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Discard metadata produced by LLVM 2.7. The value enumeration it used

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is different from what the code now uses in a two ways: NamedMDNodes
were considered Values and included in the numbering, and the
function-local metadata counter wasn't reset between functions.

The later problem breaks lazy deserialization, so instead of trying
to emulate the old numbering, just drop the old metadata. The only
in-tree use case is debug info with LTO, where the QOI loss is
considered acceptable.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113557 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-09-09 23:12:39 +00:00
parent 1ab6f2fa7a
commit 70c2fc0823
4 changed files with 72 additions and 22 deletions
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28
include/llvm/Bitcode/LLVMBitCodes.h
View File

@ -110,12 +110,20 @@ namespace bitc {
enum MetadataCodes {
METADATA_STRING = 1, // MDSTRING: [values]
METADATA_NODE = 2, // MDNODE: [n x (type num, value num)]
METADATA_FN_NODE = 3, // FN_MDNODE: [n x (type num, value num)]
// FIXME: Remove NODE in favor of NODE2 in LLVM 3.0
METADATA_NODE = 2, // NODE with potentially invalid metadata
// FIXME: Remove FN_NODE in favor of FN_NODE2 in LLVM 3.0
METADATA_FN_NODE = 3, // FN_NODE with potentially invalid metadata
METADATA_NAME = 4, // STRING: [values]
METADATA_NAMED_NODE = 5, // NAMEDMDNODE: [n x mdnodes]
// FIXME: Remove NAMED_NODE in favor of NAMED_NODE2 in LLVM 3.0
METADATA_NAMED_NODE = 5, // NAMED_NODE with potentially invalid metadata
METADATA_KIND = 6, // [n x [id, name]]
METADATA_ATTACHMENT = 7 // [m x [value, [n x [id, mdnode]]]
// FIXME: Remove ATTACHMENT in favor of ATTACHMENT2 in LLVM 3.0
METADATA_ATTACHMENT = 7, // ATTACHMENT with potentially invalid metadata
METADATA_NODE2 = 8, // NODE2: [n x (type num, value num)]
METADATA_FN_NODE2 = 9, // FN_NODE2: [n x (type num, value num)]
METADATA_NAMED_NODE2 = 10, // NAMED_NODE2: [n x mdnodes]
METADATA_ATTACHMENT2 = 11 // [m x [value, [n x [id, mdnode]]]
};
// The constants block (CONSTANTS_BLOCK_ID) describes emission for each
// constant and maintains an implicit current type value.
@ -223,7 +231,8 @@ namespace bitc {
FUNC_CODE_INST_LOAD = 20, // LOAD: [opty, op, align, vol]
// FIXME: Remove STORE in favor of STORE2 in LLVM 3.0
FUNC_CODE_INST_STORE = 21, // STORE: [valty,val,ptr, align, vol]
FUNC_CODE_INST_CALL = 22, // CALL: [attr, fnty, fnid, args...]
// FIXME: Remove CALL in favor of CALL2 in LLVM 3.0
FUNC_CODE_INST_CALL = 22, // CALL with potentially invalid metadata
FUNC_CODE_INST_VAARG = 23, // VAARG: [valistty, valist, instty]
// This store code encodes the pointer type, rather than the value type
// this is so information only available in the pointer type (e.g. address
@ -241,8 +250,13 @@ namespace bitc {
FUNC_CODE_INST_INBOUNDS_GEP= 30, // INBOUNDS_GEP: [n x operands]
FUNC_CODE_INST_INDIRECTBR = 31, // INDIRECTBR: [opty, op0, op1, ...]
FUNC_CODE_DEBUG_LOC = 32, // DEBUG_LOC: [Line,Col,ScopeVal, IAVal]
FUNC_CODE_DEBUG_LOC_AGAIN = 33 // DEBUG_LOC_AGAIN
// FIXME: Remove DEBUG_LOC in favor of DEBUG_LOC2 in LLVM 3.0
FUNC_CODE_DEBUG_LOC = 32, // DEBUG_LOC with potentially invalid metadata
FUNC_CODE_DEBUG_LOC_AGAIN = 33, // DEBUG_LOC_AGAIN
FUNC_CODE_INST_CALL2 = 34, // CALL2: [attr, fnty, fnid, args...]
FUNC_CODE_DEBUG_LOC2 = 35 // DEBUG_LOC2: [Line,Col,ScopeVal, IAVal]
};
} // End bitc namespace
} // End llvm namespace

