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 GNU CC.
8 GNU CC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GNU CC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU CC; see the file COPYING. If not, write to
20 the Free Software Foundation, 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 /* Initialize data in final at the beginning of a compilation. */
24 extern void init_final PARAMS ((const char *));
26 /* Called at end of source file,
27 to output the block-profiling table for this entire compilation. */
28 extern void end_final PARAMS ((const char *));
30 /* Enable APP processing of subsequent output.
31 Used before the output from an `asm' statement. */
32 extern void app_enable PARAMS ((void));
34 /* Disable APP processing of subsequent output.
35 Called from varasm.c before most kinds of output. */
36 extern void app_disable PARAMS ((void));
38 /* Return the number of slots filled in the current
39 delayed branch sequence (we don't count the insn needing the
40 delay slot). Zero if not in a delayed branch sequence. */
41 extern int dbr_sequence_length PARAMS ((void));
43 /* Indicate that branch shortening hasn't yet been done. */
44 extern void init_insn_lengths PARAMS ((void));
47 /* Obtain the current length of an insn. If branch shortening has been done,
48 get its actual length. Otherwise, get its maximum length. */
49 extern int get_attr_length PARAMS ((rtx));
51 /* Make a pass over all insns and compute their actual lengths by shortening
52 any branches of variable length if possible. */
53 extern void shorten_branches PARAMS ((rtx));
55 /* Output assembler code for the start of a function,
56 and initialize some of the variables in this file
57 for the new function. The label for the function and associated
58 assembler pseudo-ops have already been output in
59 `assemble_start_function'. */
60 extern void final_start_function PARAMS ((rtx, FILE *, int));
62 /* Output assembler code for the end of a function.
63 For clarity, args are same as those of `final_start_function'
64 even though not all of them are needed. */
65 extern void final_end_function PARAMS ((void));
67 /* Output assembler code for some insns: all or part of a function. */
68 extern void final PARAMS ((rtx, FILE *, int, int));
70 /* The final scan for one insn, INSN. Args are same as in `final', except
71 that INSN is the insn being scanned. Value returned is the next insn to
73 extern rtx final_scan_insn PARAMS ((rtx, FILE *, int, int, int));
75 /* Replace a SUBREG with a REG or a MEM, based on the thing it is a
77 extern rtx alter_subreg PARAMS ((rtx));
79 /* Report inconsistency between the assembler template and the operands.
80 In an `asm', it's the user's fault; otherwise, the compiler's fault. */
81 extern void output_operand_lossage PARAMS ((const char *));
83 /* Output a string of assembler code, substituting insn operands.
84 Defined in final.c. */
85 extern void output_asm_insn PARAMS ((const char *, rtx *));
87 /* Compute a worst-case reference address of a branch so that it
88 can be safely used in the presence of aligned labels.
89 Defined in final.c. */
90 extern int insn_current_reference_address PARAMS ((rtx));
92 /* Find the alignment associated with a CODE_LABEL.
93 Defined in final.c. */
94 extern int label_to_alignment PARAMS ((rtx));
96 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */
97 extern void output_asm_label PARAMS ((rtx));
99 /* Print a memory reference operand for address X
100 using machine-dependent assembler syntax. */
101 extern void output_address PARAMS ((rtx));
103 /* Print an integer constant expression in assembler syntax.
104 Addition and subtraction are the only arithmetic
105 that may appear in these expressions. */
106 extern void output_addr_const PARAMS ((FILE *, rtx));
108 /* Output a string of assembler code, substituting numbers, strings
109 and fixed syntactic prefixes. */
110 extern void asm_fprintf PARAMS ((FILE *file, const char *p, ...));
112 /* Split up a CONST_DOUBLE or integer constant rtx into two rtx's for single
114 extern void split_double PARAMS ((rtx, rtx *, rtx *));
116 /* Return nonzero if this function has no function calls. */
117 extern int leaf_function_p PARAMS ((void));
119 /* Return 1 if branch is an forward branch.
