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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 
     42 using namespace JSC;
     43 
     44 JSValueRef JSEvaluateScript(JSContextRef ctx, JSStringRef script, JSObjectRef thisObject, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)
     45 {
     46     ExecState* exec = toJS(ctx);
     47     APIEntryShim entryShim(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 
     69 bool JSCheckScriptSyntax(JSContextRef ctx, JSStringRef script, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)
     70 {
     71     ExecState* exec = toJS(ctx);
     72     APIEntryShim entryShim(exec);
     73 
     74     SourceCode source = makeSource(script->ustring(), sourceURL->ustring(), startingLineNumber);
     75     Completion completion = checkSyntax(exec->dynamicGlobalObject()->globalExec(), source);
     76     if (completion.complType() == Throw) {
     77         if (exception)
     78             *exception = toRef(exec, completion.value());
     79         return false;
     80     }
     81 
     82     return true;
     83 }
     84 
     85 void JSGarbageCollect(JSContextRef ctx)
     86 {
     87     // We used to recommend passing NULL as an argument here, which caused the only heap to be collected.
     88     // As there is no longer a shared heap, the previously recommended usage became a no-op (but the GC
     89     // will happen when the context group is destroyed).
     90     // Because the function argument was originally ignored, some clients may pass their released context here,
     91     // in which case there is a risk of crashing if another thread performs GC on the same heap in between.
     92     if (!ctx)
     93         return;
     94 
     95     ExecState* exec = toJS(ctx);
     96     APIEntryShim entryShim(exec, false);
     97 
     98     JSGlobalData& globalData = exec->globalData();
     99     if (!globalData.heap.isBusy())
    100         globalData.heap.collectAllGarbage();
    101 
    102     // FIXME: Perhaps we should trigger a second mark and sweep
    103     // once the garbage collector is done if this is called when
    104     // the collector is busy.
    105 }
    106 
    107 void JSReportExtraMemoryCost(JSContextRef ctx, size_t size)
    108 {
    109     ExecState* exec = toJS(ctx);
    110     APIEntryShim entryShim(exec);
    111     exec->globalData().heap.reportExtraMemoryCost(size);
    112 }
    113