Initial support for count-based profiling

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 80ea7f4b6f0f27dbad94b90799747017e69466b6..adf346cef7249c26df20136edeec166483cd4049 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -8711,8 +8711,14 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_CompileForOnStackReplacement) {
     function->PrintName();
     PrintF("]\n");
   }
-  StackCheckStub check_stub;
-  Handle<Code> check_code = check_stub.GetCode();
+  Handle<Code> check_code;
+  if (FLAG_count_based_interrupts) {
+    InterruptStub interrupt_stub;
+    check_code = interrupt_stub.GetCode();
+  } else {
+    StackCheckStub check_stub;
+    check_code = check_stub.GetCode();
+  }
   Handle<Code> replacement_code = isolate->builtins()->OnStackReplacement();
   Deoptimizer::RevertStackCheckCode(*unoptimized,
                                     *check_code,
@@ -9266,6 +9272,12 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_StackGuard) {
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_Interrupt) {
+  ASSERT(args.length() == 0);
+  return Execution::HandleStackGuardInterrupt();
+}
+
+
 static int StackSize() {
   int n = 0;
   for (JavaScriptFrameIterator it; !it.done(); it.Advance()) n++;