1// Copyright 2011 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28#ifndef V8_ZONE_INL_H_ 29#define V8_ZONE_INL_H_ 30 31#include "isolate.h" 32#include "zone.h" 33#include "v8-counters.h" 34 35namespace v8 { 36namespace internal { 37 38 39AssertNoZoneAllocation::AssertNoZoneAllocation() 40 : prev_(Isolate::Current()->zone_allow_allocation()) { 41 Isolate::Current()->set_zone_allow_allocation(false); 42} 43 44 45AssertNoZoneAllocation::~AssertNoZoneAllocation() { 46 Isolate::Current()->set_zone_allow_allocation(prev_); 47} 48 49 50inline void* Zone::New(int size) { 51 ASSERT(Isolate::Current()->zone_allow_allocation()); 52 ASSERT(ZoneScope::nesting() > 0); 53 // Round up the requested size to fit the alignment. 54 size = RoundUp(size, kAlignment); 55 56 // Check if the requested size is available without expanding. 57 Address result = position_; 58 if ((position_ += size) > limit_) result = NewExpand(size); 59 60 // Check that the result has the proper alignment and return it. 61 ASSERT(IsAddressAligned(result, kAlignment, 0)); 62 allocation_size_ += size; 63 return reinterpret_cast<void*>(result); 64} 65 66 67template <typename T> 68T* Zone::NewArray(int length) { 69 return static_cast<T*>(New(length * sizeof(T))); 70} 71 72 73bool Zone::excess_allocation() { 74 return segment_bytes_allocated_ > zone_excess_limit_; 75} 76 77 78void Zone::adjust_segment_bytes_allocated(int delta) { 79 segment_bytes_allocated_ += delta; 80 isolate_->counters()->zone_segment_bytes()->Set(segment_bytes_allocated_); 81} 82 83 84template <typename Config> 85ZoneSplayTree<Config>::~ZoneSplayTree() { 86 // Reset the root to avoid unneeded iteration over all tree nodes 87 // in the destructor. For a zone-allocated tree, nodes will be 88 // freed by the Zone. 89 SplayTree<Config, ZoneListAllocationPolicy>::ResetRoot(); 90} 91 92 93// TODO(isolates): for performance reasons, this should be replaced with a new 94// operator that takes the zone in which the object should be 95// allocated. 96void* ZoneObject::operator new(size_t size) { 97 return ZONE->New(static_cast<int>(size)); 98} 99 100void* ZoneObject::operator new(size_t size, Zone* zone) { 101 return zone->New(static_cast<int>(size)); 102} 103 104 105inline void* ZoneListAllocationPolicy::New(int size) { 106 return ZONE->New(size); 107} 108 109 110ZoneScope::ZoneScope(ZoneScopeMode mode) 111 : isolate_(Isolate::Current()), 112 mode_(mode) { 113 isolate_->zone()->scope_nesting_++; 114} 115 116 117bool ZoneScope::ShouldDeleteOnExit() { 118 return isolate_->zone()->scope_nesting_ == 1 && mode_ == DELETE_ON_EXIT; 119} 120 121 122int ZoneScope::nesting() { 123 return Isolate::Current()->zone()->scope_nesting_; 124} 125 126 127} } // namespace v8::internal 128 129#endif // V8_ZONE_INL_H_ 130