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/*  This file is part of the program psim.

    Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation; either version 2 of the License, or

    (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with this program; if not, write to the Free Software

    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

    */

#include "misc.h"

#include "lf.h"

#include "table.h"

#include "filter.h"

#include "ld-decode.h"

#include "ld-cache.h"

#include "ld-insn.h"

#include "igen.h"

#include "gen-semantics.h"

#include "gen-idecode.h"

#include "gen-icache.h"

static void

print_icache_function_header(lf *file,

                             const char *basename,

                             insn_bits *expanded_bits,

                             int is_function_definition)

{

  lf_printf(file, "\n");

  lf_print_function_type(file, ICACHE_FUNCTION_TYPE, "EXTERN_ICACHE", " ");

  print_function_name(file,

                      basename,

                      expanded_bits,

                      function_name_prefix_icache);

  lf_printf(file, "\n(%s)", ICACHE_FUNCTION_FORMAL);

  if (!is_function_definition)

    lf_printf(file, ";");

  lf_printf(file, "\n");

}

void

print_icache_declaration(insn_table *entry,

                         lf *file,

                         void *data,

                         insn *instruction,

                         int depth)

{

  if (generate_expanded_instructions) {

    ASSERT(entry->nr_insn == 1);

    print_icache_function_header(file,

                                 entry->insns->file_entry->fields[insn_name],

                                 entry->expanded_bits,

                                 0/* is not function definition */);

  }

  else {

    print_icache_function_header(file,

                                 instruction->file_entry->fields[insn_name],

                                 NULL,

                                 0/* is not function definition */);

  }

}

static void

print_icache_extraction(lf *file,

                        insn *instruction,

                        const char *entry_name,

                        const char *entry_type,

                        const char *entry_expression,

                        const char *original_name,

                        const char *file_name,

                        int line_nr,

                        insn_field *cur_field,

                        insn_bits *bits,

                        icache_decl_type what_to_declare,

                        icache_body_type what_to_do,

                        const char *reason)

{

  const char *expression;

  ASSERT(entry_name != NULL);

  /* Define a storage area for the cache element */

  if (what_to_declare == undef_variables) {

    /* We've finished with the value - destory it */

    lf_indent_suppress(file);

    lf_printf(file, "#undef %s\n", entry_name);

    return;

  }

  else if (what_to_declare == define_variables) {

    lf_indent_suppress(file);

    lf_printf(file, "#define %s ", entry_name);

  }

  else {

    if (file_name != NULL)

      lf_print__external_reference(file, line_nr, file_name);

    lf_printf(file, "%s const %s UNUSED = ",

              entry_type == NULL ? "unsigned" : entry_type,

              entry_name);

  }

  /* define a value for that storage area as determined by what is in

     the cache */

  if (bits != NULL

      && strcmp(entry_name, cur_field->val_string) == 0

      && ((bits->opcode->is_boolean && bits->value == 0)

          || (!bits->opcode->is_boolean))) {

    /* The simple field has been made constant (as a result of

       expanding instructions or similar).  Remember that for a

       boolean field, value is either 0 (implying the required

       boolean_constant) or nonzero (implying some other value and

       handled later below) - Define the variable accordingly */

    expression = "constant field";

    ASSERT(bits->field == cur_field);

    ASSERT(entry_type == NULL);

    if (bits->opcode->is_boolean)

      lf_printf(file, "%d", bits->opcode->boolean_constant);

    else if (bits->opcode->last < bits->field->last)

      lf_printf(file, "%d",

                bits->value << (bits->field->last - bits->opcode->last));

    else

      lf_printf(file, "%d", bits->value);

  }

  else if (bits != NULL

           && original_name != NULL

           && strncmp(entry_name,

                      original_name, strlen(original_name)) == 0

           && strncmp(entry_name + strlen(original_name),

                      "_is_", strlen("_is_")) == 0

           && ((bits->opcode->is_boolean

                && (atol(entry_name + strlen(original_name) + strlen("_is_"))

