Rust编写的JavaScript引擎，该项目是一个试验性质的项目。

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boa/docs/img

History

Halid Odat a2964e63dd Implement instruction flowgraph generator (#2422) ... This PR is a WIP implementation of a vm instruction flowgraph generator This aims to make the vm easier to debug and understand for both newcomers and experienced devs. For example if we have the following code: ```js let i = 0; while (i < 10) { if (i == 3) { break; } i++; } ``` It generates the following instructions (which is hard to read, especially jumps): <details> ``` ----------------------Compiled Output: '<main>'----------------------- Location Count Opcode Operands 000000 0000 PushZero 000001 0001 DefInitLet 0000: 'i' 000006 0002 LoopStart 000007 0003 LoopContinue 000008 0004 GetName 0000: 'i' 000013 0005 PushInt8 10 000015 0006 LessThan 000016 0007 JumpIfFalse 78 000021 0008 PushDeclarativeEnvironment 0, 1 000030 0009 GetName 0000: 'i' 000035 0010 PushInt8 3 000037 0011 Eq 000038 0012 JumpIfFalse 58 000043 0013 PushDeclarativeEnvironment 0, 0 000052 0014 Jump 78 000057 0015 PopEnvironment 000058 0016 GetName 0000: 'i' 000063 0017 IncPost 000064 0018 RotateRight 2 000066 0019 SetName 0000: 'i' 000071 0020 Pop 000072 0021 PopEnvironment 000073 0022 Jump 7 000078 0023 LoopEnd Literals: <empty> Bindings: 0000: i Functions: <empty> ``` </details> And the flow graph is generated:  The beginning of the function is marked by the `start` node (in green) and end (in red). In branching the "yes" branch is marked in green and "no" in red. ~~This only generates in [graphviz format](https://en.wikipedia.org/wiki/DOT_(graph_description_language)) (a widely used format) but it would be nice to also generate to a format that `mermaid.js` can understand and that could be put in articles https://github.com/boa-dev/boa-dev.github.io/issues/26~~ TODO: - [x] Generate graphviz format - [x] Generate mermaid format - [x] Programmatically generate colors push and pop env instructions - [x] Display nested functions in sub-sub-graphs. - [x] Put under a feature (`"flowgraph"`) - [x] Handle try/catch, switch instructions - [x] CLI option for configuring direction of flow (by default it is top down) - [x] Handle `Throw` instruction (requires keeping track of try blocks) - [x] Documentation - [x] Prevent node name collisions (functions with the same name)		2 years ago
..
boaTest.gif	updating gif	6 years ago
boa_architecture.drawio.png	Refresh vm docs and fix bytecode trace output (#1921)	3 years ago
graphviz_flowgraph.svg	Implement instruction flowgraph generator (#2422)	2 years ago
latestDemo.gif	let and const now partially supported (#18)	6 years ago
object_specialization_after.png	v0.9 changelog (#528)	4 years ago
object_specialization_before.png	v0.9 changelog (#528)	4 years ago
parser-graph.png	update changelog for upcoming 0.7.0 (#271)	5 years ago
profiler.png	Profiler using measureme (#317)	4 years ago