vm.c

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/**********************************************************************
 
  vm.c -
 
  $Author$
 
  Copyright (C) 2004-2007 Koichi Sasada
 
**********************************************************************/
 
#include "internal.h"
#include "ruby/vm.h"
#include "ruby/st.h"
 
#define vm_exec rb_vm_exec
 
#include "gc.h"
#include "vm_core.h"
#include "vm_debug.h"
#include "iseq.h"
#include "eval_intern.h"
#include "builtin.h"
 
#ifndef MJIT_HEADER
#include "probes.h"
#else
#include "probes.dmyh"
#endif
#include "probes_helper.h"
 
VALUE rb_str_concat_literals(size_t, const VALUE*);
 
/* :FIXME: This #ifdef is because we build pch in case of mswin and
 * not in case of other situations.  That distinction might change in
 * a future.  We would better make it detectable in something better
 * than just _MSC_VER. */
#ifdef _MSC_VER
RUBY_FUNC_EXPORTED
#else
MJIT_FUNC_EXPORTED
#endif
VALUE vm_exec(rb_execution_context_t *, int);
 
PUREFUNC(static inline const VALUE *VM_EP_LEP(const VALUE *));
static inline const VALUE *
VM_EP_LEP(const VALUE *ep)
{
    while (!VM_ENV_LOCAL_P(ep)) {
        ep = VM_ENV_PREV_EP(ep);
    }
    return ep;
}
 
static inline const rb_control_frame_t *
rb_vm_search_cf_from_ep(const rb_execution_context_t *ec, const rb_control_frame_t *cfp, const VALUE * const ep)
{
    if (!ep) {
        return NULL;
    }
    else {
        const rb_control_frame_t * const eocfp = RUBY_VM_END_CONTROL_FRAME(ec); /* end of control frame pointer */
 
        while (cfp < eocfp) {
            if (cfp->ep == ep) {
                return cfp;
            }
            cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
        }
 
        return NULL;
    }
}
 
const VALUE *
rb_vm_ep_local_ep(const VALUE *ep)
{
    return VM_EP_LEP(ep);
}
 
PUREFUNC(static inline const VALUE *VM_CF_LEP(const rb_control_frame_t * const cfp));
static inline const VALUE *
VM_CF_LEP(const rb_control_frame_t * const cfp)
{
    return VM_EP_LEP(cfp->ep);
}
 
static inline const VALUE *
VM_CF_PREV_EP(const rb_control_frame_t * const cfp)
{
    return VM_ENV_PREV_EP(cfp->ep);
}
 
PUREFUNC(static inline VALUE VM_CF_BLOCK_HANDLER(const rb_control_frame_t * const cfp));
static inline VALUE
VM_CF_BLOCK_HANDLER(const rb_control_frame_t * const cfp)
{
    const VALUE *ep = VM_CF_LEP(cfp);
    return VM_ENV_BLOCK_HANDLER(ep);
}
 
int
rb_vm_cframe_keyword_p(const rb_control_frame_t *cfp)
{
    return VM_FRAME_CFRAME_KW_P(cfp);
}
 
/* -- Remove In 3.0 -- */
int
rb_vm_cframe_empty_keyword_p(const rb_control_frame_t *cfp)
{
    return VM_FRAME_CFRAME_EMPTY_KW_P(cfp);
}
 
VALUE
rb_vm_frame_block_handler(const rb_control_frame_t *cfp)
{
    return VM_CF_BLOCK_HANDLER(cfp);
}
 
#if VM_CHECK_MODE > 0
static int
VM_CFP_IN_HEAP_P(const rb_execution_context_t *ec, const rb_control_frame_t *cfp)
{
    const VALUE *start = ec->vm_stack;
    const VALUE *end = (VALUE *)ec->vm_stack + ec->vm_stack_size;
    VM_ASSERT(start != NULL);
 
    if (start <= (VALUE *)cfp && (VALUE *)cfp < end) {
        return FALSE;
    }
    else {
        return TRUE;
    }
}
 
static int
VM_EP_IN_HEAP_P(const rb_execution_context_t *ec, const VALUE *ep)
{
    const VALUE *start = ec->vm_stack;
    const VALUE *end = (VALUE *)ec->cfp;
    VM_ASSERT(start != NULL);
 
    if (start <= ep && ep < end) {
        return FALSE;
    }
    else {
        return TRUE;
    }
}
 
int
vm_ep_in_heap_p_(const rb_execution_context_t *ec, const VALUE *ep)
{
    if (VM_EP_IN_HEAP_P(ec, ep)) {
        VALUE envval = ep[VM_ENV_DATA_INDEX_ENV]; /* VM_ENV_ENVVAL(ep); */
 
        if (envval != Qundef) {
            const rb_env_t *env = (const rb_env_t *)envval;
 
            VM_ASSERT(vm_assert_env(envval));
            VM_ASSERT(VM_ENV_FLAGS(ep, VM_ENV_FLAG_ESCAPED));
            VM_ASSERT(env->ep == ep);
        }
        return TRUE;
    }
    else {
        return FALSE;
    }
}
 
int
rb_vm_ep_in_heap_p(const VALUE *ep)
{
    const rb_execution_context_t *ec = GET_EC();
    if (ec->vm_stack == NULL) return TRUE;
    return vm_ep_in_heap_p_(ec, ep);
}
#endif
 
static struct rb_captured_block *
VM_CFP_TO_CAPTURED_BLOCK(const rb_control_frame_t *cfp)
{
    VM_ASSERT(!VM_CFP_IN_HEAP_P(GET_EC(), cfp));
    return (struct rb_captured_block *)&cfp->self;
}
 
static rb_control_frame_t *
VM_CAPTURED_BLOCK_TO_CFP(const struct rb_captured_block *captured)
{
    rb_control_frame_t *cfp = ((rb_control_frame_t *)((VALUE *)(captured) - 3));
    VM_ASSERT(!VM_CFP_IN_HEAP_P(GET_EC(), cfp));
    VM_ASSERT(sizeof(rb_control_frame_t)/sizeof(VALUE) == 7 + VM_DEBUG_BP_CHECK ? 1 : 0);
    return cfp;
}
 
static int
VM_BH_FROM_CFP_P(VALUE block_handler, const rb_control_frame_t *cfp)
{
    const struct rb_captured_block *captured = VM_CFP_TO_CAPTURED_BLOCK(cfp);
    return VM_TAGGED_PTR_REF(block_handler, 0x03) == captured;
}
 
static VALUE
vm_passed_block_handler(rb_execution_context_t *ec)
{
    VALUE block_handler = ec->passed_block_handler;
    ec->passed_block_handler = VM_BLOCK_HANDLER_NONE;
    vm_block_handler_verify(block_handler);
    return block_handler;
}
 
static rb_cref_t *
vm_cref_new0(VALUE klass, rb_method_visibility_t visi, int module_func, rb_cref_t *prev_cref, int pushed_by_eval, int use_prev_prev)
{
    VALUE refinements = Qnil;
    int omod_shared = FALSE;
    rb_cref_t *cref;
 
    /* scope */
    union {
        rb_scope_visibility_t visi;
        VALUE value;
    } scope_visi;
 
    scope_visi.visi.method_visi = visi;
    scope_visi.visi.module_func = module_func;
 
    /* refinements */
    if (prev_cref != NULL && prev_cref != (void *)1 /* TODO: why CREF_NEXT(cref) is 1? */) {
        refinements = CREF_REFINEMENTS(prev_cref);
 
        if (!NIL_P(refinements)) {
            omod_shared = TRUE;
            CREF_OMOD_SHARED_SET(prev_cref);
        }
    }
 
    cref = (rb_cref_t *)rb_imemo_new(imemo_cref, klass, (VALUE)(use_prev_prev ? CREF_NEXT(prev_cref) : prev_cref), scope_visi.value, refinements);
 
    if (pushed_by_eval) CREF_PUSHED_BY_EVAL_SET(cref);
    if (omod_shared) CREF_OMOD_SHARED_SET(cref);
 
    return cref;
}
 
static rb_cref_t *
vm_cref_new(VALUE klass, rb_method_visibility_t visi, int module_func, rb_cref_t *prev_cref, int pushed_by_eval)
{
    return vm_cref_new0(klass, visi, module_func, prev_cref, pushed_by_eval, FALSE);
}
 
static rb_cref_t *
vm_cref_new_use_prev(VALUE klass, rb_method_visibility_t visi, int module_func, rb_cref_t *prev_cref, int pushed_by_eval)
{
    return vm_cref_new0(klass, visi, module_func, prev_cref, pushed_by_eval, TRUE);
}
 
static int
ref_delete_symkey(VALUE key, VALUE value, VALUE unused)
{
    return SYMBOL_P(key) ? ST_DELETE : ST_CONTINUE;
}
 
static rb_cref_t *
vm_cref_dup(const rb_cref_t *cref)
{
    VALUE klass = CREF_CLASS(cref);
    const rb_scope_visibility_t *visi = CREF_SCOPE_VISI(cref);
    rb_cref_t *next_cref = CREF_NEXT(cref), *new_cref;
    int pushed_by_eval = CREF_PUSHED_BY_EVAL(cref);
 
    new_cref = vm_cref_new(klass, visi->method_visi, visi->module_func, next_cref, pushed_by_eval);
 
    if (!NIL_P(CREF_REFINEMENTS(cref))) {
        VALUE ref = rb_hash_dup(CREF_REFINEMENTS(cref));
        rb_hash_foreach(ref, ref_delete_symkey, Qnil);
        CREF_REFINEMENTS_SET(new_cref, ref);
        CREF_OMOD_SHARED_UNSET(new_cref);
    }
 
    return new_cref;
}
 
static rb_cref_t *
vm_cref_new_toplevel(rb_execution_context_t *ec)
{
    rb_cref_t *cref = vm_cref_new(rb_cObject, METHOD_VISI_PRIVATE /* toplevel visibility is private */, FALSE, NULL, FALSE);
    VALUE top_wrapper = rb_ec_thread_ptr(ec)->top_wrapper;
 
    if (top_wrapper) {
        cref = vm_cref_new(top_wrapper, METHOD_VISI_PRIVATE, FALSE, cref, FALSE);
    }
 
    return cref;
}
 
rb_cref_t *
rb_vm_cref_new_toplevel(void)
{
    return vm_cref_new_toplevel(GET_EC());
}
 
static void
vm_cref_dump(const char *mesg, const rb_cref_t *cref)
{
    fprintf(stderr, "vm_cref_dump: %s (%p)\n", mesg, (void *)cref);
 
    while (cref) {
        fprintf(stderr, "= cref| klass: %s\n", RSTRING_PTR(rb_class_path(CREF_CLASS(cref))));
        cref = CREF_NEXT(cref);
    }
}
 
void
rb_vm_block_ep_update(VALUE obj, const struct rb_block *dst, const VALUE *ep)
{
    *((const VALUE **)&dst->as.captured.ep) = ep;
    RB_OBJ_WRITTEN(obj, Qundef, VM_ENV_ENVVAL(ep));
}
 
static void
vm_bind_update_env(VALUE bindval, rb_binding_t *bind, VALUE envval)
{
    const rb_env_t *env = (rb_env_t *)envval;
    RB_OBJ_WRITE(bindval, &bind->block.as.captured.code.iseq, env->iseq);
    rb_vm_block_ep_update(bindval, &bind->block, env->ep);
}
 
#if VM_COLLECT_USAGE_DETAILS
static void vm_collect_usage_operand(int insn, int n, VALUE op);
static void vm_collect_usage_insn(int insn);
static void vm_collect_usage_register(int reg, int isset);
#endif
 
static VALUE vm_make_env_object(const rb_execution_context_t *ec, rb_control_frame_t *cfp);
extern VALUE rb_vm_invoke_bmethod(rb_execution_context_t *ec, rb_proc_t *proc, VALUE self,
                                  int argc, const VALUE *argv, int kw_splat, VALUE block_handler,
                                  const rb_callable_method_entry_t *me);
static VALUE vm_invoke_proc(rb_execution_context_t *ec, rb_proc_t *proc, VALUE self, int argc, const VALUE *argv, int kw_splat, VALUE block_handler);
 
#include "mjit.h"
#include "vm_insnhelper.h"
#include "vm_exec.h"
#include "vm_insnhelper.c"
 
#ifndef MJIT_HEADER
 
#include "vm_exec.c"
 
#include "vm_method.c"
#endif /* #ifndef MJIT_HEADER */
#include "vm_eval.c"
#ifndef MJIT_HEADER
 
#define PROCDEBUG 0
 
rb_serial_t
rb_next_class_serial(void)
{
    rb_serial_t class_serial = NEXT_CLASS_SERIAL();
    mjit_add_class_serial(class_serial);
    return class_serial;
}
 
VALUE rb_cRubyVM;
VALUE rb_cThread;
VALUE rb_mRubyVMFrozenCore;
VALUE rb_block_param_proxy;
 
#define ruby_vm_redefined_flag GET_VM()->redefined_flag
VALUE ruby_vm_const_missing_count = 0;
rb_vm_t *ruby_current_vm_ptr = NULL;
rb_execution_context_t *ruby_current_execution_context_ptr = NULL;
 
rb_event_flag_t ruby_vm_event_flags;
rb_event_flag_t ruby_vm_event_enabled_global_flags;
unsigned int    ruby_vm_event_local_num;
 
rb_serial_t ruby_vm_global_method_state = 1;
rb_serial_t ruby_vm_global_constant_state = 1;
rb_serial_t ruby_vm_class_serial = 1;
 
static void thread_free(void *ptr);
 
void
rb_vm_inc_const_missing_count(void)
{
    ruby_vm_const_missing_count +=1;
}
 
MJIT_FUNC_EXPORTED int
rb_dtrace_setup(rb_execution_context_t *ec, VALUE klass, ID id,
                struct ruby_dtrace_method_hook_args *args)
{
    enum ruby_value_type type;
    if (!klass) {
        if (!ec) ec = GET_EC();
        if (!rb_ec_frame_method_id_and_class(ec, &id, 0, &klass) || !klass)
            return FALSE;
    }
    if (RB_TYPE_P(klass, T_ICLASS)) {
        klass = RBASIC(klass)->klass;
    }
    else if (FL_TEST(klass, FL_SINGLETON)) {
        klass = rb_attr_get(klass, id__attached__);
        if (NIL_P(klass)) return FALSE;
    }
    type = BUILTIN_TYPE(klass);
    if (type == T_CLASS || type == T_ICLASS || type == T_MODULE) {
        VALUE name = rb_class_path(klass);
        const char *classname, *filename;
        const char *methodname = rb_id2name(id);
        if (methodname && (filename = rb_source_location_cstr(&args->line_no)) != 0) {
            if (NIL_P(name) || !(classname = StringValuePtr(name)))
                classname = "<unknown>";
            args->classname = classname;
            args->methodname = methodname;
            args->filename = filename;
            args->klass = klass;
            args->name = name;
            return TRUE;
        }
    }
    return FALSE;
}
 
/*
 *  call-seq:
 *    RubyVM.stat -> Hash
 *    RubyVM.stat(hsh) -> hsh
 *    RubyVM.stat(Symbol) -> Numeric
 *
 *  Returns a Hash containing implementation-dependent counters inside the VM.
 *
 *  This hash includes information about method/constant cache serials:
 *
 *    {
 *      :global_method_state=>251,
 *      :global_constant_state=>481,
 *      :class_serial=>9029
 *    }
 *
 *  The contents of the hash are implementation specific and may be changed in
 *  the future.
 *
 *  This method is only expected to work on C Ruby.
 */
 
static VALUE
vm_stat(int argc, VALUE *argv, VALUE self)
{
    static VALUE sym_global_method_state, sym_global_constant_state, sym_class_serial;
    VALUE arg = Qnil;
    VALUE hash = Qnil, key = Qnil;
 
    if (rb_check_arity(argc, 0, 1) == 1) {
        arg = argv[0];
        if (SYMBOL_P(arg))
            key = arg;
        else if (RB_TYPE_P(arg, T_HASH))
            hash = arg;
        else
            rb_raise(rb_eTypeError, "non-hash or symbol given");
    }
    else {
        hash = rb_hash_new();
    }
 
    if (sym_global_method_state == 0) {
#define S(s) sym_##s = ID2SYM(rb_intern_const(#s))
        S(global_method_state);
        S(global_constant_state);
        S(class_serial);
#undef S
    }
 
#define SET(name, attr) \
    if (key == sym_##name) \
        return SERIALT2NUM(attr); \
    else if (hash != Qnil) \
        rb_hash_aset(hash, sym_##name, SERIALT2NUM(attr));
 
