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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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22
include/llvm/Bitcode/BitCodes.h
View File

@ -84,13 +84,15 @@ class BitCodeAbbrevOp {
unsigned Enc : 3; // The encoding to use.
public:
enum Encoding {
FixedWidth = 1, // A fixed with field, Val specifies number of bits.
VBR = 2 // A VBR field where Val specifies the width of each chunk.
Fixed = 1, // A fixed with field, Val specifies number of bits.
VBR = 2, // A VBR field where Val specifies the width of each chunk.
Array = 3 // A sequence of fields, next field species elt encoding.
};
BitCodeAbbrevOp(uint64_t V) : Val(V), IsLiteral(true) {}
BitCodeAbbrevOp(Encoding E, uint64_t Data)
BitCodeAbbrevOp(Encoding E, uint64_t Data = 0)
: Val(Data), IsLiteral(false), Enc(E) {}
bool isLiteral() const { return IsLiteral; }
bool isEncoding() const { return !IsLiteral; }
@ -100,11 +102,21 @@ public:
// Accessors for encoding info.
Encoding getEncoding() const { assert(isEncoding()); return (Encoding)Enc; }
uint64_t getEncodingData() const { assert(isEncoding()); return Val; }
uint64_t getEncodingData() const {
assert(isEncoding() && hasEncodingData());
return Val;
}
bool hasEncodingData() const { return hasEncodingData(getEncoding()); }
static bool hasEncodingData(Encoding E) {
return true;
switch (E) {
default: assert(0 && "Unknown encoding");
case Fixed:
case VBR:
return true;
case Array:
return false;
}
}
};

52
include/llvm/Bitcode/BitstreamReader.h
View File

@ -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);
}

86
include/llvm/Bitcode/BitstreamWriter.h
View File

@ -189,6 +189,32 @@ public:
// Record Emission
//===--------------------------------------------------------------------===//
private:
/// EmitAbbreviatedField - Emit a single scalar field value with the specified
/// encoding.
template<typename uintty>
void EmitAbbreviatedField(const BitCodeAbbrevOp &Op, uintty V) {
if (Op.isLiteral()) {
// If the abbrev specifies the literal value to use, don't emit
// anything.
assert(V == Op.getLiteralValue() &&
"Invalid abbrev for record!");
return;
}
// Encode the value as we are commanded.
switch (Op.getEncoding()) {
default: assert(0 && "Unknown encoding!");
case BitCodeAbbrevOp::Fixed:
Emit(V, Op.getEncodingData());
break;
case BitCodeAbbrevOp::VBR:
EmitVBR(V, Op.getEncodingData());
break;
}
}
public:
/// EmitRecord - Emit the specified record to the stream, using an abbrev if
/// we have one to compress the output.
void EmitRecord(unsigned Code, SmallVectorImpl<uint64_t> &Vals,
@ -207,27 +233,20 @@ public:
for (unsigned i = 0, e = Abbv->getNumOperandInfos(); i != e; ++i) {
assert(RecordIdx < Vals.size() && "Invalid abbrev/record");
const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
uint64_t RecordVal = Vals[RecordIdx];
if (Op.isLiteral()) {
// If the abbrev specifies the literal value to use, don't emit
// anything.
assert(RecordVal == Op.getLiteralValue() &&
"Invalid abbrev for record!");
if (Op.isLiteral() || Op.getEncoding() != BitCodeAbbrevOp::Array) {
EmitAbbreviatedField(Op, Vals[RecordIdx]);
++RecordIdx;
} else {
// Encode the value as we are commanded.
switch (Op.getEncoding()) {
default: assert(0 && "Unknown encoding!");
case BitCodeAbbrevOp::FixedWidth:
Emit64(RecordVal, Op.getEncodingData());
++RecordIdx;
break;
case BitCodeAbbrevOp::VBR:
EmitVBR64(RecordVal, Op.getEncodingData());
++RecordIdx;
break;
}
// Array case.
assert(i+2 == e && "array op not second to last?");
const BitCodeAbbrevOp &EltEnc = Abbv->getOperandInfo(++i);
// Emit a vbr6 to indicate the number of elements present.
EmitVBR(Vals.size()-RecordIdx, 6);
// Emit each field.
for (; RecordIdx != Vals.size(); ++RecordIdx)
EmitAbbreviatedField(EltEnc, Vals[RecordIdx]);
}
}
assert(RecordIdx == Vals.size() && "Not all record operands emitted!");
@ -260,27 +279,20 @@ public:
for (unsigned i = 0, e = Abbv->getNumOperandInfos(); i != e; ++i) {
assert(RecordIdx < Vals.size() && "Invalid abbrev/record");
const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
unsigned RecordVal = Vals[RecordIdx];
if (Op.isLiteral()) {
// If the abbrev specifies the literal value to use, don't emit
// anything.
assert(RecordVal == Op.getLiteralValue() &&
"Invalid abbrev for record!");
if (Op.isLiteral() || Op.getEncoding() != BitCodeAbbrevOp::Array) {
EmitAbbreviatedField(Op, Vals[RecordIdx]);
++RecordIdx;
} else {
// Encode the value as we are commanded.
switch (Op.getEncoding()) {
default: assert(0 && "Unknown encoding!");
case BitCodeAbbrevOp::FixedWidth:
Emit(RecordVal, Op.getEncodingData());
++RecordIdx;
break;
case BitCodeAbbrevOp::VBR:
EmitVBR(RecordVal, Op.getEncodingData());
++RecordIdx;
break;
}
assert(i+2 == e && "array op not second to last?");
const BitCodeAbbrevOp &EltEnc = Abbv->getOperandInfo(++i);
// Emit a vbr6 to indicate the number of elements present.
EmitVBR(Vals.size()-RecordIdx, 6);
// Emit each field.
for (; RecordIdx != Vals.size(); ++RecordIdx)
EmitAbbreviatedField(EltEnc, Vals[RecordIdx]);
}
}
assert(RecordIdx == Vals.size() && "Not all record operands emitted!");