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, 1999, 2000, 2001, 2002,
   4    2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
   5    Free Software Foundation, Inc.
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify it under
  10 the terms of the GNU General Public License as published by the Free
  11 Software Foundation; either version 3, or (at your option) any later
  12 version.
  13
  14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17 for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING3.  If not see
  21 <http://www.gnu.org/licenses/>.  */
  22
  23 #ifndef GCC_OUTPUT_H
  24 #define GCC_OUTPUT_H
  25
  26 /* Initialize data in final at the beginning of a compilation.  */
  27 extern void init_final (const char *);
  28
  29 /* Enable APP processing of subsequent output.
  30    Used before the output from an `asm' statement.  */
  31 extern void app_enable (void);
  32
  33 /* Disable APP processing of subsequent output.
  34    Called from varasm.c before most kinds of output.  */
  35 extern void app_disable (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 (void);
  41
  42 /* Indicate that branch shortening hasn't yet been done.  */
  43 extern void init_insn_lengths (void);
  44
  45 /* Obtain the current length of an insn.  If branch shortening has been done,
  46    get its actual length.  Otherwise, get its maximum length.  */
  47 extern int get_attr_length (rtx);
  48
  49 /* Obtain the current length of an insn.  If branch shortening has been done,
  50    get its actual length.  Otherwise, get its minimum length.  */
  51 extern int get_attr_min_length (rtx);
  52
  53 /* Make a pass over all insns and compute their actual lengths by shortening
  54    any branches of variable length if possible.  */
  55 extern void shorten_branches (rtx);
  56
  57 /* Output assembler code for the start of a function,
  58    and initialize some of the variables in this file
  59    for the new function.  The label for the function and associated
  60    assembler pseudo-ops have already been output in
  61    `assemble_start_function'.  */
  62 extern void final_start_function (rtx, FILE *, int);
  63
  64 /* Output assembler code for the end of a function.
  65    For clarity, args are same as those of `final_start_function'
  66    even though not all of them are needed.  */
  67 extern void final_end_function (void);
  68
  69 /* Output assembler code for some insns: all or part of a function.  */
  70 extern void final (rtx, FILE *, int);
  71
  72 /* The final scan for one insn, INSN.  Args are same as in `final', except
  73    that INSN is the insn being scanned.  Value returned is the next insn to
  74    be scanned.  */
  75 extern rtx final_scan_insn (rtx, FILE *, int, int, int *);
  76
  77 /* Replace a SUBREG with a REG or a MEM, based on the thing it is a
  78    subreg of.  */
  79 extern rtx alter_subreg (rtx *);
  80
  81 /* Print an operand using machine-dependent assembler syntax.  */
  82 extern void output_operand (rtx, int);
  83
  84 /* Report inconsistency between the assembler template and the operands.
  85    In an `asm', it's the user's fault; otherwise, the compiler's fault.  */
  86 extern void output_operand_lossage (const char *, ...) ATTRIBUTE_PRINTF_1;
  87
  88 /* Output a string of assembler code, substituting insn operands.
  89    Defined in final.c.  */
  90 extern void output_asm_insn (const char *, rtx *);
  91
  92 /* Compute a worst-case reference address of a branch so that it
  93    can be safely used in the presence of aligned labels.
  94    Defined in final.c.  */
  95 extern int insn_current_reference_address (rtx);
  96
  97 /* Find the alignment associated with a CODE_LABEL.
  98    Defined in final.c.  */
  99 extern int label_to_alignment (rtx);
 100
 101 /* Find the alignment maximum skip associated with a CODE_LABEL.
 102    Defined in final.c.  */
 103 extern int label_to_max_skip (rtx);
 104
 105 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol.  */
 106 extern void output_asm_label (rtx);
 107
 108 /* Marks SYMBOL_REFs in x as referenced through use of assemble_external.  */
 109 extern void mark_symbol_refs_as_used (rtx);
 110
 111 /* Print a memory reference operand for address X
 112    using machine-dependent assembler syntax.  */
 113 extern void output_address (rtx);
 114
 115 /* Print an integer constant expression in assembler syntax.
