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 /* Emit any pending emutls declarations and initializations.  */
 169 extern void emutls_finish (void);
 170
 171 /* Return the default TLS model for a given variable.  */
 172 extern enum tls_model decl_default_tls_model (const_tree);
 173
 174 /* Decode an `asm' spec for a declaration as a register name.
 175    Return the register number, or -1 if nothing specified,
 176    or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
 177    or -3 if ASMSPEC is `cc' and is not recognized,
 178    or -4 if ASMSPEC is `memory' and is not recognized.
 179    Accept an exact spelling or a decimal number.
 180    Prefixes such as % are optional.  */
 181 extern int decode_reg_name (const char *);
 182
 183 extern void assemble_alias (tree, tree);
 184
 185 extern void default_assemble_visibility (tree, int);
 186
 187 /* Output a string of literal assembler code
 188    for an `asm' keyword used between functions.  */
 189 extern void assemble_asm (tree);
 190
 191 /* Output assembler code for the constant pool of a function and associated
 192    with defining the name of the function.  DECL describes the function.
 193    NAME is the function's name.  For the constant pool, we use the current
 194    constant pool data.  */
 195 extern void assemble_start_function (tree, const char *);
 196
 197 /* Output assembler code associated with defining the size of the
 198    function.  DECL describes the function.  NAME is the function's name.  */
 199 extern void assemble_end_function (tree, const char *);
 200
 201 /* Assemble everything that is needed for a variable or function declaration.
 202    Not used for automatic variables, and not used for function definitions.
 203    Should not be called for variables of incomplete structure type.
 204
 205    TOP_LEVEL is nonzero if this variable has file scope.
 206    AT_END is nonzero if this is the special handling, at end of compilation,
 207    to define things that have had only tentative definitions.
 208    DONT_OUTPUT_DATA if nonzero means don't actually output the
 209    initial value (that will be done by the caller).  */
 210 extern void assemble_variable (tree, int, int, int);
 211
 212 /* Compute the alignment of variable specified by DECL.
 213    DONT_OUTPUT_DATA is from assemble_variable.  */
 214 extern void align_variable (tree decl, bool dont_output_data);
 215
 216 /* Queue for outputting something to declare an external symbol to the
 217    assembler.  (Most assemblers don't need this, so we normally output
 218    nothing.)  Do nothing if DECL is not external.  */
 219 extern void assemble_external (tree);
 220
 221 /* Assemble code to leave SIZE bytes of zeros.  */
 222 extern void assemble_zeros (unsigned HOST_WIDE_INT);
 223
 224 /* Assemble an alignment pseudo op for an ALIGN-bit boundary.  */
 225 extern void assemble_align (int);
 226
 227 /* Assemble a string constant with the specified C string as contents.  */
 228 extern void assemble_string (const char *, int);
 229
 230 /* Similar, for calling a library function FUN.  */
 231 extern void assemble_external_libcall (rtx);
 232
 233 /* Assemble a label named NAME.  */
 234 extern void assemble_label (FILE *, const char *);
 235
 236 /* Output to FILE (an assembly file) a reference to NAME.  If NAME
 237    starts with a *, the rest of NAME is output verbatim.  Otherwise
 238    NAME is transformed in a target-specific way (usually by the
 239    addition of an underscore).  */
 240 extern void assemble_name_raw (FILE *, const char *);
 241
 242 /* Like assemble_name_raw, but should be used when NAME might refer to
 243    an entity that is also represented as a tree (like a function or
 244    variable).  If NAME does refer to such an entity, that entity will
 245    be marked as referenced.  */
 246 extern void assemble_name (FILE *, const char *);
 247
 248 /* Return the assembler directive for creating a given kind of integer
 249    object.  SIZE is the number of bytes in the object and ALIGNED_P
 250    indicates whether it is known to be aligned.  Return NULL if the
 251    assembly dialect has no such directive.
