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58 lines
2.3 KiB
C++
58 lines
2.3 KiB
C++
//===-- SparcV9FrameInfo.cpp - Stack frame layout info for SparcV9 --------===//
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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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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/Target/TargetFrameInfo.h"
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#include "MachineFunctionInfo.h"
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#include "SparcV9FrameInfo.h"
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using namespace llvm;
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int
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SparcV9FrameInfo::getRegSpillAreaOffset(MachineFunction& mcInfo, bool& pos) const
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{
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// ensure no more auto vars are added
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mcInfo.getInfo<SparcV9FunctionInfo>()->freezeAutomaticVarsArea();
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pos = false; // static stack area grows downwards
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unsigned autoVarsSize = mcInfo.getInfo<SparcV9FunctionInfo>()->getAutomaticVarsSize();
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return StaticAreaOffsetFromFP - autoVarsSize;
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}
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int SparcV9FrameInfo::getTmpAreaOffset(MachineFunction& mcInfo, bool& pos) const {
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SparcV9FunctionInfo *MFI = mcInfo.getInfo<SparcV9FunctionInfo>();
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MFI->freezeAutomaticVarsArea(); // ensure no more auto vars are added
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MFI->freezeSpillsArea(); // ensure no more spill slots are added
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pos = false; // static stack area grows downwards
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unsigned autoVarsSize = MFI->getAutomaticVarsSize();
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unsigned spillAreaSize = MFI->getRegSpillsSize();
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int offset = autoVarsSize + spillAreaSize;
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return StaticAreaOffsetFromFP - offset;
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}
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int
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SparcV9FrameInfo::getDynamicAreaOffset(MachineFunction& mcInfo, bool& pos) const {
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// Dynamic stack area grows downwards starting at top of opt-args area.
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// The opt-args, required-args, and register-save areas are empty except
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// during calls and traps, so they are shifted downwards on each
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// dynamic-size alloca.
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pos = false;
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unsigned optArgsSize = mcInfo.getInfo<SparcV9FunctionInfo>()->getMaxOptionalArgsSize();
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if (int extra = optArgsSize % 16)
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optArgsSize += (16 - extra);
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int offset = optArgsSize + FirstOptionalOutgoingArgOffsetFromSP;
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assert((offset - OFFSET) % 16 == 0);
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return offset;
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}
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