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, 1997 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
 118 /* Functions in flow.c */
 119 extern void allocate_for_life_analysis  PROTO((void));
 120 extern int regno_uninitialized          PROTO((int));
 121 extern int regno_clobbered_at_setjmp    PROTO((int));
 122 extern void dump_flow_info              STDIO_PROTO((FILE *));
 123 extern void flow_analysis               STDIO_PROTO((rtx, int, FILE *));
 124 #endif
 125
 126 /* Functions in varasm.c.  */
 127
 128 /* Tell assembler to switch to text section.  */
 129 extern void text_section                PROTO((void));
 130
 131 /* Tell assembler to switch to data section.  */
 132 extern void data_section                PROTO((void));
 133
 134 /* Tell assembler to switch to read-only data section.  This is normally
 135    the text section.  */
 136 extern void readonly_data_section       PROTO((void));
 137
 138 /* Determine if we're in the text section. */
 139 extern int in_text_section              PROTO((void));
 140
 141 #ifdef TREE_CODE
 142 /* Tell assembler to change to section NAME for DECL.
 143    If DECL is NULL, just switch to section NAME.
 144    If NAME is NULL, get the name from DECL.
 145    If RELOC is 1, the initializer for DECL contains relocs.  */
 146 extern void named_section               PROTO((tree, char *, int));
 147
 148 /* Tell assembler to switch to the section for function DECL.  */
 149 extern void function_section            PROTO((tree));
 150
 151 /* Tell assembler to switch to the section for the exception table.  */
 152 extern void exception_section           PROTO((void));
 153
 154 /* Create the rtl to represent a function, for a function definition.
 155    DECL is a FUNCTION_DECL node which describes which function.
 156    The rtl is stored into DECL.  */
 157 extern void make_function_rtl           PROTO((tree));
 158
 159 /* Decode an `asm' spec for a declaration as a register name.
 160    Return the register number, or -1 if nothing specified,
 161    or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
 162    or -3 if ASMSPEC is `cc' and is not recognized,
 163    or -4 if ASMSPEC is `memory' and is not recognized.
 164    Accept an exact spelling or a decimal number.
 165    Prefixes such as % are optional.  */
 166 extern int decode_reg_name              PROTO((char *));
 167
 168 /* Create the DECL_RTL for a declaration for a static or external variable
 169    or static or external function.
 170    ASMSPEC, if not 0, is the string which the user specified
 171    as the assembler symbol name.
 172    TOP_LEVEL is nonzero if this is a file-scope variable.
 173
 174    This is never called for PARM_DECL nodes.  */
 175 extern void make_decl_rtl               PROTO((tree, char *, int));
 176
 177 /* Make the rtl for variable VAR be volatile.
 178    Use this only for static variables.  */
 179 extern void make_var_volatile           PROTO((tree));
 180
 181 /* Output alignment directive to align for constant expression EXP.  */
 182 extern void assemble_constant_align     PROTO((tree));
 183
 184 /* Output a string of literal assembler code
 185    for an `asm' keyword used between functions.  */
 186 extern void assemble_asm                PROTO((tree));
 187
 188 /* Record an element in the table of global destructors.
 189    How this is done depends on what sort of assembler and linker
 190    are in use.
 191
 192    NAME should be the name of a global function to be called
 193    at exit time.  This name is output using assemble_name.  */
 194 extern void assemble_destructor         PROTO((char *));
 195
 196 /* Likewise for global constructors.  */
 197 extern void assemble_constructor        PROTO((char *));
 198
 199 /* Likewise for entries we want to record for garbage collection.
 200    Garbage collection is still under development.  */
 201 extern void assemble_gc_entry           PROTO((char *));
 202
 203 /* Output assembler code for the constant pool of a function and associated
 204    with defining the name of the function.  DECL describes the function.
 205    NAME is the function's name.  For the constant pool, we use the current
 206    constant pool data.  */
 207 extern void assemble_start_function     PROTO((tree, char *));
 208
 209 /* Output assembler code associated with defining the size of the
 210    function.  DECL describes the function.  NAME is the function's name.  */
 211 extern void assemble_end_function       PROTO((tree, char *));
 212
 213 /* Assemble code to leave SIZE bytes of zeros.  */
 214 extern void assemble_zeros              PROTO((int));
 215
 216 /* Assemble an alignment pseudo op for an ALIGN-bit boundary.  */
 217 extern void assemble_align              PROTO((int));
 218
 219 /* Assemble a string constant with the specified C string as contents.  */
 220 extern void assemble_string             PROTO((char *, int));
 221 /* Assemble everything that is needed for a variable or function declaration.
