diff options
Diffstat (limited to 'gcc-4.9/gcc/go/gospec.c')
| -rw-r--r-- | gcc-4.9/gcc/go/gospec.c | 410 |
1 files changed, 410 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/go/gospec.c b/gcc-4.9/gcc/go/gospec.c new file mode 100644 index 000000000..02d584235 --- /dev/null +++ b/gcc-4.9/gcc/go/gospec.c @@ -0,0 +1,410 @@ +/* gospec.c -- Specific flags and argument handling of the gcc Go front end. + Copyright (C) 2009-2014 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 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 "tm.h" +#include "gcc.h" +#include "opts.h" + +/* This bit is set if we saw a `-xfoo' language specification. */ +#define LANGSPEC (1<<1) +/* This bit is set if they did `-lm' or `-lmath'. */ +#define MATHLIB (1<<2) +/* This bit is set if they did `-lpthread'. */ +#define THREADLIB (1<<3) +/* This bit is set if they did `-lc'. */ +#define WITHLIBC (1<<4) +/* Skip this option. */ +#define SKIPOPT (1<<5) + +#ifndef MATH_LIBRARY +#define MATH_LIBRARY "m" +#endif +#ifndef MATH_LIBRARY_PROFILE +#define MATH_LIBRARY_PROFILE MATH_LIBRARY +#endif + +#define THREAD_LIBRARY "pthread" +#define THREAD_LIBRARY_PROFILE THREAD_LIBRARY + +#define LIBGO "go" +#define LIBGO_PROFILE LIBGO +#define LIBGOBEGIN "gobegin" + +void +lang_specific_driver (struct cl_decoded_option **in_decoded_options, + unsigned int *in_decoded_options_count, + int *in_added_libraries) +{ + unsigned int i, j; + + /* If true, the user gave us the `-p' or `-pg' flag. */ + bool saw_profile_flag = false; + + /* This is a tristate: + -1 means we should not link in libgo + 0 means we should link in libgo if it is needed + 1 means libgo is needed and should be linked in. + 2 means libgo is needed and should be linked statically. */ + int library = 0; + + /* The new argument list will be contained in this. */ + struct cl_decoded_option *new_decoded_options; + + /* "-lm" or "-lmath" if it appears on the command line. */ + const struct cl_decoded_option *saw_math = 0; + + /* "-lpthread" if it appears on the command line. */ + const struct cl_decoded_option *saw_thread = 0; + + /* "-lc" if it appears on the command line. */ + const struct cl_decoded_option *saw_libc = 0; + + /* An array used to flag each argument that needs a bit set for + LANGSPEC, MATHLIB, or WITHLIBC. */ + int *args; + + /* Whether we need the thread library. */ + int need_thread = 0; + + /* By default, we throw on the math library if we have one. */ + int need_math = (MATH_LIBRARY[0] != '\0'); + + /* True if we saw -static. */ + int static_link = 0; + + /* True if we should add -shared-libgcc to the command-line. */ + int shared_libgcc = 1; + + /* The total number of arguments with the new stuff. */ + unsigned int argc; + + /* The argument list. */ + struct cl_decoded_option *decoded_options; + + /* The number of libraries added in. */ + int added_libraries; + + /* The total number of arguments with the new stuff. */ + int num_args = 1; + + /* Whether the -o option was used. */ + bool saw_opt_o = false; + + /* Whether the -c option was used. Also used for -E, -fsyntax-only, + in general anything which implies only compilation and not + linking. */ + bool saw_opt_c = false; + + /* Whether the -S option was used. */ + bool saw_opt_S = false; + + /* The first input file with an extension of .go. */ + const char *first_go_file = NULL; + + argc = *in_decoded_options_count; + decoded_options = *in_decoded_options; + added_libraries = *in_added_libraries; + + args = XCNEWVEC (int, argc); + + for (i = 1; i < argc; i++) + { + const char *arg = decoded_options[i].arg; + + switch (decoded_options[i].opt_index) + { + case OPT_nostdlib: + case OPT_nodefaultlibs: + library = -1; + break; + + case OPT_l: + if (strcmp (arg, MATH_LIBRARY) == 0) + { + args[i] |= MATHLIB; + need_math = 0; + } + else if (strcmp (arg, THREAD_LIBRARY) == 0) + args[i] |= THREADLIB; + else if (strcmp (arg, "c") == 0) + args[i] |= WITHLIBC; + else + /* Unrecognized libraries (e.g. -lfoo) may require libgo. */ + library = (library == 0) ? 1 : library; + break; + + case OPT_pg: + case OPT_p: + saw_profile_flag = true; + break; + + case OPT_x: + if (library == 0 && strcmp (arg, "go") == 0) + library = 1; + break; + + case OPT_Xlinker: + case OPT_Wl_: + /* Arguments that go directly to the linker might be .o files, + or something, and so might cause libgo to be needed. */ + if (library == 0) + library = 1; + break; + + case OPT_c: + case OPT_E: + case OPT_M: + case OPT_MM: + case OPT_fsyntax_only: + /* Don't specify libraries if we won't link, since that would + cause a warning. */ + saw_opt_c = true; + library = -1; + break; + + case OPT_S: + saw_opt_S = true; + library = -1; + break; + + case OPT_o: + saw_opt_o = true; + break; + + case OPT_static: + static_link = 1; + break; + + case OPT_static_libgcc: + shared_libgcc = 0; + break; + + case OPT_static_libgo: + library = library >= 0 ? 