 252
 253    The returned string should be printed at the start of a new line and
 254    be followed immediately by the object's initial value.  */
 255 extern const char *integer_asm_op (int, int);
 256
 257 /* Use directive OP to assemble an integer object X.  Print OP at the
 258    start of the line, followed immediately by the value of X.  */
 259 extern void assemble_integer_with_op (const char *, rtx);
 260
 261 /* The default implementation of the asm_out.integer target hook.  */
 262 extern bool default_assemble_integer (rtx, unsigned int, int);
 263
 264 /* Assemble the integer constant X into an object of SIZE bytes.  ALIGN is
 265    the alignment of the integer in bits.  Return 1 if we were able to output
 266    the constant, otherwise 0.  If FORCE is nonzero the constant must
 267    be outputable. */
 268 extern bool assemble_integer (rtx, unsigned, unsigned, int);
 269
 270 /* An interface to assemble_integer for the common case in which a value is
 271    fully aligned and must be printed.  VALUE is the value of the integer
 272    object and SIZE is the number of bytes it contains.  */
 273 #define assemble_aligned_integer(SIZE, VALUE) \
 274   assemble_integer (VALUE, SIZE, (SIZE) * BITS_PER_UNIT, 1)
 275
 276 #ifdef REAL_VALUE_TYPE_SIZE
 277 /* Assemble the floating-point constant D into an object of size MODE.  */
 278 extern void assemble_real (REAL_VALUE_TYPE, enum machine_mode, unsigned);
 279 #endif
 280
 281 /* Write the address of the entity given by SYMBOL to SEC.  */
 282 extern void assemble_addr_to_section (rtx, section *);
 283
 284 /* Return the size of the constant pool.  */
 285 extern int get_pool_size (void);
 286
 287 #ifdef HAVE_peephole
 288 extern rtx peephole (rtx);
 289 #endif
 290
 291 extern void output_shared_constant_pool (void);
 292
 293 extern void output_object_blocks (void);
 294
 295 /* Whether a constructor CTOR is a valid static constant initializer if all
 296    its elements are.  This used to be internal to initializer_constant_valid_p
 297    and has been exposed to let other functions like categorize_ctor_elements
 298    evaluate the property while walking a constructor for other purposes.  */
 299
 300 extern bool constructor_static_from_elts_p (const_tree);
 301
 302 /* Return nonzero if VALUE is a valid constant-valued expression
 303    for use in initializing a static variable; one that can be an
 304    element of a "constant" initializer.
 305
 306    Return null_pointer_node if the value is absolute;
 307    if it is relocatable, return the variable that determines the relocation.
 308    We assume that VALUE has been folded as much as possible;
 309    therefore, we do not need to check for such things as
 310    arithmetic-combinations of integers.  */
 311 extern tree initializer_constant_valid_p (tree, tree);
 312
 313 /* Return true if VALUE is a valid constant-valued expression
 314    for use in initializing a static bit-field; one that can be
 315    an element of a "constant" initializer.  */
 316 extern bool initializer_constant_valid_for_bitfield_p (tree);
 317
 318 /* Output assembler code for constant EXP to FILE, with no label.
 319    This includes the pseudo-op such as ".int" or ".byte", and a newline.
 320    Assumes output_addressed_constants has been done on EXP already.
 321
 322    Generate exactly SIZE bytes of assembler data, padding at the end
 323    with zeros if necessary.  SIZE must always be specified.
 324
 325    ALIGN is the alignment in bits that may be assumed for the data.  */
 326 extern void output_constant (tree, unsigned HOST_WIDE_INT, unsigned int);
 327
 328 /* When outputting delayed branch sequences, this rtx holds the
 329    sequence being output.  It is null when no delayed branch
 330    sequence is being output, so it can be used as a test in the
 331    insn output code.
 332
 333    This variable is defined  in final.c.  */
 334 extern rtx final_sequence;
 335
 336 /* The line number of the beginning of the current function.  Various
 337    md code needs this so that it can output relative linenumbers.  */
 338
 339 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers.  */
 340 extern int sdb_begin_function_line;
 341 #endif
 342
 343 /* File in which assembler code is being written.  */
 344
 345 #ifdef BUFSIZ
 346 extern FILE *asm_out_file;
 347 #endif
 348
 349 /* The first global object in the file.  */
 350 extern const char *first_global_object_name;
 351
 352 /* The first weak object in the file.  */
 353 extern const char *weak_global_object_name;
 354
 355 /* Nonzero if function being compiled doesn't contain any calls
 356    (ignoring the prologue and epilogue).  This is set prior to
 357    local register allocation and is valid for the remaining
 358    compiler passes.  */
 359
 360 extern int current_function_is_leaf;
 361
 362 /* Nonzero if function being compiled doesn't modify the stack pointer
 363    (ignoring the prologue and epilogue).  This is only valid after
 364    pass_stack_ptr_mod has run.  */
 365
 366 extern int current_function_sp_is_unchanging;
 367
 368 /* Nonzero if the function being compiled is a leaf function which only
 369    uses leaf registers.  This is valid after reload (specifically after
 370    sched2) and is useful only if the port defines LEAF_REGISTERS.  */
 371
 372 extern int current_function_uses_only_leaf_regs;
 373
 374 /* Default file in which to dump debug output.  */
 375
 376 #ifdef BUFSIZ
 377 extern FILE *dump_file;
 378 #endif
 379
 380 /* Nonnull if the insn currently being emitted was a COND_EXEC pattern.  */
 381 extern rtx current_insn_predicate;
 382
 383 /* Last insn processed by final_scan_insn.  */
 384 extern rtx current_output_insn;
 385
 386 /* Nonzero while outputting an `asm' with operands.
