1 /* 2 * Copyright (C) 2012 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 #include "verifier/dex_gc_map.h" 18 19 #include "base/logging.h" 20 21 namespace art { 22 namespace verifier { 23 24 const uint8_t* DexPcToReferenceMap::FindBitMap(uint16_t dex_pc, bool error_if_not_present) const { 25 size_t num_entries = NumEntries(); 26 // Do linear or binary search? 27 static const size_t kSearchThreshold = 8; 28 if (num_entries < kSearchThreshold) { 29 for (size_t i = 0; i < num_entries; i++) { 30 if (GetDexPc(i) == dex_pc) { 31 return GetBitMap(i); 32 } 33 } 34 } else { 35 int lo = 0; 36 int hi = num_entries -1; 37 while (hi >= lo) { 38 int mid = (hi + lo) / 2; 39 int mid_pc = GetDexPc(mid); 40 if (dex_pc > mid_pc) { 41 lo = mid + 1; 42 } else if (dex_pc < mid_pc) { 43 hi = mid - 1; 44 } else { 45 return GetBitMap(mid); 46 } 47 } 48 } 49 if (error_if_not_present) { 50 LOG(ERROR) << "Didn't find reference bit map for dex_pc " << dex_pc; 51 } 52 return NULL; 53 } 54 55 } // namespace verifier 56 } // namespace art 57
