ee655ca27a
This extends CaptureTracking to support inferring non-trivial CaptureInfos. The focus of this patch is to only support FunctionAttrs, other users of CaptureTracking will be updated in followups. The key API changes here are: * DetermineUseCaptureKind() now returns a UseCaptureInfo where the UseCC component specifies what is captured at that Use and the ResultCC component specifies what may be captured via the return value of the User. Usually only one or the other will be used (corresponding to previous MAY_CAPTURE or PASSTHROUGH results), but both may be set for call captures. * The CaptureTracking::captures() extension point is passed this UseCaptureInfo as well and then can decide what to do with it by returning an Action, which is one of: Stop: stop traversal. ContinueIgnoringReturn: continue traversal but don't follow the instruction return value. Continue: continue traversal and follow the instruction return value if it has additional CaptureComponents. For now, this patch retains the (unsound) special logic for comparison of null with a dereferenceable pointer. I'd like to switch key code to take advantage of address/address_is_null before dropping it. This PR mainly intends to introduce necessary API changes and basic inference support, there are various possible improvements marked with TODOs.
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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If you have questions or comments about Clang, a great place to discuss them is on the Clang forums:
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If you find a bug in Clang, please file it in the LLVM bug tracker: