//
//===----------------------------------------------------------------------===//
-#ifndef BITSTREAM_WRITER_H
-#define BITSTREAM_WRITER_H
+#ifndef LLVM_BITCODE_BITSTREAMWRITER_H
+#define LLVM_BITCODE_BITSTREAMWRITER_H
+#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Bitcode/BitCodes.h"
#include <vector>
namespace llvm {
class BitstreamWriter {
- std::vector<unsigned char> &Out;
+ SmallVectorImpl<char> &Out;
/// CurBit - Always between 0 and 31 inclusive, specifies the next bit to use.
unsigned CurBit;
}
void WriteWord(unsigned Value) {
- Out.push_back((unsigned char)(Value >> 0));
- Out.push_back((unsigned char)(Value >> 8));
- Out.push_back((unsigned char)(Value >> 16));
- Out.push_back((unsigned char)(Value >> 24));
+ unsigned char Bytes[4] = {
+ (unsigned char)(Value >> 0),
+ (unsigned char)(Value >> 8),
+ (unsigned char)(Value >> 16),
+ (unsigned char)(Value >> 24) };
+ Out.append(&Bytes[0], &Bytes[4]);
}
unsigned GetBufferOffset() const {
}
public:
- explicit BitstreamWriter(std::vector<unsigned char> &O)
+ explicit BitstreamWriter(SmallVectorImpl<char> &O)
: Out(O), CurBit(0), CurValue(0), CurCodeSize(2) {}
~BitstreamWriter() {
}
void EmitVBR(uint32_t Val, unsigned NumBits) {
+ assert(NumBits <= 32 && "Too many bits to emit!");
uint32_t Threshold = 1U << (NumBits-1);
// Emit the bits with VBR encoding, NumBits-1 bits at a time.
}
void EmitVBR64(uint64_t Val, unsigned NumBits) {
+ assert(NumBits <= 32 && "Too many bits to emit!");
if ((uint32_t)Val == Val)
return EmitVBR((uint32_t)Val, NumBits);
- uint64_t Threshold = 1U << (NumBits-1);
+ uint32_t Threshold = 1U << (NumBits-1);
// Emit the bits with VBR encoding, NumBits-1 bits at a time.
while (Val >= Threshold) {
private:
/// EmitAbbreviatedLiteral - Emit a literal value according to its abbrev
- /// record. This is a no-op, since the abbrev specifies the literal to use.
+ /// record. This is a no-op, since the abbrev specifies the literal to use.
template<typename uintty>
void EmitAbbreviatedLiteral(const BitCodeAbbrevOp &Op, uintty V) {
assert(Op.isLiteral() && "Not a literal");
assert(V == Op.getLiteralValue() &&
"Invalid abbrev for record!");
}
-
+
/// EmitAbbreviatedField - Emit a single scalar field value with the specified
/// encoding.
template<typename uintty>
void EmitAbbreviatedField(const BitCodeAbbrevOp &Op, uintty V) {
assert(!Op.isLiteral() && "Literals should use EmitAbbreviatedLiteral!");
-
+
// Encode the value as we are commanded.
switch (Op.getEncoding()) {
default: llvm_unreachable("Unknown encoding!");
break;
}
}
-
+
/// EmitRecordWithAbbrevImpl - This is the core implementation of the record
/// emission code. If BlobData is non-null, then it specifies an array of
/// data that should be emitted as part of the Blob or Array operand that is
"Blob data and record entries specified for array!");
// Emit a vbr6 to indicate the number of elements present.
EmitVBR(static_cast<uint32_t>(BlobLen), 6);
-
+
// Emit each field.
for (unsigned i = 0; i != BlobLen; ++i)
EmitAbbreviatedField(EltEnc, (unsigned char)BlobData[i]);
-
+
// Know that blob data is consumed for assertion below.
BlobData = 0;
} else {
} else if (Op.getEncoding() == BitCodeAbbrevOp::Blob) {
// If this record has blob data, emit it, otherwise we must have record
// entries to encode this way.
-
+
// Emit a vbr6 to indicate the number of elements present.
if (BlobData) {
EmitVBR(static_cast<uint32_t>(BlobLen), 6);
} else {
EmitVBR(static_cast<uint32_t>(Vals.size()-RecordIdx), 6);
}
-
+
// Flush to a 32-bit alignment boundary.
FlushToWord();
if (BlobData) {
for (unsigned i = 0; i != BlobLen; ++i)
WriteByte((unsigned char)BlobData[i]);
-
+
// Know that blob data is consumed for assertion below.
BlobData = 0;
} else {
assert(BlobData == 0 &&
"Blob data specified for record that doesn't use it!");
}
-
+
public:
/// EmitRecord - Emit the specified record to the stream, using an abbrev if
// Insert the code into Vals to treat it uniformly.
Vals.insert(Vals.begin(), Code);
-
+
EmitRecordWithAbbrev(Abbrev, Vals);
}
-
+
/// EmitRecordWithAbbrev - Emit a record with the specified abbreviation.
/// Unlike EmitRecord, the code for the record should be included in Vals as
/// the first entry.
void EmitRecordWithAbbrev(unsigned Abbrev, SmallVectorImpl<uintty> &Vals) {
EmitRecordWithAbbrevImpl(Abbrev, Vals, StringRef());
}
-
+
/// EmitRecordWithBlob - Emit the specified record to the stream, using an
/// abbrev that includes a blob at the end. The blob data to emit is
/// specified by the pointer and length specified at the end. In contrast to
return EmitRecordWithAbbrevImpl(Abbrev, Vals, StringRef(ArrayData,
ArrayLen));
}
-
+
//===--------------------------------------------------------------------===//
// Abbrev Emission
//===--------------------------------------------------------------------===//
/// EnterBlockInfoBlock - Start emitting the BLOCKINFO_BLOCK.
void EnterBlockInfoBlock(unsigned CodeWidth) {
EnterSubblock(bitc::BLOCKINFO_BLOCK_ID, CodeWidth);
- BlockInfoCurBID = -1U;
+ BlockInfoCurBID = ~0U;
}
private:
/// SwitchToBlockID - If we aren't already talking about the specified block
projects / oota-llvm.git / blobdiff