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opts.c
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/* Command line option handling.
Copyright (C) 2002-2020 Free Software Foundation, Inc.
Contributed by Neil Booth.
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 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "intl.h"
#include "coretypes.h"
#include "opts.h"
#include "tm.h"
#include "flags.h"
#include "diagnostic.h"
#include "opts-diagnostic.h"
#include "insn-attr-common.h"
#include "common/common-target.h"
#include "spellcheck.h"
#include "opt-suggestions.h"
#include "diagnostic-color.h"
#include "selftest.h"
static void set_Wstrict_aliasing (struct gcc_options *opts, int onoff);
/* Indexed by enum debug_info_type. */
const char *const debug_type_names[] =
{
"none", "stabs", "dwarf-2", "xcoff", "vms"
};
/* Parse the -femit-struct-debug-detailed option value
and set the flag variables. */
#define MATCH( prefix, string ) \
((strncmp (prefix, string, sizeof prefix - 1) == 0) \
? ((string += sizeof prefix - 1), 1) : 0)
void
set_struct_debug_option (struct gcc_options *opts, location_t loc,
const char *spec)
{
/* various labels for comparison */
static const char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:";
static const char ord_lbl[] = "ord:", gen_lbl[] = "gen:";
static const char none_lbl[] = "none", any_lbl[] = "any";
static const char base_lbl[] = "base", sys_lbl[] = "sys";
enum debug_struct_file files = DINFO_STRUCT_FILE_ANY;
/* Default is to apply to as much as possible. */
enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS;
int ord = 1, gen = 1;
/* What usage? */
if (MATCH (dfn_lbl, spec))
usage = DINFO_USAGE_DFN;
else if (MATCH (dir_lbl, spec))
usage = DINFO_USAGE_DIR_USE;
else if (MATCH (ind_lbl, spec))
usage = DINFO_USAGE_IND_USE;
/* Generics or not? */
if (MATCH (ord_lbl, spec))
gen = 0;
else if (MATCH (gen_lbl, spec))
ord = 0;
/* What allowable environment? */
if (MATCH (none_lbl, spec))
files = DINFO_STRUCT_FILE_NONE;
else if (MATCH (any_lbl, spec))
files = DINFO_STRUCT_FILE_ANY;
else if (MATCH (sys_lbl, spec))
files = DINFO_STRUCT_FILE_SYS;
else if (MATCH (base_lbl, spec))
files = DINFO_STRUCT_FILE_BASE;
else
error_at (loc,
"argument %qs to %<-femit-struct-debug-detailed%> "
"not recognized",
spec);
/* Effect the specification. */
if (usage == DINFO_USAGE_NUM_ENUMS)
{
if (ord)
{
opts->x_debug_struct_ordinary[DINFO_USAGE_DFN] = files;
opts->x_debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files;
opts->x_debug_struct_ordinary[DINFO_USAGE_IND_USE] = files;
}
if (gen)
{
opts->x_debug_struct_generic[DINFO_USAGE_DFN] = files;
opts->x_debug_struct_generic[DINFO_USAGE_DIR_USE] = files;
opts->x_debug_struct_generic[DINFO_USAGE_IND_USE] = files;
}
}
else
{
if (ord)
opts->x_debug_struct_ordinary[usage] = files;
if (gen)
opts->x_debug_struct_generic[usage] = files;
}
if (*spec == ',')
set_struct_debug_option (opts, loc, spec+1);
else
{
/* No more -femit-struct-debug-detailed specifications.
Do final checks. */
if (*spec != '\0')
error_at (loc,
"argument %qs to %<-femit-struct-debug-detailed%> unknown",
spec);
if (opts->x_debug_struct_ordinary[DINFO_USAGE_DIR_USE]
< opts->x_debug_struct_ordinary[DINFO_USAGE_IND_USE]
|| opts->x_debug_struct_generic[DINFO_USAGE_DIR_USE]
< opts->x_debug_struct_generic[DINFO_USAGE_IND_USE])
error_at (loc,
"%<-femit-struct-debug-detailed=dir:...%> must allow "
"at least as much as "
"%<-femit-struct-debug-detailed=ind:...%>");
}
}
/* Strip off a legitimate source ending from the input string NAME of
length LEN. Rather than having to know the names used by all of
our front ends, we strip off an ending of a period followed by
up to fource characters. (C++ uses ".cpp".) */
void
strip_off_ending (char *name, int len)
{
int i;
for (i = 2; i < 5 && len > i; i++)
{
if (name[len - i] == '.')