 116    Addition and subtraction are the only arithmetic
 117    that may appear in these expressions.  */
 118 extern void output_addr_const (FILE *, rtx);
 119
 120 /* Output a string of assembler code, substituting numbers, strings
 121    and fixed syntactic prefixes.  */
 122 #if GCC_VERSION >= 3004
 123 #define ATTRIBUTE_ASM_FPRINTF(m, n) __attribute__ ((__format__ (__asm_fprintf__, m, n))) ATTRIBUTE_NONNULL(m)
 124 /* This is a magic identifier which allows GCC to figure out the type
 125    of HOST_WIDE_INT for %wd specifier checks.  You must issue this
 126    typedef before using the __asm_fprintf__ format attribute.  */
 127 typedef HOST_WIDE_INT __gcc_host_wide_int__;
 128 #else
 129 #define ATTRIBUTE_ASM_FPRINTF(m, n) ATTRIBUTE_NONNULL(m)
 130 #endif
 131
 132 extern void asm_fprintf (FILE *file, const char *p, ...)
 133      ATTRIBUTE_ASM_FPRINTF(2, 3);
 134
 135 /* Split up a CONST_DOUBLE or integer constant rtx into two rtx's for single
 136    words.  */
 137 extern void split_double (rtx, rtx *, rtx *);
 138
 139 /* Return nonzero if this function has no function calls.  */
 140 extern int leaf_function_p (void);
 141
 142 /* Return 1 if branch is a forward branch.
 143    Uses insn_shuid array, so it works only in the final pass.  May be used by
 144    output templates to add branch prediction hints, for example.  */
 145 extern int final_forward_branch_p (rtx);
 146
 147 /* Return 1 if this function uses only the registers that can be
 148    safely renumbered.  */
 149 extern int only_leaf_regs_used (void);
 150
 151 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
 152    available in leaf functions.  */
 153 extern void leaf_renumber_regs_insn (rtx);
 154
 155 /* Locate the proper template for the given insn-code.  */
 156 extern const char *get_insn_template (int, rtx);
 157
 158 /* Functions in varasm.c.  */
 159
 160 /* Declare DECL to be a weak symbol.  */
 161 extern void declare_weak (tree);
 162 /* Merge weak status.  */
 163 extern void merge_weak (tree, tree);
 164
 165 /* Emit any pending weak declarations.  */
 166 extern void weak_finish (void);
 167
 168 /* Return the default TLS model for a given variable.  */
 169 extern enum tls_model decl_default_tls_model (const_tree);
 170
 171 /* Decode an `asm' spec for a declaration as a register name.
 172    Return the register number, or -1 if nothing specified,
 173    or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
 174    or -3 if ASMSPEC is `cc' and is not recognized,
 175    or -4 if ASMSPEC is `memory' and is not recognized.
 176    Accept an exact spelling or a decimal number.
 177    Prefixes such as % are optional.  */
 178 extern int decode_reg_name (const char *);
 179
 180 extern void assemble_alias (tree, tree);
 181
 182 extern void default_assemble_visibility (tree, int);
 183
 184 /* Output a string of literal assembler code
 185    for an `asm' keyword used between functions.  */
 186 extern void assemble_asm (tree);
 187
 188 /* Output assembler code for the constant pool of a function and associated
 189    with defining the name of the function.  DECL describes the function.
 190    NAME is the function's name.  For the constant pool, we use the current
 191    constant pool data.  */
 192 extern void assemble_start_function (tree, const char *);
 193
 194 /* Output assembler code associated with defining the size of the
 195    function.  DECL describes the function.  NAME is the function's name.  */
 196 extern void assemble_end_function (tree, const char *);
 197
 198 /* Assemble everything that is needed for a variable or function declaration.
 199    Not used for automatic variables, and not used for function definitions.
 200    Should not be called for variables of incomplete structure type.
 201
 202    TOP_LEVEL is nonzero if this variable has file scope.
 203    AT_END is nonzero if this is the special handling, at end of compilation,
 204    to define things that have had only tentative definitions.
 205    DONT_OUTPUT_DATA if nonzero means don't actually output the
 206    initial value (that will be done by the caller).  */
 207 extern void assemble_variable (tree, int, int, int);
 208
 209 /* Compute the alignment of variable specified by DECL.
