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