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IR: Introduce GenericDwarfNode

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As part of PR22235, introduce `DwarfNode` and `GenericDwarfNode`.  The
former is a metadata node with a DWARF tag.  The latter matches our
current (generic) schema of a header with string (and stringified
integer) data and an arbitrary number of operands.

This doesn't move it into place yet; that change will require a large
number of testcase updates.

llvm-svn: 226529
This commit is contained in:
Duncan P. N. Exon Smith 2015-01-20 00:01:43 +00:00
parent c1c7b46705
commit 0973b855f5
8 changed files with 249 additions and 18 deletions
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2
include/llvm/IR/Metadata.def
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@ -49,6 +49,8 @@ HANDLE_METADATA_LEAF(LocalAsMetadata)
HANDLE_MDNODE_BRANCH(MDNode)
HANDLE_MDNODE_LEAF(MDTuple)
HANDLE_MDNODE_LEAF(MDLocation)
HANDLE_MDNODE_BRANCH(DwarfNode)
HANDLE_MDNODE_LEAF(GenericDwarfNode)
#undef HANDLE_METADATA
#undef HANDLE_METADATA_LEAF

104
include/llvm/IR/Metadata.h
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@ -61,6 +61,7 @@ public:
enum MetadataKind {
MDTupleKind,
MDLocationKind,
GenericDwarfNodeKind,
ConstantAsMetadataKind,
LocalAsMetadataKind,
MDStringKind
@ -704,7 +705,7 @@ protected:
}
MDNode(LLVMContext &Context, unsigned ID, StorageType Storage,
ArrayRef<Metadata *> MDs);
ArrayRef<Metadata *> Ops1, ArrayRef<Metadata *> Ops2 = None);
~MDNode() {}
void dropAllReferences();
@ -847,7 +848,8 @@ public:
/// \brief Methods for support type inquiry through isa, cast, and dyn_cast:
static bool classof(const Metadata *MD) {
return MD->getMetadataID() == MDTupleKind ||
MD->getMetadataID() == MDLocationKind;
MD->getMetadataID() == MDLocationKind ||
MD->getMetadataID() == GenericDwarfNodeKind;
}
/// \brief Check whether MDNode is a vtable access.
@ -989,6 +991,104 @@ public:
}
};
/// \brief Tagged dwarf node.
///
/// A metadata node with a DWARF tag.
class DwarfNode : public MDNode {
friend class LLVMContextImpl;
friend class MDNode;
protected:
DwarfNode(LLVMContext &C, unsigned ID, StorageType Storage, unsigned Tag,
ArrayRef<Metadata *> Ops1, ArrayRef<Metadata *> Ops2 = None)
: MDNode(C, ID, Storage, Ops1, Ops2) {
assert(Tag < 1u << 16);
SubclassData16 = Tag;
}
~DwarfNode() {}
public:
unsigned getTag() const { return SubclassData16; }
static bool classof(const Metadata *MD) {
return MD->getMetadataID() == GenericDwarfNodeKind;
}
};
/// \brief Generic tagged dwarf node.
///
/// A generic metadata node with a DWARF tag that doesn't have special
/// handling.
class GenericDwarfNode : public DwarfNode {
friend class LLVMContextImpl;
friend class MDNode;
GenericDwarfNode(LLVMContext &C, StorageType Storage, unsigned Hash,
unsigned Tag, ArrayRef<Metadata *> Ops1,
ArrayRef<Metadata *> Ops2)
: DwarfNode(C, GenericDwarfNodeKind, Storage, Tag, Ops1, Ops2) {
setHash(Hash);
}
~GenericDwarfNode() { dropAllReferences(); }
void setHash(unsigned Hash) { SubclassData32 = Hash; }
void recalculateHash();
static GenericDwarfNode *getImpl(LLVMContext &Context, unsigned Tag,
MDString *Header,
ArrayRef<Metadata *> DwarfOps,
StorageType Storage,
bool ShouldCreate = true);
public:
unsigned getHash() const { return SubclassData32; }
static GenericDwarfNode *get(LLVMContext &Context,
unsigned Tag,
MDString *Header,
ArrayRef<Metadata *> DwarfOps) {
return getImpl(Context, Tag, Header, DwarfOps, Uniqued);
}
static GenericDwarfNode *getIfExists(LLVMContext &Context, unsigned Tag,
MDString *Header,
ArrayRef<Metadata *> DwarfOps) {
return getImpl(Context, Tag, Header, DwarfOps, Uniqued,
/* ShouldCreate */ false);
}
static GenericDwarfNode *getDistinct(LLVMContext &Context, unsigned Tag,
MDString *Header,
ArrayRef<Metadata *> DwarfOps) {
return getImpl(Context, Tag, Header, DwarfOps, Distinct);
}
static TempGenericDwarfNode getTemporary(LLVMContext &Context, unsigned Tag,
MDString *Header,
ArrayRef<Metadata *> DwarfOps) {
return TempGenericDwarfNode(
getImpl(Context, Tag, Header, DwarfOps, Temporary));
}
unsigned getTag() const { return SubclassData16; }
MDString *getHeader() const { return cast_or_null<MDString>(getOperand(0)); }
op_iterator dwarf_op_begin() const { return op_begin() + 1; }
op_iterator dwarf_op_end() const { return op_end(); }
op_range dwarf_operands() const {
return op_range(dwarf_op_begin(), dwarf_op_end());
}
unsigned getNumDwarfOperands() const { return getNumOperands() - 1; }
const MDOperand &getDwarfOperand(unsigned I) const {
return getOperand(I + 1);
}
void replaceDwarfOperandWith(unsigned I, Metadata *New) {
replaceOperandWith(I + 1, New);
}
static bool classof(const Metadata *MD) {
return MD->getMetadataID() == GenericDwarfNodeKind;
}
};
//===----------------------------------------------------------------------===//
/// \brief A tuple of MDNodes.
///

