lib/Target/AArch64/AArch64CallLowering.h

   1 //===- AArch64CallLowering.h - Call lowering --------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 ///
   9 /// \file
  10 /// This file describes how to lower LLVM calls to machine code calls.
  11 ///
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_LIB_TARGET_AARCH64_AARCH64CALLLOWERING_H
  15 #define LLVM_LIB_TARGET_AARCH64_AARCH64CALLLOWERING_H
  16
  17 #include "llvm/ADT/ArrayRef.h"
  18 #include "llvm/CodeGen/GlobalISel/CallLowering.h"
  19 #include "llvm/IR/CallingConv.h"
  20 #include <cstdint>
  21 #include <functional>
  22
  23 namespace llvm {
  24
  25 class AArch64TargetLowering;
  26 class CCValAssign;
  27 class DataLayout;
  28 class MachineIRBuilder;
  29 class MachineRegisterInfo;
  30 class Type;
  31
  32 class AArch64CallLowering: public CallLowering {
  33 public:
  34   AArch64CallLowering(const AArch64TargetLowering &TLI);
  35
  36   bool lowerReturn(MachineIRBuilder &MIRBuilder, const Value *Val,
  37                    ArrayRef<Register> VRegs,
  38                    Register SwiftErrorVReg) const override;
  39
  40   bool lowerFormalArguments(MachineIRBuilder &MIRBuilder, const Function &F,
  41                             ArrayRef<ArrayRef<Register>> VRegs) const override;
  42
  43   bool lowerCall(MachineIRBuilder &MIRBuilder,
  44                  CallLoweringInfo &Info) const override;
  45
  46   /// Returns true if the call can be lowered as a tail call.
  47   bool
  48   isEligibleForTailCallOptimization(MachineIRBuilder &MIRBuilder,
  49                                     CallLoweringInfo &Info,
  50                                     SmallVectorImpl<ArgInfo> &InArgs,
  51                                     SmallVectorImpl<ArgInfo> &OutArgs) const;
  52
  53   bool supportSwiftError() const override { return true; }
  54
  55 private:
  56   using RegHandler = std::function<void(MachineIRBuilder &, Type *, unsigned,
  57                                         CCValAssign &)>;
  58
  59   using MemHandler =
  60       std::function<void(MachineIRBuilder &, int, CCValAssign &)>;
  61
  62   void splitToValueTypes(const ArgInfo &OrigArgInfo,
  63                          SmallVectorImpl<ArgInfo> &SplitArgs,
  64                          const DataLayout &DL, MachineRegisterInfo &MRI,
  65                          CallingConv::ID CallConv) const;
  66
  67   bool lowerTailCall(MachineIRBuilder &MIRBuilder, CallLoweringInfo &Info,
  68                      SmallVectorImpl<ArgInfo> &OutArgs) const;
  69
  70   bool
  71   doCallerAndCalleePassArgsTheSameWay(CallLoweringInfo &Info,
  72                                       MachineFunction &MF,
  73                                       SmallVectorImpl<ArgInfo> &InArgs) const;
  74
  75   bool
  76   areCalleeOutgoingArgsTailCallable(CallLoweringInfo &Info, MachineFunction &MF,
  77                                     SmallVectorImpl<ArgInfo> &OutArgs) const;
  78 };
  79
  80 } // end namespace llvm
  81
  82 #endif // LLVM_LIB_TARGET_AARCH64_AARCH64CALLLOWERING_H