gdb/compile/compile.c

   1 /* General Compile and inject code
   2
   3    Copyright (C) 2014-2022 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 "cli/cli-option.h"
  27 #include "completer.h"
  28 #include "gdbcmd.h"
  29 #include "compile.h"
  30 #include "compile-internal.h"
  31 #include "compile-object-load.h"
  32 #include "compile-object-run.h"
  33 #include "language.h"
  34 #include "frame.h"
  35 #include "source.h"
  36 #include "block.h"
  37 #include "arch-utils.h"
  38 #include "gdbsupport/filestuff.h"
  39 #include "target.h"
  40 #include "osabi.h"
  41 #include "gdbsupport/gdb_wait.h"
  42 #include "valprint.h"
  43 #include "gdbsupport/gdb_optional.h"
  44 #include "gdbsupport/gdb_unlinker.h"
  45 #include "gdbsupport/pathstuff.h"
  46 #include "gdbsupport/scoped_ignore_signal.h"
  47 #include "gdbsupport/buildargv.h"
  48
  49 \f
  50
  51 /* Initial filename for temporary files.  */
  52
  53 #define TMP_PREFIX "/tmp/gdbobj-"
  54
  55 /* Hold "compile" commands.  */
  56
  57 static struct cmd_list_element *compile_command_list;
  58
  59 /* Debug flag for "compile" commands.  */
  60
  61 bool compile_debug;
  62
  63 /* Object of this type are stored in the compiler's symbol_err_map.  */
  64
  65 struct symbol_error
  66 {
  67   /* The symbol.  */
  68
  69   const struct symbol *sym;
  70
  71   /* The error message to emit.  This is malloc'd and owned by the
  72      hash table.  */
  73
  74   char *message;
  75 };
  76
  77 /* Hash a type_map_instance.  */
  78
  79 static hashval_t
  80 hash_type_map_instance (const void *p)
  81 {
  82   const struct type_map_instance *inst = (const struct type_map_instance *) p;
  83
  84   return htab_hash_pointer (inst->type);
  85 }
  86
  87 /* Check two type_map_instance objects for equality.  */
  88
  89 static int
  90 eq_type_map_instance (const void *a, const void *b)
  91 {
  92   const struct type_map_instance *insta = (const struct type_map_instance *) a;
  93   const struct type_map_instance *instb = (const struct type_map_instance *) b;
  94
  95   return insta->type == instb->type;
  96 }
  97
  98 /* Hash function for struct symbol_error.  */
  99
 100 static hashval_t
 101 hash_symbol_error (const void *a)
 102 {
 103   const struct symbol_error *se = (const struct symbol_error *) a;
 104
 105   return htab_hash_pointer (se->sym);
 106 }
 107
 108 /* Equality function for struct symbol_error.  */
 109
 110 static int
 111 eq_symbol_error (const void *a, const void *b)
 112 {
 113   const struct symbol_error *sea = (const struct symbol_error *) a;
 114   const struct symbol_error *seb = (const struct symbol_error *) b;
 115
 116   return sea->sym == seb->sym;
 117 }
 118
 119 /* Deletion function for struct symbol_error.  */
 120
 121 static void
 122 del_symbol_error (void *a)
 123 {
 124   struct symbol_error *se = (struct symbol_error *) a;
 125
 126   xfree (se->message);
 127   xfree (se);
 128 }
 129
 130 /* Constructor for compile_instance.  */
 131
 132 compile_instance::compile_instance (struct gcc_base_context *gcc_fe,
 133                                     const char *options)
 134   : m_gcc_fe (gcc_fe), m_gcc_target_options (options),
 135     m_type_map (htab_create_alloc (10, hash_type_map_instance,
 136                                    eq_type_map_instance,
 137                                    xfree, xcalloc, xfree)),
 138     m_symbol_err_map (htab_create_alloc (10, hash_symbol_error,
 139                                          eq_symbol_error, del_symbol_error,
 140                                          xcalloc, xfree))
 141 {
 142 }
 143
 144 /* See compile-internal.h.  */
 145
 146 bool
 147 compile_instance::get_cached_type (struct type *type, gcc_type *ret) const
 148 {
 149   struct type_map_instance inst, *found;
 150
 151   inst.type = type;
 152   found = (struct type_map_instance *) htab_find (m_type_map.get (), &inst);
 153   if (found != NULL)
 154     {
 155       *ret = found->gcc_type_handle;
 156       return true;
 157     }
 158
 159   return false;
 160 }
 161
 162 /* See compile-internal.h.  */
 163
 164 void
 165 compile_instance::insert_type (struct type *type, gcc_type gcc_type)
 166 {
 167   struct type_map_instance inst, *add;
 168   void **slot;
 169
 170   inst.type = type;
 171   inst.gcc_type_handle = gcc_type;
