igen.c

这个是LINUX下的GDB调度工具的源码

    case generate_calls:
      {
	gen_list *entry;
	for (entry = gen->tables; entry != NULL; entry = entry->next)
	  {
	    print_idecode_lookups (file, entry->table, cache_rules);

	    /* output the main idecode routine */
	    if (!options.gen.icache)
	      {
		print_idecode_issue_function_header (file,
						     (options.gen.multi_sim
						      ? entry->model->name
						      : NULL),
						     1 /*is definition */ ,
						     1 /*ALWAYS ONE WORD */ );
		lf_printf (file, "{\n");
		lf_indent (file, +2);
		lf_printf (file, "%sinstruction_address nia;\n",
			   options.module.global.prefix.l);
		print_idecode_body (file, entry->table, "nia =");
		lf_printf (file, "return nia;");
		lf_indent (file, -2);
		lf_printf (file, "}\n");
	      }
	  }
	break;
      }
    case generate_jumps:
      {
	lf_print__this_file_is_empty (file, "generating a jump engine");
	break;
      }
    }
}


/****************************************************************/


static void
gen_run_c (lf *file, gen_table *gen)
{
  gen_list *entry;
  lf_printf (file, "#include \"sim-main.h\"\n");
  lf_printf (file, "#include \"engine.h\"\n");
  lf_printf (file, "#include \"idecode.h\"\n");
  lf_printf (file, "#include \"bfd.h\"\n");
  lf_printf (file, "\n");

  if (options.gen.multi_sim)
    {
      print_idecode_issue_function_header (file, NULL, is_function_variable,
					   1);
      lf_printf (file, "\n");
      print_engine_run_function_header (file, NULL, is_function_variable);
      lf_printf (file, "\n");
    }

  lf_printf (file, "void\n");
  lf_printf (file, "sim_engine_run (SIM_DESC sd,\n");
  lf_printf (file, "                int next_cpu_nr,\n");
  lf_printf (file, "                int nr_cpus,\n");
  lf_printf (file, "                int siggnal)\n");
  lf_printf (file, "{\n");
  lf_indent (file, +2);
  if (options.gen.multi_sim)
    {
      lf_printf (file, "int mach;\n");
      lf_printf (file, "if (STATE_ARCHITECTURE (sd) == NULL)\n");
      lf_printf (file, "  mach = 0;\n");
      lf_printf (file, "else\n");
      lf_printf (file, "  mach = STATE_ARCHITECTURE (sd)->mach;\n");
      lf_printf (file, "switch (mach)\n");
      lf_printf (file, "  {\n");
      lf_indent (file, +2);
      for (entry = gen->tables; entry != NULL; entry = entry->next)
	{
	  if (options.gen.default_model != NULL
	      && (strcmp (entry->model->name, options.gen.default_model) == 0
		  || strcmp (entry->model->full_name,
			     options.gen.default_model) == 0))
	    lf_printf (file, "default:\n");
	  lf_printf (file, "case bfd_mach_%s:\n", entry->model->full_name);
	  lf_indent (file, +2);
	  print_function_name (file, "issue", NULL,	/* format name */
			       NULL,	/* NO processor */
			       NULL,	/* expanded bits */
			       function_name_prefix_idecode);
	  lf_printf (file, " = ");
	  print_function_name (file, "issue", NULL,	/* format name */
			       entry->model->name, NULL,	/* expanded bits */
			       function_name_prefix_idecode);
	  lf_printf (file, ";\n");
	  print_function_name (file, "run", NULL,	/* format name */
			       NULL,	/* NO processor */
			       NULL,	/* expanded bits */
			       function_name_prefix_engine);
	  lf_printf (file, " = ");
	  print_function_name (file, "run", NULL,	/* format name */
			       entry->model->name, NULL,	/* expanded bits */
			       function_name_prefix_engine);
	  lf_printf (file, ";\n");
	  lf_printf (file, "break;\n");
	  lf_indent (file, -2);
	}
      if (options.gen.default_model == NULL)
	{
	  lf_printf (file, "default:\n");
	  lf_indent (file, +2);
	  lf_printf (file, "sim_engine_abort (sd, NULL, NULL_CIA,\n");
	  lf_printf (file,
		     "                  \"sim_engine_run - unknown machine\");\n");
	  lf_printf (file, "break;\n");
	  lf_indent (file, -2);
	}
      lf_indent (file, -2);
      lf_printf (file, "  }\n");
    }
  print_function_name (file, "run", NULL,	/* format name */
		       NULL,	/* NO processor */
		       NULL,	/* expanded bits */
		       function_name_prefix_engine);
  lf_printf (file, " (sd, next_cpu_nr, nr_cpus, siggnal);\n");
  lf_indent (file, -2);
  lf_printf (file, "}\n");
}

/****************************************************************/

static gen_table *
do_gen (insn_table *isa, decode_table *decode_rules)
{
  gen_table *gen;
  if (decode_rules == NULL)
    error (NULL, "Must specify a decode table\n");
  if (isa == NULL)
    error (NULL, "Must specify an instruction table\n");
  if (decode_table_max_word_nr (decode_rules) > 0)
    options.gen.multi_word = decode_table_max_word_nr (decode_rules);
  gen = make_gen_tables (isa, decode_rules);
  gen_tables_expand_insns (gen);
  gen_tables_expand_semantics (gen);
  return gen;
}

