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 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 3, 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 COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_OUTPUT_H
  23 #define GCC_OUTPUT_H
  24
  25 /* Initialize data in final at the beginning of a compilation.  */
  26 extern void init_final (const char *);
  27
  28 /* Enable APP processing of subsequent output.
  29    Used before the output from an `asm' statement.  */
  30 extern void app_enable (void);
  31
  32 /* Disable APP processing of subsequent output.
  33    Called from varasm.c before most kinds of output.  */
  34 extern void app_disable (void);
  35
  36 /* Return the number of slots filled in the current
  37    delayed branch sequence (we don't count the insn needing the
  38    delay slot).   Zero if not in a delayed branch sequence.  */
  39 extern int dbr_sequence_length (void);
  40
  41 /* Indicate that branch shortening hasn't yet been done.  */
  42 extern void init_insn_lengths (void);
  43
  44 /* Obtain the current length of an insn.  If branch shortening has been done,
  45    get its actual length.  Otherwise, get its maximum length.  */
  46 extern int get_attr_length (rtx);
  47
  48 /* Obtain the current length of an insn.  If branch shortening has been done,
  49    get its actual length.  Otherwise, get its minimum length.  */
  50 extern int get_attr_min_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);
  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 *);
  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 /* Find the alignment maximum skip associated with a CODE_LABEL.
  98    Defined in final.c.  */
  99 extern int label_to_max_skip (rtx);
 100
 101 /* Output a LABEL_REF, or a bare CODE_LABEL, as an assembler symbol.  */
 102 extern void output_asm_label (rtx);
 103
 104 /* Marks SYMBOL_REFs in x as referenced through use of assemble_external.  */
 105 extern void mark_symbol_refs_as_used (rtx);
 106
 107 /* Print a memory reference operand for address X
 108    using machine-dependent assembler syntax.  */
 109 extern void output_address (rtx);
 110
 111 /* Print an integer constant expression in assembler syntax.
 112    Addition and subtraction are the only arithmetic
 113    that may appear in these expressions.  */
 114 extern void output_addr_const (FILE *, rtx);
 115
 116 /* Output a string of assembler code, substituting numbers, strings
 117    and fixed syntactic prefixes.  */
 118 #if GCC_VERSION >= 3004
 119 #define ATTRIBUTE_ASM_FPRINTF(m, n) __attribute__ ((__format__ (__asm_fprintf__, m, n))) ATTRIBUTE_NONNULL(m)
 120 /* This is a magic identifier which allows GCC to figure out the type
 121    of HOST_WIDE_INT for %wd specifier checks.  You must issue this
 122    typedef before using the __asm_fprintf__ format attribute.  */
 123 typedef HOST_WIDE_INT __gcc_host_wide_int__;
 124 #else
 125 #define ATTRIBUTE_ASM_FPRINTF(m, n) ATTRIBUTE_NONNULL(m)
 126 #endif
 127
 128 extern void asm_fprintf (FILE *file, const char *p, ...)
 129      ATTRIBUTE_ASM_FPRINTF(2, 3);
 130
 131 /* Split up a CONST_DOUBLE or integer constant rtx into two rtx's for single
 132    words.  */
 133 extern void split_double (rtx, rtx *, rtx *);
 134
 135 /* Return nonzero if this function has no function calls.  */
 136 extern int leaf_function_p (void);
 137
 138 /* Return 1 if branch is a forward branch.
 139    Uses insn_shuid array, so it works only in the final pass.  May be used by
 140    output templates to add branch prediction hints, for example.  */
 141 extern int final_forward_branch_p (rtx);
 142
 143 /* Return 1 if this function uses only the registers that can be
 144    safely renumbered.  */
 145 extern int only_leaf_regs_used (void);
 146
 147 /* Scan IN_RTX and its subexpressions, and renumber all regs into those
 148    available in leaf functions.  */
 149 extern void leaf_renumber_regs_insn (rtx);
 150
 151 /* Locate the proper template for the given insn-code.  */
 152 extern const char *get_insn_template (int, rtx);
 153
 154 /* Functions in varasm.c.  */
 155
 156 /* Declare DECL to be a weak symbol.  */
 157 extern void declare_weak (tree);
 158 /* Merge weak status.  */
 159 extern void merge_weak (tree, tree);
 160
 161 /* Emit any pending weak declarations.  */
 162 extern void weak_finish (void);
 163
 164 /* Emit any pending emutls declarations and initializations.  */
 165 extern void emutls_finish (void);
 166
 167 /* Decode an `asm' spec for a declaration as a register name.
