393 lines
9.5 KiB
C++
393 lines
9.5 KiB
C++
/* The library used by gdb.
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Copyright (C) 2014-2021 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 <cc1plugin-config.h>
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#include <vector>
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#include <string>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <stdlib.h>
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#include "marshall.hh"
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#include "rpc.hh"
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#include "connection.hh"
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#include "names.hh"
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#include "callbacks.hh"
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#include "libiberty.h"
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#include "compiler-name.hh"
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#include "gcc-c-interface.h"
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#include "compiler.hh"
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#include "gdbctx.hh"
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// The C compiler context that we hand back to our caller.
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struct libcc1 : public cc1_plugin::base_gdb_plugin<gcc_c_context>
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{
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libcc1 (const gcc_base_vtable *, const gcc_c_fe_vtable *);
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gcc_c_oracle_function *binding_oracle = nullptr;
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gcc_c_symbol_address_function *address_oracle = nullptr;
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void *oracle_datum = nullptr;
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};
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libcc1::libcc1 (const gcc_base_vtable *v, const gcc_c_fe_vtable *cv)
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: cc1_plugin::base_gdb_plugin<gcc_c_context> (v)
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{
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c_ops = cv;
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}
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// Enclose these functions in an anonymous namespace because they
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// shouldn't be exported, but they can't be static because they're
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// used as template arguments.
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namespace {
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// This is a wrapper function that is called by the RPC system and
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// that then forwards the call to the library user. Note that the
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// return value is not used; the type cannot be 'void' due to
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// limitations in our simple RPC.
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int
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c_call_binding_oracle (cc1_plugin::connection *conn,
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enum gcc_c_oracle_request request,
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const char *identifier)
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{
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libcc1 *self = (libcc1 *) (((libcc1::local_connection *) conn)->back_ptr);
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self->binding_oracle (self->oracle_datum, self, request, identifier);
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return 1;
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}
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// This is a wrapper function that is called by the RPC system and
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// that then forwards the call to the library user.
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gcc_address
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c_call_symbol_address (cc1_plugin::connection *conn, const char *identifier)
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{
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libcc1 *self = (libcc1 *) (((libcc1::local_connection *) conn)->back_ptr);
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return self->address_oracle (self->oracle_datum, self, identifier);
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}
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} /* anonymous namespace */
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static void
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set_callbacks (struct gcc_c_context *s,
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gcc_c_oracle_function *binding_oracle,
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gcc_c_symbol_address_function *address_oracle,
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void *datum)
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{
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libcc1 *self = (libcc1 *) s;
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self->binding_oracle = binding_oracle;
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self->address_oracle = address_oracle;
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self->oracle_datum = datum;
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}
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static const struct gcc_c_fe_vtable c_vtable =
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{
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GCC_C_FE_VERSION_0,
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set_callbacks,
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#define GCC_METHOD0(R, N) \
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cc1_plugin::rpc<gcc_c_context, R, cc1_plugin::c::N>,
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#define GCC_METHOD1(R, N, A) \
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cc1_plugin::rpc<gcc_c_context, R, cc1_plugin::c::N, A>,
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#define GCC_METHOD2(R, N, A, B) \
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cc1_plugin::rpc<gcc_c_context, R, cc1_plugin::c::N, A, B>,
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#define GCC_METHOD3(R, N, A, B, C) \
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cc1_plugin::rpc<gcc_c_context, R, cc1_plugin::c::N, A, B, C>,
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#define GCC_METHOD4(R, N, A, B, C, D) \
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cc1_plugin::rpc<gcc_c_context, R, cc1_plugin::c::N, A, B, C, D>,
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#define GCC_METHOD5(R, N, A, B, C, D, E) \
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cc1_plugin::rpc<gcc_c_context, R, cc1_plugin::c::N, A, B, C, D, E>,
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#define GCC_METHOD7(R, N, A, B, C, D, E, F, G) \
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cc1_plugin::rpc<gcc_c_context, R, cc1_plugin::c::N, A, B, C, D, E, F, G>,
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#include "gcc-c-fe.def"
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#undef GCC_METHOD0
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#undef GCC_METHOD1
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#undef GCC_METHOD2
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#undef GCC_METHOD3
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#undef GCC_METHOD4
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#undef GCC_METHOD5
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#undef GCC_METHOD7
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};
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static void
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libcc1_set_verbose (struct gcc_base_context *s, int /* bool */ verbose)
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{
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libcc1 *self = (libcc1 *) s;
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self->set_verbose (verbose != 0);
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}
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static char *
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libcc1_set_arguments (struct gcc_base_context *s,
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int argc, char **argv)
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{
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libcc1 *self = (libcc1 *) s;
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std::string compiler;
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char *errmsg = self->compilerp->find (C_COMPILER_NAME, compiler);
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if (errmsg != NULL)
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return errmsg;
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self->args.push_back (compiler);
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for (int i = 0; i < argc; ++i)
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self->args.push_back (argv[i]);
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return NULL;
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}
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static char *
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libcc1_set_triplet_regexp (struct gcc_base_context *s,
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const char *triplet_regexp)
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{
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libcc1 *self = (libcc1 *) s;
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self->compilerp.reset
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(new cc1_plugin::compiler_triplet_regexp (self->verbose,
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triplet_regexp));
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return NULL;
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}
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static char *
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libcc1_set_driver_filename (struct gcc_base_context *s,
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const char *driver_filename)
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{
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libcc1 *self = (libcc1 *) s;
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self->compilerp.reset
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(new cc1_plugin::compiler_driver_filename (self->verbose,
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driver_filename));
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return NULL;
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}
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static char *
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libcc1_set_arguments_v0 (struct gcc_base_context *s,
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const char *triplet_regexp,
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int argc, char **argv)
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{
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char *errmsg = libcc1_set_triplet_regexp (s, triplet_regexp);
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if (errmsg != NULL)
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return errmsg;
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return libcc1_set_arguments (s, argc, argv);
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}
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static void
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libcc1_set_source_file (struct gcc_base_context *s,
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const char *file)
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{
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libcc1 *self = (libcc1 *) s;
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self->source_file = file;
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}
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static void
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libcc1_set_print_callback (struct gcc_base_context *s,
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void (*print_function) (void *datum,
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const char *message),
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void *datum)
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{
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libcc1 *self = (libcc1 *) s;
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self->print_function = print_function;
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self->print_datum = datum;
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}
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static int
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fork_exec (libcc1 *self, char **argv, int spair_fds[2], int stderr_fds[2])
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{
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pid_t child_pid = fork ();
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if (child_pid == -1)
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{
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close (spair_fds[0]);
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close (spair_fds[1]);
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close (stderr_fds[0]);
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close (stderr_fds[1]);
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return 0;
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}
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if (child_pid == 0)
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{
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// Child.