{
name[len - i] = '\0';
break;
}
}
}
/* Find the base name of a path, stripping off both directories and
a single final extension. */
int
base_of_path (const char *path, const char **base_out)
{
const char *base = path;
const char *dot = 0;
const char *p = path;
char c = *p;
while (c)
{
if (IS_DIR_SEPARATOR (c))
{
base = p + 1;
dot = 0;
}
else if (c == '.')
dot = p;
c = *++p;
}
if (!dot)
dot = p;
*base_out = base;
return dot - base;
}
/* What to print when a switch has no documentation. */
static const char undocumented_msg[] = N_("This option lacks documentation.");
static const char use_diagnosed_msg[] = N_("Uses of this option are diagnosed.");
typedef char *char_p; /* For DEF_VEC_P. */
static void set_debug_level (enum debug_info_type type, int extended,
const char *arg, struct gcc_options *opts,
struct gcc_options *opts_set,
location_t loc);
static void set_fast_math_flags (struct gcc_options *opts, int set);
static void decode_d_option (const char *arg, struct gcc_options *opts,
location_t loc, diagnostic_context *dc);
static void set_unsafe_math_optimizations_flags (struct gcc_options *opts,
int set);
static void enable_warning_as_error (const char *arg, int value,
unsigned int lang_mask,
const struct cl_option_handlers *handlers,
struct gcc_options *opts,
struct gcc_options *opts_set,
location_t loc,
diagnostic_context *dc);
/* Handle a back-end option; arguments and return value as for
handle_option. */
bool
target_handle_option (struct gcc_options *opts,
struct gcc_options *opts_set,
const struct cl_decoded_option *decoded,
unsigned int lang_mask ATTRIBUTE_UNUSED, int kind,
location_t loc,
const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED,
diagnostic_context *dc, void (*) (void))
{
gcc_assert (dc == global_dc);
gcc_assert (kind == DK_UNSPECIFIED);
return targetm_common.handle_option (opts, opts_set, decoded, loc);
}
/* Add comma-separated strings to a char_p vector. */
static void
add_comma_separated_to_vector (void **pvec, const char *arg)
{
char *tmp;
char *r;
char *w;
char *token_start;
vec<char_p> *v = (vec<char_p> *) *pvec;
vec_check_alloc (v, 1);
/* We never free this string. */
tmp = xstrdup (arg);
r = tmp;
w = tmp;
token_start = tmp;
while (*r != '\0')
{
if (*r == ',')
{
*w++ = '\0';
++r;
v->safe_push (token_start);
token_start = w;
}
if (*r == '\\' && r[1] == ',')
{
*w++ = ',';
r += 2;
}
else
*w++ = *r++;
}
*w = '\0';
if (*token_start != '\0')
v->safe_push (token_start);
*pvec = v;
}
/* Initialize opts_obstack. */
void
init_opts_obstack (void)
{
gcc_obstack_init (&opts_obstack);
}
/* Initialize OPTS and OPTS_SET before using them in parsing options. */
void
init_options_struct (struct gcc_options *opts, struct gcc_options *opts_set)
{
/* Ensure that opts_obstack has already been initialized by the time
that we initialize any gcc_options instances (PR jit/68446). */
gcc_assert (opts_obstack.chunk_size > 0);
*opts = global_options_init;
if (opts_set)
memset (opts_set, 0, sizeof (*opts_set));
/* Initialize whether `char' is signed. */
opts->x_flag_signed_char = DEFAULT_SIGNED_CHAR;
/* Set this to a special "uninitialized" value. The actual default
