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Add support for remapping metadata kind IDs when reading in a

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bitcode file, so that two bitcode files where the same metadata kind
name happens to have been assigned a different ID can still be
linked together.

Eliminate the restriction that metadata kind IDs can't be 0.

Change MD_dbg from 1 to 0, because we can now, and because it's
less mysterious that way.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108939 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-07-20 21:42:28 +00:00
parent a7f9563c01
commit 19538d1e9f
5 changed files with 19 additions and 16 deletions
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12
lib/Bitcode/Reader/BitcodeReader.cpp
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@ -39,6 +39,7 @@ void BitcodeReader::FreeState() {
std::vector<BasicBlock*>().swap(FunctionBBs);
std::vector<Function*>().swap(FunctionsWithBodies);
DeferredFunctionInfo.clear();
MDKindMap.clear();
}
//===----------------------------------------------------------------------===//
@ -859,13 +860,12 @@ bool BitcodeReader::ParseMetadata() {
SmallString<8> Name;
Name.resize(RecordLength-1);
unsigned Kind = Record[0];
(void) Kind;
for (unsigned i = 1; i != RecordLength; ++i)
Name[i-1] = Record[i];
unsigned NewKind = TheModule->getMDKindID(Name.str());
assert(Kind == NewKind &&
"FIXME: Unable to handle custom metadata mismatch!");(void)NewKind;
if (!MDKindMap.insert(std::make_pair(Kind, NewKind)).second)
return Error("Conflicting METADATA_KIND records");
break;
}
}
@ -1621,8 +1621,12 @@ bool BitcodeReader::ParseMetadataAttachment() {
Instruction *Inst = InstructionList[Record[0]];
for (unsigned i = 1; i != RecordLength; i = i+2) {
unsigned Kind = Record[i];
DenseMap<unsigned, unsigned>::iterator I =
MDKindMap.find(Kind);
if (I == MDKindMap.end())
return Error("Invalid metadata kind ID");
Value *Node = MDValueList.getValueFwdRef(Record[i+1]);
Inst->setMetadata(Kind, cast<MDNode>(Node));
Inst->setMetadata(I->second, cast<MDNode>(Node));
}
break;
}