#ifndef LLVM_BITCODE_BITSTREAMWRITER_H
#define LLVM_BITCODE_BITSTREAMWRITER_H
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Bitcode/BitCodes.h"
};
std::vector<BlockInfo> BlockInfoRecords;
- // BackpatchWord - Backpatch a 32-bit word in the output with the specified
- // value.
- void BackpatchWord(unsigned ByteNo, unsigned NewWord) {
- support::endian::write32le(&Out[ByteNo], NewWord);
- }
-
void WriteByte(unsigned char Value) {
Out.push_back(Value);
}
/// \brief Retrieve the current position in the stream, in bits.
uint64_t GetCurrentBitNo() const { return GetBufferOffset() * 8 + CurBit; }
+ /// \brief Retrieve the number of bits currently used to encode an abbrev ID.
+ unsigned GetAbbrevIDWidth() const { return CurCodeSize; }
+
//===--------------------------------------------------------------------===//
// Basic Primitives for emitting bits to the stream.
//===--------------------------------------------------------------------===//
+ /// Backpatch a 32-bit word in the output at the given bit offset
+ /// with the specified value.
+ void BackpatchWord(uint64_t BitNo, unsigned NewWord) {
+ using namespace llvm::support;
+ unsigned ByteNo = BitNo / 8;
+ assert((!endian::readAtBitAlignment<uint32_t, little, unaligned>(
+ &Out[ByteNo], BitNo & 7)) &&
+ "Expected to be patching over 0-value placeholders");
+ endian::writeAtBitAlignment<uint32_t, little, unaligned>(
+ &Out[ByteNo], NewWord, BitNo & 7);
+ }
+
void Emit(uint32_t Val, unsigned NumBits) {
assert(NumBits && NumBits <= 32 && "Invalid value size!");
assert((Val & ~(~0U >> (32-NumBits))) == 0 && "High bits set!");
// Compute the size of the block, in words, not counting the size field.
unsigned SizeInWords = GetWordIndex() - B.StartSizeWord - 1;
- unsigned ByteNo = B.StartSizeWord*4;
+ uint64_t BitNo = B.StartSizeWord * 32;
// Update the block size field in the header of this sub-block.
- BackpatchWord(ByteNo, SizeInWords);
+ BackpatchWord(BitNo, SizeInWords);
// Restore the inner block's code size and abbrev table.
CurCodeSize = B.PrevCodeSize;
/// 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
- /// known to exist at the end of the record.
- template<typename uintty>
- void EmitRecordWithAbbrevImpl(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
- StringRef Blob) {
+ /// known to exist at the end of the record. If Code is specified, then
+ /// it is the record code to emit before the Vals, which must not contain
+ /// the code.
+ template <typename uintty>
+ void EmitRecordWithAbbrevImpl(unsigned Abbrev, ArrayRef<uintty> Vals,
+ StringRef Blob, Optional<unsigned> Code) {
const char *BlobData = Blob.data();
unsigned BlobLen = (unsigned) Blob.size();
unsigned AbbrevNo = Abbrev-bitc::FIRST_APPLICATION_ABBREV;
EmitCode(Abbrev);
+ unsigned i = 0, e = static_cast<unsigned>(Abbv->getNumOperandInfos());
+ if (Code) {
+ assert(e && "Expected non-empty abbreviation");
+ const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i++);
+
+ if (Op.isLiteral())
+ EmitAbbreviatedLiteral(Op, Code.getValue());
+ else {
+ assert(Op.getEncoding() != BitCodeAbbrevOp::Array &&
+ Op.getEncoding() != BitCodeAbbrevOp::Blob &&
+ "Expected literal or scalar");
+ EmitAbbreviatedField(Op, Code.getValue());
+ }
+ }
+
unsigned RecordIdx = 0;
- for (unsigned i = 0, e = static_cast<unsigned>(Abbv->getNumOperandInfos());
- i != e; ++i) {
+ for (; i != e; ++i) {
const BitCodeAbbrevOp &Op = Abbv->getOperandInfo(i);
if (Op.isLiteral()) {
assert(RecordIdx < Vals.size() && "Invalid abbrev/record");
++RecordIdx;
} else if (Op.getEncoding() == BitCodeAbbrevOp::Array) {
// Array case.