                    == bits->opcode->boolean_constant))

               || (!bits->opcode->is_boolean))) {

    expression = "constant compare";

    /* An entry, derived from ORIGINAL_NAME, is testing to see of the

       ORIGINAL_NAME has a specific constant value.  That value

       matching a boolean or constant field */

    if (bits->opcode->is_boolean)

      lf_printf(file, "%d /* %s == %d */",

                bits->value == 0,

                original_name,

                bits->opcode->boolean_constant);

    else if (bits->opcode->last < bits->field->last)

      lf_printf(file, "%d /* %s == %d */",

                (atol(entry_name + strlen(original_name) + strlen("_is_"))

                 == (bits->value << (bits->field->last - bits->opcode->last))),

                original_name,

                (bits->value << (bits->field->last - bits->opcode->last)));

    else

      lf_printf(file, "%d /* %s == %d */",

                (atol(entry_name + strlen(original_name) + strlen("_is_"))

                 == bits->value),

                original_name,

                bits->value);

  }

  else {

    /* put the field in the local variable, possibly also enter it

       into the cache */

    expression = "extraction";

    /* handle the cache */

    if ((what_to_do & get_values_from_icache)

        || (what_to_do & put_values_in_icache)) {

      lf_printf(file, "cache_entry->crack.%s.%s",

                instruction->file_entry->fields[insn_form],

                entry_name);

      if (what_to_do & put_values_in_icache) /* also put it in the cache? */

        lf_printf(file, " = ");

    }

    if ((what_to_do & put_values_in_icache)

        || what_to_do == do_not_use_icache) {

      if (cur_field != NULL && strcmp(entry_name, cur_field->val_string) == 0)

        lf_printf(file, "EXTRACTED32(instruction, %d, %d)",

                  i2target(hi_bit_nr, cur_field->first),

                  i2target(hi_bit_nr, cur_field->last));

      else if (entry_expression != NULL)

        lf_printf(file, "%s", entry_expression);

      else

        lf_printf(file, "eval_%s", entry_name);

    }

  }

  if (!((what_to_declare == define_variables)

        || (what_to_declare == undef_variables)))

    lf_printf(file, ";");

  if (reason != NULL)

    lf_printf(file, " /* %s - %s */", reason, expression);

  lf_printf(file, "\n");

}

void

print_icache_body(lf *file,

                  insn *instruction,

                  insn_bits *expanded_bits,

                  cache_table *cache_rules,

                  icache_decl_type what_to_declare,

                  icache_body_type what_to_do)

{

  insn_field *cur_field;

  /* extract instruction fields */

  lf_printf(file, "/* extraction: %s ",

            instruction->file_entry->fields[insn_format]);

  switch (what_to_declare) {

  case define_variables:

    lf_printf(file, "#define");

    break;

  case declare_variables:

    lf_printf(file, "declare");

    break;

  case undef_variables:

    lf_printf(file, "#undef");

    break;

  }

  lf_printf(file, " ");

  switch (what_to_do) {

  case get_values_from_icache:

    lf_printf(file, "get-values-from-icache");

    break;

  case put_values_in_icache:

    lf_printf(file, "put-values-in-icache");

    break;

  case both_values_and_icache:

    lf_printf(file, "get-values-from-icache|put-values-in-icache");

    break;

  case do_not_use_icache:

    lf_printf(file, "do-not-use-icache");

    break;

  }

  lf_printf(file, " */\n");

  for (cur_field = instruction->fields->first;

       cur_field->first < insn_bit_size;

       cur_field = cur_field->next) {

    if (cur_field->is_string) {

      insn_bits *bits;

      int found_rule = 0;

      /* find any corresponding value */

      for (bits = expanded_bits;

           bits != NULL;

           bits = bits->last) {

        if (bits->field == cur_field)

          break;

