Add a MCObjectFormat class so that code common to all targets that use a

single object format can be shared.

This also adds support for

mov zed+(bar-foo), %eax

on ELF and COFF targets.

llvm-svn: 116675

1 files changed, 31 insertions, 0 deletions

diff --git a/llvm/lib/MC/MCObjectFormat.cpp b/llvm/lib/MC/MCObjectFormat.cpp
new file mode 100644
index 00000000000..07d361c8a49
--- /dev/null
+++ b/llvm/lib/MC/MCObjectFormat.cpp
@@ -0,0 +1,31 @@
+//===- lib/MC/MCObjectFormat.cpp - MCObjectFormat 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/MCObjectFormat.h"
+#include "llvm/MC/MCSymbol.h"
+
+using namespace llvm;
+
+bool MCELFObjectFormat::isAbsolute(bool IsSet, const MCSymbol &A,
+                                   const MCSymbol &B) const {
+  // On ELF A - B is absolute if A and B are in the same section.
+  return &A.getSection() == &B.getSection();
+}
+
+bool MCMachOObjectFormat::isAbsolute(bool IsSet, const MCSymbol &A,
+                                     const MCSymbol &B) const  {
+  // On MachO A - B is absolute only if in a set.
+  return IsSet;
+}
+
+bool MCCOFFObjectFormat::isAbsolute(bool IsSet, const MCSymbol &A,
+                                    const MCSymbol &B) const  {
+  // On COFF A - B is absolute if A and B are in the same section.
+  return &A.getSection() == &B.getSection();
+}