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This implements the review suggestion to simplify the AArch64 backend. If we later discover that we *really* need the extra complexity of the ConstantIslands pass for performance reasons it can be resurrected. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175258 91177308-0d34-0410-b5e6-96231b3b80d8
150 lines
5.4 KiB
C++
150 lines
5.4 KiB
C++
//=- AArch64MachineFuctionInfo.h - AArch64 machine function info -*- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares AArch64-specific per-machine-function information.
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//
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//===----------------------------------------------------------------------===//
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#ifndef AARCH64MACHINEFUNCTIONINFO_H
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#define AARCH64MACHINEFUNCTIONINFO_H
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#include "llvm/CodeGen/MachineFunction.h"
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namespace llvm {
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/// This class is derived from MachineFunctionInfo and contains private AArch64
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/// target-specific information for each MachineFunction.
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class AArch64MachineFunctionInfo : public MachineFunctionInfo {
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virtual void anchor();
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/// Number of bytes of arguments this function has on the stack. If the callee
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/// is expected to restore the argument stack this should be a multiple of 16,
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/// all usable during a tail call.
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///
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/// The alternative would forbid tail call optimisation in some cases: if we
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/// want to transfer control from a function with 8-bytes of stack-argument
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/// space to a function with 16-bytes then misalignment of this value would
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/// make a stack adjustment necessary, which could not be undone by the
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/// callee.
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unsigned BytesInStackArgArea;
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/// The number of bytes to restore to deallocate space for incoming
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/// arguments. Canonically 0 in the C calling convention, but non-zero when
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/// callee is expected to pop the args.
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unsigned ArgumentStackToRestore;
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/// If the stack needs to be adjusted on frame entry in two stages, this
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/// records the size of the first adjustment just prior to storing
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/// callee-saved registers. The callee-saved slots are addressed assuming
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/// SP == <incoming-SP> - InitialStackAdjust.
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unsigned InitialStackAdjust;
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/// Number of local-dynamic TLS accesses.
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unsigned NumLocalDynamics;
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/// @see AArch64 Procedure Call Standard, B.3
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///
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/// The Frame index of the area where LowerFormalArguments puts the
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/// general-purpose registers that might contain variadic parameters.
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int VariadicGPRIdx;
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/// @see AArch64 Procedure Call Standard, B.3
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///
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/// The size of the frame object used to store the general-purpose registers
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/// which might contain variadic arguments. This is the offset from
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/// VariadicGPRIdx to what's stored in __gr_top.
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unsigned VariadicGPRSize;
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/// @see AArch64 Procedure Call Standard, B.3
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///
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/// The Frame index of the area where LowerFormalArguments puts the
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/// floating-point registers that might contain variadic parameters.
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int VariadicFPRIdx;
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/// @see AArch64 Procedure Call Standard, B.3
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///
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/// The size of the frame object used to store the floating-point registers
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/// which might contain variadic arguments. This is the offset from
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/// VariadicFPRIdx to what's stored in __vr_top.
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unsigned VariadicFPRSize;
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/// @see AArch64 Procedure Call Standard, B.3
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///
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/// The Frame index of an object pointing just past the last known stacked
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/// argument on entry to a variadic function. This goes into the __stack field
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/// of the va_list type.
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int VariadicStackIdx;
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/// The offset of the frame pointer from the stack pointer on function
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/// entry. This is expected to be negative.
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int FramePointerOffset;
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public:
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AArch64MachineFunctionInfo()
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: BytesInStackArgArea(0),
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ArgumentStackToRestore(0),
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InitialStackAdjust(0),
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NumLocalDynamics(0),
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VariadicGPRIdx(0),
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VariadicGPRSize(0),
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VariadicFPRIdx(0),
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VariadicFPRSize(0),
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VariadicStackIdx(0),
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FramePointerOffset(0) {}
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explicit AArch64MachineFunctionInfo(MachineFunction &MF)
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: BytesInStackArgArea(0),
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ArgumentStackToRestore(0),
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InitialStackAdjust(0),
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NumLocalDynamics(0),
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VariadicGPRIdx(0),
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VariadicGPRSize(0),
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VariadicFPRIdx(0),
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VariadicFPRSize(0),
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VariadicStackIdx(0),
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FramePointerOffset(0) {}
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unsigned getBytesInStackArgArea() const { return BytesInStackArgArea; }
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void setBytesInStackArgArea (unsigned bytes) { BytesInStackArgArea = bytes;}
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unsigned getArgumentStackToRestore() const { return ArgumentStackToRestore; }
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void setArgumentStackToRestore(unsigned bytes) {
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ArgumentStackToRestore = bytes;
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}
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unsigned getInitialStackAdjust() const { return InitialStackAdjust; }
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void setInitialStackAdjust(unsigned bytes) { InitialStackAdjust = bytes; }
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unsigned getNumLocalDynamicTLSAccesses() const { return NumLocalDynamics; }
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void incNumLocalDynamicTLSAccesses() { ++NumLocalDynamics; }
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int getVariadicGPRIdx() const { return VariadicGPRIdx; }
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void setVariadicGPRIdx(int Idx) { VariadicGPRIdx = Idx; }
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unsigned getVariadicGPRSize() const { return VariadicGPRSize; }
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void setVariadicGPRSize(unsigned Size) { VariadicGPRSize = Size; }
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int getVariadicFPRIdx() const { return VariadicFPRIdx; }
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void setVariadicFPRIdx(int Idx) { VariadicFPRIdx = Idx; }
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unsigned getVariadicFPRSize() const { return VariadicFPRSize; }
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void setVariadicFPRSize(unsigned Size) { VariadicFPRSize = Size; }
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int getVariadicStackIdx() const { return VariadicStackIdx; }
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void setVariadicStackIdx(int Idx) { VariadicStackIdx = Idx; }
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int getFramePointerOffset() const { return FramePointerOffset; }
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void setFramePointerOffset(int Idx) { FramePointerOffset = Idx; }
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};
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} // End llvm namespace
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#endif
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