Refactor implementation of Statement class heirarchy to use statement block.
Use LLVM double-link with parent list to store statements within a block.
PiperOrigin-RevId: 204515541
diff --git a/lib/IR/StmtBlock.cpp b/lib/IR/StmtBlock.cpp
new file mode 100644
index 0000000..83e0412
--- /dev/null
+++ b/lib/IR/StmtBlock.cpp
@@ -0,0 +1,32 @@
+//===- StmtBlock.cpp - MLIR Statement Instruction Classes -----------------===//
+//
+// Copyright 2019 The MLIR Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// =============================================================================
+
+#include "mlir/IR/MLFunction.h"
+#include "mlir/IR/StmtBlock.h"
+using namespace mlir;
+
+//===----------------------------------------------------------------------===//
+// Statement block
+//===----------------------------------------------------------------------===//
+
+MLFunction *StmtBlock::getFunction() const {
+ StmtBlock *block = const_cast<StmtBlock *>(this);
+
+ while (block->getParent() != nullptr)
+ block = block->getParent()->getBlock();
+ return static_cast<MLFunction *>(block);
+}