 172   slot = htab_find_slot (m_type_map.get (), &inst, INSERT);
 173
 174   add = (struct type_map_instance *) *slot;
 175   /* The type might have already been inserted in order to handle
 176      recursive types.  */
 177   if (add != NULL && add->gcc_type_handle != gcc_type)
 178     error (_("Unexpected type id from GCC, check you use recent enough GCC."));
 179
 180   if (add == NULL)
 181     {
 182       add = XNEW (struct type_map_instance);
 183       *add = inst;
 184       *slot = add;
 185     }
 186 }
 187
 188 /* See compile-internal.h.  */
 189
 190 void
 191 compile_instance::insert_symbol_error (const struct symbol *sym,
 192                                        const char *text)
 193 {
 194   struct symbol_error e;
 195   void **slot;
 196
 197   e.sym = sym;
 198   slot = htab_find_slot (m_symbol_err_map.get (), &e, INSERT);
 199   if (*slot == NULL)
 200     {
 201       struct symbol_error *ep = XNEW (struct symbol_error);
 202
 203       ep->sym = sym;
 204       ep->message = xstrdup (text);
 205       *slot = ep;
 206     }
 207 }
 208
 209 /* See compile-internal.h.  */
 210
 211 void
 212 compile_instance::error_symbol_once (const struct symbol *sym)
 213 {
 214   struct symbol_error search;
 215   struct symbol_error *err;
 216
 217   if (m_symbol_err_map == NULL)
 218     return;
 219
 220   search.sym = sym;
 221   err = (struct symbol_error *) htab_find (m_symbol_err_map.get (), &search);
 222   if (err == NULL || err->message == NULL)
 223     return;
 224
 225   gdb::unique_xmalloc_ptr<char> message (err->message);
 226   err->message = NULL;
 227   error (_("%s"), message.get ());
 228 }
 229
 230 /* Implement "show debug compile".  */
 231
 232 static void
 233 show_compile_debug (struct ui_file *file, int from_tty,
 234                     struct cmd_list_element *c, const char *value)
 235 {
 236   gdb_printf (file, _("Compile debugging is %s.\n"), value);
 237 }
 238
 239 \f
 240
 241 /* Options for the compile command.  */
 242
 243 struct compile_options
 244 {
 245   /* For -raw.  */
 246   bool raw = false;
 247 };
 248
 249 using compile_flag_option_def
 250   = gdb::option::flag_option_def<compile_options>;
 251
 252 static const gdb::option::option_def compile_command_option_defs[] = {
 253
 254   compile_flag_option_def {
 255     "raw",
 256     [] (compile_options *opts) { return &opts->raw; },
 257     N_("Suppress automatic 'void _gdb_expr () { CODE }' wrapping."),
 258   },
 259
 260 };
 261
 262 /* Create an option_def_group for the "compile" command's options,
 263    with OPTS as context.  */
 264
 265 static gdb::option::option_def_group
 266 make_compile_options_def_group (compile_options *opts)
 267 {
 268   return {{compile_command_option_defs}, opts};
 269 }
 270
 271 /* Handle the input from the 'compile file' command.  The "compile
 272    file" command is used to evaluate an expression contained in a file
 273    that may contain calls to the GCC compiler.  */
 274
 275 static void
 276 compile_file_command (const char *args, int from_tty)
 277 {
 278   scoped_restore save_async = make_scoped_restore (&current_ui->async, 0);
 279
 280   /* Check if a -raw option is provided.  */
 281
 282   compile_options options;
 283
 284   const gdb::option::option_def_group group
 285     = make_compile_options_def_group (&options);
 286   gdb::option::process_options
 287     (&args, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_ERROR,
 288      group);
 289
 290   enum compile_i_scope_types scope
 291     = options.raw ? COMPILE_I_RAW_SCOPE : COMPILE_I_SIMPLE_SCOPE;
 292
 293   args = skip_spaces (args);
 294
 295   /* After processing options, check whether we have a filename.  */
 296   if (args == nullptr || args[0] == '\0')
 297     error (_("You must provide a filename for this command."));
 298
 299   args = skip_spaces (args);
 300   gdb::unique_xmalloc_ptr<char> abspath = gdb_abspath (args);
 301   std::string buffer = string_printf ("#include \"%s\"\n", abspath.get ());
 302   eval_compile_command (NULL, buffer.c_str (), scope, NULL);
 303 }
 304
 305 /* Completer for the "compile file" command.  */
 306
 307 static void
 308 compile_file_command_completer (struct cmd_list_element *ignore,
 309                                 completion_tracker &tracker,
