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[objc-arc] Updated ObjCARCOpts to use ARCRuntimeEntryPoints.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185741 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Gottesman
parent
7ec67156b0
commit
50951c7f79
@ -26,6 +26,7 @@
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#define DEBUG_TYPE "objc-arc-opts"
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#include "ObjCARC.h"
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#include "ARCRuntimeEntryPoints.h"
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#include "DependencyAnalysis.h"
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#include "ObjCARCAliasAnalysis.h"
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#include "ProvenanceAnalysis.h"
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@ -1127,6 +1128,7 @@ namespace {
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class ObjCARCOpt : public FunctionPass {
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bool Changed;
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ProvenanceAnalysis PA;
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ARCRuntimeEntryPoints EP;
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// This is used to track if a pointer is stored into an alloca.
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DenseSet<const Value *> MultiOwnersSet;
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@ -1134,21 +1136,6 @@ namespace {
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/// A flag indicating whether this optimization pass should run.
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bool Run;
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/// Declarations for ObjC runtime functions, for use in creating calls to
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/// them. These are initialized lazily to avoid cluttering up the Module
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/// with unused declarations.
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/// Declaration for ObjC runtime function objc_autoreleaseReturnValue.
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Constant *AutoreleaseRVCallee;
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/// Declaration for ObjC runtime function objc_release.
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Constant *ReleaseCallee;
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/// Declaration for ObjC runtime function objc_retain.
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Constant *RetainCallee;
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/// Declaration for ObjC runtime function objc_retainBlock.
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Constant *RetainBlockCallee;
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/// Declaration for ObjC runtime function objc_autorelease.
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Constant *AutoreleaseCallee;
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/// Flags which determine whether each of the interesting runtine functions
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/// is in fact used in the current function.
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unsigned UsedInThisFunction;
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@ -1171,12 +1158,6 @@ namespace {
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unsigned ARCAnnotationProvenanceSourceMDKind;
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#endif // ARC_ANNOATIONS
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Constant *getAutoreleaseRVCallee(Module *M);
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Constant *getReleaseCallee(Module *M);
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Constant *getRetainCallee(Module *M);
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Constant *getRetainBlockCallee(Module *M);
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Constant *getAutoreleaseCallee(Module *M);
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bool IsRetainBlockOptimizable(const Instruction *Inst);
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bool OptimizeRetainRVCall(Function &F, Instruction *RetainRV);
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@ -1288,85 +1269,6 @@ bool ObjCARCOpt::IsRetainBlockOptimizable(const Instruction *Inst) {
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return true;
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}
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Constant *ObjCARCOpt::getAutoreleaseRVCallee(Module *M) {
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if (!AutoreleaseRVCallee) {
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LLVMContext &C = M->getContext();
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Type *I8X = PointerType::getUnqual(Type::getInt8Ty(C));
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Type *Params[] = { I8X };
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FunctionType *FTy = FunctionType::get(I8X, Params, /*isVarArg=*/false);
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AttributeSet Attribute =
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AttributeSet().addAttribute(M->getContext(), AttributeSet::FunctionIndex,
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Attribute::NoUnwind);
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AutoreleaseRVCallee =
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M->getOrInsertFunction("objc_autoreleaseReturnValue", FTy,
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Attribute);
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}
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return AutoreleaseRVCallee;
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}
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Constant *ObjCARCOpt::getReleaseCallee(Module *M) {
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if (!ReleaseCallee) {
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LLVMContext &C = M->getContext();
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Type *Params[] = { PointerType::getUnqual(Type::getInt8Ty(C)) };
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AttributeSet Attribute =
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AttributeSet().addAttribute(M->getContext(), AttributeSet::FunctionIndex,
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Attribute::NoUnwind);
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ReleaseCallee =
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M->getOrInsertFunction(
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"objc_release",
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FunctionType::get(Type::getVoidTy(C), Params, /*isVarArg=*/false),
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Attribute);
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}
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return ReleaseCallee;
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}
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Constant *ObjCARCOpt::getRetainCallee(Module *M) {
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if (!RetainCallee) {
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LLVMContext &C = M->getContext();
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Type *Params[] = { PointerType::getUnqual(Type::getInt8Ty(C)) };
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AttributeSet Attribute =
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AttributeSet().addAttribute(M->getContext(), AttributeSet::FunctionIndex,
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Attribute::NoUnwind);
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RetainCallee =
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M->getOrInsertFunction(
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"objc_retain",
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FunctionType::get(Params[0], Params, /*isVarArg=*/false),
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Attribute);
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}
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return RetainCallee;
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}
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Constant *ObjCARCOpt::getRetainBlockCallee(Module *M) {
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if (!RetainBlockCallee) {
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LLVMContext &C = M->getContext();
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Type *Params[] = { PointerType::getUnqual(Type::getInt8Ty(C)) };
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// objc_retainBlock is not nounwind because it calls user copy constructors
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// which could theoretically throw.
