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//===-- ThreadSafeModule.cpp - Thread safe Module, Context, and Utilities -===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/Orc/ThreadSafeModule.h"
#include "llvm/Bitcode/BitcodeReader.h"
#include "llvm/Bitcode/BitcodeWriter.h"
#include "llvm/Transforms/Utils/Cloning.h"
namespace llvm {
namespace orc {
static std::pair<std::string, SmallVector<char, 1>>
serializeModule(const Module &M, GVPredicate ShouldCloneDef,
GVModifier UpdateClonedDefSource) {
std::string ModuleName;
SmallVector<char, 1> ClonedModuleBuffer;
ModuleName = M.getModuleIdentifier();
std::set<GlobalValue *> ClonedDefsInSrc;
ValueToValueMapTy VMap;
auto Tmp = CloneModule(M, VMap, [&](const GlobalValue *GV) {
if (ShouldCloneDef(*GV)) {
ClonedDefsInSrc.insert(const_cast<GlobalValue *>(GV));
return true;
}
return false;
});
if (UpdateClonedDefSource)
for (auto *GV : ClonedDefsInSrc)
UpdateClonedDefSource(*GV);
BitcodeWriter BCWriter(ClonedModuleBuffer);
BCWriter.writeModule(*Tmp);
BCWriter.writeSymtab();
BCWriter.writeStrtab();
return {std::move(ModuleName), std::move(ClonedModuleBuffer)};
}
ThreadSafeModule
deserializeModule(std::string ModuleName,
const SmallVector<char, 1> &ClonedModuleBuffer,
ThreadSafeContext TSCtx) {
MemoryBufferRef ClonedModuleBufferRef(
StringRef(ClonedModuleBuffer.data(), ClonedModuleBuffer.size()),
"cloned module buffer");
// Then parse the buffer into the new Module.
auto M = TSCtx.withContextDo([&](LLVMContext *Ctx) {
assert(Ctx && "No LLVMContext provided");
auto TmpM = cantFail(parseBitcodeFile(ClonedModuleBufferRef, *Ctx));
TmpM->setModuleIdentifier(ModuleName);
return TmpM;
});
return ThreadSafeModule(std::move(M), std::move(TSCtx));
}
ThreadSafeModule
cloneExternalModuleToContext(const Module &M, ThreadSafeContext TSCtx,
GVPredicate ShouldCloneDef,
GVModifier UpdateClonedDefSource) {
if (!ShouldCloneDef)
ShouldCloneDef = [](const GlobalValue &) { return true; };
auto [ModuleName, ClonedModuleBuffer] = serializeModule(
M, std::move(ShouldCloneDef), std::move(UpdateClonedDefSource));
return deserializeModule(std::move(ModuleName), ClonedModuleBuffer,
std::move(TSCtx));
}
ThreadSafeModule cloneToContext(const ThreadSafeModule &TSM,
ThreadSafeContext TSCtx,
GVPredicate ShouldCloneDef,
GVModifier UpdateClonedDefSource) {
assert(TSM && "Can not clone null module");
if (!ShouldCloneDef)
ShouldCloneDef = [](const GlobalValue &) { return true; };
// First copy the source module into a buffer.
auto [ModuleName, ClonedModuleBuffer] = TSM.withModuleDo([&](Module &M) {
return serializeModule(M, std::move(ShouldCloneDef),
std::move(UpdateClonedDefSource));
});
return deserializeModule(std::move(ModuleName), ClonedModuleBuffer,
std::move(TSCtx));
}
ThreadSafeModule cloneToNewContext(const ThreadSafeModule &TSM,
GVPredicate ShouldCloneDef,
GVModifier UpdateClonedDefSource) {
assert(TSM && "Can not clone null module");
ThreadSafeContext TSCtx(std::make_unique<LLVMContext>());
return cloneToContext(TSM, std::move(TSCtx), std::move(ShouldCloneDef),
std::move(UpdateClonedDefSource));
}
} // end namespace orc
} // end namespace llvm
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