Fix .debug_range for linux. Patch by Krister Wombell.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112830 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 36 insertions, 4 deletions

diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 2571341..9078f28 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -1218,6 +1218,29 @@ void AsmPrinter::EmitLabelOffsetDifference(const MCSymbol *Hi, uint64_t Offset,
     OutStreamer.EmitSymbolValue(SetLabel, 4, 0/*AddrSpace*/);
   }
 }
+
+/// EmitLabelPlusOffset - Emit something like ".long Label+Offset" 
+/// where the size in bytes of the directive is specified by Size and Label
+/// specifies the label.  This implicitly uses .set if it is available.
+void AsmPrinter::EmitLabelPlusOffset(const MCSymbol *Label, uint64_t Offset,
+                                      unsigned Size) 
+  const {
+  
+  // Emit Label+Offset
+  const MCExpr *Plus =
+    MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Label, OutContext), 
+                            MCConstantExpr::Create(Offset, OutContext),
+                            OutContext);
+  
+  if (!MAI->hasSetDirective()) 
+    OutStreamer.EmitValue(Plus, 4, 0/*AddrSpace*/);
+  else {
+    // Otherwise, emit with .set (aka assignment).
+    MCSymbol *SetLabel = GetTempSymbol("set", SetCounter++);
+    OutStreamer.EmitAssignment(SetLabel, Plus);
+    OutStreamer.EmitSymbolValue(SetLabel, 4, 0/*AddrSpace*/);
+  }
+}
     
 
 //===----------------------------------------------------------------------===//
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 6edce5a..c886a5e 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -3130,10 +3130,17 @@ void DwarfDebug::emitDIE(DIE *Die) {
     case dwarf::DW_AT_ranges: {
       // DW_AT_range Value encodes offset in debug_range section.
       DIEInteger *V = cast<DIEInteger>(Values[i]);
-      Asm->EmitLabelOffsetDifference(DwarfDebugRangeSectionSym,
-                                     V->getValue(),
-                                     DwarfDebugRangeSectionSym,
-                                     4);
+
+      if (Asm->MAI->doesDwarfUsesLabelOffsetForRanges()) {
+        Asm->EmitLabelPlusOffset(DwarfDebugRangeSectionSym,
+                                 V->getValue(),
+                                 4);
+      } else {
+        Asm->EmitLabelOffsetDifference(DwarfDebugRangeSectionSym,
+                                       V->getValue(),
+                                       DwarfDebugRangeSectionSym,
+                                       4);
+      }
       break;
     }
     case dwarf::DW_AT_location: {
diff --git a/lib/MC/MCAsmInfo.cpp b/lib/MC/MCAsmInfo.cpp
index b859825..670b2e9 100644
--- a/lib/MC/MCAsmInfo.cpp
+++ b/lib/MC/MCAsmInfo.cpp
@@ -70,6 +70,7 @@ MCAsmInfo::MCAsmInfo() {
   DwarfUsesInlineInfoSection = false;
   DwarfUsesAbsoluteLabelForStmtList = true;
   DwarfSectionOffsetDirective = 0;
+  DwarfUsesLabelOffsetForRanges = true;
   HasMicrosoftFastStdCallMangling = false;
 
   AsmTransCBE = 0;
diff --git a/lib/MC/MCAsmInfoDarwin.cpp b/lib/MC/MCAsmInfoDarwin.cpp
index 4856def..e0e261a 100644
--- a/lib/MC/MCAsmInfoDarwin.cpp
+++ b/lib/MC/MCAsmInfoDarwin.cpp
@@ -46,5 +46,6 @@ MCAsmInfoDarwin::MCAsmInfoDarwin() {
   HasNoDeadStrip = true;
 
   DwarfUsesAbsoluteLabelForStmtList = false;
+  DwarfUsesLabelOffsetForRanges = false;
 }