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