Add an EmitAbsValue helper method and use it in cases where we want to be sure

that no relocations are used (on MochO).
Fixes llc producing different output from llc + llvm-mc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121000 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 8 insertions, 9 deletions

diff --git a/lib/MC/MCDwarf.cpp b/lib/MC/MCDwarf.cpp
index 53731dca7e..5d36ee3e62 100644
--- a/lib/MC/MCDwarf.cpp
+++ b/lib/MC/MCDwarf.cpp
@@ -213,15 +213,8 @@ void MCDwarfFileTable::Emit(MCStreamer *MCOS,
 
   // The first 4 bytes is the total length of the information for this
   // compilation unit (not including these 4 bytes for the length).
-  // FIXME: We create the dummy TotalLength variable because LineEndSym points
-  // to the end of the section and the darwin assembler doesn't consider that
-  // difference an assembly time constant. It might be better for this to be
-  // proected by a flag.
-  MCSymbol *TotalLength = MCOS->getContext().CreateTempSymbol();
-  MCOS->EmitAssignment(TotalLength,
-		       MakeStartMinusEndExpr(MCOS, LineStartSym, LineEndSym,
-					     4));
-  MCOS->EmitSymbolValue(TotalLength, 4, 0);
+  MCOS->EmitAbsValue(MakeStartMinusEndExpr(MCOS, LineStartSym, LineEndSym,4),
+                     4);
 
   // Next 2 bytes is the Version, which is Dwarf 2.
   MCOS->EmitIntValue(2, 2);
diff --git a/lib/MC/MCStreamer.cpp b/lib/MC/MCStreamer.cpp
index 6df4ae44e4..b9d59056f3 100644
--- a/lib/MC/MCStreamer.cpp
+++ b/lib/MC/MCStreamer.cpp
@@ -72,6 +72,12 @@ void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
   EmitBytes(OSE.str(), AddrSpace);
 }
 
+void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) {
+  MCSymbol *ABS = getContext().CreateTempSymbol();
+  EmitAssignment(ABS, Value);
+  EmitSymbolValue(ABS, Size, 0);
+}
+
 void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
                                  unsigned AddrSpace) {
   EmitValue(MCSymbolRefExpr::Create(Sym, getContext()), Size, AddrSpace);