flags.h revision 259694
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 6This file is part of GCC. 7 8GCC is free software; you can redistribute it and/or modify it under 9the terms of the GNU General Public License as published by the Free 10Software Foundation; either version 2, or (at your option) any later 11version. 12 13GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14WARRANTY; without even the implied warranty of MERCHANTABILITY or 15FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16for more details. 17 18You should have received a copy of the GNU General Public License 19along with GCC; see the file COPYING. If not, write to the Free 20Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 2102110-1301, USA. */ 22 23#ifndef GCC_FLAGS_H 24#define GCC_FLAGS_H 25 26#include "coretypes.h" 27#include "options.h" 28 29enum 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. */ 42extern enum debug_info_type write_symbols; 43 44/* Names of debug_info_type, for error messages. */ 45extern const char *const debug_type_names[]; 46 47enum 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. */ 56extern 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 66enum 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 74extern bool should_emit_struct_debug (tree type_decl, enum debug_info_usage); 75extern void set_struct_debug_option (const char *value); 76 77/* Nonzero means use GNU-only extensions in the generated symbolic 78 debugging information. */ 79extern bool use_gnu_debug_info_extensions; 80 81/* Enumerate visibility settings. This is deliberately ordered from most 82 to least visibility. */ 83#ifndef SYMBOL_VISIBILITY_DEFINED 84#define SYMBOL_VISIBILITY_DEFINED 85enum symbol_visibility 86{ 87 VISIBILITY_DEFAULT, 88 VISIBILITY_PROTECTED, 89 VISIBILITY_HIDDEN, 90 VISIBILITY_INTERNAL 91}; 92#endif 93 94/* The default visibility for all symbols (unless overridden). */ 95extern enum symbol_visibility default_visibility; 96 97struct visibility_flags 98{ 99 unsigned inpragma : 1; /* True when in #pragma GCC visibility. */ 100 unsigned inlines_hidden : 1; /* True when -finlineshidden in effect. */ 101}; 102 103/* Global visibility options. */ 104extern struct visibility_flags visibility_options; 105 106/* Nonzero means do optimizations. -opt. */ 107 108extern int optimize; 109 110/* Nonzero means optimize for size. -Os. */ 111 112extern int optimize_size; 113 114/* Do print extra warnings (such as for uninitialized variables). 115 -W/-Wextra. */ 116 117extern bool extra_warnings; 118 119/* Nonzero to warn about unused variables, functions et.al. Use 120 set_Wunused() to update the -Wunused-* flags that correspond to the 121 -Wunused option. */ 122 123extern void set_Wunused (int setting); 124 125/* Used to set the level of -Wstrict-aliasing, when no level is specified. 126 The external way to set the default level is to use 127 -Wstrict-aliasing=level. 128 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified, 129 and 0 otherwise. After calling this function, wstrict_aliasing will be 130 set to the default value of -Wstrict_aliasing=level. */ 131 132extern void set_warn_strict_aliasing (int onoff); 133 134/* Nonzero means warn about any objects definitions whose size is larger 135 than N bytes. Also want about function definitions whose returned 136 values are larger than N bytes. The value N is in `larger_than_size'. */ 137 138extern bool warn_larger_than; 139extern HOST_WIDE_INT larger_than_size; 140 141/* Nonzero means warn about any function whose frame size is larger 142 than N bytes. */ 143 144extern bool warn_frame_larger_than; 145extern HOST_WIDE_INT frame_larger_than_size; 146 147/* Nonzero means warn about constructs which might not be strict 148 aliasing safe. */ 149 150extern int warn_strict_aliasing; 151 152/* Nonzero means warn about optimizations which rely on undefined 153 signed overflow. */ 154 155extern int warn_strict_overflow; 156 157/* Temporarily suppress certain warnings. 