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      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 }
    114