ko1	2017-08-10 13:55:12 +0900 (Thu, 10 Aug 2017)

  New Revision: 59563

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59563

  Log:
    rename rb_execution_context_t::stack(_size) to vm_stack(_size).
    
    * vm_core.h: Ruby processes run with two stacks, a machine stack and a
      VM stack. To make it clear, this fix renames
      rb_execution_context_t::stack(_size) to vm_stack(_size).

  Modified files:
    trunk/cont.c
    trunk/eval.c
    trunk/thread.c
    trunk/vm.c
    trunk/vm_core.h
    trunk/vm_dump.c
    trunk/vm_exec.h
    trunk/vm_insnhelper.c
    trunk/vm_insnhelper.h
Index: thread.c
===================================================================
--- thread.c	(revision 59562)
+++ thread.c	(revision 59563)
@@ -694,8 +694,8 @@ thread_start_func_2(rb_thread_t *th, VAL https://github.com/ruby/ruby/blob/trunk/thread.c#L694
 	rb_threadptr_unlock_all_locking_mutexes(th);
 	rb_check_deadlock(th->vm);
 
-	rb_thread_recycle_stack_release(th->ec.stack);
-	th->ec.stack = NULL;
+	rb_thread_recycle_stack_release(th->ec.vm_stack);
+	th->ec.vm_stack = NULL;
     }
     native_mutex_lock(&th->vm->thread_destruct_lock);
     /* make sure vm->running_thread never point me after this point.*/
Index: vm_insnhelper.c
===================================================================
--- vm_insnhelper.c	(revision 59562)
+++ vm_insnhelper.c	(revision 59563)
@@ -1516,8 +1516,8 @@ vm_base_ptr(const rb_control_frame_t *cf https://github.com/ruby/ruby/blob/trunk/vm_insnhelper.c#L1516
 #if VM_DEBUG_BP_CHECK
 	if (bp != cfp->bp_check) {
 	    fprintf(stderr, "bp_check: %ld, bp: %ld\n",
-		    (long)(cfp->bp_check - GET_THREAD()->ec.stack),
-		    (long)(bp - GET_THREAD()->ec.stack));
+		    (long)(cfp->bp_check - GET_THREAD()->ec.vm_stack),
+		    (long)(bp - GET_THREAD()->ec.vm_stack));
 	    rb_bug("vm_base_ptr: unreachable");
 	}
 #endif
Index: vm_insnhelper.h
===================================================================
--- vm_insnhelper.h	(revision 59562)
+++ vm_insnhelper.h	(revision 59563)
@@ -95,7 +95,7 @@ enum vm_regan_acttype { https://github.com/ruby/ruby/blob/trunk/vm_insnhelper.h#L95
 #define SET_SV(x)  (*GET_SP() = (x))
   /* set current stack value as x */
 
-#define GET_SP_COUNT() (VM_REG_SP - th->ec.stack)
+#define GET_SP_COUNT() (VM_REG_SP - th->ec.vm_stack)
 
 /* instruction sequence C struct */
 #define GET_ISEQ() (GET_CFP()->iseq)
Index: vm_core.h
===================================================================
--- vm_core.h	(revision 59562)
+++ vm_core.h	(revision 59563)
@@ -737,8 +737,8 @@ typedef struct rb_fiber_struct rb_fiber_ https://github.com/ruby/ruby/blob/trunk/vm_core.h#L737
 
 typedef struct rb_thread_context_struct {
     /* execution information */
-    VALUE *stack;		/* must free, must mark */
-    size_t stack_size;          /* size in word (byte size / sizeof(VALUE)) */
+    VALUE *vm_stack;		/* must free, must mark */
+    size_t vm_stack_size;       /* size in word (byte size / sizeof(VALUE)) */
     rb_control_frame_t *cfp;
 
     struct rb_vm_tag *tag;
@@ -1235,7 +1235,7 @@ VALUE rb_vm_frame_block_handler(const rb https://github.com/ruby/ruby/blob/trunk/vm_core.h#L1235
 #define RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp) ((cfp)+1)
 #define RUBY_VM_NEXT_CONTROL_FRAME(cfp) ((cfp)-1)
 #define RUBY_VM_END_CONTROL_FRAME(th) \
-  ((rb_control_frame_t *)((th)->ec.stack + (th)->ec.stack_size))
+  ((rb_control_frame_t *)((th)->ec.vm_stack + (th)->ec.vm_stack_size))
 #define RUBY_VM_VALID_CONTROL_FRAME_P(cfp, ecfp) \
   ((void *)(ecfp) > (void *)(cfp))
 #define RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(th, cfp) \
Index: eval.c
===================================================================
--- eval.c	(revision 59562)
+++ eval.c	(revision 59563)
@@ -1127,7 +1127,7 @@ previous_frame(rb_thread_t *th) https://github.com/ruby/ruby/blob/trunk/eval.c#L1127
 {
     rb_control_frame_t *prev_cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(th->ec.cfp);
     /* check if prev_cfp can be accessible */
-    if ((void *)(th->ec.stack + th->ec.stack_size) == (void *)(prev_cfp)) {
+    if ((void *)(th->ec.vm_stack + th->ec.vm_stack_size) == (void *)(prev_cfp)) {
         return 0;
     }
     return prev_cfp;
Index: cont.c
===================================================================
--- cont.c	(revision 59562)
+++ cont.c	(revision 59563)
@@ -87,8 +87,8 @@ typedef struct rb_context_struct { https://github.com/ruby/ruby/blob/trunk/cont.c#L87
     VALUE value;
     VALUE *vm_stack;
 #ifdef CAPTURE_JUST_VALID_VM_STACK
-    size_t vm_stack_slen;  /* length of stack (head of th->ec.stack) */
-    size_t vm_stack_clen;  /* length of control frames (tail of th->ec.stack) */
+    size_t vm_stack_slen;  /* length of stack (head of th->ec.svm_tack) */
+    size_t vm_stack_clen;  /* length of control frames (tail of th->ec.vm_stack) */
 #endif
     struct {
 	VALUE *stack;
@@ -265,7 +265,7 @@ cont_free(void *ptr) https://github.com/ruby/ruby/blob/trunk/cont.c#L265
     rb_context_t *cont = ptr;
 
     RUBY_FREE_ENTER("cont");
-    RUBY_FREE_UNLESS_NULL(cont->saved_thread.ec.stack);
+    RUBY_FREE_UNLESS_NULL(cont->saved_thread.ec.vm_stack);
 #if FIBER_USE_NATIVE
     if (cont->type == CONTINUATION_CONTEXT) {
 	/* cont */
@@ -324,7 +324,7 @@ cont_memsize(const void *ptr) https://github.com/ruby/ruby/blob/trunk/cont.c#L324
 #ifdef CAPTURE_JUST_VALID_VM_STACK
 	size_t n = (cont->vm_stack_slen + cont->vm_stack_clen);
 #else
-	size_t n = cont->saved_thread.ec.stack_size;
+	size_t n = cont->saved_thread.ec.vm_stack_size;
 #endif
 	size += n * sizeof(*cont->vm_stack);
     }
@@ -346,10 +346,10 @@ fiber_verify(const rb_fiber_t *fib) https://github.com/ruby/ruby/blob/trunk/cont.c#L346
 #if VM_CHECK_MODE > 0
     switch (fib->status) {
       case FIBER_RESUMED:
-	VM_ASSERT(fib->cont.saved_thread.ec.stack == NULL);
+	VM_ASSERT(fib->cont.saved_thread.ec.vm_stack == NULL);
 	break;
       case FIBER_SUSPENDED:
-	VM_ASSERT(fib->cont.saved_thread.ec.stack != NULL);
+	VM_ASSERT(fib->cont.saved_thread.ec.vm_stack != NULL);
 	break;
       case FIBER_CREATED:
       case FIBER_TERMINATED:
@@ -531,17 +531,17 @@ cont_capture(volatile int *volatile stat https://github.com/ruby/ruby/blob/trunk/cont.c#L531
     contval = cont->self;
 
