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Reapply "[IR] Move optional data in llvm::Function into a hungoff uselist"

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Make personality functions, prefix data, and prologue data hungoff
operands of Function.

This is based on the email thread "[RFC] Clean up the way we store
optional Function data" on llvm-dev.

Thanks to sanjoyd, majnemer, rnk, loladiro, and dexonsmith for feedback!

Includes a fix to scrub value subclass data in dropAllReferences.

Differential Revision: http://reviews.llvm.org/D13829

llvm-svn: 256093
This commit is contained in:
Vedant Kumar 2015-12-19 08:29:51 +00:00
parent 26f18dd6bb
commit c33a34516e
8 changed files with 92 additions and 168 deletions
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31
include/llvm/IR/Function.h
View File

@ -64,7 +64,7 @@ private:
* bit 0 : HasLazyArguments
* bit 1 : HasPrefixData
* bit 2 : HasPrologueData
* bit 3 : [reserved]
* bit 3 : HasPersonalityFn
* bits 4-13 : CallingConvention
* bits 14-15 : [reserved]
*/
@ -110,7 +110,7 @@ private:
public:
static Function *Create(FunctionType *Ty, LinkageTypes Linkage,
const Twine &N = "", Module *M = nullptr) {
return new(1) Function(Ty, Linkage, N, M);
return new Function(Ty, Linkage, N, M);
}
~Function() override;
@ -118,14 +118,6 @@ public:
/// \brief Provide fast operand accessors
DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
/// \brief Get the personality function associated with this function.
bool hasPersonalityFn() const { return getNumOperands() != 0; }
Constant *getPersonalityFn() const {
assert(hasPersonalityFn());
return cast<Constant>(Op<0>());
}
void setPersonalityFn(Constant *C);
Type *getReturnType() const; // Return the type of the ret val
FunctionType *getFunctionType() const; // Return the FunctionType for me
@ -525,17 +517,30 @@ public:
size_t arg_size() const;
bool arg_empty() const;
/// \brief Check whether this function has a personality function.
bool hasPersonalityFn() const {
return getSubclassDataFromValue() & (1<<3);
}
/// \brief Get the personality function associated with this function.
Constant *getPersonalityFn() const;
void setPersonalityFn(Constant *Fn);
/// \brief Check whether this function has prefix data.
bool hasPrefixData() const {
return getSubclassDataFromValue() & (1<<1);
}
/// \brief Get the prefix data associated with this function.
Constant *getPrefixData() const;
void setPrefixData(Constant *PrefixData);
/// \brief Check whether this function has prologue data.
bool hasPrologueData() const {
return getSubclassDataFromValue() & (1<<2);
}
/// \brief Get the prologue data associated with this function.
Constant *getPrologueData() const;
void setPrologueData(Constant *PrologueData);
@ -630,11 +635,15 @@ public:
DISubprogram *getSubprogram() const;
private:
void allocHungoffUselist();
template<int Idx> void setHungoffOperand(Constant *C);
// Shadow Value::setValueSubclassData with a private forwarding method so that
// subclasses cannot accidentally use it.
void setValueSubclassData(unsigned short D) {
Value::setValueSubclassData(D);
}
void setValueSubclassDataBit(unsigned Bit, bool On);
bool hasMetadataHashEntry() const {
return getGlobalObjectSubClassData() & HasMetadataHashEntryBit;
@ -647,7 +656,7 @@ private:
};
template <>
struct OperandTraits<Function> : public OptionalOperandTraits<Function> {};
struct OperandTraits<Function> : public HungoffOperandTraits<3> {};
DEFINE_TRANSPARENT_OPERAND_ACCESSORS(Function, Value)

13
include/llvm/IR/User.h
View File

@ -170,19 +170,6 @@ public:
NumUserOperands = NumOps;
}
/// Set the number of operands on a Function.
///
/// Function always allocates space for a single operands, but
/// doesn't always use it.
///
/// FIXME: As that the number of operands is used to find the start of
/// the allocated memory in operator delete, we need to always think we have
/// 1 operand before delete.
void setFunctionNumOperands(unsigned NumOps) {
assert(NumOps <= 1 && "Function can only have 0 or 1 operands");
NumUserOperands = NumOps;
}
/// \brief Subclasses with hung off uses need to manage the operand count
/// themselves. In these instances, the operand count isn't used to find the
/// OperandList, so there's no issue in having the operand count change.

