flags.h   [plain text]

/* Compilation switch flag definitions for GCC.
   Copyright (C) 1987, 1988, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002,
   2003, 2004, 2005, 2006, 2007
   Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to the Free
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.  */

#ifndef GCC_FLAGS_H
#define GCC_FLAGS_H

#include "options.h"

enum debug_info_type
  NO_DEBUG,	    /* Write no debug info.  */
  DBX_DEBUG,	    /* Write BSD .stabs for DBX (using dbxout.c).  */
  SDB_DEBUG,	    /* Write COFF for (old) SDB (using sdbout.c).  */
  DWARF2_DEBUG,	    /* Write Dwarf v2 debug info (using dwarf2out.c).  */
  XCOFF_DEBUG,	    /* Write IBM/Xcoff debug info (using dbxout.c).  */
  VMS_DEBUG,        /* Write VMS debug info (using vmsdbgout.c).  */
  VMS_AND_DWARF2_DEBUG /* Write VMS debug info (using vmsdbgout.c).
                          and DWARF v2 debug info (using dwarf2out.c).  */

/* Specify which kind of debugging info to generate.  */
extern enum debug_info_type write_symbols;

/* Names of debug_info_type, for error messages.  */
extern const char *const debug_type_names[];

enum debug_info_level
  DINFO_LEVEL_NONE,	/* Write no debugging info.  */
  DINFO_LEVEL_TERSE,	/* Write minimal info to support tracebacks only.  */
  DINFO_LEVEL_NORMAL,	/* Write info for all declarations (and line table).  */
  DINFO_LEVEL_VERBOSE	/* Write normal info plus #define/#undef info.  */

/* Specify how much debugging info to generate.  */
extern enum debug_info_level debug_info_level;

/* Nonzero means use GNU-only extensions in the generated symbolic
   debugging information.  */
extern bool use_gnu_debug_info_extensions;

/* Enumerate visibility settings.  This is deliberately ordered from most
   to least visibility.  */
enum symbol_visibility

/* The default visibility for all symbols (unless overridden).  */
extern enum symbol_visibility default_visibility;

struct visibility_flags
  unsigned inpragma : 1;	/* True when in #pragma GCC visibility.  */
  unsigned inlines_hidden : 1;	/* True when -finlineshidden in effect.  */

/* Global visibility options.  */
extern struct visibility_flags visibility_options;

/* APPLE LOCAL begin optimization pragmas 3124235/3420242 */
/* APPLE LOCAL end optimization pragmas 3124235/3420242 */
/* Do print extra warnings (such as for uninitialized variables).
   -W/-Wextra.  */

extern bool extra_warnings;

/* Nonzero to warn about unused variables, functions et.al.  Use
   set_Wunused() to update the -Wunused-* flags that correspond to the
   -Wunused option.  */

extern void set_Wunused (int setting);

/* Nonzero means warn about any objects definitions whose size is larger
   than N bytes.  Also want about function definitions whose returned
   values are larger than N bytes. The value N is in `larger_than_size'.  */

extern bool warn_larger_than;
extern HOST_WIDE_INT larger_than_size;

/* Nonzero means warn about constructs which might not be strict
   aliasing safe.  */

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 in_system_header;

/* Nonzero for -dp: annotate the assembly with a comment describing the
   pattern and alternative used.  */

extern int flag_print_asm_name;
/* Now the symbols that are set with `-f' switches.  */

/* Nonzero means `char' should be signed.  */

extern int flag_signed_char;

/* Nonzero means give an enum type only as many bytes as it needs.  A value
   of 2 means it has not yet been initialized.  */

extern int flag_short_enums;

/* Nonzero for -fpcc-struct-return: return values the same way PCC does.  */

extern int flag_pcc_struct_return;

/* APPLE LOCAL begin fwritable strings  */
/* Nonzero for -fwritable-strings:
   store string constants in data segment and don't uniquize them.  */

extern int flag_writable_strings;
/* APPLE LOCAL end fwritable strings  */

/* 0 means straightforward implementation of complex divide acceptable.
   1 means wide ranges of inputs must work for complex divide.
   2 means C99-like requirements for complex multiply and divide.  */

extern int flag_complex_method;

/* APPLE LOCAL begin -fobey-inline */
/* Nonzero for -fobey-inline: 'inline' keyword must be obeyed, regardless
   of codesize.  */

extern int flag_obey_inline;
/* APPLE LOCAL end -fobey-inline */

/* Nonzero means that we don't want inlining by virtue of -fno-inline,
   not just because the tree inliner turned us off.  */

extern int flag_really_no_inline;

/* Nonzero if we are only using compiler to check syntax errors.  */

extern int rtl_dump_and_exit;

/* Nonzero means we should save auxiliary info into a .X file.  */

extern int flag_gen_aux_info;

/* Nonzero means suppress output of instruction numbers and line number
   notes in debugging dumps.  */

extern int flag_dump_unnumbered;

/* Nonzero means change certain warnings into errors.
   Usually these are warnings about failure to conform to some standard.  */

extern int flag_pedantic_errors;

/* Nonzero if we are compiling code for a shared library, zero for
   executable.  */

extern int flag_shlib;

/* -dA causes debug information to be produced in
   the generated assembly code (to make it more readable).  This option
   is generally only of use to those who actually need to read the
   generated assembly code (perhaps while debugging the compiler itself).
   Currently, this switch is only used by dwarfout.c; however, it is intended
   to be a catchall for printing debug information in the assembler file.  */

extern int flag_debug_asm;

