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Define the content-independent interfaces to read/write bitcode files and
the high-level interface to read/write LLVM IR bitcode files. This is a work in progress. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36329 91177308-0d34-0410-b5e6-96231b3b80d8
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include/llvm/Bitcode/BitCodes.h
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include/llvm/Bitcode/BitCodes.h
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//===- BitCodes.h - Enum values for the bitcode format ----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This header Bitcode enum values.
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//
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// The enum values defined in this file should be considered permanent. If
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// new features are added, they should have values added at the end of the
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// respective lists.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_BITCODE_BITCODES_H
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#define LLVM_BITCODE_BITCODES_H
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namespace llvm {
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namespace bitc {
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enum StandardWidths {
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BlockIDWidth = 8, // We use VBR-8 for block IDs.
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CodeLenWidth = 4, // Codelen are VBR-4.
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BlockSizeWidth = 32 // BlockSize up to 2^32 32-bit words = 32GB per block.
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};
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// The standard code namespace always has a way to exit a block, enter a
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// nested block, define abbrevs, and define an unabbreviated record.
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enum FixedCodes {
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END_BLOCK = 0, // Must be zero to guarantee termination for broken bitcode.
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ENTER_SUBBLOCK = 1,
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// Two codes are reserved for defining abbrevs and for emitting an
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// unabbreviated record.
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DEFINE_ABBREVS = 2,
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UNABBREV_RECORD = 3,
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// This is not a code, this is a marker for the first abbrev assignment.
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FIRST_ABBREV = 4
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};
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} // End bitc namespace
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} // End llvm namespace
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#endif
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include/llvm/Bitcode/BitstreamReader.h
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include/llvm/Bitcode/BitstreamReader.h
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//===- BitstreamReader.h - Low-level bitstream reader interface -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This header defines the BitstreamReader class. This class can be used to
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// read an arbitrary bitstream, regardless of its contents.
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//
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//===----------------------------------------------------------------------===//
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#ifndef BITSTREAM_READER_H
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#define BITSTREAM_READER_H
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#include "llvm/Bitcode/BitCodes.h"
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#include "llvm/ADT/SmallVector.h"
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#include <cassert>
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namespace llvm {
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class BitstreamReader {
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const unsigned char *NextChar;
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const unsigned char *LastChar;
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/// CurWord - This is the current data we have pulled from the stream but have
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/// not returned to the client.
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uint32_t CurWord;
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/// BitsInCurWord - This is the number of bits in CurWord that are valid. This
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/// is always from [0...31] inclusive.
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unsigned BitsInCurWord;
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// CurCodeSize - This is the declared size of code values used for the current
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// block, in bits.
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unsigned CurCodeSize;
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/// BlockScope - This tracks the codesize of parent blocks.
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SmallVector<unsigned, 8> BlockScope;
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public:
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BitstreamReader(const unsigned char *Start, const unsigned char *End)
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: NextChar(Start), LastChar(End) {
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assert(((End-Start) & 3) == 0 &&"Bitcode stream not a multiple of 4 bytes");
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CurWord = 0;
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BitsInCurWord = 0;
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CurCodeSize = 2;
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}
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bool AtEndOfStream() const { return NextChar == LastChar; }
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uint32_t Read(unsigned NumBits) {
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// If the field is fully contained by CurWord, return it quickly.
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if (BitsInCurWord >= NumBits) {
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uint32_t R = CurWord & ((1U << NumBits)-1);
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CurWord >>= NumBits;
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BitsInCurWord -= NumBits;
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return R;
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}
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// If we run out of data, stop at the end of the stream.
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if (LastChar == NextChar) {
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CurWord = 0;
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BitsInCurWord = 0;
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return 0;
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}
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unsigned R = CurWord;
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// Read the next word from the stream.
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CurWord = (NextChar[0] << 0) | (NextChar[1] << 8) |
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(NextChar[2] << 16) | (NextChar[3] << 24);
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NextChar += 4;
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// Extract NumBits-BitsInCurWord from what we just read.
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unsigned BitsLeft = NumBits-BitsInCurWord;
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// Be careful here, BitsLeft is in the range [1..32] inclusive.
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R |= (CurWord & (~0U >> (32-BitsLeft))) << BitsInCurWord;
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// BitsLeft bits have just been used up from CurWord.
