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add support for array abbreviations.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36754 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-05-04 20:33:47 +00:00
parent 15e6d170e8
commit 3c074f61ed
3 changed files with 101 additions and 59 deletions
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52
include/llvm/Bitcode/BitstreamReader.h
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@ -274,6 +274,26 @@ public:
// Record Processing
//===--------------------------------------------------------------------===//
private:
void ReadAbbreviatedField(const BitCodeAbbrevOp &Op,
SmallVectorImpl<uint64_t> &Vals) {
if (Op.isLiteral()) {
// If the abbrev specifies the literal value to use, use it.
Vals.push_back(Op.getLiteralValue());
} else {
// Decode the value as we are commanded.
switch (Op.getEncoding()) {
default: assert(0 && "Unknown encoding!");
case BitCodeAbbrevOp::Fixed:
Vals.push_back(Read(Op.getEncodingData()));
break;
case BitCodeAbbrevOp::VBR:
Vals.push_back(ReadVBR64(Op.getEncodingData()));
break;
}
}
}
public:
unsigned ReadRecord(unsigned AbbrevID, SmallVectorImpl<uint64_t> &Vals) {
if (AbbrevID == bitc::UNABBREV_RECORD) {
unsigned Code = ReadVBR(6);
@ -289,20 +309,19 @@ public:
for (unsigned i = 0, e = Abbv->getNumOperandInfos(); i != e; ++i) {
const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
if (Op.isLiteral()) {
// If the abbrev specifies the literal value to use, use it.
Vals.push_back(Op.getLiteralValue());
if (Op.isLiteral() || Op.getEncoding() != BitCodeAbbrevOp::Array) {
ReadAbbreviatedField(Op, Vals);
} else {
// Decode the value as we are commanded.
switch (Op.getEncoding()) {
default: assert(0 && "Unknown encoding!");
case BitCodeAbbrevOp::FixedWidth:
Vals.push_back(Read(Op.getEncodingData()));
break;
case BitCodeAbbrevOp::VBR:
Vals.push_back(ReadVBR64(Op.getEncodingData()));
break;
}
// Array case. Read the number of elements as a vbr6.
unsigned NumElts = ReadVBR(6);
// Get the element encoding.
assert(i+2 == e && "array op not second to last?");
const BitCodeAbbrevOp &EltEnc = Abbv->getOperandInfo(++i);
// Read all the elements.
for (; NumElts; --NumElts)
ReadAbbreviatedField(EltEnc, Vals);
}
}
@ -326,11 +345,10 @@ public:
}
BitCodeAbbrevOp::Encoding E = (BitCodeAbbrevOp::Encoding)Read(3);
if (BitCodeAbbrevOp::hasEncodingData(E)) {
if (BitCodeAbbrevOp::hasEncodingData(E))
Abbv->Add(BitCodeAbbrevOp(E, ReadVBR64(5)));
} else {
assert(0 && "unimp");
}
else
Abbv->Add(BitCodeAbbrevOp(E));
}
CurAbbrevs.push_back(Abbv);
}