[Interpreter] Add CallRuntime support to the interpreter.

src/compiler/interpreter-assembler.cc

Index: src/compiler/interpreter-assembler.cc
diff --git a/src/compiler/interpreter-assembler.cc b/src/compiler/interpreter-assembler.cc
index c73b628bb193e326544e8d4fad5c3b5ce8db968d..ca6c6134ed26f840742982aa633ecfce58befafc 100644
--- a/src/compiler/interpreter-assembler.cc
+++ b/src/compiler/interpreter-assembler.cc
@@ -299,7 +299,7 @@ Node* InterpreterAssembler::LoadTypeFeedbackVector() {
 
 Node* InterpreterAssembler::CallJS(Node* function, Node* first_arg,
                                    Node* arg_count) {
-  Callable builtin = CodeFactory::PushArgsAndCall(isolate());
+  Callable builtin = CodeFactory::InterpreterPushArgsAndCall(isolate());
   CallDescriptor* descriptor = Linkage::GetStubCallDescriptor(
       isolate(), zone(), builtin.descriptor(), 0, CallDescriptor::kNoFlags);
 
@@ -350,6 +350,33 @@ Node* InterpreterAssembler::CallIC(CallInterfaceDescriptor descriptor,
 }
 
 
+Node* InterpreterAssembler::CallRuntime(Node* function_id, Node* first_arg,
+                                        Node* arg_count) {
+  Callable builtin = CodeFactory::InterpreterCEntry(isolate());

[Michael Starzinger, 2015/09/29 08:28:34]

nit: This is no longer a "builtin", should we just use "callable" for this local
variable throughout the file for consistency and to avoid confusion?

[rmcilroy, 2015/10/01 17:02:44]

Done.

+  CallDescriptor* descriptor = Linkage::GetStubCallDescriptor(
+      isolate(), zone(), builtin.descriptor(), 0, CallDescriptor::kNoFlags);
+
+  Node* code_target = HeapConstant(builtin.code());
+
+  // Get the function entry from the function id.
+  Node* function_table = raw_assembler_->ExternalConstant(
+      ExternalReference::runtime_function_table_address(isolate()));
+  Node* function_offset = raw_assembler_->Int32Mul(
+      function_id, Int32Constant(sizeof(Runtime::Function)));
+  Node* function = IntPtrAdd(function_table, function_offset);
+  Node* function_entry = raw_assembler_->Load(
+      kMachPtr, function, Int32Constant(offsetof(Runtime::Function, entry)));
+
+  Node** args = zone()->NewArray<Node*>(4);
+  args[0] = arg_count;
+  args[1] = first_arg;
+  args[2] = function_entry;
+  args[3] = ContextTaggedPointer();
+
+  return raw_assembler_->CallN(descriptor, code_target, args);
+}
+
+
 Node* InterpreterAssembler::CallRuntime(Runtime::FunctionId function_id,
                                         Node* arg1) {
   return raw_assembler_->CallRuntime1(function_id, arg1,