//===-- llvm/Target/TargetFrameInfo.h ---------------------------*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
// Interface to describe the layout of a stack frame on the target machine.
#ifndef LLVM_TARGET_TARGETFRAMEINFO_H
#define LLVM_TARGET_TARGETFRAMEINFO_H
+#include <utility>
+
+namespace llvm {
+
class MachineFunction;
-struct TargetFrameInfo {
+/// Information about stack frame layout on the target. It holds the direction
+/// of stack growth, the known stack alignment on entry to each function, and
+/// the offset to the locals area.
+///
+/// The offset to the local area is the offset from the stack pointer on
+/// function entry to the first location where function data (local variables,
+/// spill locations) can be stored.
+class TargetFrameInfo {
+public:
enum StackDirection {
StackGrowsUp, // Adding to the stack increases the stack address
StackGrowsDown // Adding to the stack decreases the stack address
TargetFrameInfo(StackDirection D, unsigned StackAl, int LAO)
: StackDir(D), StackAlignment(StackAl), LocalAreaOffset(LAO) {}
+ virtual ~TargetFrameInfo();
+
// These methods return information that describes the abstract stack layout
// of the target machine.
///
int getOffsetOfLocalArea() const { return LocalAreaOffset; }
+ /// getCalleeSaveSpillSlots - This method returns a pointer to an array of
+ /// pairs, that contains an entry for each callee save register that must be
+ /// spilled to a particular stack location if it is spilled.
+ ///
+ /// Each entry in this array contains a <register,offset> pair, indicating the
+ /// fixed offset from the incoming stack pointer that each register should be
+ /// spilled at. If a register is not listed here, the code generator is
+ /// allowed to spill it anywhere it chooses.
+ ///
+ virtual const std::pair<unsigned, int> *
+ getCalleeSaveSpillSlots(unsigned &NumEntries) const {
+ NumEntries = 0;
+ return 0;
+ }
+
//===--------------------------------------------------------------------===//
// 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 align) const { abort(); }
+ unsigned align) const;
// 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{abort();}
- virtual int getOutgoingArgOffset (MachineFunction& mcInfo,
- unsigned argNum)const{abort();}
-
- virtual int getFirstIncomingArgOffset (MachineFunction& mcInfo,
- bool& growUp) const { abort();}
- virtual int getFirstOutgoingArgOffset (MachineFunction& mcInfo,
- bool& growUp) const {abort();}
- virtual int getFirstOptionalOutgoingArgOffset (MachineFunction&,
- bool& growUp) const {abort();}
- virtual int getFirstAutomaticVarOffset (MachineFunction& mcInfo,
- bool& growUp) const {abort();}
- virtual int getRegSpillAreaOffset (MachineFunction& mcInfo,
- bool& growUp) const {abort();}
- virtual int getTmpAreaOffset (MachineFunction& mcInfo,
- bool& growUp) const {abort();}
- virtual int getDynamicAreaOffset (MachineFunction& mcInfo,
- bool& growUp) const {abort();}
-
//
- // These methods specify the base register used for each stack area
- // (generally FP or SP)
- //
- 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(); }
+ virtual int getIncomingArgOffset(MachineFunction& mcInfo,
+ unsigned argNum) const;
+ virtual int getOutgoingArgOffset(MachineFunction& mcInfo,
+ unsigned argNum) const;
+ virtual int getFirstAutomaticVarOffset(MachineFunction& mcInfo,
+ bool& growUp) const;
+ virtual int getRegSpillAreaOffset(MachineFunction& mcInfo,
+ bool& growUp) const;
+ virtual int getTmpAreaOffset(MachineFunction& mcInfo, bool& growUp) const;
+ virtual int getDynamicAreaOffset(MachineFunction& mcInfo, bool& growUp) const;
};
+} // End llvm namespace
+
#endif