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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/UnusedParam.h>
     33 
     34 namespace JSC {
     35     class ExecState;
     36     class PropertyNameArray;
     37     class JSGlobalData;
     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     ASSERT(v);
     67 #if USE(JSVALUE32_64)
     68     JSC::JSCell* jsCell = reinterpret_cast<JSC::JSCell*>(const_cast<OpaqueJSValue*>(v));
     69     if (!jsCell)
     70         return JSC::JSValue();
     71     if (jsCell->isAPIValueWrapper())
     72         return static_cast<JSC::JSAPIValueWrapper*>(jsCell)->value();
     73     return jsCell;
     74 #else
     75     return JSC::JSValue::decode(reinterpret_cast<JSC::EncodedJSValue>(const_cast<OpaqueJSValue*>(v)));
     76 #endif
     77 }
     78 
     79 inline JSC::JSValue toJSForGC(JSC::ExecState* exec, JSValueRef v)
     80 {
     81     ASSERT_UNUSED(exec, exec);
     82     ASSERT(v);
     83 #if USE(JSVALUE32_64)
     84     JSC::JSCell* jsCell = reinterpret_cast<JSC::JSCell*>(const_cast<OpaqueJSValue*>(v));
     85     if (!jsCell)
     86         return JSC::JSValue();
     87     return jsCell;
     88 #else
     89     return JSC::JSValue::decode(reinterpret_cast<JSC::EncodedJSValue>(const_cast<OpaqueJSValue*>(v)));
     90 #endif
     91 }
     92 
     93 inline JSC::JSObject* toJS(JSObjectRef o)
     94 {
     95     return reinterpret_cast<JSC::JSObject*>(o);
     96 }
     97 
     98 inline JSC::PropertyNameArray* toJS(JSPropertyNameAccumulatorRef a)
     99 {
    100     return reinterpret_cast<JSC::PropertyNameArray*>(a);
    101 }
    102 
    103 inline JSC::JSGlobalData* toJS(JSContextGroupRef g)
    104 {
    105     return reinterpret_cast<JSC::JSGlobalData*>(const_cast<OpaqueJSContextGroup*>(g));
    106 }
    107 
    108 inline JSValueRef toRef(JSC::ExecState* exec, JSC::JSValue v)
    109 {
    110 #if USE(JSVALUE32_64)
    111     if (!v)
    112         return 0;
    113     if (!v.isCell())
    114         return reinterpret_cast<JSValueRef>(JSC::jsAPIValueWrapper(exec, v).asCell());
    115     return reinterpret_cast<JSValueRef>(v.asCell());
    116 #else
    117     UNUSED_PARAM(exec);
    118     return reinterpret_cast<JSValueRef>(JSC::JSValue::encode(v));
    119 #endif
    120 }
    121 
    122 inline JSObjectRef toRef(JSC::JSObject* o)
    123 {
    124     return reinterpret_cast<JSObjectRef>(o);
    125 }
    126 
    127 inline JSObjectRef toRef(const JSC::JSObject* o)
    128 {
    129     return reinterpret_cast<JSObjectRef>(const_cast<JSC::JSObject*>(o));
    130 }
    131 
    132 inline JSContextRef toRef(JSC::ExecState* e)
    133 {
    134     return reinterpret_cast<JSContextRef>(e);
    135 }
    136 
    137 inline JSGlobalContextRef toGlobalRef(JSC::ExecState* e)
    138 {
    139     ASSERT(e == e->lexicalGlobalObject()->globalExec());
    140     return reinterpret_cast<JSGlobalContextRef>(e);
    141 }
    142 
    143 inline JSPropertyNameAccumulatorRef toRef(JSC::PropertyNameArray* l)
    144 {
    145     return reinterpret_cast<JSPropertyNameAccumulatorRef>(l);
    146 }
    147 
    148 inline JSContextGroupRef toRef(JSC::JSGlobalData* g)
    149 {
    150     return reinterpret_cast<JSContextGroupRef>(g);
    151 }
    152 
    153 #endif // APICast_h
    154