1 /* Declarations for insn-output.c. These functions are defined in recog.c,
3 Copyright (C) 1987, 1991, 1994, 1997, 1998,
4 1999, 2000, 2001 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 /* Compute branch alignments based on frequency information in the CFG. */
24 extern void compute_alignments
PARAMS ((void));
26 /* Initialize data in final at the beginning of a compilation. */
27 extern void init_final
PARAMS ((const char *));
29 /* Called at end of source file,
30 to output the block-profiling table for this entire compilation. */
31 extern void end_final
PARAMS ((const char *));
33 /* Enable APP processing of subsequent output.
34 Used before the output from an `asm' statement. */
35 extern void app_enable
PARAMS ((void));
37 /* Disable APP processing of subsequent output.
38 Called from varasm.c before most kinds of output. */
39 extern void app_disable
PARAMS ((void));
41 /* Return the number of slots filled in the current
42 delayed branch sequence (we don't count the insn needing the
43 delay slot). Zero if not in a delayed branch sequence. */
44 extern int dbr_sequence_length
PARAMS ((void));
46 /* Indicate that branch shortening hasn't yet been done. */
47 extern void init_insn_lengths
PARAMS ((void));
50 /* Obtain the current length of an insn. If branch shortening has been done,
51 get its actual length. Otherwise, get its maximum length. */
52 extern int get_attr_length
PARAMS ((rtx
));
54 /* Make a pass over all insns and compute their actual lengths by shortening
55 any branches of variable length if possible. */
56 extern void shorten_branches
PARAMS ((rtx
));
58 /* Output assembler code for the start of a function,
59 and initialize some of the variables in this file
60 for the new function. The label for the function and associated
61 assembler pseudo-ops have already been output in
62 `assemble_start_function'. */
63 extern void final_start_function
PARAMS ((rtx
, FILE *, int));
65 /* Output assembler code for the end of a function.
66 For clarity, args are same as those of `final_start_function'
67 even though not all of them are needed. */
68 extern void final_end_function
PARAMS ((void));
70 /* Output assembler code for some insns: all or part of a function. */
71 extern void final
PARAMS ((rtx
, FILE *, int, int));
73 /* The final scan for one insn, INSN. Args are same as in `final', except
74 that INSN is the insn being scanned. Value returned is the next insn to
76 extern rtx final_scan_insn
PARAMS ((rtx
, FILE *, int, int, int));
78 /* Replace a SUBREG with a REG or a MEM, based on the thing it is a
80 extern rtx alter_subreg
PARAMS ((rtx
*));
82 /* Report inconsistency between the assembler template and the operands.
83 In an `asm', it's the user's fault; otherwise, the compiler's fault. */
84 extern void output_operand_lossage
PARAMS ((const char *));
86 /* Output a string of assembler code, substituting insn operands.
87 Defined in final.c. */
88 extern void output_asm_insn
PARAMS ((const char *, rtx
*));
90 /* Compute a worst-case reference address of a branch so that it
91 can be safely used in the presence of aligned labels.
92 Defined in final.c. */
93 extern int insn_current_reference_address
PARAMS ((rtx
));
95 /* Find the alignment associated with a CODE_LABEL.
96 Defined in final.c. */
97 extern int label_to_alignment
PARAMS ((rtx
));
99 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */
100 extern void output_asm_label
PARAMS ((rtx
));
102 /* Print a memory reference operand for address X
103 using machine-dependent assembler syntax. */
104 extern void output_address
PARAMS ((rtx
));
106 /* Print an integer constant expression in assembler syntax.
107 Addition and subtraction are the only arithmetic
108 that may appear in these expressions. */
109 extern void output_addr_const
PARAMS ((FILE *, rtx
));
111 /* Output a string of assembler code, substituting numbers, strings
112 and fixed syntactic prefixes. */
113 extern void asm_fprintf
PARAMS ((FILE *file
, const char *p
, ...));
115 /* Split up a CONST_DOUBLE or integer constant rtx into two rtx's for single
117 extern void split_double
PARAMS ((rtx
, rtx
*, rtx
*));
119 /* Return nonzero if this function has no function calls. */
120 extern int leaf_function_p
PARAMS ((void));
122 /* Return 1 if branch is an forward branch.
