1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 88, 89, 92, 93, 94, 1995 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 /* #include <stab.h> */
38 #include "hard-reg-set.h"
46 #ifdef XCOFF_DEBUGGING_INFO
53 #define ASM_STABS_OP ".stabs"
56 /* This macro gets just the user-specified name
57 out of the string in a SYMBOL_REF. On most machines,
58 we discard the * if any and that's all. */
59 #ifndef STRIP_NAME_ENCODING
60 #define STRIP_NAME_ENCODING(VAR,SYMBOL_NAME) \
61 (VAR) = ((SYMBOL_NAME) + ((SYMBOL_NAME)[0] == '*'))
64 /* File in which assembler code is being written. */
66 extern FILE *asm_out_file;
68 /* The (assembler) name of the first globally-visible object output. */
69 char *first_global_object_name;
71 extern struct obstack *current_obstack;
72 extern struct obstack *saveable_obstack;
73 extern struct obstack *rtl_obstack;
74 extern struct obstack permanent_obstack;
75 #define obstack_chunk_alloc xmalloc
77 /* Number for making the label on the next
78 constant that is stored in memory. */
82 /* Number for making the label on the next
83 static variable internal to a function. */
87 /* Carry information from ASM_DECLARE_OBJECT_NAME
88 to ASM_FINISH_DECLARE_OBJECT. */
90 int size_directive_output;
92 /* The last decl for which assemble_variable was called,
93 if it did ASM_DECLARE_OBJECT_NAME.
94 If the last call to assemble_variable didn't do that,
97 tree last_assemble_variable_decl;
99 /* Nonzero if at least one function definition has been seen. */
100 static int function_defined;
103 struct constant_descriptor;
105 struct pool_constant;
107 static void bc_make_decl_rtl PROTO((tree, char *, int));
108 static char *strip_reg_name PROTO((char *));
109 static void bc_output_ascii PROTO((FILE *, char *, int));
110 static int contains_pointers_p PROTO((tree));
111 static void decode_addr_const PROTO((tree, struct addr_const *));
112 static int const_hash PROTO((tree));
113 static int compare_constant PROTO((tree,
114 struct constant_descriptor *));
115 static char *compare_constant_1 PROTO((tree, char *));
116 static struct constant_descriptor *record_constant PROTO((tree));
117 static void record_constant_1 PROTO((tree));
118 static tree copy_constant PROTO((tree));
119 static void output_constant_def_contents PROTO((tree, int, int));
120 static void decode_rtx_const PROTO((enum machine_mode, rtx,
121 struct rtx_const *));
122 static int const_hash_rtx PROTO((enum machine_mode, rtx));
123 static int compare_constant_rtx PROTO((enum machine_mode, rtx,
124 struct constant_descriptor *));
125 static struct constant_descriptor *record_constant_rtx PROTO((enum machine_mode,
127 static struct pool_constant *find_pool_constant PROTO((rtx));
128 static int output_addressed_constants PROTO((tree));
129 static void bc_assemble_integer PROTO((tree, int));
130 static void output_constructor PROTO((tree, int));
132 #ifdef EXTRA_SECTIONS
133 static enum in_section {no_section, in_text, in_data, in_named, EXTRA_SECTIONS} in_section
136 static enum in_section {no_section, in_text, in_data, in_named} in_section
140 /* Return a non-zero value if DECL has a section attribute. */
141 #define IN_NAMED_SECTION(DECL) \
142 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
143 && DECL_SECTION_NAME (DECL) != NULL_TREE)
145 /* Text of section name when in_section == in_named. */
146 static char *in_named_name;
148 /* Define functions like text_section for any extra sections. */
149 #ifdef EXTRA_SECTION_FUNCTIONS
150 EXTRA_SECTION_FUNCTIONS
153 /* Tell assembler to switch to text section. */
158 if (in_section != in_text)
163 fprintf (asm_out_file, "%s\n", TEXT_SECTION_ASM_OP);
165 in_section = in_text;
169 /* Tell assembler to switch to data section. */
174 if (in_section != in_data)
180 if (flag_shared_data)
182 #ifdef SHARED_SECTION_ASM_OP
183 fprintf (asm_out_file, "%s\n", SHARED_SECTION_ASM_OP);
185 fprintf (asm_out_file, "%s\n", DATA_SECTION_ASM_OP);
189 fprintf (asm_out_file, "%s\n", DATA_SECTION_ASM_OP);
192 in_section = in_data;
196 /* Tell assembler to switch to read-only data section. This is normally
200 readonly_data_section ()
202 #ifdef READONLY_DATA_SECTION
203 READONLY_DATA_SECTION (); /* Note this can call data_section. */
209 /* Determine if we're in the text section. */
214 return in_section == in_text;
217 /* Tell assembler to change to section NAME for DECL.
218 If DECL is NULL, just switch to section NAME.
219 If NAME is NULL, get the name from DECL. */
222 named_section (decl, name)
226 if (decl != NULL_TREE
227 && (TREE_CODE (decl) != FUNCTION_DECL && TREE_CODE (decl) != VAR_DECL))
230 name = TREE_STRING_POINTER (DECL_SECTION_NAME (decl));
232 if (in_section != in_named || strcmp (name, in_named_name))
234 in_named_name = name;
235 in_section = in_named;
237 #ifdef ASM_OUTPUT_SECTION_NAME
238 ASM_OUTPUT_SECTION_NAME (asm_out_file, decl, name);
240 /* Section attributes are not supported if this macro isn't provided -
241 some host formats don't support them at all. The front-end should
242 already have flagged this as an error. */
248 /* Switch to the section for function DECL.
250 If DECL is NULL_TREE, switch to the text section.
251 ??? It's not clear that we will ever be passed NULL_TREE, but it's
252 safer to handle it. */
255 function_section (decl)
258 if (decl != NULL_TREE
259 && DECL_SECTION_NAME (decl) != NULL_TREE)
260 named_section (decl, (char *) 0);
265 /* Create the rtl to represent a function, for a function definition.
266 DECL is a FUNCTION_DECL node which describes which function.
267 The rtl is stored into DECL. */
270 make_function_rtl (decl)
273 char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
277 if (DECL_RTL (decl) == 0)
278 DECL_RTL (decl) = bc_gen_rtx (name, 0, (struct bc_label *) 0);
280 /* Record that at least one function has been defined. */
281 function_defined = 1;
285 /* Rename a nested function to avoid conflicts. */
286 if (decl_function_context (decl) != 0
287 && DECL_INITIAL (decl) != 0
288 && DECL_RTL (decl) == 0)
292 name = IDENTIFIER_POINTER (DECL_NAME (decl));
293 ASM_FORMAT_PRIVATE_NAME (label, name, var_labelno);
294 name = obstack_copy0 (saveable_obstack, label, strlen (label));
298 if (DECL_RTL (decl) == 0)
301 = gen_rtx (MEM, DECL_MODE (decl),
302 gen_rtx (SYMBOL_REF, Pmode, name));
304 /* Optionally set flags or add text to the name to record information
305 such as that it is a function name. If the name is changed, the macro
306 ASM_OUTPUT_LABELREF will have to know how to strip this information. */
307 #ifdef ENCODE_SECTION_INFO
308 ENCODE_SECTION_INFO (decl);
312 /* Record at least one function has been defined. */
313 function_defined = 1;
316 /* Create the DECL_RTL for a declaration for a static or external
317 variable or static or external function.
318 ASMSPEC, if not 0, is the string which the user specified
319 as the assembler symbol name.
320 TOP_LEVEL is nonzero if this is a file-scope variable.
321 This is never called for PARM_DECLs. */
324 bc_make_decl_rtl (decl, asmspec, top_level)
329 register char *name = TREE_STRING_POINTER (DECL_ASSEMBLER_NAME (decl));
331 if (DECL_RTL (decl) == 0)
333 /* Print an error message for register variables. */
334 if (DECL_REGISTER (decl) && TREE_CODE (decl) == FUNCTION_DECL)
335 error ("function declared `register'");
336 else if (DECL_REGISTER (decl))
337 error ("global register variables not supported in the interpreter");
339 /* Handle ordinary static variables and functions. */
340 if (DECL_RTL (decl) == 0)
342 /* Can't use just the variable's own name for a variable
343 whose scope is less than the whole file.
344 Concatenate a distinguishing number. */
345 if (!top_level && !DECL_EXTERNAL (decl) && asmspec == 0)
349 ASM_FORMAT_PRIVATE_NAME (label, name, var_labelno);
350 name = obstack_copy0 (saveable_obstack, label, strlen (label));
354 DECL_RTL (decl) = bc_gen_rtx (name, 0, (struct bc_label *) 0);
359 /* Given NAME, a putative register name, discard any customary prefixes. */
362 strip_reg_name (name)
365 #ifdef REGISTER_PREFIX
366 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
367 name += strlen (REGISTER_PREFIX);
369 if (name[0] == '%' || name[0] == '#')
374 /* Decode an `asm' spec for a declaration as a register name.
375 Return the register number, or -1 if nothing specified,
376 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
377 or -3 if ASMSPEC is `cc' and is not recognized,
378 or -4 if ASMSPEC is `memory' and is not recognized.
379 Accept an exact spelling or a decimal number.
380 Prefixes such as % are optional. */
383 decode_reg_name (asmspec)
390 /* Get rid of confusing prefixes. */
391 asmspec = strip_reg_name (asmspec);
393 /* Allow a decimal number as a "register name". */
394 for (i = strlen (asmspec) - 1; i >= 0; i--)
395 if (! (asmspec[i] >= '0' && asmspec[i] <= '9'))
397 if (asmspec[0] != 0 && i < 0)
400 if (i < FIRST_PSEUDO_REGISTER && i >= 0)
406 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
408 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
411 #ifdef ADDITIONAL_REGISTER_NAMES
413 static struct { char *name; int number; } table[]
414 = ADDITIONAL_REGISTER_NAMES;
416 for (i = 0; i < sizeof (table) / sizeof (table[0]); i++)
417 if (! strcmp (asmspec, table[i].name))
418 return table[i].number;
420 #endif /* ADDITIONAL_REGISTER_NAMES */
422 if (!strcmp (asmspec, "memory"))
425 if (!strcmp (asmspec, "cc"))
434 /* Create the DECL_RTL for a declaration for a static or external variable
435 or static or external function.
436 ASMSPEC, if not 0, is the string which the user specified
437 as the assembler symbol name.
438 TOP_LEVEL is nonzero if this is a file-scope variable.
440 This is never called for PARM_DECL nodes. */
443 make_decl_rtl (decl, asmspec, top_level)
448 register char *name = 0;
453 bc_make_decl_rtl (decl, asmspec, top_level);
457 reg_number = decode_reg_name (asmspec);
459 if (DECL_ASSEMBLER_NAME (decl) != NULL_TREE)
460 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
462 if (reg_number == -2)
464 /* ASMSPEC is given, and not the name of a register. */
465 name = (char *) obstack_alloc (saveable_obstack,
466 strlen (asmspec) + 2);
468 strcpy (&name[1], asmspec);
471 /* For a duplicate declaration, we can be called twice on the
472 same DECL node. Don't discard the RTL already made. */
473 if (DECL_RTL (decl) == 0)
477 /* First detect errors in declaring global registers. */
478 if (DECL_REGISTER (decl) && reg_number == -1)
479 error_with_decl (decl,
480 "register name not specified for `%s'");
481 else if (DECL_REGISTER (decl) && reg_number < 0)
482 error_with_decl (decl,
483 "invalid register name for `%s'");
484 else if ((reg_number >= 0 || reg_number == -3) && ! DECL_REGISTER (decl))
485 error_with_decl (decl,
486 "register name given for non-register variable `%s'");
487 else if (DECL_REGISTER (decl) && TREE_CODE (decl) == FUNCTION_DECL)
488 error ("function declared `register'");
489 else if (DECL_REGISTER (decl) && TYPE_MODE (TREE_TYPE (decl)) == BLKmode)
490 error_with_decl (decl, "data type of `%s' isn't suitable for a register");
491 else if (DECL_REGISTER (decl)
492 && ! HARD_REGNO_MODE_OK (reg_number, TYPE_MODE (TREE_TYPE (decl))))
493 error_with_decl (decl, "register number for `%s' isn't suitable for the data type");
494 /* Now handle properly declared static register variables. */
495 else if (DECL_REGISTER (decl))
498 #if 0 /* yylex should print the warning for this */
500 pedwarn ("ANSI C forbids global register variables");
502 if (DECL_INITIAL (decl) != 0 && top_level)
504 DECL_INITIAL (decl) = 0;
505 error ("global register variable has initial value");
507 if (fixed_regs[reg_number] == 0
508 && function_defined && top_level)
509 error ("global register variable follows a function definition");
510 if (TREE_THIS_VOLATILE (decl))
511 warning ("volatile register variables don't work as you might wish");
513 /* If the user specified one of the eliminables registers here,
514 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
515 confused with that register and be eliminated. Although this
516 usage is somewhat suspect, we nevertheless use the following
517 kludge to avoid setting DECL_RTL to frame_pointer_rtx. */
520 = gen_rtx (REG, DECL_MODE (decl), FIRST_PSEUDO_REGISTER);
521 REGNO (DECL_RTL (decl)) = reg_number;
522 REG_USERVAR_P (DECL_RTL (decl)) = 1;
526 /* Make this register global, so not usable for anything
528 nregs = HARD_REGNO_NREGS (reg_number, DECL_MODE (decl));
530 globalize_reg (reg_number + --nregs);
533 /* Specifying a section attribute on an uninitialized variable does not
534 (and cannot) cause it to be put in the given section. The linker
535 can only put initialized objects in specific sections, everything
536 else goes in bss for the linker to sort out later (otherwise the
537 linker would give a duplicate definition error for each compilation
538 unit that behaved thusly). So warn the user. */
539 else if (TREE_CODE (decl) == VAR_DECL
540 && DECL_SECTION_NAME (decl) != NULL_TREE
541 && DECL_INITIAL (decl) == NULL_TREE)
543 warning_with_decl (decl,
544 "section attribute ignored for uninitialized variable `%s'");
545 /* Remove the section name so subsequent declarations won't see it.
