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//===---------- LazyReexports.cpp - Utilities for lazy reexports ----------===//
//
// 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/LazyReexports.h"
#include "llvm/ExecutionEngine/Orc/OrcABISupport.h"
#include "llvm/TargetParser/Triple.h"
#define DEBUG_TYPE "orc"
namespace llvm {
namespace orc {
LazyCallThroughManager::LazyCallThroughManager(ExecutionSession &ES,
ExecutorAddr ErrorHandlerAddr,
TrampolinePool *TP)
: ES(ES), ErrorHandlerAddr(ErrorHandlerAddr), TP(TP) {}
Expected<ExecutorAddr> LazyCallThroughManager::getCallThroughTrampoline(
JITDylib &SourceJD, SymbolStringPtr SymbolName,
NotifyResolvedFunction NotifyResolved) {
assert(TP && "TrampolinePool not set");
std::lock_guard<std::mutex> Lock(LCTMMutex);
auto Trampoline = TP->getTrampoline();
if (!Trampoline)
return Trampoline.takeError();
Reexports[*Trampoline] = ReexportsEntry{&SourceJD, std::move(SymbolName)};
Notifiers[*Trampoline] = std::move(NotifyResolved);
return *Trampoline;
}
ExecutorAddr LazyCallThroughManager::reportCallThroughError(Error Err) {
ES.reportError(std::move(Err));
return ErrorHandlerAddr;
}
Expected<LazyCallThroughManager::ReexportsEntry>
LazyCallThroughManager::findReexport(ExecutorAddr TrampolineAddr) {
std::lock_guard<std::mutex> Lock(LCTMMutex);
auto I = Reexports.find(TrampolineAddr);
if (I == Reexports.end())
return createStringError(inconvertibleErrorCode(),
"Missing reexport for trampoline address %p" +
formatv("{0:x}", TrampolineAddr));
return I->second;
}
Error LazyCallThroughManager::notifyResolved(ExecutorAddr TrampolineAddr,
ExecutorAddr ResolvedAddr) {
NotifyResolvedFunction NotifyResolved;
{
std::lock_guard<std::mutex> Lock(LCTMMutex);
auto I = Notifiers.find(TrampolineAddr);
if (I != Notifiers.end()) {
NotifyResolved = std::move(I->second);
Notifiers.erase(I);
}
}
return NotifyResolved ? NotifyResolved(ResolvedAddr) : Error::success();
}
void LazyCallThroughManager::resolveTrampolineLandingAddress(
ExecutorAddr TrampolineAddr,
NotifyLandingResolvedFunction NotifyLandingResolved) {
auto Entry = findReexport(TrampolineAddr);
if (!Entry)
return NotifyLandingResolved(reportCallThroughError(Entry.takeError()));
// Declaring SLS and the callback outside of the call to ES.lookup is a
// workaround to fix build failures on AIX and on z/OS platforms.
SymbolLookupSet SLS({Entry->SymbolName});
auto Callback = [this, TrampolineAddr, SymbolName = Entry->SymbolName,
NotifyLandingResolved = std::move(NotifyLandingResolved)](
Expected<SymbolMap> Result) mutable {
if (Result) {
assert(Result->size() == 1 && "Unexpected result size");
assert(Result->count(SymbolName) && "Unexpected result value");
ExecutorAddr LandingAddr = (*Result)[SymbolName].getAddress();
if (auto Err = notifyResolved(TrampolineAddr, LandingAddr))
NotifyLandingResolved(reportCallThroughError(std::move(Err)));
else
NotifyLandingResolved(LandingAddr);
} else {
NotifyLandingResolved(reportCallThroughError(Result.takeError()));
}
};
ES.lookup(LookupKind::Static,
makeJITDylibSearchOrder(Entry->SourceJD,
JITDylibLookupFlags::MatchAllSymbols),
std::move(SLS), SymbolState::Ready, std::move(Callback),
NoDependenciesToRegister);
}
Expected<std::unique_ptr<LazyCallThroughManager>>
createLocalLazyCallThroughManager(const Triple &T, ExecutionSession &ES,
ExecutorAddr ErrorHandlerAddr) {
switch (T.getArch()) {
default:
return make_error<StringError>(
std::string("No callback manager available for ") + T.str(),
inconvertibleErrorCode());
case Triple::aarch64:
case Triple::aarch64_32:
return LocalLazyCallThroughManager::Create<OrcAArch64>(ES,
ErrorHandlerAddr);
case Triple::x86:
return LocalLazyCallThroughManager::Create<OrcI386>(ES, ErrorHandlerAddr);
