v8  3.14.5(node0.10.48)
V8 is Google's open source JavaScript engine
TryCatch Class Reference

#include <v8.h>

Public Member Functions

 TryCatch ()
 ~TryCatch ()
bool HasCaught () const
bool CanContinue () const
Handle< ValueReThrow ()
Local< ValueException () const
Local< ValueStackTrace () const
Local< v8::MessageMessage () const
void Reset ()
void SetVerbose (bool value)
void SetCaptureMessage (bool value)


class v8::internal::Isolate

Detailed Description

An external exception handler.

Definition at line 3508 of file v8.h.

Constructor & Destructor Documentation

TryCatch ( )

Creates a new try/catch block and registers it with v8.

~TryCatch ( )

Unregisters and deletes this try/catch block.

Member Function Documentation

bool CanContinue ( ) const

For certain types of exceptions, it makes no sense to continue execution.

Currently, the only type of exception that can be caught by a TryCatch handler and for which it does not make sense to continue is termination exception. Such exceptions are thrown when the TerminateExecution methods are called to terminate a long-running script.

If CanContinue returns false, the correct action is to perform any C++ cleanup needed and then return.

Local<Value> Exception ( ) const

Returns the exception caught by this try/catch block. If no exception has been caught an empty handle is returned.

The returned handle is valid until this TryCatch block has been destroyed.

bool HasCaught ( ) const

Returns true if an exception has been caught by this try/catch block.

Returns the message associated with this exception. If there is no message associated an empty handle is returned.

The returned handle is valid until this TryCatch block has been destroyed.

void Reset ( )

Clears any exceptions that may have been caught by this try/catch block. After this method has been called, HasCaught() will return false.

It is not necessary to clear a try/catch block before using it again; if another exception is thrown the previously caught exception will just be overwritten. However, it is often a good idea since it makes it easier to determine which operation threw a given exception.

Handle<Value> ReThrow ( )

Throws the exception caught by this TryCatch in a way that avoids it being caught again by this same TryCatch. As with ThrowException it is illegal to execute any JavaScript operations after calling ReThrow; the caller must return immediately to where the exception is caught.

void SetCaptureMessage ( bool  value)

Set whether or not this TryCatch should capture a Message object which holds source information about where the exception occurred. True by default.

void SetVerbose ( bool  value)

Set verbosity of the external exception handler.

By default, exceptions that are caught by an external exception handler are not reported. Call SetVerbose with true on an external exception handler to have exceptions caught by the handler reported as if they were not caught.

Local<Value> StackTrace ( ) const

Returns the .stack property of the thrown object. If no .stack property is present an empty handle is returned.

Friends And Related Function Documentation

friend class v8::internal::Isolate

Definition at line 3610 of file v8.h.

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