123 Uses insn_shuid array, so it works only in the final pass. May be used by
124 output templates to add branch prediction hints, for example. */
125 extern int final_forward_branch_p
PARAMS ((rtx
));
127 /* Return 1 if this function uses only the registers that can be
128 safely renumbered. */
129 extern int only_leaf_regs_used
PARAMS ((void));
131 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
132 available in leaf functions. */
133 extern void leaf_renumber_regs_insn
PARAMS ((rtx
));
135 /* Locate the proper template for the given insn-code. */
136 extern const char *get_insn_template
PARAMS ((int, rtx
));
138 /* Add function NAME to the weak symbols list. VALUE is a weak alias
139 associated with NAME. */
140 extern int add_weak
PARAMS ((const char *, const char *));
142 /* Functions in flow.c */
143 extern void allocate_for_life_analysis
PARAMS ((void));
144 extern int regno_uninitialized
PARAMS ((unsigned int));
145 extern int regno_clobbered_at_setjmp
PARAMS ((int));
146 extern void find_basic_blocks
PARAMS ((rtx
, int, FILE *));
147 extern bool cleanup_cfg
PARAMS ((int));
148 extern void check_function_return_warnings
PARAMS ((void));
151 /* Functions in varasm.c. */
153 /* Tell assembler to switch to text section. */
154 extern void text_section
PARAMS ((void));
156 /* Tell assembler to switch to data section. */
157 extern void data_section
PARAMS ((void));
159 /* Tell assembler to make sure its in the data section. */
160 extern void force_data_section
PARAMS ((void));
162 /* Tell assembler to switch to read-only data section. This is normally
164 extern void readonly_data_section
PARAMS ((void));
166 /* Determine if we're in the text section. */
167 extern int in_text_section
PARAMS ((void));
169 #ifdef CTORS_SECTION_ASM_OP
170 extern void ctors_section
PARAMS ((void));
173 #ifdef DTORS_SECTION_ASM_OP
174 extern void dtors_section
PARAMS ((void));
177 #ifdef BSS_SECTION_ASM_OP
178 extern void bss_section
PARAMS ((void));
181 #ifdef CONST_SECTION_ASM_OP
182 extern void const_section
PARAMS ((void));
185 #ifdef INIT_SECTION_ASM_OP
186 extern void init_section
PARAMS ((void));
189 #ifdef FINI_SECTION_ASM_OP
190 extern void fini_section
PARAMS ((void));
193 #ifdef EXPORTS_SECTION_ASM_OP
194 extern void exports_section
PARAMS ((void));
197 #ifdef TDESC_SECTION_ASM_OP
198 extern void tdesc_section
PARAMS ((void));
201 #ifdef DRECTVE_SECTION_ASM_OP
202 extern void drectve_section
PARAMS ((void));
205 #ifdef SDATA_SECTION_ASM_OP
206 extern void sdata_section
PARAMS ((void));
209 #ifdef RDATA_SECTION_ASM_OP
210 extern void rdata_section
PARAMS ((void));
214 /* Tell assembler to change to section NAME for DECL.
215 If DECL is NULL, just switch to section NAME.
216 If NAME is NULL, get the name from DECL.
217 If RELOC is 1, the initializer for DECL contains relocs. */
218 extern void named_section
PARAMS ((tree
, const char *, int));
220 /* Tell assembler to switch to the section for function DECL. */
221 extern void function_section
PARAMS ((tree
));
223 /* Tell assembler to switch to the section for string merging. */
224 extern void mergeable_string_section
PARAMS ((tree
, unsigned HOST_WIDE_INT
,
227 /* Tell assembler to switch to the section for constant merging. */
228 extern void mergeable_constant_section
PARAMS ((enum machine_mode
,
229 unsigned HOST_WIDE_INT
,
232 /* Declare DECL to be a weak symbol. */
233 extern void declare_weak
PARAMS ((tree
));
234 #endif /* TREE_CODE */
236 /* Emit any pending weak declarations. */
237 extern void weak_finish
PARAMS ((void));
239 /* Decode an `asm' spec for a declaration as a register name.
