gdb/compile/compile.c

   1 /* General Compile and inject code
   2
   3    Copyright (C) 2014-2019 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "top.h"
  22 #include "ui-out.h"
  23 #include "command.h"
  24 #include "cli/cli-script.h"
  25 #include "cli/cli-utils.h"
  26 #include "completer.h"
  27 #include "gdbcmd.h"
  28 #include "compile.h"
  29 #include "compile-internal.h"
  30 #include "compile-object-load.h"
  31 #include "compile-object-run.h"
  32 #include "language.h"
  33 #include "frame.h"
  34 #include "source.h"
  35 #include "block.h"
  36 #include "arch-utils.h"
  37 #include "common/filestuff.h"
  38 #include "target.h"
  39 #include "osabi.h"
  40 #include "common/gdb_wait.h"
  41 #include "valprint.h"
  42 #include "common/gdb_optional.h"
  43 #include "common/gdb_unlinker.h"
  44 #include "common/pathstuff.h"
  45
  46 \f
  47
  48 /* Initial filename for temporary files.  */
  49
  50 #define TMP_PREFIX "/tmp/gdbobj-"
  51
  52 /* Hold "compile" commands.  */
  53
  54 static struct cmd_list_element *compile_command_list;
  55
  56 /* Debug flag for "compile" commands.  */
  57
  58 int compile_debug;
  59
  60 /* Object of this type are stored in the compiler's symbol_err_map.  */
  61
  62 struct symbol_error
  63 {
  64   /* The symbol.  */
  65
  66   const struct symbol *sym;
  67
  68   /* The error message to emit.  This is malloc'd and owned by the
  69      hash table.  */
  70
  71   char *message;
  72 };
  73
  74 /* Hash a type_map_instance.  */
  75
  76 static hashval_t
  77 hash_type_map_instance (const void *p)
  78 {
  79   const struct type_map_instance *inst = (const struct type_map_instance *) p;
  80
  81   return htab_hash_pointer (inst->type);
  82 }
  83
  84 /* Check two type_map_instance objects for equality.  */
  85
  86 static int
  87 eq_type_map_instance (const void *a, const void *b)
  88 {
  89   const struct type_map_instance *insta = (const struct type_map_instance *) a;
  90   const struct type_map_instance *instb = (const struct type_map_instance *) b;
  91
  92   return insta->type == instb->type;
  93 }
  94
  95 /* Hash function for struct symbol_error.  */
  96
  97 static hashval_t
  98 hash_symbol_error (const void *a)
  99 {
 100   const struct symbol_error *se = (const struct symbol_error *) a;
 101
 102   return htab_hash_pointer (se->sym);
 103 }
 104
 105 /* Equality function for struct symbol_error.  */
 106
 107 static int
 108 eq_symbol_error (const void *a, const void *b)
 109 {
 110   const struct symbol_error *sea = (const struct symbol_error *) a;
 111   const struct symbol_error *seb = (const struct symbol_error *) b;
 112
 113   return sea->sym == seb->sym;
 114 }
 115
 116 /* Deletion function for struct symbol_error.  */
 117
 118 static void
 119 del_symbol_error (void *a)
 120 {
 121   struct symbol_error *se = (struct symbol_error *) a;
 122
 123   xfree (se->message);
 124   xfree (se);
 125 }
 126
 127 /* Constructor for compile_instance.  */
 128
 129 compile_instance::compile_instance (struct gcc_base_context *gcc_fe,
 130                                     const char *options)
 131   : m_gcc_fe (gcc_fe), m_gcc_target_options (options),
 132     m_type_map (htab_create_alloc (10, hash_type_map_instance,
 133                                    eq_type_map_instance,
 134                                    xfree, xcalloc, xfree)),
 135     m_symbol_err_map (htab_create_alloc (10, hash_symbol_error,
 136                                          eq_symbol_error, del_symbol_error,
 137                                          xcalloc, xfree))
 138 {
 139 }
 140
 141 /* See compile-internal.h.  */
 142
 143 bool
 144 compile_instance::get_cached_type (struct type *type, gcc_type *ret) const
 145 {
 146   struct type_map_instance inst, *found;
 147
 148   inst.type = type;
 149   found = (struct type_map_instance *) htab_find (m_type_map.get (), &inst);
