[NVPTX] Start conversion to MC infrastructure

This change converts the NVPTX target to use the MC infrastructure
instead of directly emitting MachineInstr instances. This brings
the target more up-to-date with LLVM TOT, and should fix PR15175
and PR15958 (libNVPTXInstPrinter is empty) as a side-effect.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187798 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 83 insertions, 0 deletions

diff --git a/lib/Target/NVPTX/NVPTXMCExpr.h b/lib/Target/NVPTX/NVPTXMCExpr.h
new file mode 100644
index 0000000000..0efb231d7d
--- /dev/null
+++ b/lib/Target/NVPTX/NVPTXMCExpr.h
@@ -0,0 +1,83 @@
+//===-- NVPTXMCExpr.h - NVPTX 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.
+//
+//===----------------------------------------------------------------------===//
+
+// Modeled after ARMMCExpr
+
+#ifndef NVPTXMCEXPR_H
+#define NVPTXMCEXPR_H
+
+#include "llvm/ADT/APFloat.h"
+#include "llvm/MC/MCExpr.h"
+
+namespace llvm {
+
+class NVPTXFloatMCExpr : public MCTargetExpr {
+public:
+  enum VariantKind {
+    VK_NVPTX_None,
+    VK_NVPTX_SINGLE_PREC_FLOAT,   // FP constant in single-precision
+    VK_NVPTX_DOUBLE_PREC_FLOAT    // FP constant in double-precision
+  };
+
+private:
+  const VariantKind Kind;
+  const APFloat Flt;
+
+  explicit NVPTXFloatMCExpr(VariantKind _Kind, APFloat _Flt)
+    : Kind(_Kind), Flt(_Flt) {}
+
+public:
+  /// @name Construction
+  /// @{
+
+  static const NVPTXFloatMCExpr *Create(VariantKind Kind, APFloat Flt,
+                                        MCContext &Ctx);
+
+  static const NVPTXFloatMCExpr *CreateConstantFPSingle(APFloat Flt,
+                                                        MCContext &Ctx) {
+    return Create(VK_NVPTX_SINGLE_PREC_FLOAT, Flt, Ctx);
+  }
+
+  static const NVPTXFloatMCExpr *CreateConstantFPDouble(APFloat Flt,
+                                                        MCContext &Ctx) {
+    return Create(VK_NVPTX_DOUBLE_PREC_FLOAT, Flt, Ctx);
+  }
+
+  /// @}
+  /// @name Accessors
+  /// @{
+
+  /// getOpcode - Get the kind of this expression.
+  VariantKind getKind() const { return Kind; }
+
+  /// getSubExpr - Get the child of this expression.
+  APFloat getAPFloat() const { return Flt; }
+
+/// @}
+
+  void PrintImpl(raw_ostream &OS) const;
+  bool EvaluateAsRelocatableImpl(MCValue &Res,
+                                 const MCAsmLayout *Layout) const {
+    return false;
+  }
+  void AddValueSymbols(MCAssembler *) const {};
+  const MCSection *FindAssociatedSection() const {
+    return NULL;
+  }
+
+  // There are no TLS NVPTXMCExprs at the moment.
+  void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const {}
+
+  static bool classof(const MCExpr *E) {
+    return E->getKind() == MCExpr::Target;
+  }
+};
+} // end namespace llvm
+
+#endif