Handle breaks on keyed IC loads which can have an inlined version

test/cctest/test-debug.cc

 // Copyright 2007-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2159 matching lines @@
   foo->Call(env->Global(), 0, NULL);
 
   // Without stepping only active break points are hit.
   CHECK_EQ(1, break_point_hit_count);
 
   v8::Debug::SetDebugEventListener(NULL);
   CheckDebuggerUnloaded();
 }
 
 
+// Test of the stepping mechanism for keyed load in a loop.
+TEST(DebugStepKeyedLoadLoop) {
+  v8::HandleScope scope;
+  DebugLocalContext env;
+
+  // Create a function for testing stepping of keyed load. The statement 'y=1'
+  // is there to have more than one breakable statement in the loop, TODO(315).
+  v8::Local<v8::Function> foo = CompileFunction(
+      &env,
+      "function foo(a) {\n"
+      "  var x;\n"
+      "  var len = a.length;\n"
+      "  for (var i = 0; i < len; i++) {\n"
+      "    y = 1;\n"
+      "    x = a[i];\n"
+      "  }\n"
+      "}\n",
+      "foo");
+
+  // Create array [0,1,2,3,4,5,6,7,8,9]
+  v8::Local<v8::Array> a = v8::Array::New(10);
+  for (int i = 0; i < 10; i++) {
+    a->Set(v8::Number::New(i), v8::Number::New(i));
+  }
+
+  // Call function without any break points to ensure inlining is in place.
+  const int kArgc = 1;
+  v8::Handle<v8::Value> args[kArgc] = { a };
+  foo->Call(env->Global(), kArgc, args);
+
+  // Register a debug event listener which steps and counts.
+  v8::Debug::SetDebugEventListener(DebugEventStep);
+
+  // Setup break point and step through the function.
+  SetBreakPoint(foo, 3);
+  step_action = StepNext;
+  break_point_hit_count = 0;
+  foo->Call(env->Global(), kArgc, args);
+
+  // With stepping all break locations are hit.
+  CHECK_EQ(22, break_point_hit_count);
+
+  v8::Debug::SetDebugEventListener(NULL);
+  CheckDebuggerUnloaded();
+}
+
+
 // Test the stepping mechanism with different ICs.
 TEST(DebugStepLinearMixedICs) {
   v8::HandleScope scope;
   DebugLocalContext env;
 
   // Create a function for testing stepping.
   v8::Local<v8::Function> foo = CompileFunction(&env,
       "function bar() {};"
       "function foo() {"
       "  var x;"
@@ skipping 2274 matching lines @@
   v8::ScriptOrigin origin2 = v8::ScriptOrigin(v8::String::New("new name"));
   v8::Handle<v8::Script> script2 = v8::Script::Compile(script, &origin2);
   script2->Run();
   script2->SetData(data_obj);
   f = v8::Local<v8::Function>::Cast(env->Global()->Get(v8::String::New("f")));
   f->Call(env->Global(), 0, NULL);
   CHECK_EQ(2, break_point_hit_count);
   CHECK_EQ("new name", last_script_name_hit);
   CHECK_EQ("abc 123", last_script_data_hit);
 }