1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183
|
//===-------------------- 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(llvm::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.getModule()->getDataLayout());
for (auto &G : this->TSM.getModule()->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.getModule())
return TSM.getModule()->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
auto Lock = TSM.getContextLock();
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.
|