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if (BitsLeft != 32)
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CurWord >>= BitsLeft;
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else
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CurWord = 0;
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BitsInCurWord = 32-BitsLeft;
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return R;
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}
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uint32_t ReadVBR(unsigned NumBits) {
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uint32_t Piece = Read(NumBits);
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if ((Piece & (1U << NumBits-1)) == 0)
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return Piece;
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uint32_t Result = 0;
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unsigned NextBit = 0;
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while (1) {
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Result |= (Piece & ((1U << (NumBits-1))-1)) << NextBit;
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if ((Piece & (1U << NumBits-1)) == 0)
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return Result;
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NextBit += NumBits-1;
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Piece = Read(NumBits);
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}
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}
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uint64_t ReadVBR64(unsigned NumBits) {
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uint64_t Piece = Read(NumBits);
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if ((Piece & (1U << NumBits-1)) == 0)
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return Piece;
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uint64_t Result = 0;
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unsigned NextBit = 0;
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while (1) {
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Result |= (Piece & ((1U << (NumBits-1))-1)) << NextBit;
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if ((Piece & (1U << NumBits-1)) == 0)
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return Result;
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NextBit += NumBits-1;
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Piece = Read(NumBits);
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}
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}
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void SkipToWord() {
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BitsInCurWord = 0;
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CurWord = 0;
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}
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unsigned ReadCode() {
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return Read(CurCodeSize);
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}
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//===--------------------------------------------------------------------===//
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// Block Manipulation
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//===--------------------------------------------------------------------===//
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// Block header:
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// [ENTER_SUBBLOCK, blockid, newcodelen, <align4bytes>, blocklen]
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/// ReadSubBlockID - Having read the ENTER_SUBBLOCK code, read the BlockID for
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/// the block.
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unsigned ReadSubBlockID() {
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return ReadVBR(bitc::BlockIDWidth);
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}
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/// SkipBlock - Having read the ENTER_SUBBLOCK abbrevid and a BlockID, skip
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/// over the body of this block. If the block record is malformed, return
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/// true.
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bool SkipBlock() {
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// Read and ignore the codelen value. Since we are skipping this block, we
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// don't care what code widths are used inside of it.
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ReadVBR(bitc::CodeLenWidth);
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SkipToWord();
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unsigned NumWords = Read(bitc::BlockSizeWidth);
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// Check that the block wasn't partially defined, and that the offset isn't
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// bogus.
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if (AtEndOfStream() || NextChar+NumWords*4 > LastChar)
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return true;
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NextChar += NumWords*4;
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return false;
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}
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/// EnterSubBlock - Having read the ENTER_SUBBLOCK abbrevid, read and enter
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/// the block, returning the BlockID of the block we just entered.
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bool EnterSubBlock() {
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BlockScope.push_back(CurCodeSize);
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// Get the codesize of this block.
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CurCodeSize = ReadVBR(bitc::CodeLenWidth);
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SkipToWord();
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unsigned NumWords = Read(bitc::BlockSizeWidth);
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// Validate that this block is sane.
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if (CurCodeSize == 0 || AtEndOfStream() || NextChar+NumWords*4 > LastChar)
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return true;
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return false;
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}
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bool ReadBlockEnd() {
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if (BlockScope.empty()) return true;
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// Block tail:
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// [END_BLOCK, <align4bytes>]
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SkipToWord();
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CurCodeSize = BlockScope.back();
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BlockScope.pop_back();
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return false;
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}
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//===--------------------------------------------------------------------===//
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// Record Processing
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//===--------------------------------------------------------------------===//
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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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unsigned NumElts = ReadVBR(6);
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for (unsigned i = 0; i != NumElts; ++i)
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Vals.push_back(ReadVBR64(6));
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return Code;
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}
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assert(0 && "Reading with abbrevs not implemented!");
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}
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};
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} // End llvm namespace
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#endif
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include/llvm/Bitcode/BitstreamWriter.h
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include/llvm/Bitcode/BitstreamWriter.h
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//===- BitstreamWriter.h - Low-level bitstream writer interface -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This header defines the BitstreamWriter class. This class can be used to
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// write an arbitrary bitstream, regardless of its contents.
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//
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//===----------------------------------------------------------------------===//
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#ifndef BITSTREAM_WRITER_H
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#define BITSTREAM_WRITER_H
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#include "llvm/Bitcode/BitCodes.h"
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#include "llvm/ADT/SmallVector.h"
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#include <cassert>
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#include <vector>
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namespace llvm {
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class BitstreamWriter {
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std::vector<unsigned char> &Out;
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/// CurBit - Always between 0 and 31 inclusive, specifies the next bit to use.
