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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/Object/ObjectFile.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "orc"
namespace llvm {
namespace orc {
IRLayer::IRLayer(ExecutionSession &ES) : ES(ES) {}
IRLayer::~IRLayer() {}
Error IRLayer::add(JITDylib &JD, ThreadSafeModule TSM, VModuleKey K) {
return JD.define(std::make_unique<BasicIRLayerMaterializationUnit>(
*this, std::move(K), std::move(TSM)));
}
IRMaterializationUnit::IRMaterializationUnit(ExecutionSession &ES,
ThreadSafeModule TSM, VModuleKey K)
: MaterializationUnit(SymbolFlagsMap(), std::move(K)), 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()) {
if (G.hasName() && !G.isDeclaration() && !G.hasLocalLinkage() &&
!G.hasAvailableExternallyLinkage() && !G.hasAppendingLinkage()) {
auto MangledName = Mangle(G.getName());
SymbolFlags[MangledName] = JITSymbolFlags::fromGlobalValue(G);
SymbolToDefinition[MangledName] = &G;
}
}
});
}
IRMaterializationUnit::IRMaterializationUnit(
ThreadSafeModule TSM, VModuleKey K, SymbolFlagsMap SymbolFlags,
SymbolNameToDefinitionMap SymbolToDefinition)
: MaterializationUnit(std::move(SymbolFlags), std::move(K)),
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, VModuleKey K, ThreadSafeModule TSM)
: IRMaterializationUnit(L.getExecutionSession(), std::move(TSM),
std::move(K)),
L(L), K(std::move(K)) {}
void BasicIRLayerMaterializationUnit::materialize(
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(JITDylib &JD, std::unique_ptr<MemoryBuffer> O,
VModuleKey K) {
auto ObjMU = BasicObjectLayerMaterializationUnit::Create(*this, std::move(K),
std::move(O));
if (!ObjMU)
return ObjMU.takeError();
return JD.define(std::move(*ObjMU));
}
Expected<std::unique_ptr<BasicObjectLayerMaterializationUnit>>
BasicObjectLayerMaterializationUnit::Create(ObjectLayer &L, VModuleKey K,
std::unique_ptr<MemoryBuffer> O) {
auto SymbolFlags =
getObjectSymbolFlags(L.getExecutionSession(), O->getMemBufferRef());
if (!SymbolFlags)
return SymbolFlags.takeError();
return std::unique_ptr<BasicObjectLayerMaterializationUnit>(
new BasicObjectLayerMaterializationUnit(L, K, std::move(O),
std::move(*SymbolFlags)));
}
BasicObjectLayerMaterializationUnit::BasicObjectLayerMaterializationUnit(
ObjectLayer &L, VModuleKey K, std::unique_ptr<MemoryBuffer> O,
SymbolFlagsMap SymbolFlags)
: MaterializationUnit(std::move(SymbolFlags), std::move(K)), L(L),
O(std::move(O)) {}
StringRef BasicObjectLayerMaterializationUnit::getName() const {
if (O)
return O->getBufferIdentifier();
return "<null object>";
}
void BasicObjectLayerMaterializationUnit::materialize(
MaterializationResponsibility R) {
L.emit(std::move(R), std::move(O));
}
void BasicObjectLayerMaterializationUnit::discard(const JITDylib &JD,
const SymbolStringPtr &Name) {
// FIXME: Support object file level discard. This could be done by building a
// filter to pass to the object layer along with the object itself.
}
Expected<SymbolFlagsMap> getObjectSymbolFlags(ExecutionSession &ES,
MemoryBufferRef ObjBuffer) {
auto Obj = object::ObjectFile::createObjectFile(ObjBuffer);
if (!Obj)
return Obj.takeError();
SymbolFlagsMap SymbolFlags;
for (auto &Sym : (*Obj)->symbols()) {
// Skip symbols not defined in this object file.
if (Sym.getFlags() & object::BasicSymbolRef::SF_Undefined)
continue;
// Skip symbols that are not global.
if (!(Sym.getFlags() & object::BasicSymbolRef::SF_Global))
continue;
auto Name = Sym.getName();
if (!Name)
return Name.takeError();
auto InternedName = ES.intern(*Name);
auto SymFlags = JITSymbolFlags::fromObjectSymbol(Sym);
if (!SymFlags)
return SymFlags.takeError();
SymbolFlags[InternedName] = std::move(*SymFlags);
}
return SymbolFlags;
}
} // End namespace orc.
} // End namespace llvm.
|