[Sparc] Use %r_disp32 for pc_rel entries in gcc_except_table and eh_frame.

Otherwise, assembler (gas) fails to assemble them with error message "operation
combines symbols in different segments". This is because MC computes
pc_rel entries with subtract expression between labels from different sections.

llvm-svn: 200373

8 files changed, 107 insertions, 7 deletions

diff --git a/llvm/lib/Target/Sparc/CMakeLists.txt b/llvm/lib/Target/Sparc/CMakeLists.txt
index 4a906e597de..cebda920e74 100644
--- a/llvm/lib/Target/Sparc/CMakeLists.txt
+++ b/llvm/lib/Target/Sparc/CMakeLists.txt
@@ -27,6 +27,7 @@ add_llvm_target(SparcCodeGen
   SparcJITInfo.cpp
   SparcCodeEmitter.cpp
   SparcMCInstLower.cpp
+  SparcTargetObjectFile.cpp
   )
 
 add_subdirectory(TargetInfo)
diff --git a/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCAsmInfo.cpp b/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCAsmInfo.cpp
index e3f957fc4b2..856b4bbf5d1 100644
--- a/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCAsmInfo.cpp
+++ b/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCAsmInfo.cpp
@@ -12,7 +12,9 @@
 //===----------------------------------------------------------------------===//
 
 #include "SparcMCAsmInfo.h"
+#include "SparcMCExpr.h"
 #include "llvm/ADT/Triple.h"
+#include "llvm/MC/MCStreamer.h"
 
 using namespace llvm;
 
@@ -42,4 +44,15 @@ SparcELFMCAsmInfo::SparcELFMCAsmInfo(StringRef TT) {
   UsesELFSectionDirectiveForBSS = true;
 }
 
+const MCExpr*
+SparcELFMCAsmInfo::getExprForPersonalitySymbol(const MCSymbol *Sym,
+                                               unsigned Encoding,
+                                               MCStreamer &Streamer) const {
+  if (Encoding & dwarf::DW_EH_PE_pcrel) {
+    MCContext &Ctx = Streamer.getContext();
+    return SparcMCExpr::Create(SparcMCExpr::VK_Sparc_R_DISP32,
+                               MCSymbolRefExpr::Create(Sym, Ctx), Ctx);
+  }
 
+  return MCAsmInfo::getExprForPersonalitySymbol(Sym, Encoding, Streamer);
+}
diff --git a/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCAsmInfo.h b/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCAsmInfo.h
index 1e58e37ce14..71dcf6bec35 100644
--- a/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCAsmInfo.h
+++ b/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCAsmInfo.h
@@ -17,13 +17,16 @@
 #include "llvm/MC/MCAsmInfoELF.h"
 
 namespace llvm {
-  class StringRef;
+class StringRef;
 
-  class SparcELFMCAsmInfo : public MCAsmInfoELF {
-    virtual void anchor();
-  public:
-    explicit SparcELFMCAsmInfo(StringRef TT);
-  };
+class SparcELFMCAsmInfo : public MCAsmInfoELF {
+  virtual void anchor();
+public:
+  explicit SparcELFMCAsmInfo(StringRef TT);
+  virtual const MCExpr* getExprForPersonalitySymbol(const MCSymbol *Sym,
+                                                    unsigned Encoding,
+                                                    MCStreamer &Streamer) const;
+};
 
 } // namespace llvm
 
diff --git a/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.cpp b/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.cpp
index 103a5a012bc..45f2f9f11e4 100644
--- a/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.cpp
+++ b/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.cpp
@@ -41,6 +41,7 @@ void SparcMCExpr::PrintImpl(raw_ostream &OS) const
   case VK_Sparc_L44:      OS << "%l44("; break;
   case VK_Sparc_HH:       OS << "%hh(";  break;
   case VK_Sparc_HM:       OS << "%hm(";  break;
+  case VK_Sparc_R_DISP32: OS << "%r_disp32("; break;
   case VK_Sparc_TLS_GD_HI22:   OS << "%tgd_hi22(";   break;
   case VK_Sparc_TLS_GD_LO10:   OS << "%tgd_lo10(";   break;
   case VK_Sparc_TLS_GD_ADD:    OS << "%tgd_add(";    break;
@@ -77,6 +78,7 @@ SparcMCExpr::VariantKind SparcMCExpr::parseVariantKind(StringRef name)
     .Case("l44", VK_Sparc_L44)
     .Case("hh",  VK_Sparc_HH)
     .Case("hm",  VK_Sparc_HM)
+    .Case("r_disp32",   VK_Sparc_R_DISP32)
     .Case("tgd_hi22",   VK_Sparc_TLS_GD_HI22)
     .Case("tgd_lo10",   VK_Sparc_TLS_GD_LO10)
     .Case("tgd_add",    VK_Sparc_TLS_GD_ADD)
@@ -101,6 +103,8 @@ SparcMCExpr::VariantKind SparcMCExpr::parseVariantKind(StringRef name)
 bool
 SparcMCExpr::EvaluateAsRelocatableImpl(MCValue &Res,
                                          const MCAsmLayout *Layout) const {
+  if (!Layout)
+    return false;
   return getSubExpr()->EvaluateAsRelocatable(Res, *Layout);
 }
 
