493 lines
12 KiB
C++
493 lines
12 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-cp.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 "compiler.hh"
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struct libcp1;
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class libcp1_connection;
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// The C compiler context that we hand back to our caller.
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struct libcp1 : public gcc_cp_context
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{
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libcp1 (const gcc_base_vtable *, const gcc_cp_fe_vtable *);
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// A convenience function to print something.
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void print (const char *str)
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{
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this->print_function (this->print_datum, str);
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}
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std::unique_ptr<libcp1_connection> connection;
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gcc_cp_oracle_function *binding_oracle;
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gcc_cp_symbol_address_function *address_oracle;
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gcc_cp_enter_leave_user_expr_scope_function *enter_scope;
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gcc_cp_enter_leave_user_expr_scope_function *leave_scope;
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void *oracle_datum;
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void (*print_function) (void *datum, const char *message);
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void *print_datum;
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std::vector<std::string> args;
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std::string source_file;
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/* Non-zero as an equivalent to gcc driver option "-v". */
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bool verbose;
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std::unique_ptr<cc1_plugin::compiler> compilerp;
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};
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// A local subclass of connection that holds a back-pointer to the
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// gcc_c_context object that we provide to our caller.
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class libcp1_connection : public cc1_plugin::connection
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{
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public:
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libcp1_connection (int fd, int aux_fd, libcp1 *b)
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: connection (fd, aux_fd),
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back_ptr (b)
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{
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}
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void print (const char *buf) override
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{
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back_ptr->print (buf);
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}
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libcp1 *back_ptr;
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};
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libcp1::libcp1 (const gcc_base_vtable *v,
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const gcc_cp_fe_vtable *cv)
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: binding_oracle (NULL),
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address_oracle (NULL),
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oracle_datum (NULL),
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print_function (NULL),
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print_datum (NULL),
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args (),
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source_file (),
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verbose (false),
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compilerp (new cc1_plugin::compiler (verbose))
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{
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base.ops = v;
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cp_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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cp_call_binding_oracle (cc1_plugin::connection *conn,
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enum gcc_cp_oracle_request request,
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const char *identifier)
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{
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libcp1 *self = ((libcp1_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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cp_call_symbol_address (cc1_plugin::connection *conn, const char *identifier)
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{
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libcp1 *self = ((libcp1_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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int
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cp_call_enter_scope (cc1_plugin::connection *conn)
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{
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libcp1 *self = ((libcp1_connection *) conn)->back_ptr;
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self->enter_scope (self->oracle_datum, self);
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return 1;
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}
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int
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cp_call_leave_scope (cc1_plugin::connection *conn)
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{
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libcp1 *self = ((libcp1_connection *) conn)->back_ptr;
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self->leave_scope (self->oracle_datum, self);
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return 1;
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}
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} /* anonymous namespace */
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static void
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set_callbacks (struct gcc_cp_context *s,
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gcc_cp_oracle_function *binding_oracle,
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gcc_cp_symbol_address_function *address_oracle,
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gcc_cp_enter_leave_user_expr_scope_function *enter_scope,
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gcc_cp_enter_leave_user_expr_scope_function *leave_scope,
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void *datum)
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{
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libcp1 *self = (libcp1 *) s;
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self->binding_oracle = binding_oracle;
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self->address_oracle = address_oracle;
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self->enter_scope = enter_scope;
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self->leave_scope = leave_scope;
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self->oracle_datum = datum;
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}
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// Instances of this rpc<> template function are installed into the
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// "cp_vtable". These functions are parameterized by type and method
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// name and forward the call via the connection.
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template<typename R, const char *&NAME, typename... Arg>
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R rpc (struct gcc_cp_context *s, Arg... rest)
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{
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libcp1 *self = (libcp1 *) s;
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R result;
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if (!cc1_plugin::call (self->connection.get (), NAME, &result, rest...))
