chakra-core/ChakraCore

Make number serialization compatible with V8 (and new IETF spec draft)

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#149 创建于 2016年1月20日

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BugCompatibilitySeverity: 2Suggestionhelp wanted

描述

In order to create signed JavaScript objects, you need to normalize data.

The JCS specification https://cyberphone.github.io/openkeystore/resources/docs/jcs.html#ECMAScript_Compatibility_Mode accomplish this "automatically" by relying on ES6 for property order (which Chakra implements), but also depends on the extended number formatting algorithm used in the Google V8 engine which after testing with 100 million of random and selected values appears to be used by Chrome, Firefox, and Safari as well as "node.js".

Browser test program: http://webpki.org/ietf/es6numberbrowsertest.html

10 million value test file: http://webpki.org/ietf/es6testfile.txt

Although JCS does not (a this stage) represent a standard, the core concept will most likely become a de-facto standard due to its simplicity.

贡献者指南

技术栈
javascriptcpp
领域
backendperformance
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
5
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
over 1 week
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
stale
清晰度议题是否清楚说明期望改动、验收标准和下一步。
needs investigation
前置要求
understanding of IEEE 754 double precisionknowledge of V8 number formatting algorithmfamiliarity with ChakraCore source codeC++ programming experience
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
15
研究方向
Examine the JCS specification and the linked browser test. Identify the specific number formatting differences between ChakraCore and V8 by comparing outputs using the provided test file. Look into ChakraCore's number serialization code (likely in lib/Runtime/NumberImplementation.cpp) and V8's implementation (src/numbers/conversions.cc). Implement the required changes to match V8's behavior, ensuring compatibility with the IETF draft.