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Add LC_BUILD_VERSION load command

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Summary:
Add a new load command LC_BUILD_VERSION. It is a generic version of
LC_*_VERSION_MIN load_command used on Apple platforms. Instead of having
a seperate load command for each platform, LC_BUILD_VERSION is recording
platform info as an enum. It also records SDK version, min_os, and tools
that used to build the binary.

rdar://problem/29781291

Reviewers: enderby

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D29044

llvm-svn: 292824
This commit is contained in:
Steven Wu
2017-01-23 20:07:55 +00:00
parent cddeb751a1
commit 5b54a42c0f
14 changed files with 407 additions and 1 deletions
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34
llvm/lib/Object/MachOObjectFile.cpp
View File

@@ -809,6 +809,27 @@ static Error checkNoteCommand(const MachOObjectFile &Obj,
return Error::success();
}
static Error
parseBuildVersionCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
SmallVectorImpl<const char*> &BuildTools,
uint32_t LoadCommandIndex) {
MachO::build_version_command BVC =
getStruct<MachO::build_version_command>(Obj, Load.Ptr);
if (Load.C.cmdsize !=
sizeof(MachO::build_version_command) +
BVC.ntools * sizeof(MachO::build_tool_version))
return malformedError("load command " + Twine(LoadCommandIndex) +
" LC_BUILD_VERSION_COMMAND has incorrect cmdsize");
auto Start = Load.Ptr + sizeof(MachO::build_version_command);
BuildTools.resize(BVC.ntools);
for (unsigned i = 0; i < BVC.ntools; ++i)
BuildTools[i] = Start + i * sizeof(MachO::build_tool_version);
return Error::success();
}
static Error checkRpathCommand(const MachOObjectFile &Obj,
const MachOObjectFile::LoadCommandInfo &Load,
uint32_t LoadCommandIndex) {
@@ -1308,6 +1329,9 @@ MachOObjectFile::MachOObjectFile(MemoryBufferRef Object, bool IsLittleEndian,
} else if (Load.C.cmd == MachO::LC_NOTE) {
if ((Err = checkNoteCommand(*this, Load, I, Elements)))
return;
} else if (Load.C.cmd == MachO::LC_BUILD_VERSION) {
if ((Err = parseBuildVersionCommand(*this, Load, BuildTools, I)))
return;
} else if (Load.C.cmd == MachO::LC_RPATH) {
if ((Err = checkRpathCommand(*this, Load, I)))
return;
@@ -3322,6 +3346,16 @@ MachOObjectFile::getNoteLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::note_command>(*this, L.Ptr);
}
MachO::build_version_command
MachOObjectFile::getBuildVersionLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::build_version_command>(*this, L.Ptr);
}
MachO::build_tool_version
MachOObjectFile::getBuildToolVersion(unsigned index) const {
return getStruct<MachO::build_tool_version>(*this, BuildTools[index]);
}
MachO::dylib_command
MachOObjectFile::getDylibIDLoadCommand(const LoadCommandInfo &L) const {
return getStruct<MachO::dylib_command>(*this, L.Ptr);