Hands-On WebAssembly for C++ Programmers - Catching WebAssembly Traps

The video tutorial explains WebAssembly traps, which occur during exceptional events like divide by zero. It discusses how LLVM handles traps through clamping and provides examples using JavaScript try-catch blocks. The tutorial highlights differences between WebAssembly and JavaScript in handling divide by zero, where WebAssembly throws a runtime error, while JavaScript returns Infinity. It also covers exception handling, noting that exceptions do not bubble up to JavaScript by default but can be enabled with specific compile options. The video concludes with a look at future improvements in WebAssembly's native exception support.

What is a WebAssembly trap?

• An error that occurs during exceptional events

• A feature to enhance security

• A mechanism to optimize code execution

• A tool for debugging JavaScript

How does LLVM handle traps in WebAssembly?

• By ignoring them

• By logging them to the console

• By clamping values to fit within data types

• By converting them to JavaScript errors

What happens when you divide by zero in WebAssembly?

• It causes a runtime error

• It continues execution without any issue

• It returns Infinity

• It logs a warning

How can exceptions be made to bubble up to JavaScript in WebAssembly?

• By using a special JavaScript library

• By enabling a specific compile option

• By writing custom error handlers

• By using a different programming language

What is the default behavior of C exceptions in WebAssembly?

• They are ignored

• They terminate the program

• They are converted to JavaScript exceptions

• They are logged to the console