Merge "Merge remote-tracking branch 'origin/5.12' into dev" into refs/staging/dev

1 files changed, 56 insertions, 0 deletions

diff --git a/src/3rdparty/angle/src/compiler/translator/RemoveEmptySwitchStatements.cpp b/src/3rdparty/angle/src/compiler/translator/RemoveEmptySwitchStatements.cpp
new file mode 100644
index 0000000000..b39c912e9c
--- /dev/null
+++ b/src/3rdparty/angle/src/compiler/translator/RemoveEmptySwitchStatements.cpp
@@ -0,0 +1,56 @@
+//
+// Copyright (c) 2017 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.
+//
+// RemoveEmptySwitchStatements.cpp: Remove switch statements that have an empty statement list.
+
+#include "compiler/translator/RemoveEmptySwitchStatements.h"
+
+#include "compiler/translator/IntermTraverse.h"
+
+namespace sh
+{
+
+namespace
+{
+
+class RemoveEmptySwitchStatementsTraverser : public TIntermTraverser
+{
+  public:
+    RemoveEmptySwitchStatementsTraverser() : TIntermTraverser(true, false, false) {}
+
+    bool visitSwitch(Visit visit, TIntermSwitch *node);
+};
+
+bool RemoveEmptySwitchStatementsTraverser::visitSwitch(Visit visit, TIntermSwitch *node)
+{
+    if (node->getStatementList()->getSequence()->empty())
+    {
+        // Just output the init statement.
+        if (node->getInit()->hasSideEffects())
+        {
+            queueReplacement(node->getInit(), OriginalNode::IS_DROPPED);
+        }
+        else
+        {
+            TIntermSequence emptyReplacement;
+            ASSERT(getParentNode()->getAsBlock());
+            mMultiReplacements.push_back(NodeReplaceWithMultipleEntry(getParentNode()->getAsBlock(),
+                                                                      node, emptyReplacement));
+        }
+        return false;  // Nothing inside the child nodes to traverse.
+    }
+    return true;
+}
+
+}  // anonymous namespace
+
+void RemoveEmptySwitchStatements(TIntermBlock *root)
+{
+    RemoveEmptySwitchStatementsTraverser traverser;
+    root->traverse(&traverser);
+    traverser.updateTree();
+}
+
+}  // namespace sh