546 We are ignoring it, remember. */
547 DECL_SECTION_NAME (decl) = NULL_TREE;
550 /* Now handle ordinary static variables and functions (in memory).
551 Also handle vars declared register invalidly. */
552 if (DECL_RTL (decl) == 0)
554 /* Can't use just the variable's own name for a variable
555 whose scope is less than the whole file.
556 Concatenate a distinguishing number. */
557 if (!top_level && !DECL_EXTERNAL (decl) && asmspec == 0)
561 ASM_FORMAT_PRIVATE_NAME (label, name, var_labelno);
562 name = obstack_copy0 (saveable_obstack, label, strlen (label));
569 DECL_RTL (decl) = gen_rtx (MEM, DECL_MODE (decl),
570 gen_rtx (SYMBOL_REF, Pmode, name));
572 /* If this variable is to be treated as volatile, show its
573 tree node has side effects. If it has side effects, either
574 because of this test or from TREE_THIS_VOLATILE also
575 being set, show the MEM is volatile. */
576 if (flag_volatile_global && TREE_CODE (decl) == VAR_DECL
577 && TREE_PUBLIC (decl))
578 TREE_SIDE_EFFECTS (decl) = 1;
579 if (TREE_SIDE_EFFECTS (decl))
580 MEM_VOLATILE_P (DECL_RTL (decl)) = 1;
582 if (TREE_READONLY (decl))
583 RTX_UNCHANGING_P (DECL_RTL (decl)) = 1;
584 MEM_IN_STRUCT_P (DECL_RTL (decl))
585 = AGGREGATE_TYPE_P (TREE_TYPE (decl));
587 /* Optionally set flags or add text to the name to record information
588 such as that it is a function name.
589 If the name is changed, the macro ASM_OUTPUT_LABELREF
590 will have to know how to strip this information. */
591 #ifdef ENCODE_SECTION_INFO
592 ENCODE_SECTION_INFO (decl);
596 /* If the old RTL had the wrong mode, fix the mode. */
597 else if (GET_MODE (DECL_RTL (decl)) != DECL_MODE (decl))
599 rtx rtl = DECL_RTL (decl);
600 PUT_MODE (rtl, DECL_MODE (decl));
604 /* Make the rtl for variable VAR be volatile.
605 Use this only for static variables. */
608 make_var_volatile (var)
611 if (GET_CODE (DECL_RTL (var)) != MEM)
614 MEM_VOLATILE_P (DECL_RTL (var)) = 1;
617 /* Output alignment directive to align for constant expression EXP. */
620 assemble_constant_align (exp)
625 /* Align the location counter as required by EXP's data type. */
626 align = TYPE_ALIGN (TREE_TYPE (exp));
627 #ifdef CONSTANT_ALIGNMENT
628 align = CONSTANT_ALIGNMENT (exp, align);
631 if (align > BITS_PER_UNIT)
632 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
635 /* Output a string of literal assembler code
636 for an `asm' keyword used between functions. */
639 assemble_asm (string)
644 error ("asm statements not allowed in interpreter");
650 if (TREE_CODE (string) == ADDR_EXPR)
651 string = TREE_OPERAND (string, 0);
653 fprintf (asm_out_file, "\t%s\n", TREE_STRING_POINTER (string));
656 #if 0 /* This should no longer be needed, because
657 flag_gnu_linker should be 0 on these systems,
658 which should prevent any output
659 if ASM_OUTPUT_CONSTRUCTOR and ASM_OUTPUT_DESTRUCTOR are absent. */
660 #if !(defined(DBX_DEBUGGING_INFO) && !defined(FASCIST_ASSEMBLER))
661 #ifndef ASM_OUTPUT_CONSTRUCTOR
662 #define ASM_OUTPUT_CONSTRUCTOR(file, name)
664 #ifndef ASM_OUTPUT_DESTRUCTOR
665 #define ASM_OUTPUT_DESTRUCTOR(file, name)
670 /* Record an element in the table of global destructors.
671 How this is done depends on what sort of assembler and linker
674 NAME should be the name of a global function to be called
675 at exit time. This name is output using assemble_name. */
678 assemble_destructor (name)
681 #ifdef ASM_OUTPUT_DESTRUCTOR
682 ASM_OUTPUT_DESTRUCTOR (asm_out_file, name);
686 /* Now tell GNU LD that this is part of the static destructor set. */
687 /* This code works for any machine provided you use GNU as/ld. */
688 fprintf (asm_out_file, "%s \"___DTOR_LIST__\",22,0,0,", ASM_STABS_OP);
689 assemble_name (asm_out_file, name);
690 fputc ('\n', asm_out_file);
695 /* Likewise for global constructors. */
698 assemble_constructor (name)
701 #ifdef ASM_OUTPUT_CONSTRUCTOR
702 ASM_OUTPUT_CONSTRUCTOR (asm_out_file, name);
706 /* Now tell GNU LD that this is part of the static constructor set. */
707 /* This code works for any machine provided you use GNU as/ld. */
708 fprintf (asm_out_file, "%s \"___CTOR_LIST__\",22,0,0,", ASM_STABS_OP);
709 assemble_name (asm_out_file, name);
710 fputc ('\n', asm_out_file);
715 /* Likewise for entries we want to record for garbage collection.
716 Garbage collection is still under development. */
719 assemble_gc_entry (name)
722 #ifdef ASM_OUTPUT_GC_ENTRY
723 ASM_OUTPUT_GC_ENTRY (asm_out_file, name);
727 /* Now tell GNU LD that this is part of the static constructor set. */
728 fprintf (asm_out_file, "%s \"___PTR_LIST__\",22,0,0,", ASM_STABS_OP);
729 assemble_name (asm_out_file, name);
730 fputc ('\n', asm_out_file);
735 /* Output assembler code for the constant pool of a function and associated
736 with defining the name of the function. DECL describes the function.
737 NAME is the function's name. For the constant pool, we use the current
738 constant pool data. */
741 assemble_start_function (decl, fnname)
747 /* The following code does not need preprocessing in the assembler. */
751 output_constant_pool (fnname, decl);
753 function_section (decl);
755 /* Tell assembler to move to target machine's alignment for functions. */
756 align = floor_log2 (FUNCTION_BOUNDARY / BITS_PER_UNIT);
760 BC_OUTPUT_ALIGN (asm_out_file, align);
762 ASM_OUTPUT_ALIGN (asm_out_file, align);
765 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
766 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
769 #ifdef SDB_DEBUGGING_INFO
770 /* Output SDB definition of the function. */
771 if (write_symbols == SDB_DEBUG)
772 sdbout_mark_begin_function ();
775 #ifdef DBX_DEBUGGING_INFO
776 /* Output DBX definition of the function. */
777 if (write_symbols == DBX_DEBUG)
778 dbxout_begin_function (decl);
781 /* Make function name accessible from other files, if appropriate. */
783 if (TREE_PUBLIC (decl))
785 if (!first_global_object_name)
786 STRIP_NAME_ENCODING (first_global_object_name, fnname);
788 BC_GLOBALIZE_LABEL (asm_out_file, fnname);
790 ASM_GLOBALIZE_LABEL (asm_out_file, fnname);
793 /* Do any machine/system dependent processing of the function name */
794 #ifdef ASM_DECLARE_FUNCTION_NAME
795 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
797 /* Standard thing is just output label for the function. */
799 BC_OUTPUT_LABEL (asm_out_file, fnname);
801 ASM_OUTPUT_LABEL (asm_out_file, fnname);
802 #endif /* ASM_DECLARE_FUNCTION_NAME */
805 /* Output assembler code associated with defining the size of the
806 function. DECL describes the function. NAME is the function's name. */
809 assemble_end_function (decl, fnname)
813 #ifdef ASM_DECLARE_FUNCTION_SIZE
814 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
818 /* Assemble code to leave SIZE bytes of zeros. */
821 assemble_zeros (size)
826 bc_emit_const_skip (size);
830 #ifdef ASM_NO_SKIP_IN_TEXT
831 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
832 so we must output 0s explicitly in the text section. */
833 if (ASM_NO_SKIP_IN_TEXT && in_text_section ())
837 for (i = 0; i < size - 20; i += 20)
840 fprintf (asm_out_file,
841 "%s 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\n", ASM_BYTE_OP);
843 fprintf (asm_out_file,
844 "\tbyte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\n");
850 fprintf (asm_out_file, "%s 0", ASM_BYTE_OP);
852 fprintf (asm_out_file, "\tbyte 0");
855 for (; i < size; i++)
856 fprintf (asm_out_file, ",0");
857 fprintf (asm_out_file, "\n");
865 BC_OUTPUT_SKIP (asm_out_file, size);
867 ASM_OUTPUT_SKIP (asm_out_file, size);
871 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
874 assemble_align (align)
877 if (align > BITS_PER_UNIT)
878 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
881 /* Assemble a string constant with the specified C string as contents. */
884 assemble_string (p, size)
898 /* If the string is very long, split it up. */
902 int thissize = size - pos;
903 if (thissize > maximum)
907 bc_output_ascii (asm_out_file, p, thissize);
910 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
919 bc_output_ascii (file, p, size)
924 BC_OUTPUT_ASCII (file, p, size);
927 /* Assemble everything that is needed for a variable or function declaration.
928 Not used for automatic variables, and not used for function definitions.
929 Should not be called for variables of incomplete structure type.
931 TOP_LEVEL is nonzero if this variable has file scope.
932 AT_END is nonzero if this is the special handling, at end of compilation,
933 to define things that have had only tentative definitions.
934 DONT_OUTPUT_DATA if nonzero means don't actually output the
935 initial value (that will be done by the caller). */
938 assemble_variable (decl, top_level, at_end, dont_output_data)
942 int dont_output_data;
948 enum in_section saved_in_section;
950 last_assemble_variable_decl = 0;
955 if (GET_CODE (DECL_RTL (decl)) == REG)
957 /* Do output symbol info for global register variables, but do nothing
960 if (TREE_ASM_WRITTEN (decl))
962 TREE_ASM_WRITTEN (decl) = 1;
964 if (!output_bytecode)
966 #if defined (DBX_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO)
967 /* File-scope global variables are output here. */
968 if ((write_symbols == DBX_DEBUG || write_symbols == XCOFF_DEBUG)
970 dbxout_symbol (decl, 0);
972 #ifdef SDB_DEBUGGING_INFO
973 if (write_symbols == SDB_DEBUG && top_level
974 /* Leave initialized global vars for end of compilation;
975 see comment in compile_file. */
976 && (TREE_PUBLIC (decl) == 0 || DECL_INITIAL (decl) == 0))
977 sdbout_symbol (decl, 0);
981 /* Don't output any DWARF debugging information for variables here.
982 In the case of local variables, the information for them is output
983 when we do our recursive traversal of the tree representation for
984 the entire containing function. In the case of file-scope variables,
985 we output information for all of them at the very end of compilation
986 while we are doing our final traversal of the chain of file-scope
992 /* Normally no need to say anything here for external references,
993 since assemble_external is called by the langauge-specific code
994 when a declaration is first seen. */
996 if (DECL_EXTERNAL (decl))
999 /* Output no assembler code for a function declaration.
1000 Only definitions of functions output anything. */
1002 if (TREE_CODE (decl) == FUNCTION_DECL)
1005 /* If type was incomplete when the variable was declared,
1006 see if it is complete now. */
1008 if (DECL_SIZE (decl) == 0)
1009 layout_decl (decl, 0);
1011 /* Still incomplete => don't allocate it; treat the tentative defn
1012 (which is what it must have been) as an `extern' reference. */
1014 if (!dont_output_data && DECL_SIZE (decl) == 0)
1016 error_with_file_and_line (DECL_SOURCE_FILE (decl),
1017 DECL_SOURCE_LINE (decl),
1018 "storage size of `%s' isn't known",
1019 IDENTIFIER_POINTER (DECL_NAME (decl)));
1020 TREE_ASM_WRITTEN (decl) = 1;
1024 /* The first declaration of a variable that comes through this function
1025 decides whether it is global (in C, has external linkage)
1026 or local (in C, has internal linkage). So do nothing more
1027 if this function has already run. */
1029 if (TREE_ASM_WRITTEN (decl))
1032 TREE_ASM_WRITTEN (decl) = 1;
1036 if (! dont_output_data)
1038 if (TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)
1041 /* This is better than explicit arithmetic, since it avoids overflow. */
1042 size_tree = size_binop (CEIL_DIV_EXPR,
1043 DECL_SIZE (decl), size_int (BITS_PER_UNIT));
1045 if (TREE_INT_CST_HIGH (size_tree) != 0)
1047 error_with_decl (decl, "size of variable `%s' is too large");
1052 name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
1054 /* Handle uninitialized definitions. */
1056 /* ANSI specifies that a tentative definition which is not merged with
1057 a non-tentative definition behaves exactly like a definition with an
1058 initializer equal to zero. (Section 3.7.2)
1059 -fno-common gives strict ANSI behavior. Usually you don't want it.
