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
   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 2, 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 COPYING.  If not, write to the Free
  20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  21 02111-1307, USA.  */
  22
  23 #ifndef GCC_FLAGS_H
  24 #define GCC_FLAGS_H
  25
  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 /* Nonzero means use GNU-only extensions in the generated symbolic
  58    debugging information.  */
  59 extern bool use_gnu_debug_info_extensions;
  60
  61 /* Enumerate visibility settings.  */
  62 #ifndef SYMBOL_VISIBILITY_DEFINED
  63 #define SYMBOL_VISIBILITY_DEFINED
  64 enum symbol_visibility
  65 {
  66   VISIBILITY_DEFAULT,
  67   VISIBILITY_INTERNAL,
  68   VISIBILITY_HIDDEN,
  69   VISIBILITY_PROTECTED
  70 };
  71 #endif
  72
  73 /* The default visibility for all symbols (unless overridden).  */
  74 extern enum symbol_visibility default_visibility;
  75
  76 struct visibility_flags
  77 {
  78   unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
  79   unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
  80 };
  81
  82 /* Global visibility options.  */
  83 extern struct visibility_flags visibility_options;
  84
  85 /* Nonzero means do optimizations.  -opt.  */
  86
  87 extern int optimize;
  88
  89 /* Nonzero means optimize for size.  -Os.  */
  90
  91 extern int optimize_size;
  92
  93 /* Do print extra warnings (such as for uninitialized variables).
  94    -W/-Wextra.  */
  95
  96 extern bool extra_warnings;
  97
  98 /* Nonzero to warn about unused variables, functions et.al.  Use
  99    set_Wunused() to update the -Wunused-* flags that correspond to the
 100    -Wunused option.  */
 101
 102 extern void set_Wunused (int setting);
 103
 104 /* Nonzero means warn about function definitions that default the return type
 105    or that use a null return and have a return-type other than void.  */
 106
 107 extern int warn_return_type;
 108
 109 /* Nonzero means warn about any objects definitions whose size is larger
 110    than N bytes.  Also want about function definitions whose returned
 111    values are larger than N bytes. The value N is in `larger_than_size'.  */
 112
 113 extern bool warn_larger_than;
 114 extern HOST_WIDE_INT larger_than_size;
 115
 116 /* Nonzero means warn about constructs which might not be strict
 117    aliasing safe.  */
 118
 119 extern int warn_strict_aliasing;
 120
 121 /* Temporarily suppress certain warnings.
 122    This is set while reading code from a system header file.  */
 123
 124 extern int in_system_header;
 125
 126 /* Nonzero for -dp: annotate the assembly with a comment describing the
 127    pattern and alternative used.  */
 128
 129 extern int flag_print_asm_name;
 130 \f
 131 /* Now the symbols that are set with `-f' switches.  */
 132
 133 /* Nonzero means `char' should be signed.  */
 134
 135 extern int flag_signed_char;
 136
 137 /* Nonzero means give an enum type only as many bytes as it needs.  A value
 138    of 2 means it has not yet been initialized.  */
 139
 140 extern int flag_short_enums;
 141
 142 /* Nonzero for -fpcc-struct-return: return values the same way PCC does.  */
 143
 144 extern int flag_pcc_struct_return;
 145
 146 /* 0 means straightforward implementation of complex divide acceptable.
 147    1 means wide ranges of inputs must work for complex divide.
 148    2 means C99-like requirements for complex divide (not yet implemented).  */
 149
 150 extern int flag_complex_divide_method;
 151
 152 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
 153    not just because the tree inliner turned us off.  */
 154
 155 extern int flag_really_no_inline;
 156
 157 /* Nonzero if we are only using compiler to check syntax errors.  */
 158
 159 extern int rtl_dump_and_exit;
 160
 161 /* Nonzero means we should save auxiliary info into a .X file.  */
 162
 163 extern int flag_gen_aux_info;
 164
 165 /* Nonzero means suppress output of instruction numbers and line number
 166    notes in debugging dumps.  */
 167
 168 extern int flag_dump_unnumbered;
 169
 170 /* Nonzero means change certain warnings into errors.
 171    Usually these are warnings about failure to conform to some standard.  */
 172
 173 extern int flag_pedantic_errors;
 174
 175 /* Nonzero if we are compiling code for a shared library, zero for
 176    executable.  */
 177
 178 extern int flag_shlib;
 179
 180 /* -dA causes debug information to be produced in
 181    the generated assembly code (to make it more readable).  This option
 182    is generally only of use to those who actually need to read the
 183    generated assembly code (perhaps while debugging the compiler itself).
