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//===-- RTDyldObjectLinkingLayer.cpp - RuntimeDyld backed ORC ObjectLayer -===//
//
// 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/RTDyldObjectLinkingLayer.h"
namespace {
using namespace llvm;
using namespace llvm::orc;
class JITDylibSearchOrderResolver : public JITSymbolResolver {
public:
JITDylibSearchOrderResolver(MaterializationResponsibility &MR) : MR(MR) {}
void lookup(const LookupSet &Symbols, OnResolvedFunction OnResolved) {
auto &ES = MR.getTargetJITDylib().getExecutionSession();
SymbolNameSet InternedSymbols;
// Intern the requested symbols: lookup takes interned strings.
for (auto &S : Symbols)
InternedSymbols.insert(ES.intern(S));
// Build an OnResolve callback to unwrap the interned strings and pass them
// to the OnResolved callback.
// FIXME: Switch to move capture of OnResolved once we have c++14.
auto OnResolvedWithUnwrap =
[OnResolved](Expected<SymbolMap> InternedResult) {
if (!InternedResult) {
OnResolved(InternedResult.takeError());
return;
}
LookupResult Result;
for (auto &KV : *InternedResult)
Result[*KV.first] = std::move(KV.second);
OnResolved(Result);
};
// We're not waiting for symbols to be ready. Just log any errors.
auto OnReady = [&ES](Error Err) { ES.reportError(std::move(Err)); };
// Register dependencies for all symbols contained in this set.
auto RegisterDependencies = [&](const SymbolDependenceMap &Deps) {
MR.addDependenciesForAll(Deps);
};
JITDylibSearchList SearchOrder;
MR.getTargetJITDylib().withSearchOrderDo(
[&](const JITDylibSearchList &JDs) { SearchOrder = JDs; });
ES.lookup(SearchOrder, InternedSymbols, OnResolvedWithUnwrap, OnReady,
RegisterDependencies);
}
Expected<LookupSet> getResponsibilitySet(const LookupSet &Symbols) {
LookupSet Result;
for (auto &KV : MR.getSymbols()) {
if (Symbols.count(*KV.first))
Result.insert(*KV.first);
}
return Result;
}
private:
MaterializationResponsibility &MR;
};
} // end anonymous namespace
namespace llvm {
namespace orc {
RTDyldObjectLinkingLayer::RTDyldObjectLinkingLayer(
ExecutionSession &ES, GetMemoryManagerFunction GetMemoryManager,
NotifyLoadedFunction NotifyLoaded, NotifyEmittedFunction NotifyEmitted)
: ObjectLayer(ES), GetMemoryManager(GetMemoryManager),
NotifyLoaded(std::move(NotifyLoaded)),
NotifyEmitted(std::move(NotifyEmitted)) {}
void RTDyldObjectLinkingLayer::emit(MaterializationResponsibility R,
std::unique_ptr<MemoryBuffer> O) {
assert(O && "Object must not be null");
// This method launches an asynchronous link step that will fulfill our
// materialization responsibility. We need to switch R to be heap
// allocated before that happens so it can live as long as the asynchronous
// link needs it to (i.e. it must be able to outlive this method).
auto SharedR = std::make_shared<MaterializationResponsibility>(std::move(R));
auto &ES = getExecutionSession();
auto Obj = object::ObjectFile::createObjectFile(*O);
if (!Obj) {
getExecutionSession().reportError(Obj.takeError());
SharedR->failMaterialization();
return;
}
// Collect the internal symbols from the object file: We will need to
// filter these later.
auto InternalSymbols = std::make_shared<std::set<StringRef>>();
{
for (auto &Sym : (*Obj)->symbols()) {
if (!(Sym.getFlags() & object::BasicSymbolRef::SF_Global)) {
if (auto SymName = Sym.getName())
InternalSymbols->insert(*SymName);
else {
ES.reportError(SymName.takeError());
R.failMaterialization();
return;
}
}
}
}
auto K = R.getVModuleKey();
RuntimeDyld::MemoryManager *MemMgr = nullptr;
// Create a record a memory manager for this object.
{
auto Tmp = GetMemoryManager();
std::lock_guard<std::mutex> Lock(RTDyldLayerMutex);
MemMgrs.push_back(std::move(Tmp));
MemMgr = MemMgrs.back().get();
}
JITDylibSearchOrderResolver Resolver(*SharedR);
/* Thoughts on proper cross-dylib weak symbol handling:
*
* Change selection of canonical defs to be a manually triggered process, and
* add a 'canonical' bit to symbol definitions. When canonical def selection
* is triggered, sweep the JITDylibs to mark defs as canonical, discard
* duplicate defs.
*/
jitLinkForORC(
**Obj, std::move(O), *MemMgr, Resolver, ProcessAllSections,
[this, K, SharedR, &Obj, InternalSymbols](
std::unique_ptr<RuntimeDyld::LoadedObjectInfo> LoadedObjInfo,
std::map<StringRef, JITEvaluatedSymbol> ResolvedSymbols) {
return onObjLoad(K, *SharedR, **Obj, std::move(LoadedObjInfo),
ResolvedSymbols, *InternalSymbols);
},
[this, K, SharedR](Error Err) {
onObjEmit(K, *SharedR, std::move(Err));
});
}
Error RTDyldObjectLinkingLayer::onObjLoad(
VModuleKey K, MaterializationResponsibility &R, object::ObjectFile &Obj,
std::unique_ptr<RuntimeDyld::LoadedObjectInfo> LoadedObjInfo,
std::map<StringRef, JITEvaluatedSymbol> Resolved,
std::set<StringRef> &InternalSymbols) {
SymbolFlagsMap ExtraSymbolsToClaim;
SymbolMap Symbols;
for (auto &KV : Resolved) {
// Scan the symbols and add them to the Symbols map for resolution.
// We never claim internal symbols.
if (InternalSymbols.count(KV.first))
continue;
auto InternedName = getExecutionSession().intern(KV.first);
auto Flags = KV.second.getFlags();
// Override object flags and claim responsibility for symbols if
// requested.
if (OverrideObjectFlags || AutoClaimObjectSymbols) {
auto I = R.getSymbols().find(InternedName);
if (OverrideObjectFlags && I != R.getSymbols().end())
Flags = JITSymbolFlags::stripTransientFlags(I->second);
else if (AutoClaimObjectSymbols && I == R.getSymbols().end())
ExtraSymbolsToClaim[InternedName] = Flags;
}
Symbols[InternedName] = JITEvaluatedSymbol(KV.second.getAddress(), Flags);
}
if (!ExtraSymbolsToClaim.empty())
if (auto Err = R.defineMaterializing(ExtraSymbolsToClaim))
return Err;
R.resolve(Symbols);
if (NotifyLoaded)
NotifyLoaded(K, Obj, *LoadedObjInfo);
return Error::success();
}
void RTDyldObjectLinkingLayer::onObjEmit(VModuleKey K,
MaterializationResponsibility &R,
Error Err) {
if (Err) {
getExecutionSession().reportError(std::move(Err));
R.failMaterialization();
return;
}
R.emit();
if (NotifyEmitted)
NotifyEmitted(K);
}
} // End namespace orc.
} // End namespace llvm.
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