 310                                 const char *text, const char *word)
 311 {
 312   const gdb::option::option_def_group group
 313     = make_compile_options_def_group (nullptr);
 314   if (gdb::option::complete_options
 315       (tracker, &text, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_ERROR, group))
 316     return;
 317
 318   word = advance_to_filename_complete_word_point (tracker, text);
 319   filename_completer (ignore, tracker, text, word);
 320 }
 321
 322 /* Handle the input from the 'compile code' command.  The
 323    "compile code" command is used to evaluate an expression that may
 324    contain calls to the GCC compiler.  The language expected in this
 325    compile command is the language currently set in GDB.  */
 326
 327 static void
 328 compile_code_command (const char *args, int from_tty)
 329 {
 330   scoped_restore save_async = make_scoped_restore (&current_ui->async, 0);
 331
 332   compile_options options;
 333
 334   const gdb::option::option_def_group group
 335     = make_compile_options_def_group (&options);
 336   gdb::option::process_options
 337     (&args, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_ERROR, group);
 338
 339   enum compile_i_scope_types scope
 340     = options.raw ? COMPILE_I_RAW_SCOPE : COMPILE_I_SIMPLE_SCOPE;
 341
 342   if (args && *args)
 343     eval_compile_command (NULL, args, scope, NULL);
 344   else
 345     {
 346       counted_command_line l = get_command_line (compile_control, "");
 347
 348       l->control_u.compile.scope = scope;
 349       execute_control_command_untraced (l.get ());
 350     }
 351 }
 352
 353 /* Completer for the "compile code" command.  */
 354
 355 static void
 356 compile_code_command_completer (struct cmd_list_element *ignore,
 357                                 completion_tracker &tracker,
 358                                 const char *text, const char *word)
 359 {
 360   const gdb::option::option_def_group group
 361     = make_compile_options_def_group (nullptr);
 362   if (gdb::option::complete_options
 363       (tracker, &text, gdb::option::PROCESS_OPTIONS_UNKNOWN_IS_ERROR, group))
 364     return;
 365
 366   word = advance_to_expression_complete_word_point (tracker, text);
 367   symbol_completer (ignore, tracker, text, word);
 368 }
 369
 370 /* Callback for compile_print_command.  */
 371
 372 void
 373 compile_print_value (struct value *val, void *data_voidp)
 374 {
 375   const value_print_options *print_opts = (value_print_options *) data_voidp;
 376
 377   print_value (val, *print_opts);
 378 }
 379
 380 /* Handle the input from the 'compile print' command.  The "compile
 381    print" command is used to evaluate and print an expression that may
 382    contain calls to the GCC compiler.  The language expected in this
 383    compile command is the language currently set in GDB.  */
 384
 385 static void
 386 compile_print_command (const char *arg, int from_tty)
 387 {
 388   enum compile_i_scope_types scope = COMPILE_I_PRINT_ADDRESS_SCOPE;
 389   value_print_options print_opts;
 390
 391   scoped_restore save_async = make_scoped_restore (&current_ui->async, 0);
 392
 393   get_user_print_options (&print_opts);
 394   /* Override global settings with explicit options, if any.  */
 395   auto group = make_value_print_options_def_group (&print_opts);
 396   gdb::option::process_options
 397     (&arg, gdb::option::PROCESS_OPTIONS_REQUIRE_DELIMITER, group);
 398
 399   print_command_parse_format (&arg, "compile print", &print_opts);
 400
 401   /* Passing &PRINT_OPTS as SCOPE_DATA is safe as do_module_cleanup
 402      will not touch the stale pointer if compile_object_run has
 403      already quit.  */
 404
 405   if (arg && *arg)
 406     eval_compile_command (NULL, arg, scope, &print_opts);
 407   else
 408     {
 409       counted_command_line l = get_command_line (compile_control, "");
 410
 411       l->control_u.compile.scope = scope;
 412       l->control_u.compile.scope_data = &print_opts;
 413       execute_control_command_untraced (l.get ());
 414     }
 415 }
 416
 417 /* A cleanup function to remove a directory and all its contents.  */
 418
 419 static void
 420 do_rmdir (void *arg)
 421 {
 422   const char *dir = (const char *) arg;
 423   char *zap;
 424   int wstat;
 425