 168    Return the register number, or -1 if nothing specified,
 169    or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
 170    or -3 if ASMSPEC is `cc' and is not recognized,
 171    or -4 if ASMSPEC is `memory' and is not recognized.
 172    Accept an exact spelling or a decimal number.
 173    Prefixes such as % are optional.  */
 174 extern int decode_reg_name (const char *);
 175
 176 extern void assemble_alias (tree, tree);
 177
 178 extern void default_assemble_visibility (tree, int);
 179
 180 /* Output a string of literal assembler code
 181    for an `asm' keyword used between functions.  */
 182 extern void assemble_asm (tree);
 183
 184 /* Output assembler code for the constant pool of a function and associated
 185    with defining the name of the function.  DECL describes the function.
 186    NAME is the function's name.  For the constant pool, we use the current
 187    constant pool data.  */
 188 extern void assemble_start_function (tree, const char *);
 189
 190 /* Output assembler code associated with defining the size of the
 191    function.  DECL describes the function.  NAME is the function's name.  */
 192 extern void assemble_end_function (tree, const char *);
 193
 194 /* Assemble everything that is needed for a variable or function declaration.
 195    Not used for automatic variables, and not used for function definitions.
 196    Should not be called for variables of incomplete structure type.
 197
 198    TOP_LEVEL is nonzero if this variable has file scope.
 199    AT_END is nonzero if this is the special handling, at end of compilation,
 200    to define things that have had only tentative definitions.
 201    DONT_OUTPUT_DATA if nonzero means don't actually output the
 202    initial value (that will be done by the caller).  */
 203 extern void assemble_variable (tree, int, int, int);
 204
 205 /* Compute the alignment of variable specified by DECL.
 206    DONT_OUTPUT_DATA is from assemble_variable.  */
 207 extern void align_variable (tree decl, bool dont_output_data);
 208
 209 /* Queue for outputting something to declare an external symbol to the
 210    assembler.  (Most assemblers don't need this, so we normally output
 211    nothing.)  Do nothing if DECL is not external.  */
 212 extern void assemble_external (tree);
 213
 214 /* Assemble code to leave SIZE bytes of zeros.  */
 215 extern void assemble_zeros (unsigned HOST_WIDE_INT);
 216
 217 /* Assemble an alignment pseudo op for an ALIGN-bit boundary.  */
 218 extern void assemble_align (int);
 219
 220 /* Assemble a string constant with the specified C string as contents.  */
 221 extern void assemble_string (const char *, int);
 222
 223 /* Similar, for calling a library function FUN.  */
 224 extern void assemble_external_libcall (rtx);
 225
 226 /* Assemble a label named NAME.  */
 227 extern void assemble_label (const char *);
 228
 229 /* Output to FILE (an assembly file) a reference to NAME.  If NAME
 230    starts with a *, the rest of NAME is output verbatim.  Otherwise
 231    NAME is transformed in a target-specific way (usually by the
 232    addition of an underscore).  */
 233 extern void assemble_name_raw (FILE *, const char *);
 234
 235 /* Like assemble_name_raw, but should be used when NAME might refer to
 236    an entity that is also represented as a tree (like a function or
 237    variable).  If NAME does refer to such an entity, that entity will
 238    be marked as referenced.  */
 239 extern void assemble_name (FILE *, const char *);
 240
 241 /* Return the assembler directive for creating a given kind of integer
 242    object.  SIZE is the number of bytes in the object and ALIGNED_P
 243    indicates whether it is known to be aligned.  Return NULL if the
 244    assembly dialect has no such directive.