120 Uses insn_shuid array, so it works only in the final pass. May be used by
121 output templates to add branch prediction hints, for example. */
122 extern int final_forward_branch_p PARAMS ((rtx));
124 /* Return 1 if this function uses only the registers that can be
125 safely renumbered. */
126 extern int only_leaf_regs_used PARAMS ((void));
128 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
129 available in leaf functions. */
130 extern void leaf_renumber_regs_insn PARAMS ((rtx));
132 /* Locate the proper template for the given insn-code. */
133 extern const char *get_insn_template PARAMS ((int, rtx));
135 /* Functions in flow.c */
136 extern void allocate_for_life_analysis PARAMS ((void));
137 extern int regno_uninitialized PARAMS ((int));
138 extern int regno_clobbered_at_setjmp PARAMS ((int));
139 extern void find_basic_blocks PARAMS ((rtx, int, FILE *));
140 extern void cleanup_cfg PARAMS ((int));
141 extern void check_function_return_warnings PARAMS ((void));
144 /* Functions in varasm.c. */
146 /* Tell assembler to switch to text section. */
147 extern void text_section PARAMS ((void));
149 /* Tell assembler to switch to data section. */
150 extern void data_section PARAMS ((void));
152 /* Tell assembler to make sure its in the data section. */
153 extern void force_data_section PARAMS ((void));
155 /* Tell assembler to switch to read-only data section. This is normally
157 extern void readonly_data_section PARAMS ((void));
159 /* Determine if we're in the text section. */
160 extern int in_text_section PARAMS ((void));
162 #ifdef CTORS_SECTION_ASM_OP
163 extern void ctors_section PARAMS ((void));
166 #ifdef DTORS_SECTION_ASM_OP
167 extern void dtors_section PARAMS ((void));
170 #ifdef BSS_SECTION_ASM_OP
171 extern void bss_section PARAMS ((void));
174 #ifdef CONST_SECTION_ASM_OP
175 extern void const_section PARAMS ((void));
178 #ifdef INIT_SECTION_ASM_OP
179 extern void init_section PARAMS ((void));
182 #ifdef FINI_SECTION_ASM_OP
183 extern void fini_section PARAMS ((void));
186 #ifdef TDESC_SECTION_ASM_OP
187 extern void tdesc_section PARAMS ((void));
191 /* Tell assembler to change to section NAME for DECL.
192 If DECL is NULL, just switch to section NAME.
193 If NAME is NULL, get the name from DECL.
194 If RELOC is 1, the initializer for DECL contains relocs. */
195 extern void named_section PARAMS ((tree, const char *, int));
197 /* Tell assembler to switch to the section for function DECL. */
198 extern void function_section PARAMS ((tree));
200 /* Tell assembler to switch to the section for the exception table. */
201 extern void exception_section PARAMS ((void));
203 /* Declare DECL to be a weak symbol. */
204 extern void declare_weak PARAMS ((tree));
205 #endif /* TREE_CODE */
207 /* Emit any pending weak declarations. */
208 extern void weak_finish PARAMS ((void));
210 /* Decode an `asm' spec for a declaration as a register name.
211 Return the register number, or -1 if nothing specified,
212 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
213 or -3 if ASMSPEC is `cc' and is not recognized,
214 or -4 if ASMSPEC is `memory' and is not recognized.
215 Accept an exact spelling or a decimal number.
216 Prefixes such as % are optional. */
217 extern int decode_reg_name PARAMS ((const char *));
220 /* Make the rtl for variable VAR be volatile.
221 Use this only for static variables. */
222 extern void make_var_volatile PARAMS ((tree));
224 /* Output alignment directive to align for constant expression EXP. */
225 extern void assemble_constant_align PARAMS ((tree));
227 extern void assemble_alias PARAMS ((tree, tree));
229 /* Output a string of literal assembler code
230 for an `asm' keyword used between functions. */
231 extern void assemble_asm PARAMS ((tree));
233 /* Output assembler code for the constant pool of a function and associated
234 with defining the name of the function. DECL describes the function.
235 NAME is the function's name. For the constant pool, we use the current
236 constant pool data. */
237 extern void assemble_start_function PARAMS ((tree, const char *));
239 /* Output assembler code associated with defining the size of the
240 function. DECL describes the function. NAME is the function's name. */
241 extern void assemble_end_function PARAMS ((tree, const char *));
243 /* Assemble everything that is needed for a variable or function declaration.
244 Not used for automatic variables, and not used for function definitions.
245 Should not be called for variables of incomplete structure type.
247 TOP_LEVEL is nonzero if this variable has file scope.
248 AT_END is nonzero if this is the special handling, at end of compilation,
249 to define things that have had only tentative definitions.
