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109 lines
4.3 KiB
C++
109 lines
4.3 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 <utility>
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namespace llvm {
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class MachineFunction;
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/// Information about stack frame layout on the target. It holds the direction
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/// of stack growth, the known stack alignment on entry to each function, and
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/// the offset to the locals area.
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///
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/// The offset to the local area is the offset from the stack pointer on
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/// function entry to the first location where function data (local variables,
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/// spill locations) can be stored.
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class TargetFrameInfo {
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public:
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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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/// getCalleeSaveSpillSlots - This method returns a pointer to an array of
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/// pairs, that contains an entry for each callee save register that must be
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/// spilled to a particular stack location if it is spilled.
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///
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/// Each entry in this array contains a <register,offset> pair, indicating the
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/// fixed offset from the incoming stack pointer that each register should be
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/// spilled at. If a register is not listed here, the code generator is
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/// allowed to spill it anywhere it chooses.
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///
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virtual const std::pair<unsigned, int> *
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getCalleeSaveSpillSlots(unsigned &NumEntries) const {
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NumEntries = 0;
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return 0;
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}
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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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// 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;
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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;
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virtual int getOutgoingArgOffset (MachineFunction& mcInfo,
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unsigned argNum) const;
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virtual int getFirstAutomaticVarOffset (MachineFunction& mcInfo,
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bool& growUp) const;
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virtual int getRegSpillAreaOffset (MachineFunction& mcInfo,
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bool& growUp) const;
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virtual int getTmpAreaOffset (MachineFunction& mcInfo,
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bool& growUp) const;
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virtual int getDynamicAreaOffset (MachineFunction& mcInfo,
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bool& growUp) const;
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};
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} // End llvm namespace
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#endif
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