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, 2011
   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 /* Similar to decode_reg_name, but takes an extra parameter that is a
 181    pointer to the number of (internal) registers described by the
 182    external name.  */
 183 extern int decode_reg_name_and_count (const char *, int *);
 184
 185 extern void assemble_alias (tree, tree);
 186
 187 extern void default_assemble_visibility (tree, int);
 188
 189 /* Output a string of literal assembler code
 190    for an `asm' keyword used between functions.  */
 191 extern void assemble_asm (tree);
 192
 193 /* Output assembler code for the constant pool of a function and associated
 194    with defining the name of the function.  DECL describes the function.
 195    NAME is the function's name.  For the constant pool, we use the current
 196    constant pool data.  */
 197 extern void assemble_start_function (tree, const char *);
 198
 199 /* Output assembler code associated with defining the size of the
 200    function.  DECL describes the function.  NAME is the function's name.  */
 201 extern void assemble_end_function (tree, const char *);
 202
 203 /* Assemble everything that is needed for a variable or function declaration.
 204    Not used for automatic variables, and not used for function definitions.
 205    Should not be called for variables of incomplete structure type.
 206
 207    TOP_LEVEL is nonzero if this variable has file scope.
 208    AT_END is nonzero if this is the special handling, at end of compilation,
 209    to define things that have had only tentative definitions.
 210    DONT_OUTPUT_DATA if nonzero means don't actually output the
 211    initial value (that will be done by the caller).  */
 212 extern void assemble_variable (tree, int, int, int);
 213
 214 /* Compute the alignment of variable specified by DECL.
 215    DONT_OUTPUT_DATA is from assemble_variable.  */
 216 extern void align_variable (tree decl, bool dont_output_data);
 217
 218 /* Queue for outputting something to declare an external symbol to the
 219    assembler.  (Most assemblers don't need this, so we normally output
 220    nothing.)  Do nothing if DECL is not external.  */
 221 extern void assemble_external (tree);
 222
 223 /* Assemble code to leave SIZE bytes of zeros.  */
 224 extern void assemble_zeros (unsigned HOST_WIDE_INT);
 225
 226 /* Assemble an alignment pseudo op for an ALIGN-bit boundary.  */
 227 extern void assemble_align (int);
 228
 229 /* Assemble a string constant with the specified C string as contents.  */
 230 extern void assemble_string (const char *, int);
 231
 232 /* Similar, for calling a library function FUN.  */
 233 extern void assemble_external_libcall (rtx);
 234
 235 /* Assemble a label named NAME.  */
 236 extern void assemble_label (FILE *, const char *);
 237
 238 /* Output to FILE (an assembly file) a reference to NAME.  If NAME
 239    starts with a *, the rest of NAME is output verbatim.  Otherwise
 240    NAME is transformed in a target-specific way (usually by the
 241    addition of an underscore).  */
 242 extern void assemble_name_raw (FILE *, const char *);
 243
 244 /* Like assemble_name_raw, but should be used when NAME might refer to
 245    an entity that is also represented as a tree (like a function or
 246    variable).  If NAME does refer to such an entity, that entity will
 247    be marked as referenced.  */
 248 extern void assemble_name (FILE *, const char *);
 249
 250 /* Return the assembler directive for creating a given kind of integer
 251    object.  SIZE is the number of bytes in the object and ALIGNED_P
 252    indicates whether it is known to be aligned.  Return NULL if the
 253    assembly dialect has no such directive.
