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, 1998,
   4    1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 2, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING.  If not, write to the Free
  20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  21 02111-1307, USA.  */
  22
  23 #ifndef GCC_OUTPUT_H
  24 #define GCC_OUTPUT_H
  25
  26 /* Compute branch alignments based on frequency information in the CFG.  */
  27 extern void compute_alignments (void);
  28
  29 /* Initialize data in final at the beginning of a compilation.  */
  30 extern void init_final (const char *);
  31
  32 /* Enable APP processing of subsequent output.
  33    Used before the output from an `asm' statement.  */
  34 extern void app_enable (void);
  35
  36 /* Disable APP processing of subsequent output.
  37    Called from varasm.c before most kinds of output.  */
  38 extern void app_disable (void);
  39
  40 /* Return the number of slots filled in the current
  41    delayed branch sequence (we don't count the insn needing the
  42    delay slot).   Zero if not in a delayed branch sequence.  */
  43 extern int dbr_sequence_length (void);
  44
  45 /* Indicate that branch shortening hasn't yet been done.  */
  46 extern void init_insn_lengths (void);
  47
  48 /* Obtain the current length of an insn.  If branch shortening has been done,
  49    get its actual length.  Otherwise, get its maximum length.  */
  50 extern int get_attr_length (rtx);
  51
  52 /* Make a pass over all insns and compute their actual lengths by shortening
  53    any branches of variable length if possible.  */
  54 extern void shorten_branches (rtx);
  55
  56 /* Output assembler code for the start of a function,
  57    and initialize some of the variables in this file
  58    for the new function.  The label for the function and associated
  59    assembler pseudo-ops have already been output in
  60    `assemble_start_function'.  */
  61 extern void final_start_function (rtx, FILE *, int);
  62
  63 /* Output assembler code for the end of a function.
  64    For clarity, args are same as those of `final_start_function'
  65    even though not all of them are needed.  */
  66 extern void final_end_function (void);
  67
  68 /* Output assembler code for some insns: all or part of a function.  */
  69 extern void final (rtx, FILE *, int, int);
  70
  71 /* The final scan for one insn, INSN.  Args are same as in `final', except
  72    that INSN is the insn being scanned.  Value returned is the next insn to
  73    be scanned.  */
  74 extern rtx final_scan_insn (rtx, FILE *, int, int, int, int *);
  75
  76 /* Replace a SUBREG with a REG or a MEM, based on the thing it is a
  77    subreg of.  */
  78 extern rtx alter_subreg (rtx *);
  79
  80 /* Report inconsistency between the assembler template and the operands.
  81    In an `asm', it's the user's fault; otherwise, the compiler's fault.  */
  82 extern void output_operand_lossage (const char *, ...) ATTRIBUTE_PRINTF_1;
  83
  84 /* Output a string of assembler code, substituting insn operands.
  85    Defined in final.c.  */
  86 extern void output_asm_insn (const char *, rtx *);
  87
  88 /* Compute a worst-case reference address of a branch so that it
  89    can be safely used in the presence of aligned labels.
  90    Defined in final.c.  */
  91 extern int insn_current_reference_address (rtx);
  92
  93 /* Find the alignment associated with a CODE_LABEL.
  94    Defined in final.c.  */
  95 extern int label_to_alignment (rtx);
  96
  97 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol.  */
  98 extern void output_asm_label (rtx);
  99
 100 /* Print a memory reference operand for address X
 101    using machine-dependent assembler syntax.  */
 102 extern void output_address (rtx);
 103
 104 /* Print an integer constant expression in assembler syntax.
 105    Addition and subtraction are the only arithmetic
 106    that may appear in these expressions.  */
 107 extern void output_addr_const (FILE *, rtx);
 108
 109 /* Output a string of assembler code, substituting numbers, strings
 110    and fixed syntactic prefixes.  */
 111 #if GCC_VERSION >= 3004
 112 #define ATTRIBUTE_ASM_FPRINTF(m, n) __attribute__ ((__format__ (__asm_fprintf__, m, n))) ATTRIBUTE_NONNULL(m)
 113 /* This is a magic identifier which allows GCC to figure out the type
 114    of HOST_WIDE_INT for %wd specifier checks.  You must issue this
 115    typedef before using the __asm_fprintf__ format attribute.  */
 116 typedef HOST_WIDE_INT __gcc_host_wide_int__;
 117 #else
 118 #define ATTRIBUTE_ASM_FPRINTF(m, n) ATTRIBUTE_NONNULL(m)
 119 #endif
 120
 121 extern void asm_fprintf (FILE *file, const char *p, ...)
