gcc/flags.h

   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.
   5
   6 This file is part of GCC.
   7
   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
  11 version.
  12
  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
  16 for more details.
  17
  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/>.  */
  21
  22 #ifndef GCC_FLAGS_H
  23 #define GCC_FLAGS_H
  24
  25 #include "coretypes.h"
  26 #include "flag-types.h"
  27 #include "options.h"
  28
  29 #if !defined(IN_LIBGCC2) && !defined(IN_TARGET_LIBS) && !defined(IN_RTS)
  30
  31 /* Names of debug_info_type, for error messages.  */
  32 extern const char *const debug_type_names[];
  33
  34 extern void strip_off_ending (char *, int);
  35 extern int base_of_path (const char *path, const char **base_out);
  36
  37 /* Run the second compilation of -fcompare-debug.  Not defined using
  38    Var in common.opt because this is used in Ada code and so must be
  39    an actual variable not a macro.  */
  40 extern int flag_compare_debug;
  41
  42 /* True if this is the LTO front end (lto1).  This is used to disable
  43    gimple generation and lowering passes that are normally run on the
  44    output of a front end.  These passes must be bypassed for lto since
  45    they have already been done before the gimple was written.  */
  46
  47 extern bool in_lto_p;
  48
  49 /* Return true iff flags are set as if -ffast-math.  */
  50 extern bool fast_math_flags_set_p (const struct gcc_options *);
  51 extern bool fast_math_flags_struct_set_p (struct cl_optimization *);
  52
  53 /* Used to set the level of -Wstrict-aliasing in OPTS, when no level
  54    is specified.  The external way to set the default level is to use
  55    -Wstrict-aliasing=level.
  56    ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified,
  57    and 0 otherwise.  After calling this function, wstrict_aliasing will be
  58    set to the default value of -Wstrict_aliasing=level.  */
  59
  60 extern void set_Wstrict_aliasing (struct gcc_options *opts, int onoff);
  61 \f
  62 /* Now the symbols that are set with `-f' switches.  */
  63
  64 /* True if printing into -fdump-final-insns= dump.  */
  65
  66 extern bool final_insns_dump_p;
  67
  68 /* Nonzero means make permerror produce warnings instead of errors.  */
  69
  70 extern int flag_permissive;
  71
  72 /* Generate code for GNU or NeXT Objective-C runtime environment.  */
  73
  74 extern int flag_next_runtime;
  75 \f
  76 /* Other basic status info about current function.  */
  77
  78 /* Target-dependent global state.  */
  79 struct target_flag_state {
  80   /* Values of the -falign-* flags: how much to align labels in code.
  81      0 means `use default', 1 means `don't align'.
  82      For each variable, there is an _log variant which is the power
  83      of two not less than the variable, for .align output.  */
  84   int x_align_loops_log;
  85   int x_align_loops_max_skip;
  86   int x_align_jumps_log;
  87   int x_align_jumps_max_skip;
  88   int x_align_labels_log;
  89   int x_align_labels_max_skip;
  90   int x_align_functions_log;
  91
  92   /* The excess precision currently in effect.  */
  93   enum excess_precision x_flag_excess_precision;
  94 };
  95
  96 extern struct target_flag_state default_target_flag_state;
  97 #if SWITCHABLE_TARGET
  98 extern struct target_flag_state *this_target_flag_state;
  99 #else
 100 #define this_target_flag_state (&default_target_flag_state)
 101 #endif
 102
 103 #define align_loops_log \
 104   (this_target_flag_state->x_align_loops_log)
 105 #define align_loops_max_skip \
 106   (this_target_flag_state->x_align_loops_max_skip)
 107 #define align_jumps_log \
 108   (this_target_flag_state->x_align_jumps_log)
 109 #define align_jumps_max_skip \
 110   (this_target_flag_state->x_align_jumps_max_skip)
 111 #define align_labels_log \
 112   (this_target_flag_state->x_align_labels_log)
 113 #define align_labels_max_skip \
 114   (this_target_flag_state->x_align_labels_max_skip)
 115 #define align_functions_log \
 116   (this_target_flag_state->x_align_functions_log)
 117 #define flag_excess_precision \
 118   (this_target_flag_state->x_flag_excess_precision)
 119
 120 /* Nonzero if we dump in VCG format, not plain text.  */
 121 extern int dump_for_graph;
 122
 123 extern enum stack_check_type flag_stack_check;
 124
 125 /* Returns TRUE if generated code should match ABI version N or
 126    greater is in use.  */
 127
 128 #define abi_version_at_least(N) \
 129   (flag_abi_version == 0 || flag_abi_version >= (N))
 130
 131 /* True if overflow wraps around for the given integral type.  That
 132    is, TYPE_MAX + 1 == TYPE_MIN.  */
 133 #define TYPE_OVERFLOW_WRAPS(TYPE) \
 134   (TYPE_UNSIGNED (TYPE) || flag_wrapv)
 135
 136 /* True if overflow is undefined for the given integral type.  We may
 137    optimize on the assumption that values in the type never overflow.
 138
 139    IMPORTANT NOTE: Any optimization based on TYPE_OVERFLOW_UNDEFINED
 140    must issue a warning based on warn_strict_overflow.  In some cases
 141    it will be appropriate to issue the warning immediately, and in
 142    other cases it will be appropriate to simply set a flag and let the
 143    caller decide whether a warning is appropriate or not.  */
 144 #define TYPE_OVERFLOW_UNDEFINED(TYPE) \
 145   (!TYPE_UNSIGNED (TYPE) && !flag_wrapv && !flag_trapv && flag_strict_overflow)
 146
 147 /* True if overflow for the given integral type should issue a
 148    trap.  */
 149 #define TYPE_OVERFLOW_TRAPS(TYPE) \
 150   (!TYPE_UNSIGNED (TYPE) && flag_trapv)
 151
 152 /* True if pointer types have undefined overflow.  */
 153 #define POINTER_TYPE_OVERFLOW_UNDEFINED (flag_strict_overflow)
 154
 155 /* Whether to emit an overflow warning whose code is C.  */
 156 #define issue_strict_overflow_warning(c) (warn_strict_overflow >= (int) (c))
 157
 158 #endif
 159
 160 #endif /* ! GCC_FLAGS_H */