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