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unsigned CurBit;
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/// CurValue - The current value. Only bits < CurBit are valid.
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uint32_t CurValue;
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// CurCodeSize - This is the declared size of code values used for the current
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// block, in bits.
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unsigned CurCodeSize;
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struct Block {
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unsigned PrevCodeSize;
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unsigned StartSizeWord;
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Block(unsigned PCS, unsigned SSW) : PrevCodeSize(PCS), StartSizeWord(SSW) {}
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};
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/// BlockScope - This tracks the current blocks that we have entered.
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std::vector<Block> BlockScope;
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public:
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BitstreamWriter(std::vector<unsigned char> &O)
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: Out(O), CurBit(0), CurValue(0), CurCodeSize(2) {}
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~BitstreamWriter() {
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assert(CurBit == 0 && "Unflused data remaining");
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assert(BlockScope.empty() && "Block imbalance");
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}
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//===--------------------------------------------------------------------===//
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// Basic Primitives for emitting bits to the stream.
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//===--------------------------------------------------------------------===//
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void Emit(uint32_t Val, unsigned NumBits) {
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assert(NumBits <= 32 && "Invalid value size!");
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assert((Val & ~(~0U >> (32-NumBits))) == 0 && "High bits set!");
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CurValue |= Val << CurBit;
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if (CurBit + NumBits < 32) {
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CurBit += NumBits;
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return;
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}
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// Add the current word.
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unsigned V = CurValue;
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Out.push_back((unsigned char)(V >> 0));
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Out.push_back((unsigned char)(V >> 8));
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Out.push_back((unsigned char)(V >> 16));
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Out.push_back((unsigned char)(V >> 24));
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if (CurBit)
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CurValue = Val >> 32-CurBit;
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else
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CurValue = 0;
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CurBit = (CurBit+NumBits) & 31;
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}
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void Emit64(uint64_t Val, unsigned NumBits) {
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if (NumBits <= 32)
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Emit((uint32_t)Val, NumBits);
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else {
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Emit((uint32_t)Val, 32);
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Emit((uint32_t)(Val >> 32), NumBits-32);
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}
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}
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void FlushToWord() {
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if (CurBit) {
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unsigned V = CurValue;
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Out.push_back((unsigned char)(V >> 0));
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Out.push_back((unsigned char)(V >> 8));
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Out.push_back((unsigned char)(V >> 16));
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Out.push_back((unsigned char)(V >> 24));
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CurBit = 0;
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CurValue = 0;
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}
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}
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void EmitVBR(uint32_t Val, unsigned NumBits) {
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uint32_t Threshold = 1U << (NumBits-1);
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// Emit the bits with VBR encoding, NumBits-1 bits at a time.
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while (Val >= Threshold) {
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Emit((Val & ((1 << (NumBits-1))-1)) | (1 << (NumBits-1)), NumBits);
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Val >>= NumBits-1;
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}
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Emit(Val, NumBits);
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}
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void EmitVBR64(uint64_t Val, unsigned NumBits) {
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if ((uint32_t)Val == Val)
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return EmitVBR((uint32_t)Val, NumBits);
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uint64_t Threshold = 1U << (NumBits-1);
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// Emit the bits with VBR encoding, NumBits-1 bits at a time.
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while (Val >= Threshold) {
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Emit(((uint32_t)Val & ((1 << (NumBits-1))-1)) |
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(1 << (NumBits-1)), NumBits);
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Val >>= NumBits-1;
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}
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Emit((uint32_t)Val, NumBits);
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}
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/// EmitCode - Emit the specified code.
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void EmitCode(unsigned Val) {
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Emit(Val, CurCodeSize);
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}
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//===--------------------------------------------------------------------===//
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// Block Manipulation
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//===--------------------------------------------------------------------===//
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void EnterSubblock(unsigned BlockID, unsigned CodeLen) {
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// Block header:
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// [ENTER_SUBBLOCK, blockid, newcodelen, <align4bytes>, blocklen]
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EmitCode(bitc::ENTER_SUBBLOCK);
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EmitVBR(BlockID, bitc::BlockIDWidth);
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EmitVBR(CodeLen, bitc::CodeLenWidth);
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FlushToWord();
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BlockScope.push_back(Block(CurCodeSize, Out.size()/4));
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// Emit a placeholder, which will be replaced when the block is popped.