    SET(global_method_state, ruby_vm_global_method_state);
    SET(global_constant_state, ruby_vm_global_constant_state);
    SET(class_serial, ruby_vm_class_serial);
#undef SET
 
    if (!NIL_P(key)) { /* matched key should return above */
        rb_raise(rb_eArgError, "unknown key: %"PRIsVALUE, rb_sym2str(key));
    }
 
    return hash;
}
 
/* control stack frame */
 
static void
vm_set_top_stack(rb_execution_context_t *ec, const rb_iseq_t *iseq)
{
    if (iseq->body->type != ISEQ_TYPE_TOP) {
        rb_raise(rb_eTypeError, "Not a toplevel InstructionSequence");
    }
 
    /* for return */
    vm_push_frame(ec, iseq, VM_FRAME_MAGIC_TOP | VM_ENV_FLAG_LOCAL | VM_FRAME_FLAG_FINISH, rb_ec_thread_ptr(ec)->top_self,
                  VM_BLOCK_HANDLER_NONE,
                  (VALUE)vm_cref_new_toplevel(ec), /* cref or me */
                  iseq->body->iseq_encoded, ec->cfp->sp,
                  iseq->body->local_table_size, iseq->body->stack_max);
}
 
static void
vm_set_eval_stack(rb_execution_context_t *ec, const rb_iseq_t *iseq, const rb_cref_t *cref, const struct rb_block *base_block)
{
    vm_push_frame(ec, iseq, VM_FRAME_MAGIC_EVAL | VM_FRAME_FLAG_FINISH,
                  vm_block_self(base_block), VM_GUARDED_PREV_EP(vm_block_ep(base_block)),
                  (VALUE)cref, /* cref or me */
                  iseq->body->iseq_encoded,
                  ec->cfp->sp, iseq->body->local_table_size,
                  iseq->body->stack_max);
}
 
static void
vm_set_main_stack(rb_execution_context_t *ec, const rb_iseq_t *iseq)
{
    VALUE toplevel_binding = rb_const_get(rb_cObject, rb_intern("TOPLEVEL_BINDING"));
    rb_binding_t *bind;
 
    GetBindingPtr(toplevel_binding, bind);
    RUBY_ASSERT_MESG(bind, "TOPLEVEL_BINDING is not built");
 
    vm_set_eval_stack(ec, iseq, 0, &bind->block);
 
    /* save binding */
    if (iseq->body->local_table_size > 0) {
        vm_bind_update_env(toplevel_binding, bind, vm_make_env_object(ec, ec->cfp));
    }
}
 
rb_control_frame_t *
rb_vm_get_binding_creatable_next_cfp(const rb_execution_context_t *ec, const rb_control_frame_t *cfp)
{
    while (!RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(ec, cfp)) {
        if (cfp->iseq) {
            return (rb_control_frame_t *)cfp;
        }
        cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
    }
    return 0;
}
 
MJIT_FUNC_EXPORTED rb_control_frame_t *
rb_vm_get_ruby_level_next_cfp(const rb_execution_context_t *ec, const rb_control_frame_t *cfp)
{
    if (RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(ec, cfp)) bp();
    while (!RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(ec, cfp)) {
        if (VM_FRAME_RUBYFRAME_P(cfp)) {
            return (rb_control_frame_t *)cfp;
        }
        cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
    }
    return 0;
}
 
#endif /* #ifndef MJIT_HEADER */
 
static rb_control_frame_t *
vm_get_ruby_level_caller_cfp(const rb_execution_context_t *ec, const rb_control_frame_t *cfp)
{
    if (VM_FRAME_RUBYFRAME_P(cfp)) {
        return (rb_control_frame_t *)cfp;
    }
 
    cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
 
    while (!RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(ec, cfp)) {
        if (VM_FRAME_RUBYFRAME_P(cfp)) {
            return (rb_control_frame_t *)cfp;
        }
 
        if (VM_ENV_FLAGS(cfp->ep, VM_FRAME_FLAG_PASSED) == FALSE) {
            break;
        }
        cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
    }
    return 0;
}
 
MJIT_STATIC void
rb_vm_pop_cfunc_frame(void)
{
    rb_execution_context_t *ec = GET_EC();
    rb_control_frame_t *cfp = ec->cfp;
    const rb_callable_method_entry_t *me = rb_vm_frame_method_entry(cfp);
 
    EXEC_EVENT_HOOK(ec, RUBY_EVENT_C_RETURN, cfp->self, me->def->original_id, me->called_id, me->owner, Qnil);
    RUBY_DTRACE_CMETHOD_RETURN_HOOK(ec, me->owner, me->def->original_id);
    vm_pop_frame(ec, cfp, cfp->ep);
}
 
#ifndef MJIT_HEADER
 
void
rb_vm_rewind_cfp(rb_execution_context_t *ec, rb_control_frame_t *cfp)
{
    /* check skipped frame */
    while (ec->cfp != cfp) {
#if VMDEBUG
        printf("skipped frame: %s\n", vm_frametype_name(ec->cfp));
#endif
        if (VM_FRAME_TYPE(ec->cfp) != VM_FRAME_MAGIC_CFUNC) {
            rb_vm_pop_frame(ec);
        }
        else { /* unlikely path */
            rb_vm_pop_cfunc_frame();
        }
    }
}
 
/* at exit */
 
void
ruby_vm_at_exit(void (*func)(rb_vm_t *))
{
    rb_vm_t *vm = GET_VM();
    rb_at_exit_list *nl = ALLOC(rb_at_exit_list);
    nl->func = func;
    nl->next = vm->at_exit;
    vm->at_exit = nl;
}
 
static void
ruby_vm_run_at_exit_hooks(rb_vm_t *vm)
{
    rb_at_exit_list *l = vm->at_exit;
 
    while (l) {
        rb_at_exit_list* t = l->next;
        rb_vm_at_exit_func *func = l->func;
        ruby_xfree(l);
        l = t;
        (*func)(vm);
    }
}
 
/* Env */
 
static VALUE check_env_value(const rb_env_t *env);
 
static int
check_env(const rb_env_t *env)
{
    fprintf(stderr, "---\n");
    fprintf(stderr, "envptr: %p\n", (void *)&env->ep[0]);
    fprintf(stderr, "envval: %10p ", (void *)env->ep[1]);
    dp(env->ep[1]);
    fprintf(stderr, "ep:    %10p\n", (void *)env->ep);
    if (rb_vm_env_prev_env(env)) {
        fprintf(stderr, ">>\n");
        check_env_value(rb_vm_env_prev_env(env));
        fprintf(stderr, "<<\n");
    }
    return 1;
}
 
static VALUE
check_env_value(const rb_env_t *env)
{
    if (check_env(env)) {
        return (VALUE)env;
    }
    rb_bug("invalid env");
    return Qnil;                /* unreachable */
}
 
static VALUE
vm_block_handler_escape(const rb_execution_context_t *ec, VALUE block_handler)
{
    switch (vm_block_handler_type(block_handler)) {
      case block_handler_type_ifunc:
      case block_handler_type_iseq:
        return  rb_vm_make_proc(ec, VM_BH_TO_CAPT_BLOCK(block_handler), rb_cProc);
 
      case block_handler_type_symbol:
      case block_handler_type_proc:
        return block_handler;
    }
    VM_UNREACHABLE(vm_block_handler_escape);
    return Qnil;
}
 
static VALUE
vm_make_env_each(const rb_execution_context_t * const ec, rb_control_frame_t *const cfp)
{
    const VALUE * const ep = cfp->ep;
    const rb_env_t *env;
    const rb_iseq_t *env_iseq;
    VALUE *env_body, *env_ep;
    int local_size, env_size;
 
    if (VM_ENV_ESCAPED_P(ep)) {
        return VM_ENV_ENVVAL(ep);
    }
 
    if (!VM_ENV_LOCAL_P(ep)) {
        const VALUE *prev_ep = VM_ENV_PREV_EP(ep);
 
        if (!VM_ENV_ESCAPED_P(prev_ep)) {
            rb_control_frame_t *prev_cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
 
            while (prev_cfp->ep != prev_ep) {
                prev_cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(prev_cfp);
                VM_ASSERT(prev_cfp->ep != NULL);
            }
 
            vm_make_env_each(ec, prev_cfp);
            VM_FORCE_WRITE_SPECIAL_CONST(&ep[VM_ENV_DATA_INDEX_SPECVAL], VM_GUARDED_PREV_EP(prev_cfp->ep));
        }
    }
    else {
        VALUE block_handler = VM_ENV_BLOCK_HANDLER(ep);
 
        if (block_handler != VM_BLOCK_HANDLER_NONE) {
            VALUE blockprocval = vm_block_handler_escape(ec, block_handler);
            VM_STACK_ENV_WRITE(ep, VM_ENV_DATA_INDEX_SPECVAL, blockprocval);
        }
    }
 
    if (!VM_FRAME_RUBYFRAME_P(cfp)) {
        local_size = VM_ENV_DATA_SIZE;
    }
    else {
        local_size = cfp->iseq->body->local_table_size + VM_ENV_DATA_SIZE;
    }
 
    /*
     * # local variables on a stack frame (N == local_size)
     * [lvar1, lvar2, ..., lvarN, SPECVAL]
     *                            ^
     *                            ep[0]
     *
     * # moved local variables
     * [lvar1, lvar2, ..., lvarN, SPECVAL, Envval, BlockProcval (if needed)]
     *  ^                         ^
     *  env->env[0]               ep[0]
     */
 
    env_size = local_size +
               1 /* envval */;
    env_body = ALLOC_N(VALUE, env_size);
    MEMCPY(env_body, ep - (local_size - 1 /* specval */), VALUE, local_size);
 
#if 0
    for (i = 0; i < local_size; i++) {
        if (VM_FRAME_RUBYFRAME_P(cfp)) {
            /* clear value stack for GC */
            ep[-local_size + i] = 0;
        }
    }
#endif
 
    env_iseq = VM_FRAME_RUBYFRAME_P(cfp) ? cfp->iseq : NULL;
    env_ep = &env_body[local_size - 1 /* specval */];
 
    env = vm_env_new(env_ep, env_body, env_size, env_iseq);
 
    cfp->ep = env_ep;
    VM_ENV_FLAGS_SET(env_ep, VM_ENV_FLAG_ESCAPED | VM_ENV_FLAG_WB_REQUIRED);
    VM_STACK_ENV_WRITE(ep, 0, (VALUE)env);              /* GC mark */
    return (VALUE)env;
}
 
static VALUE
vm_make_env_object(const rb_execution_context_t *ec, rb_control_frame_t *cfp)
{
    VALUE envval = vm_make_env_each(ec, cfp);
 
    if (PROCDEBUG) {
        check_env_value((const rb_env_t *)envval);
    }
 
    return envval;
}
 
void
rb_vm_stack_to_heap(rb_execution_context_t *ec)
{
    rb_control_frame_t *cfp = ec->cfp;
    while ((cfp = rb_vm_get_binding_creatable_next_cfp(ec, cfp)) != 0) {
        vm_make_env_object(ec, cfp);
        cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
    }
}
 
const rb_env_t *
rb_vm_env_prev_env(const rb_env_t *env)
{
    const VALUE *ep = env->ep;
 
    if (VM_ENV_LOCAL_P(ep)) {
        return NULL;
    }
    else {
        return VM_ENV_ENVVAL_PTR(VM_ENV_PREV_EP(ep));
    }
}
 
static int
collect_local_variables_in_iseq(const rb_iseq_t *iseq, const struct local_var_list *vars)
{
    unsigned int i;
    if (!iseq) return 0;
    for (i = 0; i < iseq->body->local_table_size; i++) {
        local_var_list_add(vars, iseq->body->local_table[i]);
    }
    return 1;
}
 
static void
collect_local_variables_in_env(const rb_env_t *env, const struct local_var_list *vars)
{
    do {
        collect_local_variables_in_iseq(env->iseq, vars);
    } while ((env = rb_vm_env_prev_env(env)) != NULL);
}
 
static int
vm_collect_local_variables_in_heap(const VALUE *ep, const struct local_var_list *vars)
{
    if (VM_ENV_ESCAPED_P(ep)) {
        collect_local_variables_in_env(VM_ENV_ENVVAL_PTR(ep), vars);
        return 1;
    }
    else {
        return 0;
    }
}
 
VALUE
rb_vm_env_local_variables(const rb_env_t *env)
{
    struct local_var_list vars;
    local_var_list_init(&vars);
    collect_local_variables_in_env(env, &vars);
    return local_var_list_finish(&vars);
}
 
VALUE
rb_iseq_local_variables(const rb_iseq_t *iseq)
{
    struct local_var_list vars;
    local_var_list_init(&vars);
    while (collect_local_variables_in_iseq(iseq, &vars)) {
        iseq = iseq->body->parent_iseq;
    }
    return local_var_list_finish(&vars);
}
 
/* Proc */
 
static VALUE
vm_proc_create_from_captured(VALUE klass,
                             const struct rb_captured_block *captured,
                             enum rb_block_type block_type,
                             int8_t is_from_method, int8_t is_lambda)
{
    VALUE procval = rb_proc_alloc(klass);
    rb_proc_t *proc = RTYPEDDATA_DATA(procval);
 
    VM_ASSERT(VM_EP_IN_HEAP_P(GET_EC(), captured->ep));
 
    /* copy block */
    RB_OBJ_WRITE(procval, &proc->block.as.captured.self, captured->self);
    RB_OBJ_WRITE(procval, &proc->block.as.captured.code.val, captured->code.val);
    rb_vm_block_ep_update(procval, &proc->block, captured->ep);
 
    vm_block_type_set(&proc->block, block_type);
    proc->is_from_method = is_from_method;
    proc->is_lambda = is_lambda;
 
    return procval;
}
 
void
rb_vm_block_copy(VALUE obj, const struct rb_block *dst, const struct rb_block *src)
{
    /* copy block */
    switch (vm_block_type(src)) {
      case block_type_iseq:
      case block_type_ifunc:
        RB_OBJ_WRITE(obj, &dst->as.captured.self, src->as.captured.self);
        RB_OBJ_WRITE(obj, &dst->as.captured.code.val, src->as.captured.code.val);
        rb_vm_block_ep_update(obj, dst, src->as.captured.ep);
        break;
      case block_type_symbol:
        RB_OBJ_WRITE(obj, &dst->as.symbol, src->as.symbol);
        break;
      case block_type_proc:
        RB_OBJ_WRITE(obj, &dst->as.proc, src->as.proc);
        break;
    }
}
 
static VALUE
proc_create(VALUE klass, const struct rb_block *block, int8_t is_from_method, int8_t is_lambda)
{
    VALUE procval = rb_proc_alloc(klass);
    rb_proc_t *proc = RTYPEDDATA_DATA(procval);
 
    VM_ASSERT(VM_EP_IN_HEAP_P(GET_EC(), vm_block_ep(block)));
    rb_vm_block_copy(procval, &proc->block, block);
    vm_block_type_set(&proc->block, block->type);
    proc->is_from_method = is_from_method;
    proc->is_lambda = is_lambda;
 
    return procval;
}
 
VALUE
rb_proc_dup(VALUE self)
{
    VALUE procval;
    rb_proc_t *src;
 
    GetProcPtr(self, src);
    procval = proc_create(rb_cProc, &src->block, src->is_from_method, src->is_lambda);
    RB_GC_GUARD(self); /* for: body = rb_proc_dup(body) */
    return procval;
}
 
 
MJIT_FUNC_EXPORTED VALUE
rb_vm_make_proc_lambda(const rb_execution_context_t *ec, const struct rb_captured_block *captured, VALUE klass, int8_t is_lambda)
{
    VALUE procval;
 
    if (!VM_ENV_ESCAPED_P(captured->ep)) {
        rb_control_frame_t *cfp = VM_CAPTURED_BLOCK_TO_CFP(captured);
        vm_make_env_object(ec, cfp);
    }
    VM_ASSERT(VM_EP_IN_HEAP_P(ec, captured->ep));
    VM_ASSERT(imemo_type_p(captured->code.val, imemo_iseq) ||
              imemo_type_p(captured->code.val, imemo_ifunc));
 
    procval = vm_proc_create_from_captured(klass, captured,
                                           imemo_type(captured->code.val) == imemo_iseq ? block_type_iseq : block_type_ifunc, FALSE, is_lambda);
    return procval;
}
 
