52a9ba7ca4
This was originally added in https://reviews.llvm.org/D142268 to have LLDB display variable typenames that benefit from suppressing defaulted template arguments. We currently represent template aliases as `DW_AT_typedef`s instead of `DW_TAG_template_alias`. This means for types like: ``` template <class _Tp> using __remove_cv_t = __remove_cv(_Tp); template <class _Tp> using remove_cv_t = __remove_cv_t<_Tp>; template<typename T> class optional { using value_type = T; remove_cv_t<value_type> __val_; } ``` we would generate DWARF like: ``` 0x0000274f: DW_TAG_typedef DW_AT_type (0x0000000000002758 "__remove_cv_t<value_type>") DW_AT_name ("remove_cv_t<value_type>") ``` This is an actual libc++ type layout introduced in https://github.com/llvm/llvm-project/pull/110355, and uncovered a shortcoming of LLDB's data-formatter infrastructure, where we cache formatters on the contents of `DW_AT_name` (which currently wouldn't be a fully resolved typename for template specializations). To unblock the libc++ change, I think we can revert this without much fallout. Then we have two options for follow-up (or do both): 1. reland this but adjust the LLDB formatter cache so it doesn't cache formatters for template specializations 2. implement support for `DW_TAG_template_alias` in LLDB (and make Clang generate them by default).
The LLVM Compiler Infrastructure
Welcome to the LLVM project!
This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.
The LLVM project has multiple components. The core of the project is itself called "LLVM". This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.
C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.
Other components include: the libc++ C++ standard library, the LLD linker, and more.
Getting the Source Code and Building LLVM
Consult the Getting Started with LLVM page for information on building and running LLVM.
For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.
Getting in touch
Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.
The LLVM project has adopted a code of conduct for participants to all modes of communication within the project.