PropertyCallbackInfo< T > Class Template Reference

#include <v8-function-callback.h>

Public Member Functions
V8_INLINE Isolate *	GetIsolate () const
V8_INLINE Local< Value >	Data () const
V8_INLINE Local< Object >	This () const
V8_INLINE Local< Object >	Holder () const
V8_INLINE ReturnValue< T >	GetReturnValue () const
V8_INLINE bool	ShouldThrowOnError () const

Static Public Attributes
static const int	kArgsLength = 7

Protected Member Functions
V8_INLINE	PropertyCallbackInfo (internal::Address *args)

Protected Attributes
internal::Address *	args_

Static Protected Attributes
static const int	kShouldThrowOnErrorIndex = 0
static const int	kHolderIndex = 1
static const int	kIsolateIndex = 2
static const int	kReturnValueDefaultValueIndex = 3
static const int	kReturnValueIndex = 4
static const int	kDataIndex = 5
static const int	kThisIndex = 6

Friends
class	MacroAssembler
class	internal::PropertyCallbackArguments
class	internal::CustomArguments< PropertyCallbackInfo >

Detailed Description

template<typename T>
class v8::PropertyCallbackInfo< T >

The information passed to a property callback about the context of the property access.

Definition at line 145 of file v8-function-callback.h.

Constructor & Destructor Documentation

PropertyCallbackInfo()

template<typename T >

V8_INLINE PropertyCallbackInfo ( internal::Address *  args )

inlineprotected

Definition at line 247 of file v8-function-callback.h.

Member Function Documentation

Data()

template<typename T >

Local< Value > Data

Returns

The data set in the configuration, i.e., in NamedPropertyHandlerConfiguration or IndexedPropertyHandlerConfiguration.

Definition at line 443 of file v8-function-callback.h.

GetIsolate()

template<typename T >

Isolate * GetIsolate

Returns

The isolate of the property access.

Definition at line 438 of file v8-function-callback.h.

GetReturnValue()

template<typename T >

ReturnValue< T > GetReturnValue

Returns

The return value of the callback. Can be changed by calling Set().

info.GetReturnValue().Set(...)

Definition at line 458 of file v8-function-callback.h.

Holder()

template<typename T >

Local< Object > Holder

Returns

The object in the prototype chain of the receiver that has the interceptor. Suppose you have x and its prototype is y, and y has an interceptor. Then info.This() is x and info.Holder() is y. The Holder() could be a hidden object (the global object, rather than the global proxy).

Note

For security reasons, do not pass the object back into the runtime.

Definition at line 453 of file v8-function-callback.h.

ShouldThrowOnError()

template<typename T >

bool ShouldThrowOnError

Returns

True if the intercepted function should throw if an error occurs. Usually, true corresponds to ‘'use strict’`.

Note

Always false when intercepting Reflect.set() independent of the language mode.

Definition at line 463 of file v8-function-callback.h.

References v8::internal::ShouldThrowOnError().

This()

template<typename T >

Local< Object > This

Returns

The receiver. In many cases, this is the object on which the property access was intercepted. When using Reflect.get, Function.prototype.call, or similar functions, it is the object passed in as receiver or thisArg.

void GetterCallback(Local<Name> name,
                    const v8::PropertyCallbackInfo<v8::Value>& info) {
   auto context = info.GetIsolate()->GetCurrentContext();
 
   v8::Local<v8::Value> a_this =
       info.This()
           ->GetRealNamedProperty(context, v8_str("a"))
           .ToLocalChecked();
   v8::Local<v8::Value> a_holder =
       info.Holder()
           ->GetRealNamedProperty(context, v8_str("a"))
           .ToLocalChecked();
 
  CHECK(v8_str("r")->Equals(context, a_this).FromJust());
  CHECK(v8_str("obj")->Equals(context, a_holder).FromJust());
 
  info.GetReturnValue().Set(name);
}
 
v8::Local<v8::FunctionTemplate> templ =
v8::FunctionTemplate::New(isolate);
templ->InstanceTemplate()->SetHandler(
    v8::NamedPropertyHandlerConfiguration(GetterCallback));
LocalContext env;
env->Global()
    ->Set(env.local(), v8_str("obj"), templ->GetFunction(env.local())
                                         .ToLocalChecked()
                                         ->NewInstance(env.local())
                                         .ToLocalChecked())
    .FromJust();
 
CompileRun("obj.a = 'obj'; var r = {a: 'r'}; Reflect.get(obj, 'x', r)");

Definition at line 448 of file v8-function-callback.h.

Friends And Related Symbol Documentation

internal::CustomArguments< PropertyCallbackInfo >

template<typename T >

friend class internal::CustomArguments< PropertyCallbackInfo >

friend

Definition at line 237 of file v8-function-callback.h.

internal::PropertyCallbackArguments

template<typename T >

friend class internal::PropertyCallbackArguments

friend

Definition at line 237 of file v8-function-callback.h.

MacroAssembler

template<typename T >

friend class MacroAssembler

friend

Definition at line 236 of file v8-function-callback.h.

Field Documentation

args_

template<typename T >

internal::Address* args_

protected

Definition at line 248 of file v8-function-callback.h.

kArgsLength

template<typename T >

const int kArgsLength = 7

static

Definition at line 233 of file v8-function-callback.h.

kDataIndex

template<typename T >

const int kDataIndex = 5

staticprotected

Definition at line 244 of file v8-function-callback.h.

kHolderIndex

template<typename T >

const int kHolderIndex = 1

staticprotected

Definition at line 240 of file v8-function-callback.h.

kIsolateIndex

template<typename T >

const int kIsolateIndex = 2

staticprotected

Definition at line 241 of file v8-function-callback.h.

kReturnValueDefaultValueIndex

template<typename T >

const int kReturnValueDefaultValueIndex = 3

staticprotected

Definition at line 242 of file v8-function-callback.h.

kReturnValueIndex

template<typename T >

const int kReturnValueIndex = 4

staticprotected

Definition at line 243 of file v8-function-callback.h.

kShouldThrowOnErrorIndex

template<typename T >

const int kShouldThrowOnErrorIndex = 0

staticprotected

Definition at line 239 of file v8-function-callback.h.

kThisIndex

template<typename T >

const int kThisIndex = 6

staticprotected

Definition at line 245 of file v8-function-callback.h.

---

The documentation for this class was generated from the following file:

• include/v8-function-callback.h