gecko-dev/js/jsd/jsd_obj.cpp

/* -*- 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/. */

/*
 * JavaScript Debugging support - Object support
 */

#include "jsd.h"

/*
* #define JSD_TRACE 1
*/

#ifdef JSD_TRACE
#define TRACEOBJ(jsdc, jsdobj, which) _traceObj(jsdc, jsdobj, which)

static char *
_describeObj(JSDContext* jsdc, JSDObject *jsdobj)
{
    return
        JS_smprintf("%0x new'd in %s at line %d using ctor %s in %s at line %d",
                    (int)jsdobj,
                    JSD_GetObjectNewURL(jsdc, jsdobj),
                    JSD_GetObjectNewLineNumber(jsdc, jsdobj),
                    JSD_GetObjectConstructorName(jsdc, jsdobj),
                    JSD_GetObjectConstructorURL(jsdc, jsdobj),
                    JSD_GetObjectConstructorLineNumber(jsdc, jsdobj));
}

static void
_traceObj(JSDContext* jsdc, JSDObject* jsdobj, int which)
{
    char* description;

    if( !jsdobj )
        return;

    description = _describeObj(jsdc, jsdobj);

    printf("%s : %s\n",
           which == 0 ? "new  " :
           which == 1 ? "final" :
                        "ctor ",
           description);
    if(description)
        free(description);
}
#else
#define TRACEOBJ(jsdc, jsdobj, which) ((void)0)
#endif /* JSD_TRACE */

#ifdef DEBUG
void JSD_ASSERT_VALID_OBJECT(JSDObject* jsdobj)
{
    MOZ_ASSERT(jsdobj);
    MOZ_ASSERT(!JS_CLIST_IS_EMPTY(&jsdobj->links));
    MOZ_ASSERT(jsdobj->obj);
}
#endif


static void
_destroyJSDObject(JSDContext* jsdc, JSDObject* jsdobj)
{
    MOZ_ASSERT(JSD_OBJECTS_LOCKED(jsdc));

    JS_REMOVE_LINK(&jsdobj->links);
    JS_HashTableRemove(jsdc->objectsTable, jsdobj->obj);

    if(jsdobj->newURL)
        jsd_DropAtom(jsdc, jsdobj->newURL);
    if(jsdobj->ctorURL)
        jsd_DropAtom(jsdc, jsdobj->ctorURL);
    if(jsdobj->ctorName)
        jsd_DropAtom(jsdc, jsdobj->ctorName);
    free(jsdobj);
}

void
jsd_Constructing(JSDContext* jsdc, JSContext *cx, JSObject *obj,
                 JSAbstractFramePtr frame)
{
    JSDObject* jsdobj;
    JS::RootedScript script(cx);
    JSDScript* jsdscript;
    const char* ctorURL;
    JSString* ctorNameStr;
    const char* ctorName;

    JSD_LOCK_OBJECTS(jsdc);
    jsdobj = jsd_GetJSDObjectForJSObject(jsdc, obj);
    if( jsdobj && !jsdobj->ctorURL )
    {
        script = frame.script();
        if( script )
        {
            ctorURL = JS_GetScriptFilename(cx, script);
            if( ctorURL )
                jsdobj->ctorURL = jsd_AddAtom(jsdc, ctorURL);

            JSD_LOCK_SCRIPTS(jsdc);
            jsdscript = jsd_FindOrCreateJSDScript(jsdc, cx, script, frame);
            JSD_UNLOCK_SCRIPTS(jsdc);
            if( jsdscript && (ctorNameStr = jsd_GetScriptFunctionId(jsdc, jsdscript)) ) {
                if( (ctorName = JS_EncodeString(cx, ctorNameStr)) ) {
                    jsdobj->ctorName = jsd_AddAtom(jsdc, ctorName);
                    JS_free(cx, (void *) ctorName);
                }
            }
            jsdobj->ctorLineno = JS_GetScriptBaseLineNumber(cx, script);
        }
    }
    TRACEOBJ(jsdc, jsdobj, 3);
    JSD_UNLOCK_OBJECTS(jsdc);
}

