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, 97-98, 1999 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((const 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  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  PROTO((rtx, FILE *, int));
  65
  66 /* Output assembler code for some insns: all or part of a function.  */
  67 extern void final               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      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((const 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 /* 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));
  90
  91 /* Find the alignment associated with a CODE_LABEL.
  92    Defined in final.c.  */
  93 extern int label_to_alignment   PROTO((rtx));
  94
  95 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol.  */
  96 extern void output_asm_label    PROTO((rtx));
  97
  98 /* Print a memory reference operand for address X
  99    using machine-dependent assembler syntax.  */
 100 extern void output_address      PROTO((rtx));
 101
 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));
 106
 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, ...));
 110
 111 /* Split up a CONST_DOUBLE or integer constant rtx into two rtx's for single
 112    words.  */
 113 extern void split_double        PROTO((rtx, rtx *, rtx *));
 114
 115 /* Return nonzero if this function has no function calls.  */
 116 extern int leaf_function_p      PROTO((void));
 117
 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));
 121
 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));
 125
 126 /* Functions in flow.c */
 127 extern void allocate_for_life_analysis  PROTO((void));
 128 extern int regno_uninitialized          PROTO((int));
 129 extern int regno_clobbered_at_setjmp    PROTO((int));
 130 extern void dump_flow_info              PROTO((FILE *));
 131 extern void find_basic_blocks         PROTO((rtx, int, FILE *));
 132 extern void free_basic_block_vars     PROTO((int));
 133 extern void set_block_num             PROTO((rtx, int));
 134 extern void life_analysis             PROTO((rtx, int, FILE *));
 135 #endif
 136
 137 /* Functions in varasm.c.  */
 138
 139 /* Tell assembler to switch to text section.  */
 140 extern void text_section                PROTO((void));
 141
 142 /* Tell assembler to switch to data section.  */
 143 extern void data_section                PROTO((void));
 144
 145 /* Tell assembler to make sure its in the data section.  */
 146 extern void force_data_section          PROTO((void));
 147
 148 /* Tell assembler to switch to read-only data section.  This is normally
 149    the text section.  */
 150 extern void readonly_data_section       PROTO((void));
 151
 152 /* Determine if we're in the text section. */
 153 extern int in_text_section              PROTO((void));
 154
 155 #ifdef EH_FRAME_SECTION_ASM_OP
 156 extern void eh_frame_section            PROTO ((void));
 157 #endif
 158
 159 #ifdef TREE_CODE
 160 /* Tell assembler to change to section NAME for DECL.
 161    If DECL is NULL, just switch to section NAME.
 162    If NAME is NULL, get the name from DECL.
 163    If RELOC is 1, the initializer for DECL contains relocs.  */
 164 extern void named_section               PROTO((tree, const char *, int));
 165
 166 /* Tell assembler to switch to the section for function DECL.  */
 167 extern void function_section            PROTO((tree));
 168
 169 /* Tell assembler to switch to the section for the exception table.  */
 170 extern void exception_section           PROTO((void));
 171
 172 /* Create the rtl to represent a function, for a function definition.
 173    DECL is a FUNCTION_DECL node which describes which function.
 174    The rtl is stored into DECL.  */
 175 extern void make_function_rtl           PROTO((tree));
 176
 177 /* Declare DECL to be a weak symbol.  */
 178 extern void declare_weak                PROTO ((tree));
 179 #endif /* TREE_CODE */
 180
 181 /* Emit any pending weak declarations.  */
 182 extern void weak_finish                 PROTO ((void));
 183
 184 /* Decode an `asm' spec for a declaration as a register name.
 185    Return the register number, or -1 if nothing specified,
 186    or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
 187    or -3 if ASMSPEC is `cc' and is not recognized,
 188    or -4 if ASMSPEC is `memory' and is not recognized.
 189    Accept an exact spelling or a decimal number.
 190    Prefixes such as % are optional.  */
 191 extern int decode_reg_name              PROTO((const char *));
 192
 193 #ifdef TREE_CODE
 194 /* Create the DECL_RTL for a declaration for a static or external variable
 195    or static or external function.
