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Support MDNode forward reference.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75031 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2009-07-08 19:23:54 +00:00
parent 59ae6b9987
commit 1c7eea60d3
3 changed files with 39 additions and 3 deletions
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35
lib/AsmParser/LLParser.cpp
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@ -84,6 +84,12 @@ bool LLParser::ValidateEndOfModule() {
"use of undefined value '@" +
utostr(ForwardRefValIDs.begin()->first) + "'");
if (!ForwardRefMDNodes.empty())
return Error(ForwardRefMDNodes.begin()->second.second,
"use of undefined metadata '!" +
utostr(ForwardRefMDNodes.begin()->first) + "'");
// Look for intrinsic functions and CallInst that need to be upgraded
for (Module::iterator FI = M->begin(), FE = M->end(); FI != FE; )
UpgradeCallsToIntrinsic(FI++); // must be post-increment, as we remove
@ -382,6 +388,14 @@ bool LLParser::ParseStandaloneMetadata() {
return true;
MetadataCache[MetadataID] = Init;
std::map<unsigned, std::pair<Constant *, LocTy> >::iterator
FI = ForwardRefMDNodes.find(MetadataID);
if (FI != ForwardRefMDNodes.end()) {
Constant *FwdNode = FI->second.first;
FwdNode->replaceAllUsesWith(Init);
ForwardRefMDNodes.erase(FI);
}
return false;
}
@ -1632,9 +1646,24 @@ bool LLParser::ParseValID(ValID &ID) {
unsigned MID = 0;
if (!ParseUInt32(MID)) {
std::map<unsigned, Constant *>::iterator I = MetadataCache.find(MID);
if (I == MetadataCache.end())
return TokError("Unknown metadata reference");
ID.ConstantVal = I->second;
if (I != MetadataCache.end())
ID.ConstantVal = I->second;
else {
std::map<unsigned, std::pair<Constant *, LocTy> >::iterator
FI = ForwardRefMDNodes.find(MID);
if (FI != ForwardRefMDNodes.end())
ID.ConstantVal = FI->second.first;
else {
// Create MDNode forward reference
SmallVector<Value *, 1> Elts;
std::string FwdRefName = "llvm.mdnode.fwdref." + MID;
Elts.push_back(Context.getMDString(FwdRefName));
MDNode *FwdNode = Context.getMDNode(Elts.data(), Elts.size());
ForwardRefMDNodes[MID] = std::make_pair(FwdNode, Lex.getLoc());
ID.ConstantVal = FwdNode;
}
}
return false;
}

2
lib/AsmParser/LLParser.h
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@ -46,6 +46,8 @@ namespace llvm {
std::vector<PATypeHolder> NumberedTypes;
/// MetadataCache - This map keeps track of parsed metadata constants.
std::map<unsigned, Constant *> MetadataCache;
std::map<unsigned, std::pair<Constant *, LocTy> > ForwardRefMDNodes;
struct UpRefRecord {
/// Loc - This is the location of the upref.
LocTy Loc;

5
test/Feature/mdnode4.ll Normal file
View File

@ -0,0 +1,5 @@
; Test forward MDNode reference
; RUN: llvm-as < %s | llvm-dis -f -o /dev/null
@llvm.blah = constant metadata !{metadata !1}
!1 = constant metadata !{i32 23, i32 24}