 static inline void dienum_pop PARAMS ((void));
880 static inline tree member_declared_type PARAMS ((tree));
881 static const char *function_start_label PARAMS ((tree));
882 static void output_array_type_die PARAMS ((void *));
883 static void output_set_type_die PARAMS ((void *));
885 static void output_entry_point_die PARAMS ((void *));
887 static void output_inlined_enumeration_type_die PARAMS ((void *));
888 static void output_inlined_structure_type_die PARAMS ((void *));
889 static void output_inlined_union_type_die PARAMS ((void *));
890 static void output_enumeration_type_die PARAMS ((void *));
891 static void output_formal_parameter_die PARAMS ((void *));
892 static void output_global_subroutine_die PARAMS ((void *));
893 static void output_global_variable_die PARAMS ((void *));
894 static void output_label_die PARAMS ((void *));
895 static void output_lexical_block_die PARAMS ((void *));
896 static void output_inlined_subroutine_die PARAMS ((void *));
897 static void output_local_variable_die PARAMS ((void *));
898 static void output_member_die PARAMS ((void *));
900 static void output_pointer_type_die PARAMS ((void *));
901 static void output_reference_type_die PARAMS ((void *));
903 static void output_ptr_to_mbr_type_die PARAMS ((void *));
904 static void output_compile_unit_die PARAMS ((void *));
905 static void output_string_type_die PARAMS ((void *));
906 static void output_inheritance_die PARAMS ((void *));
907 static void output_structure_type_die PARAMS ((void *));
908 static void output_local_subroutine_die PARAMS ((void *));
909 static void output_subroutine_type_die PARAMS ((void *));
910 static void output_typedef_die PARAMS ((void *));
911 static void output_union_type_die PARAMS ((void *));
912 static void output_unspecified_parameters_die PARAMS ((void *));
913 static void output_padded_null_die PARAMS ((void *));
914 static void output_die PARAMS ((void (*)(void *), void *));
915 static void end_sibling_chain PARAMS ((void));
916 static void output_formal_types PARAMS ((tree));
917 static void pend_type PARAMS ((tree));
918 static int type_ok_for_scope PARAMS ((tree, tree));
919 static void output_pending_types_for_scope PARAMS ((tree));
920 static void output_type PARAMS ((tree, tree));
921 static void output_tagged_type_instantiation PARAMS ((tree));
922 static void output_block PARAMS ((tree, int));
923 static void output_decls_for_scope PARAMS ((tree, int));
924 static void output_decl PARAMS ((tree, tree));
925 static void shuffle_filename_entry PARAMS ((filename_entry *));
926 static void generate_new_sfname_entry PARAMS ((void));
927 static unsigned lookup_filename PARAMS ((const char *));
928 static void generate_srcinfo_entry PARAMS ((unsigned, unsigned));
929 static void generate_macinfo_entry PARAMS ((const char *, const char *));
930 static int is_pseudo_reg PARAMS ((rtx));
931 static tree type_main_variant PARAMS ((tree));
932 static int is_tagged_type PARAMS ((tree));
933 static int is_redundant_typedef PARAMS ((tree));
934 static void add_incomplete_type PARAMS ((tree));
935 static void retry_incomplete_types PARAMS ((void));
937 /* Definitions of defaults for assembler-dependent names of various
938 pseudo-ops and section names.
940 Theses may be overridden in your tm.h file (if necessary) for your
941 particular assembler. The default values provided here correspond to
942 what is expected by "standard" AT&T System V.4 assemblers. */
945 #define FILE_ASM_OP "\t.file\t"
947 #ifndef VERSION_ASM_OP
948 #define VERSION_ASM_OP "\t.version\t"
950 #ifndef UNALIGNED_SHORT_ASM_OP
951 #define UNALIGNED_SHORT_ASM_OP "\t.2byte\t"
953 #ifndef UNALIGNED_INT_ASM_OP
954 #define UNALIGNED_INT_ASM_OP "\t.4byte\t"
957 #define ASM_BYTE_OP "\t.byte\t"
960 #define SET_ASM_OP "\t.set\t"
963 /* Pseudo-ops for pushing the current section onto the section stack (and
964 simultaneously changing to a new section) and for poping back to the
965 section we were in immediately before this one. Note that most svr4
966 assemblers only maintain a one level stack... you can push all the
967 sections you want, but you can only pop out one level. (The sparc
968 svr4 assembler is an exception to this general rule.) That's
969 OK because we only use at most one level of the section stack herein. */
971 #ifndef PUSHSECTION_ASM_OP
972 #define PUSHSECTION_ASM_OP "\t.section\t"
974 #ifndef POPSECTION_ASM_OP
975 #define POPSECTION_ASM_OP "\t.previous"
978 /* The default format used by the ASM_OUTPUT_PUSH_SECTION macro (see below)
979 to print the PUSHSECTION_ASM_OP and the section name. The default here
980 works for almost all svr4 assemblers, except for the sparc, where the
981 section name must be enclosed in double quotes. (See sparcv4.h.) */
983 #ifndef PUSHSECTION_FORMAT
984 #define PUSHSECTION_FORMAT "%s%s\n"
987 #ifndef DEBUG_SECTION
988 #define DEBUG_SECTION ".debug"
991 #define LINE_SECTION ".line"
993 #ifndef DEBUG_SFNAMES_SECTION
994 #define DEBUG_SFNAMES_SECTION ".debug_sfnames"
996 #ifndef DEBUG_SRCINFO_SECTION
997 #define DEBUG_SRCINFO_SECTION ".debug_srcinfo"
999 #ifndef DEBUG_MACINFO_SECTION
1000 #define DEBUG_MACINFO_SECTION ".debug_macinfo"
1002 #ifndef DEBUG_PUBNAMES_SECTION
1003 #define DEBUG_PUBNAMES_SECTION ".debug_pubnames"
1005 #ifndef DEBUG_ARANGES_SECTION
1006 #define DEBUG_ARANGES_SECTION ".debug_aranges"
1008 #ifndef TEXT_SECTION
1009 #define TEXT_SECTION ".text"
1011 #ifndef DATA_SECTION
1012 #define DATA_SECTION ".data"
1014 #ifndef DATA1_SECTION
1015 #define DATA1_SECTION ".data1"
1017 #ifndef RODATA_SECTION
1018 #define RODATA_SECTION ".rodata"
1020 #ifndef RODATA1_SECTION
1021 #define RODATA1_SECTION ".rodata1"
1024 #define BSS_SECTION ".bss"
1027 /* Definitions of defaults for formats and names of various special
1028 (artificial) labels which may be generated within this file (when
1029 the -g options is used and DWARF_DEBUGGING_INFO is in effect.
1031 If necessary, these may be overridden from within your tm.h file,
1032 but typically, you should never need to override these.
1034 These labels have been hacked (temporarily) so that they all begin with
1035 a `.L' sequence so as to appease the stock sparc/svr4 assembler and the
1036 stock m88k/svr4 assembler, both of which need to see .L at the start of
1037 a label in order to prevent that label from going into the linker symbol
1038 table). When I get time, I'll have to fix this the right way so that we
1039 will use ASM_GENERATE_INTERNAL_LABEL and ASM_OUTPUT_INTERNAL_LABEL herein,
1040 but that will require a rather massive set of changes. For the moment,
1041 the following definitions out to produce the right results for all svr4
1042 and svr3 assemblers. -- rfg
1045 #ifndef TEXT_BEGIN_LABEL
1046 #define TEXT_BEGIN_LABEL "*.L_text_b"
1048 #ifndef TEXT_END_LABEL
1049 #define TEXT_END_LABEL "*.L_text_e"
1052 #ifndef DATA_BEGIN_LABEL
1053 #define DATA_BEGIN_LABEL "*.L_data_b"
1055 #ifndef DATA_END_LABEL
1056 #define DATA_END_LABEL "*.L_data_e"
1059 #ifndef DATA1_BEGIN_LABEL
1060 #define DATA1_BEGIN_LABEL "*.L_data1_b"
1062 #ifndef DATA1_END_LABEL
1063 #define DATA1_END_LABEL "*.L_data1_e"
1066 #ifndef RODATA_BEGIN_LABEL
1067 #define RODATA_BEGIN_LABEL "*.L_rodata_b"
1069 #ifndef RODATA_END_LABEL
1070 #define RODATA_END_LABEL "*.L_rodata_e"
1073 #ifndef RODATA1_BEGIN_LABEL
1074 #define RODATA1_BEGIN_LABEL "*.L_rodata1_b"
1076 #ifndef RODATA1_END_LABEL
1077 #define RODATA1_END_LABEL "*.L_rodata1_e"
1080 #ifndef BSS_BEGIN_LABEL
1081 #define BSS_BEGIN_LABEL "*.L_bss_b"
1083 #ifndef BSS_END_LABEL
1084 #define BSS_END_LABEL "*.L_bss_e"
1087 #ifndef LINE_BEGIN_LABEL
1088 #define LINE_BEGIN_LABEL "*.L_line_b"
1090 #ifndef LINE_LAST_ENTRY_LABEL
1091 #define LINE_LAST_ENTRY_LABEL "*.L_line_last"
1093 #ifndef LINE_END_LABEL
1094 #define LINE_END_LABEL "*.L_line_e"
1097 #ifndef DEBUG_BEGIN_LABEL
1098 #define DEBUG_BEGIN_LABEL "*.L_debug_b"
1100 #ifndef SFNAMES_BEGIN_LABEL
1101 #define SFNAMES_BEGIN_LABEL "*.L_sfnames_b"
1103 #ifndef SRCINFO_BEGIN_LABEL
1104 #define SRCINFO_BEGIN_LABEL "*.L_srcinfo_b"
1106 #ifndef MACINFO_BEGIN_LABEL
1107 #define MACINFO_BEGIN_LABEL "*.L_macinfo_b"
1110 #ifndef DEBUG_ARANGES_BEGIN_LABEL
1111 #define DEBUG_ARANGES_BEGIN_LABEL "*.L_debug_aranges_begin"
1113 #ifndef DEBUG_ARANGES_END_LABEL
1114 #define DEBUG_ARANGES_END_LABEL "*.L_debug_aranges_end"
1117 #ifndef DIE_BEGIN_LABEL_FMT
1118 #define DIE_BEGIN_LABEL_FMT "*.L_D%u"
1120 #ifndef DIE_END_LABEL_FMT
1121 #define DIE_END_LABEL_FMT "*.L_D%u_e"
1123 #ifndef PUB_DIE_LABEL_FMT
1124 #define PUB_DIE_LABEL_FMT "*.L_P%u"
1126 #ifndef BLOCK_BEGIN_LABEL_FMT
1127 #define BLOCK_BEGIN_LABEL_FMT "*.L_B%u"
1129 #ifndef BLOCK_END_LABEL_FMT
1130 #define BLOCK_END_LABEL_FMT "*.L_B%u_e"
1132 #ifndef SS_BEGIN_LABEL_FMT
1133 #define SS_BEGIN_LABEL_FMT "*.L_s%u"
1135 #ifndef SS_END_LABEL_FMT
1136 #define SS_END_LABEL_FMT "*.L_s%u_e"
1138 #ifndef EE_BEGIN_LABEL_FMT
1139 #define EE_BEGIN_LABEL_FMT "*.L_e%u"
1141 #ifndef EE_END_LABEL_FMT
1142 #define EE_END_LABEL_FMT "*.L_e%u_e"
1144 #ifndef MT_BEGIN_LABEL_FMT
1145 #define MT_BEGIN_LABEL_FMT "*.L_t%u"
1147 #ifndef MT_END_LABEL_FMT
1148 #define MT_END_LABEL_FMT "*.L_t%u_e"
1150 #ifndef LOC_BEGIN_LABEL_FMT
1151 #define LOC_BEGIN_LABEL_FMT "*.L_l%u"
1153 #ifndef LOC_END_LABEL_FMT
1154 #define LOC_END_LABEL_FMT "*.L_l%u_e"
1156 #ifndef BOUND_BEGIN_LABEL_FMT
1157 #define BOUND_BEGIN_LABEL_FMT "*.L_b%u_%u_%c"
1159 #ifndef BOUND_END_LABEL_FMT
1160 #define BOUND_END_LABEL_FMT "*.L_b%u_%u_%c_e"
1162 #ifndef DERIV_BEGIN_LABEL_FMT
1163 #define DERIV_BEGIN_LABEL_FMT "*.L_d%u"
1165 #ifndef DERIV_END_LABEL_FMT
1166 #define DERIV_END_LABEL_FMT "*.L_d%u_e"
1168 #ifndef SL_BEGIN_LABEL_FMT
1169 #define SL_BEGIN_LABEL_FMT "*.L_sl%u"
1171 #ifndef SL_END_LABEL_FMT
1172 #define SL_END_LABEL_FMT "*.L_sl%u_e"
1174 #ifndef BODY_BEGIN_LABEL_FMT
1175 #define BODY_BEGIN_LABEL_FMT "*.L_b%u"
1177 #ifndef BODY_END_LABEL_FMT
1178 #define BODY_END_LABEL_FMT "*.L_b%u_e"
1180 #ifndef FUNC_END_LABEL_FMT
1181 #define FUNC_END_LABEL_FMT "*.L_f%u_e"
1183 #ifndef TYPE_NAME_FMT
1184 #define TYPE_NAME_FMT "*.L_T%u"
1186 #ifndef DECL_NAME_FMT
1187 #define DECL_NAME_FMT "*.L_E%u"
1189 #ifndef LINE_CODE_LABEL_FMT
1190 #define LINE_CODE_LABEL_FMT "*.L_LC%u"
1192 #ifndef SFNAMES_ENTRY_LABEL_FMT
1193 #define SFNAMES_ENTRY_LABEL_FMT "*.L_F%u"
1195 #ifndef LINE_ENTRY_LABEL_FMT
1196 #define LINE_ENTRY_LABEL_FMT "*.L_LE%u"
1199 /* Definitions of defaults for various types of primitive assembly language
1202 If necessary, these may be overridden from within your tm.h file,
1203 but typically, you shouldn't need to override these. */
1205 #ifndef ASM_OUTPUT_PUSH_SECTION
1206 #define ASM_OUTPUT_PUSH_SECTION(FILE, SECTION) \
1207 fprintf ((FILE), PUSHSECTION_FORMAT, PUSHSECTION_ASM_OP, SECTION)
1210 #ifndef ASM_OUTPUT_POP_SECTION
1211 #define ASM_OUTPUT_POP_SECTION(FILE) \
1212 fprintf ((FILE), "%s\n", POPSECTION_ASM_OP)
1215 #ifndef ASM_OUTPUT_DWARF_DELTA2
1216 #define ASM_OUTPUT_DWARF_DELTA2(FILE,LABEL1,LABEL2) \
1217 do { fprintf ((FILE), "%s", UNALIGNED_SHORT_ASM_OP); \
1218 assemble_name (FILE, LABEL1); \
1219 fprintf (FILE, "-"); \
1220 assemble_name (FILE, LABEL2); \
1221 fprintf (FILE, "\n"); \
1225 #ifndef ASM_OUTPUT_DWARF_DELTA4
1226 #define ASM_OUTPUT_DWARF_DELTA4(FILE,LABEL1,LABEL2) \
1227 do { fprintf ((FILE), "%s", UNALIGNED_INT_ASM_OP); \
1228 assemble_name (FILE, LABEL1); \
1229 fprintf (FILE, "-"); \
1230 assemble_name (FILE, LABEL2); \
1231 fprintf (FILE, "\n"); \
1235 #ifndef ASM_OUTPUT_DWARF_TAG
1236 #define ASM_OUTPUT_DWARF_TAG(FILE,TAG) \
1238 fprintf ((FILE), "%s0x%x", \
1239 UNALIGNED_SHORT_ASM_OP, (unsigned) TAG); \
1240 if (flag_debug_asm) \
1241 fprintf ((FILE), "\t%s %s", \
1242 ASM_COMMENT_START, dwarf_tag_name (TAG)); \
1243 fputc ('\n', (FILE)); \
1247 #ifndef ASM_OUTPUT_DWARF_ATTRIBUTE
1248 #define ASM_OUTPUT_DWARF_ATTRIBUTE(FILE,ATTR) \
1250 fprintf ((FILE), "%s0x%x", \
1251 UNALIGNED_SHORT_ASM_OP, (unsigned) ATTR); \
1252 if (flag_debug_asm) \
1253 fprintf ((FILE), "\t%s %s", \
1254 ASM_COMMENT_START, dwarf_attr_name (ATTR)); \
1255 fputc ('\n', (FILE)); \
1259 #ifndef ASM_OUTPUT_DWARF_STACK_OP
1260 #define ASM_OUTPUT_DWARF_STACK_OP(FILE,OP) \
1262 fprintf ((FILE), "%s0x%x", ASM_BYTE_OP, (unsigned) OP); \
1263 if (flag_debug_asm) \
1264 fprintf ((FILE), "\t%s %s", \
1265 ASM_COMMENT_START, dwarf_stack_op_name (OP)); \
1266 fputc ('\n', (FILE)); \
1270 #ifndef ASM_OUTPUT_DWARF_FUND_TYPE
1271 #define ASM_OUTPUT_DWARF_FUND_TYPE(FILE,FT) \
1273 fprintf ((FILE), "%s0x%x", \
1274 UNALIGNED_SHORT_ASM_OP, (unsigned) FT); \
1275 if (flag_debug_asm) \
1276 fprintf ((FILE), "\t%s %s", \
1277 ASM_COMMENT_START, dwarf_fund_type_name (FT)); \
1278 fputc ('\n', (FILE)); \
1282 #ifndef ASM_OUTPUT_DWARF_FMT_BYTE
1283 #define ASM_OUTPUT_DWARF_FMT_BYTE(FILE,FMT) \
1285 fprintf ((FILE), "%s0x%x", ASM_BYTE_OP, (unsigned) FMT); \
1286 if (flag_debug_asm) \
1287 fprintf ((FILE), "\t%s %s", \
1288 ASM_COMMENT_START, dwarf_fmt_byte_name (FMT)); \
1289 fputc ('\n', (FILE)); \
1293 #ifndef ASM_OUTPUT_DWARF_TYPE_MODIFIER
1294 #define ASM_OUTPUT_DWARF_TYPE_MODIFIER(FILE,MOD) \
1296 fprintf ((FILE), "%s0x%x", ASM_BYTE_OP, (unsigned) MOD); \
1297 if (flag_debug_asm) \
1298 fprintf ((FILE), "\t%s %s", \
1299 ASM_COMMENT_START, dwarf_typemod_name (MOD)); \
1300 fputc ('\n', (FILE)); \
1304 #ifndef ASM_OUTPUT_DWARF_ADDR
1305 #define ASM_OUTPUT_DWARF_ADDR(FILE,LABEL) \
1306 do { fprintf ((FILE), "%s", UNALIGNED_INT_ASM_OP); \
1307 assemble_name (FILE, LABEL); \
1308 fprintf (FILE, "\n"); \
1312 #ifndef ASM_OUTPUT_DWARF_ADDR_CONST
1313 #define ASM_OUTPUT_DWARF_ADDR_CONST(FILE,RTX) \
1315 fprintf ((FILE), "%s", UNALIGNED_INT_ASM_OP); \
1316 output_addr_const ((FILE), (RTX)); \
1317 fputc ('\n', (FILE)); \
1321 #ifndef ASM_OUTPUT_DWARF_REF
1322 #define ASM_OUTPUT_DWARF_REF(FILE,LABEL) \
1323 do { fprintf ((FILE), "%s", UNALIGNED_INT_ASM_OP); \
1324 assemble_name (FILE, LABEL); \
1325 fprintf (FILE, "\n"); \
1329 #ifndef ASM_OUTPUT_DWARF_DATA1
1330 #define ASM_OUTPUT_DWARF_DATA1(FILE,VALUE) \
1331 fprintf ((FILE), "%s0x%x\n", ASM_BYTE_OP, VALUE)
1334 #ifndef ASM_OUTPUT_DWARF_DATA2
1335 #define ASM_OUTPUT_DWARF_DATA2(FILE,VALUE) \
1336 fprintf ((FILE), "%s0x%x\n", UNALIGNED_SHORT_ASM_OP, (unsigned) VALUE)
1339 #ifndef ASM_OUTPUT_DWARF_DATA4
1340 #define ASM_OUTPUT_DWARF_DATA4(FILE,VALUE) \
1341 fprintf ((FILE), "%s0x%x\n", UNALIGNED_INT_ASM_OP, (unsigned) VALUE)
1344 #ifndef ASM_OUTPUT_DWARF_DATA8
1345 #define ASM_OUTPUT_DWARF_DATA8(FILE,HIGH_VALUE,LOW_VALUE) \
1347 if (WORDS_BIG_ENDIAN) \
1349 fprintf ((FILE), "%s0x%x\n", UNALIGNED_INT_ASM_OP, HIGH_VALUE); \
1350 fprintf ((FILE), "%s0x%x\n", UNALIGNED_INT_ASM_OP, LOW_VALUE); \
1354 fprintf ((FILE), "%s0x%x\n", UNALIGNED_INT_ASM_OP, LOW_VALUE); \
1355 fprintf ((FILE), "%s0x%x\n", UNALIGNED_INT_ASM_OP, HIGH_VALUE); \
1360 /* ASM_OUTPUT_DWARF_STRING is defined to output an ascii string, but to
1361 NOT issue a trailing newline. We define ASM_OUTPUT_DWARF_STRING_NEWLINE
1362 based on whether ASM_OUTPUT_DWARF_STRING is defined or not. If it is
1363 defined, we call it, then issue the line feed. If not, we supply a
1364 default defintion of calling ASM_OUTPUT_ASCII */
1366 #ifndef ASM_OUTPUT_DWARF_STRING
1367 #define ASM_OUTPUT_DWARF_STRING_NEWLINE(FILE,P) \
1368 ASM_OUTPUT_ASCII ((FILE), P, strlen (P)+1)
1370 #define ASM_OUTPUT_DWARF_STRING_NEWLINE(FILE,P) \
1371 ASM_OUTPUT_DWARF_STRING (FILE,P), ASM_OUTPUT_DWARF_STRING (FILE,"\n")
1375 /* The debug hooks structure. */
1376 struct gcc_debug_hooks dwarf_debug_hooks =
1382 dwarfout_start_source_file_check,
1383 dwarfout_end_source_file_check,
1384 dwarfout_begin_block,
1386 dwarfout_source_line,
1387 dwarfout_end_epilogue,
1388 dwarfout_end_function
1391 /************************ general utility functions **************************/
1397 return (((GET_CODE (rtl) == REG) && (REGNO (rtl) >= FIRST_PSEUDO_REGISTER))
1398 || ((GET_CODE (rtl) == SUBREG)
1399 && (REGNO (SUBREG_REG (rtl)) >= FIRST_PSEUDO_REGISTER)));
1403 type_main_variant (type)
1406 type = TYPE_MAIN_VARIANT (type);
1408 /* There really should be only one main variant among any group of variants
1409 of a given type (and all of the MAIN_VARIANT values for all members of
1410 the group should point to that one type) but sometimes the C front-end
1411 messes this up for array types, so we work around that bug here. */
1413 if (TREE_CODE (type) == ARRAY_TYPE)
1415 while (type != TYPE_MAIN_VARIANT (type))
1416 type = TYPE_MAIN_VARIANT (type);
1422 /* Return non-zero if the given type node represents a tagged type. */
1425 is_tagged_type (type)
1428 register enum tree_code code = TREE_CODE (type);
1430 return (code == RECORD_TYPE || code == UNION_TYPE
1431 || code == QUAL_UNION_TYPE || code == ENUMERAL_TYPE);
1435 dwarf_tag_name (tag)
1436 register unsigned tag;
1440 case TAG_padding: return "TAG_padding";
1441 case TAG_array_type: return "TAG_array_type";
1442 case TAG_class_type: return "TAG_class_type";
1443 case TAG_entry_point: return "TAG_entry_point";
1444 case TAG_enumeration_type: return "TAG_enumeration_type";
1445 case TAG_formal_parameter: return "TAG_formal_parameter";
1446 case TAG_global_subroutine: return "TAG_global_subroutine";
1447 case TAG_global_variable: return "TAG_global_variable";
1448 case TAG_label: return "TAG_label";
1449 case TAG_lexical_block: return "TAG_lexical_block";
1450 case TAG_local_variable: return "TAG_local_variable";
1451 case TAG_member: return "TAG_member";
1452 case TAG_pointer_type: return "TAG_pointer_type";
1453 case TAG_reference_type: return "TAG_reference_type";
1454 case TAG_compile_unit: return "TAG_compile_unit";
1455 case TAG_string_type: return "TAG_string_type";
1456 case TAG_structure_type: return "TAG_structure_type";
1457 case TAG_subroutine: return "TAG_subroutine";
1458 case TAG_subroutine_type: return "TAG_subroutine_type";
1459 case TAG_typedef: return "TAG_typedef";
1460 case TAG_union_type: return "TAG_union_type";
1461 case TAG_unspecified_parameters: return "TAG_unspecified_parameters";
1462 case TAG_variant: return "TAG_variant";
1463 case TAG_common_block: return "TAG_common_block";
1464 case TAG_common_inclusion: return "TAG_common_inclusion";
1465 case TAG_inheritance: return "TAG_inheritance";
1466 case TAG_inlined_subroutine: return "TAG_inlined_subroutine";
1467 case TAG_module: return "TAG_module";
1468 case TAG_ptr_to_member_type: return "TAG_ptr_to_member_type";
1469 case TAG_set_type: return "TAG_set_type";
1470 case TAG_subrange_type: return "TAG_subrange_type";
1471 case TAG_with_stmt: return "TAG_with_stmt";
1473 /* GNU extensions. */
1475 case TAG_format_label: return "TAG_format_label";
1476 case TAG_namelist: return "TAG_namelist";
1477 case TAG_function_template: return "TAG_function_template";
1478 case TAG_class_template: return "TAG_class_template";
1480 default: return "TAG_<unknown>";
1485 dwarf_attr_name (attr)
1486 register unsigned attr;
1490 case AT_sibling: return "AT_sibling";
1491 case AT_location: return "AT_location";
1492 case AT_name: return "AT_name";
1493 case AT_fund_type: return "AT_fund_type";
1494 case AT_mod_fund_type: return "AT_mod_fund_type";
1495 case AT_user_def_type: return "AT_user_def_type";
1496 case AT_mod_u_d_type: return "AT_mod_u_d_type";
1497 case AT_ordering: return "AT_ordering";
1498 case AT_subscr_data: return "AT_subscr_data";
1499 case AT_byte_size: return "AT_byte_size";
1500 case AT_bit_offset: return "AT_bit_offset";
1501 case AT_bit_size: return "AT_bit_size";
1502 case AT_element_list: return "AT_element_list";
1503 case AT_stmt_list: return "AT_stmt_list";
1504 case AT_low_pc: return "AT_low_pc";
1505 case AT_high_pc: return "AT_high_pc";
1506 case AT_language: return "AT_language";
1507 case AT_member: return "AT_member";
1508 case AT_discr: return "AT_discr";
1509 case AT_discr_value: return "AT_discr_value";
1510 case AT_string_length: return "AT_string_length";
1511 case AT_common_reference: return "AT_common_reference";
1512 case AT_comp_dir: return "AT_comp_dir";
1513 case AT_const_value_string: return "AT_const_value_string";
1514 case AT_const_value_data2: return "AT_const_value_data2";
1515 case AT_const_value_data4: return "AT_const_value_data4";
1516 case AT_const_value_data8: return "AT_const_value_data8";
1517 case AT_const_value_block2: return "AT_const_value_block2";
1518 case AT_const_value_block4: return "AT_const_value_block4";
1519 case AT_containing_type: return "AT_containing_type";
1520 case AT_default_value_addr: return "AT_default_value_addr";
1521 case AT_default_value_data2: return "AT_default_value_data2";
1522 case AT_default_value_data4: return "AT_default_value_data4";
1523 case AT_default_value_data8: return "AT_default_value_data8";
1524 case AT_default_value_string: return "AT_default_value_string";
1525 case AT_friends: return "AT_friends";
1526 case AT_inline: return "AT_inline";
1527 case AT_is_optional: return "AT_is_optional";
1528 case AT_lower_bound_ref: return "AT_lower_bound_ref";
1529 case AT_lower_bound_data2: return "AT_lower_bound_data2";
1530 case AT_lower_bound_data4: return "AT_lower_bound_data4";
1531 case AT_lower_bound_data8: return "AT_lower_bound_data8";
1532 case AT_private: return "AT_private";
1533 case AT_producer: return "AT_producer";
1534 case AT_program: return "AT_program";
1535 case AT_protected: return "AT_protected";
1536 case AT_prototyped: return "AT_prototyped";
1537 case AT_public: return "AT_public";
1538 case AT_pure_virtual: return "AT_pure_virtual";
1539 case AT_return_addr: return "AT_return_addr";
1540 case AT_abstract_origin: return "AT_abstract_origin";
1541 case AT_start_scope: return "AT_start_scope";
1542 case AT_stride_size: return "AT_stride_size";
1543 case AT_upper_bound_ref: return "AT_upper_bound_ref";
1544 case AT_upper_bound_data2: return "AT_upper_bound_data2";
1545 case AT_upper_bound_data4: return "AT_upper_bound_data4";
1546 case AT_upper_bound_data8: return "AT_upper_bound_data8";
1547 case AT_virtual: return "AT_virtual";
1549 /* GNU extensions */
1551 case AT_sf_names: return "AT_sf_names";
1552 case AT_src_info: return "AT_src_info";
1553 case AT_mac_info: return "AT_mac_info";
1554 case AT_src_coords: return "AT_src_coords";
1555 case AT_body_begin: return "AT_body_begin";
1556 case AT_body_end: return "AT_body_end";
1558 default: return "AT_<unknown>";
1563 dwarf_stack_op_name (op)
1564 register unsigned op;
1568 case OP_REG: return "OP_REG";
1569 case OP_BASEREG: return "OP_BASEREG";
1570 case OP_ADDR: return "OP_ADDR";
1571 case OP_CONST: return "OP_CONST";
1572 case OP_DEREF2: return "OP_DEREF2";
1573 case OP_DEREF4: return "OP_DEREF4";
1574 case OP_ADD: return "OP_ADD";
1575 default: return "OP_<unknown>";
1580 dwarf_typemod_name (mod)
1581 register unsigned mod;
1585 case MOD_pointer_to: return "MOD_pointer_to";
1586 case MOD_reference_to: return "MOD_reference_to";
1587 case MOD_const: return "MOD_const";
1588 case MOD_volatile: return "MOD_volatile";
1589 default: return "MOD_<unknown>";
1594 dwarf_fmt_byte_name (fmt)
1595 register unsigned fmt;
1599 case FMT_FT_C_C: return "FMT_FT_C_C";
1600 case FMT_FT_C_X: return "FMT_FT_C_X";
1601 case FMT_FT_X_C: return "FMT_FT_X_C";
1602 case FMT_FT_X_X: return "FMT_FT_X_X";
1603 case FMT_UT_C_C: return "FMT_UT_C_C";
1604 case FMT_UT_C_X: return "FMT_UT_C_X";
1605 case FMT_UT_X_C: return "FMT_UT_X_C";
1606 case FMT_UT_X_X: return "FMT_UT_X_X";
1607 case FMT_ET: return "FMT_ET";
1608 default: return "FMT_<unknown>";
1613 dwarf_fund_type_name (ft)
1614 register unsigned ft;
1618 case FT_char: return "FT_char";
1619 case FT_signed_char: return "FT_signed_char";
1620 case FT_unsigned_char: return "FT_unsigned_char";
1621 case FT_short: return "FT_short";
1622 case FT_signed_short: return "FT_signed_short";
1623 case FT_unsigned_short: return "FT_unsigned_short";
1624 case FT_integer: return "FT_integer";
1625 case FT_signed_integer: return "FT_signed_integer";
1626 case FT_unsigned_integer: return "FT_unsigned_integer";
1627 case FT_long: return "FT_long";
1628 case FT_signed_long: return "FT_signed_long";
1629 case FT_unsigned_long: return "FT_unsigned_long";
1630 case FT_pointer: return "FT_pointer";
1631 case FT_float: return "FT_float";
1632 case FT_dbl_prec_float: return "FT_dbl_prec_float";
1633 case FT_ext_prec_float: return "FT_ext_prec_float";
1634 case FT_complex: return "FT_complex";
1635 case FT_dbl_prec_complex: return "FT_dbl_prec_complex";
1636 case FT_void: return "FT_void";
1637 case FT_boolean: return "FT_boolean";
1638 case FT_ext_prec_complex: return "FT_ext_prec_complex";
1639 case FT_label: return "FT_label";
1641 /* GNU extensions. */
1643 case FT_long_long: return "FT_long_long";
1644 case FT_signed_long_long: return "FT_signed_long_long";
1645 case FT_unsigned_long_long: return "FT_unsigned_long_long";
1647 case FT_int8: return "FT_int8";
1648 case FT_signed_int8: return "FT_signed_int8";
1649 case FT_unsigned_int8: return "FT_unsigned_int8";
1650 case FT_int16: return "FT_int16";
1651 case FT_signed_int16: return "FT_signed_int16";
1652 case FT_unsigned_int16: return "FT_unsigned_int16";
1653 case FT_int32: return "FT_int32";
1654 case FT_signed_int32: return "FT_signed_int32";
1655 case FT_unsigned_int32: return "FT_unsigned_int32";
1656 case FT_int64: return "FT_int64";
1657 case FT_signed_int64: return "FT_signed_int64";
1658 case FT_unsigned_int64: return "FT_unsigned_int64";
1659 case FT_int128: return "FT_int128";
1660 case FT_signed_int128: return "FT_signed_int128";
1661 case FT_unsigned_int128: return "FT_unsigned_int128";
1663 case FT_real32: return "FT_real32";
1664 case FT_real64: return "FT_real64";
1665 case FT_real96: return "FT_real96";
1666 case FT_real128: return "FT_real128";
1668 default: return "FT_<unknown>";
1672 /* Determine the "ultimate origin" of a decl. The decl may be an
1673 inlined instance of an inlined instance of a decl which is local
1674 to an inline function, so we have to trace all of the way back
1675 through the origin chain to find out what sort of node actually
1676 served as the original seed for the given block. */
1679 decl_ultimate_origin (decl)
1682 #ifdef ENABLE_CHECKING
1683 if (DECL_FROM_INLINE (DECL_ORIGIN (decl)))
1684 /* Since the DECL_ABSTRACT_ORIGIN for a DECL is supposed to be the
1685 most distant ancestor, this should never happen. */
1689 return DECL_ABSTRACT_ORIGIN (decl);
1692 /* Determine the "ultimate origin" of a block. The block may be an
1693 inlined instance of an inlined instance of a block which is local
1694 to an inline function, so we have to trace all of the way back
1695 through the origin chain to find out what sort of node actually
1696 served as the original seed for the given block. */
1699 block_ultimate_origin (block)
1700 register tree block;
1702 register tree immediate_origin = BLOCK_ABSTRACT_ORIGIN (block);
1704 if (immediate_origin == NULL)
1708 register tree ret_val;
1709 register tree lookahead = immediate_origin;
1713 ret_val = lookahead;
1714 lookahead = (TREE_CODE (ret_val) == BLOCK)
1715 ? BLOCK_ABSTRACT_ORIGIN (ret_val)
1718 while (lookahead != NULL && lookahead != ret_val);
1723 /* Get the class to which DECL belongs, if any. In g++, the DECL_CONTEXT
1724 of a virtual function may refer to a base class, so we check the 'this'
1728 decl_class_context (decl)
1731 tree context = NULL_TREE;
1732 if (TREE_CODE (decl) != FUNCTION_DECL || ! DECL_VINDEX (decl))
1733 context = DECL_CONTEXT (decl);
1735 context = TYPE_MAIN_VARIANT
1736 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))));
1738 if (context && !TYPE_P (context))
1739 context = NULL_TREE;
1746 output_unsigned_leb128 (value)
1747 register unsigned long value;
1749 register unsigned long orig_value = value;
1753 register unsigned byte = (value & 0x7f);
1756 if (value != 0) /* more bytes to follow */
1758 fprintf (asm_out_file, "%s0x%x", ASM_BYTE_OP, (unsigned) byte);
1759 if (flag_debug_asm && value == 0)
1760 fprintf (asm_out_file, "\t%s ULEB128 number - value = %lu",
1761 ASM_COMMENT_START, orig_value);
1762 fputc ('\n', asm_out_file);
1768 output_signed_leb128 (value)
1769 register long value;
1771 register long orig_value = value;
1772 register int negative = (value < 0);
1777 register unsigned byte = (value & 0x7f);
1781 value |= 0xfe000000; /* manually sign extend */
1782 if (((value == 0) && ((byte & 0x40) == 0))
1783 || ((value == -1) && ((byte & 0x40) == 1)))
1790 fprintf (asm_out_file, "%s0x%x", ASM_BYTE_OP, (unsigned) byte);
1791 if (flag_debug_asm && more == 0)
1792 fprintf (asm_out_file, "\t%s SLEB128 number - value = %ld",
1793 ASM_COMMENT_START, orig_value);
1794 fputc ('\n', asm_out_file);
1800 /**************** utility functions for attribute functions ******************/
1802 /* Given a pointer to a tree node for some type, return a Dwarf fundamental
1803 type code for the given type.
1805 This routine must only be called for GCC type nodes that correspond to
1806 Dwarf fundamental types.
1808 The current Dwarf draft specification calls for Dwarf fundamental types
1809 to accurately reflect the fact that a given type was either a "plain"
1810 integral type or an explicitly "signed" integral type. Unfortunately,
1811 we can't always do this, because GCC may already have thrown away the
1812 information about the precise way in which the type was originally
1815 typedef signed int my_type;
1817 struct s { my_type f; };
1819 Since we may be stuck here without enought information to do exactly
1820 what is called for in the Dwarf draft specification, we do the best
1821 that we can under the circumstances and always use the "plain" integral
1822 fundamental type codes for int, short, and long types. That's probably
1823 good enough. The additional accuracy called for in the current DWARF
1824 draft specification is probably never even useful in practice. */
1827 fundamental_type_code (type)
1830 if (TREE_CODE (type) == ERROR_MARK)
1833 switch (TREE_CODE (type))
1842 /* Carefully distinguish all the standard types of C,
1843 without messing up if the language is not C.
1844 Note that we check only for the names that contain spaces;
1845 other names might occur by coincidence in other languages. */
1846 if (TYPE_NAME (type) != 0
1847 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
1848 && DECL_NAME (TYPE_NAME (type)) != 0
1849 && TREE_CODE (DECL_NAME (TYPE_NAME (type))) == IDENTIFIER_NODE)
1852 IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
1854 if (!strcmp (name, "unsigned char"))
1855 return FT_unsigned_char;
1856 if (!strcmp (name, "signed char"))
1857 return FT_signed_char;
1858 if (!strcmp (name, "unsigned int"))
1859 return FT_unsigned_integer;
1860 if (!strcmp (name, "short int"))
1862 if (!strcmp (name, "short unsigned int"))
1863 return FT_unsigned_short;
1864 if (!strcmp (name, "long int"))
1866 if (!strcmp (name, "long unsigned int"))
1867 return FT_unsigned_long;
1868 if (!strcmp (name, "long long int"))
1869 return FT_long_long; /* Not grok'ed by svr4 SDB */
1870 if (!strcmp (name, "long long unsigned int"))
1871 return FT_unsigned_long_long; /* Not grok'ed by svr4 SDB */
1874 /* Most integer types will be sorted out above, however, for the
1875 sake of special `array index' integer types, the following code
1876 is also provided. */
1878 if (TYPE_PRECISION (type) == INT_TYPE_SIZE)
1879 return (TREE_UNSIGNED (type) ? FT_unsigned_integer : FT_integer);
1881 if (TYPE_PRECISION (type) == LONG_TYPE_SIZE)
1882 return (TREE_UNSIGNED (type) ? FT_unsigned_long : FT_long);
1884 if (TYPE_PRECISION (type) == LONG_LONG_TYPE_SIZE)
1885 return (TREE_UNSIGNED (type) ? FT_unsigned_long_long : FT_long_long);
1887 if (TYPE_PRECISION (type) == SHORT_TYPE_SIZE)
1888 return (TREE_UNSIGNED (type) ? FT_unsigned_short : FT_short);
1890 if (TYPE_PRECISION (type) == CHAR_TYPE_SIZE)
1891 return (TREE_UNSIGNED (type) ? FT_unsigned_char : FT_char);
1893 if (TYPE_MODE (type) == TImode)
1894 return (TREE_UNSIGNED (type) ? FT_unsigned_int128 : FT_int128);
1896 /* In C++, __java_boolean is an INTEGER_TYPE with precision == 1 */
1897 if (TYPE_PRECISION (type) == 1)
1903 /* Carefully distinguish all the standard types of C,
1904 without messing up if the language is not C. */
1905 if (TYPE_NAME (type) != 0
1906 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
1907 && DECL_NAME (TYPE_NAME (type)) != 0
1908 && TREE_CODE (DECL_NAME (TYPE_NAME (type))) == IDENTIFIER_NODE)
1911 IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
1913 /* Note that here we can run afowl of a serious bug in "classic"
1914 svr4 SDB debuggers. They don't seem to understand the
1915 FT_ext_prec_float type (even though they should). */
1917 if (!strcmp (name, "long double"))
1918 return FT_ext_prec_float;
1921 if (TYPE_PRECISION (type) == DOUBLE_TYPE_SIZE)
1923 /* On the SH, when compiling with -m3e or -m4-single-only, both
1924 float and double are 32 bits. But since the debugger doesn't
1925 know about the subtarget, it always thinks double is 64 bits.
1926 So we have to tell the debugger that the type is float to
1927 make the output of the 'print' command etc. readable. */
1928 if (DOUBLE_TYPE_SIZE == FLOAT_TYPE_SIZE && FLOAT_TYPE_SIZE == 32)
1930 return FT_dbl_prec_float;
1932 if (TYPE_PRECISION (type) == FLOAT_TYPE_SIZE)
1935 /* Note that here we can run afowl of a serious bug in "classic"
1936 svr4 SDB debuggers. They don't seem to understand the
1937 FT_ext_prec_float type (even though they should). */
1939 if (TYPE_PRECISION (type) == LONG_DOUBLE_TYPE_SIZE)
1940 return FT_ext_prec_float;
1944 return FT_complex; /* GNU FORTRAN COMPLEX type. */
1947 return FT_char; /* GNU Pascal CHAR type. Not used in C. */
1950 return FT_boolean; /* GNU FORTRAN BOOLEAN type. */
1953 abort (); /* No other TREE_CODEs are Dwarf fundamental types. */
1958 /* Given a pointer to an arbitrary ..._TYPE tree node, return a pointer to
1959 the Dwarf "root" type for the given input type. The Dwarf "root" type
1960 of a given type is generally the same as the given type, except that if
1961 the given type is a pointer or reference type, then the root type of
1962 the given type is the root type of the "basis" type for the pointer or
1963 reference type. (This definition of the "root" type is recursive.)
1964 Also, the root type of a `const' qualified type or a `volatile'
1965 qualified type is the root type of the given type without the
1969 root_type_1 (type, count)
1973 /* Give up after searching 1000 levels, in case this is a recursive
1974 pointer type. Such types are possible in Ada, but it is not possible
1975 to represent them in DWARF1 debug info. */
1977 return error_mark_node;
1979 switch (TREE_CODE (type))
1982 return error_mark_node;
1985 case REFERENCE_TYPE:
1986 return root_type_1 (TREE_TYPE (type), count+1);
1997 type = root_type_1 (type, 0);
1998 if (type != error_mark_node)
1999 type = type_main_variant (type);
2003 /* Given a pointer to an arbitrary ..._TYPE tree node, write out a sequence
2004 of zero or more Dwarf "type-modifier" bytes applicable to the type. */
2007 write_modifier_bytes_1 (type, decl_const, decl_volatile, count)
2009 register int decl_const;
2010 register int decl_volatile;
2013 if (TREE_CODE (type) == ERROR_MARK)
2016 /* Give up after searching 1000 levels, in case this is a recursive
2017 pointer type. Such types are possible in Ada, but it is not possible
2018 to represent them in DWARF1 debug info. */
2022 if (TYPE_READONLY (type) || decl_const)
2023 ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_const);
2024 if (TYPE_VOLATILE (type) || decl_volatile)
2025 ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_volatile);
2026 switch (TREE_CODE (type))
2029 ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_pointer_to);
2030 write_modifier_bytes_1 (TREE_TYPE (type), 0, 0, count+1);
2033 case REFERENCE_TYPE:
2034 ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_reference_to);
2035 write_modifier_bytes_1 (TREE_TYPE (type), 0, 0, count+1);
2045 write_modifier_bytes (type, decl_const, decl_volatile)
2047 register int decl_const;
2048 register int decl_volatile;
2050 write_modifier_bytes_1 (type, decl_const, decl_volatile, 0);
2053 /* Given a pointer to an arbitrary ..._TYPE tree node, return non-zero if the
2054 given input type is a Dwarf "fundamental" type. Otherwise return zero. */
2057 type_is_fundamental (type)
2060 switch (TREE_CODE (type))
2075 case QUAL_UNION_TYPE:
2080 case REFERENCE_TYPE:
2093 /* Given a pointer to some ..._DECL tree node, generate an assembly language
2094 equate directive which will associate a symbolic name with the current DIE.
2096 The name used is an artificial label generated from the DECL_UID number
2097 associated with the given decl node. The name it gets equated to is the
2098 symbolic label that we (previously) output at the start of the DIE that
2099 we are currently generating.
2101 Calling this function while generating some "decl related" form of DIE
2102 makes it possible to later refer to the DIE which represents the given
2103 decl simply by re-generating the symbolic name from the ..._DECL node's
2107 equate_decl_number_to_die_number (decl)
2110 /* In the case where we are generating a DIE for some ..._DECL node
2111 which represents either some inline function declaration or some
2112 entity declared within an inline function declaration/definition,
2113 setup a symbolic name for the current DIE so that we have a name
2114 for this DIE that we can easily refer to later on within
2115 AT_abstract_origin attributes. */
2117 char decl_label[MAX_ARTIFICIAL_LABEL_BYTES];
2118 char die_label[MAX_ARTIFICIAL_LABEL_BYTES];
2120 sprintf (decl_label, DECL_NAME_FMT, DECL_UID (decl));
2121 sprintf (die_label, DIE_BEGIN_LABEL_FMT, current_dienum);
2122 ASM_OUTPUT_DEF (asm_out_file, decl_label, die_label);
2125 /* Given a pointer to some ..._TYPE tree node, generate an assembly language
2126 equate directive which will associate a symbolic name with the current DIE.
2128 The name used is an artificial label generated from the TYPE_UID number
2129 associated with the given type node. The name it gets equated to is the
2130 symbolic label that we (previously) output at the start of the DIE that
2131 we are currently generating.
2133 Calling this function while generating some "type related" form of DIE
2134 makes it easy to later refer to the DIE which represents the given type
2135 simply by re-generating the alternative name from the ..._TYPE node's
2139 equate_type_number_to_die_number (type)
2142 char type_label[MAX_ARTIFICIAL_LABEL_BYTES];
2143 char die_label[MAX_ARTIFICIAL_LABEL_BYTES];
2145 /* We are generating a DIE to represent the main variant of this type
2146 (i.e the type without any const or volatile qualifiers) so in order
2147 to get the equate to come out right, we need to get the main variant
2150 type = type_main_variant (type);
2152 sprintf (type_label, TYPE_NAME_FMT, TYPE_UID (type));
2153 sprintf (die_label, DIE_BEGIN_LABEL_FMT, current_dienum);
2154 ASM_OUTPUT_DEF (asm_out_file, type_label, die_label);
2158 output_reg_number (rtl)
2161 register unsigned regno = REGNO (rtl);
2163 if (regno >= DWARF_FRAME_REGISTERS)
2165 warning_with_decl (dwarf_last_decl, "internal regno botch: regno = %d\n",
2169 fprintf (asm_out_file, "%s0x%x",
2170 UNALIGNED_INT_ASM_OP, DBX_REGISTER_NUMBER (regno));
2173 fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
2174 PRINT_REG (rtl, 0, asm_out_file);
2176 fputc ('\n', asm_out_file);
2179 /* The following routine is a nice and simple transducer. It converts the
2180 RTL for a variable or parameter (resident in memory) into an equivalent
2181 Dwarf representation of a mechanism for getting the address of that same
2182 variable onto the top of a hypothetical "address evaluation" stack.