1060 This matters only for variables with external linkage. */
1061 if ((! flag_no_common || ! TREE_PUBLIC (decl))
1062 && DECL_COMMON (decl)
1063 && ! dont_output_data
1064 && (DECL_INITIAL (decl) == 0 || DECL_INITIAL (decl) == error_mark_node))
1066 int size = TREE_INT_CST_LOW (size_tree);
1069 if (TREE_INT_CST_HIGH (size_tree) != 0)
1070 error_with_decl (decl, "size of variable `%s' is too large");
1071 /* Don't allocate zero bytes of common,
1072 since that means "undefined external" in the linker. */
1073 if (size == 0) rounded = 1;
1074 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1075 so that each uninitialized object starts on such a boundary. */
1076 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
1077 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1078 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1080 #ifdef DBX_DEBUGGING_INFO
1081 /* File-scope global variables are output here. */
1082 if (write_symbols == DBX_DEBUG && top_level)
1083 dbxout_symbol (decl, 0);
1085 #ifdef SDB_DEBUGGING_INFO
1086 if (write_symbols == SDB_DEBUG && top_level
1087 /* Leave initialized global vars for end of compilation;
1088 see comment in compile_file. */
1089 && (TREE_PUBLIC (decl) == 0 || DECL_INITIAL (decl) == 0))
1090 sdbout_symbol (decl, 0);
1093 /* Don't output any DWARF debugging information for variables here.
1094 In the case of local variables, the information for them is output
1095 when we do our recursive traversal of the tree representation for
1096 the entire containing function. In the case of file-scope variables,
1097 we output information for all of them at the very end of compilation
1098 while we are doing our final traversal of the chain of file-scope
1102 if (flag_shared_data)
1105 if (TREE_PUBLIC (decl))
1107 #ifdef ASM_OUTPUT_SHARED_COMMON
1108 if (flag_shared_data)
1109 ASM_OUTPUT_SHARED_COMMON (asm_out_file, name, size, rounded);
1112 if (output_bytecode)
1114 BC_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1118 #ifdef ASM_OUTPUT_ALIGNED_COMMON
1119 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size,
1122 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1128 #ifdef ASM_OUTPUT_SHARED_LOCAL
1129 if (flag_shared_data)
1130 ASM_OUTPUT_SHARED_LOCAL (asm_out_file, name, size, rounded);
1133 if (output_bytecode)
1135 BC_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1139 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
1140 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size,
1143 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1150 /* Handle initialized definitions. */
1152 /* First make the assembler name(s) global if appropriate. */
1153 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
1155 if (!first_global_object_name)
1156 STRIP_NAME_ENCODING(first_global_object_name, name);
1157 ASM_GLOBALIZE_LABEL (asm_out_file, name);
1160 for (d = equivalents; d; d = TREE_CHAIN (d))
1162 tree e = TREE_VALUE (d);
1163 if (TREE_PUBLIC (e) && DECL_NAME (e))
1164 ASM_GLOBALIZE_LABEL (asm_out_file,
1165 XSTR (XEXP (DECL_RTL (e), 0), 0));
1169 /* Output any data that we will need to use the address of. */
1170 if (DECL_INITIAL (decl) == error_mark_node)
1171 reloc = contains_pointers_p (TREE_TYPE (decl));
1172 else if (DECL_INITIAL (decl))
1173 reloc = output_addressed_constants (DECL_INITIAL (decl));
1175 /* Switch to the proper section for this data. */
1176 if (IN_NAMED_SECTION (decl))
1177 named_section (decl, NULL);
1180 /* C++ can have const variables that get initialized from constructors,
1181 and thus can not be in a readonly section. We prevent this by
1182 verifying that the initial value is constant for objects put in a
1185 error_mark_node is used by the C front end to indicate that the
1186 initializer has not been seen yet. In this case, we assume that
1187 the initializer must be constant. */
1188 #ifdef SELECT_SECTION
1189 SELECT_SECTION (decl, reloc);
1191 if (TREE_READONLY (decl)
1192 && ! TREE_THIS_VOLATILE (decl)
1193 && DECL_INITIAL (decl)
1194 && (DECL_INITIAL (decl) == error_mark_node
1195 || TREE_CONSTANT (DECL_INITIAL (decl)))
1196 && ! (flag_pic && reloc))
1197 readonly_data_section ();
1203 /* dbxout.c needs to know this. */
1204 if (in_text_section ())
1205 DECL_IN_TEXT_SECTION (decl) = 1;
1207 /* Record current section so we can restore it if dbxout.c clobbers it. */
1208 saved_in_section = in_section;
1210 /* Output the dbx info now that we have chosen the section. */
1212 #ifdef DBX_DEBUGGING_INFO
1213 /* File-scope global variables are output here. */
1214 if (write_symbols == DBX_DEBUG && top_level)
1215 dbxout_symbol (decl, 0);
1217 #ifdef SDB_DEBUGGING_INFO
1218 if (write_symbols == SDB_DEBUG && top_level
1219 /* Leave initialized global vars for end of compilation;
1220 see comment in compile_file. */
1221 && (TREE_PUBLIC (decl) == 0 || DECL_INITIAL (decl) == 0))
1222 sdbout_symbol (decl, 0);
1225 /* Don't output any DWARF debugging information for variables here.
1226 In the case of local variables, the information for them is output
1227 when we do our recursive traversal of the tree representation for
1228 the entire containing function. In the case of file-scope variables,
1229 we output information for all of them at the very end of compilation
1230 while we are doing our final traversal of the chain of file-scope
1233 /* If the debugging output changed sections, reselect the section
1234 that's supposed to be selected. */
1235 if (in_section != saved_in_section)
1237 /* Switch to the proper section for this data. */
1238 #ifdef SELECT_SECTION
1239 SELECT_SECTION (decl, reloc);
1241 if (TREE_READONLY (decl)
1242 && ! TREE_THIS_VOLATILE (decl)
1243 && DECL_INITIAL (decl)
1244 && (DECL_INITIAL (decl) == error_mark_node
1245 || TREE_CONSTANT (DECL_INITIAL (decl)))
1246 && ! (flag_pic && reloc))
1247 readonly_data_section ();
1253 /* Compute and output the alignment of this data. */
1255 align = DECL_ALIGN (decl);
1256 /* In the case for initialing an array whose length isn't specified,
1257 where we have not yet been able to do the layout,
1258 figure out the proper alignment now. */
1259 if (dont_output_data && DECL_SIZE (decl) == 0
1260 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1261 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1263 /* Some object file formats have a maximum alignment which they support.
1264 In particular, a.out format supports a maximum alignment of 4. */
1265 #ifndef MAX_OFILE_ALIGNMENT
1266 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
1268 if (align > MAX_OFILE_ALIGNMENT)
1270 warning_with_decl (decl,
1271 "alignment of `%s' is greater than maximum object file alignment");
1272 align = MAX_OFILE_ALIGNMENT;
1274 #ifdef DATA_ALIGNMENT
1275 /* On some machines, it is good to increase alignment sometimes. */
1276 align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1278 #ifdef CONSTANT_ALIGNMENT
1279 if (DECL_INITIAL (decl))
1280 align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align);
1283 /* Reset the alignment in case we have made it tighter, so we can benefit
1284 from it in get_pointer_alignment. */
1285 DECL_ALIGN (decl) = align;
1287 if (align > BITS_PER_UNIT)
1289 if (output_bytecode)
1290 BC_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1292 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1295 /* Do any machine/system dependent processing of the object. */
1296 #ifdef ASM_DECLARE_OBJECT_NAME
1297 last_assemble_variable_decl = decl;
1298 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
1300 /* Standard thing is just output label for the object. */
1301 if (output_bytecode)
1302 BC_OUTPUT_LABEL (asm_out_file, name);
1304 ASM_OUTPUT_LABEL (asm_out_file, name);
1305 #endif /* ASM_DECLARE_OBJECT_NAME */
1307 if (!dont_output_data)
1309 if (DECL_INITIAL (decl))
1310 /* Output the actual data. */
1311 output_constant (DECL_INITIAL (decl), TREE_INT_CST_LOW (size_tree));
1313 /* Leave space for it. */
1314 assemble_zeros (TREE_INT_CST_LOW (size_tree));
1318 #ifdef XCOFF_DEBUGGING_INFO
1319 /* Unfortunately, the IBM assembler cannot handle stabx before the actual
1320 declaration. When something like ".stabx "aa:S-2",aa,133,0" is emitted
1321 and `aa' hasn't been output yet, the assembler generates a stab entry with
1322 a value of zero, in addition to creating an unnecessary external entry
1323 for `aa'. Hence, we must postpone dbxout_symbol to here at the end. */
1325 /* File-scope global variables are output here. */
1326 if (write_symbols == XCOFF_DEBUG && top_level)
1328 saved_in_section = in_section;
1330 dbxout_symbol (decl, 0);
1332 if (in_section != saved_in_section)
1334 /* Switch to the proper section for this data. */
1335 #ifdef SELECT_SECTION
1336 SELECT_SECTION (decl, reloc);
1338 if (TREE_READONLY (decl)
1339 && ! TREE_THIS_VOLATILE (decl)
1340 && DECL_INITIAL (decl)
1341 && (DECL_INITIAL (decl) == error_mark_node
1342 || TREE_CONSTANT (DECL_INITIAL (decl)))
1343 && ! (flag_pic && reloc))
1344 readonly_data_section ();
1351 /* There must be a statement after a label. */
1356 /* Return 1 if type TYPE contains any pointers. */
1359 contains_pointers_p (type)
1362 switch (TREE_CODE (type))
1365 case REFERENCE_TYPE:
1366 /* I'm not sure whether OFFSET_TYPE needs this treatment,
1367 so I'll play safe and return 1. */
1373 case QUAL_UNION_TYPE:
1376 /* For a type that has fields, see if the fields have pointers. */
1377 for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
1378 if (TREE_CODE (fields) == FIELD_DECL
1379 && contains_pointers_p (TREE_TYPE (fields)))
1385 /* An array type contains pointers if its element type does. */
1386 return contains_pointers_p (TREE_TYPE (type));
1393 /* Output text storage for constructor CONSTR. */
1396 bc_output_constructor (constr, size)
1402 /* Must always be a literal; non-literal constructors are handled
1405 if (!TREE_CONSTANT (constr))
1412 for (i = 0; TYPE_ALIGN (constr) >= BITS_PER_UNIT << (i + 1); i++)
1416 BC_OUTPUT_ALIGN (asm_out_file, i);
1419 output_constant (constr, size);
1422 /* Create storage for constructor CONSTR. */
1425 bc_output_data_constructor (constr)
1430 /* Put in data section */
1434 for (i = 0; TYPE_ALIGN (constr) >= BITS_PER_UNIT << (i + 1); i++);
1436 BC_OUTPUT_ALIGN (asm_out_file, i);
1438 /* The constructor is filled in at runtime. */
1439 BC_OUTPUT_SKIP (asm_out_file, int_size_in_bytes (TREE_TYPE (constr)));
1442 /* Output something to declare an external symbol to the assembler.
1443 (Most assemblers don't need this, so we normally output nothing.)
1444 Do nothing if DECL is not external. */
1447 assemble_external (decl)
1450 if (output_bytecode)
1453 #ifdef ASM_OUTPUT_EXTERNAL
1454 if (TREE_CODE_CLASS (TREE_CODE (decl)) == 'd'
1455 && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
1457 rtx rtl = DECL_RTL (decl);
1459 if (GET_CODE (rtl) == MEM && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
1460 && ! SYMBOL_REF_USED (XEXP (rtl, 0)))
1462 /* Some systems do require some output. */
1463 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
1464 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
1470 /* Similar, for calling a library function FUN. */
1473 assemble_external_libcall (fun)
1476 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
1477 if (!output_bytecode)
1479 /* Declare library function name external when first used, if nec. */
1480 if (! SYMBOL_REF_USED (fun))
1482 SYMBOL_REF_USED (fun) = 1;
1483 ASM_OUTPUT_EXTERNAL_LIBCALL (asm_out_file, fun);
1489 /* Declare the label NAME global. */
1492 assemble_global (name)
1495 ASM_GLOBALIZE_LABEL (asm_out_file, name);
1498 /* Assemble a label named NAME. */
1501 assemble_label (name)
1504 if (output_bytecode)
1505 BC_OUTPUT_LABEL (asm_out_file, name);
1507 ASM_OUTPUT_LABEL (asm_out_file, name);
1510 /* Output to FILE a reference to the assembler name of a C-level name NAME.
1511 If NAME starts with a *, the rest of NAME is output verbatim.
1512 Otherwise NAME is transformed in an implementation-defined way
1513 (usually by the addition of an underscore).
