/* Declarations for stacks of tokenized Xtensa instructions.
   Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008
   Free Software Foundation, Inc.

   This file is part of GAS, the GNU Assembler.

   GAS 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, or (at your option)
   any later version.

   GAS 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 GAS; see the file COPYING.  If not, write to the Free
   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
   02110-1301, USA.  */

#ifndef XTENSA_ISTACK_H
#define XTENSA_ISTACK_H

#include "xtensa-isa.h"

#define MAX_ISTACK 12
#define MAX_INSN_ARGS 64

enum itype_enum
{
  ITYPE_INSN,
  ITYPE_LITERAL,
  ITYPE_LABEL
};


/* Literals have 1 token and no opcode.
   Labels have 1 token and no opcode.  */

typedef struct tinsn_struct
{
  enum itype_enum insn_type;

  xtensa_opcode opcode;	/* Literals have an invalid opcode.  */
  bfd_boolean is_specific_opcode;
  bfd_boolean keep_wide;
  int ntok;
  expressionS tok[MAX_INSN_ARGS];
  bfd_boolean loc_directive_seen;
  struct dwarf2_line_info debug_line;

  /* This field is used for two types of special pseudo ops:
     1. TLS-related operations.  Eg:  callx8.tls
     2. j.l  label, a2

     For the tls-related operations, it will hold a tls-related opcode
     and info to be used in a fixup.  For j.l it will hold a
     register to be used during relaxation.  */
  expressionS extra_arg;

  /* Filled out by relaxation_requirements:  */
  enum xtensa_relax_statesE subtype;
  int literal_space;

  /* Filled out by vinsn_to_insnbuf:  */
  symbolS *symbol;
  offsetT offset;
  fragS *literal_frag;
} TInsn;


/* tinsn_stack:  This is a stack of instructions to  be placed.  */

typedef struct tinsn_stack
{
  int ninsn;
  TInsn insn[MAX_ISTACK];
} IStack;


void istack_init (IStack *);
bfd_boolean istack_empty (IStack *);
bfd_boolean istack_full (IStack *);
TInsn *istack_top (IStack *);
void istack_push (IStack *, TInsn *);
TInsn *istack_push_space (IStack *);
void istack_pop (IStack *);

/* TInsn utilities.  */
void tinsn_init (TInsn *);


/* vliw_insn: bundles of TInsns.  */

typedef struct vliw_insn
{
  xtensa_format format;
  int num_slots;
  unsigned int inside_bundle;
  TInsn slots[MAX_SLOTS];
  xtensa_insnbuf insnbuf;
  xtensa_insnbuf slotbuf[MAX_SLOTS];
} vliw_insn;

#endif /* !XTENSA_ISTACK_H */