 245
 246    The returned string should be printed at the start of a new line and
 247    be followed immediately by the object's initial value.  */
 248 extern const char *integer_asm_op (int, int);
 249
 250 /* Use directive OP to assemble an integer object X.  Print OP at the
 251    start of the line, followed immediately by the value of X.  */
 252 extern void assemble_integer_with_op (const char *, rtx);
 253
 254 /* The default implementation of the asm_out.integer target hook.  */
 255 extern bool default_assemble_integer (rtx, unsigned int, int);
 256
 257 /* Assemble the integer constant X into an object of SIZE bytes.  ALIGN is
 258    the alignment of the integer in bits.  Return 1 if we were able to output
 259    the constant, otherwise 0.  If FORCE is nonzero the constant must
 260    be outputable. */
 261 extern bool assemble_integer (rtx, unsigned, unsigned, int);
 262
 263 /* An interface to assemble_integer for the common case in which a value is
 264    fully aligned and must be printed.  VALUE is the value of the integer
 265    object and SIZE is the number of bytes it contains.  */
 266 #define assemble_aligned_integer(SIZE, VALUE) \
 267   assemble_integer (VALUE, SIZE, (SIZE) * BITS_PER_UNIT, 1)
 268
 269 #ifdef REAL_VALUE_TYPE_SIZE
 270 /* Assemble the floating-point constant D into an object of size MODE.  */
 271 extern void assemble_real (REAL_VALUE_TYPE, enum machine_mode, unsigned);
 272 #endif
 273
 274 /* Write the address of the entity given by SYMBOL to SEC.  */
 275 extern void assemble_addr_to_section (rtx, section *);
 276
 277 /* Return the size of the constant pool.  */
 278 extern int get_pool_size (void);
 279
 280 #ifdef HAVE_peephole
 281 extern rtx peephole (rtx);
 282 #endif
 283
 284 extern void output_shared_constant_pool (void);
 285
 286 extern void output_object_blocks (void);
 287
 288 /* Whether a constructor CTOR is a valid static constant initializer if all
 289    its elements are.  This used to be internal to initializer_constant_valid_p
 290    and has been exposed to let other functions like categorize_ctor_elements
 291    evaluate the property while walking a constructor for other purposes.  */
 292
 293 extern bool constructor_static_from_elts_p (const_tree);
 294
 295 /* Return nonzero if VALUE is a valid constant-valued expression
 296    for use in initializing a static variable; one that can be an
 297    element of a "constant" initializer.
 298
 299    Return null_pointer_node if the value is absolute;
 300    if it is relocatable, return the variable that determines the relocation.
 301    We assume that VALUE has been folded as much as possible;
 302    therefore, we do not need to check for such things as
 303    arithmetic-combinations of integers.  */
 304 extern tree initializer_constant_valid_p (tree, tree);
 305
 306 /* Return true if VALUE is a valid constant-valued expression
 307    for use in initializing a static bit-field; one that can be
 308    an element of a "constant" initializer.  */
 309 extern bool initializer_constant_valid_for_bitfield_p (tree);
 310
 311 /* Output assembler code for constant EXP to FILE, with no label.
 312    This includes the pseudo-op such as ".int" or ".byte", and a newline.
 313    Assumes output_addressed_constants has been done on EXP already.
 314
 315    Generate exactly SIZE bytes of assembler data, padding at the end
 316    with zeros if necessary.  SIZE must always be specified.
 317
 318    ALIGN is the alignment in bits that may be assumed for the data.  */
 319 extern void output_constant (tree, unsigned HOST_WIDE_INT, unsigned int);
 320
 321 /* When outputting delayed branch sequences, this rtx holds the
 322    sequence being output.  It is null when no delayed branch
 323    sequence is being output, so it can be used as a test in the
 324    insn output code.
 325
 326    This variable is defined  in final.c.  */
 327 extern rtx final_sequence;
 328
 329 /* The line number of the beginning of the current function.  Various
 330    md code needs this so that it can output relative linenumbers.  */
 331
 332 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers.  */
 333 extern int sdb_begin_function_line;
 334 #endif
 335
 336 /* File in which assembler code is being written.  */
 337
 338 #ifdef BUFSIZ
 339 extern FILE *asm_out_file;
 340 extern FILE *graphite_out_file;
 341 extern FILE *graphite_in_file;
 342 #endif
 343
 344 /* The first global object in the file.  */
 345 extern const char *first_global_object_name;
 346
 347 /* The first weak object in the file.  */
 348 extern const char *weak_global_object_name;
 349
 350 /* Nonzero if function being compiled doesn't contain any calls
 351    (ignoring the prologue and epilogue).  This is set prior to
 352    local register allocation and is valid for the remaining
 353    compiler passes.  */
 354
 355 extern int current_function_is_leaf;
 356
 357 /* Nonzero if function being compiled doesn't modify the stack pointer
 358    (ignoring the prologue and epilogue).  This is only valid after
 359    pass_stack_ptr_mod has run.  */
 360
 361 extern int current_function_sp_is_unchanging;
 362
 363 /* Nonzero if the function being compiled is a leaf function which only
 364    uses leaf registers.  This is valid after reload (specifically after
 365    sched2) and is useful only if the port defines LEAF_REGISTERS.  */
 366
 367 extern int current_function_uses_only_leaf_regs;
 368
 369 /* Default file in which to dump debug output.  */
 370
 371 #ifdef BUFSIZ
 372 extern FILE *dump_file;
 373 #endif
 374
 375 /* Nonnull if the insn currently being emitted was a COND_EXEC pattern.  */
 376 extern rtx current_insn_predicate;
 377
 378 /* Last insn processed by final_scan_insn.  */
 379 extern rtx current_output_insn;
 380
 381 /* Nonzero while outputting an `asm' with operands.
