disasmo's Introduction

Disasmo

VS2022 Add-in. Click on any method or class to see JIT's codegen and more.

Starting with .NET 7.0 RC1 this add-in no longer requires a local build of dotnet/runtime repo. However, it offers more features with a local one, to obtain a local one please follow these steps:

git clone git@github.com:dotnet/runtime.git
cd runtime
build.cmd Clr+Clr.Aot+Libs -c Release -rc Checked

# optional (for crossgen2 + arm64 for hw intrinsics):
build.cmd Clr.CoreLib -c Release -a arm64

See windows-requirements.md.

Release notes

See RELEASE_NOTES.md

Installation

Click on Extensions\Manage Extensions menu, select Online tab and type Disasmo in the "Search" text box. Once the add-in is installed you have to close all active instances of VS2022 to let the installer finish its job.

Features

Hot-key to quickly see codegen (Alt+Shift+D by default, can be changed in VS's settings)
Is able to show codegen for ARM64
Flowgraphs and JitDumps for JIT contributors
Diffs
"System.Runtime.Intrinsics quick search" tab
Inliner's decisions
'Run' mode. Is useful for e.g. PGO inspection

Known Issues

Only .NET 6.0 and later projects are supported with custom runtime
.NET 7.0 RC1 (or newer) is needed for non-custom runtime mode
I only tested it for simple Console Apps, but it should work for libs as well
Generic methods are only supported in 'Run' mode
Resharper hides Roslyn actions by default (Uncheck "Do not show Visual Studio Light Bulb").
The lightbulb can be slow on first launch