6
lib/IR/AsmWriter.cpp
View File

@ -1286,6 +1286,12 @@ raw_ostream &operator<<(raw_ostream &OS, FieldSeparator &FS) {
}
} // end namespace
static void writeGenericDwarfNode(raw_ostream &, const GenericDwarfNode *,
TypePrinting *, SlotTracker *,
const Module *) {
llvm_unreachable("Unimplemented write");
}
static void writeMDLocation(raw_ostream &Out, const MDLocation *DL,
TypePrinting *TypePrinter, SlotTracker *Machine,
const Module *Context) {

6
lib/IR/LLVMContextImpl.cpp
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@ -180,11 +180,11 @@ namespace llvm {
static const Metadata *get_hashable_data(const MDOperand &X) { return X.get(); }
}
unsigned MDNodeOpsKey::calculateHash(MDNode *N) {
unsigned Hash = hash_combine_range(N->op_begin(), N->op_end());
unsigned MDNodeOpsKey::calculateHash(MDNode *N, unsigned Offset) {
unsigned Hash = hash_combine_range(N->op_begin() + Offset, N->op_end());
#ifndef NDEBUG
{
SmallVector<Metadata *, 8> MDs(N->op_begin(), N->op_end());
SmallVector<Metadata *, 8> MDs(N->op_begin() + Offset, N->op_end());
unsigned RawHash = calculateHash(MDs);
assert(Hash == RawHash &&
"Expected hash of MDOperand to equal hash of Metadata*");

