MCAssembler: Start applying fixups in the data section.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96090 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 25 insertions, 10 deletions

diff --git a/include/llvm/MC/MCAssembler.h b/include/llvm/MC/MCAssembler.h
index 004ecceb8d..acb14155ad 100644
--- a/include/llvm/MC/MCAssembler.h
+++ b/include/llvm/MC/MCAssembler.h
@@ -130,17 +130,14 @@ public:
     return 0;
   }
 
-  std::vector<MCAsmFixup> &getFixups() {
-    return Fixups;
-  }
+  std::vector<MCAsmFixup> &getFixups() { return Fixups; }
+  const std::vector<MCAsmFixup> &getFixups() const { return Fixups; }
 
-  fixup_iterator fixup_begin() {
-    return Fixups.begin();
-  }
+  fixup_iterator fixup_begin() { return Fixups.begin(); }
+  const_fixup_iterator fixup_begin() const { return Fixups.begin(); }
 
-  fixup_iterator fixup_end() {
-    return Fixups.end();
-  }
+  fixup_iterator fixup_end() {return Fixups.end();}
+  const_fixup_iterator fixup_end() const {return Fixups.end();}
 
   size_t fixup_size() const { return Fixups.size(); }
 
diff --git a/lib/MC/MCAssembler.cpp b/lib/MC/MCAssembler.cpp
index a5df4ba42b..c8fa6bd589 100644
--- a/lib/MC/MCAssembler.cpp
+++ b/lib/MC/MCAssembler.cpp
@@ -481,6 +481,8 @@ public:
 
     if (Target.isAbsolute()) { // constant
       // SymbolNum of 0 indicates the absolute section.
+      //
+      // FIXME: When is this generated?
       Type = RIT_Vanilla;
       Value = 0;
       llvm_unreachable("FIXME: Not yet implemented!");
@@ -875,6 +877,12 @@ public:
       OS << StringTable.str();
     }
   }
+
+  void ApplyFixup(const MCAsmFixup &Fixup, MCDataFragment &DF) {
+    // FIXME: Endianness assumption.
+    for (unsigned i = 0; i != Fixup.Size; ++i)
+      DF.getContents()[Fixup.Offset + i] = uint8_t(Fixup.FixedValue >> (i * 8));
+  }
 };
 
 /* *** */
@@ -1070,9 +1078,19 @@ static void WriteFileData(raw_ostream &OS, const MCFragment &F,
     break;
   }
 
-  case MCFragment::FT_Data:
+  case MCFragment::FT_Data: {
+    MCDataFragment &DF = cast<MCDataFragment>(F);
+
+    // Apply the fixups.
+    //
+    // FIXME: Move elsewhere.
+    for (MCDataFragment::const_fixup_iterator it = DF.fixup_begin(),
+           ie = DF.fixup_end(); it != ie; ++it)
+      MOW.ApplyFixup(*it, DF);
+
     OS << cast<MCDataFragment>(F).getContents().str();
     break;
+  }
 
   case MCFragment::FT_Fill: {
     MCFillFragment &FF = cast<MCFillFragment>(F);