Linux wants the FDE initial location and address range to be forced to 32-bit.

Darwin doesn't. Make this optional for platforms.

llvm-svn: 61484

llvm/include/llvm/Target/TargetAsmInfo.h

@@ -457,6 +457,11 @@ namespace llvm {
     /// 
     bool NonLocalEHFrameLabel;              // Defaults to false.
 
+    /// Force32BitFDEReference - Force the FDE initial location and address
+    /// range to be 32-bit sized.
+    ///
+    bool Force32BitFDEReference;            // Defaults to true.
+
     /// GlobalEHDirective - This is the directive used to make exception frame
     /// tables globally visible.
     ///
@@ -829,6 +834,9 @@ namespace llvm {
     bool doesRequireNonLocalEHFrameLabel() const {
       return NonLocalEHFrameLabel;
     }
+    bool doesRequire32BitFDEReference() const {
+      return Force32BitFDEReference;
+    }
     const char *getGlobalEHDirective() const {
       return GlobalEHDirective;
     }

llvm/lib/CodeGen/AsmPrinter/DwarfWriter.cpp

@@ -3119,10 +3119,12 @@ private:
 
       Asm->EOL("FDE CIE offset");
 
-      EmitReference("eh_func_begin", EHFrameInfo.Number, true);
+      EmitReference("eh_func_begin", EHFrameInfo.Number, true, 
+                    TAI->doesRequire32BitFDEReference());
       Asm->EOL("FDE initial location");
       EmitDifference("eh_func_end", EHFrameInfo.Number,
-                     "eh_func_begin", EHFrameInfo.Number);
+                     "eh_func_begin", EHFrameInfo.Number,
+                     TAI->doesRequire32BitFDEReference());
       Asm->EOL("FDE address range");
 
       // If there is a personality and landing pads then point to the language

llvm/lib/Target/TargetAsmInfo.cpp

@@ -101,6 +101,7 @@ void TargetAsmInfo::fillDefaultValues() {
   DwarfRequiresFrameSection = true;
   FDEEncodingRequiresSData4 = true;
   NonLocalEHFrameLabel = false;
+  Force32BitFDEReference = true;
   GlobalEHDirective = 0;
   SupportsWeakOmittedEHFrame = true;
   DwarfSectionOffsetDirective = 0;

llvm/lib/Target/X86/X86TargetAsmInfo.cpp

@@ -72,6 +72,7 @@ X86DarwinTargetAsmInfo::X86DarwinTargetAsmInfo(const X86TargetMachine &TM):
   HasSingleParameterDotFile = false;
   FDEEncodingRequiresSData4 = false;
   NonLocalEHFrameLabel = true;
+  Force32BitFDEReference = false;
   if (TM.getRelocationModel() == Reloc::Static) {
     StaticCtorsSection = ".constructor";
     StaticDtorsSection = ".destructor";