Generalize emitAbsoluteSymbolDiff.
This makes emitAbsoluteSymbolDiff always succeed and moves logic from the asm
printer to it.
The object one now also works on ELF. If two symbols are in the same fragment,
we will never move them apart.
llvm-svn: 239552
diff --git a/llvm/lib/MC/MCStreamer.cpp b/llvm/lib/MC/MCStreamer.cpp
index 011969a..349de97 100644
--- a/llvm/lib/MC/MCStreamer.cpp
+++ b/llvm/lib/MC/MCStreamer.cpp
@@ -638,6 +638,25 @@
visitUsedExpr(*Inst.getOperand(i).getExpr());
}
+void MCStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
+ unsigned Size) {
+ // Get the Hi-Lo expression.
+ const MCExpr *Diff =
+ MCBinaryExpr::createSub(MCSymbolRefExpr::create(Hi, Context),
+ MCSymbolRefExpr::create(Lo, Context), Context);
+
+ const MCAsmInfo *MAI = Context.getAsmInfo();
+ if (!MAI->doesSetDirectiveSuppressesReloc()) {
+ EmitValue(Diff, Size);
+ return;
+ }
+
+ // Otherwise, emit with .set (aka assignment).
+ MCSymbol *SetLabel = Context.createTempSymbol("set", true);
+ EmitAssignment(SetLabel, Diff);
+ EmitSymbolValue(SetLabel, Size);
+}
+
void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}