 122      ATTRIBUTE_ASM_FPRINTF(2, 3);
 123
 124 /* Split up a CONST_DOUBLE or integer constant rtx into two rtx's for single
 125    words.  */
 126 extern void split_double (rtx, rtx *, rtx *);
 127
 128 /* Return nonzero if this function has no function calls.  */
 129 extern int leaf_function_p (void);
 130
 131 /* Return 1 if branch is a forward branch.
 132    Uses insn_shuid array, so it works only in the final pass.  May be used by
 133    output templates to add branch prediction hints, for example.  */
 134 extern int final_forward_branch_p (rtx);
 135
 136 /* Return 1 if this function uses only the registers that can be
 137    safely renumbered.  */
 138 extern int only_leaf_regs_used (void);
 139
 140 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
 141    available in leaf functions.  */
 142 extern void leaf_renumber_regs_insn (rtx);
 143
 144 /* Locate the proper template for the given insn-code.  */
 145 extern const char *get_insn_template (int, rtx);
 146
 147 /* Add function NAME to the weak symbols list.  VALUE is a weak alias
 148    associated with NAME.  */
 149 extern int add_weak (tree, const char *, const char *);
 150
 151 /* Functions in flow.c */
 152 extern void allocate_for_life_analysis (void);
 153 extern int regno_uninitialized (unsigned int);
 154 extern int regno_clobbered_at_setjmp (int);
 155 extern void find_basic_blocks (rtx, int, FILE *);
 156 extern bool cleanup_cfg (int);
 157 extern bool delete_unreachable_blocks (void);
 158 extern void check_function_return_warnings (void);
 159
 160 /* Functions in varasm.c.  */
 161
 162 /* Tell assembler to switch to text section.  */
 163 extern void text_section (void);
 164
 165 /* Tell assembler to switch to data section.  */
 166 extern void data_section (void);
 167
 168 /* Tell assembler to switch to read-only data section.  This is normally
 169    the text section.  */
 170 extern void readonly_data_section (void);
 171
 172 /* Determine if we're in the text section.  */
 173 extern int in_text_section (void);
 174
 175 #ifdef CTORS_SECTION_ASM_OP
 176 extern void ctors_section (void);
 177 #endif
 178
 179 #ifdef DTORS_SECTION_ASM_OP
 180 extern void dtors_section (void);
 181 #endif
 182
 183 #ifdef BSS_SECTION_ASM_OP
 184 extern void bss_section (void);
 185 #endif
 186
 187 #ifdef INIT_SECTION_ASM_OP
 188 extern void init_section (void);
 189 #endif
 190
 191 #ifdef FINI_SECTION_ASM_OP
 192 extern void fini_section (void);
 193 #endif
 194
 195 #ifdef EXPORTS_SECTION_ASM_OP
 196 extern void exports_section (void);
 197 #endif
 198
 199 #ifdef DRECTVE_SECTION_ASM_OP
 200 extern void drectve_section (void);
 201 #endif
 202
 203 #ifdef SDATA_SECTION_ASM_OP
 204 extern void sdata_section (void);
 205 #endif
 206
 207 /* Tell assembler to change to section NAME for DECL.
 208    If DECL is NULL, just switch to section NAME.
 209    If NAME is NULL, get the name from DECL.
 210    If RELOC is 1, the initializer for DECL contains relocs.  */
 211 extern void named_section (tree, const char *, int);
 212
 213 /* Tell assembler to switch to the section for function DECL.  */
 214 extern void function_section (tree);
 215
 216 /* Tell assembler to switch to the section for string merging.  */
 217 extern void mergeable_string_section (tree, unsigned HOST_WIDE_INT,
 218                                       unsigned int);
 219
 220 /* Tell assembler to switch to the section for constant merging.  */
 221 extern void mergeable_constant_section (enum machine_mode,
 222                                         unsigned HOST_WIDE_INT, unsigned int);
 223
 224 /* Declare DECL to be a weak symbol.  */
 225 extern void declare_weak (tree);
 226 /* Merge weak status.  */
 227 extern void merge_weak (tree, tree);
 228
 229 /* Emit any pending weak declarations.  */
 230 extern void weak_finish (void);
 231
 232 /* Decode an `asm' spec for a declaration as a register name.
