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llvm-project/llvm/lib/ExecutionEngine/Orc/IndirectionUtils.cpp
Lang Hames bf6603e918 [ORC] Promote and rename private symbols inside the CompileOnDemand layer, 
rather than require them to have been promoted before being passed in.

Dropping this precondition is better for layer composition (CompileOnDemandLayer
was the only one that placed pre-conditions on the modules that could be added).
It also means that the promoted private symbols do not show up in the target
JITDylib's symbol table. Instead, they are confined to the hidden implementation
dylib that contains the actual definitions.

For the 403.gcc testcase this cut down the public symbol table size from ~15,000
symbols to ~4000, substantially reducing symbol dependence tracking costs.

llvm-svn: 344078
2018-10-09 20:44:32 +00:00

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//===---- IndirectionUtils.cpp - Utilities for call indirection in Orc ----===//
//
// 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/IndirectionUtils.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ExecutionEngine/Orc/OrcABISupport.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/Support/Format.h"
#include "llvm/Transforms/Utils/Cloning.h"
#include <sstream>
using namespace llvm;
using namespace llvm::orc;
namespace {
class CompileCallbackMaterializationUnit : public orc::MaterializationUnit {
public:
using CompileFunction = JITCompileCallbackManager::CompileFunction;
CompileCallbackMaterializationUnit(SymbolStringPtr Name,
CompileFunction Compile)
: MaterializationUnit(SymbolFlagsMap({{Name, JITSymbolFlags::Exported}})),
Name(std::move(Name)), Compile(std::move(Compile)) {}
StringRef getName() const override { return "<Compile Callbacks>"; }
private:
void materialize(MaterializationResponsibility R) override {
SymbolMap Result;
Result[Name] = JITEvaluatedSymbol(Compile(), JITSymbolFlags::Exported);
R.resolve(Result);
R.emit();
}
void discard(const JITDylib &JD, const SymbolStringPtr &Name) override {
llvm_unreachable("Discard should never occur on a LMU?");
}
SymbolStringPtr Name;
CompileFunction Compile;
};
} // namespace
namespace llvm {
namespace orc {
void IndirectStubsManager::anchor() {}
void TrampolinePool::anchor() {}
Expected<JITTargetAddress>
JITCompileCallbackManager::getCompileCallback(CompileFunction Compile) {
if (auto TrampolineAddr = TP->getTrampoline()) {
auto CallbackName =
ES.intern(std::string("cc") + std::to_string(++NextCallbackId));
std::lock_guard<std::mutex> Lock(CCMgrMutex);
AddrToSymbol[*TrampolineAddr] = CallbackName;
cantFail(CallbacksJD.define(
llvm::make_unique<CompileCallbackMaterializationUnit>(
std::move(CallbackName), std::move(Compile))));
return *TrampolineAddr;
} else
return TrampolineAddr.takeError();
}
JITTargetAddress JITCompileCallbackManager::executeCompileCallback(
JITTargetAddress TrampolineAddr) {
SymbolStringPtr Name;
{
std::unique_lock<std::mutex> Lock(CCMgrMutex);
auto I = AddrToSymbol.find(TrampolineAddr);
// If this address is not associated with a compile callback then report an
// error to the execution session and return ErrorHandlerAddress to the
// callee.
