1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_COMPILER_DEX_VERIFIED_METHOD_H_ 18 #define ART_COMPILER_DEX_VERIFIED_METHOD_H_ 19 20 #include <vector> 21 22 #include "base/mutex.h" 23 #include "base/safe_map.h" 24 #include "dex/dex_file.h" 25 #include "dex/method_reference.h" 26 27 namespace art { 28 29 namespace verifier { 30 class MethodVerifier; 31 } // namespace verifier 32 33 class VerifiedMethod { 34 public: 35 VerifiedMethod(uint32_t encountered_error_types, bool has_runtime_throw); 36 37 // Cast elision set type. 38 // Since we're adding the dex PCs to the set in increasing order, a sorted vector 39 // is better for performance (not just memory usage), especially for large sets. 40 typedef std::vector<uint32_t> SafeCastSet; 41 42 static const VerifiedMethod* Create(verifier::MethodVerifier* method_verifier) 43 REQUIRES_SHARED(Locks::mutator_lock_); 44 ~VerifiedMethod() = default; 45 46 const SafeCastSet* GetSafeCastSet() const { 47 return safe_cast_set_.get(); 48 } 49 50 // Returns true if the cast can statically be verified to be redundant 51 // by using the check-cast elision peephole optimization in the verifier. 52 bool IsSafeCast(uint32_t pc) const; 53 54 // Returns true if there were any errors during verification. 55 bool HasVerificationFailures() const { 56 return encountered_error_types_ != 0; 57 } 58 59 uint32_t GetEncounteredVerificationFailures() const { 60 return encountered_error_types_; 61 } 62 63 bool HasRuntimeThrow() const { 64 return has_runtime_throw_; 65 } 66 67 private: 68 // Generate safe case set into safe_cast_set_. 69 void GenerateSafeCastSet(verifier::MethodVerifier* method_verifier) 70 REQUIRES_SHARED(Locks::mutator_lock_); 71 72 std::unique_ptr<SafeCastSet> safe_cast_set_; 73 74 const uint32_t encountered_error_types_; 75 const bool has_runtime_throw_; 76 }; 77 78 } // namespace art 79 80 #endif // ART_COMPILER_DEX_VERIFIED_METHOD_H_ 81
