js/src/vm/StringObject.h@6474c204b198 (annotated)
js/src/vm/StringObject.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- |
| michael@0 | 2 | * vim: set ts=8 sts=4 et sw=4 tw=99: |
| michael@0 | 3 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 6 | |
| michael@0 | 7 | #ifndef vm_StringObject_h |
| michael@0 | 8 | #define vm_StringObject_h |
| michael@0 | 9 | |
| michael@0 | 10 | #include "jsobj.h" |
| michael@0 | 11 | #include "jsstr.h" |
| michael@0 | 12 | |
| michael@0 | 13 | #include "vm/Shape.h" |
| michael@0 | 14 | |
| michael@0 | 15 | namespace js { |
| michael@0 | 16 | |
| michael@0 | 17 | class StringObject : public JSObject |
| michael@0 | 18 | { |
| michael@0 | 19 | static const unsigned PRIMITIVE_VALUE_SLOT = 0; |
| michael@0 | 20 | static const unsigned LENGTH_SLOT = 1; |
| michael@0 | 21 | |
| michael@0 | 22 | public: |
| michael@0 | 23 | static const unsigned RESERVED_SLOTS = 2; |
| michael@0 | 24 | |
| michael@0 | 25 | static const Class class_; |
| michael@0 | 26 | |
| michael@0 | 27 | /* |
| michael@0 | 28 | * Creates a new String object boxing the given string. The object's |
| michael@0 | 29 | * [[Prototype]] is determined from context. |
| michael@0 | 30 | */ |
| michael@0 | 31 | static inline StringObject *create(JSContext *cx, HandleString str, |
| michael@0 | 32 | NewObjectKind newKind = GenericObject); |
| michael@0 | 33 | |
| michael@0 | 34 | JSString *unbox() const { |
| michael@0 | 35 | return getFixedSlot(PRIMITIVE_VALUE_SLOT).toString(); |
| michael@0 | 36 | } |
| michael@0 | 37 | |
| michael@0 | 38 | inline size_t length() const { |
| michael@0 | 39 | return size_t(getFixedSlot(LENGTH_SLOT).toInt32()); |
| michael@0 | 40 | } |
| michael@0 | 41 | |
| michael@0 | 42 | static size_t offsetOfPrimitiveValue() { |
| michael@0 | 43 | return getFixedSlotOffset(PRIMITIVE_VALUE_SLOT); |
| michael@0 | 44 | } |
| michael@0 | 45 | static size_t offsetOfLength() { |
| michael@0 | 46 | return getFixedSlotOffset(LENGTH_SLOT); |
| michael@0 | 47 | } |
| michael@0 | 48 | |
| michael@0 | 49 | private: |
| michael@0 | 50 | inline bool init(JSContext *cx, HandleString str); |
| michael@0 | 51 | |
| michael@0 | 52 | void setStringThis(JSString *str) { |
| michael@0 | 53 | JS_ASSERT(getReservedSlot(PRIMITIVE_VALUE_SLOT).isUndefined()); |
| michael@0 | 54 | setFixedSlot(PRIMITIVE_VALUE_SLOT, StringValue(str)); |
| michael@0 | 55 | setFixedSlot(LENGTH_SLOT, Int32Value(int32_t(str->length()))); |
| michael@0 | 56 | } |
| michael@0 | 57 | |
| michael@0 | 58 | /* For access to init, as String.prototype is special. */ |
| michael@0 | 59 | friend JSObject * |
| michael@0 | 60 | ::js_InitStringClass(JSContext *cx, js::HandleObject global); |
| michael@0 | 61 | |
| michael@0 | 62 | /* For access to assignInitialShape. */ |
| michael@0 | 63 | friend bool |
| michael@0 | 64 | EmptyShape::ensureInitialCustomShape<StringObject>(ExclusiveContext *cx, |
| michael@0 | 65 | Handle<StringObject*> obj); |
| michael@0 | 66 | |
| michael@0 | 67 | /* |
| michael@0 | 68 | * Compute the initial shape to associate with fresh String objects, which |
| michael@0 | 69 | * encodes the initial length property. Return the shape after changing |
| michael@0 | 70 | * |obj|'s last property to it. |
| michael@0 | 71 | */ |
| michael@0 | 72 | static Shape * |
| michael@0 | 73 | assignInitialShape(ExclusiveContext *cx, Handle<StringObject*> obj); |
| michael@0 | 74 | }; |
| michael@0 | 75 | |
| michael@0 | 76 | } // namespace js |
| michael@0 | 77 | |
| michael@0 | 78 | #endif /* vm_StringObject_h */ |