 382    This means that inconsistencies are the user's fault, so don't die.
 383    The precise value is the insn being output, to pass to error_for_asm.  */
 384 extern rtx this_is_asm_operands;
 385
 386 /* Carry information from ASM_DECLARE_OBJECT_NAME
 387    to ASM_FINISH_DECLARE_OBJECT.  */
 388 extern int size_directive_output;
 389 extern tree last_assemble_variable_decl;
 390
 391 extern bool first_function_block_is_cold;
 392
 393 /* Decide whether DECL needs to be in a writable section.
 394    RELOC is the same as for SELECT_SECTION.  */
 395 extern bool decl_readonly_section (const_tree, int);
 396
 397 /* This can be used to compute RELOC for the function above, when
 398    given a constant expression.  */
 399 extern int compute_reloc_for_constant (tree);
 400
 401 /* User label prefix in effect for this compilation.  */
 402 extern const char *user_label_prefix;
 403
 404 /* Default target function prologue and epilogue assembler output.  */
 405 extern void default_function_pro_epilogue (FILE *, HOST_WIDE_INT);
 406
 407 /* Default target hook that outputs nothing to a stream.  */
 408 extern void no_asm_to_stream (FILE *);
 409
 410 /* Flags controlling properties of a section.  */
 411 #define SECTION_ENTSIZE  0x000ff        /* entity size in section */
 412 #define SECTION_CODE     0x00100        /* contains code */
 413 #define SECTION_WRITE    0x00200        /* data is writable */
 414 #define SECTION_DEBUG    0x00400        /* contains debug data */
 415 #define SECTION_LINKONCE 0x00800        /* is linkonce */
 416 #define SECTION_SMALL    0x01000        /* contains "small data" */
 417 #define SECTION_BSS      0x02000        /* contains zeros only */
 418 #define SECTION_FORGET   0x04000        /* forget that we've entered the section */
 419 #define SECTION_MERGE    0x08000        /* contains mergeable data */
 420 #define SECTION_STRINGS  0x10000        /* contains zero terminated strings without
 421                                            embedded zeros */
 422 #define SECTION_OVERRIDE 0x20000        /* allow override of default flags */
 423 #define SECTION_TLS      0x40000        /* contains thread-local storage */
 424 #define SECTION_NOTYPE   0x80000        /* don't output @progbits */
 425 #define SECTION_DECLARED 0x100000       /* section has been used */
 426 #define SECTION_STYLE_MASK 0x600000     /* bits used for SECTION_STYLE */
 427 #define SECTION_COMMON   0x800000       /* contains common data */
 428 #define SECTION_MACH_DEP 0x1000000      /* subsequent bits reserved for target */
 429
 430 /* This SECTION_STYLE is used for unnamed sections that we can switch
 431    to using a special assembler directive.  */
 432 #define SECTION_UNNAMED  0x000000
 433
 434 /* This SECTION_STYLE is used for named sections that we can switch
 435    to using a general section directive.  */
 436 #define SECTION_NAMED    0x200000
 437
 438 /* This SECTION_STYLE is used for sections that we cannot switch to at
 439    all.  The choice of section is implied by the directive that we use
 440    to declare the object.  */
 441 #define SECTION_NOSWITCH 0x400000
 442
 443 /* A helper function for default_elf_select_section and
 444    default_elf_unique_section.  Categorizes the DECL.  */
 445
 446 enum section_category
 447 {
 448   SECCAT_TEXT,
 449
 450   SECCAT_RODATA,
 451   SECCAT_RODATA_MERGE_STR,
 452   SECCAT_RODATA_MERGE_STR_INIT,
 453   SECCAT_RODATA_MERGE_CONST,
 454   SECCAT_SRODATA,
 455
 456   SECCAT_DATA,
 457
 458   /* To optimize loading of shared programs, define following subsections
 459      of data section:
 460         _REL    Contains data that has relocations, so they get grouped
 461                 together and dynamic linker will visit fewer pages in memory.
 462         _RO     Contains data that is otherwise read-only.  This is useful
 463                 with prelinking as most relocations won't be dynamically
 464                 linked and thus stay read only.
