Add a flag that indicates whether a target supports compact unwind info or not.

llvm-svn: 133662

3 files changed, 15 insertions, 4 deletions

diff --git a/llvm/include/llvm/Target/TargetLoweringObjectFile.h b/llvm/include/llvm/Target/TargetLoweringObjectFile.h
index 12ea2a5756e..a3d1f372b43 100644
--- a/llvm/include/llvm/Target/TargetLoweringObjectFile.h
+++ b/llvm/include/llvm/Target/TargetLoweringObjectFile.h
@@ -107,8 +107,12 @@ protected:
   /// private linkage, aka an L or .L label) or false if it should be a normal
   /// non-.globl label.  This defaults to true.
   bool IsFunctionEHFrameSymbolPrivate;
+
+  /// SupportsCompactUnwindInfo - This flag is set to true if the CIE and FDE
+  /// information should be emitted in a compact form.
+  bool SupportsCompactUnwindInfo;
+
 public:
-  
   MCContext &getContext() const { return *Ctx; }
   
   virtual ~TargetLoweringObjectFile();
@@ -126,10 +130,12 @@ public:
   bool getSupportsWeakOmittedEHFrame() const {
     return SupportsWeakOmittedEHFrame;
   }
-  
   bool getCommDirectiveSupportsAlignment() const {
     return CommDirectiveSupportsAlignment;
   }
+  bool getSupportsCompactUnwindInfo() const {
+    return SupportsCompactUnwindInfo;
+  }
 
   const MCSection *getTextSection() const { return TextSection; }
   const MCSection *getDataSection() const { return DataSection; }
diff --git a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 3f346a35957..df42b2ca0b5 100644
--- a/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -487,8 +487,12 @@ void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx,
 
   // .comm doesn't support alignment before Leopard.
   Triple T(((LLVMTargetMachine&)TM).getTargetTriple());
-  if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
-    CommDirectiveSupportsAlignment = false;
+  if (T.isMacOSX()) {
+    if (T.isMacOSXVersionLT(10, 5))
+      CommDirectiveSupportsAlignment = false;
+    if (!T.isMacOSXVersionLT(10, 6))
+      SupportsCompactUnwindInfo = true;
+  }
 
   TargetLoweringObjectFile::Initialize(Ctx, TM);
 
diff --git a/llvm/lib/Target/TargetLoweringObjectFile.cpp b/llvm/lib/Target/TargetLoweringObjectFile.cpp
index 9f87c071643..130a553e292 100644
--- a/llvm/lib/Target/TargetLoweringObjectFile.cpp
+++ b/llvm/lib/Target/TargetLoweringObjectFile.cpp
@@ -61,6 +61,7 @@ TargetLoweringObjectFile::TargetLoweringObjectFile() : Ctx(0) {
   
   IsFunctionEHFrameSymbolPrivate = true;
   SupportsWeakOmittedEHFrame = true;
+  SupportsCompactUnwindInfo = false;
 }
 
 TargetLoweringObjectFile::~TargetLoweringObjectFile() {