1 /* Declarations for insn-output.c. These functions are defined in recog.c,
3 Copyright (C) 1987, 1991, 1994, 1997, 1998,
4 1999, 2000, 2001 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 /* Compute branch alignments based on frequency information in the CFG. */
24 extern void compute_alignments PARAMS ((void));
26 /* Initialize data in final at the beginning of a compilation. */
27 extern void init_final PARAMS ((const char *));
29 /* Called at end of source file,
30 to output the block-profiling table for this entire compilation. */
31 extern void end_final PARAMS ((const char *));
33 /* Enable APP processing of subsequent output.
34 Used before the output from an `asm' statement. */
35 extern void app_enable PARAMS ((void));
37 /* Disable APP processing of subsequent output.
38 Called from varasm.c before most kinds of output. */
39 extern void app_disable PARAMS ((void));
41 /* Return the number of slots filled in the current
42 delayed branch sequence (we don't count the insn needing the
43 delay slot). Zero if not in a delayed branch sequence. */
44 extern int dbr_sequence_length PARAMS ((void));
46 /* Indicate that branch shortening hasn't yet been done. */
47 extern void init_insn_lengths PARAMS ((void));
50 /* Obtain the current length of an insn. If branch shortening has been done,
51 get its actual length. Otherwise, get its maximum length. */
52 extern int get_attr_length PARAMS ((rtx));
54 /* Make a pass over all insns and compute their actual lengths by shortening
55 any branches of variable length if possible. */
56 extern void shorten_branches PARAMS ((rtx));
58 /* Output assembler code for the start of a function,
59 and initialize some of the variables in this file
60 for the new function. The label for the function and associated
61 assembler pseudo-ops have already been output in
62 `assemble_start_function'. */
63 extern void final_start_function PARAMS ((rtx, FILE *, int));
65 /* Output assembler code for the end of a function.
66 For clarity, args are same as those of `final_start_function'
67 even though not all of them are needed. */
68 extern void final_end_function PARAMS ((void));
70 /* Output assembler code for some insns: all or part of a function. */
71 extern void final PARAMS ((rtx, FILE *, int, int));
73 /* The final scan for one insn, INSN. Args are same as in `final', except
74 that INSN is the insn being scanned. Value returned is the next insn to
76 extern rtx final_scan_insn PARAMS ((rtx, FILE *, int, int, int));
78 /* Replace a SUBREG with a REG or a MEM, based on the thing it is a
80 extern rtx alter_subreg PARAMS ((rtx));
82 /* Report inconsistency between the assembler template and the operands.
83 In an `asm', it's the user's fault; otherwise, the compiler's fault. */
84 extern void output_operand_lossage PARAMS ((const char *));
86 /* Output a string of assembler code, substituting insn operands.
87 Defined in final.c. */
88 extern void output_asm_insn PARAMS ((const char *, rtx *));
90 /* Compute a worst-case reference address of a branch so that it
91 can be safely used in the presence of aligned labels.
92 Defined in final.c. */
93 extern int insn_current_reference_address PARAMS ((rtx));
95 /* Find the alignment associated with a CODE_LABEL.
96 Defined in final.c. */
97 extern int label_to_alignment PARAMS ((rtx));
99 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */
100 extern void output_asm_label PARAMS ((rtx));
102 /* Print a memory reference operand for address X
103 using machine-dependent assembler syntax. */
104 extern void output_address PARAMS ((rtx));
106 /* Print an integer constant expression in assembler syntax.
107 Addition and subtraction are the only arithmetic
108 that may appear in these expressions. */
109 extern void output_addr_const PARAMS ((FILE *, rtx));
111 /* Output a string of assembler code, substituting numbers, strings
112 and fixed syntactic prefixes. */
113 extern void asm_fprintf PARAMS ((FILE *file, const char *p, ...));
115 /* Split up a CONST_DOUBLE or integer constant rtx into two rtx's for single
117 extern void split_double PARAMS ((rtx, rtx *, rtx *));
119 /* Return nonzero if this function has no function calls. */
120 extern int leaf_function_p PARAMS ((void));
122 /* Return 1 if branch is an forward branch.