- assert(i+2 == e && "array op not second to last?");
+ assert(i + 2 == e && "array op not second to last?");
const BitCodeAbbrevOp &EltEnc = Abbv->getOperandInfo(++i);
// If this record has blob data, emit it, otherwise we must have record
/// EmitRecord - Emit the specified record to the stream, using an abbrev if
/// we have one to compress the output.
- template<typename uintty>
- void EmitRecord(unsigned Code, SmallVectorImpl<uintty> &Vals,
- unsigned Abbrev = 0) {
+ template <typename Container>
+ void EmitRecord(unsigned Code, const Container &Vals, unsigned Abbrev = 0) {
if (!Abbrev) {
// If we don't have an abbrev to use, emit this in its fully unabbreviated
// form.
+ auto Count = static_cast<uint32_t>(makeArrayRef(Vals).size());
EmitCode(bitc::UNABBREV_RECORD);
EmitVBR(Code, 6);
- EmitVBR(static_cast<uint32_t>(Vals.size()), 6);
- for (unsigned i = 0, e = static_cast<unsigned>(Vals.size()); i != e; ++i)
+ EmitVBR(Count, 6);
+ for (unsigned i = 0, e = Count; i != e; ++i)
EmitVBR64(Vals[i], 6);
return;
}
- // Insert the code into Vals to treat it uniformly.
- Vals.insert(Vals.begin(), Code);
-
- EmitRecordWithAbbrev(Abbrev, Vals);
+ EmitRecordWithAbbrevImpl(Abbrev, makeArrayRef(Vals), StringRef(), Code);
}
/// EmitRecordWithAbbrev - Emit a record with the specified abbreviation.
/// Unlike EmitRecord, the code for the record should be included in Vals as
/// the first entry.
- template<typename uintty>
- void EmitRecordWithAbbrev(unsigned Abbrev, SmallVectorImpl<uintty> &Vals) {
- EmitRecordWithAbbrevImpl(Abbrev, Vals, StringRef());
+ template <typename Container>
+ void EmitRecordWithAbbrev(unsigned Abbrev, const Container &Vals) {
+ EmitRecordWithAbbrevImpl(Abbrev, makeArrayRef(Vals), StringRef(), None);
}
/// EmitRecordWithBlob - Emit the specified record to the stream, using an
/// specified by the pointer and length specified at the end. In contrast to
/// EmitRecord, this routine expects that the first entry in Vals is the code
/// of the record.
- template<typename uintty>
- void EmitRecordWithBlob(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
+ template <typename Container>
+ void EmitRecordWithBlob(unsigned Abbrev, const Container &Vals,
StringRef Blob) {
- EmitRecordWithAbbrevImpl(Abbrev, Vals, Blob);
+ EmitRecordWithAbbrevImpl(Abbrev, makeArrayRef(Vals), Blob, None);
}
- template<typename uintty>
- void EmitRecordWithBlob(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
+ template <typename Container>
+ void EmitRecordWithBlob(unsigned Abbrev, const Container &Vals,
const char *BlobData, unsigned BlobLen) {
- return EmitRecordWithAbbrevImpl(Abbrev, Vals, StringRef(BlobData, BlobLen));
+ return EmitRecordWithAbbrevImpl(Abbrev, makeArrayRef(Vals),
+ StringRef(BlobData, BlobLen), None);
}
/// EmitRecordWithArray - Just like EmitRecordWithBlob, works with records
/// that end with an array.
- template<typename uintty>
- void EmitRecordWithArray(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
- StringRef Array) {
- EmitRecordWithAbbrevImpl(Abbrev, Vals, Array);
+ template <typename Container>
+ void EmitRecordWithArray(unsigned Abbrev, const Container &Vals,
+ StringRef Array) {
+ EmitRecordWithAbbrevImpl(Abbrev, makeArrayRef(Vals), Array, None);
}
- template<typename uintty>
- void EmitRecordWithArray(unsigned Abbrev, SmallVectorImpl<uintty> &Vals,
- const char *ArrayData, unsigned ArrayLen) {
- return EmitRecordWithAbbrevImpl(Abbrev, Vals, StringRef(ArrayData,
- ArrayLen));
+ template <typename Container>
+ void EmitRecordWithArray(unsigned Abbrev, const Container &Vals,
+ const char *ArrayData, unsigned ArrayLen) {
+ return EmitRecordWithAbbrevImpl(Abbrev, makeArrayRef(Vals),
+ StringRef(ArrayData, ArrayLen), None);
}
//===--------------------------------------------------------------------===//
projects / oota-llvm.git / blobdiff