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Add support for embedded metadata to LLVM. This introduces two new types of

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Constant, MDString and MDNode which can only be used by globals with a name
that starts with "llvm." or as arguments to a function with the same naming
restriction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68420 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2009-04-04 07:22:01 +00:00
parent 2cd1b777d7
commit 21cc4460ef
17 changed files with 518 additions and 9 deletions
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31
lib/Bitcode/Writer/BitcodeWriter.cpp
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@ -458,6 +458,8 @@ static void WriteConstants(unsigned FirstVal, unsigned LastVal,
unsigned String8Abbrev = 0;
unsigned CString7Abbrev = 0;
unsigned CString6Abbrev = 0;
unsigned MDString8Abbrev = 0;
unsigned MDString6Abbrev = 0;
// If this is a constant pool for the module, emit module-specific abbrevs.
if (isGlobal) {
// Abbrev for CST_CODE_AGGREGATE.
@ -485,6 +487,19 @@ static void WriteConstants(unsigned FirstVal, unsigned LastVal,
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
CString6Abbrev = Stream.EmitAbbrev(Abbv);
// Abbrev for CST_CODE_MDSTRING.
Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_MDSTRING));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
MDString8Abbrev = Stream.EmitAbbrev(Abbv);
// Abbrev for CST_CODE_MDSTRING.
Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_MDSTRING));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Char6));
MDString6Abbrev = Stream.EmitAbbrev(Abbv);
}
SmallVector<uint64_t, 64> Record;
@ -678,6 +693,22 @@ static void WriteConstants(unsigned FirstVal, unsigned LastVal,
Record.push_back(CE->getPredicate());
break;
}
} else if (const MDString *S = dyn_cast<MDString>(C)) {
Code = bitc::CST_CODE_MDSTRING;
AbbrevToUse = MDString6Abbrev;
for (unsigned i = 0, e = S->size(); i != e; ++i) {
char V = S->begin()[i];
Record.push_back(V);
if (!BitCodeAbbrevOp::isChar6(V))
AbbrevToUse = MDString8Abbrev;
}
} else if (const MDNode *N = dyn_cast<MDNode>(C)) {
Code = bitc::CST_CODE_MDNODE;
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
Record.push_back(VE.getTypeID(N->getOperand(i)->getType()));
Record.push_back(VE.getValueID(N->getOperand(i)));
}
} else {
assert(0 && "Unknown constant!");
}