      }

      /* try the cache rule table for what to do */

      {

        cache_table *cache_rule;

        for (cache_rule = cache_rules;

             cache_rule != NULL;

             cache_rule = cache_rule->next) {

          if (strcmp(cur_field->val_string, cache_rule->field_name) == 0) {

            found_rule = 1;

            if (cache_rule->type == scratch_value

                && ((what_to_do & put_values_in_icache)

                    || what_to_do == do_not_use_icache))

              print_icache_extraction(file,

                                      instruction,

                                      cache_rule->derived_name,

                                      cache_rule->type_def,

                                      cache_rule->expression,

                                      cache_rule->field_name,

                                      cache_rule->file_entry->file_name,

                                      cache_rule->file_entry->line_nr,

                                      cur_field,

                                      bits,

                                      what_to_declare,

                                      do_not_use_icache,

                                      "icache scratch");

            else if (cache_rule->type == compute_value

                     && ((what_to_do & get_values_from_icache)

                         || what_to_do == do_not_use_icache))

              print_icache_extraction(file,

                                      instruction,

                                      cache_rule->derived_name,

                                      cache_rule->type_def,

                                      cache_rule->expression,

                                      cache_rule->field_name,

                                      cache_rule->file_entry->file_name,

                                      cache_rule->file_entry->line_nr,

                                      cur_field,

                                      bits,

                                      what_to_declare,

                                      do_not_use_icache,

                                      "semantic compute");

            else if (cache_rule->type == cache_value

                     && ((what_to_declare != undef_variables)

                         || !(what_to_do & put_values_in_icache)))

              print_icache_extraction(file,

                                      instruction,

                                      cache_rule->derived_name,

                                      cache_rule->type_def,

                                      cache_rule->expression,

                                      cache_rule->field_name,

                                      cache_rule->file_entry->file_name,

                                      cache_rule->file_entry->line_nr,

                                      cur_field,

                                      bits,

                                      ((what_to_do & put_values_in_icache)

                                       ? declare_variables

                                       : what_to_declare),

                                      what_to_do,

                                      "in icache");

          }

        }

      }

      /* No rule at all, assume that this is needed in the semantic

         function (when values are extracted from the icache) and

         hence must be put into the cache */

      if (found_rule == 0

          && ((what_to_declare != undef_variables)

              || !(what_to_do & put_values_in_icache)))

        print_icache_extraction(file,

                                instruction,

                                cur_field->val_string,

                                NULL, NULL, NULL, /* type, exp, orig */

                                instruction->file_entry->file_name,

                                instruction->file_entry->line_nr,

                                cur_field,

                                bits,

                                ((what_to_do & put_values_in_icache)

                                 ? declare_variables

                                 : what_to_declare),

                                what_to_do,

                                "default in icache");

      /* any thing else ... */

    }

  }

  lf_print__internal_reference(file);

  if ((code & generate_with_insn_in_icache)) {

    lf_printf(file, "\n");

    print_icache_extraction(file,

                            instruction,

                            "insn",

                            "instruction_word",

                            "instruction",

                            NULL, /* origin */

                            NULL, 0, /* file_name & line_nr */

                            NULL, NULL,

                            what_to_declare,

                            what_to_do,

                            NULL);

  }

}

typedef struct _icache_tree icache_tree;

struct _icache_tree {

  char *name;

  icache_tree *next;

  icache_tree *children;

};

static icache_tree *

icache_tree_insert(icache_tree *tree,

                   char *name)

{

  icache_tree *new_tree;

  /* find it */

  icache_tree **ptr_to_cur_tree = &tree->children;

  icache_tree *cur_tree = *ptr_to_cur_tree;

  while (cur_tree != NULL

         && strcmp(cur_tree->name, name) < 0) {

    ptr_to_cur_tree = &cur_tree->next;

    cur_tree = *ptr_to_cur_tree;

  }

  ASSERT(cur_tree == NULL

         || strcmp(cur_tree->name, name) >= 0);

  /* already in the tree */

  if (cur_tree != NULL

      && strcmp(cur_tree->name, name) == 0)

    return cur_tree;

  /* missing, insert it */

  ASSERT(cur_tree == NULL

         || strcmp(cur_tree->name, name) > 0);

  new_tree = ZALLOC(icache_tree);

  new_tree->name = name;

  new_tree->next = cur_tree;

