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77 lines
3.4 KiB
C++
77 lines
3.4 KiB
C++
//===-- llvm/CodeGen/MachineFrameInfo.h -------------------------*- C++ -*-===//
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//
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// Interface to layout of stack frame on target machine.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_FRAMEINFO_H
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#define LLVM_CODEGEN_FRAMEINFO_H
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#include "Support/NonCopyable.h"
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#include <vector>
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class MachineFunction;
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class TargetMachine;
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struct MachineFrameInfo : public NonCopyableV {
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const TargetMachine ⌖
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public:
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MachineFrameInfo(const TargetMachine& tgt) : target(tgt) {}
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// These methods provide constant parameters of the frame layout.
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//
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virtual int getStackFrameSizeAlignment () const = 0;
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virtual int getMinStackFrameSize () const = 0;
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virtual int getNumFixedOutgoingArgs () const = 0;
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virtual int getSizeOfEachArgOnStack () const = 0;
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virtual bool argsOnStackHaveFixedSize () const = 0;
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// This method adjusts a stack offset to meet alignment rules of target.
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//
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virtual int adjustAlignment (int unalignedOffset,
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bool growUp,
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unsigned int align) const {
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return unalignedOffset + (growUp? +1:-1)*(unalignedOffset % align);
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}
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// These methods compute offsets using the frame contents for a
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// particular method. The frame contents are obtained from the
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// MachineCodeInfoForMethod object for the given method.
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// The first few methods have default machine-independent implementations.
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// The rest must be implemented by the 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 getFirstIncomingArgOffset (MachineFunction& mcInfo,
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bool& growUp) const=0;
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virtual int getFirstOutgoingArgOffset (MachineFunction& mcInfo,
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bool& growUp) const=0;
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virtual int getFirstOptionalOutgoingArgOffset (MachineFunction&,
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bool& growUp) const=0;
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virtual int getFirstAutomaticVarOffset (MachineFunction& mcInfo,
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bool& growUp) const=0;
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virtual int getRegSpillAreaOffset (MachineFunction& mcInfo,
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bool& growUp) const=0;
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virtual int getTmpAreaOffset (MachineFunction& mcInfo,
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bool& growUp) const=0;
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virtual int getDynamicAreaOffset (MachineFunction& mcInfo,
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bool& growUp) const=0;
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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=0;
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virtual int getOutgoingArgBaseRegNum() const=0;
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virtual int getOptionalOutgoingArgBaseRegNum() const=0;
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virtual int getAutomaticVarBaseRegNum() const=0;
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virtual int getRegSpillAreaBaseRegNum() const=0;
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virtual int getDynamicAreaBaseRegNum() const=0;
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};
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#endif
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