gcc/libcc1/libcc1.cc

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/* The library used by gdb.
Copyright (C) 2014-2016 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 <cc1plugin-config.h>
#include <vector>
#include <string>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdio.h>
#include <errno.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <sstream>
#include "rpc.hh"
#include "connection.hh"
#include "names.hh"
#include "callbacks.hh"
#include "gcc-interface.h"
#include "libiberty.h"
#include "xregex.h"
#include "findcomp.hh"
#include "compiler-name.h"
struct libcc1;
class libcc1_connection;
// The C compiler context that we hand back to our caller.
struct libcc1 : public gcc_c_context
{
libcc1 (const gcc_base_vtable *, const gcc_c_fe_vtable *);
~libcc1 ();
// A convenience function to print something.
void print (const char *str)
{
this->print_function (this->print_datum, str);
}
libcc1_connection *connection;
gcc_c_oracle_function *binding_oracle;
gcc_c_symbol_address_function *address_oracle;
void *oracle_datum;
void (*print_function) (void *datum, const char *message);
void *print_datum;
std::vector<std::string> args;
std::string source_file;
};
// A local subclass of connection that holds a back-pointer to the
// gcc_c_context object that we provide to our caller.
class libcc1_connection : public cc1_plugin::connection
{
public:
libcc1_connection (int fd, int aux_fd, libcc1 *b)
: connection (fd, aux_fd),
back_ptr (b)
{
}
virtual void print (const char *buf)
{
back_ptr->print (buf);
}
libcc1 *back_ptr;
};
libcc1::libcc1 (const gcc_base_vtable *v,
const gcc_c_fe_vtable *cv)
: connection (NULL),
binding_oracle (NULL),
address_oracle (NULL),
oracle_datum (NULL),
print_function (NULL),
print_datum (NULL),
args (),
source_file ()
{
base.ops = v;
c_ops = cv;
}
libcc1::~libcc1 ()
{
delete connection;
}
// This is a wrapper function that is called by the RPC system and
// that then forwards the call to the library user. Note that the
// return value is not used; the type cannot be 'void' due to
// limitations in our simple RPC.
int
call_binding_oracle (cc1_plugin::connection *conn,
enum gcc_c_oracle_request request,
const char *identifier)
{
libcc1 *self = ((libcc1_connection *) conn)->back_ptr;
self->binding_oracle (self->oracle_datum, self, request, identifier);
return 1;
}
// This is a wrapper function that is called by the RPC system and
// that then forwards the call to the library user.
gcc_address
call_symbol_address (cc1_plugin::connection *conn, const char *identifier)
{
libcc1 *self = ((libcc1_connection *) conn)->back_ptr;
return self->address_oracle (self->oracle_datum, self, identifier);
}
static void
set_callbacks (struct gcc_c_context *s,
gcc_c_oracle_function *binding_oracle,
gcc_c_symbol_address_function *address_oracle,
void *datum)
{
libcc1 *self = (libcc1 *) s;
self->binding_oracle = binding_oracle;
self->address_oracle = address_oracle;
self->oracle_datum = datum;
}
// Instances of these rpc<> template functions are installed into the
// "c_vtable". These functions are parameterized by type and method
// name and forward the call via the connection.
