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, 2008, 2009, 2010 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 3, 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 COPYING3. If not see 20<http://www.gnu.org/licenses/>. */ 21 22#ifndef GCC_FLAGS_H 23#define GCC_FLAGS_H 24 25#include "coretypes.h" 26#include "options.h" 27 28enum 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. */ 41extern enum debug_info_type write_symbols; 42 43/* Names of debug_info_type, for error messages. */ 44extern const char *const debug_type_names[]; 45 46enum 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. */ 55extern enum debug_info_level debug_info_level; 56 57/* A major contribution to object and executable size is debug 58 information size. A major contribution to debug information 59 size is struct descriptions replicated in several object files. 60 The following function determines whether or not debug information 61 should be generated for a given struct. The indirect parameter 62 indicates that the struct is being handled indirectly, via 63 a pointer. See opts.c for the implementation. */ 64 65enum debug_info_usage 66{ 67 DINFO_USAGE_DFN, /* A struct definition. */ 68 DINFO_USAGE_DIR_USE, /* A direct use, such as the type of a variable. */ 69 DINFO_USAGE_IND_USE, /* An indirect use, such as through a pointer. */ 70 DINFO_USAGE_NUM_ENUMS /* The number of enumerators. */ 71}; 72 73extern bool should_emit_struct_debug (tree type_decl, enum debug_info_usage); 74extern void set_struct_debug_option (const char *value); 75 76/* Nonzero means use GNU-only extensions in the generated symbolic 77 debugging information. */ 78extern bool use_gnu_debug_info_extensions; 79 80/* Enumerate visibility settings. This is deliberately ordered from most 81 to least visibility. */ 82#ifndef SYMBOL_VISIBILITY_DEFINED 83#define SYMBOL_VISIBILITY_DEFINED 84enum symbol_visibility 85{ 86 VISIBILITY_DEFAULT, 87 VISIBILITY_PROTECTED, 88 VISIBILITY_HIDDEN, 89 VISIBILITY_INTERNAL 90}; 91#endif 92 93/* The default visibility for all symbols (unless overridden). */ 94extern enum symbol_visibility default_visibility; 95 96struct visibility_flags 97{ 98 unsigned inpragma : 1; /* True when in #pragma GCC visibility. */ 99 unsigned inlines_hidden : 1; /* True when -finlineshidden in effect. */ 100}; 101 102/* Global visibility options. */ 103extern struct visibility_flags visibility_options; 104 105/* Nonzero means do optimizations. -opt. */ 106 107extern int optimize; 108 109/* Nonzero means optimize for size. -Os. */ 110 111extern int optimize_size; 112 113/* True if this is the LTO front end (lto1). This is used to disable 114 gimple generation and lowering passes that are normally run on the 115 output of a front end. These passes must be bypassed for lto since 116 they have already been done before the gimple was written. */ 117 118extern bool in_lto_p; 119 120/* Nonzero if we should write GIMPLE bytecode for link-time optimization. */ 121 122extern int flag_generate_lto; 123 124/* Used to set the level of -Wstrict-aliasing, when no level is specified. 125 The external way to set the default level is to use 126 -Wstrict-aliasing=level. 127 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified, 128 and 0 otherwise. After calling this function, wstrict_aliasing will be 129 set to the default value of -Wstrict_aliasing=level. */ 130 131extern void set_Wstrict_aliasing (int onoff); 132 133/* Nonzero means warn about any objects definitions whose size is larger 134 than N bytes. Also want about function definitions whose returned 135 values are larger than N bytes. The value N is in `larger_than_size'. */ 136 137extern bool warn_larger_than; 138extern HOST_WIDE_INT larger_than_size; 139 140/* Nonzero means warn about any function whose frame size is larger 141 than N bytes. */ 142 143extern bool warn_frame_larger_than; 144extern HOST_WIDE_INT frame_larger_than_size; 145 146/* Nonzero for -dp: annotate the assembly with a comment describing the 147 pattern and alternative used. */ 148 149extern int flag_print_asm_name; 150 151/* Now the symbols that are set with `-f' switches. */ 152 153/* Nonzero means `char' should be signed. */ 154 155extern int flag_signed_char; 156 157/* Nonzero means give an enum type only as many bytes as it needs. A value 158 of 2 means it has not yet been initialized. */ 159 160extern int flag_short_enums; 161 162/* Nonzero for -fpcc-struct-return: return values the same way PCC does. */ 163 164extern int flag_pcc_struct_return; 165 166/* 0 means straightforward implementation of complex divide acceptable. 