/* Compilation switch flag definitions for GCC.
Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002,
- 2003, 2004, 2005
+ 2003, 2004, 2005, 2006, 2007
Free Software Foundation, Inc.
This file is part of GCC.
#ifndef GCC_FLAGS_H
#define GCC_FLAGS_H
+#include "coretypes.h"
#include "options.h"
enum debug_info_type
/* Specify how much debugging info to generate. */
extern enum debug_info_level debug_info_level;
+/* A major contribution to object and executable size is debug
+ information size. A major contribution to debug information
+ size is struct descriptions replicated in several object files.
+ The following function determines whether or not debug information
+ should be generated for a given struct. The indirect parameter
+ indicates that the struct is being handled indirectly, via
+ a pointer. See opts.c for the implementation. */
+
+enum debug_info_usage
+{
+ DINFO_USAGE_DFN, /* A struct definition. */
+ DINFO_USAGE_DIR_USE, /* A direct use, such as the type of a variable. */
+ DINFO_USAGE_IND_USE, /* An indirect use, such as through a pointer. */
+ DINFO_USAGE_NUM_ENUMS /* The number of enumerators. */
+};
+
+extern bool should_emit_struct_debug (tree type_decl, enum debug_info_usage);
+extern void set_struct_debug_option (const char *value);
+
/* Nonzero means use GNU-only extensions in the generated symbolic
debugging information. */
extern bool use_gnu_debug_info_extensions;
extern int warn_strict_aliasing;
+/* Nonzero means warn about optimizations which rely on undefined
+ signed overflow. */
+
+extern int warn_strict_overflow;
+
/* Temporarily suppress certain warnings.
This is set while reading code from a system header file. */
extern int flag_next_runtime;
extern int flag_dump_rtl_in_asm;
-
-/* If one, renumber instruction UIDs to reduce the number of
- unused UIDs if there are a lot of instructions. If greater than
- one, unconditionally renumber instruction UIDs. */
-extern int flag_renumber_insns;
\f
/* Other basic status info about current function. */
warning message in case flag was set by -fprofile-{generate,use}. */
extern bool flag_speculative_prefetching_set;
-/* A string that's used when a random name is required. NULL means
- to make it really random. */
-
-extern const char *flag_random_seed;
-
/* Returns TRUE if generated code should match ABI version N or
greater is in use. */
/* Like HONOR_NANS, but true if the given mode distinguishes between
positive and negative zero, and the sign of zero is important. */
#define HONOR_SIGNED_ZEROS(MODE) \
- (MODE_HAS_SIGNED_ZEROS (MODE) && !flag_unsafe_math_optimizations)
+ (MODE_HAS_SIGNED_ZEROS (MODE) && flag_signed_zeros)
/* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
and the rounding mode is important. */
#define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \
(MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)
+/* True if overflow wraps around for the given integral type. That
+ is, TYPE_MAX + 1 == TYPE_MIN. */
+#define TYPE_OVERFLOW_WRAPS(TYPE) \
+ (TYPE_UNSIGNED (TYPE) || flag_wrapv)
+
+/* True if overflow is undefined for the given integral type. We may
+ optimize on the assumption that values in the type never overflow.
+
+ IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
+ must issue a warning based on warn_strict_overflow. In some cases
+ it will be appropriate to issue the warning immediately, and in
+ other cases it will be appropriate to simply set a flag and let the
+ caller decide whether a warning is appropriate or not. */
+#define TYPE_OVERFLOW_UNDEFINED(TYPE) \
+ (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
+
+/* True if overflow for the given integral type should issue a
+ trap. */
+#define TYPE_OVERFLOW_TRAPS(TYPE) \
+ (!TYPE_UNSIGNED (TYPE) && flag_trapv)
+
+/* Names for the different levels of -Wstrict-overflow=N. The numeric
+ values here correspond to N. */
+
+enum warn_strict_overflow_code
+{
+ /* Overflow warning that should be issued with -Wall: a questionable
+ construct that is easy to avoid even when using macros. Example:
+ folding (x + CONSTANT > x) to 1. */
+ WARN_STRICT_OVERFLOW_ALL = 1,
+ /* Overflow warning about folding a comparison to a constant because
+ of undefined signed overflow, other than cases covered by
+ WARN_STRICT_OVERFLOW_ALL. Example: folding (abs (x) >= 0) to 1
+ (this is false when x == INT_MIN). */
+ WARN_STRICT_OVERFLOW_CONDITIONAL = 2,
+ /* Overflow warning about changes to comparisons other than folding
+ them to a constant. Example: folding (x + 1 > 1) to (x > 0). */
+ WARN_STRICT_OVERFLOW_COMPARISON = 3,
+ /* Overflow warnings not covered by the above cases. Example:
+ folding ((x * 10) / 5) to (x * 2). */
+ WARN_STRICT_OVERFLOW_MISC = 4,
+ /* Overflow warnings about reducing magnitude of constants in
+ comparison. Example: folding (x + 2 > y) to (x + 1 >= y). */
+ WARN_STRICT_OVERFLOW_MAGNITUDE = 5
+};
+
+/* Whether to emit an overflow warning whose code is C. */
+#define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
+
#endif /* ! GCC_FLAGS_H */
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