gcc/output.h

   1 /* Declarations for insn-output.c.  These functions are defined in recog.c,
   2    final.c, and varasm.c.
   3    Copyright (C) 1987, 1991, 1994 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   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)
  10 any later version.
  11
  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.
  16
  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.  */
  21
  22 /* Initialize data in final at the beginning of a compilation.  */
  23 extern void init_final          PROTO((char *));
  24
  25 /* Called at end of source file,
  26    to output the block-profiling table for this entire compilation.  */
  27 extern void end_final           PROTO((char *));
  28
  29 /* Enable APP processing of subsequent output.
  30    Used before the output from an `asm' statement.  */
  31 extern void app_enable          PROTO((void));
  32
  33 /* Disable APP processing of subsequent output.
  34    Called from varasm.c before most kinds of output.  */
  35 extern void app_disable         PROTO((void));
  36
  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));
  41
  42 /* Indicate that branch shortening hasn't yet been done.  */
  43 extern void init_insn_lengths   PROTO((void));
  44
  45 #ifdef RTX_CODE
  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));
  49
  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));
  53
  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  STDIO_PROTO((rtx, FILE *, int));
  60
  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  STDIO_PROTO((rtx, FILE *, int));
  65
  66 /* Output assembler code for some insns: all or part of a function.  */
  67 extern void final               STDIO_PROTO((rtx, FILE *, int, int));
  68
  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
  71    be scanned.  */
  72 extern rtx final_scan_insn      STDIO_PROTO((rtx, FILE *, int, int, int));
  73
  74 /* Replace a SUBREG with a REG or a MEM, based on the thing it is a
  75    subreg of.  */
  76 extern rtx alter_subreg PROTO((rtx));
  77
  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((char *));
  81
  82 /* Output a string of assembler code, substituting insn operands.
  83    Defined in final.c.  */
  84 extern void output_asm_insn     PROTO((char *, rtx *));
  85
  86 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol.  */
  87 extern void output_asm_label    PROTO((rtx));
  88
  89 /* Print a memory reference operand for address X
  90    using machine-dependent assembler syntax.  */
  91 extern void output_address      PROTO((rtx));
  92
  93 /* Print an integer constant expression in assembler syntax.
  94    Addition and subtraction are the only arithmetic
  95    that may appear in these expressions.  */
  96 extern void output_addr_const STDIO_PROTO((FILE *, rtx));
  97
  98 /* Output a string of assembler code, substituting numbers, strings
  99    and fixed syntactic prefixes.  */
 100 extern void asm_fprintf         STDIO_PROTO(PVPROTO((FILE *file,
 101                                                      char *p, ...)));
 102
 103 /* Split up a CONST_DOUBLE or integer constant rtx into two rtx's for single
 104    words.  */
 105 extern void split_double        PROTO((rtx, rtx *, rtx *));
 106
 107 /* Return nonzero if this function has no function calls.  */
 108 extern int leaf_function_p      PROTO((void));
 109
 110 /* Return 1 if this function uses only the registers that can be
 111    safely renumbered.  */
 112 extern int only_leaf_regs_used  PROTO((void));
 113
 114 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
 115    available in leaf functions.  */
 116 extern void leaf_renumber_regs_insn PROTO((rtx));
 117 #endif
 118
 119 /* Functions in varasm.c.  */
 120
 121 /* Tell assembler to switch to text section.  */
 122 extern void text_section                PROTO((void));
 123
 124 /* Tell assembler to switch to data section.  */
 125 extern void data_section                PROTO((void));
 126
 127 /* Tell assembler to switch to read-only data section.  This is normally
 128    the text section.  */
 129 extern void readonly_data_section       PROTO((void));
 130
 131 /* Determine if we're in the text section. */
 132 extern int in_text_section              PROTO((void));
 133
 134 #ifdef TREE_CODE
 135 /* Tell assembler to change to section NAME for DECL.
