Support stepin for combination of apply and bound function

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/23513023

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16777 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/debug.cc

@@ -1793,10 +1793,14 @@ void Debug::HandleStepIn(Handle<JSFunction> function,
         // function to be called and not the code for Builtins::FunctionApply or
         // Builtins::FunctionCall. The receiver of call/apply is the target
         // function.
-        if (!holder.is_null() && holder->IsJSFunction() &&
-            !JSFunction::cast(*holder)->IsBuiltin()) {
+        if (!holder.is_null() && holder->IsJSFunction()) {
           Handle<JSFunction> js_function = Handle<JSFunction>::cast(holder);
+          if (!js_function->IsBuiltin()) {
             Debug::FloodWithOneShot(js_function);
+          } else if (js_function->shared()->bound()) {
+            // Handle Function.prototype.bind
+            Debug::FloodBoundFunctionWithOneShot(js_function);
+          }
         }
       } else {
         Debug::FloodWithOneShot(function);

test/mjsunit/debug-stepin-function-call.js

@@ -142,8 +142,19 @@ function bind1() {
   bound();
 }
 
+// Test step into apply of bound function.
+function applyAndBind1() {
+  var bound = g.bind(null, 3);
+  debugger;
+  bound.apply(null, [3]);
+  var aLocalVar = 'test';
+  var anotherLocalVar  = g(aLocalVar) + 's';
+  var yetAnotherLocal = 10;
+}
+
 var testFunctions =
-    [call1, call2, call3, call4, apply1, apply2, apply3, apply4, bind1];
+    [call1, call2, call3, call4, apply1, apply2, apply3, apply4, bind1,
+    applyAndBind1];
 
 for (var i = 0; i < testFunctions.length; i++) {
   state = 0;