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61eec1573a
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10941 91177308-0d34-0410-b5e6-96231b3b80d8
109 lines
4.6 KiB
C++
109 lines
4.6 KiB
C++
//===-- llvm/Target/TargetFrameInfo.h ---------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Interface to describe the layout of a stack frame on the target machine.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_TARGETFRAMEINFO_H
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#define LLVM_TARGET_TARGETFRAMEINFO_H
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#include <cstdlib>
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namespace llvm {
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class MachineFunction;
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struct TargetFrameInfo {
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enum StackDirection {
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StackGrowsUp, // Adding to the stack increases the stack address
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StackGrowsDown // Adding to the stack decreases the stack address
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};
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private:
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StackDirection StackDir;
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unsigned StackAlignment;
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int LocalAreaOffset;
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public:
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TargetFrameInfo(StackDirection D, unsigned StackAl, int LAO)
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: StackDir(D), StackAlignment(StackAl), LocalAreaOffset(LAO) {}
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// These methods return information that describes the abstract stack layout
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// of the target machine.
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/// getStackGrowthDirection - Return the direction the stack grows
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///
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StackDirection getStackGrowthDirection() const { return StackDir; }
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/// getStackAlignment - This method returns the number of bytes that the stack
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/// pointer must be aligned to. Typically, this is the largest alignment for
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/// any data object in the target.
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///
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unsigned getStackAlignment() const { return StackAlignment; }
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/// getOffsetOfLocalArea - This method returns the offset of the local area
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/// from the stack pointer on entrance to a function.
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///
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int getOffsetOfLocalArea() const { return LocalAreaOffset; }
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//===--------------------------------------------------------------------===//
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// These methods provide details of the stack frame used by Sparc, thus they
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// are Sparc specific.
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//===--------------------------------------------------------------------===//
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virtual int getStackFrameSizeAlignment () const { abort(); }
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virtual int getMinStackFrameSize () const { abort(); }
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virtual int getNumFixedOutgoingArgs () const { abort(); }
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virtual int getSizeOfEachArgOnStack () const { abort(); }
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virtual bool argsOnStackHaveFixedSize () const { abort(); }
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// This method adjusts a stack offset to meet alignment rules of target.
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virtual int adjustAlignment(int unalignedOffset, bool growUp,
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unsigned align) const { abort(); }
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// These methods compute offsets using the frame contents for a particular
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// function. The frame contents are obtained from the MachineFunction object
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// for the given function. The rest must be implemented by the
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// machine-specific subclass.
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//
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virtual int getIncomingArgOffset (MachineFunction& mcInfo,
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unsigned argNum)const{abort();}
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virtual int getOutgoingArgOffset (MachineFunction& mcInfo,
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unsigned argNum)const{abort();}
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virtual int getFirstIncomingArgOffset (MachineFunction& mcInfo,
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bool& growUp) const { abort();}
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virtual int getFirstOutgoingArgOffset (MachineFunction& mcInfo,
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bool& growUp) const {abort();}
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virtual int getFirstOptionalOutgoingArgOffset (MachineFunction&,
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bool& growUp) const {abort();}
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virtual int getFirstAutomaticVarOffset (MachineFunction& mcInfo,
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bool& growUp) const {abort();}
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virtual int getRegSpillAreaOffset (MachineFunction& mcInfo,
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bool& growUp) const {abort();}
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virtual int getTmpAreaOffset (MachineFunction& mcInfo,
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bool& growUp) const {abort();}
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virtual int getDynamicAreaOffset (MachineFunction& mcInfo,
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bool& growUp) const {abort();}
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//
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// These methods specify the base register used for each stack area
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// (generally FP or SP)
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//
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virtual int getIncomingArgBaseRegNum() const { abort(); }
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virtual int getOutgoingArgBaseRegNum() const { abort(); }
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virtual int getOptionalOutgoingArgBaseRegNum() const { abort(); }
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virtual int getAutomaticVarBaseRegNum() const { abort(); }
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virtual int getRegSpillAreaBaseRegNum() const { abort(); }
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virtual int getDynamicAreaBaseRegNum() const { abort(); }
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};
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} // End llvm namespace
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#endif
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