Translate C integer types to portable Rust types #1266
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Looks like I need to learn how to update snapshot tests. |
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I'm seeing testsuite failures (type errors caused by differing primitive types in arithmetic) that I can't reproduce locally or on donna. I assume this has to do with type translation failing on Ubuntu 22.04 for some reason. |
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I'm seeing testsuite failures (type errors caused by differing primitive types in arithmetic) that I can't reproduce locally or on donna. I assume this has to do with type translation failing on Ubuntu 22.04 for some reason.
Are they using different LLVM/clang versions?
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The remaining testsuite failures appear to be panics from (expected) arithmetic overflows that get caught in debug mode. EDIT: solved by #1273, will rebase out of this series when it lands. |
it's hard to link against libc with a direct rustc invocation. since we're testing output itself, transpiling it every time isn't critical.
by moving child generation into the trait, we avoid explicit reference to the TypedAstContext this is simpler because the only impl of this trait already stores the TypedAstContext itself, and by avoiding such aliasing we enable later implementations of mutable visitors this also allows impls of the trait to choose between all-types and only-exprs node children
this is necessary to normalize AST types between Clang 15 and below, which resolve typedefs in expression types, and Clang 16 and above, which preserve typedefs in these positions because we reify some typedef types such as `size_t`, we always want the latter behavior
this clarifies which variables refer to the same quantity in different functions this commit should have no functional changes
Co-authored-by: Khyber Sen <[email protected]>
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I think I've addressed all the comments here, and tests are green. Merging. |
info adapted from immunant/c2rust#1266 (review)
This substantially improves our fidelity of type translation for common integral types. We now recognize types like
size_tanduint8_tand convert them to the appropriate platform-independent Rust types. This is nontrivial because C-the-language does not have exact-width types and instead defines them via platform-dependent mappings to types with platform-dependent sizes, such asunsigned longandunsigned char. We have to preëmpt Clang to introduce a distinction between these types and "native" C ones when we convert the AST after exporting; to make effective use of this type information in translation we need to pass the expected type of the translated expression downward through conversion of expressions and statements.