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//===----- JITLinkReentryTrampolines.cpp -- JITLink-based trampoline- -----===//
//
// 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/JITLinkReentryTrampolines.h"
#include "llvm/ExecutionEngine/JITLink/aarch64.h"
#include "llvm/ExecutionEngine/JITLink/x86_64.h"
#include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h"
#include <memory>
#define DEBUG_TYPE "orc"
using namespace llvm;
using namespace llvm::jitlink;
namespace {
constexpr StringRef ReentryFnName = "__orc_rt_reenter";
constexpr StringRef ReentrySectionName = "__orc_stubs";
} // namespace
namespace llvm::orc {
class JITLinkReentryTrampolines::TrampolineAddrScraperPlugin
: public ObjectLinkingLayer::Plugin {
public:
void modifyPassConfig(MaterializationResponsibility &MR,
jitlink::LinkGraph &G,
jitlink::PassConfiguration &Config) override {
Config.PreFixupPasses.push_back(
[this](LinkGraph &G) { return recordTrampolineAddrs(G); });
}
Error notifyFailed(MaterializationResponsibility &MR) override {
return Error::success();
}
Error notifyRemovingResources(JITDylib &JD, ResourceKey K) override {
return Error::success();
}
void notifyTransferringResources(JITDylib &JD, ResourceKey DstKey,
ResourceKey SrcKey) override {}
void registerGraph(LinkGraph &G,
std::shared_ptr<std::vector<ExecutorSymbolDef>> Addrs) {
std::lock_guard<std::mutex> Lock(M);
assert(!PendingAddrs.count(&G) && "Duplicate registration");
PendingAddrs[&G] = std::move(Addrs);
}
Error recordTrampolineAddrs(LinkGraph &G) {
std::shared_ptr<std::vector<ExecutorSymbolDef>> Addrs;
{
std::lock_guard<std::mutex> Lock(M);
auto I = PendingAddrs.find(&G);
if (I == PendingAddrs.end())
return Error::success();
Addrs = std::move(I->second);
PendingAddrs.erase(I);
}
auto *Sec = G.findSectionByName(ReentrySectionName);
assert(Sec && "Reentry graph missing reentry section");
assert(!Sec->empty() && "Reentry graph is empty");
for (auto *Sym : Sec->symbols())
if (!Sym->hasName())
Addrs->push_back({Sym->getAddress(), JITSymbolFlags()});
return Error::success();
}
private:
std::mutex M;
DenseMap<LinkGraph *, std::shared_ptr<std::vector<ExecutorSymbolDef>>>
PendingAddrs;
};
Expected<std::unique_ptr<JITLinkReentryTrampolines>>
JITLinkReentryTrampolines::Create(ObjectLinkingLayer &ObjLinkingLayer) {
EmitTrampolineFn EmitTrampoline;
const auto &TT = ObjLinkingLayer.getExecutionSession().getTargetTriple();
switch (TT.getArch()) {
case Triple::aarch64:
EmitTrampoline = aarch64::createAnonymousReentryTrampoline;
break;
case Triple::x86_64:
EmitTrampoline = x86_64::createAnonymousReentryTrampoline;
break;
default:
return make_error<StringError>("JITLinkReentryTrampolines: architecture " +
TT.getArchName() + " not supported",
inconvertibleErrorCode());
}
return std::make_unique<JITLinkReentryTrampolines>(ObjLinkingLayer,
std::move(EmitTrampoline));
}
JITLinkReentryTrampolines::JITLinkReentryTrampolines(
ObjectLinkingLayer &ObjLinkingLayer, EmitTrampolineFn EmitTrampoline)
: ObjLinkingLayer(ObjLinkingLayer),
EmitTrampoline(std::move(EmitTrampoline)) {
auto TAS = std::make_shared<TrampolineAddrScraperPlugin>();
TrampolineAddrScraper = TAS.get();
ObjLinkingLayer.addPlugin(std::move(TAS));
}
void JITLinkReentryTrampolines::emit(ResourceTrackerSP RT,
size_t NumTrampolines,
OnTrampolinesReadyFn OnTrampolinesReady) {
if (NumTrampolines == 0)
return OnTrampolinesReady(std::vector<ExecutorSymbolDef>());
JITDylibSP JD(&RT->getJITDylib());
auto &ES = ObjLinkingLayer.getExecutionSession();
auto ReentryGraphSym =
ES.intern(("__orc_reentry_graph_#" + Twine(++ReentryGraphIdx)).str());
auto G = std::make_unique<jitlink::LinkGraph>(
(*ReentryGraphSym).str(), ES.getSymbolStringPool(), ES.getTargetTriple(),
SubtargetFeatures(), jitlink::getGenericEdgeKindName);
auto &ReentryFnSym = G->addExternalSymbol(ReentryFnName, 0, false);
auto &ReentrySection =
G->createSection(ReentrySectionName, MemProt::Exec | MemProt::Read);
for (size_t I = 0; I != NumTrampolines; ++I)
EmitTrampoline(*G, ReentrySection, ReentryFnSym).setLive(true);
auto &FirstBlock = **ReentrySection.blocks().begin();
G->addDefinedSymbol(FirstBlock, 0, *ReentryGraphSym, FirstBlock.getSize(),
Linkage::Strong, Scope::SideEffectsOnly, true, true);
auto TrampolineAddrs = std::make_shared<std::vector<ExecutorSymbolDef>>();
TrampolineAddrScraper->registerGraph(*G, TrampolineAddrs);
// Add Graph via object linking layer.
if (auto Err = ObjLinkingLayer.add(std::move(RT), std::move(G)))
return OnTrampolinesReady(std::move(Err));
// Trigger graph emission.
ES.lookup(
LookupKind::Static, {{JD.get(), JITDylibLookupFlags::MatchAllSymbols}},
SymbolLookupSet(ReentryGraphSym,
SymbolLookupFlags::WeaklyReferencedSymbol),
SymbolState::Ready,
[OnTrampolinesReady = std::move(OnTrampolinesReady),
TrampolineAddrs =
std::move(TrampolineAddrs)](Expected<SymbolMap> Result) mutable {
if (Result)
OnTrampolinesReady(std::move(*TrampolineAddrs));
else
OnTrampolinesReady(Result.takeError());
},
NoDependenciesToRegister);
}
Expected<std::unique_ptr<LazyReexportsManager>>
createJITLinkLazyReexportsManager(ObjectLinkingLayer &ObjLinkingLayer,
RedirectableSymbolManager &RSMgr,
JITDylib &PlatformJD,
LazyReexportsManager::Listener *L) {
auto JLT = JITLinkReentryTrampolines::Create(ObjLinkingLayer);
if (!JLT)
return JLT.takeError();
return LazyReexportsManager::Create(
[JLT = std::move(*JLT)](ResourceTrackerSP RT, size_t NumTrampolines,
LazyReexportsManager::OnTrampolinesReadyFn
OnTrampolinesReady) mutable {
JLT->emit(std::move(RT), NumTrampolines, std::move(OnTrampolinesReady));
},
RSMgr, PlatformJD, L);
}
} // namespace llvm::orc
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