61
lib/IR/LLVMContextImpl.h
View File

@ -179,25 +179,27 @@ protected:
: RawOps(Ops), Hash(calculateHash(Ops)) {}
template <class NodeTy>
MDNodeOpsKey(NodeTy *N)
: Ops(N->op_begin(), N->op_end()), Hash(N->getHash()) {}
MDNodeOpsKey(NodeTy *N, unsigned Offset = 0)
: Ops(N->op_begin() + Offset, N->op_end()), Hash(N->getHash()) {}
template <class NodeTy> bool compareOps(const NodeTy *RHS) const {
template <class NodeTy>
bool compareOps(const NodeTy *RHS, unsigned Offset = 0) const {
if (getHash() != RHS->getHash())
return false;
assert((RawOps.empty() || Ops.empty()) && "Two sets of operands?");
return RawOps.empty() ? compareOps(Ops, RHS) : compareOps(RawOps, RHS);
return RawOps.empty() ? compareOps(Ops, RHS, Offset)
: compareOps(RawOps, RHS, Offset);
}
static unsigned calculateHash(MDNode *N);
static unsigned calculateHash(MDNode *N, unsigned Offset = 0);
private:
template <class T>
static bool compareOps(ArrayRef<T> Ops, const MDNode *RHS) {
if (Ops.size() != RHS->getNumOperands())
static bool compareOps(ArrayRef<T> Ops, const MDNode *RHS, unsigned Offset) {
if (Ops.size() != RHS->getNumOperands() - Offset)
return false;
return std::equal(Ops.begin(), Ops.end(), RHS->op_begin());
return std::equal(Ops.begin(), Ops.end(), RHS->op_begin() + Offset);
}
static unsigned calculateHash(ArrayRef<Metadata *> Ops);
@ -283,6 +285,48 @@ struct MDLocationInfo {
}
};
/// \brief DenseMapInfo for GenericDwarfNode.
struct GenericDwarfNodeInfo {
struct KeyTy : MDNodeOpsKey {
unsigned Tag;
MDString *Header;
KeyTy(unsigned Tag, MDString *Header, ArrayRef<Metadata *> DwarfOps)
: MDNodeOpsKey(DwarfOps), Tag(Tag), Header(Header) {}
KeyTy(GenericDwarfNode *N)
: MDNodeOpsKey(N, 1), Tag(N->getTag()), Header(N->getHeader()) {}
bool operator==(const GenericDwarfNode *RHS) const {
if (RHS == getEmptyKey() || RHS == getTombstoneKey())
return false;
return Tag == RHS->getTag() && Header == RHS->getHeader() &&
compareOps(RHS, 1);
}
static unsigned calculateHash(GenericDwarfNode *N) {
return MDNodeOpsKey::calculateHash(N, 1);
}
};
static inline GenericDwarfNode *getEmptyKey() {
return DenseMapInfo<GenericDwarfNode *>::getEmptyKey();
}
static inline GenericDwarfNode *getTombstoneKey() {
return DenseMapInfo<GenericDwarfNode *>::getTombstoneKey();
}
static unsigned getHashValue(const KeyTy &Key) {
return hash_combine(Key.getHash(), Key.Tag, Key.Header);
}
static unsigned getHashValue(const GenericDwarfNode *U) {
return hash_combine(U->getHash(), U->getTag(), U->getHeader());
}
static bool isEqual(const KeyTy &LHS, const GenericDwarfNode *RHS) {
return LHS == RHS;
}
static bool isEqual(const GenericDwarfNode *LHS,
const GenericDwarfNode *RHS) {
return LHS == RHS;
}
};
class LLVMContextImpl {
public:
/// OwnedModules - The set of modules instantiated in this context, and which
@ -315,6 +359,7 @@ public:
DenseSet<MDTuple *, MDTupleInfo> MDTuples;
DenseSet<MDLocation *, MDLocationInfo> MDLocations;
DenseSet<GenericDwarfNode *, GenericDwarfNodeInfo> GenericDwarfNodes;
// MDNodes may be uniqued or not uniqued. When they're not uniqued, they
// aren't in the MDNodeSet, but they're still shared between objects, so no