 196    ASMSPEC, if not 0, is the string which the user specified
 197    as the assembler symbol name.
 198    TOP_LEVEL is nonzero if this is a file-scope variable.
 199
 200    This is never called for PARM_DECL nodes.  */
 201 extern void make_decl_rtl               PROTO((tree, const char *, int));
 202
 203 /* Make the rtl for variable VAR be volatile.
 204    Use this only for static variables.  */
 205 extern void make_var_volatile           PROTO((tree));
 206
 207 /* Output alignment directive to align for constant expression EXP.  */
 208 extern void assemble_constant_align     PROTO((tree));
 209
 210 extern void assemble_alias              PROTO((tree, tree));
 211
 212 /* Output a string of literal assembler code
 213    for an `asm' keyword used between functions.  */
 214 extern void assemble_asm                PROTO((tree));
 215
 216 /* Record an element in the table of global destructors.
 217    How this is done depends on what sort of assembler and linker
 218    are in use.
 219
 220    NAME should be the name of a global function to be called
 221    at exit time.  This name is output using assemble_name.  */
 222 extern void assemble_destructor         PROTO((char *));
 223
 224 /* Likewise for global constructors.  */
 225 extern void assemble_constructor        PROTO((char *));
 226
 227 /* Likewise for entries we want to record for garbage collection.
 228    Garbage collection is still under development.  */
 229 extern void assemble_gc_entry           PROTO((char *));
 230
 231 /* Output assembler code for the constant pool of a function and associated
 232    with defining the name of the function.  DECL describes the function.
 233    NAME is the function's name.  For the constant pool, we use the current
 234    constant pool data.  */
 235 extern void assemble_start_function     PROTO((tree, char *));
 236
 237 /* Output assembler code associated with defining the size of the
 238    function.  DECL describes the function.  NAME is the function's name.  */
 239 extern void assemble_end_function       PROTO((tree, char *));
 240
 241 /* Assemble code to leave SIZE bytes of zeros.  */
 242 extern void assemble_zeros              PROTO((int));
 243
 244 /* Assemble an alignment pseudo op for an ALIGN-bit boundary.  */
 245 extern void assemble_align              PROTO((int));
 246
 247 /* Assemble a string constant with the specified C string as contents.  */
 248 extern void assemble_string             PROTO((char *, int));
 249 /* Assemble everything that is needed for a variable or function declaration.
 250    Not used for automatic variables, and not used for function definitions.
 251    Should not be called for variables of incomplete structure type.
 252
 253    TOP_LEVEL is nonzero if this variable has file scope.
 254    AT_END is nonzero if this is the special handling, at end of compilation,
 255    to define things that have had only tentative definitions.
 256    DONT_OUTPUT_DATA if nonzero means don't actually output the
 257    initial value (that will be done by the caller).  */
 258 extern void assemble_variable           PROTO((tree, int, int, int));
 259
 260 /* Output something to declare an external symbol to the assembler.
 261    (Most assemblers don't need this, so we normally output nothing.)
 262    Do nothing if DECL is not external.  */
 263 extern void assemble_external           PROTO((tree));
 264 #endif /* TREE_CODE */
 265
 266 #ifdef RTX_CODE
 267 /* Similar, for calling a library function FUN.  */
 268 extern void assemble_external_libcall   PROTO((rtx));
 269 #endif
 270
 271 /* Declare the label NAME global.  */
 272 extern void assemble_global             PROTO((char *));
 273
 274 /* Assemble a label named NAME.  */
 275 extern void assemble_label              PROTO((char *));
 276
 277 /* Output to FILE a reference to the assembler name of a C-level name NAME.
 278    If NAME starts with a *, the rest of NAME is output verbatim.
 279    Otherwise NAME is transformed in an implementation-defined way
 280    (usually by the addition of an underscore).
