[Clang] Permit noescape on non-pointer types #9789
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In modern C++ we often use span, string_view or other view objects instead of raw pointers. This PR opens the door to mark those noescape. This can be useful to document the API contracts, for interop with memory safe languages like Swift or Rust, and possibly in the future to implement take this into account in codegen. The PR also adds a feature test macro. The goal is to help avoiding warnings when the code is compiler by earlier versions of clang that does not permit this attribute on non-pointer types. rdar://140196481
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I am not sure yet if this would land upstream, but we definitely need this downstream. Upstream PR: llvm#117344 |
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@swift-ci please test LLVM |
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@swift-ci please test |
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In modern C++ we often use span, string_view or other view objects instead of raw pointers. This PR opens the door to mark those noescape. This can be useful to document the API contracts, for interop with memory safe languages like Swift or Rust, and possibly in the future to implement take this into account in codegen.
The PR also adds a feature test macro. The goal is to help avoiding warnings when the code is compiler by earlier versions of clang that does not permit this attribute on non-pointer types.
rdar://140196481