2184 When creating memory location descriptors, we are effectively trans-
2185 forming the RTL for a memory-resident object into its Dwarf postfix
2186 expression equivalent. This routine just recursively descends an
2187 RTL tree, turning it into Dwarf postfix code as it goes. */
2190 output_mem_loc_descriptor (rtl)
2193 /* Note that for a dynamically sized array, the location we will
2194 generate a description of here will be the lowest numbered location
2195 which is actually within the array. That's *not* necessarily the
2196 same as the zeroth element of the array. */
2198 #ifdef ASM_SIMPLIFY_DWARF_ADDR
2199 rtl = ASM_SIMPLIFY_DWARF_ADDR (rtl);
2202 switch (GET_CODE (rtl))
2206 /* The case of a subreg may arise when we have a local (register)
2207 variable or a formal (register) parameter which doesn't quite
2208 fill up an entire register. For now, just assume that it is
2209 legitimate to make the Dwarf info refer to the whole register
2210 which contains the given subreg. */
2212 rtl = SUBREG_REG (rtl);
2217 /* Whenever a register number forms a part of the description of
2218 the method for calculating the (dynamic) address of a memory
2219 resident object, DWARF rules require the register number to
2220 be referred to as a "base register". This distinction is not
2221 based in any way upon what category of register the hardware
2222 believes the given register belongs to. This is strictly
2223 DWARF terminology we're dealing with here.
2225 Note that in cases where the location of a memory-resident data
2226 object could be expressed as:
2228 OP_ADD (OP_BASEREG (basereg), OP_CONST (0))
2230 the actual DWARF location descriptor that we generate may just
2231 be OP_BASEREG (basereg). This may look deceptively like the
2232 object in question was allocated to a register (rather than
2233 in memory) so DWARF consumers need to be aware of the subtle
2234 distinction between OP_REG and OP_BASEREG. */
2236 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_BASEREG);
2237 output_reg_number (rtl);
2241 output_mem_loc_descriptor (XEXP (rtl, 0));
2242 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_DEREF4);
2247 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_ADDR);
2248 ASM_OUTPUT_DWARF_ADDR_CONST (asm_out_file, rtl);
2252 output_mem_loc_descriptor (XEXP (rtl, 0));
2253 output_mem_loc_descriptor (XEXP (rtl, 1));
2254 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_ADD);
2258 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_CONST);
2259 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, INTVAL (rtl));
2263 /* If a pseudo-reg is optimized away, it is possible for it to
2264 be replaced with a MEM containing a multiply. Use a GNU extension
2266 output_mem_loc_descriptor (XEXP (rtl, 0));
2267 output_mem_loc_descriptor (XEXP (rtl, 1));
2268 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_MULT);
2276 /* Output a proper Dwarf location descriptor for a variable or parameter
2277 which is either allocated in a register or in a memory location. For
2278 a register, we just generate an OP_REG and the register number. For a
2279 memory location we provide a Dwarf postfix expression describing how to
2280 generate the (dynamic) address of the object onto the address stack. */
2283 output_loc_descriptor (rtl)
2286 switch (GET_CODE (rtl))
2290 /* The case of a subreg may arise when we have a local (register)
2291 variable or a formal (register) parameter which doesn't quite
2292 fill up an entire register. For now, just assume that it is
2293 legitimate to make the Dwarf info refer to the whole register
2294 which contains the given subreg. */
2296 rtl = SUBREG_REG (rtl);
2300 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_REG);
2301 output_reg_number (rtl);
2305 output_mem_loc_descriptor (XEXP (rtl, 0));
2309 abort (); /* Should never happen */
2313 /* Given a tree node describing an array bound (either lower or upper)
2314 output a representation for that bound. */
2317 output_bound_representation (bound, dim_num, u_or_l)
2318 register tree bound;
2319 register unsigned dim_num; /* For multi-dimensional arrays. */
2320 register char u_or_l; /* Designates upper or lower bound. */
2322 switch (TREE_CODE (bound))
2328 /* All fixed-bounds are represented by INTEGER_CST nodes. */
2331 if (host_integerp (bound, 0))
2332 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, tree_low_cst (bound, 0));
2337 /* Dynamic bounds may be represented by NOP_EXPR nodes containing
2338 SAVE_EXPR nodes, in which case we can do something, or as
2339 an expression, which we cannot represent. */
2341 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
2342 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
2344 sprintf (begin_label, BOUND_BEGIN_LABEL_FMT,
2345 current_dienum, dim_num, u_or_l);
2347 sprintf (end_label, BOUND_END_LABEL_FMT,
2348 current_dienum, dim_num, u_or_l);
2350 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
2351 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
2353 /* If optimization is turned on, the SAVE_EXPRs that describe
2354 how to access the upper bound values are essentially bogus.
2355 They only describe (at best) how to get at these values at
2356 the points in the generated code right after they have just
2357 been computed. Worse yet, in the typical case, the upper
2358 bound values will not even *be* computed in the optimized
2359 code, so these SAVE_EXPRs are entirely bogus.
2361 In order to compensate for this fact, we check here to see
2362 if optimization is enabled, and if so, we effectively create
2363 an empty location description for the (unknown and unknowable)
2366 This should not cause too much trouble for existing (stupid?)
2367 debuggers because they have to deal with empty upper bounds
2368 location descriptions anyway in order to be able to deal with
2369 incomplete array types.
2371 Of course an intelligent debugger (GDB?) should be able to
2372 comprehend that a missing upper bound specification in a
2373 array type used for a storage class `auto' local array variable
2374 indicates that the upper bound is both unknown (at compile-
2375 time) and unknowable (at run-time) due to optimization. */
2379 while (TREE_CODE (bound) == NOP_EXPR
2380 || TREE_CODE (bound) == CONVERT_EXPR)
2381 bound = TREE_OPERAND (bound, 0);
2383 if (TREE_CODE (bound) == SAVE_EXPR)
2384 output_loc_descriptor
2385 (eliminate_regs (SAVE_EXPR_RTL (bound), 0, NULL_RTX));
2388 ASM_OUTPUT_LABEL (asm_out_file, end_label);
2395 /* Recursive function to output a sequence of value/name pairs for
2396 enumeration constants in reversed order. This is called from
2397 enumeration_type_die. */
2400 output_enumeral_list (link)
2405 output_enumeral_list (TREE_CHAIN (link));
2407 if (host_integerp (TREE_VALUE (link), 0))
2408 ASM_OUTPUT_DWARF_DATA4 (asm_out_file,
2409 tree_low_cst (TREE_VALUE (link), 0));
2411 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file,
2412 IDENTIFIER_POINTER (TREE_PURPOSE (link)));
2416 /* Given an unsigned value, round it up to the lowest multiple of `boundary'
2417 which is not less than the value itself. */
2419 static inline HOST_WIDE_INT
2420 ceiling (value, boundary)
2421 register HOST_WIDE_INT value;
2422 register unsigned int boundary;
2424 return (((value + boundary - 1) / boundary) * boundary);
2427 /* Given a pointer to what is assumed to be a FIELD_DECL node, return a
2428 pointer to the declared type for the relevant field variable, or return
2429 `integer_type_node' if the given node turns out to be an ERROR_MARK node. */
2437 if (TREE_CODE (decl) == ERROR_MARK)
2438 return integer_type_node;
2440 type = DECL_BIT_FIELD_TYPE (decl);
2442 type = TREE_TYPE (decl);
2446 /* Given a pointer to a tree node, assumed to be some kind of a ..._TYPE
2447 node, return the alignment in bits for the type, or else return
2448 BITS_PER_WORD if the node actually turns out to be an ERROR_MARK node. */
2450 static inline unsigned int
2451 simple_type_align_in_bits (type)
2454 return (TREE_CODE (type) != ERROR_MARK) ? TYPE_ALIGN (type) : BITS_PER_WORD;
2457 /* Given a pointer to a tree node, assumed to be some kind of a ..._TYPE
2458 node, return the size in bits for the type if it is a constant, or
2459 else return the alignment for the type if the type's size is not
2460 constant, or else return BITS_PER_WORD if the type actually turns out
2461 to be an ERROR_MARK node. */
2463 static inline unsigned HOST_WIDE_INT
2464 simple_type_size_in_bits (type)
2467 tree type_size_tree;
2469 if (TREE_CODE (type) == ERROR_MARK)
2470 return BITS_PER_WORD;
2471 type_size_tree = TYPE_SIZE (type);
2473 if (type_size_tree == NULL_TREE)
2475 if (! host_integerp (type_size_tree, 1))
2476 return TYPE_ALIGN (type);
2477 return tree_low_cst (type_size_tree, 1);
2480 /* Given a pointer to what is assumed to be a FIELD_DECL node, compute and
2481 return the byte offset of the lowest addressed byte of the "containing
2482 object" for the given FIELD_DECL, or return 0 if we are unable to deter-
2483 mine what that offset is, either because the argument turns out to be a
2484 pointer to an ERROR_MARK node, or because the offset is actually variable.
2485 (We can't handle the latter case just yet.) */
2487 static HOST_WIDE_INT
2488 field_byte_offset (decl)
2491 unsigned int type_align_in_bytes;
2492 unsigned int type_align_in_bits;
2493 unsigned HOST_WIDE_INT type_size_in_bits;
2494 HOST_WIDE_INT object_offset_in_align_units;
2495 HOST_WIDE_INT object_offset_in_bits;
2496 HOST_WIDE_INT object_offset_in_bytes;
2498 tree field_size_tree;
2499 HOST_WIDE_INT bitpos_int;
2500 HOST_WIDE_INT deepest_bitpos;
2501 unsigned HOST_WIDE_INT field_size_in_bits;
2503 if (TREE_CODE (decl) == ERROR_MARK)
2506 if (TREE_CODE (decl) != FIELD_DECL)
2509 type = field_type (decl);
2510 field_size_tree = DECL_SIZE (decl);
2512 /* The size could be unspecified if there was an error, or for
2513 a flexible array member. */
2514 if (! field_size_tree)
2515 field_size_tree = bitsize_zero_node;
2517 /* We cannot yet cope with fields whose positions or sizes are variable,
2518 so for now, when we see such things, we simply return 0. Someday,
2519 we may be able to handle such cases, but it will be damn difficult. */
2521 if (! host_integerp (bit_position (decl), 0)
2522 || ! host_integerp (field_size_tree, 1))
2525 bitpos_int = int_bit_position (decl);
2526 field_size_in_bits = tree_low_cst (field_size_tree, 1);
2528 type_size_in_bits = simple_type_size_in_bits (type);
2529 type_align_in_bits = simple_type_align_in_bits (type);
2530 type_align_in_bytes = type_align_in_bits / BITS_PER_UNIT;
2532 /* Note that the GCC front-end doesn't make any attempt to keep track
2533 of the starting bit offset (relative to the start of the containing
2534 structure type) of the hypothetical "containing object" for a bit-
2535 field. Thus, when computing the byte offset value for the start of
2536 the "containing object" of a bit-field, we must deduce this infor-
2539 This can be rather tricky to do in some cases. For example, handling
2540 the following structure type definition when compiling for an i386/i486
2541 target (which only aligns long long's to 32-bit boundaries) can be very
2546 long long field2:31;
2549 Fortunately, there is a simple rule-of-thumb which can be used in such
2550 cases. When compiling for an i386/i486, GCC will allocate 8 bytes for
2551 the structure shown above. It decides to do this based upon one simple
2552 rule for bit-field allocation. Quite simply, GCC allocates each "con-
2553 taining object" for each bit-field at the first (i.e. lowest addressed)
2554 legitimate alignment boundary (based upon the required minimum alignment
2555 for the declared type of the field) which it can possibly use, subject
2556 to the condition that there is still enough available space remaining
2557 in the containing object (when allocated at the selected point) to
2558 fully accommodate all of the bits of the bit-field itself.
2560 This simple rule makes it obvious why GCC allocates 8 bytes for each
2561 object of the structure type shown above. When looking for a place to
2562 allocate the "containing object" for `field2', the compiler simply tries
2563 to allocate a 64-bit "containing object" at each successive 32-bit
2564 boundary (starting at zero) until it finds a place to allocate that 64-
2565 bit field such that at least 31 contiguous (and previously unallocated)
2566 bits remain within that selected 64 bit field. (As it turns out, for
2567 the example above, the compiler finds that it is OK to allocate the
2568 "containing object" 64-bit field at bit-offset zero within the
2571 Here we attempt to work backwards from the limited set of facts we're
2572 given, and we try to deduce from those facts, where GCC must have
2573 believed that the containing object started (within the structure type).
2575 The value we deduce is then used (by the callers of this routine) to
2576 generate AT_location and AT_bit_offset attributes for fields (both
2577 bit-fields and, in the case of AT_location, regular fields as well). */
2579 /* Figure out the bit-distance from the start of the structure to the
2580 "deepest" bit of the bit-field. */
2581 deepest_bitpos = bitpos_int + field_size_in_bits;
2583 /* This is the tricky part. Use some fancy footwork to deduce where the
2584 lowest addressed bit of the containing object must be. */
2585 object_offset_in_bits
2586 = ceiling (deepest_bitpos, type_align_in_bits) - type_size_in_bits;
2588 /* Compute the offset of the containing object in "alignment units". */
2589 object_offset_in_align_units = object_offset_in_bits / type_align_in_bits;
2591 /* Compute the offset of the containing object in bytes. */
2592 object_offset_in_bytes = object_offset_in_align_units * type_align_in_bytes;
2594 /* The above code assumes that the field does not cross an alignment
2595 boundary. This can happen if PCC_BITFIELD_TYPE_MATTERS is not defined,
2596 or if the structure is packed. If this happens, then we get an object
2597 which starts after the bitfield, which means that the bit offset is
2598 negative. Gdb fails when given negative bit offsets. We avoid this
2599 by recomputing using the first bit of the bitfield. This will give
2600 us an object which does not completely contain the bitfield, but it
2601 will be aligned, and it will contain the first bit of the bitfield.
2603 However, only do this for a BYTES_BIG_ENDIAN target. For a
2604 ! BYTES_BIG_ENDIAN target, bitpos_int + field_size_in_bits is the first
2605 first bit of the bitfield. If we recompute using bitpos_int + 1 below,
2606 then we end up computing the object byte offset for the wrong word of the
2607 desired bitfield, which in turn causes the field offset to be negative
2608 in bit_offset_attribute. */
2609 if (BYTES_BIG_ENDIAN
2610 && object_offset_in_bits > bitpos_int)
2612 deepest_bitpos = bitpos_int + 1;
2613 object_offset_in_bits
2614 = ceiling (deepest_bitpos, type_align_in_bits) - type_size_in_bits;
2615 object_offset_in_align_units = (object_offset_in_bits
2616 / type_align_in_bits);
2617 object_offset_in_bytes = (object_offset_in_align_units
2618 * type_align_in_bytes);
2621 return object_offset_in_bytes;
2624 /****************************** attributes *********************************/
2626 /* The following routines are responsible for writing out the various types
2627 of Dwarf attributes (and any following data bytes associated with them).
2628 These routines are listed in order based on the numerical codes of their
2629 associated attributes. */
2631 /* Generate an AT_sibling attribute. */
2634 sibling_attribute ()
2636 char label[MAX_ARTIFICIAL_LABEL_BYTES];
2638 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_sibling);
2639 sprintf (label, DIE_BEGIN_LABEL_FMT, NEXT_DIE_NUM);
2640 ASM_OUTPUT_DWARF_REF (asm_out_file, label);
2643 /* Output the form of location attributes suitable for whole variables and
2644 whole parameters. Note that the location attributes for struct fields
2645 are generated by the routine `data_member_location_attribute' below. */
2648 location_attribute (rtl)
2651 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
2652 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
2654 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_location);
2655 sprintf (begin_label, LOC_BEGIN_LABEL_FMT, current_dienum);
2656 sprintf (end_label, LOC_END_LABEL_FMT, current_dienum);
2657 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
2658 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
2660 /* Handle a special case. If we are about to output a location descriptor
2661 for a variable or parameter which has been optimized out of existence,
2662 don't do that. Instead we output a zero-length location descriptor
2663 value as part of the location attribute.
2665 A variable which has been optimized out of existence will have a
2666 DECL_RTL value which denotes a pseudo-reg.
2668 Currently, in some rare cases, variables can have DECL_RTL values
2669 which look like (MEM (REG pseudo-reg#)). These cases are due to
2670 bugs elsewhere in the compiler. We treat such cases
2671 as if the variable(s) in question had been optimized out of existence.
2673 Note that in all cases where we wish to express the fact that a
2674 variable has been optimized out of existence, we do not simply
2675 suppress the generation of the entire location attribute because
2676 the absence of a location attribute in certain kinds of DIEs is
2677 used to indicate something else entirely... i.e. that the DIE
2678 represents an object declaration, but not a definition. So saith
2682 if (! is_pseudo_reg (rtl)
2683 && (GET_CODE (rtl) != MEM || ! is_pseudo_reg (XEXP (rtl, 0))))
2684 output_loc_descriptor (rtl);
2686 ASM_OUTPUT_LABEL (asm_out_file, end_label);
2689 /* Output the specialized form of location attribute used for data members
2690 of struct and union types.
2692 In the special case of a FIELD_DECL node which represents a bit-field,
2693 the "offset" part of this special location descriptor must indicate the
2694 distance in bytes from the lowest-addressed byte of the containing
2695 struct or union type to the lowest-addressed byte of the "containing
2696 object" for the bit-field. (See the `field_byte_offset' function above.)
2698 For any given bit-field, the "containing object" is a hypothetical
2699 object (of some integral or enum type) within which the given bit-field
2700 lives. The type of this hypothetical "containing object" is always the
2701 same as the declared type of the individual bit-field itself (for GCC
2702 anyway... the DWARF spec doesn't actually mandate this).
2704 Note that it is the size (in bytes) of the hypothetical "containing
2705 object" which will be given in the AT_byte_size attribute for this
2706 bit-field. (See the `byte_size_attribute' function below.) It is
2707 also used when calculating the value of the AT_bit_offset attribute.
2708 (See the `bit_offset_attribute' function below.) */
2711 data_member_location_attribute (t)
2714 register unsigned object_offset_in_bytes;
2715 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
2716 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
2718 if (TREE_CODE (t) == TREE_VEC)
2719 object_offset_in_bytes = tree_low_cst (BINFO_OFFSET (t), 0);
2721 object_offset_in_bytes = field_byte_offset (t);
2723 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_location);
2724 sprintf (begin_label, LOC_BEGIN_LABEL_FMT, current_dienum);
2725 sprintf (end_label, LOC_END_LABEL_FMT, current_dienum);
2726 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
2727 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
2728 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_CONST);
2729 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, object_offset_in_bytes);
2730 ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_ADD);
2731 ASM_OUTPUT_LABEL (asm_out_file, end_label);
2734 /* Output an AT_const_value attribute for a variable or a parameter which
2735 does not have a "location" either in memory or in a register. These
2736 things can arise in GNU C when a constant is passed as an actual
2737 parameter to an inlined function. They can also arise in C++ where
2738 declared constants do not necessarily get memory "homes". */
2741 const_value_attribute (rtl)
2744 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
2745 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
2747 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_const_value_block4);
2748 sprintf (begin_label, LOC_BEGIN_LABEL_FMT, current_dienum);
2749 sprintf (end_label, LOC_END_LABEL_FMT, current_dienum);
2750 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, end_label, begin_label);
2751 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
2753 switch (GET_CODE (rtl))
2756 /* Note that a CONST_INT rtx could represent either an integer or
2757 a floating-point constant. A CONST_INT is used whenever the
2758 constant will fit into a single word. In all such cases, the
2759 original mode of the constant value is wiped out, and the
2760 CONST_INT rtx is assigned VOIDmode. Since we no longer have
2761 precise mode information for these constants, we always just
2762 output them using 4 bytes. */
2764 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, (unsigned) INTVAL (rtl));
2768 /* Note that a CONST_DOUBLE rtx could represent either an integer
2769 or a floating-point constant. A CONST_DOUBLE is used whenever
2770 the constant requires more than one word in order to be adequately
2771 represented. In all such cases, the original mode of the constant
2772 value is preserved as the mode of the CONST_DOUBLE rtx, but for
2773 simplicity we always just output CONST_DOUBLEs using 8 bytes. */
2775 ASM_OUTPUT_DWARF_DATA8 (asm_out_file,
2776 (unsigned int) CONST_DOUBLE_HIGH (rtl),
2777 (unsigned int) CONST_DOUBLE_LOW (rtl));
2781 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, XSTR (rtl, 0));
2787 ASM_OUTPUT_DWARF_ADDR_CONST (asm_out_file, rtl);
2791 /* In cases where an inlined instance of an inline function is passed
2792 the address of an `auto' variable (which is local to the caller)
2793 we can get a situation where the DECL_RTL of the artificial
2794 local variable (for the inlining) which acts as a stand-in for
2795 the corresponding formal parameter (of the inline function)
2796 will look like (plus:SI (reg:SI FRAME_PTR) (const_int ...)).
2797 This is not exactly a compile-time constant expression, but it
2798 isn't the address of the (artificial) local variable either.
2799 Rather, it represents the *value* which the artificial local
2800 variable always has during its lifetime. We currently have no
2801 way to represent such quasi-constant values in Dwarf, so for now
2802 we just punt and generate an AT_const_value attribute with form
2803 FORM_BLOCK4 and a length of zero. */
2807 abort (); /* No other kinds of rtx should be possible here. */
2810 ASM_OUTPUT_LABEL (asm_out_file, end_label);
2813 /* Generate *either* an AT_location attribute or else an AT_const_value
2814 data attribute for a variable or a parameter. We generate the
2815 AT_const_value attribute only in those cases where the given
2816 variable or parameter does not have a true "location" either in
2817 memory or in a register. This can happen (for example) when a
2818 constant is passed as an actual argument in a call to an inline
2819 function. (It's possible that these things can crop up in other
2820 ways also.) Note that one type of constant value which can be
2821 passed into an inlined function is a constant pointer. This can
2822 happen for example if an actual argument in an inlined function
2823 call evaluates to a compile-time constant address. */
2826 location_or_const_value_attribute (decl)
2831 if (TREE_CODE (decl) == ERROR_MARK)
2834 if ((TREE_CODE (decl) != VAR_DECL) && (TREE_CODE (decl) != PARM_DECL))
2836 /* Should never happen. */
2841 /* Here we have to decide where we are going to say the parameter "lives"
2842 (as far as the debugger is concerned). We only have a couple of choices.
2843 GCC provides us with DECL_RTL and with DECL_INCOMING_RTL. DECL_RTL
2844 normally indicates where the parameter lives during most of the activa-
2845 tion of the function. If optimization is enabled however, this could
2846 be either NULL or else a pseudo-reg. Both of those cases indicate that
2847 the parameter doesn't really live anywhere (as far as the code generation
2848 parts of GCC are concerned) during most of the function's activation.
2849 That will happen (for example) if the parameter is never referenced
2850 within the function.
2852 We could just generate a location descriptor here for all non-NULL
2853 non-pseudo values of DECL_RTL and ignore all of the rest, but we can
2854 be a little nicer than that if we also consider DECL_INCOMING_RTL in
2855 cases where DECL_RTL is NULL or is a pseudo-reg.