is set after target options have been processed. */
opts->x_flag_short_enums = 2;
/* Initialize target_flags before default_options_optimization
so the latter can modify it. */
opts->x_target_flags = targetm_common.default_target_flags;
/* Some targets have ABI-specified unwind tables. */
opts->x_flag_unwind_tables = targetm_common.unwind_tables_default;
/* Some targets have other target-specific initialization. */
targetm_common.option_init_struct (opts);
}
/* If indicated by the optimization level LEVEL (-Os if SIZE is set,
-Ofast if FAST is set, -Og if DEBUG is set), apply the option DEFAULT_OPT
to OPTS and OPTS_SET, diagnostic context DC, location LOC, with language
mask LANG_MASK and option handlers HANDLERS. */
static void
maybe_default_option (struct gcc_options *opts,
struct gcc_options *opts_set,
const struct default_options *default_opt,
int level, bool size, bool fast, bool debug,
unsigned int lang_mask,
const struct cl_option_handlers *handlers,
location_t loc,
diagnostic_context *dc)
{
const struct cl_option *option = &cl_options[default_opt->opt_index];
bool enabled;
if (size)
gcc_assert (level == 2);
if (fast)
gcc_assert (level == 3);
if (debug)
gcc_assert (level == 1);
switch (default_opt->levels)
{
case OPT_LEVELS_ALL:
enabled = true;
break;
case OPT_LEVELS_0_ONLY:
enabled = (level == 0);
break;
case OPT_LEVELS_1_PLUS:
enabled = (level >= 1);
break;
case OPT_LEVELS_1_PLUS_SPEED_ONLY:
enabled = (level >= 1 && !size && !debug);
break;
case OPT_LEVELS_1_PLUS_NOT_DEBUG:
enabled = (level >= 1 && !debug);
break;
case OPT_LEVELS_2_PLUS:
enabled = (level >= 2);
break;
case OPT_LEVELS_2_PLUS_SPEED_ONLY:
enabled = (level >= 2 && !size && !debug);
break;
case OPT_LEVELS_3_PLUS:
enabled = (level >= 3);
break;
case OPT_LEVELS_3_PLUS_AND_SIZE:
enabled = (level >= 3 || size);
break;
case OPT_LEVELS_SIZE:
enabled = size;
break;
case OPT_LEVELS_FAST:
enabled = fast;
break;
case OPT_LEVELS_NONE:
default:
gcc_unreachable ();
}
if (enabled)
handle_generated_option (opts, opts_set, default_opt->opt_index,
default_opt->arg, default_opt->value,
lang_mask, DK_UNSPECIFIED, loc,
handlers, true, dc);
else if (default_opt->arg == NULL
&& !option->cl_reject_negative
&& !(option->flags & CL_PARAMS))
handle_generated_option (opts, opts_set, default_opt->opt_index,
default_opt->arg, !default_opt->value,
lang_mask, DK_UNSPECIFIED, loc,
handlers, true, dc);
}
/* As indicated by the optimization level LEVEL (-Os if SIZE is set,
-Ofast if FAST is set), apply the options in array DEFAULT_OPTS to
OPTS and OPTS_SET, diagnostic context DC, location LOC, with
language mask LANG_MASK and option handlers HANDLERS. */
static void
maybe_default_options (struct gcc_options *opts,
struct gcc_options *opts_set,
const struct default_options *default_opts,
int level, bool size, bool fast, bool debug,
unsigned int lang_mask,
const struct cl_option_handlers *handlers,
location_t loc,
diagnostic_context *dc)
{
size_t i;
for (i = 0; default_opts[i].levels != OPT_LEVELS_NONE; i++)
maybe_default_option (opts, opts_set, &default_opts[i],
level, size, fast, debug,
lang_mask, handlers, loc, dc);
}
/* Table of options enabled by default at different levels.
