MachO: direct-to-object attribute for data-in-code markers.

The target backend can support data-in-code load commands even when
the assembler doesn't, or vice-versa. Allow targets to opt-in for
direct-to-object.

PR13973.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164974 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 9 insertions, 6 deletions

diff --git a/lib/MC/MCAsmBackend.cpp b/lib/MC/MCAsmBackend.cpp
index 2e447b0..53960e7 100644
--- a/lib/MC/MCAsmBackend.cpp
+++ b/lib/MC/MCAsmBackend.cpp
@@ -12,12 +12,9 @@
 using namespace llvm;
 
 MCAsmBackend::MCAsmBackend()
-  : HasReliableSymbolDifference(false)
-{
-}
+  : HasReliableSymbolDifference(false), HasDataInCodeSupport(false) {}
 
-MCAsmBackend::~MCAsmBackend() {
-}
+MCAsmBackend::~MCAsmBackend() {}
 
 const MCFixupKindInfo &
 MCAsmBackend::getFixupKindInfo(MCFixupKind Kind) const {
diff --git a/lib/MC/MCMachOStreamer.cpp b/lib/MC/MCMachOStreamer.cpp
index 74f6dc6..b152a8c 100644
--- a/lib/MC/MCMachOStreamer.cpp
+++ b/lib/MC/MCMachOStreamer.cpp
@@ -139,6 +139,8 @@ void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
 }
 
 void MCMachOStreamer::EmitDataRegion(DataRegionData::KindTy Kind) {
+  if (!getAssembler().getBackend().hasDataInCodeSupport())
+    return;
   // Create a temporary label to mark the start of the data region.
   MCSymbol *Start = getContext().CreateTempSymbol();
   EmitLabel(Start);
@@ -149,6 +151,8 @@ void MCMachOStreamer::EmitDataRegion(DataRegionData::KindTy Kind) {
 }
 
 void MCMachOStreamer::EmitDataRegionEnd() {
+  if (!getAssembler().getBackend().hasDataInCodeSupport())
+    return;
   std::vector<DataRegionData> &Regions = getAssembler().getDataRegions();
   assert(Regions.size() && "Mismatched .end_data_region!");
   DataRegionData &Data = Regions.back();
diff --git a/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp b/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
index b032978..1ba6ab0 100644
--- a/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
+++ b/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
@@ -593,7 +593,9 @@ public:
   const object::mach::CPUSubtypeARM Subtype;
   DarwinARMAsmBackend(const Target &T, const StringRef TT,
                       object::mach::CPUSubtypeARM st)
-    : ARMAsmBackend(T, TT), Subtype(st) { }
+    : ARMAsmBackend(T, TT), Subtype(st) {
+      HasDataInCodeSupport = true;
+    }
 
   MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
     return createARMMachObjectWriter(OS, /*Is64Bit=*/false,