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rust/compiler/rustc_codegen_llvm
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Stuart Cook 3b22c21dd8
Rollup merge of #140847 - Zalathar:unused-local-file, r=SparrowLii 
coverage: Detect unused local file IDs to avoid an LLVM assertion

Each function's coverage metadata contains a *local file table* that maps local file IDs (used by the function's mapping regions) to global file IDs (shared by all functions in the same CGU).

LLVM requires all local file IDs to have at least one mapping region, and has an assertion that will fail if it detects a local file ID with no regions. To make sure that assertion doesn't fire, we need to detect and skip functions whose metadata would trigger it.

(This can't actually happen yet, because currently all of a function's spans must belong to the same file and expansion. But this will be an important edge case when adding expansion region support.)
2025-05-19 21:10:42 +10:00
..
src Rollup merge of #140847 - Zalathar:unused-local-file, r=SparrowLii 2025-05-19 21:10:42 +10:00
Cargo.toml don't depend on rustc_attr_parsing if rustc_data_structures will do 2025-05-09 23:16:55 +02:00
messages.ftl KCFI: Add KCFI arity indicator support 2025-04-05 04:05:04 +00:00
README.md mv compiler to compiler/ 2020-08-30 18:45:07 +03:00

README.md

The codegen crate contains the code to convert from MIR into LLVM IR, and then from LLVM IR into machine code. In general it contains code that runs towards the end of the compilation process.

For more information about how codegen works, see the rustc dev guide.