1 /* Declarations for insn-output.c. These functions are defined in recog.c,
3 Copyright (C) 1987, 1991, 1994 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* Initialize data in final at the beginning of a compilation. */
22 extern void init_final
PROTO((char *));
24 /* Called at end of source file,
25 to output the block-profiling table for this entire compilation. */
26 extern void end_final
PROTO((char *));
28 /* Enable APP processing of subsequent output.
29 Used before the output from an `asm' statement. */
30 extern void app_enable
PROTO((void));
32 /* Disable APP processing of subsequent output.
33 Called from varasm.c before most kinds of output. */
34 extern void app_disable
PROTO((void));
36 /* Return the number of slots filled in the current
37 delayed branch sequence (we don't count the insn needing the
38 delay slot). Zero if not in a delayed branch sequence. */
39 extern int dbr_sequence_length
PROTO((void));
41 /* Indicate that branch shortening hasn't yet been done. */
42 extern void init_insn_lengths
PROTO((void));
45 /* Obtain the current length of an insn. If branch shortening has been done,
46 get its actual length. Otherwise, get its maximum length. */
47 extern int get_attr_length
PROTO((rtx
));
49 /* Make a pass over all insns and compute their actual lengths by shortening
50 any branches of variable length if possible. */
51 extern void shorten_branches
PROTO((rtx
));
53 /* Output assembler code for the start of a function,
54 and initialize some of the variables in this file
55 for the new function. The label for the function and associated
56 assembler pseudo-ops have already been output in
57 `assemble_start_function'. */
58 extern void final_start_function
STDIO_PROTO((rtx
, FILE *, int));
60 /* Output assembler code for the end of a function.
61 For clarity, args are same as those of `final_start_function'
62 even though not all of them are needed. */
63 extern void final_end_function
STDIO_PROTO((rtx
, FILE *, int));
65 /* Output assembler code for some insns: all or part of a function. */
66 extern void final
STDIO_PROTO((rtx
, FILE *, int, int));
68 /* The final scan for one insn, INSN. Args are same as in `final', except
69 that INSN is the insn being scanned. Value returned is the next insn to
71 extern rtx final_scan_insn
STDIO_PROTO((rtx
, FILE *, int, int, int));
73 /* Replace a SUBREG with a REG or a MEM, based on the thing it is a
75 extern rtx alter_subreg
PROTO((rtx
));
77 /* Report inconsistency between the assembler template and the operands.
78 In an `asm', it's the user's fault; otherwise, the compiler's fault. */
79 extern void output_operand_lossage
PROTO((char *));
81 /* Output a string of assembler code, substituting insn operands.
82 Defined in final.c. */
83 extern void output_asm_insn
PROTO((char *, rtx
*));
85 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol. */
86 extern void output_asm_label
PROTO((rtx
));
88 /* Print a memory reference operand for address X
89 using machine-dependent assembler syntax. */
90 extern void output_address
PROTO((rtx
));
92 /* Print an integer constant expression in assembler syntax.
93 Addition and subtraction are the only arithmetic
94 that may appear in these expressions. */
95 extern void output_addr_const
STDIO_PROTO((FILE *, rtx
));
97 /* Output a string of assembler code, substituting numbers, strings
98 and fixed syntactic prefixes. */
99 extern void asm_fprintf
STDIO_PROTO(PVPROTO((FILE *file
,
102 /* Split up a CONST_DOUBLE or integer constant rtx into two rtx's for single
104 extern void split_double
PROTO((rtx
, rtx
*, rtx
*));
106 /* Return nonzero if this function has no function calls. */
107 extern int leaf_function_p
PROTO((void));
109 /* Return 1 if this function uses only the registers that can be
110 safely renumbered. */
111 extern int only_leaf_regs_used
PROTO((void));
113 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
114 available in leaf functions. */
115 extern void leaf_renumber_regs_insn
PROTO((rtx
));
118 /* Functions in varasm.c. */
120 /* Tell assembler to switch to text section. */
121 extern void text_section
PROTO((void));
123 /* Tell assembler to switch to data section. */
124 extern void data_section
PROTO((void));
126 /* Tell assembler to switch to read-only data section. This is normally
128 extern void readonly_data_section
PROTO((void));
130 /* Determine if we're in the text section. */
131 extern int in_text_section
PROTO((void));
134 /* Tell assembler to change to section NAME for DECL.
135 If DECL is NULL, just switch to section NAME.
136 If NAME is NULL, get the name from DECL. */
137 extern void named_section
PROTO((tree
, char *));
139 /* Create the rtl to represent a function, for a function definition.
140 DECL is a FUNCTION_DECL node which describes which function.
141 The rtl is stored into DECL. */
142 extern void make_function_rtl
PROTO((tree
));
144 /* Decode an `asm' spec for a declaration as a register name.