2857 Note however that we can only get away with using DECL_INCOMING_RTL as
2858 a backup substitute for DECL_RTL in certain limited cases. In cases
2859 where DECL_ARG_TYPE(decl) indicates the same type as TREE_TYPE(decl)
2860 we can be sure that the parameter was passed using the same type as it
2861 is declared to have within the function, and that its DECL_INCOMING_RTL
2862 points us to a place where a value of that type is passed. In cases
2863 where DECL_ARG_TYPE(decl) and TREE_TYPE(decl) are different types
2864 however, we cannot (in general) use DECL_INCOMING_RTL as a backup
2865 substitute for DECL_RTL because in these cases, DECL_INCOMING_RTL
2866 points us to a value of some type which is *different* from the type
2867 of the parameter itself. Thus, if we tried to use DECL_INCOMING_RTL
2868 to generate a location attribute in such cases, the debugger would
2869 end up (for example) trying to fetch a `float' from a place which
2870 actually contains the first part of a `double'. That would lead to
2871 really incorrect and confusing output at debug-time, and we don't
2872 want that now do we?
2874 So in general, we DO NOT use DECL_INCOMING_RTL as a backup for DECL_RTL
2875 in cases where DECL_ARG_TYPE(decl) != TREE_TYPE(decl). There are a
2876 couple of cute exceptions however. On little-endian machines we can
2877 get away with using DECL_INCOMING_RTL even when DECL_ARG_TYPE(decl) is
2878 not the same as TREE_TYPE(decl) but only when DECL_ARG_TYPE(decl) is
2879 an integral type which is smaller than TREE_TYPE(decl). These cases
2880 arise when (on a little-endian machine) a non-prototyped function has
2881 a parameter declared to be of type `short' or `char'. In such cases,
2882 TREE_TYPE(decl) will be `short' or `char', DECL_ARG_TYPE(decl) will be
2883 `int', and DECL_INCOMING_RTL will point to the lowest-order byte of the
2884 passed `int' value. If the debugger then uses that address to fetch a
2885 `short' or a `char' (on a little-endian machine) the result will be the
2886 correct data, so we allow for such exceptional cases below.
2888 Note that our goal here is to describe the place where the given formal
2889 parameter lives during most of the function's activation (i.e. between
2890 the end of the prologue and the start of the epilogue). We'll do that
2891 as best as we can. Note however that if the given formal parameter is
2892 modified sometime during the execution of the function, then a stack
2893 backtrace (at debug-time) will show the function as having been called
2894 with the *new* value rather than the value which was originally passed
2895 in. This happens rarely enough that it is not a major problem, but it
2896 *is* a problem, and I'd like to fix it. A future version of dwarfout.c
2897 may generate two additional attributes for any given TAG_formal_parameter
2898 DIE which will describe the "passed type" and the "passed location" for
2899 the given formal parameter in addition to the attributes we now generate
2900 to indicate the "declared type" and the "active location" for each
2901 parameter. This additional set of attributes could be used by debuggers
2902 for stack backtraces.
2904 Separately, note that sometimes DECL_RTL can be NULL and DECL_INCOMING_RTL
2905 can be NULL also. This happens (for example) for inlined-instances of
2906 inline function formal parameters which are never referenced. This really
2907 shouldn't be happening. All PARM_DECL nodes should get valid non-NULL
2908 DECL_INCOMING_RTL values, but integrate.c doesn't currently generate
2909 these values for inlined instances of inline function parameters, so
2910 when we see such cases, we are just out-of-luck for the time
2911 being (until integrate.c gets fixed).
2914 /* Use DECL_RTL as the "location" unless we find something better. */
2915 rtl = DECL_RTL (decl);
2917 if (TREE_CODE (decl) == PARM_DECL)
2918 if (rtl == NULL_RTX || is_pseudo_reg (rtl))
2920 /* This decl represents a formal parameter which was optimized out. */
2921 register tree declared_type = type_main_variant (TREE_TYPE (decl));
2922 register tree passed_type = type_main_variant (DECL_ARG_TYPE (decl));
2924 /* Note that DECL_INCOMING_RTL may be NULL in here, but we handle
2925 *all* cases where (rtl == NULL_RTX) just below. */
2927 if (declared_type == passed_type)
2928 rtl = DECL_INCOMING_RTL (decl);
2929 else if (! BYTES_BIG_ENDIAN)
2930 if (TREE_CODE (declared_type) == INTEGER_TYPE)
2932 if (TYPE_SIZE (declared_type) <= TYPE_SIZE (passed_type))
2933 rtl = DECL_INCOMING_RTL (decl);
2936 if (rtl == NULL_RTX)
2939 rtl = eliminate_regs (rtl, 0, NULL_RTX);
2940 #ifdef LEAF_REG_REMAP
2941 if (current_function_uses_only_leaf_regs)
2942 leaf_renumber_regs_insn (rtl);
2945 switch (GET_CODE (rtl))
2948 /* The address of a variable that was optimized away; don't emit
2958 case PLUS: /* DECL_RTL could be (plus (reg ...) (const_int ...)) */
2959 const_value_attribute (rtl);
2965 location_attribute (rtl);
2969 /* ??? CONCAT is used for complex variables, which may have the real
2970 part stored in one place and the imag part stored somewhere else.
2971 DWARF1 has no way to describe a variable that lives in two different
2972 places, so we just describe where the first part lives, and hope that
2973 the second part is stored after it. */
2974 location_attribute (XEXP (rtl, 0));
2978 abort (); /* Should never happen. */
2982 /* Generate an AT_name attribute given some string value to be included as
2983 the value of the attribute. */
2986 name_attribute (name_string)
2987 register const char *name_string;
2989 if (name_string && *name_string)
2991 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_name);
2992 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, name_string);
2997 fund_type_attribute (ft_code)
2998 register unsigned ft_code;
3000 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_fund_type);
3001 ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file, ft_code);
3005 mod_fund_type_attribute (type, decl_const, decl_volatile)
3007 register int decl_const;
3008 register int decl_volatile;
3010 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
3011 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
3013 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_mod_fund_type);
3014 sprintf (begin_label, MT_BEGIN_LABEL_FMT, current_dienum);
3015 sprintf (end_label, MT_END_LABEL_FMT, current_dienum);
3016 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
3017 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
3018 write_modifier_bytes (type, decl_const, decl_volatile);
3019 ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file,
3020 fundamental_type_code (root_type (type)));
3021 ASM_OUTPUT_LABEL (asm_out_file, end_label);
3025 user_def_type_attribute (type)
3028 char ud_type_name[MAX_ARTIFICIAL_LABEL_BYTES];
3030 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_user_def_type);
3031 sprintf (ud_type_name, TYPE_NAME_FMT, TYPE_UID (type));
3032 ASM_OUTPUT_DWARF_REF (asm_out_file, ud_type_name);
3036 mod_u_d_type_attribute (type, decl_const, decl_volatile)
3038 register int decl_const;
3039 register int decl_volatile;
3041 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
3042 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
3043 char ud_type_name[MAX_ARTIFICIAL_LABEL_BYTES];
3045 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_mod_u_d_type);
3046 sprintf (begin_label, MT_BEGIN_LABEL_FMT, current_dienum);
3047 sprintf (end_label, MT_END_LABEL_FMT, current_dienum);
3048 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
3049 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
3050 write_modifier_bytes (type, decl_const, decl_volatile);
3051 sprintf (ud_type_name, TYPE_NAME_FMT, TYPE_UID (root_type (type)));
3052 ASM_OUTPUT_DWARF_REF (asm_out_file, ud_type_name);
3053 ASM_OUTPUT_LABEL (asm_out_file, end_label);
3056 #ifdef USE_ORDERING_ATTRIBUTE
3058 ordering_attribute (ordering)
3059 register unsigned ordering;
3061 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_ordering);
3062 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, ordering);
3064 #endif /* defined(USE_ORDERING_ATTRIBUTE) */
3066 /* Note that the block of subscript information for an array type also
3067 includes information about the element type of type given array type. */
3070 subscript_data_attribute (type)
3073 register unsigned dimension_number;
3074 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
3075 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
3077 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_subscr_data);
3078 sprintf (begin_label, SS_BEGIN_LABEL_FMT, current_dienum);
3079 sprintf (end_label, SS_END_LABEL_FMT, current_dienum);
3080 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
3081 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
3083 /* The GNU compilers represent multidimensional array types as sequences
3084 of one dimensional array types whose element types are themselves array
3085 types. Here we squish that down, so that each multidimensional array
3086 type gets only one array_type DIE in the Dwarf debugging info. The
3087 draft Dwarf specification say that we are allowed to do this kind
3088 of compression in C (because there is no difference between an
3089 array or arrays and a multidimensional array in C) but for other
3090 source languages (e.g. Ada) we probably shouldn't do this. */
3092 for (dimension_number = 0;
3093 TREE_CODE (type) == ARRAY_TYPE;
3094 type = TREE_TYPE (type), dimension_number++)
3096 register tree domain = TYPE_DOMAIN (type);
3098 /* Arrays come in three flavors. Unspecified bounds, fixed
3099 bounds, and (in GNU C only) variable bounds. Handle all
3100 three forms here. */
3104 /* We have an array type with specified bounds. */
3106 register tree lower = TYPE_MIN_VALUE (domain);
3107 register tree upper = TYPE_MAX_VALUE (domain);
3109 /* Handle only fundamental types as index types for now. */
3110 if (! type_is_fundamental (domain))
3113 /* Output the representation format byte for this dimension. */
3114 ASM_OUTPUT_DWARF_FMT_BYTE (asm_out_file,
3115 FMT_CODE (1, TREE_CODE (lower) == INTEGER_CST,
3116 upper && TREE_CODE (upper) == INTEGER_CST));
3118 /* Output the index type for this dimension. */
3119 ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file,
3120 fundamental_type_code (domain));
3122 /* Output the representation for the lower bound. */
3123 output_bound_representation (lower, dimension_number, 'l');
3125 /* Output the representation for the upper bound. */
3127 output_bound_representation (upper, dimension_number, 'u');
3129 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, 0);
3133 /* We have an array type with an unspecified length. For C and
3134 C++ we can assume that this really means that (a) the index
3135 type is an integral type, and (b) the lower bound is zero.
3136 Note that Dwarf defines the representation of an unspecified
3137 (upper) bound as being a zero-length location description. */
3139 /* Output the array-bounds format byte. */
3141 ASM_OUTPUT_DWARF_FMT_BYTE (asm_out_file, FMT_FT_C_X);
3143 /* Output the (assumed) index type. */
3145 ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file, FT_integer);
3147 /* Output the (assumed) lower bound (constant) value. */
3149 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0);
3151 /* Output the (empty) location description for the upper bound. */
3153 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, 0);
3157 /* Output the prefix byte that says that the element type is coming up. */
3159 ASM_OUTPUT_DWARF_FMT_BYTE (asm_out_file, FMT_ET);
3161 /* Output a representation of the type of the elements of this array type. */
3163 type_attribute (type, 0, 0);
3165 ASM_OUTPUT_LABEL (asm_out_file, end_label);
3169 byte_size_attribute (tree_node)
3170 register tree tree_node;
3172 register unsigned size;
3174 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_byte_size);
3175 switch (TREE_CODE (tree_node))
3184 case QUAL_UNION_TYPE:
3186 size = int_size_in_bytes (tree_node);
3190 /* For a data member of a struct or union, the AT_byte_size is
3191 generally given as the number of bytes normally allocated for
3192 an object of the *declared* type of the member itself. This
3193 is true even for bit-fields. */
3194 size = simple_type_size_in_bits (field_type (tree_node))
3202 /* Note that `size' might be -1 when we get to this point. If it
3203 is, that indicates that the byte size of the entity in question
3204 is variable. We have no good way of expressing this fact in Dwarf
3205 at the present time, so just let the -1 pass on through. */
3207 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, size);
3210 /* For a FIELD_DECL node which represents a bit-field, output an attribute
3211 which specifies the distance in bits from the highest order bit of the
3212 "containing object" for the bit-field to the highest order bit of the
3215 For any given bit-field, the "containing object" is a hypothetical
3216 object (of some integral or enum type) within which the given bit-field
3217 lives. The type of this hypothetical "containing object" is always the
3218 same as the declared type of the individual bit-field itself.
3220 The determination of the exact location of the "containing object" for
3221 a bit-field is rather complicated. It's handled by the `field_byte_offset'
3224 Note that it is the size (in bytes) of the hypothetical "containing
3225 object" which will be given in the AT_byte_size attribute for this
3226 bit-field. (See `byte_size_attribute' above.) */
3229 bit_offset_attribute (decl)
3232 HOST_WIDE_INT object_offset_in_bytes = field_byte_offset (decl);
3233 tree type = DECL_BIT_FIELD_TYPE (decl);
3234 HOST_WIDE_INT bitpos_int;
3235 HOST_WIDE_INT highest_order_object_bit_offset;
3236 HOST_WIDE_INT highest_order_field_bit_offset;
3237 HOST_WIDE_INT bit_offset;
3239 /* Must be a bit field. */
3241 || TREE_CODE (decl) != FIELD_DECL)
3244 /* We can't yet handle bit-fields whose offsets or sizes are variable, so
3245 if we encounter such things, just return without generating any
3246 attribute whatsoever. */
3248 if (! host_integerp (bit_position (decl), 0)
3249 || ! host_integerp (DECL_SIZE (decl), 1))
3252 bitpos_int = int_bit_position (decl);
3254 /* Note that the bit offset is always the distance (in bits) from the
3255 highest-order bit of the "containing object" to the highest-order
3256 bit of the bit-field itself. Since the "high-order end" of any
3257 object or field is different on big-endian and little-endian machines,
3258 the computation below must take account of these differences. */
3260 highest_order_object_bit_offset = object_offset_in_bytes * BITS_PER_UNIT;
3261 highest_order_field_bit_offset = bitpos_int;
3263 if (! BYTES_BIG_ENDIAN)
3265 highest_order_field_bit_offset += tree_low_cst (DECL_SIZE (decl), 1);
3266 highest_order_object_bit_offset += simple_type_size_in_bits (type);
3271 ? highest_order_object_bit_offset - highest_order_field_bit_offset
3272 : highest_order_field_bit_offset - highest_order_object_bit_offset);
3274 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_bit_offset);
3275 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, bit_offset);
3278 /* For a FIELD_DECL node which represents a bit field, output an attribute
3279 which specifies the length in bits of the given field. */
3282 bit_size_attribute (decl)
3285 /* Must be a field and a bit field. */
3286 if (TREE_CODE (decl) != FIELD_DECL
3287 || ! DECL_BIT_FIELD_TYPE (decl))
3290 if (host_integerp (DECL_SIZE (decl), 1))
3292 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_bit_size);
3293 ASM_OUTPUT_DWARF_DATA4 (asm_out_file,
3294 tree_low_cst (DECL_SIZE (decl), 1));
3298 /* The following routine outputs the `element_list' attribute for enumeration
3299 type DIEs. The element_lits attribute includes the names and values of
3300 all of the enumeration constants associated with the given enumeration
3304 element_list_attribute (element)
3305 register tree element;
3307 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
3308 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
3310 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_element_list);
3311 sprintf (begin_label, EE_BEGIN_LABEL_FMT, current_dienum);
3312 sprintf (end_label, EE_END_LABEL_FMT, current_dienum);
3313 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, end_label, begin_label);
3314 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
3316 /* Here we output a list of value/name pairs for each enumeration constant
3317 defined for this enumeration type (as required), but we do it in REVERSE
3318 order. The order is the one required by the draft #5 Dwarf specification
3319 published by the UI/PLSIG. */
3321 output_enumeral_list (element); /* Recursively output the whole list. */
3323 ASM_OUTPUT_LABEL (asm_out_file, end_label);
3326 /* Generate an AT_stmt_list attribute. These are normally present only in
3327 DIEs with a TAG_compile_unit tag. */
3330 stmt_list_attribute (label)
3331 register const char *label;
3333 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_stmt_list);
3334 /* Don't use ASM_OUTPUT_DWARF_DATA4 here. */
3335 ASM_OUTPUT_DWARF_ADDR (asm_out_file, label);
3338 /* Generate an AT_low_pc attribute for a label DIE, a lexical_block DIE or
3339 for a subroutine DIE. */
3342 low_pc_attribute (asm_low_label)
3343 register const char *asm_low_label;
3345 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_low_pc);
3346 ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_low_label);
3349 /* Generate an AT_high_pc attribute for a lexical_block DIE or for a
3353 high_pc_attribute (asm_high_label)
3354 register const char *asm_high_label;
3356 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_high_pc);
3357 ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_high_label);
3360 /* Generate an AT_body_begin attribute for a subroutine DIE. */
3363 body_begin_attribute (asm_begin_label)
3364 register const char *asm_begin_label;
3366 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_body_begin);
3367 ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_begin_label);
3370 /* Generate an AT_body_end attribute for a subroutine DIE. */
3373 body_end_attribute (asm_end_label)
3374 register const char *asm_end_label;
3376 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_body_end);
3377 ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_end_label);
3380 /* Generate an AT_language attribute given a LANG value. These attributes
3381 are used only within TAG_compile_unit DIEs. */
3384 language_attribute (language_code)
3385 register unsigned language_code;
3387 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_language);
3388 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, language_code);
3392 member_attribute (context)
3393 register tree context;
3395 char label[MAX_ARTIFICIAL_LABEL_BYTES];
3397 /* Generate this attribute only for members in C++. */
3399 if (context != NULL && is_tagged_type (context))
3401 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_member);
3402 sprintf (label, TYPE_NAME_FMT, TYPE_UID (context));
3403 ASM_OUTPUT_DWARF_REF (asm_out_file, label);
3409 string_length_attribute (upper_bound)
3410 register tree upper_bound;
3412 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
3413 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
3415 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_string_length);
3416 sprintf (begin_label, SL_BEGIN_LABEL_FMT, current_dienum);
3417 sprintf (end_label, SL_END_LABEL_FMT, current_dienum);
3418 ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label);
3419 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
3420 output_bound_representation (upper_bound, 0, 'u');
3421 ASM_OUTPUT_LABEL (asm_out_file, end_label);
3426 comp_dir_attribute (dirname)
3427 register const char *dirname;
3429 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_comp_dir);
3430 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, dirname);
3434 sf_names_attribute (sf_names_start_label)
3435 register const char *sf_names_start_label;
3437 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_sf_names);
3438 /* Don't use ASM_OUTPUT_DWARF_DATA4 here. */
3439 ASM_OUTPUT_DWARF_ADDR (asm_out_file, sf_names_start_label);
3443 src_info_attribute (src_info_start_label)
3444 register const char *src_info_start_label;
3446 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_src_info);
3447 /* Don't use ASM_OUTPUT_DWARF_DATA4 here. */
3448 ASM_OUTPUT_DWARF_ADDR (asm_out_file, src_info_start_label);
3452 mac_info_attribute (mac_info_start_label)
3453 register const char *mac_info_start_label;
3455 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_mac_info);
3456 /* Don't use ASM_OUTPUT_DWARF_DATA4 here. */
3457 ASM_OUTPUT_DWARF_ADDR (asm_out_file, mac_info_start_label);
3461 prototyped_attribute (func_type)
3462 register tree func_type;
3464 if ((strcmp (language_string, "GNU C") == 0)
3465 && (TYPE_ARG_TYPES (func_type) != NULL))
3467 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_prototyped);
3468 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
3473 producer_attribute (producer)
3474 register const char *producer;
3476 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_producer);
3477 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, producer);
3481 inline_attribute (decl)
3484 if (DECL_INLINE (decl))
3486 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_inline);
3487 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
3492 containing_type_attribute (containing_type)
3493 register tree containing_type;
3495 char label[MAX_ARTIFICIAL_LABEL_BYTES];
3497 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_containing_type);
3498 sprintf (label, TYPE_NAME_FMT, TYPE_UID (containing_type));
3499 ASM_OUTPUT_DWARF_REF (asm_out_file, label);
3503 abstract_origin_attribute (origin)
3504 register tree origin;
3506 char label[MAX_ARTIFICIAL_LABEL_BYTES];
3508 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_abstract_origin);
3509 switch (TREE_CODE_CLASS (TREE_CODE (origin)))
3512 sprintf (label, DECL_NAME_FMT, DECL_UID (origin));
3516 sprintf (label, TYPE_NAME_FMT, TYPE_UID (origin));
3520 abort (); /* Should never happen. */
3523 ASM_OUTPUT_DWARF_REF (asm_out_file, label);
3526 #ifdef DWARF_DECL_COORDINATES
3528 src_coords_attribute (src_fileno, src_lineno)
3529 register unsigned src_fileno;
3530 register unsigned src_lineno;
3532 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_src_coords);
3533 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, src_fileno);
3534 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, src_lineno);
3536 #endif /* defined(DWARF_DECL_COORDINATES) */
3539 pure_or_virtual_attribute (func_decl)
3540 register tree func_decl;
3542 if (DECL_VIRTUAL_P (func_decl))
3544 #if 0 /* DECL_ABSTRACT_VIRTUAL_P is C++-specific. */
3545 if (DECL_ABSTRACT_VIRTUAL_P (func_decl))
3546 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_pure_virtual);
3549 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_virtual);
3550 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
3554 /************************* end of attributes *****************************/
3556 /********************* utility routines for DIEs *************************/
3558 /* Output an AT_name attribute and an AT_src_coords attribute for the
3559 given decl, but only if it actually has a name. */
3562 name_and_src_coords_attributes (decl)
3565 register tree decl_name = DECL_NAME (decl);
3567 if (decl_name && IDENTIFIER_POINTER (decl_name))
3569 name_attribute (IDENTIFIER_POINTER (decl_name));
3570 #ifdef DWARF_DECL_COORDINATES
3572 register unsigned file_index;
3574 /* This is annoying, but we have to pop out of the .debug section
3575 for a moment while we call `lookup_filename' because calling it
3576 may cause a temporary switch into the .debug_sfnames section and
3577 most svr4 assemblers are not smart enough to be able to nest
3578 section switches to any depth greater than one. Note that we
3579 also can't skirt this issue by delaying all output to the
3580 .debug_sfnames section unit the end of compilation because that
3581 would cause us to have inter-section forward references and
3582 Fred Fish sez that m68k/svr4 assemblers botch those. */
3584 ASM_OUTPUT_POP_SECTION (asm_out_file);
3585 file_index = lookup_filename (DECL_SOURCE_FILE (decl));
3586 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SECTION);
3588 src_coords_attribute (file_index, DECL_SOURCE_LINE (decl));
3590 #endif /* defined(DWARF_DECL_COORDINATES) */
3594 /* Many forms of DIEs contain a "type description" part. The following
3595 routine writes out these "type descriptor" parts. */
3598 type_attribute (type, decl_const, decl_volatile)
3600 register int decl_const;
3601 register int decl_volatile;
3603 register enum tree_code code = TREE_CODE (type);
3604 register int root_type_modified;
3606 if (code == ERROR_MARK)
3609 /* Handle a special case. For functions whose return type is void,
3610 we generate *no* type attribute. (Note that no object may have
3611 type `void', so this only applies to function return types. */
3613 if (code == VOID_TYPE)
3616 /* If this is a subtype, find the underlying type. Eventually,
3617 this should write out the appropriate subtype info. */
3618 while ((code == INTEGER_TYPE || code == REAL_TYPE)
3619 && TREE_TYPE (type) != 0)
3620 type = TREE_TYPE (type), code = TREE_CODE (type);
3622 root_type_modified = (code == POINTER_TYPE || code == REFERENCE_TYPE
3623 || decl_const || decl_volatile
3624 || TYPE_READONLY (type) || TYPE_VOLATILE (type));
3626 if (type_is_fundamental (root_type (type)))
3628 if (root_type_modified)
3629 mod_fund_type_attribute (type, decl_const, decl_volatile);
3631 fund_type_attribute (fundamental_type_code (type));
3635 if (root_type_modified)
3636 mod_u_d_type_attribute (type, decl_const, decl_volatile);
3638 /* We have to get the type_main_variant here (and pass that to the
3639 `user_def_type_attribute' routine) because the ..._TYPE node we
3640 have might simply be a *copy* of some original type node (where
3641 the copy was created to help us keep track of typedef names)
3642 and that copy might have a different TYPE_UID from the original
3643 ..._TYPE node. (Note that when `equate_type_number_to_die_number'
3644 is labeling a given type DIE for future reference, it always and
3645 only creates labels for DIEs representing *main variants*, and it
3646 never even knows about non-main-variants.) */
3647 user_def_type_attribute (type_main_variant (type));
3651 /* Given a tree pointer to a struct, class, union, or enum type node, return
3652 a pointer to the (string) tag name for the given type, or zero if the
3653 type was declared without a tag. */
3659 register const char *name = 0;
3661 if (TYPE_NAME (type) != 0)
3663 register tree t = 0;
3665 /* Find the IDENTIFIER_NODE for the type name. */
3666 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
3667 t = TYPE_NAME (type);
3669 /* The g++ front end makes the TYPE_NAME of *each* tagged type point to
3670 a TYPE_DECL node, regardless of whether or not a `typedef' was
3672 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
3673 && ! DECL_IGNORED_P (TYPE_NAME (type)))
3674 t = DECL_NAME (TYPE_NAME (type));
3676 /* Now get the name as a string, or invent one. */
3678 name = IDENTIFIER_POINTER (t);
3681 return (name == 0 || *name == '\0') ? 0 : name;
3687 /* Start by checking if the pending_sibling_stack needs to be expanded.