45
lib/IR/Metadata.cpp
View File

@ -397,11 +397,14 @@ void MDNode::operator delete(void *Mem) {
}
MDNode::MDNode(LLVMContext &Context, unsigned ID, StorageType Storage,
ArrayRef<Metadata *> MDs)
: Metadata(ID, Storage), NumOperands(MDs.size()), NumUnresolved(0),
Context(Context) {
for (unsigned I = 0, E = MDs.size(); I != E; ++I)
setOperand(I, MDs[I]);
ArrayRef<Metadata *> Ops1, ArrayRef<Metadata *> Ops2)
: Metadata(ID, Storage), NumOperands(Ops1.size() + Ops2.size()),
NumUnresolved(0), Context(Context) {
unsigned Op = 0;
for (Metadata *MD : Ops1)
setOperand(Op++, MD);
for (Metadata *MD : Ops2)
setOperand(Op++, MD);
if (isDistinct())
return;
@ -527,6 +530,10 @@ void MDTuple::recalculateHash() {
setHash(MDTupleInfo::KeyTy::calculateHash(this));
}
void GenericDwarfNode::recalculateHash() {
setHash(GenericDwarfNodeInfo::KeyTy::calculateHash(this));
}
void MDNode::dropAllReferences() {
for (unsigned I = 0, E = NumOperands; I != E; ++I)
setOperand(I, nullptr);
@ -621,6 +628,9 @@ MDNode *MDNode::uniquify() {
case MDTupleKind:
cast<MDTuple>(this)->recalculateHash();
break;
case GenericDwarfNodeKind:
cast<GenericDwarfNode>(this)->recalculateHash();
break;
}
// Try to insert into uniquing store.
@ -733,6 +743,29 @@ MDLocation *MDLocation::getImpl(LLVMContext &Context, unsigned Line,
Storage, Context.pImpl->MDLocations);
}
GenericDwarfNode *GenericDwarfNode::getImpl(LLVMContext &Context, unsigned Tag,
MDString *Header,
ArrayRef<Metadata *> DwarfOps,
StorageType Storage,
bool ShouldCreate) {
unsigned Hash = 0;
if (Storage == Uniqued) {
GenericDwarfNodeInfo::KeyTy Key(Tag, Header, DwarfOps);
if (auto *N = getUniqued(Context.pImpl->GenericDwarfNodes, Key))
return N;
if (!ShouldCreate)
return nullptr;
Hash = Key.getHash();
} else {
assert(ShouldCreate && "Expected non-uniqued nodes to always be created");
}
Metadata *PreOps[] = {Header};
return storeImpl(new (DwarfOps.size() + 1) GenericDwarfNode(
Context, Storage, Hash, Tag, PreOps, DwarfOps),
Storage, Context.pImpl->GenericDwarfNodes);
}
void MDNode::deleteTemporary(MDNode *N) {
assert(N->isTemporary() && "Expected temporary node");
N->deleteAsSubclass();
@ -743,6 +776,8 @@ void MDNode::storeDistinctInContext() {
Storage = Distinct;
if (auto *T = dyn_cast<MDTuple>(this))
T->setHash(0);
else if (auto *G = dyn_cast<GenericDwarfNode>(this))
G->setHash(0);
getContext().pImpl->DistinctMDNodes.insert(this);
}

8
lib/Transforms/Utils/ValueMapper.cpp
View File

@ -192,6 +192,14 @@ static TempMDLocation cloneMDLocation(const MDLocation *Node) {
Node->getInlinedAt());
}
static TempGenericDwarfNode
cloneGenericDwarfNode(const GenericDwarfNode *Node) {
SmallVector<Metadata *, 4> DwarfOps;
DwarfOps.append(Node->dwarf_op_begin(), Node->dwarf_op_end());
return GenericDwarfNode::getTemporary(Node->getContext(), Node->getTag(),
Node->getHeader(), DwarfOps);
}
static TempMDNode cloneMDNode(const MDNode *Node) {
switch (Node->getMetadataID()) {
default:

35
unittests/IR/MetadataTest.cpp
View File

@ -561,6 +561,41 @@ TEST_F(MDLocationTest, getTemporary) {
EXPECT_FALSE(L->isResolved());
}
typedef MetadataTest GenericDwarfNodeTest;
TEST_F(GenericDwarfNodeTest, get) {
auto *Header = MDString::get(Context, "header");
auto *Empty = MDNode::get(Context, None);
Metadata *Ops1[] = {Empty};
auto *N = GenericDwarfNode::get(Context, 15, Header, Ops1);
EXPECT_EQ(15u, N->getTag());
EXPECT_EQ(2u, N->getNumOperands());
EXPECT_EQ(Header, N->getHeader());
EXPECT_EQ(Header, N->getOperand(0));
EXPECT_EQ(1u, N->getNumDwarfOperands());
EXPECT_EQ(Empty, N->getDwarfOperand(0));
EXPECT_EQ(Empty, N->getOperand(1));
ASSERT_TRUE(N->isUniqued());
EXPECT_EQ(N, GenericDwarfNode::get(Context, 15, Header, Ops1));
N->replaceOperandWith(1, nullptr);
EXPECT_EQ(15u, N->getTag());
EXPECT_EQ(Header, N->getHeader());
EXPECT_EQ(nullptr, N->getDwarfOperand(0));
ASSERT_TRUE(N->isUniqued());
Metadata *Ops2[] = {nullptr};
EXPECT_EQ(N, GenericDwarfNode::get(Context, 15, Header, Ops2));
N->replaceDwarfOperandWith(0, Empty);
EXPECT_EQ(15u, N->getTag());
EXPECT_EQ(Header, N->getHeader());
EXPECT_EQ(Empty, N->getDwarfOperand(0));
ASSERT_TRUE(N->isUniqued());
EXPECT_EQ(N, GenericDwarfNode::get(Context, 15, Header, Ops1));
}
typedef MetadataTest MetadataAsValueTest;
TEST_F(MetadataAsValueTest, MDNode) {