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author | Chris Lattner <sabre@nondot.org> | 2009-04-06 20:54:32 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2009-04-06 20:54:32 +0000 |
commit | e2a466bfa9e4f43c90602da5f602c16c2c83c866 (patch) | |
tree | a3066b35fb761605f2761533e9060b109850b5cd /lib/Bitcode | |
parent | 59d5f83b32753b3c9d5defa4d1374f7c9042eb46 (diff) | |
download | external_llvm-e2a466bfa9e4f43c90602da5f602c16c2c83c866.zip external_llvm-e2a466bfa9e4f43c90602da5f602c16c2c83c866.tar.gz external_llvm-e2a466bfa9e4f43c90602da5f602c16c2c83c866.tar.bz2 |
Teach llvm-bcanalyzer to skip over the header we use on LLVM IR files.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68458 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Bitcode')
-rw-r--r-- | lib/Bitcode/Reader/BitcodeReader.cpp | 47 |
1 files changed, 2 insertions, 45 deletions
diff --git a/lib/Bitcode/Reader/BitcodeReader.cpp b/lib/Bitcode/Reader/BitcodeReader.cpp index 66ccdc2..6f91dda 100644 --- a/lib/Bitcode/Reader/BitcodeReader.cpp +++ b/lib/Bitcode/Reader/BitcodeReader.cpp @@ -1330,48 +1330,6 @@ bool BitcodeReader::ParseModule(const std::string &ModuleID) { return Error("Premature end of bitstream"); } -/// SkipWrapperHeader - Some systems wrap bc files with a special header for -/// padding or other reasons. The format of this header is: -/// -/// struct bc_header { -/// uint32_t Magic; // 0x0B17C0DE -/// uint32_t Version; // Version, currently always 0. -/// uint32_t BitcodeOffset; // Offset to traditional bitcode file. -/// uint32_t BitcodeSize; // Size of traditional bitcode file. -/// ... potentially other gunk ... -/// }; -/// -/// This function is called when we find a file with a matching magic number. -/// In this case, skip down to the subsection of the file that is actually a BC -/// file. -static bool SkipWrapperHeader(unsigned char *&BufPtr, unsigned char *&BufEnd) { - enum { - KnownHeaderSize = 4*4, // Size of header we read. - OffsetField = 2*4, // Offset in bytes to Offset field. - SizeField = 3*4 // Offset in bytes to Size field. - }; - - - // Must contain the header! - if (BufEnd-BufPtr < KnownHeaderSize) return true; - - unsigned Offset = ( BufPtr[OffsetField ] | - (BufPtr[OffsetField+1] << 8) | - (BufPtr[OffsetField+2] << 16) | - (BufPtr[OffsetField+3] << 24)); - unsigned Size = ( BufPtr[SizeField ] | - (BufPtr[SizeField +1] << 8) | - (BufPtr[SizeField +2] << 16) | - (BufPtr[SizeField +3] << 24)); - - // Verify that Offset+Size fits in the file. - if (Offset+Size > unsigned(BufEnd-BufPtr)) - return true; - BufPtr += Offset; - BufEnd = BufPtr+Size; - return false; -} - bool BitcodeReader::ParseBitcode() { TheModule = 0; @@ -1383,9 +1341,8 @@ bool BitcodeReader::ParseBitcode() { // If we have a wrapper header, parse it and ignore the non-bc file contents. // The magic number is 0x0B17C0DE stored in little endian. - if (BufPtr != BufEnd && BufPtr[0] == 0xDE && BufPtr[1] == 0xC0 && - BufPtr[2] == 0x17 && BufPtr[3] == 0x0B) - if (SkipWrapperHeader(BufPtr, BufEnd)) + if (isBitcodeWrapper(BufPtr, BufEnd)) + if (SkipBitcodeWrapperHeader(BufPtr, BufEnd)) return Error("Invalid bitcode wrapper header"); Stream.init(BufPtr, BufEnd); |