 281    Many macros in the tm file are defined to call this function.  */
 282 extern void assemble_name               PROTO((FILE *, char *));
 283
 284 #ifdef RTX_CODE
 285 /* Assemble the integer constant X into an object of SIZE bytes.
 286    X must be either a CONST_INT or CONST_DOUBLE.
 287
 288    Return 1 if we were able to output the constant, otherwise 0.  If FORCE is
 289    non-zero, abort if we can't output the constant.  */
 290 extern int assemble_integer             PROTO((rtx, int, int));
 291
 292 #ifdef EMUSHORT
 293 /* Assemble the floating-point constant D into an object of size MODE.  */
 294 extern void assemble_real               PROTO((REAL_VALUE_TYPE,
 295                                                enum machine_mode));
 296 #endif
 297 #endif
 298
 299 /* At the end of a function, forget the memory-constants
 300    previously made for CONST_DOUBLEs.  Mark them as not on real_constant_chain.
 301    Also clear out real_constant_chain and clear out all the chain-pointers.  */
 302 extern void clear_const_double_mem      PROTO((void));
 303
 304 /* Start deferring output of subconstants.  */
 305 extern void defer_addressed_constants   PROTO((void));
 306
 307 /* Stop deferring output of subconstants,
 308    and output now all those that have been deferred.  */
 309 extern void output_deferred_addressed_constants PROTO((void));
 310
 311 /* Initialize constant pool hashing for next function.  */
 312 extern void init_const_rtx_hash_table   PROTO((void));
 313
 314 /* Return the size of the constant pool.  */
 315 extern int get_pool_size                PROTO((void));
 316
 317 #ifdef TREE_CODE
 318 /* Write all the constants in the constant pool.  */
 319 extern void output_constant_pool        PROTO((char *, tree));
 320
 321 /* Output assembler code for constant EXP to FILE, with no label.
 322    This includes the pseudo-op such as ".int" or ".byte", and a newline.
 323    Assumes output_addressed_constants has been done on EXP already.
 324
 325    Generate exactly SIZE bytes of assembler data, padding at the end
 326    with zeros if necessary.  SIZE must always be specified.  */
 327 extern void output_constant             PROTO((tree, int));
 328 #endif
 329
 330 /* When outputting assembler code, indicates which alternative
 331    of the constraints was actually satisfied.  */
 332 extern int which_alternative;
 333
 334 #ifdef RTX_CODE
 335 /* When outputting delayed branch sequences, this rtx holds the
 336    sequence being output.  It is null when no delayed branch
 337    sequence is being output, so it can be used as a test in the
 338    insn output code.
 339
 340    This variable is defined  in final.c.  */
 341 extern rtx final_sequence;
 342 #endif
 343
 344 /* Number of bytes of args popped by function being compiled on its return.
 345    Zero if no bytes are to be popped.
 346    May affect compilation of return insn or of function epilogue.  */
 347
 348 extern int current_function_pops_args;
 349
 350 /* Nonzero if function being compiled needs to be given an address
 351    where the value should be stored.  */
 352
 353 extern int current_function_returns_struct;
 354
 355 /* Nonzero if function being compiled needs to
 356    return the address of where it has put a structure value.  */
 357
 358 extern int current_function_returns_pcc_struct;
 359
 360 /* Nonzero if function being compiled needs to be passed a static chain.  */
 361
 362 extern int current_function_needs_context;
 363
 364 /* Nonzero if function being compiled can call setjmp.  */
 365
 366 extern int current_function_calls_setjmp;
 367
 368 /* Nonzero if function being compiled can call longjmp.  */
 369
 370 extern int current_function_calls_longjmp;
 371
 372 /* Nonzero if function being compiled can call alloca,
 373    either as a subroutine or builtin.  */
 374
 375 extern int current_function_calls_alloca;
 376
 377 /* Nonzero if function being compiled receives nonlocal gotos
 378    from nested functions.  */
 379
 380 extern int current_function_has_nonlocal_label;
 381
 382 /* Nonzero if function being compiled contains nested functions.  */
 383
 384 extern int current_function_contains_functions;
 385
 386 /* Nonzero if function being compiled doesn't modify the stack pointer
 387    (ignoring the prologue and epilogue).  This is only valid after
 388    life_analysis has run. */
 389
 390 extern int current_function_sp_is_unchanging;
 391
 392 /* Nonzero if the current function returns a pointer type */
 393
 394 extern int current_function_returns_pointer;
 395
 396 /* If function's args have a fixed size, this is that size, in bytes.