 136    If DECL is NULL, just switch to section NAME.
 137    If NAME is NULL, get the name from DECL.  */
 138 extern void named_section               PROTO((tree, char *));
 139
 140 /* Tell assembler to switch to the section for function DECL.  */
 141 extern void function_section            PROTO((tree));
 142
 143 /* Create the rtl to represent a function, for a function definition.
 144    DECL is a FUNCTION_DECL node which describes which function.
 145    The rtl is stored into DECL.  */
 146 extern void make_function_rtl           PROTO((tree));
 147
 148 /* Decode an `asm' spec for a declaration as a register name.
 149    Return the register number, or -1 if nothing specified,
 150    or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
 151    or -3 if ASMSPEC is `cc' and is not recognized,
 152    or -4 if ASMSPEC is `memory' and is not recognized.
 153    Accept an exact spelling or a decimal number.
 154    Prefixes such as % are optional.  */
 155 extern int decode_reg_name              PROTO((char *));
 156
 157 /* Create the DECL_RTL for a declaration for a static or external variable
 158    or static or external function.
 159    ASMSPEC, if not 0, is the string which the user specified
 160    as the assembler symbol name.
 161    TOP_LEVEL is nonzero if this is a file-scope variable.
 162
 163    This is never called for PARM_DECL nodes.  */
 164 extern void make_decl_rtl               PROTO((tree, char *, int));
 165
 166 /* Make the rtl for variable VAR be volatile.
 167    Use this only for static variables.  */
 168 extern void make_var_volatile           PROTO((tree));
 169
 170 /* Output alignment directive to align for constant expression EXP.  */
 171 extern void assemble_constant_align     PROTO((tree));
 172
 173 /* Output a string of literal assembler code
 174    for an `asm' keyword used between functions.  */
 175 extern void assemble_asm                PROTO((tree));
 176
 177 /* Record an element in the table of global destructors.
 178    How this is done depends on what sort of assembler and linker
 179    are in use.
 180
 181    NAME should be the name of a global function to be called
 182    at exit time.  This name is output using assemble_name.  */
 183 extern void assemble_destructor         PROTO((char *));
 184
 185 /* Likewise for global constructors.  */
 186 extern void assemble_constructor        PROTO((char *));
 187
 188 /* Likewise for entries we want to record for garbage collection.
 189    Garbage collection is still under development.  */
 190 extern void assemble_gc_entry           PROTO((char *));
 191
 192 /* Output assembler code for the constant pool of a function and associated
 193    with defining the name of the function.  DECL describes the function.
 194    NAME is the function's name.  For the constant pool, we use the current
 195    constant pool data.  */
 196 extern void assemble_start_function     PROTO((tree, char *));
 197
 198 /* Output assembler code associated with defining the size of the
 199    function.  DECL describes the function.  NAME is the function's name.  */
 200 extern void assemble_end_function       PROTO((tree, char *));
 201
 202 /* Assemble code to leave SIZE bytes of zeros.  */
 203 extern void assemble_zeros              PROTO((int));
 204
 205 /* Assemble an alignment pseudo op for an ALIGN-bit boundary.  */
 206 extern void assemble_align              PROTO((int));
 207
 208 /* Assemble a string constant with the specified C string as contents.  */
 209 extern void assemble_string             PROTO((char *, int));
 210 /* Assemble everything that is needed for a variable or function declaration.
 211    Not used for automatic variables, and not used for function definitions.
 212    Should not be called for variables of incomplete structure type.
 213
 214    TOP_LEVEL is nonzero if this variable has file scope.
 215    AT_END is nonzero if this is the special handling, at end of compilation,
 216    to define things that have had only tentative definitions.
 217    DONT_OUTPUT_DATA if nonzero means don't actually output the
 218    initial value (that will be done by the caller).  */
 219 extern void assemble_variable           PROTO((tree, int, int, int));
 220
 221 /* Output text storage for constructor CONSTR. */
 222 extern void bc_output_constructor       PROTO((tree, int));
 223
 224 /* Create storage for constructor CONSTR. */
 225 extern void bc_output_data_constructor  PROTO((tree));
 226
 227 /* Output something to declare an external symbol to the assembler.