 150   if (found != NULL)
 151     {
 152       *ret = found->gcc_type_handle;
 153       return true;
 154     }
 155
 156   return false;
 157 }
 158
 159 /* See compile-internal.h.  */
 160
 161 void
 162 compile_instance::insert_type (struct type *type, gcc_type gcc_type)
 163 {
 164   struct type_map_instance inst, *add;
 165   void **slot;
 166
 167   inst.type = type;
 168   inst.gcc_type_handle = gcc_type;
 169   slot = htab_find_slot (m_type_map.get (), &inst, INSERT);
 170
 171   add = (struct type_map_instance *) *slot;
 172   /* The type might have already been inserted in order to handle
 173      recursive types.  */
 174   if (add != NULL && add->gcc_type_handle != gcc_type)
 175     error (_("Unexpected type id from GCC, check you use recent enough GCC."));
 176
 177   if (add == NULL)
 178     {
 179       add = XNEW (struct type_map_instance);
 180       *add = inst;
 181       *slot = add;
 182     }
 183 }
 184
 185 /* See compile-internal.h.  */
 186
 187 void
 188 compile_instance::insert_symbol_error (const struct symbol *sym,
 189                                        const char *text)
 190 {
 191   struct symbol_error e;
 192   void **slot;
 193
 194   e.sym = sym;
 195   slot = htab_find_slot (m_symbol_err_map.get (), &e, INSERT);
 196   if (*slot == NULL)
 197     {
 198       struct symbol_error *ep = XNEW (struct symbol_error);
 199
 200       ep->sym = sym;
 201       ep->message = xstrdup (text);
 202       *slot = ep;
 203     }
 204 }
 205
 206 /* See compile-internal.h.  */
 207
 208 void
 209 compile_instance::error_symbol_once (const struct symbol *sym)
 210 {
 211   struct symbol_error search;
 212   struct symbol_error *err;
 213
 214   if (m_symbol_err_map == NULL)
 215     return;
 216
 217   search.sym = sym;
 218   err = (struct symbol_error *) htab_find (m_symbol_err_map.get (), &search);
 219   if (err == NULL || err->message == NULL)
 220     return;
 221
 222   gdb::unique_xmalloc_ptr<char> message (err->message);
 223   err->message = NULL;
 224   error (_("%s"), message.get ());
 225 }
 226
 227 /* Implement "show debug compile".  */
 228
 229 static void
 230 show_compile_debug (struct ui_file *file, int from_tty,
 231                     struct cmd_list_element *c, const char *value)
 232 {
 233   fprintf_filtered (file, _("Compile debugging is %s.\n"), value);
 234 }
 235
 236 \f
 237
 238 /* Check *ARG for a "-raw" or "-r" argument.  Return 0 if not seen.
 239    Return 1 if seen and update *ARG.  */
 240
 241 static int
 242 check_raw_argument (const char **arg)
 243 {
 244   *arg = skip_spaces (*arg);
 245
 246   if (arg != NULL
 247       && (check_for_argument (arg, "-raw", sizeof ("-raw") - 1)
 248           || check_for_argument (arg, "-r", sizeof ("-r") - 1)))
 249       return 1;
 250   return 0;
 251 }
 252
 253 /* Handle the input from the 'compile file' command.  The "compile
 254    file" command is used to evaluate an expression contained in a file
 255    that may contain calls to the GCC compiler.  */
 256
 257 static void
 258 compile_file_command (const char *arg, int from_tty)
 259 {
 260   enum compile_i_scope_types scope = COMPILE_I_SIMPLE_SCOPE;
 261
 262   scoped_restore save_async = make_scoped_restore (&current_ui->async, 0);
 263
 264   /* Check the user did not just <enter> after command.  */
 265   if (arg == NULL)
 266     error (_("You must provide a filename for this command."));
 267
 268   /* Check if a raw (-r|-raw) argument is provided.  */
 269   if (arg != NULL && check_raw_argument (&arg))
 270     {
 271       scope = COMPILE_I_RAW_SCOPE;
 272       arg = skip_spaces (arg);
 273     }
 274
 275   /* After processing arguments, check there is a filename at the end
 276      of the command.  */
 277   if (arg[0] == '\0')
 278     error (_("You must provide a filename with the raw option set."));
 279
