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 3, 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 COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
25 #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 /* Used to set the level of -Wstrict-aliasing, when no level is specified.
120 The external way to set the default level is to use
121 -Wstrict-aliasing=level.
122 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
123 and 0 otherwise. After calling this function, wstrict_aliasing will be
124 set to the default value of -Wstrict_aliasing=level. */
126 extern void set_Wstrict_aliasing (int onoff
);
128 /* Nonzero means warn about any objects definitions whose size is larger
129 than N bytes. Also want about function definitions whose returned
130 values are larger than N bytes. The value N is in `larger_than_size'. */
132 extern bool warn_larger_than
;
133 extern HOST_WIDE_INT larger_than_size
;
135 /* Nonzero means warn about any function whose frame size is larger
138 extern bool warn_frame_larger_than
;
139 extern HOST_WIDE_INT frame_larger_than_size
;
141 /* Nonzero for -dp: annotate the assembly with a comment describing the
142 pattern and alternative used. */
144 extern int flag_print_asm_name
;
146 /* Now the symbols that are set with `-f' switches. */
148 /* Nonzero means `char' should be signed. */
150 extern int flag_signed_char
;
152 /* Nonzero means give an enum type only as many bytes as it needs. A value
153 of 2 means it has not yet been initialized. */
155 extern int flag_short_enums
;
157 /* Nonzero for -fpcc-struct-return: return values the same way PCC does. */
159 extern int flag_pcc_struct_return
;
161 /* 0 means straightforward implementation of complex divide acceptable.
162 1 means wide ranges of inputs must work for complex divide.
163 2 means C99-like requirements for complex multiply and divide. */
165 extern int flag_complex_method
;
167 /* Nonzero if we are only using compiler to check syntax errors. */
169 extern int rtl_dump_and_exit
;
171 /* Nonzero means we should save auxiliary info into a .X file. */
173 extern int flag_gen_aux_info
;
175 /* Nonzero means suppress output of instruction numbers and line number
176 notes in debugging dumps. */
178 extern int flag_dump_unnumbered
;
180 /* Nonzero means change certain warnings into errors.
181 Usually these are warnings about failure to conform to some standard. */
183 extern int flag_pedantic_errors
;
185 /* Nonzero means make permerror produce warnings instead of errors. */
187 extern int flag_permissive
;
189 /* Nonzero if we are compiling code for a shared library, zero for
192 extern int flag_shlib
;
194 /* -dA causes debug information to be produced in
195 the generated assembly code (to make it more readable). This option
196 is generally only of use to those who actually need to read the
197 generated assembly code (perhaps while debugging the compiler itself).
198 Currently, this switch is only used by dwarfout.c; however, it is intended
199 to be a catchall for printing debug information in the assembler file. */
201 extern int flag_debug_asm
;
203 /* Generate code for GNU or NeXT Objective-C runtime environment. */
205 extern int flag_next_runtime
;
207 extern int flag_dump_rtl_in_asm
;
209 /* Other basic status info about current function. */
211 /* Nonzero if subexpressions must be evaluated from left-to-right. */
212 extern int flag_evaluation_order
;
214 /* Value of the -G xx switch, and whether it was passed or not. */
215 extern unsigned HOST_WIDE_INT g_switch_value
;
216 extern bool g_switch_set
;
218 /* Values of the -falign-* flags: how much to align labels in code.
219 0 means `use default', 1 means `don't align'.