 233    Return the register number, or -1 if nothing specified,
 234    or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
 235    or -3 if ASMSPEC is `cc' and is not recognized,
 236    or -4 if ASMSPEC is `memory' and is not recognized.
 237    Accept an exact spelling or a decimal number.
 238    Prefixes such as % are optional.  */
 239 extern int decode_reg_name (const char *);
 240
 241 /* Make the rtl for variable VAR be volatile.
 242    Use this only for static variables.  */
 243 extern void make_var_volatile (tree);
 244
 245 extern void assemble_alias (tree, tree);
 246
 247 extern void default_assemble_visibility (tree, int);
 248
 249 /* Output a string of literal assembler code
 250    for an `asm' keyword used between functions.  */
 251 extern void assemble_asm (tree);
 252
 253 /* Output assembler code for the constant pool of a function and associated
 254    with defining the name of the function.  DECL describes the function.
 255    NAME is the function's name.  For the constant pool, we use the current
 256    constant pool data.  */
 257 extern void assemble_start_function (tree, const char *);
 258
 259 /* Output assembler code associated with defining the size of the
 260    function.  DECL describes the function.  NAME is the function's name.  */
 261 extern void assemble_end_function (tree, const char *);
 262
 263 /* Assemble everything that is needed for a variable or function declaration.
 264    Not used for automatic variables, and not used for function definitions.
 265    Should not be called for variables of incomplete structure type.
 266
 267    TOP_LEVEL is nonzero if this variable has file scope.
 268    AT_END is nonzero if this is the special handling, at end of compilation,
 269    to define things that have had only tentative definitions.
 270    DONT_OUTPUT_DATA if nonzero means don't actually output the
 271    initial value (that will be done by the caller).  */
 272 extern void assemble_variable (tree, int, int, int);
 273
 274 /* Output something to declare an external symbol to the assembler.
 275    (Most assemblers don't need this, so we normally output nothing.)
 276    Do nothing if DECL is not external.  */
 277 extern void assemble_external (tree);
 278
 279 /* Assemble code to leave SIZE bytes of zeros.  */
 280 extern void assemble_zeros (unsigned HOST_WIDE_INT);
 281
 282 /* Assemble an alignment pseudo op for an ALIGN-bit boundary.  */
 283 extern void assemble_align (int);
 284 extern void assemble_eh_align (int);
 285
 286 /* Assemble a string constant with the specified C string as contents.  */
 287 extern void assemble_string (const char *, int);
 288
 289 /* Similar, for calling a library function FUN.  */
 290 extern void assemble_external_libcall (rtx);
 291
 292 /* Assemble a label named NAME.  */
 293 extern void assemble_label (const char *);
 294 extern void assemble_eh_label (const char *);
 295
 296 /* Output to FILE a reference to the assembler name of a C-level name NAME.
 297    If NAME starts with a *, the rest of NAME is output verbatim.
 298    Otherwise NAME is transformed in an implementation-defined way
 299    (usually by the addition of an underscore).
 300    Many macros in the tm file are defined to call this function.  */
 301 extern void assemble_name (FILE *, const char *);
 302
 303 /* Return the assembler directive for creating a given kind of integer
 304    object.  SIZE is the number of bytes in the object and ALIGNED_P
 305    indicates whether it is known to be aligned.  Return NULL if the
 306    assembly dialect has no such directive.
 307
 308    The returned string should be printed at the start of a new line and
 309    be followed immediately by the object's initial value.  */
 310 extern const char *integer_asm_op (int, int);
 311
 312 /* Use directive OP to assemble an integer object X.  Print OP at the
 313    start of the line, followed immediately by the value of X.  */
 314 extern void assemble_integer_with_op (const char *, rtx);
 315
 316 /* The default implementation of the asm_out.integer target hook.  */
 317 extern bool default_assemble_integer (rtx, unsigned int, int);
 318
 319 /* Assemble the integer constant X into an object of SIZE bytes.  ALIGN is
 320    the alignment of the integer in bits.  Return 1 if we were able to output
 321    the constant, otherwise 0.  If FORCE is nonzero, abort if we can't output
 322    the constant.  */
 323 extern bool assemble_integer (rtx, unsigned, unsigned, int);
 324
 325 /* An interface to assemble_integer for the common case in which a value is
 326    fully aligned and must be printed.  VALUE is the value of the integer
 327    object and SIZE is the number of bytes it contains.  */
 328 #define assemble_aligned_integer(SIZE, VALUE) \
 329   assemble_integer (VALUE, SIZE, (SIZE) * BITS_PER_UNIT, 1)
 330
 331 #ifdef REAL_VALUE_TYPE_SIZE
 332 /* Assemble the floating-point constant D into an object of size MODE.  */
 333 extern void assemble_real (REAL_VALUE_TYPE, enum machine_mode, unsigned);
 334 #endif
 335
 336 /* Return the size of the constant pool.  */
 337 extern int get_pool_size (void);
 338
 339 #ifdef HAVE_peephole
 340 extern rtx peephole (rtx);
 341 #endif
 342
 343 /* Write all the constants in the constant pool.  */
 344 extern void output_constant_pool (const char *, tree);
 345
 346 /* Return nonzero if VALUE is a valid constant-valued expression
 347    for use in initializing a static variable; one that can be an
 348    element of a "constant" initializer.