 280   if (arg[0] == '-')
 281     error (_("Unknown argument specified."));
 282
 283   arg = skip_spaces (arg);
 284   gdb::unique_xmalloc_ptr<char> abspath = gdb_abspath (arg);
 285   std::string buffer = string_printf ("#include \"%s\"\n", abspath.get ());
 286   eval_compile_command (NULL, buffer.c_str (), scope, NULL);
 287 }
 288
 289 /* Handle the input from the 'compile code' command.  The
 290    "compile code" command is used to evaluate an expression that may
 291    contain calls to the GCC compiler.  The language expected in this
 292    compile command is the language currently set in GDB.  */
 293
 294 static void
 295 compile_code_command (const char *arg, int from_tty)
 296 {
 297   enum compile_i_scope_types scope = COMPILE_I_SIMPLE_SCOPE;
 298
 299   scoped_restore save_async = make_scoped_restore (&current_ui->async, 0);
 300
 301   if (arg != NULL && check_raw_argument (&arg))
 302     {
 303       scope = COMPILE_I_RAW_SCOPE;
 304       arg = skip_spaces (arg);
 305     }
 306
 307   arg = skip_spaces (arg);
 308
 309   if (arg != NULL && !check_for_argument (&arg, "--", sizeof ("--") - 1))
 310     {
 311       if (arg[0] == '-')
 312         error (_("Unknown argument specified."));
 313     }
 314
 315   if (arg && *arg)
 316     eval_compile_command (NULL, arg, scope, NULL);
 317   else
 318     {
 319       counted_command_line l = get_command_line (compile_control, "");
 320
 321       l->control_u.compile.scope = scope;
 322       execute_control_command_untraced (l.get ());
 323     }
 324 }
 325
 326 /* Callback for compile_print_command.  */
 327
 328 void
 329 compile_print_value (struct value *val, void *data_voidp)
 330 {
 331   const struct format_data *fmtp = (const struct format_data *) data_voidp;
 332
 333   print_value (val, fmtp);
 334 }
 335
 336 /* Handle the input from the 'compile print' command.  The "compile
 337    print" command is used to evaluate and print an expression that may
 338    contain calls to the GCC compiler.  The language expected in this
 339    compile command is the language currently set in GDB.  */
 340
 341 static void
 342 compile_print_command (const char *arg, int from_tty)
 343 {
 344   enum compile_i_scope_types scope = COMPILE_I_PRINT_ADDRESS_SCOPE;
 345   struct format_data fmt;
 346
 347   scoped_restore save_async = make_scoped_restore (&current_ui->async, 0);
 348
 349   /* Passing &FMT as SCOPE_DATA is safe as do_module_cleanup will not
 350      touch the stale pointer if compile_object_run has already quit.  */
 351   print_command_parse_format (&arg, "compile print", &fmt);
 352
 353   if (arg && *arg)
 354     eval_compile_command (NULL, arg, scope, &fmt);
 355   else
 356     {
 357       counted_command_line l = get_command_line (compile_control, "");
 358
 359       l->control_u.compile.scope = scope;
 360       l->control_u.compile.scope_data = &fmt;
 361       execute_control_command_untraced (l.get ());
 362     }
 363 }
 364
 365 /* A cleanup function to remove a directory and all its contents.  */
 366
 367 static void
 368 do_rmdir (void *arg)
 369 {
 370   const char *dir = (const char *) arg;
 371   char *zap;
 372   int wstat;
 373
 374   gdb_assert (startswith (dir, TMP_PREFIX));
 375   zap = concat ("rm -rf ", dir, (char *) NULL);
 376   wstat = system (zap);
 377   if (wstat == -1 || !WIFEXITED (wstat) || WEXITSTATUS (wstat) != 0)
 378     warning (_("Could not remove temporary directory %s"), dir);
 379   XDELETEVEC (zap);
 380 }
 381
 382 /* Return the name of the temporary directory to use for .o files, and
 383    arrange for the directory to be removed at shutdown.  */
 384
 385 static const char *
 386 get_compile_file_tempdir (void)
 387 {
 388   static char *tempdir_name;
 389
 390 #define TEMPLATE TMP_PREFIX "XXXXXX"
 391   char tname[sizeof (TEMPLATE)];
 392
 393   if (tempdir_name != NULL)
 394     return tempdir_name;