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RetainBlockCallee =
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M->getOrInsertFunction(
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"objc_retainBlock",
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FunctionType::get(Params[0], Params, /*isVarArg=*/false),
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AttributeSet());
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}
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return RetainBlockCallee;
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}
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Constant *ObjCARCOpt::getAutoreleaseCallee(Module *M) {
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if (!AutoreleaseCallee) {
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LLVMContext &C = M->getContext();
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Type *Params[] = { PointerType::getUnqual(Type::getInt8Ty(C)) };
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AttributeSet Attribute =
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AttributeSet().addAttribute(M->getContext(), AttributeSet::FunctionIndex,
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Attribute::NoUnwind);
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AutoreleaseCallee =
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M->getOrInsertFunction(
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"objc_autorelease",
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FunctionType::get(Params[0], Params, /*isVarArg=*/false),
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Attribute);
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}
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return AutoreleaseCallee;
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}
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/// Turn objc_retainAutoreleasedReturnValue into objc_retain if the operand is
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/// not a return value. Or, if it can be paired with an
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/// objc_autoreleaseReturnValue, delete the pair and return true.
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@ -1420,7 +1322,8 @@ ObjCARCOpt::OptimizeRetainRVCall(Function &F, Instruction *RetainRV) {
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"objc_retain since the operand is not a return value.\n"
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"Old = " << *RetainRV << "\n");
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cast<CallInst>(RetainRV)->setCalledFunction(getRetainCallee(F.getParent()));
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Constant *NewDecl = EP.get(ARCRuntimeEntryPoints::EPT_Retain);
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cast<CallInst>(RetainRV)->setCalledFunction(NewDecl);
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DEBUG(dbgs() << "New = " << *RetainRV << "\n");
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@ -1457,8 +1360,8 @@ ObjCARCOpt::OptimizeAutoreleaseRVCall(Function &F, Instruction *AutoreleaseRV,
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"Old = " << *AutoreleaseRV << "\n");
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CallInst *AutoreleaseRVCI = cast<CallInst>(AutoreleaseRV);
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AutoreleaseRVCI->
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setCalledFunction(getAutoreleaseCallee(F.getParent()));
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Constant *NewDecl = EP.get(ARCRuntimeEntryPoints::EPT_Autorelease);
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AutoreleaseRVCI->setCalledFunction(NewDecl);
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AutoreleaseRVCI->setTailCall(false); // Never tail call objc_autorelease.
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Class = IC_Autorelease;
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@ -1492,7 +1395,8 @@ ObjCARCOpt::OptimizeRetainBlockCall(Function &F, Instruction *Inst,
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DEBUG(dbgs() << "Strength reduced retainBlock => retain.\n");
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DEBUG(dbgs() << "Old: " << *Inst << "\n");
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CallInst *RetainBlock = cast<CallInst>(Inst);
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RetainBlock->setCalledFunction(getRetainCallee(F.getParent()));
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Constant *NewDecl = EP.get(ARCRuntimeEntryPoints::EPT_Retain);
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RetainBlock->setCalledFunction(NewDecl);
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// Remove copy_on_escape metadata.