 349
 350    Return null_pointer_node if the value is absolute;
 351    if it is relocatable, return the variable that determines the relocation.
 352    We assume that VALUE has been folded as much as possible;
 353    therefore, we do not need to check for such things as
 354    arithmetic-combinations of integers.  */
 355 extern tree initializer_constant_valid_p (tree, tree);
 356
 357 /* Output assembler code for constant EXP to FILE, with no label.
 358    This includes the pseudo-op such as ".int" or ".byte", and a newline.
 359    Assumes output_addressed_constants has been done on EXP already.
 360
 361    Generate exactly SIZE bytes of assembler data, padding at the end
 362    with zeros if necessary.  SIZE must always be specified.
 363
 364    ALIGN is the alignment in bits that may be assumed for the data.  */
 365 extern void output_constant (tree, unsigned HOST_WIDE_INT, unsigned int);
 366
 367 /* When outputting delayed branch sequences, this rtx holds the
 368    sequence being output.  It is null when no delayed branch
 369    sequence is being output, so it can be used as a test in the
 370    insn output code.
 371
 372    This variable is defined  in final.c.  */
 373 extern rtx final_sequence;
 374
 375 /* The line number of the beginning of the current function.  Various
 376    md code needs this so that it can output relative linenumbers.  */
 377
 378 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers.  */
 379 extern int sdb_begin_function_line;
 380 #endif
 381
 382 /* File in which assembler code is being written.  */
 383
 384 #ifdef BUFSIZ
 385 extern FILE *asm_out_file;
 386 #endif
 387
 388 /* The first global object in the file.  */
 389 extern const char *first_global_object_name;
 390
 391 /* The first weak object in the file.  */
 392 extern const char *weak_global_object_name;
 393
 394 /* Nonzero if function being compiled doesn't contain any calls
 395    (ignoring the prologue and epilogue).  This is set prior to
 396    local register allocation and is valid for the remaining
 397    compiler passes.  */
 398
 399 extern int current_function_is_leaf;
 400
 401 /* Nonzero if function being compiled doesn't contain any instructions
 402    that can throw an exception.  This is set prior to final.  */
 403
 404 extern int current_function_nothrow;
 405
 406 /* Nonzero if function being compiled doesn't modify the stack pointer
 407    (ignoring the prologue and epilogue).  This is only valid after
 408    life_analysis has run.  */
 409
 410 extern int current_function_sp_is_unchanging;
 411
 412 /* Nonzero if the function being compiled is a leaf function which only
 413    uses leaf registers.  This is valid after reload (specifically after
 414    sched2) and is useful only if the port defines LEAF_REGISTERS.  */
 415
 416 extern int current_function_uses_only_leaf_regs;
 417
 418 /* Default file in which to dump debug output.  */
 419
 420 #ifdef BUFSIZ
 421 extern FILE *rtl_dump_file;
 422 #endif
 423
 424 /* Nonnull if the insn currently being emitted was a COND_EXEC pattern.  */
 425 extern rtx current_insn_predicate;
 426
 427 /* Last insn processed by final_scan_insn.  */
 428 extern rtx current_output_insn;
 429
 430 /* Nonzero while outputting an `asm' with operands.
 431    This means that inconsistencies are the user's fault, so don't abort.
 432    The precise value is the insn being output, to pass to error_for_asm.  */
 433 extern rtx this_is_asm_operands;
 434
 435 /* Decide whether DECL needs to be in a writable section.
