1) Proper emit displacements for x86, using absolute relocations where necessary

for ELF to work.  
2) RIP addressing: Use SIB bytes for absolute relocations where RegBase=0, 
IndexReg=0.
3) The JIT can get the real address of cstpools and jmptables during
code emission, fix that for object code emission

llvm-svn: 78129

1 files changed, 15 insertions, 5 deletions

diff --git a/llvm/lib/Target/X86/X86Relocations.h b/llvm/lib/Target/X86/X86Relocations.h
index aceb9fc083f..990962dc417 100644
--- a/llvm/lib/Target/X86/X86Relocations.h
+++ b/llvm/lib/Target/X86/X86Relocations.h
@@ -20,7 +20,9 @@ namespace llvm {
   namespace X86 {
     /// RelocationType - An enum for the x86 relocation codes. Note that
     /// the terminology here doesn't follow x86 convention - word means
-    /// 32-bit and dword means 64-bit.
+    /// 32-bit and dword means 64-bit. The relocations will be treated
+    /// by JIT or ObjectCode emitters, this is transparent to the x86 code 
+    /// emitter but JIT and ObjectCode will treat them differently
     enum RelocationType {
       /// reloc_pcrel_word - PC relative relocation, add the relocated value to
       /// the value already in memory, after we adjust it for where the PC is.
@@ -30,11 +32,19 @@ namespace llvm {
       /// value to the value already in memory, after we adjust it for where the
       /// PIC base is.
       reloc_picrel_word = 1,
-      
-      /// reloc_absolute_word, reloc_absolute_dword - Absolute relocation, just
-      /// add the relocated value to the value already in memory.
+
+      /// reloc_absolute_word - absolute relocation, just add the relocated
+      /// value to the value already in memory.
       reloc_absolute_word = 2,
-      reloc_absolute_dword = 3
+
+      /// reloc_absolute_word_sext - absolute relocation, just add the relocated
+      /// value to the value already in memory. In object files, it represents a
+      /// value which must be sign-extended when resolving the relocation.
+      reloc_absolute_word_sext = 3,
+
+      /// reloc_absolute_dword - absolute relocation, just add the relocated
+      /// value to the value already in memory.
+      reloc_absolute_dword = 4
     };
   }
 }