 395
 396   strcpy (tname, TEMPLATE);
 397 #undef TEMPLATE
 398   tempdir_name = mkdtemp (tname);
 399   if (tempdir_name == NULL)
 400     perror_with_name (_("Could not make temporary directory"));
 401
 402   tempdir_name = xstrdup (tempdir_name);
 403   make_final_cleanup (do_rmdir, tempdir_name);
 404   return tempdir_name;
 405 }
 406
 407 /* Compute the names of source and object files to use.  */
 408
 409 static compile_file_names
 410 get_new_file_names ()
 411 {
 412   static int seq;
 413   const char *dir = get_compile_file_tempdir ();
 414
 415   ++seq;
 416
 417   return compile_file_names (string_printf ("%s%sout%d.c",
 418                                             dir, SLASH_STRING, seq),
 419                              string_printf ("%s%sout%d.o",
 420                                             dir, SLASH_STRING, seq));
 421 }
 422
 423 /* Get the block and PC at which to evaluate an expression.  */
 424
 425 static const struct block *
 426 get_expr_block_and_pc (CORE_ADDR *pc)
 427 {
 428   const struct block *block = get_selected_block (pc);
 429
 430   if (block == NULL)
 431     {
 432       struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 433
 434       if (cursal.symtab)
 435         block = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (cursal.symtab),
 436                                    STATIC_BLOCK);
 437       if (block != NULL)
 438         *pc = BLOCK_ENTRY_PC (block);
 439     }
 440   else
 441     *pc = BLOCK_ENTRY_PC (block);
 442
 443   return block;
 444 }
 445
 446 /* Call buildargv (via gdb_argv), set its result for S into *ARGVP but
 447    calculate also the number of parsed arguments into *ARGCP.  If
 448    buildargv has returned NULL then *ARGCP is set to zero.  */
 449
 450 static void
 451 build_argc_argv (const char *s, int *argcp, char ***argvp)
 452 {
 453   gdb_argv args (s);
 454
 455   *argcp = args.count ();
 456   *argvp = args.release ();
 457 }
 458
 459 /* String for 'set compile-args' and 'show compile-args'.  */
 460 static char *compile_args;
 461
 462 /* Parsed form of COMPILE_ARGS.  COMPILE_ARGS_ARGV is NULL terminated.  */
 463 static int compile_args_argc;
 464 static char **compile_args_argv;
 465
 466 /* Implement 'set compile-args'.  */
 467
 468 static void
 469 set_compile_args (const char *args, int from_tty, struct cmd_list_element *c)
 470 {
 471   freeargv (compile_args_argv);
 472   build_argc_argv (compile_args, &compile_args_argc, &compile_args_argv);
 473 }
 474
 475 /* Implement 'show compile-args'.  */
 476
 477 static void
 478 show_compile_args (struct ui_file *file, int from_tty,
 479                    struct cmd_list_element *c, const char *value)
 480 {
 481   fprintf_filtered (file, _("Compile command command-line arguments "
 482                             "are \"%s\".\n"),
 483                     value);
 484 }
 485
 486 /* Append ARGC and ARGV (as parsed by build_argc_argv) to *ARGCP and *ARGVP.
 487    ARGCP+ARGVP can be zero+NULL and also ARGC+ARGV can be zero+NULL.  */
 488
 489 static void
 490 append_args (int *argcp, char ***argvp, int argc, char **argv)
 491 {
 492   int argi;
 493
 494   *argvp = XRESIZEVEC (char *, *argvp, (*argcp + argc + 1));
 495
 496   for (argi = 0; argi < argc; argi++)
 497     (*argvp)[(*argcp)++] = xstrdup (argv[argi]);
 498   (*argvp)[(*argcp)] = NULL;
 499 }
 500
 501 /* String for 'set compile-gcc' and 'show compile-gcc'.  */
 502 static char *compile_gcc;
 503
 504 /* Implement 'show compile-gcc'.  */
 505
 506 static void
 507 show_compile_gcc (struct ui_file *file, int from_tty,
 508                   struct cmd_list_element *c, const char *value)
 509 {
 510   fprintf_filtered (file, _("Compile command GCC driver filename is \"%s\".\n"),
 511                     value);
 512 }
 513
 514 /* Return DW_AT_producer parsed for get_selected_frame () (if any).
