Add %GetCallerJSFunction intrinsic

src/compiler/js-intrinsic-lowering.cc

Index: src/compiler/js-intrinsic-lowering.cc
diff --git a/src/compiler/js-intrinsic-lowering.cc b/src/compiler/js-intrinsic-lowering.cc
index 2a3bdf8fa85bfe3dd54589852432fdefce70d93a..39b3f4d85a29b24d3809d2b466aa7d66830b8a89 100644
--- a/src/compiler/js-intrinsic-lowering.cc
+++ b/src/compiler/js-intrinsic-lowering.cc
@@ -84,6 +84,8 @@ Reduction JSIntrinsicLowering::Reduce(Node* node) {
       return ReduceFixedArraySet(node);
     case Runtime::kInlineGetTypeFeedbackVector:
       return ReduceGetTypeFeedbackVector(node);
+    case Runtime::kInlineGetCallerJSFunction:
+      return ReduceGetCallerJSFunction(node);
     default:
       break;
   }
@@ -455,6 +457,35 @@ Reduction JSIntrinsicLowering::ReduceGetTypeFeedbackVector(Node* node) {
 }
 
 
+Reduction JSIntrinsicLowering::ReduceGetCallerJSFunction(Node* node) {
+  Node* effect = NodeProperties::GetEffectInput(node);
+  Node* control = NodeProperties::GetControlInput(node);
+
+  if (FLAG_turbo_deoptimization) {

[Michael Starzinger, 2015/06/05 11:21:56]

This flag no longer exists, we can just perform this step unconditionally now.

[danno, 2015/06/05 11:49:59]

Done.

+    Node* const frame_state = NodeProperties::GetFrameStateInput(node, 0);
+    Node* outer_frame = frame_state->InputAt(kFrameStateOuterStateInput);
+    if (outer_frame->opcode() == IrOpcode::kFrameState) {
+      // Use the runtime implementation to throw the appropriate error if the
+      // containing function is inlined.
+      return NoChange();
+    }
+  }
+
+  // TODO(danno): If FLAG_turbo_deoptimization is false then this intrinsic
+  // always returns the JSFunction from the caller's frame, regardless of
+  // inlining depth, which isn't correct. This implementation also forces
+  // intrinsic lowering to happen after inlining, which is fine for now, but
+  // eventually the frame-querying logic probably should go later, e.g. in
+  // instruction selection, so that there is no phase-ordering dependency.

[Michael Starzinger, 2015/06/05 11:21:56]

nit: The TODO now no longer applies, correct?

[danno, 2015/06/05 11:49:59]

Sort of. The inlining ordering dependency still exists.

+  FieldAccess access = AccessBuilder::ForFrameCallerFramePtr();
+  Node* fp = graph()->NewNode(machine()->LoadFramePointer());
+  Node* next_fp =
+      graph()->NewNode(simplified()->LoadField(access), fp, effect, control);
+  return Change(node, simplified()->LoadField(AccessBuilder::ForFrameMarker()),
+                next_fp, effect, control);
+}
+
+
 Reduction JSIntrinsicLowering::Change(Node* node, const Operator* op, Node* a,
                                       Node* b) {
   node->set_op(op);