/* Binding */
 
VALUE
rb_vm_make_binding(const rb_execution_context_t *ec, const rb_control_frame_t *src_cfp)
{
    rb_control_frame_t *cfp = rb_vm_get_binding_creatable_next_cfp(ec, src_cfp);
    rb_control_frame_t *ruby_level_cfp = rb_vm_get_ruby_level_next_cfp(ec, src_cfp);
    VALUE bindval, envval;
    rb_binding_t *bind;
 
    if (cfp == 0 || ruby_level_cfp == 0) {
        rb_raise(rb_eRuntimeError, "Can't create Binding Object on top of Fiber.");
    }
 
    while (1) {
        envval = vm_make_env_object(ec, cfp);
        if (cfp == ruby_level_cfp) {
            break;
        }
        cfp = rb_vm_get_binding_creatable_next_cfp(ec, RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp));
    }
 
    bindval = rb_binding_alloc(rb_cBinding);
    GetBindingPtr(bindval, bind);
    vm_bind_update_env(bindval, bind, envval);
    RB_OBJ_WRITE(bindval, &bind->block.as.captured.self, cfp->self);
    RB_OBJ_WRITE(bindval, &bind->block.as.captured.code.iseq, cfp->iseq);
    RB_OBJ_WRITE(bindval, &bind->pathobj, ruby_level_cfp->iseq->body->location.pathobj);
    bind->first_lineno = rb_vm_get_sourceline(ruby_level_cfp);
 
    return bindval;
}
 
const VALUE *
rb_binding_add_dynavars(VALUE bindval, rb_binding_t *bind, int dyncount, const ID *dynvars)
{
    VALUE envval, pathobj = bind->pathobj;
    VALUE path = pathobj_path(pathobj);
    VALUE realpath = pathobj_realpath(pathobj);
    const struct rb_block *base_block;
    const rb_env_t *env;
    rb_execution_context_t *ec = GET_EC();
    const rb_iseq_t *base_iseq, *iseq;
    rb_ast_body_t ast;
    NODE tmp_node;
    ID minibuf[4], *dyns = minibuf;
    VALUE idtmp = 0;
 
    if (dyncount < 0) return 0;
 
    base_block = &bind->block;
    base_iseq = vm_block_iseq(base_block);
 
    if (dyncount >= numberof(minibuf)) dyns = ALLOCV_N(ID, idtmp, dyncount + 1);
 
    dyns[0] = dyncount;
    MEMCPY(dyns + 1, dynvars, ID, dyncount);
    rb_node_init(&tmp_node, NODE_SCOPE, (VALUE)dyns, 0, 0);
    ast.root = &tmp_node;
    ast.compile_option = 0;
    ast.line_count = -1;
 
    if (base_iseq) {
        iseq = rb_iseq_new(&ast, base_iseq->body->location.label, path, realpath, base_iseq, ISEQ_TYPE_EVAL);
    }
    else {
        VALUE tempstr = rb_fstring_lit("<temp>");
        iseq = rb_iseq_new_top(&ast, tempstr, tempstr, tempstr, NULL);
    }
    tmp_node.nd_tbl = 0; /* reset table */
    ALLOCV_END(idtmp);
 
    vm_set_eval_stack(ec, iseq, 0, base_block);
    vm_bind_update_env(bindval, bind, envval = vm_make_env_object(ec, ec->cfp));
    rb_vm_pop_frame(ec);
 
    env = (const rb_env_t *)envval;
    return env->env;
}
 
/* C -> Ruby: block */
 
static inline VALUE
invoke_block(rb_execution_context_t *ec, const rb_iseq_t *iseq, VALUE self, const struct rb_captured_block *captured, const rb_cref_t *cref, VALUE type, int opt_pc)
{
    int arg_size = iseq->body->param.size;
 
    vm_push_frame(ec, iseq, type | VM_FRAME_FLAG_FINISH, self,
                  VM_GUARDED_PREV_EP(captured->ep),
                  (VALUE)cref, /* cref or method */
                  iseq->body->iseq_encoded + opt_pc,
                  ec->cfp->sp + arg_size,
                  iseq->body->local_table_size - arg_size,
                  iseq->body->stack_max);
    return vm_exec(ec, TRUE);
}
 
static VALUE
invoke_bmethod(rb_execution_context_t *ec, const rb_iseq_t *iseq, VALUE self, const struct rb_captured_block *captured, const rb_callable_method_entry_t *me, VALUE type, int opt_pc)
{
    /* bmethod */
    int arg_size = iseq->body->param.size;
    VALUE ret;
    rb_hook_list_t *hooks;
 
    VM_ASSERT(me->def->type == VM_METHOD_TYPE_BMETHOD);
 
    vm_push_frame(ec, iseq, type | VM_FRAME_FLAG_BMETHOD, self,
                  VM_GUARDED_PREV_EP(captured->ep),
                  (VALUE)me,
                  iseq->body->iseq_encoded + opt_pc,
                  ec->cfp->sp + arg_size,
                  iseq->body->local_table_size - arg_size,
                  iseq->body->stack_max);
 
    RUBY_DTRACE_METHOD_ENTRY_HOOK(ec, me->owner, me->def->original_id);
    EXEC_EVENT_HOOK(ec, RUBY_EVENT_CALL, self, me->def->original_id, me->called_id, me->owner, Qnil);
 
    if (UNLIKELY((hooks = me->def->body.bmethod.hooks) != NULL) &&
        hooks->events & RUBY_EVENT_CALL) {
        rb_exec_event_hook_orig(ec, hooks, RUBY_EVENT_CALL, self,
                                me->def->original_id, me->called_id, me->owner, Qnil, FALSE);
    }
    VM_ENV_FLAGS_SET(ec->cfp->ep, VM_FRAME_FLAG_FINISH);
    ret = vm_exec(ec, TRUE);
 
    EXEC_EVENT_HOOK(ec, RUBY_EVENT_RETURN, self, me->def->original_id, me->called_id, me->owner, ret);
    if ((hooks = me->def->body.bmethod.hooks) != NULL &&
        hooks->events & RUBY_EVENT_RETURN) {
        rb_exec_event_hook_orig(ec, hooks, RUBY_EVENT_RETURN, self,
                                me->def->original_id, me->called_id, me->owner, ret, FALSE);
    }
    RUBY_DTRACE_METHOD_RETURN_HOOK(ec, me->owner, me->def->original_id);
    return ret;
}
 
ALWAYS_INLINE(static VALUE
              invoke_iseq_block_from_c(rb_execution_context_t *ec, const struct rb_captured_block *captured,
                                       VALUE self, int argc, const VALUE *argv, int kw_splat, VALUE passed_block_handler,
                                       const rb_cref_t *cref, int is_lambda, const rb_callable_method_entry_t *me));
 
static inline VALUE
invoke_iseq_block_from_c(rb_execution_context_t *ec, const struct rb_captured_block *captured,
                         VALUE self, int argc, const VALUE *argv, int kw_splat, VALUE passed_block_handler,
                         const rb_cref_t *cref, int is_lambda, const rb_callable_method_entry_t *me)
{
    const rb_iseq_t *iseq = rb_iseq_check(captured->code.iseq);
    int i, opt_pc;
    VALUE type = VM_FRAME_MAGIC_BLOCK | (is_lambda ? VM_FRAME_FLAG_LAMBDA : 0);
    rb_control_frame_t *cfp = ec->cfp;
    VALUE *sp = cfp->sp;
 
    stack_check(ec);
 
    CHECK_VM_STACK_OVERFLOW(cfp, argc);
    vm_check_canary(ec, sp);
    cfp->sp = sp + argc;
    for (i=0; i<argc; i++) {
        sp[i] = argv[i];
    }
 
    opt_pc = vm_yield_setup_args(ec, iseq, argc, sp, kw_splat, passed_block_handler,
                                 (is_lambda ? arg_setup_method : arg_setup_block));
    cfp->sp = sp;
 
    if (me == NULL) {
        return invoke_block(ec, iseq, self, captured, cref, type, opt_pc);
    }
    else {
        return invoke_bmethod(ec, iseq, self, captured, me, type, opt_pc);
    }
}
 
static inline VALUE
invoke_block_from_c_bh(rb_execution_context_t *ec, VALUE block_handler,
                       int argc, const VALUE *argv,
                       int kw_splat, VALUE passed_block_handler, const rb_cref_t *cref,
                       int is_lambda, int force_blockarg)
{
  again:
    switch (vm_block_handler_type(block_handler)) {
      case block_handler_type_iseq:
        {
            const struct rb_captured_block *captured = VM_BH_TO_ISEQ_BLOCK(block_handler);
            return invoke_iseq_block_from_c(ec, captured, captured->self,
                                            argc, argv, kw_splat, passed_block_handler,
                                            cref, is_lambda, NULL);
        }
      case block_handler_type_ifunc:
        return vm_yield_with_cfunc(ec, VM_BH_TO_IFUNC_BLOCK(block_handler),
                                   VM_BH_TO_IFUNC_BLOCK(block_handler)->self,
                                   argc, argv, kw_splat, passed_block_handler, NULL);
      case block_handler_type_symbol:
        return vm_yield_with_symbol(ec, VM_BH_TO_SYMBOL(block_handler),
                                    argc, argv, kw_splat, passed_block_handler);
      case block_handler_type_proc:
        if (force_blockarg == FALSE) {
            is_lambda = block_proc_is_lambda(VM_BH_TO_PROC(block_handler));
        }
        block_handler = vm_proc_to_block_handler(VM_BH_TO_PROC(block_handler));
        goto again;
    }
    VM_UNREACHABLE(invoke_block_from_c_splattable);
    return Qundef;
}
 
static inline VALUE
check_block_handler(rb_execution_context_t *ec)
{
    VALUE block_handler = VM_CF_BLOCK_HANDLER(ec->cfp);
    vm_block_handler_verify(block_handler);
    if (UNLIKELY(block_handler == VM_BLOCK_HANDLER_NONE)) {
        rb_vm_localjump_error("no block given", Qnil, 0);
    }
 
    return block_handler;
}
 
static VALUE
vm_yield_with_cref(rb_execution_context_t *ec, int argc, const VALUE *argv, int kw_splat, const rb_cref_t *cref, int is_lambda)
{
    return invoke_block_from_c_bh(ec, check_block_handler(ec),
                                  argc, argv, kw_splat, VM_BLOCK_HANDLER_NONE,
                                  cref, is_lambda, FALSE);
}
 
static VALUE
vm_yield(rb_execution_context_t *ec, int argc, const VALUE *argv, int kw_splat)
{
    return invoke_block_from_c_bh(ec, check_block_handler(ec),
                                  argc, argv, kw_splat, VM_BLOCK_HANDLER_NONE,
                                  NULL, FALSE, FALSE);
}
 
static VALUE
vm_yield_with_block(rb_execution_context_t *ec, int argc, const VALUE *argv, VALUE block_handler, int kw_splat)
{
    return invoke_block_from_c_bh(ec, check_block_handler(ec),
                                  argc, argv, kw_splat, block_handler,
                                  NULL, FALSE, FALSE);
}
 
static VALUE
vm_yield_force_blockarg(rb_execution_context_t *ec, VALUE args)
{
    return invoke_block_from_c_bh(ec, check_block_handler(ec), 1, &args,
                                  RB_NO_KEYWORDS, VM_BLOCK_HANDLER_NONE, NULL, FALSE, TRUE);
}
 
ALWAYS_INLINE(static VALUE
              invoke_block_from_c_proc(rb_execution_context_t *ec, const rb_proc_t *proc,
                                       VALUE self, int argc, const VALUE *argv,
                                       int kw_splat, VALUE passed_block_handler, int is_lambda,
                                       const rb_callable_method_entry_t *me));
 
static inline VALUE
invoke_block_from_c_proc(rb_execution_context_t *ec, const rb_proc_t *proc,
                         VALUE self, int argc, const VALUE *argv,
                         int kw_splat, VALUE passed_block_handler, int is_lambda,
                         const rb_callable_method_entry_t *me)
{
    const struct rb_block *block = &proc->block;
 
  again:
    switch (vm_block_type(block)) {
      case block_type_iseq:
        return invoke_iseq_block_from_c(ec, &block->as.captured, self, argc, argv, kw_splat, passed_block_handler, NULL, is_lambda, me);
      case block_type_ifunc:
        if (kw_splat == 1 && RHASH_EMPTY_P(argv[argc-1])) {
            argc--;
            kw_splat = 2;
        }
        return vm_yield_with_cfunc(ec, &block->as.captured, self, argc, argv, kw_splat, passed_block_handler, me);
      case block_type_symbol:
        return vm_yield_with_symbol(ec, block->as.symbol, argc, argv, kw_splat, passed_block_handler);
      case block_type_proc:
        is_lambda = block_proc_is_lambda(block->as.proc);
        block = vm_proc_block(block->as.proc);
        goto again;
    }
    VM_UNREACHABLE(invoke_block_from_c_proc);
    return Qundef;
}
 
static VALUE
vm_invoke_proc(rb_execution_context_t *ec, rb_proc_t *proc, VALUE self,
               int argc, const VALUE *argv, int kw_splat, VALUE passed_block_handler)
{
    return invoke_block_from_c_proc(ec, proc, self, argc, argv, kw_splat, passed_block_handler, proc->is_lambda, NULL);
}
 
MJIT_FUNC_EXPORTED VALUE
rb_vm_invoke_bmethod(rb_execution_context_t *ec, rb_proc_t *proc, VALUE self,
                     int argc, const VALUE *argv, int kw_splat, VALUE block_handler, const rb_callable_method_entry_t *me)
{
    return invoke_block_from_c_proc(ec, proc, self, argc, argv, kw_splat, block_handler, TRUE, me);
}
 
MJIT_FUNC_EXPORTED VALUE
rb_vm_invoke_proc(rb_execution_context_t *ec, rb_proc_t *proc,
                  int argc, const VALUE *argv, int kw_splat, VALUE passed_block_handler)
{
    VALUE self = vm_block_self(&proc->block);
    vm_block_handler_verify(passed_block_handler);
 
    if (proc->is_from_method) {
        return rb_vm_invoke_bmethod(ec, proc, self, argc, argv, kw_splat, passed_block_handler, NULL);
    }
    else {
        return vm_invoke_proc(ec, proc, self, argc, argv, kw_splat, passed_block_handler);
    }
}
 
/* special variable */
 
static rb_control_frame_t *
vm_normal_frame(const rb_execution_context_t *ec, rb_control_frame_t *cfp)
{
    while (cfp->pc == 0) {
        cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
        if (RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(ec, cfp)) {
            return 0;
        }
    }
    return cfp;
}
 
static VALUE
vm_cfp_svar_get(const rb_execution_context_t *ec, rb_control_frame_t *cfp, VALUE key)
{
    cfp = vm_normal_frame(ec, cfp);
    return lep_svar_get(ec, cfp ? VM_CF_LEP(cfp) : 0, key);
}
 
static void
vm_cfp_svar_set(const rb_execution_context_t *ec, rb_control_frame_t *cfp, VALUE key, const VALUE val)
{
    cfp = vm_normal_frame(ec, cfp);
    lep_svar_set(ec, cfp ? VM_CF_LEP(cfp) : 0, key, val);
}
 
static VALUE
vm_svar_get(const rb_execution_context_t *ec, VALUE key)
{
    return vm_cfp_svar_get(ec, ec->cfp, key);
}
 
static void
vm_svar_set(const rb_execution_context_t *ec, VALUE key, VALUE val)
{
    vm_cfp_svar_set(ec, ec->cfp, key, val);
}
 
VALUE
rb_backref_get(void)
{
    return vm_svar_get(GET_EC(), VM_SVAR_BACKREF);
}
 
void
rb_backref_set(VALUE val)
{
    vm_svar_set(GET_EC(), VM_SVAR_BACKREF, val);
}
 
VALUE
rb_lastline_get(void)
{
    return vm_svar_get(GET_EC(), VM_SVAR_LASTLINE);
}
 
void
rb_lastline_set(VALUE val)
{
    vm_svar_set(GET_EC(), VM_SVAR_LASTLINE, val);
}
 
/* misc */
 
/* in intern.h */
const char *
rb_sourcefile(void)
{
    const rb_execution_context_t *ec = GET_EC();
    const rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp);
 
    if (cfp) {
        return RSTRING_PTR(rb_iseq_path(cfp->iseq));
    }
    else {
        return 0;
    }
}
 
/* in intern.h */
int
rb_sourceline(void)
{
    const rb_execution_context_t *ec = GET_EC();
    const rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp);
 
    if (cfp) {
        return rb_vm_get_sourceline(cfp);
    }
    else {
        return 0;
    }
}
 
