1 /* 2 * Copyright 2010-2012, 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/Script.h" 18 19 #include "Assert.h" 20 #include "Log.h" 21 22 #include "bcc/CompilerConfig.h" 23 #include "bcc/Source.h" 24 25 #include "bcinfo/MetadataExtractor.h" 26 27 #include <llvm/IR/Module.h> 28 29 using namespace bcc; 30 31 Script::Script(Source *pSource) 32 : mSource(pSource), 33 mOptimizationLevel(llvm::CodeGenOpt::Aggressive), 34 mLinkRuntimeCallback(nullptr), mEmbedInfo(false), mEmbedGlobalInfo(false), 35 mEmbedGlobalInfoSkipConstant(false) {} 36 37 bool Script::LinkRuntime(const char *core_lib) { 38 bccAssert(core_lib != nullptr); 39 40 // Using the same context with the source. 41 BCCContext &context = mSource->getContext(); 42 43 Source *libclcore_source = Source::CreateFromFile(context, core_lib); 44 if (libclcore_source == nullptr) { 45 ALOGE("Failed to load Renderscript library '%s' to link!", core_lib); 46 return false; 47 } 48 49 if (mLinkRuntimeCallback != nullptr) { 50 mLinkRuntimeCallback(this, &mSource->getModule(), 51 &libclcore_source->getModule()); 52 } 53 54 // For every named metadata node in the source (libclcore_source), 55 // the merge process ensures there is a same-named metadata node in 56 // the destination (mSource) (creating it if necessary) and appends 57 // all of the source node's operands to the end of the destination 58 // node's operands. In the case of the wrapper metadata 59 // 60 // kWrapperMetadataName -> (compilerVersion, optimizationLevel) 61 // 62 // this is not the behavior we want. Instead, we want to retain the 63 // source wrapper metadata: 64 // - compiler version in libclcore_source is 0, a nonsensical value. 65 // As documented in slang_version.h, libclcore_source must not 66 // violate any compiler version guarantees, so the right thing to 67 // do is retain the compiler version from source, which specifies 68 // which guarantees source (and hence the merged code) satisfies. 69 // See frameworks/rs/driver/README.txt regarding libclcore_source 70 // obeying compiler version guarantees. 71 // - optimization level in source and libclcore_source is meaningful. 72 // We simply define the optimization level in the linked code to 73 // be the optimization level of source. 74 // The easiest way to retain the source wrapper metadata is to delete 75 // the libclcore_source wrapper metadata. 76 llvm::Module &libclcore_module = libclcore_source->getModule(); 77 llvm::NamedMDNode *const wrapperMDNode = 78 libclcore_module.getNamedMetadata(bcinfo::MetadataExtractor::kWrapperMetadataName); 79 bccAssert(wrapperMDNode != nullptr); 80 libclcore_module.eraseNamedMetadata(wrapperMDNode); 81 if (!mSource->merge(*libclcore_source)) { 82 ALOGE("Failed to link Renderscript library '%s'!", core_lib); 83 delete libclcore_source; 84 return false; 85 } 86 87 return true; 88 } 89 90 bool Script::mergeSource(Source &pSource) { return mSource->merge(pSource); } 91
