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//===-- ObjCARC.cpp -------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements common infrastructure for libLLVMObjCARCOpts.a, which
// implements several scalar transformations over the LLVM intermediate
// representation, including the C bindings for that library.
//
//===----------------------------------------------------------------------===//
#include "ObjCARC.h"
#include "llvm-c/Initialization.h"
#include "llvm/Analysis/ObjCARCUtil.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Instructions.h"
#include "llvm/InitializePasses.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
namespace llvm {
class PassRegistry;
}
using namespace llvm;
using namespace llvm::objcarc;
/// initializeObjCARCOptsPasses - Initialize all passes linked into the
/// ObjCARCOpts library.
void llvm::initializeObjCARCOpts(PassRegistry &Registry) {
initializeObjCARCAAWrapperPassPass(Registry);
initializeObjCARCAPElimPass(Registry);
initializeObjCARCExpandPass(Registry);
initializeObjCARCContractLegacyPassPass(Registry);
initializeObjCARCOptLegacyPassPass(Registry);
initializePAEvalPass(Registry);
}
void LLVMInitializeObjCARCOpts(LLVMPassRegistryRef R) {
initializeObjCARCOpts(*unwrap(R));
}
CallInst *objcarc::createCallInstWithColors(
FunctionCallee Func, ArrayRef<Value *> Args, const Twine &NameStr,
Instruction *InsertBefore,
const DenseMap<BasicBlock *, ColorVector> &BlockColors) {
FunctionType *FTy = Func.getFunctionType();
Value *Callee = Func.getCallee();
SmallVector<OperandBundleDef, 1> OpBundles;
if (!BlockColors.empty()) {
const ColorVector &CV = BlockColors.find(InsertBefore->getParent())->second;
assert(CV.size() == 1 && "non-unique color for block!");
Instruction *EHPad = CV.front()->getFirstNonPHI();
if (EHPad->isEHPad())
OpBundles.emplace_back("funclet", EHPad);
}
return CallInst::Create(FTy, Callee, Args, OpBundles, NameStr, InsertBefore);
}
std::pair<bool, bool>
BundledRetainClaimRVs::insertAfterInvokes(Function &F, DominatorTree *DT) {
bool Changed = false, CFGChanged = false;
for (BasicBlock &BB : F) {
auto *I = dyn_cast<InvokeInst>(BB.getTerminator());
if (!I)
continue;
if (!objcarc::hasAttachedCallOpBundle(I))
continue;
BasicBlock *DestBB = I->getNormalDest();
if (!DestBB->getSinglePredecessor()) {
assert(I->getSuccessor(0) == DestBB &&
"the normal dest is expected to be the first successor");
DestBB = SplitCriticalEdge(I, 0, CriticalEdgeSplittingOptions(DT));
CFGChanged = true;
}
// We don't have to call insertRVCallWithColors since DestBB is the normal
// destination of the invoke.
insertRVCall(&*DestBB->getFirstInsertionPt(), I);
Changed = true;
}
return std::make_pair(Changed, CFGChanged);
}
CallInst *BundledRetainClaimRVs::insertRVCall(Instruction *InsertPt,
CallBase *AnnotatedCall) {
DenseMap<BasicBlock *, ColorVector> BlockColors;
return insertRVCallWithColors(InsertPt, AnnotatedCall, BlockColors);
}
CallInst *BundledRetainClaimRVs::insertRVCallWithColors(
Instruction *InsertPt, CallBase *AnnotatedCall,
const DenseMap<BasicBlock *, ColorVector> &BlockColors) {
IRBuilder<> Builder(InsertPt);
bool IsRetainRV = objcarc::hasAttachedCallOpBundle(AnnotatedCall, true);
Function *Func = EP.get(IsRetainRV ? ARCRuntimeEntryPointKind::RetainRV
: ARCRuntimeEntryPointKind::ClaimRV);
Type *ParamTy = Func->getArg(0)->getType();
Value *CallArg = Builder.CreateBitCast(AnnotatedCall, ParamTy);
auto *Call =
createCallInstWithColors(Func, CallArg, "", InsertPt, BlockColors);
RVCalls[Call] = AnnotatedCall;
return Call;
}
BundledRetainClaimRVs::~BundledRetainClaimRVs() {
if (ContractPass) {
// At this point, we know that the annotated calls can't be tail calls as
// they are followed by marker instructions and retainRV/claimRV calls. Mark
// them as notail, so that the backend knows these calls can't be tail
// calls.
for (auto P : RVCalls)
if (auto *CI = dyn_cast<CallInst>(P.second))
CI->setTailCallKind(CallInst::TCK_NoTail);
} else {
for (auto P : RVCalls)
EraseInstruction(P.first);
}
RVCalls.clear();
}
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