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Add support for metadata attachments for global variables.

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This patch adds an IR, assembly and bitcode representation for metadata
attachments for globals. Future patches will port existing features to use
these new attachments.

Differential Revision: http://reviews.llvm.org/D20074

llvm-svn: 271348
This commit is contained in:
Peter Collingbourne
2016-05-31 23:01:54 +00:00
parent 81fbadb63f
commit cceae7feda
18 changed files with 217 additions and 110 deletions
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16
llvm/lib/Bitcode/Writer/ValueEnumerator.cpp
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@@ -344,6 +344,11 @@ ValueEnumerator::ValueEnumerator(const Module &M,
EnumerateNamedMetadata(M);
SmallVector<std::pair<unsigned, MDNode *>, 8> MDs;
for (const GlobalVariable &GV : M.globals()) {
GV.getAllMetadata(MDs);
for (const auto &I : MDs)
EnumerateMetadata(&GV, I.second);
}
// Enumerate types used by function bodies and argument lists.
for (const Function &F : M) {
@@ -523,17 +528,18 @@ void ValueEnumerator::EnumerateNamedMDNode(const NamedMDNode *MD) {
EnumerateMetadata(nullptr, MD->getOperand(i));
}
unsigned ValueEnumerator::getMetadataFunctionID(const Function *F) const {
return F ? getValueID(F) + 1 : 0;
unsigned ValueEnumerator::getMetadataGlobalID(const GlobalObject *GO) const {
return GO ? getValueID(GO) + 1 : 0;
}
void ValueEnumerator::EnumerateMetadata(const Function *F, const Metadata *MD) {
EnumerateMetadata(getMetadataFunctionID(F), MD);
void ValueEnumerator::EnumerateMetadata(const GlobalObject *GO,
const Metadata *MD) {
EnumerateMetadata(getMetadataGlobalID(GO), MD);
}
void ValueEnumerator::EnumerateFunctionLocalMetadata(
const Function &F, const LocalAsMetadata *Local) {
EnumerateFunctionLocalMetadata(getMetadataFunctionID(&F), Local);
EnumerateFunctionLocalMetadata(getMetadataGlobalID(&F), Local);
}
void ValueEnumerator::dropFunctionFromMetadata(