 515    Return NULL otherwise.
 516
 517    GCC already filters its command-line arguments only for the suitable ones to
 518    put into DW_AT_producer - see GCC function gen_producer_string.  */
 519
 520 static const char *
 521 get_selected_pc_producer_options (void)
 522 {
 523   CORE_ADDR pc = get_frame_pc (get_selected_frame (NULL));
 524   struct compunit_symtab *symtab = find_pc_compunit_symtab (pc);
 525   const char *cs;
 526
 527   if (symtab == NULL || symtab->producer == NULL
 528       || !startswith (symtab->producer, "GNU "))
 529     return NULL;
 530
 531   cs = symtab->producer;
 532   while (*cs != 0 && *cs != '-')
 533     cs = skip_spaces (skip_to_space (cs));
 534   if (*cs != '-')
 535     return NULL;
 536   return cs;
 537 }
 538
 539 /* Filter out unwanted options from *ARGCP and ARGV.  */
 540
 541 static void
 542 filter_args (int *argcp, char **argv)
 543 {
 544   char **destv;
 545
 546   for (destv = argv; *argv != NULL; argv++)
 547     {
 548       /* -fpreprocessed may get in commonly from ccache.  */
 549       if (strcmp (*argv, "-fpreprocessed") == 0)
 550         {
 551           xfree (*argv);
 552           (*argcp)--;
 553           continue;
 554         }
 555       *destv++ = *argv;
 556     }
 557   *destv = NULL;
 558 }
 559
 560 /* Produce final vector of GCC compilation options.
 561
 562    The first element of the combined argument vector are arguments
 563    relating to the target size ("-m64", "-m32" etc.).  These are
 564    sourced from the inferior's architecture.
 565
 566    The second element of the combined argument vector are arguments
 567    stored in the inferior DW_AT_producer section.  If these are stored
 568    in the inferior (there is no guarantee that they are), they are
 569    added to the vector.
 570
 571    The third element of the combined argument vector are argument
 572    supplied by the language implementation provided by
 573    compile-{lang}-support.  These contain language specific arguments.
 574
 575    The final element of the combined argument vector are arguments
 576    supplied by the "set compile-args" command.  These are always
 577    appended last so as to override any of the arguments automatically
 578    generated above.  */
 579
 580 static void
 581 get_args (const compile_instance *compiler, struct gdbarch *gdbarch,
 582           int *argcp, char ***argvp)
 583 {
 584   const char *cs_producer_options;
 585   int argc_compiler;
 586   char **argv_compiler;
 587
 588   build_argc_argv (gdbarch_gcc_target_options (gdbarch),
 589                    argcp, argvp);
 590
 591   cs_producer_options = get_selected_pc_producer_options ();
 592   if (cs_producer_options != NULL)
 593     {
 594       int argc_producer;
 595       char **argv_producer;
 596
 597       build_argc_argv (cs_producer_options, &argc_producer, &argv_producer);
 598       filter_args (&argc_producer, argv_producer);
 599       append_args (argcp, argvp, argc_producer, argv_producer);
 600       freeargv (argv_producer);
 601     }
 602
 603   build_argc_argv (compiler->gcc_target_options ().c_str (),
 604                    &argc_compiler, &argv_compiler);
 605   append_args (argcp, argvp, argc_compiler, argv_compiler);
 606   freeargv (argv_compiler);
 607
 608   append_args (argcp, argvp, compile_args_argc, compile_args_argv);
 609 }
 610
 611 /* A helper function suitable for use as the "print_callback" in the
 612    compiler object.  */
 613
 614 static void
 615 print_callback (void *ignore, const char *message)
 616 {
 617   fputs_filtered (message, gdb_stderr);
 618 }
 619
 620 /* Process the compilation request.  On success it returns the object
 621    and source file names.  On an error condition, error () is
 622    called.  */
 623
 624 static compile_file_names
 625 compile_to_object (struct command_line *cmd, const char *cmd_string,
 626                    enum compile_i_scope_types scope)
 627 {
 628   const struct block *expr_block;
 629   CORE_ADDR trash_pc, expr_pc;
 630   int argc;
 631   char **argv;
 632   int ok;
 633   struct gdbarch *gdbarch = get_current_arch ();
 634   std::string triplet_rx;
 635
 636   if (!target_has_execution)
 637     error (_("The program must be running for the compile command to "\
 638              "work."));
 639
 640   expr_block = get_expr_block_and_pc (&trash_pc);
 641   expr_pc = get_frame_address_in_block (get_selected_frame (NULL));
 642
 643   /* Set up instance and context for the compiler.  */