 254
 255    The returned string should be printed at the start of a new line and
 256    be followed immediately by the object's initial value.  */
 257 extern const char *integer_asm_op (int, int);
 258
 259 /* Use directive OP to assemble an integer object X.  Print OP at the
 260    start of the line, followed immediately by the value of X.  */
 261 extern void assemble_integer_with_op (const char *, rtx);
 262
 263 /* The default implementation of the asm_out.integer target hook.  */
 264 extern bool default_assemble_integer (rtx, unsigned int, int);
 265
 266 /* Assemble the integer constant X into an object of SIZE bytes.  ALIGN is
 267    the alignment of the integer in bits.  Return 1 if we were able to output
 268    the constant, otherwise 0.  If FORCE is nonzero the constant must
 269    be outputable. */
 270 extern bool assemble_integer (rtx, unsigned, unsigned, int);
 271
 272 /* Return section for TEXT_SECITON_NAME if DECL or DECL_SECTION_NAME (DECL)
 273    is NULL.  */
 274 extern section *get_named_text_section (tree, const char *, const char *);
 275
 276 /* An interface to assemble_integer for the common case in which a value is
 277    fully aligned and must be printed.  VALUE is the value of the integer
 278    object and SIZE is the number of bytes it contains.  */
 279 #define assemble_aligned_integer(SIZE, VALUE) \
 280   assemble_integer (VALUE, SIZE, (SIZE) * BITS_PER_UNIT, 1)
 281
 282 #ifdef REAL_VALUE_TYPE_SIZE
 283 /* Assemble the floating-point constant D into an object of size MODE.  */
 284 extern void assemble_real (REAL_VALUE_TYPE, enum machine_mode, unsigned);
 285 #endif
 286
 287 /* Write the address of the entity given by SYMBOL to SEC.  */
 288 extern void assemble_addr_to_section (rtx, section *);
 289
 290 /* Return the size of the constant pool.  */
 291 extern int get_pool_size (void);
 292
 293 #ifdef HAVE_peephole
 294 extern rtx peephole (rtx);
 295 #endif
 296
 297 extern void output_shared_constant_pool (void);
 298
 299 extern void output_object_blocks (void);
 300
 301 extern void output_quoted_string (FILE *, const char *);
 302
 303 /* Whether a constructor CTOR is a valid static constant initializer if all
 304    its elements are.  This used to be internal to initializer_constant_valid_p
 305    and has been exposed to let other functions like categorize_ctor_elements
 306    evaluate the property while walking a constructor for other purposes.  */
 307
 308 extern bool constructor_static_from_elts_p (const_tree);
 309
 310 /* Return nonzero if VALUE is a valid constant-valued expression
 311    for use in initializing a static variable; one that can be an
 312    element of a "constant" initializer.
 313
 314    Return null_pointer_node if the value is absolute;
 315    if it is relocatable, return the variable that determines the relocation.
 316    We assume that VALUE has been folded as much as possible;
 317    therefore, we do not need to check for such things as
 318    arithmetic-combinations of integers.  */
 319 extern tree initializer_constant_valid_p (tree, tree);
 320
 321 /* Return true if VALUE is a valid constant-valued expression
 322    for use in initializing a static bit-field; one that can be
 323    an element of a "constant" initializer.  */
 324 extern bool initializer_constant_valid_for_bitfield_p (tree);
 325
 326 /* Output assembler code for constant EXP to FILE, with no label.
 327    This includes the pseudo-op such as ".int" or ".byte", and a newline.
 328    Assumes output_addressed_constants has been done on EXP already.
 329
 330    Generate exactly SIZE bytes of assembler data, padding at the end
 331    with zeros if necessary.  SIZE must always be specified.
 332
 333    ALIGN is the alignment in bits that may be assumed for the data.  */
 334 extern void output_constant (tree, unsigned HOST_WIDE_INT, unsigned int);
 335
 336 /* When outputting delayed branch sequences, this rtx holds the
 337    sequence being output.  It is null when no delayed branch
 338    sequence is being output, so it can be used as a test in the
 339    insn output code.
