1 files changed, 98 insertions, 0 deletions
diff --git a/compiler/dex/verified_method.h b/compiler/dex/verified_method.h
new file mode 100644
index 0000000..aa0e72a
--- /dev/null
+++ b/compiler/dex/verified_method.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2014 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.
+ */
+
+#ifndef ART_COMPILER_DEX_VERIFIED_METHOD_H_
+#define ART_COMPILER_DEX_VERIFIED_METHOD_H_
+
+#include <vector>
+
+#include "method_reference.h"
+#include "safe_map.h"
+
+namespace art {
+
+namespace verifier {
+class MethodVerifier;
+}  // namespace verifier
+
+class VerifiedMethod {
+ public:
+  // Cast elision set type.
+  // Since we're adding the dex PCs to the set in increasing order, a sorted vector
+  // is better for performance (not just memory usage), especially for large sets.
+  typedef std::vector<uint32_t> SafeCastSet;
+
+  // Devirtualization map type maps dex offset to concrete method reference.
+  typedef SafeMap<uint32_t, MethodReference> DevirtualizationMap;
+
+  static const VerifiedMethod* Create(verifier::MethodVerifier* method_verifier, bool compile)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  ~VerifiedMethod() = default;
+
+  const std::vector<uint8_t>& GetDexGcMap() const {
+    return dex_gc_map_;
+  }
+
+  const DevirtualizationMap& GetDevirtMap() const {
+    return devirt_map_;
+  }
+
+  const SafeCastSet& GetSafeCastSet() const {
+    return safe_cast_set_;
+  }
+
+  // Returns the devirtualization target method, or nullptr if none.
+  const MethodReference* GetDevirtTarget(uint32_t dex_pc) const;
+
+  // Returns true if the cast can statically be verified to be redundant
+  // by using the check-cast elision peephole optimization in the verifier.
+  bool IsSafeCast(uint32_t pc) const;
+
+ private:
+  VerifiedMethod() = default;
+
+  /*
+   * Generate the GC map for a method that has just been verified (i.e. we're doing this as part of
+   * verification). For type-precise determination we have all the data we need, so we just need to
+   * encode it in some clever fashion.
+   * Stores the data in dex_gc_map_, returns true on success and false on failure.
+   */
+  bool GenerateGcMap(verifier::MethodVerifier* method_verifier);
+
+  // Verify that the GC map associated with method_ is well formed.
+  static void VerifyGcMap(verifier::MethodVerifier* method_verifier,
+                          const std::vector<uint8_t>& data);
+
+  // Compute sizes for GC map data.
+  static void ComputeGcMapSizes(verifier::MethodVerifier* method_verifier,
+                                size_t* gc_points, size_t* ref_bitmap_bits, size_t* log2_max_gc_pc);
+
+  // Generate devirtualizaion map into devirt_map_.
+  void GenerateDevirtMap(verifier::MethodVerifier* method_verifier)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
+  // Generate safe case set into safe_cast_set_.
+  void GenerateSafeCastSet(verifier::MethodVerifier* method_verifier)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
+  std::vector<uint8_t> dex_gc_map_;
+  DevirtualizationMap devirt_map_;
+  SafeCastSet safe_cast_set_;
+};
+
+}  // namespace art
+
+#endif  // ART_COMPILER_DEX_VERIFIED_METHOD_H_