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Emit(0, bitc::BlockSizeWidth);
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CurCodeSize = CodeLen;
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}
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void ExitBlock() {
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assert(!BlockScope.empty() && "Block scope imbalance!");
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Block B = BlockScope.back();
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BlockScope.pop_back();
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// Block tail:
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// [END_BLOCK, <align4bytes>]
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EmitCode(bitc::END_BLOCK);
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FlushToWord();
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// Compute the size of the block, in words, not counting the size field.
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unsigned SizeInWords = Out.size()/4-B.StartSizeWord - 1;
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unsigned ByteNo = B.StartSizeWord*4;
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// Update the block size field in the header of this sub-block.
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Out[ByteNo++] = (unsigned char)(SizeInWords >> 0);
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Out[ByteNo++] = (unsigned char)(SizeInWords >> 8);
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||||
Out[ByteNo++] = (unsigned char)(SizeInWords >> 16);
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Out[ByteNo++] = (unsigned char)(SizeInWords >> 24);
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// Restore the outer block's code size.
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CurCodeSize = B.PrevCodeSize;
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}
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||||
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||||
//===--------------------------------------------------------------------===//
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// Record Emission
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//===--------------------------------------------------------------------===//
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||||
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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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unsigned Abbrev = 0) {
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if (Abbrev) {
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assert(0 && "abbrevs not implemented yet!");
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} else {
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// If we don't have an abbrev to use, emit this in its fully unabbreviated
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// form.
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EmitCode(bitc::UNABBREV_RECORD);
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EmitVBR(Code, 6);
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EmitVBR(Vals.size(), 6);
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for (unsigned i = 0, e = Vals.size(); i != e; ++i)
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EmitVBR64(Vals[i], 6);
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}
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||||
}
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||||
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||||
/// EmitRecord - Emit the specified record to the stream, using an abbrev if
|
||||
/// we have one to compress the output.
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||||
void EmitRecord(unsigned Code, SmallVectorImpl<unsigned> &Vals,
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unsigned Abbrev = 0) {
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if (Abbrev) {
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assert(0 && "abbrevs not implemented yet!");
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} else {
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||||
// If we don't have an abbrev to use, emit this in its fully unabbreviated
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// form.
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EmitCode(bitc::UNABBREV_RECORD);
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EmitVBR(Code, 6);
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EmitVBR(Vals.size(), 6);
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for (unsigned i = 0, e = Vals.size(); i != e; ++i)
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||||
EmitVBR(Vals[i], 6);
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||||
}
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||||
}
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||||
};
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||||
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||||
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} // End llvm namespace
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#endif
|
38
include/llvm/Bitcode/ReaderWriter.h
Normal file
38
include/llvm/Bitcode/ReaderWriter.h
Normal file
@ -0,0 +1,38 @@
|
||||
//===-- llvm/Bitcode/ReaderWriter.h - Bitcode reader/writers ----*- C++ -*-===//
|
||||
//
|
||||
// The LLVM Compiler Infrastructure
|
||||
//
|
||||
// This file was developed by Chris Lattner and is distributed under
|
||||
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
//
|
||||
// This header defines interfaces to read and write LLVM bitcode files/streams.
|
||||
//
|
||||
//===----------------------------------------------------------------------===//
|
||||
|
||||
#ifndef LLVM_BITCODE_H
|
||||
#define LLVM_BITCODE_H
|
||||
|
||||
#include <iosfwd>
|
||||
#include <string>
|
||||
|
||||
namespace llvm {
|
||||
class Module;
|
||||
class ModuleProvider;
|
||||
|
||||
ModuleProvider *getBitcodeModuleProvider(const std::string &Filename,
|
||||
std::string *ErrMsg = 0);
|
||||
|
||||
|
||||
/// ParseBitcodeFile - Read the specified bitcode file, returning the module.
|
||||
/// If an error occurs, return null and fill in *ErrMsg if non-null.
|
||||
Module *ParseBitcodeFile(const std::string &Filename,
|
||||
std::string *ErrMsg = 0);
|
||||
|
||||
/// WriteBitcodeToFile - Write the specified module to the specified output
|
||||
/// stream.
|
||||
void WriteBitcodeToFile(const Module *M, std::ostream &Out);
|
||||
} // End llvm namespace
|
||||
|
||||
#endif
|
Loading…
Reference in New Issue
Block a user