240 Return the register number, or -1 if nothing specified,
241 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
242 or -3 if ASMSPEC is `cc' and is not recognized,
243 or -4 if ASMSPEC is `memory' and is not recognized.
244 Accept an exact spelling or a decimal number.
245 Prefixes such as % are optional. */
246 extern int decode_reg_name
PARAMS ((const char *));
249 /* Make the rtl for variable VAR be volatile.
250 Use this only for static variables. */
251 extern void make_var_volatile
PARAMS ((tree
));
253 /* Output alignment directive to align for constant expression EXP. */
254 extern void assemble_constant_align
PARAMS ((tree
));
256 extern void assemble_alias
PARAMS ((tree
, tree
));
258 /* Output a string of literal assembler code
259 for an `asm' keyword used between functions. */
260 extern void assemble_asm
PARAMS ((tree
));
262 /* Output assembler code for the constant pool of a function and associated
263 with defining the name of the function. DECL describes the function.
264 NAME is the function's name. For the constant pool, we use the current
265 constant pool data. */
266 extern void assemble_start_function
PARAMS ((tree
, const char *));
268 /* Output assembler code associated with defining the size of the
269 function. DECL describes the function. NAME is the function's name. */
270 extern void assemble_end_function
PARAMS ((tree
, const char *));
272 /* Assemble everything that is needed for a variable or function declaration.
273 Not used for automatic variables, and not used for function definitions.
274 Should not be called for variables of incomplete structure type.
276 TOP_LEVEL is nonzero if this variable has file scope.
277 AT_END is nonzero if this is the special handling, at end of compilation,
278 to define things that have had only tentative definitions.
279 DONT_OUTPUT_DATA if nonzero means don't actually output the
280 initial value (that will be done by the caller). */
281 extern void assemble_variable
PARAMS ((tree
, int, int, int));
283 /* Output something to declare an external symbol to the assembler.
284 (Most assemblers don't need this, so we normally output nothing.)
285 Do nothing if DECL is not external. */
286 extern void assemble_external
PARAMS ((tree
));
287 #endif /* TREE_CODE */
289 /* Assemble code to leave SIZE bytes of zeros. */
290 extern void assemble_zeros
PARAMS ((int));
292 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
293 extern void assemble_align
PARAMS ((int));
294 extern void assemble_eh_align
PARAMS ((int));
296 /* Assemble a string constant with the specified C string as contents. */
297 extern void assemble_string
PARAMS ((const char *, int));
300 /* Similar, for calling a library function FUN. */
301 extern void assemble_external_libcall
PARAMS ((rtx
));
304 /* Declare the label NAME global. */
305 extern void assemble_global
PARAMS ((const char *));
307 /* Assemble a label named NAME. */
308 extern void assemble_label
PARAMS ((const char *));
309 extern void assemble_eh_label
PARAMS ((const char *));
311 /* Output to FILE a reference to the assembler name of a C-level name NAME.
312 If NAME starts with a *, the rest of NAME is output verbatim.
313 Otherwise NAME is transformed in an implementation-defined way
314 (usually by the addition of an underscore).
315 Many macros in the tm file are defined to call this function. */
316 extern void assemble_name
PARAMS ((FILE *, const char *));
318 /* Return the assembler directive for creating a given kind of integer
319 object. SIZE is the number of bytes in the object and ALIGNED_P
320 indicates whether it is known to be aligned. Return NULL if the
321 assembly dialect has no such directive.
323 The returned string should be printed at the start of a new line and
324 be followed immediately by the object's initial value. */
325 extern const char *integer_asm_op
PARAMS ((int, int));
328 /* Use directive OP to assemble an integer object X. Print OP at the
329 start of the line, followed immediately by the value of X. */
330 extern void assemble_integer_with_op
PARAMS ((const char *, rtx
));
332 /* The default implementation of the asm_out.integer target hook. */
333 extern bool default_assemble_integer
PARAMS ((rtx
, unsigned int, int));
335 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
336 the alignment of the integer in bits. Return 1 if we were able to output
337 the constant, otherwise 0. If FORCE is non-zero, abort if we can't output
339 extern bool assemble_integer
PARAMS ((rtx
, unsigned, unsigned, int));
341 /* An interface to assemble_integer for the common case in which a value is
342 fully aligned and must be printed. VALUE is the value of the integer
343 object and SIZE is the number of bytes it contains. */
344 #define assemble_aligned_integer(SIZE, VALUE) \
345 assemble_integer (VALUE, SIZE, (SIZE) * BITS_PER_UNIT, 1)
347 #ifdef REAL_VALUE_TYPE
348 /* Assemble the floating-point constant D into an object of size MODE. */
349 extern void assemble_real
PARAMS ((REAL_VALUE_TYPE
,
355 /* At the end of a function, forget the memory-constants
356 previously made for CONST_DOUBLEs. Mark them as not on real_constant_chain.
