1 /* Declarations for insn-output.c. These functions are defined in recog.c,
3 Copyright (C) 1987, 1991, 1994, 97-98, 1999 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* Initialize data in final at the beginning of a compilation. */
23 extern void init_final
PROTO((const char *));
25 /* Called at end of source file,
26 to output the block-profiling table for this entire compilation. */
27 extern void end_final
PROTO((const char *));
29 /* Enable APP processing of subsequent output.
30 Used before the output from an `asm' statement. */
31 extern void app_enable
PROTO((void));
33 /* Disable APP processing of subsequent output.
34 Called from varasm.c before most kinds of output. */
35 extern void app_disable
PROTO((void));
37 /* Return the number of slots filled in the current
38 delayed branch sequence (we don't count the insn needing the
39 delay slot). Zero if not in a delayed branch sequence. */
40 extern int dbr_sequence_length
PROTO((void));
42 /* Indicate that branch shortening hasn't yet been done. */
43 extern void init_insn_lengths
PROTO((void));
46 /* Obtain the current length of an insn. If branch shortening has been done,
47 get its actual length. Otherwise, get its maximum length. */
48 extern int get_attr_length
PROTO((rtx
));
50 /* Make a pass over all insns and compute their actual lengths by shortening
51 any branches of variable length if possible. */
52 extern void shorten_branches
PROTO((rtx
));
54 /* Output assembler code for the start of a function,
55 and initialize some of the variables in this file
56 for the new function. The label for the function and associated
57 assembler pseudo-ops have already been output in
58 `assemble_start_function'. */
59 extern void final_start_function
PROTO((rtx
, FILE *, int));
61 /* Output assembler code for the end of a function.
62 For clarity, args are same as those of `final_start_function'
63 even though not all of them are needed. */
64 extern void final_end_function
PROTO((rtx
, FILE *, int));
66 /* Output assembler code for some insns: all or part of a function. */
67 extern void final
PROTO((rtx
, FILE *, int, int));
69 /* The final scan for one insn, INSN. Args are same as in `final', except
70 that INSN is the insn being scanned. Value returned is the next insn to
72 extern rtx final_scan_insn
PROTO((rtx
, FILE *, int, int, int));
74 /* Replace a SUBREG with a REG or a MEM, based on the thing it is a
76 extern rtx alter_subreg
PROTO((rtx
));
78 /* Report inconsistency between the assembler template and the operands.
79 In an `asm', it's the user's fault; otherwise, the compiler's fault. */
80 extern void output_operand_lossage
PROTO((const char *));
82 /* Output a string of assembler code, substituting insn operands.
83 Defined in final.c. */
84 extern void output_asm_insn
PROTO((const char *, rtx
*));
86 /* Compute a worst-case reference address of a branch so that it
87 can be safely used in the presence of aligned labels.
88 Defined in final.c. */
89 extern int insn_current_reference_address
PROTO((rtx
));
91 /* Find the alignment associated with a CODE_LABEL.
92 Defined in final.c. */
93 extern int label_to_alignment
PROTO((rtx
));
95 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */
96 extern void output_asm_label
PROTO((rtx
));
98 /* Print a memory reference operand for address X
99 using machine-dependent assembler syntax. */
100 extern void output_address
PROTO((rtx
));
102 /* Print an integer constant expression in assembler syntax.
103 Addition and subtraction are the only arithmetic
104 that may appear in these expressions. */
105 extern void output_addr_const
PROTO((FILE *, rtx
));
107 /* Output a string of assembler code, substituting numbers, strings
108 and fixed syntactic prefixes. */
109 extern void asm_fprintf
PVPROTO((FILE *file
, const char *p
, ...));
111 /* Split up a CONST_DOUBLE or integer constant rtx into two rtx's for single
113 extern void split_double
PROTO((rtx
, rtx
*, rtx
*));
115 /* Return nonzero if this function has no function calls. */
116 extern int leaf_function_p
PROTO((void));
118 /* Return 1 if this function uses only the registers that can be
119 safely renumbered. */
120 extern int only_leaf_regs_used
PROTO((void));
122 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
123 available in leaf functions. */
124 extern void leaf_renumber_regs_insn
PROTO((rtx
));
126 /* Locate the proper template for the given insn-code. */
127 extern const char *get_insn_template
PROTO((int, rtx
));
129 /* Functions in flow.c */
130 extern void allocate_for_life_analysis
PROTO((void));
131 extern int regno_uninitialized
PROTO((int));
132 extern int regno_clobbered_at_setjmp
PROTO((int));
133 extern void dump_flow_info
PROTO((FILE *));
134 extern void find_basic_blocks
PROTO((rtx
, int, FILE *, int));
135 extern void free_basic_block_vars
PROTO((int));
136 extern void set_block_num
PROTO((rtx
, int));
137 extern void life_analysis
PROTO((rtx
, int, FILE *, int));
140 /* Functions in varasm.c. */
142 /* Tell assembler to switch to text section. */
143 extern void text_section
PROTO((void));
145 /* Tell assembler to switch to data section. */
146 extern void data_section
PROTO((void));
148 /* Tell assembler to make sure its in the data section. */
149 extern void force_data_section
PROTO((void));
151 /* Tell assembler to switch to read-only data section. This is normally
153 extern void readonly_data_section
PROTO((void));
155 /* Determine if we're in the text section. */
156 extern int in_text_section
PROTO((void));
158 #ifdef EH_FRAME_SECTION_ASM_OP
159 extern void eh_frame_section
PROTO ((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));
187 /* Tell assembler to change to section NAME for DECL.