 340
 341    This variable is defined  in final.c.  */
 342 extern rtx final_sequence;
 343
 344 /* The line number of the beginning of the current function.  Various
 345    md code needs this so that it can output relative linenumbers.  */
 346
 347 #ifdef SDB_DEBUGGING_INFO /* Avoid undef sym in certain broken linkers.  */
 348 extern int sdb_begin_function_line;
 349 #endif
 350
 351 /* File in which assembler code is being written.  */
 352
 353 #ifdef BUFSIZ
 354 extern FILE *asm_out_file;
 355 #endif
 356
 357 /* The first global object in the file.  */
 358 extern const char *first_global_object_name;
 359
 360 /* The first weak object in the file.  */
 361 extern const char *weak_global_object_name;
 362
 363 /* Nonzero if function being compiled doesn't contain any calls
 364    (ignoring the prologue and epilogue).  This is set prior to
 365    local register allocation and is valid for the remaining
 366    compiler passes.  */
 367
 368 extern int current_function_is_leaf;
 369
 370 /* Nonzero if function being compiled doesn't modify the stack pointer
 371    (ignoring the prologue and epilogue).  This is only valid after
 372    pass_stack_ptr_mod has run.  */
 373
 374 extern int current_function_sp_is_unchanging;
 375
 376 /* Nonzero if the function being compiled is a leaf function which only
 377    uses leaf registers.  This is valid after reload (specifically after
 378    sched2) and is useful only if the port defines LEAF_REGISTERS.  */
 379
 380 extern int current_function_uses_only_leaf_regs;
 381
 382 /* Default file in which to dump debug output.  */
 383
 384 #ifdef BUFSIZ
 385 extern FILE *dump_file;
 386 #endif
 387
 388 /* Nonnull if the insn currently being emitted was a COND_EXEC pattern.  */
 389 extern rtx current_insn_predicate;
 390
 391 /* Last insn processed by final_scan_insn.  */
 392 extern rtx current_output_insn;
 393
 394 /* Nonzero while outputting an `asm' with operands.
 395    This means that inconsistencies are the user's fault, so don't die.
 396    The precise value is the insn being output, to pass to error_for_asm.  */
 397 extern rtx this_is_asm_operands;
 398
 399 /* Carry information from ASM_DECLARE_OBJECT_NAME
 400    to ASM_FINISH_DECLARE_OBJECT.  */
 401 extern int size_directive_output;
 402 extern tree last_assemble_variable_decl;
 403
 404 extern bool first_function_block_is_cold;
 405
 406 /* Decide whether DECL needs to be in a writable section.
 407    RELOC is the same as for SELECT_SECTION.  */
 408 extern bool decl_readonly_section (const_tree, int);
 409
 410 /* This can be used to compute RELOC for the function above, when
 411    given a constant expression.  */
 412 extern int compute_reloc_for_constant (tree);
 413
 414 /* User label prefix in effect for this compilation.  */
 415 extern const char *user_label_prefix;
 416
 417 /* Default target function prologue and epilogue assembler output.  */
 418 extern void default_function_pro_epilogue (FILE *, HOST_WIDE_INT);
 419
 420 /* Default target function switched text sections.  */
 421 extern void default_function_switched_text_sections (FILE *, tree, bool);
 422
 423 /* Default target hook that outputs nothing to a stream.  */
 424 extern void no_asm_to_stream (FILE *);
 425
 426 /* Flags controlling properties of a section.  */
 427 #define SECTION_ENTSIZE  0x000ff        /* entity size in section */
 428 #define SECTION_CODE     0x00100        /* contains code */
 429 #define SECTION_WRITE    0x00200        /* data is writable */
 430 #define SECTION_DEBUG    0x00400        /* contains debug data */
 431 #define SECTION_LINKONCE 0x00800        /* is linkonce */
 432 #define SECTION_SMALL    0x01000        /* contains "small data" */
 433 #define SECTION_BSS      0x02000        /* contains zeros only */
 434 #define SECTION_FORGET   0x04000        /* forget that we've entered the section */
