contrib/gcc-4.4/gcc/flags.h

   1 /* Compilation switch flag definitions for GCC.
   2    Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002,
   3    2003, 2004, 2005, 2006, 2007, 2008, 2009
   4    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_FLAGS_H
  23 #define GCC_FLAGS_H
  24
  25 #include "coretypes.h"
  26 #include "options.h"
  27 #include "real.h"
  28
  29 enum debug_info_type
  30 {
  31   NO_DEBUG,         /* Write no debug info.  */
  32   DBX_DEBUG,        /* Write BSD .stabs for DBX (using dbxout.c).  */
  33   SDB_DEBUG,        /* Write COFF for (old) SDB (using sdbout.c).  */
  34   DWARF2_DEBUG,     /* Write Dwarf v2 debug info (using dwarf2out.c).  */
  35   XCOFF_DEBUG,      /* Write IBM/Xcoff debug info (using dbxout.c).  */
  36   VMS_DEBUG,        /* Write VMS debug info (using vmsdbgout.c).  */
  37   VMS_AND_DWARF2_DEBUG /* Write VMS debug info (using vmsdbgout.c).
  38                           and DWARF v2 debug info (using dwarf2out.c).  */
  39 };
  40
  41 /* Specify which kind of debugging info to generate.  */
  42 extern enum debug_info_type write_symbols;
  43
  44 /* Names of debug_info_type, for error messages.  */
  45 extern const char *const debug_type_names[];
  46
  47 enum debug_info_level
  48 {
  49   DINFO_LEVEL_NONE,     /* Write no debugging info.  */
  50   DINFO_LEVEL_TERSE,    /* Write minimal info to support tracebacks only.  */
  51   DINFO_LEVEL_NORMAL,   /* Write info for all declarations (and line table).  */
  52   DINFO_LEVEL_VERBOSE   /* Write normal info plus #define/#undef info.  */
  53 };
  54
  55 /* Specify how much debugging info to generate.  */
  56 extern enum debug_info_level debug_info_level;
  57
  58 /* A major contribution to object and executable size is debug
  59    information size.  A major contribution to debug information
  60    size is struct descriptions replicated in several object files.
  61    The following function determines whether or not debug information
  62    should be generated for a given struct.  The indirect parameter
  63    indicates that the struct is being handled indirectly, via
  64    a pointer.  See opts.c for the implementation. */
  65
  66 enum debug_info_usage
  67 {
  68   DINFO_USAGE_DFN,      /* A struct definition. */
  69   DINFO_USAGE_DIR_USE,  /* A direct use, such as the type of a variable. */
  70   DINFO_USAGE_IND_USE,  /* An indirect use, such as through a pointer. */
  71   DINFO_USAGE_NUM_ENUMS /* The number of enumerators. */
  72 };
  73
  74 extern bool should_emit_struct_debug (tree type_decl, enum debug_info_usage);
  75 extern void set_struct_debug_option (const char *value);
  76
  77 /* Nonzero means use GNU-only extensions in the generated symbolic
  78    debugging information.  */
  79 extern bool use_gnu_debug_info_extensions;
  80
  81 /* Enumerate visibility settings.  This is deliberately ordered from most
  82    to least visibility.  */
  83 #ifndef SYMBOL_VISIBILITY_DEFINED
  84 #define SYMBOL_VISIBILITY_DEFINED
  85 enum symbol_visibility
  86 {
  87   VISIBILITY_DEFAULT,
  88   VISIBILITY_PROTECTED,
  89   VISIBILITY_HIDDEN,
  90   VISIBILITY_INTERNAL
  91 };
  92 #endif
  93
  94 /* The default visibility for all symbols (unless overridden).  */
  95 extern enum symbol_visibility default_visibility;
  96
  97 struct visibility_flags
  98 {
  99   unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
 100   unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
 101 };
 102
 103 /* Global visibility options.  */
 104 extern struct visibility_flags visibility_options;
 105
 106 /* Nonzero means do optimizations.  -opt.  */
 107
 108 extern int optimize;
 109
 110 /* Nonzero means optimize for size.  -Os.  */
 111
 112 extern int optimize_size;
 113
 114 /* Do print extra warnings (such as for uninitialized variables).
 115    -W/-Wextra.  */
 116
 117 extern bool extra_warnings;
 118
 119 /* Used to set the level of -Wstrict-aliasing, when no level is specified.
 120    The external way to set the default level is to use
 121    -Wstrict-aliasing=level.