 210    DONT_OUTPUT_DATA is from assemble_variable.  */
 211 extern void align_variable (tree decl, bool dont_output_data);
 212
 213 /* Queue for outputting something to declare an external symbol to the
 214    assembler.  (Most assemblers don't need this, so we normally output
 215    nothing.)  Do nothing if DECL is not external.  */
 216 extern void assemble_external (tree);
 217
 218 /* Assemble code to leave SIZE bytes of zeros.  */
 219 extern void assemble_zeros (unsigned HOST_WIDE_INT);
 220
 221 /* Assemble an alignment pseudo op for an ALIGN-bit boundary.  */
 222 extern void assemble_align (int);
 223
 224 /* Assemble a string constant with the specified C string as contents.  */
 225 extern void assemble_string (const char *, int);
 226
 227 /* Similar, for calling a library function FUN.  */
 228 extern void assemble_external_libcall (rtx);
 229
 230 /* Assemble a label named NAME.  */
 231 extern void assemble_label (FILE *, const char *);
 232
 233 /* Output to FILE (an assembly file) a reference to NAME.  If NAME
 234    starts with a *, the rest of NAME is output verbatim.  Otherwise
 235    NAME is transformed in a target-specific way (usually by the
 236    addition of an underscore).  */
 237 extern void assemble_name_raw (FILE *, const char *);
 238
 239 /* Like assemble_name_raw, but should be used when NAME might refer to
 240    an entity that is also represented as a tree (like a function or
 241    variable).  If NAME does refer to such an entity, that entity will
 242    be marked as referenced.  */
 243 extern void assemble_name (FILE *, const char *);
 244
 245 /* Return the assembler directive for creating a given kind of integer
 246    object.  SIZE is the number of bytes in the object and ALIGNED_P
 247    indicates whether it is known to be aligned.  Return NULL if the
 248    assembly dialect has no such directive.
 249
 250    The returned string should be printed at the start of a new line and
 251    be followed immediately by the object's initial value.  */
 252 extern const char *integer_asm_op (int, int);
 253
 254 /* Use directive OP to assemble an integer object X.  Print OP at the
 255    start of the line, followed immediately by the value of X.  */
 256 extern void assemble_integer_with_op (const char *, rtx);
 257
 258 /* The default implementation of the asm_out.integer target hook.  */
 259 extern bool default_assemble_integer (rtx, unsigned int, int);
 260
 261 /* Assemble the integer constant X into an object of SIZE bytes.  ALIGN is
 262    the alignment of the integer in bits.  Return 1 if we were able to output
 263    the constant, otherwise 0.  If FORCE is nonzero the constant must
 264    be outputable. */
 265 extern bool assemble_integer (rtx, unsigned, unsigned, int);
 266
 267 /* An interface to assemble_integer for the common case in which a value is
 268    fully aligned and must be printed.  VALUE is the value of the integer
 269    object and SIZE is the number of bytes it contains.  */
 270 #define assemble_aligned_integer(SIZE, VALUE) \
 271   assemble_integer (VALUE, SIZE, (SIZE) * BITS_PER_UNIT, 1)
 272
 273 #ifdef REAL_VALUE_TYPE_SIZE
 274 /* Assemble the floating-point constant D into an object of size MODE.  */
 275 extern void assemble_real (REAL_VALUE_TYPE, enum machine_mode, unsigned);
 276 #endif
 277
 278 /* Write the address of the entity given by SYMBOL to SEC.  */
 279 extern void assemble_addr_to_section (rtx, section *);
 280
 281 /* Return the size of the constant pool.  */
 282 extern int get_pool_size (void);
 283
 284 #ifdef HAVE_peephole
 285 extern rtx peephole (rtx);
 286 #endif
 287
 288 extern void output_shared_constant_pool (void);
 289
 290 extern void output_object_blocks (void);
 291
 292 /* Whether a constructor CTOR is a valid static constant initializer if all
 293    its elements are.  This used to be internal to initializer_constant_valid_p
 294    and has been exposed to let other functions like categorize_ctor_elements
 295    evaluate the property while walking a constructor for other purposes.  */
 296
 297 extern bool constructor_static_from_elts_p (const_tree);
 298
 299 /* Return nonzero if VALUE is a valid constant-valued expression
 300    for use in initializing a static variable; one that can be an
 301    element of a "constant" initializer.
