xpcom/reflect/xptinfo/xptiTypelibGuts.cpp
author Andrew McCreight <continuation@gmail.com>
Tue, 27 Feb 2018 15:08:42 -0800
changeset 462073 6b7e0ca809e9f414d2832f026512184aa5b96be1
parent 462072 031309abee2cf74705007a7635dc07f1b5816919
child 462303 e1641b8d914d5cadcf9716b8dcaa6a08745fed6c
permissions -rw-r--r--
Bug 1442363, part 2 - Constify XPTHeader::interface_directory. r=njn MozReview-Commit-ID: 3oLZFtXBsV8

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */

/* Implementation of xptiTypelibGuts. */

#include "xptiprivate.h"
#include "xpt_arena.h"
#include "mozilla/XPTInterfaceInfoManager.h"

using namespace mozilla;

// Ensure through static analysis that xptiTypelibGuts won't have a vtable.
template <class T>
class MOZ_NEEDS_NO_VTABLE_TYPE CheckNoVTable
{
};
CheckNoVTable<xptiTypelibGuts> gChecker;

// static
xptiTypelibGuts*
xptiTypelibGuts::Create(const XPTHeader* aHeader)
{
    NS_ASSERTION(aHeader, "bad param");
    size_t n = sizeof(xptiTypelibGuts) +
               sizeof(xptiInterfaceEntry*) * (aHeader->num_interfaces - 1);
    void* place = XPT_CALLOC8(gXPTIStructArena, n);
    if (!place)
        return nullptr;
    return new(place) xptiTypelibGuts(aHeader);
}

xptiInterfaceEntry*
xptiTypelibGuts::GetEntryAt(uint16_t i)
{
    static const nsID zeroIID =
        { 0x0, 0x0, 0x0, { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 } };

    NS_ASSERTION(mHeader, "bad state");
    NS_ASSERTION(i < GetEntryCount(), "bad index");

    xptiInterfaceEntry* r = mEntryArray[i];
    if (r)
        return r;

    const XPTInterfaceDirectoryEntry* iface = mHeader->interface_directory + i;

    XPTInterfaceInfoManager::xptiWorkingSet& set =
        XPTInterfaceInfoManager::GetSingleton()->mWorkingSet;

    {
        ReentrantMonitorAutoEnter monitor(set.mTableReentrantMonitor);
        if (iface->iid.Equals(zeroIID))
            r = set.mNameTable.Get(iface->name);
        else
            r = set.mIIDTable.Get(iface->iid);
    }

    if (r)
        SetEntryAt(i, r);

    return r;
}

const char*
xptiTypelibGuts::GetEntryNameAt(uint16_t i)
{
    NS_ASSERTION(mHeader, "bad state");
    NS_ASSERTION(i < GetEntryCount(), "bad index");

    const XPTInterfaceDirectoryEntry* iface = mHeader->interface_directory + i;

    return iface->name;
}