357 Also clear out real_constant_chain and clear out all the chain-pointers. */
358 extern void clear_const_double_mem
PARAMS ((void));
360 /* Start deferring output of subconstants. */
361 extern void defer_addressed_constants
PARAMS ((void));
363 /* Stop deferring output of subconstants,
364 and output now all those that have been deferred. */
365 extern void output_deferred_addressed_constants
PARAMS ((void));
367 /* Return the size of the constant pool. */
368 extern int get_pool_size
PARAMS ((void));
371 extern rtx peephole
PARAMS ((rtx
));
375 /* Write all the constants in the constant pool. */
376 extern void output_constant_pool
PARAMS ((const char *, tree
));
378 /* Return nonzero if VALUE is a valid constant-valued expression
379 for use in initializing a static variable; one that can be an
380 element of a "constant" initializer.
382 Return null_pointer_node if the value is absolute;
383 if it is relocatable, return the variable that determines the relocation.
384 We assume that VALUE has been folded as much as possible;
385 therefore, we do not need to check for such things as
386 arithmetic-combinations of integers. */
387 extern tree initializer_constant_valid_p
PARAMS ((tree
, tree
));
389 /* Output assembler code for constant EXP to FILE, with no label.
390 This includes the pseudo-op such as ".int" or ".byte", and a newline.
391 Assumes output_addressed_constants has been done on EXP already.
393 Generate exactly SIZE bytes of assembler data, padding at the end
394 with zeros if necessary. SIZE must always be specified.
396 ALIGN is the alignment in bits that may be assumed for the data. */
397 extern void output_constant
PARAMS ((tree
, HOST_WIDE_INT
,
402 /* When outputting delayed branch sequences, this rtx holds the
403 sequence being output. It is null when no delayed branch
404 sequence is being output, so it can be used as a test in the
407 This variable is defined in final.c. */
408 extern rtx final_sequence
;
411 /* The line number of the beginning of the current function. Various
412 md code needs this so that it can output relative linenumbers. */
414 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers. */
415 extern int sdb_begin_function_line
;
418 /* File in which assembler code is being written. */
421 extern FILE *asm_out_file
;
424 /* The first global object in the file. */
425 extern const char *first_global_object_name
;
427 /* The first weak object in the file. */
428 extern const char *weak_global_object_name
;
430 /* Nonzero if function being compiled doesn't contain any calls
431 (ignoring the prologue and epilogue). This is set prior to
432 local register allocation and is valid for the remaining
435 extern int current_function_is_leaf
;
437 /* Nonzero if function being compiled doesn't contain any instructions
438 that can throw an exception. This is set prior to final. */
440 extern int current_function_nothrow
;
442 /* Nonzero if function being compiled doesn't modify the stack pointer
443 (ignoring the prologue and epilogue). This is only valid after
444 life_analysis has run. */
446 extern int current_function_sp_is_unchanging
;
448 /* Nonzero if the function being compiled is a leaf function which only
449 uses leaf registers. This is valid after reload (specifically after
450 sched2) and is useful only if the port defines LEAF_REGISTERS. */
452 extern int current_function_uses_only_leaf_regs
;
454 /* Default file in which to dump debug output. */
457 extern FILE *rtl_dump_file
;
460 /* Nonnull if the insn currently being emitted was a COND_EXEC pattern. */
461 extern struct rtx_def
*current_insn_predicate
;
463 /* Last insn processed by final_scan_insn. */
464 extern struct rtx_def