 644   if (current_language->la_get_compile_instance == NULL)
 645     error (_("No compiler support for language %s."),
 646            current_language->la_name);
 647
 648   compile_instance *compiler_instance
 649     = current_language->la_get_compile_instance ();
 650   std::unique_ptr<compile_instance> compiler (compiler_instance);
 651   compiler->set_print_callback (print_callback, NULL);
 652   compiler->set_scope (scope);
 653   compiler->set_block (expr_block);
 654
 655   /* From the provided expression, build a scope to pass to the
 656      compiler.  */
 657
 658   string_file input_buf;
 659   const char *input;
 660
 661   if (cmd != NULL)
 662     {
 663       struct command_line *iter;
 664
 665       for (iter = cmd->body_list_0.get (); iter; iter = iter->next)
 666         {
 667           input_buf.puts (iter->line);
 668           input_buf.puts ("\n");
 669         }
 670
 671       input = input_buf.c_str ();
 672     }
 673   else if (cmd_string != NULL)
 674     input = cmd_string;
 675   else
 676     error (_("Neither a simple expression, or a multi-line specified."));
 677
 678   std::string code
 679     = current_language->la_compute_program (compiler.get (), input, gdbarch,
 680                                             expr_block, expr_pc);
 681   if (compile_debug)
 682     fprintf_unfiltered (gdb_stdlog, "debug output:\n\n%s", code.c_str ());
 683
 684   compiler->set_verbose (compile_debug);
 685
 686   if (compile_gcc[0] != 0)
 687     {
 688       if (compiler->version () < GCC_FE_VERSION_1)
 689         error (_("Command 'set compile-gcc' requires GCC version 6 or higher "
 690                  "(libcc1 interface version 1 or higher)"));
 691
 692       compiler->set_driver_filename (compile_gcc);
 693     }
 694   else
 695     {
 696       const char *os_rx = osabi_triplet_regexp (gdbarch_osabi (gdbarch));
 697       const char *arch_rx = gdbarch_gnu_triplet_regexp (gdbarch);
 698
 699       /* Allow triplets with or without vendor set.  */
 700       triplet_rx = std::string (arch_rx) + "(-[^-]*)?-" + os_rx;
 701       compiler->set_triplet_regexp (triplet_rx.c_str ());
 702     }
 703
 704   /* Set compiler command-line arguments.  */
 705   get_args (compiler.get (), gdbarch, &argc, &argv);
 706   gdb_argv argv_holder (argv);
 707
 708   gdb::unique_xmalloc_ptr<char> error_message;
 709   error_message.reset (compiler->set_arguments (argc, argv,
 710                                                 triplet_rx.c_str ()));
 711
 712   if (error_message != NULL)
 713     error ("%s", error_message.get ());
 714
 715   if (compile_debug)
 716     {
 717       int argi;
 718
 719       fprintf_unfiltered (gdb_stdlog, "Passing %d compiler options:\n", argc);
 720       for (argi = 0; argi < argc; argi++)
 721         fprintf_unfiltered (gdb_stdlog, "Compiler option %d: <%s>\n",
 722                             argi, argv[argi]);
 723     }
 724
 725   compile_file_names fnames = get_new_file_names ();
 726
 727   gdb::optional<gdb::unlinker> source_remover;
 728
 729   {
 730     gdb_file_up src = gdb_fopen_cloexec (fnames.source_file (), "w");
 731     if (src == NULL)
 732       perror_with_name (_("Could not open source file for writing"));
 733
 734     source_remover.emplace (fnames.source_file ());
 735
 736     if (fputs (code.c_str (), src.get ()) == EOF)
 737       perror_with_name (_("Could not write to source file"));
 738   }
 739
 740   if (compile_debug)
 741     fprintf_unfiltered (gdb_stdlog, "source file produced: %s\n\n",
 742                         fnames.source_file ());
 743
 744   /* Call the compiler and start the compilation process.  */
 745   compiler->set_source_file (fnames.source_file ());
 746   ok = compiler->compile (fnames.object_file (), compile_debug);
 747   if (!ok)
 748     error (_("Compilation failed."));
 749
 750   if (compile_debug)
 751     fprintf_unfiltered (gdb_stdlog, "object file produced: %s\n\n",
 752                         fnames.object_file ());
 753
 754   /* Keep the source file.  */
 755   source_remover->keep ();
 756   return fnames;
 757 }
 758
 759 /* The "compile" prefix command.  */
 760
 761 static void
 762 compile_command (const char *args, int from_tty)
 763 {
 764   /* If a sub-command is not specified to the compile prefix command,
 765      assume it is a direct code compilation.  */
 766   compile_code_command (args, from_tty);
 767 }
 768
 769 /* See compile.h.  */
 770
 771 void