 #ifdef CAPTURE_JUST_VALID_VM_STACK
-    cont->vm_stack_slen = ec->cfp->sp - ec->stack;
-    cont->vm_stack_clen = ec->stack + ec->stack_size - (VALUE*)ec->cfp;
+    cont->vm_stack_slen = ec->cfp->sp - ec->vm_stack;
+    cont->vm_stack_clen = ec->vm_stack + ec->vm_stack_size - (VALUE*)ec->cfp;
     cont->vm_stack = ALLOC_N(VALUE, cont->vm_stack_slen + cont->vm_stack_clen);
-    MEMCPY(cont->vm_stack, ec->stack, VALUE, cont->vm_stack_slen);
+    MEMCPY(cont->vm_stack, ec->vm_stack, VALUE, cont->vm_stack_slen);
     MEMCPY(cont->vm_stack + cont->vm_stack_slen,
 		(VALUE*)ec->cfp, VALUE, cont->vm_stack_clen);
 #else
-    cont->vm_stack = ALLOC_N(VALUE, ec->stack_size);
-    MEMCPY(cont->vm_stack, ec->stack, VALUE, ec->stack_size);
+    cont->vm_stack = ALLOC_N(VALUE, ec->vm_stack_size);
+    MEMCPY(cont->vm_stack, ec->vm_stack, VALUE, ec->vm_stack_size);
 #endif
-    cont->saved_thread.ec.stack = NULL;
+    cont->saved_thread.ec.vm_stack = NULL;
 
     cont_save_machine_stack(th, cont);
 
@@ -590,16 +590,16 @@ cont_restore_thread(rb_context_t *cont) https://github.com/ruby/ruby/blob/trunk/cont.c#L590
 	th->fiber = sth->fiber;
 	fib = th->fiber ? th->fiber : th->root_fiber;
 
-	if (fib && fib->cont.saved_thread.ec.stack) {
-	    th->ec.stack_size = fib->cont.saved_thread.ec.stack_size;
-	    th->ec.stack = fib->cont.saved_thread.ec.stack;
+	if (fib && fib->cont.saved_thread.ec.vm_stack) {
+	    th->ec.vm_stack_size = fib->cont.saved_thread.ec.vm_stack_size;
+	    th->ec.vm_stack = fib->cont.saved_thread.ec.vm_stack;
 	}
 #ifdef CAPTURE_JUST_VALID_VM_STACK
-	MEMCPY(th->ec.stack, cont->vm_stack, VALUE, cont->vm_stack_slen);
-	MEMCPY(th->ec.stack + sth->ec.stack_size - cont->vm_stack_clen,
+	MEMCPY(th->ec.vm_stack, cont->vm_stack, VALUE, cont->vm_stack_slen);
+	MEMCPY(th->ec.vm_stack + sth->ec.vm_stack_size - cont->vm_stack_clen,
 	       cont->vm_stack + cont->vm_stack_slen, VALUE, cont->vm_stack_clen);
 #else
-	MEMCPY(th->ec.stack, cont->vm_stack, VALUE, sth->ec.stack_size);
+	MEMCPY(th->ec.vm_stack, cont->vm_stack, VALUE, sth->ec.vm_stack_size);
 #endif
 
 	/* other members of ec */
@@ -617,11 +617,11 @@ cont_restore_thread(rb_context_t *cont) https://github.com/ruby/ruby/blob/trunk/cont.c#L617
     else {
 	/* fiber */
 	th->ec = sth->ec;
-	sth->ec.stack = NULL;
+	sth->ec.vm_stack = NULL;
 	th->fiber = (rb_fiber_t*)cont;
     }
 
-    VM_ASSERT(th->ec.stack != NULL);
+    VM_ASSERT(th->ec.vm_stack != NULL);
     VM_ASSERT(sth->status == THREAD_RUNNABLE);
 }
 
@@ -1258,12 +1258,12 @@ fiber_init(VALUE fibval, VALUE proc) https://github.com/ruby/ruby/blob/trunk/cont.c#L1258
     /* initialize cont */
     cont->vm_stack = 0;
 
-    th->ec.stack = NULL;
-    th->ec.stack_size = 0;
+    th->ec.vm_stack = NULL;
+    th->ec.vm_stack_size = 0;
 
-    th->ec.stack_size = cth->vm->default_params.fiber_vm_stack_size / sizeof(VALUE);
-    th->ec.stack = ALLOC_N(VALUE, th->ec.stack_size);
-    th->ec.cfp = (void *)(th->ec.stack + th->ec.stack_size);
+    th->ec.vm_stack_size = cth->vm->default_params.fiber_vm_stack_size / sizeof(VALUE);
+    th->ec.vm_stack = ALLOC_N(VALUE, th->ec.vm_stack_size);
+    th->ec.cfp = (void *)(th->ec.vm_stack + th->ec.vm_stack_size);
 
     rb_vm_push_frame(th,
 		     NULL,
@@ -1272,7 +1272,7 @@ fiber_init(VALUE fibval, VALUE proc) https://github.com/ruby/ruby/blob/trunk/cont.c#L1272
 		     VM_BLOCK_HANDLER_NONE,
 		     0, /* specval */
 		     NULL, /* pc */
-		     th->ec.stack, /* sp */
+		     th->ec.vm_stack, /* sp */
 		     0, /* local_size */
 		     0);
 
