Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

external/llvm/lib/Target/ARM/ARMCallLowering.h

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+//===- llvm/lib/Target/ARM/ARMCallLowering.h - Call lowering ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file
+/// This file describes how to lower LLVM calls to machine code calls.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_ARM_ARMCALLLOWERING_H
+#define LLVM_LIB_TARGET_ARM_ARMCALLLOWERING_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/CodeGen/GlobalISel/CallLowering.h"
+#include "llvm/IR/CallingConv.h"
+#include <cstdint>
+#include <functional>
+
+namespace llvm {
+
+class ARMTargetLowering;
+class MachineFunction;
+class MachineInstrBuilder;
+class MachineIRBuilder;
+class Value;
+
+class ARMCallLowering : public CallLowering {
+public:
+  ARMCallLowering(const ARMTargetLowering &TLI);
+
+  bool lowerReturn(MachineIRBuilder &MIRBuiler, const Value *Val,
+                   unsigned VReg) const override;
+
+  bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
+                            ArrayRef<unsigned> VRegs) const override;
+
+  bool lowerCall(MachineIRBuilder &MIRBuilder, CallingConv::ID CallConv,
+                 const MachineOperand &Callee, const ArgInfo &OrigRet,
+                 ArrayRef<ArgInfo> OrigArgs) const override;
+
+private:
+  bool lowerReturnVal(MachineIRBuilder &MIRBuilder, const Value *Val,
+                      unsigned VReg, MachineInstrBuilder &Ret) const;
+
+  using SplitArgTy = std::function<void(unsigned Reg, uint64_t Offset)>;
+
+  /// Split an argument into one or more arguments that the CC lowering can cope
+  /// with (e.g. replace pointers with integers).
+  void splitToValueTypes(const ArgInfo &OrigArg,
+                         SmallVectorImpl<ArgInfo> &SplitArgs,
+                         MachineFunction &MF,
+                         const SplitArgTy &PerformArgSplit) const;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_LIB_TARGET_ARM_ARMCALLLOWERING_H