prevent stack overflow

* gc.c: enable PREVENT_STACK_OVERFLOW.

* vm.c (invoke_iseq_block_from_c): prevent stack overflow.

* vm_eval.c (stack_check): raise preallocated exception instance.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59630 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

gc.c

@@ -4004,6 +4004,7 @@ ruby_stack_length(VALUE **p)
     return STACK_LENGTH;
 }
 
+#define PREVENT_STACK_OVERFLOW 1
 #ifndef PREVENT_STACK_OVERFLOW
 #if !(defined(POSIX_SIGNAL) && defined(SIGSEGV) && defined(HAVE_SIGALTSTACK))
 # define PREVENT_STACK_OVERFLOW 1

vm.c

@@ -1018,6 +1018,7 @@ invoke_iseq_block_from_c(rb_thread_t *th, const struct rb_captured_block *captur
     VALUE *sp = cfp->sp;
     const rb_callable_method_entry_t *me = th->passed_bmethod_me;
     th->passed_bmethod_me = NULL;
+    stack_check(th);
 
     CHECK_VM_STACK_OVERFLOW(cfp, argc);
     cfp->sp = sp + argc;

vm_eval.c

@@ -258,7 +258,7 @@ stack_check(rb_thread_t *th)
     if (!rb_thread_raised_p(th, RAISED_STACKOVERFLOW) &&
 	rb_threadptr_stack_check(th)) {
 	rb_thread_raised_set(th, RAISED_STACKOVERFLOW);
-	rb_exc_raise(sysstack_error);
+	rb_threadptr_stack_overflow(th);
     }
 }