Please keep this list sorted by level and alphabetized within
each level; this makes it easier to keep the documentation
in sync. */
static const struct default_options default_options_table[] =
{
/* -O1 and -Og optimizations. */
{ OPT_LEVELS_1_PLUS, OPT_fcombine_stack_adjustments, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fcompare_elim, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fcprop_registers, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fdefer_pop, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fforward_propagate, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fguess_branch_probability, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fipa_profile, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fipa_pure_const, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fipa_reference, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fipa_reference_addressable, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fmerge_constants, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_freorder_blocks, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fshrink_wrap, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_fsplit_wide_types, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_builtin_call_dce, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_ccp, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_ch, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_coalesce_vars, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_copy_prop, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_dce, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_dominator_opts, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_fre, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_sink, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_slsr, NULL, 1 },
{ OPT_LEVELS_1_PLUS, OPT_ftree_ter, NULL, 1 },
/* -O1 (and not -Og) optimizations. */
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fbranch_count_reg, NULL, 1 },
#if DELAY_SLOTS
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fdelayed_branch, NULL, 1 },
#endif
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fdse, NULL, 1 },
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fif_conversion, NULL, 1 },
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fif_conversion2, NULL, 1 },
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_finline_functions_called_once, NULL, 1 },
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fmove_loop_invariants, NULL, 1 },
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_fssa_phiopt, NULL, 1 },
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_bit_ccp, NULL, 1 },
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_dse, NULL, 1 },
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_pta, NULL, 1 },
{ OPT_LEVELS_1_PLUS_NOT_DEBUG, OPT_ftree_sra, NULL, 1 },
/* -O2 and -Os optimizations. */
{ OPT_LEVELS_2_PLUS, OPT_fcaller_saves, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fcode_hoisting, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fcrossjumping, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fcse_follow_jumps, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fdevirtualize, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fdevirtualize_speculatively, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fexpensive_optimizations, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fgcse, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fhoist_adjacent_loads, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_findirect_inlining, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_finline_small_functions, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fipa_bit_cp, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fipa_cp, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fipa_icf, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fipa_ra, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fipa_sra, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fipa_vrp, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fisolate_erroneous_paths_dereference, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_flra_remat, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_foptimize_sibling_calls, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fpartial_inlining, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fpeephole2, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_freorder_functions, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_frerun_cse_after_loop, NULL, 1 },
