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.
6 This file is part of GCC.
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
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
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
26 #include "coretypes.h"
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). */
41 /* Specify which kind of debugging info to generate. */
42 extern enum debug_info_type write_symbols;
44 /* Names of debug_info_type, for error messages. */
45 extern const char *const debug_type_names[];
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. */
55 /* Specify how much debugging info to generate. */
56 extern enum debug_info_level debug_info_level;
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. */
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. */
74 extern bool should_emit_struct_debug (tree type_decl, enum debug_info_usage);
75 extern void set_struct_debug_option (const char *value);
77 /* Nonzero means use GNU-only extensions in the generated symbolic
78 debugging information. */
79 extern bool use_gnu_debug_info_extensions;
81 /* Enumerate visibility settings. This is deliberately ordered from most
82 to least visibility. */
83 #ifndef SYMBOL_VISIBILITY_DEFINED
84 #define SYMBOL_VISIBILITY_DEFINED
85 enum symbol_visibility
94 /* The default visibility for all symbols (unless overridden). */
95 extern enum symbol_visibility default_visibility;
97 struct visibility_flags
99 unsigned inpragma : 1; /* True when in #pragma GCC visibility. */
100 unsigned inlines_hidden : 1; /* True when -finlineshidden in effect. */
103 /* Global visibility options. */
104 extern struct visibility_flags visibility_options;
106 /* Nonzero means do optimizations. -opt. */
110 /* Nonzero means optimize for size. -Os. */
112 extern int optimize_size;
114 /* Do print extra warnings (such as for uninitialized variables).
117 extern bool extra_warnings;
119 /* Nonzero to warn about unused variables, functions et.al. Use
120 set_Wunused() to update the -Wunused-* flags that correspond to the
123 extern void set_Wunused (int setting);
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. */
132 extern void set_warn_strict_aliasing (int onoff);
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'. */
138 extern bool warn_larger_than;
139 extern HOST_WIDE_INT larger_than_size;
141 /* Nonzero means warn about any function whose frame size is larger
144 extern bool warn_frame_larger_than;
145 extern HOST_WIDE_INT frame_larger_than_size;
147 /* Nonzero means warn about constructs which might not be strict
150 extern int warn_strict_aliasing;
152 /* Nonzero means warn about optimizations which rely on undefined
155 extern int warn_strict_overflow;
157 /* Temporarily suppress certain warnings.
158 This is set while reading code from a system header file. */
160 extern int in_system_header;
162 /* Nonzero for -dp: annotate the assembly with a comment describing the
163 pattern and alternative used. */
165 extern int flag_print_asm_name;
167 /* Now the symbols that are set with `-f' switches. */
169 /* Nonzero means `char' should be signed. */
171 extern int flag_signed_char;
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. */
176 extern int flag_short_enums;
178 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
180 extern int flag_pcc_struct_return;
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. */
186 extern int flag_complex_method;
188 /* Nonzero means that we don't want inlining by virtue of -fno-inline,
189 not just because the tree inliner turned us off. */
191 extern int flag_really_no_inline;
193 /* Nonzero if we are only using compiler to check syntax errors. */
195 extern int rtl_dump_and_exit;
197 /* Nonzero means we should save auxiliary info into a .X file. */
199 extern int flag_gen_aux_info;
201 /* Nonzero means suppress output of instruction numbers and line number
202 notes in debugging dumps. */
204 extern int flag_dump_unnumbered;
206 /* Nonzero means change certain warnings into errors.
207 Usually these are warnings about failure to conform to some standard. */
209 extern int flag_pedantic_errors;
211 /* Nonzero if we are compiling code for a shared library, zero for
214 extern int flag_shlib;
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. */
223 extern int flag_debug_asm;
225 /* Generate code for GNU or NeXT Objective-C runtime environment. */
227 extern int flag_next_runtime;
229 extern int flag_dump_rtl_in_asm;
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. */
234 extern int flag_renumber_insns;
236 /* Other basic status info about current function. */
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. */
242 extern int frame_pointer_needed;
244 /* Nonzero if subexpressions must be evaluated from left-to-right. */
245 extern int flag_evaluation_order;
247 /* Value of the -G xx switch, and whether it was passed or not. */
248 extern unsigned HOST_WIDE_INT g_switch_value;
249 extern bool g_switch_set;
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. */
256 extern int align_loops_log;
257 extern int align_loops_max_skip;
258 extern int align_jumps_log;
259 extern int align_jumps_max_skip;
260 extern int align_labels_log;
261 extern int align_labels_max_skip;
262 extern int align_functions_log;
264 /* Nonzero if we dump in VCG format, not plain text. */
265 extern int dump_for_graph;
267 /* Selection of the graph form. */
268 enum graph_dump_types
273 extern enum graph_dump_types graph_dump_format;
275 /* Nonzero means to collect statistics which might be expensive
276 and to print them when we are done. */
277 extern int flag_detailed_statistics;
279 /* Nonzero means that we defer emitting functions until they are actually
281 extern int flag_remove_unreachable_functions;
283 /* Nonzero if we should track variables. */
284 extern int flag_var_tracking;
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}. */
288 extern bool flag_speculative_prefetching_set;
290 /* A string that's used when a random name is required. NULL means
291 to make it really random. */
293 extern const char *flag_random_seed;
295 /* Returns TRUE if generated code should match ABI version N or
296 greater is in use. */
298 #define abi_version_at_least(N) \
299 (flag_abi_version == 0 || flag_abi_version >= (N))
301 /* Return whether the function should be excluded from
303 extern bool flag_instrument_functions_exclude_p (tree fndecl);
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)
313 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */
314 #define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
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)
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)
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)
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)
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.
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)
347 /* True if overflow for the given integral type should issue a
349 #define TYPE_OVERFLOW_TRAPS(TYPE) \
350 (!TYPE_UNSIGNED (TYPE) && flag_trapv)
352 /* Names for the different levels of -Wstrict-overflow=N. The numeric
353 values here correspond to N. */
355 enum warn_strict_overflow_code
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
377 /* Whether to emit an overflow warning whose code is C. */
378 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
380 #endif /* ! GCC_FLAGS_H */