1/* 2 * Copyright 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 "bcc/ExecutionEngine/SymbolResolvers.h" 18 19#include <dlfcn.h> 20 21#include <cassert> 22#include <cstdio> 23#include <new> 24 25using namespace bcc; 26 27//===----------------------------------------------------------------------===// 28// DyldSymbolResolver 29//===----------------------------------------------------------------------===// 30DyldSymbolResolver::DyldSymbolResolver(const char *pFileName, 31 bool pLazyBinding) : mError(NULL) { 32 int flags = (pLazyBinding) ? RTLD_LAZY : RTLD_NOW; 33 34 // Make the symbol within the given library to be local such that it won't 35 // be available for symbol resolution of subsequently loaded libraries. 36 flags |= RTLD_LOCAL; 37 38 mHandle = ::dlopen(pFileName, flags); 39 if (mHandle == NULL) { 40 const char *err = ::dlerror(); 41 42#define DYLD_ERROR_MSG_PATTERN "Failed to load %s! (%s)" 43 size_t error_length = ::strlen(DYLD_ERROR_MSG_PATTERN) + 44 ::strlen(pFileName) + 1; 45 if (err != NULL) { 46 error_length += ::strlen(err); 47 } 48 49 mError = new (std::nothrow) char [error_length]; 50 if (mError != NULL) { 51 ::snprintf(mError, error_length, DYLD_ERROR_MSG_PATTERN, pFileName, 52 ((err != NULL) ? err : "")); 53 } 54 } 55#undef DYLD_ERROR_MSG_PATTERN 56} 57 58void *DyldSymbolResolver::getAddress(const char *pName) { 59 assert((mHandle != NULL) && "Invalid DyldSymbolResolver!"); 60 return ::dlsym(mHandle, pName); 61} 62 63DyldSymbolResolver::~DyldSymbolResolver() { 64 ::dlclose(mHandle); 65 delete [] mError; 66} 67