#ifdef INSN_SCHEDULING
{ OPT_LEVELS_2_PLUS, OPT_fschedule_insns2, NULL, 1 },
#endif
{ OPT_LEVELS_2_PLUS, OPT_fstrict_aliasing, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fstore_merging, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fthread_jumps, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_ftree_pre, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_ftree_switch_conversion, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_ftree_tail_merge, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_ftree_vrp, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_fvect_cost_model_, NULL, VECT_COST_MODEL_CHEAP },
{ OPT_LEVELS_2_PLUS, OPT_finline_functions, NULL, 1 },
{ OPT_LEVELS_2_PLUS, OPT_ftree_loop_distribute_patterns, NULL, 1 },
/* -O2 and above optimizations, but not -Os or -Og. */
{ OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_falign_functions, NULL, 1 },
{ OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_falign_jumps, NULL, 1 },
{ OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_falign_labels, NULL, 1 },
{ OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_falign_loops, NULL, 1 },
{ OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_foptimize_strlen, NULL, 1 },
{ OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_freorder_blocks_algorithm_, NULL,
REORDER_BLOCKS_ALGORITHM_STC },
#ifdef INSN_SCHEDULING
/* Only run the pre-regalloc scheduling pass if optimizing for speed. */
{ OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_fschedule_insns, NULL, 1 },
#endif
/* -O3 and -Os optimizations. */
/* -O3 optimizations. */
{ OPT_LEVELS_3_PLUS, OPT_fgcse_after_reload, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_fipa_cp_clone, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_floop_interchange, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_floop_unroll_and_jam, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_fpeel_loops, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_fpredictive_commoning, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_fsplit_loops, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_fsplit_paths, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_ftree_loop_distribution, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_ftree_loop_vectorize, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_ftree_partial_pre, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_ftree_slp_vectorize, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_funswitch_loops, NULL, 1 },
{ OPT_LEVELS_3_PLUS, OPT_fvect_cost_model_, NULL, VECT_COST_MODEL_DYNAMIC },
{ OPT_LEVELS_3_PLUS, OPT_fversion_loops_for_strides, NULL, 1 },
/* -O3 parameters. */
{ OPT_LEVELS_3_PLUS, OPT__param_max_inline_insns_auto_, NULL, 30 },
{ OPT_LEVELS_3_PLUS, OPT__param_early_inlining_insns_, NULL, 14 },
{ OPT_LEVELS_3_PLUS, OPT__param_inline_heuristics_hint_percent_, NULL, 600 },
{ OPT_LEVELS_3_PLUS, OPT__param_inline_min_speedup_, NULL, 15 },
{ OPT_LEVELS_3_PLUS, OPT__param_max_inline_insns_single_, NULL, 200 },
/* -Ofast adds optimizations to -O3. */
{ OPT_LEVELS_FAST, OPT_ffast_math, NULL, 1 },
{ OPT_LEVELS_FAST, OPT_fallow_store_data_races, NULL, 1 },
{ OPT_LEVELS_NONE, 0, NULL, 0 }
};
/* Default the options in OPTS and OPTS_SET based on the optimization
settings in DECODED_OPTIONS and DECODED_OPTIONS_COUNT. */
void
default_options_optimization (struct gcc_options *opts,
struct gcc_options *opts_set,
struct cl_decoded_option *decoded_options,
unsigned int decoded_options_count,
location_t loc,
unsigned int lang_mask,
const struct cl_option_handlers *handlers,
diagnostic_context *dc)
{
unsigned int i;
int opt2;
bool openacc_mode = false;
/* Scan to see what optimization level has been specified. That will
