[MC/Mach-O] Add support for linker options in Mach-O files.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172779 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCMachOStreamer.cpp b/lib/MC/MCMachOStreamer.cpp
index f947dda..2c0c97a 100644
--- a/lib/MC/MCMachOStreamer.cpp
+++ b/lib/MC/MCMachOStreamer.cpp
@@ -48,6 +48,7 @@
virtual void EmitEHSymAttributes(const MCSymbol *Symbol,
MCSymbol *EHSymbol);
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
+ virtual void EmitLinkerOptions(ArrayRef<std::string> Options);
virtual void EmitDataRegion(MCDataRegionType Kind);
virtual void EmitThumbFunc(MCSymbol *Func);
virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
@@ -178,6 +179,10 @@
}
}
+void MCMachOStreamer::EmitLinkerOptions(ArrayRef<std::string> Options) {
+ getAssembler().getLinkerOptions().push_back(Options);
+}
+
void MCMachOStreamer::EmitDataRegion(MCDataRegionType Kind) {
switch (Kind) {
case MCDR_DataRegion:
diff --git a/lib/MC/MachObjectWriter.cpp b/lib/MC/MachObjectWriter.cpp
index 0098bea..d13c178 100644
--- a/lib/MC/MachObjectWriter.cpp
+++ b/lib/MC/MachObjectWriter.cpp
@@ -376,6 +376,39 @@
assert(OS.tell() - Start == macho::LinkeditLoadCommandSize);
}
+static unsigned ComputeLinkerOptionsLoadCommandSize(
+ const std::vector<std::string> &Options)
+{
+ unsigned Size = sizeof(macho::LinkerOptionsLoadCommand);
+ for (unsigned i = 0, e = Options.size(); i != e; ++i)
+ Size += Options[i].size() + 1;
+ return RoundUpToAlignment(Size, 4);
+}
+
+void MachObjectWriter::WriteLinkerOptionsLoadCommand(
+ const std::vector<std::string> &Options)
+{
+ unsigned Size = ComputeLinkerOptionsLoadCommandSize(Options);
+ uint64_t Start = OS.tell();
+ (void) Start;
+
+ Write32(macho::LCT_LinkerOptions);
+ Write32(Size);
+ Write32(Options.size());
+ uint64_t BytesWritten = 0;
+ for (unsigned i = 0, e = Options.size(); i != e; ++i) {
+ // Write each string, including the null byte.
+ const std::string &Option = Options[i];
+ WriteBytes(Option.c_str(), Option.size() + 1);
+ BytesWritten += Option.size() + 1;
+ }
+
+ // Pad to a multiple of 4.
+ WriteBytes("", OffsetToAlignment(BytesWritten, 4));
+
+ assert(OS.tell() - Start == Size);
+}
+
void MachObjectWriter::RecordRelocation(const MCAssembler &Asm,
const MCAsmLayout &Layout,
@@ -693,6 +726,13 @@
macho::SegmentLoadCommand64Size + NumSections * macho::Section64Size :
macho::SegmentLoadCommand32Size + NumSections * macho::Section32Size;
+ // Add the data-in-code load command size, if used.
+ unsigned NumDataRegions = Asm.getDataRegions().size();
+ if (NumDataRegions) {
+ ++NumLoadCommands;
+ LoadCommandsSize += macho::LinkeditLoadCommandSize;
+ }
+
// Add the symbol table load command sizes, if used.
unsigned NumSymbols = LocalSymbolData.size() + ExternalSymbolData.size() +
UndefinedSymbolData.size();
@@ -702,13 +742,14 @@
macho::DysymtabLoadCommandSize);
}
- // Add the data-in-code load command size, if used.
- unsigned NumDataRegions = Asm.getDataRegions().size();
- if (NumDataRegions) {
+ // Add the linker option load commands sizes.
+ const std::vector<std::vector<std::string> > &LinkerOptions =
+ Asm.getLinkerOptions();
+ for (unsigned i = 0, e = LinkerOptions.size(); i != e; ++i) {
++NumLoadCommands;
- LoadCommandsSize += macho::LinkeditLoadCommandSize;
+ LoadCommandsSize += ComputeLinkerOptionsLoadCommandSize(LinkerOptions[i]);
}
-
+
// Compute the total size of the section data, as well as its file size and vm
// size.
uint64_t SectionDataStart = (is64Bit() ? macho::Header64Size :
@@ -799,6 +840,11 @@
IndirectSymbolOffset, NumIndirectSymbols);
}
+ // Write the linker options load commands.
+ for (unsigned i = 0, e = LinkerOptions.size(); i != e; ++i) {
+ WriteLinkerOptionsLoadCommand(LinkerOptions[i]);
+ }
+
// Write the actual section data.
for (MCAssembler::const_iterator it = Asm.begin(),
ie = Asm.end(); it != ie; ++it) {