 772 eval_compile_command (struct command_line *cmd, const char *cmd_string,
 773                       enum compile_i_scope_types scope, void *scope_data)
 774 {
 775   struct compile_module *compile_module;
 776
 777   compile_file_names fnames = compile_to_object (cmd, cmd_string, scope);
 778
 779   gdb::unlinker object_remover (fnames.object_file ());
 780   gdb::unlinker source_remover (fnames.source_file ());
 781
 782   compile_module = compile_object_load (fnames, scope, scope_data);
 783   if (compile_module == NULL)
 784     {
 785       gdb_assert (scope == COMPILE_I_PRINT_ADDRESS_SCOPE);
 786       eval_compile_command (cmd, cmd_string,
 787                             COMPILE_I_PRINT_VALUE_SCOPE, scope_data);
 788       return;
 789     }
 790
 791   /* Keep the files.  */
 792   source_remover.keep ();
 793   object_remover.keep ();
 794
 795   compile_object_run (compile_module);
 796 }
 797
 798 /* See compile/compile-internal.h.  */
 799
 800 std::string
 801 compile_register_name_mangled (struct gdbarch *gdbarch, int regnum)
 802 {
 803   const char *regname = gdbarch_register_name (gdbarch, regnum);
 804
 805   return string_printf ("__%s", regname);
 806 }
 807
 808 /* See compile/compile-internal.h.  */
 809
 810 int
 811 compile_register_name_demangle (struct gdbarch *gdbarch,
 812                                  const char *regname)
 813 {
 814   int regnum;
 815
 816   if (regname[0] != '_' || regname[1] != '_')
 817     error (_("Invalid register name \"%s\"."), regname);
 818   regname += 2;
 819
 820   for (regnum = 0; regnum < gdbarch_num_regs (gdbarch); regnum++)
 821     if (strcmp (regname, gdbarch_register_name (gdbarch, regnum)) == 0)
 822       return regnum;
 823
 824   error (_("Cannot find gdbarch register \"%s\"."), regname);
 825 }
 826
 827 /* Forwards to the plug-in.  */
 828
 829 #define FORWARD(OP,...) (m_gcc_fe->ops->OP (m_gcc_fe, ##__VA_ARGS__))
 830
 831 /* See compile-internal.h.  */
 832
 833 void
 834 compile_instance::set_print_callback
 835   (void (*print_function) (void *, const char *), void *datum)
 836 {
 837   FORWARD (set_print_callback, print_function, datum);
 838 }
 839
 840 /* See compile-internal.h.  */
 841
 842 unsigned int
 843 compile_instance::version () const
 844 {
 845   return m_gcc_fe->ops->version;
 846 }
 847
 848 /* See compile-internal.h.  */
 849
 850 void
 851 compile_instance::set_verbose (int level)
 852 {
 853   if (version () >= GCC_FE_VERSION_1)
 854     FORWARD (set_verbose, level);
 855 }
 856
 857 /* See compile-internal.h.  */
 858
 859 void
 860 compile_instance::set_driver_filename (const char *filename)
 861 {
 862   if (version () >= GCC_FE_VERSION_1)
 863     FORWARD (set_driver_filename, filename);
 864 }
 865
 866 /* See compile-internal.h.  */
 867
 868 void
 869 compile_instance::set_triplet_regexp (const char *regexp)
 870 {
 871   if (version () >= GCC_FE_VERSION_1)
 872     FORWARD (set_triplet_regexp, regexp);
 873 }
 874
 875 /* See compile-internal.h.  */
 876
 877 char *
 878 compile_instance::set_arguments (int argc, char **argv, const char *regexp)
 879 {
 880   if (version () >= GCC_FE_VERSION_1)
 881     return FORWARD (set_arguments, argc, argv);
 882   else
 883     return FORWARD (set_arguments_v0, regexp, argc, argv);
 884 }
 885
 886 /* See compile-internal.h.  */
 887
 888 void
 889 compile_instance::set_source_file (const char *filename)
 890 {
 891   FORWARD (set_source_file, filename);
 892 }
 893
 894 /* See compile-internal.h.  */
 895
 896 bool
 897 compile_instance::compile (const char *filename, int verbose_level)
 898 {
 899   if (version () >= GCC_FE_VERSION_1)
 900     return FORWARD (compile, filename);
 901   else
 902     return FORWARD (compile_v0, filename, verbose_level);
 903 }
 904
 905 #undef FORWARD
 906
 907 /* See compile.h.  */
 908 cmd_list_element *compile_cmd_element = nullptr;
 909
 910 void
 911 _initialize_compile (void)
 912 {
 913   struct cmd_list_element *c = NULL;
 914
 915   compile_cmd_element = add_prefix_cmd ("compile", class_obscure,
 916                                         compile_command, _("\
 917 Command to compile source code and inject it into the inferior."),
 918                   &compile_command_list, "compile ", 1, &cmdlist);
 919   add_com_alias ("expression", "compile", class_obscure, 0);
 920
 921   add_cmd ("code", class_obscure, compile_code_command,
 922            _("\
 923 Compile, inject, and execute code.\n\
 924 \n\
 925 Usage: compile code [-r|-raw] [--] [CODE]\n\
