/* * Copyright (C) 2012-2014, 2016 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #pragma once #if !ENABLE(JIT) #include "CLoopStack.h" #include "CallFrame.h" #include "CodeBlock.h" #include "VM.h" namespace JSC { inline bool CLoopStack::ensureCapacityFor(Register* newTopOfStack) { Register* newEnd = newTopOfStack - 1; if (newEnd >= m_end) return true; return grow(newTopOfStack); } inline Register* CLoopStack::topOfFrameFor(CallFrame* frame) { if (UNLIKELY(!frame)) return baseOfStack(); return frame->topOfFrame() - 1; } inline Register* CLoopStack::topOfStack() { return topOfFrameFor(m_topCallFrame); } inline void CLoopStack::shrink(Register* newTopOfStack) { Register* newEnd = newTopOfStack - 1; if (newEnd >= m_end) return; setCLoopStackLimit(newTopOfStack); // Note: Clang complains of an unresolved linkage to maxExcessCapacity if // invoke std::max() with it as an argument. To work around this, we first // assign the constant to a local variable, and use the local instead. ptrdiff_t maxExcessCapacity = CLoopStack::maxExcessCapacity; ptrdiff_t maxExcessInRegisters = std::max(maxExcessCapacity, m_softReservedZoneSizeInRegisters); if (m_end == baseOfStack() && (highAddress() - m_commitTop) >= maxExcessInRegisters) releaseExcessCapacity(); } inline void CLoopStack::setCLoopStackLimit(Register* newTopOfStack) { Register* newEnd = newTopOfStack - 1; m_end = newEnd; m_vm.setCLoopStackLimit(newTopOfStack); } } // namespace JSC #endif // !ENABLE(JIT)