3e20bae827
Fix compile time regression and memory leak In the previous change, we saw: - Memory leak: https://lab.llvm.org/buildbot/#/builders/169/builds/5193 - 0.5% Compile time regression [link](https://llvm-compile-time-tracker.com/compare.php?from=4a68e4cbd2423dcacada8162ab7c4bb8d7f7e2cf&to=8c4331c1abeb33eabf3cdbefa7f2b6e0540e7f4f&stat=instructions:u) For compile time regression, we make the Param->Idx `StringMap` for **all** functions. This `StringMap` is expensive and should not be computed when none of the params are annotated with `[[clang::lifetime_capture_by(X)]]`. For the memory leak, the small vectors used in Attribute are not destroyed because the attributes are allocated through ASTContext's allocator. We therefore need a raw array in this case.
C language Family Front-end
Welcome to Clang.
This is a compiler front-end for the C family of languages (C, C++ and Objective-C) which is built as part of the LLVM compiler infrastructure project.
Unlike many other compiler frontends, Clang is useful for a number of things beyond just compiling code: we intend for Clang to be host to a number of different source-level tools. One example of this is the Clang Static Analyzer.
If you're interested in more (including how to build Clang) it is best to read the relevant websites. Here are some pointers:
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Information on Clang: http://clang.llvm.org/
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Building and using Clang: http://clang.llvm.org/get_started.html
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Clang Static Analyzer: http://clang-analyzer.llvm.org/
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Information on the LLVM project: http://llvm.org/
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