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//=- AArch64MachineFuctionInfo.h - AArch64 machine function info --*- C++ -*-=//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares AArch64-specific per-machine-function information.
//
//===----------------------------------------------------------------------===//
#ifndef AArch64MACHINEFUNCTIONINFO_H
#define AArch64MACHINEFUNCTIONINFO_H
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/MC/MCLinkerOptimizationHint.h"
namespace llvm {
/// AArch64FunctionInfo - This class is derived from MachineFunctionInfo and
/// contains private AArch64-specific information for each MachineFunction.
class AArch64FunctionInfo : 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;
/// 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;
/// HasStackFrame - True if this function has a stack frame. Set by
/// processFunctionBeforeCalleeSavedScan().
bool HasStackFrame;
/// \brief Amount of stack frame size, not including callee-saved registers.
unsigned LocalStackSize;
/// \brief Number of TLS accesses using the special (combinable)
/// _TLS_MODULE_BASE_ symbol.
unsigned NumLocalDynamicTLSAccesses;
/// \brief FrameIndex for start of varargs area for arguments passed on the
/// stack.
int VarArgsStackIndex;
/// \brief FrameIndex for start of varargs area for arguments passed in
/// general purpose registers.
int VarArgsGPRIndex;
/// \brief Size of the varargs area for arguments passed in general purpose
/// registers.
unsigned VarArgsGPRSize;
/// \brief FrameIndex for start of varargs area for arguments passed in
/// floating-point registers.
int VarArgsFPRIndex;
/// \brief Size of the varargs area for arguments passed in floating-point
/// registers.
unsigned VarArgsFPRSize;
public:
AArch64FunctionInfo()
: BytesInStackArgArea(0), ArgumentStackToRestore(0), HasStackFrame(false),
NumLocalDynamicTLSAccesses(0), VarArgsStackIndex(0), VarArgsGPRIndex(0),
VarArgsGPRSize(0), VarArgsFPRIndex(0), VarArgsFPRSize(0) {}
explicit AArch64FunctionInfo(MachineFunction &MF)
: BytesInStackArgArea(0), ArgumentStackToRestore(0), HasStackFrame(false),
NumLocalDynamicTLSAccesses(0), VarArgsStackIndex(0), VarArgsGPRIndex(0),
VarArgsGPRSize(0), VarArgsFPRIndex(0), VarArgsFPRSize(0) {
(void)MF;
}
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; }
void setLocalStackSize(unsigned Size) { LocalStackSize = Size; }
unsigned getLocalStackSize() const { return LocalStackSize; }
void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamicTLSAccesses; }
unsigned getNumLocalDynamicTLSAccesses() const {
return NumLocalDynamicTLSAccesses;
}
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; }
typedef SmallPtrSet<const MachineInstr *, 16> SetOfInstructions;
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:
typedef SmallVectorImpl<const MachineInstr *> LOHArgs;
MILOHDirective(MCLOHType Kind, const LOHArgs &Args)
: Kind(Kind), Args(Args.begin(), Args.end()) {
assert(isValidMCLOHType(Kind) && "Invalid LOH directive type!");
}
MCLOHType getKind() const { return Kind; }
const LOHArgs &getArgs() const { return Args; }
};
typedef MILOHDirective::LOHArgs MILOHArgs;
typedef SmallVector<MILOHDirective, 32> MILOHContainer;
const MILOHContainer &getLOHContainer() const { return LOHContainerSet; }
/// Add a LOH directive of this @p Kind and this @p Args.
void addLOHDirective(MCLOHType Kind, const MILOHArgs &Args) {
LOHContainerSet.push_back(MILOHDirective(Kind, Args));
LOHRelated.insert(Args.begin(), Args.end());
}
private:
// Hold the lists of LOHs.
MILOHContainer LOHContainerSet;
SetOfInstructions LOHRelated;
};
} // End llvm namespace
#endif // AArch64MACHINEFUNCTIONINFO_H
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