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//===-------------------- Layer.cpp - Layer interfaces --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/Orc/Layer.h"
#include "llvm/Object/ObjectFile.h"
namespace llvm {
namespace orc {
IRLayer::IRLayer(ExecutionSession &ES) : ES(ES) {}
IRLayer::~IRLayer() {}
Error IRLayer::add(JITDylib &JD, VModuleKey K, std::unique_ptr<Module> M) {
return JD.define(llvm::make_unique<BasicIRLayerMaterializationUnit>(
*this, std::move(K), std::move(M)));
}
IRMaterializationUnit::IRMaterializationUnit(ExecutionSession &ES,
std::unique_ptr<Module> M)
: MaterializationUnit(SymbolFlagsMap()), M(std::move(M)) {
MangleAndInterner Mangle(ES, this->M->getDataLayout());
for (auto &G : this->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(
std::unique_ptr<Module> M, SymbolFlagsMap SymbolFlags,
SymbolNameToDefinitionMap SymbolToDefinition)
: MaterializationUnit(std::move(SymbolFlags)), M(std::move(M)),
SymbolToDefinition(std::move(SymbolToDefinition)) {}
void IRMaterializationUnit::discard(const JITDylib &JD, SymbolStringPtr Name) {
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, std::unique_ptr<Module> M)
: IRMaterializationUnit(L.getExecutionSession(), std::move(M)),
L(L), K(std::move(K)) {}
void BasicIRLayerMaterializationUnit::materialize(
MaterializationResponsibility R) {
L.emit(std::move(R), std::move(K), std::move(M));
}
ObjectLayer::ObjectLayer(ExecutionSession &ES) : ES(ES) {}
ObjectLayer::~ObjectLayer() {}
Error ObjectLayer::add(JITDylib &JD, VModuleKey K,
std::unique_ptr<MemoryBuffer> O) {
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)), L(L), K(std::move(K)),
O(std::move(O)) {}
void BasicObjectLayerMaterializationUnit::materialize(
MaterializationResponsibility R) {
L.emit(std::move(R), std::move(K), std::move(O));
}
void BasicObjectLayerMaterializationUnit::discard(const JITDylib &JD,
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()) {
if (!(Sym.getFlags() & object::BasicSymbolRef::SF_Undefined) &&
(Sym.getFlags() & object::BasicSymbolRef::SF_Exported)) {
auto Name = Sym.getName();
if (!Name)
return Name.takeError();
auto InternedName = ES.getSymbolStringPool().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.
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