Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/llvm/lib/MC/MCObjectWriter.cpp

@@ -0,0 +1,53 @@
+//===- lib/MC/MCObjectWriter.cpp - MCObjectWriter implementation ----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCFragment.h"
+#include "llvm/MC/MCSymbol.h"
+
+using namespace llvm;
+
+MCObjectWriter::~MCObjectWriter() = default;
+
+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.isUndefined() || SB.isUndefined())
+    return false;
+
+  if (!SA.getFragment() || !SB.getFragment())
+    return false;
+
+  return isSymbolRefDifferenceFullyResolvedImpl(Asm, SA, SB, InSet);
+}
+
+bool MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(
+    const MCAssembler &Asm, const MCSymbol &A, const MCSymbol &B,
+    bool InSet) const {
+  return isSymbolRefDifferenceFullyResolvedImpl(Asm, A, *B.getFragment(), InSet,
+                                                false);
+}
+
+bool MCObjectWriter::isSymbolRefDifferenceFullyResolvedImpl(
+    const MCAssembler &Asm, const MCSymbol &SymA, const MCFragment &FB,
+    bool InSet, bool IsPCRel) const {
+  const MCSection &SecA = SymA.getSection();
+  const MCSection &SecB = *FB.getParent();
+  // On ELF and COFF  A - B is absolute if A and B are in the same section.
+  return &SecA == &SecB;
+}