145 Return the register number, or -1 if nothing specified,
146 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
147 or -3 if ASMSPEC is `cc' and is not recognized,
148 or -4 if ASMSPEC is `memory' and is not recognized.
149 Accept an exact spelling or a decimal number.
150 Prefixes such as % are optional. */
151 extern int decode_reg_name
PROTO((char *));
153 /* Create the DECL_RTL for a declaration for a static or external variable
154 or static or external function.
155 ASMSPEC, if not 0, is the string which the user specified
156 as the assembler symbol name.
157 TOP_LEVEL is nonzero if this is a file-scope variable.
159 This is never called for PARM_DECL nodes. */
160 extern void make_decl_rtl
PROTO((tree
, char *, int));
162 /* Make the rtl for variable VAR be volatile.
163 Use this only for static variables. */
164 extern void make_var_volatile
PROTO((tree
));
166 /* Output alignment directive to align for constant expression EXP. */
167 extern void assemble_constant_align
PROTO((tree
));
169 /* Output a string of literal assembler code
170 for an `asm' keyword used between functions. */
171 extern void assemble_asm
PROTO((tree
));
173 /* Record an element in the table of global destructors.
174 How this is done depends on what sort of assembler and linker
177 NAME should be the name of a global function to be called
178 at exit time. This name is output using assemble_name. */
179 extern void assemble_destructor
PROTO((char *));
181 /* Likewise for global constructors. */
182 extern void assemble_constructor
PROTO((char *));
184 /* Likewise for entries we want to record for garbage collection.
185 Garbage collection is still under development. */
186 extern void assemble_gc_entry
PROTO((char *));
188 /* Output assembler code for the constant pool of a function and associated
189 with defining the name of the function. DECL describes the function.
190 NAME is the function's name. For the constant pool, we use the current
191 constant pool data. */
192 extern void assemble_start_function
PROTO((tree
, char *));
194 /* Output assembler code associated with defining the size of the
195 function. DECL describes the function. NAME is the function's name. */
196 extern void assemble_end_function
PROTO((tree
, char *));
198 /* Assemble code to leave SIZE bytes of zeros. */
199 extern void assemble_zeros
PROTO((int));
201 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
202 extern void assemble_align
PROTO((int));
204 /* Assemble a string constant with the specified C string as contents. */
205 extern void assemble_string
PROTO((char *, int));
206 /* Assemble everything that is needed for a variable or function declaration.
207 Not used for automatic variables, and not used for function definitions.
208 Should not be called for variables of incomplete structure type.
210 TOP_LEVEL is nonzero if this variable has file scope.
211 AT_END is nonzero if this is the special handling, at end of compilation,
212 to define things that have had only tentative definitions.
213 DONT_OUTPUT_DATA if nonzero means don't actually output the
214 initial value (that will be done by the caller). */
215 extern void assemble_variable
PROTO((tree
, int, int, int));
217 /* Output text storage for constructor CONSTR. */
218 extern void bc_output_constructor
PROTO((tree
, int));
220 /* Create storage for constructor CONSTR. */
221 extern void bc_output_data_constructor
PROTO((tree
));
223 /* Output something to declare an external symbol to the assembler.
224 (Most assemblers don't need this, so we normally output nothing.)
225 Do nothing if DECL is not external. */
226 extern void assemble_external
PROTO((tree
));
230 /* Similar, for calling a library function FUN. */
231 extern void assemble_external_libcall
PROTO((rtx
));
234 /* Declare the label NAME global. */
235 extern void assemble_global
PROTO((char *));
237 /* Assemble a label named NAME. */
238 extern void assemble_label
PROTO((char *));
240 /* Output to FILE a reference to the assembler name of a C-level name NAME.
241 If NAME starts with a *, the rest of NAME is output verbatim.
242 Otherwise NAME is transformed in an implementation-defined way
243 (usually by the addition of an underscore).
244 Many macros in the tm file are defined to call this function. */
245 extern void assemble_name
STDIO_PROTO((FILE *, char *));
248 /* Assemble the integer constant X into an object of SIZE bytes.
249 X must be either a CONST_INT or CONST_DOUBLE.
251 Return 1 if we were able to output the constant, otherwise 0. If FORCE is
252 non-zero, abort if we can't output the constant. */
253 extern int assemble_integer
PROTO((rtx
, int, int));
256 /* Assemble the floating-point constant D into an object of size MODE. */
257 extern void assemble_real
PROTO((REAL_VALUE_TYPE
,
262 /* At the end of a function, forget the memory-constants
263 previously made for CONST_DOUBLEs. Mark them as not on real_constant_chain.
