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//===-- llvm/Target/TargetFrameInfo.h ---------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Interface to describe the layout of a stack frame on the target machine.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETFRAMEINFO_H
#define LLVM_TARGET_TARGETFRAMEINFO_H
namespace llvm {
class MachineFunction;
struct TargetFrameInfo {
enum StackDirection {
StackGrowsUp, // Adding to the stack increases the stack address
StackGrowsDown // Adding to the stack decreases the stack address
};
private:
StackDirection StackDir;
unsigned StackAlignment;
int LocalAreaOffset;
public:
TargetFrameInfo(StackDirection D, unsigned StackAl, int LAO)
: StackDir(D), StackAlignment(StackAl), LocalAreaOffset(LAO) {}
// These methods return information that describes the abstract stack layout
// of the target machine.
/// getStackGrowthDirection - Return the direction the stack grows
///
StackDirection getStackGrowthDirection() const { return StackDir; }
/// getStackAlignment - This method returns the number of bytes that the stack
/// pointer must be aligned to. Typically, this is the largest alignment for
/// any data object in the target.
///
unsigned getStackAlignment() const { return StackAlignment; }
/// getOffsetOfLocalArea - This method returns the offset of the local area
/// from the stack pointer on entrance to a function.
///
int getOffsetOfLocalArea() const { return LocalAreaOffset; }
//===--------------------------------------------------------------------===//
// These methods provide details of the stack frame used by Sparc, thus they
// are Sparc specific.
//===--------------------------------------------------------------------===//
virtual int getStackFrameSizeAlignment () const;
virtual int getMinStackFrameSize () const;
virtual int getNumFixedOutgoingArgs () const;
virtual int getSizeOfEachArgOnStack () const;
virtual bool argsOnStackHaveFixedSize () const;
// This method adjusts a stack offset to meet alignment rules of target.
virtual int adjustAlignment(int unalignedOffset, bool growUp,
unsigned align) const;
// These methods compute offsets using the frame contents for a particular
// function. The frame contents are obtained from the MachineFunction object
// for the given function. The rest must be implemented by the
// machine-specific subclass.
//
virtual int getIncomingArgOffset (MachineFunction& mcInfo,
unsigned argNum) const;
virtual int getOutgoingArgOffset (MachineFunction& mcInfo,
unsigned argNum) const;
virtual int getFirstIncomingArgOffset (MachineFunction& mcInfo,
bool& growUp) const;
virtual int getFirstOutgoingArgOffset (MachineFunction& mcInfo,
bool& growUp) const;
virtual int getFirstOptionalOutgoingArgOffset (MachineFunction&,
bool& growUp) const;
virtual int getFirstAutomaticVarOffset (MachineFunction& mcInfo,
bool& growUp) const;
virtual int getRegSpillAreaOffset (MachineFunction& mcInfo,
bool& growUp) const;
virtual int getTmpAreaOffset (MachineFunction& mcInfo,
bool& growUp) const;
virtual int getDynamicAreaOffset (MachineFunction& mcInfo,
bool& growUp) const;
//
// These methods specify the base register used for each stack area
// (generally FP or SP)
//
virtual int getIncomingArgBaseRegNum() const;
virtual int getOutgoingArgBaseRegNum() const;
virtual int getOptionalOutgoingArgBaseRegNum() const;
virtual int getAutomaticVarBaseRegNum() const;
virtual int getRegSpillAreaBaseRegNum() const;
virtual int getDynamicAreaBaseRegNum() const;
};
} // End llvm namespace
#endif
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