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 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 any function whose stack usage is larger 113 than N bytes. The value N is in `stack_larger_than_size'. */ 114 115 extern int warn_stack_larger_than; 116 extern HOST_WIDE_INT stack_larger_than_size; 117 118 /* Nonzero means warn about constructs which might not be strict 119 aliasing safe. */ 120 121 extern int warn_strict_aliasing; 122 123 /* Nonzero means warn about optimizations which rely on undefined 124 signed overflow. */ 125 126 extern int warn_strict_overflow; 127 128 /* Temporarily suppress certain warnings. 129 This is set while reading code from a system header file. */ 130 131 extern int in_system_header; 132 133 /* Nonzero for -dp: annotate the assembly with a comment describing the 134 pattern and alternative used. */ 135 136 extern int flag_print_asm_name; 137 138 /* Now the symbols that are set with `-f' switches. */ 139 140 /* Nonzero means `char' should be signed. */ 141 142 extern int flag_signed_char; 143 144 /* Nonzero means give an enum type only as many bytes as it needs. A value 145 of 2 means it has not yet been initialized. */ 146 147 extern int flag_short_enums; 148 149 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ 150 151 extern int flag_pcc_struct_return; 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 means that we don't want inlining by virtue of -fno-inline, 160 not just because the tree inliner turned us off. */ 161 162 extern int flag_really_no_inline; 163 164 /* Nonzero if we are only using compiler to check syntax errors. */ 165 166 extern int rtl_dump_and_exit; 167 168 /* Nonzero means we should save auxiliary info into a .X file. */ 169 170 extern int flag_gen_aux_info; 171 172 /* Nonzero means suppress output of instruction numbers and line number 173 notes in debugging dumps. */ 174 175 extern int flag_dump_unnumbered; 176 177 /* Nonzero means change certain warnings into errors. 178 Usually these are warnings about failure to conform to some standard. */ 179 180 extern int flag_pedantic_errors; 181 182 /* Nonzero if we are compiling code for a shared library, zero for 183 executable. */ 184 185 extern int flag_shlib; 186 187 /* -dA causes debug information to be produced in 188 the generated assembly code (to make it more readable). This option 189 is generally only of use to those who actually need to read the 190 generated assembly code (perhaps while debugging the compiler itself). 191 Currently, this switch is only used by dwarfout.c; however, it is intended 192 to be a catchall for printing debug information in the assembler file. */ 193 194 extern int flag_debug_asm; 195 196 /* Generate code for GNU or NeXT Objective-C runtime environment. */ 197 198 extern int flag_next_runtime; 199 200 extern int flag_dump_rtl_in_asm; 201 202 /* If one, renumber instruction UIDs to reduce the number of 203 unused UIDs if there are a lot of instructions. If greater than 204 one, unconditionally renumber instruction UIDs. */ 205 extern int flag_renumber_insns; 206 207 /* Other basic status info about current function. */ 208 209 /* Nonzero means current function must be given a frame pointer. 210 Set in stmt.c if anything is allocated on the stack there. 211 Set in reload1.c if anything is allocated on the stack there. */ 212 213 extern int frame_pointer_needed; 214 215 /* Nonzero if subexpressions must be evaluated from left-to-right. */ 216 extern int flag_evaluation_order; 217 218 /* Value of the -G xx switch, and whether it was passed or not. */ 219 extern unsigned HOST_WIDE_INT g_switch_value; 220 extern bool g_switch_set; 221 222 /* Values of the -falign-* flags: how much to align labels in code. 223 0 means `use default', 1 means `don't align'. 224 For each variable, there is an _log variant which is the power 225 of two not less than the variable, for .align output. */ 226 227 extern int align_loops_log; 228 extern int align_loops_max_skip; 229 extern int align_jumps_log; 230 extern int align_jumps_max_skip; 231 extern int align_labels_log; 232 extern int align_labels_max_skip; 233 extern int align_functions_log; 234 235 /* Like align_functions_log above, but used by front-ends to force the 236 minimum function alignment. Zero means no alignment is forced. */ 237 extern int force_align_functions_log; 238 239 /* Nonzero if we dump in VCG format, not plain text. */ 240 extern int dump_for_graph; 241 242 /* Selection of the graph form. */ 243 enum graph_dump_types 244 { 245 no_graph = 0, 246 vcg 247 }; 248 extern enum