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

vm.h -

$Author$
created at: 04/01/01 16:56:59 JST

Copyright (C) 2004-2007 Koichi Sasada

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

#ifndef RUBY_VM_EXEC_H
#define RUBY_VM_EXEC_H

typedef long OFFSET;
typedef unsigned long lindex_t;
typedef unsigned long dindex_t;
typedef rb_num_t GENTRY;
typedef rb_iseq_t *ISEQ;

#ifdef COLLECT_USAGE_ANALYSIS
#define USAGE_ANALYSIS_INSN(insn) vm_analysis_insn(insn)
#define USAGE_ANALYSIS_OPERAND(insn, n, op) vm_analysis_operand(insn, n, (VALUE)op)
#define USAGE_ANALYSIS_REGISTER(reg, s) vm_analysis_register(reg, s)
#else
#define USAGE_ANALYSIS_INSN(insn) /* none */
#define USAGE_ANALYSIS_OPERAND(insn, n, op) /* none */
#define USAGE_ANALYSIS_REGISTER(reg, s) /* none */
#endif

#ifdef __GCC__
/* TODO: machine dependent prefetch instruction */
#define PREFETCH(pc)
#else
#define PREFETCH(pc)
#endif

#if VMDEBUG > 0
#define debugs printf
#define DEBUG_ENTER_INSN(insn) \
debug_print_pre(th, GET_CFP());

#if OPT_STACK_CACHING
#define SC_REGS() , reg_a, reg_b
#else
#define SC_REGS()
#endif

#define DEBUG_END_INSN() \
debug_print_post(th, GET_CFP() SC_REGS());

#else

#define debugs
extern const char *rb_vm_insn_name(int);
#define DEBUG_ENTER_INSN(insn) \
do { \
if (UNLIKELY(TRACE_INSN_ENTRY_ENABLED())) { \
rb_control_frame_t *cfp = GET_CFP(); \
rb_iseq_t *iseq = cfp->iseq; \
if (iseq != NULL && VM_FRAME_TYPE(cfp) != VM_FRAME_MAGIC_FINISH) { \
VALUE *seq = iseq->iseq; \
int pc = cfp->pc - iseq->iseq_encoded; \
FIRE_INSN_ENTRY((char *)rb_vm_insn_name(seq[pc]), \
seq+1, \
(char *)rb_sourcefile(), \
rb_sourceline()); \
} \
} \
} \
while (0)
#define DEBUG_END_INSN() \
do { \
if (UNLIKELY(TRACE_INSN_RETURN_ENABLED())) { \
rb_control_frame_t *cfp = GET_CFP(); \
rb_iseq_t *iseq = cfp->iseq; \
if (iseq != NULL && VM_FRAME_TYPE(cfp) != VM_FRAME_MAGIC_FINISH) { \
VALUE *seq = iseq->iseq; \
int pc = cfp->pc - iseq->iseq_encoded; \
FIRE_INSN_RETURN((char *)rb_vm_insn_name(seq[pc]), \
seq+1, \
(char *)rb_sourcefile(), \
rb_sourceline()); \
} \
} \
} \
while (0)
#endif

#define throwdebug if(0)printf
/* #define throwdebug printf */

/************************************************/
#if DISPATCH_XXX
error !
/************************************************/
#elif OPT_CALL_THREADED_CODE

#define LABEL(x) insn_func_##x
#define ELABEL(x)
#define LABEL_PTR(x) &LABEL(x)

#define INSN_ENTRY(insn) \
static rb_control_frame_t * \
FUNC_FASTCALL(LABEL(insn))(rb_thread_t *th, rb_control_frame_t *reg_cfp) {

#define END_INSN(insn) return reg_cfp;}

#define NEXT_INSN() return reg_cfp;

/************************************************/
#elif OPT_TOKEN_THREADED_CODE || OPT_DIRECT_THREADED_CODE
/* threaded code with gcc */

#define LABEL(x) INSN_LABEL_##x
#define ELABEL(x) INSN_ELABEL_##x
#define LABEL_PTR(x) &&LABEL(x)

#define INSN_ENTRY_SIG(insn)


#define INSN_DISPATCH_SIG(insn)

#define INSN_ENTRY(insn) \
LABEL(insn): \
INSN_ENTRY_SIG(insn); \

/* dispather */
#if __GNUC__ && (__i386__ || __x86_64__) && __GNUC__ == 3
#define DISPATCH_ARCH_DEPEND_WAY(addr) \
asm volatile("jmp *%0;\t# -- inseted by vm.h\t[length = 2]" : : "r" (addr))

#else
#define DISPATCH_ARCH_DEPEND_WAY(addr) \
/* do nothing */

#endif


/**********************************/
#if OPT_DIRECT_THREADED_CODE

/* for GCC 3.4.x */
#define TC_DISPATCH(insn) \
INSN_DISPATCH_SIG(insn); \
goto *GET_CURRENT_INSN(); \
;

#else
/* token threade code */

#define TC_DISPATCH(insn) \
DISPATCH_ARCH_DEPEND_WAY(insns_address_table[GET_CURRENT_INSN()]); \
INSN_DISPATCH_SIG(insn); \
goto *insns_address_table[GET_CURRENT_INSN()]; \
rb_bug("tc error");


#endif /* DISPATCH_DIRECT_THREADED_CODE */

#define END_INSN(insn) \
DEBUG_END_INSN(); \
TC_DISPATCH(insn); \

#define INSN_DISPATCH() \
TC_DISPATCH(__START__) \
{

#define END_INSNS_DISPATCH() \
rb_bug("unknown insn: %ld", GET_CURRENT_INSN()); \
} /* end of while loop */ \

#define NEXT_INSN() TC_DISPATCH(__NEXT_INSN__)

/************************************************/
#else /* no threaded code */
/* most common method */

#define INSN_ENTRY(insn) \
case BIN(insn):

#define END_INSN(insn) \
DEBUG_END_INSN(); \
break;


#define INSN_DISPATCH() \
while(1){ \
switch(GET_CURRENT_INSN()){

#define END_INSNS_DISPATCH() \
default: \
SDR(); \
rb_bug("unknown insn: %ld", GET_CURRENT_INSN()); \
} /* end of switch */ \
} /* end of while loop */ \

#define NEXT_INSN() goto first

#endif

#define VM_SP_CNT(th, sp) ((sp) - (th)->stack)

#if OPT_CALL_THREADED_CODE
#define THROW_EXCEPTION(exc) do { \
th->errinfo = (VALUE)(exc); \
return 0; \
} while (0)
#else
#define THROW_EXCEPTION(exc) return (VALUE)(exc)
#endif

#define SCREG(r) (reg_##r)

#endif /* RUBY_VM_EXEC_H */
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