46
lib/Bitcode/Reader/BitcodeReader.cpp
View File

@ -786,8 +786,12 @@ bool BitcodeReader::ParseMetadata() {
Record.clear();
Code = Stream.ReadCode();
// METADATA_NAME is always followed by METADATA_NAMED_NODE.
if (Stream.ReadRecord(Code, Record) != bitc::METADATA_NAMED_NODE)
// METADATA_NAME is always followed by METADATA_NAMED_NODE2.
unsigned NextBitCode = Stream.ReadRecord(Code, Record);
// FIXME: LLVM 3.0: Remove this.
if (NextBitCode == bitc::METADATA_NAMED_NODE)
break;
if (NextBitCode != bitc::METADATA_NAMED_NODE2)
assert ( 0 && "Inavlid Named Metadata record");
// Read named metadata elements.
@ -802,11 +806,19 @@ bool BitcodeReader::ParseMetadata() {
break;
}
case bitc::METADATA_FN_NODE:
// FIXME: Legacy support for the old fn_node, where function-local
// metadata operands were bogus. Remove in LLVM 3.0.
break;
case bitc::METADATA_NODE:
// FIXME: Legacy support for the old node, where function-local
// metadata operands were bogus. Remove in LLVM 3.0.
break;
case bitc::METADATA_FN_NODE2:
IsFunctionLocal = true;
// fall-through
case bitc::METADATA_NODE: {
case bitc::METADATA_NODE2: {
if (Record.size() % 2 == 1)
return Error("Invalid METADATA_NODE record");
return Error("Invalid METADATA_NODE2 record");
unsigned Size = Record.size();
SmallVector<Value*, 8> Elts;
@ -1593,7 +1605,10 @@ bool BitcodeReader::ParseMetadataAttachment() {
switch (Stream.ReadRecord(Code, Record)) {
default: // Default behavior: ignore.
break;
case bitc::METADATA_ATTACHMENT: {
case bitc::METADATA_ATTACHMENT:
// LLVM 3.0: Remove this.
break;
case bitc::METADATA_ATTACHMENT2: {
unsigned RecordLength = Record.size();
if (Record.empty() || (RecordLength - 1) % 2 == 1)
return Error ("Invalid METADATA_ATTACHMENT reader!");
@ -1706,7 +1721,11 @@ bool BitcodeReader::ParseFunctionBody(Function *F) {
I = 0;
continue;
case bitc::FUNC_CODE_DEBUG_LOC: { // DEBUG_LOC: [line, col, scope, ia]
case bitc::FUNC_CODE_DEBUG_LOC:
// FIXME: Ignore. Remove this in LLVM 3.0.
continue;
case bitc::FUNC_CODE_DEBUG_LOC2: { // DEBUG_LOC: [line, col, scope, ia]
I = 0; // Get the last instruction emitted.
if (CurBB && !CurBB->empty())
I = &CurBB->back();
@ -2221,7 +2240,12 @@ bool BitcodeReader::ParseFunctionBody(Function *F) {
InstructionList.push_back(I);
break;
}
case bitc::FUNC_CODE_INST_CALL: {
case bitc::FUNC_CODE_INST_CALL:
case bitc::FUNC_CODE_INST_CALL2: {
// FIXME: Legacy support for the old call instruction, where function-local
// metadata operands were bogus. Remove in LLVM 3.0.
bool DropMetadata = BitCode == bitc::FUNC_CODE_INST_CALL;
// CALL: [paramattrs, cc, fnty, fnid, arg0, arg1...]
if (Record.size() < 3)
return Error("Invalid CALL record");
@ -2245,7 +2269,13 @@ bool BitcodeReader::ParseFunctionBody(Function *F) {
for (unsigned i = 0, e = FTy->getNumParams(); i != e; ++i, ++OpNum) {
if (FTy->getParamType(i)->getTypeID()==Type::LabelTyID)
Args.push_back(getBasicBlock(Record[OpNum]));
else
else if (DropMetadata &&
FTy->getParamType(i)->getTypeID()==Type::MetadataTyID) {
// LLVM 2.7 compatibility: drop metadata arguments to null.
Value *Ops = 0;
Args.push_back(MDNode::get(Context, &Ops, 1));
continue;
} else
Args.push_back(getFnValueByID(Record[OpNum], FTy->getParamType(i)));
if (Args.back() == 0) return Error("Invalid CALL record");
}