 436    RELOC is the same as for SELECT_SECTION.  */
 437 extern bool decl_readonly_section (tree, int);
 438 extern bool decl_readonly_section_1 (tree, int, int);
 439
 440 /* This can be used to compute RELOC for the function above, when
 441    given a constant expression.  */
 442 extern int compute_reloc_for_constant (tree);
 443
 444 /* User label prefix in effect for this compilation.  */
 445 extern const char *user_label_prefix;
 446
 447 /* Default target function prologue and epilogue assembler output.  */
 448 extern void default_function_pro_epilogue (FILE *, HOST_WIDE_INT);
 449
 450 /* Tell assembler to switch to the section for the exception table.  */
 451 extern void default_exception_section (void);
 452
 453 /* Tell assembler to switch to the section for the EH frames.  */
 454 extern void named_section_eh_frame_section (void);
 455 extern void collect2_eh_frame_section (void);
 456 extern void default_eh_frame_section (void);
 457
 458 /* Default target hook that outputs nothing to a stream.  */
 459 extern void no_asm_to_stream (FILE *);
 460
 461 /* Flags controlling properties of a section.  */
 462 #define SECTION_ENTSIZE  0x000ff        /* entity size in section */
 463 #define SECTION_CODE     0x00100        /* contains code */
 464 #define SECTION_WRITE    0x00200        /* data is writable */
 465 #define SECTION_DEBUG    0x00400        /* contains debug data */
 466 #define SECTION_LINKONCE 0x00800        /* is linkonce */
 467 #define SECTION_SMALL    0x01000        /* contains "small data" */
 468 #define SECTION_BSS      0x02000        /* contains zeros only */
 469 #define SECTION_FORGET   0x04000        /* forget that we've entered the section */
 470 #define SECTION_MERGE    0x08000        /* contains mergeable data */
 471 #define SECTION_STRINGS  0x10000        /* contains zero terminated strings without
 472                                            embedded zeros */
 473 #define SECTION_OVERRIDE 0x20000        /* allow override of default flags */
 474 #define SECTION_TLS      0x40000        /* contains thread-local storage */
 475 #define SECTION_NOTYPE   0x80000        /* don't output @progbits */
 476 #define SECTION_MACH_DEP 0x100000       /* subsequent bits reserved for target */
 477
 478 extern unsigned int get_named_section_flags (const char *);
 479 extern bool set_named_section_flags (const char *, unsigned int);
 480 extern void named_section_flags (const char *, unsigned int);
 481 extern bool named_section_first_declaration (const char *);
 482 extern unsigned int default_section_type_flags (tree, const char *, int);
 483 extern unsigned int default_section_type_flags_1 (tree, const char *, int, int);
 484
 485 extern void default_no_named_section (const char *, unsigned int);
 486 extern void default_elf_asm_named_section (const char *, unsigned int);
 487 extern void default_coff_asm_named_section (const char *, unsigned int);
 488 extern void default_pe_asm_named_section (const char *, unsigned int);
 489
 490 extern void default_stabs_asm_out_destructor (rtx, int);
 491 extern void default_named_section_asm_out_destructor (rtx, int);
 492 extern void default_dtor_section_asm_out_destructor (rtx, int);
 493 extern void default_stabs_asm_out_constructor (rtx, int);
 494 extern void default_named_section_asm_out_constructor (rtx, int);
 495 extern void default_ctor_section_asm_out_constructor (rtx, int);
 496
 497 extern void default_select_section (tree, int, unsigned HOST_WIDE_INT);
 498 extern void default_elf_select_section (tree, int, unsigned HOST_WIDE_INT);
 499 extern void default_elf_select_section_1 (tree, int,
 500                                           unsigned HOST_WIDE_INT, int);
 501 extern void default_unique_section (tree, int);
 502 extern void default_unique_section_1 (tree, int, int);
 503 extern void default_select_rtx_section (enum machine_mode, rtx,
 504                                         unsigned HOST_WIDE_INT);
 505 extern void default_elf_select_rtx_section (enum machine_mode, rtx,
 506                                             unsigned HOST_WIDE_INT);
 507 extern void default_encode_section_info (tree, rtx, int);
 508 extern const char *default_strip_name_encoding (const char *);
 509 extern bool default_binds_local_p (tree);
 510 extern bool default_binds_local_p_1 (tree, int);
 511 extern void default_globalize_label (FILE *, const char *);
 512 extern void default_internal_label (FILE *, const char *, unsigned long);
 513 extern void default_file_start (void);
 514 extern void file_end_indicate_exec_stack (void);
 515 extern bool default_valid_pointer_mode (enum machine_mode);
 516
 517 extern int default_address_cost (rtx);
 518
 519 #endif /* ! GCC_OUTPUT_H */