libcc1/libcc1.cc

   1 /* The library used by gdb.
   2    Copyright (C) 2014-2016 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #include <cc1plugin-config.h>
  21 #include <vector>
  22 #include <string>
  23 #include <sys/socket.h>
  24 #include <sys/types.h>
  25 #include <unistd.h>
  26 #include <sys/wait.h>
  27 #include <stdio.h>
  28 #include <errno.h>
  29 #include <sys/stat.h>
  30 #include <stdlib.h>
  31 #include <sstream>
  32 #include "rpc.hh"
  33 #include "connection.hh"
  34 #include "names.hh"
  35 #include "callbacks.hh"
  36 #include "gcc-interface.h"
  37 #include "libiberty.h"
  38 #include "xregex.h"
  39 #include "findcomp.hh"
  40 #include "compiler-name.h"
  41
  42 struct libcc1;
  43
  44 class libcc1_connection;
  45
  46 // The C compiler context that we hand back to our caller.
  47 struct libcc1 : public gcc_c_context
  48 {
  49   libcc1 (const gcc_base_vtable *, const gcc_c_fe_vtable *);
  50   ~libcc1 ();
  51
  52   // A convenience function to print something.
  53   void print (const char *str)
  54   {
  55     this->print_function (this->print_datum, str);
  56   }
  57
  58   libcc1_connection *connection;
  59
  60   gcc_c_oracle_function *binding_oracle;
  61   gcc_c_symbol_address_function *address_oracle;
  62   void *oracle_datum;
  63
  64   void (*print_function) (void *datum, const char *message);
  65   void *print_datum;
  66
  67   std::vector<std::string> args;
  68   std::string source_file;
  69 };
  70
  71 // A local subclass of connection that holds a back-pointer to the
  72 // gcc_c_context object that we provide to our caller.
  73 class libcc1_connection : public cc1_plugin::connection
  74 {
  75 public:
  76
  77   libcc1_connection (int fd, int aux_fd, libcc1 *b)
  78     : connection (fd, aux_fd),
  79       back_ptr (b)
  80   {
  81   }
  82
  83   virtual void print (const char *buf)
  84   {
  85     back_ptr->print (buf);
  86   }
  87
  88   libcc1 *back_ptr;
  89 };
  90
  91 libcc1::libcc1 (const gcc_base_vtable *v,
  92                 const gcc_c_fe_vtable *cv)
  93   : connection (NULL),
  94     binding_oracle (NULL),
  95     address_oracle (NULL),
  96     oracle_datum (NULL),
  97     print_function (NULL),
  98     print_datum (NULL),
  99     args (),
 100     source_file ()
 101 {
 102   base.ops = v;
 103   c_ops = cv;
 104 }
 105
 106 libcc1::~libcc1 ()
 107 {
 108   delete connection;
 109 }
 110
 111 \f
 112
 113 // This is a wrapper function that is called by the RPC system and
 114 // that then forwards the call to the library user.  Note that the
 115 // return value is not used; the type cannot be 'void' due to
 116 // limitations in our simple RPC.
 117 int
 118 call_binding_oracle (cc1_plugin::connection *conn,
 119                      enum gcc_c_oracle_request request,
 120                      const char *identifier)
 121 {
 122   libcc1 *self = ((libcc1_connection *) conn)->back_ptr;
 123
 124   self->binding_oracle (self->oracle_datum, self, request, identifier);
 125   return 1;
 126 }
 127
 128 // This is a wrapper function that is called by the RPC system and
 129 // that then forwards the call to the library user.
 130 gcc_address
 131 call_symbol_address (cc1_plugin::connection *conn, const char *identifier)
 132 {
 133   libcc1 *self = ((libcc1_connection *) conn)->back_ptr;
 134
 135   return self->address_oracle (self->oracle_datum, self, identifier);
 136 }
 137
 138 \f
 139
 140 static void
 141 set_callbacks (struct gcc_c_context *s,
 142                gcc_c_oracle_function *binding_oracle,
 143                gcc_c_symbol_address_function *address_oracle,
 144                void *datum)
 145 {
 146   libcc1 *self = (libcc1 *) s;
 147
 148   self->binding_oracle = binding_oracle;
 149   self->address_oracle = address_oracle;
 150   self->oracle_datum = datum;
 151 }
 152
 153 // Instances of these rpc<> template functions are installed into the
 154 // "c_vtable".  These functions are parameterized by type and method
 155 // name and forward the call via the connection.
