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[MC/Mach-O] Load commands are supposed to 8-byte aligned on 64-bit.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173120 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2013-01-22 03:42:49 +00:00
parent 7511aab27b
commit 849209686f
2 changed files with 17 additions and 8 deletions
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15
lib/MC/MachObjectWriter.cpp
View File

@ -377,25 +377,25 @@ void MachObjectWriter::WriteLinkeditLoadCommand(uint32_t Type,
}
static unsigned ComputeLinkerOptionsLoadCommandSize(
const std::vector<std::string> &Options)
const std::vector<std::string> &Options, bool is64Bit)
{
unsigned Size = sizeof(macho::LinkerOptionsLoadCommand);
for (unsigned i = 0, e = Options.size(); i != e; ++i)
Size += Options[i].size() + 1;
return RoundUpToAlignment(Size, 4);
return RoundUpToAlignment(Size, is64Bit ? 8 : 4);
}
void MachObjectWriter::WriteLinkerOptionsLoadCommand(
const std::vector<std::string> &Options)
{
unsigned Size = ComputeLinkerOptionsLoadCommandSize(Options);
unsigned Size = ComputeLinkerOptionsLoadCommandSize(Options, is64Bit());
uint64_t Start = OS.tell();
(void) Start;
Write32(macho::LCT_LinkerOptions);
Write32(Size);
Write32(Options.size());
uint64_t BytesWritten = 0;
uint64_t BytesWritten = sizeof(macho::LinkerOptionsLoadCommand);
for (unsigned i = 0, e = Options.size(); i != e; ++i) {
// Write each string, including the null byte.
const std::string &Option = Options[i];
@ -403,8 +403,8 @@ void MachObjectWriter::WriteLinkerOptionsLoadCommand(
BytesWritten += Option.size() + 1;
}
// Pad to a multiple of 4.
WriteBytes("", OffsetToAlignment(BytesWritten, 4));
// Pad to a multiple of the pointer size.
WriteBytes("", OffsetToAlignment(BytesWritten, is64Bit() ? 8 : 4));
assert(OS.tell() - Start == Size);
}
@ -747,7 +747,8 @@ void MachObjectWriter::WriteObject(MCAssembler &Asm,
Asm.getLinkerOptions();
for (unsigned i = 0, e = LinkerOptions.size(); i != e; ++i) {
++NumLoadCommands;
LoadCommandsSize += ComputeLinkerOptionsLoadCommandSize(LinkerOptions[i]);
LoadCommandsSize += ComputeLinkerOptionsLoadCommandSize(LinkerOptions[i],
is64Bit());
}
// Compute the total size of the section data, as well as its file size and vm

10
test/MC/MachO/linker-options.ll
View File

@ -24,12 +24,20 @@
; CHECK-OBJ: "-framework",
; CHECK-OBJ: "Cocoa",
; CHECK-OBJ: ])
; CHECK-OBJ: # Load Command 3
; CHECK-OBJ: (('command', 45)
; CHECK-OBJ: ('size', 24)
; CHECK-OBJ: ('count', 1)
; CHECK-OBJ: ('_strings', [
; CHECK-OBJ: "-lmath",
; CHECK-OBJ: ])
; CHECK-OBJ: ),
; CHECK-OBJ: ])
!0 = metadata !{ i32 6, metadata !"Linker Options",
metadata !{
metadata !{ metadata !"-lz" },
metadata !{ metadata !"-framework", metadata !"Cocoa" } } }
metadata !{ metadata !"-framework", metadata !"Cocoa" },
metadata !{ metadata !"-lmath" } } }
!llvm.module.flags = !{ !0 }