250 DONT_OUTPUT_DATA if nonzero means don't actually output the
251 initial value (that will be done by the caller). */
252 extern void assemble_variable PARAMS ((tree, int, int, int));
254 /* Output something to declare an external symbol to the assembler.
255 (Most assemblers don't need this, so we normally output nothing.)
256 Do nothing if DECL is not external. */
257 extern void assemble_external PARAMS ((tree));
258 #endif /* TREE_CODE */
261 /* Record an element in the table of global destructors. The argument
262 should be a SYMBOL_REF of the function to be called. */
263 extern void assemble_destructor PARAMS ((rtx, int));
265 /* Likewise for global constructors. */
266 extern void assemble_constructor PARAMS ((rtx, int));
269 /* Assemble code to leave SIZE bytes of zeros. */
270 extern void assemble_zeros PARAMS ((int));
272 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
273 extern void assemble_align PARAMS ((int));
274 extern void assemble_eh_align PARAMS ((int));
276 /* Assemble a string constant with the specified C string as contents. */
277 extern void assemble_string PARAMS ((const char *, int));
280 /* Similar, for calling a library function FUN. */
281 extern void assemble_external_libcall PARAMS ((rtx));
284 /* Declare the label NAME global. */
285 extern void assemble_global PARAMS ((const char *));
287 /* Assemble a label named NAME. */
288 extern void assemble_label PARAMS ((const char *));
289 extern void assemble_eh_label PARAMS ((const char *));
291 /* Output to FILE a reference to the assembler name of a C-level name NAME.
292 If NAME starts with a *, the rest of NAME is output verbatim.
293 Otherwise NAME is transformed in an implementation-defined way
294 (usually by the addition of an underscore).
295 Many macros in the tm file are defined to call this function. */
296 extern void assemble_name PARAMS ((FILE *, const char *));
299 /* Assemble the integer constant X into an object of SIZE bytes.
300 X must be either a CONST_INT or CONST_DOUBLE.
302 Return 1 if we were able to output the constant, otherwise 0. If FORCE is
303 non-zero, abort if we can't output the constant. */
304 extern int assemble_integer PARAMS ((rtx, int, int));
305 extern int assemble_eh_integer PARAMS ((rtx, int, int));
307 #ifdef REAL_VALUE_TYPE
308 /* Assemble the floating-point constant D into an object of size MODE. */
309 extern void assemble_real PARAMS ((REAL_VALUE_TYPE,
314 /* At the end of a function, forget the memory-constants
315 previously made for CONST_DOUBLEs. Mark them as not on real_constant_chain.
316 Also clear out real_constant_chain and clear out all the chain-pointers. */
317 extern void clear_const_double_mem PARAMS ((void));
319 /* Start deferring output of subconstants. */
320 extern void defer_addressed_constants PARAMS ((void));
322 /* Stop deferring output of subconstants,
323 and output now all those that have been deferred. */
324 extern void output_deferred_addressed_constants PARAMS ((void));
326 /* Return the size of the constant pool. */
327 extern int get_pool_size PARAMS ((void));
330 extern rtx peephole PARAMS ((rtx));
334 /* Write all the constants in the constant pool. */
335 extern void output_constant_pool PARAMS ((const char *, tree));
337 /* Return nonzero if VALUE is a valid constant-valued expression
338 for use in initializing a static variable; one that can be an
339 element of a "constant" initializer.
341 Return null_pointer_node if the value is absolute;
342 if it is relocatable, return the variable that determines the relocation.
343 We assume that VALUE has been folded as much as possible;
344 therefore, we do not need to check for such things as
345 arithmetic-combinations of integers. */
346 extern tree initializer_constant_valid_p PARAMS ((tree, tree));
348 /* Output assembler code for constant EXP to FILE, with no label.