3688 If necessary, expand it. */
3690 if (pending_siblings == pending_siblings_allocated)
3692 pending_siblings_allocated += PENDING_SIBLINGS_INCREMENT;
3693 pending_sibling_stack
3694 = (unsigned *) xrealloc (pending_sibling_stack,
3695 pending_siblings_allocated * sizeof(unsigned));
3699 NEXT_DIE_NUM = next_unused_dienum++;
3702 /* Pop the sibling stack so that the most recently pushed DIEnum becomes the
3712 member_declared_type (member)
3713 register tree member;
3715 return (DECL_BIT_FIELD_TYPE (member))
3716 ? DECL_BIT_FIELD_TYPE (member)
3717 : TREE_TYPE (member);
3720 /* Get the function's label, as described by its RTL.
3721 This may be different from the DECL_NAME name used
3722 in the source file. */
3725 function_start_label (decl)
3731 x = DECL_RTL (decl);
3732 if (GET_CODE (x) != MEM)
3735 if (GET_CODE (x) != SYMBOL_REF)
3737 fnname = XSTR (x, 0);
3742 /******************************* DIEs ************************************/
3744 /* Output routines for individual types of DIEs. */
3746 /* Note that every type of DIE (except a null DIE) gets a sibling. */
3749 output_array_type_die (arg)
3752 register tree type = arg;
3754 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_array_type);
3755 sibling_attribute ();
3756 equate_type_number_to_die_number (type);
3757 member_attribute (TYPE_CONTEXT (type));
3759 /* I believe that we can default the array ordering. SDB will probably
3760 do the right things even if AT_ordering is not present. It's not
3761 even an issue until we start to get into multidimensional arrays
3762 anyway. If SDB is ever caught doing the Wrong Thing for multi-
3763 dimensional arrays, then we'll have to put the AT_ordering attribute
3764 back in. (But if and when we find out that we need to put these in,
3765 we will only do so for multidimensional arrays. After all, we don't
3766 want to waste space in the .debug section now do we?) */
3768 #ifdef USE_ORDERING_ATTRIBUTE
3769 ordering_attribute (ORD_row_major);
3770 #endif /* defined(USE_ORDERING_ATTRIBUTE) */
3772 subscript_data_attribute (type);
3776 output_set_type_die (arg)
3779 register tree type = arg;
3781 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_set_type);
3782 sibling_attribute ();
3783 equate_type_number_to_die_number (type);
3784 member_attribute (TYPE_CONTEXT (type));
3785 type_attribute (TREE_TYPE (type), 0, 0);
3789 /* Implement this when there is a GNU FORTRAN or GNU Ada front end. */
3792 output_entry_point_die (arg)
3795 register tree decl = arg;
3796 register tree origin = decl_ultimate_origin (decl);
3798 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_entry_point);
3799 sibling_attribute ();
3802 abstract_origin_attribute (origin);
3805 name_and_src_coords_attributes (decl);
3806 member_attribute (DECL_CONTEXT (decl));
3807 type_attribute (TREE_TYPE (TREE_TYPE (decl)), 0, 0);
3809 if (DECL_ABSTRACT (decl))
3810 equate_decl_number_to_die_number (decl);
3812 low_pc_attribute (function_start_label (decl));
3816 /* Output a DIE to represent an inlined instance of an enumeration type. */
3819 output_inlined_enumeration_type_die (arg)
3822 register tree type = arg;
3824 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_enumeration_type);
3825 sibling_attribute ();
3826 if (!TREE_ASM_WRITTEN (type))
3828 abstract_origin_attribute (type);
3831 /* Output a DIE to represent an inlined instance of a structure type. */
3834 output_inlined_structure_type_die (arg)
3837 register tree type = arg;
3839 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_structure_type);
3840 sibling_attribute ();
3841 if (!TREE_ASM_WRITTEN (type))
3843 abstract_origin_attribute (type);
3846 /* Output a DIE to represent an inlined instance of a union type. */
3849 output_inlined_union_type_die (arg)
3852 register tree type = arg;
3854 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_union_type);
3855 sibling_attribute ();
3856 if (!TREE_ASM_WRITTEN (type))
3858 abstract_origin_attribute (type);
3861 /* Output a DIE to represent an enumeration type. Note that these DIEs
3862 include all of the information about the enumeration values also.
3863 This information is encoded into the element_list attribute. */
3866 output_enumeration_type_die (arg)
3869 register tree type = arg;
3871 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_enumeration_type);
3872 sibling_attribute ();
3873 equate_type_number_to_die_number (type);
3874 name_attribute (type_tag (type));
3875 member_attribute (TYPE_CONTEXT (type));
3877 /* Handle a GNU C/C++ extension, i.e. incomplete enum types. If the
3878 given enum type is incomplete, do not generate the AT_byte_size
3879 attribute or the AT_element_list attribute. */
3881 if (COMPLETE_TYPE_P (type))
3883 byte_size_attribute (type);
3884 element_list_attribute (TYPE_FIELDS (type));
3888 /* Output a DIE to represent either a real live formal parameter decl or
3889 to represent just the type of some formal parameter position in some
3892 Note that this routine is a bit unusual because its argument may be
3893 a ..._DECL node (i.e. either a PARM_DECL or perhaps a VAR_DECL which
3894 represents an inlining of some PARM_DECL) or else some sort of a
3895 ..._TYPE node. If it's the former then this function is being called
3896 to output a DIE to represent a formal parameter object (or some inlining
3897 thereof). If it's the latter, then this function is only being called
3898 to output a TAG_formal_parameter DIE to stand as a placeholder for some
3899 formal argument type of some subprogram type. */
3902 output_formal_parameter_die (arg)
3905 register tree node = arg;
3907 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_formal_parameter);
3908 sibling_attribute ();
3910 switch (TREE_CODE_CLASS (TREE_CODE (node)))
3912 case 'd': /* We were called with some kind of a ..._DECL node. */
3914 register tree origin = decl_ultimate_origin (node);
3917 abstract_origin_attribute (origin);
3920 name_and_src_coords_attributes (node);
3921 type_attribute (TREE_TYPE (node),
3922 TREE_READONLY (node), TREE_THIS_VOLATILE (node));
3924 if (DECL_ABSTRACT (node))
3925 equate_decl_number_to_die_number (node);
3927 location_or_const_value_attribute (node);
3931 case 't': /* We were called with some kind of a ..._TYPE node. */
3932 type_attribute (node, 0, 0);
3936 abort (); /* Should never happen. */
3940 /* Output a DIE to represent a declared function (either file-scope
3941 or block-local) which has "external linkage" (according to ANSI-C). */
3944 output_global_subroutine_die (arg)
3947 register tree decl = arg;
3948 register tree origin = decl_ultimate_origin (decl);
3950 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_global_subroutine);
3951 sibling_attribute ();
3954 abstract_origin_attribute (origin);
3957 register tree type = TREE_TYPE (decl);
3959 name_and_src_coords_attributes (decl);
3960 inline_attribute (decl);
3961 prototyped_attribute (type);
3962 member_attribute (DECL_CONTEXT (decl));
3963 type_attribute (TREE_TYPE (type), 0, 0);
3964 pure_or_virtual_attribute (decl);
3966 if (DECL_ABSTRACT (decl))
3967 equate_decl_number_to_die_number (decl);
3970 if (! DECL_EXTERNAL (decl) && ! in_class
3971 && decl == current_function_decl)
3973 char label[MAX_ARTIFICIAL_LABEL_BYTES];
3975 low_pc_attribute (function_start_label (decl));
3976 sprintf (label, FUNC_END_LABEL_FMT, current_funcdef_number);
3977 high_pc_attribute (label);
3978 if (use_gnu_debug_info_extensions)
3980 sprintf (label, BODY_BEGIN_LABEL_FMT, current_funcdef_number);
3981 body_begin_attribute (label);
3982 sprintf (label, BODY_END_LABEL_FMT, current_funcdef_number);
3983 body_end_attribute (label);
3989 /* Output a DIE to represent a declared data object (either file-scope
3990 or block-local) which has "external linkage" (according to ANSI-C). */
3993 output_global_variable_die (arg)
3996 register tree decl = arg;
3997 register tree origin = decl_ultimate_origin (decl);
3999 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_global_variable);
4000 sibling_attribute ();
4002 abstract_origin_attribute (origin);
4005 name_and_src_coords_attributes (decl);
4006 member_attribute (DECL_CONTEXT (decl));
4007 type_attribute (TREE_TYPE (decl),
4008 TREE_READONLY (decl), TREE_THIS_VOLATILE (decl));
4010 if (DECL_ABSTRACT (decl))
4011 equate_decl_number_to_die_number (decl);
4014 if (! DECL_EXTERNAL (decl) && ! in_class
4015 && current_function_decl == decl_function_context (decl))
4016 location_or_const_value_attribute (decl);
4021 output_label_die (arg)
4024 register tree decl = arg;
4025 register tree origin = decl_ultimate_origin (decl);
4027 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_label);
4028 sibling_attribute ();
4030 abstract_origin_attribute (origin);
4032 name_and_src_coords_attributes (decl);
4033 if (DECL_ABSTRACT (decl))
4034 equate_decl_number_to_die_number (decl);
4037 register rtx insn = DECL_RTL (decl);
4039 /* Deleted labels are programmer specified labels which have been
4040 eliminated because of various optimisations. We still emit them
4041 here so that it is possible to put breakpoints on them. */
4042 if (GET_CODE (insn) == CODE_LABEL
4043 || ((GET_CODE (insn) == NOTE
4044 && NOTE_LINE_NUMBER (insn) == NOTE_INSN_DELETED_LABEL)))
4046 char label[MAX_ARTIFICIAL_LABEL_BYTES];
4048 /* When optimization is enabled (via -O) some parts of the compiler
4049 (e.g. jump.c and cse.c) may try to delete CODE_LABEL insns which
4050 represent source-level labels which were explicitly declared by
4051 the user. This really shouldn't be happening though, so catch
4052 it if it ever does happen. */
4054 if (INSN_DELETED_P (insn))
4055 abort (); /* Should never happen. */
4057 ASM_GENERATE_INTERNAL_LABEL (label, "L", CODE_LABEL_NUMBER (insn));
4058 low_pc_attribute (label);
4064 output_lexical_block_die (arg)
4067 register tree stmt = arg;
4069 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_lexical_block);
4070 sibling_attribute ();
4072 if (! BLOCK_ABSTRACT (stmt))
4074 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
4075 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
4077 sprintf (begin_label, BLOCK_BEGIN_LABEL_FMT, BLOCK_NUMBER (stmt));
4078 low_pc_attribute (begin_label);
4079 sprintf (end_label, BLOCK_END_LABEL_FMT, BLOCK_NUMBER (stmt));
4080 high_pc_attribute (end_label);
4085 output_inlined_subroutine_die (arg)
4088 register tree stmt = arg;
4090 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_inlined_subroutine);
4091 sibling_attribute ();
4093 abstract_origin_attribute (block_ultimate_origin (stmt));
4094 if (! BLOCK_ABSTRACT (stmt))
4096 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
4097 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
4099 sprintf (begin_label, BLOCK_BEGIN_LABEL_FMT, BLOCK_NUMBER (stmt));
4100 low_pc_attribute (begin_label);
4101 sprintf (end_label, BLOCK_END_LABEL_FMT, BLOCK_NUMBER (stmt));
4102 high_pc_attribute (end_label);
4106 /* Output a DIE to represent a declared data object (either file-scope
4107 or block-local) which has "internal linkage" (according to ANSI-C). */
4110 output_local_variable_die (arg)
4113 register tree decl = arg;
4114 register tree origin = decl_ultimate_origin (decl);
4116 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_local_variable);
4117 sibling_attribute ();
4119 abstract_origin_attribute (origin);
4122 name_and_src_coords_attributes (decl);
4123 member_attribute (DECL_CONTEXT (decl));
4124 type_attribute (TREE_TYPE (decl),
4125 TREE_READONLY (decl), TREE_THIS_VOLATILE (decl));
4127 if (DECL_ABSTRACT (decl))
4128 equate_decl_number_to_die_number (decl);
4130 location_or_const_value_attribute (decl);
4134 output_member_die (arg)
4137 register tree decl = arg;
4139 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_member);
4140 sibling_attribute ();
4141 name_and_src_coords_attributes (decl);
4142 member_attribute (DECL_CONTEXT (decl));
4143 type_attribute (member_declared_type (decl),
4144 TREE_READONLY (decl), TREE_THIS_VOLATILE (decl));
4145 if (DECL_BIT_FIELD_TYPE (decl)) /* If this is a bit field... */
4147 byte_size_attribute (decl);
4148 bit_size_attribute (decl);
4149 bit_offset_attribute (decl);
4151 data_member_location_attribute (decl);
4155 /* Don't generate either pointer_type DIEs or reference_type DIEs. Use
4156 modified types instead.
4158 We keep this code here just in case these types of DIEs may be
4159 needed to represent certain things in other languages (e.g. Pascal)
4163 output_pointer_type_die (arg)
4166 register tree type = arg;
4168 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_pointer_type);
4169 sibling_attribute ();
4170 equate_type_number_to_die_number (type);
4171 member_attribute (TYPE_CONTEXT (type));
4172 type_attribute (TREE_TYPE (type), 0, 0);
4176 output_reference_type_die (arg)
4179 register tree type = arg;
4181 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_reference_type);
4182 sibling_attribute ();
4183 equate_type_number_to_die_number (type);
4184 member_attribute (TYPE_CONTEXT (type));
4185 type_attribute (TREE_TYPE (type), 0, 0);
4190 output_ptr_to_mbr_type_die (arg)
4193 register tree type = arg;
4195 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_ptr_to_member_type);
4196 sibling_attribute ();
4197 equate_type_number_to_die_number (type);
4198 member_attribute (TYPE_CONTEXT (type));
4199 containing_type_attribute (TYPE_OFFSET_BASETYPE (type));
4200 type_attribute (TREE_TYPE (type), 0, 0);
4204 output_compile_unit_die (arg)
4207 register const char *main_input_filename = arg;
4209 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_compile_unit);
4210 sibling_attribute ();
4212 name_attribute (main_input_filename);
4217 sprintf (producer, "%s %s", language_string, version_string);
4218 producer_attribute (producer);
4221 if (strcmp (language_string, "GNU C++") == 0)
4222 language_attribute (LANG_C_PLUS_PLUS);
4223 else if (strcmp (language_string, "GNU Ada") == 0)
4224 language_attribute (LANG_ADA83);
4225 else if (strcmp (language_string, "GNU F77") == 0)
4226 language_attribute (LANG_FORTRAN77);
4227 else if (strcmp (language_string, "GNU Pascal") == 0)
4228 language_attribute (LANG_PASCAL83);
4229 else if (strcmp (language_string, "GNU Java") == 0)
4230 language_attribute (LANG_JAVA);
4231 else if (flag_traditional)
4232 language_attribute (LANG_C);
4234 language_attribute (LANG_C89);
4235 low_pc_attribute (TEXT_BEGIN_LABEL);
4236 high_pc_attribute (TEXT_END_LABEL);
4237 if (debug_info_level >= DINFO_LEVEL_NORMAL)
4238 stmt_list_attribute (LINE_BEGIN_LABEL);
4239 last_filename = xstrdup (main_input_filename);
4242 const char *wd = getpwd ();
4244 comp_dir_attribute (wd);
4247 if (debug_info_level >= DINFO_LEVEL_NORMAL && use_gnu_debug_info_extensions)
4249 sf_names_attribute (SFNAMES_BEGIN_LABEL);
4250 src_info_attribute (SRCINFO_BEGIN_LABEL);
4251 if (debug_info_level >= DINFO_LEVEL_VERBOSE)
4252 mac_info_attribute (MACINFO_BEGIN_LABEL);
4257 output_string_type_die (arg)
4260 register tree type = arg;
4262 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_string_type);
4263 sibling_attribute ();
4264 equate_type_number_to_die_number (type);
4265 member_attribute (TYPE_CONTEXT (type));
4266 /* this is a fixed length string */
4267 byte_size_attribute (type);
4271 output_inheritance_die (arg)
4274 register tree binfo = arg;
4276 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_inheritance);
4277 sibling_attribute ();
4278 type_attribute (BINFO_TYPE (binfo), 0, 0);
4279 data_member_location_attribute (binfo);
4280 if (TREE_VIA_VIRTUAL (binfo))
4282 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_virtual);
4283 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
4285 if (TREE_VIA_PUBLIC (binfo))
4287 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_public);
4288 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
4290 else if (TREE_VIA_PROTECTED (binfo))
4292 ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_protected);
4293 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
4298 output_structure_type_die (arg)
4301 register tree type = arg;
4303 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_structure_type);
4304 sibling_attribute ();
4305 equate_type_number_to_die_number (type);
4306 name_attribute (type_tag (type));
4307 member_attribute (TYPE_CONTEXT (type));
4309 /* If this type has been completed, then give it a byte_size attribute
4310 and prepare to give a list of members. Otherwise, don't do either of
4311 these things. In the latter case, we will not be generating a list
4312 of members (since we don't have any idea what they might be for an
4313 incomplete type). */
4315 if (COMPLETE_TYPE_P (type))
4318 byte_size_attribute (type);
4322 /* Output a DIE to represent a declared function (either file-scope
4323 or block-local) which has "internal linkage" (according to ANSI-C). */
4326 output_local_subroutine_die (arg)
4329 register tree decl = arg;
4330 register tree origin = decl_ultimate_origin (decl);
4332 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_subroutine);
4333 sibling_attribute ();
4336 abstract_origin_attribute (origin);
4339 register tree type = TREE_TYPE (decl);
4341 name_and_src_coords_attributes (decl);
4342 inline_attribute (decl);
4343 prototyped_attribute (type);
4344 member_attribute (DECL_CONTEXT (decl));
4345 type_attribute (TREE_TYPE (type), 0, 0);
4346 pure_or_virtual_attribute (decl);
4348 if (DECL_ABSTRACT (decl))
4349 equate_decl_number_to_die_number (decl);
4352 /* Avoid getting screwed up in cases where a function was declared
4353 static but where no definition was ever given for it. */
4355 if (TREE_ASM_WRITTEN (decl))
4357 char label[MAX_ARTIFICIAL_LABEL_BYTES];
4358 low_pc_attribute (function_start_label (decl));
4359 sprintf (label, FUNC_END_LABEL_FMT, current_funcdef_number);
4360 high_pc_attribute (label);
4361 if (use_gnu_debug_info_extensions)
4363 sprintf (label, BODY_BEGIN_LABEL_FMT, current_funcdef_number);
4364 body_begin_attribute (label);
4365 sprintf (label, BODY_END_LABEL_FMT, current_funcdef_number);
4366 body_end_attribute (label);
4373 output_subroutine_type_die (arg)
4376 register tree type = arg;
4377 register tree return_type = TREE_TYPE (type);
4379 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_subroutine_type);
4380 sibling_attribute ();
4382 equate_type_number_to_die_number (type);
4383 prototyped_attribute (type);
4384 member_attribute (TYPE_CONTEXT (type));
4385 type_attribute (return_type, 0, 0);
4389 output_typedef_die (arg)
4392 register tree decl = arg;
4393 register tree origin = decl_ultimate_origin (decl);
4395 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_typedef);
4396 sibling_attribute ();
4398 abstract_origin_attribute (origin);
4401 name_and_src_coords_attributes (decl);
4402 member_attribute (DECL_CONTEXT (decl));
4403 type_attribute (TREE_TYPE (decl),
4404 TREE_READONLY (decl), TREE_THIS_VOLATILE (decl));
4406 if (DECL_ABSTRACT (decl))
4407 equate_decl_number_to_die_number (decl);
4411 output_union_type_die (arg)
4414 register tree type = arg;
4416 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_union_type);
4417 sibling_attribute ();
4418 equate_type_number_to_die_number (type);
4419 name_attribute (type_tag (type));
4420 member_attribute (TYPE_CONTEXT (type));
4422 /* If this type has been completed, then give it a byte_size attribute
4423 and prepare to give a list of members. Otherwise, don't do either of
4424 these things. In the latter case, we will not be generating a list
4425 of members (since we don't have any idea what they might be for an
4426 incomplete type). */
4428 if (COMPLETE_TYPE_P (type))
4431 byte_size_attribute (type);
4435 /* Generate a special type of DIE used as a stand-in for a trailing ellipsis
4436 at the end of an (ANSI prototyped) formal parameters list. */
4439 output_unspecified_parameters_die (arg)
4442 register tree decl_or_type = arg;
4444 ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_unspecified_parameters);
4445 sibling_attribute ();
4447 /* This kludge is here only for the sake of being compatible with what
4448 the USL CI5 C compiler does. The specification of Dwarf Version 1
4449 doesn't say that TAG_unspecified_parameters DIEs should contain any
4450 attributes other than the AT_sibling attribute, but they are certainly
4451 allowed to contain additional attributes, and the CI5 compiler
4452 generates AT_name, AT_fund_type, and AT_location attributes within
4453 TAG_unspecified_parameters DIEs which appear in the child lists for
4454 DIEs representing function definitions, so we do likewise here. */
4456 if (TREE_CODE (decl_or_type) == FUNCTION_DECL && DECL_INITIAL (decl_or_type))
4458 name_attribute ("...");
4459 fund_type_attribute (FT_pointer);
4460 /* location_attribute (?); */
4465 output_padded_null_die (arg)
4466 register void *arg ATTRIBUTE_UNUSED;
4468 ASM_OUTPUT_ALIGN (asm_out_file, 2); /* 2**2 == 4 */
4471 /*************************** end of DIEs *********************************/
4473 /* Generate some type of DIE. This routine generates the generic outer
4474 wrapper stuff which goes around all types of DIE's (regardless of their
4475 TAGs. All forms of DIEs start with a DIE-specific label, followed by a
4476 DIE-length word, followed by the guts of the DIE itself. After the guts
4477 of the DIE, there must always be a terminator label for the DIE. */
4480 output_die (die_specific_output_function, param)
4481 register void (*die_specific_output_function) PARAMS ((void *));
4482 register void *param;
4484 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
4485 char end_label[MAX_ARTIFICIAL_LABEL_BYTES];
4487 current_dienum = NEXT_DIE_NUM;
4488 NEXT_DIE_NUM = next_unused_dienum;
4490 sprintf (begin_label, DIE_BEGIN_LABEL_FMT, current_dienum);
4491 sprintf (end_label, DIE_END_LABEL_FMT, current_dienum);
4493 /* Write a label which will act as the name for the start of this DIE. */
4495 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
4497 /* Write the DIE-length word. */
4499 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, end_label, begin_label);
4501 /* Fill in the guts of the DIE. */
4503 next_unused_dienum++;
4504 die_specific_output_function (param);
4506 /* Write a label which will act as the name for the end of this DIE. */
4508 ASM_OUTPUT_LABEL (asm_out_file, end_label);
4512 end_sibling_chain ()
4514 char begin_label[MAX_ARTIFICIAL_LABEL_BYTES];
4516 current_dienum = NEXT_DIE_NUM;
4517 NEXT_DIE_NUM = next_unused_dienum;
4519 sprintf (begin_label, DIE_BEGIN_LABEL_FMT, current_dienum);
4521 /* Write a label which will act as the name for the start of this DIE. */
4523 ASM_OUTPUT_LABEL (asm_out_file, begin_label);
4525 /* Write the DIE-length word. */
4527 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 4);
4532 /* Generate a list of nameless TAG_formal_parameter DIEs (and perhaps a
4533 TAG_unspecified_parameters DIE) to represent the types of the formal
4534 parameters as specified in some function type specification (except
4535 for those which appear as part of a function *definition*).