167 1 means wide ranges of inputs must work for complex divide. 168 2 means C99-like requirements for complex multiply and divide. */ 169 170extern int flag_complex_method; 171 172/* Nonzero if we are only using compiler to check syntax errors. */ 173 174extern int rtl_dump_and_exit; 175 176/* Nonzero means we should save auxiliary info into a .X file. */ 177 178extern int flag_gen_aux_info; 179 180/* Nonzero means suppress output of instruction numbers and line number 181 notes in debugging dumps. */ 182 183extern int flag_dump_unnumbered; 184 185/* True if printing into -fdump-final-insns= dump. */ 186 187extern bool final_insns_dump_p; 188 189/* Nonzero means change certain warnings into errors. 190 Usually these are warnings about failure to conform to some standard. */ 191 192extern int flag_pedantic_errors; 193 194/* Nonzero means make permerror produce warnings instead of errors. */ 195 196extern int flag_permissive; 197 198/* Nonzero if we are compiling code for a shared library, zero for 199 executable. */ 200 201extern int flag_shlib; 202 203/* -dA causes debug information to be produced in 204 the generated assembly code (to make it more readable). This option 205 is generally only of use to those who actually need to read the 206 generated assembly code (perhaps while debugging the compiler itself). 207 Currently, this switch is only used by dwarfout.c; however, it is intended 208 to be a catchall for printing debug information in the assembler file. */ 209 210extern int flag_debug_asm; 211 212/* Generate code for GNU or NeXT Objective-C runtime environment. */ 213 214extern int flag_next_runtime; 215 216extern int flag_dump_rtl_in_asm; 217 218/* The algorithm used for the integrated register allocator (IRA). */ 219enum ira_algorithm 220{ 221 IRA_ALGORITHM_CB, 222 IRA_ALGORITHM_PRIORITY 223}; 224 225extern enum ira_algorithm flag_ira_algorithm; 226 227/* The regions used for the integrated register allocator (IRA). */ 228enum ira_region 229{ 230 IRA_REGION_ONE, 231 IRA_REGION_ALL, 232 IRA_REGION_MIXED 233}; 234 235extern enum ira_region flag_ira_region; 236 237extern unsigned int flag_ira_verbose; 238 239/* The options for excess precision. */ 240enum excess_precision 241{ 242 EXCESS_PRECISION_DEFAULT, 243 EXCESS_PRECISION_FAST, 244 EXCESS_PRECISION_STANDARD 245}; 246 247/* The excess precision specified on the command line, or defaulted by 248 the front end. */ 249extern enum excess_precision flag_excess_precision_cmdline; 250 251/* The excess precision currently in effect. */ 252extern enum excess_precision flag_excess_precision; 253 254 255/* Other basic status info about current function. */ 256 257/* Nonzero if subexpressions must be evaluated from left-to-right. */ 258extern int flag_evaluation_order; 259 260/* Value of the -G xx switch, and whether it was passed or not. */ 261extern unsigned HOST_WIDE_INT g_switch_value; 262extern bool g_switch_set; 263 264/* Same for selective scheduling. */ 265extern bool sel_sched_switch_set; 266 267/* Whether to run the warn_unused_result attribute pass. */ 268extern bool flag_warn_unused_result; 269 270/* Values of the -falign-* flags: how much to align labels in code. 271 0 means `use default', 1 means `don't align'. 