 222    Not used for automatic variables, and not used for function definitions.
 223    Should not be called for variables of incomplete structure type.
 224
 225    TOP_LEVEL is nonzero if this variable has file scope.
 226    AT_END is nonzero if this is the special handling, at end of compilation,
 227    to define things that have had only tentative definitions.
 228    DONT_OUTPUT_DATA if nonzero means don't actually output the
 229    initial value (that will be done by the caller).  */
 230 extern void assemble_variable           PROTO((tree, int, int, int));
 231
 232 /* Output text storage for constructor CONSTR. */
 233 extern void bc_output_constructor       PROTO((tree, int));
 234
 235 /* Create storage for constructor CONSTR. */
 236 extern void bc_output_data_constructor  PROTO((tree));
 237
 238 /* Output something to declare an external symbol to the assembler.
 239    (Most assemblers don't need this, so we normally output nothing.)
 240    Do nothing if DECL is not external.  */
 241 extern void assemble_external           PROTO((tree));
 242 #endif
 243
 244 #ifdef RTX_CODE
 245 /* Similar, for calling a library function FUN.  */
 246 extern void assemble_external_libcall   PROTO((rtx));
 247 #endif
 248
 249 /* Declare the label NAME global.  */
 250 extern void assemble_global             PROTO((char *));
 251
 252 /* Assemble a label named NAME.  */
 253 extern void assemble_label              PROTO((char *));
 254
 255 /* Output to FILE a reference to the assembler name of a C-level name NAME.
 256    If NAME starts with a *, the rest of NAME is output verbatim.
 257    Otherwise NAME is transformed in an implementation-defined way
 258    (usually by the addition of an underscore).
 259    Many macros in the tm file are defined to call this function.  */
 260 extern void assemble_name               STDIO_PROTO((FILE *, char *));
 261
 262 #ifdef RTX_CODE
 263 /* Assemble the integer constant X into an object of SIZE bytes.
 264    X must be either a CONST_INT or CONST_DOUBLE.
 265
 266    Return 1 if we were able to output the constant, otherwise 0.  If FORCE is
 267    non-zero, abort if we can't output the constant.  */
 268 extern int assemble_integer             PROTO((rtx, int, int));
 269
 270 #ifdef EMUSHORT
 271 /* Assemble the floating-point constant D into an object of size MODE.  */
 272 extern void assemble_real               PROTO((REAL_VALUE_TYPE,
 273                                                enum machine_mode));
 274 #endif
 275 #endif
 276
 277 /* At the end of a function, forget the memory-constants
 278    previously made for CONST_DOUBLEs.  Mark them as not on real_constant_chain.
 279    Also clear out real_constant_chain and clear out all the chain-pointers.  */
 280 extern void clear_const_double_mem      PROTO((void));
 281
 282 /* Start deferring output of subconstants.  */
 283 extern void defer_addressed_constants   PROTO((void));
 284
 285 /* Stop deferring output of subconstants,
 286    and output now all those that have been deferred.  */
 287 extern void output_deferred_addressed_constants PROTO((void));
 288
 289 /* Initialize constant pool hashing for next function.  */
 290 extern void init_const_rtx_hash_table   PROTO((void));
 291
 292 /* Return the size of the constant pool.  */
 293 extern int get_pool_size                PROTO((void));
 294
 295 #ifdef TREE_CODE
 296 /* Write all the constants in the constant pool.  */
 297 extern void output_constant_pool        PROTO((char *, tree));
 298
 299 /* Output assembler code for constant EXP to FILE, with no label.
 300    This includes the pseudo-op such as ".int" or ".byte", and a newline.
 301    Assumes output_addressed_constants has been done on EXP already.
 302
 303    Generate exactly SIZE bytes of assembler data, padding at the end
 304    with zeros if necessary.  SIZE must always be specified.  */
 305 extern void output_constant             PROTO((tree, int));
 306 #endif
 307
 308 /* When outputting assembler code, indicates which alternative
 309    of the constraints was actually satisfied.  */
 310 extern int which_alternative;
 311
 312 #ifdef RTX_CODE
 313 /* When outputting delayed branch sequences, this rtx holds the
 314    sequence being output.  It is null when no delayed branch
 315    sequence is being output, so it can be used as a test in the
 316    insn output code.
 317
 318    This variable is defined  in final.c.  */
 319 extern rtx final_sequence;
 320 #endif
 321
 322 /* Number of bytes of args popped by function being compiled on its return.