36
lib/Bitcode/Writer/ValueEnumerator.cpp
View File

@ -87,15 +87,9 @@ static OrderMap orderModule(const Module &M) {
if (!isa<GlobalValue>(A.getAliasee()))
orderValue(A.getAliasee(), OM);
for (const Function &F : M) {
if (F.hasPrefixData())
if (!isa<GlobalValue>(F.getPrefixData()))
orderValue(F.getPrefixData(), OM);
if (F.hasPrologueData())
if (!isa<GlobalValue>(F.getPrologueData()))
orderValue(F.getPrologueData(), OM);
if (F.hasPersonalityFn())
if (!isa<GlobalValue>(F.getPersonalityFn()))
orderValue(F.getPersonalityFn(), OM);
for (const Use &U : F.operands())
if (!isa<GlobalValue>(U.get()))
orderValue(U.get(), OM);
}
OM.LastGlobalConstantID = OM.size();
@ -273,12 +267,8 @@ static UseListOrderStack predictUseListOrder(const Module &M) {
for (const GlobalAlias &A : M.aliases())
predictValueUseListOrder(A.getAliasee(), nullptr, OM, Stack);
for (const Function &F : M) {
if (F.hasPrefixData())
predictValueUseListOrder(F.getPrefixData(), nullptr, OM, Stack);
if (F.hasPrologueData())
predictValueUseListOrder(F.getPrologueData(), nullptr, OM, Stack);
if (F.hasPersonalityFn())
predictValueUseListOrder(F.getPersonalityFn(), nullptr, OM, Stack);
for (const Use &U : F.operands())
predictValueUseListOrder(U.get(), nullptr, OM, Stack);
}
return Stack;
@ -321,20 +311,10 @@ ValueEnumerator::ValueEnumerator(const Module &M,
for (const GlobalAlias &GA : M.aliases())
EnumerateValue(GA.getAliasee());
// Enumerate the prefix data constants.
// Enumerate any optional Function data.
for (const Function &F : M)
if (F.hasPrefixData())
EnumerateValue(F.getPrefixData());
// Enumerate the prologue data constants.
for (const Function &F : M)
if (F.hasPrologueData())
EnumerateValue(F.getPrologueData());
// Enumerate the personality functions.
for (Module::const_iterator I = M.begin(), E = M.end(); I != E; ++I)
if (I->hasPersonalityFn())
EnumerateValue(I->getPersonalityFn());
for (const Use &U : F.operands())
EnumerateValue(U.get());
// Enumerate the metadata type.
//

18
lib/IR/AsmWriter.cpp
View File

@ -103,17 +103,9 @@ static OrderMap orderModule(const Module *M) {
orderValue(&A, OM);
}
for (const Function &F : *M) {
if (F.hasPrefixData())
if (!isa<GlobalValue>(F.getPrefixData()))
orderValue(F.getPrefixData(), OM);
if (F.hasPrologueData())
if (!isa<GlobalValue>(F.getPrologueData()))
orderValue(F.getPrologueData(), OM);
if (F.hasPersonalityFn())
if (!isa<GlobalValue>(F.getPersonalityFn()))
orderValue(F.getPersonalityFn(), OM);
for (const Use &U : F.operands())
if (!isa<GlobalValue>(U.get()))
orderValue(U.get(), OM);
orderValue(&F, OM);
@ -263,8 +255,8 @@ static UseListOrderStack predictUseListOrder(const Module *M) {
for (const GlobalAlias &A : M->aliases())
predictValueUseListOrder(A.getAliasee(), nullptr, OM, Stack);
for (const Function &F : *M)
if (F.hasPrefixData())
predictValueUseListOrder(F.getPrefixData(), nullptr, OM, Stack);
for (const Use &U : F.operands())
predictValueUseListOrder(U.get(), nullptr, OM, Stack);
return Stack;
}