 435 #define SECTION_MERGE    0x08000        /* contains mergeable data */
 436 #define SECTION_STRINGS  0x10000        /* contains zero terminated strings without
 437                                            embedded zeros */
 438 #define SECTION_OVERRIDE 0x20000        /* allow override of default flags */
 439 #define SECTION_TLS      0x40000        /* contains thread-local storage */
 440 #define SECTION_NOTYPE   0x80000        /* don't output @progbits */
 441 #define SECTION_DECLARED 0x100000       /* section has been used */
 442 #define SECTION_STYLE_MASK 0x600000     /* bits used for SECTION_STYLE */
 443 #define SECTION_COMMON   0x800000       /* contains common data */
 444 #define SECTION_RELRO    0x1000000      /* data is readonly after relocation processing */
 445 #define SECTION_MACH_DEP 0x2000000      /* subsequent bits reserved for target */
 446
 447 /* This SECTION_STYLE is used for unnamed sections that we can switch
 448    to using a special assembler directive.  */
 449 #define SECTION_UNNAMED  0x000000
 450
 451 /* This SECTION_STYLE is used for named sections that we can switch
 452    to using a general section directive.  */
 453 #define SECTION_NAMED    0x200000
 454
 455 /* This SECTION_STYLE is used for sections that we cannot switch to at
 456    all.  The choice of section is implied by the directive that we use
 457    to declare the object.  */
 458 #define SECTION_NOSWITCH 0x400000
 459
 460 /* A helper function for default_elf_select_section and
 461    default_elf_unique_section.  Categorizes the DECL.  */
 462
 463 enum section_category
 464 {
 465   SECCAT_TEXT,
 466
 467   SECCAT_RODATA,
 468   SECCAT_RODATA_MERGE_STR,
 469   SECCAT_RODATA_MERGE_STR_INIT,
 470   SECCAT_RODATA_MERGE_CONST,
 471   SECCAT_SRODATA,
 472
 473   SECCAT_DATA,
 474
 475   /* To optimize loading of shared programs, define following subsections
 476      of data section:
 477         _REL    Contains data that has relocations, so they get grouped
 478                 together and dynamic linker will visit fewer pages in memory.
 479         _RO     Contains data that is otherwise read-only.  This is useful
 480                 with prelinking as most relocations won't be dynamically
 481                 linked and thus stay read only.
 482         _LOCAL  Marks data containing relocations only to local objects.
 483                 These relocations will get fully resolved by prelinking.  */
 484   SECCAT_DATA_REL,
 485   SECCAT_DATA_REL_LOCAL,
 486   SECCAT_DATA_REL_RO,
 487   SECCAT_DATA_REL_RO_LOCAL,
 488
 489   SECCAT_SDATA,
 490   SECCAT_TDATA,
 491
 492   SECCAT_BSS,
 493   SECCAT_SBSS,
 494   SECCAT_TBSS
 495 };
 496
 497 /* Information that is provided by all instances of the section type.  */
 498 struct GTY(()) section_common {
 499   /* The set of SECTION_* flags that apply to this section.  */
 500   unsigned int flags;
 501 };
 502
 503 /* Information about a SECTION_NAMED section.  */
 504 struct GTY(()) named_section {
 505   struct section_common common;
 506
 507   /* The name of the section.  */
 508   const char *name;
 509
 510   /* If nonnull, the VAR_DECL or FUNCTION_DECL with which the
 511      section is associated.  */
 512   tree decl;
 513 };
 514
 515 /* A callback that writes the assembly code for switching to an unnamed
 516    section.  The argument provides callback-specific data.  */
 517 typedef void (*unnamed_section_callback) (const void *);
 518
 519 /* Information about a SECTION_UNNAMED section.  */
 520 struct GTY(()) unnamed_section {
 521   struct section_common common;
 522
 523   /* The callback used to switch to the section, and the data that
 524      should be passed to the callback.  */
 525   unnamed_section_callback GTY ((skip)) callback;
 526   const void *GTY ((skip)) data;
 527
 528   /* The next entry in the chain of unnamed sections.  */
 529   section *next;
 530 };