 184    Currently, this switch is only used by dwarfout.c; however, it is intended
 185    to be a catchall for printing debug information in the assembler file.  */
 186
 187 extern int flag_debug_asm;
 188
 189 extern int flag_dump_rtl_in_asm;
 190
 191 /* If one, renumber instruction UIDs to reduce the number of
 192    unused UIDs if there are a lot of instructions.  If greater than
 193    one, unconditionally renumber instruction UIDs.  */
 194 extern int flag_renumber_insns;
 195 \f
 196 /* Other basic status info about current function.  */
 197
 198 /* Nonzero means current function must be given a frame pointer.
 199    Set in stmt.c if anything is allocated on the stack there.
 200    Set in reload1.c if anything is allocated on the stack there.  */
 201
 202 extern int frame_pointer_needed;
 203
 204 /* Nonzero if subexpressions must be evaluated from left-to-right.  */
 205 extern int flag_evaluation_order;
 206
 207 /* Value of the -G xx switch, and whether it was passed or not.  */
 208 extern unsigned HOST_WIDE_INT g_switch_value;
 209 extern bool g_switch_set;
 210
 211 /* Values of the -falign-* flags: how much to align labels in code.
 212    0 means `use default', 1 means `don't align'.
 213    For each variable, there is an _log variant which is the power
 214    of two not less than the variable, for .align output.  */
 215
 216 extern int align_loops_log;
 217 extern int align_loops_max_skip;
 218 extern int align_jumps_log;
 219 extern int align_jumps_max_skip;
 220 extern int align_labels_log;
 221 extern int align_labels_max_skip;
 222 extern int align_functions_log;
 223
 224 /* Like align_functions_log above, but used by front-ends to force the
 225    minimum function alignment.  Zero means no alignment is forced.  */
 226 extern int force_align_functions_log;
 227
 228 /* Nonzero if we dump in VCG format, not plain text.  */
 229 extern int dump_for_graph;
 230
 231 /* Selection of the graph form.  */
 232 enum graph_dump_types
 233 {
 234   no_graph = 0,
 235   vcg
 236 };
 237 extern enum graph_dump_types graph_dump_format;
 238
 239 /* Nonzero means to collect statistics which might be expensive
 240    and to print them when we are done.  */
 241 extern int flag_detailed_statistics;
 242
 243 /* Enable points-to analysis on trees.  */
 244 enum pta_type
 245   {
 246     PTA_NONE,
 247     PTA_ANDERSEN
 248   };
 249 extern enum pta_type flag_tree_points_to;
 250
 251 extern int flag_web;
 252
 253 /* Nonzero means that we defer emitting functions until they are actually
 254    used.  */
 255 extern int flag_remove_unreachable_functions;
 256
 257 /* Nonzero if we should track variables.  */
 258 extern int flag_var_tracking;
 259
 260 /* True if flag_speculative_prefetching was set by user.  Used to suppress
 261    warning message in case flag was set by -fprofile-{generate,use}.  */
 262 extern bool flag_speculative_prefetching_set;
 263
 264 /* A string that's used when a random name is required.  NULL means
 265    to make it really random.  */
 266
 267 extern const char *flag_random_seed;
 268
 269 /* Returns TRUE if generated code should match ABI version N or
 270    greater is in use.  */
 271
 272 #define abi_version_at_least(N) \
 273   (flag_abi_version == 0 || flag_abi_version >= (N))
 274
 275 /* True if the given mode has a NaN representation and the treatment of
 276    NaN operands is important.  Certain optimizations, such as folding
 277    x * 0 into x, are not correct for NaN operands, and are normally
 278    disabled for modes with NaNs.  The user can ask for them to be
 279    done anyway using the -funsafe-math-optimizations switch.  */
 280 #define HONOR_NANS(MODE) \
 281   (MODE_HAS_NANS (MODE) && !flag_finite_math_only)
 282
 283 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs).  */
 284 #define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
 285
 286 /* As for HONOR_NANS, but true if the mode can represent infinity and
 287    the treatment of infinite values is important.  */
 288 #define HONOR_INFINITIES(MODE) \
 289   (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)
 290
 291 /* Like HONOR_NANS, but true if the given mode distinguishes between
 292    positive and negative zero, and the sign of zero is important.  */
 293 #define HONOR_SIGNED_ZEROS(MODE) \
 294   (MODE_HAS_SIGNED_ZEROS (MODE) && !flag_unsafe_math_optimizations)
 295
 296 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
 297    and the rounding mode is important.  */
 298 #define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
 299   (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
 300
 301 #endif /* ! GCC_FLAGS_H */