188 If DECL is NULL, just switch to section NAME.
189 If NAME is NULL, get the name from DECL.
190 If RELOC is 1, the initializer for DECL contains relocs. */
191 extern void named_section
PROTO((tree
, const char *, int));
193 /* Tell assembler to switch to the section for function DECL. */
194 extern void function_section
PROTO((tree
));
196 /* Tell assembler to switch to the section for the exception table. */
197 extern void exception_section
PROTO((void));
199 /* Create the rtl to represent a function, for a function definition.
200 DECL is a FUNCTION_DECL node which describes which function.
201 The rtl is stored into DECL. */
202 extern void make_function_rtl
PROTO((tree
));
204 /* Declare DECL to be a weak symbol. */
205 extern void declare_weak
PROTO ((tree
));
206 #endif /* TREE_CODE */
208 /* Emit any pending weak declarations. */
209 extern void weak_finish
PROTO ((void));
211 /* Decode an `asm' spec for a declaration as a register name.
212 Return the register number, or -1 if nothing specified,
213 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
214 or -3 if ASMSPEC is `cc' and is not recognized,
215 or -4 if ASMSPEC is `memory' and is not recognized.
216 Accept an exact spelling or a decimal number.
217 Prefixes such as % are optional. */
218 extern int decode_reg_name
PROTO((const char *));
221 /* Create the DECL_RTL for a declaration for a static or external variable
222 or static or external function.
223 ASMSPEC, if not 0, is the string which the user specified
224 as the assembler symbol name.
225 TOP_LEVEL is nonzero if this is a file-scope variable.
227 This is never called for PARM_DECL nodes. */
228 extern void make_decl_rtl
PROTO((tree
, const char *, int));
230 /* Make the rtl for variable VAR be volatile.
231 Use this only for static variables. */
232 extern void make_var_volatile
PROTO((tree
));
234 /* Output alignment directive to align for constant expression EXP. */
235 extern void assemble_constant_align
PROTO((tree
));
237 extern void assemble_alias
PROTO((tree
, tree
));
239 /* Output a string of literal assembler code
240 for an `asm' keyword used between functions. */
241 extern void assemble_asm
PROTO((tree
));
243 /* Output assembler code for the constant pool of a function and associated
244 with defining the name of the function. DECL describes the function.
245 NAME is the function's name. For the constant pool, we use the current
246 constant pool data. */
247 extern void assemble_start_function
PROTO((tree
, char *));
249 /* Output assembler code associated with defining the size of the
250 function. DECL describes the function. NAME is the function's name. */
251 extern void assemble_end_function
PROTO((tree
, const char *));
253 /* Assemble everything that is needed for a variable or function declaration.
254 Not used for automatic variables, and not used for function definitions.
255 Should not be called for variables of incomplete structure type.
257 TOP_LEVEL is nonzero if this variable has file scope.
258 AT_END is nonzero if this is the special handling, at end of compilation,
259 to define things that have had only tentative definitions.
260 DONT_OUTPUT_DATA if nonzero means don't actually output the
261 initial value (that will be done by the caller). */
262 extern void assemble_variable
PROTO((tree
, int, int, int));
264 /* Output something to declare an external symbol to the assembler.
265 (Most assemblers don't need this, so we normally output nothing.)
266 Do nothing if DECL is not external. */
267 extern void assemble_external
PROTO((tree
));
268 #endif /* TREE_CODE */
270 /* Record an element in the table of global destructors.
271 How this is done depends on what sort of assembler and linker
274 NAME should be the name of a global function to be called
275 at exit time. This name is output using assemble_name. */
276 extern void assemble_destructor
PROTO((const char *));
278 /* Likewise for global constructors. */
279 extern void assemble_constructor
PROTO((const char *));
281 /* Likewise for entries we want to record for garbage collection.
282 Garbage collection is still under development. */
283 extern void assemble_gc_entry
PROTO((const char *));
285 /* Assemble code to leave SIZE bytes of zeros. */
286 extern void assemble_zeros
PROTO((int));
288 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
289 extern void assemble_align
PROTO((int));
291 /* Assemble a string constant with the specified C string as contents. */
292 extern void assemble_string
PROTO((const char *, int));
295 /* Similar, for calling a library function FUN. */
296 extern void assemble_external_libcall
PROTO((rtx
));
299 /* Declare the label NAME global. */
300 extern void assemble_global
PROTO((const char *));
302 /* Assemble a label named NAME. */
303 extern void assemble_label
PROTO((const char *));
305 /* Output to FILE a reference to the assembler name of a C-level name NAME.