/****************************************************************/

igen_options options;

int
main (int argc, char **argv, char **envp)
{
  cache_entry *cache_rules = NULL;
  lf_file_references file_references = lf_include_references;
  decode_table *decode_rules = NULL;
  insn_table *isa = NULL;
  gen_table *gen = NULL;
  char *real_file_name = NULL;
  int is_header = 0;
  int ch;
  lf *standard_out =
    lf_open ("-", "stdout", lf_omit_references, lf_is_text, "igen");

  INIT_OPTIONS ();

  if (argc == 1)
    {
      printf ("Usage:\n");
      printf ("\n");
      printf ("  igen <config-opts> ... <input-opts>... <output-opts>...\n");
      printf ("\n");
      printf ("Config options:\n");
      printf ("\n");
      printf ("  -B <bit-size>\n");
      printf ("\t Set the number of bits in an instruction (deprecated).\n");
      printf
	("\t This option can now be set directly in the instruction table.\n");
      printf ("\n");
      printf ("  -D <data-structure>\n");
      printf
	("\t Dump the specified data structure to stdout. Valid structures include:\n");
      printf
	("\t processor-names - list the names of all the processors (models)\n");
      printf ("\n");
      printf ("  -F <filter-list>\n");
      printf
	("\t Filter out any instructions with a non-empty flags field that contains\n");
      printf ("\t a flag not listed in the <filter-list>.\n");
      printf ("\n");
      printf ("  -H <high-bit>\n");
      printf
	("\t Set the number of the high (most significant) instruction bit (deprecated).\n");
      printf
	("\t This option can now be set directly in the instruction table.\n");
      printf ("\n");
      printf ("  -I <directory>\n");
      printf
	("\t Add <directory> to the list of directories searched when opening a file\n");
      printf ("\n");
      printf ("  -M <model-list>\n");
      printf
	("\t Filter out any instructions that do not support at least one of the listed\n");
      printf
	("\t models (An instructions with no model information is considered to support\n");
      printf ("\t all models.).\n");
      printf ("\n");
      printf ("  -N <nr-cpus>\n");
      printf ("\t Generate a simulator supporting <nr-cpus>\n");
      printf
	("\t Specify `-N 0' to disable generation of the SMP. Specifying `-N 1' will\n");
      printf
	("\t still generate an SMP enabled simulator but will only support one CPU.\n");
      printf ("\n");
      printf ("  -T <mechanism>\n");
      printf
	("\t Override the decode mechanism specified by the decode rules\n");
      printf ("\n");
      printf ("  -P <prefix>\n");
      printf
	("\t Prepend global names (except itable) with the string <prefix>.\n");
      printf
	("\t Specify -P <module>=<prefix> to set a specific <module>'s prefix.\n");
      printf ("\n");
      printf ("  -S <suffix>\n");
      printf
	("\t Replace a global name (suffix) (except itable) with the string <suffix>.\n");
      printf
	("\t Specify -S <module>=<suffix> to change a specific <module>'s name (suffix).\n");
      printf ("\n");
      printf ("  -Werror\n");
      printf ("\t Make warnings errors\n");
      printf ("  -Wnodiscard\n");
      printf
	("\t Suppress warnings about discarded functions and instructions\n");
      printf ("  -Wnowidth\n");
      printf
	("\t Suppress warnings about instructions with invalid widths\n");
      printf ("  -Wnounimplemented\n");
      printf ("\t Suppress warnings about unimplemented instructions\n");
      printf ("\n");
      printf ("  -G [!]<gen-option>\n");
      printf ("\t Any of the following options:\n");
      printf ("\n");
      printf
	("\t decode-duplicate       - Override the decode rules, forcing the duplication of\n");
      printf ("\t                          semantic functions\n");
      printf
	("\t decode-combine         - Combine any duplicated entries within a table\n");
      printf
	("\t decode-zero-reserved   - Override the decode rules, forcing reserved bits to be\n");
      printf ("\t                          treated as zero.\n");
      printf
	("\t decode-switch-is-goto  - Overfide the padded-switch code type as a goto-switch\n");
      printf ("\n");
      printf
	("\t gen-conditional-issue  - conditionally issue each instruction\n");
      printf
	("\t gen-delayed-branch     - need both cia and nia passed around\n");
      printf
	("\t gen-direct-access      - use #defines to directly access values\n");
      printf
	("\t gen-zero-r<N>          - arch assumes GPR(<N>) == 0, keep it that way\n");
      printf
	("\t gen-icache[=<N>        - generate an instruction cracking cache of size <N>\n");
      printf ("\t                          Default size is %d\n",
	      options.gen.icache_size);
      printf
	("\t gen-insn-in-icache     - save original instruction when cracking\n");
      printf
	("\t gen-multi-sim[=MODEL]  - generate multiple simulators - one per model\n");
      printf
	("\t                          If specified MODEL is made the default architecture.\n");
      printf
	("\t                          By default, a single simulator that will\n");
      printf
	("\t                          execute any instruction is generated\n");
      printf
	("\t gen-multi-word         - generate code allowing for multi-word insns\n");
      printf
	("\t gen-semantic-icache    - include semantic code in cracking functions\n");
      printf
	("\t gen-slot-verification  - perform slot verification as part of decode\n");
      printf ("\t gen-nia-invalid        - NIA defaults to nia_invalid\n");
      printf ("\t gen-nia-void           - do not compute/return NIA\n");
      printf ("\n");
      printf
	("\t trace-combine          - report combined entries a rule application\n");
      printf
	("\t trace-entries          - report entries after a rules application\n");
      printf ("\t trace-rule-rejection   - report each rule as rejected\n");
      printf ("\t trace-rule-selection   - report each rule as selected\n");
      printf
	("\t trace-insn-insertion   - report each instruction as it is inserted into a decode table\n");
      printf
	("\t trace-rule-expansion   - report each instruction as it is expanded (before insertion into a decode table)\n");
      printf ("\t trace-all              - enable all trace options\n");
      printf ("\n");
      printf
	("\t field-widths           - instruction formats specify widths (deprecated)\n");
      printf
	("\t                          By default, an instruction format specifies bit\n");
      printf ("\t                          positions\n");
      printf
	("\t                          This option can now be set directly in the\n");
      printf ("\t                          instruction table\n");
      printf
	("\t jumps                  - use jumps instead of function calls\n");
      printf
	("\t omit-line-numbers      - do not include line number information in the output\n");
      printf ("\n");
      printf ("Input options:\n");
      printf ("\n");
      printf ("  -k <cache-rules> (deprecated)\n");
      printf ("  -o <decode-rules>\n");
      printf ("  -i <instruction-table>\n");
      printf ("\n");
      printf ("Output options:\n");
      printf ("\n");
      printf ("  -x                    Perform expansion (required)\n");
      printf
	("  -n <real-name>        Specify the real name of the next output file\n");
      printf
	("  -h 		       Generate the header (.h) file rather than the body (.c)\n");
      printf ("  -c <output-file>      output icache\n");
      printf ("  -d <output-file>      output idecode\n");
      printf ("  -e <output-file>      output engine\n");
      printf ("  -f <output-file>      output support functions\n");
      printf ("  -m <output-file>      output model\n");
      printf ("  -r <output-file>      output multi-sim run\n");
      printf ("  -s <output-file>      output schematic\n");
      printf ("  -t <output-file>      output itable\n");
    }

