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 "CallFrame.h"
  33 #include "Completion.h"
  34 #include "InitializeThreading.h"
  35 #include "JSGlobalObject.h"
  36 #include "JSLock.h"
  37 #include "JSObject.h"
  38 #include "OpaqueJSString.h"
  39 #include "Operations.h"
  40 #include "SourceCode.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     if (!ctx) {
  48         ASSERT_NOT_REACHED();
  49         return 0;
  50     }
  51     ExecState* exec = toJS(ctx);
  52     APIEntryShim entryShim(exec);
  53
  54     JSObject* jsThisObject = toJS(thisObject);
  55
  56     // evaluate sets "this" to the global object if it is NULL
  57     JSGlobalObject* globalObject = exec->dynamicGlobalObject();
  58     SourceCode source = makeSource(script->string(), sourceURL->string(), TextPosition(OrdinalNumber::fromOneBasedInt(startingLineNumber), OrdinalNumber::first()));
  59
  60     JSValue evaluationException;
  61     JSValue returnValue = evaluate(globalObject->globalExec(), source, jsThisObject, &evaluationException);
  62
  63     if (evaluationException) {
  64         if (exception)
  65             *exception = toRef(exec, evaluationException);
  66         return 0;
  67     }
  68
  69     if (returnValue)
  70         return toRef(exec, returnValue);
  71
  72     // happens, for example, when the only statement is an empty (';') statement
  73     return toRef(exec, jsUndefined());
  74 }
  75
  76 bool JSCheckScriptSyntax(JSContextRef ctx, JSStringRef script, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)
  77 {
  78     if (!ctx) {
  79         ASSERT_NOT_REACHED();
  80         return false;
  81     }
  82     ExecState* exec = toJS(ctx);
  83     APIEntryShim entryShim(exec);
  84
  85     SourceCode source = makeSource(script->string(), sourceURL->string(), TextPosition(OrdinalNumber::fromOneBasedInt(startingLineNumber), OrdinalNumber::first()));
  86
  87     JSValue syntaxException;
  88     bool isValidSyntax = checkSyntax(exec->dynamicGlobalObject()->globalExec(), source, &syntaxException);
  89
  90     if (!isValidSyntax) {
  91         if (exception)
  92             *exception = toRef(exec, syntaxException);
  93         return false;
  94     }
  95
  96     return true;
  97 }
  98
  99 void JSGarbageCollect(JSContextRef ctx)
 100 {
 101     // We used to recommend passing NULL as an argument here, which caused the only heap to be collected.
 102     // As there is no longer a shared heap, the previously recommended usage became a no-op (but the GC
 103     // will happen when the context group is destroyed).
 104     // Because the function argument was originally ignored, some clients may pass their released context here,
 105     // in which case there is a risk of crashing if another thread performs GC on the same heap in between.
 106     if (!ctx)
 107         return;
 108
 109     ExecState* exec = toJS(ctx);
 110     APIEntryShim entryShim(exec, false);
 111
 112     exec->vm().heap.reportAbandonedObjectGraph();
 113 }
 114
 115 void JSReportExtraMemoryCost(JSContextRef ctx, size_t size)
 116 {
 117     if (!ctx) {
 118         ASSERT_NOT_REACHED();
 119         return;
 120     }
 121     ExecState* exec = toJS(ctx);
 122     APIEntryShim entryShim(exec);
 123     exec->vm().heap.reportExtraMemoryCost(size);
 124 }
 125
 126 extern "C" JS_EXPORT void JSSynchronousGarbageCollectForDebugging(JSContextRef);
 127
 128 void JSSynchronousGarbageCollectForDebugging(JSContextRef ctx)
 129 {
 130     if (!ctx)
 131         return;
 132
 133     ExecState* exec = toJS(ctx);
 134     APIEntryShim entryShim(exec);
 135     exec->vm().heap.collectAllGarbage();
 136 }
 137
 138 #if PLATFORM(IOS)
 139 void JSDisableGCTimer(void)
 140 {
 141     GCActivityCallback::s_shouldCreateGCTimer = false;
 142 }
 143
 144 JS_EXPORT extern const char install_name_4_3 __asm("$ld$install_name$os4.3$/System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore");
 145 JS_EXPORT extern const char install_name_5_0 __asm("$ld$install_name$os5.0$/System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore");
 146 JS_EXPORT extern const char install_name_5_1 __asm("$ld$install_name$os5.1$/System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore");
 147 JS_EXPORT extern const char install_name_6_0 __asm("$ld$install_name$os6.0$/System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore");
 148 JS_EXPORT extern const char install_name_6_1 __asm("$ld$install_name$os6.1$/System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore");
 149
 150 const char install_name_4_3 = 0;
 151 const char install_name_5_0 = 0;
 152 const char install_name_5_1 = 0;
 153 const char install_name_6_0 = 0;
 154 const char install_name_6_1 = 0;
 155 #endif // PLATFORM(IOS)