src/third_party/WebKit/Source/bindings/core/v8/V8NPUtils.cpp

   1 /*
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  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
  13  * distribution.
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  30
  31 #include "config.h"
  32 #include "bindings/core/v8/V8NPUtils.h"
  33
  34 #include "bindings/core/v8/NPV8Object.h"
  35 #include "bindings/core/v8/V8Binding.h"
  36 #include "bindings/core/v8/V8NPObject.h"
  37 #include "bindings/core/v8/npruntime_impl.h"
  38 #include "bindings/core/v8/npruntime_priv.h"
  39 #include "core/frame/LocalDOMWindow.h"
  40 #include "wtf/text/WTFString.h"
  41
  42 #include <stdlib.h>
  43
  44 namespace blink {
  45
  46 void convertV8ObjectToNPVariant(v8::Isolate* isolate, v8::Local<v8::Value> object, NPObject* owner, NPVariant* result)
  47 {
  48     VOID_TO_NPVARIANT(*result);
  49
  50     // It is really the caller's responsibility to deal with the empty handle case because there could be different actions to
  51     // take in different contexts.
  52     ASSERT(!object.IsEmpty());
  53
  54     if (object.IsEmpty())
  55         return;
  56
  57     if (object->IsNumber()) {
  58         DOUBLE_TO_NPVARIANT(object->NumberValue(), *result);
  59     } else if (object->IsBoolean()) {
  60         BOOLEAN_TO_NPVARIANT(object->BooleanValue(), *result);
  61     } else if (object->IsNull()) {
  62         NULL_TO_NPVARIANT(*result);
  63     } else if (object->IsUndefined()) {
  64         VOID_TO_NPVARIANT(*result);
  65     } else if (object->IsString()) {
  66         v8::Handle<v8::String> str = object.As<v8::String>();
  67         int length = str->Utf8Length() + 1;
  68         char* utf8Chars = reinterpret_cast<char*>(malloc(length));
  69         str->WriteUtf8(utf8Chars, length, 0, v8::String::HINT_MANY_WRITES_EXPECTED);
  70         STRINGN_TO_NPVARIANT(utf8Chars, length-1, *result);
  71     } else if (object->IsObject()) {
  72         LocalDOMWindow* window = currentDOMWindow(isolate);
  73         NPObject* npobject = npCreateV8ScriptObject(isolate, 0, v8::Handle<v8::Object>::Cast(object), window);
  74         if (npobject)
  75             _NPN_RegisterObject(npobject, owner);
  76         OBJECT_TO_NPVARIANT(npobject, *result);
  77     }
  78 }
  79
  80 v8::Handle<v8::Value> convertNPVariantToV8Object(v8::Isolate* isolate, const NPVariant* variant, NPObject* owner)
  81 {
  82     NPVariantType type = variant->type;
  83
  84     switch (type) {
  85     case NPVariantType_Int32:
  86         return v8::Integer::New(isolate, NPVARIANT_TO_INT32(*variant));
  87     case NPVariantType_Double:
  88         return v8::Number::New(isolate, NPVARIANT_TO_DOUBLE(*variant));
  89     case NPVariantType_Bool:
  90         return v8Boolean(NPVARIANT_TO_BOOLEAN(*variant), isolate);
  91     case NPVariantType_Null:
  92         return v8::Null(isolate);
  93     case NPVariantType_Void:
  94         return v8::Undefined(isolate);
  95     case NPVariantType_String: {
  96         NPString src = NPVARIANT_TO_STRING(*variant);
  97         return v8::String::NewFromUtf8(isolate, src.UTF8Characters, v8::String::kNormalString, src.UTF8Length);
  98     }
  99     case NPVariantType_Object: {
 100         NPObject* object = NPVARIANT_TO_OBJECT(*variant);
 101         if (V8NPObject* v8Object = npObjectToV8NPObject(object))
 102             return v8::Local<v8::Object>::New(isolate, v8Object->v8Object);
 103         return createV8ObjectForNPObject(isolate, object, owner);
 104     }
 105     default:
 106         return v8::Undefined(isolate);
 107     }
 108 }
 109
 110 // Helper function to create an NPN String Identifier from a v8 string.
 111 NPIdentifier getStringIdentifier(v8::Handle<v8::String> str)
 112 {
 113     const int kStackBufferSize = 100;
 114
 115     int bufferLength = str->Utf8Length() + 1;
 116     if (bufferLength <= kStackBufferSize) {
 117         // Use local stack buffer to avoid heap allocations for small strings. Here we should only use the stack space for
 118         // stackBuffer when it's used, not when we use the heap.
 119         //
 120         // WriteUtf8 is guaranteed to generate a null-terminated string because bufferLength is constructed to be one greater
 121         // than the string length.
 122         char stackBuffer[kStackBufferSize];
 123         str->WriteUtf8(stackBuffer, bufferLength);
 124         return _NPN_GetStringIdentifier(stackBuffer);
 125     }
 126
 127     v8::String::Utf8Value utf8(str);
 128     return _NPN_GetStringIdentifier(*utf8);
 129 }
 130
 131 struct ExceptionHandlerInfo {
 132     ExceptionHandlerInfo* previous;
 133     ExceptionHandler handler;
 134     void* data;
 135 };
 136
 137 static ExceptionHandlerInfo* topHandler;
 138
 139 void pushExceptionHandler(ExceptionHandler handler, void* data)
 140 {
 141     ExceptionHandlerInfo* info = new ExceptionHandlerInfo;
 142     info->previous = topHandler;
 143     info->handler = handler;
 144     info->data = data;
 145     topHandler = info;
 146 }
 147
 148 void popExceptionHandler()
 149 {
 150     ASSERT(topHandler);
 151     ExceptionHandlerInfo* doomed = topHandler;
 152     topHandler = topHandler->previous;
 153     delete doomed;
 154 }
 155
 156 ExceptionCatcher::ExceptionCatcher()
 157 {
 158     if (!topHandler)
 159         m_tryCatch.SetVerbose(true);
 160 }
 161
 162 ExceptionCatcher::~ExceptionCatcher()
 163 {
 164     if (!m_tryCatch.HasCaught())
 165         return;
 166
 167     if (topHandler)
 168         topHandler->handler(topHandler->data, *v8::String::Utf8Value(m_tryCatch.Exception()));
 169 }
 170
 171 } // namespace blink