 302
 303    Return null_pointer_node if the value is absolute;
 304    if it is relocatable, return the variable that determines the relocation.
 305    We assume that VALUE has been folded as much as possible;
 306    therefore, we do not need to check for such things as
 307    arithmetic-combinations of integers.  */
 308 extern tree initializer_constant_valid_p (tree, tree);
 309
 310 /* Return true if VALUE is a valid constant-valued expression
 311    for use in initializing a static bit-field; one that can be
 312    an element of a "constant" initializer.  */
 313 extern bool initializer_constant_valid_for_bitfield_p (tree);
 314
 315 /* Output assembler code for constant EXP to FILE, with no label.
 316    This includes the pseudo-op such as ".int" or ".byte", and a newline.
 317    Assumes output_addressed_constants has been done on EXP already.
 318
 319    Generate exactly SIZE bytes of assembler data, padding at the end
 320    with zeros if necessary.  SIZE must always be specified.
 321
 322    ALIGN is the alignment in bits that may be assumed for the data.  */
 323 extern void output_constant (tree, unsigned HOST_WIDE_INT, unsigned int);
 324
 325 /* When outputting delayed branch sequences, this rtx holds the
 326    sequence being output.  It is null when no delayed branch
 327    sequence is being output, so it can be used as a test in the
 328    insn output code.
 329
 330    This variable is defined  in final.c.  */
 331 extern rtx final_sequence;
 332
 333 /* The line number of the beginning of the current function.  Various
 334    md code needs this so that it can output relative linenumbers.  */
 335
 336 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers.  */
 337 extern int sdb_begin_function_line;
 338 #endif
 339
 340 /* File in which assembler code is being written.  */
 341
 342 #ifdef BUFSIZ
 343 extern FILE *asm_out_file;
 344 #endif
 345
 346 /* The first global object in the file.  */
 347 extern const char *first_global_object_name;
 348
 349 /* The first weak object in the file.  */
 350 extern const char *weak_global_object_name;
 351
 352 /* Nonzero if function being compiled doesn't contain any calls
 353    (ignoring the prologue and epilogue).  This is set prior to
 354    local register allocation and is valid for the remaining
 355    compiler passes.  */
 356
 357 extern int current_function_is_leaf;
 358
 359 /* Nonzero if function being compiled doesn't modify the stack pointer
 360    (ignoring the prologue and epilogue).  This is only valid after
 361    pass_stack_ptr_mod has run.  */
 362
 363 extern int current_function_sp_is_unchanging;
 364
 365 /* Nonzero if the function being compiled is a leaf function which only
 366    uses leaf registers.  This is valid after reload (specifically after
 367    sched2) and is useful only if the port defines LEAF_REGISTERS.  */
 368
 369 extern int current_function_uses_only_leaf_regs;
 370
 371 /* Default file in which to dump debug output.  */
 372
 373 #ifdef BUFSIZ
 374 extern FILE *dump_file;
 375 #endif
 376
 377 /* Nonnull if the insn currently being emitted was a COND_EXEC pattern.  */
 378 extern rtx current_insn_predicate;
 379
 380 /* Last insn processed by final_scan_insn.  */
 381 extern rtx current_output_insn;
 382
 383 /* Nonzero while outputting an `asm' with operands.
 384    This means that inconsistencies are the user's fault, so don't die.
 385    The precise value is the insn being output, to pass to error_for_asm.  */
 386 extern rtx this_is_asm_operands;
 387
 388 /* Carry information from ASM_DECLARE_OBJECT_NAME
 389    to ASM_FINISH_DECLARE_OBJECT.  */
 390 extern int size_directive_output;
 391 extern tree last_assemble_variable_decl;
 392
 393 extern bool first_function_block_is_cold;
 394
 395 /* Decide whether DECL needs to be in a writable section.
