webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 54 insertions, 0 deletions

diff --git a/Source/ThirdParty/ANGLE/src/compiler/translator/UnfoldShortCircuitAST.cpp b/Source/ThirdParty/ANGLE/src/compiler/translator/UnfoldShortCircuitAST.cpp
new file mode 100644
index 000000000..e57681eda
--- /dev/null
+++ b/Source/ThirdParty/ANGLE/src/compiler/translator/UnfoldShortCircuitAST.cpp
@@ -0,0 +1,54 @@
+//
+// Copyright (c) 2002-2013 The ANGLE 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 "compiler/translator/UnfoldShortCircuitAST.h"
+
+namespace
+{
+
+// "x || y" is equivalent to "x ? true : y".
+TIntermTernary *UnfoldOR(TIntermTyped *x, TIntermTyped *y)
+{
+    TConstantUnion *u = new TConstantUnion;
+    u->setBConst(true);
+    TIntermConstantUnion *trueNode = new TIntermConstantUnion(
+        u, TType(EbtBool, EbpUndefined, EvqConst, 1));
+    return new TIntermTernary(x, trueNode, y);
+}
+
+// "x && y" is equivalent to "x ? y : false".
+TIntermTernary *UnfoldAND(TIntermTyped *x, TIntermTyped *y)
+{
+    TConstantUnion *u = new TConstantUnion;
+    u->setBConst(false);
+    TIntermConstantUnion *falseNode = new TIntermConstantUnion(
+        u, TType(EbtBool, EbpUndefined, EvqConst, 1));
+    return new TIntermTernary(x, y, falseNode);
+}
+
+}  // namespace anonymous
+
+bool UnfoldShortCircuitAST::visitBinary(Visit visit, TIntermBinary *node)
+{
+    TIntermTernary *replacement = nullptr;
+
+    switch (node->getOp())
+    {
+      case EOpLogicalOr:
+        replacement = UnfoldOR(node->getLeft(), node->getRight());
+        break;
+      case EOpLogicalAnd:
+        replacement = UnfoldAND(node->getLeft(), node->getRight());
+        break;
+      default:
+        break;
+    }
+    if (replacement)
+    {
+        queueReplacement(node, replacement, OriginalNode::IS_DROPPED);
+    }
+    return true;
+}