X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FMCObjectWriter.cpp;h=94d7cd6fd4f3ac424921ec31b827b876abdcf48e;hb=12af22e8cc217827cf4f118b0f5e4ebbda9925ae;hp=6cee76d0400ac7d35f1bc75b68d3d8efe5b0d9c4;hpb=c095793b4ab027181605c79c9808df12afe45d63;p=oota-llvm.git

diff --git a/lib/MC/MCObjectWriter.cpp b/lib/MC/MCObjectWriter.cpp
index 6cee76d0400..94d7cd6fd4f 100644
--- a/lib/MC/MCObjectWriter.cpp
+++ b/lib/MC/MCObjectWriter.cpp
@@ -7,35 +7,50 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/MCSymbol.h"
 
 using namespace llvm;
 
 MCObjectWriter::~MCObjectWriter() {
 }
 
-/// Utility function to encode a SLEB128 value.
-void MCObjectWriter::EncodeSLEB128(int64_t Value, raw_ostream &OS) {
-  bool More;
-  do {
-    uint8_t Byte = Value & 0x7f;
-    // NOTE: this assumes that this signed shift is an arithmetic right shift.
-    Value >>= 7;
-    More = !((((Value == 0 ) && ((Byte & 0x40) == 0)) ||
-              ((Value == -1) && ((Byte & 0x40) != 0))));
-    if (More)
-      Byte |= 0x80; // Mark this byte that that more bytes will follow.
-    OS << char(Byte);
-  } while (More);
+bool
+MCObjectWriter::IsSymbolRefDifferenceFullyResolved(const MCAssembler &Asm,
+                                                   const MCSymbolRefExpr *A,
+                                                   const MCSymbolRefExpr *B,
+                                                   bool InSet) const {
+  // Modified symbol references cannot be resolved.
+  if (A->getKind() != MCSymbolRefExpr::VK_None ||
+      B->getKind() != MCSymbolRefExpr::VK_None)
+    return false;
+
+  const MCSymbol &SA = A->getSymbol();
+  const MCSymbol &SB = B->getSymbol();
+  if (SA.AliasedSymbol().isUndefined() || SB.AliasedSymbol().isUndefined())
+    return false;
+
+  const MCSymbolData &DataA = Asm.getSymbolData(SA);
+  const MCSymbolData &DataB = Asm.getSymbolData(SB);
+  if(!DataA.getFragment() || !DataB.getFragment())
+    return false;
+
+  return IsSymbolRefDifferenceFullyResolvedImpl(Asm, DataA,
+                                                *DataB.getFragment(),
+                                                InSet,
+                                                false);
 }
 
-/// Utility function to encode a ULEB128 value.
-void MCObjectWriter::EncodeULEB128(uint64_t Value, raw_ostream &OS) {
-  do {
-    uint8_t Byte = Value & 0x7f;
-    Value >>= 7;
-    if (Value != 0)
-      Byte |= 0x80; // Mark this byte that that more bytes will follow.
-    OS << char(Byte);
-  } while (Value != 0);
+bool
+MCObjectWriter::IsSymbolRefDifferenceFullyResolvedImpl(const MCAssembler &Asm,
+                                                      const MCSymbolData &DataA,
+                                                      const MCFragment &FB,
+                                                      bool InSet,
+                                                      bool IsPCRel) const {
+  const MCSection &SecA = DataA.getSymbol().AliasedSymbol().getSection();
+  const MCSection &SecB = FB.getParent()->getSection();
+  // On ELF and COFF  A - B is absolute if A and B are in the same section.
+  return &SecA == &SecB;
 }