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//===-- SparcV9FrameInfo.cpp - Stack frame layout info for SparcV9 --------===//
//
// 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 stack frame layout info for the UltraSPARC. Starting offsets
// for each area of the stack frame are aligned at a multiple of
// getStackFrameSizeAlignment().
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionInfo.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "SparcV9FrameInfo.h"
using namespace llvm;
int
SparcV9FrameInfo::getFirstAutomaticVarOffset(MachineFunction&, bool& pos) const {
pos = false; // static stack area grows downwards
return StaticAreaOffsetFromFP;
}
int
SparcV9FrameInfo::getRegSpillAreaOffset(MachineFunction& mcInfo, bool& pos) const
{
// ensure no more auto vars are added
mcInfo.getInfo()->freezeAutomaticVarsArea();
pos = false; // static stack area grows downwards
unsigned autoVarsSize = mcInfo.getInfo()->getAutomaticVarsSize();
return StaticAreaOffsetFromFP - autoVarsSize;
}
int SparcV9FrameInfo::getTmpAreaOffset(MachineFunction& mcInfo, bool& pos) const {
MachineFunctionInfo *MFI = mcInfo.getInfo();
MFI->freezeAutomaticVarsArea(); // ensure no more auto vars are added
MFI->freezeSpillsArea(); // ensure no more spill slots are added
pos = false; // static stack area grows downwards
unsigned autoVarsSize = MFI->getAutomaticVarsSize();
unsigned spillAreaSize = MFI->getRegSpillsSize();
int offset = autoVarsSize + spillAreaSize;
return StaticAreaOffsetFromFP - offset;
}
int
SparcV9FrameInfo::getDynamicAreaOffset(MachineFunction& mcInfo, bool& pos) const {
// Dynamic stack area grows downwards starting at top of opt-args area.
// The opt-args, required-args, and register-save areas are empty except
// during calls and traps, so they are shifted downwards on each
// dynamic-size alloca.
pos = false;
unsigned optArgsSize = mcInfo.getInfo()->getMaxOptionalArgsSize();
if (int extra = optArgsSize % getStackFrameSizeAlignment())
optArgsSize += (getStackFrameSizeAlignment() - extra);
int offset = optArgsSize + FirstOptionalOutgoingArgOffsetFromSP;
assert((offset - OFFSET) % getStackFrameSizeAlignment() == 0);
return offset;
}
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