123 Uses insn_shuid array, so it works only in the final pass. May be used by
124 output templates to add branch prediction hints, for example. */
125 extern int final_forward_branch_p PARAMS ((rtx));
127 /* Return 1 if this function uses only the registers that can be
128 safely renumbered. */
129 extern int only_leaf_regs_used PARAMS ((void));
131 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
132 available in leaf functions. */
133 extern void leaf_renumber_regs_insn PARAMS ((rtx));
135 /* Locate the proper template for the given insn-code. */
136 extern const char *get_insn_template PARAMS ((int, rtx));
138 /* Add function NAME to the weak symbols list. VALUE is a weak alias
139 associated with NAME. */
140 extern int add_weak PARAMS ((const char *, const char *));
142 /* Functions in flow.c */
143 extern void allocate_for_life_analysis PARAMS ((void));
144 extern int regno_uninitialized PARAMS ((int));
145 extern int regno_clobbered_at_setjmp PARAMS ((int));
146 extern void find_basic_blocks PARAMS ((rtx, int, FILE *));
147 extern bool cleanup_cfg PARAMS ((int));
148 extern void check_function_return_warnings PARAMS ((void));
151 /* Functions in varasm.c. */
153 /* Tell assembler to switch to text section. */
154 extern void text_section PARAMS ((void));
156 /* Tell assembler to switch to data section. */
157 extern void data_section PARAMS ((void));
159 /* Tell assembler to make sure its in the data section. */
160 extern void force_data_section PARAMS ((void));
162 /* Tell assembler to switch to read-only data section. This is normally
164 extern void readonly_data_section PARAMS ((void));
166 /* Determine if we're in the text section. */
167 extern int in_text_section PARAMS ((void));
169 #ifdef CTORS_SECTION_ASM_OP
170 extern void ctors_section PARAMS ((void));
173 #ifdef DTORS_SECTION_ASM_OP
174 extern void dtors_section PARAMS ((void));
177 #ifdef BSS_SECTION_ASM_OP
178 extern void bss_section PARAMS ((void));
181 #ifdef CONST_SECTION_ASM_OP
182 extern void const_section PARAMS ((void));
185 #ifdef INIT_SECTION_ASM_OP
186 extern void init_section PARAMS ((void));
189 #ifdef FINI_SECTION_ASM_OP
190 extern void fini_section PARAMS ((void));
193 #ifdef TDESC_SECTION_ASM_OP
194 extern void tdesc_section PARAMS ((void));
197 #ifdef DRECTVE_SECTION_ASM_OP
198 extern void drectve_section PARAMS ((void));
202 /* Tell assembler to change to section NAME for DECL.
203 If DECL is NULL, just switch to section NAME.
204 If NAME is NULL, get the name from DECL.
205 If RELOC is 1, the initializer for DECL contains relocs. */
206 extern void named_section PARAMS ((tree, const char *, int));
208 /* Tell assembler to switch to the section for function DECL. */
209 extern void function_section PARAMS ((tree));
211 /* Tell assembler to switch to the section for string merging. */
212 extern void mergeable_string_section PARAMS ((tree, unsigned HOST_WIDE_INT,
215 /* Tell assembler to switch to the section for constant merging. */
216 extern void mergeable_constant_section PARAMS ((enum machine_mode,
217 unsigned HOST_WIDE_INT,
220 /* Declare DECL to be a weak symbol. */
221 extern void declare_weak PARAMS ((tree));
222 #endif /* TREE_CODE */
224 /* Emit any pending weak declarations. */
225 extern void weak_finish PARAMS ((void));
227 /* Decode an `asm' spec for a declaration as a register name.
228 Return the register number, or -1 if nothing specified,
229 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
230 or -3 if ASMSPEC is `cc' and is not recognized,
231 or -4 if ASMSPEC is `memory' and is not recognized.
232 Accept an exact spelling or a decimal number.
233 Prefixes such as % are optional. */
234 extern int decode_reg_name PARAMS ((const char *));
237 /* Make the rtl for variable VAR be volatile.
238 Use this only for static variables. */
239 extern void make_var_volatile PARAMS ((tree));
241 /* Output alignment directive to align for constant expression EXP. */
242 extern void assemble_constant_align PARAMS ((tree));
244 extern void assemble_alias PARAMS ((tree, tree));
246 /* Output a string of literal assembler code
247 for an `asm' keyword used between functions. */
248 extern void assemble_asm PARAMS ((tree));
250 /* Output assembler code for the constant pool of a function and associated
251 with defining the name of the function. DECL describes the function.
252 NAME is the function's name. For the constant pool, we use the current
253 constant pool data. */
254 extern void assemble_start_function PARAMS ((tree, const char *));
256 /* Output assembler code associated with defining the size of the
257 function. DECL describes the function. NAME is the function's name. */
258 extern void assemble_end_function PARAMS ((tree, const char *));
260 /* Assemble everything that is needed for a variable or function declaration.
261 Not used for automatic variables, and not used for function definitions.
262 Should not be called for variables of incomplete structure type.
264 TOP_LEVEL is nonzero if this variable has file scope.
265 AT_END is nonzero if this is the special handling, at end of compilation,
266 to define things that have had only tentative definitions.