349 This includes the pseudo-op such as ".int" or ".byte", and a newline.
350 Assumes output_addressed_constants has been done on EXP already.
352 Generate exactly SIZE bytes of assembler data, padding at the end
353 with zeros if necessary. SIZE must always be specified. */
354 extern void output_constant PARAMS ((tree, int));
358 /* When outputting delayed branch sequences, this rtx holds the
359 sequence being output. It is null when no delayed branch
360 sequence is being output, so it can be used as a test in the
363 This variable is defined in final.c. */
364 extern rtx final_sequence;
367 /* The line number of the beginning of the current function. Various
368 md code needs this so that it can output relative linenumbers. */
370 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers. */
371 extern int sdb_begin_function_line;
374 /* File in which assembler code is being written. */
377 extern FILE *asm_out_file;
380 /* The first global object in the file. */
381 extern const char *first_global_object_name;
383 /* The first weak object in the file. */
384 extern const char *weak_global_object_name;
386 /* Nonzero if function being compiled doesn't contain any calls
387 (ignoring the prologue and epilogue). This is set prior to
388 local register allocation and is valid for the remaining
391 extern int current_function_is_leaf;
393 /* Nonzero if function being compiled doesn't contain any instructions
394 that can throw an exception. This is set prior to final. */
396 extern int current_function_nothrow;
398 /* Nonzero if function being compiled doesn't modify the stack pointer
399 (ignoring the prologue and epilogue). This is only valid after
400 life_analysis has run. */
402 extern int current_function_sp_is_unchanging;
404 /* Nonzero if the function being compiled is a leaf function which only
405 uses leaf registers. This is valid after reload (specifically after
406 sched2) and is useful only if the port defines LEAF_REGISTERS. */
408 extern int current_function_uses_only_leaf_regs;
410 /* Default file in which to dump debug output. */
413 extern FILE *rtl_dump_file;
416 /* Nonnull if the insn currently being emitted was a COND_EXEC pattern. */
417 extern struct rtx_def *current_insn_predicate;
419 /* Last insn processed by final_scan_insn. */
420 extern struct rtx_def *current_output_insn;
422 /* Decide whether DECL needs to be in a writable section. RELOC is the same
423 as for SELECT_SECTION. */
425 #define DECL_READONLY_SECTION(DECL,RELOC) \
426 (TREE_READONLY (DECL) \
427 && ! TREE_THIS_VOLATILE (DECL) \
428 && DECL_INITIAL (DECL) \
429 && (DECL_INITIAL (DECL) == error_mark_node \
430 || TREE_CONSTANT (DECL_INITIAL (DECL))) \
431 && ! (RELOC && (flag_pic || DECL_ONE_ONLY (DECL))))
433 /* User label prefix in effect for this compilation. */
434 extern const char *user_label_prefix;
436 /* This macro gets just the user-specified name
437 out of the string in a SYMBOL_REF. On most machines,
438 we discard the * if any and that's all. */
439 #ifndef STRIP_NAME_ENCODING
440 #define STRIP_NAME_ENCODING(VAR,SYMBOL_NAME) \
441 (VAR) = ((SYMBOL_NAME) + ((SYMBOL_NAME)[0] == '*'))
443 /* Assign unique numbers to labels generated for profiling. */
445 extern int profile_label_no;
447 /* Default target function prologue and epilogue assembler output. */
448 extern void default_function_pro_epilogue PARAMS ((FILE *, HOST_WIDE_INT));
450 /* Default target hook that outputs nothing to a stream. */
451 extern void no_asm_to_stream PARAMS ((FILE *));
453 /* Flags controling properties of a section. */
454 #define SECTION_CODE 1 /* contains code */
455 #define SECTION_WRITE 2 /* data is writable */
456 #define SECTION_DEBUG 4 /* contains debug data */
457 #define SECTION_LINKONCE 8 /* is linkonce */
458 #define SECTION_SMALL 16 /* contains "small data" */
459 #define SECTION_BSS 32 /* contains zeros only */
460 #define SECTION_FORGET 64 /* forget that we've entered the section */
461 #define SECTION_MACH_DEP 128 /* subsequent bits reserved for target */
463 extern void named_section_flags PARAMS ((const char *, unsigned int,
467 extern unsigned int default_section_type_flags PARAMS ((union tree_node *,
470 extern void default_no_named_section PARAMS ((const char *, unsigned int,
472 extern void default_elf_asm_named_section PARAMS ((const char *, unsigned int,
474 extern void default_coff_asm_named_section PARAMS ((const char *, unsigned int,
476 extern void default_pe_asm_named_section PARAMS ((const char *, unsigned int,