131
lib/IR/Function.cpp
View File

@ -279,9 +279,6 @@ Function::~Function() {
// Remove the function from the on-the-side GC table.
clearGC();
// FIXME: needed by operator delete
setFunctionNumOperands(1);
}
void Function::BuildLazyArguments() const {
@ -328,14 +325,15 @@ void Function::dropAllReferences() {
while (!BasicBlocks.empty())
BasicBlocks.begin()->eraseFromParent();
// Prefix and prologue data are stored in a side table.
setPrefixData(nullptr);
setPrologueData(nullptr);
// Drop uses of any optional data (real or placeholder).
if (getNumOperands()) {
User::dropAllReferences();
setNumHungOffUseOperands(0);
setValueSubclassData(getSubclassDataFromValue() & ~0b1110);
}
// Metadata is stored in a side-table.
clearMetadata();
setPersonalityFn(nullptr);
}
void Function::addAttribute(unsigned i, Attribute::AttrKind attr) {
@ -425,18 +423,12 @@ void Function::copyAttributesFrom(const GlobalValue *Src) {
setGC(SrcF->getGC());
else
clearGC();
if (SrcF->hasPrefixData())
setPrefixData(SrcF->getPrefixData());
else
setPrefixData(nullptr);
if (SrcF->hasPrologueData())
setPrologueData(SrcF->getPrologueData());
else
setPrologueData(nullptr);
if (SrcF->hasPersonalityFn())
setPersonalityFn(SrcF->getPersonalityFn());
else
setPersonalityFn(nullptr);
if (SrcF->hasPrefixData())
setPrefixData(SrcF->getPrefixData());
if (SrcF->hasPrologueData())
setPrologueData(SrcF->getPrologueData());
}
/// \brief This does the actual lookup of an intrinsic ID which
@ -944,61 +936,67 @@ bool Function::callsFunctionThatReturnsTwice() const {
return false;
}
static Constant *
getFunctionData(const Function *F,
const LLVMContextImpl::FunctionDataMapTy &Map) {
const auto &Entry = Map.find(F);
assert(Entry != Map.end());
return cast<Constant>(Entry->second->getReturnValue());
Constant *Function::getPersonalityFn() const {
assert(hasPersonalityFn() && getNumOperands());
return cast<Constant>(Op<0>());
}
/// setFunctionData - Set "Map[F] = Data". Return an updated SubclassData value
/// in which Bit is low iff Data is null.
static unsigned setFunctionData(Function *F,
LLVMContextImpl::FunctionDataMapTy &Map,
Constant *Data, unsigned SCData, unsigned Bit) {
ReturnInst *&Holder = Map[F];
if (Data) {
if (Holder)
Holder->setOperand(0, Data);
else
Holder = ReturnInst::Create(F->getContext(), Data);
return SCData | (1 << Bit);
} else {
delete Holder;
Map.erase(F);
return SCData & ~(1 << Bit);
}
void Function::setPersonalityFn(Constant *Fn) {
if (Fn)
setHungoffOperand<0>(Fn);
setValueSubclassDataBit(3, Fn != nullptr);
}
Constant *Function::getPrefixData() const {
assert(hasPrefixData());
return getFunctionData(this, getContext().pImpl->PrefixDataMap);
assert(hasPrefixData() && getNumOperands());
return cast<Constant>(Op<1>());
}
void Function::setPrefixData(Constant *PrefixData) {
if (!PrefixData && !hasPrefixData())
return;
unsigned SCData = getSubclassDataFromValue();
SCData = setFunctionData(this, getContext().pImpl->PrefixDataMap, PrefixData,
SCData, /*Bit=*/1);
setValueSubclassData(SCData);
if (PrefixData)
setHungoffOperand<1>(PrefixData);
setValueSubclassDataBit(1, PrefixData != nullptr);
}
Constant *Function::getPrologueData() const {
assert(hasPrologueData());
return getFunctionData(this, getContext().pImpl->PrologueDataMap);
assert(hasPrologueData() && getNumOperands());
return cast<Constant>(Op<2>());
}
void Function::setPrologueData(Constant *PrologueData) {
if (!PrologueData && !hasPrologueData())
if (PrologueData)
setHungoffOperand<2>(PrologueData);
setValueSubclassDataBit(2, PrologueData != nullptr);
}
void Function::allocHungoffUselist() {
// If we've already allocated a uselist, stop here.
if (getNumOperands())
return;
unsigned SCData = getSubclassDataFromValue();
SCData = setFunctionData(this, getContext().pImpl->PrologueDataMap,
PrologueData, SCData, /*Bit=*/2);
setValueSubclassData(SCData);
allocHungoffUses(3, /*IsPhi=*/ false);
setNumHungOffUseOperands(3);
// Initialize the uselist with placeholder operands to allow traversal.
auto *CPN = ConstantPointerNull::get(Type::getInt1PtrTy(getContext(), 0));
Op<0>().set(CPN);
Op<1>().set(CPN);
Op<2>().set(CPN);
}
template <int Idx>
void Function::setHungoffOperand(Constant *C) {
assert(C && "Cannot set hungoff operand to nullptr");
allocHungoffUselist();
Op<Idx>().set(C);
}
void Function::setValueSubclassDataBit(unsigned Bit, bool On) {
assert(Bit < 16 && "SubclassData contains only 16 bits");
if (On)
setValueSubclassData(getSubclassDataFromValue() | (1 << Bit));
else
setValueSubclassData(getSubclassDataFromValue() & ~(1 << Bit));
}
void Function::setEntryCount(uint64_t Count) {
@ -1016,22 +1014,3 @@ Optional<uint64_t> Function::getEntryCount() const {
}
return None;
}
void Function::setPersonalityFn(Constant *C) {
if (!C) {
if (hasPersonalityFn()) {
// Note, the num operands is used to compute the offset of the operand, so
// the order here matters. Clearing the operand then clearing the num
// operands ensures we have the correct offset to the operand.
Op<0>().set(nullptr);
setFunctionNumOperands(0);
}
} else {
// Note, the num operands is used to compute the offset of the operand, so
// the order here matters. We need to set num operands to 1 first so that
// we get the correct offset to the first operand when we set it.
if (!hasPersonalityFn())
setFunctionNumOperands(1);
Op<0>().set(C);
}
}

