Add support to properly reference private symbols on relocation entries.

Use proper relocation type to build relocations for JumpTables (rodata
sections).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76326 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 46 insertions, 6 deletions

diff --git a/lib/Target/X86/X86ELFWriterInfo.cpp b/lib/Target/X86/X86ELFWriterInfo.cpp
index 2736a81cdd..4002e26530 100644
--- a/lib/Target/X86/X86ELFWriterInfo.cpp
+++ b/lib/Target/X86/X86ELFWriterInfo.cpp
@@ -43,7 +43,7 @@ unsigned X86ELFWriterInfo::getRelocationType(unsigned MachineRelTy) const {
       return R_X86_64_64;
     case X86::reloc_picrel_word:
     default:
-      llvm_unreachable("unknown relocation type");
+      llvm_unreachable("unknown x86_64 machine relocation type");
     }
   } else {
     switch(MachineRelTy) {
@@ -54,22 +54,55 @@ unsigned X86ELFWriterInfo::getRelocationType(unsigned MachineRelTy) const {
     case X86::reloc_absolute_dword:
     case X86::reloc_picrel_word:
     default:
-      llvm_unreachable("unknown relocation type");
+      llvm_unreachable("unknown x86 machine relocation type");
     }
   }
   return 0;
 }
 
-long int X86ELFWriterInfo::getAddendForRelTy(unsigned RelTy) const {
+long int X86ELFWriterInfo::getDefaultAddendForRelTy(unsigned RelTy) const {
   if (is64Bit) {
     switch(RelTy) {
     case R_X86_64_PC32: return -4;
-      break;
     case R_X86_64_32: return 0;
-      break;
+    default:
+      llvm_unreachable("unknown x86_64 relocation type");
+    }
+  } else {
+    switch(RelTy) {
+      case R_386_PC32: return -4;
+      case R_386_32: return 0;
+    default:
+      llvm_unreachable("unknown x86 relocation type");
+    }
+  }
+  return 0;
+}
+
+unsigned X86ELFWriterInfo::getRelocationTySize(unsigned RelTy) const {
+  if (is64Bit) {
+    switch(RelTy) {
+      case R_X86_64_PC32:
+      case R_X86_64_32:
+        return 32;
+      case R_X86_64_64:
+        return 64;
+    default:
+      llvm_unreachable("unknown x86_64 relocation type");
+    }
+  } else {
+    switch(RelTy) {
+      case R_386_PC32:
+      case R_386_32:
+        return 32;
     default:
       llvm_unreachable("unknown x86 relocation type");
     }
   }
   return 0;
 }
+
+unsigned X86ELFWriterInfo::getJumpTableMachineRelocationTy() const {
+  return X86::reloc_absolute_dword;
+}
+
diff --git a/lib/Target/X86/X86ELFWriterInfo.h b/lib/Target/X86/X86ELFWriterInfo.h
index 2ba1a0bd70..f372658f70 100644
--- a/lib/Target/X86/X86ELFWriterInfo.h
+++ b/lib/Target/X86/X86ELFWriterInfo.h
@@ -51,7 +51,14 @@ namespace llvm {
 
     /// getAddendForRelTy - Gets the addend value for an ELF relocation entry
     /// based on the target relocation type
-    virtual long int getAddendForRelTy(unsigned RelTy) const;
+    virtual long int getDefaultAddendForRelTy(unsigned RelTy) const;
+
+    /// getRelTySize - Returns the size of relocatable field in bits
+    virtual unsigned getRelocationTySize(unsigned RelTy) const;
+
+    /// getJumpTableRelocationTy - Returns the machine relocation type used
+    /// to reference a jumptable.
+    virtual unsigned getJumpTableMachineRelocationTy() const;
   };
 
 } // end llvm namespace