sim/igen/gen.h

/* The IGEN simulator generator for GDB, the GNU Debugger.

   Copyright 2002-2023 Free Software Foundation, Inc.

   Contributed by Andrew Cagney.

   This file is part of GDB.

   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 3 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, see <http://www.gnu.org/licenses/>.  */


typedef struct _opcode_field opcode_field;
struct _opcode_field
{
  int word_nr;
  int first;
  int last;
  int is_boolean;
  int nr_opcodes;
  unsigned boolean_constant;
  opcode_field *parent;
};

typedef struct _opcode_bits opcode_bits;
struct _opcode_bits
{
  int value;
  int first;
  int last;
  insn_field_entry *field;
  opcode_field *opcode;
  opcode_bits *next;
};

typedef struct _insn_opcodes insn_opcodes;
struct _insn_opcodes
{
  opcode_field *opcode;
  insn_opcodes *next;
};

typedef struct _insn_list insn_list;
struct _insn_list
{
  /* the instruction */
  insn_entry *insn;
  /* list of non constant bits that have been made constant */
  opcode_bits *expanded_bits;
  /* list of the various opcode field paths used to reach this
     instruction */
  insn_opcodes *opcodes;
  /* number of prefetched words for this instruction */
  int nr_prefetched_words;
  /* The semantic function list_entry corresponding to this insn */
  insn_list *semantic;
  /* linked list */
  insn_list *next;
};

/* forward */
typedef struct _gen_list gen_list;

typedef struct _gen_entry gen_entry;
struct _gen_entry
{

  /* as an entry in a table */
  int word_nr;
  int opcode_nr;
  gen_entry *sibling;
  opcode_bits *expanded_bits;
  gen_entry *parent;		/* parent has the opcode* data */

  /* as a table containing entries */
  const decode_table *opcode_rule;
  opcode_field *opcode;
  int nr_prefetched_words;
  int nr_entries;
  gen_entry *entries;

  /* as both an entry and a table */
  int nr_insns;
  insn_list *insns;

  /* if siblings are being combined */
  gen_entry *combined_next;
  gen_entry *combined_parent;

  /* our top-of-tree */
  gen_list *top;
};


struct _gen_list
{
  const model_entry *model;
  const insn_table *isa;
  gen_entry *table;
  gen_list *next;
};


typedef struct _gen_table gen_table;
struct _gen_table
{
  /* list of all the instructions */
  const insn_table *isa;
  /* list of all the semantic functions */
  const decode_table *rules;
  /* list of all the generated instruction tables */
  gen_list *tables;
  /* list of all the semantic functions */
  int nr_semantics;
  insn_list *semantics;
};


extern gen_table *make_gen_tables
  (const insn_table *isa, const decode_table *rules);


extern void gen_tables_expand_insns (gen_table *gen);

extern void gen_tables_expand_semantics (gen_table *gen);

extern int gen_entry_depth (const gen_entry *table);



/* Traverse the created data structure */

typedef void gen_entry_handler
  (lf *file, const gen_entry *entry, int depth, void *data);

extern void gen_entry_traverse_tree
  (lf *file,
   const gen_entry *table,
   int depth,
   gen_entry_handler * start,
   gen_entry_handler * leaf, gen_entry_handler * end, void *data);



/* Misc functions - actually in igen.c */


/* Cache functions: */

extern int print_icache_function_formal (lf *file, int nr_prefetched_words);

extern int print_icache_function_actual (lf *file, int nr_prefetched_words);

extern int print_icache_function_type (lf *file);

extern int print_semantic_function_formal (lf *file, int nr_prefetched_words);

extern int print_semantic_function_actual (lf *file, int nr_prefetched_words);

extern int print_semantic_function_type (lf *file);

extern int print_idecode_function_formal (lf *file, int nr_prefetched_words);

extern int print_idecode_function_actual (lf *file, int nr_prefetched_words);

typedef enum
{
  function_name_prefix_semantics,
  function_name_prefix_idecode,
  function_name_prefix_itable,
  function_name_prefix_icache,
  function_name_prefix_engine,
  function_name_prefix_none
}
lf_function_name_prefixes;

typedef enum
{
  is_function_declaration = 0,
  is_function_definition = 1,
  is_function_variable,
}
function_decl_type;

extern int print_function_name
  (lf *file,
   const char *basename,
   const char *format_name,
   const char *model_name,
   const opcode_bits *expanded_bits,
   lf_function_name_prefixes prefix);

extern void print_my_defines
  (lf *file,
   const char *basename,
   const char *format_name,
   const opcode_bits *expanded_bits);

extern void print_itrace (lf *file, const insn_entry *insn, int idecode);

extern void print_sim_engine_abort (lf *file, const char *message);


extern void print_include (lf *file, igen_module module);
extern void print_include_inline (lf *file, igen_module module);
extern void print_includes (lf *file);