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
25 using namespace bcc;
26
27 //===----------------------------------------------------------------------===//
28 // DyldSymbolResolver
29 //===----------------------------------------------------------------------===//
DyldSymbolResolver(const char * pFileName,bool pLazyBinding)30 DyldSymbolResolver::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
getAddress(const char * pName)58 void *DyldSymbolResolver::getAddress(const char *pName) {
59 assert((mHandle != NULL) && "Invalid DyldSymbolResolver!");
60 return ::dlsym(mHandle, pName);
61 }
62
~DyldSymbolResolver()63 DyldSymbolResolver::~DyldSymbolResolver() {
64 ::dlclose(mHandle);
65 delete [] mError;
66 }
67