llvm

GCC 4.0, 4.2 and LLVM ABI Compatibility

由 雨燕双飞 提交于 2019-12-29 07:03:30
问题 Are the three main compiler flavors supported by Xcode (gcc 4.0, 4.2, and llvm) binary-compatible with one another? What kind of gotchas and corner cases should I be aware of when bringing a multi-library project up to speed with the most recent Xcode tools? 回答1: Clang is ABI-compatible with code generated by gcc. Clang also includes experimental support for some newer Objective-C ABIs, but compiling for the newer ABI requires flags, and generated code can be mixed with GCC-generated code

A Tour to LLVM IR

由 百般思念 提交于 2019-12-28 17:12:28
https://zhuanlan.zhihu.com/p/66793637 https://zhuanlan.zhihu.com/p/66909226 内容概要 什么是LLVM IR?如何得到IR? LLVM编译的流程，IR文件之间的链接简介 C++ name mangling的用途，“extern C"作用的极简介绍 IR文件的布局 IR中函数定义的结构，什么是BB，什么是CFG IR是一个强类型语言，如何用工具检查IR的合法性 如何理解 Language reference 常见的terminator instruction介绍 如何利用工具得到函数的CFG 什么是SSA？SSA的好处和问题，以及如何解决这个问题 参考文献 what is tail reursion make clang compile to ll -cc1的含义 clang和clang++的区别 what is a linkage unit? LLVM LanguageRef extern "C"的作用 what is name mangling what is static single assignment? what is reaching definition? 1. 什么是LLVM IR？ LLVM IR 是 LLVM Intermediate Representation，它是一种 low

clang: how to list supported target architectures?

由 非 Y 不嫁゛ 提交于 2019-12-28 07:35:12
问题 Currently I am interested in ARM in general and specifically iphone/android targets. But I just want to know more about clang, since it feels to play important role in the years to come. I tried clang -cc1 --help|grep -i list clang -cc1 --help|grep arch|grep -v search clang -cc1 --help|grep target -triple <value> Specify target triple (e.g. i686-apple-darwin9) I know clang has -triplet parameter, but how can I list all possible values for it? I found that clang is very different to gcc in

Coordinates all wrong on iPhone 3G? It could be your compiler

由 有些话、适合烂在心里 提交于 2019-12-28 06:45:13
问题 Note: This is question to which I have already found an answer. It seems that posting a question after finding an interesting answer is encouraged, so I am posting this. Someone else is likely to have the same problem and find this useful. I have an iOS app that produces charts. Shortly after publishing an update, a user sent me this panicky email: "the latest update has modified the curves ... not seen more growth curves and inserted data are represented as a line descending ... before you

How I'm supposed to use the sanitizer in clang?

由 最后都变了- 提交于 2019-12-28 06:28:29
问题 I'm sorry if this is a uber-easy concept, but I find hard to acquire the right mindset in order to correctly use the sanitizer provided by clang . float foo(float f) { return (f / 0); } I compile this small snippet with clang++ -fsanitize=float-divide-by-zero -std=c++11 -stdlib=libc++ -c source.cpp -o osan and I also compile a "normal" version of my object without using the sanitizer clang++ -std=c++11 -stdlib=libc++ -c source.cpp -o onorm I was expecting some verbose output, or some error

How to make clang compile to llvm IR

由 杀马特。学长 韩版系。学妹 提交于 2019-12-27 12:38:42
问题 I want clang to compile my C/C++ code to LLVM bytecode rather than binary executable. How can I achieve that? And if I get the LLVM bytecode, how can I take it to further compile it to binary executable. Basically I want to add some of my own code to the LLVM bytecode before compiling to binary executable. 回答1: Given some C/C++ file foo.c : > clang -S -emit-llvm foo.c Produces foo.ll which is an LLVM IR file. The -emit-llvm option can also be passed to the compiler front-end directly, and not

How to make clang compile to llvm IR

由 落爺英雄遲暮 提交于 2019-12-27 12:37:26
问题 I want clang to compile my C/C++ code to LLVM bytecode rather than binary executable. How can I achieve that? And if I get the LLVM bytecode, how can I take it to further compile it to binary executable. Basically I want to add some of my own code to the LLVM bytecode before compiling to binary executable. 回答1: Given some C/C++ file foo.c : > clang -S -emit-llvm foo.c Produces foo.ll which is an LLVM IR file. The -emit-llvm option can also be passed to the compiler front-end directly, and not

Is there some literal dictionary or array syntax in Objective-C?

由 拥有回忆 提交于 2019-12-27 12:20:45
问题 It's always been possible to create NSArrays (and NSDictionaries/NSNumber) with vararg method calls, like: [NSArray arrayWithObjects: @"a", @"b", @"c", nil]; Can these be created with in-line literals in a new improvement to LLVM and Clang? 回答1: With this change to the LLVM codebase, Apple has added a new syntax for literals in upcoming versions of the Clang compiler. Before, arrays were created using a C-based array and were converted on the fly into Objective-C objects, such as: NSArray*

Is there some literal dictionary or array syntax in Objective-C?

由 耗尽温柔 提交于 2019-12-27 12:18:53
问题 It's always been possible to create NSArrays (and NSDictionaries/NSNumber) with vararg method calls, like: [NSArray arrayWithObjects: @"a", @"b", @"c", nil]; Can these be created with in-line literals in a new improvement to LLVM and Clang? 回答1: With this change to the LLVM codebase, Apple has added a new syntax for literals in upcoming versions of the Clang compiler. Before, arrays were created using a C-based array and were converted on the fly into Objective-C objects, such as: NSArray*

Why does this LLVM IR code produce unexpected results?

由 半城伤御伤魂 提交于 2019-12-25 18:33:47
问题 I'm getting really frustrated, since this problem has been bugging me for days, so I'd appreciate every help possible. I'm currently making my own programming language and am currently trying to implement enums and match statements that match a value to an enum case and runs the corresponding statement but I'm getting unexpected results and segfaults here and there. Here's one piece of code of my language that runs (lli) but produces unexpected results sometimes (prints 1, not 3 for some
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