 531
 532 /* A callback that writes the assembly code for a decl in a
 533    SECTION_NOSWITCH section.  DECL is the decl that should be assembled
 534    and NAME is the name of its SYMBOL_REF.  SIZE is the size of the decl
 535    in bytes and ROUNDED is that size rounded up to the next
 536    BIGGEST_ALIGNMENT / BITS_PER_UNIT boundary.
 537
 538    Return true if the callback used DECL_ALIGN to set the object's
 539    alignment.  A false return value implies that we are relying
 540    on the rounded size to align the decl.  */
 541 typedef bool (*noswitch_section_callback) (tree decl, const char *name,
 542                                            unsigned HOST_WIDE_INT size,
 543                                            unsigned HOST_WIDE_INT rounded);
 544
 545 /* Information about a SECTION_NOSWITCH section.  */
 546 struct GTY(()) noswitch_section {
 547   struct section_common common;
 548
 549   /* The callback used to assemble decls in this section.  */
 550   noswitch_section_callback GTY ((skip)) callback;
 551 };
 552
 553 /* Information about a section, which may be named or unnamed.  */
 554 union GTY ((desc ("SECTION_STYLE (&(%h))"))) section {
 555   struct section_common GTY ((skip)) common;
 556   struct named_section GTY ((tag ("SECTION_NAMED"))) named;
 557   struct unnamed_section GTY ((tag ("SECTION_UNNAMED"))) unnamed;
 558   struct noswitch_section GTY ((tag ("SECTION_NOSWITCH"))) noswitch;
 559 };
 560
 561 /* Return the style of section SECT.  */
 562 #define SECTION_STYLE(SECT) ((SECT)->common.flags & SECTION_STYLE_MASK)
 563
 564 struct object_block;
 565
 566 /* Special well-known sections.  */
 567 extern GTY(()) section *text_section;
 568 extern GTY(()) section *data_section;
 569 extern GTY(()) section *readonly_data_section;
 570 extern GTY(()) section *sdata_section;
 571 extern GTY(()) section *ctors_section;
 572 extern GTY(()) section *dtors_section;
 573 extern GTY(()) section *bss_section;
 574 extern GTY(()) section *sbss_section;
 575 extern GTY(()) section *exception_section;
 576 extern GTY(()) section *eh_frame_section;
 577 extern GTY(()) section *tls_comm_section;
 578 extern GTY(()) section *comm_section;
 579 extern GTY(()) section *lcomm_section;
 580 extern GTY(()) section *bss_noswitch_section;
 581
 582 extern GTY(()) section *in_section;
 583 extern GTY(()) bool in_cold_section_p;
 584
 585 extern section *get_unnamed_section (unsigned int, void (*) (const void *),
 586                                      const void *);
 587 extern section *get_section (const char *, unsigned int, tree);
 588 extern section *get_named_section (tree, const char *, int);
 589 extern section *get_variable_section (tree, bool);
 590 extern void place_block_symbol (rtx);
 591 extern rtx get_section_anchor (struct object_block *, HOST_WIDE_INT,
 592                                enum tls_model);
 593 extern section *mergeable_constant_section (enum machine_mode,
 594                                             unsigned HOST_WIDE_INT,
 595                                             unsigned int);
 596 extern section *function_section (tree);
 597 extern section *unlikely_text_section (void);
 598 extern section *current_function_section (void);
 599
 600 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
 601    not) section for PRIORITY.  */
 602 extern section *get_cdtor_priority_section (int, bool);
 603
 604 extern bool unlikely_text_section_p (section *);
 605 extern void switch_to_section (section *);
 606 extern void output_section_asm_op (const void *);
 607
 608 extern void default_asm_output_source_filename (FILE *, const char *);
 609 extern void output_file_directive (FILE *, const char *);
 610
 611 extern unsigned int default_section_type_flags (tree, const char *, int);
 612
 613 extern bool have_global_bss_p (void);
