API/JSBase.cpp

   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
  41 using namespace JSC;
  42
  43 JSValueRef 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(completion.value());
  59         return 0;
  60     }
  61
  62     if (completion.value())
  63         return toRef(completion.value());
  64
  65     // happens, for example, when the only statement is an empty (';') statement
  66     return toRef(jsUndefined());
  67 }
  68
  69 bool 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(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     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
 109 void 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 }