74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef vm_StringObject_h
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#define vm_StringObject_h
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#include "jsobj.h"
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#include "jsstr.h"
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#include "vm/Shape.h"
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namespace js {
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class StringObject : public NativeObject
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{
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static const unsigned PRIMITIVE_VALUE_SLOT = 0;
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static const unsigned LENGTH_SLOT = 1;
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public:
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static const unsigned RESERVED_SLOTS = 2;
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static const Class class_;
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/*
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* Creates a new String object boxing the given string. The object's
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* [[Prototype]] is determined from context.
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*/
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static inline StringObject* create(JSContext* cx, HandleString str,
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HandleObject proto = nullptr,
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NewObjectKind newKind = GenericObject);
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/*
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* Compute the initial shape to associate with fresh String objects, which
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* encodes the initial length property. Return the shape after changing
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* |obj|'s last property to it.
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*/
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static Shape*
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assignInitialShape(ExclusiveContext* cx, Handle<StringObject*> obj);
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JSString* unbox() const {
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return getFixedSlot(PRIMITIVE_VALUE_SLOT).toString();
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}
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inline size_t length() const {
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return size_t(getFixedSlot(LENGTH_SLOT).toInt32());
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}
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static size_t offsetOfPrimitiveValue() {
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return getFixedSlotOffset(PRIMITIVE_VALUE_SLOT);
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}
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static size_t offsetOfLength() {
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return getFixedSlotOffset(LENGTH_SLOT);
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}
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private:
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static inline bool init(JSContext* cx, Handle<StringObject*> obj, HandleString str);
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void setStringThis(JSString* str) {
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MOZ_ASSERT(getReservedSlot(PRIMITIVE_VALUE_SLOT).isUndefined());
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setFixedSlot(PRIMITIVE_VALUE_SLOT, StringValue(str));
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setFixedSlot(LENGTH_SLOT, Int32Value(int32_t(str->length())));
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}
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/* For access to init, as String.prototype is special. */
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friend JSObject*
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js::InitStringClass(JSContext* cx, HandleObject global);
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};
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} // namespace js
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#endif /* vm_StringObject_h */
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