@@ -1374,7 +1374,7 @@ fiber_current(void) https://github.com/ruby/ruby/blob/trunk/cont.c#L1374
     if (th->fiber == 0) {
 	rb_fiber_t *fib = root_fiber_alloc(th);
 	/* Running thread object has stack management responsibility */
-	fib->cont.saved_thread.ec.stack = NULL;
+	fib->cont.saved_thread.ec.vm_stack = NULL;
     }
     return th->fiber;
 }
Index: vm_exec.h
===================================================================
--- vm_exec.h	(revision 59562)
+++ vm_exec.h	(revision 59563)
@@ -157,7 +157,7 @@ default:                        \ https://github.com/ruby/ruby/blob/trunk/vm_exec.h#L157
 
 #endif
 
-#define VM_SP_CNT(th, sp) ((sp) - (th)->ec.stack)
+#define VM_SP_CNT(th, sp) ((sp) - (th)->ec.vm_stack)
 
 #if OPT_CALL_THREADED_CODE
 #define THROW_EXCEPTION(exc) do { \
Index: vm_dump.c
===================================================================
--- vm_dump.c	(revision 59562)
+++ vm_dump.c	(revision 59563)
@@ -22,14 +22,14 @@ https://github.com/ruby/ruby/blob/trunk/vm_dump.c#L22
 #define MAX_POSBUF 128
 
 #define VM_CFP_CNT(th, cfp) \
-  ((rb_control_frame_t *)((th)->ec.stack + (th)->ec.stack_size) - \
+  ((rb_control_frame_t *)((th)->ec.vm_stack + (th)->ec.vm_stack_size) - \
    (rb_control_frame_t *)(cfp))
 
 static void
 control_frame_dump(rb_thread_t *th, rb_control_frame_t *cfp)
 {
     ptrdiff_t pc = -1;
-    ptrdiff_t ep = cfp->ep - th->ec.stack;
+    ptrdiff_t ep = cfp->ep - th->ec.vm_stack;
     char ep_in_heap = ' ';
     char posbuf[MAX_POSBUF+1];
     int line = 0;
@@ -39,7 +39,7 @@ control_frame_dump(rb_thread_t *th, rb_c https://github.com/ruby/ruby/blob/trunk/vm_dump.c#L39
 
     const rb_callable_method_entry_t *me;
 
-    if (ep < 0 || (size_t)ep > th->ec.stack_size) {
+    if (ep < 0 || (size_t)ep > th->ec.vm_stack_size) {
 	ep = (ptrdiff_t)cfp->ep;
 	ep_in_heap = 'p';
     }
@@ -112,14 +112,14 @@ control_frame_dump(rb_thread_t *th, rb_c https://github.com/ruby/ruby/blob/trunk/vm_dump.c#L112
     }
 
     fprintf(stderr, "c:%04"PRIdPTRDIFF" ",
-	    ((rb_control_frame_t *)(th->ec.stack + th->ec.stack_size) - cfp));
+	    ((rb_control_frame_t *)(th->ec.vm_stack + th->ec.vm_stack_size) - cfp));
     if (pc == -1) {
 	fprintf(stderr, "p:---- ");
     }
     else {
 	fprintf(stderr, "p:%04"PRIdPTRDIFF" ", pc);
     }
-    fprintf(stderr, "s:%04"PRIdPTRDIFF" ", cfp->sp - th->ec.stack);
+    fprintf(stderr, "s:%04"PRIdPTRDIFF" ", cfp->sp - th->ec.vm_stack);
     fprintf(stderr, ep_in_heap == ' ' ? "e:%06"PRIdPTRDIFF" " : "E:%06"PRIxPTRDIFF" ", ep % 10000);
     fprintf(stderr, "%-6s", magic);
     if (line) {
@@ -145,12 +145,12 @@ rb_vmdebug_stack_dump_raw(rb_thread_t *t https://github.com/ruby/ruby/blob/trunk/vm_dump.c#L145
     VALUE *p, *st, *t;
 
     fprintf(stderr, "-- stack frame ------------\n");
-    for (p = st = th->ec.stack; p < sp; p++) {
+    for (p = st = th->ec.vm_stack; p < sp; p++) {
 	fprintf(stderr, "%04ld (%p): %08"PRIxVALUE, (long)(p - st), p, *p);
 