1514 Many macros in the tm file are defined to call this function. */
1517 assemble_name (file, name)
1523 STRIP_NAME_ENCODING (real_name, name);
1524 TREE_SYMBOL_REFERENCED (get_identifier (real_name)) = 1;
1528 if (output_bytecode)
1529 bc_emit_labelref (name);
1531 fputs (&name[1], file);
1535 if (output_bytecode)
1536 BC_OUTPUT_LABELREF (file, name);
1538 ASM_OUTPUT_LABELREF (file, name);
1542 /* Allocate SIZE bytes writable static space with a gensym name
1543 and return an RTX to refer to its address. */
1546 assemble_static_space (size)
1552 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1553 so that each uninitialized object starts on such a boundary. */
1554 int rounded = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
1555 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
1556 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
1559 if (flag_shared_data)
1563 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
1566 namestring = (char *) obstack_alloc (saveable_obstack,
1568 strcpy (namestring, name);
1570 if (output_bytecode)
1571 x = bc_gen_rtx (namestring, 0, (struct bc_label *) 0);
1573 x = gen_rtx (SYMBOL_REF, Pmode, namestring);
1575 if (output_bytecode)
1577 BC_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1581 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
1582 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
1584 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1590 /* Assemble the static constant template for function entry trampolines.
1591 This is done at most once per compilation.
1592 Returns an RTX for the address of the template. */
1595 assemble_trampoline_template ()
1601 /* Shouldn't get here */
1602 if (output_bytecode)
1605 /* By default, put trampoline templates in read-only data section. */
1607 #ifdef TRAMPOLINE_SECTION
1608 TRAMPOLINE_SECTION ();
1610 readonly_data_section ();
1613 /* Write the assembler code to define one. */
1614 align = floor_log2 (FUNCTION_BOUNDARY / BITS_PER_UNIT);
1616 ASM_OUTPUT_ALIGN (asm_out_file, align);
1618 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LTRAMP", 0);
1619 TRAMPOLINE_TEMPLATE (asm_out_file);
1621 /* Record the rtl to refer to it. */
1622 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
1624 = (char *) obstack_copy0 (&permanent_obstack, label, strlen (label));
1625 return gen_rtx (SYMBOL_REF, Pmode, name);
1628 /* Assemble the integer constant X into an object of SIZE bytes.
1629 X must be either a CONST_INT or CONST_DOUBLE.
1631 Return 1 if we were able to output the constant, otherwise 0. If FORCE is
1632 non-zero, abort if we can't output the constant. */
1635 assemble_integer (x, size, force)
1640 /* First try to use the standard 1, 2, 4, 8, and 16 byte
1641 ASM_OUTPUT... macros. */
1645 #ifdef ASM_OUTPUT_CHAR
1647 ASM_OUTPUT_CHAR (asm_out_file, x);
1651 #ifdef ASM_OUTPUT_SHORT
1653 ASM_OUTPUT_SHORT (asm_out_file, x);
1657 #ifdef ASM_OUTPUT_INT
1659 ASM_OUTPUT_INT (asm_out_file, x);
1663 #ifdef ASM_OUTPUT_DOUBLE_INT
1665 ASM_OUTPUT_DOUBLE_INT (asm_out_file, x);
1669 #ifdef ASM_OUTPUT_QUADRUPLE_INT
1671 ASM_OUTPUT_QUADRUPLE_INT (asm_out_file, x);
1676 /* If we couldn't do it that way, there are two other possibilities: First,
1677 if the machine can output an explicit byte and this is a 1 byte constant,
1678 we can use ASM_OUTPUT_BYTE. */
1680 #ifdef ASM_OUTPUT_BYTE
1681 if (size == 1 && GET_CODE (x) == CONST_INT)
1683 ASM_OUTPUT_BYTE (asm_out_file, INTVAL (x));
1688 /* Finally, if SIZE is larger than a single word, try to output the constant
1689 one word at a time. */
1691 if (size > UNITS_PER_WORD)
1694 enum machine_mode mode
1695 = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0);
1698 for (i = 0; i < size / UNITS_PER_WORD; i++)
1700 word = operand_subword (x, i, 0, mode);
1705 if (! assemble_integer (word, UNITS_PER_WORD, 0))
1709 if (i == size / UNITS_PER_WORD)
1711 /* If we output at least one word and then could not finish,
1712 there is no valid way to continue. */
1723 /* Assemble the floating-point constant D into an object of size MODE. */
1726 assemble_real (d, mode)
1728 enum machine_mode mode;
1730 jmp_buf output_constant_handler;
1732 if (setjmp (output_constant_handler))
1734 error ("floating point trap outputting a constant");
1735 #ifdef REAL_IS_NOT_DOUBLE
1736 bzero ((char *) &d, sizeof d);
1743 set_float_handler (output_constant_handler);
1747 #ifdef ASM_OUTPUT_BYTE_FLOAT
1749 ASM_OUTPUT_BYTE_FLOAT (asm_out_file, d);
1752 #ifdef ASM_OUTPUT_SHORT_FLOAT
1754 ASM_OUTPUT_SHORT_FLOAT (asm_out_file, d);
1757 #ifdef ASM_OUTPUT_THREE_QUARTER_FLOAT
1759 ASM_OUTPUT_THREE_QUARTER_FLOAT (asm_out_file, d);
1762 #ifdef ASM_OUTPUT_FLOAT
1764 ASM_OUTPUT_FLOAT (asm_out_file, d);
1768 #ifdef ASM_OUTPUT_DOUBLE
1770 ASM_OUTPUT_DOUBLE (asm_out_file, d);
1774 #ifdef ASM_OUTPUT_LONG_DOUBLE
1777 ASM_OUTPUT_LONG_DOUBLE (asm_out_file, d);
1785 set_float_handler (NULL_PTR);
1788 /* Here we combine duplicate floating constants to make
1789 CONST_DOUBLE rtx's, and force those out to memory when necessary. */
1791 /* Chain of all CONST_DOUBLE rtx's constructed for the current function.
1792 They are chained through the CONST_DOUBLE_CHAIN.
1793 A CONST_DOUBLE rtx has CONST_DOUBLE_MEM != cc0_rtx iff it is on this chain.
1794 In that case, CONST_DOUBLE_MEM is either a MEM,
1795 or const0_rtx if no MEM has been made for this CONST_DOUBLE yet.
1797 (CONST_DOUBLE_MEM is used only for top-level functions.
1798 See force_const_mem for explanation.) */
1800 static rtx const_double_chain;
1802 /* Return a CONST_DOUBLE or CONST_INT for a value specified as a pair of ints.
1803 For an integer, I0 is the low-order word and I1 is the high-order word.
1804 For a real number, I0 is the word with the low address
1805 and I1 is the word with the high address. */
1808 immed_double_const (i0, i1, mode)
1809 HOST_WIDE_INT i0, i1;
1810 enum machine_mode mode;
1813 int in_current_obstack;
1815 if (GET_MODE_CLASS (mode) == MODE_INT
1816 || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
1818 /* We clear out all bits that don't belong in MODE, unless they and our
1819 sign bit are all one. So we get either a reasonable negative value
1820 or a reasonable unsigned value for this mode. */
1821 int width = GET_MODE_BITSIZE (mode);
1822 if (width < HOST_BITS_PER_WIDE_INT
1823 && ((i0 & ((HOST_WIDE_INT) (-1) << (width - 1)))
1824 != ((HOST_WIDE_INT) (-1) << (width - 1))))
1825 i0 &= ((HOST_WIDE_INT) 1 << width) - 1, i1 = 0;
1826 else if (width == HOST_BITS_PER_WIDE_INT
1827 && ! (i1 == ~0 && i0 < 0))
1829 else if (width > 2 * HOST_BITS_PER_WIDE_INT)
1830 /* We cannot represent this value as a constant. */
1833 /* If this would be an entire word for the target, but is not for
1834 the host, then sign-extend on the host so that the number will look
1835 the same way on the host that it would on the target.
1837 For example, when building a 64 bit alpha hosted 32 bit sparc
1838 targeted compiler, then we want the 32 bit unsigned value -1 to be
1839 represented as a 64 bit value -1, and not as 0x00000000ffffffff.
1840 The later confuses the sparc backend. */
1842 if (BITS_PER_WORD < HOST_BITS_PER_WIDE_INT && BITS_PER_WORD == width
1843 && (i0 & ((HOST_WIDE_INT) 1 << (width - 1))))
1844 i0 |= ((HOST_WIDE_INT) (-1) << width);
1846 /* If MODE fits within HOST_BITS_PER_WIDE_INT, always use a CONST_INT.
1848 ??? Strictly speaking, this is wrong if we create a CONST_INT
1849 for a large unsigned constant with the size of MODE being
1850 HOST_BITS_PER_WIDE_INT and later try to interpret that constant in a
1851 wider mode. In that case we will mis-interpret it as a negative
1854 Unfortunately, the only alternative is to make a CONST_DOUBLE
1855 for any constant in any mode if it is an unsigned constant larger
1856 than the maximum signed integer in an int on the host. However,
1857 doing this will break everyone that always expects to see a CONST_INT
1858 for SImode and smaller.
1860 We have always been making CONST_INTs in this case, so nothing new
1863 if (width <= HOST_BITS_PER_WIDE_INT)
1864 i1 = (i0 < 0) ? ~0 : 0;
1866 /* If this integer fits in one word, return a CONST_INT. */
1867 if ((i1 == 0 && i0 >= 0)
1868 || (i1 == ~0 && i0 < 0))
1869 return GEN_INT (i0);
1871 /* We use VOIDmode for integers. */
1875 /* Search the chain for an existing CONST_DOUBLE with the right value.
1876 If one is found, return it. */
1878 for (r = const_double_chain; r; r = CONST_DOUBLE_CHAIN (r))
1879 if (CONST_DOUBLE_LOW (r) == i0 && CONST_DOUBLE_HIGH (r) == i1
1880 && GET_MODE (r) == mode)
1883 /* No; make a new one and add it to the chain.
1885 We may be called by an optimizer which may be discarding any memory
1886 allocated during its processing (such as combine and loop). However,
1887 we will be leaving this constant on the chain, so we cannot tolerate
1888 freed memory. So switch to saveable_obstack for this allocation
1889 and then switch back if we were in current_obstack. */
1891 push_obstacks_nochange ();
1892 rtl_in_saveable_obstack ();
1893 r = gen_rtx (CONST_DOUBLE, mode, 0, i0, i1);
1896 /* Don't touch const_double_chain in nested function; see force_const_mem.
1897 Also, don't touch it if not inside any function. */
1898 if (outer_function_chain == 0 && current_function_decl != 0)
1900 CONST_DOUBLE_CHAIN (r) = const_double_chain;
1901 const_double_chain = r;
1904 /* Store const0_rtx in mem-slot since this CONST_DOUBLE is on the chain.
1905 Actual use of mem-slot is only through force_const_mem. */
1907 CONST_DOUBLE_MEM (r) = const0_rtx;
1912 /* Return a CONST_DOUBLE for a specified `double' value
1913 and machine mode. */
1916 immed_real_const_1 (d, mode)
1918 enum machine_mode mode;
1920 union real_extract u;
1922 int in_current_obstack;
1924 /* Get the desired `double' value as a sequence of ints
1925 since that is how they are stored in a CONST_DOUBLE. */
1929 /* Detect special cases. */
1931 /* Avoid REAL_VALUES_EQUAL here in order to distinguish minus zero. */
1932 if (!bcmp ((char *) &dconst0, (char *) &d, sizeof d))
1933 return CONST0_RTX (mode);
1934 /* Check for NaN first, because some ports (specifically the i386) do not
1935 emit correct ieee-fp code by default, and thus will generate a core
1936 dump here if we pass a NaN to REAL_VALUES_EQUAL and if REAL_VALUES_EQUAL
1937 does a floating point comparison. */
1938 else if (! REAL_VALUE_ISNAN (d) && REAL_VALUES_EQUAL (dconst1, d))
1939 return CONST1_RTX (mode);
1941 if (sizeof u == 2 * sizeof (HOST_WIDE_INT))
1942 return immed_double_const (u.i[0], u.i[1], mode);
1944 /* The rest of this function handles the case where
1945 a float value requires more than 2 ints of space.
1946 It will be deleted as dead code on machines that don't need it. */
1948 /* Search the chain for an existing CONST_DOUBLE with the right value.
1949 If one is found, return it. */
1951 for (r = const_double_chain; r; r = CONST_DOUBLE_CHAIN (r))
1952 if (! bcmp ((char *) &CONST_DOUBLE_LOW (r), (char *) &u, sizeof u)
1953 && GET_MODE (r) == mode)
1956 /* No; make a new one and add it to the chain.
1958 We may be called by an optimizer which may be discarding any memory
1959 allocated during its processing (such as combine and loop). However,
1960 we will be leaving this constant on the chain, so we cannot tolerate
1961 freed memory. So switch to saveable_obstack for this allocation
1962 and then switch back if we were in current_obstack. */
1964 push_obstacks_nochange ();
1965 rtl_in_saveable_obstack ();
1966 r = rtx_alloc (CONST_DOUBLE);
1968 bcopy ((char *) &u, (char *) &CONST_DOUBLE_LOW (r), sizeof u);
1971 /* Don't touch const_double_chain in nested function; see force_const_mem.
1972 Also, don't touch it if not inside any function. */
1973 if (outer_function_chain == 0 && current_function_decl != 0)
1975 CONST_DOUBLE_CHAIN (r) = const_double_chain;
1976 const_double_chain = r;
1979 /* Store const0_rtx in CONST_DOUBLE_MEM since this CONST_DOUBLE is on the
1980 chain, but has not been allocated memory. Actual use of CONST_DOUBLE_MEM
1981 is only through force_const_mem. */
1983 CONST_DOUBLE_MEM (r) = const0_rtx;
1988 /* Return a CONST_DOUBLE rtx for a value specified by EXP,
1989 which must be a REAL_CST tree node. */
1992 immed_real_const (exp)
1995 return immed_real_const_1 (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)));
1998 /* At the end of a function, forget the memory-constants
1999 previously made for CONST_DOUBLEs. Mark them as not on real_constant_chain.
