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

insnhelper.h - helper macros to implement each instructions

$Author$
created at: 04/01/01 15:50:34 JST

Copyright (C) 2004-2007 Koichi Sasada

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

#ifndef RUBY_INSNHELPER_H
#define RUBY_INSNHELPER_H

/**
* VM Debug Level
*
* debug level:
* 0: no debug output
* 1: show instruction name
* 2: show stack frame when control stack frame is changed
* 3: show stack status
* 4: show register
* 5:
* 10: gc check
*/

#ifndef VMDEBUG
#define VMDEBUG 0
#endif

#if 0
#undef VMDEBUG
#define VMDEBUG 3
#endif

enum {
  BOP_PLUS,
  BOP_MINUS,
  BOP_MULT,
  BOP_DIV,
  BOP_MOD,
  BOP_EQ,
  BOP_EQQ,
  BOP_LT,
  BOP_LE,
  BOP_LTLT,
  BOP_AREF,
  BOP_ASET,
  BOP_LENGTH,
  BOP_SIZE,
  BOP_SUCC,
  BOP_GT,
  BOP_GE,
  BOP_NOT,
  BOP_NEQ,

  BOP_LAST_
};

extern char ruby_vm_redefined_flag[BOP_LAST_];
extern VALUE ruby_vm_const_missing_count;


/**********************************************************/
/* deal with stack */
/**********************************************************/

#define PUSH(x) (SET_SV(x), INC_SP(1))
#define TOPN(n) (*(GET_SP()-(n)-1))
#define POPN(n) (DEC_SP(n))
#define POP() (DEC_SP(1))
#define STACK_ADDR_FROM_TOP(n) (GET_SP()-(n))

#define GET_TOS() (tos) /* dummy */

/**********************************************************/
/* deal with registers */
/**********************************************************/

#define REG_CFP (reg_cfp)
#define REG_PC (REG_CFP->pc)
#define REG_SP (REG_CFP->sp)
#define REG_EP (REG_CFP->ep)

#define RESTORE_REGS() do { \
REG_CFP = th->cfp; \
} while (0)

#define REG_A reg_a
#define REG_B reg_b

enum vm_regan_regtype {
    VM_REGAN_PC = 0,
    VM_REGAN_SP = 1,
    VM_REGAN_EP = 2,
    VM_REGAN_CFP = 3,
    VM_REGAN_SELF = 4,
    VM_REGAN_ISEQ = 5,
};
enum vm_regan_acttype {
    VM_REGAN_ACT_GET = 0,
    VM_REGAN_ACT_SET = 1,
};

#ifdef COLLECT_USAGE_ANALYSIS
#define USAGE_ANALYSIS_REGISTER_HELPER(a, b, v) \
(USAGE_ANALYSIS_REGISTER((VM_REGAN_#a), (VM_REGAN_ACT_#b)), (v))
#else
#define USAGE_ANALYSIS_REGISTER_HELPER(a, b, v) (v)
#endif

/* PC */
#define GET_PC() (USAGE_ANALYSIS_REGISTER_HELPER(PC, GET, REG_PC))
#define SET_PC(x) (REG_PC = (USAGE_ANALYSIS_REGISTER_HELPER(PC, SET, (x))))
#define GET_CURRENT_INSN() (*GET_PC())
#define GET_OPERAND(n) (GET_PC()[(n)])
#define ADD_PC(n) (SET_PC(REG_PC + (n)))

#define GET_PC_COUNT() (REG_PC - GET_ISEQ()->iseq_encoded)
#define JUMP(dst) (REG_PC += (dst))

/* frame pointer, environment pointer */
#define GET_CFP() (USAGE_ANALYSIS_REGISTER_HELPER(CFP, GET, REG_CFP))
#define GET_EP() (USAGE_ANALYSIS_REGISTER_HELPER(EP, GET, REG_EP))
#define SET_EP(x) (REG_EP = (USAGE_ANALYSIS_REGISTER_HELPER(EP, SET, (x))))
#define GET_LEP() (VM_EP_LEP(GET_EP()))

/* SP */
#define GET_SP() (USAGE_ANALYSIS_REGISTER_HELPER(SP, GET, REG_SP))
#define SET_SP(x) (REG_SP = (USAGE_ANALYSIS_REGISTER_HELPER(SP, SET, (x))))
#define INC_SP(x) (REG_SP += (USAGE_ANALYSIS_REGISTER_HELPER(SP, SET, (x))))
#define DEC_SP(x) (REG_SP -= (USAGE_ANALYSIS_REGISTER_HELPER(SP, SET, (x))))
#define SET_SV(x) (*GET_SP() = (x))
  /* set current stack value as x */

#define GET_SP_COUNT() (REG_SP - th->stack)

/* instruction sequence C struct */
#define GET_ISEQ() (GET_CFP()->iseq)

/**********************************************************/
/* deal with variables */
/**********************************************************/

