swig/Lib/javascript/v8/javascriptruntime.swg

/* -----------------------------------------------------------------------------
 * javascriptruntime.swg
 *
 * Javascript support code
 * ----------------------------------------------------------------------------- */

%insert(runtime) %{
#include <v8.h>
#include <errno.h>
#include <limits.h>
%}

%insert(runtime) "swigrun.swg";         /* SWIG API */
%insert(runtime) "swigerrors.swg";      /* SWIG errors */   

%insert(runtime) %{
#define SWIG_Error(code, msg)     SWIGV8_ErrorHandler.error(code, msg)
#define SWIG_exception(code, msg) SWIGV8_ErrorHandler.error(code, msg)
#define SWIG_fail                 goto fail
#define SWIGV8_OVERLOAD false

void SWIG_V8_Raise(const char* msg) {
  v8::ThrowException(v8::Exception::Error(v8::String::New(msg)));
}

/* 
  Note: There are two contexts for handling errors.
  A static V8ErrorHandler is used in not overloaded methods.
  For overloaded methods the throwing type checking mechanism is used
  during dispatching. As V8 exceptions can not be resetted properly
  the trick is to use a dynamic ErrorHandler with same local name as the global
  one.
  
  - See defintion of SWIG_Error above.
  - See code templates 'JS_function_dispatcher', 'JS_functionwrapper_overload', 
    and 'JS_function_dispatch_case' in javascriptcode.swg

*/
class V8ErrorHandler {
public:
  virtual void error(int code, const char* msg) {
    SWIG_V8_Raise(msg);
  }
};
// this is used in usually
V8ErrorHandler SWIGV8_ErrorHandler;

// instances of this are used in overloaded functions
class OverloadErrorHandler: public V8ErrorHandler {
public:
  virtual void error(int code, const char* msg) {
    err = v8::Exception::Error(v8::String::New(msg));
    if(code != SWIG_TypeError) {
      v8::ThrowException(err);
    }
  }
  v8::Handle<v8::Value> err;
};
%}

%insert(runtime) %{

// Note: to trigger the c8 gc more often one can tell v8 about the memory consumption
// TODO: we could add a v8 specific parameter to control this value
#define SWIGV8_AVG_OBJ_SIZE 1000

class SWIGV8_Proxy {
public:
  SWIGV8_Proxy(): swigCMemOwn(false), swigCObject(0), info(0) {
    v8::V8::AdjustAmountOfExternalAllocatedMemory(SWIGV8_AVG_OBJ_SIZE);
  };
  
  ~SWIGV8_Proxy() { 
    handle.ClearWeak();
    //handle->SetInternalField(0, v8::Undefined());
    handle.Dispose();
    handle.Clear();
    v8::V8::AdjustAmountOfExternalAllocatedMemory(-SWIGV8_AVG_OBJ_SIZE);
  }
  
  bool swigCMemOwn;
  void *swigCObject;
  swig_type_info *info;
  v8::Persistent<v8::Object> handle;
};

class SWIGV8_ClientData {
public:
  v8::Persistent<v8::FunctionTemplate> class_templ;
  void (*dtor) (v8::Isolate *iso, v8::Persistent< v8::Object > *object, SWIGV8_Proxy *parameter);
};

v8::Persistent<v8::FunctionTemplate> SWIGV8_SWIGTYPE_Proxy_class_templ;

int SWIG_V8_ConvertInstancePtr(v8::Handle<v8::Object> objRef, void** ptr, swig_type_info *info, int flags) {
  v8::HandleScope scope;
  
  if(objRef->InternalFieldCount() < 1) return SWIG_ERROR;
  SWIGV8_Proxy *cdata = static_cast<SWIGV8_Proxy *>(objRef->GetAlignedPointerFromInternalField(0));
  if(cdata == NULL) {
    return SWIG_ERROR;
  }
  if(cdata->info != info) {
    bool type_valid = false;
    swig_cast_info *t = info->cast; 
    while(t != NULL) {
      if(t->type == cdata->info) {
        type_valid = true;
        break;
      }
      t = t->next;
    }
    if(!type_valid) {
      return SWIG_TypeError;
    }
  }
  *ptr = cdata->swigCObject;
  if(flags & SWIG_POINTER_DISOWN) {
    cdata->swigCMemOwn = false;
  }
  return SWIG_OK;
}

void SWIGV8_Proxy_DefaultDtor(v8::Isolate* isolate, v8::Persistent< v8::Object > *object, SWIGV8_Proxy *proxy) {
  delete proxy;
}

void SWIGV8_SetPrivateData(v8::Handle<v8::Object> obj, void* ptr, swig_type_info *info, int flags) {
  SWIGV8_Proxy* cdata = new SWIGV8_Proxy();
  cdata->swigCObject = ptr;  
  cdata->swigCMemOwn = (flags & SWIG_POINTER_OWN) ? 1 : 0;
  cdata->info = info;
  obj->SetAlignedPointerInInternalField(0, cdata);

  cdata->handle.Reset(v8::Isolate::GetCurrent(), obj);

  // clientdata must be set for owned data as we need to register the dtor
  if(cdata->swigCMemOwn) {
    cdata->handle.MakeWeak(cdata, ((SWIGV8_ClientData*)info->clientdata)->dtor);
  } else {
    cdata->handle.MakeWeak(cdata, SWIGV8_Proxy_DefaultDtor);
  }
  cdata->handle.MarkIndependent();
}

int SWIG_V8_ConvertPtr(v8::Handle<v8::Value> valRef, void** ptr, swig_type_info *info, int flags) {
  v8::HandleScope scope;

  if(!valRef->IsObject()) {
    return SWIG_TypeError;
  }
  v8::Handle<v8::Object> objRef = valRef->ToObject();
  return SWIG_V8_ConvertInstancePtr(objRef, ptr, info, flags);
}

v8::Handle<v8::Object> SWIG_V8_NewPointerObj(void *ptr, swig_type_info *info, int flags) {
  v8::HandleScope scope;
  v8::Isolate *iso = v8::Isolate::GetCurrent();
  
  v8::Handle<v8::FunctionTemplate> class_templ;
  if(info->clientdata != 0) {
    class_templ = v8::Handle<v8::FunctionTemplate>::New(iso, ((SWIGV8_ClientData*) info->clientdata)->class_templ);
  } else {
    class_templ = v8::Handle<v8::FunctionTemplate>::New(iso, SWIGV8_SWIGTYPE_Proxy_class_templ);
  }
  v8::Handle<v8::Object> result = class_templ->InstanceTemplate()->NewInstance();
  SWIGV8_SetPrivateData(result, ptr, info, flags);
  
  return scope.Close(result);
}

#define SWIG_ConvertPtr(obj, ptr, info, flags)    SWIG_V8_ConvertPtr(obj, ptr, info, flags)
#define SWIG_NewPointerObj(ptr, info, flags)      SWIG_V8_NewPointerObj(ptr, info, flags)

#define SWIG_ConvertInstance(obj, pptr, type, flags)    SWIG_V8_ConvertInstancePtr(obj, pptr, type, flags)
#define SWIG_NewInstanceObj(thisvalue, type, flags)     SWIG_V8_NewPointerObj(thisvalue, type, flags)

%}