 396    RELOC is the same as for SELECT_SECTION.  */
 397 extern bool decl_readonly_section (const_tree, int);
 398
 399 /* This can be used to compute RELOC for the function above, when
 400    given a constant expression.  */
 401 extern int compute_reloc_for_constant (tree);
 402
 403 /* User label prefix in effect for this compilation.  */
 404 extern const char *user_label_prefix;
 405
 406 /* Default target function prologue and epilogue assembler output.  */
 407 extern void default_function_pro_epilogue (FILE *, HOST_WIDE_INT);
 408
 409 /* Default target hook that outputs nothing to a stream.  */
 410 extern void no_asm_to_stream (FILE *);
 411
 412 /* Flags controlling properties of a section.  */
 413 #define SECTION_ENTSIZE  0x000ff        /* entity size in section */
 414 #define SECTION_CODE     0x00100        /* contains code */
 415 #define SECTION_WRITE    0x00200        /* data is writable */
 416 #define SECTION_DEBUG    0x00400        /* contains debug data */
 417 #define SECTION_LINKONCE 0x00800        /* is linkonce */
 418 #define SECTION_SMALL    0x01000        /* contains "small data" */
 419 #define SECTION_BSS      0x02000        /* contains zeros only */
 420 #define SECTION_FORGET   0x04000        /* forget that we've entered the section */
 421 #define SECTION_MERGE    0x08000        /* contains mergeable data */
 422 #define SECTION_STRINGS  0x10000        /* contains zero terminated strings without
 423                                            embedded zeros */
 424 #define SECTION_OVERRIDE 0x20000        /* allow override of default flags */
 425 #define SECTION_TLS      0x40000        /* contains thread-local storage */
 426 #define SECTION_NOTYPE   0x80000        /* don't output @progbits */
 427 #define SECTION_DECLARED 0x100000       /* section has been used */
 428 #define SECTION_STYLE_MASK 0x600000     /* bits used for SECTION_STYLE */
 429 #define SECTION_COMMON   0x800000       /* contains common data */
 430 #define SECTION_MACH_DEP 0x1000000      /* subsequent bits reserved for target */
 431
 432 /* This SECTION_STYLE is used for unnamed sections that we can switch
 433    to using a special assembler directive.  */
 434 #define SECTION_UNNAMED  0x000000
 435
 436 /* This SECTION_STYLE is used for named sections that we can switch
 437    to using a general section directive.  */
 438 #define SECTION_NAMED    0x200000
 439
 440 /* This SECTION_STYLE is used for sections that we cannot switch to at
 441    all.  The choice of section is implied by the directive that we use
 442    to declare the object.  */
 443 #define SECTION_NOSWITCH 0x400000
 444
 445 /* A helper function for default_elf_select_section and
 446    default_elf_unique_section.  Categorizes the DECL.  */
 447
 448 enum section_category
 449 {
 450   SECCAT_TEXT,
 451
 452   SECCAT_RODATA,
 453   SECCAT_RODATA_MERGE_STR,
 454   SECCAT_RODATA_MERGE_STR_INIT,
 455   SECCAT_RODATA_MERGE_CONST,
 456   SECCAT_SRODATA,
 457
 458   SECCAT_DATA,
 459
 460   /* To optimize loading of shared programs, define following subsections
 461      of data section:
 462         _REL    Contains data that has relocations, so they get grouped
 463                 together and dynamic linker will visit fewer pages in memory.
 464         _RO     Contains data that is otherwise read-only.  This is useful
 465                 with prelinking as most relocations won't be dynamically
 466                 linked and thus stay read only.
 467         _LOCAL  Marks data containing relocations only to local objects.
