/* LTO IL options. Copyright (C) 2009-2015 Free Software Foundation, Inc. Contributed by Simon Baldwin 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 . */ #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); }