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From: Arthur Cohen <cohenarthur@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-4670] gccrs: Add compiler driver Date: Tue, 13 Dec 2022 13:20:10 +0000 (GMT) [thread overview] Message-ID: <20221213132010.9CAEF383D8EF@sourceware.org> (raw) https://gcc.gnu.org/g:bba14a0790f0858f76118bbb9b3a8231eb241138 commit r13-4670-gbba14a0790f0858f76118bbb9b3a8231eb241138 Author: Philip Herron <philip.herron@embecosm.com> Date: Tue Aug 23 16:41:31 2022 +0100 gccrs: Add compiler driver Our compiler driver is fairly simple so far. The key piece to enforce is that a compilation unit in Rust is the whole crate, so the process for compiling Rust means pointing the compiler at the main entry point such as src/lib.rs or src/main.rs where the expansion pass takes over loading the other source files to include them in the crate. gcc/rust/ * rustspec.cc: New. Diff: --- gcc/rust/rustspec.cc | 191 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 191 insertions(+) diff --git a/gcc/rust/rustspec.cc b/gcc/rust/rustspec.cc new file mode 100644 index 00000000000..b05f8ae5454 --- /dev/null +++ b/gcc/rust/rustspec.cc @@ -0,0 +1,191 @@ +/* rustspec.c -- Specific flags and argument handling of the gcc Rust front end. + Copyright (C) 2009-2022 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 "opts.h" + +// satisfy intellisense +#include "options.h" + +/* This bit is set if we saw a `-xfoo' language specification. */ +#define LANGSPEC (1 << 1) +/* This bit is set if they did `-lc'. */ +#define WITHLIBC (1 << 2) +/* Skip this option. */ +#define SKIPOPT (1 << 3) + +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; + + /* The new argument list will be contained in this. */ + struct cl_decoded_option *new_decoded_options; + + /* "-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 or WITHLIBC. */ + int *args; + + /* 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; + + /* The first input file with an extension of .rs. */ + const char *first_rust_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_l: + if (strcmp (arg, "c") == 0) + args[i] |= WITHLIBC; + 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_SPECIAL_input_file: + if (first_rust_file == NULL) + { + int len; + + len = strlen (arg); + if (len > 3 && strcmp (arg + len - 3, ".rs") == 0) + first_rust_file = arg; + } + else + { + // FIXME: ARTHUR: Do we want to error here? If there's already one + // file? + // How do we error here? Do we want to instead just handle that in + // the session manager? + } + + 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 + shared_libgcc * 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++]; + + /* NOTE: We start at 1 now, not 0. */ + while (i < argc) + { + new_decoded_options[j] = decoded_options[i]; + + if (!saw_libc && (args[i] & WITHLIBC)) + { + --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 .rs files to rust1. Without a -o option the + driver will invoke rust1 separately for each input file. FIXME: + This should probably use some other interface to force the driver + to set combine_inputs. */ + if (!saw_opt_o) + { + generate_option (OPT_o, "a.out", 1, CL_DRIVER, &new_decoded_options[j]); + 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++]); + + *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 Rust. */ +{ + return 0; +} + +/* Number of extra output files that lang_specific_pre_link may generate. */ +int lang_specific_extra_outfiles = 0; /* Not used for Rust. */
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