 387    This means that inconsistencies are the user's fault, so don't die.
 388    The precise value is the insn being output, to pass to error_for_asm.  */
 389 extern rtx this_is_asm_operands;
 390
 391 /* Carry information from ASM_DECLARE_OBJECT_NAME
 392    to ASM_FINISH_DECLARE_OBJECT.  */
 393 extern int size_directive_output;
 394 extern tree last_assemble_variable_decl;
 395
 396 extern bool first_function_block_is_cold;
 397
 398 /* Decide whether DECL needs to be in a writable section.
 399    RELOC is the same as for SELECT_SECTION.  */
 400 extern bool decl_readonly_section (const_tree, int);
 401
 402 /* This can be used to compute RELOC for the function above, when
 403    given a constant expression.  */
 404 extern int compute_reloc_for_constant (tree);
 405
 406 /* User label prefix in effect for this compilation.  */
 407 extern const char *user_label_prefix;
 408
 409 /* Default target function prologue and epilogue assembler output.  */
 410 extern void default_function_pro_epilogue (FILE *, HOST_WIDE_INT);
 411
 412 /* Default target hook that outputs nothing to a stream.  */
 413 extern void no_asm_to_stream (FILE *);
 414
 415 /* Flags controlling properties of a section.  */
 416 #define SECTION_ENTSIZE  0x000ff        /* entity size in section */
 417 #define SECTION_CODE     0x00100        /* contains code */
 418 #define SECTION_WRITE    0x00200        /* data is writable */
 419 #define SECTION_DEBUG    0x00400        /* contains debug data */
 420 #define SECTION_LINKONCE 0x00800        /* is linkonce */
 421 #define SECTION_SMALL    0x01000        /* contains "small data" */
 422 #define SECTION_BSS      0x02000        /* contains zeros only */
 423 #define SECTION_FORGET   0x04000        /* forget that we've entered the section */
 424 #define SECTION_MERGE    0x08000        /* contains mergeable data */
 425 #define SECTION_STRINGS  0x10000        /* contains zero terminated strings without
 426                                            embedded zeros */
 427 #define SECTION_OVERRIDE 0x20000        /* allow override of default flags */
 428 #define SECTION_TLS      0x40000        /* contains thread-local storage */
 429 #define SECTION_NOTYPE   0x80000        /* don't output @progbits */
 430 #define SECTION_DECLARED 0x100000       /* section has been used */
 431 #define SECTION_STYLE_MASK 0x600000     /* bits used for SECTION_STYLE */
 432 #define SECTION_COMMON   0x800000       /* contains common data */
 433 #define SECTION_MACH_DEP 0x1000000      /* subsequent bits reserved for target */
 434
 435 /* This SECTION_STYLE is used for unnamed sections that we can switch
 436    to using a special assembler directive.  */
 437 #define SECTION_UNNAMED  0x000000
 438
 439 /* This SECTION_STYLE is used for named sections that we can switch
 440    to using a general section directive.  */
 441 #define SECTION_NAMED    0x200000
 442
 443 /* This SECTION_STYLE is used for sections that we cannot switch to at
 444    all.  The choice of section is implied by the directive that we use
 445    to declare the object.  */
 446 #define SECTION_NOSWITCH 0x400000
 447
 448 /* A helper function for default_elf_select_section and
 449    default_elf_unique_section.  Categorizes the DECL.  */
 450
 451 enum section_category
 452 {
 453   SECCAT_TEXT,
 454
 455   SECCAT_RODATA,
 456   SECCAT_RODATA_MERGE_STR,
 457   SECCAT_RODATA_MERGE_STR_INIT,
 458   SECCAT_RODATA_MERGE_CONST,
 459   SECCAT_SRODATA,
 460
 461   SECCAT_DATA,
 462
 463   /* To optimize loading of shared programs, define following subsections
 464      of data section:
 465         _REL    Contains data that has relocations, so they get grouped
 466                 together and dynamic linker will visit fewer pages in memory.
 467         _RO     Contains data that is otherwise read-only.  This is useful
 468                 with prelinking as most relocations won't be dynamically
 469                 linked and thus stay read only.
