Structures in C: From Basics to Memory Alignment
Structures allow us to combine several variables to create a new data type. Some other languages support the same concept but call it “recordsâ€. If you come from object-oriented programming you can think about them as classes without methods. Declaration A structure is declared by the keyword struct followed by the name of the new structure and a list of its members enclosed in parentheses: Here w
Making it harder to do wrong | daniel.haxx.se
You know I spend all my days working on curl and related matters. I also spend a lot of time thinking on the project; like how we do things and how we should do things. The security angle of this project is one of the most crucial ones and an area where I spend a lot of time and effort. Dealing with and assessing security reports, handling the verified actual security vulnerabilities and waiving o
Using Zig to Unit Test a C Application
Zig is a new, independently developed low-level programming language. It’s a modern reimagining of C that attempts to retain C’s performance while embracing improvements from the last 30 years of tooling and language design. Zig makes calling into C code easier than any other language I’ve used. Zig also treats unit testing as a first-class feature, which the C language certainly does not. These t
A Modern C Development Environment
Webinar: How New IoT Security Regulations Will Shape the Industry’s Future - Tuesday, Sept. 17th @ 9AM PT | 12PM ET | 6PM CET | RSVP Now Sometimes, C/C++ projects have a long development cycle. When working on such a project, it can be easy to take our development environment for granted, and forget about the effort invested in its bring-up. The build environment works like magic, the test framewo
APIã¨ã‹ABIã¨ã‹ã‚·ã‚¹ãƒ†ãƒ コールã¨ã‹ - 覚書