 156
 157 template<typename R, const char *&NAME>
 158 R rpc (struct gcc_c_context *s)
 159 {
 160   libcc1 *self = (libcc1 *) s;
 161   R result;
 162
 163   if (!cc1_plugin::call (self->connection, NAME, &result))
 164     return 0;
 165   return result;
 166 }
 167
 168 template<typename R, const char *&NAME, typename A>
 169 R rpc (struct gcc_c_context *s, A arg)
 170 {
 171   libcc1 *self = (libcc1 *) s;
 172   R result;
 173
 174   if (!cc1_plugin::call (self->connection, NAME, &result, arg))
 175     return 0;
 176   return result;
 177 }
 178
 179 template<typename R, const char *&NAME, typename A1, typename A2>
 180 R rpc (struct gcc_c_context *s, A1 arg1, A2 arg2)
 181 {
 182   libcc1 *self = (libcc1 *) s;
 183   R result;
 184
 185   if (!cc1_plugin::call (self->connection, NAME, &result, arg1, arg2))
 186     return 0;
 187   return result;
 188 }
 189
 190 template<typename R, const char *&NAME, typename A1, typename A2, typename A3>
 191 R rpc (struct gcc_c_context *s, A1 arg1, A2 arg2, A3 arg3)
 192 {
 193   libcc1 *self = (libcc1 *) s;
 194   R result;
 195
 196   if (!cc1_plugin::call (self->connection, NAME, &result, arg1, arg2, arg3))
 197     return 0;
 198   return result;
 199 }
 200
 201 template<typename R, const char *&NAME, typename A1, typename A2, typename A3,
 202          typename A4>
 203 R rpc (struct gcc_c_context *s, A1 arg1, A2 arg2, A3 arg3, A4 arg4)
 204 {
 205   libcc1 *self = (libcc1 *) s;
 206   R result;
 207
 208   if (!cc1_plugin::call (self->connection, NAME, &result, arg1, arg2, arg3,
 209                          arg4))
 210     return 0;
 211   return result;
 212 }
 213
 214 template<typename R, const char *&NAME, typename A1, typename A2, typename A3,
 215          typename A4, typename A5>
 216 R rpc (struct gcc_c_context *s, A1 arg1, A2 arg2, A3 arg3, A4 arg4, A5 arg5)
 217 {
 218   libcc1 *self = (libcc1 *) s;
 219   R result;
 220
 221   if (!cc1_plugin::call (self->connection, NAME, &result, arg1, arg2, arg3,
 222                          arg4, arg5))
 223     return 0;
 224   return result;
 225 }
 226
 227 template<typename R, const char *&NAME, typename A1, typename A2, typename A3,
 228          typename A4, typename A5, typename A6, typename A7>
 229 R rpc (struct gcc_c_context *s, A1 arg1, A2 arg2, A3 arg3, A4 arg4, A5 arg5,
 230        A6 arg6, A7 arg7)
 231 {
 232   libcc1 *self = (libcc1 *) s;
 233   R result;
 234
 235   if (!cc1_plugin::call (self->connection, NAME, &result, arg1, arg2, arg3,
 236                          arg4, arg5, arg6, arg7))
 237     return 0;
 238   return result;
 239 }
 240
 241 static const struct gcc_c_fe_vtable c_vtable =
 242 {
 243   GCC_C_FE_VERSION_0,
 244   set_callbacks,
 245
 246 #define GCC_METHOD0(R, N) \
 247   rpc<R, cc1_plugin::N>,
 248 #define GCC_METHOD1(R, N, A) \
 249   rpc<R, cc1_plugin::N, A>,
 250 #define GCC_METHOD2(R, N, A, B) \
 251   rpc<R, cc1_plugin::N, A, B>,
 252 #define GCC_METHOD3(R, N, A, B, C) \
 253   rpc<R, cc1_plugin::N, A, B, C>,
 254 #define GCC_METHOD4(R, N, A, B, C, D) \
 255   rpc<R, cc1_plugin::N, A, B, C, D>,
 256 #define GCC_METHOD5(R, N, A, B, C, D, E) \
 257   rpc<R, cc1_plugin::N, A, B, C, D, E>,
 258 #define GCC_METHOD7(R, N, A, B, C, D, E, F, G) \
 259   rpc<R, cc1_plugin::N, A, B, C, D, E, F, G>,
 260
 261 #include "gcc-c-fe.def"
 262
 263 #undef GCC_METHOD0
 264 #undef GCC_METHOD1
 265 #undef GCC_METHOD2
 266 #undef GCC_METHOD3
 267 #undef GCC_METHOD4
 268 #undef GCC_METHOD5
 269 #undef GCC_METHOD7
 270 };
 271
 272 \f
 273
 274 // Construct an appropriate regexp to match the compiler name.
