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add support for array abbreviations.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36754 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -84,13 +84,15 @@ class BitCodeAbbrevOp {
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unsigned Enc : 3; // The encoding to use.
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public:
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enum Encoding {
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FixedWidth = 1, // A fixed with field, Val specifies number of bits.
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VBR = 2 // A VBR field where Val specifies the width of each chunk.
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Fixed = 1, // A fixed with field, Val specifies number of bits.
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VBR = 2, // A VBR field where Val specifies the width of each chunk.
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Array = 3 // A sequence of fields, next field species elt encoding.
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};
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BitCodeAbbrevOp(uint64_t V) : Val(V), IsLiteral(true) {}
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BitCodeAbbrevOp(Encoding E, uint64_t Data)
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BitCodeAbbrevOp(Encoding E, uint64_t Data = 0)
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: Val(Data), IsLiteral(false), Enc(E) {}
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bool isLiteral() const { return IsLiteral; }
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bool isEncoding() const { return !IsLiteral; }
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@ -100,11 +102,21 @@ public:
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// Accessors for encoding info.
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Encoding getEncoding() const { assert(isEncoding()); return (Encoding)Enc; }
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uint64_t getEncodingData() const { assert(isEncoding()); return Val; }
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uint64_t getEncodingData() const {
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assert(isEncoding() && hasEncodingData());
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return Val;
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}
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bool hasEncodingData() const { return hasEncodingData(getEncoding()); }
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static bool hasEncodingData(Encoding E) {
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return true;
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switch (E) {
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default: assert(0 && "Unknown encoding");
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case Fixed:
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case VBR:
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return true;
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case Array:
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return false;
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}
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}
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};
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@ -274,6 +274,26 @@ public:
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// Record Processing
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//===--------------------------------------------------------------------===//
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private:
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void ReadAbbreviatedField(const BitCodeAbbrevOp &Op,
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SmallVectorImpl<uint64_t> &Vals) {
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if (Op.isLiteral()) {
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// If the abbrev specifies the literal value to use, use it.
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Vals.push_back(Op.getLiteralValue());
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} else {
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// Decode the value as we are commanded.
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switch (Op.getEncoding()) {
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default: assert(0 && "Unknown encoding!");
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case BitCodeAbbrevOp::Fixed:
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Vals.push_back(Read(Op.getEncodingData()));
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break;
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case BitCodeAbbrevOp::VBR:
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Vals.push_back(ReadVBR64(Op.getEncodingData()));
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break;
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}
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}
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}
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public:
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unsigned ReadRecord(unsigned AbbrevID, SmallVectorImpl<uint64_t> &Vals) {
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if (AbbrevID == bitc::UNABBREV_RECORD) {
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unsigned Code = ReadVBR(6);
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@ -289,20 +309,19 @@ public:
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for (unsigned i = 0, e = Abbv->getNumOperandInfos(); i != e; ++i) {
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const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
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if (Op.isLiteral()) {
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// If the abbrev specifies the literal value to use, use it.
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Vals.push_back(Op.getLiteralValue());
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if (Op.isLiteral() || Op.getEncoding() != BitCodeAbbrevOp::Array) {
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ReadAbbreviatedField(Op, Vals);
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} else {
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// Decode the value as we are commanded.
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switch (Op.getEncoding()) {
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default: assert(0 && "Unknown encoding!");
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case BitCodeAbbrevOp::FixedWidth:
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Vals.push_back(Read(Op.getEncodingData()));
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break;
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case BitCodeAbbrevOp::VBR:
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Vals.push_back(ReadVBR64(Op.getEncodingData()));
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break;
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}
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// Array case. Read the number of elements as a vbr6.
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unsigned NumElts = ReadVBR(6);
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// Get the element encoding.
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assert(i+2 == e && "array op not second to last?");
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const BitCodeAbbrevOp &EltEnc = Abbv->getOperandInfo(++i);
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// Read all the elements.
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for (; NumElts; --NumElts)
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ReadAbbreviatedField(EltEnc, Vals);
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}
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}
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@ -326,11 +345,10 @@ public:
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}
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BitCodeAbbrevOp::Encoding E = (BitCodeAbbrevOp::Encoding)Read(3);
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if (BitCodeAbbrevOp::hasEncodingData(E)) {
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if (BitCodeAbbrevOp::hasEncodingData(E))
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Abbv->Add(BitCodeAbbrevOp(E, ReadVBR64(5)));
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} else {
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assert(0 && "unimp");
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}
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else
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Abbv->Add(BitCodeAbbrevOp(E));
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}
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CurAbbrevs.push_back(Abbv);
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}
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@ -189,6 +189,32 @@ public:
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// Record Emission
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//===--------------------------------------------------------------------===//
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private:
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/// EmitAbbreviatedField - Emit a single scalar field value with the specified
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/// encoding.
