[lanai] Add Lanai backend.

Add the Lanai backend to lib/Target.

General Lanai backend discussion on llvm-dev thread "[RFC] Lanai backend" (http://lists.llvm.org/pipermail/llvm-dev/2016-February/095118.html).

Differential Revision: http://reviews.llvm.org/D17011



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264578 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 56 insertions, 0 deletions

diff --git a/lib/Target/Lanai/MCTargetDesc/LanaiMCExpr.h b/lib/Target/Lanai/MCTargetDesc/LanaiMCExpr.h
new file mode 100644
index 00000000000..f481b039bda
--- /dev/null
+++ b/lib/Target/Lanai/MCTargetDesc/LanaiMCExpr.h
@@ -0,0 +1,56 @@
+//===-- LanaiMCExpr.h - Lanai specific MC expression classes ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_LANAI_MCTARGETDESC_LANAIMCEXPR_H
+#define LLVM_LIB_TARGET_LANAI_MCTARGETDESC_LANAIMCEXPR_H
+
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCValue.h"
+
+namespace llvm {
+
+class LanaiMCExpr : public MCTargetExpr {
+public:
+  enum VariantKind { VK_Lanai_None, VK_Lanai_ABS_HI, VK_Lanai_ABS_LO };
+
+private:
+  const VariantKind Kind;
+  const MCExpr *Expr;
+
+  explicit LanaiMCExpr(VariantKind Kind, const MCExpr *Expr)
+      : Kind(Kind), Expr(Expr) {}
+
+public:
+  static const LanaiMCExpr *create(VariantKind Kind, const MCExpr *Expr,
+                                   MCContext &Ctx);
+
+  // Returns the kind of this expression.
+  VariantKind getKind() const { return Kind; }
+
+  // Returns the child of this expression.
+  const MCExpr *getSubExpr() const { return Expr; }
+
+  void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
+  bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout,
+                                 const MCFixup *Fixup) const override;
+  void visitUsedExpr(MCStreamer &Streamer) const override;
+  MCFragment *findAssociatedFragment() const override {
+    return getSubExpr()->findAssociatedFragment();
+  }
+
+  // There are no TLS LanaiMCExprs at the moment.
+  void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override {}
+
+  static bool classof(const MCExpr *E) {
+    return E->getKind() == MCExpr::Target;
+  }
+};
+} // end namespace llvm
+
+#endif