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Expose some very simple information about the frame, rather than in-depth

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target specific information.  Rename MachineFrameInfo to TargetFrameInfo

llvm-svn: 5168
This commit is contained in:
Chris Lattner 2002-12-28 20:12:10 +00:00
parent b525ce97cc
commit 51c7c172db
1 changed files with 65 additions and 46 deletions
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111
include/llvm/Target/TargetFrameInfo.h
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@ -1,76 +1,95 @@
//===-- llvm/CodeGen/MachineFrameInfo.h -------------------------*- C++ -*-===//
//===-- llvm/Target/TargetFrameInfo.h ---------------------------*- C++ -*-===//
//
// Interface to layout of stack frame on target machine.
// Interface to describe the layout of a stack frame on the target machine.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_FRAMEINFO_H
#define LLVM_CODEGEN_FRAMEINFO_H
#include "Support/NonCopyable.h"
#include <vector>
#ifndef LLVM_TARGET_TARGETFRAMEINFO_H
#define LLVM_TARGET_TARGETFRAMEINFO_H
class MachineFunction;
class TargetMachine;
struct MachineFrameInfo : public NonCopyableV {
const TargetMachine &target;
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:
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;
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 { abort(); }
virtual int getMinStackFrameSize () const { abort(); }
virtual int getNumFixedOutgoingArgs () const { abort(); }
virtual int getSizeOfEachArgOnStack () const { abort(); }
virtual bool argsOnStackHaveFixedSize () const { abort(); }
// This method adjusts a stack offset to meet alignment rules of target.
//
virtual int adjustAlignment (int unalignedOffset,
bool growUp,
unsigned int align) const {
return unalignedOffset + (growUp? +1:-1)*(unalignedOffset % align);
}
virtual int adjustAlignment(int unalignedOffset, bool growUp,
unsigned align) const { abort(); }
// 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.
// 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;
unsigned argNum)const{abort();}
virtual int getOutgoingArgOffset (MachineFunction& mcInfo,
unsigned argNum) const;
unsigned argNum)const{abort();}
virtual int getFirstIncomingArgOffset (MachineFunction& mcInfo,
bool& growUp) const=0;
bool& growUp) const { abort();}
virtual int getFirstOutgoingArgOffset (MachineFunction& mcInfo,
bool& growUp) const=0;
bool& growUp) const {abort();}
virtual int getFirstOptionalOutgoingArgOffset (MachineFunction&,
bool& growUp) const=0;
bool& growUp) const {abort();}
virtual int getFirstAutomaticVarOffset (MachineFunction& mcInfo,
bool& growUp) const=0;
bool& growUp) const {abort();}
virtual int getRegSpillAreaOffset (MachineFunction& mcInfo,
bool& growUp) const=0;
bool& growUp) const {abort();}
virtual int getTmpAreaOffset (MachineFunction& mcInfo,
bool& growUp) const=0;
bool& growUp) const {abort();}
virtual int getDynamicAreaOffset (MachineFunction& mcInfo,
bool& growUp) const=0;
bool& growUp) const {abort();}
//
// 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;
virtual int getIncomingArgBaseRegNum() const { abort(); }
virtual int getOutgoingArgBaseRegNum() const { abort(); }
virtual int getOptionalOutgoingArgBaseRegNum() const { abort(); }
virtual int getAutomaticVarBaseRegNum() const { abort(); }
virtual int getRegSpillAreaBaseRegNum() const { abort(); }
virtual int getDynamicAreaBaseRegNum() const { abort(); }
};
#endif