diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/llvm/Bitcode/ReaderWriter.h | 43 |
1 files changed, 36 insertions, 7 deletions
diff --git a/include/llvm/Bitcode/ReaderWriter.h b/include/llvm/Bitcode/ReaderWriter.h index ef32239..7b74bdf 100644 --- a/include/llvm/Bitcode/ReaderWriter.h +++ b/include/llvm/Bitcode/ReaderWriter.h @@ -53,14 +53,43 @@ namespace llvm { ModulePass *createBitcodeWriterPass(raw_ostream &Str); - /// isBitcodeWrapper - Return true fi this is a wrapper for LLVM IR bitcode - /// files. - static bool inline isBitcodeWrapper(unsigned char *BufPtr, - unsigned char *BufEnd) { - return (BufPtr != BufEnd && BufPtr[0] == 0xDE && BufPtr[1] == 0xC0 && - BufPtr[2] == 0x17 && BufPtr[3] == 0x0B); + /// isBitcodeWrapper - Return true if the given bytes are the magic bytes + /// for an LLVM IR bitcode wrapper. + /// + static inline bool isBitcodeWrapper(const unsigned char *BufPtr, + const unsigned char *BufEnd) { + // See if you can find the hidden message in the magic bytes :-). + // (Hint: it's a little-endian encoding.) + return BufPtr != BufEnd && + BufPtr[0] == 0xDE && + BufPtr[1] == 0xC0 && + BufPtr[2] == 0x17 && + BufPtr[3] == 0x0B; } - + + /// isRawBitcode - Return true if the given bytes are the magic bytes for + /// raw LLVM IR bitcode (without a wrapper). + /// + static inline bool isRawBitcode(const unsigned char *BufPtr, + const unsigned char *BufEnd) { + // These bytes sort of have a hidden message, but it's not in + // little-endian this time, and it's a little redundant. + return BufPtr != BufEnd && + BufPtr[0] == 'B' && + BufPtr[1] == 'C' && + BufPtr[2] == 0xc0 && + BufPtr[3] == 0xde; + } + + /// isBitcode - Return true if the given bytes are the magic bytes for + /// LLVM IR bitcode, either with or without a wrapper. + /// + static bool inline isBitcode(const unsigned char *BufPtr, + const unsigned char *BufEnd) { + return isBitcodeWrapper(BufPtr, BufEnd) || + isRawBitcode(BufPtr, BufEnd); + } + /// SkipBitcodeWrapperHeader - Some systems wrap bc files with a special /// header for padding or other reasons. The format of this header is: /// |