/* Generate code for GNU or NeXT Objective-C runtime environment.  */

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;
/* Other basic status info about current function.  */

/* Nonzero means current function must be given a frame pointer.
   Set in stmt.c if anything is allocated on the stack there.
   Set in reload1.c if anything is allocated on the stack there.  */

extern int frame_pointer_needed;

/* Nonzero if subexpressions must be evaluated from left-to-right.  */
extern int flag_evaluation_order;

/* Value of the -G xx switch, and whether it was passed or not.  */
extern unsigned HOST_WIDE_INT g_switch_value;
extern bool g_switch_set;

/* Values of the -falign-* flags: how much to align labels in code. 
   0 means `use default', 1 means `don't align'.  
   For each variable, there is an _log variant which is the power
   of two not less than the variable, for .align output.  */

extern int align_loops_log;
/* APPLE LOCAL begin optimization pragmas 4760857*/
/* remove align_loops_max_skip */
/* APPLE LOCAL end optimization pragmas 4760857*/
extern int align_jumps_log;
/* APPLE LOCAL begin optimization pragmas 4760857*/
/* remove align_jumps_max_skip */
/* APPLE LOCAL end optimization pragmas 4760857*/
extern int align_labels_log;
extern int align_labels_max_skip;
extern int align_functions_log;

/* APPLE LOCAL begin mainline aligned functions 5933878 */
/* Removed extern force_align_functions_log.  */
/* APPLE LOCAL end mainline aligned functions 5933878 */

/* Nonzero if we dump in VCG format, not plain text.  */
extern int dump_for_graph;

/* Selection of the graph form.  */
enum graph_dump_types
  no_graph = 0,
extern enum graph_dump_types graph_dump_format;

/* Nonzero means to collect statistics which might be expensive
   and to print them when we are done.  */
extern int flag_detailed_statistics;

/* Nonzero means that we defer emitting functions until they are actually
   used.  */
extern int flag_remove_unreachable_functions;

/* Nonzero if we should track variables.  */
extern int flag_var_tracking;

/* True if flag_speculative_prefetching was set by user.  Used to suppress
   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.  */

#define abi_version_at_least(N) \
  (flag_abi_version == 0 || flag_abi_version >= (N))

/* True if the given mode has a NaN representation and the treatment of
   NaN operands is important.  Certain optimizations, such as folding
   x * 0 into 0, are not correct for NaN operands, and are normally
   disabled for modes with NaNs.  The user can ask for them to be
   done anyway using the -funsafe-math-optimizations switch.  */
#define HONOR_NANS(MODE) \
  (MODE_HAS_NANS (MODE) && !flag_finite_math_only)

/* Like HONOR_NANs, but true if we honor signaling NaNs (or sNaNs).  */
#define HONOR_SNANS(MODE) (flag_signaling_nans && HONOR_NANS (MODE))

/* As for HONOR_NANS, but true if the mode can represent infinity and
   the treatment of infinite values is important.  */
  (MODE_HAS_INFINITIES (MODE) && !flag_finite_math_only)

/* Like HONOR_NANS, but true if the given mode distinguishes between
   positive and negative zero, and the sign of zero is important.  */
  (MODE_HAS_SIGNED_ZEROS (MODE) && !flag_unsafe_math_optimizations)

/* Like HONOR_NANS, but true if given mode supports sign-dependent rounding,
   and the rounding mode is important.  */
  (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && flag_rounding_math)

/* APPLE LOCAL begin -fast or -fastf or -fastcp */
/* Nonzero if we should perform SPEC oriented optimizations for C.  */
extern int flag_fast;
/* Nonzero if we should perform SPEC oriented optimizations for C that is
   produced by the NAG Fortan-to-C translator.  */
extern int flag_fastf;
/* Nonzero if we should perform SPEC oriented optimizations for C++.  */
extern int flag_fastcp;
/* APPLE LOCAL end -fast or -fastf or -fastcp */

/* APPLE LOCAL begin gdb only used symbols */
/* Nonzero if generating debugger info for used symbols only.  */
extern int flag_debug_only_used_symbols;
/* APPLE LOCAL end gdb only used symbols */

/* APPLE LOCAL begin predictive compilation */
extern int predictive_compilation;
/* APPLE LOCAL end predictive compilation */

/* APPLE LOCAL begin disable_typechecking_for_spec_flag */
extern int disable_typechecking_for_spec_flag;
/* APPLE LOCAL end disable_typechecking_for_spec_flag */

/* APPLE LOCAL begin Altivec */
extern int flag_disable_opts_for_faltivec;
/* APPLE LOCAL end Altivec */

/* APPLE LOCAL begin ss2 */
extern int flag_pch_file;
extern int flag_save_repository;
/* APPLE LOCAL end ss2 */

/* True if overflow wraps around for the given integral type.  That
   is, TYPE_MAX + 1 == TYPE_MIN.  */
  (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.

   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.  */
  (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)

/* True if overflow for the given integral type should issue a
   trap.  */
  (!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.  */
  /* 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).  */
  /* Overflow warning about changes to comparisons other than folding
     them to a constant.  Example: folding (x + 1 > 1) to (x > 0).  */
  /* Overflow warnings not covered by the above cases.  Example:
     folding ((x * 10) / 5) to (x * 2).  */
  /* Overflow warnings about reducing magnitude of constants in
     comparison.  Example: folding (x + 2 > y) to (x + 1 >= y).  */

/* 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 */