 275 static std::string
 276 make_regexp (const char *triplet_regexp, const char *compiler)
 277 {
 278   std::stringstream buf;
 279
 280   buf << "^" << triplet_regexp << "-";
 281
 282   // Quote the compiler name in case it has something funny in it.
 283   for (const char *p = compiler; *p; ++p)
 284     {
 285       switch (*p)
 286         {
 287         case '.':
 288         case '^':
 289         case '$':
 290         case '*':
 291         case '+':
 292         case '?':
 293         case '(':
 294         case ')':
 295         case '[':
 296         case '{':
 297         case '\\':
 298         case '|':
 299           buf << '\\';
 300           break;
 301         }
 302       buf << *p;
 303     }
 304   buf << "$";
 305
 306   return buf.str ();
 307 }
 308
 309 static char *
 310 libcc1_set_arguments (struct gcc_base_context *s,
 311                       const char *triplet_regexp,
 312                       int argc, char **argv)
 313 {
 314   libcc1 *self = (libcc1 *) s;
 315   regex_t triplet;
 316   int code;
 317
 318   std::string rx = make_regexp (triplet_regexp, COMPILER_NAME);
 319   code = regcomp (&triplet, rx.c_str (), REG_EXTENDED | REG_NOSUB);
 320   if (code != 0)
 321     {
 322       size_t len = regerror (code, &triplet, NULL, 0);
 323       char err[len];
 324
 325       regerror (code, &triplet, err, len);
 326
 327       return concat ("Could not compile regexp \"",
 328                      rx.c_str (),
 329                      "\": ",
 330                      err,
 331                      (char *) NULL);
 332     }
 333
 334   std::string compiler;
 335   if (!find_compiler (triplet, &compiler))
 336     {
 337       regfree (&triplet);
 338       return concat ("Could not find a compiler matching \"",
 339                      rx.c_str (),
 340                      "\"",
 341                      (char *) NULL);
 342     }
 343   regfree (&triplet);
 344
 345   self->args.push_back (compiler);
 346
 347   for (int i = 0; i < argc; ++i)
 348     self->args.push_back (argv[i]);
 349
 350   return NULL;
 351 }
 352
 353 static void
 354 libcc1_set_source_file (struct gcc_base_context *s,
 355                         const char *file)
 356 {
 357   libcc1 *self = (libcc1 *) s;
 358
 359   self->source_file = file;
 360 }
 361
 362 static void
 363 libcc1_set_print_callback (struct gcc_base_context *s,
 364                            void (*print_function) (void *datum,
 365                                                    const char *message),
 366                            void *datum)
 367 {
 368   libcc1 *self = (libcc1 *) s;
 369
 370   self->print_function = print_function;
 371   self->print_datum = datum;
 372 }
 373
 374 static int
 375 fork_exec (libcc1 *self, char **argv, int spair_fds[2], int stderr_fds[2])
 376 {
 377   pid_t child_pid = fork ();
 378
 379   if (child_pid == -1)
 380     {
 381       close (spair_fds[0]);
 382       close (spair_fds[1]);
 383       close (stderr_fds[0]);
 384       close (stderr_fds[1]);
 385       return 0;
 386     }
 387
 388   if (child_pid == 0)
 389     {
 390       // Child.
 391       dup2 (stderr_fds[1], 1);
 392       dup2 (stderr_fds[1], 2);
 393       close (stderr_fds[0]);
 394       close (stderr_fds[1]);
 395       close (spair_fds[0]);
 396
 397       execvp (argv[0], argv);
 398       _exit (127);
 399     }
 400   else
 401     {
 402       // Parent.
