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.
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"
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). */
40 /* Specify which kind of debugging info to generate. */
41 extern enum debug_info_type write_symbols
;
43 /* Names of debug_info_type, for error messages. */
44 extern const char *const debug_type_names
[];
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. */
54 /* Specify how much debugging info to generate. */
55 extern enum debug_info_level debug_info_level
;
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. */
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. */
73 extern bool should_emit_struct_debug (tree type_decl
, enum debug_info_usage
);
74 extern void set_struct_debug_option (const char *value
);
76 /* Nonzero means use GNU-only extensions in the generated symbolic
77 debugging information. */
78 extern bool use_gnu_debug_info_extensions
;
80 /* Run the second compilation of -fcompare-debug. Not defined using
81 Var in common.opt because this is used in Ada code and so must be
82 an actual variable not a macro. */
83 extern int flag_compare_debug
;
85 /* Enumerate visibility settings. This is deliberately ordered from most
86 to least visibility. */
87 #ifndef SYMBOL_VISIBILITY_DEFINED
88 #define SYMBOL_VISIBILITY_DEFINED
89 enum symbol_visibility
98 /* The default visibility for all symbols (unless overridden). */
99 extern enum symbol_visibility default_visibility
;
101 struct visibility_flags
103 unsigned inpragma
: 1; /* True when in #pragma GCC visibility. */
104 unsigned inlines_hidden
: 1; /* True when -finlineshidden in effect. */
107 /* Global visibility options. */
108 extern struct visibility_flags visibility_options
;
110 /* True if this is the LTO front end (lto1). This is used to disable
111 gimple generation and lowering passes that are normally run on the
112 output of a front end. These passes must be bypassed for lto since
113 they have already been done before the gimple was written. */
115 extern bool in_lto_p
;
117 /* Nonzero if we should write GIMPLE bytecode for link-time optimization. */
119 extern int flag_generate_lto
;
121 /* Used to set the level of -Wstrict-aliasing, when no level is specified.
122 The external way to set the default level is to use
123 -Wstrict-aliasing=level.
124 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
125 and 0 otherwise. After calling this function, wstrict_aliasing will be
126 set to the default value of -Wstrict_aliasing=level. */
128 extern void set_Wstrict_aliasing (int onoff
);
130 /* Nonzero means warn about any objects definitions whose size is larger
131 than N bytes. Also want about function definitions whose returned
132 values are larger than N bytes. The value N is in `larger_than_size'. */
134 extern bool warn_larger_than
;
135 extern HOST_WIDE_INT larger_than_size
;
137 /* Nonzero means warn about any function whose frame size is larger
140 extern bool warn_frame_larger_than
;
141 extern HOST_WIDE_INT frame_larger_than_size
;
143 /* Nonzero for -dp: annotate the assembly with a comment describing the
144 pattern and alternative used. */
146 extern int flag_print_asm_name
;
148 /* Now the symbols that are set with `-f' switches. */
150 /* 0 means straightforward implementation of complex divide acceptable.
151 1 means wide ranges of inputs must work for complex divide.
152 2 means C99-like requirements for complex multiply and divide. */
154 extern int flag_complex_method
;
156 /* Nonzero if we are only using compiler to check syntax errors. */
158 extern int rtl_dump_and_exit
;
160 /* Nonzero means we should save auxiliary info into a .X file. */
162 extern int flag_gen_aux_info
;
164 /* True if printing into -fdump-final-insns= dump. */
166 extern bool final_insns_dump_p
;
168 /* Nonzero means change certain warnings into errors.
169 Usually these are warnings about failure to conform to some standard. */
171 extern int flag_pedantic_errors
;
173 /* Nonzero means make permerror produce warnings instead of errors. */
175 extern int flag_permissive
;
177 /* Nonzero if we are compiling code for a shared library, zero for
180 extern int flag_shlib
;
182 /* -dA causes debug information to be produced in
183 the generated assembly code (to make it more readable). This option
184 is generally only of use to those who actually need to read the
185 generated assembly code (perhaps while debugging the compiler itself).
186 Currently, this switch is only used by dwarfout.c; however, it is intended
187 to be a catchall for printing debug information in the assembler file. */
189 extern int flag_debug_asm
;
191 /* Generate code for GNU or NeXT Objective-C runtime environment. */
193 extern int flag_next_runtime
;
195 extern int flag_dump_rtl_in_asm
;
197 /* The algorithm used for the integrated register allocator (IRA). */
201 IRA_ALGORITHM_PRIORITY
204 extern enum ira_algorithm flag_ira_algorithm
;
206 /* The regions used for the integrated register allocator (IRA). */
214 extern enum ira_region flag_ira_region
;
216 /* The options for excess precision. */
217 enum excess_precision
219 EXCESS_PRECISION_DEFAULT
,
220 EXCESS_PRECISION_FAST
,
221 EXCESS_PRECISION_STANDARD
224 /* The excess precision specified on the command line, or defaulted by
226 extern enum excess_precision flag_excess_precision_cmdline
;
228 /* Other basic status info about current function. */
230 /* Target-dependent global state. */
231 struct target_flag_state
{
232 /* Values of the -falign-* flags: how much to align labels in code.
233 0 means `use default', 1 means `don't align'.