if (I == AddrToSymbol.end()) {
Lock.unlock();
std::string ErrMsg;
{
raw_string_ostream ErrMsgStream(ErrMsg);
ErrMsgStream << "No compile callback for trampoline at "
<< format("0x%016x", TrampolineAddr);
}
ES.reportError(
make_error<StringError>(std::move(ErrMsg), inconvertibleErrorCode()));
return ErrorHandlerAddress;
} else
Name = I->second;
}
if (auto Sym = lookup({&CallbacksJD}, Name))
return Sym->getAddress();
else {
// If anything goes wrong materializing Sym then report it to the session
// and return the ErrorHandlerAddress;
ES.reportError(Sym.takeError());
return ErrorHandlerAddress;
}
}
Expected<std::unique_ptr<JITCompileCallbackManager>>
createLocalCompileCallbackManager(const Triple &T, ExecutionSession &ES,
JITTargetAddress ErrorHandlerAddress) {
switch (T.getArch()) {
default:
return make_error<StringError>(
std::string("No callback manager available for ") + T.str(),
inconvertibleErrorCode());
case Triple::aarch64: {
typedef orc::LocalJITCompileCallbackManager<orc::OrcAArch64> CCMgrT;
return CCMgrT::Create(ES, ErrorHandlerAddress);
}
case Triple::x86: {
typedef orc::LocalJITCompileCallbackManager<orc::OrcI386> CCMgrT;
return CCMgrT::Create(ES, ErrorHandlerAddress);
}
case Triple::mips: {
typedef orc::LocalJITCompileCallbackManager<orc::OrcMips32Be> CCMgrT;
return CCMgrT::Create(ES, ErrorHandlerAddress);
}
case Triple::mipsel: {
typedef orc::LocalJITCompileCallbackManager<orc::OrcMips32Le> CCMgrT;
return CCMgrT::Create(ES, ErrorHandlerAddress);
}
case Triple::mips64:
case Triple::mips64el: {
typedef orc::LocalJITCompileCallbackManager<orc::OrcMips64> CCMgrT;
return CCMgrT::Create(ES, ErrorHandlerAddress);
}
case Triple::x86_64: {
if ( T.getOS() == Triple::OSType::Win32 ) {
typedef orc::LocalJITCompileCallbackManager<orc::OrcX86_64_Win32> CCMgrT;
return CCMgrT::Create(ES, ErrorHandlerAddress);
} else {
typedef orc::LocalJITCompileCallbackManager<orc::OrcX86_64_SysV> CCMgrT;
return CCMgrT::Create(ES, ErrorHandlerAddress);
}
}
}
}
std::function<std::unique_ptr<IndirectStubsManager>()>
createLocalIndirectStubsManagerBuilder(const Triple &T) {
switch (T.getArch()) {
default:
return [](){
return llvm::make_unique<
orc::LocalIndirectStubsManager<orc::OrcGenericABI>>();
};
case Triple::aarch64:
return [](){
return llvm::make_unique<
orc::LocalIndirectStubsManager<orc::OrcAArch64>>();
};
case Triple::x86:
return [](){
return llvm::make_unique<
orc::LocalIndirectStubsManager<orc::OrcI386>>();
};
case Triple::mips:
return [](){
return llvm::make_unique<
orc::LocalIndirectStubsManager<orc::OrcMips32Be>>();
};
case Triple::mipsel:
return [](){
return llvm::make_unique<
orc::LocalIndirectStubsManager<orc::OrcMips32Le>>();
};
case Triple::mips64:
case Triple::mips64el:
return [](){
return llvm::make_unique<
orc::LocalIndirectStubsManager<orc::OrcMips64>>();
};
case Triple::x86_64:
if (T.getOS() == Triple::OSType::Win32) {
return [](){
return llvm::make_unique<
orc::LocalIndirectStubsManager<orc::OrcX86_64_Win32>>();
};
} else {
return [](){
return llvm::make_unique<
orc::LocalIndirectStubsManager<orc::OrcX86_64_SysV>>();
};
}
}
}
Constant* createIRTypedAddress(FunctionType &FT, JITTargetAddress Addr) {
Constant *AddrIntVal =
ConstantInt::get(Type::getInt64Ty(FT.getContext()), Addr);
Constant *AddrPtrVal =
ConstantExpr::getCast(Instruction::IntToPtr, AddrIntVal,
PointerType::get(&FT, 0));
return AddrPtrVal;
}
GlobalVariable* createImplPointer(PointerType &PT, Module &M,
const Twine &Name, Constant *Initializer) {
auto IP = new GlobalVariable(M, &PT, false, GlobalValue::ExternalLinkage,
Initializer, Name, nullptr,
GlobalValue::NotThreadLocal, 0, true);
IP->setVisibility(GlobalValue::HiddenVisibility);
return IP;
}
void makeStub(Function &F, Value &ImplPointer) {
assert(F.isDeclaration() && "Can't turn a definition into a stub.");
assert(F.getParent() && "Function isn't in a module.");
Module &M = *F.getParent();
BasicBlock *EntryBlock = BasicBlock::Create(M.getContext(), "entry", &F);
IRBuilder<> Builder(EntryBlock);
LoadInst *ImplAddr = Builder.CreateLoad(&ImplPointer);
std::vector<Value*> CallArgs;
for (auto &A : F.args())
CallArgs.push_back(&A);
CallInst *Call = Builder.CreateCall(ImplAddr, CallArgs);
Call->setTailCall();
Call->setAttributes(F.getAttributes());
if (F.getReturnType()->isVoidTy())
Builder.CreateRetVoid();
else
Builder.CreateRet(Call);
}
std::vector<GlobalValue *> SymbolLinkagePromoter::operator()(Module &M) {
std::vector<GlobalValue *> PromotedGlobals;
for (auto &GV : M.global_values()) {
bool Promoted = true;
// Rename if necessary.