 426   gdb_assert (startswith (dir, TMP_PREFIX));
 427   zap = concat ("rm -rf ", dir, (char *) NULL);
 428   wstat = system (zap);
 429   if (wstat == -1 || !WIFEXITED (wstat) || WEXITSTATUS (wstat) != 0)
 430     warning (_("Could not remove temporary directory %s"), dir);
 431   XDELETEVEC (zap);
 432 }
 433
 434 /* Return the name of the temporary directory to use for .o files, and
 435    arrange for the directory to be removed at shutdown.  */
 436
 437 static const char *
 438 get_compile_file_tempdir (void)
 439 {
 440   static char *tempdir_name;
 441
 442 #define TEMPLATE TMP_PREFIX "XXXXXX"
 443   char tname[sizeof (TEMPLATE)];
 444
 445   if (tempdir_name != NULL)
 446     return tempdir_name;
 447
 448   strcpy (tname, TEMPLATE);
 449 #undef TEMPLATE
 450   tempdir_name = mkdtemp (tname);
 451   if (tempdir_name == NULL)
 452     perror_with_name (_("Could not make temporary directory"));
 453
 454   tempdir_name = xstrdup (tempdir_name);
 455   make_final_cleanup (do_rmdir, tempdir_name);
 456   return tempdir_name;
 457 }
 458
 459 /* Compute the names of source and object files to use.  */
 460
 461 static compile_file_names
 462 get_new_file_names ()
 463 {
 464   static int seq;
 465   const char *dir = get_compile_file_tempdir ();
 466
 467   ++seq;
 468
 469   return compile_file_names (string_printf ("%s%sout%d.c",
 470                                             dir, SLASH_STRING, seq),
 471                              string_printf ("%s%sout%d.o",
 472                                             dir, SLASH_STRING, seq));
 473 }
 474
 475 /* Get the block and PC at which to evaluate an expression.  */
 476
 477 static const struct block *
 478 get_expr_block_and_pc (CORE_ADDR *pc)
 479 {
 480   const struct block *block = get_selected_block (pc);
 481
 482   if (block == NULL)
 483     {
 484       struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 485
 486       if (cursal.symtab)
 487         block = BLOCKVECTOR_BLOCK (cursal.symtab->compunit ()->blockvector (),
 488                                    STATIC_BLOCK);
 489       if (block != NULL)
 490         *pc = BLOCK_ENTRY_PC (block);
 491     }
 492   else
 493     *pc = BLOCK_ENTRY_PC (block);
 494
 495   return block;
 496 }
 497
 498 /* String for 'set compile-args' and 'show compile-args'.  */
 499 static std::string compile_args =
 500   /* Override flags possibly coming from DW_AT_producer.  */
 501   "-O0 -gdwarf-4"
 502   /* We use -fPIE Otherwise GDB would need to reserve space large enough for
 503      any object file in the inferior in advance to get the final address when
 504      to link the object file to and additionally the default system linker
 505      script would need to be modified so that one can specify there the
 506      absolute target address.
 507      -fPIC is not used at is would require from GDB to generate .got.  */
 508   " -fPIE"
 509   /* We want warnings, except for some commonly happening for GDB commands.  */
 510   " -Wall "
 511   " -Wno-unused-but-set-variable"
 512   " -Wno-unused-variable"
 513   /* Override CU's possible -fstack-protector-strong.  */
 514   " -fno-stack-protector";
 515
 516 /* Parsed form of COMPILE_ARGS.  */
 517 static gdb_argv compile_args_argv;
 518
 519 /* Implement 'set compile-args'.  */
 520
 521 static void
 522 set_compile_args (const char *args, int from_tty, struct cmd_list_element *c)
 523 {
 524   compile_args_argv = gdb_argv (compile_args.c_str ());
 525 }
 526
 527 /* Implement 'show compile-args'.  */
 528
 529 static void
 530 show_compile_args (struct ui_file *file, int from_tty,
 531                    struct cmd_list_element *c, const char *value)
 532 {
 533   gdb_printf (file, _("Compile command command-line arguments "
 534                       "are \"%s\".\n"),
 535               value);
 536 }
 537
 538 /* String for 'set compile-gcc' and 'show compile-gcc'.  */
 539 static std::string compile_gcc;
 540
 541 /* Implement 'show compile-gcc'.  */
 542
 543 static void
 544 show_compile_gcc (struct ui_file *file, int from_tty,
 545                   struct cmd_list_element *c, const char *value)
 546 {
 547   gdb_printf (file, _("Compile command GCC driver filename is \"%s\".\n"),
 548               value);
 549 }
 550
 551 /* Return DW_AT_producer parsed for get_selected_frame () (if any).
