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Auto merge of rust-lang#128021 - compiler-errors:rollup-o6tcn60, r=co…
…mpiler-errors Rollup of 7 pull requests Successful merges: - rust-lang#126450 (Promote Mac Catalyst targets to Tier 2, and ship with rustup) - rust-lang#127177 (Distribute rustc_codegen_cranelift for arm64 macOS) - rust-lang#127510 (Rewrite `test-float-parse` in Rust) - rust-lang#127720 ([`macro_metavar_expr_concat`] Allow `concat` in repetitions) - rust-lang#127734 (Windows: move BSD socket shims to netc) - rust-lang#127839 (Fix git safe-directory path for docker images) - rust-lang#128005 (Remove _tls_used hack) r? `@ghost` `@rustbot` modify labels: rollup
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| # Float Parsing Tests | ||
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| These are tests designed to test decimal to float conversions (`dec2flt`) used | ||
| by the standard library. | ||
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| It consistes of a collection of test generators that each generate a set of | ||
| patterns intended to test a specific property. In addition, there are exhaustive | ||
| tests (for <= `f32`) and fuzzers (for anything that can't be run exhaustively). | ||
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| The generators work as follows: | ||
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| - Each generator is a struct that lives somewhere in the `gen` module. Usually | ||
| it is generic over a float type. | ||
| - These generators must implement `Iterator`, which should return a context type | ||
| that can be used to construct a test string (but usually not the string | ||
| itself). | ||
| - They must also implement the `Generator` trait, which provides a method to | ||
| write test context to a string as a test case, as well as some extra metadata. | ||
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| The split between context generation and string construction is so that we can | ||
| reuse string allocations. | ||
| - Each generator gets registered once for each float type. Each of these | ||
| generators then get their iterator called, and each test case checked against | ||
| the float type's parse implementation. | ||
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| Some generators produce decimal strings, others create bit patterns that need to | ||
| be bitcasted to the float type, which then uses its `Display` implementation to | ||
| write to a string. For these, float to decimal (`flt2dec`) conversions also get | ||
| tested, if unintentionally. | ||
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| For each test case, the following is done: | ||
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| - The test string is parsed to the float type using the standard library's | ||
| implementation. | ||
| - The test string is parsed separately to a `BigRational`, which acts as a | ||
| representation with infinite precision. | ||
| - The rational value then gets checked that it is within the float's | ||
| representable values (absolute value greater than the smallest number to round | ||
| to zero, but less less than the first value to round to infinity). If these | ||
| limits are exceeded, check that the parsed float reflects that. | ||
| - For real nonzero numbers, the parsed float is converted into a rational using | ||
| `significand * 2^exponent`. It is then checked against the actual rational | ||
| value, and verified to be within half a bit's precision of the parsed value. | ||
| Also it is checked that ties round to even. | ||
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| This is all highly parallelized with `rayon`; test generators can run in | ||
| parallel, and their tests get chunked and run in parallel. | ||
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| There is a simple command line that allows filtering which tests are run, | ||
| setting the number of iterations for fuzzing tests, limiting failures, setting | ||
| timeouts, etc. See `main.rs` or run with `--help` for options. | ||
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| Note that when running via `./x`, only tests that take less than a few minutes | ||
| are run by default. Navigate to the crate (or pass `-C` to Cargo) and run it | ||
| directly to run all tests or pass specific arguments. |
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