 	t = (VALUE *)*p;
-	if (th->ec.stack <= t && t < sp) {
-	    fprintf(stderr, " (= %ld)", (long)((VALUE *)GC_GUARDED_PTR_REF(t) - th->ec.stack));
+	if (th->ec.vm_stack <= t && t < sp) {
+	    fprintf(stderr, " (= %ld)", (long)((VALUE *)GC_GUARDED_PTR_REF(t) - th->ec.vm_stack));
 	}
 
 	if (p == ep)
@@ -162,7 +162,7 @@ rb_vmdebug_stack_dump_raw(rb_thread_t *t https://github.com/ruby/ruby/blob/trunk/vm_dump.c#L162
 
     fprintf(stderr, "-- Control frame information "
 	    "-----------------------------------------------\n");
-    while ((void *)cfp < (void *)(th->ec.stack + th->ec.stack_size)) {
+    while ((void *)cfp < (void *)(th->ec.vm_stack + th->ec.vm_stack_size)) {
 	control_frame_dump(th, cfp);
 	cfp++;
     }
@@ -285,7 +285,7 @@ vm_stack_dump_each(rb_thread_t *th, rb_c https://github.com/ruby/ruby/blob/trunk/vm_dump.c#L285
 		break;
 	    }
 	    fprintf(stderr, "  stack %2d: %8s (%"PRIdPTRDIFF")\n", i, StringValueCStr(rstr),
-		    (ptr - th->ec.stack));
+		    (ptr - th->ec.vm_stack));
 	}
     }
     else if (VM_FRAME_FINISHED_P(cfp)) {
@@ -307,20 +307,20 @@ rb_vmdebug_debug_print_register(rb_threa https://github.com/ruby/ruby/blob/trunk/vm_dump.c#L307
 {
     rb_control_frame_t *cfp = th->ec.cfp;
     ptrdiff_t pc = -1;
-    ptrdiff_t ep = cfp->ep - th->ec.stack;
+    ptrdiff_t ep = cfp->ep - th->ec.vm_stack;
     ptrdiff_t cfpi;
 
     if (VM_FRAME_RUBYFRAME_P(cfp)) {
 	pc = cfp->pc - cfp->iseq->body->iseq_encoded;
     }
 
-    if (ep < 0 || (size_t)ep > th->ec.stack_size) {
+    if (ep < 0 || (size_t)ep > th->ec.vm_stack_size) {
 	ep = -1;
     }
 
-    cfpi = ((rb_control_frame_t *)(th->ec.stack + th->ec.stack_size)) - cfp;
+    cfpi = ((rb_control_frame_t *)(th->ec.vm_stack + th->ec.vm_stack_size)) - cfp;
     fprintf(stderr, "  [PC] %04"PRIdPTRDIFF", [SP] %04"PRIdPTRDIFF", [EP] %04"PRIdPTRDIFF", [CFP] %04"PRIdPTRDIFF"\n",
-	    pc, (cfp->sp - th->ec.stack), ep, cfpi);
+	    pc, (cfp->sp - th->ec.vm_stack), ep, cfpi);
 }
 
 void
@@ -342,7 +342,7 @@ rb_vmdebug_debug_print_pre(rb_thread_t * https://github.com/ruby/ruby/blob/trunk/vm_dump.c#L342
 	    printf(" ");
 	}
 	printf("| ");
-	if(0)printf("[%03ld] ", (long)(cfp->sp - th->ec.stack));
+	if(0)printf("[%03ld] ", (long)(cfp->sp - th->ec.vm_stack));
 
 	/* printf("%3"PRIdPTRDIFF" ", VM_CFP_CNT(th, cfp)); */
 	if (pc >= 0) {
Index: vm.c
===================================================================
--- vm.c	(revision 59562)
+++ vm.c	(revision 59563)
@@ -88,8 +88,8 @@ rb_vm_frame_block_handler(const rb_contr https://github.com/ruby/ruby/blob/trunk/vm.c#L88
 static int
 VM_CFP_IN_HEAP_P(const rb_thread_t *th, const rb_control_frame_t *cfp)
 {
-    const VALUE *start = th->ec.stack;
-    const VALUE *end = (VALUE *)th->ec.stack + th->ec.stack_size;
+    const VALUE *start = th->ec.vm_stack;
+    const VALUE *end = (VALUE *)th->ec.vm_stack + th->ec.vm_stack_size;
     VM_ASSERT(start != NULL);
 