 926 -r|-raw: Suppress automatic 'void _gdb_expr () { CODE }' wrapping.\n\
 927 --: Do not parse any options beyond this delimiter.  All text to the\n\
 928     right will be treated as source code.\n\
 929 \n\
 930 The source code may be specified as a simple one line expression, e.g.:\n\
 931 \n\
 932     compile code printf(\"Hello world\\n\");\n\
 933 \n\
 934 Alternatively, you can type a multiline expression by invoking\n\
 935 this command with no argument.  GDB will then prompt for the\n\
 936 expression interactively; type a line containing \"end\" to\n\
 937 indicate the end of the expression."),
 938            &compile_command_list);
 939
 940   c = add_cmd ("file", class_obscure, compile_file_command,
 941                _("\
 942 Evaluate a file containing source code.\n\
 943 \n\
 944 Usage: compile file [-r|-raw] [FILENAME]\n\
 945 -r|-raw: Suppress automatic 'void _gdb_expr () { CODE }' wrapping."),
 946                &compile_command_list);
 947   set_cmd_completer (c, filename_completer);
 948
 949   add_cmd ("print", class_obscure, compile_print_command,
 950            _("\
 951 Evaluate EXPR by using the compiler and print result.\n\
 952 \n\
 953 Usage: compile print[/FMT] [EXPR]\n\
 954 \n\
 955 The expression may be specified on the same line as the command, e.g.:\n\
 956 \n\
 957     compile print i\n\
 958 \n\
 959 Alternatively, you can type a multiline expression by invoking\n\
 960 this command with no argument.  GDB will then prompt for the\n\
 961 expression interactively; type a line containing \"end\" to\n\
 962 indicate the end of the expression.\n\
 963 \n\
 964 EXPR may be preceded with /FMT, where FMT is a format letter\n\
 965 but no count or size letter (see \"x\" command)."),
 966            &compile_command_list);
 967
 968   add_setshow_boolean_cmd ("compile", class_maintenance, &compile_debug, _("\
 969 Set compile command debugging."), _("\
 970 Show compile command debugging."), _("\
 971 When on, compile command debugging is enabled."),
 972                            NULL, show_compile_debug,
 973                            &setdebuglist, &showdebuglist);
 974
 975   add_setshow_string_cmd ("compile-args", class_support,
 976                           &compile_args,
 977                           _("Set compile command GCC command-line arguments"),
 978                           _("Show compile command GCC command-line arguments"),
 979                           _("\
 980 Use options like -I (include file directory) or ABI settings.\n\
 981 String quoting is parsed like in shell, for example:\n\
 982   -mno-align-double \"-I/dir with a space/include\""),
 983                           set_compile_args, show_compile_args, &setlist, &showlist);
 984
 985   /* Override flags possibly coming from DW_AT_producer.  */
 986   compile_args = xstrdup ("-O0 -gdwarf-4"
 987   /* We use -fPIE Otherwise GDB would need to reserve space large enough for
 988      any object file in the inferior in advance to get the final address when
 989      to link the object file to and additionally the default system linker
 990      script would need to be modified so that one can specify there the
 991      absolute target address.
 992      -fPIC is not used at is would require from GDB to generate .got.  */
 993                          " -fPIE"
 994   /* We want warnings, except for some commonly happening for GDB commands.  */
 995                          " -Wall "
 996                          " -Wno-unused-but-set-variable"
 997                          " -Wno-unused-variable"
 998   /* Override CU's possible -fstack-protector-strong.  */
 999                          " -fno-stack-protector"
1000   );
1001   set_compile_args (compile_args, 0, NULL);
1002
1003   add_setshow_optional_filename_cmd ("compile-gcc", class_support,
1004                                      &compile_gcc,
1005                                      _("Set compile command "
1006                                        "GCC driver filename"),
1007                                      _("Show compile command "
1008                                        "GCC driver filename"),
1009                                      _("\
1010 It should be absolute filename of the gcc executable.\n\
1011 If empty the default target triplet will be searched in $PATH."),
1012                                      NULL, show_compile_gcc, &setlist,
1013                                      &showlist);
1014   compile_gcc = xstrdup ("");
1015 }