template<typename R, const char *&NAME>
R rpc (struct gcc_c_context *s)
{
libcc1 *self = (libcc1 *) s;
R result;
if (!cc1_plugin::call (self->connection, NAME, &result))
return 0;
return result;
}
template<typename R, const char *&NAME, typename A>
R rpc (struct gcc_c_context *s, A arg)
{
libcc1 *self = (libcc1 *) s;
R result;
if (!cc1_plugin::call (self->connection, NAME, &result, arg))
return 0;
return result;
}
template<typename R, const char *&NAME, typename A1, typename A2>
R rpc (struct gcc_c_context *s, A1 arg1, A2 arg2)
{
libcc1 *self = (libcc1 *) s;
R result;
if (!cc1_plugin::call (self->connection, NAME, &result, arg1, arg2))
return 0;
return result;
}
template<typename R, const char *&NAME, typename A1, typename A2, typename A3>
R rpc (struct gcc_c_context *s, A1 arg1, A2 arg2, A3 arg3)
{
libcc1 *self = (libcc1 *) s;
R result;
if (!cc1_plugin::call (self->connection, NAME, &result, arg1, arg2, arg3))
return 0;
return result;
}
template<typename R, const char *&NAME, typename A1, typename A2, typename A3,
typename A4>
R rpc (struct gcc_c_context *s, A1 arg1, A2 arg2, A3 arg3, A4 arg4)
{
libcc1 *self = (libcc1 *) s;
R result;
if (!cc1_plugin::call (self->connection, NAME, &result, arg1, arg2, arg3,
arg4))
return 0;
return result;
}
template<typename R, const char *&NAME, typename A1, typename A2, typename A3,
typename A4, typename A5>
R rpc (struct gcc_c_context *s, A1 arg1, A2 arg2, A3 arg3, A4 arg4, A5 arg5)
{
libcc1 *self = (libcc1 *) s;
R result;
if (!cc1_plugin::call (self->connection, NAME, &result, arg1, arg2, arg3,
arg4, arg5))
return 0;
return result;
}
template<typename R, const char *&NAME, typename A1, typename A2, typename A3,
typename A4, typename A5, typename A6, typename A7>
R rpc (struct gcc_c_context *s, A1 arg1, A2 arg2, A3 arg3, A4 arg4, A5 arg5,
A6 arg6, A7 arg7)
{
libcc1 *self = (libcc1 *) s;
R result;
if (!cc1_plugin::call (self->connection, NAME, &result, arg1, arg2, arg3,
arg4, arg5, arg6, arg7))
return 0;
return result;
}
static const struct gcc_c_fe_vtable c_vtable =
{
GCC_C_FE_VERSION_0,
set_callbacks,
#define GCC_METHOD0(R, N) \
rpc<R, cc1_plugin::N>,
#define GCC_METHOD1(R, N, A) \
rpc<R, cc1_plugin::N, A>,
#define GCC_METHOD2(R, N, A, B) \
rpc<R, cc1_plugin::N, A, B>,
#define GCC_METHOD3(R, N, A, B, C) \
rpc<R, cc1_plugin::N, A, B, C>,
#define GCC_METHOD4(R, N, A, B, C, D) \
rpc<R, cc1_plugin::N, A, B, C, D>,
#define GCC_METHOD5(R, N, A, B, C, D, E) \
rpc<R, cc1_plugin::N, A, B, C, D, E>,
#define GCC_METHOD7(R, N, A, B, C, D, E, F, G) \
rpc<R, cc1_plugin::N, A, B, C, D, E, F, G>,
#include "gcc-c-fe.def"
#undef GCC_METHOD0
#undef GCC_METHOD1
#undef GCC_METHOD2
#undef GCC_METHOD3
#undef GCC_METHOD4
#undef GCC_METHOD5
#undef GCC_METHOD7
};
// Construct an appropriate regexp to match the compiler name.
static std::string
make_regexp (const char *triplet_regexp, const char *compiler)
{
std::stringstream buf;
buf << "^" << triplet_regexp << "-";
// Quote the compiler name in case it has something funny in it.
for (const char *p = compiler; *p; ++p)
{
switch (*p)
{
case '.':
case '^':
case '$':
case '*':
case '+':
case '?':
case '(':
case ')':
case '[':
case '{':
case '\\':
case '|':
buf << '\\';
break;
}
buf << *p;
}
buf << "$";
return buf.str ();
}
static char *
libcc1_set_arguments (struct gcc_base_context *s,
const char *triplet_regexp,
int argc, char **argv)
{
libcc1 *self = (libcc1 *) s;
regex_t triplet;
int code;
std::string rx = make_regexp (triplet_regexp, COMPILER_NAME);
code = regcomp (&triplet, rx.c_str (), REG_EXTENDED | REG_NOSUB);
if (code != 0)
{
size_t len = regerror (code, &triplet, NULL, 0);
char err[len];
regerror (code, &triplet, err, len);
return concat ("Could not compile regexp \"",
rx.c_str (),
"\": ",
err,
(char *) NULL);
}
std::string compiler;
if (!find_compiler (triplet, &compiler))
{
regfree (&triplet);
return concat ("Could not find a compiler matching \"",
rx.c_str (),
"\"",
(char *) NULL);
}
regfree (&triplet);
self->args.push_back (compiler);
for (int i = 0; i < argc; ++i)
self->args.push_back (argv[i]);
return NULL;
}
static void
libcc1_set_source_file (struct gcc_base_context *s,
const char *file)
{
libcc1 *self = (libcc1 *) s;
self->source_file = file;
}
static void
libcc1_set_print_callback (struct gcc_base_context *s,
void (*print_function) (void *datum,
const char *message),
void *datum)
{
libcc1 *self = (libcc1 *) s;
self->print_function = print_function;
self->print_datum = datum;
}
static int
fork_exec (libcc1 *self, char **argv, int spair_fds[2], int stderr_fds[2])
{
pid_t child_pid = fork ();
if (child_pid == -1)
{
close (spair_fds[0]);
close (spair_fds[1]);
close (stderr_fds[0]);
close (stderr_fds[1]);
return 0;
}
if (child_pid == 0)
{
// Child.
