llvm-project/llvm/lib/Target/AArch64/AArch64MachineFunctionInfo.h

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//=- AArch64MachineFunctionInfo.h - AArch64 machine function info -*- C++ -*-=//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file declares AArch64-specific per-machine-function information.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_AARCH64_AARCH64MACHINEFUNCTIONINFO_H
#define LLVM_LIB_TARGET_AARCH64_AARCH64MACHINEFUNCTIONINFO_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/MC/MCLinkerOptimizationHint.h"
#include <cassert>
namespace llvm {
class MachineInstr;
/// AArch64FunctionInfo - This class is derived from MachineFunctionInfo and
/// contains private AArch64-specific information for each MachineFunction.
class AArch64FunctionInfo final : public MachineFunctionInfo {
/// Number of bytes of arguments this function has on the stack. If the callee
/// is expected to restore the argument stack this should be a multiple of 16,
/// all usable during a tail call.
///
/// The alternative would forbid tail call optimisation in some cases: if we
/// want to transfer control from a function with 8-bytes of stack-argument
/// space to a function with 16-bytes then misalignment of this value would
/// make a stack adjustment necessary, which could not be undone by the
/// callee.
unsigned BytesInStackArgArea = 0;
/// The number of bytes to restore to deallocate space for incoming
/// arguments. Canonically 0 in the C calling convention, but non-zero when
/// callee is expected to pop the args.
unsigned ArgumentStackToRestore = 0;
/// HasStackFrame - True if this function has a stack frame. Set by
/// determineCalleeSaves().
bool HasStackFrame = false;
/// Amount of stack frame size, not including callee-saved registers.
unsigned LocalStackSize;
/// Amount of stack frame size used for saving callee-saved registers.
unsigned CalleeSavedStackSize;
/// Number of TLS accesses using the special (combinable)
/// _TLS_MODULE_BASE_ symbol.
unsigned NumLocalDynamicTLSAccesses = 0;
/// FrameIndex for start of varargs area for arguments passed on the
/// stack.
int VarArgsStackIndex = 0;
/// FrameIndex for start of varargs area for arguments passed in
/// general purpose registers.
int VarArgsGPRIndex = 0;
/// Size of the varargs area for arguments passed in general purpose
/// registers.
unsigned VarArgsGPRSize = 0;
/// FrameIndex for start of varargs area for arguments passed in
/// floating-point registers.
int VarArgsFPRIndex = 0;
/// Size of the varargs area for arguments passed in floating-point
/// registers.
unsigned VarArgsFPRSize = 0;
/// True if this function has a subset of CSRs that is handled explicitly via
/// copies.
bool IsSplitCSR = false;
/// True when the stack gets realigned dynamically because the size of stack
/// frame is unknown at compile time. e.g., in case of VLAs.
bool StackRealigned = false;
/// True when the callee-save stack area has unused gaps that may be used for
/// other stack allocations.
bool CalleeSaveStackHasFreeSpace = false;
/// Has a value when it is known whether or not the function uses a
/// redzone, and no value otherwise.
/// Initialized during frame lowering, unless the function has the noredzone
/// attribute, in which case it is set to false at construction.
Optional<bool> HasRedZone;
/// ForwardedMustTailRegParms - A list of virtual and physical registers
/// that must be forwarded to every musttail call.
SmallVector<ForwardedRegister, 1> ForwardedMustTailRegParms;
public:
AArch64FunctionInfo() = default;
explicit AArch64FunctionInfo(MachineFunction &MF) {
(void)MF;
// If we already know that the function doesn't have a redzone, set
// HasRedZone here.
