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//===---------- LazyReexports.cpp - Utilities for lazy reexports ----------===//
//
// 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/LazyObjectLinkingLayer.h"
#include "llvm/ExecutionEngine/Orc/LazyReexports.h"
#include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h"
#include "llvm/ExecutionEngine/Orc/RedirectionManager.h"
using namespace llvm;
using namespace llvm::jitlink;
namespace {
constexpr StringRef FnBodySuffix = "$orc_fnbody";
} // anonymous namespace
namespace llvm::orc {
class LazyObjectLinkingLayer::RenamerPlugin
: public ObjectLinkingLayer::Plugin {
public:
void modifyPassConfig(MaterializationResponsibility &MR,
jitlink::LinkGraph &LG,
jitlink::PassConfiguration &Config) override {
// We need to insert this before the mark-live pass to ensure that we don't
// delete the bodies (their names won't match the responsibility set until
// after this pass completes.
Config.PrePrunePasses.insert(
Config.PrePrunePasses.begin(),
[&MR](LinkGraph &G) { return renameFunctionBodies(G, MR); });
}
Error notifyFailed(MaterializationResponsibility &MR) override {
return Error::success();
}
Error notifyRemovingResources(JITDylib &JD, ResourceKey K) override {
return Error::success();
}
void notifyTransferringResources(JITDylib &JD, ResourceKey DstKey,
ResourceKey SrcKey) override {}
private:
static Error renameFunctionBodies(LinkGraph &G,
MaterializationResponsibility &MR) {
DenseMap<StringRef, NonOwningSymbolStringPtr> SymsToRename;
for (auto &[Name, Flags] : MR.getSymbols())
if ((*Name).ends_with(FnBodySuffix))
SymsToRename[(*Name).drop_back(FnBodySuffix.size())] =
NonOwningSymbolStringPtr(Name);
for (auto *Sym : G.defined_symbols()) {
if (!Sym->hasName())
continue;
auto I = SymsToRename.find(*Sym->getName());
if (I == SymsToRename.end())
continue;
Sym->setName(G.intern(G.allocateName(*I->second)));
}
return Error::success();
}
};
LazyObjectLinkingLayer::LazyObjectLinkingLayer(ObjectLinkingLayer &BaseLayer,
LazyReexportsManager &LRMgr)
: ObjectLayer(BaseLayer.getExecutionSession()), BaseLayer(BaseLayer),
LRMgr(LRMgr) {
BaseLayer.addPlugin(std::make_unique<RenamerPlugin>());
}
Error LazyObjectLinkingLayer::add(ResourceTrackerSP RT,
std::unique_ptr<MemoryBuffer> O,
MaterializationUnit::Interface I) {
// Object files with initializer symbols can't be lazy.
if (I.InitSymbol)
return BaseLayer.add(std::move(RT), std::move(O), std::move(I));
auto &ES = getExecutionSession();
SymbolAliasMap LazySymbols;
for (auto &[Name, Flags] : I.SymbolFlags)
if (Flags.isCallable())
LazySymbols[Name] = {ES.intern((*Name + FnBodySuffix).str()), Flags};
for (auto &[Name, AI] : LazySymbols) {
I.SymbolFlags.erase(Name);
I.SymbolFlags[AI.Aliasee] = AI.AliasFlags;
}
if (auto Err = BaseLayer.add(RT, std::move(O), std::move(I)))
return Err;
auto &JD = RT->getJITDylib();
return JD.define(lazyReexports(LRMgr, std::move(LazySymbols)), std::move(RT));
}
void LazyObjectLinkingLayer::emit(
std::unique_ptr<MaterializationResponsibility> MR,
std::unique_ptr<MemoryBuffer> Obj) {
return BaseLayer.emit(std::move(MR), std::move(Obj));
}
} // namespace llvm::orc
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