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//===----- LinkGraphLayer.cpp - Add LinkGraphs to an ExecutionSession -----===//
//
// 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/LinkGraphLayer.h"
#include "llvm/ExecutionEngine/JITLink/JITLink.h"
#include "llvm/ExecutionEngine/Orc/Shared/MachOObjectFormat.h"
#include "llvm/ExecutionEngine/Orc/Shared/ObjectFormats.h"
#define DEBUG_TYPE "orc"
using namespace llvm;
using namespace llvm::jitlink;
using namespace llvm::orc;
namespace {
bool hasInitializerSection(LinkGraph &G) {
bool IsMachO = G.getTargetTriple().isOSBinFormatMachO();
bool IsElf = G.getTargetTriple().isOSBinFormatELF();
if (!IsMachO && !IsElf)
return false;
for (auto &Sec : G.sections()) {
if (IsMachO && isMachOInitializerSection(Sec.getName()))
return true;
if (IsElf && isELFInitializerSection(Sec.getName()))
return true;
}
return false;
}
} // end anonymous namespace
namespace llvm::orc {
LinkGraphLayer::~LinkGraphLayer() = default;
MaterializationUnit::Interface LinkGraphLayer::getInterface(LinkGraph &G) {
MaterializationUnit::Interface LGI;
auto AddSymbol = [&](Symbol *Sym) {
// Skip local symbols.
if (Sym->getScope() == Scope::Local)
return;
assert(Sym->hasName() && "Anonymous non-local symbol?");
LGI.SymbolFlags[Sym->getName()] = getJITSymbolFlagsForSymbol(*Sym);
};
for (auto *Sym : G.defined_symbols())
AddSymbol(Sym);
for (auto *Sym : G.absolute_symbols())
AddSymbol(Sym);
if (hasInitializerSection(G)) {
std::string InitSymString;
{
raw_string_ostream(InitSymString)
<< "$." << G.getName() << ".__inits" << Counter++;
}
LGI.InitSymbol = ES.intern(InitSymString);
}
return LGI;
}
JITSymbolFlags LinkGraphLayer::getJITSymbolFlagsForSymbol(Symbol &Sym) {
JITSymbolFlags Flags;
if (Sym.getLinkage() == Linkage::Weak)
Flags |= JITSymbolFlags::Weak;
if (Sym.getScope() == Scope::Default)
Flags |= JITSymbolFlags::Exported;
else if (Sym.getScope() == Scope::SideEffectsOnly)
Flags |= JITSymbolFlags::MaterializationSideEffectsOnly;
if (Sym.isCallable())
Flags |= JITSymbolFlags::Callable;
return Flags;
}
StringRef LinkGraphMaterializationUnit::getName() const { return G->getName(); }
void LinkGraphMaterializationUnit::discard(const JITDylib &JD,
const SymbolStringPtr &Name) {
for (auto *Sym : G->defined_symbols())
if (Sym->getName() == Name) {
assert(Sym->getLinkage() == Linkage::Weak &&
"Discarding non-weak definition");
G->makeExternal(*Sym);
break;
}
}
} // namespace llvm::orc
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