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 "APIShims.h"

    32 #include "Completion.h"

    33 #include "OpaqueJSString.h"

    34 #include "SourceCode.h"

    35 #include <interpreter/CallFrame.h>

    36 #include <runtime/InitializeThreading.h>

    37 #include <runtime/Completion.h>

    38 #include <runtime/JSGlobalObject.h>

    39 #include <runtime/JSLock.h>

    40 #include <runtime/JSObject.h>

    41 #include <wtf/text/StringHash.h>

    42 

    43 using namespace JSC;

    44 

    45 JSValueRef JSEvaluateScript(JSContextRef ctx, JSStringRef script, JSObjectRef thisObject, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)

    46 {

    47     ExecState* exec = toJS(ctx);

    48     APIEntryShim entryShim(exec);

    49 

    50     JSObject* jsThisObject = toJS(thisObject);

    51 

    52     // evaluate sets "this" to the global object if it is NULL

    53     JSGlobalObject* globalObject = exec->dynamicGlobalObject();

    54     SourceCode source = makeSource(script->ustring(), sourceURL->ustring(), startingLineNumber);

    55     Completion completion = evaluate(globalObject->globalExec(), globalObject->globalScopeChain(), source, jsThisObject);

    56 

    57     if (completion.complType() == Throw) {

    58         if (exception)

    59             *exception = toRef(exec, completion.value());

    60         return 0;

    61     }

    62 

    63     if (completion.value())

    64         return toRef(exec, completion.value());

    65     

    66     // happens, for example, when the only statement is an empty (';') statement

    67     return toRef(exec, jsUndefined());

    68 }

    69 

    70 bool JSCheckScriptSyntax(JSContextRef ctx, JSStringRef script, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)

    71 {

    72     ExecState* exec = toJS(ctx);

    73     APIEntryShim entryShim(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 

    86 void 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     APIEntryShim entryShim(exec, false);

    98 

    99     JSGlobalData& globalData = exec->globalData();

   100     if (!globalData.heap.isBusy())

   101         globalData.heap.collectAllGarbage();

   102 

   103     // FIXME: Perhaps we should trigger a second mark and sweep

   104     // once the garbage collector is done if this is called when

   105     // the collector is busy.

   106 }

   107 

   108 void JSReportExtraMemoryCost(JSContextRef ctx, size_t size)

   109 {

   110     ExecState* exec = toJS(ctx);

   111     APIEntryShim entryShim(exec);

   112     exec->globalData().heap.reportExtraMemoryCost(size);

   113 }