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
  27 #if !defined(IN_LIBGCC2) && !defined(IN_TARGET_LIBS) && !defined(IN_RTS)
  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 /* Run the second compilation of -fcompare-debug.  Not defined using
  82    Var in common.opt because this is used in Ada code and so must be
  83    an actual variable not a macro.  */
  84 extern int flag_compare_debug;
  85
  86 /* Enumerate visibility settings.  This is deliberately ordered from most
  87    to least visibility.  */
  88 #ifndef SYMBOL_VISIBILITY_DEFINED
  89 #define SYMBOL_VISIBILITY_DEFINED
  90 enum symbol_visibility
  91 {
  92   VISIBILITY_DEFAULT,
  93   VISIBILITY_PROTECTED,
  94   VISIBILITY_HIDDEN,
  95   VISIBILITY_INTERNAL
  96 };
  97 #endif
  98
  99 /* The default visibility for all symbols (unless overridden).  */
 100 extern enum symbol_visibility default_visibility;
 101
 102 struct visibility_flags
 103 {
 104   unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
 105   unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
 106 };
 107
 108 /* Global visibility options.  */
 109 extern struct visibility_flags visibility_options;
 110
 111 /* True if this is the LTO front end (lto1).  This is used to disable
 112    gimple generation and lowering passes that are normally run on the
 113    output of a front end.  These passes must be bypassed for lto since
 114    they have already been done before the gimple was written.  */
 115
 116 extern bool in_lto_p;
 117
 118 /* Nonzero if we should write GIMPLE bytecode for link-time optimization.  */
 119
 120 extern int flag_generate_lto;
 121
 122 /* Used to set the level of -Wstrict-aliasing, when no level is specified.
 123    The external way to set the default level is to use
 124    -Wstrict-aliasing=level.
 125    ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
 126    and 0 otherwise.  After calling this function, wstrict_aliasing will be
 127    set to the default value of -Wstrict_aliasing=level.  */
 128
 129 extern void set_Wstrict_aliasing (int onoff);
 130
 131 /* Nonzero means warn about any objects definitions whose size is larger
 132    than N bytes.  Also want about function definitions whose returned
 133    values are larger than N bytes. The value N is in `larger_than_size'.  */
 134
 135 extern bool warn_larger_than;
 136 extern HOST_WIDE_INT larger_than_size;
 137
 138 /* Nonzero means warn about any function whose frame size is larger
 139    than N bytes. */
 140
 141 extern bool warn_frame_larger_than;
 142 extern HOST_WIDE_INT frame_larger_than_size;
 143
 144 /* Nonzero for -dp: annotate the assembly with a comment describing the
 145    pattern and alternative used.  */
 146
 147 extern int flag_print_asm_name;
 148 \f
 149 /* Now the symbols that are set with `-f' switches.  */
 150
 151 /* Nonzero if we are only using compiler to check syntax errors.  */
 152
 153 extern int rtl_dump_and_exit;
 154
 155 /* Nonzero means we should save auxiliary info into a .X file.  */
 156
 157 extern int flag_gen_aux_info;
 158
 159 /* True if printing into -fdump-final-insns= dump.  */
 160
 161 extern bool final_insns_dump_p;
 162
 163 /* Nonzero means change certain warnings into errors.
 164    Usually these are warnings about failure to conform to some standard.  */
 165
 166 extern int flag_pedantic_errors;
 167
 168 /* Nonzero means make permerror produce warnings instead of errors.  */
 169
 170 extern int flag_permissive;
 171
 172 /* Nonzero if we are compiling code for a shared library, zero for
 173    executable.  */
 174
 175 extern int flag_shlib;
 176
 177 /* -dA causes debug information to be produced in
 178    the generated assembly code (to make it more readable).  This option
 179    is generally only of use to those who actually need to read the
 180    generated assembly code (perhaps while debugging the compiler itself).
 181    Currently, this switch is only used by dwarfout.c; however, it is intended
 182    to be a catchall for printing debug information in the assembler file.  */
 183
 184 extern int flag_debug_asm;
 185
 186 /* Generate code for GNU or NeXT Objective-C runtime environment.  */
 187
 188 extern int flag_next_runtime;
 189
 190 extern int flag_dump_rtl_in_asm;
 191
 192 /* The algorithm used for the integrated register allocator (IRA).  */
 193 enum ira_algorithm
 194 {
 195   IRA_ALGORITHM_CB,
 196   IRA_ALGORITHM_PRIORITY
 197 };
 198
 199 /* The regions used for the integrated register allocator (IRA).  */
 200 enum ira_region
 201 {
 202   IRA_REGION_ONE,
 203   IRA_REGION_ALL,
 204   IRA_REGION_MIXED
 205 };
 206
 207 /* The options for excess precision.  */
 208 enum excess_precision
 209 {
 210   EXCESS_PRECISION_DEFAULT,
 211   EXCESS_PRECISION_FAST,
 212   EXCESS_PRECISION_STANDARD
 213 };
 214
 215 /* The excess precision specified on the command line, or defaulted by
 216    the front end.  */
 217 extern enum excess_precision flag_excess_precision_cmdline;
 218 \f
 219 /* Other basic status info about current function.  */
 220
 221 /* Target-dependent global state.  */
 222 struct target_flag_state {
 223   /* Values of the -falign-* flags: how much to align labels in code.
 224      0 means `use default', 1 means `don't align'.