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RetainBlock->setMetadata(CopyOnEscapeMDKind, 0);
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Class = IC_Retain;
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@ -1601,9 +1505,10 @@ void ObjCARCOpt::OptimizeIndividualCalls(Function &F) {
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// Create the declaration lazily.
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LLVMContext &C = Inst->getContext();
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CallInst *NewCall =
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CallInst::Create(getReleaseCallee(F.getParent()),
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Call->getArgOperand(0), "", Call);
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Constant *Decl = EP.get(ARCRuntimeEntryPoints::EPT_Release);
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CallInst *NewCall = CallInst::Create(Decl, Call->getArgOperand(0), "",
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Call);
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NewCall->setMetadata(ImpreciseReleaseMDKind, MDNode::get(C, None));
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DEBUG(dbgs() << "Replacing autorelease{,RV}(x) with objc_release(x) "
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@ -2519,8 +2424,8 @@ void ObjCARCOpt::MoveCalls(Value *Arg,
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Instruction *InsertPt = *PI;
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Value *MyArg = ArgTy == ParamTy ? Arg :
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new BitCastInst(Arg, ParamTy, "", InsertPt);
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CallInst *Call =
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CallInst::Create(getRetainCallee(M), MyArg, "", InsertPt);
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Constant *Decl = EP.get(ARCRuntimeEntryPoints::EPT_Retain);
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CallInst *Call = CallInst::Create(Decl, MyArg, "", InsertPt);
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Call->setDoesNotThrow();
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Call->setTailCall();
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@ -2533,8 +2438,8 @@ void ObjCARCOpt::MoveCalls(Value *Arg,
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Instruction *InsertPt = *PI;
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Value *MyArg = ArgTy == ParamTy ? Arg :
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new BitCastInst(Arg, ParamTy, "", InsertPt);
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CallInst *Call = CallInst::Create(getReleaseCallee(M), MyArg,
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"", InsertPt);
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Constant *Decl = EP.get(ARCRuntimeEntryPoints::EPT_Release);
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CallInst *Call = CallInst::Create(Decl, MyArg, "", InsertPt);
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// Attach a clang.imprecise_release metadata tag, if appropriate.
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if (MDNode *M = ReleasesToMove.ReleaseMetadata)
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Call->setMetadata(ImpreciseReleaseMDKind, M);
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@ -2892,9 +2797,8 @@ void ObjCARCOpt::OptimizeWeakCalls(Function &F) {
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Changed = true;
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// If the load has a builtin retain, insert a plain retain for it.
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if (Class == IC_LoadWeakRetained) {
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CallInst *CI =
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CallInst::Create(getRetainCallee(F.getParent()), EarlierCall,
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"", Call);
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Constant *Decl = EP.get(ARCRuntimeEntryPoints::EPT_Retain);
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CallInst *CI = CallInst::Create(Decl, EarlierCall, "", Call);
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CI->setTailCall();
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}
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// Zap the fully redundant load.
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@ -2922,9 +2826,8 @@ void ObjCARCOpt::OptimizeWeakCalls(Function &F) {
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Changed = true;
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// If the load has a builtin retain, insert a plain retain for it.
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if (Class == IC_LoadWeakRetained) {
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CallInst *CI =
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CallInst::Create(getRetainCallee(F.getParent()), EarlierCall,
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"", Call);
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Constant *Decl = EP.get(ARCRuntimeEntryPoints::EPT_Retain);
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CallInst *CI = CallInst::Create(Decl, EarlierCall, "", Call);
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CI->setTailCall();
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}
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// Zap the fully redundant load.
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@ -3238,12 +3141,8 @@ bool ObjCARCOpt::doInitialization(Module &M) {
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// they are not, because they return their argument value. And objc_release
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// calls finalizers which can have arbitrary side effects.
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// These are initialized lazily.
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AutoreleaseRVCallee = 0;
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ReleaseCallee = 0;
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RetainCallee = 0;
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RetainBlockCallee = 0;
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AutoreleaseCallee = 0;
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// Initialize our runtime entry point cache.
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EP.Initialize(&M);
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return false;
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}
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