 465         _LOCAL  Marks data containing relocations only to local objects.
 466                 These relocations will get fully resolved by prelinking.  */
 467   SECCAT_DATA_REL,
 468   SECCAT_DATA_REL_LOCAL,
 469   SECCAT_DATA_REL_RO,
 470   SECCAT_DATA_REL_RO_LOCAL,
 471
 472   SECCAT_SDATA,
 473   SECCAT_TDATA,
 474
 475   SECCAT_BSS,
 476   SECCAT_SBSS,
 477   SECCAT_TBSS,
 478
 479   SECCAT_EMUTLS_VAR,
 480   SECCAT_EMUTLS_TMPL
 481 };
 482
 483 /* Information that is provided by all instances of the section type.  */
 484 struct GTY(()) section_common {
 485   /* The set of SECTION_* flags that apply to this section.  */
 486   unsigned int flags;
 487 };
 488
 489 /* Information about a SECTION_NAMED section.  */
 490 struct GTY(()) named_section {
 491   struct section_common common;
 492
 493   /* The name of the section.  */
 494   const char *name;
 495
 496   /* If nonnull, the VAR_DECL or FUNCTION_DECL with which the
 497      section is associated.  */
 498   tree decl;
 499 };
 500
 501 /* A callback that writes the assembly code for switching to an unnamed
 502    section.  The argument provides callback-specific data.  */
 503 typedef void (*unnamed_section_callback) (const void *);
 504
 505 /* Information about a SECTION_UNNAMED section.  */
 506 struct GTY(()) unnamed_section {
 507   struct section_common common;
 508
 509   /* The callback used to switch to the section, and the data that
 510      should be passed to the callback.  */
 511   unnamed_section_callback GTY ((skip)) callback;
 512   const void *GTY ((skip)) data;
 513
 514   /* The next entry in the chain of unnamed sections.  */
 515   section *next;
 516 };
 517
 518 /* A callback that writes the assembly code for a decl in a
 519    SECTION_NOSWITCH section.  DECL is the decl that should be assembled
 520    and NAME is the name of its SYMBOL_REF.  SIZE is the size of the decl
 521    in bytes and ROUNDED is that size rounded up to the next
 522    BIGGEST_ALIGNMENT / BITS_PER_UNIT boundary.
 523
 524    Return true if the callback used DECL_ALIGN to set the object's
 525    alignment.  A false return value implies that we are relying
 526    on the rounded size to align the decl.  */
 527 typedef bool (*noswitch_section_callback) (tree decl, const char *name,
 528                                            unsigned HOST_WIDE_INT size,
 529                                            unsigned HOST_WIDE_INT rounded);
 530
 531 /* Information about a SECTION_NOSWITCH section.  */
 532 struct GTY(()) noswitch_section {
 533   struct section_common common;
 534
 535   /* The callback used to assemble decls in this section.  */
 536   noswitch_section_callback GTY ((skip)) callback;
 537 };
 538
 539 /* Information about a section, which may be named or unnamed.  */
 540 union GTY ((desc ("SECTION_STYLE (&(%h))"))) section {
 541   struct section_common GTY ((skip)) common;
 542   struct named_section GTY ((tag ("SECTION_NAMED"))) named;
 543   struct unnamed_section GTY ((tag ("SECTION_UNNAMED"))) unnamed;
 544   struct noswitch_section GTY ((tag ("SECTION_NOSWITCH"))) noswitch;
 545 };
 546
 547 /* Return the style of section SECT.  */
 548 #define SECTION_STYLE(SECT) ((SECT)->common.flags & SECTION_STYLE_MASK)
 549
 550 struct object_block;
 551
 552 /* Special well-known sections.  */
 553 extern GTY(()) section *text_section;
 554 extern GTY(()) section *data_section;
 555 extern GTY(()) section *readonly_data_section;
 556 extern GTY(()) section *sdata_section;
 557 extern GTY(()) section *ctors_section;
 558 extern GTY(()) section *dtors_section;
 559 extern GTY(()) section *bss_section;
 560 extern GTY(()) section *sbss_section;
 561 extern GTY(()) section *exception_section;
 562 extern GTY(()) section *eh_frame_section;
 563 extern GTY(()) section *tls_comm_section;
 564 extern GTY(()) section *comm_section;
 565 extern GTY(()) section *lcomm_section;
 566 extern GTY(()) section *bss_noswitch_section;
 567
 568 extern GTY(()) section *in_section;
 569 extern GTY(()) bool in_cold_section_p;
 570
 571 extern section *get_unnamed_section (unsigned int, void (*) (const void *),
 572                                      const void *);
 573 extern section *get_section (const char *, unsigned int, tree);
 574 extern section *get_named_section (tree, const char *, int);
 575 extern void place_block_symbol (rtx);
