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
   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, 51 Franklin Street, Fifth Floor, Boston, MA
  21 02110-1301, 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 any objects definitions whose size is larger
 105    than N bytes.  Also want about function definitions whose returned
 106    values are larger than N bytes. The value N is in `larger_than_size'.  */
 107
 108 extern bool warn_larger_than;
 109 extern HOST_WIDE_INT larger_than_size;
 110
 111 /* Nonzero means warn about constructs which might not be strict
 112    aliasing safe.  */
 113
 114 extern int warn_strict_aliasing;
 115
 116 /* Temporarily suppress certain warnings.
 117    This is set while reading code from a system header file.  */
 118
 119 extern int in_system_header;
 120
 121 /* Nonzero for -dp: annotate the assembly with a comment describing the
 122    pattern and alternative used.  */
 123
 124 extern int flag_print_asm_name;
 125 \f
 126 /* Now the symbols that are set with `-f' switches.  */
 127
 128 /* Nonzero means `char' should be signed.  */
 129
 130 extern int flag_signed_char;
 131
 132 /* Nonzero means give an enum type only as many bytes as it needs.  A value
 133    of 2 means it has not yet been initialized.  */
 134
 135 extern int flag_short_enums;
 136
 137 /* Nonzero for -fpcc-struct-return: return values the same way PCC does.  */
 138
 139 extern int flag_pcc_struct_return;
 140
 141 /* 0 means straightforward implementation of complex divide acceptable.
 142    1 means wide ranges of inputs must work for complex divide.
 143    2 means C99-like requirements for complex multiply and divide.  */
 144
 145 extern int flag_complex_method;
 146
 147 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
 148    not just because the tree inliner turned us off.  */
 149
 150 extern int flag_really_no_inline;
 151
 152 /* Nonzero if we are only using compiler to check syntax errors.  */
 153
 154 extern int rtl_dump_and_exit;
 155
 156 /* Nonzero means we should save auxiliary info into a .X file.  */
 157
 158 extern int flag_gen_aux_info;
 159
 160 /* Nonzero means suppress output of instruction numbers and line number
 161    notes in debugging dumps.  */
 162
 163 extern int flag_dump_unnumbered;
 164
 165 /* Nonzero means change certain warnings into errors.
 166    Usually these are warnings about failure to conform to some standard.  */
 167
 168 extern int flag_pedantic_errors;
 169
 170 /* Nonzero if we are compiling code for a shared library, zero for
 171    executable.  */
 172
 173 extern int flag_shlib;
 174
 175 /* -dA causes debug information to be produced in
 176    the generated assembly code (to make it more readable).  This option
 177    is generally only of use to those who actually need to read the
 178    generated assembly code (perhaps while debugging the compiler itself).
 179    Currently, this switch is only used by dwarfout.c; however, it is intended
 180    to be a catchall for printing debug information in the assembler file.  */
 181
 182 extern int flag_debug_asm;
 183
 184 /* Generate code for GNU or NeXT Objective-C runtime environment.  */
 185
 186 extern int flag_next_runtime;
 187
 188 extern int flag_dump_rtl_in_asm;
 189
 190 /* If one, renumber instruction UIDs to reduce the number of
 191    unused UIDs if there are a lot of instructions.  If greater than
 192    one, unconditionally renumber instruction UIDs.  */
 193 extern int flag_renumber_insns;
 194 \f
 195 /* Other basic status info about current function.  */
 196
 197 /* Nonzero means current function must be given a frame pointer.
 198    Set in stmt.c if anything is allocated on the stack there.
 199    Set in reload1.c if anything is allocated on the stack there.  */
 200
 201 extern int frame_pointer_needed;
 202
 203 /* Nonzero if subexpressions must be evaluated from left-to-right.  */
 204 extern int flag_evaluation_order;
 205
 206 /* Value of the -G xx switch, and whether it was passed or not.  */
 207 extern unsigned HOST_WIDE_INT g_switch_value;
 208 extern bool g_switch_set;
 209
 210 /* Values of the -falign-* flags: how much to align labels in code.
 211    0 means `use default', 1 means `don't align'.
 212    For each variable, there is an _log variant which is the power
 213    of two not less than the variable, for .align output.  */
 214
 215 extern int align_loops_log;
 216 extern int align_loops_max_skip;
 217 extern int align_jumps_log;
 218 extern int align_jumps_max_skip;
 219 extern int align_labels_log;
 220 extern int align_labels_max_skip;
 221 extern int align_functions_log;
 222
 223 /* Like align_functions_log above, but used by front-ends to force the
 224    minimum function alignment.  Zero means no alignment is forced.  */
 225 extern int force_align_functions_log;
 226
 227 /* Nonzero if we dump in VCG format, not plain text.  */
 228 extern int dump_for_graph;
 229
 230 /* Selection of the graph form.  */
 231 enum graph_dump_types
 232 {
 233   no_graph = 0,
 234   vcg
 235 };
 236 extern enum graph_dump_types graph_dump_format;
 237
 238 /* Nonzero means to collect statistics which might be expensive
 239    and to print them when we are done.  */
 240 extern int flag_detailed_statistics;
 241
 242 /* Nonzero means that we defer emitting functions until they are actually
 243    used.  */
 244 extern int flag_remove_unreachable_functions;
 245
 246 /* Nonzero if we should track variables.  */
 247 extern int flag_var_tracking;
 248
 249 /* True if flag_speculative_prefetching was set by user.  Used to suppress
 250    warning message in case flag was set by -fprofile-{generate,use}.  */
 251 extern bool flag_speculative_prefetching_set;
 252
 253 /* A string that's used when a random name is required.  NULL means
 254    to make it really random.  */
 255
 256 extern const char *flag_random_seed;
 257
 258 /* Returns TRUE if generated code should match ABI version N or
 259    greater is in use.  */
 260
 261 #define abi_version_at_least(N) \
 262   (flag_abi_version == 0 || flag_abi_version >= (N))
 263
 264 /* True if the given mode has a NaN representation and the treatment of
 265    NaN operands is important.  Certain optimizations, such as folding
 266    x * 0 into x, are not correct for NaN operands, and are normally
 267    disabled for modes with NaNs.  The user can ask for them to be
 268    done anyway using the -funsafe-math-optimizations switch.  */
 269 #define HONOR_NANS(MODE) \
 270   (MODE_HAS_NANS (MODE) && !flag_finite_math_only)
 271
 272 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs).  */
 273 #define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
 274
 275 /* As for HONOR_NANS, but true if the mode can represent infinity and
 276    the treatment of infinite values is important.  */
 277 #define HONOR_INFINITIES(MODE) \
 278   (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)
 279
 280 /* Like HONOR_NANS, but true if the given mode distinguishes between
 281    positive and negative zero, and the sign of zero is important.  */
 282 #define HONOR_SIGNED_ZEROS(MODE) \
 283   (MODE_HAS_SIGNED_ZEROS (MODE) && !flag_unsafe_math_optimizations)
 284
 285 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
 286    and the rounding mode is important.  */
 287 #define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
 288   (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
 289
 290 #endif /* ! GCC_FLAGS_H */