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, 2010
   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
  28 enum debug_info_type
  29 {
  30   NO_DEBUG,         /* Write no debug info.  */
  31   DBX_DEBUG,        /* Write BSD .stabs for DBX (using dbxout.c).  */
  32   SDB_DEBUG,        /* Write COFF for (old) SDB (using sdbout.c).  */
  33   DWARF2_DEBUG,     /* Write Dwarf v2 debug info (using dwarf2out.c).  */
  34   XCOFF_DEBUG,      /* Write IBM/Xcoff debug info (using dbxout.c).  */
  35   VMS_DEBUG,        /* Write VMS debug info (using vmsdbgout.c).  */
  36   VMS_AND_DWARF2_DEBUG /* Write VMS debug info (using vmsdbgout.c).
  37                           and DWARF v2 debug info (using dwarf2out.c).  */
  38 };
  39
  40 /* Specify which kind of debugging info to generate.  */
  41 extern enum debug_info_type write_symbols;
  42
  43 /* Names of debug_info_type, for error messages.  */
  44 extern const char *const debug_type_names[];
  45
  46 enum debug_info_level
  47 {
  48   DINFO_LEVEL_NONE,     /* Write no debugging info.  */
  49   DINFO_LEVEL_TERSE,    /* Write minimal info to support tracebacks only.  */
  50   DINFO_LEVEL_NORMAL,   /* Write info for all declarations (and line table).  */
  51   DINFO_LEVEL_VERBOSE   /* Write normal info plus #define/#undef info.  */
  52 };
  53
  54 /* Specify how much debugging info to generate.  */
  55 extern enum debug_info_level debug_info_level;
  56
  57 /* A major contribution to object and executable size is debug
  58    information size.  A major contribution to debug information
  59    size is struct descriptions replicated in several object files.
  60    The following function determines whether or not debug information
  61    should be generated for a given struct.  The indirect parameter
  62    indicates that the struct is being handled indirectly, via
  63    a pointer.  See opts.c for the implementation. */
  64
  65 enum debug_info_usage
  66 {
  67   DINFO_USAGE_DFN,      /* A struct definition. */
  68   DINFO_USAGE_DIR_USE,  /* A direct use, such as the type of a variable. */
  69   DINFO_USAGE_IND_USE,  /* An indirect use, such as through a pointer. */
  70   DINFO_USAGE_NUM_ENUMS /* The number of enumerators. */
  71 };
  72
  73 extern bool should_emit_struct_debug (tree type_decl, enum debug_info_usage);
  74 extern void set_struct_debug_option (const char *value);
  75
  76 /* Nonzero means use GNU-only extensions in the generated symbolic
  77    debugging information.  */
  78 extern bool use_gnu_debug_info_extensions;
  79
  80 /* Enumerate visibility settings.  This is deliberately ordered from most
  81    to least visibility.  */
  82 #ifndef SYMBOL_VISIBILITY_DEFINED
  83 #define SYMBOL_VISIBILITY_DEFINED
  84 enum symbol_visibility
  85 {
  86   VISIBILITY_DEFAULT,
  87   VISIBILITY_PROTECTED,
  88   VISIBILITY_HIDDEN,
  89   VISIBILITY_INTERNAL
  90 };
  91 #endif
  92
  93 /* The default visibility for all symbols (unless overridden).  */
  94 extern enum symbol_visibility default_visibility;
  95
  96 struct visibility_flags
  97 {
  98   unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
  99   unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
 100 };
 101
 102 /* Global visibility options.  */
 103 extern struct visibility_flags visibility_options;
 104
 105 /* Nonzero means do optimizations.  -opt.  */
 106
 107 extern int optimize;
 108
 109 /* Nonzero means optimize for size.  -Os.  */
 110
 111 extern int optimize_size;
 112
 113 /* True if this is the LTO front end (lto1).  This is used to disable
 114    gimple generation and lowering passes that are normally run on the
 115    output of a front end.  These passes must be bypassed for lto since
 116    they have already been done before the gimple was written.  */
 117
 118 extern bool in_lto_p;
 119
 120 /* Nonzero if we should write GIMPLE bytecode for link-time optimization.  */
 121
 122 extern int flag_generate_lto;
 123
 124 /* Used to set the level of -Wstrict-aliasing, when no level is specified.
 125    The external way to set the default level is to use
 126    -Wstrict-aliasing=level.
 127    ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
 128    and 0 otherwise.  After calling this function, wstrict_aliasing will be
 129    set to the default value of -Wstrict_aliasing=level.  */
 130
 131 extern void set_Wstrict_aliasing (int onoff);
 132
 133 /* Nonzero means warn about any objects definitions whose size is larger
 134    than N bytes.  Also want about function definitions whose returned
 135    values are larger than N bytes. The value N is in `larger_than_size'.  */
 136
 137 extern bool warn_larger_than;
 138 extern HOST_WIDE_INT larger_than_size;
 139
 140 /* Nonzero means warn about any function whose frame size is larger
 141    than N bytes. */
 142
 143 extern bool warn_frame_larger_than;
 144 extern HOST_WIDE_INT frame_larger_than_size;
 145
 146 /* Nonzero for -dp: annotate the assembly with a comment describing the
 147    pattern and alternative used.  */
 148
 149 extern int flag_print_asm_name;
 150 \f
 151 /* Now the symbols that are set with `-f' switches.  */
 152
 153 /* 0 means straightforward implementation of complex divide acceptable.
