OSDT Weekly 第55期

近期线下活动

下次 OSDT Meetup 的时间是7月26日周日上午10点。CFP和已经报名的信息可以从活动页面查看。

已经报名的话题：

• Mohanson - 如何通过 LLVM-9 将 WebAssembly WASI 程序翻译到 x86/RISC-V ELF 程序(AOT)
• MaskRay - 讨论 RISC-V Linker Relaxation 的弊端（狗头）

编译社区的八卦信息

GCC

• Gary O'block询问dataflow相关的问题. Default defs question https://gcc.gnu.org/pipermail/gcc/2020-July/233151.html

  Gary的主业似乎是雕刻家，国外的hacker玩票性质咋这么多 http://www.bronzedreams.com/about.html

• 华为关于VLIW寄存器分配相关的优化 [PATCH PR95696] regrename creates overlapping register allocations for vliw https://gcc.gnu.org/pipermail/gcc-patches/2020-July/550162.html

• [PATCH][GCC][aarch64] Generation of adjusted ldp/stp for vector types https://gcc.gnu.org/pipermail/gcc-patches/2020-July/550353.html

• [PATCH 0/4] testsuite: Add markers for default_packed targets https://gcc.gnu.org/pipermail/gcc-patches/2020-July/550307.html

• Richard Biener关于强连通排序的改进 [PATCH] [RFC] Sort region RPO according to SCC membership https://gcc.gnu.org/pipermail/gcc-patches/2020-July/550296.html

• RISC-V关于堆栈保护机制的后端改进 [PATCH v2] [RISC-V] Add support for TLS stack protector canary access https://gcc.gnu.org/pipermail/gcc-patches/2020-July/550265.html

• [PATCH 0/3] MSP430: Improve code-generation for shift instructions https://gcc.gnu.org/pipermail/gcc-patches/2020-July/550391.html

Binutils/GDB

• Power10 stub selection https://sourceware.org/pipermail/binutils/2020-July/112453.html

• SHF_LINK_ORDER's original semantics make upgrade difficult https://sourceware.org/pipermail/binutils/2020-July/112401.html

• [PATCH] ld: Properly override the IR definition https://sourceware.org/pipermail/binutils/2020-July/112476.html

GLIBC

• 值得关注:massive increase of the size of the library https://sourceware.org/pipermail/libc-alpha/2020-July/116521.html

• [PATCH 0/5] Linux: lchmod and AT_SYMLINK_NOFOLLOW support for fchmodat https://sourceware.org/pipermail/libc-alpha/2020-July/116512.html

• New x86-64 micro-architecture levels https://sourceware.org/pipermail/libc-alpha/2020-July/116225.html

• [PATCH] AArch64: Align ENTRY to a cacheline https://sourceware.org/pipermail/libc-alpha/2020-July/116358.html

• [PATCH 00/11] Fix fgetsgent_r data corruption bug (20338) https://sourceware.org/pipermail/libc-alpha/2020-July/116492.html

LLVM/Clang/LLDB/LLD

本节内容来自 LLVM Weekly 第342期， Alex Bradbury 大哥持续稳定输出。

• LLVM 11 has now branched.

• Vince Bridges will be hosting an online LLVM meetup on Wed July 22 at 6.30pm Central US time and will be presenting on how to write a new static analysis checker.

• David Blaikie proposed switching lld to match ld.bfd "tombstoning" behaviour by default. This relates to resolving relocations from debug sections to dead code.

MaskRay 又一次被 Alex 注意到了：

• Fangrui Song started a discussion about specifying multiple independent tests in one file.

• ORC JIT Weekly #17 is out. Initial JITLink support for ELF/x86-64 has landed, along with new APIs for target process control.

终于有基于机器学习的 inlining 算法被应用了？

• A machine learning-based native size estimator has been added for training the -Oz inliner. 83080a2.

RISC-V in China

本周新闻还是蛮多的：

• 由 CRVA 举办的 CRVS2020 活动在7月18日圆满结束，会议的录像也已经在活动的官网了。 http://crva.ict.ac.cn/crvs2020/

• RISC-V Global Forum 2020 的议程出来了。恭喜澎峰科技、Andes、FutureWei等同行。 https://events.linuxfoundation.org/riscv-global-forum/program/schedule/

• 过去一周有两个 V8 for RISC-V 的团队进行了开源。目前两个团队已经决定合并成一个 codebase： https://github.com/v8-riscv/v8/wiki

• David Patterson 领衔的 RIOS Lab 发布了全球首个可运行Linux的全开源RISC-V微型电脑系统PicoRio项目，用于构建更透明、低功耗、定制能力强的高效能边缘计算平台。 https://wxn.qq.com/cmsid/20200721A0T03D00

TVM 社区

风平浪静。

Mozilla

风平浪静。

• Firefox Weekly Issue 76 https://blog.nightly.mozilla.org/2020/07/17/these-weeks-in-firefox-issue-76/

方舟开源编译器社区

• Wen Hu 在方舟邮件列表投稿：

OpenArkCompiler 孵化器里发布了更新的mapleall和全新的maple engine。可以编译运行java代码。 https://gitee.com/harmonyos/OpenArkCompiler/issues/I1OHE5

mapleall https://gitee.com/openarkcompiler-incubator/mapleall

maple engine https://gitee.com/openarkcompiler-incubator/maple_engine

• 小乖他爹的方舟 Weekly 继续更：

OpenArkCompiler Weekly - #20 July 19th 2020

社区动态：

1、方舟编译器周报（OpenArkCompiler Weekly）将历史周报1~19期都在github做了备份，后续github也会同时发布。

https://github.com/isrc-cas/arkcompiler-materials

2、方舟编译器社区的wiki现在整理出了三份文档：“Pull Request及门禁指南”、“MailList指南”和“方舟编译器孵化器”。

https://gitee.com/harmonyos/OpenArkCompiler/wikis/

Commits:

1、update scan-auto for EXPECTED

https://gitee.com/harmonyos/OpenArkCompiler/commit/eefac25a02b5afefeeeaf4452807fe0764efa320

2、revised based on some reviewer's comments

https://gitee.com/harmonyos/OpenArkCompiler/commit/404085f17b61e6ed48d26fc93f358bb1a98eaeef

其它社区八卦

欢迎感兴趣的小伙伴提 Pull Requests 完善内容。 我们希望能够尽可能多的扩展下OSDT的覆盖范围。

This Week in Rust: 更了 https://this-week-in-rust.org/blog/2020/07/21/this-week-in-rust-348/

Golang Weekly: 更了 https://golangweekly.com/issues/321

WebAssembly Weekly: 鸽了 https://wasmweekly.news/issue-123/

Academic

风平浪静。

本周工具链岗位

PLCT Lab 持续招聘实习生和全职员工。 https://mp.weixin.qq.com/s/mKmZlbZYyMdT3FT-gJjcWA

没有新的岗位，已经发布的岗位都是长期招聘的。有经验的编译器工程师始终是很抢手的。PLCT实验室的实习生也一直在招聘。

本周推荐阅读

本周推荐：《我可以咬一口吗》

作者: [美] 莉兹·克里莫

译者: 周高逸

是一本字很少的漫画集。包含了几十个动物之间的小故事。有的笑话很冷，也很温暖。或许网上也有翻拍，搜索一下就可以看完，不过，偶尔捧在手里的感觉是不一样的。