 397    Otherwise, it is -1.
 398    May affect compilation of return insn or of function epilogue.  */
 399
 400 extern int current_function_args_size;
 401
 402 /* # bytes the prologue should push and pretend that the caller pushed them.
 403    The prologue must do this, but only if parms can be passed in registers.  */
 404
 405 extern int current_function_pretend_args_size;
 406
 407 /* # of bytes of outgoing arguments required to be pushed by the prologue.
 408    If this is non-zero, it means that ACCUMULATE_OUTGOING_ARGS was defined
 409    and no stack adjusts will be done on function calls.  */
 410
 411 extern int current_function_outgoing_args_size;
 412
 413 /* Nonzero if current function uses varargs.h or equivalent.
 414    Zero for functions that use stdarg.h.  */
 415
 416 extern int current_function_varargs;
 417
 418 /* Nonzero if current function uses stdarg.h or equivalent.
 419    Zero for functions that use varargs.h.  */
 420
 421 extern int current_function_stdarg;
 422
 423 /* Quantities of various kinds of registers
 424    used for the current function's args.  */
 425
 426 extern CUMULATIVE_ARGS current_function_args_info;
 427
 428 /* Name of function now being compiled.  */
 429
 430 extern char *current_function_name;
 431
 432 #ifdef RTX_CODE
 433 /* If non-zero, an RTL expression for that location at which the current
 434    function returns its result.  Usually equal to
 435    DECL_RTL (DECL_RESULT (current_function_decl)).  */
 436
 437 extern rtx current_function_return_rtx;
 438
 439 /* If some insns can be deferred to the delay slots of the epilogue, the
 440    delay list for them is recorded here.  */
 441
 442 extern rtx current_function_epilogue_delay_list;
 443 #endif
 444
 445 /* Nonzero means generate position-independent code.
 446    This is not fully implemented yet.  */
 447
 448 extern int flag_pic;
 449
 450 /* This is nonzero if the current function uses pic_offset_table_rtx.  */
 451 extern int current_function_uses_pic_offset_table;
 452
 453 /* This is nonzero if the current function uses the constant pool.  */
 454 extern int current_function_uses_const_pool;
 455
 456 /* Language-specific reason why the current function cannot be made inline.  */
 457 extern char *current_function_cannot_inline;
 458
 459 /* The line number of the beginning of the current function.
 460    sdbout.c needs this so that it can output relative linenumbers.  */
 461
 462 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers.  */
 463 extern int sdb_begin_function_line;
 464 #endif
 465
 466 /* File in which assembler code is being written.  */
 467
 468 #ifdef BUFSIZ
 469 extern FILE *asm_out_file;
 470 #endif
 471
 472 /* Default file in which to dump debug output.  */
 473
 474 #ifdef BUFSIZ
 475 extern FILE *rtl_dump_file;
 476 #endif
 477
 478 /* Decide whether DECL needs to be in a writable section.  RELOC is the same
 479    as for SELECT_SECTION.  */
 480
 481 #define DECL_READONLY_SECTION(DECL,RELOC)               \
 482   (TREE_READONLY (DECL)                                 \
 483    && ! TREE_THIS_VOLATILE (DECL)                       \
 484    && DECL_INITIAL (DECL)                               \
 485    && (DECL_INITIAL (DECL) == error_mark_node           \
 486        || TREE_CONSTANT (DECL_INITIAL (DECL)))          \
 487    && ! (RELOC && (flag_pic || DECL_ONE_ONLY (DECL))))
 488
 489 /* User label prefix in effect for this compilation.  */
 490 extern const char *user_label_prefix;