 154    1 means wide ranges of inputs must work for complex divide.
 155    2 means C99-like requirements for complex multiply and divide.  */
 156
 157 extern int flag_complex_method;
 158
 159 /* Nonzero if we are only using compiler to check syntax errors.  */
 160
 161 extern int rtl_dump_and_exit;
 162
 163 /* Nonzero means we should save auxiliary info into a .X file.  */
 164
 165 extern int flag_gen_aux_info;
 166
 167 /* Nonzero means suppress output of instruction numbers and line number
 168    notes in debugging dumps.  */
 169
 170 extern int flag_dump_unnumbered;
 171
 172 /* True if printing into -fdump-final-insns= dump.  */
 173
 174 extern bool final_insns_dump_p;
 175
 176 /* Nonzero means change certain warnings into errors.
 177    Usually these are warnings about failure to conform to some standard.  */
 178
 179 extern int flag_pedantic_errors;
 180
 181 /* Nonzero means make permerror produce warnings instead of errors.  */
 182
 183 extern int flag_permissive;
 184
 185 /* Nonzero if we are compiling code for a shared library, zero for
 186    executable.  */
 187
 188 extern int flag_shlib;
 189
 190 /* -dA causes debug information to be produced in
 191    the generated assembly code (to make it more readable).  This option
 192    is generally only of use to those who actually need to read the
 193    generated assembly code (perhaps while debugging the compiler itself).
 194    Currently, this switch is only used by dwarfout.c; however, it is intended
 195    to be a catchall for printing debug information in the assembler file.  */
 196
 197 extern int flag_debug_asm;
 198
 199 /* Generate code for GNU or NeXT Objective-C runtime environment.  */
 200
 201 extern int flag_next_runtime;
 202
 203 extern int flag_dump_rtl_in_asm;
 204
 205 /* The algorithm used for the integrated register allocator (IRA).  */
 206 enum ira_algorithm
 207 {
 208   IRA_ALGORITHM_CB,
 209   IRA_ALGORITHM_PRIORITY
 210 };
 211
 212 extern enum ira_algorithm flag_ira_algorithm;
 213
 214 /* The regions used for the integrated register allocator (IRA).  */
 215 enum ira_region
 216 {
 217   IRA_REGION_ONE,
 218   IRA_REGION_ALL,
 219   IRA_REGION_MIXED
 220 };
 221
 222 extern enum ira_region flag_ira_region;
 223
 224 /* The options for excess precision.  */
 225 enum excess_precision
 226 {
 227   EXCESS_PRECISION_DEFAULT,
 228   EXCESS_PRECISION_FAST,
 229   EXCESS_PRECISION_STANDARD
 230 };
 231
 232 /* The excess precision specified on the command line, or defaulted by
 233    the front end.  */
 234 extern enum excess_precision flag_excess_precision_cmdline;
 235 \f
 236 /* Other basic status info about current function.  */
 237
 238 /* Target-dependent global state.  */
 239 struct target_flag_state {
 240   /* Values of the -falign-* flags: how much to align labels in code.
 241      0 means `use default', 1 means `don't align'.
 242      For each variable, there is an _log variant which is the power
 243      of two not less than the variable, for .align output.  */
 244   int x_align_loops_log;
 245   int x_align_loops_max_skip;
 246   int x_align_jumps_log;
 247   int x_align_jumps_max_skip;
 248   int x_align_labels_log;
 249   int x_align_labels_max_skip;
 250   int x_align_functions_log;
 251
 252   /* The excess precision currently in effect.  */
 253   enum excess_precision x_flag_excess_precision;
 254 };
 255
 256 extern struct target_flag_state default_target_flag_state;
 257 #if SWITCHABLE_TARGET
 258 extern struct target_flag_state *this_target_flag_state;
 259 #else
 260 #define this_target_flag_state (&default_target_flag_state)
 261 #endif
 262
 263 #define align_loops_log \
 264   (this_target_flag_state->x_align_loops_log)
 265 #define align_loops_max_skip \
 266   (this_target_flag_state->x_align_loops_max_skip)
 267 #define align_jumps_log \
 268   (this_target_flag_state->x_align_jumps_log)
 269 #define align_jumps_max_skip \
 270   (this_target_flag_state->x_align_jumps_max_skip)
 271 #define align_labels_log \
 272   (this_target_flag_state->x_align_labels_log)
 273 #define align_labels_max_skip \
 274   (this_target_flag_state->x_align_labels_max_skip)
 275 #define align_functions_log \
 276   (this_target_flag_state->x_align_functions_log)
 277 #define flag_excess_precision \
 278   (this_target_flag_state->x_flag_excess_precision)
 279
 280 /* Nonzero if subexpressions must be evaluated from left-to-right.  */
 281 extern int flag_evaluation_order;
 282
 283 /* Value of the -G xx switch, and whether it was passed or not.  */
