1 //=- AArch64MachineFuctionInfo.h - AArch64 machine function info --*- C++ -*-=//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares AArch64-specific per-machine-function information.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_LIB_TARGET_AARCH64_AARCH64MACHINEFUNCTIONINFO_H
15 #define LLVM_LIB_TARGET_AARCH64_AARCH64MACHINEFUNCTIONINFO_H
17 #include "llvm/ADT/SmallPtrSet.h"
18 #include "llvm/ADT/SmallVector.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/MC/MCLinkerOptimizationHint.h"
24 /// AArch64FunctionInfo - This class is derived from MachineFunctionInfo and
25 /// contains private AArch64-specific information for each MachineFunction.
26 class AArch64FunctionInfo
: public MachineFunctionInfo
{
28 /// Number of bytes of arguments this function has on the stack. If the callee
29 /// is expected to restore the argument stack this should be a multiple of 16,
30 /// all usable during a tail call.
32 /// The alternative would forbid tail call optimisation in some cases: if we
33 /// want to transfer control from a function with 8-bytes of stack-argument
34 /// space to a function with 16-bytes then misalignment of this value would
35 /// make a stack adjustment necessary, which could not be undone by the
37 unsigned BytesInStackArgArea
;
39 /// The number of bytes to restore to deallocate space for incoming
40 /// arguments. Canonically 0 in the C calling convention, but non-zero when
41 /// callee is expected to pop the args.
42 unsigned ArgumentStackToRestore
;
44 /// HasStackFrame - True if this function has a stack frame. Set by
45 /// processFunctionBeforeCalleeSavedScan().
48 /// \brief Amount of stack frame size, not including callee-saved registers.
49 unsigned LocalStackSize
;
51 /// \brief Number of TLS accesses using the special (combinable)
52 /// _TLS_MODULE_BASE_ symbol.
53 unsigned NumLocalDynamicTLSAccesses
;
55 /// \brief FrameIndex for start of varargs area for arguments passed on the
57 int VarArgsStackIndex
;
59 /// \brief FrameIndex for start of varargs area for arguments passed in
60 /// general purpose registers.
63 /// \brief Size of the varargs area for arguments passed in general purpose
65 unsigned VarArgsGPRSize
;
67 /// \brief FrameIndex for start of varargs area for arguments passed in
68 /// floating-point registers.
71 /// \brief Size of the varargs area for arguments passed in floating-point
73 unsigned VarArgsFPRSize
;
77 : BytesInStackArgArea(0), ArgumentStackToRestore(0), HasStackFrame(false),
78 NumLocalDynamicTLSAccesses(0), VarArgsStackIndex(0), VarArgsGPRIndex(0),
79 VarArgsGPRSize(0), VarArgsFPRIndex(0), VarArgsFPRSize(0) {}
81 explicit AArch64FunctionInfo(MachineFunction
&MF
)
82 : BytesInStackArgArea(0), ArgumentStackToRestore(0), HasStackFrame(false),
83 NumLocalDynamicTLSAccesses(0), VarArgsStackIndex(0), VarArgsGPRIndex(0),
84 VarArgsGPRSize(0), VarArgsFPRIndex(0), VarArgsFPRSize(0) {
88 unsigned getBytesInStackArgArea() const { return BytesInStackArgArea
; }
89 void setBytesInStackArgArea(unsigned bytes
) { BytesInStackArgArea
= bytes
; }
91 unsigned getArgumentStackToRestore() const { return ArgumentStackToRestore
; }
92 void setArgumentStackToRestore(unsigned bytes
) {
93 ArgumentStackToRestore
= bytes
;
96 bool hasStackFrame() const { return HasStackFrame
; }
97 void setHasStackFrame(bool s
) { HasStackFrame
= s
; }
99 void setLocalStackSize(unsigned Size
) { LocalStackSize
= Size
; }
100 unsigned getLocalStackSize() const { return LocalStackSize
; }
102 void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamicTLSAccesses
; }
103 unsigned getNumLocalDynamicTLSAccesses() const {
104 return NumLocalDynamicTLSAccesses
;
107 int getVarArgsStackIndex() const { return VarArgsStackIndex
; }
108 void setVarArgsStackIndex(int Index
) { VarArgsStackIndex
= Index
; }
110 int getVarArgsGPRIndex() const { return VarArgsGPRIndex
; }
111 void setVarArgsGPRIndex(int Index
) { VarArgsGPRIndex
= Index
; }
113 unsigned getVarArgsGPRSize() const { return VarArgsGPRSize
; }
114 void setVarArgsGPRSize(unsigned Size
) { VarArgsGPRSize
= Size
; }
116 int getVarArgsFPRIndex() const { return VarArgsFPRIndex
; }
117 void setVarArgsFPRIndex(int Index
) { VarArgsFPRIndex
= Index
; }
119 unsigned getVarArgsFPRSize() const { return VarArgsFPRSize
; }
120 void setVarArgsFPRSize(unsigned Size
) { VarArgsFPRSize
= Size
; }
122 typedef SmallPtrSet
<const MachineInstr
*, 16> SetOfInstructions
;
124 const SetOfInstructions
&getLOHRelated() const { return LOHRelated
; }
126 // Shortcuts for LOH related types.
127 class MILOHDirective
{
130 /// Arguments of this directive. Order matters.
131 SmallVector
<const MachineInstr
*, 3> Args
;
134 typedef SmallVectorImpl
<const MachineInstr
*> LOHArgs
;
136 MILOHDirective(MCLOHType Kind
, const LOHArgs
&Args
)
137 : Kind(Kind
), Args(Args
.begin(), Args
.end()) {
138 assert(isValidMCLOHType(Kind
) && "Invalid LOH directive type!");
141 MCLOHType
getKind() const { return Kind
; }
142 const LOHArgs
&getArgs() const { return Args
; }
145 typedef MILOHDirective::LOHArgs MILOHArgs
;
146 typedef SmallVector
<MILOHDirective
, 32> MILOHContainer
;
148 const MILOHContainer
&getLOHContainer() const { return LOHContainerSet
; }
150 /// Add a LOH directive of this @p Kind and this @p Args.
151 void addLOHDirective(MCLOHType Kind
, const MILOHArgs
&Args
) {
152 LOHContainerSet
.push_back(MILOHDirective(Kind
, Args
));
153 LOHRelated
.insert(Args
.begin(), Args
.end());
157 // Hold the lists of LOHs.
158 MILOHContainer LOHContainerSet
;
159 SetOfInstructions LOHRelated
;
161 } // End llvm namespace