if (!GV.hasName())
GV.setName("__orc_anon." + Twine(NextId++));
else if (GV.getName().startswith("\01L"))
GV.setName("__" + GV.getName().substr(1) + "." + Twine(NextId++));
else if (GV.hasLocalLinkage())
GV.setName("__orc_lcl." + GV.getName() + "." + Twine(NextId++));
else
Promoted = false;
if (GV.hasLocalLinkage()) {
GV.setLinkage(GlobalValue::ExternalLinkage);
GV.setVisibility(GlobalValue::HiddenVisibility);
Promoted = true;
}
GV.setUnnamedAddr(GlobalValue::UnnamedAddr::None);
if (Promoted)
PromotedGlobals.push_back(&GV);
}
return PromotedGlobals;
}
Function* cloneFunctionDecl(Module &Dst, const Function &F,
ValueToValueMapTy *VMap) {
Function *NewF =
Function::Create(cast<FunctionType>(F.getValueType()),
F.getLinkage(), F.getName(), &Dst);
NewF->copyAttributesFrom(&F);
if (VMap) {
(*VMap)[&F] = NewF;
auto NewArgI = NewF->arg_begin();
for (auto ArgI = F.arg_begin(), ArgE = F.arg_end(); ArgI != ArgE;
++ArgI, ++NewArgI)
(*VMap)[&*ArgI] = &*NewArgI;
}
return NewF;
}
void moveFunctionBody(Function &OrigF, ValueToValueMapTy &VMap,
ValueMaterializer *Materializer,
Function *NewF) {
assert(!OrigF.isDeclaration() && "Nothing to move");
if (!NewF)
NewF = cast<Function>(VMap[&OrigF]);
else
assert(VMap[&OrigF] == NewF && "Incorrect function mapping in VMap.");
assert(NewF && "Function mapping missing from VMap.");
assert(NewF->getParent() != OrigF.getParent() &&
"moveFunctionBody should only be used to move bodies between "
"modules.");
SmallVector<ReturnInst *, 8> Returns; // Ignore returns cloned.
CloneFunctionInto(NewF, &OrigF, VMap, /*ModuleLevelChanges=*/true, Returns,
"", nullptr, nullptr, Materializer);
OrigF.deleteBody();
}
GlobalVariable* cloneGlobalVariableDecl(Module &Dst, const GlobalVariable &GV,
ValueToValueMapTy *VMap) {
GlobalVariable *NewGV = new GlobalVariable(
Dst, GV.getValueType(), GV.isConstant(),
GV.getLinkage(), nullptr, GV.getName(), nullptr,
GV.getThreadLocalMode(), GV.getType()->getAddressSpace());
NewGV->copyAttributesFrom(&GV);
if (VMap)
(*VMap)[&GV] = NewGV;
return NewGV;
}
void moveGlobalVariableInitializer(GlobalVariable &OrigGV,
ValueToValueMapTy &VMap,
ValueMaterializer *Materializer,
GlobalVariable *NewGV) {
assert(OrigGV.hasInitializer() && "Nothing to move");
if (!NewGV)
NewGV = cast<GlobalVariable>(VMap[&OrigGV]);
else
assert(VMap[&OrigGV] == NewGV &&
"Incorrect global variable mapping in VMap.");
assert(NewGV->getParent() != OrigGV.getParent() &&
"moveGlobalVariableInitializer should only be used to move "
"initializers between modules");
NewGV->setInitializer(MapValue(OrigGV.getInitializer(), VMap, RF_None,
nullptr, Materializer));
}
GlobalAlias* cloneGlobalAliasDecl(Module &Dst, const GlobalAlias &OrigA,
ValueToValueMapTy &VMap) {
assert(OrigA.getAliasee() && "Original alias doesn't have an aliasee?");
auto *NewA = GlobalAlias::create(OrigA.getValueType(),
OrigA.getType()->getPointerAddressSpace(),
OrigA.getLinkage(), OrigA.getName(), &Dst);
NewA->copyAttributesFrom(&OrigA);
VMap[&OrigA] = NewA;
return NewA;
}
void cloneModuleFlagsMetadata(Module &Dst, const Module &Src,
ValueToValueMapTy &VMap) {
auto *MFs = Src.getModuleFlagsMetadata();
if (!MFs)
return;
for (auto *MF : MFs->operands())
Dst.addModuleFlag(MapMetadata(MF, VMap));
}
} // End namespace orc.
} // End namespace llvm.
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