 468                 These relocations will get fully resolved by prelinking.  */
 469   SECCAT_DATA_REL,
 470   SECCAT_DATA_REL_LOCAL,
 471   SECCAT_DATA_REL_RO,
 472   SECCAT_DATA_REL_RO_LOCAL,
 473
 474   SECCAT_SDATA,
 475   SECCAT_TDATA,
 476
 477   SECCAT_BSS,
 478   SECCAT_SBSS,
 479   SECCAT_TBSS
 480 };
 481
 482 /* Information that is provided by all instances of the section type.  */
 483 struct GTY(()) section_common {
 484   /* The set of SECTION_* flags that apply to this section.  */
 485   unsigned int flags;
 486 };
 487
 488 /* Information about a SECTION_NAMED section.  */
 489 struct GTY(()) named_section {
 490   struct section_common common;
 491
 492   /* The name of the section.  */
 493   const char *name;
 494
 495   /* If nonnull, the VAR_DECL or FUNCTION_DECL with which the
 496      section is associated.  */
 497   tree decl;
 498 };
 499
 500 /* A callback that writes the assembly code for switching to an unnamed
 501    section.  The argument provides callback-specific data.  */
 502 typedef void (*unnamed_section_callback) (const void *);
 503
 504 /* Information about a SECTION_UNNAMED section.  */
 505 struct GTY(()) unnamed_section {
 506   struct section_common common;
 507
 508   /* The callback used to switch to the section, and the data that
 509      should be passed to the callback.  */
 510   unnamed_section_callback GTY ((skip)) callback;
 511   const void *GTY ((skip)) data;
 512
 513   /* The next entry in the chain of unnamed sections.  */
 514   section *next;
 515 };
 516
 517 /* A callback that writes the assembly code for a decl in a
 518    SECTION_NOSWITCH section.  DECL is the decl that should be assembled
 519    and NAME is the name of its SYMBOL_REF.  SIZE is the size of the decl
 520    in bytes and ROUNDED is that size rounded up to the next
 521    BIGGEST_ALIGNMENT / BITS_PER_UNIT boundary.
 522
 523    Return true if the callback used DECL_ALIGN to set the object's
 524    alignment.  A false return value implies that we are relying
 525    on the rounded size to align the decl.  */
 526 typedef bool (*noswitch_section_callback) (tree decl, const char *name,
 527                                            unsigned HOST_WIDE_INT size,
 528                                            unsigned HOST_WIDE_INT rounded);
 529
 530 /* Information about a SECTION_NOSWITCH section.  */
 531 struct GTY(()) noswitch_section {
 532   struct section_common common;
 533
 534   /* The callback used to assemble decls in this section.  */
 535   noswitch_section_callback GTY ((skip)) callback;
 536 };
 537
 538 /* Information about a section, which may be named or unnamed.  */
 539 union GTY ((desc ("SECTION_STYLE (&(%h))"))) section {
 540   struct section_common GTY ((skip)) common;
 541   struct named_section GTY ((tag ("SECTION_NAMED"))) named;
 542   struct unnamed_section GTY ((tag ("SECTION_UNNAMED"))) unnamed;
 543   struct noswitch_section GTY ((tag ("SECTION_NOSWITCH"))) noswitch;
 544 };
 545
 546 /* Return the style of section SECT.  */
 547 #define SECTION_STYLE(SECT) ((SECT)->common.flags & SECTION_STYLE_MASK)
 548
 549 struct object_block;
 550
 551 /* Special well-known sections.  */
 552 extern GTY(()) section *text_section;
 553 extern GTY(()) section *data_section;
 554 extern GTY(()) section *readonly_data_section;
 555 extern GTY(()) section *sdata_section;
 556 extern GTY(()) section *ctors_section;
 557 extern GTY(()) section *dtors_section;
 558 extern GTY(()) section *bss_section;
 559 extern GTY(()) section *sbss_section;
 560 extern GTY(()) section *exception_section;
 561 extern GTY(()) section *eh_frame_section;
 562 extern GTY(()) section *tls_comm_section;
 563 extern GTY(()) section *comm_section;
 564 extern GTY(()) section *lcomm_section;
 565 extern GTY(()) section *bss_noswitch_section;
 566
 567 extern GTY(()) section *in_section;
 568 extern GTY(()) bool in_cold_section_p;
 569
 570 extern section *get_unnamed_section (unsigned int, void (*) (const void *),
 571                                      const void *);
 572 extern section *get_section (const char *, unsigned int, tree);
 573 extern section *get_named_section (tree, const char *, int);
 574 extern void place_block_symbol (rtx);
 575 extern rtx get_section_anchor (struct object_block *, HOST_WIDE_INT,
 576                                enum tls_model);
 577 extern section *mergeable_constant_section (enum machine_mode,
 578                                             unsigned HOST_WIDE_INT,