determine the default value of many flags. */
for (i = 1; i < decoded_options_count; i++)
{
struct cl_decoded_option *opt = &decoded_options[i];
switch (opt->opt_index)
{
case OPT_O:
if (*opt->arg == '\0')
{
opts->x_optimize = 1;
opts->x_optimize_size = 0;
opts->x_optimize_fast = 0;
opts->x_optimize_debug = 0;
}
else
{
const int optimize_val = integral_argument (opt->arg);
if (optimize_val == -1)
error_at (loc, "argument to %<-O%> should be a non-negative "
"integer, %<g%>, %<s%> or %<fast%>");
else
{
opts->x_optimize = optimize_val;
if ((unsigned int) opts->x_optimize > 255)
opts->x_optimize = 255;
opts->x_optimize_size = 0;
opts->x_optimize_fast = 0;
opts->x_optimize_debug = 0;
}
}
break;
case OPT_Os:
opts->x_optimize_size = 1;
/* Optimizing for size forces optimize to be 2. */
opts->x_optimize = 2;
opts->x_optimize_fast = 0;
opts->x_optimize_debug = 0;
break;
case OPT_Ofast:
/* -Ofast only adds flags to -O3. */
opts->x_optimize_size = 0;
opts->x_optimize = 3;
opts->x_optimize_fast = 1;
opts->x_optimize_debug = 0;
break;
case OPT_Og:
/* -Og selects optimization level 1. */
opts->x_optimize_size = 0;
opts->x_optimize = 1;
opts->x_optimize_fast = 0;
opts->x_optimize_debug = 1;
break;
case OPT_fopenacc:
if (opt->value)
openacc_mode = true;
break;
default:
/* Ignore other options in this prescan. */
break;
}
}
maybe_default_options (opts, opts_set, default_options_table,
opts->x_optimize, opts->x_optimize_size,
opts->x_optimize_fast, opts->x_optimize_debug,
lang_mask, handlers, loc, dc);
/* -O2 param settings. */
opt2 = (opts->x_optimize >= 2);
if (openacc_mode)
SET_OPTION_IF_UNSET (opts, opts_set, flag_ipa_pta, true);
/* Track fields in field-sensitive alias analysis. */
if (opt2)
SET_OPTION_IF_UNSET (opts, opts_set, param_max_fields_for_field_sensitive,
100);
if (opts->x_optimize_size)
/* We want to crossjump as much as possible. */
SET_OPTION_IF_UNSET (opts, opts_set, param_min_crossjump_insns, 1);
/* Restrict the amount of work combine does at -Og while retaining
most of its useful transforms. */
if (opts->x_optimize_debug)
SET_OPTION_IF_UNSET (opts, opts_set, param_max_combine_insns, 2);
/* Allow default optimizations to be specified on a per-machine basis. */
maybe_default_options (opts, opts_set,
targetm_common.option_optimization_table,
opts->x_optimize, opts->x_optimize_size,
opts->x_optimize_fast, opts->x_optimize_debug,
lang_mask, handlers, loc, dc);
}
/* Control IPA optimizations based on different live patching LEVEL. */
static void
control_options_for_live_patching (struct gcc_options *opts,
struct gcc_options *opts_set,
enum live_patching_level level,
location_t loc)
{
gcc_assert (level > LIVE_PATCHING_NONE);
switch (level)
{
case LIVE_PATCHING_INLINE_ONLY_STATIC:
if (opts_set->x_flag_ipa_cp_clone && opts->x_flag_ipa_cp_clone)
error_at (loc,
"%<-fipa-cp-clone%> is incompatible with "
"%<-flive-patching=inline-only-static%>");
else
opts->x_flag_ipa_cp_clone = 0;
if (opts_set->x_flag_ipa_sra && opts->x_flag_ipa_sra)
error_at (loc,
"%<-fipa-sra%> is incompatible with "
"%<-flive-patching=inline-only-static%>");
else
opts->x_flag_ipa_sra = 0;
if (opts_set->x_flag_partial_inlining && opts->x_flag_partial_inlining)
error_at (loc,
"%<-fpartial-inlining%> is incompatible with "
"%<-flive-patching=inline-only-static%>");
else
opts->x_flag_partial_inlining = 0;
if (opts_set->x_flag_ipa_cp && opts->x_flag_ipa_cp)
error_at (loc,
"%<-fipa-cp%> is incompatible with "
"%<-flive-patching=inline-only-static%>");
else
opts->x_flag_ipa_cp = 0;
/* FALLTHROUGH. */
case LIVE_PATCHING_INLINE_CLONE:
/* live patching should disable whole-program optimization. */
if (opts_set->x_flag_whole_program && opts->x_flag_whole_program)
error_at (loc,
"%<-fwhole-program%> is incompatible with "
"%<-flive-patching=inline-only-static|inline-clone%>");
else
opts->x_flag_whole_program = 0;
/* visibility change should be excluded by !flag_whole_program
&& !in_lto_p && !flag_ipa_cp_clone && !flag_ipa_sra
&& !flag_partial_inlining. */
if (opts_set->x_flag_ipa_pta && opts->x_flag_ipa_pta)
error_at (loc,
"%<-fipa-pta%> is incompatible with "
"%<-flive-patching=inline-only-static|inline-clone%>");
