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((const 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((const 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 /* Locate the proper template for the given insn-code.  */
 127 extern const char *get_insn_template PROTO((int, rtx));
 128
 129 /* Functions in flow.c */
 130 extern void allocate_for_life_analysis  PROTO((void));
 131 extern int regno_uninitialized          PROTO((int));
 132 extern int regno_clobbered_at_setjmp    PROTO((int));
 133 extern void dump_flow_info              PROTO((FILE *));
 134 extern void find_basic_blocks         PROTO((rtx, int, FILE *, int));
 135 extern void free_basic_block_vars     PROTO((int));
 136 extern void set_block_num             PROTO((rtx, int));
 137 extern void life_analysis             PROTO((rtx, int, FILE *, int));
 138 #endif
 139
 140 /* Functions in varasm.c.  */
 141
 142 /* Tell assembler to switch to text section.  */
 143 extern void text_section                PROTO((void));
 144
 145 /* Tell assembler to switch to data section.  */
 146 extern void data_section                PROTO((void));
 147
 148 /* Tell assembler to make sure its in the data section.  */
 149 extern void force_data_section          PROTO((void));
 150
 151 /* Tell assembler to switch to read-only data section.  This is normally
 152    the text section.  */
 153 extern void readonly_data_section       PROTO((void));
 154
 155 /* Determine if we're in the text section. */
 156 extern int in_text_section              PROTO((void));
 157
 158 #ifdef EH_FRAME_SECTION_ASM_OP
 159 extern void eh_frame_section            PROTO ((void));
 160 #endif
 161
 162 #ifdef CTORS_SECTION_ASM_OP
 163 extern void ctors_section PARAMS ((void));
 164 #endif
 165
 166 #ifdef DTORS_SECTION_ASM_OP
 167 extern void dtors_section PARAMS ((void));
 168 #endif
 169
 170 #ifdef BSS_SECTION_ASM_OP
 171 extern void bss_section PARAMS ((void));
 172 #endif
 173
 174
 175 #ifdef TREE_CODE
 176 /* Tell assembler to change to section NAME for DECL.
 177    If DECL is NULL, just switch to section NAME.
 178    If NAME is NULL, get the name from DECL.
 179    If RELOC is 1, the initializer for DECL contains relocs.  */
 180 extern void named_section               PROTO((tree, const char *, int));
 181
 182 /* Tell assembler to switch to the section for function DECL.  */
 183 extern void function_section            PROTO((tree));
 184
 185 /* Tell assembler to switch to the section for the exception table.  */
 186 extern void exception_section           PROTO((void));
 187
 188 /* Create the rtl to represent a function, for a function definition.
 189    DECL is a FUNCTION_DECL node which describes which function.
 190    The rtl is stored into DECL.  */
 191 extern void make_function_rtl           PROTO((tree));
 192
 193 /* Declare DECL to be a weak symbol.  */
 194 extern void declare_weak                PROTO ((tree));
 195 #endif /* TREE_CODE */
 196
 197 /* Emit any pending weak declarations.  */
 198 extern void weak_finish                 PROTO ((void));
 199
 200 /* Decode an `asm' spec for a declaration as a register name.
 201    Return the register number, or -1 if nothing specified,
 202    or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
 203    or -3 if ASMSPEC is `cc' and is not recognized,
 204    or -4 if ASMSPEC is `memory' and is not recognized.
 205    Accept an exact spelling or a decimal number.
 206    Prefixes such as % are optional.  */
 207 extern int decode_reg_name              PROTO((const char *));
 208
 209 #ifdef TREE_CODE
 210 /* Create the DECL_RTL for a declaration for a static or external variable
 211    or static or external function.
 212    ASMSPEC, if not 0, is the string which the user specified
 213    as the assembler symbol name.
 214    TOP_LEVEL is nonzero if this is a file-scope variable.
 215
 216    This is never called for PARM_DECL nodes.  */
 217 extern void make_decl_rtl               PROTO((tree, const char *, int));
 218
 219 /* Make the rtl for variable VAR be volatile.