 579                                             unsigned int);
 580 extern section *function_section (tree);
 581 extern section *unlikely_text_section (void);
 582 extern section *current_function_section (void);
 583
 584 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
 585    not) section for PRIORITY.  */
 586 extern section *get_cdtor_priority_section (int, bool);
 587
 588 extern bool unlikely_text_section_p (section *);
 589 extern void switch_to_section (section *);
 590 extern void output_section_asm_op (const void *);
 591
 592 extern void default_asm_output_source_filename (FILE *, const char *);
 593 extern void output_file_directive (FILE *, const char *);
 594
 595 extern unsigned int default_section_type_flags (tree, const char *, int);
 596
 597 extern bool have_global_bss_p (void);
 598 extern void default_no_named_section (const char *, unsigned int, tree);
 599 extern void default_elf_asm_named_section (const char *, unsigned int, tree);
 600 extern enum section_category categorize_decl_for_section (const_tree, int);
 601 extern void default_coff_asm_named_section (const char *, unsigned int, tree);
 602 extern void default_pe_asm_named_section (const char *, unsigned int, tree);
 603
 604 extern void default_stabs_asm_out_destructor (rtx, int);
 605 extern void default_named_section_asm_out_destructor (rtx, int);
 606 extern void default_dtor_section_asm_out_destructor (rtx, int);
 607 extern void default_stabs_asm_out_constructor (rtx, int);
 608 extern void default_named_section_asm_out_constructor (rtx, int);
 609 extern void default_ctor_section_asm_out_constructor (rtx, int);
 610
 611 extern section *default_select_section (tree, int, unsigned HOST_WIDE_INT);
 612 extern section *default_elf_select_section (tree, int, unsigned HOST_WIDE_INT);
 613 extern void default_unique_section (tree, int);
 614 extern section *default_function_rodata_section (tree);
 615 extern section *default_no_function_rodata_section (tree);
 616 extern section *default_select_rtx_section (enum machine_mode, rtx,
 617                                             unsigned HOST_WIDE_INT);
 618 extern section *default_elf_select_rtx_section (enum machine_mode, rtx,
 619                                                 unsigned HOST_WIDE_INT);
 620 extern void default_encode_section_info (tree, rtx, int);
 621 extern const char *default_strip_name_encoding (const char *);
 622 extern void default_asm_output_anchor (rtx);
 623 extern bool default_use_anchors_for_symbol_p (const_rtx);
 624 extern bool default_binds_local_p (const_tree);
 625 extern bool default_binds_local_p_1 (const_tree, int);
 626 extern void default_globalize_label (FILE *, const char *);
 627 extern void default_globalize_decl_name (FILE *, tree);
 628 extern void default_emit_unwind_label (FILE *, tree, int, int);
 629 extern void default_emit_except_table_label (FILE *);
 630 extern void default_internal_label (FILE *, const char *, unsigned long);
 631 extern void default_asm_declare_constant_name (FILE *, const char *,
 632                                                const_tree, HOST_WIDE_INT);
 633 extern void default_file_start (void);
 634 extern void file_end_indicate_exec_stack (void);
 635 extern void file_end_indicate_split_stack (void);
 636
 637 extern void default_elf_asm_output_external (FILE *file, tree,
 638                                              const char *);
 639 extern int maybe_assemble_visibility (tree);
 640
 641 extern int default_address_cost (rtx, bool);
 642
 643 /* Output stack usage information.  */
 644 extern void output_stack_usage (void);
 645
 646 /* dbxout helper functions */
 647 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
 648
 649 extern void dbxout_int (int);
 650 extern void dbxout_stabd (int, int);
 651 extern void dbxout_begin_stabn (int);
 652 extern void dbxout_begin_stabn_sline (int);
 653 extern void dbxout_begin_empty_stabs (int);
 654 extern void dbxout_begin_simple_stabs (const char *, int);
 655 extern void dbxout_begin_simple_stabs_desc (const char *, int, int);
 656
 657 extern void dbxout_stab_value_zero (void);
 658 extern void dbxout_stab_value_label (const char *);
 659 extern void dbxout_stab_value_label_diff (const char *, const char *);
 660 extern void dbxout_stab_value_internal_label (const char *, int *);
 661 extern void dbxout_stab_value_internal_label_diff (const char *, int *,
 662                                                    const char *);
 663
 664 #endif
 665
 666 #endif /* ! GCC_OUTPUT_H */