4537 Note that we must be careful here to output all of the parameter
4538 DIEs *before* we output any DIEs needed to represent the types of
4539 the formal parameters. This keeps svr4 SDB happy because it
4540 (incorrectly) thinks that the first non-parameter DIE it sees ends
4541 the formal parameter list. */
4544 output_formal_types (function_or_method_type)
4545 register tree function_or_method_type;
4548 register tree formal_type = NULL;
4549 register tree first_parm_type = TYPE_ARG_TYPES (function_or_method_type);
4551 /* Set TREE_ASM_WRITTEN while processing the parameters, lest we
4552 get bogus recursion when outputting tagged types local to a
4553 function declaration. */
4554 int save_asm_written = TREE_ASM_WRITTEN (function_or_method_type);
4555 TREE_ASM_WRITTEN (function_or_method_type) = 1;
4557 /* In the case where we are generating a formal types list for a C++
4558 non-static member function type, skip over the first thing on the
4559 TYPE_ARG_TYPES list because it only represents the type of the
4560 hidden `this pointer'. The debugger should be able to figure
4561 out (without being explicitly told) that this non-static member
4562 function type takes a `this pointer' and should be able to figure
4563 what the type of that hidden parameter is from the AT_member
4564 attribute of the parent TAG_subroutine_type DIE. */
4566 if (TREE_CODE (function_or_method_type) == METHOD_TYPE)
4567 first_parm_type = TREE_CHAIN (first_parm_type);
4569 /* Make our first pass over the list of formal parameter types and output
4570 a TAG_formal_parameter DIE for each one. */
4572 for (link = first_parm_type; link; link = TREE_CHAIN (link))
4574 formal_type = TREE_VALUE (link);
4575 if (formal_type == void_type_node)
4578 /* Output a (nameless) DIE to represent the formal parameter itself. */
4580 output_die (output_formal_parameter_die, formal_type);
4583 /* If this function type has an ellipsis, add a TAG_unspecified_parameters
4584 DIE to the end of the parameter list. */
4586 if (formal_type != void_type_node)
4587 output_die (output_unspecified_parameters_die, function_or_method_type);
4589 /* Make our second (and final) pass over the list of formal parameter types
4590 and output DIEs to represent those types (as necessary). */
4592 for (link = TYPE_ARG_TYPES (function_or_method_type);
4594 link = TREE_CHAIN (link))
4596 formal_type = TREE_VALUE (link);
4597 if (formal_type == void_type_node)
4600 output_type (formal_type, function_or_method_type);
4603 TREE_ASM_WRITTEN (function_or_method_type) = save_asm_written;
4606 /* Remember a type in the pending_types_list. */
4612 if (pending_types == pending_types_allocated)
4614 pending_types_allocated += PENDING_TYPES_INCREMENT;
4616 = (tree *) xrealloc (pending_types_list,
4617 sizeof (tree) * pending_types_allocated);
4619 pending_types_list[pending_types++] = type;
4621 /* Mark the pending type as having been output already (even though
4622 it hasn't been). This prevents the type from being added to the
4623 pending_types_list more than once. */
4625 TREE_ASM_WRITTEN (type) = 1;
4628 /* Return non-zero if it is legitimate to output DIEs to represent a
4629 given type while we are generating the list of child DIEs for some
4630 DIE (e.g. a function or lexical block DIE) associated with a given scope.
4632 See the comments within the function for a description of when it is
4633 considered legitimate to output DIEs for various kinds of types.
4635 Note that TYPE_CONTEXT(type) may be NULL (to indicate global scope)
4636 or it may point to a BLOCK node (for types local to a block), or to a
4637 FUNCTION_DECL node (for types local to the heading of some function
4638 definition), or to a FUNCTION_TYPE node (for types local to the
4639 prototyped parameter list of a function type specification), or to a
4640 RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE node
4641 (in the case of C++ nested types).
4643 The `scope' parameter should likewise be NULL or should point to a
4644 BLOCK node, a FUNCTION_DECL node, a FUNCTION_TYPE node, a RECORD_TYPE
4645 node, a UNION_TYPE node, or a QUAL_UNION_TYPE node.
4647 This function is used only for deciding when to "pend" and when to
4648 "un-pend" types to/from the pending_types_list.
4650 Note that we sometimes make use of this "type pending" feature in a
4651 rather twisted way to temporarily delay the production of DIEs for the
4652 types of formal parameters. (We do this just to make svr4 SDB happy.)
4653 It order to delay the production of DIEs representing types of formal
4654 parameters, callers of this function supply `fake_containing_scope' as
4655 the `scope' parameter to this function. Given that fake_containing_scope
4656 is a tagged type which is *not* the containing scope for *any* other type,
4657 the desired effect is achieved, i.e. output of DIEs representing types
4658 is temporarily suspended, and any type DIEs which would have otherwise
4659 been output are instead placed onto the pending_types_list. Later on,
4660 we force these (temporarily pended) types to be output simply by calling
4661 `output_pending_types_for_scope' with an actual argument equal to the
4662 true scope of the types we temporarily pended. */
4665 type_ok_for_scope (type, scope)
4667 register tree scope;
4669 /* Tagged types (i.e. struct, union, and enum types) must always be
4670 output only in the scopes where they actually belong (or else the
4671 scoping of their own tag names and the scoping of their member
4672 names will be incorrect). Non-tagged-types on the other hand can
4673 generally be output anywhere, except that svr4 SDB really doesn't
4674 want to see them nested within struct or union types, so here we
4675 say it is always OK to immediately output any such a (non-tagged)
4676 type, so long as we are not within such a context. Note that the
4677 only kinds of non-tagged types which we will be dealing with here
4678 (for C and C++ anyway) will be array types and function types. */
4680 return is_tagged_type (type)
4681 ? (TYPE_CONTEXT (type) == scope
4682 /* Ignore namespaces for the moment. */
4683 || (scope == NULL_TREE
4684 && TREE_CODE (TYPE_CONTEXT (type)) == NAMESPACE_DECL)
4685 || (scope == NULL_TREE && is_tagged_type (TYPE_CONTEXT (type))
4686 && TREE_ASM_WRITTEN (TYPE_CONTEXT (type))))
4687 : (scope == NULL_TREE || ! is_tagged_type (scope));
4690 /* Output any pending types (from the pending_types list) which we can output
4691 now (taking into account the scope that we are working on now).
4693 For each type output, remove the given type from the pending_types_list
4694 *before* we try to output it.
4696 Note that we have to process the list in beginning-to-end order,
4697 because the call made here to output_type may cause yet more types
4698 to be added to the end of the list, and we may have to output some
4702 output_pending_types_for_scope (containing_scope)
4703 register tree containing_scope;
4705 register unsigned i;
4707 for (i = 0; i < pending_types; )
4709 register tree type = pending_types_list[i];
4711 if (type_ok_for_scope (type, containing_scope))
4713 register tree *mover;
4714 register tree *limit;
4717 limit = &pending_types_list[pending_types];
4718 for (mover = &pending_types_list[i]; mover < limit; mover++)
4719 *mover = *(mover+1);
4721 /* Un-mark the type as having been output already (because it
4722 hasn't been, really). Then call output_type to generate a
4723 Dwarf representation of it. */
4725 TREE_ASM_WRITTEN (type) = 0;
4726 output_type (type, containing_scope);
4728 /* Don't increment the loop counter in this case because we
4729 have shifted all of the subsequent pending types down one
4730 element in the pending_types_list array. */
4737 /* Remember a type in the incomplete_types_list. */
4740 add_incomplete_type (type)
4743 if (incomplete_types == incomplete_types_allocated)
4745 incomplete_types_allocated += INCOMPLETE_TYPES_INCREMENT;
4746 incomplete_types_list
4747 = (tree *) xrealloc (incomplete_types_list,
4748 sizeof (tree) * incomplete_types_allocated);
4751 incomplete_types_list[incomplete_types++] = type;
4754 /* Walk through the list of incomplete types again, trying once more to
4755 emit full debugging info for them. */
4758 retry_incomplete_types ()
4763 while (incomplete_types)
4766 type = incomplete_types_list[incomplete_types];
4767 output_type (type, NULL_TREE);
4772 output_type (type, containing_scope)
4774 register tree containing_scope;
4776 if (type == 0 || type == error_mark_node)
4779 /* We are going to output a DIE to represent the unqualified version of
4780 this type (i.e. without any const or volatile qualifiers) so get
4781 the main variant (i.e. the unqualified version) of this type now. */
4783 type = type_main_variant (type);
4785 if (TREE_ASM_WRITTEN (type))
4787 if (finalizing && AGGREGATE_TYPE_P (type))
4789 register tree member;
4791 /* Some of our nested types might not have been defined when we
4792 were written out before; force them out now. */
4794 for (member = TYPE_FIELDS (type); member;
4795 member = TREE_CHAIN (member))
4796 if (TREE_CODE (member) == TYPE_DECL
4797 && ! TREE_ASM_WRITTEN (TREE_TYPE (member)))
4798 output_type (TREE_TYPE (member), containing_scope);
4803 /* If this is a nested type whose containing class hasn't been
4804 written out yet, writing it out will cover this one, too. */
4806 if (TYPE_CONTEXT (type)
4807 && TYPE_P (TYPE_CONTEXT (type))
4808 && ! TREE_ASM_WRITTEN (TYPE_CONTEXT (type)))
4810 output_type (TYPE_CONTEXT (type), containing_scope);
4814 /* Don't generate any DIEs for this type now unless it is OK to do so
4815 (based upon what `type_ok_for_scope' tells us). */
4817 if (! type_ok_for_scope (type, containing_scope))
4823 switch (TREE_CODE (type))
4829 output_type (TYPE_DEBUG_REPRESENTATION_TYPE (type), containing_scope);
4833 case REFERENCE_TYPE:
4834 /* Prevent infinite recursion in cases where this is a recursive
4835 type. Recursive types are possible in Ada. */
4836 TREE_ASM_WRITTEN (type) = 1;
4837 /* For these types, all that is required is that we output a DIE
4838 (or a set of DIEs) to represent the "basis" type. */
4839 output_type (TREE_TYPE (type), containing_scope);
4843 /* This code is used for C++ pointer-to-data-member types. */
4844 /* Output a description of the relevant class type. */
4845 output_type (TYPE_OFFSET_BASETYPE (type), containing_scope);
4846 /* Output a description of the type of the object pointed to. */
4847 output_type (TREE_TYPE (type), containing_scope);
4848 /* Now output a DIE to represent this pointer-to-data-member type
4850 output_die (output_ptr_to_mbr_type_die, type);
4854 output_type (TYPE_DOMAIN (type), containing_scope);
4855 output_die (output_set_type_die, type);
4859 output_type (TREE_TYPE (type), containing_scope);
4860 abort (); /* No way to represent these in Dwarf yet! */
4864 /* Force out return type (in case it wasn't forced out already). */
4865 output_type (TREE_TYPE (type), containing_scope);
4866 output_die (output_subroutine_type_die, type);
4867 output_formal_types (type);
4868 end_sibling_chain ();
4872 /* Force out return type (in case it wasn't forced out already). */
4873 output_type (TREE_TYPE (type), containing_scope);
4874 output_die (output_subroutine_type_die, type);
4875 output_formal_types (type);
4876 end_sibling_chain ();
4880 if (TYPE_STRING_FLAG (type) && TREE_CODE(TREE_TYPE(type)) == CHAR_TYPE)
4882 output_type (TREE_TYPE (type), containing_scope);
4883 output_die (output_string_type_die, type);
4887 register tree element_type;
4889 element_type = TREE_TYPE (type);
4890 while (TREE_CODE (element_type) == ARRAY_TYPE)
4891 element_type = TREE_TYPE (element_type);
4893 output_type (element_type, containing_scope);
4894 output_die (output_array_type_die, type);
4901 case QUAL_UNION_TYPE:
4903 /* For a non-file-scope tagged type, we can always go ahead and
4904 output a Dwarf description of this type right now, even if
4905 the type in question is still incomplete, because if this
4906 local type *was* ever completed anywhere within its scope,
4907 that complete definition would already have been attached to
4908 this RECORD_TYPE, UNION_TYPE, QUAL_UNION_TYPE or ENUMERAL_TYPE
4909 node by the time we reach this point. That's true because of the
4910 way the front-end does its processing of file-scope declarations (of
4911 functions and class types) within which other types might be
4912 nested. The C and C++ front-ends always gobble up such "local
4913 scope" things en-mass before they try to output *any* debugging
4914 information for any of the stuff contained inside them and thus,
4915 we get the benefit here of what is (in effect) a pre-resolution
4916 of forward references to tagged types in local scopes.
4918 Note however that for file-scope tagged types we cannot assume
4919 that such pre-resolution of forward references has taken place.
4920 A given file-scope tagged type may appear to be incomplete when
4921 we reach this point, but it may yet be given a full definition
4922 (at file-scope) later on during compilation. In order to avoid
4923 generating a premature (and possibly incorrect) set of Dwarf
4924 DIEs for such (as yet incomplete) file-scope tagged types, we
4925 generate nothing at all for as-yet incomplete file-scope tagged
4926 types here unless we are making our special "finalization" pass
4927 for file-scope things at the very end of compilation. At that
4928 time, we will certainly know as much about each file-scope tagged
4929 type as we are ever going to know, so at that point in time, we
4930 can safely generate correct Dwarf descriptions for these file-
4931 scope tagged types. */
4933 if (!COMPLETE_TYPE_P (type)
4934 && (TYPE_CONTEXT (type) == NULL
4935 || AGGREGATE_TYPE_P (TYPE_CONTEXT (type))
4936 || TREE_CODE (TYPE_CONTEXT (type)) == NAMESPACE_DECL)
4939 /* We don't need to do this for function-local types. */
4940 if (! decl_function_context (TYPE_STUB_DECL (type)))
4941 add_incomplete_type (type);
4942 return; /* EARLY EXIT! Avoid setting TREE_ASM_WRITTEN. */
4945 /* Prevent infinite recursion in cases where the type of some
4946 member of this type is expressed in terms of this type itself. */
4948 TREE_ASM_WRITTEN (type) = 1;
4950 /* Output a DIE to represent the tagged type itself. */
4952 switch (TREE_CODE (type))
4955 output_die (output_enumeration_type_die, type);
4956 return; /* a special case -- nothing left to do so just return */
4959 output_die (output_structure_type_die, type);
4963 case QUAL_UNION_TYPE:
4964 output_die (output_union_type_die, type);
4968 abort (); /* Should never happen. */
4971 /* If this is not an incomplete type, output descriptions of
4972 each of its members.
4974 Note that as we output the DIEs necessary to represent the
4975 members of this record or union type, we will also be trying
4976 to output DIEs to represent the *types* of those members.
4977 However the `output_type' function (above) will specifically
4978 avoid generating type DIEs for member types *within* the list
4979 of member DIEs for this (containing) type execpt for those
4980 types (of members) which are explicitly marked as also being
4981 members of this (containing) type themselves. The g++ front-
4982 end can force any given type to be treated as a member of some
4983 other (containing) type by setting the TYPE_CONTEXT of the
4984 given (member) type to point to the TREE node representing the
4985 appropriate (containing) type.
4988 if (COMPLETE_TYPE_P (type))
4990 /* First output info about the base classes. */
4991 if (TYPE_BINFO (type) && TYPE_BINFO_BASETYPES (type))
4993 register tree bases = TYPE_BINFO_BASETYPES (type);
4994 register int n_bases = TREE_VEC_LENGTH (bases);
4997 for (i = 0; i < n_bases; i++)
4999 tree binfo = TREE_VEC_ELT (bases, i);
5000 output_type (BINFO_TYPE (binfo), containing_scope);
5001 output_die (output_inheritance_die, binfo);
5008 register tree normal_member;
5010 /* Now output info about the data members and type members. */
5012 for (normal_member = TYPE_FIELDS (type);
5014 normal_member = TREE_CHAIN (normal_member))
5015 output_decl (normal_member, type);
5019 register tree func_member;
5021 /* Now output info about the function members (if any). */
5023 for (func_member = TYPE_METHODS (type);
5025 func_member = TREE_CHAIN (func_member))
5027 /* Don't include clones in the member list. */
5028 if (DECL_ABSTRACT_ORIGIN (func_member))
5031 output_decl (func_member, type);
5037 /* RECORD_TYPEs, UNION_TYPEs, and QUAL_UNION_TYPEs are themselves
5038 scopes (at least in C++) so we must now output any nested
5039 pending types which are local just to this type. */
5041 output_pending_types_for_scope (type);
5043 end_sibling_chain (); /* Terminate member chain. */
5054 break; /* No DIEs needed for fundamental types. */
5056 case LANG_TYPE: /* No Dwarf representation currently defined. */
5063 TREE_ASM_WRITTEN (type) = 1;
5067 output_tagged_type_instantiation (type)
5070 if (type == 0 || type == error_mark_node)
5073 /* We are going to output a DIE to represent the unqualified version of
5074 this type (i.e. without any const or volatile qualifiers) so make
5075 sure that we have the main variant (i.e. the unqualified version) of
5078 if (type != type_main_variant (type))
5081 if (!TREE_ASM_WRITTEN (type))
5084 switch (TREE_CODE (type))
5090 output_die (output_inlined_enumeration_type_die, type);
5094 output_die (output_inlined_structure_type_die, type);
5098 case QUAL_UNION_TYPE:
5099 output_die (output_inlined_union_type_die, type);
5103 abort (); /* Should never happen. */
5107 /* Output a TAG_lexical_block DIE followed by DIEs to represent all of
5108 the things which are local to the given block. */
5111 output_block (stmt, depth)
5115 register int must_output_die = 0;
5116 register tree origin;
5117 register enum tree_code origin_code;
5119 /* Ignore blocks never really used to make RTL. */
5121 if (! stmt || ! TREE_USED (stmt)
5122 || (!TREE_ASM_WRITTEN (stmt) && !BLOCK_ABSTRACT (stmt)))
5125 /* Determine the "ultimate origin" of this block. This block may be an
5126 inlined instance of an inlined instance of inline function, so we
5127 have to trace all of the way back through the origin chain to find
5128 out what sort of node actually served as the original seed for the
5129 creation of the current block. */
5131 origin = block_ultimate_origin (stmt);
5132 origin_code = (origin != NULL) ? TREE_CODE (origin) : ERROR_MARK;
5134 /* Determine if we need to output any Dwarf DIEs at all to represent this
5137 if (origin_code == FUNCTION_DECL)
5138 /* The outer scopes for inlinings *must* always be represented. We
5139 generate TAG_inlined_subroutine DIEs for them. (See below.) */
5140 must_output_die = 1;
5143 /* In the case where the current block represents an inlining of the
5144 "body block" of an inline function, we must *NOT* output any DIE
5145 for this block because we have already output a DIE to represent
5146 the whole inlined function scope and the "body block" of any
5147 function doesn't really represent a different scope according to
5148 ANSI C rules. So we check here to make sure that this block does
5149 not represent a "body block inlining" before trying to set the
5150 `must_output_die' flag. */
5152 if (! is_body_block (origin ? origin : stmt))
5154 /* Determine if this block directly contains any "significant"
5155 local declarations which we will need to output DIEs for. */
5157 if (debug_info_level > DINFO_LEVEL_TERSE)
5158 /* We are not in terse mode so *any* local declaration counts
5159 as being a "significant" one. */
5160 must_output_die = (BLOCK_VARS (stmt) != NULL);
5165 /* We are in terse mode, so only local (nested) function
5166 definitions count as "significant" local declarations. */
5168 for (decl = BLOCK_VARS (stmt); decl; decl = TREE_CHAIN (decl))
5169 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl))
5171 must_output_die = 1;
5178 /* It would be a waste of space to generate a Dwarf TAG_lexical_block
5179 DIE for any block which contains no significant local declarations
5180 at all. Rather, in such cases we just call `output_decls_for_scope'
5181 so that any needed Dwarf info for any sub-blocks will get properly
5182 generated. Note that in terse mode, our definition of what constitutes
5183 a "significant" local declaration gets restricted to include only
5184 inlined function instances and local (nested) function definitions. */
5186 if (origin_code == FUNCTION_DECL && BLOCK_ABSTRACT (stmt))
5187 /* We don't care about an abstract inlined subroutine. */;
5188 else if (must_output_die)
5190 output_die ((origin_code == FUNCTION_DECL)
5191 ? output_inlined_subroutine_die
5192 : output_lexical_block_die,
5194 output_decls_for_scope (stmt, depth);
5195 end_sibling_chain ();
5198 output_decls_for_scope (stmt, depth);
5201 /* Output all of the decls declared within a given scope (also called
5202 a `binding contour') and (recursively) all of it's sub-blocks. */
5205 output_decls_for_scope (stmt, depth)
5209 /* Ignore blocks never really used to make RTL. */
5211 if (! stmt || ! TREE_USED (stmt))
5214 /* Output the DIEs to represent all of the data objects, functions,
5215 typedefs, and tagged types declared directly within this block
5216 but not within any nested sub-blocks. */
5221 for (decl = BLOCK_VARS (stmt); decl; decl = TREE_CHAIN (decl))
5222 output_decl (decl, stmt);
5225 output_pending_types_for_scope (stmt);
5227 /* Output the DIEs to represent all sub-blocks (and the items declared
5228 therein) of this block. */
5231 register tree subblocks;
5233 for (subblocks = BLOCK_SUBBLOCKS (stmt);
5235 subblocks = BLOCK_CHAIN (subblocks))
5236 output_block (subblocks, depth + 1);
5240 /* Is this a typedef we can avoid emitting? */
5243 is_redundant_typedef (decl)
5246 if (TYPE_DECL_IS_STUB (decl))
5248 if (DECL_ARTIFICIAL (decl)
5249 && DECL_CONTEXT (decl)
5250 && is_tagged_type (DECL_CONTEXT (decl))
5251 && TREE_CODE (TYPE_NAME (DECL_CONTEXT (decl))) == TYPE_DECL
5252 && DECL_NAME (decl) == DECL_NAME (TYPE_NAME (DECL_CONTEXT (decl))))
5253 /* Also ignore the artificial member typedef for the class name. */
5258 /* Output Dwarf .debug information for a decl described by DECL. */
5261 output_decl (decl, containing_scope)
5263 register tree containing_scope;
5265 /* Make a note of the decl node we are going to be working on. We may
5266 need to give the user the source coordinates of where it appeared in
5267 case we notice (later on) that something about it looks screwy. */
5269 dwarf_last_decl = decl;
5271 if (TREE_CODE (decl) == ERROR_MARK)
5274 /* If a structure is declared within an initialization, e.g. as the
5275 operand of a sizeof, then it will not have a name. We don't want
5276 to output a DIE for it, as the tree nodes are in the temporary obstack */
5278 if ((TREE_CODE (TREE_TYPE (decl)) == RECORD_TYPE
5279 || TREE_CODE (TREE_TYPE (decl)) == UNION_TYPE)
5280 && ((DECL_NAME (decl) == 0 && TYPE_NAME (TREE_TYPE (decl)) == 0)
5281 || (TYPE_FIELDS (TREE_TYPE (decl))
5282 && (TREE_CODE (TYPE_FIELDS (TREE_TYPE (decl))) == ERROR_MARK))))
5285 /* If this ..._DECL node is marked to be ignored, then ignore it. */
5287 if (DECL_IGNORED_P (decl))
5290 switch (TREE_CODE (decl))
5293 /* The individual enumerators of an enum type get output when we
5294 output the Dwarf representation of the relevant enum type itself. */
5298 /* If we are in terse mode, don't output any DIEs to represent
5299 mere function declarations. Also, if we are conforming
5300 to the DWARF version 1 specification, don't output DIEs for
5301 mere function declarations. */
5303 if (DECL_INITIAL (decl) == NULL_TREE)
5304 #if (DWARF_VERSION > 1)
5305 if (debug_info_level <= DINFO_LEVEL_TERSE)
5309 /* Before we describe the FUNCTION_DECL itself, make sure that we
5310 have described its return type. */
5312 output_type (TREE_TYPE (TREE_TYPE (decl)), containing_scope);
5315 /* And its containing type. */
5316 register tree origin = decl_class_context (decl);
5318 output_type (origin, containing_scope);
5321 /* If we're emitting an out-of-line copy of an inline function,
5322 set up to refer to the abstract instance emitted from
5323 note_deferral_of_defined_inline_function. */
5324 if (DECL_INLINE (decl) && ! DECL_ABSTRACT (decl)
5325 && ! (containing_scope && TYPE_P (containing_scope)))
5326 set_decl_origin_self (decl);
5328 /* If the following DIE will represent a function definition for a
5329 function with "extern" linkage, output a special "pubnames" DIE
5330 label just ahead of the actual DIE. A reference to this label
5331 was already generated in the .debug_pubnames section sub-entry
5332 for this function definition. */
5334 if (TREE_PUBLIC (decl))
5336 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5338 sprintf (label, PUB_DIE_LABEL_FMT, next_pubname_number++);
5339 ASM_OUTPUT_LABEL (asm_out_file, label);
5342 /* Now output a DIE to represent the function itself. */
5344 output_die (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl)
5345 ? output_global_subroutine_die
5346 : output_local_subroutine_die,
5349 /* Now output descriptions of the arguments for this function.
