[IR] Add operand bundles to CallInst and InvokeInst.

Summary:
This change teaches `CallInst`s and `InvokeInst`s to maintain a set of
operand bundles as part of its operands.  `CallInst`s and `InvokeInst`s
with operand bundles co-allocate some space before their `Use` array to
hold meta information about which of its operands are part of an operand
bundle.

The strings corresponding to the bundle tags are interned into
`LLVMContextImpl::BundleTagCache`

This change does not include any parsing / bitcode support.  That's the
next change.

Depends on D12455.

Reviewers: reames, chandlerc, majnemer, dexonsmith, kmod, JosephTremoulet, rnk, bogner

Subscribers: MatzeB, sanjoy, llvm-commits

Differential Revision: http://reviews.llvm.org/D12456

llvm-svn: 248527

1 files changed, 17 insertions, 0 deletions

diff --git a/llvm/lib/IR/LLVMContextImpl.cpp b/llvm/lib/IR/LLVMContextImpl.cpp
index dc367fee884..5239b4f7d84 100644
--- a/llvm/lib/IR/LLVMContextImpl.cpp
+++ b/llvm/lib/IR/LLVMContextImpl.cpp
@@ -219,6 +219,23 @@ unsigned MDNodeOpsKey::calculateHash(ArrayRef<Metadata *> Ops) {
   return hash_combine_range(Ops.begin(), Ops.end());
 }
 
+StringMapEntry<uint32_t> *LLVMContextImpl::getOrInsertBundleTag(StringRef Tag) {
+  uint32_t NewIdx = BundleTagCache.size();
+  return &*(BundleTagCache.insert(std::make_pair(Tag, NewIdx)).first);
+}
+
+void LLVMContextImpl::getOperandBundleTags(SmallVectorImpl<StringRef> &Tags) const {
+  Tags.resize(BundleTagCache.size());
+  for (const auto &T : BundleTagCache)
+    Tags[T.second] = T.first();
+}
+
+uint32_t LLVMContextImpl::getOperandBundleTagID(StringRef Tag) const {
+  auto I = BundleTagCache.find(Tag);
+  assert(I != BundleTagCache.end() && "Unknown tag!");
+  return I->second;
+}
+
 // ConstantsContext anchors
 void UnaryConstantExpr::anchor() { }