2000 Also clear out real_constant_chain and clear out all the chain-pointers. */
2003 clear_const_double_mem ()
2005 register rtx r, next;
2007 /* Don't touch CONST_DOUBLE_MEM for nested functions.
2008 See force_const_mem for explanation. */
2009 if (outer_function_chain != 0)
2012 for (r = const_double_chain; r; r = next)
2014 next = CONST_DOUBLE_CHAIN (r);
2015 CONST_DOUBLE_CHAIN (r) = 0;
2016 CONST_DOUBLE_MEM (r) = cc0_rtx;
2018 const_double_chain = 0;
2021 /* Given an expression EXP with a constant value,
2022 reduce it to the sum of an assembler symbol and an integer.
2023 Store them both in the structure *VALUE.
2024 Abort if EXP does not reduce. */
2029 HOST_WIDE_INT offset;
2033 decode_addr_const (exp, value)
2035 struct addr_const *value;
2037 register tree target = TREE_OPERAND (exp, 0);
2038 register int offset = 0;
2043 if (TREE_CODE (target) == COMPONENT_REF
2044 && (TREE_CODE (DECL_FIELD_BITPOS (TREE_OPERAND (target, 1)))
2047 offset += TREE_INT_CST_LOW (DECL_FIELD_BITPOS (TREE_OPERAND (target, 1))) / BITS_PER_UNIT;
2048 target = TREE_OPERAND (target, 0);
2050 else if (TREE_CODE (target) == ARRAY_REF)
2052 if (TREE_CODE (TREE_OPERAND (target, 1)) != INTEGER_CST
2053 || TREE_CODE (TYPE_SIZE (TREE_TYPE (target))) != INTEGER_CST)
2055 offset += ((TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (target)))
2056 * TREE_INT_CST_LOW (TREE_OPERAND (target, 1)))
2058 target = TREE_OPERAND (target, 0);
2064 switch (TREE_CODE (target))
2068 x = DECL_RTL (target);
2072 if (output_bytecode)
2073 /* FIXME: this may not be correct, check it */
2074 x = bc_gen_rtx (TREE_STRING_POINTER (target), 0, (struct bc_label *) 0);
2076 x = gen_rtx (MEM, FUNCTION_MODE,
2077 gen_rtx (LABEL_REF, VOIDmode,
2078 label_rtx (TREE_OPERAND (exp, 0))));
2085 x = TREE_CST_RTL (target);
2092 if (!output_bytecode)
2094 if (GET_CODE (x) != MEM)
2100 value->offset = offset;
2103 /* Uniquize all constants that appear in memory.
2104 Each constant in memory thus far output is recorded
2105 in `const_hash_table' with a `struct constant_descriptor'
2106 that contains a polish representation of the value of
2109 We cannot store the trees in the hash table
2110 because the trees may be temporary. */
2112 struct constant_descriptor
2114 struct constant_descriptor *next;
2120 #define MAX_HASH_TABLE 1009
2121 static struct constant_descriptor *const_hash_table[MAX_HASH_TABLE];
2123 /* Compute a hash code for a constant expression. */
2130 register int len, hi, i;
2131 register enum tree_code code = TREE_CODE (exp);
2133 if (code == INTEGER_CST)
2135 p = (char *) &TREE_INT_CST_LOW (exp);
2136 len = 2 * sizeof TREE_INT_CST_LOW (exp);
2138 else if (code == REAL_CST)
2140 p = (char *) &TREE_REAL_CST (exp);
2141 len = sizeof TREE_REAL_CST (exp);
2143 else if (code == STRING_CST)
2144 p = TREE_STRING_POINTER (exp), len = TREE_STRING_LENGTH (exp);
2145 else if (code == COMPLEX_CST)
2146 return const_hash (TREE_REALPART (exp)) * 5
2147 + const_hash (TREE_IMAGPART (exp));
2148 else if (code == CONSTRUCTOR && TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
2150 len = int_size_in_bytes (TREE_TYPE (exp));
2151 p = (char*) alloca (len);
2152 get_set_constructor_bytes (exp, (unsigned char *) p, len);
2154 else if (code == CONSTRUCTOR)
2158 /* For record type, include the type in the hashing.
2159 We do not do so for array types
2160 because (1) the sizes of the elements are sufficient
2161 and (2) distinct array types can have the same constructor.
2162 Instead, we include the array size because the constructor could
2164 if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE)
2165 hi = ((HOST_WIDE_INT) TREE_TYPE (exp) & ((1 << HASHBITS) - 1))
2168 hi = ((5 + int_size_in_bytes (TREE_TYPE (exp)))
2169 & ((1 << HASHBITS) - 1)) % MAX_HASH_TABLE;
2171 for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link))
2172 if (TREE_VALUE (link))
2173 hi = (hi * 603 + const_hash (TREE_VALUE (link))) % MAX_HASH_TABLE;
2177 else if (code == ADDR_EXPR)
2179 struct addr_const value;
2180 decode_addr_const (exp, &value);
2181 if (GET_CODE (value.base) == SYMBOL_REF)
2183 /* Don't hash the address of the SYMBOL_REF;
2184 only use the offset and the symbol name. */
2186 p = XSTR (value.base, 0);
2187 for (i = 0; p[i] != 0; i++)
2188 hi = ((hi * 613) + (unsigned)(p[i]));
2190 else if (GET_CODE (value.base) == LABEL_REF)
2191 hi = value.offset + CODE_LABEL_NUMBER (XEXP (value.base, 0)) * 13;
2193 hi &= (1 << HASHBITS) - 1;
2194 hi %= MAX_HASH_TABLE;
2197 else if (code == PLUS_EXPR || code == MINUS_EXPR)
2198 return const_hash (TREE_OPERAND (exp, 0)) * 9
2199 + const_hash (TREE_OPERAND (exp, 1));
2200 else if (code == NOP_EXPR || code == CONVERT_EXPR)
2201 return const_hash (TREE_OPERAND (exp, 0)) * 7 + 2;
2203 /* Compute hashing function */
2205 for (i = 0; i < len; i++)
2206 hi = ((hi * 613) + (unsigned)(p[i]));
2208 hi &= (1 << HASHBITS) - 1;
2209 hi %= MAX_HASH_TABLE;
2213 /* Compare a constant expression EXP with a constant-descriptor DESC.
2214 Return 1 if DESC describes a constant with the same value as EXP. */
2217 compare_constant (exp, desc)
2219 struct constant_descriptor *desc;
2221 return 0 != compare_constant_1 (exp, desc->contents);
2224 /* Compare constant expression EXP with a substring P of a constant descriptor.
2225 If they match, return a pointer to the end of the substring matched.
2226 If they do not match, return 0.
2228 Since descriptors are written in polish prefix notation,
2229 this function can be used recursively to test one operand of EXP
2230 against a subdescriptor, and if it succeeds it returns the
2231 address of the subdescriptor for the next operand. */
2234 compare_constant_1 (exp, p)
2238 register char *strp;
2240 register enum tree_code code = TREE_CODE (exp);
2242 if (code != (enum tree_code) *p++)
2245 if (code == INTEGER_CST)
2247 /* Integer constants are the same only if the same width of type. */
2248 if (*p++ != TYPE_PRECISION (TREE_TYPE (exp)))
2250 strp = (char *) &TREE_INT_CST_LOW (exp);
2251 len = 2 * sizeof TREE_INT_CST_LOW (exp);
2253 else if (code == REAL_CST)
2255 /* Real constants are the same only if the same width of type. */
2256 if (*p++ != TYPE_PRECISION (TREE_TYPE (exp)))
2258 strp = (char *) &TREE_REAL_CST (exp);
2259 len = sizeof TREE_REAL_CST (exp);
2261 else if (code == STRING_CST)
2263 if (flag_writable_strings)
2265 strp = TREE_STRING_POINTER (exp);
2266 len = TREE_STRING_LENGTH (exp);
2267 if (bcmp ((char *) &TREE_STRING_LENGTH (exp), p,
2268 sizeof TREE_STRING_LENGTH (exp)))
2270 p += sizeof TREE_STRING_LENGTH (exp);
2272 else if (code == COMPLEX_CST)
2274 p = compare_constant_1 (TREE_REALPART (exp), p);
2275 if (p == 0) return 0;
2276 p = compare_constant_1 (TREE_IMAGPART (exp), p);
2279 else if (code == CONSTRUCTOR && TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
2281 len = int_size_in_bytes (TREE_TYPE (exp));
2282 strp = (char*) alloca (len);
2283 get_set_constructor_bytes (exp, (unsigned char *) strp, len);
2285 else if (code == CONSTRUCTOR)
2288 int length = list_length (CONSTRUCTOR_ELTS (exp));
2291 if (bcmp ((char *) &length, p, sizeof length))
2295 /* For record constructors, insist that the types match.
2296 For arrays, just verify both constructors are for arrays. */
2297 if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE)
2298 type = TREE_TYPE (exp);
2301 if (bcmp ((char *) &type, p, sizeof type))
2305 /* For arrays, insist that the size in bytes match. */
2306 if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
2308 int size = int_size_in_bytes (TREE_TYPE (exp));
2309 if (bcmp ((char *) &size, p, sizeof size))
2314 for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link))
2316 if (TREE_VALUE (link))
2318 if ((p = compare_constant_1 (TREE_VALUE (link), p)) == 0)
2325 if (bcmp ((char *) &zero, p, sizeof zero))
2333 else if (code == ADDR_EXPR)
2335 struct addr_const value;
2336 decode_addr_const (exp, &value);
2337 strp = (char *) &value.offset;
2338 len = sizeof value.offset;
2339 /* Compare the offset. */
2341 if (*p++ != *strp++)
2343 /* Compare symbol name. */
2344 strp = XSTR (value.base, 0);
2345 len = strlen (strp) + 1;
2347 else if (code == PLUS_EXPR || code == MINUS_EXPR)
2349 p = compare_constant_1 (TREE_OPERAND (exp, 0), p);
2350 if (p == 0) return 0;
2351 p = compare_constant_1 (TREE_OPERAND (exp, 1), p);
2354 else if (code == NOP_EXPR || code == CONVERT_EXPR)
2356 p = compare_constant_1 (TREE_OPERAND (exp, 0), p);
2360 /* Compare constant contents. */
2362 if (*p++ != *strp++)
2368 /* Construct a constant descriptor for the expression EXP.
2369 It is up to the caller to enter the descriptor in the hash table. */
2371 static struct constant_descriptor *
2372 record_constant (exp)
2375 struct constant_descriptor *next = 0;
2378 /* Make a struct constant_descriptor. The first two pointers will
2379 be filled in later. Here we just leave space for them. */
2381 obstack_grow (&permanent_obstack, (char *) &next, sizeof next);
2382 obstack_grow (&permanent_obstack, (char *) &label, sizeof label);
2383 record_constant_1 (exp);
2384 return (struct constant_descriptor *) obstack_finish (&permanent_obstack);
2387 /* Add a description of constant expression EXP
2388 to the object growing in `permanent_obstack'.
2389 No need to return its address; the caller will get that
2390 from the obstack when the object is complete. */
2393 record_constant_1 (exp)
2396 register char *strp;
2398 register enum tree_code code = TREE_CODE (exp);
2400 obstack_1grow (&permanent_obstack, (unsigned int) code);
2405 obstack_1grow (&permanent_obstack, TYPE_PRECISION (TREE_TYPE (exp)));
2406 strp = (char *) &TREE_INT_CST_LOW (exp);
2407 len = 2 * sizeof TREE_INT_CST_LOW (exp);
2411 obstack_1grow (&permanent_obstack, TYPE_PRECISION (TREE_TYPE (exp)));
2412 strp = (char *) &TREE_REAL_CST (exp);
2413 len = sizeof TREE_REAL_CST (exp);
2417 if (flag_writable_strings)
2420 strp = TREE_STRING_POINTER (exp);
2421 len = TREE_STRING_LENGTH (exp);
2422 obstack_grow (&permanent_obstack, (char *) &TREE_STRING_LENGTH (exp),
2423 sizeof TREE_STRING_LENGTH (exp));
2427 record_constant_1 (TREE_REALPART (exp));
2428 record_constant_1 (TREE_IMAGPART (exp));
2432 if (TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
2434 int nbytes = int_size_in_bytes (TREE_TYPE (exp));
2435 obstack_grow (&permanent_obstack, &nbytes, sizeof (nbytes));
2436 obstack_blank (&permanent_obstack, nbytes);
2437 get_set_constructor_bytes
2438 (exp, (unsigned char *) permanent_obstack.next_free, nbytes);
2444 int length = list_length (CONSTRUCTOR_ELTS (exp));
2447 obstack_grow (&permanent_obstack, (char *) &length, sizeof length);
2449 /* For record constructors, insist that the types match.
