Merging r238751:

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r238751 | rafael | 2015-06-01 16:10:51 +0100 (Mon, 01 Jun 2015) | 3 lines

Fix relocation selection for foo-. on mips.

This handles only the 32 bit case.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_36@239698 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp

@@ -656,7 +656,7 @@ void SelectionDAGISel::CodeGenAndEmitDAG() {
   (void)BlockNumber;
   bool MatchFilterBB = false; (void)MatchFilterBB;
 #ifndef NDEBUG
-  MatchFilterBB = (!FilterDAGBasicBlockName.empty() &&
+  MatchFilterBB = (FilterDAGBasicBlockName.empty() ||
                    FilterDAGBasicBlockName ==
                        FuncInfo->MBB->getBasicBlock()->getName().str());
 #endif

lib/MC/MCObjectFileInfo.cpp

@@ -350,6 +350,8 @@ void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
     // eh_frame section can be read-only.  DW.ref.personality will be generated
     // for relocation.
     PersonalityEncoding = dwarf::DW_EH_PE_indirect;
+    LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
+    TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
     break;
   case Triple::ppc64:
   case Triple::ppc64le:

lib/Target/Mips/MCTargetDesc/MipsELFObjectWriter.cpp

@@ -55,8 +55,7 @@ unsigned MipsELFObjectWriter::GetRelocType(const MCValue &Target,
   default:
     llvm_unreachable("invalid fixup kind!");
   case FK_Data_4:
-    Type = ELF::R_MIPS_32;
+    return IsPCRel ? ELF::R_MIPS_PC32 : ELF::R_MIPS_32;
-    break;
   case FK_Data_8:
     Type = ELF::R_MIPS_64;
     break;

lib/Target/Mips/MipsAsmPrinter.cpp

@@ -29,6 +29,8 @@
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineJumpTableInfo.h"
 #include "llvm/CodeGen/MachineMemOperand.h"
+#include "llvm/CodeGen/MachineModuleInfoImpls.h"
+#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
 #include "llvm/IR/BasicBlock.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/InlineAsm.h"
@@ -1033,6 +1035,27 @@ void MipsAsmPrinter::EmitEndOfAsmFile(Module &M) {
   }
   // return to the text section
   OutStreamer.SwitchSection(OutContext.getObjectFileInfo()->getTextSection());
+
+  /* if (Subtarget->isTargetELF()) */ {
+    const TargetLoweringObjectFileELF &TLOFELF =
+      static_cast<const TargetLoweringObjectFileELF &>(getObjFileLowering());
+
+    MachineModuleInfoELF &MMIELF = MMI->getObjFileInfo<MachineModuleInfoELF>();
+
+    // Output stubs for external and common global variables.
+    MachineModuleInfoELF::SymbolListTy Stubs = MMIELF.GetGVStubList();
+    if (!Stubs.empty()) {
+      OutStreamer.SwitchSection(TLOFELF.getDataRelSection());
+      const DataLayout *TD = TM.getSubtargetImpl()->getDataLayout();
+
+      for (const auto &Stub : Stubs) {
+        OutStreamer.EmitLabel(Stub.first);
+        OutStreamer.EmitSymbolValue(Stub.second.getPointer(),
+                                    TD->getPointerSize());
+      }
+      Stubs.clear();
+    }
+  }
 }
 
 void MipsAsmPrinter::PrintDebugValueComment(const MachineInstr *MI,

test/MC/Mips/relocation.s

@@ -0,0 +1,10 @@
+// RUN: llvm-mc -filetype=obj -triple mipsel-unknown-linux < %s | llvm-readobj -r | FileCheck  %s
+
+// Test that we produce the correct relocation.
+// FIXME: move more relocation only tests here.
+
+        .long foo
+// CHECK: R_MIPS_32 foo
+
+        .long foo-.
+// CHECK: R_MIPS_PC32 foo