else
opts->x_flag_ipa_pta = 0;
if (opts_set->x_flag_ipa_reference && opts->x_flag_ipa_reference)
error_at (loc,
"%<-fipa-reference%> is incompatible with "
"%<-flive-patching=inline-only-static|inline-clone%>");
else
opts->x_flag_ipa_reference = 0;
if (opts_set->x_flag_ipa_ra && opts->x_flag_ipa_ra)
error_at (loc,
"%<-fipa-ra%> is incompatible with "
"%<-flive-patching=inline-only-static|inline-clone%>");
else
opts->x_flag_ipa_ra = 0;
if (opts_set->x_flag_ipa_icf && opts->x_flag_ipa_icf)
error_at (loc,
"%<-fipa-icf%> is incompatible with "
"%<-flive-patching=inline-only-static|inline-clone%>");
else
opts->x_flag_ipa_icf = 0;
if (opts_set->x_flag_ipa_icf_functions && opts->x_flag_ipa_icf_functions)
error_at (loc,
"%<-fipa-icf-functions%> is incompatible with "
"%<-flive-patching=inline-only-static|inline-clone%>");
else
opts->x_flag_ipa_icf_functions = 0;
if (opts_set->x_flag_ipa_icf_variables && opts->x_flag_ipa_icf_variables)
error_at (loc,
"%<-fipa-icf-variables%> is incompatible with "
"%<-flive-patching=inline-only-static|inline-clone%>");
else
opts->x_flag_ipa_icf_variables = 0;
if (opts_set->x_flag_ipa_bit_cp && opts->x_flag_ipa_bit_cp)
error_at (loc,
"%<-fipa-bit-cp%> is incompatible with "
"%<-flive-patching=inline-only-static|inline-clone%>");
else
opts->x_flag_ipa_bit_cp = 0;
if (opts_set->x_flag_ipa_vrp && opts->x_flag_ipa_vrp)
error_at (loc,
"%<-fipa-vrp%> is incompatible with "
"%<-flive-patching=inline-only-static|inline-clone%>");
else
opts->x_flag_ipa_vrp = 0;
if (opts_set->x_flag_ipa_pure_const && opts->x_flag_ipa_pure_const)
error_at (loc,
"%<-fipa-pure-const%> is incompatible with "
"%<-flive-patching=inline-only-static|inline-clone%>");
else
opts->x_flag_ipa_pure_const = 0;
/* FIXME: disable unreachable code removal. */
/* discovery of functions/variables with no address taken. */
if (opts_set->x_flag_ipa_reference_addressable
&& opts->x_flag_ipa_reference_addressable)
error_at (loc,
"%<-fipa-reference-addressable%> is incompatible with "
"%<-flive-patching=inline-only-static|inline-clone%>");
else
opts->x_flag_ipa_reference_addressable = 0;
/* ipa stack alignment propagation. */
if (opts_set->x_flag_ipa_stack_alignment
&& opts->x_flag_ipa_stack_alignment)
error_at (loc,
"%<-fipa-stack-alignment%> is incompatible with "
"%<-flive-patching=inline-only-static|inline-clone%>");
else
opts->x_flag_ipa_stack_alignment = 0;
break;
default:
gcc_unreachable ();
}
}
/* --help option argument if set. */
vec<const char *> help_option_arguments;
/* After all options at LOC have been read into OPTS and OPTS_SET,
finalize settings of those options and diagnose incompatible
combinations. */
void
finish_options (struct gcc_options *opts, struct gcc_options *opts_set,
location_t loc)
{
enum unwind_info_type ui_except;
if (opts->x_dump_base_name
&& ! opts->x_dump_base_name_prefixed)
{
const char *sep = opts->x_dump_base_name;
for (; *sep; sep++)
if (IS_DIR_SEPARATOR (*sep))
break;
if (*sep)
/* If dump_base_path contains subdirectories, don't prepend
anything. */;
else if (opts->x_dump_dir_name)
/* We have a DUMP_DIR_NAME, prepend that. */
opts->x_dump_base_name = opts_concat (opts->x_dump_dir_name,
opts->x_dump_base_name, NULL);
else if (opts->x_aux_base_name
&& strcmp (opts->x_aux_base_name, HOST_BIT_BUCKET) != 0)
/* AUX_BASE_NAME is set and is not the bit bucket. If it
contains a directory component, prepend those directories.
Typically this places things in the same directory as the
object file. */
{
const char *aux_base;
base_of_path (opts->x_aux_base_name, &aux_base);
if (opts->x_aux_base_name != aux_base)
{
int dir_len = aux_base - opts->x_aux_base_name;
char *new_dump_base_name
= XOBNEWVEC (&opts_obstack, char,
strlen (opts->x_dump_base_name) + dir_len + 1);
/* Copy directory component from OPTS->X_AUX_BASE_NAME. */
memcpy (new_dump_base_name, opts->x_aux_base_name, dir_len);
/* Append existing OPTS->X_DUMP_BASE_NAME. */
strcpy (new_dump_base_name + dir_len, opts->x_dump_base_name);
opts->x_dump_base_name = new_dump_base_name;
}
}
/* It is definitely prefixed now. */
opts->x_dump_base_name_prefixed = true;
}