306 If NAME starts with a *, the rest of NAME is output verbatim.
307 Otherwise NAME is transformed in an implementation-defined way
308 (usually by the addition of an underscore).
309 Many macros in the tm file are defined to call this function. */
310 extern void assemble_name
PROTO((FILE *, const char *));
313 /* Assemble the integer constant X into an object of SIZE bytes.
314 X must be either a CONST_INT or CONST_DOUBLE.
316 Return 1 if we were able to output the constant, otherwise 0. If FORCE is
317 non-zero, abort if we can't output the constant. */
318 extern int assemble_integer
PROTO((rtx
, int, int));
321 /* Assemble the floating-point constant D into an object of size MODE. */
322 extern void assemble_real
PROTO((REAL_VALUE_TYPE
,
327 /* At the end of a function, forget the memory-constants
328 previously made for CONST_DOUBLEs. Mark them as not on real_constant_chain.
329 Also clear out real_constant_chain and clear out all the chain-pointers. */
330 extern void clear_const_double_mem
PROTO((void));
332 /* Start deferring output of subconstants. */
333 extern void defer_addressed_constants
PROTO((void));
335 /* Stop deferring output of subconstants,
336 and output now all those that have been deferred. */
337 extern void output_deferred_addressed_constants
PROTO((void));
339 /* Return the size of the constant pool. */
340 extern int get_pool_size
PROTO((void));
343 extern rtx peephole
PROTO((rtx
));
347 /* Write all the constants in the constant pool. */
348 extern void output_constant_pool
PROTO((const char *, tree
));
350 /* Return nonzero if VALUE is a valid constant-valued expression
351 for use in initializing a static variable; one that can be an
352 element of a "constant" initializer.
354 Return null_pointer_node if the value is absolute;
355 if it is relocatable, return the variable that determines the relocation.
356 We assume that VALUE has been folded as much as possible;
357 therefore, we do not need to check for such things as
358 arithmetic-combinations of integers. */
359 extern tree initializer_constant_valid_p
PROTO((tree
, tree
));
361 /* Output assembler code for constant EXP to FILE, with no label.
362 This includes the pseudo-op such as ".int" or ".byte", and a newline.
363 Assumes output_addressed_constants has been done on EXP already.
365 Generate exactly SIZE bytes of assembler data, padding at the end
366 with zeros if necessary. SIZE must always be specified. */
367 extern void output_constant
PROTO((tree
, int));
370 /* When outputting assembler code, indicates which alternative
371 of the constraints was actually satisfied. */
372 extern int which_alternative
;
375 /* When outputting delayed branch sequences, this rtx holds the
376 sequence being output. It is null when no delayed branch
377 sequence is being output, so it can be used as a test in the
380 This variable is defined in final.c. */
381 extern rtx final_sequence
;
384 /* Nonzero means generate position-independent code.
385 This is not fully implemented yet. */
389 /* The line number of the beginning of the current function.
390 sdbout.c needs this so that it can output relative linenumbers. */
392 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers. */
393 extern int sdb_begin_function_line
;
396 /* File in which assembler code is being written. */
399 extern FILE *asm_out_file
;
401 /* Nonzero if function being compiled doesn't contain any calls
402 (ignoring the prologue and epilogue). This is set prior to
403 local register allocation and is valid for the remaining
406 extern int current_function_is_leaf
;
408 /* Nonzero if function being compiled doesn't modify the stack pointer
409 (ignoring the prologue and epilogue). This is only valid after
410 life_analysis has run. */
412 extern int current_function_sp_is_unchanging
;
414 /* Nonzero if the function being compiled is a leaf function which only
415 uses leaf registers. This is valid after reload (specifically after
416 sched2) and is useful only if the port defines LEAF_REGISTERS. */
418 extern int current_function_uses_only_leaf_regs
;
420 /* Default file in which to dump debug output. */
423 extern FILE *rtl_dump_file
;
426 /* Decide whether DECL needs to be in a writable section. RELOC is the same
427 as for SELECT_SECTION. */
429 #define DECL_READONLY_SECTION(DECL,RELOC) \
430 (TREE_READONLY (DECL) \
431 && ! TREE_THIS_VOLATILE (DECL) \
432 && DECL_INITIAL (DECL) \
433 && (DECL_INITIAL (DECL) == error_mark_node \
434 || TREE_CONSTANT (DECL_INITIAL (DECL))) \
435 && ! (RELOC && (flag_pic || DECL_ONE_ONLY (DECL))))
437 /* User label prefix in effect for this compilation. */
438 extern const char *user_label_prefix
;
440 /* This macro gets just the user-specified name
441 out of the string in a SYMBOL_REF. On most machines,
442 we discard the * if any and that's all. */
443 #ifndef STRIP_NAME_ENCODING
444 #define STRIP_NAME_ENCODING(VAR,SYMBOL_NAME) \
445 (VAR) = ((SYMBOL_NAME) + ((SYMBOL_NAME)[0] == '*'))