264 Also clear out real_constant_chain and clear out all the chain-pointers. */
265 extern void clear_const_double_mem
PROTO((void));
267 /* Start deferring output of subconstants. */
268 extern void defer_addressed_constants
PROTO((void));
270 /* Stop deferring output of subconstants,
271 and output now all those that have been deferred. */
272 extern void output_deferred_addressed_constants
PROTO((void));
274 /* Initialize constant pool hashing for next function. */
275 extern void init_const_rtx_hash_table
PROTO((void));
277 /* Return the size of the constant pool. */
278 extern int get_pool_size
PROTO((void));
281 /* Write all the constants in the constant pool. */
282 extern void output_constant_pool
PROTO((char *, tree
));
284 /* Output assembler code for constant EXP to FILE, with no label.
285 This includes the pseudo-op such as ".int" or ".byte", and a newline.
286 Assumes output_addressed_constants has been done on EXP already.
288 Generate exactly SIZE bytes of assembler data, padding at the end
289 with zeros if necessary. SIZE must always be specified. */
290 extern void output_constant
PROTO((tree
, int));
293 /* When outputting assembler code, indicates which alternative
294 of the constraints was actually satisfied. */
295 extern int which_alternative
;
298 /* When outputting delayed branch sequences, this rtx holds the
299 sequence being output. It is null when no delayed branch
300 sequence is being output, so it can be used as a test in the
303 This variable is defined in final.c. */
304 extern rtx final_sequence
;
307 /* Number of bytes of args popped by function being compiled on its return.
308 Zero if no bytes are to be popped.
309 May affect compilation of return insn or of function epilogue. */
311 extern int current_function_pops_args
;
313 /* Nonzero if function being compiled needs to be given an address
314 where the value should be stored. */
316 extern int current_function_returns_struct
;
318 /* Nonzero if function being compiled needs to
319 return the address of where it has put a structure value. */
321 extern int current_function_returns_pcc_struct
;
323 /* Nonzero if function being compiled needs to be passed a static chain. */
325 extern int current_function_needs_context
;
327 /* Nonzero if function being compiled can call setjmp. */
329 extern int current_function_calls_setjmp
;
331 /* Nonzero if function being compiled can call longjmp. */
333 extern int current_function_calls_longjmp
;
335 /* Nonzero if function being compiled can call alloca,
336 either as a subroutine or builtin. */
338 extern int current_function_calls_alloca
;
340 /* Nonzero if function being compiled receives nonlocal gotos
341 from nested functions. */
343 extern int current_function_has_nonlocal_label
;
345 /* Nonzero if function being compiled contains nested functions. */
347 extern int current_function_contains_functions
;
349 /* Nonzero if the current function returns a pointer type */
351 extern int current_function_returns_pointer
;
353 /* If function's args have a fixed size, this is that size, in bytes.
355 May affect compilation of return insn or of function epilogue. */
357 extern int current_function_args_size
;
359 /* # bytes the prologue should push and pretend that the caller pushed them.
360 The prologue must do this, but only if parms can be passed in registers. */
362 extern int current_function_pretend_args_size
;
364 /* # of bytes of outgoing arguments required to be pushed by the prologue.
365 If this is non-zero, it means that ACCUMULATE_OUTGOING_ARGS was defined
366 and no stack adjusts will be done on function calls. */
368 extern int current_function_outgoing_args_size
;
370 /* Nonzero if current function uses varargs.h or equivalent.
371 Zero for functions that use stdarg.h. */
373 extern int current_function_varargs
;
375 /* Quantities of various kinds of registers
376 used for the current function's args. */
378 extern CUMULATIVE_ARGS current_function_args_info
;
380 /* Name of function now being compiled. */
382 extern char *current_function_name
;
385 /* If non-zero, an RTL expression for that location at which the current
386 function returns its result. Usually equal to
387 DECL_RTL (DECL_RESULT (current_function_decl)). */
389 extern rtx current_function_return_rtx
;
391 /* If some insns can be deferred to the delay slots of the epilogue, the
392 delay list for them is recorded here. */
394 extern rtx current_function_epilogue_delay_list
;
397 /* Nonzero means generate position-independent code.
398 This is not fully implemented yet. */
402 /* This is nonzero if the current function uses pic_offset_table_rtx. */
403 extern int current_function_uses_pic_offset_table
;
405 /* This is nonzero if the current function uses the constant pool. */
406 extern int current_function_uses_const_pool
;
408 /* The line number of the beginning of the current function.
409 sdbout.c needs this so that it can output relative linenumbers. */
411 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers. */
412 extern int sdb_begin_function_line
;
415 /* File in which assembler code is being written. */
418 extern FILE *asm_out_file
;