forked from OSchip/llvm-project
175 lines
7.5 KiB
C++
175 lines
7.5 KiB
C++
//===-- SparcV9FrameInfo.h - Define TargetFrameInfo for SparcV9 -*- 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 stack frame layout info for the UltraSPARC.
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// Starting offsets for each area of the stack frame are aligned at
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// a multiple of getStackFrameSizeAlignment().
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//
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//----------------------------------------------------------------------------
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#ifndef SPARC_FRAMEINFO_H
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#define SPARC_FRAMEINFO_H
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#include "llvm/Target/TargetFrameInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "SparcV9RegInfo.h"
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namespace llvm {
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class SparcV9FrameInfo: public TargetFrameInfo {
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const TargetMachine ⌖
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public:
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SparcV9FrameInfo(const TargetMachine &TM)
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: TargetFrameInfo(StackGrowsDown, StackFrameSizeAlignment, 0), target(TM) {}
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public:
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// These methods provide constant parameters of the frame layout.
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//
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int getStackFrameSizeAlignment() const { return StackFrameSizeAlignment;}
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int getMinStackFrameSize() const { return MinStackFrameSize; }
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int getNumFixedOutgoingArgs() const { return NumFixedOutgoingArgs; }
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int getSizeOfEachArgOnStack() const { return SizeOfEachArgOnStack; }
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bool argsOnStackHaveFixedSize() const { return true; }
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// This method adjusts a stack offset to meet alignment rules of target.
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// The fixed OFFSET (0x7ff) must be subtracted and the result aligned.
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virtual int adjustAlignment(int unalignedOffset, bool growUp,
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unsigned int align) const {
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return unalignedOffset + (growUp? +1:-1)*((unalignedOffset-OFFSET) % align);
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}
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// These methods compute offsets using the frame contents for a
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// particular function. The frame contents are obtained from the
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// MachineCodeInfoForMethod object for the given function.
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//
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int getFirstIncomingArgOffset(MachineFunction& mcInfo, bool& growUp) const {
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growUp = true; // arguments area grows upwards
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return FirstIncomingArgOffsetFromFP;
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}
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int getFirstOutgoingArgOffset(MachineFunction& mcInfo, bool& growUp) const {
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growUp = true; // arguments area grows upwards
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return FirstOutgoingArgOffsetFromSP;
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}
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int getFirstOptionalOutgoingArgOffset(MachineFunction& mcInfo,
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bool& growUp) const {
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growUp = true; // arguments area grows upwards
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return FirstOptionalOutgoingArgOffsetFromSP;
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}
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int getFirstAutomaticVarOffset(MachineFunction& mcInfo, bool& growUp) const;
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int getRegSpillAreaOffset(MachineFunction& mcInfo, bool& growUp) const;
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int getTmpAreaOffset(MachineFunction& mcInfo, bool& growUp) const;
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int getDynamicAreaOffset(MachineFunction& mcInfo, bool& growUp) const;
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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 {
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return (int) target.getRegInfo()->getFramePointer();
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}
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virtual int getOutgoingArgBaseRegNum() const {
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return (int) target.getRegInfo()->getStackPointer();
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}
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virtual int getOptionalOutgoingArgBaseRegNum() const {
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return (int) target.getRegInfo()->getStackPointer();
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}
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virtual int getAutomaticVarBaseRegNum() const {
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return (int) target.getRegInfo()->getFramePointer();
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}
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virtual int getRegSpillAreaBaseRegNum() const {
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return (int) target.getRegInfo()->getFramePointer();
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}
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virtual int getDynamicAreaBaseRegNum() const {
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return (int) target.getRegInfo()->getStackPointer();
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}
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virtual int getIncomingArgOffset(MachineFunction& mcInfo,
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unsigned argNum) const {
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assert(argsOnStackHaveFixedSize());
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unsigned relativeOffset = argNum * getSizeOfEachArgOnStack();
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bool growUp; // do args grow up or down
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int firstArg = getFirstIncomingArgOffset(mcInfo, growUp);
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return growUp ? firstArg + relativeOffset : firstArg - relativeOffset;
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}
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virtual int getOutgoingArgOffset(MachineFunction& mcInfo,
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unsigned argNum) const {
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assert(argsOnStackHaveFixedSize());
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//assert(((int) argNum - this->getNumFixedOutgoingArgs())
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// <= (int) mcInfo.getInfo()->getMaxOptionalNumArgs());
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unsigned relativeOffset = argNum * getSizeOfEachArgOnStack();
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bool growUp; // do args grow up or down
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int firstArg = getFirstOutgoingArgOffset(mcInfo, growUp);
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return growUp ? firstArg + relativeOffset : firstArg - relativeOffset;
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}
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private:
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/*----------------------------------------------------------------------
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This diagram shows the stack frame layout used by llc on SparcV9 V9.
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Note that only the location of automatic variables, spill area,
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temporary storage, and dynamically allocated stack area are chosen
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by us. The rest conform to the SparcV9 V9 ABI.
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All stack addresses are offset by OFFSET = 0x7ff (2047).
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Alignment assumptions and other invariants:
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(1) %sp+OFFSET and %fp+OFFSET are always aligned on 16-byte boundary
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(2) Variables in automatic, spill, temporary, or dynamic regions
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are aligned according to their size as in all memory accesses.
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(3) Everything below the dynamically allocated stack area is only used
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during a call to another function, so it is never needed when
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the current function is active. This is why space can be allocated
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dynamically by incrementing %sp any time within the function.
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STACK FRAME LAYOUT:
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...
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%fp+OFFSET+176 Optional extra incoming arguments# 1..N
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%fp+OFFSET+168 Incoming argument #6
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... ...
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%fp+OFFSET+128 Incoming argument #1
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... ...
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---%fp+OFFSET-0--------Bottom of caller's stack frame--------------------
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%fp+OFFSET-8 Automatic variables <-- ****TOP OF STACK FRAME****
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Spill area
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Temporary storage
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...
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%sp+OFFSET+176+8N Bottom of dynamically allocated stack area
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%sp+OFFSET+168+8N Optional extra outgoing argument# N
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... ...
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%sp+OFFSET+176 Optional extra outgoing argument# 1
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%sp+OFFSET+168 Outgoing argument #6
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... ...
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%sp+OFFSET+128 Outgoing argument #1
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%sp+OFFSET+120 Save area for %i7
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... ...
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%sp+OFFSET+0 Save area for %l0 <-- ****BOTTOM OF STACK FRAME****
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*----------------------------------------------------------------------*/
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// All stack addresses must be offset by 0x7ff (2047) on SparcV9 V9.
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static const int OFFSET = (int) 0x7ff;
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static const int StackFrameSizeAlignment = 16;
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static const int MinStackFrameSize = 176;
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static const int NumFixedOutgoingArgs = 6;
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static const int SizeOfEachArgOnStack = 8;
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static const int FirstIncomingArgOffsetFromFP = 128 + OFFSET;
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static const int FirstOptionalIncomingArgOffsetFromFP = 176 + OFFSET;
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static const int StaticAreaOffsetFromFP = 0 + OFFSET;
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static const int FirstOutgoingArgOffsetFromSP = 128 + OFFSET;
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static const int FirstOptionalOutgoingArgOffsetFromSP = 176 + OFFSET;
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};
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} // End llvm namespace
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#endif
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