2450 For arrays, just verify both constructors are for arrays. */
2451 if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE)
2452 type = TREE_TYPE (exp);
2455 obstack_grow (&permanent_obstack, (char *) &type, sizeof type);
2457 /* For arrays, insist that the size in bytes match. */
2458 if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
2460 int size = int_size_in_bytes (TREE_TYPE (exp));
2461 obstack_grow (&permanent_obstack, (char *) &size, sizeof size);
2464 for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link))
2466 if (TREE_VALUE (link))
2467 record_constant_1 (TREE_VALUE (link));
2472 obstack_grow (&permanent_obstack,
2473 (char *) &zero, sizeof zero);
2481 struct addr_const value;
2483 decode_addr_const (exp, &value);
2484 /* Record the offset. */
2485 obstack_grow (&permanent_obstack,
2486 (char *) &value.offset, sizeof value.offset);
2487 /* Record the symbol name. */
2488 obstack_grow (&permanent_obstack, XSTR (value.base, 0),
2489 strlen (XSTR (value.base, 0)) + 1);
2495 record_constant_1 (TREE_OPERAND (exp, 0));
2496 record_constant_1 (TREE_OPERAND (exp, 1));
2501 case NON_LVALUE_EXPR:
2502 record_constant_1 (TREE_OPERAND (exp, 0));
2509 /* Record constant contents. */
2510 obstack_grow (&permanent_obstack, strp, len);
2513 /* Record a list of constant expressions that were passed to
2514 output_constant_def but that could not be output right away. */
2516 struct deferred_constant
2518 struct deferred_constant *next;
2524 static struct deferred_constant *deferred_constants;
2526 /* Nonzero means defer output of addressed subconstants
2527 (i.e., those for which output_constant_def is called.) */
2528 static int defer_addressed_constants_flag;
2530 /* Start deferring output of subconstants. */
2533 defer_addressed_constants ()
2535 defer_addressed_constants_flag++;
2538 /* Stop deferring output of subconstants,
2539 and output now all those that have been deferred. */
2542 output_deferred_addressed_constants ()
2544 struct deferred_constant *p, *next;
2546 defer_addressed_constants_flag--;
2548 if (defer_addressed_constants_flag > 0)
2551 for (p = deferred_constants; p; p = next)
2553 output_constant_def_contents (p->exp, p->reloc, p->labelno);
2558 deferred_constants = 0;
2561 /* Make a copy of the whole tree structure for a constant.
2562 This handles the same types of nodes that compare_constant
2563 and record_constant handle. */
2569 switch (TREE_CODE (exp))
2575 /* For ADDR_EXPR, we do not want to copy the decl
2576 whose address is requested. */
2577 return copy_node (exp);
2580 return build_complex (copy_constant (TREE_REALPART (exp)),
2581 copy_constant (TREE_IMAGPART (exp)));
2585 return build (TREE_CODE (exp), TREE_TYPE (exp),
2586 copy_constant (TREE_OPERAND (exp, 0)),
2587 copy_constant (TREE_OPERAND (exp, 1)));
2591 return build1 (TREE_CODE (exp), TREE_TYPE (exp),
2592 copy_constant (TREE_OPERAND (exp, 0)));
2596 tree copy = copy_node (exp);
2597 tree list = copy_list (CONSTRUCTOR_ELTS (exp));
2600 CONSTRUCTOR_ELTS (copy) = list;
2601 for (tail = list; tail; tail = TREE_CHAIN (tail))
2602 TREE_VALUE (tail) = copy_constant (TREE_VALUE (tail));
2603 if (TREE_CODE (TREE_TYPE (exp)) == SET_TYPE)
2604 for (tail = list; tail; tail = TREE_CHAIN (tail))
2605 TREE_PURPOSE (tail) = copy_constant (TREE_PURPOSE (tail));
2615 /* Return an rtx representing a reference to constant data in memory
2616 for the constant expression EXP.
2618 If assembler code for such a constant has already been output,
2619 return an rtx to refer to it.
2620 Otherwise, output such a constant in memory (or defer it for later)
2621 and generate an rtx for it.
2623 The TREE_CST_RTL of EXP is set up to point to that rtx.
2624 The const_hash_table records which constants already have label strings. */
2627 output_constant_def (exp)
2631 register struct constant_descriptor *desc;
2637 if (TREE_CODE (exp) == INTEGER_CST)
2638 abort (); /* No TREE_CST_RTL slot in these. */
2640 if (TREE_CST_RTL (exp))
2641 return TREE_CST_RTL (exp);
2643 /* Make sure any other constants whose addresses appear in EXP
2644 are assigned label numbers. */
2646 reloc = output_addressed_constants (exp);
2648 /* Compute hash code of EXP. Search the descriptors for that hash code
2649 to see if any of them describes EXP. If yes, the descriptor records
2650 the label number already assigned. */
2652 hash = const_hash (exp) % MAX_HASH_TABLE;
2654 for (desc = const_hash_table[hash]; desc; desc = desc->next)
2655 if (compare_constant (exp, desc))
2657 found = desc->label;
2663 /* No constant equal to EXP is known to have been output.
2664 Make a constant descriptor to enter EXP in the hash table.
2665 Assign the label number and record it in the descriptor for
2666 future calls to this function to find. */
2668 /* Create a string containing the label name, in LABEL. */
2669 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
2671 desc = record_constant (exp);
2672 desc->next = const_hash_table[hash];
2674 = (char *) obstack_copy0 (&permanent_obstack, label, strlen (label));
2675 const_hash_table[hash] = desc;
2679 /* Create a string containing the label name, in LABEL. */
2680 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
2683 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
2685 push_obstacks_nochange ();
2686 if (TREE_PERMANENT (exp))
2687 end_temporary_allocation ();
2689 def = gen_rtx (SYMBOL_REF, Pmode, desc->label);
2692 = gen_rtx (MEM, TYPE_MODE (TREE_TYPE (exp)), def);
2693 RTX_UNCHANGING_P (TREE_CST_RTL (exp)) = 1;
2694 if (AGGREGATE_TYPE_P (TREE_TYPE (exp)))
2695 MEM_IN_STRUCT_P (TREE_CST_RTL (exp)) = 1;
2699 /* Optionally set flags or add text to the name to record information
2700 such as that it is a function name. If the name is changed, the macro
2701 ASM_OUTPUT_LABELREF will have to know how to strip this information. */
2702 #ifdef ENCODE_SECTION_INFO
2703 ENCODE_SECTION_INFO (exp);
2706 /* If this is the first time we've seen this particular constant,
2707 output it (or defer its output for later). */
2710 if (defer_addressed_constants_flag)
2712 struct deferred_constant *p;
2713 p = (struct deferred_constant *) xmalloc (sizeof (struct deferred_constant));
2715 push_obstacks_nochange ();
2716 suspend_momentary ();
2717 p->exp = copy_constant (exp);
2720 p->labelno = const_labelno++;
2721 p->next = deferred_constants;
2722 deferred_constants = p;
2725 output_constant_def_contents (exp, reloc, const_labelno++);
2728 return TREE_CST_RTL (exp);
2731 /* Now output assembler code to define the label for EXP,
2732 and follow it with the data of EXP. */
2735 output_constant_def_contents (exp, reloc, labelno)
2742 if (IN_NAMED_SECTION (exp))
2743 named_section (exp, NULL);
2746 /* First switch to text section, except for writable strings. */
2747 #ifdef SELECT_SECTION
2748 SELECT_SECTION (exp, reloc);
2750 if (((TREE_CODE (exp) == STRING_CST) && flag_writable_strings)
2751 || (flag_pic && reloc))
2754 readonly_data_section ();
2758 /* Align the location counter as required by EXP's data type. */
2759 align = TYPE_ALIGN (TREE_TYPE (exp));
2760 #ifdef CONSTANT_ALIGNMENT
2761 align = CONSTANT_ALIGNMENT (exp, align);
2764 if (align > BITS_PER_UNIT)
2766 if (!output_bytecode)
2768 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
2772 BC_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
2776 /* Output the label itself. */
2777 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LC", labelno);
2779 /* Output the value of EXP. */
2780 output_constant (exp,
2781 (TREE_CODE (exp) == STRING_CST
2782 ? TREE_STRING_LENGTH (exp)
2783 : int_size_in_bytes (TREE_TYPE (exp))));
2787 /* Similar hash facility for making memory-constants
2788 from constant rtl-expressions. It is used on RISC machines
2789 where immediate integer arguments and constant addresses are restricted
2790 so that such constants must be stored in memory.
2792 This pool of constants is reinitialized for each function
2793 so each function gets its own constants-pool that comes right before it.
2795 All structures allocated here are discarded when functions are saved for
2796 inlining, so they do not need to be allocated permanently. */
2798 #define MAX_RTX_HASH_TABLE 61
2799 static struct constant_descriptor **const_rtx_hash_table;
2801 /* Structure to represent sufficient information about a constant so that
2802 it can be output when the constant pool is output, so that function
2803 integration can be done, and to simplify handling on machines that reference
2804 constant pool as base+displacement. */
2806 struct pool_constant
2808 struct constant_descriptor *desc;
2809 struct pool_constant *next;
2810 enum machine_mode mode;
2817 /* Pointers to first and last constant in pool. */
2819 static struct pool_constant *first_pool, *last_pool;
2821 /* Current offset in constant pool (does not include any machine-specific
2824 static int pool_offset;
2826 /* Structure used to maintain hash table mapping symbols used to their
2827 corresponding constants. */
2832 struct pool_constant *pool;
2833 struct pool_sym *next;
2836 static struct pool_sym **const_rtx_sym_hash_table;
2838 /* Hash code for a SYMBOL_REF with CONSTANT_POOL_ADDRESS_P true.
2839 The argument is XSTR (... , 0) */
2841 #define SYMHASH(LABEL) \
2842 ((((HOST_WIDE_INT) (LABEL)) & ((1 << HASHBITS) - 1)) % MAX_RTX_HASH_TABLE)
2844 /* Initialize constant pool hashing for next function. */
2847 init_const_rtx_hash_table ()
2849 const_rtx_hash_table
2850 = ((struct constant_descriptor **)
2851 oballoc (MAX_RTX_HASH_TABLE * sizeof (struct constant_descriptor *)));
2852 const_rtx_sym_hash_table
2853 = ((struct pool_sym **)
2854 oballoc (MAX_RTX_HASH_TABLE * sizeof (struct pool_sym *)));
2855 bzero ((char *) const_rtx_hash_table,
2856 MAX_RTX_HASH_TABLE * sizeof (struct constant_descriptor *));
2857 bzero ((char *) const_rtx_sym_hash_table,
2858 MAX_RTX_HASH_TABLE * sizeof (struct pool_sym *));
2860 first_pool = last_pool = 0;
2864 /* Save and restore status for a nested function. */
2867 save_varasm_status (p)
2870 p->const_rtx_hash_table = const_rtx_hash_table;
2871 p->const_rtx_sym_hash_table = const_rtx_sym_hash_table;
2872 p->first_pool = first_pool;
2873 p->last_pool = last_pool;
2874 p->pool_offset = pool_offset;
2878 restore_varasm_status (p)
2881 const_rtx_hash_table = p->const_rtx_hash_table;
2882 const_rtx_sym_hash_table = p->const_rtx_sym_hash_table;
2883 first_pool = p->first_pool;
2884 last_pool = p->last_pool;
2885 pool_offset = p->pool_offset;
2888 enum kind { RTX_DOUBLE, RTX_INT };
2892 #ifdef ONLY_INT_FIELDS
2893 unsigned int kind : 16;
2894 unsigned int mode : 16;
2896 enum kind kind : 16;
2897 enum machine_mode mode : 16;
2900 union real_extract du;
2901 struct addr_const addr;
2905 /* Express an rtx for a constant integer (perhaps symbolic)
2906 as the sum of a symbol or label plus an explicit integer.
2907 They are stored into VALUE. */
2910 decode_rtx_const (mode, x, value)
2911 enum machine_mode mode;
2913 struct rtx_const *value;
2915 /* Clear the whole structure, including any gaps. */
2918 int *p = (int *) value;
2919 int *end = (int *) (value + 1);
2924 value->kind = RTX_INT; /* Most usual kind. */
2927 switch (GET_CODE (x))
2930 value->kind = RTX_DOUBLE;
2931 if (GET_MODE (x) != VOIDmode)
2932 value->mode = GET_MODE (x);
2933 bcopy ((char *) &CONST_DOUBLE_LOW (x),
2934 (char *) &value->un.du, sizeof value->un.du);
2938 value->un.addr.offset = INTVAL (x);
2944 value->un.addr.base = x;
2949 if (GET_CODE (x) == PLUS)
2951 value->un.addr.base = XEXP (x, 0);
2952 if (GET_CODE (XEXP (x, 1)) != CONST_INT)
2954 value->un.addr.offset = INTVAL (XEXP (x, 1));
2956 else if (GET_CODE (x) == MINUS)
2958 value->un.addr.base = XEXP (x, 0);
2959 if (GET_CODE (XEXP (x, 1)) != CONST_INT)
2961 value->un.addr.offset = - INTVAL (XEXP (x, 1));
2971 if (value->kind == RTX_INT && value->un.addr.base != 0)
2972 switch (GET_CODE (value->un.addr.base))
2976 /* Use the string's address, not the SYMBOL_REF's address,
2977 for the sake of addresses of library routines.
2978 For a LABEL_REF, compare labels. */
2979 value->un.addr.base = XEXP (value->un.addr.base, 0);
2983 /* Given a MINUS expression, simplify it if both sides
2984 include the same symbol. */
2987 simplify_subtraction (x)
2990 struct rtx_const val0, val1;
2992 decode_rtx_const (GET_MODE (x), XEXP (x, 0), &val0);
2993 decode_rtx_const (GET_MODE (x), XEXP (x, 1), &val1);
2995 if (val0.un.addr.base == val1.un.addr.base)
2996 return GEN_INT (val0.un.addr.offset - val1.un.addr.offset);
3000 /* Compute a hash code for a constant RTL expression. */
3003 const_hash_rtx (mode, x)
3004 enum machine_mode mode;
3009 struct rtx_const value;
3010 decode_rtx_const (mode, x, &value);
3012 /* Compute hashing function */
3014 for (i = 0; i < sizeof value / sizeof (int); i++)
3015 hi += ((int *) &value)[i];
3017 hi &= (1 << HASHBITS) - 1;
3018 hi %= MAX_RTX_HASH_TABLE;
3022 /* Compare a constant rtl object X with a constant-descriptor DESC.