11
lib/IR/LLVMContextImpl.h
View File

@ -1014,17 +1014,6 @@ public:
/// instructions in different blocks at the same location.
DenseMap<std::pair<const char *, unsigned>, unsigned> DiscriminatorTable;
typedef DenseMap<const Function *, ReturnInst *> FunctionDataMapTy;
/// \brief Mapping from a function to its prefix data, which is stored as the
/// operand of an unparented ReturnInst so that the prefix data has a Use.
FunctionDataMapTy PrefixDataMap;
/// \brief Mapping from a function to its prologue data, which is stored as
/// the operand of an unparented ReturnInst so that the prologue data has a
/// Use.
FunctionDataMapTy PrologueDataMap;
int getOrAddScopeRecordIdxEntry(MDNode *N, int ExistingIdx);
int getOrAddScopeInlinedAtIdxEntry(MDNode *Scope, MDNode *IA,int ExistingIdx);

10
lib/IR/TypeFinder.cpp
View File

@ -44,14 +44,8 @@ void TypeFinder::run(const Module &M, bool onlyNamed) {
for (Module::const_iterator FI = M.begin(), E = M.end(); FI != E; ++FI) {
incorporateType(FI->getType());
if (FI->hasPrefixData())
incorporateValue(FI->getPrefixData());
if (FI->hasPrologueData())
incorporateValue(FI->getPrologueData());
if (FI->hasPersonalityFn())
incorporateValue(FI->getPersonalityFn());
for (const Use &U : FI->operands())
incorporateValue(U.get());
// First incorporate the arguments.
for (Function::const_arg_iterator AI = FI->arg_begin(),

10
lib/Transforms/IPO/GlobalDCE.cpp
View File

@ -215,14 +215,8 @@ void GlobalDCE::GlobalIsNeeded(GlobalValue *G) {
// any globals used will be marked as needed.
Function *F = cast<Function>(G);
if (F->hasPrefixData())
MarkUsedGlobalsAsNeeded(F->getPrefixData());
if (F->hasPrologueData())
MarkUsedGlobalsAsNeeded(F->getPrologueData());
if (F->hasPersonalityFn())
MarkUsedGlobalsAsNeeded(F->getPersonalityFn());
for (Use &U : F->operands())
MarkUsedGlobalsAsNeeded(cast<Constant>(U.get()));
for (BasicBlock &BB : *F)
for (Instruction &I : BB)