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The MDString class stored a StringRef to the string which was already in a

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StringMap. This was redundant and unnecessarily bloated the MDString class.

Because the MDString class is a "Value" and will never have a "name", and
because the Name field in the Value class is a pointer to a StringMap entry, we
repurpose the Name field for an MDString. It stores the StringMap entry in the
Name field, and uses the normal methods to get the string (name) back.

PR12474


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154429 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2012-04-10 20:12:16 +00:00
parent 7f1f145389
commit 3ecb447f52
5 changed files with 22 additions and 19 deletions
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13
lib/VMCore/Metadata.cpp
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@@ -31,16 +31,17 @@ using namespace llvm;
void MDString::anchor() { }
MDString::MDString(LLVMContext &C, StringRef S)
: Value(Type::getMetadataTy(C), Value::MDStringVal), Str(S) {}
MDString::MDString(LLVMContext &C)
: Value(Type::getMetadataTy(C), Value::MDStringVal) {}
MDString *MDString::get(LLVMContext &Context, StringRef Str) {
LLVMContextImpl *pImpl = Context.pImpl;
StringMapEntry<MDString *> &Entry =
StringMapEntry<Value*> &Entry =
pImpl->MDStringCache.GetOrCreateValue(Str);
MDString *&S = Entry.getValue();
if (!S) S = new MDString(Context, Entry.getKey());
return S;
Value *&S = Entry.getValue();
if (!S) S = new MDString(Context);
S->setValueName(&Entry);
return cast<MDString>(S);
}
//===----------------------------------------------------------------------===//