 220    Use this only for static variables.  */
 221 extern void make_var_volatile           PROTO((tree));
 222
 223 /* Output alignment directive to align for constant expression EXP.  */
 224 extern void assemble_constant_align     PROTO((tree));
 225
 226 extern void assemble_alias              PROTO((tree, tree));
 227
 228 /* Output a string of literal assembler code
 229    for an `asm' keyword used between functions.  */
 230 extern void assemble_asm                PROTO((tree));
 231
 232 /* Record an element in the table of global destructors.
 233    How this is done depends on what sort of assembler and linker
 234    are in use.
 235
 236    NAME should be the name of a global function to be called
 237    at exit time.  This name is output using assemble_name.  */
 238 extern void assemble_destructor         PROTO((char *));
 239
 240 /* Likewise for global constructors.  */
 241 extern void assemble_constructor        PROTO((char *));
 242
 243 /* Likewise for entries we want to record for garbage collection.
 244    Garbage collection is still under development.  */
 245 extern void assemble_gc_entry           PROTO((char *));
 246
 247 /* Output assembler code for the constant pool of a function and associated
 248    with defining the name of the function.  DECL describes the function.
 249    NAME is the function's name.  For the constant pool, we use the current
 250    constant pool data.  */
 251 extern void assemble_start_function     PROTO((tree, char *));
 252
 253 /* Output assembler code associated with defining the size of the
 254    function.  DECL describes the function.  NAME is the function's name.  */
 255 extern void assemble_end_function       PROTO((tree, char *));
 256
 257 /* Assemble code to leave SIZE bytes of zeros.  */
 258 extern void assemble_zeros              PROTO((int));
 259
 260 /* Assemble an alignment pseudo op for an ALIGN-bit boundary.  */
 261 extern void assemble_align              PROTO((int));
 262
 263 /* Assemble a string constant with the specified C string as contents.  */
 264 extern void assemble_string             PROTO((const char *, int));
 265 /* Assemble everything that is needed for a variable or function declaration.
 266    Not used for automatic variables, and not used for function definitions.
 267    Should not be called for variables of incomplete structure type.
 268
 269    TOP_LEVEL is nonzero if this variable has file scope.
 270    AT_END is nonzero if this is the special handling, at end of compilation,
 271    to define things that have had only tentative definitions.
 272    DONT_OUTPUT_DATA if nonzero means don't actually output the
 273    initial value (that will be done by the caller).  */
 274 extern void assemble_variable           PROTO((tree, int, int, int));
 275
 276 /* Output something to declare an external symbol to the assembler.
 277    (Most assemblers don't need this, so we normally output nothing.)
 278    Do nothing if DECL is not external.  */
 279 extern void assemble_external           PROTO((tree));
 280 #endif /* TREE_CODE */
 281
 282 #ifdef RTX_CODE
 283 /* Similar, for calling a library function FUN.  */
 284 extern void assemble_external_libcall   PROTO((rtx));
 285 #endif
 286
 287 /* Declare the label NAME global.  */
 288 extern void assemble_global             PROTO((char *));
 289
 290 /* Assemble a label named NAME.  */
 291 extern void assemble_label              PROTO((char *));
 292
 293 /* Output to FILE a reference to the assembler name of a C-level name NAME.
 294    If NAME starts with a *, the rest of NAME is output verbatim.
 295    Otherwise NAME is transformed in an implementation-defined way
 296    (usually by the addition of an underscore).
 297    Many macros in the tm file are defined to call this function.  */
 298 extern void assemble_name               PROTO((FILE *, const char *));
 299
 300 #ifdef RTX_CODE
 301 /* Assemble the integer constant X into an object of SIZE bytes.
 302    X must be either a CONST_INT or CONST_DOUBLE.
 303
 304    Return 1 if we were able to output the constant, otherwise 0.  If FORCE is
 305    non-zero, abort if we can't output the constant.  */
 306 extern int assemble_integer             PROTO((rtx, int, int));
 307
 308 #ifdef EMUSHORT
 309 /* Assemble the floating-point constant D into an object of size MODE.  */
 310 extern void assemble_real               PROTO((REAL_VALUE_TYPE,
 311                                                enum machine_mode));
 312 #endif
 313 #endif
 314
 315 /* At the end of a function, forget the memory-constants
 316    previously made for CONST_DOUBLEs.  Mark them as not on real_constant_chain.
