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IR: Add Function metadata attachments

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Add IR support for `Metadata` attachments.  Assembly and bitcode support
will follow shortly, but for now we just have unit tests.  This is part
of PR23340.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235783 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-04-24 21:51:02 +00:00
parent 233c2e7216
commit eb79bb6e61
5 changed files with 230 additions and 1 deletions
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41
include/llvm/IR/Function.h
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@@ -80,7 +80,8 @@ private:
/// Bits from GlobalObject::GlobalObjectSubclassData.
enum {
/// Whether this function is materializable.
IsMaterializableBit = 1 << 0
IsMaterializableBit = 1 << 0,
HasMetadataHashEntryBit = 1 << 1
};
void setGlobalObjectBit(unsigned Mask, bool Value) {
setGlobalObjectSubClassData((~Mask & getGlobalObjectSubClassData()) |
@@ -521,12 +522,50 @@ public:
/// setjmp or other function that gcc recognizes as "returning twice".
bool callsFunctionThatReturnsTwice() const;
/// \brief Check if this has any metadata.
bool hasMetadata() const { return hasMetadataHashEntry(); }
/// \brief Get the current metadata attachment, if any.
///
/// Returns \c nullptr if such an attachment is missing.
/// @{
MDNode *getMetadata(unsigned KindID) const;
MDNode *getMetadata(StringRef Kind) const;
/// @}
/// \brief Set a particular kind of metadata attachment.
///
/// Sets the given attachment to \c MD, erasing it if \c MD is \c nullptr or
/// replacing it if it already exists.
/// @{
void setMetadata(unsigned KindID, MDNode *MD);
void setMetadata(StringRef Kind, MDNode *MD);
/// @}
/// \brief Get all current metadata attachments.
void
getAllMetadata(SmallVectorImpl<std::pair<unsigned, MDNode *>> &MDs) const;
/// \brief Drop metadata not in the given list.
///
/// Drop all metadata from \c this not included in \c KnownIDs.
void dropUnknownMetadata(ArrayRef<unsigned> KnownIDs);
private:
// Shadow Value::setValueSubclassData with a private forwarding method so that
// subclasses cannot accidentally use it.
void setValueSubclassData(unsigned short D) {
Value::setValueSubclassData(D);
}
bool hasMetadataHashEntry() const {
return getGlobalObjectSubClassData() & HasMetadataHashEntryBit;
}
void setHasMetadataHashEntry(bool HasEntry) {
setGlobalObjectBit(HasMetadataHashEntryBit, HasEntry);
}
void clearMetadata();
};
inline ValueSymbolTable *