 284 extern unsigned HOST_WIDE_INT g_switch_value;
 285 extern bool g_switch_set;
 286
 287 /* Same for selective scheduling.  */
 288 extern bool sel_sched_switch_set;
 289
 290 /* Whether to run the warn_unused_result attribute pass.  */
 291 extern bool flag_warn_unused_result;
 292
 293 /* Nonzero if we dump in VCG format, not plain text.  */
 294 extern int dump_for_graph;
 295
 296 /* Selection of the graph form.  */
 297 enum graph_dump_types
 298 {
 299   no_graph = 0,
 300   vcg
 301 };
 302 extern enum graph_dump_types graph_dump_format;
 303
 304 /* Nonzero if we should track variables.  */
 305 extern int flag_var_tracking;
 306
 307 /* True if flag_speculative_prefetching was set by user.  Used to suppress
 308    warning message in case flag was set by -fprofile-{generate,use}.  */
 309 extern bool flag_speculative_prefetching_set;
 310
 311 /* Type of stack check.  */
 312 enum stack_check_type
 313 {
 314   /* Do not check the stack.  */
 315   NO_STACK_CHECK = 0,
 316
 317   /* Check the stack generically, i.e. assume no specific support
 318      from the target configuration files.  */
 319   GENERIC_STACK_CHECK,
 320
 321   /* Check the stack and rely on the target configuration files to
 322      check the static frame of functions, i.e. use the generic
 323      mechanism only for dynamic stack allocations.  */
 324   STATIC_BUILTIN_STACK_CHECK,
 325
 326   /* Check the stack and entirely rely on the target configuration
 327      files, i.e. do not use the generic mechanism at all.  */
 328   FULL_BUILTIN_STACK_CHECK
 329 };
 330 extern enum stack_check_type flag_stack_check;
 331
 332 /* Returns TRUE if generated code should match ABI version N or
 333    greater is in use.  */
 334
 335 #define abi_version_at_least(N) \
 336   (flag_abi_version == 0 || flag_abi_version >= (N))
 337
 338 /* Return whether the function should be excluded from
 339    instrumentation.  */
 340 extern bool flag_instrument_functions_exclude_p (tree fndecl);
 341
 342 /* True if overflow wraps around for the given integral type.  That
 343    is, TYPE_MAX + 1 == TYPE_MIN.  */
 344 #define TYPE_OVERFLOW_WRAPS(TYPE) \
 345   (TYPE_UNSIGNED (TYPE) || flag_wrapv)
 346
 347 /* True if overflow is undefined for the given integral type.  We may
 348    optimize on the assumption that values in the type never overflow.
 349
 350    IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
 351    must issue a warning based on warn_strict_overflow.  In some cases
 352    it will be appropriate to issue the warning immediately, and in
 353    other cases it will be appropriate to simply set a flag and let the
 354    caller decide whether a warning is appropriate or not.  */
 355 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
 356   (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
 357
 358 /* True if overflow for the given integral type should issue a
 359    trap.  */
 360 #define TYPE_OVERFLOW_TRAPS(TYPE) \
 361   (!TYPE_UNSIGNED (TYPE) && flag_trapv)
 362
 363 /* True if pointer types have undefined overflow.  */
 364 #define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
 365
 366 /* Names for the different levels of -Wstrict-overflow=N.  The numeric
 367    values here correspond to N.  */
 368
 369 enum warn_strict_overflow_code
 370 {
 371   /* Overflow warning that should be issued with -Wall: a questionable
 372      construct that is easy to avoid even when using macros.  Example:
 373      folding (x + CONSTANT > x) to 1.  */
 374   WARN_STRICT_OVERFLOW_ALL = 1,
 375   /* Overflow warning about folding a comparison to a constant because
 376      of undefined signed overflow, other than cases covered by
 377      WARN_STRICT_OVERFLOW_ALL.  Example: folding (abs (x) >= 0) to 1
 378      (this is false when x == INT_MIN).  */
 379   WARN_STRICT_OVERFLOW_CONDITIONAL = 2,
 380   /* Overflow warning about changes to comparisons other than folding
 381      them to a constant.  Example: folding (x + 1 > 1) to (x > 0).  */
 382   WARN_STRICT_OVERFLOW_COMPARISON = 3,
 383   /* Overflow warnings not covered by the above cases.  Example:
 384      folding ((x * 10) / 5) to (x * 2).  */
 385   WARN_STRICT_OVERFLOW_MISC = 4,
 386   /* Overflow warnings about reducing magnitude of constants in
 387      comparison.  Example: folding (x + 2 > y) to (x + 1 >= y).  */
 388   WARN_STRICT_OVERFLOW_MAGNITUDE = 5
 389 };
 390
 391 /* Whether to emit an overflow warning whose code is C.  */
 392 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
 393
 394 #endif /* ! GCC_FLAGS_H */