 228    (Most assemblers don't need this, so we normally output nothing.)
 229    Do nothing if DECL is not external.  */
 230 extern void assemble_external           PROTO((tree));
 231 #endif
 232
 233 #ifdef RTX_CODE
 234 /* Similar, for calling a library function FUN.  */
 235 extern void assemble_external_libcall   PROTO((rtx));
 236 #endif
 237
 238 /* Declare the label NAME global.  */
 239 extern void assemble_global             PROTO((char *));
 240
 241 /* Assemble a label named NAME.  */
 242 extern void assemble_label              PROTO((char *));
 243
 244 /* Output to FILE a reference to the assembler name of a C-level name NAME.
 245    If NAME starts with a *, the rest of NAME is output verbatim.
 246    Otherwise NAME is transformed in an implementation-defined way
 247    (usually by the addition of an underscore).
 248    Many macros in the tm file are defined to call this function.  */
 249 extern void assemble_name               STDIO_PROTO((FILE *, char *));
 250
 251 #ifdef RTX_CODE
 252 /* Assemble the integer constant X into an object of SIZE bytes.
 253    X must be either a CONST_INT or CONST_DOUBLE.
 254
 255    Return 1 if we were able to output the constant, otherwise 0.  If FORCE is
 256    non-zero, abort if we can't output the constant.  */
 257 extern int assemble_integer             PROTO((rtx, int, int));
 258
 259 #ifdef EMUSHORT
 260 /* Assemble the floating-point constant D into an object of size MODE.  */
 261 extern void assemble_real               PROTO((REAL_VALUE_TYPE,
 262                                                enum machine_mode));
 263 #endif
 264 #endif
 265
 266 /* At the end of a function, forget the memory-constants
 267    previously made for CONST_DOUBLEs.  Mark them as not on real_constant_chain.
 268    Also clear out real_constant_chain and clear out all the chain-pointers.  */
 269 extern void clear_const_double_mem      PROTO((void));
 270
 271 /* Start deferring output of subconstants.  */
 272 extern void defer_addressed_constants   PROTO((void));
 273
 274 /* Stop deferring output of subconstants,
 275    and output now all those that have been deferred.  */
 276 extern void output_deferred_addressed_constants PROTO((void));
 277
 278 /* Initialize constant pool hashing for next function.  */
 279 extern void init_const_rtx_hash_table   PROTO((void));
 280
 281 /* Return the size of the constant pool.  */
 282 extern int get_pool_size                PROTO((void));
 283
 284 #ifdef TREE_CODE
 285 /* Write all the constants in the constant pool.  */
 286 extern void output_constant_pool        PROTO((char *, tree));
 287
 288 /* Output assembler code for constant EXP to FILE, with no label.
 289    This includes the pseudo-op such as ".int" or ".byte", and a newline.
 290    Assumes output_addressed_constants has been done on EXP already.
 291
 292    Generate exactly SIZE bytes of assembler data, padding at the end
 293    with zeros if necessary.  SIZE must always be specified.  */
 294 extern void output_constant             PROTO((tree, int));
 295 #endif
 296
 297 /* When outputting assembler code, indicates which alternative
 298    of the constraints was actually satisfied.  */
 299 extern int which_alternative;
 300
 301 #ifdef RTX_CODE
 302 /* When outputting delayed branch sequences, this rtx holds the
 303    sequence being output.  It is null when no delayed branch
 304    sequence is being output, so it can be used as a test in the
 305    insn output code.
 306
 307    This variable is defined  in final.c.  */
 308 extern rtx final_sequence;
 309 #endif
 310
 311 /* Number of bytes of args popped by function being compiled on its return.