dup2 (stderr_fds[1], 1);
dup2 (stderr_fds[1], 2);
close (stderr_fds[0]);
close (stderr_fds[1]);
close (spair_fds[0]);
execvp (argv[0], argv);
_exit (127);
}
else
{
// Parent.
close (spair_fds[1]);
close (stderr_fds[1]);
cc1_plugin::status result = cc1_plugin::FAIL;
if (self->connection->send ('H')
&& ::cc1_plugin::marshall (self->connection, GCC_C_FE_VERSION_0))
result = self->connection->wait_for_query ();
close (spair_fds[0]);
close (stderr_fds[0]);
while (true)
{
int status;
if (waitpid (child_pid, &status, 0) == -1)
{
if (errno != EINTR)
return 0;
}
if (!WIFEXITED (status) || WEXITSTATUS (status) != 0)
return 0;
break;
}
if (!result)
return 0;
return 1;
}
}
static int
libcc1_compile (struct gcc_base_context *s,
const char *filename,
int verbose)
{
libcc1 *self = (libcc1 *) s;
int fds[2];
if (socketpair (AF_UNIX, SOCK_STREAM, 0, fds) != 0)
{
self->print ("could not create socketpair\n");
return 0;
}
int stderr_fds[2];
if (pipe (stderr_fds) != 0)
{
self->print ("could not create pipe\n");
close (fds[0]);
close (fds[1]);
return 0;
}
self->args.push_back ("-fplugin=libcc1plugin");
char buf[100];
if (snprintf (buf, sizeof (buf), "-fplugin-arg-libcc1plugin-fd=%d", fds[1])
>= (long) sizeof (buf))
abort ();
self->args.push_back (buf);
self->args.push_back (self->source_file);
self->args.push_back ("-c");
self->args.push_back ("-o");
self->args.push_back (filename);
if (verbose)
self->args.push_back ("-v");
self->connection = new libcc1_connection (fds[0], stderr_fds[0], self);
cc1_plugin::callback_ftype *fun
= cc1_plugin::callback<int,
enum gcc_c_oracle_request,
const char *,
call_binding_oracle>;
self->connection->add_callback ("binding_oracle", fun);
fun = cc1_plugin::callback<gcc_address,
const char *,
call_symbol_address>;
self->connection->add_callback ("address_oracle", fun);
char **argv = new (std::nothrow) char *[self->args.size () + 1];
if (argv == NULL)
return 0;
for (unsigned int i = 0; i < self->args.size (); ++i)
argv[i] = const_cast<char *> (self->args[i].c_str ());
argv[self->args.size ()] = NULL;
return fork_exec (self, argv, fds, stderr_fds);
}
static void
libcc1_destroy (struct gcc_base_context *s)
{
libcc1 *self = (libcc1 *) s;
delete self;
}
static const struct gcc_base_vtable vtable =
{
GCC_FE_VERSION_0,
libcc1_set_arguments,
libcc1_set_source_file,
libcc1_set_print_callback,
libcc1_compile,
libcc1_destroy
};
extern "C" gcc_c_fe_context_function gcc_c_fe_context;
#ifdef __GNUC__
#pragma GCC visibility push(default)
#endif
extern "C"
struct gcc_c_context *
gcc_c_fe_context (enum gcc_base_api_version base_version,
enum gcc_c_api_version c_version)
{
if (base_version != GCC_FE_VERSION_0 || c_version != GCC_C_FE_VERSION_0)
return NULL;
return new libcc1 (&vtable, &c_vtable);
}