From 03f2af79b84fab0858bb8d09e49293addb0fe601 Mon Sep 17 00:00:00 2001
From: Bill Wendling <isanbard@gmail.com>
Date: Mon, 29 Dec 2008 22:12:11 +0000
Subject: [PATCH] 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    | 8 ++++++++
 llvm/lib/CodeGen/AsmPrinter/DwarfWriter.cpp | 6 ++++--
 llvm/lib/Target/TargetAsmInfo.cpp           | 1 +
 llvm/lib/Target/X86/X86TargetAsmInfo.cpp    | 1 +
 4 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/llvm/include/llvm/Target/TargetAsmInfo.h b/llvm/include/llvm/Target/TargetAsmInfo.h
index aa9c14514c92..c880179038d7 100644
--- a/llvm/include/llvm/Target/TargetAsmInfo.h
+++ b/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;
     }
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfWriter.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
index 6534f401cc6a..691c922d0af3 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfWriter.cpp
+++ b/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
diff --git a/llvm/lib/Target/TargetAsmInfo.cpp b/llvm/lib/Target/TargetAsmInfo.cpp
index c9a525a506ed..5cf298aa95ba 100644
--- a/llvm/lib/Target/TargetAsmInfo.cpp
+++ b/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;
diff --git a/llvm/lib/Target/X86/X86TargetAsmInfo.cpp b/llvm/lib/Target/X86/X86TargetAsmInfo.cpp
index 4dfb214ec71f..de655e732b23 100644
--- a/llvm/lib/Target/X86/X86TargetAsmInfo.cpp
+++ b/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";