272 For each variable, there is an _log variant which is the power 273 of two not less than the variable, for .align output. */ 274 275extern int align_loops_log; 276extern int align_loops_max_skip; 277extern int align_jumps_log; 278extern int align_jumps_max_skip; 279extern int align_labels_log; 280extern int align_labels_max_skip; 281extern int align_functions_log; 282 283/* Nonzero if we dump in VCG format, not plain text. */ 284extern int dump_for_graph; 285 286/* Selection of the graph form. */ 287enum graph_dump_types 288{ 289 no_graph = 0, 290 vcg 291}; 292extern enum graph_dump_types graph_dump_format; 293 294/* Nonzero means to collect statistics which might be expensive 295 and to print them when we are done. */ 296extern int flag_detailed_statistics; 297 298/* Nonzero means that we defer emitting functions until they are actually 299 used. */ 300extern int flag_remove_unreachable_functions; 301 302/* Nonzero if we should track variables. */ 303extern int flag_var_tracking; 304 305/* True if flag_speculative_prefetching was set by user. Used to suppress 306 warning message in case flag was set by -fprofile-{generate,use}. */ 307extern bool flag_speculative_prefetching_set; 308 309/* Type of stack check. */ 310enum stack_check_type 311{ 312 /* Do not check the stack. */ 313 NO_STACK_CHECK = 0, 314 315 /* Check the stack generically, i.e. assume no specific support 316 from the target configuration files. */ 317 GENERIC_STACK_CHECK, 318 319 /* Check the stack and rely on the target configuration files to 320 check the static frame of functions, i.e. use the generic 321 mechanism only for dynamic stack allocations. */ 322 STATIC_BUILTIN_STACK_CHECK, 323 324 /* Check the stack and entirely rely on the target configuration 325 files, i.e. do not use the generic mechanism at all. */ 326 FULL_BUILTIN_STACK_CHECK 327}; 328extern enum stack_check_type flag_stack_check; 329 330/* Returns TRUE if generated code should match ABI version N or 331 greater is in use. */ 332 333#define abi_version_at_least(N) \ 334 (flag_abi_version == 0 || flag_abi_version >= (N)) 335 336/* Return whether the function should be excluded from 337 instrumentation. */ 338extern bool flag_instrument_functions_exclude_p (tree fndecl); 339 340/* True if overflow wraps around for the given integral type. That 341 is, TYPE_MAX + 1 == TYPE_MIN. */ 342#define TYPE_OVERFLOW_WRAPS(TYPE) \ 343 (TYPE_UNSIGNED (TYPE) || flag_wrapv) 344 345/* True if overflow is undefined for the given integral type. We may 346 optimize on the assumption that values in the type never overflow. 347 348 IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED 349 must issue a warning based on warn_strict_overflow. In some cases 350 it will be appropriate to issue the warning immediately, and in 351 other cases it will be appropriate to simply set a flag and let the 352 caller decide whether a warning is appropriate or not. */ 353#define TYPE_OVERFLOW_UNDEFINED(TYPE) \ 354 (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow) 355 356/* True if overflow for the given integral type should issue a 357 trap. */ 358#define TYPE_OVERFLOW_TRAPS(TYPE) \ 359 (!TYPE_UNSIGNED (TYPE) && flag_trapv) 360 361/* True if pointer types have undefined overflow. */ 362#define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow) 363 364/* Names for the different levels of -Wstrict-overflow=N. The numeric 365 values here correspond to N. */ 366 367enum warn_strict_overflow_code 368{ 369 /* Overflow warning that should be issued with -Wall: a questionable 370 construct that is easy to avoid even when using macros. Example: 371 folding (x + CONSTANT > x) to 1. */ 372 WARN_STRICT_OVERFLOW_ALL = 1, 373 /* Overflow warning about folding a comparison to a constant because 374 of undefined signed overflow, other than cases covered by 375 WARN_STRICT_OVERFLOW_ALL. Example: folding (abs (x) >= 0) to 1 376 (this is false when x == INT_MIN). */ 377 WARN_STRICT_OVERFLOW_CONDITIONAL = 2, 378 /* Overflow warning about changes to comparisons other than folding 379 them to a constant. Example: folding (x + 1 > 1) to (x > 0). */ 380 WARN_STRICT_OVERFLOW_COMPARISON = 3, 381 /* Overflow warnings not covered by the above cases. Example: 382 folding ((x * 10) / 5) to (x * 2). */ 383 WARN_STRICT_OVERFLOW_MISC = 4, 384 /* Overflow warnings about reducing magnitude of constants in 385 comparison. Example: folding (x + 2 > y) to (x + 1 >= y). */ 386 WARN_STRICT_OVERFLOW_MAGNITUDE = 5 387}; 388 389/* Whether to emit an overflow warning whose code is C. */ 390#define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c)) 391 392#endif /* ! GCC_FLAGS_H */ 393