ã¯ã˜ã‚㫠本記事ã¯Linux環境ã«ãŠã‘る次ã®ã‚ˆã†ãªã“ã¨ã‚’ã–ã£ãã‚Šç†è§£ã™ã‚‹ãŸã‚ã®è¨˜äº‹ã§ã™ã€‚ Application Programming Interface(API)ã£ã¦ä½•? Application Binary Interface(ABI)ã£ã¦ä½•? システムコールã¨APIã¨ABIã®é–¢ä¿‚ã£ã¦ï¼Ÿ ãã‚Œãžã‚Œä½•ãŒã©ã†é•ã†ã®? ã“ã®æ‰‹ã®æƒ…å ±ã¯ã‚°ã‚°ã‚Œã°wikipediaやらã«ã„ã‚ã„ã‚æƒ…å ±ãŒè¼‰ã£ã¦ã‚‹ã‚“ã§ã™ãŒã€åˆå¿ƒè€…ãŒç†è§£ã™ã‚‹ã«ã¯ç´°ã‹ã„ã“ã¨ã¾ã§æ›¸ã‹ã‚Œã™ãŽã¦ã„ã¦ã€ã‹ã¤ã€ãã‚Œãžã‚Œã®é–¢ä¿‚ãŒã‚ã‹ã‚Šã«ãã„ã§ã™ã€‚ãªã®ã§ã€ç”¨èªžã‚’é€ä¸€è§£èª¬ã™ã‚‹ã®ã§ã¯ãªãã€ã‚ã‚ŠãŒã¡ãªè³ªå•ã®QAã¨ã„ã†å½¢ã‚’ã¨ã‚Šã¾ã—ãŸã€‚人ã«ã‚ˆã£ã¦ç”¨èªžã®æ„味ã®æºã‚‰ãŽãŒã‚ã£ãŸã‚Šã™ã‚‹ã‚“ã§ã™ãŒã€ç§ã®è§£é‡ˆã¨ã„ã†ã“ã¨ã§ã€‚ã‚ã‹ã‚‰ã•ã¾ã«é–“é•ã£ã¦ã„ãŸã‚‰æŒ‡æ‘˜ã—ã¦ã„ãŸã ã‘ã‚‹ã¨å¬‰ã—ã„ã§ã™ã€‚ ã“れを書ã“ã†ã¨æ€ã£ãŸãã£ã‹ã‘ã¯ã€ä»¥å‰ã“ã‚“ãªtweetを見ã‹ã‘ãŸã“ã¨ã§ã™ã€‚ãã‚Œã‹ã‚‰ã€Œãã†ã„ãˆã°æœ€
QuickJS Javascript Engine
News 2024-01-13: New release (Changelog) 2023-12-09: New release (Changelog) Introduction QuickJS is a small and embeddable Javascript engine. It supports the ES2023 specification including modules, asynchronous generators, proxies and BigInt. It optionally supports mathematical extensions such as big decimal floating point numbers (BigDecimal), big binary floating point numbers (BigFloat) and ope
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ã¯ã˜ã‚ã« ã“ã®ã‚ªãƒ³ãƒ©ã‚¤ãƒ³ãƒ–ックã¯åŸ·ç†ä¸ã§ã™ã€‚完æˆç‰ˆã§ã¯ã‚ã‚Šã¾ã›ã‚“。フィードãƒãƒƒã‚¯ãƒ•ã‚©ãƒ¼ãƒ ã“ã®æœ¬ã«ã¯ä¸€å†Šã®æœ¬ã«ç››ã‚Šè¾¼ã‚€ã«ã¯ã‚„や欲張りãªå†…容を詰ã‚è¾¼ã¿ã¾ã—ãŸã€‚本書ã§ã¯ã€C言語ã§æ›¸ã‹ã‚ŒãŸã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚’アセンブリ言語ã«å¤‰æ›ã™ã‚‹ãƒ—ãƒã‚°ãƒ©ãƒ ã€ã¤ã¾ã‚ŠCコンパイラを作æˆã—ã¾ã™ã€‚コンパイラãã®ã‚‚ã®ã‚‚Cを使ã£ã¦é–‹ç™ºã—ã¾ã™ã€‚当é¢ã®ç›®æ¨™ã¯ã‚»ãƒ«ãƒ•ãƒ›ã‚¹ãƒˆã€ã™ãªã‚ã¡è‡ªä½œã‚³ãƒ³ãƒ‘イラã§ãれ自身ã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚’コンパイルã§ãるよã†ã«ã™ã‚‹ã“ã¨ã§ã™ã€‚ ã“ã®æœ¬ã§ã¯ã€ã‚³ãƒ³ãƒ‘イラã®èª¬æ˜Žã®é›£æ˜“度ãŒæ€¥ã«ä¸ŠãŒã‚Šã™ãŽãªã„よã†ã«ã€æ§˜ã€…ãªãƒˆãƒ”ックを本書全体を通ã˜ã¦æ¬¡ç¬¬ã«æŽ˜ã‚Šä¸‹ã’ã¦ã„ãã¨ã„ã†å½¢ã§èª¬æ˜Žã™ã‚‹ã“ã¨ã«ã—ã¾ã—ãŸã€‚ãã®ç†ç”±ã¯æ¬¡ã®ã¨ãŠã‚Šã§ã™ã€‚ コンパイラã¯ã€æ§‹æ–‡è§£æžã€ä¸é–“パスã€ã‚³ãƒ¼ãƒ‰ç”Ÿæˆã¨ã„ã£ãŸè¤‡æ•°ã®ã‚¹ãƒ†ãƒ¼ã‚¸ã«æ¦‚念的ã«åˆ†å‰²ã™ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚よãã‚る教科書的アプãƒãƒ¼ãƒã§ã¯ã€ãã‚Œãžã‚Œã®ãƒˆãƒ”ックã«ã¤ã„ã¦ç« ã‚’ç«‹ã¦ã¦è§£èª¬ã‚’è¡Œã†ã“ã¨ã«ãªã‚Šã¾ã™ãŒã€ãã®ã‚ˆã†
GitHub - yrm006/miniscript: A tiny ECMAScript(JavaScript,JS) engine. This need only 8kB for ROM and need only 1kB for RAM.
