Implement a type recording ToBoolean IC.

src/ic.cc

Index: src/ic.cc
===================================================================
--- src/ic.cc	(revision 8701)
+++ src/ic.cc	(working copy)
@@ -309,6 +309,7 @@
     case Code::UNARY_OP_IC:
     case Code::BINARY_OP_IC:
     case Code::COMPARE_IC:
+    case Code::TO_BOOLEAN_IC:
       // Clearing these is tricky and does not
       // make any performance difference.
       return;
@@ -842,14 +843,6 @@
 }
 
 
-#ifdef DEBUG
-#define TRACE_IC_NAMED(msg, name) \
-  if (FLAG_trace_ic) PrintF(msg, *(name)->ToCString())
-#else
-#define TRACE_IC_NAMED(msg, name)
-#endif
-
-
 MaybeObject* LoadIC::Load(State state,
                           Handle<Object> object,
                           Handle<String> name) {
@@ -2506,6 +2499,31 @@
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, ToBoolean_Patch) {
+  ASSERT(args.length() == 3);
+
+  HandleScope scope(isolate);
+  Handle<Object> object = args.at<Object>(0);
+  Register tos = Register::from_code(args.smi_at(1));
+  ToBooleanStub::Types old_types(args.smi_at(2));
+
+  ToBooleanStub::Types new_types(old_types);
+  bool to_boolean_value = new_types.Record(object);
+  old_types.TraceTransition(new_types);
+
+  ToBooleanStub stub(tos, new_types);
+  Handle<Code> code = stub.GetCode();
+  ToBooleanIC ic(isolate);
+  ic.patch(*code);
+  return Smi::FromInt(to_boolean_value ? 1 : 0);
+}
+
+
+void ToBooleanIC::patch(Code* code) {
+  set_target(code);
+}
+
+
 static const Address IC_utilities[] = {
 #define ADDR(name) FUNCTION_ADDR(name),
     IC_UTIL_LIST(ADDR)