/* Handle related options for unit-at-a-time, toplevel-reorder, and
section-anchors. */
if (!opts->x_flag_unit_at_a_time)
{
if (opts->x_flag_section_anchors && opts_set->x_flag_section_anchors)
error_at (loc, "section anchors must be disabled when unit-at-a-time "
"is disabled");
opts->x_flag_section_anchors = 0;
if (opts->x_flag_toplevel_reorder == 1)
error_at (loc, "toplevel reorder must be disabled when unit-at-a-time "
"is disabled");
opts->x_flag_toplevel_reorder = 0;
}
/* -fself-test depends on the state of the compiler prior to
compiling anything. Ideally it should be run on an empty source
file. However, in case we get run with actual source, assume
-fsyntax-only which will inhibit any compiler initialization
which may confuse the self tests. */
if (opts->x_flag_self_test)
opts->x_flag_syntax_only = 1;
if (opts->x_flag_tm && opts->x_flag_non_call_exceptions)
sorry ("transactional memory is not supported with non-call exceptions");
/* Unless the user has asked for section anchors, we disable toplevel
reordering at -O0 to disable transformations that might be surprising
to end users and to get -fno-toplevel-reorder tested. */
if (!opts->x_optimize
&& opts->x_flag_toplevel_reorder == 2
&& !(opts->x_flag_section_anchors && opts_set->x_flag_section_anchors))
{
opts->x_flag_toplevel_reorder = 0;
opts->x_flag_section_anchors = 0;
}
if (!opts->x_flag_toplevel_reorder)
{
if (opts->x_flag_section_anchors && opts_set->x_flag_section_anchors)
error_at (loc, "section anchors must be disabled when toplevel reorder"
" is disabled");
opts->x_flag_section_anchors = 0;
}
if (!opts->x_flag_opts_finished)
{
/* We initialize opts->x_flag_pie to -1 so that targets can set a
default value. */
if (opts->x_flag_pie == -1)
{
/* We initialize opts->x_flag_pic to -1 so that we can tell if
-fpic, -fPIC, -fno-pic or -fno-PIC is used. */
if (opts->x_flag_pic == -1)
opts->x_flag_pie = DEFAULT_FLAG_PIE;
else
opts->x_flag_pie = 0;
}
/* If -fPIE or -fpie is used, turn on PIC. */
if (opts->x_flag_pie)
opts->x_flag_pic = opts->x_flag_pie;
else if (opts->x_flag_pic == -1)
opts->x_flag_pic = 0;
if (opts->x_flag_pic && !opts->x_flag_pie)
opts->x_flag_shlib = 1;
opts->x_flag_opts_finished = true;
}
/* We initialize opts->x_flag_stack_protect to -1 so that targets
can set a default value. */
if (opts->x_flag_stack_protect == -1)
opts->x_flag_stack_protect = DEFAULT_FLAG_SSP;
if (opts->x_optimize == 0)
{
/* Inlining does not work if not optimizing,
so force it not to be done. */
opts->x_warn_inline = 0;
opts->x_flag_no_inline = 1;
}
/* The optimization to partition hot and cold basic blocks into separate
sections of the .o and executable files does not work (currently)
with exception handling. This is because there is no support for
generating unwind info. If opts->x_flag_exceptions is turned on
we need to turn off the partitioning optimization. */
ui_except = targetm_common.except_unwind_info (opts);
if (opts->x_flag_exceptions
&& opts->x_flag_reorder_blocks_and_partition
&& (ui_except == UI_SJLJ || ui_except >= UI_TARGET))
{
if (opts_set->x_flag_reorder_blocks_and_partition)
inform (loc,
"%<-freorder-blocks-and-partition%> does not work "
"with exceptions on this architecture");
opts->x_flag_reorder_blocks_and_partition = 0;
opts->x_flag_reorder_blocks = 1;
}
/* If user requested unwind info, then turn off the partitioning
optimization. */
if (opts->x_flag_unwind_tables
&& !targetm_common.unwind_tables_default
&& opts->x_flag_reorder_blocks_and_partition
&& (ui_except == UI_SJLJ || ui_except >= UI_TARGET))
{
if (opts_set->x_flag_reorder_blocks_and_partition)
inform (loc,
"%<-freorder-blocks-and-partition%> does not support "
"unwind info on this architecture");
opts->x_flag_reorder_blocks_and_partition = 0;
opts->x_flag_reorder_blocks = 1;
}
/* If the target requested unwind info, then turn off the partitioning
optimization with a different message. Likewise, if the target does not
support named sections. */
if (opts->x_flag_reorder_blocks_and_partition
&& (!targetm_common.have_named_sections
|| (opts->x_flag_unwind_tables
&& targetm_common.unwind_tables_default
&& (ui_except == UI_SJLJ || ui_except >= UI_TARGET))))