#define GET_PREV_EP(ep) ((VALUE *)((ep)[0] & ~0x03))

#define GET_GLOBAL(entry) rb_gvar_get((struct rb_global_entry*)(entry))
#define SET_GLOBAL(entry, val) rb_gvar_set((struct rb_global_entry*)(entry), (val))

#define GET_CONST_INLINE_CACHE(dst) ((IC) * (GET_PC() + (dst) + 2))

/**********************************************************/
/* deal with values */
/**********************************************************/

#define GET_SELF() (USAGE_ANALYSIS_REGISTER_HELPER(5, 0, GET_CFP()->self))

/**********************************************************/
/* deal with control flow 2: method/iterator */
/**********************************************************/

#define COPY_CREF_OMOD(c1, c2) do { \
(c1)->nd_omod = (c2)->nd_omod; \
if (!NIL_P((c2)->nd_omod)) { \
(c1)->flags |= NODE_FL_CREF_OMOD_SHARED; \
(c2)->flags |= NODE_FL_CREF_OMOD_SHARED; \
} \
} while (0)

#define COPY_CREF(c1, c2) do { \
NODE *__tmp_c2 = (c2); \
COPY_CREF_OMOD(c1, __tmp_c2); \
(c1)->nd_clss = __tmp_c2->nd_clss; \
(c1)->nd_visi = __tmp_c2->nd_visi;\
(c1)->nd_next = __tmp_c2->nd_next; \
if (__tmp_c2->flags & NODE_FL_CREF_PUSHED_BY_EVAL) { \
(c1)->flags |= NODE_FL_CREF_PUSHED_BY_EVAL; \
} \
} while (0)

#define CALL_METHOD(num, blockptr, flag, id, me, recv, defined_class) do { \
VALUE v = vm_call_method(th, GET_CFP(), (num), (blockptr), (flag), (id), (me), (recv), (defined_class)); \
if (v == Qundef) { \
RESTORE_REGS(); \
NEXT_INSN(); \
} \
else { \
val = v; \
} \
} while (0)

#define GET_BLOCK_PTR() ((rb_block_t *)(GC_GUARDED_PTR_REF(GET_LEP()[0])))

/**********************************************************/
/* deal with control flow 3: exception */
/**********************************************************/


/**********************************************************/
/* others */
/**********************************************************/

/* optimize insn */
#define FIXNUM_REDEFINED_OP_FLAG (1 << 0)
#define FLOAT_REDEFINED_OP_FLAG (1 << 1)
#define STRING_REDEFINED_OP_FLAG (1 << 2)
#define ARRAY_REDEFINED_OP_FLAG (1 << 3)
#define HASH_REDEFINED_OP_FLAG (1 << 4)
#define BIGNUM_REDEFINED_OP_FLAG (1 << 5)
#define SYMBOL_REDEFINED_OP_FLAG (1 << 6)
#define TIME_REDEFINED_OP_FLAG (1 << 7)

#define BASIC_OP_UNREDEFINED_P(op, klass) (LIKELY((ruby_vm_redefined_flag[(op)]&(klass)) == 0))

#define FIXNUM_2_P(a, b) ((a) & (b) & 1)
#if USE_FLONUM
#define FLONUM_2_P(a, b) (((((a)^2) | ((b)^2)) & 3) == 0) /* (FLONUM_P(a) && FLONUM_P(b)) */
#else
#define FLONUM_2_P(a, b) 0
#endif
#define HEAP_CLASS_OF(obj) (RBASIC(obj)->klass)

#ifndef USE_IC_FOR_SPECIALIZED_METHOD
#define USE_IC_FOR_SPECIALIZED_METHOD 1
#endif

#if USE_IC_FOR_SPECIALIZED_METHOD

#define CALL_SIMPLE_METHOD(num, id, recv) do { \
VALUE klass = CLASS_OF(recv), defined_class; \
const rb_method_entry_t *me = vm_method_search((id), klass, ic, &defined_class); \
CALL_METHOD((num), 0, 0, (id), me, (recv), defined_class); \
} while (0)

#else

#define CALL_SIMPLE_METHOD(num, id, recv) do { \
VALUE klass = CLASS_OF(recv); \
CALL_METHOD((num), 0, 0, (id), rb_method_entry(klass, (id)), (recv)); \
} while (0)

#endif

static VALUE ruby_vm_global_state_version = 1;

#define GET_VM_STATE_VERSION() (ruby_vm_global_state_version)
#define INC_VM_STATE_VERSION() do { \
ruby_vm_global_state_version = (ruby_vm_global_state_version + 1); \
if (ruby_vm_global_state_version == 0) vm_clear_all_cache(); \
} while (0)
static void vm_clear_all_cache(void);

static VALUE make_no_method_exception(VALUE exc, const char *format,
VALUE obj, int argc, const VALUE *argv);


#endif /* RUBY_INSNHELPER_H */
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