     if (start <= (VALUE *)cfp && (VALUE *)cfp < end) {
@@ -103,7 +103,7 @@ VM_CFP_IN_HEAP_P(const rb_thread_t *th, https://github.com/ruby/ruby/blob/trunk/vm.c#L103
 static int
 VM_EP_IN_HEAP_P(const rb_thread_t *th, const VALUE *ep)
 {
-    const VALUE *start = th->ec.stack;
+    const VALUE *start = th->ec.vm_stack;
     const VALUE *end = (VALUE *)th->ec.cfp;
     VM_ASSERT(start != NULL);
 
@@ -2370,11 +2370,11 @@ rb_thread_mark(void *ptr) https://github.com/ruby/ruby/blob/trunk/vm.c#L2370
     RUBY_MARK_ENTER("thread");
 
     /* mark VM stack */
-    if (th->ec.stack) {
-	VALUE *p = th->ec.stack;
+    if (th->ec.vm_stack) {
+	VALUE *p = th->ec.vm_stack;
 	VALUE *sp = th->ec.cfp->sp;
 	rb_control_frame_t *cfp = th->ec.cfp;
-	rb_control_frame_t *limit_cfp = (void *)(th->ec.stack + th->ec.stack_size);
+	rb_control_frame_t *limit_cfp = (void *)(th->ec.vm_stack + th->ec.vm_stack_size);
 
 	rb_gc_mark_values((long)(sp - p), p);
 
@@ -2435,9 +2435,9 @@ thread_free(void *ptr) https://github.com/ruby/ruby/blob/trunk/vm.c#L2435
     rb_thread_t *th = ptr;
     RUBY_FREE_ENTER("thread");
 
-    if (th->ec.stack != NULL) {
-	rb_thread_recycle_stack_release(th->ec.stack);
-	th->ec.stack = NULL;
+    if (th->ec.vm_stack != NULL) {
+	rb_thread_recycle_stack_release(th->ec.vm_stack);
+	th->ec.vm_stack = NULL;
     }
 
     if (th->locking_mutex != Qfalse) {
@@ -2475,7 +2475,7 @@ thread_memsize(const void *ptr) https://github.com/ruby/ruby/blob/trunk/vm.c#L2475
     size_t size = sizeof(rb_thread_t);
 
     if (!th->root_fiber) {
-	size += th->ec.stack_size * sizeof(VALUE);
+	size += th->ec.vm_stack_size * sizeof(VALUE);
     }
     if (th->ec.local_storage) {
 	size += st_memsize(th->ec.local_storage);
@@ -2525,18 +2525,18 @@ th_init(rb_thread_t *th, VALUE self) https://github.com/ruby/ruby/blob/trunk/vm.c#L2525
     /* altstack of main thread is reallocated in another place */
     th->altstack = malloc(rb_sigaltstack_size());
 #endif
-    /* th->ec.stack_size is word number.
+    /* th->ec.vm_stack_size is word number.
      * th->vm->default_params.thread_vm_stack_size is byte size.
      */
-    th->ec.stack_size = th->vm->default_params.thread_vm_stack_size / sizeof(VALUE);
-    th->ec.stack = thread_recycle_stack(th->ec.stack_size);
+    th->ec.vm_stack_size = th->vm->default_params.thread_vm_stack_size / sizeof(VALUE);
+    th->ec.vm_stack = thread_recycle_stack(th->ec.vm_stack_size);
 
-    th->ec.cfp = (void *)(th->ec.stack + th->ec.stack_size);
+    th->ec.cfp = (void *)(th->ec.vm_stack + th->ec.vm_stack_size);
 
     vm_push_frame(th, 0 /* 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 */, th->ec.stack, 0, 0);
+		  0 /* dummy pc */, th->ec.vm_stack, 0, 0);
 
     th->status = THREAD_RUNNABLE;
     th->last_status = Qnil;
@@ -3102,7 +3102,7 @@ void https://github.com/ruby/ruby/blob/trunk/vm.c#L3102
 rb_vm_set_progname(VALUE filename)
 {
     rb_thread_t *th = GET_VM()->main_thread;
-    rb_control_frame_t *cfp = (void *)(th->ec.stack + th->ec.stack_size);
+    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));

--
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