VALUE
rb_source_location(int *pline)
{
    const rb_execution_context_t *ec = GET_EC();
    const rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp);
 
    if (cfp && VM_FRAME_RUBYFRAME_P(cfp)) {
        if (pline) *pline = rb_vm_get_sourceline(cfp);
        return rb_iseq_path(cfp->iseq);
    }
    else {
        if (pline) *pline = 0;
        return Qnil;
    }
}
 
MJIT_FUNC_EXPORTED const char *
rb_source_location_cstr(int *pline)
{
    VALUE path = rb_source_location(pline);
    if (NIL_P(path)) return NULL;
    return RSTRING_PTR(path);
}
 
rb_cref_t *
rb_vm_cref(void)
{
    const rb_execution_context_t *ec = GET_EC();
    return vm_ec_cref(ec);
}
 
rb_cref_t *
rb_vm_cref_replace_with_duplicated_cref(void)
{
    const rb_execution_context_t *ec = GET_EC();
    const rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp);
    rb_cref_t *cref = vm_cref_replace_with_duplicated_cref(cfp->ep);
    return cref;
}
 
const rb_cref_t *
rb_vm_cref_in_context(VALUE self, VALUE cbase)
{
    const rb_execution_context_t *ec = GET_EC();
    const rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp);
    const rb_cref_t *cref;
    if (!cfp || cfp->self != self) return NULL;
    if (!vm_env_cref_by_cref(cfp->ep)) return NULL;
    cref = vm_get_cref(cfp->ep);
    if (CREF_CLASS(cref) != cbase) return NULL;
    return cref;
}
 
#if 0
void
debug_cref(rb_cref_t *cref)
{
    while (cref) {
        dp(CREF_CLASS(cref));
        printf("%ld\n", CREF_VISI(cref));
        cref = CREF_NEXT(cref);
    }
}
#endif
 
VALUE
rb_vm_cbase(void)
{
    const rb_execution_context_t *ec = GET_EC();
    const rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp);
 
    if (cfp == 0) {
        rb_raise(rb_eRuntimeError, "Can't call on top of Fiber or Thread");
    }
    return vm_get_cbase(cfp->ep);
}
 
/* jump */
 
static VALUE
make_localjump_error(const char *mesg, VALUE value, int reason)
{
    extern VALUE rb_eLocalJumpError;
    VALUE exc = rb_exc_new2(rb_eLocalJumpError, mesg);
    ID id;
 
    switch (reason) {
      case TAG_BREAK:
        CONST_ID(id, "break");
        break;
      case TAG_REDO:
        CONST_ID(id, "redo");
        break;
      case TAG_RETRY:
        CONST_ID(id, "retry");
        break;
      case TAG_NEXT:
        CONST_ID(id, "next");
        break;
      case TAG_RETURN:
        CONST_ID(id, "return");
        break;
      default:
        CONST_ID(id, "noreason");
        break;
    }
    rb_iv_set(exc, "@exit_value", value);
    rb_iv_set(exc, "@reason", ID2SYM(id));
    return exc;
}
 
MJIT_FUNC_EXPORTED void
rb_vm_localjump_error(const char *mesg, VALUE value, int reason)
{
    VALUE exc = make_localjump_error(mesg, value, reason);
    rb_exc_raise(exc);
}
 
VALUE
rb_vm_make_jump_tag_but_local_jump(int state, VALUE val)
{
    const char *mesg;
 
    switch (state) {
      case TAG_RETURN:
        mesg = "unexpected return";
        break;
      case TAG_BREAK:
        mesg = "unexpected break";
        break;
      case TAG_NEXT:
        mesg = "unexpected next";
        break;
      case TAG_REDO:
        mesg = "unexpected redo";
        val = Qnil;
        break;
      case TAG_RETRY:
        mesg = "retry outside of rescue clause";
        val = Qnil;
        break;
      default:
        return Qnil;
    }
    if (val == Qundef) {
        val = GET_EC()->tag->retval;
    }
    return make_localjump_error(mesg, val, state);
}
 
void
rb_vm_jump_tag_but_local_jump(int state)
{
    VALUE exc = rb_vm_make_jump_tag_but_local_jump(state, Qundef);
    if (!NIL_P(exc)) rb_exc_raise(exc);
    EC_JUMP_TAG(GET_EC(), state);
}
 
static rb_control_frame_t *
next_not_local_frame(rb_control_frame_t *cfp)
{
    while (VM_ENV_LOCAL_P(cfp->ep)) {
        cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
    }
    return cfp;
}
 
NORETURN(static void vm_iter_break(rb_execution_context_t *ec, VALUE val));
 
static void
vm_iter_break(rb_execution_context_t *ec, VALUE val)
{
    rb_control_frame_t *cfp = next_not_local_frame(ec->cfp);
    const VALUE *ep = VM_CF_PREV_EP(cfp);
    const rb_control_frame_t *target_cfp = rb_vm_search_cf_from_ep(ec, cfp, ep);
 
#if 0                           /* raise LocalJumpError */
    if (!target_cfp) {
        rb_vm_localjump_error("unexpected break", val, TAG_BREAK);
    }
#endif
 
    ec->errinfo = (VALUE)THROW_DATA_NEW(val, target_cfp, TAG_BREAK);
    EC_JUMP_TAG(ec, TAG_BREAK);
}
 
void
rb_iter_break(void)
{
    vm_iter_break(GET_EC(), Qnil);
}
 
void
rb_iter_break_value(VALUE val)
{
    vm_iter_break(GET_EC(), val);
}
 
/* optimization: redefine management */
 
static st_table *vm_opt_method_table = 0;
static st_table *vm_opt_mid_table = 0;
 
static int
vm_redefinition_check_flag(VALUE klass)
{
    if (klass == rb_cInteger) return INTEGER_REDEFINED_OP_FLAG;
    if (klass == rb_cFloat)  return FLOAT_REDEFINED_OP_FLAG;
    if (klass == rb_cString) return STRING_REDEFINED_OP_FLAG;
    if (klass == rb_cArray)  return ARRAY_REDEFINED_OP_FLAG;
    if (klass == rb_cHash)   return HASH_REDEFINED_OP_FLAG;
    if (klass == rb_cSymbol) return SYMBOL_REDEFINED_OP_FLAG;
    if (klass == rb_cTime)   return TIME_REDEFINED_OP_FLAG;
    if (klass == rb_cRegexp) return REGEXP_REDEFINED_OP_FLAG;
    if (klass == rb_cNilClass) return NIL_REDEFINED_OP_FLAG;
    if (klass == rb_cTrueClass) return TRUE_REDEFINED_OP_FLAG;
    if (klass == rb_cFalseClass) return FALSE_REDEFINED_OP_FLAG;
    if (klass == rb_cProc) return PROC_REDEFINED_OP_FLAG;
    return 0;
}
 
int
rb_vm_check_optimizable_mid(VALUE mid)
{
    if (!vm_opt_mid_table) {
      return FALSE;
    }
 
    return st_lookup(vm_opt_mid_table, mid, NULL);
}
 
static int
vm_redefinition_check_method_type(const rb_method_definition_t *def)
{
    switch (def->type) {
      case VM_METHOD_TYPE_CFUNC:
      case VM_METHOD_TYPE_OPTIMIZED:
        return TRUE;
      default:
        return FALSE;
    }
}
 
static void
rb_vm_check_redefinition_opt_method(const rb_method_entry_t *me, VALUE klass)
{
    st_data_t bop;
    if (RB_TYPE_P(klass, T_ICLASS) && FL_TEST(klass, RICLASS_IS_ORIGIN)) {
       klass = RBASIC_CLASS(klass);
    }
    if (vm_redefinition_check_method_type(me->def)) {
        if (st_lookup(vm_opt_method_table, (st_data_t)me, &bop)) {
            int flag = vm_redefinition_check_flag(klass);
 
            ruby_vm_redefined_flag[bop] |= flag;
        }
    }
}
 
static enum rb_id_table_iterator_result
check_redefined_method(ID mid, VALUE value, void *data)
{
    VALUE klass = (VALUE)data;
    const rb_method_entry_t *me = (rb_method_entry_t *)value;
    const rb_method_entry_t *newme = rb_method_entry(klass, mid);
 
    if (newme != me) rb_vm_check_redefinition_opt_method(me, me->owner);
 
    return ID_TABLE_CONTINUE;
}
 
void
rb_vm_check_redefinition_by_prepend(VALUE klass)
{
    if (!vm_redefinition_check_flag(klass)) return;
    rb_id_table_foreach(RCLASS_M_TBL(RCLASS_ORIGIN(klass)), check_redefined_method, (void *)klass);
}
 
static void
add_opt_method(VALUE klass, ID mid, VALUE bop)
{
    const rb_method_entry_t *me = rb_method_entry_at(klass, mid);
 
    if (me && vm_redefinition_check_method_type(me->def)) {
        st_insert(vm_opt_method_table, (st_data_t)me, (st_data_t)bop);
        st_insert(vm_opt_mid_table, (st_data_t)mid, (st_data_t)Qtrue);
    }
    else {
        rb_bug("undefined optimized method: %s", rb_id2name(mid));
    }
}
 
static void
vm_init_redefined_flag(void)
{
    ID mid;
    VALUE bop;
 
    vm_opt_method_table = st_init_numtable();
    vm_opt_mid_table = st_init_numtable();
 
#define OP(mid_, bop_) (mid = id##mid_, bop = BOP_##bop_, ruby_vm_redefined_flag[bop] = 0)
#define C(k) add_opt_method(rb_c##k, mid, bop)
    OP(PLUS, PLUS), (C(Integer), C(Float), C(String), C(Array));
    OP(MINUS, MINUS), (C(Integer), C(Float));
    OP(MULT, MULT), (C(Integer), C(Float));
    OP(DIV, DIV), (C(Integer), C(Float));
    OP(MOD, MOD), (C(Integer), C(Float));
    OP(Eq, EQ), (C(Integer), C(Float), C(String), C(Symbol));
    OP(Eqq, EQQ), (C(Integer), C(Float), C(Symbol), C(String),
                   C(NilClass), C(TrueClass), C(FalseClass));
    OP(LT, LT), (C(Integer), C(Float));
    OP(LE, LE), (C(Integer), C(Float));
    OP(GT, GT), (C(Integer), C(Float));
    OP(GE, GE), (C(Integer), C(Float));
    OP(LTLT, LTLT), (C(String), C(Array));
    OP(AREF, AREF), (C(Array), C(Hash), C(Integer));
    OP(ASET, ASET), (C(Array), C(Hash));
    OP(Length, LENGTH), (C(Array), C(String), C(Hash));
    OP(Size, SIZE), (C(Array), C(String), C(Hash));
    OP(EmptyP, EMPTY_P), (C(Array), C(String), C(Hash));
    OP(Succ, SUCC), (C(Integer), C(String), C(Time));
    OP(EqTilde, MATCH), (C(Regexp), C(String));
    OP(Freeze, FREEZE), (C(String));
    OP(UMinus, UMINUS), (C(String));
    OP(Max, MAX), (C(Array));
    OP(Min, MIN), (C(Array));
    OP(Call, CALL), (C(Proc));
    OP(And, AND), (C(Integer));
    OP(Or, OR), (C(Integer));
    OP(NilP, NIL_P), (C(NilClass));
#undef C
#undef OP
}
 
/* for vm development */
 
#if VMDEBUG
static const char *
vm_frametype_name(const rb_control_frame_t *cfp)
{
    switch (VM_FRAME_TYPE(cfp)) {
      case VM_FRAME_MAGIC_METHOD: return "method";
      case VM_FRAME_MAGIC_BLOCK:  return "block";
      case VM_FRAME_MAGIC_CLASS:  return "class";
      case VM_FRAME_MAGIC_TOP:    return "top";
      case VM_FRAME_MAGIC_CFUNC:  return "cfunc";
      case VM_FRAME_MAGIC_IFUNC:  return "ifunc";
      case VM_FRAME_MAGIC_EVAL:   return "eval";
      case VM_FRAME_MAGIC_RESCUE: return "rescue";
      default:
        rb_bug("unknown frame");
    }
}
#endif
 
static VALUE
frame_return_value(const struct vm_throw_data *err)
{
    if (THROW_DATA_P(err) &&
        THROW_DATA_STATE(err) == TAG_BREAK &&
        THROW_DATA_CONSUMED_P(err) == FALSE) {
        return THROW_DATA_VAL(err);
    }
    else {
        return Qnil;
    }
}
 
#if 0
/* for debug */
static const char *
frame_name(const rb_control_frame_t *cfp)
{
    unsigned long type = VM_FRAME_TYPE(cfp);
#define C(t) if (type == VM_FRAME_MAGIC_##t) return #t
    C(METHOD);
    C(BLOCK);
    C(CLASS);
    C(TOP);
    C(CFUNC);
    C(PROC);
    C(IFUNC);
    C(EVAL);
    C(LAMBDA);
    C(RESCUE);
    C(DUMMY);
#undef C
    return "unknown";
}
#endif
 
static void
hook_before_rewind(rb_execution_context_t *ec, const rb_control_frame_t *cfp,
                   int will_finish_vm_exec, int state, struct vm_throw_data *err)
{
    if (state == TAG_RAISE && RBASIC_CLASS(err) == rb_eSysStackError) {
        return;
    }
    else {
        const rb_iseq_t *iseq = cfp->iseq;
        rb_hook_list_t *local_hooks = iseq->aux.exec.local_hooks;
 
        switch (VM_FRAME_TYPE(ec->cfp)) {
          case VM_FRAME_MAGIC_METHOD:
            RUBY_DTRACE_METHOD_RETURN_HOOK(ec, 0, 0);
            EXEC_EVENT_HOOK_AND_POP_FRAME(ec, RUBY_EVENT_RETURN, ec->cfp->self, 0, 0, 0, frame_return_value(err));
 
            if (UNLIKELY(local_hooks && local_hooks->events & RUBY_EVENT_RETURN)) {
                rb_exec_event_hook_orig(ec, local_hooks, RUBY_EVENT_RETURN,
                                        ec->cfp->self, 0, 0, 0, frame_return_value(err), TRUE);
            }
 
            THROW_DATA_CONSUMED_SET(err);
            break;
          case VM_FRAME_MAGIC_BLOCK:
            if (VM_FRAME_BMETHOD_P(ec->cfp)) {
                EXEC_EVENT_HOOK(ec, RUBY_EVENT_B_RETURN, ec->cfp->self, 0, 0, 0, frame_return_value(err));
                if (UNLIKELY(local_hooks && local_hooks->events & RUBY_EVENT_B_RETURN)) {
                    rb_exec_event_hook_orig(ec, local_hooks, RUBY_EVENT_B_RETURN,
                                            ec->cfp->self, 0, 0, 0, frame_return_value(err), FALSE);
                }
 
                if (!will_finish_vm_exec) {
                    const rb_callable_method_entry_t *me = rb_vm_frame_method_entry(ec->cfp);
 
                    /* kick RUBY_EVENT_RETURN at invoke_block_from_c() for bmethod */
                    EXEC_EVENT_HOOK_AND_POP_FRAME(ec, RUBY_EVENT_RETURN, ec->cfp->self,
                                                  rb_vm_frame_method_entry(ec->cfp)->def->original_id,
                                                  rb_vm_frame_method_entry(ec->cfp)->called_id,
                                                  rb_vm_frame_method_entry(ec->cfp)->owner,
                                                  frame_return_value(err));
 
                    VM_ASSERT(me->def->type == VM_METHOD_TYPE_BMETHOD);
                    local_hooks = me->def->body.bmethod.hooks;
 
                    if (UNLIKELY(local_hooks && local_hooks->events & RUBY_EVENT_RETURN)) {
                        rb_exec_event_hook_orig(ec, local_hooks, RUBY_EVENT_RETURN, ec->cfp->self,
                                                rb_vm_frame_method_entry(ec->cfp)->def->original_id,
                                                rb_vm_frame_method_entry(ec->cfp)->called_id,
                                                rb_vm_frame_method_entry(ec->cfp)->owner,
                                                frame_return_value(err), TRUE);
                    }
                }
                THROW_DATA_CONSUMED_SET(err);
            }
            else {
                EXEC_EVENT_HOOK_AND_POP_FRAME(ec, RUBY_EVENT_B_RETURN, ec->cfp->self, 0, 0, 0, frame_return_value(err));
                if (UNLIKELY(local_hooks && local_hooks->events & RUBY_EVENT_B_RETURN)) {
                    rb_exec_event_hook_orig(ec, local_hooks, RUBY_EVENT_B_RETURN,
                                            ec->cfp->self, 0, 0, 0, frame_return_value(err), TRUE);
                }
                THROW_DATA_CONSUMED_SET(err);
            }
            break;
          case VM_FRAME_MAGIC_CLASS:
            EXEC_EVENT_HOOK_AND_POP_FRAME(ec, RUBY_EVENT_END, ec->cfp->self, 0, 0, 0, Qnil);
            break;
        }
    }
}
 
