Add more methods to gather target specific elf stuff

Support for .text relocations, implementing TargetELFWriter overloaded methods for x86/x86_64.
Use a map to track global values to their symbol table indexes
Code cleanup and small fixes

llvm-svn: 73894

1 files changed, 46 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86ELFWriterInfo.cpp b/llvm/lib/Target/X86/X86ELFWriterInfo.cpp
index d84034b9ed4..315118f6109 100644
--- a/llvm/lib/Target/X86/X86ELFWriterInfo.cpp
+++ b/llvm/lib/Target/X86/X86ELFWriterInfo.cpp
@@ -12,11 +12,17 @@
 //===----------------------------------------------------------------------===//
 
 #include "X86ELFWriterInfo.h"
+#include "X86Relocations.h"
 #include "llvm/Function.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetMachine.h"
+
 using namespace llvm;
 
+//===----------------------------------------------------------------------===//
+//  Implementation of the X86ELFWriterInfo class
+//===----------------------------------------------------------------------===//
+
 X86ELFWriterInfo::X86ELFWriterInfo(TargetMachine &TM)
   : TargetELFWriterInfo(TM) {
     bool is64Bit = TM.getTargetData()->getPointerSizeInBits() == 64;
@@ -25,6 +31,34 @@ X86ELFWriterInfo::X86ELFWriterInfo(TargetMachine &TM)
 
 X86ELFWriterInfo::~X86ELFWriterInfo() {}
 
+unsigned X86ELFWriterInfo::getRelocationType(unsigned MachineRelTy) const {
+  if (is64Bit) {
+    switch(MachineRelTy) {
+    case X86::reloc_pcrel_word:
+      return R_X86_64_PC32;
+    case X86::reloc_absolute_word:
+      return R_X86_64_32;
+    case X86::reloc_absolute_dword:
+      return R_X86_64_64;
+    case X86::reloc_picrel_word:
+    default:
+      assert(0 && "unknown relocation type");
+    }
+  } else {
+    switch(MachineRelTy) {
+    case X86::reloc_pcrel_word:
+      return R_386_PC32;
+    case X86::reloc_absolute_word:
+      return R_386_32;
+    case X86::reloc_absolute_dword:
+    case X86::reloc_picrel_word:
+    default:
+      assert(0 && "unknown relocation type");
+    }
+  }
+  return 0;
+}
+
 unsigned X86ELFWriterInfo::getFunctionAlignment(const Function *F) const {
   unsigned FnAlign = 4;
 
@@ -36,3 +70,15 @@ unsigned X86ELFWriterInfo::getFunctionAlignment(const Function *F) const {
 
   return (1 << FnAlign);
 }
+
+long int X86ELFWriterInfo::getAddendForRelTy(unsigned RelTy) const {
+  if (is64Bit) {
+    switch(RelTy) {
+    case R_X86_64_PC32: return -4;
+      break;
+    default:
+      assert(0 && "unknown x86 relocation type");
+    }
+  }
+  return 0;
+}