src/third_party/mozjs-45/js/src/vm/ArgumentsObject-inl.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef vm_ArgumentsObject_inl_h
#define vm_ArgumentsObject_inl_h

#include "vm/ArgumentsObject.h"

#include "vm/ScopeObject.h"

#include "jsscriptinlines.h"

#include "vm/ScopeObject-inl.h"

namespace js {

inline const Value&
ArgumentsObject::element(uint32_t i) const
{
    MOZ_ASSERT(!isElementDeleted(i));
    const Value& v = data()->args[i];
    if (IsMagicScopeSlotValue(v)) {
        CallObject& callobj = getFixedSlot(MAYBE_CALL_SLOT).toObject().as<CallObject>();
        return callobj.aliasedVarFromArguments(v);
    }
    return v;
}

inline void
ArgumentsObject::setElement(JSContext* cx, uint32_t i, const Value& v)
{
    MOZ_ASSERT(!isElementDeleted(i));
    HeapValue& lhs = data()->args[i];
    if (IsMagicScopeSlotValue(lhs)) {
        uint32_t slot = SlotFromMagicScopeSlotValue(lhs);
        CallObject& callobj = getFixedSlot(MAYBE_CALL_SLOT).toObject().as<CallObject>();
        for (Shape::Range<NoGC> r(callobj.lastProperty()); !r.empty(); r.popFront()) {
            if (r.front().slot() == slot) {
                callobj.setAliasedVarFromArguments(cx, lhs, r.front().propid(), v);
                return;
            }
        }
        MOZ_CRASH("Bad Arguments::setElement");
    }
    lhs = v;
}

inline bool
ArgumentsObject::maybeGetElements(uint32_t start, uint32_t count, Value* vp)
{
    MOZ_ASSERT(start + count >= start);

    uint32_t length = initialLength();
    if (start > length || start + count > length || isAnyElementDeleted())
        return false;

    for (uint32_t i = start, end = start + count; i < end; ++i, ++vp)
        *vp = element(i);
    return true;
}

} /* namespace js */

#endif /* vm_ArgumentsObject_inl_h */