 552    Return NULL otherwise.
 553
 554    GCC already filters its command-line arguments only for the suitable ones to
 555    put into DW_AT_producer - see GCC function gen_producer_string.  */
 556
 557 static const char *
 558 get_selected_pc_producer_options (void)
 559 {
 560   CORE_ADDR pc = get_frame_pc (get_selected_frame (NULL));
 561   struct compunit_symtab *symtab = find_pc_compunit_symtab (pc);
 562   const char *cs;
 563
 564   if (symtab == NULL || symtab->producer () == NULL
 565       || !startswith (symtab->producer (), "GNU "))
 566     return NULL;
 567
 568   cs = symtab->producer ();
 569   while (*cs != 0 && *cs != '-')
 570     cs = skip_spaces (skip_to_space (cs));
 571   if (*cs != '-')
 572     return NULL;
 573   return cs;
 574 }
 575
 576 /* Filter out unwanted options from ARGV.  */
 577
 578 static void
 579 filter_args (char **argv)
 580 {
 581   char **destv;
 582
 583   for (destv = argv; *argv != NULL; argv++)
 584     {
 585       /* -fpreprocessed may get in commonly from ccache.  */
 586       if (strcmp (*argv, "-fpreprocessed") == 0)
 587         {
 588           xfree (*argv);
 589           continue;
 590         }
 591       *destv++ = *argv;
 592     }
 593   *destv = NULL;
 594 }
 595
 596 /* Produce final vector of GCC compilation options.
 597
 598    The first element of the combined argument vector are arguments
 599    relating to the target size ("-m64", "-m32" etc.).  These are
 600    sourced from the inferior's architecture.
 601
 602    The second element of the combined argument vector are arguments
 603    stored in the inferior DW_AT_producer section.  If these are stored
 604    in the inferior (there is no guarantee that they are), they are
 605    added to the vector.
 606
 607    The third element of the combined argument vector are argument
 608    supplied by the language implementation provided by
 609    compile-{lang}-support.  These contain language specific arguments.
 610
 611    The final element of the combined argument vector are arguments
 612    supplied by the "set compile-args" command.  These are always
 613    appended last so as to override any of the arguments automatically
 614    generated above.  */
 615
 616 static gdb_argv
 617 get_args (const compile_instance *compiler, struct gdbarch *gdbarch)
 618 {
 619   const char *cs_producer_options;
 620   gdb_argv result;
 621
 622   std::string gcc_options = gdbarch_gcc_target_options (gdbarch);
 623
 624   /* Make sure we have a non-empty set of options, otherwise GCC will
 625      error out trying to look for a filename that is an empty string.  */
 626   if (!gcc_options.empty ())
 627     result = gdb_argv (gcc_options.c_str ());
 628
 629   cs_producer_options = get_selected_pc_producer_options ();
 630   if (cs_producer_options != NULL)
 631     {
 632       gdb_argv argv_producer (cs_producer_options);
 633       filter_args (argv_producer.get ());
 634
 635       result.append (std::move (argv_producer));
 636     }
 637
 638   result.append (gdb_argv (compiler->gcc_target_options ().c_str ()));
 639   result.append (compile_args_argv);
 640
 641   return result;
 642 }
 643
 644 /* A helper function suitable for use as the "print_callback" in the
 645    compiler object.  */
 646
 647 static void
 648 print_callback (void *ignore, const char *message)
 649 {
 650   gdb_puts (message, gdb_stderr);
 651 }
 652
 653 /* Process the compilation request.  On success it returns the object
 654    and source file names.  On an error condition, error () is
 655    called.  */
 656
 657 static compile_file_names
 658 compile_to_object (struct command_line *cmd, const char *cmd_string,
 659                    enum compile_i_scope_types scope)
 660 {
 661   const struct block *expr_block;
 662   CORE_ADDR trash_pc, expr_pc;
 663   int ok;
 664   struct gdbarch *gdbarch = get_current_arch ();
 665   std::string triplet_rx;
 666
 667   if (!target_has_execution ())
 668     error (_("The program must be running for the compile command to "\
 669              "work."));
 670
 671   expr_block = get_expr_block_and_pc (&trash_pc);
 672   expr_pc = get_frame_address_in_block (get_selected_frame (NULL));
 673
 674   /* Set up instance and context for the compiler.  */
 675   std::unique_ptr<compile_instance> compiler
 676     = current_language->get_compile_instance ();
 677   if (compiler == nullptr)
 678     error (_("No compiler support for language %s."),
 679            current_language->name ());