/* evaluator body */
 
/*                  finish
  VMe (h1)          finish
    VM              finish F1 F2
      cfunc         finish F1 F2 C1
        rb_funcall  finish F1 F2 C1
          VMe       finish F1 F2 C1
            VM      finish F1 F2 C1 F3
 
  F1 - F3 : pushed by VM
  C1      : pushed by send insn (CFUNC)
 
  struct CONTROL_FRAME {
    VALUE *pc;                  // cfp[0], program counter
    VALUE *sp;                  // cfp[1], stack pointer
    rb_iseq_t *iseq;            // cfp[2], iseq
    VALUE self;                 // cfp[3], self
    const VALUE *ep;            // cfp[4], env pointer
    const void *block_code;     // cfp[5], block code
  };
 
  struct rb_captured_block {
    VALUE self;
    VALUE *ep;
    union code;
  };
 
  struct METHOD_ENV {
    VALUE param0;
    ...
    VALUE paramN;
    VALUE lvar1;
    ...
    VALUE lvarM;
    VALUE cref;    // ep[-2]
    VALUE special; // ep[-1]
    VALUE flags;   // ep[ 0] == lep[0]
  };
 
  struct BLOCK_ENV {
    VALUE block_param0;
    ...
    VALUE block_paramN;
    VALUE block_lvar1;
    ...
    VALUE block_lvarM;
    VALUE cref;    // ep[-2]
    VALUE special; // ep[-1]
    VALUE flags;   // ep[ 0]
  };
 
  struct CLASS_ENV {
    VALUE class_lvar0;
    ...
    VALUE class_lvarN;
    VALUE cref;
    VALUE prev_ep; // for frame jump
    VALUE flags;
  };
 
  struct C_METHOD_CONTROL_FRAME {
    VALUE *pc;                       // 0
    VALUE *sp;                       // stack pointer
    rb_iseq_t *iseq;                 // cmi
    VALUE self;                      // ?
    VALUE *ep;                       // ep == lep
    void *code;                      //
  };
 
  struct C_BLOCK_CONTROL_FRAME {
    VALUE *pc;                       // point only "finish" insn
    VALUE *sp;                       // sp
    rb_iseq_t *iseq;                 // ?
    VALUE self;                      //
    VALUE *ep;                       // ep
    void *code;                      //
  };
 
  If mjit_exec is already called before calling vm_exec, `mjit_enable_p` should
  be FALSE to avoid calling `mjit_exec` twice.
 */
 
static inline VALUE
vm_exec_handle_exception(rb_execution_context_t *ec, enum ruby_tag_type state,
                         VALUE errinfo, VALUE *initial);
 
VALUE
vm_exec(rb_execution_context_t *ec, int mjit_enable_p)
{
    enum ruby_tag_type state;
    VALUE result = Qundef;
    VALUE initial = 0;
 
    EC_PUSH_TAG(ec);
 
    _tag.retval = Qnil;
    if ((state = EC_EXEC_TAG()) == TAG_NONE) {
        if (!mjit_enable_p || (result = mjit_exec(ec)) == Qundef) {
            result = vm_exec_core(ec, initial);
        }
        goto vm_loop_start; /* fallback to the VM */
    }
    else {
        result = ec->errinfo;
        rb_ec_raised_reset(ec, RAISED_STACKOVERFLOW);
        while ((result = vm_exec_handle_exception(ec, state, result, &initial)) == Qundef) {
            /* caught a jump, exec the handler */
            result = vm_exec_core(ec, initial);
          vm_loop_start:
            VM_ASSERT(ec->tag == &_tag);
            /* when caught `throw`, `tag.state` is set. */
            if ((state = _tag.state) == TAG_NONE) break;
            _tag.state = TAG_NONE;
        }
    }
    EC_POP_TAG();
    return result;
}
 
static inline VALUE
vm_exec_handle_exception(rb_execution_context_t *ec, enum ruby_tag_type state,
                         VALUE errinfo, VALUE *initial)
{
    struct vm_throw_data *err = (struct vm_throw_data *)errinfo;
 
    for (;;) {
        unsigned int i;
        const struct iseq_catch_table_entry *entry;
        const struct iseq_catch_table *ct;
        unsigned long epc, cont_pc, cont_sp;
        const rb_iseq_t *catch_iseq;
        rb_control_frame_t *cfp;
        VALUE type;
        const rb_control_frame_t *escape_cfp;
 
        cont_pc = cont_sp = 0;
        catch_iseq = NULL;
 
        while (ec->cfp->pc == 0 || ec->cfp->iseq == 0) {
            if (UNLIKELY(VM_FRAME_TYPE(ec->cfp) == VM_FRAME_MAGIC_CFUNC)) {
                EXEC_EVENT_HOOK_AND_POP_FRAME(ec, RUBY_EVENT_C_RETURN, ec->cfp->self,
                                              rb_vm_frame_method_entry(ec->cfp)->def->original_id,
                                              rb_vm_frame_method_entry(ec->cfp)->called_id,
                                              rb_vm_frame_method_entry(ec->cfp)->owner, Qnil);
                RUBY_DTRACE_CMETHOD_RETURN_HOOK(ec,
                                                rb_vm_frame_method_entry(ec->cfp)->owner,
                                                rb_vm_frame_method_entry(ec->cfp)->def->original_id);
            }
            rb_vm_pop_frame(ec);
        }
 
        cfp = ec->cfp;
        epc = cfp->pc - cfp->iseq->body->iseq_encoded;
 
        escape_cfp = NULL;
        if (state == TAG_BREAK || state == TAG_RETURN) {
            escape_cfp = THROW_DATA_CATCH_FRAME(err);
 
            if (cfp == escape_cfp) {
                if (state == TAG_RETURN) {
                    if (!VM_FRAME_FINISHED_P(cfp)) {
                        THROW_DATA_CATCH_FRAME_SET(err, cfp + 1);
                        THROW_DATA_STATE_SET(err, state = TAG_BREAK);
                    }
                    else {
                        ct = cfp->iseq->body->catch_table;
                        if (ct) for (i = 0; i < ct->size; i++) {
                            entry = UNALIGNED_MEMBER_PTR(ct, entries[i]);
                            if (entry->start < epc && entry->end >= epc) {
                                if (entry->type == CATCH_TYPE_ENSURE) {
                                    catch_iseq = entry->iseq;
                                    cont_pc = entry->cont;
                                    cont_sp = entry->sp;
                                    break;
                                }
                            }
                        }
                        if (catch_iseq == NULL) {
                            ec->errinfo = Qnil;
                            THROW_DATA_CATCH_FRAME_SET(err, cfp + 1);
                            hook_before_rewind(ec, ec->cfp, TRUE, state, err);
                            rb_vm_pop_frame(ec);
                            return THROW_DATA_VAL(err);
                        }
                    }
                    /* through */
                }
                else {
                    /* TAG_BREAK */
#if OPT_STACK_CACHING
                    *initial = THROW_DATA_VAL(err);
#else
                    *ec->cfp->sp++ = THROW_DATA_VAL(err);
#endif
                    ec->errinfo = Qnil;
                    return Qundef;
                }
            }
        }
 
        if (state == TAG_RAISE) {
            ct = cfp->iseq->body->catch_table;
            if (ct) for (i = 0; i < ct->size; i++) {
                entry = UNALIGNED_MEMBER_PTR(ct, entries[i]);
                if (entry->start < epc && entry->end >= epc) {
 
                    if (entry->type == CATCH_TYPE_RESCUE ||
                        entry->type == CATCH_TYPE_ENSURE) {
                        catch_iseq = entry->iseq;
                        cont_pc = entry->cont;
                        cont_sp = entry->sp;
                        break;
                    }
                }
            }
        }
        else if (state == TAG_RETRY) {
            ct = cfp->iseq->body->catch_table;
            if (ct) for (i = 0; i < ct->size; i++) {
                entry = UNALIGNED_MEMBER_PTR(ct, entries[i]);
                if (entry->start < epc && entry->end >= epc) {
 
                    if (entry->type == CATCH_TYPE_ENSURE) {
                        catch_iseq = entry->iseq;
                        cont_pc = entry->cont;
                        cont_sp = entry->sp;
                        break;
                    }
                    else if (entry->type == CATCH_TYPE_RETRY) {
                        const rb_control_frame_t *escape_cfp;
                        escape_cfp = THROW_DATA_CATCH_FRAME(err);
                        if (cfp == escape_cfp) {
                            cfp->pc = cfp->iseq->body->iseq_encoded + entry->cont;
                            ec->errinfo = Qnil;
                            return Qundef;
                        }
                    }
                }
            }
        }
        else if (state == TAG_BREAK && !escape_cfp) {
            type = CATCH_TYPE_BREAK;
 
          search_restart_point:
            ct = cfp->iseq->body->catch_table;
            if (ct) for (i = 0; i < ct->size; i++) {
                entry = UNALIGNED_MEMBER_PTR(ct, entries[i]);
 
                if (entry->start < epc && entry->end >= epc) {
                    if (entry->type == CATCH_TYPE_ENSURE) {
                        catch_iseq = entry->iseq;
                        cont_pc = entry->cont;
                        cont_sp = entry->sp;
                        break;
                    }
                    else if (entry->type == type) {
                        cfp->pc = cfp->iseq->body->iseq_encoded + entry->cont;
                        cfp->sp = vm_base_ptr(cfp) + entry->sp;
 
                        if (state != TAG_REDO) {
#if OPT_STACK_CACHING
                            *initial = THROW_DATA_VAL(err);
#else
                            *ec->cfp->sp++ = THROW_DATA_VAL(err);
#endif
                        }
                        ec->errinfo = Qnil;
                        VM_ASSERT(ec->tag->state == TAG_NONE);
                        return Qundef;
                    }
                }
            }
        }
        else if (state == TAG_REDO) {
            type = CATCH_TYPE_REDO;
            goto search_restart_point;
        }
        else if (state == TAG_NEXT) {
            type = CATCH_TYPE_NEXT;
            goto search_restart_point;
        }
        else {
            ct = cfp->iseq->body->catch_table;
            if (ct) for (i = 0; i < ct->size; i++) {
                entry = UNALIGNED_MEMBER_PTR(ct, entries[i]);
                if (entry->start < epc && entry->end >= epc) {
 
                    if (entry->type == CATCH_TYPE_ENSURE) {
                        catch_iseq = entry->iseq;
                        cont_pc = entry->cont;
                        cont_sp = entry->sp;
                        break;
                    }
                }
            }
        }
 
        if (catch_iseq != NULL) { /* found catch table */
            /* enter catch scope */
            const int arg_size = 1;
 
            rb_iseq_check(catch_iseq);
            cfp->sp = vm_base_ptr(cfp) + cont_sp;
            cfp->pc = cfp->iseq->body->iseq_encoded + cont_pc;
 
            /* push block frame */
            cfp->sp[0] = (VALUE)err;
            vm_push_frame(ec, catch_iseq, VM_FRAME_MAGIC_RESCUE,
                          cfp->self,
                          VM_GUARDED_PREV_EP(cfp->ep),
                          0, /* cref or me */
                          catch_iseq->body->iseq_encoded,
                          cfp->sp + arg_size /* push value */,
                          catch_iseq->body->local_table_size - arg_size,
                          catch_iseq->body->stack_max);
 
            state = 0;
            ec->tag->state = TAG_NONE;
            ec->errinfo = Qnil;
 
            return Qundef;
        }
        else {
            hook_before_rewind(ec, ec->cfp, FALSE, state, err);
 
            if (VM_FRAME_FINISHED_P(ec->cfp)) {
                rb_vm_pop_frame(ec);
                ec->errinfo = (VALUE)err;
                ec->tag = ec->tag->prev;
                EC_JUMP_TAG(ec, state);
            }
            else {
                rb_vm_pop_frame(ec);
            }
        }
    }
}
 
/* misc */
 
VALUE
rb_iseq_eval(const rb_iseq_t *iseq)
{
    rb_execution_context_t *ec = GET_EC();
    VALUE val;
    vm_set_top_stack(ec, iseq);
    val = vm_exec(ec, TRUE);
    return val;
}
 
VALUE
rb_iseq_eval_main(const rb_iseq_t *iseq)
{
    rb_execution_context_t *ec = GET_EC();
    VALUE val;
 
    vm_set_main_stack(ec, iseq);
    val = vm_exec(ec, TRUE);
    return val;
}
 
int
rb_vm_control_frame_id_and_class(const rb_control_frame_t *cfp, ID *idp, ID *called_idp, VALUE *klassp)
{
    const rb_callable_method_entry_t *me = rb_vm_frame_method_entry(cfp);
 
    if (me) {
        if (idp) *idp = me->def->original_id;
        if (called_idp) *called_idp = me->called_id;
        if (klassp) *klassp = me->owner;
        return TRUE;
    }
    else {
        return FALSE;
    }
}
 
int
rb_ec_frame_method_id_and_class(const rb_execution_context_t *ec, ID *idp, ID *called_idp, VALUE *klassp)
{
    return rb_vm_control_frame_id_and_class(ec->cfp, idp, called_idp, klassp);
}
 
int
rb_frame_method_id_and_class(ID *idp, VALUE *klassp)
{
    return rb_ec_frame_method_id_and_class(GET_EC(), idp, 0, klassp);
}
 
VALUE
rb_vm_call_cfunc(VALUE recv, VALUE (*func)(VALUE), VALUE arg,
                 VALUE block_handler, VALUE filename)
{
    rb_execution_context_t *ec = GET_EC();
    const rb_control_frame_t *reg_cfp = ec->cfp;
    const rb_iseq_t *iseq = rb_iseq_new(0, filename, filename, Qnil, 0, ISEQ_TYPE_TOP);
    VALUE val;
 
    vm_push_frame(ec, iseq, VM_FRAME_MAGIC_TOP | VM_ENV_FLAG_LOCAL | VM_FRAME_FLAG_FINISH,
                  recv, block_handler,
                  (VALUE)vm_cref_new_toplevel(ec), /* cref or me */
                  0, reg_cfp->sp, 0, 0);
 
    val = (*func)(arg);
 
    rb_vm_pop_frame(ec);
    return val;
}
 
/* vm */
 
void
rb_vm_update_references(void *ptr)
{
    if (ptr) {
        rb_vm_t *vm = ptr;
        rb_gc_update_tbl_refs(vm->frozen_strings);
    }
}
 
void
rb_vm_mark(void *ptr)
{
    RUBY_MARK_ENTER("vm");
    RUBY_GC_INFO("-------------------------------------------------\n");
    if (ptr) {
        rb_vm_t *vm = ptr;
        rb_thread_t *th = 0;
        long i, len;
        const VALUE *obj_ary;
 
        list_for_each(&vm->living_threads, th, vmlt_node) {
            rb_gc_mark(th->self);
        }
        rb_gc_mark(vm->thgroup_default);
        rb_gc_mark(vm->mark_object_ary);
 
        len = RARRAY_LEN(vm->mark_object_ary);
        obj_ary = RARRAY_CONST_PTR(vm->mark_object_ary);
        for (i=0; i < len; i++) {
            const VALUE *ptr;
            long j, jlen;
 
            rb_gc_mark(*obj_ary);
            jlen = RARRAY_LEN(*obj_ary);
            ptr = RARRAY_CONST_PTR(*obj_ary);
            for (j=0; j < jlen; j++) {
                rb_gc_mark(*ptr++);
            }
            obj_ary++;
        }
 
        rb_gc_mark(vm->load_path);
        rb_gc_mark(vm->load_path_snapshot);
        RUBY_MARK_UNLESS_NULL(vm->load_path_check_cache);
        rb_gc_mark(vm->expanded_load_path);
        rb_gc_mark(vm->loaded_features);
        rb_gc_mark(vm->loaded_features_snapshot);
        rb_gc_mark(vm->top_self);
        rb_gc_mark(vm->orig_progname);
        RUBY_MARK_UNLESS_NULL(vm->coverages);
        /* Prevent classes from moving */
        rb_mark_tbl(vm->defined_module_hash);
 
        if (vm->loading_table) {
            rb_mark_tbl(vm->loading_table);
        }
 
        rb_hook_list_mark(&vm->global_hooks);
 
        rb_gc_mark_values(RUBY_NSIG, vm->trap_list.cmd);
 
