ager@chromium.org | 9258b6b | 2008-09-11 09:11:10 +0000 | [diff] [blame] | 1 | // Copyright 2006-2008 the V8 project authors. All rights reserved. |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 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 | |
| 29 | #ifndef V8_HANDLES_INL_H_ |
| 30 | #define V8_HANDLES_INL_H_ |
| 31 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 32 | #include "api.h" |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 33 | #include "apiutils.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 34 | #include "handles.h" |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 35 | #include "isolate.h" |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 36 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 37 | namespace v8 { |
| 38 | namespace internal { |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 39 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 40 | inline Isolate* GetIsolateForHandle(Object* obj) { |
| 41 | return Isolate::Current(); |
| 42 | } |
| 43 | |
| 44 | inline Isolate* GetIsolateForHandle(HeapObject* obj) { |
| 45 | return obj->GetIsolate(); |
| 46 | } |
| 47 | |
vegorov@chromium.org | 5d6c1f5 | 2011-02-28 13:13:38 +0000 | [diff] [blame] | 48 | template<typename T> |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 49 | Handle<T>::Handle(T* obj) { |
ager@chromium.org | 3bf7b91 | 2008-11-17 09:09:45 +0000 | [diff] [blame] | 50 | ASSERT(!obj->IsFailure()); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 51 | location_ = HandleScope::CreateHandle(obj, GetIsolateForHandle(obj)); |
| 52 | } |
| 53 | |
| 54 | |
| 55 | template<typename T> |
| 56 | Handle<T>::Handle(T* obj, Isolate* isolate) { |
| 57 | ASSERT(!obj->IsFailure()); |
| 58 | location_ = HandleScope::CreateHandle(obj, isolate); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | |
vegorov@chromium.org | 5d6c1f5 | 2011-02-28 13:13:38 +0000 | [diff] [blame] | 62 | template <typename T> |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 63 | inline T* Handle<T>::operator*() const { |
| 64 | ASSERT(location_ != NULL); |
| 65 | ASSERT(reinterpret_cast<Address>(*location_) != kHandleZapValue); |
vegorov@chromium.org | 26c16f8 | 2010-08-11 13:41:03 +0000 | [diff] [blame] | 66 | return *BitCast<T**>(location_); |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 70 | HandleScope::HandleScope() { |
| 71 | Isolate* isolate = Isolate::Current(); |
| 72 | v8::ImplementationUtilities::HandleScopeData* current = |
| 73 | isolate->handle_scope_data(); |
| 74 | isolate_ = isolate; |
| 75 | prev_next_ = current->next; |
| 76 | prev_limit_ = current->limit; |
| 77 | current->level++; |
| 78 | } |
| 79 | |
| 80 | |
| 81 | HandleScope::HandleScope(Isolate* isolate) { |
| 82 | ASSERT(isolate == Isolate::Current()); |
| 83 | v8::ImplementationUtilities::HandleScopeData* current = |
| 84 | isolate->handle_scope_data(); |
| 85 | isolate_ = isolate; |
| 86 | prev_next_ = current->next; |
| 87 | prev_limit_ = current->limit; |
| 88 | current->level++; |
| 89 | } |
| 90 | |
| 91 | |
| 92 | HandleScope::~HandleScope() { |
| 93 | CloseScope(); |
| 94 | } |
| 95 | |
| 96 | void HandleScope::CloseScope() { |
| 97 | ASSERT(isolate_ == Isolate::Current()); |
| 98 | v8::ImplementationUtilities::HandleScopeData* current = |
| 99 | isolate_->handle_scope_data(); |
| 100 | current->next = prev_next_; |
| 101 | current->level--; |
| 102 | if (current->limit != prev_limit_) { |
| 103 | current->limit = prev_limit_; |
| 104 | DeleteExtensions(isolate_); |
| 105 | } |
| 106 | #ifdef DEBUG |
| 107 | ZapRange(prev_next_, prev_limit_); |
| 108 | #endif |
| 109 | } |
| 110 | |
| 111 | |
| 112 | template <typename T> |
| 113 | Handle<T> HandleScope::CloseAndEscape(Handle<T> handle_value) { |
| 114 | T* value = *handle_value; |
| 115 | // Throw away all handles in the current scope. |
| 116 | CloseScope(); |
| 117 | v8::ImplementationUtilities::HandleScopeData* current = |
| 118 | isolate_->handle_scope_data(); |
| 119 | // Allocate one handle in the parent scope. |
| 120 | ASSERT(current->level > 0); |
| 121 | Handle<T> result(CreateHandle<T>(value, isolate_)); |
| 122 | // Reinitialize the current scope (so that it's ready |
| 123 | // to be used or closed again). |
| 124 | prev_next_ = current->next; |
| 125 | prev_limit_ = current->limit; |
| 126 | current->level++; |
| 127 | return result; |
| 128 | } |
| 129 | |
| 130 | |
| 131 | template <typename T> |
| 132 | T** HandleScope::CreateHandle(T* value, Isolate* isolate) { |
| 133 | ASSERT(isolate == Isolate::Current()); |
| 134 | v8::ImplementationUtilities::HandleScopeData* current = |
| 135 | isolate->handle_scope_data(); |
| 136 | |
| 137 | internal::Object** cur = current->next; |
| 138 | if (cur == current->limit) cur = Extend(); |
| 139 | // Update the current next field, set the value in the created |
| 140 | // handle, and return the result. |
| 141 | ASSERT(cur < current->limit); |
| 142 | current->next = cur + 1; |
| 143 | |
| 144 | T** result = reinterpret_cast<T**>(cur); |
| 145 | *result = value; |
| 146 | return result; |
| 147 | } |
| 148 | |
| 149 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 150 | #ifdef DEBUG |
| 151 | inline NoHandleAllocation::NoHandleAllocation() { |
ager@chromium.org | ddb913d | 2009-01-27 10:01:48 +0000 | [diff] [blame] | 152 | v8::ImplementationUtilities::HandleScopeData* current = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 153 | Isolate::Current()->handle_scope_data(); |
| 154 | |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 155 | // Shrink the current handle scope to make it impossible to do |
| 156 | // handle allocations without an explicit handle scope. |
| 157 | current->limit = current->next; |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 158 | |
| 159 | level_ = current->level; |
| 160 | current->level = 0; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 161 | } |
| 162 | |
| 163 | |
| 164 | inline NoHandleAllocation::~NoHandleAllocation() { |
| 165 | // Restore state in current handle scope to re-enable handle |
| 166 | // allocations. |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 167 | v8::ImplementationUtilities::HandleScopeData* data = |
| 168 | Isolate::Current()->handle_scope_data(); |
| 169 | ASSERT_EQ(0, data->level); |
| 170 | data->level = level_; |
christian.plesner.hansen | 43d26ec | 2008-07-03 15:10:15 +0000 | [diff] [blame] | 171 | } |
| 172 | #endif |
| 173 | |
| 174 | |
| 175 | } } // namespace v8::internal |
| 176 | |
| 177 | #endif // V8_HANDLES_INL_H_ |