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[yaml2obj] Get rid of MachO header union

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This is based on post-commit feedback from Sean Silva.

llvm-svn: 271942
This commit is contained in:
Chris Bieneman 2016-06-06 21:18:43 +00:00
parent ca1c5f2e74
commit e0d16b563e
1 changed files with 6 additions and 11 deletions
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17
tools/yaml2obj/yaml2macho.cpp
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@ -31,8 +31,7 @@ public:
MachOWriter(MachOYAML::Object &Obj) : Obj(Obj), is64Bit(true), fileStart(0) {
is64Bit = Obj.Header.magic == MachO::MH_MAGIC_64 ||
Obj.Header.magic == MachO::MH_CIGAM_64;
memset(reinterpret_cast<void *>(&Header64), 0,
sizeof(MachO::mach_header_64));
memset(reinterpret_cast<void *>(&Header), 0, sizeof(MachO::mach_header_64));
assert((is64Bit || Obj.Header.reserved == 0xDEADBEEFu) &&
"32-bit MachO has reserved in header");
assert((!is64Bit || Obj.Header.reserved != 0xDEADBEEFu) &&
@ -64,10 +63,7 @@ private:
bool is64Bit;
uint64_t fileStart;
union {
MachO::mach_header_64 Header64;
MachO::mach_header Header;
};
MachO::mach_header_64 Header;
};
Error MachOWriter::writeMachO(raw_ostream &OS) {
@ -89,12 +85,11 @@ Error MachOWriter::writeHeader(raw_ostream &OS) {
Header.ncmds = Obj.Header.ncmds;
Header.sizeofcmds = Obj.Header.sizeofcmds;
Header.flags = Obj.Header.flags;
Header64.reserved = Obj.Header.reserved;
Header.reserved = Obj.Header.reserved;
if (is64Bit)
OS.write((const char *)&Header64, sizeof(MachO::mach_header_64));
else
OS.write((const char *)&Header, sizeof(MachO::mach_header));
auto header_size =
is64Bit ? sizeof(MachO::mach_header_64) : sizeof(MachO::mach_header);
OS.write((const char *)&Header, header_size);
return Error::success();
}