 323    Zero if no bytes are to be popped.
 324    May affect compilation of return insn or of function epilogue.  */
 325
 326 extern int current_function_pops_args;
 327
 328 /* Nonzero if function being compiled needs to be given an address
 329    where the value should be stored.  */
 330
 331 extern int current_function_returns_struct;
 332
 333 /* Nonzero if function being compiled needs to
 334    return the address of where it has put a structure value.  */
 335
 336 extern int current_function_returns_pcc_struct;
 337
 338 /* Nonzero if function being compiled needs to be passed a static chain.  */
 339
 340 extern int current_function_needs_context;
 341
 342 /* Nonzero if function being compiled can call setjmp.  */
 343
 344 extern int current_function_calls_setjmp;
 345
 346 /* Nonzero if function being compiled can call longjmp.  */
 347
 348 extern int current_function_calls_longjmp;
 349
 350 /* Nonzero if function being compiled can call alloca,
 351    either as a subroutine or builtin.  */
 352
 353 extern int current_function_calls_alloca;
 354
 355 /* Nonzero if function being compiled receives nonlocal gotos
 356    from nested functions.  */
 357
 358 extern int current_function_has_nonlocal_label;
 359
 360 /* Nonzero if function being compiled contains nested functions.  */
 361
 362 extern int current_function_contains_functions;
 363
 364 /* Nonzero if the current function returns a pointer type */
 365
 366 extern int current_function_returns_pointer;
 367
 368 /* If function's args have a fixed size, this is that size, in bytes.
 369    Otherwise, it is -1.
 370    May affect compilation of return insn or of function epilogue.  */
 371
 372 extern int current_function_args_size;
 373
 374 /* # bytes the prologue should push and pretend that the caller pushed them.
 375    The prologue must do this, but only if parms can be passed in registers.  */
 376
 377 extern int current_function_pretend_args_size;
 378
 379 /* # of bytes of outgoing arguments required to be pushed by the prologue.
 380    If this is non-zero, it means that ACCUMULATE_OUTGOING_ARGS was defined
 381    and no stack adjusts will be done on function calls.  */
 382
 383 extern int current_function_outgoing_args_size;
 384
 385 /* Nonzero if current function uses varargs.h or equivalent.
 386    Zero for functions that use stdarg.h.  */
 387
 388 extern int current_function_varargs;
 389
 390 /* Nonzero if current function uses stdarg.h or equivalent.
 391    Zero for functions that use varargs.h.  */
 392
 393 extern int current_function_stdarg;
 394
 395 /* Quantities of various kinds of registers
 396    used for the current function's args.  */
 397
 398 extern CUMULATIVE_ARGS current_function_args_info;
 399
 400 /* Name of function now being compiled.  */
 401
 402 extern char *current_function_name;
 403
 404 #ifdef RTX_CODE
 405 /* If non-zero, an RTL expression for that location at which the current
 406    function returns its result.  Usually equal to
 407    DECL_RTL (DECL_RESULT (current_function_decl)).  */
 408
 409 extern rtx current_function_return_rtx;
 410
 411 /* If some insns can be deferred to the delay slots of the epilogue, the
 412    delay list for them is recorded here.  */
 413
 414 extern rtx current_function_epilogue_delay_list;
 415 #endif
 416
 417 /* Nonzero means generate position-independent code.
 418    This is not fully implemented yet.  */
 419
 420 extern int flag_pic;
 421
 422 /* This is nonzero if the current function uses pic_offset_table_rtx.  */
 423 extern int current_function_uses_pic_offset_table;
 424
 425 /* This is nonzero if the current function uses the constant pool.  */
 426 extern int current_function_uses_const_pool;
 427
 428 /* The line number of the beginning of the current function.
 429    sdbout.c needs this so that it can output relative linenumbers.  */
 430
 431 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers.  */
 432 extern int sdb_begin_function_line;
 433 #endif
 434
 435 /* File in which assembler code is being written.  */
 436
 437 #ifdef BUFSIZ
 438 extern FILE *asm_out_file;
 439 #endif
 440
 441 /* Decide whether DECL needs to be in a writable section.  RELOC is the same
 442    as for SELECT_SECTION.  */
 443
 444 #define DECL_READONLY_SECTION(DECL,RELOC)               \
 445   (TREE_READONLY (DECL)                                 \
 446    && ! TREE_THIS_VOLATILE (DECL)                       \
 447    && DECL_INITIAL (DECL)                               \
 448    && (DECL_INITIAL (DECL) == error_mark_node           \
 449        || TREE_CONSTANT (DECL_INITIAL (DECL)))          \
 450    && ! (RELOC && (flag_pic || DECL_ONE_ONLY (DECL))))