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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.
This commit is contained in:
Philip Herron
committed by
Arthur Cohen
Arthur Cohen
parent
fe6264fa28
commit
bba14a0790
191
gcc/rust/rustspec.cc
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191
gcc/rust/rustspec.cc
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/* rustspec.c -- Specific flags and argument handling of the gcc Rust front end.
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Copyright (C) 2009-2022 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "opts.h"
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// satisfy intellisense
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#include "options.h"
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/* This bit is set if we saw a `-xfoo' language specification. */
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#define LANGSPEC (1 << 1)
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/* This bit is set if they did `-lc'. */
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#define WITHLIBC (1 << 2)
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/* Skip this option. */
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#define SKIPOPT (1 << 3)
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void
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lang_specific_driver (struct cl_decoded_option **in_decoded_options,
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unsigned int *in_decoded_options_count,
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int *in_added_libraries)
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{
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unsigned int i, j;
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/* The new argument list will be contained in this. */
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struct cl_decoded_option *new_decoded_options;
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/* "-lc" if it appears on the command line. */
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const struct cl_decoded_option *saw_libc = 0;
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/* An array used to flag each argument that needs a bit set for
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LANGSPEC or WITHLIBC. */
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int *args;
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/* True if we saw -static. */
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int static_link = 0;
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/* True if we should add -shared-libgcc to the command-line. */
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int shared_libgcc = 1;
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/* The total number of arguments with the new stuff. */
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unsigned int argc;
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/* The argument list. */
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struct cl_decoded_option *decoded_options;
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/* The number of libraries added in. */
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int added_libraries;
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/* The total number of arguments with the new stuff. */
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int num_args = 1;
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/* Whether the -o option was used. */
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bool saw_opt_o = false;
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/* The first input file with an extension of .rs. */
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const char *first_rust_file = NULL;
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argc = *in_decoded_options_count;
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decoded_options = *in_decoded_options;
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added_libraries = *in_added_libraries;
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args = XCNEWVEC (int, argc);
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for (i = 1; i < argc; i++)
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{
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const char *arg = decoded_options[i].arg;
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switch (decoded_options[i].opt_index)
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{
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case OPT_l:
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if (strcmp (arg, "c") == 0)
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args[i] |= WITHLIBC;
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break;
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case OPT_o:
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saw_opt_o = true;
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break;
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case OPT_static:
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static_link = 1;
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break;
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case OPT_static_libgcc:
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shared_libgcc = 0;
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break;
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case OPT_SPECIAL_input_file:
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if (first_rust_file == NULL)
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{
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int len;
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len = strlen (arg);
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if (len > 3 && strcmp (arg + len - 3, ".rs") == 0)
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first_rust_file = arg;
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}
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else
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{
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// FIXME: ARTHUR: Do we want to error here? If there's already one
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// file?
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// How do we error here? Do we want to instead just handle that in
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// the session manager?
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}
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break;
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}
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}
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/* There's no point adding -shared-libgcc if we don't have a shared
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libgcc. */
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#ifndef ENABLE_SHARED_LIBGCC
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shared_libgcc = 0;
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#endif
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/* Make sure to have room for the trailing NULL argument. */
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num_args = argc + shared_libgcc * 5 + 10;
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new_decoded_options = XNEWVEC (struct cl_decoded_option, num_args);
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i = 0;
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j = 0;
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/* Copy the 0th argument, i.e., the name of the program itself. */
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new_decoded_options[j++] = decoded_options[i++];
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/* NOTE: We start at 1 now, not 0. */
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while (i < argc)
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{
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new_decoded_options[j] = decoded_options[i];
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if (!saw_libc && (args[i] & WITHLIBC))
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{
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--j;
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saw_libc = &decoded_options[i];
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}
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if ((args[i] & SKIPOPT) != 0)
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--j;
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i++;
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j++;
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}
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/* If we didn't see a -o option, add one. This is because we need
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the driver to pass all .rs files to rust1. Without a -o option the
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driver will invoke rust1 separately for each input file. FIXME:
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This should probably use some other interface to force the driver
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to set combine_inputs. */
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if (!saw_opt_o)
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{
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generate_option (OPT_o, "a.out", 1, CL_DRIVER, &new_decoded_options[j]);
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j++;
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}
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if (saw_libc)
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new_decoded_options[j++] = *saw_libc;
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if (shared_libgcc && !static_link)
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generate_option (OPT_shared_libgcc, NULL, 1, CL_DRIVER,
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&new_decoded_options[j++]);
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*in_decoded_options_count = j;
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*in_decoded_options = new_decoded_options;
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*in_added_libraries = added_libraries;
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}
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/* Called before linking. Returns 0 on success and -1 on failure. */
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int
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lang_specific_pre_link (void) /* Not used for Rust. */
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{
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return 0;
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}
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/* Number of extra output files that lang_specific_pre_link may generate. */
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int lang_specific_extra_outfiles = 0; /* Not used for Rust. */
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