 680   compiler->set_print_callback (print_callback, NULL);
 681   compiler->set_scope (scope);
 682   compiler->set_block (expr_block);
 683
 684   /* From the provided expression, build a scope to pass to the
 685      compiler.  */
 686
 687   string_file input_buf;
 688   const char *input;
 689
 690   if (cmd != NULL)
 691     {
 692       struct command_line *iter;
 693
 694       for (iter = cmd->body_list_0.get (); iter; iter = iter->next)
 695         {
 696           input_buf.puts (iter->line);
 697           input_buf.puts ("\n");
 698         }
 699
 700       input = input_buf.c_str ();
 701     }
 702   else if (cmd_string != NULL)
 703     input = cmd_string;
 704   else
 705     error (_("Neither a simple expression, or a multi-line specified."));
 706
 707   std::string code
 708     = current_language->compute_program (compiler.get (), input, gdbarch,
 709                                          expr_block, expr_pc);
 710   if (compile_debug)
 711     gdb_printf (gdb_stdlog, "debug output:\n\n%s", code.c_str ());
 712
 713   compiler->set_verbose (compile_debug);
 714
 715   if (!compile_gcc.empty ())
 716     {
 717       if (compiler->version () < GCC_FE_VERSION_1)
 718         error (_("Command 'set compile-gcc' requires GCC version 6 or higher "
 719                  "(libcc1 interface version 1 or higher)"));
 720
 721       compiler->set_driver_filename (compile_gcc.c_str ());
 722     }
 723   else
 724     {
 725       const char *os_rx = osabi_triplet_regexp (gdbarch_osabi (gdbarch));
 726       const char *arch_rx = gdbarch_gnu_triplet_regexp (gdbarch);
 727
 728       /* Allow triplets with or without vendor set.  */
 729       triplet_rx = std::string (arch_rx) + "(-[^-]*)?-";
 730       if (os_rx != nullptr)
 731         triplet_rx += os_rx;
 732       compiler->set_triplet_regexp (triplet_rx.c_str ());
 733     }
 734
 735   /* Set compiler command-line arguments.  */
 736   gdb_argv argv_holder = get_args (compiler.get (), gdbarch);
 737   int argc = argv_holder.count ();
 738   char **argv = argv_holder.get ();
 739
 740   gdb::unique_xmalloc_ptr<char> error_message
 741     = compiler->set_arguments (argc, argv, triplet_rx.c_str ());
 742
 743   if (error_message != NULL)
 744     error ("%s", error_message.get ());
 745
 746   if (compile_debug)
 747     {
 748       int argi;
 749
 750       gdb_printf (gdb_stdlog, "Passing %d compiler options:\n", argc);
 751       for (argi = 0; argi < argc; argi++)
 752         gdb_printf (gdb_stdlog, "Compiler option %d: <%s>\n",
 753                     argi, argv[argi]);
 754     }
 755
 756   compile_file_names fnames = get_new_file_names ();
 757
 758   gdb::optional<gdb::unlinker> source_remover;
 759
 760   {
 761     gdb_file_up src = gdb_fopen_cloexec (fnames.source_file (), "w");
 762     if (src == NULL)
 763       perror_with_name (_("Could not open source file for writing"));
 764
 765     source_remover.emplace (fnames.source_file ());
 766
 767     if (fputs (code.c_str (), src.get ()) == EOF)
 768       perror_with_name (_("Could not write to source file"));
 769   }
 770
 771   if (compile_debug)
 772     gdb_printf (gdb_stdlog, "source file produced: %s\n\n",
 773                 fnames.source_file ());
 774
 775   /* If we don't do this, then GDB simply exits
 776      when the compiler dies.  */
 777   scoped_ignore_sigpipe ignore_sigpipe;
 778
 779   /* Call the compiler and start the compilation process.  */
 780   compiler->set_source_file (fnames.source_file ());
 781   ok = compiler->compile (fnames.object_file (), compile_debug);
 782   if (!ok)
 783     error (_("Compilation failed."));
 784
 785   if (compile_debug)
 786     gdb_printf (gdb_stdlog, "object file produced: %s\n\n",
 787                 fnames.object_file ());
 788
 789   /* Keep the source file.  */
 790   source_remover->keep ();
 791   return fnames;
 792 }
 793
 794 /* The "compile" prefix command.  */
 795
 796 static void
 797 compile_command (const char *args, int from_tty)
 798 {
 799   /* If a sub-command is not specified to the compile prefix command,
 800      assume it is a direct code compilation.  */
 801   compile_code_command (args, from_tty);
 802 }
 803
 804 /* See compile.h.  */
 805
 806 void
 807 eval_compile_command (struct command_line *cmd, const char *cmd_string,
 808                       enum compile_i_scope_types scope, void *scope_data)
 809 {
 810   compile_file_names fnames = compile_to_object (cmd, cmd_string, scope);
 811
