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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/IndirectionUtils.h"
#include "llvm/IR/CallSite.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/Transforms/Utils/Cloning.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) {
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, 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();
Call->setAttributes(F.getAttributes());
if (F.getReturnType()->isVoidTy())
Builder.CreateRetVoid();
else
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;
};
static void raiseVisibilityOnValue(GlobalValue &V, GlobalRenamer &R) {
if (V.hasLocalLinkage()) {
if (R.needsRenaming(V))
V.setName(R.getRename(V));
V.setLinkage(GlobalValue::ExternalLinkage);
V.setVisibility(GlobalValue::HiddenVisibility);
}
V.setUnnamedAddr(false);
assert(!R.needsRenaming(V) && "Invalid global name.");
}
void makeAllSymbolsExternallyAccessible(Module &M) {
GlobalRenamer Renamer;
for (auto &F : M)
raiseVisibilityOnValue(F, Renamer);
for (auto &GV : M.globals())
raiseVisibilityOnValue(GV, Renamer);
}
Function* cloneFunctionDecl(Module &Dst, const Function &F,
ValueToValueMapTy *VMap) {
assert(F.getParent() != &Dst && "Can't copy decl over existing function.");
Function *NewF =
Function::Create(cast<FunctionType>(F.getType()->getElementType()),
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) {
assert(GV.getParent() != &Dst && "Can't copy decl over existing global var.");
GlobalVariable *NewGV = new GlobalVariable(
Dst, GV.getType()->getElementType(), 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() &&
"moveGlobalVariable should only be used to move initializers between "
"modules");
NewGV->setInitializer(MapValue(OrigGV.getInitializer(), VMap, RF_None,
nullptr, Materializer));
}
} // End namespace orc.
} // End namespace llvm.
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