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diff --git a/vm/analysis/VfyBasicBlock.h b/vm/analysis/VfyBasicBlock.h
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+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * 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.
+ */
+
+/*
+ * Basic block functions, as used by the verifier.  (The names were chosen
+ * to avoid conflicts with similar structures used by the compiler.)
+ */
+#ifndef DALVIK_VFYBASICBLOCK_H_
+#define DALVIK_VFYBASICBLOCK_H_
+
+#include "PointerSet.h"
+
+struct VerifierData;
+
+
+/*
+ * Structure representing a basic block.
+ *
+ * This is used for liveness analysis, which is a reverse-flow algorithm,
+ * so we need to mantain a list of predecessors for each block.
+ *
+ * "liveRegs" indicates the set of registers that are live at the end of
+ * the basic block (after the last instruction has executed).  Successor
+ * blocks will compare their results with this to see if this block needs
+ * to be re-evaluated.  Note that this is not the same as the contents of
+ * the RegisterLine for the last instruction in the block (which reflects
+ * the state *before* the instruction has executed).
+ */
+struct VfyBasicBlock {
+    u4              firstAddr;      /* address of first instruction */
+    u4              lastAddr;       /* address of last instruction */
+    PointerSet*     predecessors;   /* set of basic blocks that can flow here */
+    BitVector*      liveRegs;       /* liveness for each register */
+    bool            changed;        /* input set has changed, must re-eval */
+    bool            visited;        /* block has been visited at least once */
+};
+
+/*
+ * Generate a list of basic blocks.
+ */
+bool dvmComputeVfyBasicBlocks(struct VerifierData* vdata);
+
+/*
+ * Free storage allocated by dvmComputeVfyBasicBlocks.
+ */
+void dvmFreeVfyBasicBlocks(struct VerifierData* vdata);
+
+#endif  // DALVIK_VFYBASICBLOCK_H_