*current_output_insn
;
466 /* Decide whether DECL needs to be in a writable section. RELOC is the same
467 as for SELECT_SECTION. */
469 #define DECL_READONLY_SECTION(DECL,RELOC) \
470 (TREE_READONLY (DECL) \
471 && ! TREE_THIS_VOLATILE (DECL) \
472 && DECL_INITIAL (DECL) \
473 && (DECL_INITIAL (DECL) == error_mark_node \
474 || TREE_CONSTANT (DECL_INITIAL (DECL))) \
475 && ! (RELOC && (flag_pic || DECL_ONE_ONLY (DECL))))
477 /* User label prefix in effect for this compilation. */
478 extern const char *user_label_prefix
;
480 /* This macro gets just the user-specified name
481 out of the string in a SYMBOL_REF. On most machines,
482 we discard the * if any and that's all. */
483 #ifndef STRIP_NAME_ENCODING
484 #define STRIP_NAME_ENCODING(VAR,SYMBOL_NAME) \
485 (VAR) = ((SYMBOL_NAME) + ((SYMBOL_NAME)[0] == '*'))
487 /* Assign unique numbers to labels generated for profiling. */
489 extern int profile_label_no
;
491 /* Default target function prologue and epilogue assembler output. */
492 extern void default_function_pro_epilogue
PARAMS ((FILE *, HOST_WIDE_INT
));
494 /* Tell assembler to switch to the section for the exception table. */
495 extern void default_exception_section
PARAMS ((void));
497 /* Tell assembler to switch to the section for the EH frames. */
498 extern void default_eh_frame_section
PARAMS ((void));
500 /* Default target hook that outputs nothing to a stream. */
501 extern void no_asm_to_stream
PARAMS ((FILE *));
503 /* Flags controling properties of a section. */
504 #define SECTION_ENTSIZE 0x000ff /* entity size in section */
505 #define SECTION_CODE 0x00100 /* contains code */
506 #define SECTION_WRITE 0x00200 /* data is writable */
507 #define SECTION_DEBUG 0x00400 /* contains debug data */
508 #define SECTION_LINKONCE 0x00800 /* is linkonce */
509 #define SECTION_SMALL 0x01000 /* contains "small data" */
510 #define SECTION_BSS 0x02000 /* contains zeros only */
511 #define SECTION_FORGET 0x04000 /* forget that we've entered the section */
512 #define SECTION_MERGE 0x08000 /* contains mergeable data */
513 #define SECTION_STRINGS 0x10000 /* contains zero terminated strings without
515 #define SECTION_OVERRIDE 0x20000 /* allow override of default flags */
516 #define SECTION_MACH_DEP 0x40000 /* subsequent bits reserved for target */
518 extern unsigned int get_named_section_flags
PARAMS ((const char *));
519 extern bool set_named_section_flags
PARAMS ((const char *, unsigned int));
520 extern void named_section_flags
PARAMS ((const char *, unsigned int));
521 extern bool named_section_first_declaration
PARAMS((const char *));
524 extern unsigned int default_section_type_flags
PARAMS ((union tree_node
*,
527 extern void default_no_named_section
PARAMS ((const char *, unsigned int));
528 extern void default_elf_asm_named_section
PARAMS ((const char *, unsigned int));
529 extern void default_coff_asm_named_section
PARAMS ((const char *,
531 extern void default_pe_asm_named_section
PARAMS ((const char *, unsigned int));
533 extern void default_stabs_asm_out_destructor
PARAMS ((struct rtx_def
*, int));
534 extern void default_named_section_asm_out_destructor
PARAMS ((struct rtx_def
*,
536 extern void default_dtor_section_asm_out_destructor
PARAMS ((struct rtx_def
*,
538 extern void default_stabs_asm_out_constructor
PARAMS ((struct rtx_def
*, int));
539 extern void default_named_section_asm_out_constructor
PARAMS ((struct rtx_def
*,
541 extern void default_ctor_section_asm_out_constructor
PARAMS ((struct rtx_def
*,
544 /* Emit data for vtable gc for GNU binutils. */
545 extern void assemble_vtable_entry
PARAMS ((struct rtx_def
*, HOST_WIDE_INT
));
546 extern void assemble_vtable_inherit
PARAMS ((struct rtx_def
*,