        mjit_mark();
    }
 
    RUBY_MARK_LEAVE("vm");
}
 
#undef rb_vm_register_special_exception
void
rb_vm_register_special_exception_str(enum ruby_special_exceptions sp, VALUE cls, VALUE mesg)
{
    rb_vm_t *vm = GET_VM();
    VALUE exc = rb_exc_new3(cls, rb_obj_freeze(mesg));
    OBJ_FREEZE(exc);
    ((VALUE *)vm->special_exceptions)[sp] = exc;
    rb_gc_register_mark_object(exc);
}
 
int
rb_vm_add_root_module(ID id, VALUE module)
{
    rb_vm_t *vm = GET_VM();
 
    st_insert(vm->defined_module_hash, (st_data_t)module, (st_data_t)module);
 
    return TRUE;
}
 
static int
free_loading_table_entry(st_data_t key, st_data_t value, st_data_t arg)
{
    xfree((char *)key);
    return ST_DELETE;
}
 
int
ruby_vm_destruct(rb_vm_t *vm)
{
    RUBY_FREE_ENTER("vm");
 
    if (vm) {
        rb_thread_t *th = vm->main_thread;
        struct rb_objspace *objspace = vm->objspace;
        vm->main_thread = 0;
        if (th) {
            rb_fiber_reset_root_local_storage(th);
            thread_free(th);
        }
        rb_vm_living_threads_init(vm);
        ruby_vm_run_at_exit_hooks(vm);
        if (vm->loading_table) {
            st_foreach(vm->loading_table, free_loading_table_entry, 0);
            st_free_table(vm->loading_table);
            vm->loading_table = 0;
        }
        if (vm->frozen_strings) {
            st_free_table(vm->frozen_strings);
            vm->frozen_strings = 0;
        }
        rb_vm_gvl_destroy(vm);
        RB_ALTSTACK_FREE(vm->main_altstack);
        if (objspace) {
            rb_objspace_free(objspace);
        }
        /* after freeing objspace, you *can't* use ruby_xfree() */
        ruby_mimfree(vm);
        ruby_current_vm_ptr = NULL;
    }
    RUBY_FREE_LEAVE("vm");
    return 0;
}
 
static size_t
vm_memsize(const void *ptr)
{
    const rb_vm_t *vmobj = ptr;
    size_t size = sizeof(rb_vm_t);
 
    size += vmobj->living_thread_num * sizeof(rb_thread_t);
 
    if (vmobj->defined_strings) {
        size += DEFINED_EXPR * sizeof(VALUE);
    }
    return size;
}
 
static const rb_data_type_t vm_data_type = {
    "VM",
    {NULL, NULL, vm_memsize,},
    0, 0, RUBY_TYPED_FREE_IMMEDIATELY
};
 
 
static VALUE
vm_default_params(void)
{
    rb_vm_t *vm = GET_VM();
    VALUE result = rb_hash_new_with_size(4);
#define SET(name) rb_hash_aset(result, ID2SYM(rb_intern(#name)), SIZET2NUM(vm->default_params.name));
    SET(thread_vm_stack_size);
    SET(thread_machine_stack_size);
    SET(fiber_vm_stack_size);
    SET(fiber_machine_stack_size);
#undef SET
    rb_obj_freeze(result);
    return result;
}
 
static size_t
get_param(const char *name, size_t default_value, size_t min_value)
{
    const char *envval;
    size_t result = default_value;
    if ((envval = getenv(name)) != 0) {
        long val = atol(envval);
        if (val < (long)min_value) {
            val = (long)min_value;
        }
        result = (size_t)(((val -1 + RUBY_VM_SIZE_ALIGN) / RUBY_VM_SIZE_ALIGN) * RUBY_VM_SIZE_ALIGN);
    }
    if (0) fprintf(stderr, "%s: %"PRIuSIZE"\n", name, result); /* debug print */
 
    return result;
}
 
static void
check_machine_stack_size(size_t *sizep)
{
#ifdef PTHREAD_STACK_MIN
    size_t size = *sizep;
#endif
 
#ifdef PTHREAD_STACK_MIN
    if (size < PTHREAD_STACK_MIN) {
        *sizep = PTHREAD_STACK_MIN * 2;
    }
#endif
}
 
static void
vm_default_params_setup(rb_vm_t *vm)
{
    vm->default_params.thread_vm_stack_size =
      get_param("RUBY_THREAD_VM_STACK_SIZE",
                RUBY_VM_THREAD_VM_STACK_SIZE,
                RUBY_VM_THREAD_VM_STACK_SIZE_MIN);
 
    vm->default_params.thread_machine_stack_size =
      get_param("RUBY_THREAD_MACHINE_STACK_SIZE",
                RUBY_VM_THREAD_MACHINE_STACK_SIZE,
                RUBY_VM_THREAD_MACHINE_STACK_SIZE_MIN);
 
    vm->default_params.fiber_vm_stack_size =
      get_param("RUBY_FIBER_VM_STACK_SIZE",
                RUBY_VM_FIBER_VM_STACK_SIZE,
                RUBY_VM_FIBER_VM_STACK_SIZE_MIN);
 
    vm->default_params.fiber_machine_stack_size =
      get_param("RUBY_FIBER_MACHINE_STACK_SIZE",
                RUBY_VM_FIBER_MACHINE_STACK_SIZE,
                RUBY_VM_FIBER_MACHINE_STACK_SIZE_MIN);
 
    /* environment dependent check */
    check_machine_stack_size(&vm->default_params.thread_machine_stack_size);
    check_machine_stack_size(&vm->default_params.fiber_machine_stack_size);
}
 
static void
vm_init2(rb_vm_t *vm)
{
    MEMZERO(vm, rb_vm_t, 1);
    rb_vm_living_threads_init(vm);
    vm->thread_report_on_exception = 1;
    vm->src_encoding_index = -1;
 
    vm_default_params_setup(vm);
}
 
void
rb_execution_context_update(const rb_execution_context_t *ec)
{
    /* update VM stack */
    if (ec->vm_stack) {
        VM_ASSERT(ec->cfp);
 
        rb_control_frame_t *cfp = ec->cfp;
        rb_control_frame_t *limit_cfp = (void *)(ec->vm_stack + ec->vm_stack_size);
 
        while (cfp != limit_cfp) {
            const VALUE *ep = cfp->ep;
            cfp->self = rb_gc_location(cfp->self);
            cfp->iseq = (rb_iseq_t *)rb_gc_location((VALUE)cfp->iseq);
            cfp->block_code = (void *)rb_gc_location((VALUE)cfp->block_code);
 
            if (!VM_ENV_LOCAL_P(ep)) {
                VALUE *prev_ep = (VALUE *)VM_ENV_PREV_EP(ep);
                if (VM_ENV_FLAGS(prev_ep, VM_ENV_FLAG_ESCAPED)) {
                    prev_ep[VM_ENV_DATA_INDEX_ENV] = rb_gc_location(prev_ep[VM_ENV_DATA_INDEX_ENV]);
                }
            }
 
            cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
        }
    }
}
 
void
rb_execution_context_mark(const rb_execution_context_t *ec)
{
    /* mark VM stack */
    if (ec->vm_stack) {
        VM_ASSERT(ec->cfp);
        VALUE *p = ec->vm_stack;
        VALUE *sp = ec->cfp->sp;
        rb_control_frame_t *cfp = ec->cfp;
        rb_control_frame_t *limit_cfp = (void *)(ec->vm_stack + ec->vm_stack_size);
 
        rb_gc_mark_vm_stack_values((long)(sp - p), p);
 
        while (cfp != limit_cfp) {
            const VALUE *ep = cfp->ep;
            VM_ASSERT(!!VM_ENV_FLAGS(ep, VM_ENV_FLAG_ESCAPED) == vm_ep_in_heap_p_(ec, ep));
            rb_gc_mark_movable(cfp->self);
            rb_gc_mark_movable((VALUE)cfp->iseq);
            rb_gc_mark_movable((VALUE)cfp->block_code);
 
            if (!VM_ENV_LOCAL_P(ep)) {
                const VALUE *prev_ep = VM_ENV_PREV_EP(ep);
                if (VM_ENV_FLAGS(prev_ep, VM_ENV_FLAG_ESCAPED)) {
                    rb_gc_mark_movable(prev_ep[VM_ENV_DATA_INDEX_ENV]);
                }
            }
 
            cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
        }
    }
 
    /* mark machine stack */
    if (ec->machine.stack_start && ec->machine.stack_end &&
        ec != GET_EC() /* marked for current ec at the first stage of marking */
        ) {
        rb_gc_mark_machine_stack(ec);
        rb_gc_mark_locations((VALUE *)&ec->machine.regs,
                             (VALUE *)(&ec->machine.regs) +
                             sizeof(ec->machine.regs) / (sizeof(VALUE)));
    }
 
    RUBY_MARK_UNLESS_NULL(ec->errinfo);
    RUBY_MARK_UNLESS_NULL(ec->root_svar);
    rb_mark_tbl(ec->local_storage);
    RUBY_MARK_UNLESS_NULL(ec->local_storage_recursive_hash);
    RUBY_MARK_UNLESS_NULL(ec->local_storage_recursive_hash_for_trace);
    RUBY_MARK_UNLESS_NULL(ec->private_const_reference);
}
 
void rb_fiber_mark_self(rb_fiber_t *fib);
void rb_fiber_update_self(rb_fiber_t *fib);
void rb_threadptr_root_fiber_setup(rb_thread_t *th);
void rb_threadptr_root_fiber_release(rb_thread_t *th);
 
static void
thread_compact(void *ptr)
{
    rb_thread_t *th = ptr;
    rb_fiber_update_self(th->ec->fiber_ptr);
 
    if (th->root_fiber) rb_fiber_update_self(th->root_fiber);
 
    rb_execution_context_update(th->ec);
}
 
static void
thread_mark(void *ptr)
{
    rb_thread_t *th = ptr;
    RUBY_MARK_ENTER("thread");
    rb_fiber_mark_self(th->ec->fiber_ptr);
 
    /* mark ruby objects */
    switch (th->invoke_type) {
      case thread_invoke_type_proc:
        RUBY_MARK_UNLESS_NULL(th->invoke_arg.proc.proc);
        RUBY_MARK_UNLESS_NULL(th->invoke_arg.proc.args);
        break;
      case thread_invoke_type_func:
        rb_gc_mark_maybe((VALUE)th->invoke_arg.func.arg);
        break;
      default:
        break;
    }
 
    RUBY_MARK_UNLESS_NULL(th->thgroup);
    RUBY_MARK_UNLESS_NULL(th->value);
    RUBY_MARK_UNLESS_NULL(th->pending_interrupt_queue);
    RUBY_MARK_UNLESS_NULL(th->pending_interrupt_mask_stack);
    RUBY_MARK_UNLESS_NULL(th->top_self);
    RUBY_MARK_UNLESS_NULL(th->top_wrapper);
    if (th->root_fiber) rb_fiber_mark_self(th->root_fiber);
 
    /* Ensure EC stack objects are pinned */
    rb_execution_context_mark(th->ec);
    RUBY_MARK_UNLESS_NULL(th->stat_insn_usage);
    RUBY_MARK_UNLESS_NULL(th->last_status);
    RUBY_MARK_UNLESS_NULL(th->locking_mutex);
    RUBY_MARK_UNLESS_NULL(th->name);
 
    RUBY_MARK_LEAVE("thread");
}
 
static void
thread_free(void *ptr)
{
    rb_thread_t *th = ptr;
    RUBY_FREE_ENTER("thread");
 
    if (th->locking_mutex != Qfalse) {
        rb_bug("thread_free: locking_mutex must be NULL (%p:%p)", (void *)th, (void *)th->locking_mutex);
    }
    if (th->keeping_mutexes != NULL) {
        rb_bug("thread_free: keeping_mutexes must be NULL (%p:%p)", (void *)th, (void *)th->keeping_mutexes);
    }
 
    rb_threadptr_root_fiber_release(th);
 
    if (th->vm && th->vm->main_thread == th) {
        RUBY_GC_INFO("main thread\n");
    }
    else {
        ruby_xfree(ptr);
    }
 
    RUBY_FREE_LEAVE("thread");
}
 
static size_t
thread_memsize(const void *ptr)
{
    const rb_thread_t *th = ptr;
    size_t size = sizeof(rb_thread_t);
 
    if (!th->root_fiber) {
        size += th->ec->vm_stack_size * sizeof(VALUE);
    }
    if (th->ec->local_storage) {
        size += st_memsize(th->ec->local_storage);
    }
    return size;
}
 
#define thread_data_type ruby_threadptr_data_type
const rb_data_type_t ruby_threadptr_data_type = {
    "VM/thread",
    {
        thread_mark,
        thread_free,
        thread_memsize,
        thread_compact,
    },
    0, 0, RUBY_TYPED_FREE_IMMEDIATELY
};
 
VALUE
rb_obj_is_thread(VALUE obj)
{
    if (rb_typeddata_is_kind_of(obj, &thread_data_type)) {
        return Qtrue;
    }
    else {
        return Qfalse;
    }
}
 
static VALUE
thread_alloc(VALUE klass)
{
    VALUE obj;
    rb_thread_t *th;
    obj = TypedData_Make_Struct(klass, rb_thread_t, &thread_data_type, th);
 
    return obj;
}
 
inline void
rb_ec_set_vm_stack(rb_execution_context_t *ec, VALUE *stack, size_t size)
{
    ec->vm_stack = stack;
    ec->vm_stack_size = size;
}
 
void
rb_ec_initialize_vm_stack(rb_execution_context_t *ec, VALUE *stack, size_t size)
{
    rb_ec_set_vm_stack(ec, stack, size);
 
    ec->cfp = (void *)(ec->vm_stack + ec->vm_stack_size);
 
    vm_push_frame(ec,
        NULL /* dummy iseq */,
        VM_FRAME_MAGIC_DUMMY | VM_ENV_FLAG_LOCAL | VM_FRAME_FLAG_FINISH | VM_FRAME_FLAG_CFRAME /* dummy frame */,
        Qnil /* dummy self */, VM_BLOCK_HANDLER_NONE /* dummy block ptr */,
        0 /* dummy cref/me */,
        0 /* dummy pc */, ec->vm_stack, 0, 0
    );
}
 
void
rb_ec_clear_vm_stack(rb_execution_context_t *ec)
{
    rb_ec_set_vm_stack(ec, NULL, 0);
 
    // Avoid dangling pointers:
    ec->cfp = NULL;
}
 
static void
th_init(rb_thread_t *th, VALUE self)
{
    th->self = self;
    rb_threadptr_root_fiber_setup(th);
 
    if (self == 0) {
        size_t size = th->vm->default_params.thread_vm_stack_size / sizeof(VALUE);
        rb_ec_initialize_vm_stack(th->ec, ALLOC_N(VALUE, size), size);
    }
    else {
        VM_ASSERT(th->ec->cfp == NULL);
        VM_ASSERT(th->ec->vm_stack == NULL);
        VM_ASSERT(th->ec->vm_stack_size == 0);
    }
 
    th->status = THREAD_RUNNABLE;
    th->last_status = Qnil;
    th->ec->errinfo = Qnil;
    th->ec->root_svar = Qfalse;
    th->ec->local_storage_recursive_hash = Qnil;
    th->ec->local_storage_recursive_hash_for_trace = Qnil;
#ifdef NON_SCALAR_THREAD_ID
    th->thread_id_string[0] = '\0';
#endif
 
#if OPT_CALL_THREADED_CODE
    th->retval = Qundef;
#endif
    th->name = Qnil;
    th->report_on_exception = th->vm->thread_report_on_exception;
}
 
static VALUE
ruby_thread_init(VALUE self)
{
    rb_thread_t *th = rb_thread_ptr(self);
    rb_vm_t *vm = GET_THREAD()->vm;
 
    th->vm = vm;
    th_init(th, self);
 
    th->top_wrapper = 0;
    th->top_self = rb_vm_top_self();
    th->ec->root_svar = Qfalse;
    return self;
}
 
VALUE
rb_thread_alloc(VALUE klass)
{
    VALUE self = thread_alloc(klass);
    ruby_thread_init(self);
    return self;
}
 