case Triple::loongarch64:
return LocalLazyCallThroughManager::Create<OrcLoongArch64>(
ES, ErrorHandlerAddr);
case Triple::mips:
return LocalLazyCallThroughManager::Create<OrcMips32Be>(ES,
ErrorHandlerAddr);
case Triple::mipsel:
return LocalLazyCallThroughManager::Create<OrcMips32Le>(ES,
ErrorHandlerAddr);
case Triple::mips64:
case Triple::mips64el:
return LocalLazyCallThroughManager::Create<OrcMips64>(ES, ErrorHandlerAddr);
case Triple::riscv64:
return LocalLazyCallThroughManager::Create<OrcRiscv64>(ES,
ErrorHandlerAddr);
case Triple::x86_64:
if (T.getOS() == Triple::OSType::Win32)
return LocalLazyCallThroughManager::Create<OrcX86_64_Win32>(
ES, ErrorHandlerAddr);
else
return LocalLazyCallThroughManager::Create<OrcX86_64_SysV>(
ES, ErrorHandlerAddr);
}
}
LazyReexportsMaterializationUnit::LazyReexportsMaterializationUnit(
LazyCallThroughManager &LCTManager, IndirectStubsManager &ISManager,
JITDylib &SourceJD, SymbolAliasMap CallableAliases, ImplSymbolMap *SrcJDLoc)
: MaterializationUnit(extractFlags(CallableAliases)),
LCTManager(LCTManager), ISManager(ISManager), SourceJD(SourceJD),
CallableAliases(std::move(CallableAliases)), AliaseeTable(SrcJDLoc) {}
StringRef LazyReexportsMaterializationUnit::getName() const {
return "<Lazy Reexports>";
}
void LazyReexportsMaterializationUnit::materialize(
std::unique_ptr<MaterializationResponsibility> R) {
auto RequestedSymbols = R->getRequestedSymbols();
SymbolAliasMap RequestedAliases;
for (auto &RequestedSymbol : RequestedSymbols) {
auto I = CallableAliases.find(RequestedSymbol);
assert(I != CallableAliases.end() && "Symbol not found in alias map?");
RequestedAliases[I->first] = std::move(I->second);
CallableAliases.erase(I);
}
if (!CallableAliases.empty())
if (auto Err = R->replace(lazyReexports(LCTManager, ISManager, SourceJD,
std::move(CallableAliases),
AliaseeTable))) {
R->getExecutionSession().reportError(std::move(Err));
R->failMaterialization();
return;
}
IndirectStubsManager::StubInitsMap StubInits;
for (auto &Alias : RequestedAliases) {
auto CallThroughTrampoline = LCTManager.getCallThroughTrampoline(
SourceJD, Alias.second.Aliasee,
[&ISManager = this->ISManager,
StubSym = Alias.first](ExecutorAddr ResolvedAddr) -> Error {
return ISManager.updatePointer(*StubSym, ResolvedAddr);
});
if (!CallThroughTrampoline) {
SourceJD.getExecutionSession().reportError(
CallThroughTrampoline.takeError());
R->failMaterialization();
return;
}
StubInits[*Alias.first] =
std::make_pair(*CallThroughTrampoline, Alias.second.AliasFlags);
}
if (AliaseeTable != nullptr && !RequestedAliases.empty())
AliaseeTable->trackImpls(RequestedAliases, &SourceJD);
if (auto Err = ISManager.createStubs(StubInits)) {
SourceJD.getExecutionSession().reportError(std::move(Err));
R->failMaterialization();
return;
}
SymbolMap Stubs;
for (auto &Alias : RequestedAliases)
Stubs[Alias.first] = ISManager.findStub(*Alias.first, false);
// No registered dependencies, so these calls cannot fail.
cantFail(R->notifyResolved(Stubs));
cantFail(R->notifyEmitted());
}
void LazyReexportsMaterializationUnit::discard(const JITDylib &JD,
const SymbolStringPtr &Name) {
assert(CallableAliases.count(Name) &&
"Symbol not covered by this MaterializationUnit");
CallableAliases.erase(Name);
}
MaterializationUnit::Interface
LazyReexportsMaterializationUnit::extractFlags(const SymbolAliasMap &Aliases) {
SymbolFlagsMap SymbolFlags;
for (auto &KV : Aliases) {
assert(KV.second.AliasFlags.isCallable() &&
"Lazy re-exports must be callable symbols");
SymbolFlags[KV.first] = KV.second.AliasFlags;
}
return MaterializationUnit::Interface(std::move(SymbolFlags), nullptr);
}
} // End namespace orc.
} // End namespace llvm.
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