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return 0;
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return result;
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}
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static const struct gcc_cp_fe_vtable cp_vtable =
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{
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GCC_CP_FE_VERSION_0,
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set_callbacks,
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#define GCC_METHOD0(R, N) \
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rpc<R, cc1_plugin::cp::N>,
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#define GCC_METHOD1(R, N, A) \
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rpc<R, cc1_plugin::cp::N, A>,
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#define GCC_METHOD2(R, N, A, B) \
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rpc<R, cc1_plugin::cp::N, A, B>,
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#define GCC_METHOD3(R, N, A, B, C) \
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rpc<R, cc1_plugin::cp::N, A, B, C>,
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#define GCC_METHOD4(R, N, A, B, C, D) \
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rpc<R, cc1_plugin::cp::N, A, B, C, D>,
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#define GCC_METHOD5(R, N, A, B, C, D, E) \
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rpc<R, cc1_plugin::cp::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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rpc<R, cc1_plugin::cp::N, A, B, C, D, E, F, G>,
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#include "gcc-cp-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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libcp1_set_verbose (struct gcc_base_context *s, int /* bool */ verbose)
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{
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libcp1 *self = (libcp1 *) s;
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self->verbose = verbose != 0;
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if (self->compilerp != nullptr)
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self->compilerp->set_verbose (self->verbose);
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}
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static char *
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libcp1_set_arguments (struct gcc_base_context *s,
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int argc, char **argv)
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{
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libcp1 *self = (libcp1 *) s;
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std::string compiler;
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char *errmsg = self->compilerp->find (CP_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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libcp1_set_triplet_regexp (struct gcc_base_context *s,
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const char *triplet_regexp)
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{
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libcp1 *self = (libcp1 *) 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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libcp1_set_driver_filename (struct gcc_base_context *s,
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const char *driver_filename)
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{
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libcp1 *self = (libcp1 *) 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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libcp1_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 = libcp1_set_triplet_regexp (s, triplet_regexp);
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if (errmsg != NULL)
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return errmsg;
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return libcp1_set_arguments (s, argc, argv);
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}
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static void
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libcp1_set_source_file (struct gcc_base_context *s,
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const char *file)
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{
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libcp1 *self = (libcp1 *) s;
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self->source_file = file;
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}
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static void
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libcp1_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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libcp1 *self = (libcp1 *) 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 (libcp1 *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_CP_FE_VERSION_0))
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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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libcp1_compile (struct gcc_base_context *s,
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const char *filename)
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{
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libcp1 *self = (libcp1 *) 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=libcp1plugin");
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char buf[100];
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if (snprintf (buf, sizeof (buf), "-fplugin-arg-libcp1plugin-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->connection.reset (new libcp1_connection (fds[0], stderr_fds[0], self));
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cc1_plugin::callback_ftype *fun
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= cc1_plugin::callback<int,
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enum gcc_cp_oracle_request,
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const char *,
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cp_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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cp_call_symbol_address>;
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self->connection->add_callback ("address_oracle", fun);
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fun = cc1_plugin::callback<int,
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cp_call_enter_scope>;
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self->connection->add_callback ("enter_scope", fun);
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fun = cc1_plugin::callback<int,
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cp_call_leave_scope>;
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self->connection->add_callback ("leave_scope", 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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libcp1_compile_v0 (struct gcc_base_context *s, const char *filename,
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int verbose)
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{
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libcp1_set_verbose (s, verbose);
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return libcp1_compile (s, filename);
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}
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static void
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libcp1_destroy (struct gcc_base_context *s)
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{
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libcp1 *self = (libcp1 *) 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_0,
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libcp1_set_arguments_v0,
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libcp1_set_source_file,
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libcp1_set_print_callback,
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libcp1_compile_v0,
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libcp1_destroy,
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libcp1_set_verbose,
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libcp1_compile,
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libcp1_set_arguments,
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libcp1_set_triplet_regexp,
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libcp1_set_driver_filename,
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};
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extern "C" gcc_cp_fe_context_function gcc_cp_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_cp_context *
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gcc_cp_fe_context (enum gcc_base_api_version base_version,
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enum gcc_cp_api_version cp_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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|| cp_version != GCC_CP_FE_VERSION_0)
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return NULL;
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return new libcp1 (&vtable, &cp_vtable);
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}
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