 225      For each variable, there is an _log variant which is the power
 226      of two not less than the variable, for .align output.  */
 227   int x_align_loops_log;
 228   int x_align_loops_max_skip;
 229   int x_align_jumps_log;
 230   int x_align_jumps_max_skip;
 231   int x_align_labels_log;
 232   int x_align_labels_max_skip;
 233   int x_align_functions_log;
 234
 235   /* The excess precision currently in effect.  */
 236   enum excess_precision x_flag_excess_precision;
 237 };
 238
 239 extern struct target_flag_state default_target_flag_state;
 240 #if SWITCHABLE_TARGET
 241 extern struct target_flag_state *this_target_flag_state;
 242 #else
 243 #define this_target_flag_state (&default_target_flag_state)
 244 #endif
 245
 246 #define align_loops_log \
 247   (this_target_flag_state->x_align_loops_log)
 248 #define align_loops_max_skip \
 249   (this_target_flag_state->x_align_loops_max_skip)
 250 #define align_jumps_log \
 251   (this_target_flag_state->x_align_jumps_log)
 252 #define align_jumps_max_skip \
 253   (this_target_flag_state->x_align_jumps_max_skip)
 254 #define align_labels_log \
 255   (this_target_flag_state->x_align_labels_log)
 256 #define align_labels_max_skip \
 257   (this_target_flag_state->x_align_labels_max_skip)
 258 #define align_functions_log \
 259   (this_target_flag_state->x_align_functions_log)
 260 #define flag_excess_precision \
 261   (this_target_flag_state->x_flag_excess_precision)
 262
 263 /* Nonzero if we dump in VCG format, not plain text.  */
 264 extern int dump_for_graph;
 265
 266 /* Selection of the graph form.  */
 267 enum graph_dump_types
 268 {
 269   no_graph = 0,
 270   vcg
 271 };
 272 extern enum graph_dump_types graph_dump_format;
 273
 274 /* Type of stack check.  */
 275 enum stack_check_type
 276 {
 277   /* Do not check the stack.  */
 278   NO_STACK_CHECK = 0,
 279
 280   /* Check the stack generically, i.e. assume no specific support
 281      from the target configuration files.  */
 282   GENERIC_STACK_CHECK,
 283
 284   /* Check the stack and rely on the target configuration files to
 285      check the static frame of functions, i.e. use the generic
 286      mechanism only for dynamic stack allocations.  */
 287   STATIC_BUILTIN_STACK_CHECK,
 288
 289   /* Check the stack and entirely rely on the target configuration
 290      files, i.e. do not use the generic mechanism at all.  */
 291   FULL_BUILTIN_STACK_CHECK
 292 };
 293 extern enum stack_check_type flag_stack_check;
 294
 295 /* Returns TRUE if generated code should match ABI version N or
 296    greater is in use.  */
 297
 298 #define abi_version_at_least(N) \
 299   (flag_abi_version == 0 || flag_abi_version >= (N))
 300
 301 /* Return whether the function should be excluded from
 302    instrumentation.  */
 303 extern bool flag_instrument_functions_exclude_p (tree fndecl);
 304
 305 /* True if overflow wraps around for the given integral type.  That
 306    is, TYPE_MAX + 1 == TYPE_MIN.  */
 307 #define TYPE_OVERFLOW_WRAPS(TYPE) \
 308   (TYPE_UNSIGNED (TYPE) || flag_wrapv)
 309
 310 /* True if overflow is undefined for the given integral type.  We may
 311    optimize on the assumption that values in the type never overflow.
 312
 313    IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
 314    must issue a warning based on warn_strict_overflow.  In some cases
 315    it will be appropriate to issue the warning immediately, and in
 316    other cases it will be appropriate to simply set a flag and let the
 317    caller decide whether a warning is appropriate or not.  */
 318 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
 319   (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
 320
 321 /* True if overflow for the given integral type should issue a
 322    trap.  */
 323 #define TYPE_OVERFLOW_TRAPS(TYPE) \
 324   (!TYPE_UNSIGNED (TYPE) && flag_trapv)
 325
 326 /* True if pointer types have undefined overflow.  */
 327 #define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
 328
 329 /* Names for the different levels of -Wstrict-overflow=N.  The numeric
 330    values here correspond to N.  */
 331
 332 enum warn_strict_overflow_code
 333 {
 334   /* Overflow warning that should be issued with -Wall: a questionable
 335      construct that is easy to avoid even when using macros.  Example:
 336      folding (x + CONSTANT > x) to 1.  */
 337   WARN_STRICT_OVERFLOW_ALL = 1,
 338   /* Overflow warning about folding a comparison to a constant because
 339      of undefined signed overflow, other than cases covered by
 340      WARN_STRICT_OVERFLOW_ALL.  Example: folding (abs (x) >= 0) to 1
 341      (this is false when x == INT_MIN).  */
 342   WARN_STRICT_OVERFLOW_CONDITIONAL = 2,
 343   /* Overflow warning about changes to comparisons other than folding
 344      them to a constant.  Example: folding (x + 1 > 1) to (x > 0).  */
 345   WARN_STRICT_OVERFLOW_COMPARISON = 3,
 346   /* Overflow warnings not covered by the above cases.  Example:
 347      folding ((x * 10) / 5) to (x * 2).  */
 348   WARN_STRICT_OVERFLOW_MISC = 4,
 349   /* Overflow warnings about reducing magnitude of constants in
 350      comparison.  Example: folding (x + 2 > y) to (x + 1 >= y).  */
 351   WARN_STRICT_OVERFLOW_MAGNITUDE = 5
 352 };
 353
 354 /* Whether to emit an overflow warning whose code is C.  */
 355 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
 356
 357 #endif
 358
 359 /* This is included last because options may use types declared
 360    above.  */
 361 #include "options.h"
 362
 363 #endif /* ! GCC_FLAGS_H */