 122    ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
 123    and 0 otherwise.  After calling this function, wstrict_aliasing will be
 124    set to the default value of -Wstrict_aliasing=level.  */
 125
 126 extern void set_Wstrict_aliasing (int onoff);
 127
 128 /* Nonzero means warn about any objects definitions whose size is larger
 129    than N bytes.  Also want about function definitions whose returned
 130    values are larger than N bytes. The value N is in `larger_than_size'.  */
 131
 132 extern bool warn_larger_than;
 133 extern HOST_WIDE_INT larger_than_size;
 134
 135 /* Nonzero means warn about any function whose frame size is larger
 136    than N bytes. */
 137
 138 extern bool warn_frame_larger_than;
 139 extern HOST_WIDE_INT frame_larger_than_size;
 140
 141 /* Nonzero for -dp: annotate the assembly with a comment describing the
 142    pattern and alternative used.  */
 143
 144 extern int flag_print_asm_name;
 145 \f
 146 /* Now the symbols that are set with `-f' switches.  */
 147
 148 /* Nonzero means `char' should be signed.  */
 149
 150 extern int flag_signed_char;
 151
 152 /* Nonzero means give an enum type only as many bytes as it needs.  A value
 153    of 2 means it has not yet been initialized.  */
 154
 155 extern int flag_short_enums;
 156
 157 /* Nonzero for -fpcc-struct-return: return values the same way PCC does.  */
 158
 159 extern int flag_pcc_struct_return;
 160
 161 /* 0 means straightforward implementation of complex divide acceptable.
 162    1 means wide ranges of inputs must work for complex divide.
 163    2 means C99-like requirements for complex multiply and divide.  */
 164
 165 extern int flag_complex_method;
 166
 167 /* Nonzero if we are only using compiler to check syntax errors.  */
 168
 169 extern int rtl_dump_and_exit;
 170
 171 /* Nonzero means we should save auxiliary info into a .X file.  */
 172
 173 extern int flag_gen_aux_info;
 174
 175 /* Nonzero means suppress output of instruction numbers and line number
 176    notes in debugging dumps.  */
 177
 178 extern int flag_dump_unnumbered;
 179
 180 /* Nonzero means change certain warnings into errors.
 181    Usually these are warnings about failure to conform to some standard.  */
 182
 183 extern int flag_pedantic_errors;
 184
 185 /* Nonzero means make permerror produce warnings instead of errors.  */
 186
 187 extern int flag_permissive;
 188
 189 /* Nonzero if we are compiling code for a shared library, zero for
 190    executable.  */
 191
 192 extern int flag_shlib;
 193
 194 /* -dA causes debug information to be produced in
 195    the generated assembly code (to make it more readable).  This option
 196    is generally only of use to those who actually need to read the
 197    generated assembly code (perhaps while debugging the compiler itself).
 198    Currently, this switch is only used by dwarfout.c; however, it is intended
 199    to be a catchall for printing debug information in the assembler file.  */
 200
 201 extern int flag_debug_asm;
 202
 203 /* Generate code for GNU or NeXT Objective-C runtime environment.  */
 204
 205 extern int flag_next_runtime;
 206
 207 extern int flag_dump_rtl_in_asm;
 208
 209 /* The algorithm used for the integrated register allocator (IRA).  */
 210 enum ira_algorithm
 211 {
 212   IRA_ALGORITHM_CB,
 213   IRA_ALGORITHM_PRIORITY
 214 };
 215
 216 extern enum ira_algorithm flag_ira_algorithm;
 217
 218 /* The regions used for the integrated register allocator (IRA).  */
 219 enum ira_region
 220 {
 221   IRA_REGION_ONE,
 222   IRA_REGION_ALL,
 223   IRA_REGION_MIXED
 224 };
 225
 226 extern enum ira_region flag_ira_region;
 227
 228 extern unsigned int flag_ira_verbose;
 229
 230 \f
 231 /* Other basic status info about current function.  */
 232
 233 /* Nonzero if subexpressions must be evaluated from left-to-right.  */
 234 extern int flag_evaluation_order;
 235
 236 /* Value of the -G xx switch, and whether it was passed or not.  */
 237 extern unsigned HOST_WIDE_INT g_switch_value;
 238 extern bool g_switch_set;
 239
 240 /* Same for selective scheduling.  */
 241 extern bool sel_sched_switch_set;
 242
 243 /* Values of the -falign-* flags: how much to align labels in code.
 244    0 means `use default', 1 means `don't align'.