14
lib/Bitcode/Writer/BitcodeWriter.cpp
View File

@ -485,8 +485,8 @@ static void WriteMDNode(const MDNode *N,
Record.push_back(0);
}
}
unsigned MDCode = N->isFunctionLocal() ? bitc::METADATA_FN_NODE :
bitc::METADATA_NODE;
unsigned MDCode = N->isFunctionLocal() ? bitc::METADATA_FN_NODE2 :
bitc::METADATA_NODE2;
Stream.EmitRecord(MDCode, Record, 0);
Record.clear();
}
@ -549,7 +549,7 @@ static void WriteModuleMetadata(const Module *M,
// Write named metadata operands.
for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
Record.push_back(VE.getValueID(NMD->getOperand(i)));
Stream.EmitRecord(bitc::METADATA_NAMED_NODE, Record, 0);
Stream.EmitRecord(bitc::METADATA_NAMED_NODE2, Record, 0);
Record.clear();
}
@ -585,7 +585,7 @@ static void WriteMetadataAttachment(const Function &F,
SmallVector<uint64_t, 64> Record;
// Write metadata attachments
// METADATA_ATTACHMENT - [m x [value, [n x [id, mdnode]]]
// METADATA_ATTACHMENT2 - [m x [value, [n x [id, mdnode]]]
SmallVector<std::pair<unsigned, MDNode*>, 4> MDs;
for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
@ -603,7 +603,7 @@ static void WriteMetadataAttachment(const Function &F,
Record.push_back(MDs[i].first);
Record.push_back(VE.getValueID(MDs[i].second));
}
Stream.EmitRecord(bitc::METADATA_ATTACHMENT, Record, 0);
Stream.EmitRecord(bitc::METADATA_ATTACHMENT2, Record, 0);
Record.clear();
}
@ -1111,7 +1111,7 @@ static void WriteInstruction(const Instruction &I, unsigned InstID,
const PointerType *PTy = cast<PointerType>(CI.getCalledValue()->getType());
const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
Code = bitc::FUNC_CODE_INST_CALL;
Code = bitc::FUNC_CODE_INST_CALL2;
Vals.push_back(VE.getAttributeID(CI.getAttributes()));
Vals.push_back((CI.getCallingConv() << 1) | unsigned(CI.isTailCall()));
@ -1255,7 +1255,7 @@ static void WriteFunction(const Function &F, ValueEnumerator &VE,
Vals.push_back(DL.getCol());
Vals.push_back(Scope ? VE.getValueID(Scope)+1 : 0);
Vals.push_back(IA ? VE.getValueID(IA)+1 : 0);
Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC, Vals);
Stream.EmitRecord(bitc::FUNC_CODE_DEBUG_LOC2, Vals);
Vals.clear();
LastDL = DL;

6
tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
View File

@ -236,6 +236,8 @@ static const char *GetCodeName(unsigned CodeID, unsigned BlockID,
case bitc::FUNC_CODE_INST_VSELECT: return "INST_VSELECT";
case bitc::FUNC_CODE_DEBUG_LOC: return "DEBUG_LOC";
case bitc::FUNC_CODE_DEBUG_LOC_AGAIN: return "DEBUG_LOC_AGAIN";
case bitc::FUNC_CODE_INST_CALL2: return "INST_CALL2";
case bitc::FUNC_CODE_DEBUG_LOC2: return "DEBUG_LOC2";
}
case bitc::TYPE_SYMTAB_BLOCK_ID:
switch (CodeID) {
@ -263,6 +265,10 @@ static const char *GetCodeName(unsigned CodeID, unsigned BlockID,
case bitc::METADATA_NAMED_NODE: return "METADATA_NAMED_NODE";
case bitc::METADATA_KIND: return "METADATA_KIND";
case bitc::METADATA_ATTACHMENT: return "METADATA_ATTACHMENT";
case bitc::METADATA_NODE2: return "METADATA_NODE2";
case bitc::METADATA_FN_NODE2: return "METADATA_FN_NODE2";
case bitc::METADATA_NAMED_NODE2: return "METADATA_NAMED_NODE2";
case bitc::METADATA_ATTACHMENT2: return "METADATA_ATTACHMENT2";
}
}
}