 317    Also clear out real_constant_chain and clear out all the chain-pointers.  */
 318 extern void clear_const_double_mem      PROTO((void));
 319
 320 /* Start deferring output of subconstants.  */
 321 extern void defer_addressed_constants   PROTO((void));
 322
 323 /* Stop deferring output of subconstants,
 324    and output now all those that have been deferred.  */
 325 extern void output_deferred_addressed_constants PROTO((void));
 326
 327 /* Return the size of the constant pool.  */
 328 extern int get_pool_size                PROTO((void));
 329
 330 #ifdef HAVE_peephole
 331 extern rtx peephole                     PROTO((rtx));
 332 #endif
 333
 334 #ifdef TREE_CODE
 335 /* Write all the constants in the constant pool.  */
 336 extern void output_constant_pool        PROTO((char *, tree));
 337
 338 /* Output assembler code for constant EXP to FILE, with no label.
 339    This includes the pseudo-op such as ".int" or ".byte", and a newline.
 340    Assumes output_addressed_constants has been done on EXP already.
 341
 342    Generate exactly SIZE bytes of assembler data, padding at the end
 343    with zeros if necessary.  SIZE must always be specified.  */
 344 extern void output_constant             PROTO((tree, int));
 345 #endif
 346
 347 /* When outputting assembler code, indicates which alternative
 348    of the constraints was actually satisfied.  */
 349 extern int which_alternative;
 350
 351 #ifdef RTX_CODE
 352 /* When outputting delayed branch sequences, this rtx holds the
 353    sequence being output.  It is null when no delayed branch
 354    sequence is being output, so it can be used as a test in the
 355    insn output code.
 356
 357    This variable is defined  in final.c.  */
 358 extern rtx final_sequence;
 359 #endif
 360
 361 /* Nonzero means generate position-independent code.
 362    This is not fully implemented yet.  */
 363
 364 extern int flag_pic;
 365
 366 /* The line number of the beginning of the current function.
 367    sdbout.c needs this so that it can output relative linenumbers.  */
 368
 369 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers.  */
 370 extern int sdb_begin_function_line;
 371 #endif
 372
 373 /* File in which assembler code is being written.  */
 374
 375 #ifdef BUFSIZ
 376 extern FILE *asm_out_file;
 377 #endif
 378 /* Nonzero if function being compiled doesn't contain any calls
 379    (ignoring the prologue and epilogue).  This is set prior to
 380    local register allocation and is valid for the remaining
 381    compiler passes. */
 382
 383 extern int current_function_is_leaf;
 384
 385 /* Nonzero if function being compiled doesn't modify the stack pointer
 386    (ignoring the prologue and epilogue).  This is only valid after
 387    life_analysis has run. */
 388
 389 extern int current_function_sp_is_unchanging;
 390
 391 /* Nonzero if the function being compiled is a leaf function which only
 392    uses leaf registers.  This is valid after reload (specifically after
 393    sched2) and is useful only if the port defines LEAF_REGISTERS.  */
 394
 395 extern int current_function_uses_only_leaf_regs;
 396
 397 /* Default file in which to dump debug output.  */
 398
 399 #ifdef BUFSIZ
 400 extern FILE *rtl_dump_file;
 401 #endif
 402
 403 /* Decide whether DECL needs to be in a writable section.  RELOC is the same
 404    as for SELECT_SECTION.  */
 405
 406 #define DECL_READONLY_SECTION(DECL,RELOC)               \
 407   (TREE_READONLY (DECL)                                 \
 408    && ! TREE_THIS_VOLATILE (DECL)                       \
 409    && DECL_INITIAL (DECL)                               \
 410    && (DECL_INITIAL (DECL) == error_mark_node           \
 411        || TREE_CONSTANT (DECL_INITIAL (DECL)))          \
 412    && ! (RELOC && (flag_pic || DECL_ONE_ONLY (DECL))))
 413
 414 /* User label prefix in effect for this compilation.  */
 415 extern const char *user_label_prefix;
 416
 417 /* This macro gets just the user-specified name
 418    out of the string in a SYMBOL_REF.  On most machines,
 419    we discard the * if any and that's all.  */
 420 #ifndef STRIP_NAME_ENCODING
 421 #define STRIP_NAME_ENCODING(VAR,SYMBOL_NAME) \
 422   (VAR) = ((SYMBOL_NAME) + ((SYMBOL_NAME)[0] == '*'))
 423 #endif