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//===-------------------- Layer.cpp - Layer interfaces --------------------===//
//
// 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/Layer.h"
#include "llvm/ExecutionEngine/Orc/DebugUtils.h"
#include "llvm/ExecutionEngine/Orc/ExecutionUtils.h"
#include "llvm/IR/Constants.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "orc"
namespace llvm {
namespace orc {
IRLayer::~IRLayer() {}
Error IRLayer::add(ResourceTrackerSP RT, ThreadSafeModule TSM) {
assert(RT && "RT can not be null");
auto &JD = RT->getJITDylib();
return JD.define(std::make_unique<BasicIRLayerMaterializationUnit>(
*this, *getManglingOptions(), std::move(TSM)),
std::move(RT));
}
IRMaterializationUnit::IRMaterializationUnit(
ExecutionSession &ES, const IRSymbolMapper::ManglingOptions &MO,
ThreadSafeModule TSM)
: MaterializationUnit(SymbolFlagsMap(), nullptr), TSM(std::move(TSM)) {
assert(this->TSM && "Module must not be null");
MangleAndInterner Mangle(ES, this->TSM.getModuleUnlocked()->getDataLayout());
this->TSM.withModuleDo([&](Module &M) {
for (auto &G : M.global_values()) {
// Skip globals that don't generate symbols.
if (!G.hasName() || G.isDeclaration() || G.hasLocalLinkage() ||
G.hasAvailableExternallyLinkage() || G.hasAppendingLinkage())
continue;
// thread locals generate different symbols depending on whether or not
// emulated TLS is enabled.
if (G.isThreadLocal() && MO.EmulatedTLS) {
auto &GV = cast<GlobalVariable>(G);
auto Flags = JITSymbolFlags::fromGlobalValue(GV);
auto EmuTLSV = Mangle(("__emutls_v." + GV.getName()).str());
SymbolFlags[EmuTLSV] = Flags;
SymbolToDefinition[EmuTLSV] = &GV;
// If this GV has a non-zero initializer we'll need to emit an
// __emutls.t symbol too.
if (GV.hasInitializer()) {
const auto *InitVal = GV.getInitializer();
// Skip zero-initializers.
if (isa<ConstantAggregateZero>(InitVal))
continue;
const auto *InitIntValue = dyn_cast<ConstantInt>(InitVal);
if (InitIntValue && InitIntValue->isZero())
continue;
auto EmuTLST = Mangle(("__emutls_t." + GV.getName()).str());
SymbolFlags[EmuTLST] = Flags;
}
continue;
}
// Otherwise we just need a normal linker mangling.
auto MangledName = Mangle(G.getName());
SymbolFlags[MangledName] = JITSymbolFlags::fromGlobalValue(G);
SymbolToDefinition[MangledName] = &G;
}
// If we need an init symbol for this module then create one.
if (!llvm::empty(getStaticInitGVs(M))) {
size_t Counter = 0;
do {
std::string InitSymbolName;
raw_string_ostream(InitSymbolName)
<< "$." << M.getModuleIdentifier() << ".__inits." << Counter++;
InitSymbol = ES.intern(InitSymbolName);
} while (SymbolFlags.count(InitSymbol));
SymbolFlags[InitSymbol] = JITSymbolFlags::MaterializationSideEffectsOnly;
}
});
}
IRMaterializationUnit::IRMaterializationUnit(
ThreadSafeModule TSM, SymbolFlagsMap SymbolFlags,
SymbolStringPtr InitSymbol, SymbolNameToDefinitionMap SymbolToDefinition)
: MaterializationUnit(std::move(SymbolFlags), std::move(InitSymbol)),
TSM(std::move(TSM)), SymbolToDefinition(std::move(SymbolToDefinition)) {}
StringRef IRMaterializationUnit::getName() const {
if (TSM)
return TSM.withModuleDo(
[](const Module &M) -> StringRef { return M.getModuleIdentifier(); });
return "<null module>";
}
void IRMaterializationUnit::discard(const JITDylib &JD,
const SymbolStringPtr &Name) {
LLVM_DEBUG(JD.getExecutionSession().runSessionLocked([&]() {
dbgs() << "In " << JD.getName() << " discarding " << *Name << " from MU@"
<< this << " (" << getName() << ")\n";
}););
auto I = SymbolToDefinition.find(Name);
assert(I != SymbolToDefinition.end() &&
"Symbol not provided by this MU, or previously discarded");
assert(!I->second->isDeclaration() &&
"Discard should only apply to definitions");
I->second->setLinkage(GlobalValue::AvailableExternallyLinkage);
SymbolToDefinition.erase(I);
}
BasicIRLayerMaterializationUnit::BasicIRLayerMaterializationUnit(
IRLayer &L, const IRSymbolMapper::ManglingOptions &MO, ThreadSafeModule TSM)
: IRMaterializationUnit(L.getExecutionSession(), MO, std::move(TSM)), L(L) {
}
void BasicIRLayerMaterializationUnit::materialize(
std::unique_ptr<MaterializationResponsibility> R) {
// Throw away the SymbolToDefinition map: it's not usable after we hand
// off the module.
