JSBase.cpp revision 5f1ab04193ad0130ca8204aadaceae083aca9881 
1/*
2 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "JSBase.h"
28#include "JSBasePrivate.h"
29
30#include "APICast.h"
31#include "Completion.h"
32#include "OpaqueJSString.h"
33#include "SourceCode.h"
34#include <interpreter/CallFrame.h>
35#include <runtime/InitializeThreading.h>
36#include <runtime/Completion.h>
37#include <runtime/JSGlobalObject.h>
38#include <runtime/JSLock.h>
39#include <runtime/JSObject.h>
40
41using namespace JSC;
42
43JSValueRef JSEvaluateScript(JSContextRef ctx, JSStringRef script, JSObjectRef thisObject, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)
44{
45    ExecState* exec = toJS(ctx);
46    exec->globalData().heap.registerThread();
47    JSLock lock(exec);
48
49    JSObject* jsThisObject = toJS(thisObject);
50
51    // evaluate sets "this" to the global object if it is NULL
52    JSGlobalObject* globalObject = exec->dynamicGlobalObject();
53    SourceCode source = makeSource(script->ustring(), sourceURL->ustring(), startingLineNumber);
54    Completion completion = evaluate(globalObject->globalExec(), globalObject->globalScopeChain(), source, jsThisObject);
55
56    if (completion.complType() == Throw) {
57        if (exception)
58            *exception = toRef(exec, completion.value());
59        return 0;
60    }
61
62    if (completion.value())
63        return toRef(exec, completion.value());
64
65    // happens, for example, when the only statement is an empty (';') statement
66    return toRef(exec, jsUndefined());
67}
68
69bool JSCheckScriptSyntax(JSContextRef ctx, JSStringRef script, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)
70{
71    ExecState* exec = toJS(ctx);
72    exec->globalData().heap.registerThread();
73    JSLock lock(exec);
74
75    SourceCode source = makeSource(script->ustring(), sourceURL->ustring(), startingLineNumber);
76    Completion completion = checkSyntax(exec->dynamicGlobalObject()->globalExec(), source);
77    if (completion.complType() == Throw) {
78        if (exception)
79            *exception = toRef(exec, completion.value());
80        return false;
81    }
82
83    return true;
84}
85
86void JSGarbageCollect(JSContextRef ctx)
87{
88    // We used to recommend passing NULL as an argument here, which caused the only heap to be collected.
89    // As there is no longer a shared heap, the previously recommended usage became a no-op (but the GC
90    // will happen when the context group is destroyed).
91    // Because the function argument was originally ignored, some clients may pass their released context here,
92    // in which case there is a risk of crashing if another thread performs GC on the same heap in between.
93    if (!ctx)
94        return;
95
96    ExecState* exec = toJS(ctx);
97    JSGlobalData& globalData = exec->globalData();
98
99    JSLock lock(globalData.isSharedInstance);
100
101    if (!globalData.heap.isBusy())
102        globalData.heap.collect();
103
104    // FIXME: Perhaps we should trigger a second mark and sweep
105    // once the garbage collector is done if this is called when
106    // the collector is busy.
107}
108
109void JSReportExtraMemoryCost(JSContextRef ctx, size_t size)
110{
111    ExecState* exec = toJS(ctx);
112    exec->globalData().heap.registerThread();
113    JSLock lock(exec);
114
115    exec->globalData().heap.reportExtraMemoryCost(size);
116}
117