  while ((ch = getopt (argc, argv,
		       "B:D:F:G:H:I:M:N:P:T:W:o:k:i:n:hc:d:e:m:r:s:t:f:x"))
	 != -1)
    {
      fprintf (stderr, "  -%c ", ch);
      if (optarg)
	fprintf (stderr, "%s ", optarg);
      fprintf (stderr, "\\\n");

      switch (ch)
	{

	case 'M':
	  filter_parse (&options.model_filter, optarg);
	  break;

	case 'D':
	  if (strcmp (optarg, "processor-names"))
	    {
	      char *processor;
	      for (processor = filter_next (options.model_filter, "");
		   processor != NULL;
		   processor = filter_next (options.model_filter, processor))
		lf_printf (standard_out, "%s\n", processor);
	    }
	  else
	    error (NULL, "Unknown data structure %s, not dumped\n", optarg);
	  break;

	case 'F':
	  filter_parse (&options.flags_filter, optarg);
	  break;

	case 'I':
	  {
	    table_include **dir = &options.include;
	    while ((*dir) != NULL)
	      dir = &(*dir)->next;
	    (*dir) = ZALLOC (table_include);
	    (*dir)->dir = strdup (optarg);
	  }
	  break;

	case 'B':
	  options.insn_bit_size = a2i (optarg);
	  if (options.insn_bit_size <= 0
	      || options.insn_bit_size > max_insn_bit_size)
	    {
	      error (NULL, "Instruction bitsize must be in range 1..%d\n",
		     max_insn_bit_size);
	    }
	  if (options.hi_bit_nr != options.insn_bit_size - 1
	      && options.hi_bit_nr != 0)
	    {
	      error (NULL, "Conflict betweem hi-bit-nr and insn-bit-size\n");
	    }
	  break;

	case 'H':
	  options.hi_bit_nr = a2i (optarg);
	  if (options.hi_bit_nr != options.insn_bit_size - 1
	      && options.hi_bit_nr != 0)
	    {
	      error (NULL, "Conflict between hi-bit-nr and insn-bit-size\n");
	    }
	  break;

	case 'N':
	  options.gen.smp = a2i (optarg);
	  break;

	case 'P':
	case 'S':
	  {
	    igen_module *names;
	    igen_name *name;
	    char *chp;
	    chp = strchr (optarg, '=');
	    if (chp == NULL)
	      {
		names = &options.module.global;
		chp = optarg;
	      }