267 DONT_OUTPUT_DATA if nonzero means don't actually output the
268 initial value (that will be done by the caller). */
269 extern void assemble_variable PARAMS ((tree, int, int, int));
271 /* Output something to declare an external symbol to the assembler.
272 (Most assemblers don't need this, so we normally output nothing.)
273 Do nothing if DECL is not external. */
274 extern void assemble_external PARAMS ((tree));
275 #endif /* TREE_CODE */
277 /* Assemble code to leave SIZE bytes of zeros. */
278 extern void assemble_zeros PARAMS ((int));
280 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
281 extern void assemble_align PARAMS ((int));
282 extern void assemble_eh_align PARAMS ((int));
284 /* Assemble a string constant with the specified C string as contents. */
285 extern void assemble_string PARAMS ((const char *, int));
288 /* Similar, for calling a library function FUN. */
289 extern void assemble_external_libcall PARAMS ((rtx));
292 /* Declare the label NAME global. */
293 extern void assemble_global PARAMS ((const char *));
295 /* Assemble a label named NAME. */
296 extern void assemble_label PARAMS ((const char *));
297 extern void assemble_eh_label PARAMS ((const char *));
299 /* Output to FILE a reference to the assembler name of a C-level name NAME.
300 If NAME starts with a *, the rest of NAME is output verbatim.
301 Otherwise NAME is transformed in an implementation-defined way
302 (usually by the addition of an underscore).
303 Many macros in the tm file are defined to call this function. */
304 extern void assemble_name PARAMS ((FILE *, const char *));
307 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
308 the alignment of the integer in bits. Return 1 if we were able to output
309 the constant, otherwise 0. If FORCE is non-zero, abort if we can't output
311 extern int assemble_integer PARAMS ((rtx, unsigned, unsigned, int));
313 #ifdef REAL_VALUE_TYPE
314 /* Assemble the floating-point constant D into an object of size MODE. */
315 extern void assemble_real PARAMS ((REAL_VALUE_TYPE,
321 /* At the end of a function, forget the memory-constants
322 previously made for CONST_DOUBLEs. Mark them as not on real_constant_chain.
323 Also clear out real_constant_chain and clear out all the chain-pointers. */
324 extern void clear_const_double_mem PARAMS ((void));
326 /* Start deferring output of subconstants. */
327 extern void defer_addressed_constants PARAMS ((void));
329 /* Stop deferring output of subconstants,
330 and output now all those that have been deferred. */
331 extern void output_deferred_addressed_constants PARAMS ((void));
333 /* Return the size of the constant pool. */
334 extern int get_pool_size PARAMS ((void));
337 extern rtx peephole PARAMS ((rtx));
341 /* Write all the constants in the constant pool. */
342 extern void output_constant_pool PARAMS ((const char *, tree));
344 /* Return nonzero if VALUE is a valid constant-valued expression
345 for use in initializing a static variable; one that can be an
346 element of a "constant" initializer.
348 Return null_pointer_node if the value is absolute;
349 if it is relocatable, return the variable that determines the relocation.
350 We assume that VALUE has been folded as much as possible;
351 therefore, we do not need to check for such things as
352 arithmetic-combinations of integers. */
353 extern tree initializer_constant_valid_p PARAMS ((tree, tree));
355 /* Output assembler code for constant EXP to FILE, with no label.
356 This includes the pseudo-op such as ".int" or ".byte", and a newline.
357 Assumes output_addressed_constants has been done on EXP already.
359 Generate exactly SIZE bytes of assembler data, padding at the end
360 with zeros if necessary. SIZE must always be specified.
