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vm_exec.c
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/* -*-c-*- */
/**********************************************************************
vm_exec.c -
$Author$
Copyright (C) 2004-2007 Koichi Sasada
**********************************************************************/
#include <math.h>
#if VM_COLLECT_USAGE_DETAILS
static void vm_analysis_insn(int insn);
#endif
#if VMDEBUG > 0
#define DECL_SC_REG(type, r, reg) register type reg_##r
#elif defined(__GNUC__) && defined(__x86_64__)
#define DECL_SC_REG(type, r, reg) register type reg_##r __asm__("r" reg)
#elif defined(__GNUC__) && defined(__i386__)
#define DECL_SC_REG(type, r, reg) register type reg_##r __asm__("e" reg)
#elif defined(__GNUC__) && defined(__powerpc64__)
#define DECL_SC_REG(type, r, reg) register type reg_##r __asm__("r" reg)
#else
#define DECL_SC_REG(type, r, reg) register type reg_##r
#endif
/* #define DECL_SC_REG(r, reg) VALUE reg_##r */
#if VM_DEBUG_STACKOVERFLOW
NORETURN(static void vm_stack_overflow_for_insn(void));
static void
vm_stack_overflow_for_insn(void)
{
rb_bug("CHECK_VM_STACK_OVERFLOW_FOR_INSN: should not overflow here. "
"Please contact ruby-core/dev with your (a part of) script. "
"This check will be removed soon.");
}
#endif
#if !OPT_CALL_THREADED_CODE
static VALUE
vm_exec_core(rb_execution_context_t *ec, VALUE initial)
{
#if OPT_STACK_CACHING
#if 0
#elif __GNUC__ && __x86_64__
DECL_SC_REG(VALUE, a, "12");
DECL_SC_REG(VALUE, b, "13");
#else
register VALUE reg_a;
register VALUE reg_b;
#endif
#endif
#if defined(__GNUC__) && defined(__i386__)
DECL_SC_REG(const VALUE *, pc, "di");
DECL_SC_REG(rb_control_frame_t *, cfp, "si");
#define USE_MACHINE_REGS 1
#elif defined(__GNUC__) && defined(__x86_64__)
DECL_SC_REG(const VALUE *, pc, "14");
DECL_SC_REG(rb_control_frame_t *, cfp, "15");
#define USE_MACHINE_REGS 1
#elif defined(__GNUC__) && defined(__powerpc64__)
DECL_SC_REG(const VALUE *, pc, "14");
DECL_SC_REG(rb_control_frame_t *, cfp, "15");
#define USE_MACHINE_REGS 1
#else
register rb_control_frame_t *reg_cfp;
const VALUE *reg_pc;
#endif
#if USE_MACHINE_REGS
#undef RESTORE_REGS
#define RESTORE_REGS() \
{ \
VM_REG_CFP = ec->cfp; \
reg_pc = reg_cfp->pc; \
}
#undef VM_REG_PC
#define VM_REG_PC reg_pc
#undef GET_PC
#define GET_PC() (reg_pc)
#undef SET_PC
#define SET_PC(x) (reg_cfp->pc = VM_REG_PC = (x))
#endif
#if OPT_TOKEN_THREADED_CODE || OPT_DIRECT_THREADED_CODE
#include "vmtc.inc"
if (UNLIKELY(ec == 0)) {
return (VALUE)insns_address_table;
}
#endif
reg_cfp = ec->cfp;
reg_pc = reg_cfp->pc;
#if OPT_STACK_CACHING
reg_a = initial;
reg_b = 0;
#endif
first:
INSN_DISPATCH();
/*****************/
#include "vm.inc"
/*****************/
END_INSNS_DISPATCH();
/* unreachable */
rb_bug("vm_eval: unreachable");
goto first;
}
const void **
rb_vm_get_insns_address_table(void)
{
return (const void **)vm_exec_core(0, 0);
}
#else /* OPT_CALL_THREADED_CODE */
#include "vm.inc"
#include "vmtc.inc"
const void **
rb_vm_get_insns_address_table(void)
{
return (const void **)insns_address_table;
}
static VALUE
vm_exec_core(rb_execution_context_t *ec, VALUE initial)
{
register rb_control_frame_t *reg_cfp = ec->cfp;
rb_thread_t *th;
while (1) {
reg_cfp = ((rb_insn_func_t) (*GET_PC()))(ec, reg_cfp);
if (UNLIKELY(reg_cfp == 0)) {
break;
}
}
if ((th = rb_ec_thread_ptr(ec))->retval != Qundef) {
VALUE ret = th->retval;
th->retval = Qundef;
return ret;
}
else {
VALUE err = ec->errinfo;
ec->errinfo = Qnil;
return err;
}
}
#endif