#define REWIND_CFP(expr) do { \
    rb_execution_context_t *ec__ = GET_EC(); \
    VALUE *const curr_sp = (ec__->cfp++)->sp; \
    VALUE *const saved_sp = ec__->cfp->sp; \
    ec__->cfp->sp = curr_sp; \
    expr; \
    (ec__->cfp--)->sp = saved_sp; \
} while (0)
 
static VALUE
m_core_set_method_alias(VALUE self, VALUE cbase, VALUE sym1, VALUE sym2)
{
    REWIND_CFP({
        rb_alias(cbase, SYM2ID(sym1), SYM2ID(sym2));
    });
    return Qnil;
}
 
static VALUE
m_core_set_variable_alias(VALUE self, VALUE sym1, VALUE sym2)
{
    REWIND_CFP({
        rb_alias_variable(SYM2ID(sym1), SYM2ID(sym2));
    });
    return Qnil;
}
 
static VALUE
m_core_undef_method(VALUE self, VALUE cbase, VALUE sym)
{
    REWIND_CFP({
        rb_undef(cbase, SYM2ID(sym));
        rb_clear_method_cache_by_class(self);
    });
    return Qnil;
}
 
static VALUE
m_core_set_postexe(VALUE self)
{
    rb_set_end_proc(rb_call_end_proc, rb_block_proc());
    return Qnil;
}
 
static VALUE core_hash_merge_kwd(VALUE hash, VALUE kw);
 
static VALUE
core_hash_merge(VALUE hash, long argc, const VALUE *argv)
{
    Check_Type(hash, T_HASH);
    VM_ASSERT(argc % 2 == 0);
    rb_hash_bulk_insert(argc, argv, hash);
    return hash;
}
 
static VALUE
m_core_hash_merge_ptr(int argc, VALUE *argv, VALUE recv)
{
    VALUE hash = argv[0];
 
    REWIND_CFP(hash = core_hash_merge(hash, argc-1, argv+1));
 
    return hash;
}
 
static int
kwmerge_i(VALUE key, VALUE value, VALUE hash)
{
    rb_hash_aset(hash, key, value);
    return ST_CONTINUE;
}
 
static VALUE
m_core_hash_merge_kwd(VALUE recv, VALUE hash, VALUE kw)
{
    REWIND_CFP(hash = core_hash_merge_kwd(hash, kw));
    return hash;
}
 
static VALUE
core_hash_merge_kwd(VALUE hash, VALUE kw)
{
    rb_hash_foreach(rb_to_hash_type(kw), kwmerge_i, hash);
    return hash;
}
 
/* Returns true if JIT is enabled */
static VALUE
mjit_enabled_p(VALUE _)
{
    return mjit_enabled ? Qtrue : Qfalse;
}
 
static VALUE
mjit_pause_m(int argc, VALUE *argv, RB_UNUSED_VAR(VALUE self))
{
    VALUE options = Qnil;
    VALUE wait = Qtrue;
    rb_scan_args(argc, argv, "0:", &options);
 
    if (!NIL_P(options)) {
        static ID keyword_ids[1];
        if (!keyword_ids[0])
            keyword_ids[0] = rb_intern("wait");
        rb_get_kwargs(options, keyword_ids, 0, 1, &wait);
    }
 
    return mjit_pause(RTEST(wait));
}
 
static VALUE
mjit_resume_m(VALUE _)
{
    return mjit_resume();
}
 
extern VALUE *rb_gc_stack_start;
extern size_t rb_gc_stack_maxsize;
 
/* debug functions */
 
/* :nodoc: */
static VALUE
sdr(VALUE self)
{
    rb_vm_bugreport(NULL);
    return Qnil;
}
 
/* :nodoc: */
static VALUE
nsdr(VALUE self)
{
    VALUE ary = rb_ary_new();
#if HAVE_BACKTRACE
#include <execinfo.h>
#define MAX_NATIVE_TRACE 1024
    static void *trace[MAX_NATIVE_TRACE];
    int n = (int)backtrace(trace, MAX_NATIVE_TRACE);
    char **syms = backtrace_symbols(trace, n);
    int i;
 
    if (syms == 0) {
        rb_memerror();
    }
 
    for (i=0; i<n; i++) {
        rb_ary_push(ary, rb_str_new2(syms[i]));
    }
    free(syms); /* OK */
#endif
    return ary;
}
 
#if VM_COLLECT_USAGE_DETAILS
static VALUE usage_analysis_insn_start(VALUE self);
static VALUE usage_analysis_operand_start(VALUE self);
static VALUE usage_analysis_register_start(VALUE self);
static VALUE usage_analysis_insn_stop(VALUE self);
static VALUE usage_analysis_operand_stop(VALUE self);
static VALUE usage_analysis_register_stop(VALUE self);
static VALUE usage_analysis_insn_running(VALUE self);
static VALUE usage_analysis_operand_running(VALUE self);
static VALUE usage_analysis_register_running(VALUE self);
static VALUE usage_analysis_insn_clear(VALUE self);
static VALUE usage_analysis_operand_clear(VALUE self);
static VALUE usage_analysis_register_clear(VALUE self);
#endif
 
static VALUE
f_raise(int c, VALUE *v, VALUE _)
{
    return rb_f_raise(c, v);
}
 
static VALUE
f_proc(VALUE _)
{
    return rb_block_proc();
}
 
static VALUE
f_lambda(VALUE _)
{
    return rb_block_lambda();
}
 
void
Init_VM(void)
{
    VALUE opts;
    VALUE klass;
    VALUE fcore;
    VALUE mjit;
 
    /*
     * Document-class: RubyVM
     *
     * The RubyVM module only exists on MRI. +RubyVM+ is not defined in
     * other Ruby implementations such as JRuby and TruffleRuby.
     *
     * The RubyVM module provides some access to MRI internals.
     * This module is for very limited purposes, such as debugging,
     * prototyping, and research.  Normal users must not use it.
     * This module is not portable between Ruby implementations.
     */
    rb_cRubyVM = rb_define_class("RubyVM", rb_cObject);
    rb_undef_alloc_func(rb_cRubyVM);
    rb_undef_method(CLASS_OF(rb_cRubyVM), "new");
    rb_define_singleton_method(rb_cRubyVM, "stat", vm_stat, -1);
#if USE_DEBUG_COUNTER
    rb_define_singleton_method(rb_cRubyVM, "reset_debug_counters", rb_debug_counter_reset, 0);
    rb_define_singleton_method(rb_cRubyVM, "show_debug_counters", rb_debug_counter_show, 0);
#endif
 
    /* FrozenCore (hidden) */
    fcore = rb_class_new(rb_cBasicObject);
    RBASIC(fcore)->flags = T_ICLASS;
    klass = rb_singleton_class(fcore);
    rb_define_method_id(klass, id_core_set_method_alias, m_core_set_method_alias, 3);
    rb_define_method_id(klass, id_core_set_variable_alias, m_core_set_variable_alias, 2);
    rb_define_method_id(klass, id_core_undef_method, m_core_undef_method, 2);
    rb_define_method_id(klass, id_core_set_postexe, m_core_set_postexe, 0);
    rb_define_method_id(klass, id_core_hash_merge_ptr, m_core_hash_merge_ptr, -1);
    rb_define_method_id(klass, id_core_hash_merge_kwd, m_core_hash_merge_kwd, 2);
    rb_define_method_id(klass, id_core_raise, f_raise, -1);
    rb_define_method_id(klass, idProc, f_proc, 0);
    rb_define_method_id(klass, idLambda, f_lambda, 0);
    rb_obj_freeze(fcore);
    RBASIC_CLEAR_CLASS(klass);
    rb_obj_freeze(klass);
    rb_gc_register_mark_object(fcore);
    rb_mRubyVMFrozenCore = fcore;
 
    /* ::RubyVM::MJIT
     * Provides access to the Method JIT compiler of MRI.
     * Of course, this module is MRI specific.
     */
    mjit = rb_define_module_under(rb_cRubyVM, "MJIT");
    rb_define_singleton_method(mjit, "enabled?", mjit_enabled_p, 0);
    rb_define_singleton_method(mjit, "pause", mjit_pause_m, -1);
    rb_define_singleton_method(mjit, "resume", mjit_resume_m, 0);
 
    /*
     * Document-class: Thread
     *
     *  Threads are the Ruby implementation for a concurrent programming model.
     *
     *  Programs that require multiple threads of execution are a perfect
     *  candidate for Ruby's Thread class.
     *
     *  For example, we can create a new thread separate from the main thread's
     *  execution using ::new.
     *
     *      thr = Thread.new { puts "What's the big deal" }
     *
     *  Then we are able to pause the execution of the main thread and allow
     *  our new thread to finish, using #join:
     *
     *      thr.join #=> "What's the big deal"
     *
     *  If we don't call +thr.join+ before the main thread terminates, then all
     *  other threads including +thr+ will be killed.
     *
     *  Alternatively, you can use an array for handling multiple threads at
     *  once, like in the following example:
     *
     *      threads = []
     *      threads << Thread.new { puts "What's the big deal" }
     *      threads << Thread.new { 3.times { puts "Threads are fun!" } }
     *
     *  After creating a few threads we wait for them all to finish
     *  consecutively.
     *
     *      threads.each { |thr| thr.join }
     *
     *  To retrieve the last value of a thread, use #value
     *
     *      thr = Thread.new { sleep 1; "Useful value" }
     *      thr.value #=> "Useful value"
     *
     *  === Thread initialization
     *
     *  In order to create new threads, Ruby provides ::new, ::start, and
     *  ::fork. A block must be provided with each of these methods, otherwise
     *  a ThreadError will be raised.
     *
     *  When subclassing the Thread class, the +initialize+ method of your
     *  subclass will be ignored by ::start and ::fork. Otherwise, be sure to
     *  call super in your +initialize+ method.
     *
     *  === Thread termination
     *
     *  For terminating threads, Ruby provides a variety of ways to do this.
     *
     *  The class method ::kill, is meant to exit a given thread:
     *
     *      thr = Thread.new { sleep }
     *      Thread.kill(thr) # sends exit() to thr
     *
     *  Alternatively, you can use the instance method #exit, or any of its
     *  aliases #kill or #terminate.
     *
     *      thr.exit
     *
     *  === Thread status
     *
     *  Ruby provides a few instance methods for querying the state of a given
     *  thread. To get a string with the current thread's state use #status
     *
     *      thr = Thread.new { sleep }
     *      thr.status # => "sleep"
     *      thr.exit
     *      thr.status # => false
     *
     *  You can also use #alive? to tell if the thread is running or sleeping,
     *  and #stop? if the thread is dead or sleeping.
     *
     *  === Thread variables and scope
     *
     *  Since threads are created with blocks, the same rules apply to other
     *  Ruby blocks for variable scope. Any local variables created within this
     *  block are accessible to only this thread.
     *
     *  ==== Fiber-local vs. Thread-local
     *
     *  Each fiber has its own bucket for Thread#[] storage. When you set a
     *  new fiber-local it is only accessible within this Fiber. To illustrate:
     *
     *      Thread.new {
     *        Thread.current[:foo] = "bar"
     *        Fiber.new {
     *          p Thread.current[:foo] # => nil
     *        }.resume
     *      }.join
     *
     *  This example uses #[] for getting and #[]= for setting fiber-locals,
     *  you can also use #keys to list the fiber-locals for a given
     *  thread and #key? to check if a fiber-local exists.
     *
     *  When it comes to thread-locals, they are accessible within the entire
     *  scope of the thread. Given the following example:
     *
     *      Thread.new{
     *        Thread.current.thread_variable_set(:foo, 1)
     *        p Thread.current.thread_variable_get(:foo) # => 1
     *        Fiber.new{
     *          Thread.current.thread_variable_set(:foo, 2)
     *          p Thread.current.thread_variable_get(:foo) # => 2
     *        }.resume
     *        p Thread.current.thread_variable_get(:foo)   # => 2
     *      }.join
     *
     *  You can see that the thread-local +:foo+ carried over into the fiber
     *  and was changed to +2+ by the end of the thread.
     *
     *  This example makes use of #thread_variable_set to create new
     *  thread-locals, and #thread_variable_get to reference them.
     *
     *  There is also #thread_variables to list all thread-locals, and
     *  #thread_variable? to check if a given thread-local exists.
     *
     *  === Exception handling
     *
     *  When an unhandled exception is raised inside a thread, it will
     *  terminate. By default, this exception will not propagate to other
     *  threads. The exception is stored and when another thread calls #value
     *  or #join, the exception will be re-raised in that thread.
     *
     *      t = Thread.new{ raise 'something went wrong' }
     *      t.value #=> RuntimeError: something went wrong
     *
     *  An exception can be raised from outside the thread using the
     *  Thread#raise instance method, which takes the same parameters as
     *  Kernel#raise.
     *
     *  Setting Thread.abort_on_exception = true, Thread#abort_on_exception =
     *  true, or $DEBUG = true will cause a subsequent unhandled exception
     *  raised in a thread to be automatically re-raised in the main thread.
     *
     *  With the addition of the class method ::handle_interrupt, you can now
     *  handle exceptions asynchronously with threads.
     *
     *  === Scheduling
     *
     *  Ruby provides a few ways to support scheduling threads in your program.
     *
     *  The first way is by using the class method ::stop, to put the current
     *  running thread to sleep and schedule the execution of another thread.
     *
     *  Once a thread is asleep, you can use the instance method #wakeup to
     *  mark your thread as eligible for scheduling.
     *
     *  You can also try ::pass, which attempts to pass execution to another
     *  thread but is dependent on the OS whether a running thread will switch
     *  or not. The same goes for #priority, which lets you hint to the thread
     *  scheduler which threads you want to take precedence when passing
     *  execution. This method is also dependent on the OS and may be ignored
     *  on some platforms.
     *
     */
    rb_cThread = rb_define_class("Thread", rb_cObject);
    rb_undef_alloc_func(rb_cThread);
 
#if VM_COLLECT_USAGE_DETAILS
    /* ::RubyVM::USAGE_ANALYSIS_* */
#define define_usage_analysis_hash(name) /* shut up rdoc -C */ \
    rb_define_const(rb_cRubyVM, "USAGE_ANALYSIS_" #name, rb_hash_new())
    define_usage_analysis_hash(INSN);
    define_usage_analysis_hash(REGS);
    define_usage_analysis_hash(INSN_BIGRAM);
 
    rb_define_singleton_method(rb_cRubyVM, "USAGE_ANALYSIS_INSN_START", usage_analysis_insn_start, 0);
    rb_define_singleton_method(rb_cRubyVM, "USAGE_ANALYSIS_OPERAND_START", usage_analysis_operand_start, 0);
    rb_define_singleton_method(rb_cRubyVM, "USAGE_ANALYSIS_REGISTER_START", usage_analysis_register_start, 0);
    rb_define_singleton_method(rb_cRubyVM, "USAGE_ANALYSIS_INSN_STOP", usage_analysis_insn_stop, 0);
    rb_define_singleton_method(rb_cRubyVM, "USAGE_ANALYSIS_OPERAND_STOP", usage_analysis_operand_stop, 0);
    rb_define_singleton_method(rb_cRubyVM, "USAGE_ANALYSIS_REGISTER_STOP", usage_analysis_register_stop, 0);
    rb_define_singleton_method(rb_cRubyVM, "USAGE_ANALYSIS_INSN_RUNNING", usage_analysis_insn_running, 0);
    rb_define_singleton_method(rb_cRubyVM, "USAGE_ANALYSIS_OPERAND_RUNNING", usage_analysis_operand_running, 0);
    rb_define_singleton_method(rb_cRubyVM, "USAGE_ANALYSIS_REGISTER_RUNNING", usage_analysis_register_running, 0);
    rb_define_singleton_method(rb_cRubyVM, "USAGE_ANALYSIS_INSN_CLEAR", usage_analysis_insn_clear, 0);
    rb_define_singleton_method(rb_cRubyVM, "USAGE_ANALYSIS_OPERAND_CLEAR", usage_analysis_operand_clear, 0);
    rb_define_singleton_method(rb_cRubyVM, "USAGE_ANALYSIS_REGISTER_CLEAR", usage_analysis_register_clear, 0);
#endif
 
    /* ::RubyVM::OPTS
     * An Array of VM build options.
     * This constant is MRI specific.
     */
    rb_define_const(rb_cRubyVM, "OPTS", opts = rb_ary_new());
 
#if   OPT_DIRECT_THREADED_CODE
    rb_ary_push(opts, rb_str_new2("direct threaded code"));
#elif OPT_TOKEN_THREADED_CODE
    rb_ary_push(opts, rb_str_new2("token threaded code"));
#elif OPT_CALL_THREADED_CODE
    rb_ary_push(opts, rb_str_new2("call threaded code"));
#endif
 