362 ALIGN is the alignment in bits that may be assumed for the data. */
363 extern void output_constant PARAMS ((tree, int, unsigned));
367 /* When outputting delayed branch sequences, this rtx holds the
368 sequence being output. It is null when no delayed branch
369 sequence is being output, so it can be used as a test in the
372 This variable is defined in final.c. */
373 extern rtx final_sequence;
376 /* The line number of the beginning of the current function. Various
377 md code needs this so that it can output relative linenumbers. */
379 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers. */
380 extern int sdb_begin_function_line;
383 /* File in which assembler code is being written. */
386 extern FILE *asm_out_file;
389 /* The first global object in the file. */
390 extern const char *first_global_object_name;
392 /* The first weak object in the file. */
393 extern const char *weak_global_object_name;
395 /* Nonzero if function being compiled doesn't contain any calls
396 (ignoring the prologue and epilogue). This is set prior to
397 local register allocation and is valid for the remaining
400 extern int current_function_is_leaf;
402 /* Nonzero if function being compiled doesn't contain any instructions
403 that can throw an exception. This is set prior to final. */
405 extern int current_function_nothrow;
407 /* Nonzero if function being compiled doesn't modify the stack pointer
408 (ignoring the prologue and epilogue). This is only valid after
409 life_analysis has run. */
411 extern int current_function_sp_is_unchanging;
413 /* Nonzero if the function being compiled is a leaf function which only
414 uses leaf registers. This is valid after reload (specifically after
415 sched2) and is useful only if the port defines LEAF_REGISTERS. */
417 extern int current_function_uses_only_leaf_regs;
419 /* Default file in which to dump debug output. */
422 extern FILE *rtl_dump_file;
425 /* Nonnull if the insn currently being emitted was a COND_EXEC pattern. */
426 extern struct rtx_def *current_insn_predicate;
428 /* Last insn processed by final_scan_insn. */
429 extern struct rtx_def *current_output_insn;
431 /* Decide whether DECL needs to be in a writable section. RELOC is the same
432 as for SELECT_SECTION. */
434 #define DECL_READONLY_SECTION(DECL,RELOC) \
435 (TREE_READONLY (DECL) \
436 && ! TREE_THIS_VOLATILE (DECL) \
437 && DECL_INITIAL (DECL) \
438 && (DECL_INITIAL (DECL) == error_mark_node \
439 || TREE_CONSTANT (DECL_INITIAL (DECL))) \
440 && ! (RELOC && (flag_pic || DECL_ONE_ONLY (DECL))))
442 /* User label prefix in effect for this compilation. */
443 extern const char *user_label_prefix;
445 /* This macro gets just the user-specified name
446 out of the string in a SYMBOL_REF. On most machines,
447 we discard the * if any and that's all. */
448 #ifndef STRIP_NAME_ENCODING
449 #define STRIP_NAME_ENCODING(VAR,SYMBOL_NAME) \
450 (VAR) = ((SYMBOL_NAME) + ((SYMBOL_NAME)[0] == '*'))
452 /* Assign unique numbers to labels generated for profiling. */
454 extern int profile_label_no;
456 /* Default target function prologue and epilogue assembler output. */
457 extern void default_function_pro_epilogue PARAMS ((FILE *, HOST_WIDE_INT));
459 /* Tell assembler to switch to the section for the exception table. */
460 extern void default_exception_section PARAMS ((void));
462 /* Tell assembler to switch to the section for the EH frames. */
463 extern void default_eh_frame_section PARAMS ((void));
465 /* Default target hook that outputs nothing to a stream. */
466 extern void no_asm_to_stream PARAMS ((FILE *));
468 /* Flags controling properties of a section. */
469 #define SECTION_ENTSIZE 0x000ff /* entity size in section */
470 #define SECTION_CODE 0x00100 /* contains code */
471 #define SECTION_WRITE 0x00200 /* data is writable */
472 #define SECTION_DEBUG 0x00400 /* contains debug data */
473 #define SECTION_LINKONCE 0x00800 /* is linkonce */
474 #define SECTION_SMALL 0x01000 /* contains "small data" */
475 #define SECTION_BSS 0x02000 /* contains zeros only */
476 #define SECTION_FORGET 0x04000 /* forget that we've entered the section */
477 #define SECTION_MERGE 0x08000 /* contains mergeable data */
478 #define SECTION_STRINGS 0x10000 /* contains zero terminated strings without
480 #define SECTION_MACH_DEP 0x20000 /* subsequent bits reserved for target */
482 extern unsigned int get_named_section_flags PARAMS ((const char *));
483 extern bool set_named_section_flags PARAMS ((const char *, unsigned int));
484 extern void named_section_flags PARAMS ((const char *, unsigned int));
485 extern bool named_section_first_declaration PARAMS((const char *));
488 extern unsigned int default_section_type_flags PARAMS ((union tree_node *,
491 extern void default_no_named_section PARAMS ((const char *, unsigned int));
492 extern void default_elf_asm_named_section PARAMS ((const char *, unsigned int));
493 extern void default_coff_asm_named_section PARAMS ((const char *,
495 extern void default_pe_asm_named_section PARAMS ((const char *, unsigned int));
497 extern void default_stabs_asm_out_destructor PARAMS ((struct rtx_def *, int));
498 extern void default_named_section_asm_out_destructor PARAMS ((struct rtx_def *,
500 extern void default_dtor_section_asm_out_destructor PARAMS ((struct rtx_def *,
502 extern void default_stabs_asm_out_constructor PARAMS ((struct rtx_def *, int));
503 extern void default_named_section_asm_out_constructor PARAMS ((struct rtx_def *,
505 extern void default_ctor_section_asm_out_constructor PARAMS ((struct rtx_def *,
508 /* Emit data for vtable gc for GNU binutils. */
509 extern void assemble_vtable_entry PARAMS ((struct rtx_def *, HOST_WIDE_INT));
510 extern void assemble_vtable_inherit PARAMS ((struct rtx_def *,