 812   gdb::unlinker object_remover (fnames.object_file ());
 813   gdb::unlinker source_remover (fnames.source_file ());
 814
 815   compile_module_up compile_module = compile_object_load (fnames, scope,
 816                                                           scope_data);
 817   if (compile_module == NULL)
 818     {
 819       gdb_assert (scope == COMPILE_I_PRINT_ADDRESS_SCOPE);
 820       eval_compile_command (cmd, cmd_string,
 821                             COMPILE_I_PRINT_VALUE_SCOPE, scope_data);
 822       return;
 823     }
 824
 825   /* Keep the files.  */
 826   source_remover.keep ();
 827   object_remover.keep ();
 828
 829   compile_object_run (std::move (compile_module));
 830 }
 831
 832 /* See compile/compile-internal.h.  */
 833
 834 std::string
 835 compile_register_name_mangled (struct gdbarch *gdbarch, int regnum)
 836 {
 837   const char *regname = gdbarch_register_name (gdbarch, regnum);
 838
 839   return string_printf ("__%s", regname);
 840 }
 841
 842 /* See compile/compile-internal.h.  */
 843
 844 int
 845 compile_register_name_demangle (struct gdbarch *gdbarch,
 846                                  const char *regname)
 847 {
 848   int regnum;
 849
 850   if (regname[0] != '_' || regname[1] != '_')
 851     error (_("Invalid register name \"%s\"."), regname);
 852   regname += 2;
 853
 854   for (regnum = 0; regnum < gdbarch_num_regs (gdbarch); regnum++)
 855     if (strcmp (regname, gdbarch_register_name (gdbarch, regnum)) == 0)
 856       return regnum;
 857
 858   error (_("Cannot find gdbarch register \"%s\"."), regname);
 859 }
 860
 861 /* Forwards to the plug-in.  */
 862
 863 #define FORWARD(OP,...) (m_gcc_fe->ops->OP (m_gcc_fe, ##__VA_ARGS__))
 864
 865 /* See compile-internal.h.  */
 866
 867 void
 868 compile_instance::set_print_callback
 869   (void (*print_function) (void *, const char *), void *datum)
 870 {
 871   FORWARD (set_print_callback, print_function, datum);
 872 }
 873
 874 /* See compile-internal.h.  */
 875
 876 unsigned int
 877 compile_instance::version () const
 878 {
 879   return m_gcc_fe->ops->version;
 880 }
 881
 882 /* See compile-internal.h.  */
 883
 884 void
 885 compile_instance::set_verbose (int level)
 886 {
 887   if (version () >= GCC_FE_VERSION_1)
 888     FORWARD (set_verbose, level);
 889 }
 890
 891 /* See compile-internal.h.  */
 892
 893 void
 894 compile_instance::set_driver_filename (const char *filename)
 895 {
 896   if (version () >= GCC_FE_VERSION_1)
 897     FORWARD (set_driver_filename, filename);
 898 }
 899
 900 /* See compile-internal.h.  */
 901
 902 void
 903 compile_instance::set_triplet_regexp (const char *regexp)
 904 {
 905   if (version () >= GCC_FE_VERSION_1)
 906     FORWARD (set_triplet_regexp, regexp);
 907 }
 908
 909 /* See compile-internal.h.  */
 910
 911 gdb::unique_xmalloc_ptr<char>
 912 compile_instance::set_arguments (int argc, char **argv, const char *regexp)
 913 {
 914   if (version () >= GCC_FE_VERSION_1)
 915     return gdb::unique_xmalloc_ptr<char> (FORWARD (set_arguments, argc, argv));
 916   else
 917     return gdb::unique_xmalloc_ptr<char> (FORWARD (set_arguments_v0, regexp,
 918                                                    argc, argv));
 919 }
 920
 921 /* See compile-internal.h.  */
 922
 923 void
 924 compile_instance::set_source_file (const char *filename)
 925 {
 926   FORWARD (set_source_file, filename);
 927 }
 928
 929 /* See compile-internal.h.  */
 930
 931 bool
 932 compile_instance::compile (const char *filename, int verbose_level)
 933 {
 934   if (version () >= GCC_FE_VERSION_1)
 935     return FORWARD (compile, filename);
 936   else
 937     return FORWARD (compile_v0, filename, verbose_level);
 938 }
 939
 940 #undef FORWARD
 941
 942 /* See compile.h.  */
 943 cmd_list_element *compile_cmd_element = nullptr;
 944
 945 void _initialize_compile ();
 946 void
 947 _initialize_compile ()
 948 {
 949   struct cmd_list_element *c = NULL;
 950
 951   compile_cmd_element = add_prefix_cmd ("compile", class_obscure,
 952                                         compile_command, _("\
 953 Command to compile source code and inject it into the inferior."),
 954                   &compile_command_list, 1, &cmdlist);
 955   add_com_alias ("expression", compile_cmd_element, class_obscure, 0);
 956
 957   const auto compile_opts = make_compile_options_def_group (nullptr);
 958
 959   static const std::string compile_code_help
 960     = gdb::option::build_help (_("\
 961 Compile, inject, and execute code.\n\
 962 \n\
