GCC 初始化前端环境general_init

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本文详细介绍了GCC编译器前端环境的初始化过程，包括信号处理、国际化设置、诊断报告系统的初始化等关键步骤，并阐述了垃圾回收机制、字符串池及树类型哈希表的初始化等内容。

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/* Initialization of the front end environment, before command line
   options are parsed.  Signal handlers, internationalization etc.
   ARGV0 is main's argv[0].  */
static void general_init (const char *argv0, bool init_signals)
{
  const char *p;

  p = argv0 + strlen (argv0);
  while (p != argv0 && !IS_DIR_SEPARATOR (p[-1]))
    --p;
  progname = p;
  xmalloc_set_program_name (progname);
  hex_init ();
  /* Unlock the stdio streams.  */
  unlock_std_streams ();
  gcc_init_libintl ();
  identifier_to_locale_alloc = alloc_for_identifier_to_locale;
  identifier_to_locale_free = ggc_free;
  /* Initialize the diagnostics reporting machinery, so option parsing
     can give warnings and errors.  */
  diagnostic_initialize (global_dc, N_OPTS);
  /* Set a default printer.  Language specific initializations will
     override it later.  */
  tree_diagnostics_defaults (global_dc);
  global_dc->show_caret
    = global_options_init.x_flag_diagnostics_show_caret;
  global_dc->show_option_requested
    = global_options_init.x_flag_diagnostics_show_option;
  global_dc->show_column
    = global_options_init.x_flag_show_column;
  global_dc->internal_error = plugins_internal_error_function;
  global_dc->option_enabled = option_enabled;
  global_dc->option_state = &global_options;
  global_dc->option_name = option_name;
  if (init_signals)
    {
      /* Trap fatal signals, e.g. SIGSEGV, and convert them to ICE messages.  */
#ifdef SIGSEGV
      signal (SIGSEGV, crash_signal);
#endif
#ifdef SIGILL
      signal (SIGILL, crash_signal);
#endif
#ifdef SIGBUS
      signal (SIGBUS, crash_signal);
#endif
#ifdef SIGABRT
      signal (SIGABRT, crash_signal);
#endif
#if defined SIGIOT && (!defined SIGABRT || SIGABRT != SIGIOT)
      signal (SIGIOT, crash_signal);
#endif
#ifdef SIGFPE
      signal (SIGFPE, crash_signal);
#endif
      /* Other host-specific signal setup.  */
      (*host_hooks.extra_signals)();
  }
  /* Initialize the garbage-collector, string pools and tree type hash
     table.  */
  init_ggc ();
  init_stringpool ();
  input_location = UNKNOWN_LOCATION;
  line_table = ggc_alloc<line_maps> ();
  linemap_init (line_table, BUILTINS_LOCATION);
  line_table->reallocator = realloc_for_line_map;
  line_table->round_alloc_size = ggc_round_alloc_size;
  line_table->default_range_bits = 5;
  init_ttree ();
  /* Initialize register usage now so switches may override.  */
  init_reg_sets ();
  /* Register the language-independent parameters.  */
  global_init_params ();
  /* This must be done after global_init_params but before argument
     processing.  */
  init_ggc_heuristics ();
  /* Create the singleton holder for global state.
     Doing so also creates the pass manager and with it the passes.  */
  g = new gcc::context ();
  symtab = new (ggc_cleared_alloc <symbol_table> ()) symbol_table ();
  statistics_early_init ();
  finish_params ();
}