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dup2 (stderr_fds[1], 1);
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dup2 (stderr_fds[1], 2);
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close (stderr_fds[0]);
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close (stderr_fds[1]);
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close (spair_fds[0]);
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execvp (argv[0], argv);
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_exit (127);
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}
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else
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{
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// Parent.
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close (spair_fds[1]);
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close (stderr_fds[1]);
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cc1_plugin::status result = cc1_plugin::FAIL;
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if (self->connection->send ('H')
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&& ::cc1_plugin::marshall (self->connection.get (),
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GCC_C_FE_VERSION_1))
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result = self->connection->wait_for_query ();
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close (spair_fds[0]);
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close (stderr_fds[0]);
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while (true)
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{
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int status;
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if (waitpid (child_pid, &status, 0) == -1)
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{
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if (errno != EINTR)
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return 0;
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}
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if (!WIFEXITED (status) || WEXITSTATUS (status) != 0)
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return 0;
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break;
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}
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if (!result)
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return 0;
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return 1;
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}
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}
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static int
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libcc1_compile (struct gcc_base_context *s,
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const char *filename)
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{
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libcc1 *self = (libcc1 *) s;
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int fds[2];
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if (socketpair (AF_UNIX, SOCK_STREAM, 0, fds) != 0)
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{
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self->print ("could not create socketpair\n");
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return 0;
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}
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int stderr_fds[2];
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if (pipe (stderr_fds) != 0)
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{
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self->print ("could not create pipe\n");
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close (fds[0]);
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close (fds[1]);
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return 0;
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}
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self->args.push_back ("-fplugin=libcc1plugin");
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char buf[100];
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if (snprintf (buf, sizeof (buf), "-fplugin-arg-libcc1plugin-fd=%d", fds[1])
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>= (long) sizeof (buf))
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abort ();
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self->args.push_back (buf);
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self->args.push_back (self->source_file);
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self->args.push_back ("-c");
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self->args.push_back ("-o");
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self->args.push_back (filename);
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if (self->verbose)
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self->args.push_back ("-v");
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self->set_connection (fds[0], stderr_fds[0]);
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cc1_plugin::callback_ftype *fun
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= cc1_plugin::callback<int,
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enum gcc_c_oracle_request,
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const char *,
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c_call_binding_oracle>;
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self->connection->add_callback ("binding_oracle", fun);
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fun = cc1_plugin::callback<gcc_address,
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const char *,
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c_call_symbol_address>;
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self->connection->add_callback ("address_oracle", fun);
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char **argv = new (std::nothrow) char *[self->args.size () + 1];
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if (argv == NULL)
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return 0;
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for (unsigned int i = 0; i < self->args.size (); ++i)
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argv[i] = const_cast<char *> (self->args[i].c_str ());
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argv[self->args.size ()] = NULL;
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return fork_exec (self, argv, fds, stderr_fds);
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}
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static int
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libcc1_compile_v0 (struct gcc_base_context *s, const char *filename,
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int verbose)
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{
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libcc1_set_verbose (s, verbose);
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return libcc1_compile (s, filename);
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}
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static void
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libcc1_destroy (struct gcc_base_context *s)
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{
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libcc1 *self = (libcc1 *) s;
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delete self;
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}
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static const struct gcc_base_vtable vtable =
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{
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GCC_FE_VERSION_1,
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libcc1_set_arguments_v0,
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libcc1_set_source_file,
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libcc1_set_print_callback,
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libcc1_compile_v0,
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libcc1_destroy,
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libcc1_set_verbose,
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libcc1_compile,
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libcc1_set_arguments,
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libcc1_set_triplet_regexp,
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libcc1_set_driver_filename,
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};
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extern "C" gcc_c_fe_context_function gcc_c_fe_context;
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#ifdef __GNUC__
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#pragma GCC visibility push(default)
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#endif
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extern "C"
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struct gcc_c_context *
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gcc_c_fe_context (enum gcc_base_api_version base_version,
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enum gcc_c_api_version c_version)
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{
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if ((base_version != GCC_FE_VERSION_0 && base_version != GCC_FE_VERSION_1)
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|| (c_version != GCC_C_FE_VERSION_0 && c_version != GCC_C_FE_VERSION_1))
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return NULL;
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return new libcc1 (&vtable, &c_vtable);
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}
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