3023 Return 1 if DESC describes a constant with the same value as X. */
3026 compare_constant_rtx (mode, x, desc)
3027 enum machine_mode mode;
3029 struct constant_descriptor *desc;
3031 register int *p = (int *) desc->contents;
3034 struct rtx_const value;
3036 decode_rtx_const (mode, x, &value);
3037 strp = (int *) &value;
3038 len = sizeof value / sizeof (int);
3040 /* Compare constant contents. */
3042 if (*p++ != *strp++)
3048 /* Construct a constant descriptor for the rtl-expression X.
3049 It is up to the caller to enter the descriptor in the hash table. */
3051 static struct constant_descriptor *
3052 record_constant_rtx (mode, x)
3053 enum machine_mode mode;
3056 struct constant_descriptor *ptr;
3058 struct rtx_const value;
3060 decode_rtx_const (mode, x, &value);
3062 /* Put these things in the saveable obstack so we can ensure it won't
3063 be freed if we are called from combine or some other phase that discards
3064 memory allocated from function_obstack (current_obstack). */
3065 obstack_grow (saveable_obstack, &ptr, sizeof ptr);
3066 obstack_grow (saveable_obstack, &label, sizeof label);
3068 /* Record constant contents. */
3069 obstack_grow (saveable_obstack, &value, sizeof value);
3071 return (struct constant_descriptor *) obstack_finish (saveable_obstack);
3074 /* Given a constant rtx X, make (or find) a memory constant for its value
3075 and return a MEM rtx to refer to it in memory. */
3078 force_const_mem (mode, x)
3079 enum machine_mode mode;
3083 register struct constant_descriptor *desc;
3088 /* If we want this CONST_DOUBLE in the same mode as it is in memory
3089 (this will always be true for floating CONST_DOUBLEs that have been
3090 placed in memory, but not for VOIDmode (integer) CONST_DOUBLEs),
3091 use the previous copy. Otherwise, make a new one. Note that in
3092 the unlikely event that this same CONST_DOUBLE is used in two different
3093 modes in an alternating fashion, we will allocate a lot of different
3094 memory locations, but this should be extremely rare. */
3096 /* Don't use CONST_DOUBLE_MEM in a nested function.
3097 Nested functions have their own constant pools,
3098 so they can't share the same values in CONST_DOUBLE_MEM
3099 with the containing function. */
3100 if (outer_function_chain == 0)
3101 if (GET_CODE (x) == CONST_DOUBLE
3102 && GET_CODE (CONST_DOUBLE_MEM (x)) == MEM
3103 && GET_MODE (CONST_DOUBLE_MEM (x)) == mode)
3104 return CONST_DOUBLE_MEM (x);
3106 /* Compute hash code of X. Search the descriptors for that hash code
3107 to see if any of them describes X. If yes, the descriptor records
3108 the label number already assigned. */
3110 hash = const_hash_rtx (mode, x);
3112 for (desc = const_rtx_hash_table[hash]; desc; desc = desc->next)
3113 if (compare_constant_rtx (mode, x, desc))
3115 found = desc->label;
3121 register struct pool_constant *pool;
3122 register struct pool_sym *sym;
3125 /* No constant equal to X is known to have been output.
3126 Make a constant descriptor to enter X in the hash table.
3127 Assign the label number and record it in the descriptor for
3128 future calls to this function to find. */
3130 desc = record_constant_rtx (mode, x);
3131 desc->next = const_rtx_hash_table[hash];
3132 const_rtx_hash_table[hash] = desc;
3134 /* Align the location counter as required by EXP's data type. */
3135 align = (mode == VOIDmode) ? UNITS_PER_WORD : GET_MODE_SIZE (mode);
3136 if (align > BIGGEST_ALIGNMENT / BITS_PER_UNIT)
3137 align = BIGGEST_ALIGNMENT / BITS_PER_UNIT;
3139 pool_offset += align - 1;
3140 pool_offset &= ~ (align - 1);
3142 /* If RTL is not being placed into the saveable obstack, make a
3143 copy of X that is in the saveable obstack in case we are being
3144 called from combine or some other phase that discards memory
3145 it allocates. We need only do this if it is a CONST, since
3146 no other RTX should be allocated in this situation. */
3147 if (rtl_obstack != saveable_obstack
3148 && GET_CODE (x) == CONST)
3150 push_obstacks_nochange ();
3151 rtl_in_saveable_obstack ();
3153 x = gen_rtx (CONST, GET_MODE (x),
3154 gen_rtx (PLUS, GET_MODE (x),
3155 XEXP (XEXP (x, 0), 0), XEXP (XEXP (x, 0), 1)));
3159 /* Allocate a pool constant descriptor, fill it in, and chain it in. */
3161 pool = (struct pool_constant *) savealloc (sizeof (struct pool_constant));
3165 pool->labelno = const_labelno;
3166 pool->align = align;
3167 pool->offset = pool_offset;
3173 last_pool->next = pool;
3176 pool_offset += GET_MODE_SIZE (mode);
3178 /* Create a string containing the label name, in LABEL. */
3179 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3184 = (char *) obstack_copy0 (saveable_obstack, label, strlen (label));
3186 /* Add label to symbol hash table. */
3187 hash = SYMHASH (found);
3188 sym = (struct pool_sym *) savealloc (sizeof (struct pool_sym));
3191 sym->next = const_rtx_sym_hash_table[hash];
3192 const_rtx_sym_hash_table[hash] = sym;
3195 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3197 def = gen_rtx (MEM, mode, gen_rtx (SYMBOL_REF, Pmode, found));
3199 RTX_UNCHANGING_P (def) = 1;
3200 /* Mark the symbol_ref as belonging to this constants pool. */
3201 CONSTANT_POOL_ADDRESS_P (XEXP (def, 0)) = 1;
3202 current_function_uses_const_pool = 1;
3204 if (outer_function_chain == 0)
3205 if (GET_CODE (x) == CONST_DOUBLE)
3207 if (CONST_DOUBLE_MEM (x) == cc0_rtx)
3209 CONST_DOUBLE_CHAIN (x) = const_double_chain;
3210 const_double_chain = x;
3212 CONST_DOUBLE_MEM (x) = def;
3218 /* Given a SYMBOL_REF with CONSTANT_POOL_ADDRESS_P true, return a pointer to
3219 the corresponding pool_constant structure. */
3221 static struct pool_constant *
3222 find_pool_constant (addr)
3225 struct pool_sym *sym;
3226 char *label = XSTR (addr, 0);
3228 for (sym = const_rtx_sym_hash_table[SYMHASH (label)]; sym; sym = sym->next)
3229 if (sym->label == label)
3235 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3238 get_pool_constant (addr)
3241 return (find_pool_constant (addr))->constant;
3244 /* Similar, return the mode. */
3247 get_pool_mode (addr)
3250 return (find_pool_constant (addr))->mode;
3253 /* Similar, return the offset in the constant pool. */
3256 get_pool_offset (addr)
3259 return (find_pool_constant (addr))->offset;
3262 /* Return the size of the constant pool. */
3270 /* Write all the constants in the constant pool. */
3273 output_constant_pool (fnname, fndecl)
3277 struct pool_constant *pool;
3279 union real_extract u;
3281 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3282 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool_offset);
3285 for (pool = first_pool; pool; pool = pool->next)
3289 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3290 whose CODE_LABEL has been deleted. This can occur if a jump table
3291 is eliminated by optimization. If so, write a constant of zero
3292 instead. Note that this can also happen by turning the
3293 CODE_LABEL into a NOTE. */
3294 if (((GET_CODE (x) == LABEL_REF
3295 && (INSN_DELETED_P (XEXP (x, 0))
3296 || GET_CODE (XEXP (x, 0)) == NOTE)))
3297 || (GET_CODE (x) == CONST && GET_CODE (XEXP (x, 0)) == PLUS
3298 && GET_CODE (XEXP (XEXP (x, 0), 0)) == LABEL_REF
3299 && (INSN_DELETED_P (XEXP (XEXP (XEXP (x, 0), 0), 0))
3300 || GET_CODE (XEXP (XEXP (XEXP (x, 0), 0), 0)) == NOTE)))
3303 /* First switch to correct section. */
3304 #ifdef SELECT_RTX_SECTION
3305 SELECT_RTX_SECTION (pool->mode, x);
3307 readonly_data_section ();
3310 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3311 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, pool->mode,
3312 pool->align, pool->labelno, done);
3315 if (pool->align > 1)
3316 ASM_OUTPUT_ALIGN (asm_out_file, exact_log2 (pool->align));
3318 /* Output the label. */
3319 ASM_OUTPUT_INTERNAL_LABEL (asm_out_file, "LC", pool->labelno);
3321 /* Output the value of the constant itself. */
3322 switch (GET_MODE_CLASS (pool->mode))
3325 if (GET_CODE (x) != CONST_DOUBLE)
3328 bcopy ((char *) &CONST_DOUBLE_LOW (x), (char *) &u, sizeof u);
3329 assemble_real (u.d, pool->mode);
3333 case MODE_PARTIAL_INT:
3334 assemble_integer (x, GET_MODE_SIZE (pool->mode), 1);
3344 /* Done with this pool. */
3345 first_pool = last_pool = 0;
3348 /* Find all the constants whose addresses are referenced inside of EXP,
3349 and make sure assembler code with a label has been output for each one.
3350 Indicate whether an ADDR_EXPR has been encountered. */
3353 output_addressed_constants (exp)
3358 switch (TREE_CODE (exp))
3362 register tree constant = TREE_OPERAND (exp, 0);
3364 while (TREE_CODE (constant) == COMPONENT_REF)
3366 constant = TREE_OPERAND (constant, 0);
3369 if (TREE_CODE_CLASS (TREE_CODE (constant)) == 'c'
3370 || TREE_CODE (constant) == CONSTRUCTOR)
3371 /* No need to do anything here
3372 for addresses of variables or functions. */
3373 output_constant_def (constant);
3380 reloc = output_addressed_constants (TREE_OPERAND (exp, 0));
3381 reloc |= output_addressed_constants (TREE_OPERAND (exp, 1));
3386 case NON_LVALUE_EXPR:
3387 reloc = output_addressed_constants (TREE_OPERAND (exp, 0));
3393 for (link = CONSTRUCTOR_ELTS (exp); link; link = TREE_CHAIN (link))
3394 if (TREE_VALUE (link) != 0)
3395 reloc |= output_addressed_constants (TREE_VALUE (link));
3405 /* Output assembler code for constant EXP to FILE, with no label.
3406 This includes the pseudo-op such as ".int" or ".byte", and a newline.
3407 Assumes output_addressed_constants has been done on EXP already.
3409 Generate exactly SIZE bytes of assembler data, padding at the end
3410 with zeros if necessary. SIZE must always be specified.
3412 SIZE is important for structure constructors,
3413 since trailing members may have been omitted from the constructor.
3414 It is also important for initialization of arrays from string constants
3415 since the full length of the string constant might not be wanted.
3416 It is also needed for initialization of unions, where the initializer's
3417 type is just one member, and that may not be as long as the union.
3419 There a case in which we would fail to output exactly SIZE bytes:
3420 for a structure constructor that wants to produce more than SIZE bytes.
3421 But such constructors will never be generated for any possible input. */
3424 output_constant (exp, size)
3428 register enum tree_code code = TREE_CODE (TREE_TYPE (exp));
3434 /* Eliminate the NON_LVALUE_EXPR_EXPR that makes a cast not be an lvalue.
3435 That way we get the constant (we hope) inside it. Also, strip off any
3436 NOP_EXPR that converts between two record, union, array, or set types. */
3437 while ((TREE_CODE (exp) == NOP_EXPR
3438 && (TREE_TYPE (exp) == TREE_TYPE (TREE_OPERAND (exp, 0))
3439 || AGGREGATE_TYPE_P (TREE_TYPE (exp))))
3440 || TREE_CODE (exp) == NON_LVALUE_EXPR)
3441 exp = TREE_OPERAND (exp, 0);
3443 /* Allow a constructor with no elements for any data type.
