Upgrade V8 to version 4.9.385.28
https://chromium.googlesource.com/v8/v8/+/4.9.385.28
FPIIM-449
Change-Id: I4b2e74289d4bf3667f2f3dc8aa2e541f63e26eb4
diff --git a/src/crankshaft/hydrogen-mark-unreachable.cc b/src/crankshaft/hydrogen-mark-unreachable.cc
new file mode 100644
index 0000000..4e1dd68
--- /dev/null
+++ b/src/crankshaft/hydrogen-mark-unreachable.cc
@@ -0,0 +1,55 @@
+// 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-unreachable.h"
+
+namespace v8 {
+namespace internal {
+
+
+void HMarkUnreachableBlocksPhase::MarkUnreachableBlocks() {
+ // If there is unreachable code in the graph, propagate the unreachable marks
+ // using a fixed-point iteration.
+ bool changed = true;
+ const ZoneList<HBasicBlock*>* blocks = graph()->blocks();
+ while (changed) {
+ changed = false;
+ for (int i = 0; i < blocks->length(); i++) {
+ HBasicBlock* block = blocks->at(i);
+ if (!block->IsReachable()) continue;
+ bool is_reachable = blocks->at(0) == block;
+ for (HPredecessorIterator it(block); !it.Done(); it.Advance()) {
+ HBasicBlock* predecessor = it.Current();
+ // A block is reachable if one of its predecessors is reachable,
+ // doesn't deoptimize and either is known to transfer control to the
+ // block or has a control flow instruction for which the next block
+ // cannot be determined.
+ if (predecessor->IsReachable() && !predecessor->IsDeoptimizing()) {
+ HBasicBlock* pred_succ;
+ bool known_pred_succ =
+ predecessor->end()->KnownSuccessorBlock(&pred_succ);
+ if (!known_pred_succ || pred_succ == block) {
+ is_reachable = true;
+ break;
+ }
+ }
+ if (block->is_osr_entry()) {
+ is_reachable = true;
+ }
+ }
+ if (!is_reachable) {
+ block->MarkUnreachable();
+ changed = true;
+ }
+ }
+ }
+}
+
+
+void HMarkUnreachableBlocksPhase::Run() {
+ MarkUnreachableBlocks();
+}
+
+} // namespace internal
+} // namespace v8