 470         _LOCAL  Marks data containing relocations only to local objects.
 471                 These relocations will get fully resolved by prelinking.  */
 472   SECCAT_DATA_REL,
 473   SECCAT_DATA_REL_LOCAL,
 474   SECCAT_DATA_REL_RO,
 475   SECCAT_DATA_REL_RO_LOCAL,
 476
 477   SECCAT_SDATA,
 478   SECCAT_TDATA,
 479
 480   SECCAT_BSS,
 481   SECCAT_SBSS,
 482   SECCAT_TBSS,
 483
 484   SECCAT_EMUTLS_VAR,
 485   SECCAT_EMUTLS_TMPL
 486 };
 487
 488 /* Information that is provided by all instances of the section type.  */
 489 struct GTY(()) section_common {
 490   /* The set of SECTION_* flags that apply to this section.  */
 491   unsigned int flags;
 492 };
 493
 494 /* Information about a SECTION_NAMED section.  */
 495 struct GTY(()) named_section {
 496   struct section_common common;
 497
 498   /* The name of the section.  */
 499   const char *name;
 500
 501   /* If nonnull, the VAR_DECL or FUNCTION_DECL with which the
 502      section is associated.  */
 503   tree decl;
 504 };
 505
 506 /* A callback that writes the assembly code for switching to an unnamed
 507    section.  The argument provides callback-specific data.  */
 508 typedef void (*unnamed_section_callback) (const void *);
 509
 510 /* Information about a SECTION_UNNAMED section.  */
 511 struct GTY(()) unnamed_section {
 512   struct section_common common;
 513
 514   /* The callback used to switch to the section, and the data that
 515      should be passed to the callback.  */
 516   unnamed_section_callback GTY ((skip)) callback;
 517   const void *GTY ((skip)) data;
 518
 519   /* The next entry in the chain of unnamed sections.  */
 520   section *next;
 521 };
 522
 523 /* A callback that writes the assembly code for a decl in a
 524    SECTION_NOSWITCH section.  DECL is the decl that should be assembled
 525    and NAME is the name of its SYMBOL_REF.  SIZE is the size of the decl
 526    in bytes and ROUNDED is that size rounded up to the next
 527    BIGGEST_ALIGNMENT / BITS_PER_UNIT boundary.
 528
 529    Return true if the callback used DECL_ALIGN to set the object's
 530    alignment.  A false return value implies that we are relying
 531    on the rounded size to align the decl.  */
 532 typedef bool (*noswitch_section_callback) (tree decl, const char *name,
 533                                            unsigned HOST_WIDE_INT size,
 534                                            unsigned HOST_WIDE_INT rounded);
 535
 536 /* Information about a SECTION_NOSWITCH section.  */
 537 struct GTY(()) noswitch_section {
 538   struct section_common common;
 539
 540   /* The callback used to assemble decls in this section.  */
 541   noswitch_section_callback GTY ((skip)) callback;
 542 };
 543
 544 /* Information about a section, which may be named or unnamed.  */
 545 union GTY ((desc ("SECTION_STYLE (&(%h))"))) section {
 546   struct section_common GTY ((skip)) common;
 547   struct named_section GTY ((tag ("SECTION_NAMED"))) named;
 548   struct unnamed_section GTY ((tag ("SECTION_UNNAMED"))) unnamed;
 549   struct noswitch_section GTY ((tag ("SECTION_NOSWITCH"))) noswitch;
 550 };
 551
 552 /* Return the style of section SECT.  */
 553 #define SECTION_STYLE(SECT) ((SECT)->common.flags & SECTION_STYLE_MASK)
 554
 555 struct object_block;
 556
 557 /* Special well-known sections.  */
 558 extern GTY(()) section *text_section;
 559 extern GTY(()) section *data_section;
 560 extern GTY(()) section *readonly_data_section;
 561 extern GTY(()) section *sdata_section;
 562 extern GTY(()) section *ctors_section;
 563 extern GTY(()) section *dtors_section;
 564 extern GTY(()) section *bss_section;
 565 extern GTY(()) section *sbss_section;
 566 extern GTY(()) section *exception_section;
 567 extern GTY(()) section *eh_frame_section;
 568 extern GTY(()) section *tls_comm_section;
 569 extern GTY(()) section *comm_section;
 570 extern GTY(()) section *lcomm_section;
 571 extern GTY(()) section *bss_noswitch_section;
 572
 573 extern GTY(()) section *in_section;
 574 extern GTY(()) bool in_cold_section_p;
 575
 576 extern section *get_unnamed_section (unsigned int, void (*) (const void *),
 577                                      const void *);
 578 extern section *get_section (const char *, unsigned int, tree);
 579 extern section *get_named_section (tree, const char *, int);
 580 extern void place_block_symbol (rtx);
 581 extern rtx get_section_anchor (struct object_block *, HOST_WIDE_INT,