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template<typename uintty>
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void EmitAbbreviatedField(const BitCodeAbbrevOp &Op, uintty V) {
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if (Op.isLiteral()) {
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// If the abbrev specifies the literal value to use, don't emit
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// anything.
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assert(V == Op.getLiteralValue() &&
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"Invalid abbrev for record!");
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return;
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}
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// Encode the value as we are commanded.
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switch (Op.getEncoding()) {
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default: assert(0 && "Unknown encoding!");
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case BitCodeAbbrevOp::Fixed:
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Emit(V, Op.getEncodingData());
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break;
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case BitCodeAbbrevOp::VBR:
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EmitVBR(V, Op.getEncodingData());
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break;
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}
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}
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public:
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/// EmitRecord - Emit the specified record to the stream, using an abbrev if
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/// we have one to compress the output.
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void EmitRecord(unsigned Code, SmallVectorImpl<uint64_t> &Vals,
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@ -207,27 +233,20 @@ public:
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for (unsigned i = 0, e = Abbv->getNumOperandInfos(); i != e; ++i) {
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assert(RecordIdx < Vals.size() && "Invalid abbrev/record");
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const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
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uint64_t RecordVal = Vals[RecordIdx];
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if (Op.isLiteral()) {
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// If the abbrev specifies the literal value to use, don't emit
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// anything.
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assert(RecordVal == Op.getLiteralValue() &&
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"Invalid abbrev for record!");
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if (Op.isLiteral() || Op.getEncoding() != BitCodeAbbrevOp::Array) {
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EmitAbbreviatedField(Op, Vals[RecordIdx]);
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++RecordIdx;
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} else {
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// Encode the value as we are commanded.
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switch (Op.getEncoding()) {
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default: assert(0 && "Unknown encoding!");
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case BitCodeAbbrevOp::FixedWidth:
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Emit64(RecordVal, Op.getEncodingData());
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++RecordIdx;
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break;
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case BitCodeAbbrevOp::VBR:
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EmitVBR64(RecordVal, Op.getEncodingData());
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++RecordIdx;
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break;
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}
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// Array case.
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assert(i+2 == e && "array op not second to last?");
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const BitCodeAbbrevOp &EltEnc = Abbv->getOperandInfo(++i);
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// Emit a vbr6 to indicate the number of elements present.
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EmitVBR(Vals.size()-RecordIdx, 6);
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// Emit each field.
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for (; RecordIdx != Vals.size(); ++RecordIdx)
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EmitAbbreviatedField(EltEnc, Vals[RecordIdx]);
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}
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}
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assert(RecordIdx == Vals.size() && "Not all record operands emitted!");
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@ -260,27 +279,20 @@ public:
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for (unsigned i = 0, e = Abbv->getNumOperandInfos(); i != e; ++i) {
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assert(RecordIdx < Vals.size() && "Invalid abbrev/record");
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const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
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unsigned RecordVal = Vals[RecordIdx];
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if (Op.isLiteral()) {
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// If the abbrev specifies the literal value to use, don't emit
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// anything.
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assert(RecordVal == Op.getLiteralValue() &&
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"Invalid abbrev for record!");
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if (Op.isLiteral() || Op.getEncoding() != BitCodeAbbrevOp::Array) {
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EmitAbbreviatedField(Op, Vals[RecordIdx]);
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++RecordIdx;
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} else {
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// Encode the value as we are commanded.
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switch (Op.getEncoding()) {
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default: assert(0 && "Unknown encoding!");
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case BitCodeAbbrevOp::FixedWidth:
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Emit(RecordVal, Op.getEncodingData());
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++RecordIdx;
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break;
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case BitCodeAbbrevOp::VBR:
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EmitVBR(RecordVal, Op.getEncodingData());
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++RecordIdx;
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break;
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}
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assert(i+2 == e && "array op not second to last?");
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const BitCodeAbbrevOp &EltEnc = Abbv->getOperandInfo(++i);
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// Emit a vbr6 to indicate the number of elements present.
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EmitVBR(Vals.size()-RecordIdx, 6);
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// Emit each field.
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for (; RecordIdx != Vals.size(); ++RecordIdx)
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EmitAbbreviatedField(EltEnc, Vals[RecordIdx]);
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}
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}
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assert(RecordIdx == Vals.size() && "Not all record operands emitted!");
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