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      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 
     35 namespace v8 {
     36 namespace internal {
     37 
     38 
     39 AssertNoZoneAllocation::AssertNoZoneAllocation()
     40     : prev_(Isolate::Current()->zone_allow_allocation()) {
     41   Isolate::Current()->set_zone_allow_allocation(false);
     42 }
     43 
     44 
     45 AssertNoZoneAllocation::~AssertNoZoneAllocation() {
     46   Isolate::Current()->set_zone_allow_allocation(prev_);
     47 }
     48 
     49 
     50 inline 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 
     67 template <typename T>
     68 T* Zone::NewArray(int length) {
     69   return static_cast<T*>(New(length * sizeof(T)));
     70 }
     71 
     72 
     73 bool Zone::excess_allocation() {
     74   return segment_bytes_allocated_ > zone_excess_limit_;
     75 }
     76 
     77 
     78 void 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 
     84 template <typename Config>
     85 ZoneSplayTree<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.
     96 void* ZoneObject::operator new(size_t size) {
     97   return ZONE->New(static_cast<int>(size));
     98 }
     99 
    100 void* ZoneObject::operator new(size_t size, Zone* zone) {
    101   return zone->New(static_cast<int>(size));
    102 }
    103 
    104 
    105 inline void* ZoneListAllocationPolicy::New(int size) {
    106   return ZONE->New(size);
    107 }
    108 
    109 
    110 ZoneScope::ZoneScope(ZoneScopeMode mode)
    111     : isolate_(Isolate::Current()),
    112       mode_(mode) {
    113   isolate_->zone()->scope_nesting_++;
    114 }
    115 
    116 
    117 bool ZoneScope::ShouldDeleteOnExit() {
    118   return isolate_->zone()->scope_nesting_ == 1 && mode_ == DELETE_ON_EXIT;
    119 }
    120 
    121 
    122 int ZoneScope::nesting() {
    123   return Isolate::Current()->zone()->scope_nesting_;
    124 }
    125 
    126 
    127 } }  // namespace v8::internal
    128 
    129 #endif  // V8_ZONE_INL_H_
    130