EHPreferredDataFormat hook for PPC targets. Looks like Darwin

uses the same encoding everywhere. Linux FIXME'ed.

llvm-svn: 47701

2 files changed, 30 insertions, 1 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCTargetAsmInfo.cpp b/llvm/lib/Target/PowerPC/PPCTargetAsmInfo.cpp
index 8728def217c..34ea8c37e96 100644
--- a/llvm/lib/Target/PowerPC/PPCTargetAsmInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCTargetAsmInfo.cpp
@@ -14,7 +14,10 @@
 #include "PPCTargetAsmInfo.h"
 #include "PPCTargetMachine.h"
 #include "llvm/Function.h"
+#include "llvm/Support/Dwarf.h"
+
 using namespace llvm;
+using namespace llvm::dwarf;
 
 PPCTargetAsmInfo::PPCTargetAsmInfo(const PPCTargetMachine &TM) {
   bool isPPC64 = TM.getSubtargetImpl()->isPPC64();
@@ -27,7 +30,6 @@ PPCTargetAsmInfo::PPCTargetAsmInfo(const PPCTargetMachine &TM) {
   InlineAsmStart = "# InlineAsm Start";
   InlineAsmEnd = "# InlineAsm End";
   AssemblerDialect = TM.getSubtargetImpl()->getAsmFlavor();
-  
 }
 
 DarwinTargetAsmInfo::DarwinTargetAsmInfo(const PPCTargetMachine &TM)
@@ -86,6 +88,21 @@ DarwinTargetAsmInfo::DarwinTargetAsmInfo(const PPCTargetMachine &TM)
   }
 }
 
+/// PreferredEHDataFormat - This hook allows the target to select data
+/// format used for encoding pointers in exception handling data. Reason is
+/// 0 for data, 1 for code labels, 2 for function pointers. Global is true
+/// if the symbol can be relocated.
+unsigned DarwinTargetAsmInfo::PreferredEHDataFormat(unsigned Reason,
+                                                    bool Global) const {
+  if (Reason == 2 && Global)
+    return (DW_EH_PE_pcrel | DW_EH_PE_indirect | DW_EH_PE_sdata4);
+  else if (Reason == 1 || !Global)
+    return DW_EH_PE_pcrel;
+  else
+    return DW_EH_PE_absptr;
+}
+
+
 LinuxTargetAsmInfo::LinuxTargetAsmInfo(const PPCTargetMachine &TM)
 : PPCTargetAsmInfo(TM)
 {
@@ -132,3 +149,13 @@ LinuxTargetAsmInfo::LinuxTargetAsmInfo(const PPCTargetMachine &TM)
   DwarfEHFrameSection = "\t.section\t.eh_frame,\"aw\",@progbits";
   DwarfExceptionSection = "\t.section\t.gcc_except_table,\"a\",@progbits";
 }
+
+/// PreferredEHDataFormat - This hook allows the target to select data
+/// format used for encoding pointers in exception handling data. Reason is
+/// 0 for data, 1 for code labels, 2 for function pointers. Global is true
+/// if the symbol can be relocated.
+unsigned LinuxTargetAsmInfo::PreferredEHDataFormat(unsigned Reason,
+                                                   bool Global) const {
+  // We really need to write something here.
+  return TargetAsmInfo::PreferredEHDataFormat(Reason, Global);
+}
diff --git a/llvm/lib/Target/PowerPC/PPCTargetAsmInfo.h b/llvm/lib/Target/PowerPC/PPCTargetAsmInfo.h
index 92cb3e7112d..c13063c812b 100644
--- a/llvm/lib/Target/PowerPC/PPCTargetAsmInfo.h
+++ b/llvm/lib/Target/PowerPC/PPCTargetAsmInfo.h
@@ -27,10 +27,12 @@ namespace llvm {
 
   struct DarwinTargetAsmInfo : public PPCTargetAsmInfo {
     explicit DarwinTargetAsmInfo(const PPCTargetMachine &TM);
+    virtual unsigned PreferredEHDataFormat(unsigned Reason, bool Global) const;
   };
 
   struct LinuxTargetAsmInfo : public PPCTargetAsmInfo {
     explicit LinuxTargetAsmInfo(const PPCTargetMachine &TM);
+    virtual unsigned PreferredEHDataFormat(unsigned Reason, bool Global) const;
   };
 
 } // namespace llvm