 963 Usage: compile code [OPTION]... [CODE]\n\
 964 \n\
 965 Options:\n\
 966 %OPTIONS%\n\
 967 \n\
 968 The source code may be specified as a simple one line expression, e.g.:\n\
 969 \n\
 970     compile code printf(\"Hello world\\n\");\n\
 971 \n\
 972 Alternatively, you can type a multiline expression by invoking\n\
 973 this command with no argument.  GDB will then prompt for the\n\
 974 expression interactively; type a line containing \"end\" to\n\
 975 indicate the end of the expression."),
 976                                compile_opts);
 977
 978   c = add_cmd ("code", class_obscure, compile_code_command,
 979                compile_code_help.c_str (),
 980                &compile_command_list);
 981   set_cmd_completer_handle_brkchars (c, compile_code_command_completer);
 982
 983 static const std::string compile_file_help
 984     = gdb::option::build_help (_("\
 985 Evaluate a file containing source code.\n\
 986 \n\
 987 Usage: compile file [OPTION].. [FILENAME]\n\
 988 \n\
 989 Options:\n\
 990 %OPTIONS%"),
 991                                compile_opts);
 992
 993   c = add_cmd ("file", class_obscure, compile_file_command,
 994                compile_file_help.c_str (),
 995                &compile_command_list);
 996   set_cmd_completer_handle_brkchars (c, compile_file_command_completer);
 997
 998   const auto compile_print_opts = make_value_print_options_def_group (nullptr);
 999
1000   static const std::string compile_print_help
1001     = gdb::option::build_help (_("\
1002 Evaluate EXPR by using the compiler and print result.\n\
1003 \n\
1004 Usage: compile print [[OPTION]... --] [/FMT] [EXPR]\n\
1005 \n\
1006 Options:\n\
1007 %OPTIONS%\n\
1008 \n\
1009 Note: because this command accepts arbitrary expressions, if you\n\
1010 specify any command option, you must use a double dash (\"--\")\n\
1011 to mark the end of option processing.  E.g.: \"compile print -o -- myobj\".\n\
1012 \n\
1013 The expression may be specified on the same line as the command, e.g.:\n\
1014 \n\
1015     compile print i\n\
1016 \n\
1017 Alternatively, you can type a multiline expression by invoking\n\
1018 this command with no argument.  GDB will then prompt for the\n\
1019 expression interactively; type a line containing \"end\" to\n\
1020 indicate the end of the expression.\n\
1021 \n\
1022 EXPR may be preceded with /FMT, where FMT is a format letter\n\
1023 but no count or size letter (see \"x\" command)."),
1024                                compile_print_opts);
1025
1026   c = add_cmd ("print", class_obscure, compile_print_command,
1027                compile_print_help.c_str (),
1028                &compile_command_list);
1029   set_cmd_completer_handle_brkchars (c, print_command_completer);
1030
1031   add_setshow_boolean_cmd ("compile", class_maintenance, &compile_debug, _("\
1032 Set compile command debugging."), _("\
1033 Show compile command debugging."), _("\
1034 When on, compile command debugging is enabled."),
1035                            NULL, show_compile_debug,
1036                            &setdebuglist, &showdebuglist);
1037
1038   add_setshow_string_cmd ("compile-args", class_support,
1039                           &compile_args,
1040                           _("Set compile command GCC command-line arguments."),
1041                           _("Show compile command GCC command-line arguments."),
1042                           _("\
1043 Use options like -I (include file directory) or ABI settings.\n\
1044 String quoting is parsed like in shell, for example:\n\
1045   -mno-align-double \"-I/dir with a space/include\""),
1046                           set_compile_args, show_compile_args, &setlist, &showlist);
1047
1048
1049   /* Initialize compile_args_argv.  */
1050   set_compile_args (compile_args.c_str (), 0, NULL);
1051
1052   add_setshow_optional_filename_cmd ("compile-gcc", class_support,
1053                                      &compile_gcc,
1054                                      _("Set compile command "
1055                                        "GCC driver filename."),
1056                                      _("Show compile command "
1057                                        "GCC driver filename."),
1058                                      _("\
1059 It should be absolute filename of the gcc executable.\n\
1060 If empty the default target triplet will be searched in $PATH."),
1061                                      NULL, show_compile_gcc, &setlist,
1062                                      &showlist);
1063 }