5350 This gets (unnecessarily?) complex because of the fact that
5351 the DECL_ARGUMENT list for a FUNCTION_DECL doesn't indicate
5352 cases where there was a trailing `...' at the end of the formal
5353 parameter list. In order to find out if there was a trailing
5354 ellipsis or not, we must instead look at the type associated
5355 with the FUNCTION_DECL. This will be a node of type FUNCTION_TYPE.
5356 If the chain of type nodes hanging off of this FUNCTION_TYPE node
5357 ends with a void_type_node then there should *not* be an ellipsis
5360 /* In the case where we are describing a mere function declaration, all
5361 we need to do here (and all we *can* do here) is to describe
5362 the *types* of its formal parameters. */
5364 if (decl != current_function_decl || in_class)
5365 output_formal_types (TREE_TYPE (decl));
5368 /* Generate DIEs to represent all known formal parameters */
5370 register tree arg_decls = DECL_ARGUMENTS (decl);
5373 /* WARNING! Kludge zone ahead! Here we have a special
5374 hack for svr4 SDB compatibility. Instead of passing the
5375 current FUNCTION_DECL node as the second parameter (i.e.
5376 the `containing_scope' parameter) to `output_decl' (as
5377 we ought to) we instead pass a pointer to our own private
5378 fake_containing_scope node. That node is a RECORD_TYPE
5379 node which NO OTHER TYPE may ever actually be a member of.
5381 This pointer will ultimately get passed into `output_type'
5382 as its `containing_scope' parameter. `Output_type' will
5383 then perform its part in the hack... i.e. it will pend
5384 the type of the formal parameter onto the pending_types
5385 list. Later on, when we are done generating the whole
5386 sequence of formal parameter DIEs for this function
5387 definition, we will un-pend all previously pended types
5388 of formal parameters for this function definition.
5390 This whole kludge prevents any type DIEs from being
5391 mixed in with the formal parameter DIEs. That's good
5392 because svr4 SDB believes that the list of formal
5393 parameter DIEs for a function ends wherever the first
5394 non-formal-parameter DIE appears. Thus, we have to
5395 keep the formal parameter DIEs segregated. They must
5396 all appear (consecutively) at the start of the list of
5397 children for the DIE representing the function definition.
5398 Then (and only then) may we output any additional DIEs
5399 needed to represent the types of these formal parameters.
5403 When generating DIEs, generate the unspecified_parameters
5404 DIE instead if we come across the arg "__builtin_va_alist"
5407 for (parm = arg_decls; parm; parm = TREE_CHAIN (parm))
5408 if (TREE_CODE (parm) == PARM_DECL)
5410 if (DECL_NAME(parm) &&
5411 !strcmp(IDENTIFIER_POINTER(DECL_NAME(parm)),
5412 "__builtin_va_alist") )
5413 output_die (output_unspecified_parameters_die, decl);
5415 output_decl (parm, fake_containing_scope);
5419 Now that we have finished generating all of the DIEs to
5420 represent the formal parameters themselves, force out
5421 any DIEs needed to represent their types. We do this
5422 simply by un-pending all previously pended types which
5423 can legitimately go into the chain of children DIEs for
5424 the current FUNCTION_DECL.
5427 output_pending_types_for_scope (decl);
5430 Decide whether we need a unspecified_parameters DIE at the end.
5431 There are 2 more cases to do this for:
5432 1) the ansi ... declaration - this is detectable when the end
5433 of the arg list is not a void_type_node
5434 2) an unprototyped function declaration (not a definition). This
5435 just means that we have no info about the parameters at all.
5439 register tree fn_arg_types = TYPE_ARG_TYPES (TREE_TYPE (decl));
5443 /* this is the prototyped case, check for ... */
5444 if (TREE_VALUE (tree_last (fn_arg_types)) != void_type_node)
5445 output_die (output_unspecified_parameters_die, decl);
5449 /* this is unprototyped, check for undefined (just declaration) */
5450 if (!DECL_INITIAL (decl))
5451 output_die (output_unspecified_parameters_die, decl);
5455 /* Output Dwarf info for all of the stuff within the body of the
5456 function (if it has one - it may be just a declaration). */
5459 register tree outer_scope = DECL_INITIAL (decl);
5461 if (outer_scope && TREE_CODE (outer_scope) != ERROR_MARK)
5463 /* Note that here, `outer_scope' is a pointer to the outermost
5464 BLOCK node created to represent a function.
5465 This outermost BLOCK actually represents the outermost
5466 binding contour for the function, i.e. the contour in which
5467 the function's formal parameters and labels get declared.
5469 Curiously, it appears that the front end doesn't actually
5470 put the PARM_DECL nodes for the current function onto the
5471 BLOCK_VARS list for this outer scope. (They are strung
5472 off of the DECL_ARGUMENTS list for the function instead.)
5473 The BLOCK_VARS list for the `outer_scope' does provide us
5474 with a list of the LABEL_DECL nodes for the function however,
5475 and we output DWARF info for those here.
5477 Just within the `outer_scope' there will be a BLOCK node
5478 representing the function's outermost pair of curly braces,
5479 and any blocks used for the base and member initializers of
5480 a C++ constructor function. */
5482 output_decls_for_scope (outer_scope, 0);
5484 /* Finally, force out any pending types which are local to the
5485 outermost block of this function definition. These will
5486 all have a TYPE_CONTEXT which points to the FUNCTION_DECL
5489 output_pending_types_for_scope (decl);
5494 /* Generate a terminator for the list of stuff `owned' by this
5497 end_sibling_chain ();
5502 /* If we are in terse mode, don't generate any DIEs to represent
5503 any actual typedefs. Note that even when we are in terse mode,
5504 we must still output DIEs to represent those tagged types which
5505 are used (directly or indirectly) in the specification of either
5506 a return type or a formal parameter type of some function. */
5508 if (debug_info_level <= DINFO_LEVEL_TERSE)
5509 if (! TYPE_DECL_IS_STUB (decl)
5510 || (! TYPE_USED_FOR_FUNCTION (TREE_TYPE (decl)) && ! in_class))
5513 /* In the special case of a TYPE_DECL node representing
5514 the declaration of some type tag, if the given TYPE_DECL is
5515 marked as having been instantiated from some other (original)
5516 TYPE_DECL node (e.g. one which was generated within the original
5517 definition of an inline function) we have to generate a special
5518 (abbreviated) TAG_structure_type, TAG_union_type, or
5519 TAG_enumeration-type DIE here. */
5521 if (TYPE_DECL_IS_STUB (decl) && DECL_ABSTRACT_ORIGIN (decl))
5523 output_tagged_type_instantiation (TREE_TYPE (decl));
5527 output_type (TREE_TYPE (decl), containing_scope);
5529 if (! is_redundant_typedef (decl))
5530 /* Output a DIE to represent the typedef itself. */
5531 output_die (output_typedef_die, decl);
5535 if (debug_info_level >= DINFO_LEVEL_NORMAL)
5536 output_die (output_label_die, decl);
5540 /* If we are conforming to the DWARF version 1 specification, don't
5541 generated any DIEs to represent mere external object declarations. */
5543 #if (DWARF_VERSION <= 1)
5544 if (DECL_EXTERNAL (decl) && ! TREE_PUBLIC (decl))
5548 /* If we are in terse mode, don't generate any DIEs to represent
5549 any variable declarations or definitions. */
5551 if (debug_info_level <= DINFO_LEVEL_TERSE)
5554 /* Output any DIEs that are needed to specify the type of this data
5557 output_type (TREE_TYPE (decl), containing_scope);
5560 /* And its containing type. */
5561 register tree origin = decl_class_context (decl);
5563 output_type (origin, containing_scope);
5566 /* If the following DIE will represent a data object definition for a
5567 data object with "extern" linkage, output a special "pubnames" DIE
5568 label just ahead of the actual DIE. A reference to this label
5569 was already generated in the .debug_pubnames section sub-entry
5570 for this data object definition. */
5572 if (TREE_PUBLIC (decl) && ! DECL_ABSTRACT (decl))
5574 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5576 sprintf (label, PUB_DIE_LABEL_FMT, next_pubname_number++);
5577 ASM_OUTPUT_LABEL (asm_out_file, label);
5580 /* Now output the DIE to represent the data object itself. This gets
5581 complicated because of the possibility that the VAR_DECL really
5582 represents an inlined instance of a formal parameter for an inline
5586 register void (*func) PARAMS ((void *));
5587 register tree origin = decl_ultimate_origin (decl);
5589 if (origin != NULL && TREE_CODE (origin) == PARM_DECL)
5590 func = output_formal_parameter_die;
5593 if (TREE_PUBLIC (decl) || DECL_EXTERNAL (decl))
5594 func = output_global_variable_die;
5596 func = output_local_variable_die;
5598 output_die (func, decl);
5603 /* Ignore the nameless fields that are used to skip bits. */
5604 if (DECL_NAME (decl) != 0)
5606 output_type (member_declared_type (decl), containing_scope);
5607 output_die (output_member_die, decl);
5612 /* Force out the type of this formal, if it was not forced out yet.
5613 Note that here we can run afowl of a bug in "classic" svr4 SDB.
5614 It should be able to grok the presence of type DIEs within a list
5615 of TAG_formal_parameter DIEs, but it doesn't. */
5617 output_type (TREE_TYPE (decl), containing_scope);
5618 output_die (output_formal_parameter_die, decl);
5621 case NAMESPACE_DECL:
5622 /* Ignore for now. */
5631 dwarfout_file_scope_decl (decl, set_finalizing)
5633 register int set_finalizing;
5635 if (TREE_CODE (decl) == ERROR_MARK)
5638 /* If this ..._DECL node is marked to be ignored, then ignore it. */
5640 if (DECL_IGNORED_P (decl))
5643 switch (TREE_CODE (decl))
5647 /* Ignore this FUNCTION_DECL if it refers to a builtin declaration of
5648 a builtin function. Explicit programmer-supplied declarations of
5649 these same functions should NOT be ignored however. */
5651 if (DECL_EXTERNAL (decl) && DECL_FUNCTION_CODE (decl))
5654 /* What we would really like to do here is to filter out all mere
5655 file-scope declarations of file-scope functions which are never
5656 referenced later within this translation unit (and keep all of
5657 ones that *are* referenced later on) but we aren't clairvoyant,
5658 so we have no idea which functions will be referenced in the
5659 future (i.e. later on within the current translation unit).
5660 So here we just ignore all file-scope function declarations
5661 which are not also definitions. If and when the debugger needs
5662 to know something about these functions, it wil have to hunt
5663 around and find the DWARF information associated with the
5664 *definition* of the function.
5666 Note that we can't just check `DECL_EXTERNAL' to find out which
5667 FUNCTION_DECL nodes represent definitions and which ones represent
5668 mere declarations. We have to check `DECL_INITIAL' instead. That's
5669 because the C front-end supports some weird semantics for "extern
5670 inline" function definitions. These can get inlined within the
5671 current translation unit (an thus, we need to generate DWARF info
5672 for their abstract instances so that the DWARF info for the
5673 concrete inlined instances can have something to refer to) but
5674 the compiler never generates any out-of-lines instances of such
5675 things (despite the fact that they *are* definitions). The
5676 important point is that the C front-end marks these "extern inline"
5677 functions as DECL_EXTERNAL, but we need to generate DWARF for them
5680 Note that the C++ front-end also plays some similar games for inline
5681 function definitions appearing within include files which also
5682 contain `#pragma interface' pragmas. */
5684 if (DECL_INITIAL (decl) == NULL_TREE)
5687 if (TREE_PUBLIC (decl)
5688 && ! DECL_EXTERNAL (decl)
5689 && ! DECL_ABSTRACT (decl))
5691 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5693 /* Output a .debug_pubnames entry for a public function
5694 defined in this compilation unit. */
5696 fputc ('\n', asm_out_file);
5697 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_PUBNAMES_SECTION);
5698 sprintf (label, PUB_DIE_LABEL_FMT, next_pubname_number);
5699 ASM_OUTPUT_DWARF_ADDR (asm_out_file, label);
5700 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file,
5701 IDENTIFIER_POINTER (DECL_NAME (decl)));
5702 ASM_OUTPUT_POP_SECTION (asm_out_file);
5709 /* Ignore this VAR_DECL if it refers to a file-scope extern data
5710 object declaration and if the declaration was never even
5711 referenced from within this entire compilation unit. We
5712 suppress these DIEs in order to save space in the .debug section
5713 (by eliminating entries which are probably useless). Note that
5714 we must not suppress block-local extern declarations (whether
5715 used or not) because that would screw-up the debugger's name
5716 lookup mechanism and cause it to miss things which really ought
5717 to be in scope at a given point. */
5719 if (DECL_EXTERNAL (decl) && !TREE_USED (decl))
5722 if (TREE_PUBLIC (decl)
5723 && ! DECL_EXTERNAL (decl)
5724 && GET_CODE (DECL_RTL (decl)) == MEM
5725 && ! DECL_ABSTRACT (decl))
5727 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5729 if (debug_info_level >= DINFO_LEVEL_NORMAL)
5731 /* Output a .debug_pubnames entry for a public variable
5732 defined in this compilation unit. */
5734 fputc ('\n', asm_out_file);
5735 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_PUBNAMES_SECTION);
5736 sprintf (label, PUB_DIE_LABEL_FMT, next_pubname_number);
5737 ASM_OUTPUT_DWARF_ADDR (asm_out_file, label);
5738 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file,
5739 IDENTIFIER_POINTER (DECL_NAME (decl)));
5740 ASM_OUTPUT_POP_SECTION (asm_out_file);
5743 if (DECL_INITIAL (decl) == NULL)
5745 /* Output a .debug_aranges entry for a public variable
5746 which is tentatively defined in this compilation unit. */
5748 fputc ('\n', asm_out_file);
5749 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_ARANGES_SECTION);
5750 ASM_OUTPUT_DWARF_ADDR (asm_out_file,
5751 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)));
5752 ASM_OUTPUT_DWARF_DATA4 (asm_out_file,
5753 (unsigned) int_size_in_bytes (TREE_TYPE (decl)));
5754 ASM_OUTPUT_POP_SECTION (asm_out_file);
5758 /* If we are in terse mode, don't generate any DIEs to represent
5759 any variable declarations or definitions. */
5761 if (debug_info_level <= DINFO_LEVEL_TERSE)
5767 /* Don't bother trying to generate any DIEs to represent any of the
5768 normal built-in types for the language we are compiling, except
5769 in cases where the types in question are *not* DWARF fundamental
5770 types. We make an exception in the case of non-fundamental types
5771 for the sake of objective C (and perhaps C++) because the GNU
5772 front-ends for these languages may in fact create certain "built-in"
5773 types which are (for example) RECORD_TYPEs. In such cases, we
5774 really need to output these (non-fundamental) types because other
5775 DIEs may contain references to them. */
5777 /* Also ignore language dependent types here, because they are probably
5778 also built-in types. If we didn't ignore them, then we would get
5779 references to undefined labels because output_type doesn't support
5780 them. So, for now, we need to ignore them to avoid assembler
5783 /* ??? This code is different than the equivalent code in dwarf2out.c.
5784 The dwarf2out.c code is probably more correct. */
5786 if (DECL_SOURCE_LINE (decl) == 0
5787 && (type_is_fundamental (TREE_TYPE (decl))
5788 || TREE_CODE (TREE_TYPE (decl)) == LANG_TYPE))
5791 /* If we are in terse mode, don't generate any DIEs to represent
5792 any actual typedefs. Note that even when we are in terse mode,
5793 we must still output DIEs to represent those tagged types which
5794 are used (directly or indirectly) in the specification of either
5795 a return type or a formal parameter type of some function. */
5797 if (debug_info_level <= DINFO_LEVEL_TERSE)
5798 if (! TYPE_DECL_IS_STUB (decl)
5799 || ! TYPE_USED_FOR_FUNCTION (TREE_TYPE (decl)))
5808 fputc ('\n', asm_out_file);
5809 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SECTION);
5810 finalizing = set_finalizing;
5811 output_decl (decl, NULL_TREE);
5813 /* NOTE: The call above to `output_decl' may have caused one or more
5814 file-scope named types (i.e. tagged types) to be placed onto the
5815 pending_types_list. We have to get those types off of that list
5816 at some point, and this is the perfect time to do it. If we didn't
5817 take them off now, they might still be on the list when cc1 finally
5818 exits. That might be OK if it weren't for the fact that when we put
5819 types onto the pending_types_list, we set the TREE_ASM_WRITTEN flag
5820 for these types, and that causes them never to be output unless
5821 `output_pending_types_for_scope' takes them off of the list and un-sets
5822 their TREE_ASM_WRITTEN flags. */
5824 output_pending_types_for_scope (NULL_TREE);
5826 /* The above call should have totally emptied the pending_types_list
5827 if this is not a nested function or class. If this is a nested type,
5828 then the remaining pending_types will be emitted when the containing type
5831 if (! DECL_CONTEXT (decl))
5833 if (pending_types != 0)
5837 ASM_OUTPUT_POP_SECTION (asm_out_file);
5839 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl) != NULL)
5840 current_funcdef_number++;
5843 /* Output a marker (i.e. a label) for the beginning of the generated code
5844 for a lexical block. */
5847 dwarfout_begin_block (line, blocknum)
5848 unsigned int line ATTRIBUTE_UNUSED;
5849 unsigned int blocknum;
5851 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5853 function_section (current_function_decl);
5854 sprintf (label, BLOCK_BEGIN_LABEL_FMT, blocknum);
5855 ASM_OUTPUT_LABEL (asm_out_file, label);
5858 /* Output a marker (i.e. a label) for the end of the generated code
5859 for a lexical block. */
5862 dwarfout_end_block (line, blocknum)
5863 unsigned int line ATTRIBUTE_UNUSED;
5864 unsigned int blocknum;
5866 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5868 function_section (current_function_decl);
5869 sprintf (label, BLOCK_END_LABEL_FMT, blocknum);
5870 ASM_OUTPUT_LABEL (asm_out_file, label);
5873 /* Output a marker (i.e. a label) for the point in the generated code where
5874 the real body of the function begins (after parameters have been moved
5875 to their home locations). */
5878 dwarfout_begin_function ()
5880 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5882 if (! use_gnu_debug_info_extensions)
5884 function_section (current_function_decl);
5885 sprintf (label, BODY_BEGIN_LABEL_FMT, current_funcdef_number);
5886 ASM_OUTPUT_LABEL (asm_out_file, label);
5889 /* Output a marker (i.e. a label) for the point in the generated code where
5890 the real body of the function ends (just before the epilogue code). */
5893 dwarfout_end_function (line)
5894 unsigned int line ATTRIBUTE_UNUSED;
5896 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5898 if (! use_gnu_debug_info_extensions)
5900 function_section (current_function_decl);
5901 sprintf (label, BODY_END_LABEL_FMT, current_funcdef_number);
5902 ASM_OUTPUT_LABEL (asm_out_file, label);
5905 /* Output a marker (i.e. a label) for the absolute end of the generated code
5906 for a function definition. This gets called *after* the epilogue code
5907 has been generated. */
5910 dwarfout_end_epilogue ()
5912 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5914 /* Output a label to mark the endpoint of the code generated for this
5917 sprintf (label, FUNC_END_LABEL_FMT, current_funcdef_number);
5918 ASM_OUTPUT_LABEL (asm_out_file, label);
5922 shuffle_filename_entry (new_zeroth)
5923 register filename_entry *new_zeroth;
5925 filename_entry temp_entry;
5926 register filename_entry *limit_p;
5927 register filename_entry *move_p;
5929 if (new_zeroth == &filename_table[0])
5932 temp_entry = *new_zeroth;
5934 /* Shift entries up in the table to make room at [0]. */
5936 limit_p = &filename_table[0];
5937 for (move_p = new_zeroth; move_p > limit_p; move_p--)
5938 *move_p = *(move_p-1);
5940 /* Install the found entry at [0]. */
5942 filename_table[0] = temp_entry;
5945 /* Create a new (string) entry for the .debug_sfnames section. */
5948 generate_new_sfname_entry ()
5950 char label[MAX_ARTIFICIAL_LABEL_BYTES];
5952 fputc ('\n', asm_out_file);
5953 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SFNAMES_SECTION);
5954 sprintf (label, SFNAMES_ENTRY_LABEL_FMT, filename_table[0].number);
5955 ASM_OUTPUT_LABEL (asm_out_file, label);
5956 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file,
5957 filename_table[0].name
5958 ? filename_table[0].name
5960 ASM_OUTPUT_POP_SECTION (asm_out_file);
5963 /* Lookup a filename (in the list of filenames that we know about here in
5964 dwarfout.c) and return its "index". The index of each (known) filename
5965 is just a unique number which is associated with only that one filename.
5966 We need such numbers for the sake of generating labels (in the
5967 .debug_sfnames section) and references to those unique labels (in the
5968 .debug_srcinfo and .debug_macinfo sections).
5970 If the filename given as an argument is not found in our current list,
5971 add it to the list and assign it the next available unique index number.
5973 Whatever we do (i.e. whether we find a pre-existing filename or add a new
5974 one), we shuffle the filename found (or added) up to the zeroth entry of
5975 our list of filenames (which is always searched linearly). We do this so
5976 as to optimize the most common case for these filename lookups within
5977 dwarfout.c. The most common case by far is the case where we call
5978 lookup_filename to lookup the very same filename that we did a lookup
5979 on the last time we called lookup_filename. We make sure that this
5980 common case is fast because such cases will constitute 99.9% of the
5981 lookups we ever do (in practice).
5983 If we add a new filename entry to our table, we go ahead and generate
5984 the corresponding entry in the .debug_sfnames section right away.