158 This is set while reading code from a system header file. */ 159 160extern int in_system_header; 161 162/* Nonzero for -dp: annotate the assembly with a comment describing the 163 pattern and alternative used. */ 164 165extern int flag_print_asm_name; 166 167/* Now the symbols that are set with `-f' switches. */ 168 169/* Nonzero means `char' should be signed. */ 170 171extern int flag_signed_char; 172 173/* Nonzero means give an enum type only as many bytes as it needs. A value 174 of 2 means it has not yet been initialized. */ 175 176extern int flag_short_enums; 177 178/* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ 179 180extern int flag_pcc_struct_return; 181 182/* 0 means straightforward implementation of complex divide acceptable. 183 1 means wide ranges of inputs must work for complex divide. 184 2 means C99-like requirements for complex multiply and divide. */ 185 186extern int flag_complex_method; 187 188/* Nonzero means that we don't want inlining by virtue of -fno-inline, 189 not just because the tree inliner turned us off. */ 190 191extern int flag_really_no_inline; 192 193/* Nonzero if we are only using compiler to check syntax errors. */ 194 195extern int rtl_dump_and_exit; 196 197/* Nonzero means we should save auxiliary info into a .X file. */ 198 199extern int flag_gen_aux_info; 200 201/* Nonzero means suppress output of instruction numbers and line number 202 notes in debugging dumps. */ 203 204extern int flag_dump_unnumbered; 205 206/* Nonzero means change certain warnings into errors. 207 Usually these are warnings about failure to conform to some standard. */ 208 209extern int flag_pedantic_errors; 210 211/* Nonzero if we are compiling code for a shared library, zero for 212 executable. */ 213 214extern int flag_shlib; 215 216/* -dA causes debug information to be produced in 217 the generated assembly code (to make it more readable). This option 218 is generally only of use to those who actually need to read the 219 generated assembly code (perhaps while debugging the compiler itself). 220 Currently, this switch is only used by dwarfout.c; however, it is intended 221 to be a catchall for printing debug information in the assembler file. */ 222 223extern int flag_debug_asm; 224 225/* Generate code for GNU or NeXT Objective-C runtime environment. */ 226 227extern int flag_next_runtime; 228 229extern int flag_dump_rtl_in_asm; 230 231/* If one, renumber instruction UIDs to reduce the number of 232 unused UIDs if there are a lot of instructions. If greater than 233 one, unconditionally renumber instruction UIDs. */ 234extern int flag_renumber_insns; 235 236/* Other basic status info about current function. */ 237 238/* Nonzero means current function must be given a frame pointer. 239 Set in stmt.c if anything is allocated on the stack there. 240 Set in reload1.c if anything is allocated on the stack there. */ 241 242extern int frame_pointer_needed; 243 244/* Nonzero if subexpressions must be evaluated from left-to-right. */ 245extern int flag_evaluation_order; 246 247/* Value of the -G xx switch, and whether it was passed or not. */ 248extern unsigned HOST_WIDE_INT g_switch_value; 249extern bool g_switch_set; 250 251/* Values of the -falign-* flags: how much to align labels in code. 252 0 means `use default', 1 means `don't align'. 253 For each variable, there is an _log variant which is the power 254 of two not less than the variable, for .align output. */ 255 256extern int align_loops_log; 257extern int align_loops_max_skip; 258extern int align_jumps_log; 259extern int align_jumps_max_skip; 260extern int align_labels_log; 261extern int align_labels_max_skip; 262extern int align_functions_log; 263 264/* Nonzero if we dump in VCG format, not plain text. */ 265extern int dump_for_graph; 266 267/* Selection of the graph form. */ 268enum graph_dump_types 269{ 270 no_graph = 0, 271 vcg 272}; 273extern enum graph_dump_types graph_dump_format; 274 275/* Nonzero means to collect statistics which might be expensive 276 and to print them when we are done. */ 277extern int flag_detailed_statistics; 278 279/* Nonzero means that we defer emitting functions until they are actually 280 used. */ 281extern int flag_remove_unreachable_functions; 282 283/* Nonzero