 245    For each variable, there is an _log variant which is the power
 246    of two not less than the variable, for .align output.  */
 247
 248 extern int align_loops_log;
 249 extern int align_loops_max_skip;
 250 extern int align_jumps_log;
 251 extern int align_jumps_max_skip;
 252 extern int align_labels_log;
 253 extern int align_labels_max_skip;
 254 extern int align_functions_log;
 255
 256 /* Nonzero if we dump in VCG format, not plain text.  */
 257 extern int dump_for_graph;
 258
 259 /* Selection of the graph form.  */
 260 enum graph_dump_types
 261 {
 262   no_graph = 0,
 263   vcg
 264 };
 265 extern enum graph_dump_types graph_dump_format;
 266
 267 /* Nonzero means to collect statistics which might be expensive
 268    and to print them when we are done.  */
 269 extern int flag_detailed_statistics;
 270
 271 /* Nonzero means that we defer emitting functions until they are actually
 272    used.  */
 273 extern int flag_remove_unreachable_functions;
 274
 275 /* Nonzero if we should track variables.  */
 276 extern int flag_var_tracking;
 277
 278 /* True if flag_speculative_prefetching was set by user.  Used to suppress
 279    warning message in case flag was set by -fprofile-{generate,use}.  */
 280 extern bool flag_speculative_prefetching_set;
 281
 282 /* Type of stack check.  */
 283 enum stack_check_type
 284 {
 285   /* Do not check the stack.  */
 286   NO_STACK_CHECK = 0,
 287
 288   /* Check the stack generically, i.e. assume no specific support
 289      from the target configuration files.  */
 290   GENERIC_STACK_CHECK,
 291
 292   /* Check the stack and rely on the target configuration files to
 293      check the static frame of functions, i.e. use the generic
 294      mechanism only for dynamic stack allocations.  */
 295   STATIC_BUILTIN_STACK_CHECK,
 296
 297   /* Check the stack and entirely rely on the target configuration
 298      files, i.e. do not use the generic mechanism at all.  */
 299   FULL_BUILTIN_STACK_CHECK
 300 };
 301 extern enum stack_check_type flag_stack_check;
 302
 303 /* Returns TRUE if generated code should match ABI version N or
 304    greater is in use.  */
 305
 306 #define abi_version_at_least(N) \
 307   (flag_abi_version == 0 || flag_abi_version >= (N))
 308
 309 /* Return whether the function should be excluded from
 310    instrumentation.  */
 311 extern bool flag_instrument_functions_exclude_p (tree fndecl);
 312
 313 /* True if the given mode has a NaN representation and the treatment of
 314    NaN operands is important.  Certain optimizations, such as folding
 315    x * 0 into 0, are not correct for NaN operands, and are normally
 316    disabled for modes with NaNs.  The user can ask for them to be
 317    done anyway using the -funsafe-math-optimizations switch.  */
 318 #define HONOR_NANS(MODE) \
 319   (MODE_HAS_NANS (MODE) && !flag_finite_math_only)
 320
 321 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs).  */
 322 #define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
 323
 324 /* As for HONOR_NANS, but true if the mode can represent infinity and
 325    the treatment of infinite values is important.  */
 326 #define HONOR_INFINITIES(MODE) \
 327   (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)
 328
 329 /* Like HONOR_NANS, but true if the given mode distinguishes between
 330    positive and negative zero, and the sign of zero is important.  */
 331 #define HONOR_SIGNED_ZEROS(MODE) \
 332   (MODE_HAS_SIGNED_ZEROS (MODE) && flag_signed_zeros)
 333
 334 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
 335    and the rounding mode is important.  */
 336 #define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
 337   (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
 338
 339 /* True if overflow wraps around for the given integral type.  That
 340    is, TYPE_MAX + 1 == TYPE_MIN.  */
 341 #define TYPE_OVERFLOW_WRAPS(TYPE) \
 342   (TYPE_UNSIGNED (TYPE) || flag_wrapv)
 343
 344 /* True if overflow is undefined for the given integral type.  We may
 345    optimize on the assumption that values in the type never overflow.
 346
 347    IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
 348    must issue a warning based on warn_strict_overflow.  In some cases
 349    it will be appropriate to issue the warning immediately, and in
 350    other cases it will be appropriate to simply set a flag and let the
 351    caller decide whether a warning is appropriate or not.  */
 352 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
 353   (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
 354
 355 /* True if overflow for the given integral type should issue a
 356    trap.  */
 357 #define TYPE_OVERFLOW_TRAPS(TYPE) \
 358   (!TYPE_UNSIGNED (TYPE) && flag_trapv)
 359
 360 /* True if pointer types have undefined overflow.  */
 361 #define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
 362
 363 /* Names for the different levels of -Wstrict-overflow=N.  The numeric
 364    values here correspond to N.  */
 365
 366 enum warn_strict_overflow_code
 367 {
 368   /* Overflow warning that should be issued with -Wall: a questionable
 369      construct that is easy to avoid even when using macros.  Example:
 370      folding (x + CONSTANT > x) to 1.  */
 371   WARN_STRICT_OVERFLOW_ALL = 1,
 372   /* Overflow warning about folding a comparison to a constant because
 373      of undefined signed overflow, other than cases covered by
 374      WARN_STRICT_OVERFLOW_ALL.  Example: folding (abs (x) >= 0) to 1
 375      (this is false when x == INT_MIN).  */
 376   WARN_STRICT_OVERFLOW_CONDITIONAL = 2,
 377   /* Overflow warning about changes to comparisons other than folding
 378      them to a constant.  Example: folding (x + 1 > 1) to (x > 0).  */
 379   WARN_STRICT_OVERFLOW_COMPARISON = 3,
 380   /* Overflow warnings not covered by the above cases.  Example:
 381      folding ((x * 10) / 5) to (x * 2).  */
 382   WARN_STRICT_OVERFLOW_MISC = 4,
 383   /* Overflow warnings about reducing magnitude of constants in
 384      comparison.  Example: folding (x + 2 > y) to (x + 1 >= y).  */
 385   WARN_STRICT_OVERFLOW_MAGNITUDE = 5
 386 };
 387
 388 /* Whether to emit an overflow warning whose code is C.  */
 389 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
 390
 391 #endif /* ! GCC_FLAGS_H */