2 : library; + args[i] |= SKIPOPT; + break; + + case OPT_SPECIAL_input_file: + if (library == 0) + library = 1; + + if (first_go_file == NULL) + { + int len; + + len = strlen (arg); + if (len > 3 && strcmp (arg + len - 3, ".go") == 0) + first_go_file = arg; + } + + break; + } + } + + /* There's no point adding -shared-libgcc if we don't have a shared + libgcc. */ +#ifndef ENABLE_SHARED_LIBGCC + shared_libgcc = 0; +#endif + + /* Make sure to have room for the trailing NULL argument. */ + num_args = argc + need_math + shared_libgcc + (library > 0) * 5 + 10; + new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args); + + i = 0; + j = 0; + + /* Copy the 0th argument, i.e., the name of the program itself. */ + new_decoded_options[j++] = decoded_options[i++]; + + /* If we are linking, pass -fsplit-stack if it is supported. */ +#ifdef TARGET_CAN_SPLIT_STACK + if (library >= 0) + { + generate_option (OPT_fsplit_stack, NULL, 1, CL_DRIVER, + &new_decoded_options[j]); + j++; + } +#endif + + /* NOTE: We start at 1 now, not 0. */ + while (i < argc) + { + new_decoded_options[j] = decoded_options[i]; + + /* Make sure -lgo is before the math library, since libgo itself + uses those math routines. */ + if (!saw_math && (args[i] & MATHLIB) && library > 0) + { + --j; + saw_math = &decoded_options[i]; + } + + if (!saw_thread && (args[i] & THREADLIB) && library > 0) + { + --j; + saw_thread = &decoded_options[i]; + } + + if (!saw_libc && (args[i] & WITHLIBC) && library > 0) + { + --j; + saw_libc = &decoded_options[i]; + } + + if ((args[i] & SKIPOPT) != 0) + --j; + + i++; + j++; + } + + /* If we didn't see a -o option, add one. This is because we need + the driver to pass all .go files to go1. Without a -o option the + driver will invoke go1 separately for each input file. FIXME: + This should probably use some other interface to force the driver + to set combine_inputs. */ + if (first_go_file != NULL && !saw_opt_o) + { + if (saw_opt_c || saw_opt_S) + { + const char *base; + int baselen; + int alen; + char *out; + + base = lbasename (first_go_file); + baselen = strlen (base) - 3; + alen = baselen + 3; + out = XNEWVEC (char, alen); + memcpy (out, base, baselen); + /* The driver will convert .o to some other suffix (e.g., + .obj) if appropriate. */ + out[baselen] = '.'; + if (saw_opt_S) + out[baselen + 1] = 's'; + else + out[baselen + 1] = 'o'; + out[baselen + 2] = '\0'; + generate_option (OPT_o, out, 1, CL_DRIVER, + &new_decoded_options[j]); + } + else + generate_option (OPT_o, "a.out", 1, CL_DRIVER, + &new_decoded_options[j]); + j++; + } + + /* Add `-lgo' if we haven't already done so. */ + if (library > 0) + { + generate_option (OPT_l, LIBGOBEGIN, 1, CL_DRIVER, + &new_decoded_options[j]); + added_libraries++; + j++; + +#ifdef HAVE_LD_STATIC_DYNAMIC + if (library > 1 && !static_link) + { + generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER, + &new_decoded_options[j]); + j++; + } +#endif + + generate_option (OPT_l, saw_profile_flag ? LIBGO_PROFILE : LIBGO, 1, + CL_DRIVER, &new_decoded_options[j]); + added_libraries++; + j++; + +#ifdef HAVE_LD_STATIC_DYNAMIC + if (library > 1 && !static_link) + { + generate_option (OPT_Wl_, LD_DYNAMIC_OPTION, 1, CL_DRIVER, + &new_decoded_options[j]); + j++; + } +#endif + + /* When linking libgo statically we also need to link with the + pthread library. */ + if (library > 1 || static_link) + need_thread = 1; + } + + if (saw_thread) + new_decoded_options[j++] = *saw_thread; + else if (library > 0 && need_thread) + { + generate_option (OPT_l, + (saw_profile_flag + ? THREAD_LIBRARY_PROFILE + : THREAD_LIBRARY), + 1, CL_DRIVER, &new_decoded_options[j]); + added_libraries++; + j++; + } + + if (saw_math) + new_decoded_options[j++] = *saw_math; + else if (library > 0 && need_math) + { + generate_option (OPT_l, + saw_profile_flag ? MATH_LIBRARY_PROFILE : MATH_LIBRARY, + 1, CL_DRIVER, &new_decoded_options[j]); + added_libraries++; + j++; + } + + if (saw_libc) + new_decoded_options[j++] = *saw_libc; + if (shared_libgcc && !static_link) + generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER, + &new_decoded_options[j++]); + +#ifdef TARGET_CAN_SPLIT_STACK + /* libgcc wraps pthread_create to support split stack, however, due to + relative ordering of -lpthread and -lgcc, we can't just mark + __real_pthread_create in libgcc as non-weak. But we need to link in + pthread_create from pthread if we are statically linking, so we work- + around by passing -u pthread_create to to the linker. */ + if (static_link) + { + generate_option (OPT_Wl_, "-u,pthread_create", 1, CL_DRIVER, + &new_decoded_options[j]); + j++; + } +#endif + + *in_decoded_options_count = j; + *in_decoded_options = new_decoded_options; + *in_added_libraries = added_libraries; +} + +/* Called before linking. Returns 0 on success and -1 on failure. */ +int lang_specific_pre_link (void) /* Not used for Go. */ +{ + return 0; +} + +/* Number of extra output files that lang_specific_pre_link may generate. */ +int lang_specific_extra_outfiles = 0; /* Not used for Go. */ |