Shih-wei Liao | 4ce024b | 2012-04-25 03:40:50 -0700 | [diff] [blame^] | 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 "Source.h" |
| 18 | |
| 19 | #include <new> |
| 20 | |
| 21 | #include <llvm/Bitcode/ReaderWriter.h> |
| 22 | #include <llvm/LLVMContext.h> |
| 23 | #include <llvm/Linker.h> |
| 24 | #include <llvm/Module.h> |
| 25 | #include <llvm/Support/MemoryBuffer.h> |
| 26 | #include <llvm/Support/system_error.h> |
| 27 | |
| 28 | #include "BCCContext.h" |
| 29 | #include "BCCContextImpl.h" |
| 30 | #include "DebugHelper.h" |
| 31 | |
| 32 | namespace { |
| 33 | |
| 34 | // Helper function to load the bitcode. This uses "bitcode lazy load" feature to |
| 35 | // reduce the startup time. On success, return the LLVM module object created |
| 36 | // and take the ownership of input memory buffer (i.e., pInput). On error, |
| 37 | // return NULL and will NOT take the ownership of pInput. |
| 38 | static inline llvm::Module *helper_load_bitcode(llvm::LLVMContext &pContext, |
| 39 | llvm::MemoryBuffer *pInput) { |
| 40 | std::string error; |
| 41 | llvm::Module *module = llvm::getLazyBitcodeModule(pInput, pContext, &error); |
| 42 | |
| 43 | if (module == NULL) { |
| 44 | ALOGE("Unable to parse the given bitcode file `%s'! (%s)", |
| 45 | pInput->getBufferIdentifier(), error.c_str()); |
| 46 | } |
| 47 | |
| 48 | return module; |
| 49 | } |
| 50 | |
| 51 | } // end anonymous namespace |
| 52 | |
| 53 | namespace bcc { |
| 54 | |
| 55 | Source *Source::CreateFromBuffer(BCCContext &pContext, |
| 56 | const char *pName, |
| 57 | const char *pBitcode, |
| 58 | size_t pBitcodeSize) { |
| 59 | llvm::StringRef input_data(pBitcode, pBitcodeSize); |
| 60 | llvm::MemoryBuffer *input_memory = |
| 61 | llvm::MemoryBuffer::getMemBuffer(input_data, pName); |
| 62 | |
| 63 | if (input_memory == NULL) { |
| 64 | ALOGE("Unable to load bitcode `%s' from buffer!", pName); |
| 65 | return NULL; |
| 66 | } |
| 67 | |
| 68 | llvm::Module *module = helper_load_bitcode(pContext.mImpl->mLLVMContext, |
| 69 | input_memory); |
| 70 | if (module == NULL) { |
| 71 | delete input_memory; |
| 72 | return NULL; |
| 73 | } |
| 74 | |
| 75 | Source *result = CreateFromModule(pContext, *module, /* pNoDelete */false); |
| 76 | if (result == NULL) { |
| 77 | delete module; |
| 78 | } |
| 79 | |
| 80 | return result; |
| 81 | } |
| 82 | |
| 83 | |
| 84 | Source *Source::CreateFromFile(BCCContext &pContext, const std::string &pPath) { |
| 85 | llvm::OwningPtr<llvm::MemoryBuffer> input_data; |
| 86 | |
| 87 | llvm::error_code ec = llvm::MemoryBuffer::getFile(pPath, input_data); |
| 88 | if (ec != llvm::error_code::success()) { |
| 89 | ALOGE("Failed to load bitcode from path %s! (%s)", pPath.c_str(), |
| 90 | ec.message().c_str()); |
| 91 | return NULL; |
| 92 | } |
| 93 | |
| 94 | llvm::MemoryBuffer *input_memory = input_data.take(); |
| 95 | llvm::Module *module = helper_load_bitcode(pContext.mImpl->mLLVMContext, |
| 96 | input_memory); |
| 97 | if (module == NULL) { |
| 98 | delete input_memory; |
| 99 | return NULL; |
| 100 | } |
| 101 | |
| 102 | Source *result = CreateFromModule(pContext, *module, /* pNoDelete */false); |
| 103 | if (result == NULL) { |
| 104 | delete module; |
| 105 | } |
| 106 | |
| 107 | return result; |
| 108 | } |
| 109 | |
| 110 | |
| 111 | Source *Source::CreateFromModule(BCCContext &pContext, llvm::Module &pModule, |
| 112 | bool pNoDelete) { |
| 113 | Source *result = new (std::nothrow) Source(pContext, pModule, pNoDelete); |
| 114 | if (result == NULL) { |
| 115 | ALOGE("Out of memory during Source object allocation for `%s'!", |
| 116 | pModule.getModuleIdentifier().c_str()); |
| 117 | } |
| 118 | return result; |
| 119 | } |
| 120 | |
| 121 | Source::Source(BCCContext &pContext, llvm::Module &pModule, bool pNoDelete) |
| 122 | : mContext(pContext), mModule(&pModule), mNoDelete(pNoDelete) { |
| 123 | pContext.addSource(*this); |
| 124 | } |
| 125 | |
| 126 | Source::~Source() { |
| 127 | mContext.removeSource(*this); |
| 128 | if (!mNoDelete) |
| 129 | delete mModule; |
| 130 | } |
| 131 | |
| 132 | bool Source::merge(Source &pSource, bool pPreserveSource) { |
| 133 | std::string error; |
| 134 | llvm::Linker::LinkerMode mode = |
| 135 | ((pPreserveSource) ? llvm::Linker::PreserveSource : |
| 136 | llvm::Linker::DestroySource); |
| 137 | |
| 138 | if (llvm::Linker::LinkModules(mModule, &pSource.getModule(), |
| 139 | mode, &error) != 0) { |
| 140 | ALOGE("Failed to link source `%s' with `%s' (%s)!", |
| 141 | getIdentifier().c_str(), |
| 142 | pSource.getIdentifier().c_str(), |
| 143 | error.c_str()); |
| 144 | return false; |
| 145 | } |
| 146 | |
| 147 | if (!pPreserveSource) { |
| 148 | pSource.mNoDelete = true; |
| 149 | delete &pSource; |
| 150 | } |
| 151 | |
| 152 | return true; |
| 153 | } |
| 154 | |
| 155 | Source *Source::CreateEmpty(BCCContext &pContext, const std::string &pName) { |
| 156 | // Create an empty module |
| 157 | llvm::Module *module = |
| 158 | new (std::nothrow) llvm::Module(pName, pContext.mImpl->mLLVMContext); |
| 159 | |
| 160 | if (module == NULL) { |
| 161 | ALOGE("Out of memory when creating empty LLVM module `%s'!", pName.c_str()); |
| 162 | return NULL; |
| 163 | } |
| 164 | |
| 165 | Source *result = CreateFromModule(pContext, *module, /* pNoDelete */false); |
| 166 | if (result == NULL) { |
| 167 | delete module; |
| 168 | } |
| 169 | |
| 170 | return result; |
| 171 | } |
| 172 | |
| 173 | const std::string &Source::getIdentifier() const { |
| 174 | return mModule->getModuleIdentifier(); |
| 175 | } |
| 176 | |
| 177 | } // namespace bcc |