 582                                enum tls_model);
 583 extern section *mergeable_constant_section (enum machine_mode,
 584                                             unsigned HOST_WIDE_INT,
 585                                             unsigned int);
 586 extern section *function_section (tree);
 587 extern section *unlikely_text_section (void);
 588 extern section *current_function_section (void);
 589
 590 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
 591    not) section for PRIORITY.  */
 592 extern section *get_cdtor_priority_section (int, bool);
 593
 594 extern bool unlikely_text_section_p (section *);
 595 extern void switch_to_section (section *);
 596 extern void output_section_asm_op (const void *);
 597
 598 extern unsigned int default_section_type_flags (tree, const char *, int);
 599
 600 extern bool have_global_bss_p (void);
 601 extern void default_no_named_section (const char *, unsigned int, tree);
 602 extern void default_elf_asm_named_section (const char *, unsigned int, tree);
 603 extern enum section_category categorize_decl_for_section (const_tree, int);
 604 extern void default_coff_asm_named_section (const char *, unsigned int, tree);
 605 extern void default_pe_asm_named_section (const char *, unsigned int, tree);
 606
 607 extern void default_stabs_asm_out_destructor (rtx, int);
 608 extern void default_named_section_asm_out_destructor (rtx, int);
 609 extern void default_dtor_section_asm_out_destructor (rtx, int);
 610 extern void default_stabs_asm_out_constructor (rtx, int);
 611 extern void default_named_section_asm_out_constructor (rtx, int);
 612 extern void default_ctor_section_asm_out_constructor (rtx, int);
 613
 614 extern section *default_select_section (tree, int, unsigned HOST_WIDE_INT);
 615 extern section *default_elf_select_section (tree, int, unsigned HOST_WIDE_INT);
 616 extern void default_unique_section (tree, int);
 617 extern section *default_function_rodata_section (tree);
 618 extern section *default_no_function_rodata_section (tree);
 619 extern section *default_select_rtx_section (enum machine_mode, rtx,
 620                                             unsigned HOST_WIDE_INT);
 621 extern section *default_elf_select_rtx_section (enum machine_mode, rtx,
 622                                                 unsigned HOST_WIDE_INT);
 623 extern void default_encode_section_info (tree, rtx, int);
 624 extern const char *default_strip_name_encoding (const char *);
 625 extern void default_asm_output_anchor (rtx);
 626 extern bool default_use_anchors_for_symbol_p (const_rtx);
 627 extern bool default_binds_local_p (const_tree);
 628 extern bool default_binds_local_p_1 (const_tree, int);
 629 extern void default_globalize_label (FILE *, const char *);
 630 extern void default_globalize_decl_name (FILE *, tree);
 631 extern void default_emit_unwind_label (FILE *, tree, int, int);
 632 extern void default_emit_except_table_label (FILE *);
 633 extern void default_internal_label (FILE *, const char *, unsigned long);
 634 extern void default_asm_declare_constant_name (FILE *, const char *,
 635                                                const_tree, HOST_WIDE_INT);
 636 extern void default_file_start (void);
 637 extern void file_end_indicate_exec_stack (void);
 638
 639 extern void default_elf_asm_output_external (FILE *file, tree,
 640                                              const char *);
 641 extern int maybe_assemble_visibility (tree);
 642
 643 extern int default_address_cost (rtx, bool);
 644
 645 /* dbxout helper functions */
 646 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
 647
 648 extern void dbxout_int (int);
 649 extern void dbxout_stabd (int, int);
 650 extern void dbxout_begin_stabn (int);
 651 extern void dbxout_begin_stabn_sline (int);
 652 extern void dbxout_begin_empty_stabs (int);
 653 extern void dbxout_begin_simple_stabs (const char *, int);
 654 extern void dbxout_begin_simple_stabs_desc (const char *, int, int);
 655
 656 extern void dbxout_stab_value_zero (void);
 657 extern void dbxout_stab_value_label (const char *);
 658 extern void dbxout_stab_value_label_diff (const char *, const char *);
 659 extern void dbxout_stab_value_internal_label (const char *, int *);
 660 extern void dbxout_stab_value_internal_label_diff (const char *, int *,
 661                                                    const char *);
 662
 663 #endif
 664
 665 #endif /* ! GCC_OUTPUT_H */