API/APICast.h

   1 /*
   2  * Copyright (C) 2006 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 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 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 #ifndef APICast_h
  27 #define APICast_h
  28
  29 #include "JSAPIValueWrapper.h"
  30 #include "JSCJSValue.h"
  31 #include "JSCJSValueInlines.h"
  32 #include "JSGlobalObject.h"
  33
  34 namespace JSC {
  35     class ExecState;
  36     class PropertyNameArray;
  37     class VM;
  38     class JSObject;
  39     class JSValue;
  40 }
  41
  42 typedef const struct OpaqueJSContextGroup* JSContextGroupRef;
  43 typedef const struct OpaqueJSContext* JSContextRef;
  44 typedef struct OpaqueJSContext* JSGlobalContextRef;
  45 typedef struct OpaqueJSPropertyNameAccumulator* JSPropertyNameAccumulatorRef;
  46 typedef const struct OpaqueJSValue* JSValueRef;
  47 typedef struct OpaqueJSValue* JSObjectRef;
  48
  49 /* Opaque typing convenience methods */
  50
  51 inline JSC::ExecState* toJS(JSContextRef c)
  52 {
  53     ASSERT(c);
  54     return reinterpret_cast<JSC::ExecState*>(const_cast<OpaqueJSContext*>(c));
  55 }
  56
  57 inline JSC::ExecState* toJS(JSGlobalContextRef c)
  58 {
  59     ASSERT(c);
  60     return reinterpret_cast<JSC::ExecState*>(c);
  61 }
  62
  63 inline JSC::JSValue toJS(JSC::ExecState* exec, JSValueRef v)
  64 {
  65     ASSERT_UNUSED(exec, exec);
  66 #if USE(JSVALUE32_64)
  67     JSC::JSCell* jsCell = reinterpret_cast<JSC::JSCell*>(const_cast<OpaqueJSValue*>(v));
  68     if (!jsCell)
  69         return JSC::jsNull();
  70     JSC::JSValue result;
  71     if (jsCell->isAPIValueWrapper())
  72         result = JSC::jsCast<JSC::JSAPIValueWrapper*>(jsCell)->value();
  73     else
  74         result = jsCell;
  75 #else
  76     JSC::JSValue result = JSC::JSValue::decode(reinterpret_cast<JSC::EncodedJSValue>(const_cast<OpaqueJSValue*>(v)));
  77 #endif
  78     if (!result)
  79         return JSC::jsNull();
  80     if (result.isCell())
  81         RELEASE_ASSERT(result.asCell()->methodTable());
  82     return result;
  83 }
  84
  85 inline JSC::JSValue toJSForGC(JSC::ExecState* exec, JSValueRef v)
  86 {
  87     ASSERT_UNUSED(exec, exec);
  88 #if USE(JSVALUE32_64)
  89     JSC::JSCell* jsCell = reinterpret_cast<JSC::JSCell*>(const_cast<OpaqueJSValue*>(v));
  90     if (!jsCell)
  91         return JSC::JSValue();
  92     JSC::JSValue result = jsCell;
  93 #else
  94     JSC::JSValue result = JSC::JSValue::decode(reinterpret_cast<JSC::EncodedJSValue>(const_cast<OpaqueJSValue*>(v)));
  95 #endif
  96     if (result && result.isCell())
  97         RELEASE_ASSERT(result.asCell()->methodTable());
  98     return result;
  99 }
 100
 101 // Used in JSObjectGetPrivate as that may be called during finalization
 102 inline JSC::JSObject* uncheckedToJS(JSObjectRef o)
 103 {
 104     return reinterpret_cast<JSC::JSObject*>(o);
 105 }
 106
 107 inline JSC::JSObject* toJS(JSObjectRef o)
 108 {
 109     JSC::JSObject* object = uncheckedToJS(o);
 110     if (object)
 111         RELEASE_ASSERT(object->methodTable());
 112     return object;
 113 }
 114
 115 inline JSC::PropertyNameArray* toJS(JSPropertyNameAccumulatorRef a)
 116 {
 117     return reinterpret_cast<JSC::PropertyNameArray*>(a);
 118 }
 119
 120 inline JSC::VM* toJS(JSContextGroupRef g)
 121 {
 122     return reinterpret_cast<JSC::VM*>(const_cast<OpaqueJSContextGroup*>(g));
 123 }
 124
 125 inline JSValueRef toRef(JSC::ExecState* exec, JSC::JSValue v)
 126 {
 127     ASSERT(exec->vm().currentThreadIsHoldingAPILock());
 128 #if USE(JSVALUE32_64)
 129     if (!v)
 130         return 0;
 131     if (!v.isCell())
 132         return reinterpret_cast<JSValueRef>(JSC::jsAPIValueWrapper(exec, v).asCell());
 133     return reinterpret_cast<JSValueRef>(v.asCell());
 134 #else
 135     UNUSED_PARAM(exec);
 136     return reinterpret_cast<JSValueRef>(JSC::JSValue::encode(v));
 137 #endif
 138 }
 139
 140 inline JSObjectRef toRef(JSC::JSObject* o)
 141 {
 142     return reinterpret_cast<JSObjectRef>(o);
 143 }
 144
 145 inline JSObjectRef toRef(const JSC::JSObject* o)
 146 {
 147     return reinterpret_cast<JSObjectRef>(const_cast<JSC::JSObject*>(o));
 148 }
 149
 150 inline JSContextRef toRef(JSC::ExecState* e)
 151 {
 152     return reinterpret_cast<JSContextRef>(e);
 153 }
 154
 155 inline JSGlobalContextRef toGlobalRef(JSC::ExecState* e)
 156 {
 157     ASSERT(e == e->lexicalGlobalObject()->globalExec());
 158     return reinterpret_cast<JSGlobalContextRef>(e);
 159 }
 160
 161 inline JSPropertyNameAccumulatorRef toRef(JSC::PropertyNameArray* l)
 162 {
 163     return reinterpret_cast<JSPropertyNameAccumulatorRef>(l);
 164 }
 165
 166 inline JSContextGroupRef toRef(JSC::VM* g)
 167 {
 168     return reinterpret_cast<JSContextGroupRef>(g);
 169 }
 170
 171 #endif // APICast_h