234 For each variable, there is an _log variant which is the power
235 of two not less than the variable, for .align output. */
236 int x_align_loops_log
;
237 int x_align_loops_max_skip
;
238 int x_align_jumps_log
;
239 int x_align_jumps_max_skip
;
240 int x_align_labels_log
;
241 int x_align_labels_max_skip
;
242 int x_align_functions_log
;
244 /* The excess precision currently in effect. */
245 enum excess_precision x_flag_excess_precision
;
248 extern struct target_flag_state default_target_flag_state
;
249 #if SWITCHABLE_TARGET
250 extern struct target_flag_state
*this_target_flag_state
;
252 #define this_target_flag_state (&default_target_flag_state)
255 #define align_loops_log \
256 (this_target_flag_state->x_align_loops_log)
257 #define align_loops_max_skip \
258 (this_target_flag_state->x_align_loops_max_skip)
259 #define align_jumps_log \
260 (this_target_flag_state->x_align_jumps_log)
261 #define align_jumps_max_skip \
262 (this_target_flag_state->x_align_jumps_max_skip)
263 #define align_labels_log \
264 (this_target_flag_state->x_align_labels_log)
265 #define align_labels_max_skip \
266 (this_target_flag_state->x_align_labels_max_skip)
267 #define align_functions_log \
268 (this_target_flag_state->x_align_functions_log)
269 #define flag_excess_precision \
270 (this_target_flag_state->x_flag_excess_precision)
272 /* Nonzero if subexpressions must be evaluated from left-to-right. */
273 extern int flag_evaluation_order
;
275 /* Value of the -G xx switch, and whether it was passed or not. */
276 extern unsigned HOST_WIDE_INT g_switch_value
;
277 extern bool g_switch_set
;
279 /* Whether to run the warn_unused_result attribute pass. */
280 extern bool flag_warn_unused_result
;
282 /* Nonzero if we dump in VCG format, not plain text. */
283 extern int dump_for_graph
;
285 /* Selection of the graph form. */
286 enum graph_dump_types
291 extern enum graph_dump_types graph_dump_format
;
293 /* Type of stack check. */
294 enum stack_check_type
296 /* Do not check the stack. */
299 /* Check the stack generically, i.e. assume no specific support
300 from the target configuration files. */
303 /* Check the stack and rely on the target configuration files to
304 check the static frame of functions, i.e. use the generic
305 mechanism only for dynamic stack allocations. */
306 STATIC_BUILTIN_STACK_CHECK
,
308 /* Check the stack and entirely rely on the target configuration
309 files, i.e. do not use the generic mechanism at all. */
310 FULL_BUILTIN_STACK_CHECK
312 extern enum stack_check_type flag_stack_check
;
314 /* Returns TRUE if generated code should match ABI version N or
315 greater is in use. */
317 #define abi_version_at_least(N) \
318 (flag_abi_version == 0 || flag_abi_version >= (N))
320 /* Return whether the function should be excluded from
322 extern bool flag_instrument_functions_exclude_p (tree fndecl
);
324 /* True if overflow wraps around for the given integral type. That
325 is, TYPE_MAX + 1 == TYPE_MIN. */
326 #define TYPE_OVERFLOW_WRAPS(TYPE) \
327 (TYPE_UNSIGNED (TYPE) || flag_wrapv)
329 /* True if overflow is undefined for the given integral type. We may
330 optimize on the assumption that values in the type never overflow.
332 IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
333 must issue a warning based on warn_strict_overflow. In some cases
334 it will be appropriate to issue the warning immediately, and in
335 other cases it will be appropriate to simply set a flag and let the
336 caller decide whether a warning is appropriate or not. */
337 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
338 (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
340 /* True if overflow for the given integral type should issue a
342 #define TYPE_OVERFLOW_TRAPS(TYPE) \
343 (!TYPE_UNSIGNED (TYPE) && flag_trapv)
345 /* True if pointer types have undefined overflow. */
346 #define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
348 /* Names for the different levels of -Wstrict-overflow=N. The numeric
349 values here correspond to N. */
351 enum warn_strict_overflow_code
353 /* Overflow warning that should be issued with -Wall: a questionable
354 construct that is easy to avoid even when using macros. Example:
355 folding (x + CONSTANT > x) to 1. */
356 WARN_STRICT_OVERFLOW_ALL
= 1,
357 /* Overflow warning about folding a comparison to a constant because
358 of undefined signed overflow, other than cases covered by
359 WARN_STRICT_OVERFLOW_ALL. Example: folding (abs (x) >= 0) to 1
360 (this is false when x == INT_MIN). */
361 WARN_STRICT_OVERFLOW_CONDITIONAL
= 2,
362 /* Overflow warning about changes to comparisons other than folding
363 them to a constant. Example: folding (x + 1 > 1) to (x > 0). */
364 WARN_STRICT_OVERFLOW_COMPARISON
= 3,
365 /* Overflow warnings not covered by the above cases. Example:
366 folding ((x * 10) / 5) to (x * 2). */
367 WARN_STRICT_OVERFLOW_MISC
= 4,
368 /* Overflow warnings about reducing magnitude of constants in
369 comparison. Example: folding (x + 2 > y) to (x + 1 >= y). */
370 WARN_STRICT_OVERFLOW_MAGNITUDE
= 5
373 /* Whether to emit an overflow warning whose code is C. */
374 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
376 #endif /* ! GCC_FLAGS_H */