SymbolToDefinition.clear();
// If cloneToNewContextOnEmit is set, clone the module now.
if (L.getCloneToNewContextOnEmit())
TSM = cloneToNewContext(TSM);
#ifndef NDEBUG
auto &ES = R->getTargetJITDylib().getExecutionSession();
auto &N = R->getTargetJITDylib().getName();
#endif // NDEBUG
LLVM_DEBUG(ES.runSessionLocked(
[&]() { dbgs() << "Emitting, for " << N << ", " << *this << "\n"; }););
L.emit(std::move(R), std::move(TSM));
LLVM_DEBUG(ES.runSessionLocked([&]() {
dbgs() << "Finished emitting, for " << N << ", " << *this << "\n";
}););
}
ObjectLayer::ObjectLayer(ExecutionSession &ES) : ES(ES) {}
ObjectLayer::~ObjectLayer() {}
Error ObjectLayer::add(ResourceTrackerSP RT, std::unique_ptr<MemoryBuffer> O) {
assert(RT && "RT can not be null");
auto ObjMU = BasicObjectLayerMaterializationUnit::Create(*this, std::move(O));
if (!ObjMU)
return ObjMU.takeError();
auto &JD = RT->getJITDylib();
return JD.define(std::move(*ObjMU), std::move(RT));
}
Expected<std::unique_ptr<BasicObjectLayerMaterializationUnit>>
BasicObjectLayerMaterializationUnit::Create(ObjectLayer &L,
std::unique_ptr<MemoryBuffer> O) {
auto ObjSymInfo =
getObjectSymbolInfo(L.getExecutionSession(), O->getMemBufferRef());
if (!ObjSymInfo)
return ObjSymInfo.takeError();
auto &SymbolFlags = ObjSymInfo->first;
auto &InitSymbol = ObjSymInfo->second;
return std::unique_ptr<BasicObjectLayerMaterializationUnit>(
new BasicObjectLayerMaterializationUnit(
L, std::move(O), std::move(SymbolFlags), std::move(InitSymbol)));
}
BasicObjectLayerMaterializationUnit::BasicObjectLayerMaterializationUnit(
ObjectLayer &L, std::unique_ptr<MemoryBuffer> O, SymbolFlagsMap SymbolFlags,
SymbolStringPtr InitSymbol)
: MaterializationUnit(std::move(SymbolFlags), std::move(InitSymbol)), L(L),
O(std::move(O)) {}
StringRef BasicObjectLayerMaterializationUnit::getName() const {
if (O)
return O->getBufferIdentifier();
return "<null object>";
}
void BasicObjectLayerMaterializationUnit::materialize(
std::unique_ptr<MaterializationResponsibility> R) {
L.emit(std::move(R), std::move(O));
}
void BasicObjectLayerMaterializationUnit::discard(const JITDylib &JD,
const SymbolStringPtr &Name) {
// This is a no-op for object files: Having removed 'Name' from SymbolFlags
// the symbol will be dead-stripped by the JIT linker.
}
} // End namespace orc.
} // End namespace llvm.
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