1 //===-- AVRMachineFuctionInfo.h - AVR machine function info -----*- 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 // This file declares AVR-specific per-machine-function information.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_AVR_MACHINE_FUNCTION_INFO_H
14 #define LLVM_AVR_MACHINE_FUNCTION_INFO_H
15 
16 #include "llvm/CodeGen/MachineFunction.h"
17 
18 namespace llvm {
19 
20 /// Contains AVR-specific information for each MachineFunction.
21 class AVRMachineFunctionInfo : public MachineFunctionInfo {
22   /// Indicates if a register has been spilled by the register
23   /// allocator.
24   bool HasSpills;
25 
26   /// Indicates if there are any fixed size allocas present.
27   /// Note that if there are only variable sized allocas this is set to false.
28   bool HasAllocas;
29 
30   /// Indicates if arguments passed using the stack are being
31   /// used inside the function.
32   bool HasStackArgs;
33 
34   /// Whether or not the function is an interrupt handler.
35   bool IsInterruptHandler;
36 
37   /// Whether or not the function is an non-blocking interrupt handler.
38   bool IsSignalHandler;
39 
40   /// Size of the callee-saved register portion of the
41   /// stack frame in bytes.
42   unsigned CalleeSavedFrameSize;
43 
44   /// FrameIndex for start of varargs area.
45   int VarArgsFrameIndex;
46 
47 public:
48   AVRMachineFunctionInfo()
49       : HasSpills(false), HasAllocas(false), HasStackArgs(false),
50         IsInterruptHandler(false), IsSignalHandler(false),
51         CalleeSavedFrameSize(0), VarArgsFrameIndex(0) {}
52 
53   explicit AVRMachineFunctionInfo(MachineFunction &MF)
54       : HasSpills(false), HasAllocas(false), HasStackArgs(false),
55         CalleeSavedFrameSize(0), VarArgsFrameIndex(0) {
56     unsigned CallConv = MF.getFunction().getCallingConv();
57 
58     this->IsInterruptHandler = CallConv == CallingConv::AVR_INTR || MF.getFunction().hasFnAttribute("interrupt");
59     this->IsSignalHandler = CallConv == CallingConv::AVR_SIGNAL || MF.getFunction().hasFnAttribute("signal");
60   }
61 
62   bool getHasSpills() const { return HasSpills; }
63   void setHasSpills(bool B) { HasSpills = B; }
64 
65   bool getHasAllocas() const { return HasAllocas; }
66   void setHasAllocas(bool B) { HasAllocas = B; }
67 
68   bool getHasStackArgs() const { return HasStackArgs; }
69   void setHasStackArgs(bool B) { HasStackArgs = B; }
70 
71   /// Checks if the function is some form of interrupt service routine.
72   bool isInterruptOrSignalHandler() const { return isInterruptHandler() || isSignalHandler(); }
73 
74   bool isInterruptHandler() const { return IsInterruptHandler; }
75   bool isSignalHandler() const { return IsSignalHandler; }
76 
77   unsigned getCalleeSavedFrameSize() const { return CalleeSavedFrameSize; }
78   void setCalleeSavedFrameSize(unsigned Bytes) { CalleeSavedFrameSize = Bytes; }
79 
80   int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
81   void setVarArgsFrameIndex(int Idx) { VarArgsFrameIndex = Idx; }
82 };
83 
84 } // end llvm namespace
85 
86 #endif // LLVM_AVR_MACHINE_FUNCTION_INFO_H
87