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 "APIShims.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 #include <wtf/text/StringHash.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(), TextPosition(OrdinalNumber::fromOneBasedInt(startingLineNumber), OrdinalNumber::first()));
  54
  55     JSValue evaluationException;
  56     JSValue returnValue = evaluate(globalObject->globalExec(), globalObject->globalScopeChain(), source, jsThisObject, &evaluationException);
  57
  58     if (evaluationException) {
  59         if (exception)
  60             *exception = toRef(exec, evaluationException);
  61         return 0;
  62     }
  63
  64     if (returnValue)
  65         return toRef(exec, returnValue);
  66
  67     // happens, for example, when the only statement is an empty (';') statement
  68     return toRef(exec, jsUndefined());
  69 }
  70
  71 bool JSCheckScriptSyntax(JSContextRef ctx, JSStringRef script, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)
  72 {
  73     ExecState* exec = toJS(ctx);
  74     APIEntryShim entryShim(exec);
  75
  76     SourceCode source = makeSource(script->ustring(), sourceURL->ustring(), TextPosition(OrdinalNumber::fromOneBasedInt(startingLineNumber), OrdinalNumber::first()));
  77
  78     JSValue syntaxException;
  79     bool isValidSyntax = checkSyntax(exec->dynamicGlobalObject()->globalExec(), source, &syntaxException);
  80
  81     if (!isValidSyntax) {
  82         if (exception)
  83             *exception = toRef(exec, syntaxException);
  84         return false;
  85     }
  86
  87     return true;
  88 }
  89
  90 void JSGarbageCollect(JSContextRef ctx)
  91 {
  92     // We used to recommend passing NULL as an argument here, which caused the only heap to be collected.
  93     // As there is no longer a shared heap, the previously recommended usage became a no-op (but the GC
  94     // will happen when the context group is destroyed).
  95     // Because the function argument was originally ignored, some clients may pass their released context here,
  96     // in which case there is a risk of crashing if another thread performs GC on the same heap in between.
  97     if (!ctx)
  98         return;
  99
 100     ExecState* exec = toJS(ctx);
 101     APIEntryShim entryShim(exec, false);
 102
 103     exec->globalData().heap.reportAbandonedObjectGraph();
 104 }
 105
 106 void JSReportExtraMemoryCost(JSContextRef ctx, size_t size)
 107 {
 108     ExecState* exec = toJS(ctx);
 109     APIEntryShim entryShim(exec);
 110     exec->globalData().heap.reportExtraMemoryCost(size);
 111 }
 112
 113 void JSDisableGCTimer(void)
 114 {
 115     GCActivityCallback::s_shouldCreateGCTimer = false;
 116 }