1f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/* 2f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Copyright (C) 2008 The Android Open Source Project 3f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 4f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 5f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * you may not use this file except in compliance with the License. 6f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * You may obtain a copy of the License at 7f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 8f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 9f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 10f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 11f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 12f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * See the License for the specific language governing permissions and 14f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * limitations under the License. 15f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 16f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 17f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/* 18f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Functions for dealing with try-catch info. 19f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 20f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 21f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project#include "DexCatch.h" 22f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 23de75089fb7216d19e9c22cce4dc62a49513477d3Carl Shapiro/* Get the first handler offset for the given DexCode. 24f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * It's not 0 because the handlers list is prefixed with its size 25f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * (in entries) as a uleb128. */ 26f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectu4 dexGetFirstHandlerOffset(const DexCode* pCode) { 27f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (pCode->triesSize == 0) { 28f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return 0; 29f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 30de75089fb7216d19e9c22cce4dc62a49513477d3Carl Shapiro 31f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project const u1* baseData = dexGetCatchHandlerData(pCode); 32f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project const u1* data = baseData; 33f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 34f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project readUnsignedLeb128(&data); 35f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 36f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return data - baseData; 37f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project} 38f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 39f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/* Get count of handler lists for the given DexCode. */ 40f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectu4 dexGetHandlersSize(const DexCode* pCode) { 41f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (pCode->triesSize == 0) { 42f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return 0; 43f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 44f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 45f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project const u1* data = dexGetCatchHandlerData(pCode); 46f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 47f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return readUnsignedLeb128(&data); 48f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project} 49f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 50f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/* Helper for dexFindCatchHandlerOffset(), which does an actual search 51f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * in the tries table. Returns -1 if there is no applicable handler. */ 52f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectint dexFindCatchHandlerOffset0(u2 triesSize, const DexTry* pTries, 53f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project u4 address) { 54f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // Note: Signed type is important for max and min. 55f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int min = 0; 56f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int max = triesSize - 1; 57f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 58f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project while (max >= min) { 59f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int guess = (min + max) >> 1; 60f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project const DexTry* pTry = &pTries[guess]; 61f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project u4 start = pTry->startAddr; 62f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 63f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (address < start) { 64f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project max = guess - 1; 65f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project continue; 66f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 67f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 68f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project u4 end = start + pTry->insnCount; 69f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 70f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (address >= end) { 71f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project min = guess + 1; 72f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project continue; 73f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 74f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 75f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // We have a winner! 76f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return (int) pTry->handlerOff; 77f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 78f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 79f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // No match. 80f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return -1; 81f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project} 82f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 83f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/* Get the handler offset just past the end of the one just iterated over. 84f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * This ends the iteration if it wasn't already. */ 85f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectu4 dexCatchIteratorGetEndOffset(DexCatchIterator* pIterator, 86f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project const DexCode* pCode) { 87f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project while (dexCatchIteratorNext(pIterator) != NULL) /* empty */ ; 88f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 89f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return (u4) (pIterator->pEncodedData - dexGetCatchHandlerData(pCode)); 90f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project} 91