873d6bc3b4
Local variables passed by non-const pointer or reference to a function were previously invalidated in the LocalVariableMap (VarMapBuilder), on the assumption that the callee might change what they point to. This caused false positives when the function also carries ACQUIRE/RELEASE annotations: handleCall translates those annotations with the pre-call context, while subsequent guard checks use the post-invalidation context, producing an expansion mismatch and a spurious warning. The invalidation rules were a heuristic with significant complexity (including a special-case carve-out for std::bind/bind_front) and unclear benefit. Instead of adding more heuristics, drop the alias-invalidation rules entirely. Discussion: https://github.com/llvm/llvm-project/pull/183640
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.
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