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.  This is deliberately ordered from most
  62    to least visibility.  */
  63 #ifndef SYMBOL_VISIBILITY_DEFINED
  64 #define SYMBOL_VISIBILITY_DEFINED
  65 enum symbol_visibility
  66 {
  67   VISIBILITY_DEFAULT,
  68   VISIBILITY_PROTECTED,
  69   VISIBILITY_HIDDEN,
  70   VISIBILITY_INTERNAL
  71 };
  72 #endif
  73
  74 /* The default visibility for all symbols (unless overridden).  */
  75 extern enum symbol_visibility default_visibility;
  76
  77 struct visibility_flags
  78 {
  79   unsigned inpragma : 1;        /* True when in #pragma GCC visibility.  */
  80   unsigned inlines_hidden : 1;  /* True when -finlineshidden in effect.  */
  81 };
  82
  83 /* Global visibility options.  */
  84 extern struct visibility_flags visibility_options;
  85
  86 /* Nonzero means do optimizations.  -opt.  */
  87
  88 extern int optimize;
  89
  90 /* Nonzero means optimize for size.  -Os.  */
  91
  92 extern int optimize_size;
  93
  94 /* Do print extra warnings (such as for uninitialized variables).
  95    -W/-Wextra.  */
  96
  97 extern bool extra_warnings;
  98
  99 /* Nonzero to warn about unused variables, functions et.al.  Use
 100    set_Wunused() to update the -Wunused-* flags that correspond to the
 101    -Wunused option.  */
 102
 103 extern void set_Wunused (int setting);
 104
 105 /* Nonzero means warn about any objects definitions whose size is larger
 106    than N bytes.  Also want about function definitions whose returned
 107    values are larger than N bytes. The value N is in `larger_than_size'.  */
 108
 109 extern bool warn_larger_than;
 110 extern HOST_WIDE_INT larger_than_size;
 111
 112 /* Nonzero means warn about constructs which might not be strict
 113    aliasing safe.  */
 114
 115 extern int warn_strict_aliasing;
 116
 117 /* Temporarily suppress certain warnings.
 118    This is set while reading code from a system header file.  */
 119
 120 extern int in_system_header;
 121
 122 /* Nonzero for -dp: annotate the assembly with a comment describing the
 123    pattern and alternative used.  */
 124
 125 extern int flag_print_asm_name;
 126 \f
 127 /* Now the symbols that are set with `-f' switches.  */
 128
 129 /* Nonzero means `char' should be signed.  */
 130
 131 extern int flag_signed_char;
 132
 133 /* Nonzero means give an enum type only as many bytes as it needs.  A value
 134    of 2 means it has not yet been initialized.  */
 135
 136 extern int flag_short_enums;
 137
 138 /* Nonzero for -fpcc-struct-return: return values the same way PCC does.  */
 139
 140 extern int flag_pcc_struct_return;
 141
 142 /* 0 means straightforward implementation of complex divide acceptable.
 143    1 means wide ranges of inputs must work for complex divide.
 144    2 means C99-like requirements for complex multiply and divide.  */
 145
 146 extern int flag_complex_method;
 147
 148 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
 149    not just because the tree inliner turned us off.  */
 150
 151 extern int flag_really_no_inline;
 152
 153 /* Nonzero if we are only using compiler to check syntax errors.  */
 154
 155 extern int rtl_dump_and_exit;
 156
 157 /* Nonzero means we should save auxiliary info into a .X file.  */
 158
 159 extern int flag_gen_aux_info;
 160
 161 /* Nonzero means suppress output of instruction numbers and line number
 162    notes in debugging dumps.  */
 163
 164 extern int flag_dump_unnumbered;
 165
 166 /* Nonzero means change certain warnings into errors.
 167    Usually these are warnings about failure to conform to some standard.  */
 168
 169 extern int flag_pedantic_errors;
 170
 171 /* Nonzero if we are compiling code for a shared library, zero for
 172    executable.  */
 173
 174 extern int flag_shlib;
 175
 176 /* -dA causes debug information to be produced in
 177    the generated assembly code (to make it more readable).  This option
 178    is generally only of use to those who actually need to read the
 179    generated assembly code (perhaps while debugging the compiler itself).
 180    Currently, this switch is only used by dwarfout.c; however, it is intended
 181    to be a catchall for printing debug information in the assembler file.  */
 182
 183 extern int flag_debug_asm;
 184
 185 /* Generate code for GNU or NeXT Objective-C runtime environment.  */
 186
 187 extern int flag_next_runtime;
 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 /* Nonzero means that we defer emitting functions until they are actually
 244    used.  */
 245 extern int flag_remove_unreachable_functions;
 246
 247 /* Nonzero if we should track variables.  */
 248 extern int flag_var_tracking;
 249
 250 /* True if flag_speculative_prefetching was set by user.  Used to suppress
 251    warning message in case flag was set by -fprofile-{generate,use}.  */
 252 extern bool flag_speculative_prefetching_set;
 253
 254 /* A string that's used when a random name is required.  NULL means
 255    to make it really random.  */
 256
 257 extern const char *flag_random_seed;
 258
 259 /* Returns TRUE if generated code should match ABI version N or
 260    greater is in use.  */
 261
 262 #define abi_version_at_least(N) \
 263   (flag_abi_version == 0 || flag_abi_version >= (N))
 264
 265 /* True if the given mode has a NaN representation and the treatment of
 266    NaN operands is important.  Certain optimizations, such as folding
 267    x * 0 into x, are not correct for NaN operands, and are normally
 268    disabled for modes with NaNs.  The user can ask for them to be
 269    done anyway using the -funsafe-math-optimizations switch.  */
 270 #define HONOR_NANS(MODE) \
 271   (MODE_HAS_NANS (MODE) && !flag_finite_math_only)
 272
 273 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs).  */
 274 #define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
 275
 276 /* As for HONOR_NANS, but true if the mode can represent infinity and
 277    the treatment of infinite values is important.  */
 278 #define HONOR_INFINITIES(MODE) \
 279   (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)
 280
 281 /* Like HONOR_NANS, but true if the given mode distinguishes between
 282    positive and negative zero, and the sign of zero is important.  */
 283 #define HONOR_SIGNED_ZEROS(MODE) \
 284   (MODE_HAS_SIGNED_ZEROS (MODE) && !flag_unsafe_math_optimizations)
 285
 286 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
 287    and the rounding mode is important.  */
 288 #define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
 289   (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
 290
 291 #endif /* ! GCC_FLAGS_H */