if we should track variables. */ 284extern int flag_var_tracking; 285 286/* True if flag_speculative_prefetching was set by user. Used to suppress 287 warning message in case flag was set by -fprofile-{generate,use}. */ 288extern bool flag_speculative_prefetching_set; 289 290/* A string that's used when a random name is required. NULL means 291 to make it really random. */ 292 293extern const char *flag_random_seed; 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. */ 303extern bool flag_instrument_functions_exclude_p (tree fndecl); 304 305/* True if the given mode has a NaN representation and the treatment of 306 NaN operands is important. Certain optimizations, such as folding 307 x * 0 into 0, are not correct for NaN operands, and are normally 308 disabled for modes with NaNs. The user can ask for them to be 309 done anyway using the -funsafe-math-optimizations switch. */ 310#define HONOR_NANS(MODE) \ 311 (MODE_HAS_NANS (MODE) && !flag_finite_math_only) 312 313/* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */ 314#define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE)) 315 316/* As for HONOR_NANS, but true if the mode can represent infinity and 317 the treatment of infinite values is important. */ 318#define HONOR_INFINITIES(MODE) \ 319 (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only) 320 321/* Like HONOR_NANS, but true if the given mode distinguishes between 322 positive and negative zero, and the sign of zero is important. */ 323#define HONOR_SIGNED_ZEROS(MODE) \ 324 (MODE_HAS_SIGNED_ZEROS (MODE) && !flag_unsafe_math_optimizations) 325 326/* Like HONOR_NANS, but true if given mode supports sign-dependent rounding, 327 and the rounding mode is important. */ 328#define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \ 329 (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math) 330 331/* True if overflow wraps around for the given integral type. That 332 is, TYPE_MAX + 1 == TYPE_MIN. */ 333#define TYPE_OVERFLOW_WRAPS(TYPE) \ 334 (TYPE_UNSIGNED (TYPE) || flag_wrapv) 335 336/* True if overflow is undefined for the given integral type. We may 337 optimize on the assumption that values in the type never overflow. 338 339 IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED 340 must issue a warning based on warn_strict_overflow. In some cases 341 it will be appropriate to issue the warning immediately, and in 342 other cases it will be appropriate to simply set a flag and let the 343 caller decide whether a warning is appropriate or not. */ 344#define TYPE_OVERFLOW_UNDEFINED(TYPE) \ 345 (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow) 346 347/* True if overflow for the given integral type should issue a 348 trap. */ 349#define TYPE_OVERFLOW_TRAPS(TYPE) \ 350 (!TYPE_UNSIGNED (TYPE) && flag_trapv) 351 352/* Names for the different levels of -Wstrict-overflow=N. The numeric 353 values here correspond to N. */ 354 355enum warn_strict_overflow_code 356{ 357 /* Overflow warning that should be issued with -Wall: a questionable 358 construct that is easy to avoid even when using macros. Example: 359 folding (x + CONSTANT > x) to 1. */ 360 WARN_STRICT_OVERFLOW_ALL = 1, 361 /* Overflow warning about folding a comparison to a constant because 362 of undefined signed overflow, other than cases covered by 363 WARN_STRICT_OVERFLOW_ALL. Example: folding (abs (x) >= 0) to 1 364 (this is false when x == INT_MIN). */ 365 WARN_STRICT_OVERFLOW_CONDITIONAL = 2, 366 /* Overflow warning about changes to comparisons other than folding 367 them to a constant. Example: folding (x + 1 > 1) to (x > 0). */ 368 WARN_STRICT_OVERFLOW_COMPARISON = 3, 369 /* Overflow warnings not covered by the above cases. Example: 370 folding ((x * 10) / 5) to (x * 2). */ 371 WARN_STRICT_OVERFLOW_MISC = 4, 372 /* Overflow warnings about reducing magnitude of constants in 373 comparison. Example: folding (x + 2 > y) to (x + 1 >= y). */ 374 WARN_STRICT_OVERFLOW_MAGNITUDE = 5 375}; 376 377/* Whether to emit an overflow warning whose code is C. */ 378#define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c)) 379 380#endif /* ! GCC_FLAGS_H */ 381