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/* LTO IL options.
Copyright (C) 2009-2017 Free Software Foundation, Inc.
Contributed by Simon Baldwin <simonb@google.com>
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 "coretypes.h"
#include "backend.h"
#include "target.h"
#include "tree.h"
#include "gimple.h"
#include "cgraph.h"
#include "lto-streamer.h"
#include "opts.h"
#include "toplev.h"
/* Append the option piece OPT to the COLLECT_GCC_OPTIONS string
set up by OB, appropriately quoted and separated by spaces
(if !*FIRST_P). */
static void
append_to_collect_gcc_options (struct obstack *ob,
bool *first_p, const char *opt)
{
const char *p, *q = opt;
if (!*first_p)
obstack_grow (ob, " ", 1);
obstack_grow (ob, "'", 1);
while ((p = strchr (q, '\'')))
{
obstack_grow (ob, q, p - q);
obstack_grow (ob, "'\\''", 4);
q = ++p;
}
obstack_grow (ob, q, strlen (q));
obstack_grow (ob, "'", 1);
*first_p = false;
}
/* Write currently held options to an LTO IL section. */
void
lto_write_options (void)
{
char *section_name;
struct obstack temporary_obstack;
unsigned int i, j;
char *args;
bool first_p = true;
section_name = lto_get_section_name (LTO_section_opts, NULL, NULL);
lto_begin_section (section_name, false);
obstack_init (&temporary_obstack);
/* Output options that affect GIMPLE IL semantics and are implicitly
enabled by the frontend.
This for now includes an explicit set of options that we also handle
explicitly in lto-wrapper.c. In the end the effects on GIMPLE IL
semantics should be explicitely encoded in the IL or saved per
function rather than per compilation unit. */
/* -fexceptions causes the EH machinery to be initialized, enabling
generation of unwind data so that explicit throw() calls work. */
if (!global_options_set.x_flag_exceptions
&& global_options.x_flag_exceptions)
append_to_collect_gcc_options (&temporary_obstack, &first_p,
"-fexceptions");
/* -fnon-call-exceptions changes the generation of exception
regions. It is enabled implicitly by the Go frontend. */
if (!global_options_set.x_flag_non_call_exceptions
&& global_options.x_flag_non_call_exceptions)
append_to_collect_gcc_options (&temporary_obstack, &first_p,
"-fnon-call-exceptions");
/* The default -ffp-contract changes depending on the language
standard. Pass thru conservative standard settings. */
if (!global_options_set.x_flag_fp_contract_mode)
switch (global_options.x_flag_fp_contract_mode)
{
case FP_CONTRACT_OFF:
append_to_collect_gcc_options (&temporary_obstack, &first_p,
"-ffp-contract=off");
break;
case FP_CONTRACT_ON:
append_to_collect_gcc_options (&temporary_obstack, &first_p,
"-ffp-contract=on");
break;
case FP_CONTRACT_FAST:
/* Nothing. That merges conservatively and is the default for LTO. */
break;
default:
gcc_unreachable ();
}
/* The default -fmath-errno, -fsigned-zeros and -ftrapping-math change
depending on the language (they can be disabled by the Ada and Java
front-ends). Pass thru conservative standard settings. */
if (!global_options_set.x_flag_errno_math)
append_to_collect_gcc_options (&temporary_obstack, &first_p,
global_options.x_flag_errno_math
? "-fmath-errno"
: "-fno-math-errno");
if (!global_options_set.x_flag_signed_zeros)
append_to_collect_gcc_options (&temporary_obstack, &first_p,
global_options.x_flag_signed_zeros
? "-fsigned-zeros"
: "-fno-signed-zeros");
if (!global_options_set.x_flag_trapping_math)
append_to_collect_gcc_options (&temporary_obstack, &first_p,
global_options.x_flag_trapping_math
? "-ftrapping-math"
: "-fno-trapping-math");
/* We need to merge -f[no-]strict-overflow, -f[no-]wrapv and -f[no-]trapv
conservatively, so stream out their defaults. */
if (!global_options_set.x_flag_wrapv
&& global_options.x_flag_wrapv)
append_to_collect_gcc_options (&temporary_obstack, &first_p, "-fwrapv");
if (!global_options_set.x_flag_trapv
&& !global_options.x_flag_trapv)
append_to_collect_gcc_options (&temporary_obstack, &first_p, "-fno-trapv");
if (!global_options_set.x_flag_strict_overflow
&& !global_options.x_flag_strict_overflow)
append_to_collect_gcc_options (&temporary_obstack, &first_p,
"-fno-strict-overflow");
if (!global_options_set.x_flag_openmp
&& !global_options.x_flag_openmp)
append_to_collect_gcc_options (&temporary_obstack, &first_p, "-fno-openmp");
if (!global_options_set.x_flag_openacc
&& !global_options.x_flag_openacc)
append_to_collect_gcc_options (&temporary_obstack, &first_p,
"-fno-openacc");
/* Append options from target hook and store them to offload_lto section. */
if (lto_stream_offload_p)
{
char *offload_opts = targetm.offload_options ();
char *offload_ptr = offload_opts;
while (offload_ptr)
{
char *next = strchr (offload_ptr, ' ');
if (next)
*next++ = '\0';
append_to_collect_gcc_options (&temporary_obstack, &first_p,
offload_ptr);
offload_ptr = next;
}
free (offload_opts);
}
/* Output explicitly passed options. */
for (i = 1; i < save_decoded_options_count; ++i)
{
struct cl_decoded_option *option = &save_decoded_options[i];
/* Skip explicitly some common options that we do not need. */
switch (option->opt_index)
{
case OPT_dumpbase:
case OPT_SPECIAL_unknown:
case OPT_SPECIAL_ignore:
case OPT_SPECIAL_program_name:
case OPT_SPECIAL_input_file:
continue;
default:
break;
}
/* Skip frontend and driver specific options here. */
if (!(cl_options[option->opt_index].flags & (CL_COMMON|CL_TARGET|CL_LTO)))
continue;
/* Do not store target-specific options in offload_lto section. */
if ((cl_options[option->opt_index].flags & CL_TARGET)
&& lto_stream_offload_p)
continue;
/* Drop options created from the gcc driver that will be rejected
when passed on to the driver again. */
if (cl_options[option->opt_index].cl_reject_driver)
continue;
/* Also drop all options that are handled by the driver as well,
which includes things like -o and -v or -fhelp for example.
We do not need those. The only exception is -foffload option, if we
write it in offload_lto section. Also drop all diagnostic options. */
if ((cl_options[option->opt_index].flags & (CL_DRIVER|CL_WARNING))
&& (!lto_stream_offload_p || option->opt_index != OPT_foffload_))
continue;
for (j = 0; j < option->canonical_option_num_elements; ++j)
append_to_collect_gcc_options (&temporary_obstack, &first_p,
option->canonical_option[j]);
}
obstack_grow (&temporary_obstack, "\0", 1);
args = XOBFINISH (&temporary_obstack, char *);
lto_write_data (args, strlen (args) + 1);
lto_end_section ();
obstack_free (&temporary_obstack, NULL);
free (section_name);
}
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