static JSHashNumber
_hash_root(const void *key)
{
    return ((JSHashNumber)(ptrdiff_t) key) >> 2; /* help lame MSVC1.5 on Win16 */
}

bool
jsd_InitObjectManager(JSDContext* jsdc)
{
    JS_INIT_CLIST(&jsdc->objectsList);
    jsdc->objectsTable = JS_NewHashTable(256, _hash_root,
                                         JS_CompareValues, JS_CompareValues,
                                         nullptr, nullptr);
    return !!jsdc->objectsTable;
}

void
jsd_DestroyObjectManager(JSDContext* jsdc)
{
    jsd_DestroyObjects(jsdc);
    JSD_LOCK_OBJECTS(jsdc);
    JS_HashTableDestroy(jsdc->objectsTable);
    JSD_UNLOCK_OBJECTS(jsdc);
}

void
jsd_DestroyObjects(JSDContext* jsdc)
{
    JSD_LOCK_OBJECTS(jsdc);
    while( !JS_CLIST_IS_EMPTY(&jsdc->objectsList) )
        _destroyJSDObject(jsdc, (JSDObject*)JS_NEXT_LINK(&jsdc->objectsList));
    JSD_UNLOCK_OBJECTS(jsdc);
}

JSDObject*
jsd_IterateObjects(JSDContext* jsdc, JSDObject** iterp)
{
    JSDObject *jsdobj = *iterp;

    MOZ_ASSERT(JSD_OBJECTS_LOCKED(jsdc));

    if( !jsdobj )
        jsdobj = (JSDObject *)jsdc->objectsList.next;
    if( jsdobj == (JSDObject *)&jsdc->objectsList )
        return nullptr;
    *iterp = (JSDObject*) jsdobj->links.next;
    return jsdobj;
}

JSObject*
jsd_GetWrappedObject(JSDContext* jsdc, JSDObject* jsdobj)
{
    return jsdobj->obj;
}

const char*
jsd_GetObjectNewURL(JSDContext* jsdc, JSDObject* jsdobj)
{
    if( jsdobj->newURL )
        return JSD_ATOM_TO_STRING(jsdobj->newURL);
    return nullptr;
}

unsigned
jsd_GetObjectNewLineNumber(JSDContext* jsdc, JSDObject* jsdobj)
{
    return jsdobj->newLineno;
}

const char*
jsd_GetObjectConstructorURL(JSDContext* jsdc, JSDObject* jsdobj)
{
    if( jsdobj->ctorURL )
        return JSD_ATOM_TO_STRING(jsdobj->ctorURL);
    return nullptr;
}

unsigned
jsd_GetObjectConstructorLineNumber(JSDContext* jsdc, JSDObject* jsdobj)
{
    return jsdobj->ctorLineno;
}

const char*
jsd_GetObjectConstructorName(JSDContext* jsdc, JSDObject* jsdobj)
{
    if( jsdobj->ctorName )
        return JSD_ATOM_TO_STRING(jsdobj->ctorName);
    return nullptr;
}

JSDObject*
jsd_GetJSDObjectForJSObject(JSDContext* jsdc, JSObject* jsobj)
{
    JSDObject* jsdobj;

    JSD_LOCK_OBJECTS(jsdc);
    jsdobj = (JSDObject*) JS_HashTableLookup(jsdc->objectsTable, jsobj);
    JSD_UNLOCK_OBJECTS(jsdc);
    return jsdobj;
}

JSDObject*
jsd_GetObjectForValue(JSDContext* jsdc, JSDValue* jsdval)
{
    return jsd_GetJSDObjectForJSObject(jsdc, JSVAL_TO_OBJECT(jsdval->val));
}

JSDValue*
jsd_GetValueForObject(JSDContext* jsdc, JSDObject* jsdobj)
{
    return jsd_NewValue(jsdc, OBJECT_TO_JSVAL(jsdobj->obj));
}