220 For each variable, there is an _log variant which is the power
221 of two not less than the variable, for .align output. */
223 extern int align_loops_log
;
224 extern int align_loops_max_skip
;
225 extern int align_jumps_log
;
226 extern int align_jumps_max_skip
;
227 extern int align_labels_log
;
228 extern int align_labels_max_skip
;
229 extern int align_functions_log
;
231 /* Nonzero if we dump in VCG format, not plain text. */
232 extern int dump_for_graph
;
234 /* Selection of the graph form. */
235 enum graph_dump_types
240 extern enum graph_dump_types graph_dump_format
;
242 /* Nonzero means to collect statistics which might be expensive
243 and to print them when we are done. */
244 extern int flag_detailed_statistics
;
246 /* Nonzero means that we defer emitting functions until they are actually
248 extern int flag_remove_unreachable_functions
;
250 /* Nonzero if we should track variables. */
251 extern int flag_var_tracking
;
253 /* True if flag_speculative_prefetching was set by user. Used to suppress
254 warning message in case flag was set by -fprofile-{generate,use}. */
255 extern bool flag_speculative_prefetching_set
;
257 /* Returns TRUE if generated code should match ABI version N or
258 greater is in use. */
260 #define abi_version_at_least(N) \
261 (flag_abi_version == 0 || flag_abi_version >= (N))
263 /* Return whether the function should be excluded from
265 extern bool flag_instrument_functions_exclude_p (tree fndecl
);
267 /* Emit warning if the function call is disallowed under
268 -Wdisallowed-function-list=... */
269 extern void warn_if_disallowed_function_p (const_tree fncall
);
271 /* True, if the -Wdisallowed-function-list=... option has been specified. */
272 extern bool warn_disallowed_functions
;
274 /* True if the given mode has a NaN representation and the treatment of
275 NaN operands is important. Certain optimizations, such as folding
276 x * 0 into 0, are not correct for NaN operands, and are normally
277 disabled for modes with NaNs. The user can ask for them to be
278 done anyway using the -funsafe-math-optimizations switch. */
279 #define HONOR_NANS(MODE) \
280 (MODE_HAS_NANS (MODE) && !flag_finite_math_only)
282 /* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs). */
283 #define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))
285 /* As for HONOR_NANS, but true if the mode can represent infinity and
286 the treatment of infinite values is important. */
287 #define HONOR_INFINITIES(MODE) \
288 (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)
290 /* Like HONOR_NANS, but true if the given mode distinguishes between
291 positive and negative zero, and the sign of zero is important. */
292 #define HONOR_SIGNED_ZEROS(MODE) \
293 (MODE_HAS_SIGNED_ZEROS (MODE) && flag_signed_zeros)
295 /* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
296 and the rounding mode is important. */
297 #define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
298 (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
300 /* True if overflow wraps around for the given integral type. That
301 is, TYPE_MAX + 1 == TYPE_MIN. */
302 #define TYPE_OVERFLOW_WRAPS(TYPE) \
303 (TYPE_UNSIGNED (TYPE) || flag_wrapv)
305 /* True if overflow is undefined for the given integral type. We may
306 optimize on the assumption that values in the type never overflow.
308 IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
309 must issue a warning based on warn_strict_overflow. In some cases
310 it will be appropriate to issue the warning immediately, and in
311 other cases it will be appropriate to simply set a flag and let the
312 caller decide whether a warning is appropriate or not. */
313 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
314 (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
316 /* True if overflow for the given integral type should issue a
318 #define TYPE_OVERFLOW_TRAPS(TYPE) \
319 (!TYPE_UNSIGNED (TYPE) && flag_trapv)
321 /* True if pointer types have undefined overflow. */
322 #define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
324 /* Names for the different levels of -Wstrict-overflow=N. The numeric
325 values here correspond to N. */
327 enum warn_strict_overflow_code
329 /* Overflow warning that should be issued with -Wall: a questionable
330 construct that is easy to avoid even when using macros. Example:
331 folding (x + CONSTANT > x) to 1. */
332 WARN_STRICT_OVERFLOW_ALL
= 1,
333 /* Overflow warning about folding a comparison to a constant because
334 of undefined signed overflow, other than cases covered by
335 WARN_STRICT_OVERFLOW_ALL. Example: folding (abs (x) >= 0) to 1
336 (this is false when x == INT_MIN). */
337 WARN_STRICT_OVERFLOW_CONDITIONAL
= 2,
338 /* Overflow warning about changes to comparisons other than folding
339 them to a constant. Example: folding (x + 1 > 1) to (x > 0). */
340 WARN_STRICT_OVERFLOW_COMPARISON
= 3,
341 /* Overflow warnings not covered by the above cases. Example:
342 folding ((x * 10) / 5) to (x * 2). */
343 WARN_STRICT_OVERFLOW_MISC
= 4,
344 /* Overflow warnings about reducing magnitude of constants in
345 comparison. Example: folding (x + 2 > y) to (x + 1 >= y). */
346 WARN_STRICT_OVERFLOW_MAGNITUDE
= 5
349 /* Whether to emit an overflow warning whose code is C. */
350 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
352 #endif /* ! GCC_FLAGS_H */