3444 This means to fill the space with zeros. */
3445 if (TREE_CODE (exp) == CONSTRUCTOR && CONSTRUCTOR_ELTS (exp) == 0)
3447 if (output_bytecode)
3448 bc_emit_const_skip (size);
3450 assemble_zeros (size);
3461 case REFERENCE_TYPE:
3462 /* ??? What about (int)((float)(int)&foo + 4) */
3463 while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
3464 || TREE_CODE (exp) == NON_LVALUE_EXPR)
3465 exp = TREE_OPERAND (exp, 0);
3467 if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
3468 EXPAND_INITIALIZER),
3470 error ("initializer for integer value is too complicated");
3475 if (TREE_CODE (exp) != REAL_CST)
3476 error ("initializer for floating value is not a floating constant");
3478 assemble_real (TREE_REAL_CST (exp),
3479 mode_for_size (size * BITS_PER_UNIT, MODE_FLOAT, 0));
3484 output_constant (TREE_REALPART (exp), size / 2);
3485 output_constant (TREE_IMAGPART (exp), size / 2);
3486 size -= (size / 2) * 2;
3490 if (TREE_CODE (exp) == CONSTRUCTOR)
3492 output_constructor (exp, size);
3495 else if (TREE_CODE (exp) == STRING_CST)
3499 if (size > TREE_STRING_LENGTH (exp))
3501 excess = size - TREE_STRING_LENGTH (exp);
3502 size = TREE_STRING_LENGTH (exp);
3505 assemble_string (TREE_STRING_POINTER (exp), size);
3514 if (TREE_CODE (exp) == CONSTRUCTOR)
3515 output_constructor (exp, size);
3521 if (TREE_CODE (exp) == INTEGER_CST)
3522 assemble_integer (expand_expr (exp, NULL_RTX,
3523 VOIDmode, EXPAND_INITIALIZER),
3525 else if (TREE_CODE (exp) == CONSTRUCTOR)
3527 unsigned char *buffer = (unsigned char *) alloca (size);
3528 if (get_set_constructor_bytes (exp, buffer, size))
3530 assemble_string (buffer, size);
3533 error ("unknown set constructor type");
3538 assemble_zeros (size);
3541 /* Bytecode specific code to output assembler for integer. */
3544 bc_assemble_integer (exp, size)
3552 /* FIXME: is this fold() business going to be as good as the
3553 expand_expr() using EXPAND_SUM above in the RTL case? I
3555 FIXME: Copied as is from BC-GCC1; may need work. Don't hate. -bson */
3559 while (TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR)
3560 exp = TREE_OPERAND (exp, 0);
3561 if (TREE_CODE (exp) == INTEGER_CST)
3566 else if (TREE_CODE (exp) == PLUS_EXPR)
3568 const_part = TREE_OPERAND (exp, 0);
3569 while (TREE_CODE (const_part) == NOP_EXPR
3570 || TREE_CODE (const_part) == CONVERT_EXPR)
3571 const_part = TREE_OPERAND (const_part, 0);
3572 addr_part = TREE_OPERAND (exp, 1);
3573 while (TREE_CODE (addr_part) == NOP_EXPR
3574 || TREE_CODE (addr_part) == CONVERT_EXPR)
3575 addr_part = TREE_OPERAND (addr_part, 0);
3576 if (TREE_CODE (const_part) != INTEGER_CST)
3577 tmp = const_part, const_part = addr_part, addr_part = tmp;
3578 if (TREE_CODE (const_part) != INTEGER_CST
3579 || TREE_CODE (addr_part) != ADDR_EXPR)
3580 abort (); /* FIXME: we really haven't considered
3581 all the possible cases here. */
3583 else if (TREE_CODE (exp) == ADDR_EXPR)
3585 const_part = integer_zero_node;
3589 abort (); /* FIXME: ditto previous. */
3595 char c = TREE_INT_CST_LOW (const_part);
3601 short s = TREE_INT_CST_LOW (const_part);
3602 bc_emit ((char *) &s, 2);
3607 int i = TREE_INT_CST_LOW (const_part);
3608 bc_emit ((char *) &i, 4);
3613 if (WORDS_BIG_ENDIAN)
3615 int i = TREE_INT_CST_HIGH (const_part);
3616 bc_emit ((char *) &i, 4);
3617 i = TREE_INT_CST_LOW (const_part);
3618 bc_emit ((char *) &i, 4);
3622 int i = TREE_INT_CST_LOW (const_part);
3623 bc_emit ((char *) &i, 4);
3624 i = TREE_INT_CST_HIGH (const_part);
3625 bc_emit ((char *) &i, 4);
3632 && TREE_CODE (TREE_OPERAND (addr_part, 0)) == VAR_DECL)
3633 bc_emit_labelref (DECL_ASSEMBLER_NAME (TREE_OPERAND (addr_part, 0)),
3634 TREE_INT_CST_LOW (const_part));
3636 abort (); /* FIXME: there may be more cases. */
3639 /* Subroutine of output_constant, used for CONSTRUCTORs
3640 (aggregate constants).
3641 Generate at least SIZE bytes, padding if necessary. */
3644 output_constructor (exp, size)
3648 register tree link, field = 0;
3649 HOST_WIDE_INT min_index = 0;
3650 /* Number of bytes output or skipped so far.
3651 In other words, current position within the constructor. */
3652 int total_bytes = 0;
3653 /* Non-zero means BYTE contains part of a byte, to be output. */
3654 int byte_buffer_in_use = 0;
3657 if (HOST_BITS_PER_WIDE_INT < BITS_PER_UNIT)
3660 if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE)
3661 field = TYPE_FIELDS (TREE_TYPE (exp));
3663 if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
3664 && TYPE_DOMAIN (TREE_TYPE (exp)) != 0)
3666 = TREE_INT_CST_LOW (TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (exp))));
3668 /* As LINK goes through the elements of the constant,
3669 FIELD goes through the structure fields, if the constant is a structure.
3670 if the constant is a union, then we override this,
3671 by getting the field from the TREE_LIST element.
3672 But the constant could also be an array. Then FIELD is zero. */
3673 for (link = CONSTRUCTOR_ELTS (exp);
3675 link = TREE_CHAIN (link),
3676 field = field ? TREE_CHAIN (field) : 0)
3678 tree val = TREE_VALUE (link);
3681 /* the element in a union constructor specifies the proper field. */
3683 if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
3684 || TREE_CODE (TREE_TYPE (exp)) == UNION_TYPE)
3686 /* if available, use the type given by link */
3687 if (TREE_PURPOSE (link) != 0)
3688 field = TREE_PURPOSE (link);
3691 if (TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE)
3692 index = TREE_PURPOSE (link);
3694 /* Eliminate the marker that makes a cast not be an lvalue. */
3698 if (field == 0 || !DECL_BIT_FIELD (field))
3700 /* An element that is not a bit-field. */
3702 register int fieldsize;
3703 /* Since this structure is static,
3704 we know the positions are constant. */
3705 int bitpos = (field ? (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (field))
3709 bitpos = (TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (val)))
3711 * (TREE_INT_CST_LOW (index) - min_index));
3713 /* Output any buffered-up bit-fields preceding this element. */
3714 if (byte_buffer_in_use)
3716 ASM_OUTPUT_BYTE (asm_out_file, byte);
3718 byte_buffer_in_use = 0;
3721 /* Advance to offset of this element.
3722 Note no alignment needed in an array, since that is guaranteed
3723 if each element has the proper size. */
3724 if ((field != 0 || index != 0) && bitpos != total_bytes)
3726 if (!output_bytecode)
3727 assemble_zeros (bitpos - total_bytes);
3729 bc_emit_const_skip (bitpos - total_bytes);
3730 total_bytes = bitpos;
3733 /* Determine size this element should occupy. */
3736 if (TREE_CODE (DECL_SIZE (field)) != INTEGER_CST)
3738 if (TREE_INT_CST_LOW (DECL_SIZE (field)) > 100000)
3740 /* This avoids overflow trouble. */
3741 tree size_tree = size_binop (CEIL_DIV_EXPR,
3743 size_int (BITS_PER_UNIT));
3744 fieldsize = TREE_INT_CST_LOW (size_tree);
3748 fieldsize = TREE_INT_CST_LOW (DECL_SIZE (field));
3749 fieldsize = (fieldsize + BITS_PER_UNIT - 1) / BITS_PER_UNIT;
3753 fieldsize = int_size_in_bytes (TREE_TYPE (TREE_TYPE (exp)));
3755 /* Output the element's initial value. */
3757 assemble_zeros (fieldsize);
3759 output_constant (val, fieldsize);
3761 /* Count its size. */
3762 total_bytes += fieldsize;
3764 else if (val != 0 && TREE_CODE (val) != INTEGER_CST)
3765 error ("invalid initial value for member `%s'",
3766 IDENTIFIER_POINTER (DECL_NAME (field)));
3769 /* Element that is a bit-field. */
3771 int next_offset = TREE_INT_CST_LOW (DECL_FIELD_BITPOS (field));
3773 = (next_offset + TREE_INT_CST_LOW (DECL_SIZE (field)));
3776 val = integer_zero_node;
3778 /* If this field does not start in this (or, next) byte,
3780 if (next_offset / BITS_PER_UNIT != total_bytes)
3782 /* Output remnant of any bit field in previous bytes. */
3783 if (byte_buffer_in_use)
3785 ASM_OUTPUT_BYTE (asm_out_file, byte);
3787 byte_buffer_in_use = 0;
3790 /* If still not at proper byte, advance to there. */
3791 if (next_offset / BITS_PER_UNIT != total_bytes)
3793 assemble_zeros (next_offset / BITS_PER_UNIT - total_bytes);
3794 total_bytes = next_offset / BITS_PER_UNIT;
3798 if (! byte_buffer_in_use)
3801 /* We must split the element into pieces that fall within
3802 separate bytes, and combine each byte with previous or
3803 following bit-fields. */
3805 /* next_offset is the offset n fbits from the beginning of
3806 the structure to the next bit of this element to be processed.
3807 end_offset is the offset of the first bit past the end of
3809 while (next_offset < end_offset)
3813 HOST_WIDE_INT value;
3814 int next_byte = next_offset / BITS_PER_UNIT;
3815 int next_bit = next_offset % BITS_PER_UNIT;
3817 /* Advance from byte to byte
3818 within this element when necessary. */
3819 while (next_byte != total_bytes)
3821 ASM_OUTPUT_BYTE (asm_out_file, byte);
3826 /* Number of bits we can process at once
3827 (all part of the same byte). */
3828 this_time = MIN (end_offset - next_offset,
3829 BITS_PER_UNIT - next_bit);
3830 if (BYTES_BIG_ENDIAN)
3832 /* On big-endian machine, take the most significant bits
3833 first (of the bits that are significant)
3834 and put them into bytes from the most significant end. */
3835 shift = end_offset - next_offset - this_time;
3836 /* Don't try to take a bunch of bits that cross
3837 the word boundary in the INTEGER_CST. */
3838 if (shift < HOST_BITS_PER_WIDE_INT
3839 && shift + this_time > HOST_BITS_PER_WIDE_INT)
3841 this_time -= (HOST_BITS_PER_WIDE_INT - shift);
3842 shift = HOST_BITS_PER_WIDE_INT;
3845 /* Now get the bits from the appropriate constant word. */
3846 if (shift < HOST_BITS_PER_WIDE_INT)
3848 value = TREE_INT_CST_LOW (val);
3850 else if (shift < 2 * HOST_BITS_PER_WIDE_INT)
3852 value = TREE_INT_CST_HIGH (val);
3853 shift -= HOST_BITS_PER_WIDE_INT;
3857 byte |= (((value >> shift)
3858 & (((HOST_WIDE_INT) 1 << this_time) - 1))
3859 << (BITS_PER_UNIT - this_time - next_bit));
3863 /* On little-endian machines,
3864 take first the least significant bits of the value
3865 and pack them starting at the least significant
3866 bits of the bytes. */
3867 shift = (next_offset
3868 - TREE_INT_CST_LOW (DECL_FIELD_BITPOS (field)));
3869 /* Don't try to take a bunch of bits that cross
3870 the word boundary in the INTEGER_CST. */
3871 if (shift < HOST_BITS_PER_WIDE_INT
3872 && shift + this_time > HOST_BITS_PER_WIDE_INT)
3874 this_time -= (HOST_BITS_PER_WIDE_INT - shift);
3875 shift = HOST_BITS_PER_WIDE_INT;
3878 /* Now get the bits from the appropriate constant word. */
3879 if (shift < HOST_BITS_PER_INT)
3880 value = TREE_INT_CST_LOW (val);
3881 else if (shift < 2 * HOST_BITS_PER_WIDE_INT)
3883 value = TREE_INT_CST_HIGH (val);
3884 shift -= HOST_BITS_PER_WIDE_INT;
3888 byte |= (((value >> shift)
3889 & (((HOST_WIDE_INT) 1 << this_time) - 1))
3892 next_offset += this_time;
3893 byte_buffer_in_use = 1;
3897 if (byte_buffer_in_use)
3899 ASM_OUTPUT_BYTE (asm_out_file, byte);
3902 if (total_bytes < size)
3903 assemble_zeros (size - total_bytes);
3907 #ifdef HANDLE_SYSV_PRAGMA
3909 /* Support #pragma weak by default if WEAK_ASM_OP and ASM_OUTPUT_DEF
3911 #if defined (WEAK_ASM_OP) && defined (ASM_OUTPUT_DEF)
3913 /* See c-pragma.c for an identical definition. */
3929 /* Output asm to handle ``#pragma weak'' */
3931 handle_pragma_weak (what, asm_out_file, name, value)
3932 enum pragma_state what;
3936 if (what == ps_name || what == ps_value)
3938 fprintf (asm_out_file, "\t%s\t", WEAK_ASM_OP);
3940 if (output_bytecode)
3941 BC_OUTPUT_LABELREF (asm_out_file, name);
3943 ASM_OUTPUT_LABELREF (asm_out_file, name);
3945 fputc ('\n', asm_out_file);
3946 if (what == ps_value)
3947 ASM_OUTPUT_DEF (asm_out_file, name, value);
3949 else if (! (what == ps_done || what == ps_start))
3950 warning ("malformed `#pragma weak'");
3953 #endif /* HANDLE_PRAGMA_WEAK or (WEAK_ASM_OP and SET_ASM_OP) */
3955 #endif /* WEAK_ASM_OP && ASM_OUTPUT_DEF */