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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/ADT/Triple.h"
#include "llvm/ExecutionEngine/Orc/OrcABISupport.h"
#define DEBUG_TYPE "orc"
namespace llvm {
namespace orc {
void LazyCallThroughManager::NotifyResolvedFunction::anchor() {}
LazyCallThroughManager::LazyCallThroughManager(
ExecutionSession &ES, JITTargetAddress ErrorHandlerAddr,
std::unique_ptr<TrampolinePool> TP)
: ES(ES), ErrorHandlerAddr(ErrorHandlerAddr), TP(std::move(TP)) {}
Expected<JITTargetAddress> LazyCallThroughManager::getCallThroughTrampoline(
JITDylib &SourceJD, SymbolStringPtr SymbolName,
std::shared_ptr<NotifyResolvedFunction> NotifyResolved) {
std::lock_guard<std::mutex> Lock(LCTMMutex);
auto Trampoline = TP->getTrampoline();
if (!Trampoline)
return Trampoline.takeError();
Reexports[*Trampoline] = std::make_pair(&SourceJD, std::move(SymbolName));
Notifiers[*Trampoline] = std::move(NotifyResolved);
return *Trampoline;
}
JITTargetAddress
LazyCallThroughManager::callThroughToSymbol(JITTargetAddress TrampolineAddr) {
JITDylib *SourceJD = nullptr;
SymbolStringPtr SymbolName;
{
std::lock_guard<std::mutex> Lock(LCTMMutex);
auto I = Reexports.find(TrampolineAddr);
if (I == Reexports.end())
return ErrorHandlerAddr;
SourceJD = I->second.first;
SymbolName = I->second.second;
}
auto LookupResult =
ES.lookup(JITDylibSearchList({{SourceJD, true}}), SymbolName);
if (!LookupResult) {
ES.reportError(LookupResult.takeError());
return ErrorHandlerAddr;
}
auto ResolvedAddr = LookupResult->getAddress();
std::shared_ptr<NotifyResolvedFunction> NotifyResolved = nullptr;
{
std::lock_guard<std::mutex> Lock(LCTMMutex);
auto I = Notifiers.find(TrampolineAddr);
if (I != Notifiers.end()) {
NotifyResolved = I->second;
Notifiers.erase(I);
}
}
if (NotifyResolved) {
if (auto Err = (*NotifyResolved)(*SourceJD, SymbolName, ResolvedAddr)) {
ES.reportError(std::move(Err));
return ErrorHandlerAddr;
}
}
return ResolvedAddr;
}
Expected<std::unique_ptr<LazyCallThroughManager>>
createLocalLazyCallThroughManager(const Triple &T, ExecutionSession &ES,
JITTargetAddress ErrorHandlerAddr) {
switch (T.getArch()) {
default:
return make_error<StringError>(
std::string("No callback manager available for ") + T.str(),
inconvertibleErrorCode());
case Triple::aarch64:
return LocalLazyCallThroughManager::Create<OrcAArch64>(ES,
ErrorHandlerAddr);
case Triple::x86:
return LocalLazyCallThroughManager::Create<OrcI386>(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::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, VModuleKey K)
: MaterializationUnit(extractFlags(CallableAliases), std::move(K)),
LCTManager(LCTManager), ISManager(ISManager), SourceJD(SourceJD),
CallableAliases(std::move(CallableAliases)),
NotifyResolved(LazyCallThroughManager::createNotifyResolvedFunction(
[&ISManager](JITDylib &JD, const SymbolStringPtr &SymbolName,
JITTargetAddress ResolvedAddr) {
return ISManager.updatePointer(*SymbolName, ResolvedAddr);
})) {}
StringRef LazyReexportsMaterializationUnit::getName() const {
return "<Lazy Reexports>";
}
void LazyReexportsMaterializationUnit::materialize(
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())
R.replace(lazyReexports(LCTManager, ISManager, SourceJD,
std::move(CallableAliases)));
IndirectStubsManager::StubInitsMap StubInits;
for (auto &Alias : RequestedAliases) {
auto CallThroughTrampoline = LCTManager.getCallThroughTrampoline(
SourceJD, Alias.second.Aliasee, NotifyResolved);
if (!CallThroughTrampoline) {
SourceJD.getExecutionSession().reportError(
CallThroughTrampoline.takeError());
R.failMaterialization();
return;
}
StubInits[*Alias.first] =
std::make_pair(*CallThroughTrampoline, Alias.second.AliasFlags);
}
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);
R.notifyResolved(Stubs);
R.notifyEmitted();
}
void LazyReexportsMaterializationUnit::discard(const JITDylib &JD,
const SymbolStringPtr &Name) {
assert(CallableAliases.count(Name) &&
"Symbol not covered by this MaterializationUnit");
CallableAliases.erase(Name);
}
SymbolFlagsMap
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 SymbolFlags;
}
} // End namespace orc.
} // End namespace llvm.
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