 312    Zero if no bytes are to be popped.
 313    May affect compilation of return insn or of function epilogue.  */
 314
 315 extern int current_function_pops_args;
 316
 317 /* Nonzero if function being compiled needs to be given an address
 318    where the value should be stored.  */
 319
 320 extern int current_function_returns_struct;
 321
 322 /* Nonzero if function being compiled needs to
 323    return the address of where it has put a structure value.  */
 324
 325 extern int current_function_returns_pcc_struct;
 326
 327 /* Nonzero if function being compiled needs to be passed a static chain.  */
 328
 329 extern int current_function_needs_context;
 330
 331 /* Nonzero if function being compiled can call setjmp.  */
 332
 333 extern int current_function_calls_setjmp;
 334
 335 /* Nonzero if function being compiled can call longjmp.  */
 336
 337 extern int current_function_calls_longjmp;
 338
 339 /* Nonzero if function being compiled can call alloca,
 340    either as a subroutine or builtin.  */
 341
 342 extern int current_function_calls_alloca;
 343
 344 /* Nonzero if function being compiled receives nonlocal gotos
 345    from nested functions.  */
 346
 347 extern int current_function_has_nonlocal_label;
 348
 349 /* Nonzero if function being compiled contains nested functions.  */
 350
 351 extern int current_function_contains_functions;
 352
 353 /* Nonzero if the current function returns a pointer type */
 354
 355 extern int current_function_returns_pointer;
 356
 357 /* If function's args have a fixed size, this is that size, in bytes.
 358    Otherwise, it is -1.
 359    May affect compilation of return insn or of function epilogue.  */
 360
 361 extern int current_function_args_size;
 362
 363 /* # bytes the prologue should push and pretend that the caller pushed them.
 364    The prologue must do this, but only if parms can be passed in registers.  */
 365
 366 extern int current_function_pretend_args_size;
 367
 368 /* # of bytes of outgoing arguments required to be pushed by the prologue.
 369    If this is non-zero, it means that ACCUMULATE_OUTGOING_ARGS was defined
 370    and no stack adjusts will be done on function calls.  */
 371
 372 extern int current_function_outgoing_args_size;
 373
 374 /* Nonzero if current function uses varargs.h or equivalent.
 375    Zero for functions that use stdarg.h.  */
 376
 377 extern int current_function_varargs;
 378
 379 /* Nonzero if current function uses stdarg.h or equivalent.
 380    Zero for functions that use varargs.h.  */
 381
 382 extern int current_function_stdarg;
 383
 384 /* Quantities of various kinds of registers
 385    used for the current function's args.  */
 386
 387 extern CUMULATIVE_ARGS current_function_args_info;
 388
 389 /* Name of function now being compiled.  */
 390
 391 extern char *current_function_name;
 392
 393 #ifdef RTX_CODE
 394 /* If non-zero, an RTL expression for that location at which the current
 395    function returns its result.  Usually equal to
 396    DECL_RTL (DECL_RESULT (current_function_decl)).  */
 397
 398 extern rtx current_function_return_rtx;
 399
 400 /* If some insns can be deferred to the delay slots of the epilogue, the
 401    delay list for them is recorded here.  */
 402
 403 extern rtx current_function_epilogue_delay_list;
 404 #endif
 405
 406 /* Nonzero means generate position-independent code.
 407    This is not fully implemented yet.  */
 408
 409 extern int flag_pic;
 410
 411 /* This is nonzero if the current function uses pic_offset_table_rtx.  */
 412 extern int current_function_uses_pic_offset_table;
 413
 414 /* This is nonzero if the current function uses the constant pool.  */
 415 extern int current_function_uses_const_pool;
 416
 417 /* The line number of the beginning of the current function.
 418    sdbout.c needs this so that it can output relative linenumbers.  */
 419
 420 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers.  */
 421 extern int sdb_begin_function_line;
 422 #endif
 423
 424 /* File in which assembler code is being written.  */
 425
 426 #ifdef BUFSIZ
 427 extern FILE *asm_out_file;
 428 #endif