// MINIScript // --- // - Building // [osx] // $ gcc -m32 miniscript.c mslib.c readme.c && ./a.out < sample.js // [arm thumb size] // $ ~/gcc-arm-none-eabi-4_9-2015q2/bin/arm-none-eabi-gcc -c -mthumb -Os miniscript.c // $ ~/gcc-arm-none-eabi-4_9-2015q2/bin/arm-none-eabi-size -A miniscript.o // - Changes // [0.1] 2016.03.11 // + code parser // + allocation: var // + operators: =,+,- // + statement:
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[What Every C Programmer Should Know About Undefined Behavior #1/3 ã®ç¿»è¨³ã§ã™ã€‚] LLVMã§ã‚³ãƒ³ãƒ‘イルã—ãŸã‚³ãƒ¼ãƒ‰ã¯ã€æœ€é©åŒ–を有効ã«ã—ã¦ã„ã‚‹ã¨ãŸã¾ã«SIGTRAPシグナルを生æˆã™ã‚‹ã®ã¯ãªãœãªã®ã‹ã€ã¨èžã‹ã‚Œã‚‹ã“ã¨ãŒã‚る。ã„ã‚ã„ã‚調ã¹ãŸã‚ã¨ã€(X86ã§ã®è©±ã ãŒ) Clang㯠"ud2" インストラクションを生æˆã—ã¦ã„ãŸã“ã¨ãŒã‚ã‹ã£ãŸã€‚"ud2" ã¯__builtin_trap()ãŒç”Ÿæˆã™ã‚‹ã‚¤ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚·ãƒ§ãƒ³ã¨åŒã˜ã‚‚ã®ã 。[訳注: #UD例外を発生ã•ã›ã‚‹å‘½ä»¤ã€‚ソフトウェアãŒ#UD例外をãƒãƒ³ãƒ‰ãƒ«ã§ãã¦ã„ã‚‹ã‹ãƒ†ã‚¹ãƒˆã™ã‚‹ãŸã‚ã«ä½¿ã‚れる。ã¤ã¾ã‚Šã€ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ãŒæœªå®šç¾©ãªæŒ¯ã‚‹èˆžã„を使ã£ã¦ã„ãŸã‹ã‚‰ã€LLVMã¯ud2インストラクションを生æˆã—ãŸã®ã§ã‚ã£ã¦ã€LLVMã®ãƒã‚°ã§ã¯ãªã„ã€ã¨ã„ã†ã“ã¨] ã“ã†ã„ã†å•é¡Œã¯å¹¾ã¤ã‹ã‚ã£ã¦ã€ã™ã¹ã¦ã€Cã®æœªå®šç¾©ãªæŒ¯ã‚‹
Swift - UnsafePointerã¨ä¸Šæ‰‹ã«ä»˜ãåˆã† - Qiita
ã‚ã‚ãªã‚“ã¦ã‚‚ã£ãŸã„ãªã„誤解。 ã¨ã„ã†ã“ã¨ã§UnsafePointer.alloc()ã§ã‚¢ãƒ³ã‚»ãƒ¼ãƒ•ãªãƒ¡ãƒ¢ãƒªã‚’確ä¿ã—ã¦ã€ãã®ä¸ã«è¿”ã—ã¦ã‚‚らã£ã¦ã€åˆ©ç”¨å¾Œã«é€Ÿã‚„ã‹ã«ç ´æ£„ã™ã‚‹ã¨ã„ã†æ„Ÿã˜ã«ã—ã‹ãªã‚‰ãªã„よã†ã§ã™ã€‚ - Swiftã‹ã‚‰Machã®host_info()を呼ã³å‡ºã™(UnsafePointerã®ã‚ャスト) Cã®æ§‹é€ 体ã¯ãã®ã¾ã¾Swiftã®æ§‹é€ 体ã¨ã—ã¦ä½¿ãˆã‚‹ Cã®æ§‹é€ 体もã€Swiftã®æ§‹é€ 体ã¨åŒã˜æµå„€ã§æ‰±ãˆã¾ã™ UnsafePointer<cstruct>ã‚’è¦æ±‚ã™ã‚‹é–¢æ•°ã«ã¯ã€&cstructを渡ã™ã ã‘ã§ãŠk 実際ã«ã”覧ã„ãŸã ãã¾ã—ょã†ã€‚ import Darwin // ã‚‚ã¡ã‚ã‚“Foundationã§ã‚‚ãŠk func lastModified(path:String)->String? { var st = stat() // *1 let err = path.withCString { //
What Every C Programmer Should Know About Undefined Behavior #1/3
What Every C Programmer Should Know About Undefined Behavior #1/3 People occasionally ask why LLVM-compiled code sometimes generates SIGTRAP signals when the optimizer is turned on. After digging in, they find that Clang generated a "ud2" instruction (assuming X86 code) - the same as is generated by __builtin_trap(). There are several issues at work here, all centering around undefined behavior in
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wabt/wasm2c at main · WebAssembly/wabt · GitHub
GitHub - tree-sitter/tree-sitter: An incremental parsing system for programming tools
GitHub - andrei-markeev/ts2c: Convert Javascript/TypeScript to C
GitHub - liuliu/ccv: C-based/Cached/Core Computer Vision Library, A Modern Computer Vision Library
GitHub - tmikov/jscomp: Ahead of time JavaScript compiler
GitHub - gasman/bonsai-c: C to WebAssembly + asm.js compilation for humans
GitHub - andrewchambers/cc: Cross platform C preprocessor and compiler.
Amazon.com: Go Programming Language, The (Addison-Wesley Professional Computing Series): Donovan, Alan, Kernighan, Brian: Books
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