if (MF.getFunction().hasFnAttribute(Attribute::NoRedZone))
HasRedZone = false;
}
unsigned getBytesInStackArgArea() const { return BytesInStackArgArea; }
void setBytesInStackArgArea(unsigned bytes) { BytesInStackArgArea = bytes; }
unsigned getArgumentStackToRestore() const { return ArgumentStackToRestore; }
void setArgumentStackToRestore(unsigned bytes) {
ArgumentStackToRestore = bytes;
}
bool hasStackFrame() const { return HasStackFrame; }
void setHasStackFrame(bool s) { HasStackFrame = s; }
bool isStackRealigned() const { return StackRealigned; }
void setStackRealigned(bool s) { StackRealigned = s; }
bool hasCalleeSaveStackFreeSpace() const {
return CalleeSaveStackHasFreeSpace;
}
void setCalleeSaveStackHasFreeSpace(bool s) {
CalleeSaveStackHasFreeSpace = s;
}
bool isSplitCSR() const { return IsSplitCSR; }
void setIsSplitCSR(bool s) { IsSplitCSR = s; }
void setLocalStackSize(unsigned Size) { LocalStackSize = Size; }
unsigned getLocalStackSize() const { return LocalStackSize; }
void setCalleeSavedStackSize(unsigned Size) { CalleeSavedStackSize = Size; }
unsigned getCalleeSavedStackSize() const { return CalleeSavedStackSize; }
void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamicTLSAccesses; }
unsigned getNumLocalDynamicTLSAccesses() const {
return NumLocalDynamicTLSAccesses;
}
Optional<bool> hasRedZone() const { return HasRedZone; }
void setHasRedZone(bool s) { HasRedZone = s; }
int getVarArgsStackIndex() const { return VarArgsStackIndex; }
void setVarArgsStackIndex(int Index) { VarArgsStackIndex = Index; }
int getVarArgsGPRIndex() const { return VarArgsGPRIndex; }
void setVarArgsGPRIndex(int Index) { VarArgsGPRIndex = Index; }
unsigned getVarArgsGPRSize() const { return VarArgsGPRSize; }
void setVarArgsGPRSize(unsigned Size) { VarArgsGPRSize = Size; }
int getVarArgsFPRIndex() const { return VarArgsFPRIndex; }
void setVarArgsFPRIndex(int Index) { VarArgsFPRIndex = Index; }
unsigned getVarArgsFPRSize() const { return VarArgsFPRSize; }
void setVarArgsFPRSize(unsigned Size) { VarArgsFPRSize = Size; }
unsigned getJumpTableEntrySize(int Idx) const {
auto It = JumpTableEntryInfo.find(Idx);
if (It != JumpTableEntryInfo.end())
return It->second.first;
return 4;
}
MCSymbol *getJumpTableEntryPCRelSymbol(int Idx) const {
return JumpTableEntryInfo.find(Idx)->second.second;
}
void setJumpTableEntryInfo(int Idx, unsigned Size, MCSymbol *PCRelSym) {
JumpTableEntryInfo[Idx] = std::make_pair(Size, PCRelSym);
}
using SetOfInstructions = SmallPtrSet<const MachineInstr *, 16>;
const SetOfInstructions &getLOHRelated() const { return LOHRelated; }
// Shortcuts for LOH related types.
class MILOHDirective {
MCLOHType Kind;
/// Arguments of this directive. Order matters.
SmallVector<const MachineInstr *, 3> Args;
public:
using LOHArgs = ArrayRef<const MachineInstr *>;
MILOHDirective(MCLOHType Kind, LOHArgs Args)
: Kind(Kind), Args(Args.begin(), Args.end()) {
assert(isValidMCLOHType(Kind) && "Invalid LOH directive type!");
}
MCLOHType getKind() const { return Kind; }
LOHArgs getArgs() const { return Args; }
};
using MILOHArgs = MILOHDirective::LOHArgs;
using MILOHContainer = SmallVector<MILOHDirective, 32>;
const MILOHContainer &getLOHContainer() const { return LOHContainerSet; }
/// Add a LOH directive of this @p Kind and this @p Args.
void addLOHDirective(MCLOHType Kind, MILOHArgs Args) {
LOHContainerSet.push_back(MILOHDirective(Kind, Args));
LOHRelated.insert(Args.begin(), Args.end());
}
SmallVectorImpl<ForwardedRegister> &getForwardedMustTailRegParms() {
return ForwardedMustTailRegParms;
}
private:
// Hold the lists of LOHs.
MILOHContainer LOHContainerSet;
SetOfInstructions LOHRelated;
DenseMap<int, std::pair<unsigned, MCSymbol *>> JumpTableEntryInfo;
};
} // end namespace llvm
#endif // LLVM_LIB_TARGET_AARCH64_AARCH64MACHINEFUNCTIONINFO_H