6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-26 23:24:34 +00:00
Code Issues Projects Releases Wiki Activity

Add const qualifiers for isBitcodeWrapper, and add new functions

Browse Source 
isRawBitcode and isBitcode to allow clients to test whether a given
memory buffer holds a bitcode image.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80804 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-09-02 17:21:29 +00:00
parent 2ec5fe524c
commit c2ac2d5347
1 changed files with 36 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
include/llvm/Bitcode/ReaderWriter.h
View File

@ -53,12 +53,41 @@ namespace llvm {
ModulePass *createBitcodeWriterPass(raw_ostream &Str); ModulePass *createBitcodeWriterPass(raw_ostream &Str);
/// isBitcodeWrapper - Return true fi this is a wrapper for LLVM IR bitcode /// isBitcodeWrapper - Return true if the given bytes are the magic bytes
/// files. /// for an LLVM IR bitcode wrapper.
static bool inline isBitcodeWrapper(unsigned char *BufPtr, ///
unsigned char *BufEnd) { static inline bool isBitcodeWrapper(const unsigned char *BufPtr,
return (BufPtr != BufEnd && BufPtr[0] == 0xDE && BufPtr[1] == 0xC0 && const unsigned char *BufEnd) {
BufPtr[2] == 0x17 && BufPtr[3] == 0x0B); // 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 /// SkipBitcodeWrapperHeader - Some systems wrap bc files with a special