 403       close (spair_fds[1]);
 404       close (stderr_fds[1]);
 405
 406       cc1_plugin::status result = cc1_plugin::FAIL;
 407       if (self->connection->send ('H')
 408           && ::cc1_plugin::marshall (self->connection, GCC_C_FE_VERSION_0))
 409         result = self->connection->wait_for_query ();
 410
 411       close (spair_fds[0]);
 412       close (stderr_fds[0]);
 413
 414       while (true)
 415         {
 416           int status;
 417
 418           if (waitpid (child_pid, &status, 0) == -1)
 419             {
 420               if (errno != EINTR)
 421                 return 0;
 422             }
 423
 424           if (!WIFEXITED (status) || WEXITSTATUS (status) != 0)
 425             return 0;
 426           break;
 427         }
 428
 429       if (!result)
 430         return 0;
 431       return 1;
 432     }
 433 }
 434
 435 static int
 436 libcc1_compile (struct gcc_base_context *s,
 437                 const char *filename,
 438                 int verbose)
 439 {
 440   libcc1 *self = (libcc1 *) s;
 441
 442   int fds[2];
 443   if (socketpair (AF_UNIX, SOCK_STREAM, 0, fds) != 0)
 444     {
 445       self->print ("could not create socketpair\n");
 446       return 0;
 447     }
 448
 449   int stderr_fds[2];
 450   if (pipe (stderr_fds) != 0)
 451     {
 452       self->print ("could not create pipe\n");
 453       close (fds[0]);
 454       close (fds[1]);
 455       return 0;
 456     }
 457
 458   self->args.push_back ("-fplugin=libcc1plugin");
 459   char buf[100];
 460   if (snprintf (buf, sizeof (buf), "-fplugin-arg-libcc1plugin-fd=%d", fds[1])
 461       >= (long) sizeof (buf))
 462     abort ();
 463   self->args.push_back (buf);
 464
 465   self->args.push_back (self->source_file);
 466   self->args.push_back ("-c");
 467   self->args.push_back ("-o");
 468   self->args.push_back (filename);
 469   if (verbose)
 470     self->args.push_back ("-v");
 471
 472   self->connection = new libcc1_connection (fds[0], stderr_fds[0], self);
 473
 474   cc1_plugin::callback_ftype *fun
 475     = cc1_plugin::callback<int,
 476                            enum gcc_c_oracle_request,
 477                            const char *,
 478                            call_binding_oracle>;
 479   self->connection->add_callback ("binding_oracle", fun);
 480
 481   fun = cc1_plugin::callback<gcc_address,
 482                              const char *,
 483                              call_symbol_address>;
 484   self->connection->add_callback ("address_oracle", fun);
 485
 486   char **argv = new (std::nothrow) char *[self->args.size () + 1];
 487   if (argv == NULL)
 488     return 0;
 489
 490   for (unsigned int i = 0; i < self->args.size (); ++i)
 491     argv[i] = const_cast<char *> (self->args[i].c_str ());
 492   argv[self->args.size ()] = NULL;
 493
 494   return fork_exec (self, argv, fds, stderr_fds);
 495 }
 496
 497 static void
 498 libcc1_destroy (struct gcc_base_context *s)
 499 {
 500   libcc1 *self = (libcc1 *) s;
 501
 502   delete self;
 503 }
 504
 505 static const struct gcc_base_vtable vtable =
 506 {
 507   GCC_FE_VERSION_0,
 508   libcc1_set_arguments,
 509   libcc1_set_source_file,
 510   libcc1_set_print_callback,
 511   libcc1_compile,
 512   libcc1_destroy
 513 };
 514
 515 extern "C" gcc_c_fe_context_function gcc_c_fe_context;
 516
 517 #ifdef __GNUC__
 518 #pragma GCC visibility push(default)
 519 #endif
 520
 521 extern "C"
 522 struct gcc_c_context *
 523 gcc_c_fe_context (enum gcc_base_api_version base_version,
 524                   enum gcc_c_api_version c_version)
 525 {
 526   if (base_version != GCC_FE_VERSION_0 || c_version != GCC_C_FE_VERSION_0)
 527     return NULL;
 528
 529   return new libcc1 (&vtable, &c_vtable);
 530 }