  *ptr_to_cur_tree = new_tree;

  return new_tree;

}

static icache_tree *

insn_table_cache_fields(insn_table *table)

{

  icache_tree *tree = ZALLOC(icache_tree);

  insn *instruction;

  for (instruction = table->insns;

       instruction != NULL;

       instruction = instruction->next) {

    insn_field *field;

    icache_tree *form =

      icache_tree_insert(tree,

                         instruction->file_entry->fields[insn_form]);

    for (field = instruction->fields->first;

         field != NULL;

         field = field->next) {

      if (field->is_string)

        icache_tree_insert(form, field->val_string);

    }

  }

  return tree;

}

extern void

print_icache_struct(insn_table *instructions,

                    cache_table *cache_rules,

                    lf *file)

{

  icache_tree *tree = insn_table_cache_fields(instructions);

  lf_printf(file, "\n");

  lf_printf(file, "#define WITH_IDECODE_CACHE_SIZE %d\n",

            (code & generate_with_icache) ? icache_size : 0);

  lf_printf(file, "\n");

  /* create an instruction cache if being used */

  if ((code & generate_with_icache)) {

    icache_tree *form;

    lf_printf(file, "typedef struct _idecode_cache {\n");

    lf_printf(file, "  unsigned_word address;\n");

    lf_printf(file, "  void *semantic;\n");

    lf_printf(file, "  union {\n");

    for (form = tree->children;

         form != NULL;

         form = form->next) {

      icache_tree *field;

      lf_printf(file, "    struct {\n");

      if (code & generate_with_insn_in_icache)

        lf_printf(file, "      instruction_word insn;\n");

      for (field = form->children;

           field != NULL;

           field = field->next) {

        cache_table *cache_rule;

        int found_rule = 0;

        for (cache_rule = cache_rules;

             cache_rule != NULL;

             cache_rule = cache_rule->next) {

          if (strcmp(field->name, cache_rule->field_name) == 0) {

            found_rule = 1;

            if (cache_rule->derived_name != NULL)

              lf_printf(file, "      %s %s; /* %s */\n",

                        (cache_rule->type_def == NULL

                         ? "unsigned"

                         : cache_rule->type_def),

                        cache_rule->derived_name,

                        cache_rule->field_name);

          }

        }

        if (!found_rule)

          lf_printf(file, "      unsigned %s;\n", field->name);

      }

      lf_printf(file, "    } %s;\n", form->name);

    }

    lf_printf(file, "  } crack;\n");

    lf_printf(file, "} idecode_cache;\n");

  }

  else {

    /* alernativly, since no cache, emit a dummy definition for

       idecode_cache so that code refering to the type can still compile */

    lf_printf(file, "typedef void idecode_cache;\n");

  }

  lf_printf(file, "\n");

}

static void

print_icache_function(lf *file,

                      insn *instruction,

                      insn_bits *expanded_bits,

                      opcode_field *opcodes,

                      cache_table *cache_rules)

{

  int indent;

  /* generate code to enter decoded instruction into the icache */

  lf_printf(file, "\n");

  lf_print_function_type(file, ICACHE_FUNCTION_TYPE, "EXTERN_ICACHE", "\n");

  indent = print_function_name(file,

                               instruction->file_entry->fields[insn_name],

                               expanded_bits,

                               function_name_prefix_icache);

  lf_indent(file, +indent);

  lf_printf(file, "(%s)\n", ICACHE_FUNCTION_FORMAL);

  lf_indent(file, -indent);

  /* function header */

  lf_printf(file, "{\n");

  lf_indent(file, +2);

  print_my_defines(file, expanded_bits, instruction->file_entry);

  print_itrace(file, instruction->file_entry, 1/*putting-value-in-cache*/);

  print_idecode_validate(file, instruction, opcodes);

  lf_printf(file, "\n");

  lf_printf(file, "{\n");

  lf_indent(file, +2);

  if ((code & generate_with_semantic_icache))

    lf_printf(file, "unsigned_word nia;\n");

  print_icache_body(file,

                    instruction,

                    expanded_bits,

                    cache_rules,

                    ((code & generate_with_direct_access)