graph_dump_types graph_dump_format; 249 250 /* Nonzero means to collect statistics which might be expensive 251 and to print them when we are done. */ 252 extern int flag_detailed_statistics; 253 254 /* Nonzero means that we defer emitting functions until they are actually 255 used. */ 256 extern int flag_remove_unreachable_functions; 257 258 /* Nonzero if we should track variables. */ 259 extern int flag_var_tracking; 260 261 /* True if flag_speculative_prefetching was set by user. Used to suppress 262 warning message in case flag was set by -fprofile-{generate,use}. */ 263 extern bool flag_speculative_prefetching_set; 264 265 /* A string that's used when a random name is required. NULL means 266 to make it really random. */ 267 268 extern const char *flag_random_seed; 269 270 /* Returns TRUE if generated code should match ABI version N or 271 greater is in use. */ 272 273 #define abi_version_at_least(N) \ 274 (flag_abi_version == 0 || flag_abi_version >= (N)) 275 276 /* True if the given mode has a NaN representation and the treatment of 277 NaN operands is important. Certain optimizations, such as folding 278 x * 0 into 0, are not correct for NaN operands, and are normally 279 disabled for modes with NaNs. The user can ask for them to be 280 done anyway using the -funsafe-math-optimizations switch. */ 281 #define HONOR_NANS(MODE) \ 282 (MODE_HAS_NANS (MODE) && !flag_finite_math_only) 283 284 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */ 285 #define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE)) 286 287 /* As for HONOR_NANS, but true if the mode can represent infinity and 288 the treatment of infinite values is important. */ 289 #define HONOR_INFINITIES(MODE) \ 290 (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only) 291 292 /* Like HONOR_NANS, but true if the given mode distinguishes between 293 positive and negative zero, and the sign of zero is important. */ 294 #define HONOR_SIGNED_ZEROS(MODE) \ 295 (MODE_HAS_SIGNED_ZEROS (MODE) && !flag_unsafe_math_optimizations) 296 297 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding, 298 and the rounding mode is important. */ 299 #define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \ 300 (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math) 301 302 /* True if overflow wraps around for the given integral type. That 303 is, TYPE_MAX + 1 == TYPE_MIN. */ 304 #define TYPE_OVERFLOW_WRAPS(TYPE) \ 305 (TYPE_UNSIGNED (TYPE) || flag_wrapv) 306 307 /* True if overflow is undefined for the given integral type. We may 308 optimize on the assumption that values in the type never overflow. 309 310 IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED 311 must issue a warning based on warn_strict_overflow. In some cases 312 it will be appropriate to issue the warning immediately, and in 313 other cases it will be appropriate to simply set a flag and let the 314 caller decide whether a warning is appropriate or not. */ 315 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \ 316 (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow) 317 318 /* True if overflow for the given integral type should issue a 319 trap. */ 320 #define TYPE_OVERFLOW_TRAPS(TYPE) \ 321 (!TYPE_UNSIGNED (TYPE) && flag_trapv) 322 323 /* Names for the different levels of -Wstrict-overflow=N. The numeric 324 values here correspond to N. */ 325 326 enum warn_strict_overflow_code 327 { 328 /* Overflow warning that should be issued with -Wall: a questionable 329 construct that is easy to avoid even when using macros. Example: 330 folding (x + CONSTANT > x) to 1. */ 331 WARN_STRICT_OVERFLOW_ALL = 1, 332 /* Overflow warning about folding a comparison to a constant because 333 of undefined signed overflow, other than cases covered by 334 WARN_STRICT_OVERFLOW_ALL. Example: folding (abs (x) >= 0) to 1 335 (this is false when x == INT_MIN). */ 336 WARN_STRICT_OVERFLOW_CONDITIONAL = 2, 337 /* Overflow warning about changes to comparisons other than folding 338 them to a constant. Example: folding (x + 1 > 1) to (x > 0). */ 339 WARN_STRICT_OVERFLOW_COMPARISON = 3, 340 /* Overflow warnings not covered by the above cases. Example: 341 folding ((x * 10) / 5) to (x * 2). */ 342 WARN_STRICT_OVERFLOW_MISC = 4, 343 /* Overflow warnings about reducing magnitude of constants in 344 comparison. Example: folding (x + 2 > y) to (x + 1 >= y). */ 345 WARN_STRICT_OVERFLOW_MAGNITUDE = 5 346 }; 347 348 /* Whether to emit an overflow warning whose code is C. */ 349 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c)) 350 351 #endif /* ! GCC_FLAGS_H */ 352