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Assorted bugfixes in object file handling:

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- Adds support for sniffing PE/COFF files on win32 (.exe and .dll)
   which are COFF files that have an MS-DOS compatibility stub on
   the front of them.

 - Fixes a bug in the COFFObjectFile's support for the Microsoft COFF
   extension for long symbol names, wherein it was attempting to parse
   the leading '/' in an extended symbol name reference as part of the
   integer offset.

 - Fixes bugs in COFFObjectFile and ELFObjectFile wherein section
   and symbol iterators were being returned with uninitialized bytes;
   the type DataRefImpl is a union between 2 32-bit words (d.a and d.b)
   and a single intptr_t word (p). Only p was being initialized, so in
   32-bit builds the result would be iterators with random upper 32-bit
   words in their DataRefImpls. This caused random failures when
   seeking around in object files.

Patch by Graydon Hoare!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128799 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher
2011-04-03 22:53:19 +00:00
parent e243fd9e2b
commit 539d8d8a72
3 changed files with 34 additions and 2 deletions
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14
lib/Support/Path.cpp
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@ -15,11 +15,15 @@
#include "llvm/Support/FileSystem.h"
#include "llvm/Config/config.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Endian.h"
#include <cassert>
#include <cstring>
#include <ostream>
using namespace llvm;
using namespace sys;
namespace {
using support::ulittle32_t;
}
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only TRULY operating system
@ -129,6 +133,16 @@ sys::IdentifyFileType(const char *magic, unsigned length) {
if (magic[1] == 0x02)
return COFF_FileType;
break;
case 0x4d: // Possible MS-DOS stub on Windows PE file
if (magic[1] == 0x5a) {
uint32_t off = *reinterpret_cast<const ulittle32_t *>(magic + 0x3c);
// PE/COFF file, either EXE or DLL.
if (off < length && memcmp(magic + off, "PE\0\0",4) == 0)
return COFF_FileType;
}
break;
case 0x64: // x86-64 Windows.
if (magic[1] == char(0x86))
return COFF_FileType;