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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/ADT/STLExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ExecutionEngine/Orc/CloneSubModule.h"
#include "llvm/ExecutionEngine/Orc/IndirectionUtils.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/IRBuilder.h"
#include <set>
#include <sstream>
namespace llvm {
namespace orc {
Constant* createIRTypedAddress(FunctionType &FT, TargetAddress 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) {
if (!Initializer)
Initializer = Constant::getNullValue(&PT);
return new GlobalVariable(M, &PT, false, GlobalValue::ExternalLinkage,
Initializer, Name, nullptr,
GlobalValue::NotThreadLocal, 0, true);
}
void makeStub(Function &F, GlobalVariable &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();
Builder.CreateRet(Call);
}
// Utility class for renaming global values and functions during partitioning.
class GlobalRenamer {
public:
static bool needsRenaming(const Value &New) {
if (!New.hasName() || New.getName().startswith("\01L"))
return true;
return false;
}
const std::string& getRename(const Value &Orig) {
// See if we have a name for this global.
{
auto I = Names.find(&Orig);
if (I != Names.end())
return I->second;
}
// Nope. Create a new one.
// FIXME: Use a more robust uniquing scheme. (This may blow up if the user
// writes a "__orc_anon[[:digit:]]* method).
unsigned ID = Names.size();
std::ostringstream NameStream;
NameStream << "__orc_anon" << ID++;
auto I = Names.insert(std::make_pair(&Orig, NameStream.str()));
return I.first->second;
}
private:
DenseMap<const Value*, std::string> Names;
};
void partition(Module &M, const ModulePartitionMap &PMap) {
GlobalRenamer Renamer;
for (auto &KVPair : PMap) {
auto ExtractGlobalVars =
[&](GlobalVariable &New, const GlobalVariable &Orig,
ValueToValueMapTy &VMap) {
if (KVPair.second.count(&Orig)) {
copyGVInitializer(New, Orig, VMap);
}
if (New.hasLocalLinkage()) {
if (Renamer.needsRenaming(New))
New.setName(Renamer.getRename(Orig));
New.setLinkage(GlobalValue::ExternalLinkage);
New.setVisibility(GlobalValue::HiddenVisibility);
}
assert(!Renamer.needsRenaming(New) && "Invalid global name.");
};
auto ExtractFunctions =
[&](Function &New, const Function &Orig, ValueToValueMapTy &VMap) {
if (KVPair.second.count(&Orig))
copyFunctionBody(New, Orig, VMap);
if (New.hasLocalLinkage()) {
if (Renamer.needsRenaming(New))
New.setName(Renamer.getRename(Orig));
New.setLinkage(GlobalValue::ExternalLinkage);
New.setVisibility(GlobalValue::HiddenVisibility);
}
assert(!Renamer.needsRenaming(New) && "Invalid function name.");
};
CloneSubModule(*KVPair.first, M, ExtractGlobalVars, ExtractFunctions,
false);
}
}
FullyPartitionedModule fullyPartition(Module &M) {
FullyPartitionedModule MP;
ModulePartitionMap PMap;
for (auto &F : M) {
if (F.isDeclaration())
continue;
std::string NewModuleName = (M.getName() + "." + F.getName()).str();
MP.Functions.push_back(
llvm::make_unique<Module>(NewModuleName, M.getContext()));
MP.Functions.back()->setDataLayout(M.getDataLayout());
PMap[MP.Functions.back().get()].insert(&F);
}
MP.GlobalVars =
llvm::make_unique<Module>((M.getName() + ".globals_and_stubs").str(),
M.getContext());
MP.GlobalVars->setDataLayout(M.getDataLayout());
MP.Commons =
llvm::make_unique<Module>((M.getName() + ".commons").str(), M.getContext());
MP.Commons->setDataLayout(M.getDataLayout());
// Make sure there's at least an empty set for the stubs map or we'll fail
// to clone anything for it (including the decls).
PMap[MP.GlobalVars.get()] = ModulePartitionMap::mapped_type();
for (auto &GV : M.globals())
if (GV.getLinkage() == GlobalValue::CommonLinkage)
PMap[MP.Commons.get()].insert(&GV);
else
PMap[MP.GlobalVars.get()].insert(&GV);
partition(M, PMap);
return MP;
}
} // End namespace orc.
} // End namespace llvm.
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