1 files changed, 62 insertions, 0 deletions
diff --git a/deps/v8/src/crankshaft/hydrogen-mark-deoptimize.cc b/deps/v8/src/crankshaft/hydrogen-mark-deoptimize.cc
new file mode 100644
index 0000000000..a706d91323
--- /dev/null
+++ b/deps/v8/src/crankshaft/hydrogen-mark-deoptimize.cc
@@ -0,0 +1,62 @@
+// Copyright 2013 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/crankshaft/hydrogen-mark-deoptimize.h"
+
+namespace v8 {
+namespace internal {
+
+void HMarkDeoptimizeOnUndefinedPhase::Run() {
+  const ZoneList<HPhi*>* phi_list = graph()->phi_list();
+  for (int i = 0; i < phi_list->length(); i++) {
+    HPhi* phi = phi_list->at(i);
+    if (phi->CheckFlag(HValue::kAllowUndefinedAsNaN) &&
+        !phi->CheckUsesForFlag(HValue::kAllowUndefinedAsNaN)) {
+      ProcessPhi(phi);
+    }
+  }
+}
+
+
+void HMarkDeoptimizeOnUndefinedPhase::ProcessPhi(HPhi* phi) {
+  DCHECK(phi->CheckFlag(HValue::kAllowUndefinedAsNaN));
+  DCHECK(worklist_.is_empty());
+
+  // Push the phi onto the worklist
+  phi->ClearFlag(HValue::kAllowUndefinedAsNaN);
+  worklist_.Add(phi, zone());
+
+  // Process all phis that can reach this phi
+  while (!worklist_.is_empty()) {
+    phi = worklist_.RemoveLast();
+    for (int i = phi->OperandCount() - 1; i >= 0; --i) {
+      HValue* input = phi->OperandAt(i);
+      if (input->IsPhi() && input->CheckFlag(HValue::kAllowUndefinedAsNaN)) {
+        input->ClearFlag(HValue::kAllowUndefinedAsNaN);
+        worklist_.Add(HPhi::cast(input), zone());
+      }
+    }
+  }
+}
+
+
+void HComputeChangeUndefinedToNaN::Run() {
+  const ZoneList<HBasicBlock*>* blocks(graph()->blocks());
+  for (int i = 0; i < blocks->length(); ++i) {
+    const HBasicBlock* block(blocks->at(i));
+    for (HInstruction* current = block->first(); current != NULL; ) {
+      HInstruction* next = current->next();
+      if (current->IsChange()) {
+        if (HChange::cast(current)->can_convert_undefined_to_nan()) {
+          current->SetFlag(HValue::kAllowUndefinedAsNaN);
+        }
+      }
+      current = next;
+    }
+  }
+}
+
+
+}  // namespace internal
+}  // namespace v8