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//===-- llvm/CodeGen/MachineFrameInfo.h -------------------------*- C++ -*-===//
//
// Interface to layout of stack frame on target machine.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_FRAMEINFO_H
#define LLVM_CODEGEN_FRAMEINFO_H
#include "Support/NonCopyable.h"
#include <vector>
class MachineCodeForMethod;
class TargetMachine;
struct MachineFrameInfo : public NonCopyableV {
const TargetMachine ⌖
public:
MachineFrameInfo(const TargetMachine& tgt) : target(tgt) {}
//
// These methods provide constant parameters of the frame layout.
//
virtual int getStackFrameSizeAlignment () const = 0;
virtual int getMinStackFrameSize () const = 0;
virtual int getNumFixedOutgoingArgs () const = 0;
virtual int getSizeOfEachArgOnStack () const = 0;
virtual bool argsOnStackHaveFixedSize () const = 0;
//
// These methods compute offsets using the frame contents for a
// particular method. The frame contents are obtained from the
// MachineCodeInfoForMethod object for the given method.
// The first few methods have default machine-independent implementations.
// The rest must be implemented by the machine-specific subclass.
//
virtual int getIncomingArgOffset (MachineCodeForMethod& mcInfo,
unsigned argNum) const;
virtual int getOutgoingArgOffset (MachineCodeForMethod& mcInfo,
unsigned argNum) const;
virtual int getFirstIncomingArgOffset (MachineCodeForMethod& mcInfo,
bool& growUp) const=0;
virtual int getFirstOutgoingArgOffset (MachineCodeForMethod& mcInfo,
bool& growUp) const=0;
virtual int getFirstOptionalOutgoingArgOffset (MachineCodeForMethod&,
bool& growUp) const=0;
virtual int getFirstAutomaticVarOffset (MachineCodeForMethod& mcInfo,
bool& growUp) const=0;
virtual int getRegSpillAreaOffset (MachineCodeForMethod& mcInfo,
bool& growUp) const=0;
virtual int getTmpAreaOffset (MachineCodeForMethod& mcInfo,
bool& growUp) const=0;
virtual int getDynamicAreaOffset (MachineCodeForMethod& mcInfo,
bool& growUp) const=0;
//
// These methods specify the base register used for each stack area
// (generally FP or SP)
//
virtual int getIncomingArgBaseRegNum() const=0;
virtual int getOutgoingArgBaseRegNum() const=0;
virtual int getOptionalOutgoingArgBaseRegNum() const=0;
virtual int getAutomaticVarBaseRegNum() const=0;
virtual int getRegSpillAreaBaseRegNum() const=0;
virtual int getDynamicAreaBaseRegNum() const=0;
};
#endif
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