#if OPT_STACK_CACHING
    rb_ary_push(opts, rb_str_new2("stack caching"));
#endif
#if OPT_OPERANDS_UNIFICATION
    rb_ary_push(opts, rb_str_new2("operands unification"));
#endif
#if OPT_INSTRUCTIONS_UNIFICATION
    rb_ary_push(opts, rb_str_new2("instructions unification"));
#endif
#if OPT_INLINE_METHOD_CACHE
    rb_ary_push(opts, rb_str_new2("inline method cache"));
#endif
#if OPT_BLOCKINLINING
    rb_ary_push(opts, rb_str_new2("block inlining"));
#endif
 
    /* ::RubyVM::INSTRUCTION_NAMES
     * A list of bytecode instruction names in MRI.
     * This constant is MRI specific.
     */
    rb_define_const(rb_cRubyVM, "INSTRUCTION_NAMES", rb_insns_name_array());
 
    /* ::RubyVM::DEFAULT_PARAMS
     * This constant exposes the VM's default parameters.
     * Note that changing these values does not affect VM execution.
     * Specification is not stable and you should not depend on this value.
     * Of course, this constant is MRI specific.
     */
    rb_define_const(rb_cRubyVM, "DEFAULT_PARAMS", vm_default_params());
 
    /* debug functions ::RubyVM::SDR(), ::RubyVM::NSDR() */
#if VMDEBUG
    rb_define_singleton_method(rb_cRubyVM, "SDR", sdr, 0);
    rb_define_singleton_method(rb_cRubyVM, "NSDR", nsdr, 0);
#else
    (void)sdr;
    (void)nsdr;
#endif
 
    /* VM bootstrap: phase 2 */
    {
        rb_vm_t *vm = ruby_current_vm_ptr;
        rb_thread_t *th = GET_THREAD();
        VALUE filename = rb_fstring_lit("<main>");
        const rb_iseq_t *iseq = rb_iseq_new(0, filename, filename, Qnil, 0, ISEQ_TYPE_TOP);
 
        /* create vm object */
        vm->self = TypedData_Wrap_Struct(rb_cRubyVM, &vm_data_type, vm);
 
        /* create main thread */
        th->self = TypedData_Wrap_Struct(rb_cThread, &thread_data_type, th);
        vm->main_thread = th;
        vm->running_thread = th;
        th->vm = vm;
        th->top_wrapper = 0;
        th->top_self = rb_vm_top_self();
        rb_thread_set_current(th);
 
        rb_vm_living_threads_insert(vm, th);
 
        rb_gc_register_mark_object((VALUE)iseq);
        th->ec->cfp->iseq = iseq;
        th->ec->cfp->pc = iseq->body->iseq_encoded;
        th->ec->cfp->self = th->top_self;
 
        VM_ENV_FLAGS_UNSET(th->ec->cfp->ep, VM_FRAME_FLAG_CFRAME);
        VM_STACK_ENV_WRITE(th->ec->cfp->ep, VM_ENV_DATA_INDEX_ME_CREF, (VALUE)vm_cref_new(rb_cObject, METHOD_VISI_PRIVATE, FALSE, NULL, FALSE));
 
        /*
         * The Binding of the top level scope
         */
        rb_define_global_const("TOPLEVEL_BINDING", rb_binding_new());
    }
    vm_init_redefined_flag();
 
    rb_block_param_proxy = rb_obj_alloc(rb_cObject);
    rb_add_method(rb_singleton_class(rb_block_param_proxy), idCall, VM_METHOD_TYPE_OPTIMIZED,
                  (void *)OPTIMIZED_METHOD_TYPE_BLOCK_CALL, METHOD_VISI_PUBLIC);
    rb_obj_freeze(rb_block_param_proxy);
    rb_gc_register_mark_object(rb_block_param_proxy);
 
    /* vm_backtrace.c */
    Init_vm_backtrace();
}
 
void
rb_vm_set_progname(VALUE filename)
{
    rb_thread_t *th = GET_VM()->main_thread;
    rb_control_frame_t *cfp = (void *)(th->ec->vm_stack + th->ec->vm_stack_size);
    --cfp;
 
    rb_iseq_pathobj_set(cfp->iseq, rb_str_dup(filename), rb_iseq_realpath(cfp->iseq));
}
 
extern const struct st_hash_type rb_fstring_hash_type;
 
void
Init_BareVM(void)
{
    /* VM bootstrap: phase 1 */
    rb_vm_t * vm = ruby_mimmalloc(sizeof(*vm));
    rb_thread_t * th = ruby_mimmalloc(sizeof(*th));
    if (!vm || !th) {
        fprintf(stderr, "[FATAL] failed to allocate memory\n");
        exit(EXIT_FAILURE);
    }
    MEMZERO(th, rb_thread_t, 1);
    vm_init2(vm);
 
    vm->objspace = rb_objspace_alloc();
    ruby_current_vm_ptr = vm;
 
    Init_native_thread(th);
    th->vm = vm;
    th_init(th, 0);
    rb_thread_set_current_raw(th);
    ruby_thread_init_stack(th);
}
 
void
Init_vm_objects(void)
{
    rb_vm_t *vm = GET_VM();
 
    vm->defined_module_hash = st_init_numtable();
 
    /* initialize mark object array, hash */
    vm->mark_object_ary = rb_ary_tmp_new(128);
    vm->loading_table = st_init_strtable();
    vm->frozen_strings = st_init_table_with_size(&rb_fstring_hash_type, 10000);
 
    rb_objspace_gc_enable(vm->objspace);
}
 
/* top self */
 
static VALUE
main_to_s(VALUE obj)
{
    return rb_str_new2("main");
}
 
VALUE
rb_vm_top_self(void)
{
    return GET_VM()->top_self;
}
 
void
Init_top_self(void)
{
    rb_vm_t *vm = GET_VM();
 
    vm->top_self = rb_obj_alloc(rb_cObject);
    rb_define_singleton_method(rb_vm_top_self(), "to_s", main_to_s, 0);
    rb_define_alias(rb_singleton_class(rb_vm_top_self()), "inspect", "to_s");
}
 
static VALUE *
ruby_vm_verbose_ptr(rb_vm_t *vm)
{
    return &vm->verbose;
}
 
static VALUE *
ruby_vm_debug_ptr(rb_vm_t *vm)
{
    return &vm->debug;
}
 
VALUE *
rb_ruby_verbose_ptr(void)
{
    return ruby_vm_verbose_ptr(GET_VM());
}
 
VALUE *
rb_ruby_debug_ptr(void)
{
    return ruby_vm_debug_ptr(GET_VM());
}
 
/* iseq.c */
VALUE rb_insn_operand_intern(const rb_iseq_t *iseq,
                             VALUE insn, int op_no, VALUE op,
                             int len, size_t pos, VALUE *pnop, VALUE child);
 
st_table *
rb_vm_fstring_table(void)
{
    return GET_VM()->frozen_strings;
}
 
#if VM_COLLECT_USAGE_DETAILS
 
#define HASH_ASET(h, k, v) rb_hash_aset((h), (st_data_t)(k), (st_data_t)(v))
 
/* uh = {
 *   insn(Fixnum) => ihash(Hash)
 * }
 * ihash = {
 *   -1(Fixnum) => count,      # insn usage
 *    0(Fixnum) => ophash,     # operand usage
 * }
 * ophash = {
 *   val(interned string) => count(Fixnum)
 * }
 */
static void
vm_analysis_insn(int insn)
{
    ID usage_hash;
    ID bigram_hash;
    static int prev_insn = -1;
 
    VALUE uh;
    VALUE ihash;
    VALUE cv;
 
    CONST_ID(usage_hash, "USAGE_ANALYSIS_INSN");
    CONST_ID(bigram_hash, "USAGE_ANALYSIS_INSN_BIGRAM");
    uh = rb_const_get(rb_cRubyVM, usage_hash);
    if ((ihash = rb_hash_aref(uh, INT2FIX(insn))) == Qnil) {
        ihash = rb_hash_new();
        HASH_ASET(uh, INT2FIX(insn), ihash);
    }
    if ((cv = rb_hash_aref(ihash, INT2FIX(-1))) == Qnil) {
        cv = INT2FIX(0);
    }
    HASH_ASET(ihash, INT2FIX(-1), INT2FIX(FIX2INT(cv) + 1));
 
    /* calc bigram */
    if (prev_insn != -1) {
        VALUE bi;
        VALUE ary[2];
        VALUE cv;
 
        ary[0] = INT2FIX(prev_insn);
        ary[1] = INT2FIX(insn);
        bi = rb_ary_new4(2, &ary[0]);
 
        uh = rb_const_get(rb_cRubyVM, bigram_hash);
        if ((cv = rb_hash_aref(uh, bi)) == Qnil) {
            cv = INT2FIX(0);
        }
        HASH_ASET(uh, bi, INT2FIX(FIX2INT(cv) + 1));
    }
    prev_insn = insn;
}
 
static void
vm_analysis_operand(int insn, int n, VALUE op)
{
    ID usage_hash;
 
    VALUE uh;
    VALUE ihash;
    VALUE ophash;
    VALUE valstr;
    VALUE cv;
 
    CONST_ID(usage_hash, "USAGE_ANALYSIS_INSN");
 
    uh = rb_const_get(rb_cRubyVM, usage_hash);
    if ((ihash = rb_hash_aref(uh, INT2FIX(insn))) == Qnil) {
        ihash = rb_hash_new();
        HASH_ASET(uh, INT2FIX(insn), ihash);
    }
    if ((ophash = rb_hash_aref(ihash, INT2FIX(n))) == Qnil) {
        ophash = rb_hash_new();
        HASH_ASET(ihash, INT2FIX(n), ophash);
    }
    /* intern */
    valstr = rb_insn_operand_intern(GET_EC()->cfp->iseq, insn, n, op, 0, 0, 0, 0);
 
    /* set count */
    if ((cv = rb_hash_aref(ophash, valstr)) == Qnil) {
        cv = INT2FIX(0);
    }
    HASH_ASET(ophash, valstr, INT2FIX(FIX2INT(cv) + 1));
}
 
static void
vm_analysis_register(int reg, int isset)
{
    ID usage_hash;
    VALUE uh;
    VALUE valstr;
    static const char regstrs[][5] = {
        "pc",                   /* 0 */
        "sp",                   /* 1 */
        "ep",                   /* 2 */
        "cfp",                  /* 3 */
        "self",                 /* 4 */
        "iseq",                 /* 5 */
    };
    static const char getsetstr[][4] = {
        "get",
        "set",
    };
    static VALUE syms[sizeof(regstrs) / sizeof(regstrs[0])][2];
 
    VALUE cv;
 
    CONST_ID(usage_hash, "USAGE_ANALYSIS_REGS");
    if (syms[0] == 0) {
        char buff[0x10];
        int i;
 
        for (i = 0; i < (int)(sizeof(regstrs) / sizeof(regstrs[0])); i++) {
            int j;
            for (j = 0; j < 2; j++) {
                snprintf(buff, 0x10, "%d %s %-4s", i, getsetstr[j], regstrs[i]);
                syms[i][j] = ID2SYM(rb_intern(buff));
            }
        }
    }
    valstr = syms[reg][isset];
 
    uh = rb_const_get(rb_cRubyVM, usage_hash);
    if ((cv = rb_hash_aref(uh, valstr)) == Qnil) {
        cv = INT2FIX(0);
    }
    HASH_ASET(uh, valstr, INT2FIX(FIX2INT(cv) + 1));
}
 
#undef HASH_ASET
 
static void (*ruby_vm_collect_usage_func_insn)(int insn) = NULL;
static void (*ruby_vm_collect_usage_func_operand)(int insn, int n, VALUE op) = NULL;
static void (*ruby_vm_collect_usage_func_register)(int reg, int isset) = NULL;
 
/* :nodoc: */
static VALUE
usage_analysis_insn_start(VALUE self)
{
    ruby_vm_collect_usage_func_insn = vm_analysis_insn;
    return Qnil;
}
 
/* :nodoc: */
static VALUE
usage_analysis_operand_start(VALUE self)
{
    ruby_vm_collect_usage_func_operand = vm_analysis_operand;
    return Qnil;
}
 
/* :nodoc: */
static VALUE
usage_analysis_register_start(VALUE self)
{
    ruby_vm_collect_usage_func_register = vm_analysis_register;
    return Qnil;
}
 
/* :nodoc: */
static VALUE
usage_analysis_insn_stop(VALUE self)
{
    ruby_vm_collect_usage_func_insn = 0;
    return Qnil;
}
 
/* :nodoc: */
static VALUE
usage_analysis_operand_stop(VALUE self)
{
    ruby_vm_collect_usage_func_operand = 0;
    return Qnil;
}
 
/* :nodoc: */
static VALUE
usage_analysis_register_stop(VALUE self)
{
    ruby_vm_collect_usage_func_register = 0;
    return Qnil;
}
 
/* :nodoc: */
static VALUE
usage_analysis_insn_running(VALUE self)
{
  if (ruby_vm_collect_usage_func_insn == 0) return Qfalse;
  return Qtrue;
}
 
/* :nodoc: */
static VALUE
usage_analysis_operand_running(VALUE self)
{
  if (ruby_vm_collect_usage_func_operand == 0) return Qfalse;
  return Qtrue;
}
 
/* :nodoc: */
static VALUE
usage_analysis_register_running(VALUE self)
{
  if (ruby_vm_collect_usage_func_register == 0) return Qfalse;
  return Qtrue;
}
 
/* :nodoc: */
static VALUE
usage_analysis_insn_clear(VALUE self)
{
  ID usage_hash;
  ID bigram_hash;
  VALUE uh;
  VALUE bh;
 
  CONST_ID(usage_hash, "USAGE_ANALYSIS_INSN");
  CONST_ID(bigram_hash, "USAGE_ANALYSIS_INSN_BIGRAM");
  uh = rb_const_get(rb_cRubyVM, usage_hash);
  bh = rb_const_get(rb_cRubyVM, bigram_hash);
  rb_hash_clear(uh);
  rb_hash_clear(bh);
 
  return Qtrue;
}
 
/* :nodoc: */
static VALUE
usage_analysis_operand_clear(VALUE self)
{
  ID usage_hash;
  VALUE uh;
 
  CONST_ID(usage_hash, "USAGE_ANALYSIS_INSN");
  uh = rb_const_get(rb_cRubyVM, usage_hash);
  rb_hash_clear(uh);
 
  return Qtrue;
}
 
/* :nodoc: */
static VALUE
usage_analysis_register_clear(VALUE self)
{
  ID usage_hash;
  VALUE uh;
 
  CONST_ID(usage_hash, "USAGE_ANALYSIS_REGS");
  uh = rb_const_get(rb_cRubyVM, usage_hash);
  rb_hash_clear(uh);
 
  return Qtrue;
}
 
#else
 
MAYBE_UNUSED(static void (*ruby_vm_collect_usage_func_insn)(int insn)) = NULL;
MAYBE_UNUSED(static void (*ruby_vm_collect_usage_func_operand)(int insn, int n, VALUE op)) = NULL;
MAYBE_UNUSED(static void (*ruby_vm_collect_usage_func_register)(int reg, int isset)) = NULL;
 
#endif
 
#if VM_COLLECT_USAGE_DETAILS
/* @param insn instruction number */
static void
vm_collect_usage_insn(int insn)
{
    if (RUBY_DTRACE_INSN_ENABLED()) {
        RUBY_DTRACE_INSN(rb_insns_name(insn));
    }
    if (ruby_vm_collect_usage_func_insn)
        (*ruby_vm_collect_usage_func_insn)(insn);
}
 
/* @param insn instruction number
 * @param n    n-th operand
 * @param op   operand value
 */
static void
vm_collect_usage_operand(int insn, int n, VALUE op)
{
    if (RUBY_DTRACE_INSN_OPERAND_ENABLED()) {
        VALUE valstr;
 
        valstr = rb_insn_operand_intern(GET_EC()->cfp->iseq, insn, n, op, 0, 0, 0, 0);
 
        RUBY_DTRACE_INSN_OPERAND(RSTRING_PTR(valstr), rb_insns_name(insn));
        RB_GC_GUARD(valstr);
    }
    if (ruby_vm_collect_usage_func_operand)
        (*ruby_vm_collect_usage_func_operand)(insn, n, op);
}
 
/* @param reg register id. see code of vm_analysis_register() */
/* @param isset 0: read, 1: write */
static void
vm_collect_usage_register(int reg, int isset)
{
    if (ruby_vm_collect_usage_func_register)
        (*ruby_vm_collect_usage_func_register)(reg, isset);
}
#endif
 
#endif /* #ifndef MJIT_HEADER */
 
#include "vm_call_iseq_optimized.inc" /* required from vm_insnhelper.c */