5985 Doing so allows us to avoid tickling an assembler bug (present in some
5986 m68k assemblers) which yields assembly-time errors in cases where the
5987 difference of two label addresses is taken and where the two labels
5988 are in a section *other* than the one where the difference is being
5989 calculated, and where at least one of the two symbol references is a
5990 forward reference. (This bug could be tickled by our .debug_srcinfo
5991 entries if we don't output their corresponding .debug_sfnames entries
5995 lookup_filename (file_name)
5996 const char *file_name;
5998 register filename_entry *search_p;
5999 register filename_entry *limit_p = &filename_table[ft_entries];
6001 for (search_p = filename_table; search_p < limit_p; search_p++)
6002 if (!strcmp (file_name, search_p->name))
6004 /* When we get here, we have found the filename that we were
6005 looking for in the filename_table. Now we want to make sure
6006 that it gets moved to the zero'th entry in the table (if it
6007 is not already there) so that subsequent attempts to find the
6008 same filename will find it as quickly as possible. */
6010 shuffle_filename_entry (search_p);
6011 return filename_table[0].number;
6014 /* We come here whenever we have a new filename which is not registered
6015 in the current table. Here we add it to the table. */
6017 /* Prepare to add a new table entry by making sure there is enough space
6018 in the table to do so. If not, expand the current table. */
6020 if (ft_entries == ft_entries_allocated)
6022 ft_entries_allocated += FT_ENTRIES_INCREMENT;
6024 = (filename_entry *)
6025 xrealloc (filename_table,
6026 ft_entries_allocated * sizeof (filename_entry));
6029 /* Initially, add the new entry at the end of the filename table. */
6031 filename_table[ft_entries].number = ft_entries;
6032 filename_table[ft_entries].name = xstrdup (file_name);
6034 /* Shuffle the new entry into filename_table[0]. */
6036 shuffle_filename_entry (&filename_table[ft_entries]);
6038 if (debug_info_level >= DINFO_LEVEL_NORMAL)
6039 generate_new_sfname_entry ();
6042 return filename_table[0].number;
6046 generate_srcinfo_entry (line_entry_num, files_entry_num)
6047 unsigned line_entry_num;
6048 unsigned files_entry_num;
6050 char label[MAX_ARTIFICIAL_LABEL_BYTES];
6052 fputc ('\n', asm_out_file);
6053 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SRCINFO_SECTION);
6054 sprintf (label, LINE_ENTRY_LABEL_FMT, line_entry_num);
6055 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, label, LINE_BEGIN_LABEL);
6056 sprintf (label, SFNAMES_ENTRY_LABEL_FMT, files_entry_num);
6057 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, label, SFNAMES_BEGIN_LABEL);
6058 ASM_OUTPUT_POP_SECTION (asm_out_file);
6062 dwarfout_source_line (filename, note)
6063 const char *filename;
6066 unsigned int line = NOTE_LINE_NUMBER (note);
6068 if (debug_info_level >= DINFO_LEVEL_NORMAL
6069 /* We can't emit line number info for functions in separate sections,
6070 because the assembler can't subtract labels in different sections. */
6071 && DECL_SECTION_NAME (current_function_decl) == NULL_TREE)
6073 char label[MAX_ARTIFICIAL_LABEL_BYTES];
6074 static unsigned last_line_entry_num = 0;
6075 static unsigned prev_file_entry_num = (unsigned) -1;
6076 register unsigned this_file_entry_num;
6078 function_section (current_function_decl);
6079 sprintf (label, LINE_CODE_LABEL_FMT, ++last_line_entry_num);
6080 ASM_OUTPUT_LABEL (asm_out_file, label);
6082 fputc ('\n', asm_out_file);
6084 if (use_gnu_debug_info_extensions)
6085 this_file_entry_num = lookup_filename (filename);
6087 this_file_entry_num = (unsigned) -1;
6089 ASM_OUTPUT_PUSH_SECTION (asm_out_file, LINE_SECTION);
6090 if (this_file_entry_num != prev_file_entry_num)
6092 char line_entry_label[MAX_ARTIFICIAL_LABEL_BYTES];
6094 sprintf (line_entry_label, LINE_ENTRY_LABEL_FMT, last_line_entry_num);
6095 ASM_OUTPUT_LABEL (asm_out_file, line_entry_label);
6099 register const char *tail = strrchr (filename, '/');
6105 fprintf (asm_out_file, "%s%u\t%s %s:%u\n",
6106 UNALIGNED_INT_ASM_OP, line, ASM_COMMENT_START,
6108 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, 0xffff);
6109 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, label, TEXT_BEGIN_LABEL);
6110 ASM_OUTPUT_POP_SECTION (asm_out_file);
6112 if (this_file_entry_num != prev_file_entry_num)
6113 generate_srcinfo_entry (last_line_entry_num, this_file_entry_num);
6114 prev_file_entry_num = this_file_entry_num;
6118 /* Generate an entry in the .debug_macinfo section. */
6121 generate_macinfo_entry (type_and_offset, string)
6122 register const char *type_and_offset;
6123 register const char *string;
6125 if (! use_gnu_debug_info_extensions)
6128 fputc ('\n', asm_out_file);
6129 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_MACINFO_SECTION);
6130 fprintf (asm_out_file, "%s%s\n", UNALIGNED_INT_ASM_OP, type_and_offset);
6131 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, string);
6132 ASM_OUTPUT_POP_SECTION (asm_out_file);
6135 /* Wrapper for toplev.c callback to check debug info level. */
6137 dwarfout_start_source_file_check (line, filename)
6139 register const char *filename;
6141 if (debug_info_level == DINFO_LEVEL_VERBOSE)
6142 dwarfout_start_source_file (line, filename);
6146 dwarfout_start_source_file (line, filename)
6147 unsigned int line ATTRIBUTE_UNUSED;
6148 register const char *filename;
6150 char label[MAX_ARTIFICIAL_LABEL_BYTES];
6151 char type_and_offset[MAX_ARTIFICIAL_LABEL_BYTES*3];
6153 sprintf (label, SFNAMES_ENTRY_LABEL_FMT, lookup_filename (filename));
6154 sprintf (type_and_offset, "0x%08x+%s-%s",
6155 ((unsigned) MACINFO_start << 24),
6156 /* Hack: skip leading '*' . */
6157 (*label == '*') + label,
6158 (*SFNAMES_BEGIN_LABEL == '*') + SFNAMES_BEGIN_LABEL);
6159 generate_macinfo_entry (type_and_offset, "");
6162 /* Wrapper for toplev.c callback to check debug info level. */
6164 dwarfout_end_source_file_check (lineno)
6165 register unsigned lineno;
6167 if (debug_info_level == DINFO_LEVEL_VERBOSE)
6168 dwarfout_end_source_file (lineno);
6172 dwarfout_end_source_file (lineno)
6173 register unsigned lineno;
6175 char type_and_offset[MAX_ARTIFICIAL_LABEL_BYTES*2];
6177 sprintf (type_and_offset, "0x%08x+%u",
6178 ((unsigned) MACINFO_resume << 24), lineno);
6179 generate_macinfo_entry (type_and_offset, "");
6182 /* Called from check_newline in c-parse.y. The `buffer' parameter
6183 contains the tail part of the directive line, i.e. the part which
6184 is past the initial whitespace, #, whitespace, directive-name,
6188 dwarfout_define (lineno, buffer)
6189 register unsigned lineno;
6190 register const char *buffer;
6192 static int initialized = 0;
6193 char type_and_offset[MAX_ARTIFICIAL_LABEL_BYTES*2];
6197 dwarfout_start_source_file (0, primary_filename);
6200 sprintf (type_and_offset, "0x%08x+%u",
6201 ((unsigned) MACINFO_define << 24), lineno);
6202 generate_macinfo_entry (type_and_offset, buffer);
6205 /* Called from check_newline in c-parse.y. The `buffer' parameter
6206 contains the tail part of the directive line, i.e. the part which
6207 is past the initial whitespace, #, whitespace, directive-name,
6211 dwarfout_undef (lineno, buffer)
6212 register unsigned lineno;
6213 register const char *buffer;
6215 char type_and_offset[MAX_ARTIFICIAL_LABEL_BYTES*2];
6217 sprintf (type_and_offset, "0x%08x+%u",
6218 ((unsigned) MACINFO_undef << 24), lineno);
6219 generate_macinfo_entry (type_and_offset, buffer);
6222 /* Set up for Dwarf output at the start of compilation. */
6225 dwarfout_init (main_input_filename)
6226 register const char *main_input_filename;
6228 /* Remember the name of the primary input file. */
6230 primary_filename = main_input_filename;
6232 /* Allocate the initial hunk of the pending_sibling_stack. */
6234 pending_sibling_stack
6236 xmalloc (PENDING_SIBLINGS_INCREMENT * sizeof (unsigned));
6237 pending_siblings_allocated = PENDING_SIBLINGS_INCREMENT;
6238 pending_siblings = 1;
6240 /* Allocate the initial hunk of the filename_table. */
6243 = (filename_entry *)
6244 xmalloc (FT_ENTRIES_INCREMENT * sizeof (filename_entry));
6245 ft_entries_allocated = FT_ENTRIES_INCREMENT;
6248 /* Allocate the initial hunk of the pending_types_list. */
6251 = (tree *) xmalloc (PENDING_TYPES_INCREMENT * sizeof (tree));
6252 pending_types_allocated = PENDING_TYPES_INCREMENT;
6255 /* Create an artificial RECORD_TYPE node which we can use in our hack
6256 to get the DIEs representing types of formal parameters to come out
6257 only *after* the DIEs for the formal parameters themselves. */
6259 fake_containing_scope = make_node (RECORD_TYPE);
6261 /* Output a starting label for the .text section. */
6263 fputc ('\n', asm_out_file);
6264 ASM_OUTPUT_PUSH_SECTION (asm_out_file, TEXT_SECTION);
6265 ASM_OUTPUT_LABEL (asm_out_file, TEXT_BEGIN_LABEL);
6266 ASM_OUTPUT_POP_SECTION (asm_out_file);
6268 /* Output a starting label for the .data section. */
6270 fputc ('\n', asm_out_file);
6271 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DATA_SECTION);
6272 ASM_OUTPUT_LABEL (asm_out_file, DATA_BEGIN_LABEL);
6273 ASM_OUTPUT_POP_SECTION (asm_out_file);
6275 #if 0 /* GNU C doesn't currently use .data1. */
6276 /* Output a starting label for the .data1 section. */
6278 fputc ('\n', asm_out_file);
6279 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DATA1_SECTION);
6280 ASM_OUTPUT_LABEL (asm_out_file, DATA1_BEGIN_LABEL);
6281 ASM_OUTPUT_POP_SECTION (asm_out_file);
6284 /* Output a starting label for the .rodata section. */
6286 fputc ('\n', asm_out_file);
6287 ASM_OUTPUT_PUSH_SECTION (asm_out_file, RODATA_SECTION);
6288 ASM_OUTPUT_LABEL (asm_out_file, RODATA_BEGIN_LABEL);
6289 ASM_OUTPUT_POP_SECTION (asm_out_file);
6291 #if 0 /* GNU C doesn't currently use .rodata1. */
6292 /* Output a starting label for the .rodata1 section. */
6294 fputc ('\n', asm_out_file);
6295 ASM_OUTPUT_PUSH_SECTION (asm_out_file, RODATA1_SECTION);
6296 ASM_OUTPUT_LABEL (asm_out_file, RODATA1_BEGIN_LABEL);
6297 ASM_OUTPUT_POP_SECTION (asm_out_file);
6300 /* Output a starting label for the .bss section. */
6302 fputc ('\n', asm_out_file);
6303 ASM_OUTPUT_PUSH_SECTION (asm_out_file, BSS_SECTION);
6304 ASM_OUTPUT_LABEL (asm_out_file, BSS_BEGIN_LABEL);
6305 ASM_OUTPUT_POP_SECTION (asm_out_file);
6307 if (debug_info_level >= DINFO_LEVEL_NORMAL)
6309 if (use_gnu_debug_info_extensions)
6311 /* Output a starting label and an initial (compilation directory)
6312 entry for the .debug_sfnames section. The starting label will be
6313 referenced by the initial entry in the .debug_srcinfo section. */
6315 fputc ('\n', asm_out_file);
6316 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SFNAMES_SECTION);
6317 ASM_OUTPUT_LABEL (asm_out_file, SFNAMES_BEGIN_LABEL);
6319 register const char *pwd = getpwd ();
6320 register char *dirname;
6323 fatal_io_error ("can't get current directory");
6325 dirname = concat (pwd, "/", NULL);
6326 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, dirname);
6329 ASM_OUTPUT_POP_SECTION (asm_out_file);
6332 if (debug_info_level >= DINFO_LEVEL_VERBOSE
6333 && use_gnu_debug_info_extensions)
6335 /* Output a starting label for the .debug_macinfo section. This
6336 label will be referenced by the AT_mac_info attribute in the
6337 TAG_compile_unit DIE. */
6339 fputc ('\n', asm_out_file);
6340 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_MACINFO_SECTION);
6341 ASM_OUTPUT_LABEL (asm_out_file, MACINFO_BEGIN_LABEL);
6342 ASM_OUTPUT_POP_SECTION (asm_out_file);
6345 /* Generate the initial entry for the .line section. */
6347 fputc ('\n', asm_out_file);
6348 ASM_OUTPUT_PUSH_SECTION (asm_out_file, LINE_SECTION);
6349 ASM_OUTPUT_LABEL (asm_out_file, LINE_BEGIN_LABEL);
6350 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, LINE_END_LABEL, LINE_BEGIN_LABEL);
6351 ASM_OUTPUT_DWARF_ADDR (asm_out_file, TEXT_BEGIN_LABEL);
6352 ASM_OUTPUT_POP_SECTION (asm_out_file);
6354 if (use_gnu_debug_info_extensions)
6356 /* Generate the initial entry for the .debug_srcinfo section. */
6358 fputc ('\n', asm_out_file);
6359 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SRCINFO_SECTION);
6360 ASM_OUTPUT_LABEL (asm_out_file, SRCINFO_BEGIN_LABEL);
6361 ASM_OUTPUT_DWARF_ADDR (asm_out_file, LINE_BEGIN_LABEL);
6362 ASM_OUTPUT_DWARF_ADDR (asm_out_file, SFNAMES_BEGIN_LABEL);
6363 ASM_OUTPUT_DWARF_ADDR (asm_out_file, TEXT_BEGIN_LABEL);
6364 ASM_OUTPUT_DWARF_ADDR (asm_out_file, TEXT_END_LABEL);
6365 #ifdef DWARF_TIMESTAMPS
6366 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, time (NULL));
6368 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, -1);
6370 ASM_OUTPUT_POP_SECTION (asm_out_file);
6373 /* Generate the initial entry for the .debug_pubnames section. */
6375 fputc ('\n', asm_out_file);
6376 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_PUBNAMES_SECTION);
6377 ASM_OUTPUT_DWARF_ADDR (asm_out_file, DEBUG_BEGIN_LABEL);
6378 ASM_OUTPUT_POP_SECTION (asm_out_file);
6380 /* Generate the initial entry for the .debug_aranges section. */
6382 fputc ('\n', asm_out_file);
6383 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_ARANGES_SECTION);
6384 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file,
6385 DEBUG_ARANGES_END_LABEL,
6386 DEBUG_ARANGES_BEGIN_LABEL);
6387 ASM_OUTPUT_LABEL (asm_out_file, DEBUG_ARANGES_BEGIN_LABEL);
6388 ASM_OUTPUT_DWARF_DATA1 (asm_out_file, 1);
6389 ASM_OUTPUT_DWARF_ADDR (asm_out_file, DEBUG_BEGIN_LABEL);
6390 ASM_OUTPUT_POP_SECTION (asm_out_file);
6393 /* Setup first DIE number == 1. */
6394 NEXT_DIE_NUM = next_unused_dienum++;
6396 /* Generate the initial DIE for the .debug section. Note that the
6397 (string) value given in the AT_name attribute of the TAG_compile_unit
6398 DIE will (typically) be a relative pathname and that this pathname
6399 should be taken as being relative to the directory from which the
6400 compiler was invoked when the given (base) source file was compiled. */
6402 fputc ('\n', asm_out_file);
6403 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SECTION);
6404 ASM_OUTPUT_LABEL (asm_out_file, DEBUG_BEGIN_LABEL);
6405 output_die (output_compile_unit_die, (PTR) main_input_filename);
6406 ASM_OUTPUT_POP_SECTION (asm_out_file);
6408 fputc ('\n', asm_out_file);
6411 /* Output stuff that dwarf requires at the end of every file. */
6414 dwarfout_finish (main_input_filename)
6415 register const char *main_input_filename ATTRIBUTE_UNUSED;
6417 char label[MAX_ARTIFICIAL_LABEL_BYTES];
6419 fputc ('\n', asm_out_file);
6420 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SECTION);
6421 retry_incomplete_types ();
6422 fputc ('\n', asm_out_file);
6424 /* Mark the end of the chain of siblings which represent all file-scope
6425 declarations in this compilation unit. */
6427 /* The (null) DIE which represents the terminator for the (sibling linked)
6428 list of file-scope items is *special*. Normally, we would just call
6429 end_sibling_chain at this point in order to output a word with the
6430 value `4' and that word would act as the terminator for the list of
6431 DIEs describing file-scope items. Unfortunately, if we were to simply
6432 do that, the label that would follow this DIE in the .debug section
6433 (i.e. `..D2') would *not* be properly aligned (as it must be on some
6434 machines) to a 4 byte boundary.
6436 In order to force the label `..D2' to get aligned to a 4 byte boundary,
6437 the trick used is to insert extra (otherwise useless) padding bytes
6438 into the (null) DIE that we know must precede the ..D2 label in the
6439 .debug section. The amount of padding required can be anywhere between
6440 0 and 3 bytes. The length word at the start of this DIE (i.e. the one
6441 with the padding) would normally contain the value 4, but now it will
6442 also have to include the padding bytes, so it will instead have some
6443 value in the range 4..7.
6445 Fortunately, the rules of Dwarf say that any DIE whose length word
6446 contains *any* value less than 8 should be treated as a null DIE, so
6447 this trick works out nicely. Clever, eh? Don't give me any credit
6448 (or blame). I didn't think of this scheme. I just conformed to it.
6451 output_die (output_padded_null_die, (void *) 0);
6454 sprintf (label, DIE_BEGIN_LABEL_FMT, NEXT_DIE_NUM);
6455 ASM_OUTPUT_LABEL (asm_out_file, label); /* should be ..D2 */
6456 ASM_OUTPUT_POP_SECTION (asm_out_file);
6458 /* Output a terminator label for the .text section. */
6460 fputc ('\n', asm_out_file);
6461 ASM_OUTPUT_PUSH_SECTION (asm_out_file, TEXT_SECTION);
6462 ASM_OUTPUT_LABEL (asm_out_file, TEXT_END_LABEL);
6463 ASM_OUTPUT_POP_SECTION (asm_out_file);
6465 /* Output a terminator label for the .data section. */
6467 fputc ('\n', asm_out_file);
6468 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DATA_SECTION);
6469 ASM_OUTPUT_LABEL (asm_out_file, DATA_END_LABEL);
6470 ASM_OUTPUT_POP_SECTION (asm_out_file);
6472 #if 0 /* GNU C doesn't currently use .data1. */
6473 /* Output a terminator label for the .data1 section. */
6475 fputc ('\n', asm_out_file);
6476 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DATA1_SECTION);
6477 ASM_OUTPUT_LABEL (asm_out_file, DATA1_END_LABEL);
6478 ASM_OUTPUT_POP_SECTION (asm_out_file);
6481 /* Output a terminator label for the .rodata section. */
6483 fputc ('\n', asm_out_file);
6484 ASM_OUTPUT_PUSH_SECTION (asm_out_file, RODATA_SECTION);
6485 ASM_OUTPUT_LABEL (asm_out_file, RODATA_END_LABEL);
6486 ASM_OUTPUT_POP_SECTION (asm_out_file);
6488 #if 0 /* GNU C doesn't currently use .rodata1. */
6489 /* Output a terminator label for the .rodata1 section. */
6491 fputc ('\n', asm_out_file);
6492 ASM_OUTPUT_PUSH_SECTION (asm_out_file, RODATA1_SECTION);
6493 ASM_OUTPUT_LABEL (asm_out_file, RODATA1_END_LABEL);
6494 ASM_OUTPUT_POP_SECTION (asm_out_file);
6497 /* Output a terminator label for the .bss section. */
6499 fputc ('\n', asm_out_file);
6500 ASM_OUTPUT_PUSH_SECTION (asm_out_file, BSS_SECTION);
6501 ASM_OUTPUT_LABEL (asm_out_file, BSS_END_LABEL);
6502 ASM_OUTPUT_POP_SECTION (asm_out_file);
6504 if (debug_info_level >= DINFO_LEVEL_NORMAL)
6506 /* Output a terminating entry for the .line section. */
6508 fputc ('\n', asm_out_file);
6509 ASM_OUTPUT_PUSH_SECTION (asm_out_file, LINE_SECTION);
6510 ASM_OUTPUT_LABEL (asm_out_file, LINE_LAST_ENTRY_LABEL);
6511 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0);
6512 ASM_OUTPUT_DWARF_DATA2 (asm_out_file, 0xffff);
6513 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, TEXT_END_LABEL, TEXT_BEGIN_LABEL);
6514 ASM_OUTPUT_LABEL (asm_out_file, LINE_END_LABEL);
6515 ASM_OUTPUT_POP_SECTION (asm_out_file);
6517 if (use_gnu_debug_info_extensions)
6519 /* Output a terminating entry for the .debug_srcinfo section. */
6521 fputc ('\n', asm_out_file);
6522 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_SRCINFO_SECTION);
6523 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file,
6524 LINE_LAST_ENTRY_LABEL, LINE_BEGIN_LABEL);
6525 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, -1);
6526 ASM_OUTPUT_POP_SECTION (asm_out_file);
6529 if (debug_info_level >= DINFO_LEVEL_VERBOSE)
6531 /* Output terminating entries for the .debug_macinfo section. */
6533 dwarfout_end_source_file (0);
6535 fputc ('\n', asm_out_file);
6536 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_MACINFO_SECTION);
6537 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0);
6538 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
6539 ASM_OUTPUT_POP_SECTION (asm_out_file);
6542 /* Generate the terminating entry for the .debug_pubnames section. */
6544 fputc ('\n', asm_out_file);
6545 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_PUBNAMES_SECTION);
6546 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0);
6547 ASM_OUTPUT_DWARF_STRING_NEWLINE (asm_out_file, "");
6548 ASM_OUTPUT_POP_SECTION (asm_out_file);
6550 /* Generate the terminating entries for the .debug_aranges section.
6552 Note that we want to do this only *after* we have output the end
6553 labels (for the various program sections) which we are going to
6554 refer to here. This allows us to work around a bug in the m68k
6555 svr4 assembler. That assembler gives bogus assembly-time errors
6556 if (within any given section) you try to take the difference of
6557 two relocatable symbols, both of which are located within some
6558 other section, and if one (or both?) of the symbols involved is
6559 being forward-referenced. By generating the .debug_aranges
6560 entries at this late point in the assembly output, we skirt the
6561 issue simply by avoiding forward-references.
6564 fputc ('\n', asm_out_file);
6565 ASM_OUTPUT_PUSH_SECTION (asm_out_file, DEBUG_ARANGES_SECTION);
6567 ASM_OUTPUT_DWARF_ADDR (asm_out_file, TEXT_BEGIN_LABEL);
6568 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, TEXT_END_LABEL, TEXT_BEGIN_LABEL);
6570 ASM_OUTPUT_DWARF_ADDR (asm_out_file, DATA_BEGIN_LABEL);
6571 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, DATA_END_LABEL, DATA_BEGIN_LABEL);
6573 #if 0 /* GNU C doesn't currently use .data1. */
6574 ASM_OUTPUT_DWARF_ADDR (asm_out_file, DATA1_BEGIN_LABEL);
6575 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, DATA1_END_LABEL,
6579 ASM_OUTPUT_DWARF_ADDR (asm_out_file, RODATA_BEGIN_LABEL);
6580 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, RODATA_END_LABEL,
6581 RODATA_BEGIN_LABEL);
6583 #if 0 /* GNU C doesn't currently use .rodata1. */
6584 ASM_OUTPUT_DWARF_ADDR (asm_out_file, RODATA1_BEGIN_LABEL);
6585 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, RODATA1_END_LABEL,
6586 RODATA1_BEGIN_LABEL);
6589 ASM_OUTPUT_DWARF_ADDR (asm_out_file, BSS_BEGIN_LABEL);
6590 ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, BSS_END_LABEL, BSS_BEGIN_LABEL);
6592 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0);
6593 ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0);
6595 ASM_OUTPUT_LABEL (asm_out_file, DEBUG_ARANGES_END_LABEL);
6596 ASM_OUTPUT_POP_SECTION (asm_out_file);
6599 /* There should not be any pending types left at the end. We need
6600 this now because it may not have been checked on the last call to
6601 dwarfout_file_scope_decl. */
6602 if (pending_types != 0)
6606 #endif /* DWARF_DEBUGGING_INFO */
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