                     ? define_variables

                     : declare_variables),

                    ((code & generate_with_semantic_icache)

                     ? both_values_and_icache

                     : put_values_in_icache));

  lf_printf(file, "\n");

  lf_printf(file, "cache_entry->address = cia;\n");

  lf_printf(file, "cache_entry->semantic = ");

  print_function_name(file,

                      instruction->file_entry->fields[insn_name],

                      expanded_bits,

                      function_name_prefix_semantics);

  lf_printf(file, ";\n");

  lf_printf(file, "\n");

  if ((code & generate_with_semantic_icache)) {

    lf_printf(file, "/* semantic routine */\n");

    print_semantic_body(file,

                        instruction,

                        expanded_bits,

                        opcodes);

    lf_printf(file, "return nia;\n");

  }

  if (!(code & generate_with_semantic_icache)) {

    lf_printf(file, "/* return the function proper */\n");

    lf_printf(file, "return ");

    print_function_name(file,

                        instruction->file_entry->fields[insn_name],

                        expanded_bits,

                        function_name_prefix_semantics);

    lf_printf(file, ";\n");

  }

  if ((code & generate_with_direct_access))

    print_icache_body(file,

                      instruction,

                      expanded_bits,

                      cache_rules,

                      undef_variables,

                      ((code & generate_with_semantic_icache)

                       ? both_values_and_icache

                       : put_values_in_icache));

  lf_indent(file, -2);

  lf_printf(file, "}\n");

  lf_indent(file, -2);

  lf_printf(file, "}\n");

}

void

print_icache_definition(insn_table *entry,

                        lf *file,

                        void *data,

                        insn *instruction,

                        int depth)

{

  cache_table *cache_rules = (cache_table*)data;

  if (generate_expanded_instructions) {

    ASSERT(entry->nr_insn == 1

           && entry->opcode == NULL

           && entry->parent != NULL

           && entry->parent->opcode != NULL);

    ASSERT(entry->nr_insn == 1

           && entry->opcode == NULL

           && entry->parent != NULL

           && entry->parent->opcode != NULL

           && entry->parent->opcode_rule != NULL);

    print_icache_function(file,

                          entry->insns,

                          entry->expanded_bits,

                          entry->opcode,

                          cache_rules);

  }

  else {

    print_icache_function(file,

                          instruction,

                          NULL,

                          NULL,

                          cache_rules);

  }

}

void

print_icache_internal_function_declaration(insn_table *table,

                                           lf *file,

                                           void *data,

                                           table_entry *function)

{

  ASSERT((code & generate_with_icache) != 0);

  if (it_is("internal", function->fields[insn_flags])) {

    lf_printf(file, "\n");

    lf_print_function_type(file, ICACHE_FUNCTION_TYPE, "PSIM_INLINE_ICACHE",

                           "\n");

    print_function_name(file,

                        function->fields[insn_name],

                        NULL,

                        function_name_prefix_icache);

    lf_printf(file, "\n(%s);\n", ICACHE_FUNCTION_FORMAL);

  }

}

void

print_icache_internal_function_definition(insn_table *table,

                                          lf *file,

                                          void *data,

                                          table_entry *function)

{

  ASSERT((code & generate_with_icache) != 0);

  if (it_is("internal", function->fields[insn_flags])) {

    lf_printf(file, "\n");

    lf_print_function_type(file, ICACHE_FUNCTION_TYPE, "PSIM_INLINE_ICACHE",

                           "\n");

    print_function_name(file,

                        function->fields[insn_name],

                        NULL,

                        function_name_prefix_icache);

    lf_printf(file, "\n(%s)\n", ICACHE_FUNCTION_FORMAL);

    lf_printf(file, "{\n");

    lf_indent(file, +2);

    lf_printf(file, "/* semantic routine */\n");

    table_entry_print_cpp_line_nr(file, function);

    if ((code & generate_with_semantic_icache)) {