 614 extern void default_no_named_section (const char *, unsigned int, tree);
 615 extern void default_elf_asm_named_section (const char *, unsigned int, tree);
 616 extern enum section_category categorize_decl_for_section (const_tree, int);
 617 extern void default_coff_asm_named_section (const char *, unsigned int, tree);
 618 extern void default_pe_asm_named_section (const char *, unsigned int, tree);
 619
 620 extern void default_stabs_asm_out_destructor (rtx, int);
 621 extern void default_named_section_asm_out_destructor (rtx, int);
 622 extern void default_dtor_section_asm_out_destructor (rtx, int);
 623 extern void default_stabs_asm_out_constructor (rtx, int);
 624 extern void default_named_section_asm_out_constructor (rtx, int);
 625 extern void default_ctor_section_asm_out_constructor (rtx, int);
 626
 627 extern section *default_select_section (tree, int, unsigned HOST_WIDE_INT);
 628 extern section *default_elf_select_section (tree, int, unsigned HOST_WIDE_INT);
 629 extern void default_unique_section (tree, int);
 630 extern section *default_function_rodata_section (tree);
 631 extern section *default_no_function_rodata_section (tree);
 632 extern section *default_select_rtx_section (enum machine_mode, rtx,
 633                                             unsigned HOST_WIDE_INT);
 634 extern section *default_elf_select_rtx_section (enum machine_mode, rtx,
 635                                                 unsigned HOST_WIDE_INT);
 636 extern void default_encode_section_info (tree, rtx, int);
 637 extern const char *default_strip_name_encoding (const char *);
 638 extern void default_asm_output_anchor (rtx);
 639 extern bool default_use_anchors_for_symbol_p (const_rtx);
 640 extern bool default_binds_local_p (const_tree);
 641 extern bool default_binds_local_p_1 (const_tree, int);
 642 extern void default_globalize_label (FILE *, const char *);
 643 extern void default_globalize_decl_name (FILE *, tree);
 644 extern void default_emit_unwind_label (FILE *, tree, int, int);
 645 extern void default_emit_except_table_label (FILE *);
 646 extern void default_generate_internal_label (char *, const char *,
 647                                              unsigned long);
 648 extern void default_internal_label (FILE *, const char *, unsigned long);
 649 extern void default_asm_declare_constant_name (FILE *, const char *,
 650                                                const_tree, HOST_WIDE_INT);
 651 extern void default_file_start (void);
 652 extern void file_end_indicate_exec_stack (void);
 653 extern void file_end_indicate_split_stack (void);
 654
 655 extern void default_elf_asm_output_external (FILE *file, tree,
 656                                              const char *);
 657 extern int maybe_assemble_visibility (tree);
 658
 659 extern int default_address_cost (rtx, bool);
 660
 661 /* Output stack usage information.  */
 662 extern void output_stack_usage (void);
 663
 664 /* dbxout helper functions */
 665 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
 666
 667 extern void dbxout_int (int);
 668 extern void dbxout_stabd (int, int);
 669 extern void dbxout_begin_stabn (int);
 670 extern void dbxout_begin_stabn_sline (int);
 671 extern void dbxout_begin_empty_stabs (int);
 672 extern void dbxout_begin_simple_stabs (const char *, int);
 673 extern void dbxout_begin_simple_stabs_desc (const char *, int, int);
 674
 675 extern void dbxout_stab_value_zero (void);
 676 extern void dbxout_stab_value_label (const char *);
 677 extern void dbxout_stab_value_label_diff (const char *, const char *);
 678 extern void dbxout_stab_value_internal_label (const char *, int *);
 679 extern void dbxout_stab_value_internal_label_diff (const char *, int *,
 680                                                    const char *);
 681
 682 #endif
 683
 684 #endif /* ! GCC_OUTPUT_H */