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Add a file magic for CL.exe's object file created with /GL.

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This patch makes it possible to identify object files created by CL.exe
with /GL option. Such file contains Microsoft proprietary intermediate
code instead of target machine code to do LTO.

I need this to print out user-friendly error message from LLD.

Differential Revision: https://reviews.llvm.org/D26645

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@286919 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rui Ueyama 2016-11-15 00:54:54 +00:00
parent 2c34688a06
commit baf920c9bc
4 changed files with 14 additions and 11 deletions
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5
include/llvm/Support/COFF.h
View File

@ -41,6 +41,11 @@ namespace COFF {
'\xaf', '\x20', '\xfa', '\xf6', '\x6a', '\xa4', '\xdc', '\xb8',
};
static const char ClGlObjMagic[] = {
'\x38', '\xfe', '\xb3', '\x0c', '\xa5', '\xd9', '\xab', '\x4d',
'\xac', '\x9b', '\xd6', '\xb6', '\x22', '\x26', '\x53', '\xc2',
};
// Sizes in bytes of various things in the COFF format.
enum {
Header16Size = 20,

1
include/llvm/Support/FileSystem.h
View File

@ -258,6 +258,7 @@ struct file_magic {
macho_dsym_companion, ///< Mach-O dSYM companion file
macho_kext_bundle, ///< Mach-O kext bundle file
macho_universal_binary, ///< Mach-O universal binary
coff_cl_gl_object, ///< Microsoft cl.exe's intermediate code file
coff_object, ///< COFF object file
coff_import_library, ///< COFF import library
pecoff_executable, ///< PECOFF executable file

1
lib/Object/ObjectFile.cpp
View File

@ -78,6 +78,7 @@ ObjectFile::createObjectFile(MemoryBufferRef Object, sys::fs::file_magic Type) {
switch (Type) {
case sys::fs::file_magic::unknown:
case sys::fs::file_magic::bitcode:
case sys::fs::file_magic::coff_cl_gl_object:
case sys::fs::file_magic::archive:
case sys::fs::file_magic::macho_universal_binary:
case sys::fs::file_magic::windows_resource:

18
lib/Support/Path.cpp
View File

@ -986,22 +986,18 @@ file_magic identify_magic(StringRef Magic) {
return file_magic::unknown;
switch ((unsigned char)Magic[0]) {
case 0x00: {
// COFF bigobj or short import library file
if (Magic[1] == (char)0x00 && Magic[2] == (char)0xff &&
Magic[3] == (char)0xff) {
// COFF bigobj, CL.exe's LTO object file, or short import library file
if (memcmp(Magic.data() + 1, "\0\xFF\xFF", 3) == 0) {
size_t MinSize = offsetof(COFF::BigObjHeader, UUID) + sizeof(COFF::BigObjMagic);
if (Magic.size() < MinSize)
return file_magic::coff_import_library;
int BigObjVersion = read16le(
Magic.data() + offsetof(COFF::BigObjHeader, Version));
if (BigObjVersion < COFF::BigObjHeader::MinBigObjectVersion)
return file_magic::coff_import_library;
const char *Start = Magic.data() + offsetof(COFF::BigObjHeader, UUID);
if (memcmp(Start, COFF::BigObjMagic, sizeof(COFF::BigObjMagic)) != 0)
return file_magic::coff_import_library;
return file_magic::coff_object;
if (memcmp(Start, COFF::BigObjMagic, sizeof(COFF::BigObjMagic)) == 0)
return file_magic::coff_object;
if (memcmp(Start, COFF::ClGlObjMagic, sizeof(COFF::BigObjMagic)) == 0)
return file_magic::coff_cl_gl_object;
return file_magic::coff_import_library;
}
// Windows resource file
const char Expected[] = { 0, 0, 0, 0, '\x20', 0, 0, 0, '\xff' };