 576 extern rtx get_section_anchor (struct object_block *, HOST_WIDE_INT,
 577                                enum tls_model);
 578 extern section *mergeable_constant_section (enum machine_mode,
 579                                             unsigned HOST_WIDE_INT,
 580                                             unsigned int);
 581 extern section *function_section (tree);
 582 extern section *unlikely_text_section (void);
 583 extern section *current_function_section (void);
 584
 585 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
 586    not) section for PRIORITY.  */
 587 extern section *get_cdtor_priority_section (int, bool);
 588
 589 extern bool unlikely_text_section_p (section *);
 590 extern void switch_to_section (section *);
 591 extern void output_section_asm_op (const void *);
 592
 593 extern unsigned int default_section_type_flags (tree, const char *, int);
 594
 595 extern bool have_global_bss_p (void);
 596 extern void default_no_named_section (const char *, unsigned int, tree);
 597 extern void default_elf_asm_named_section (const char *, unsigned int, tree);
 598 extern enum section_category categorize_decl_for_section (const_tree, int);
 599 extern void default_coff_asm_named_section (const char *, unsigned int, tree);
 600 extern void default_pe_asm_named_section (const char *, unsigned int, tree);
 601
 602 extern void default_stabs_asm_out_destructor (rtx, int);
 603 extern void default_named_section_asm_out_destructor (rtx, int);
 604 extern void default_dtor_section_asm_out_destructor (rtx, int);
 605 extern void default_stabs_asm_out_constructor (rtx, int);
 606 extern void default_named_section_asm_out_constructor (rtx, int);
 607 extern void default_ctor_section_asm_out_constructor (rtx, int);
 608
 609 extern section *default_select_section (tree, int, unsigned HOST_WIDE_INT);
 610 extern section *default_elf_select_section (tree, int, unsigned HOST_WIDE_INT);
 611 extern void default_unique_section (tree, int);
 612 extern section *default_function_rodata_section (tree);
 613 extern section *default_no_function_rodata_section (tree);
 614 extern section *default_select_rtx_section (enum machine_mode, rtx,
 615                                             unsigned HOST_WIDE_INT);
 616 extern section *default_elf_select_rtx_section (enum machine_mode, rtx,
 617                                                 unsigned HOST_WIDE_INT);
 618 extern void default_encode_section_info (tree, rtx, int);
 619 extern const char *default_strip_name_encoding (const char *);
 620 extern void default_asm_output_anchor (rtx);
 621 extern bool default_use_anchors_for_symbol_p (const_rtx);
 622 extern bool default_binds_local_p (const_tree);
 623 extern bool default_binds_local_p_1 (const_tree, int);
 624 extern void default_globalize_label (FILE *, const char *);
 625 extern void default_globalize_decl_name (FILE *, tree);
 626 extern void default_emit_unwind_label (FILE *, tree, int, int);
 627 extern void default_emit_except_table_label (FILE *);
 628 extern void default_internal_label (FILE *, const char *, unsigned long);
 629 extern void default_file_start (void);
 630 extern void file_end_indicate_exec_stack (void);
 631
 632 extern void default_elf_asm_output_external (FILE *file, tree,
 633                                              const char *);
 634 extern int maybe_assemble_visibility (tree);
 635
 636 extern int default_address_cost (rtx, bool);
 637
 638 /* dbxout helper functions */
 639 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
 640
 641 extern void dbxout_int (int);
 642 extern void dbxout_stabd (int, int);
 643 extern void dbxout_begin_stabn (int);
 644 extern void dbxout_begin_stabn_sline (int);
 645 extern void dbxout_begin_empty_stabs (int);
 646 extern void dbxout_begin_simple_stabs (const char *, int);
 647 extern void dbxout_begin_simple_stabs_desc (const char *, int, int);
 648
 649 extern void dbxout_stab_value_zero (void);
 650 extern void dbxout_stab_value_label (const char *);
 651 extern void dbxout_stab_value_label_diff (const char *, const char *);
 652 extern void dbxout_stab_value_internal_label (const char *, int *);
 653 extern void dbxout_stab_value_internal_label_diff (const char *, int *,
 654                                                    const char *);
 655
 656 #endif
 657
 658 #endif /* ! GCC_OUTPUT_H */