diff --git a/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.h b/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.h
index c156ea03512..f1995171864 100644
--- a/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.h
+++ b/llvm/lib/Target/Sparc/MCTargetDesc/SparcMCExpr.h
@@ -31,6 +31,7 @@ public:
     VK_Sparc_L44,
     VK_Sparc_HH,
     VK_Sparc_HM,
+    VK_Sparc_R_DISP32,
     VK_Sparc_TLS_GD_HI22,
     VK_Sparc_TLS_GD_LO10,
     VK_Sparc_TLS_GD_ADD,
diff --git a/llvm/lib/Target/Sparc/SparcISelLowering.cpp b/llvm/lib/Target/Sparc/SparcISelLowering.cpp
index e782be3ebbd..75b0167acd5 100644
--- a/llvm/lib/Target/Sparc/SparcISelLowering.cpp
+++ b/llvm/lib/Target/Sparc/SparcISelLowering.cpp
@@ -17,6 +17,7 @@
 #include "SparcMachineFunctionInfo.h"
 #include "SparcRegisterInfo.h"
 #include "SparcTargetMachine.h"
+#include "SparcTargetObjectFile.h"
 #include "llvm/CodeGen/CallingConvLower.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
@@ -1363,7 +1364,7 @@ static SPCC::CondCodes FPCondCCodeToFCC(ISD::CondCode CC) {
 }
 
 SparcTargetLowering::SparcTargetLowering(TargetMachine &TM)
-  : TargetLowering(TM, new TargetLoweringObjectFileELF()) {
+  : TargetLowering(TM, new SparcELFTargetObjectFile()) {
   Subtarget = &TM.getSubtarget<SparcSubtarget>();
 
   // Set up the register classes.
diff --git a/llvm/lib/Target/Sparc/SparcTargetObjectFile.cpp b/llvm/lib/Target/Sparc/SparcTargetObjectFile.cpp
new file mode 100644
index 00000000000..4913ea75fd9
--- /dev/null
+++ b/llvm/lib/Target/Sparc/SparcTargetObjectFile.cpp
@@ -0,0 +1,43 @@
+//===------- SparcTargetObjectFile.cpp - Sparc Object Info Impl -----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "SparcTargetObjectFile.h"
+#include "MCTargetDesc/SparcMCExpr.h"
+#include "llvm/CodeGen/MachineModuleInfoImpls.h"
+#include "llvm/Support/Dwarf.h"
+
+using namespace llvm;
+
+
+const MCExpr *SparcELFTargetObjectFile::
+getTTypeGlobalReference(const GlobalValue *GV, Mangler *Mang,
+                        MachineModuleInfo *MMI, unsigned Encoding,
+                        MCStreamer &Streamer) const {
+
+  if (Encoding & dwarf::DW_EH_PE_pcrel) {
+    MachineModuleInfoELF &ELFMMI = MMI->getObjFileInfo<MachineModuleInfoELF>();
+
+    MCSymbol *SSym = getSymbolWithGlobalValueBase(*Mang, GV, ".DW.stub");
+
+    // Add information about the stub reference to ELFMMI so that the stub
+    // gets emitted by the asmprinter.
+    MachineModuleInfoImpl::StubValueTy &StubSym = ELFMMI.getGVStubEntry(SSym);
+    if (StubSym.getPointer() == 0) {
+      MCSymbol *Sym = getSymbol(*Mang, GV);
+      StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
+    }
+
+    MCContext &Ctx = getContext();
+    return SparcMCExpr::Create(SparcMCExpr::VK_Sparc_R_DISP32,
+                               MCSymbolRefExpr::Create(SSym, Ctx), Ctx);
+  }
+
+  return TargetLoweringObjectFileELF::
+    getTTypeGlobalReference(GV, Mang, MMI, Encoding, Streamer);
+}
diff --git a/llvm/lib/Target/Sparc/SparcTargetObjectFile.h b/llvm/lib/Target/Sparc/SparcTargetObjectFile.h
new file mode 100644
index 00000000000..7cf850de160
--- /dev/null
+++ b/llvm/lib/Target/Sparc/SparcTargetObjectFile.h
@@ -0,0 +1,34 @@
+//===-- SparcTargetObjectFile.h - Sparc Object Info -------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TARGET_SPARC_TARGETOBJECTFILE_H
+#define LLVM_TARGET_SPARC_TARGETOBJECTFILE_H
+
+#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
+
+namespace llvm {
+
+class MCContext;
+class TargetMachine;
+
+class SparcELFTargetObjectFile : public TargetLoweringObjectFileELF {
+public:
+  SparcELFTargetObjectFile() :
+    TargetLoweringObjectFileELF()
+  {}
+
+  const MCExpr *
+  getTTypeGlobalReference(const GlobalValue *GV, Mangler *Mang,
+                          MachineModuleInfo *MMI, unsigned Encoding,
+                          MCStreamer &Streamer) const;
+};
+
+} // end namespace llvm
+
+#endif