Module covfun 

For each function that was instrumented for coverage, we need to embed its corresponding coverage mapping metadata inside the __llvm_covfun¹ linker section of the final binary.

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1. On Windows the section name is .lcovfun. ↩

Re-exports

use std::ffi::CString; 🔒

use std::iter; 🔒

use std::sync::Arc; 🔒

use rustc_abi::Align; 🔒

use rustc_codegen_ssa::traits::BaseTypeCodegenMethods as _; 🔒

use rustc_codegen_ssa::traits::ConstCodegenMethods; 🔒

use rustc_index::IndexVec; 🔒

use rustc_middle::mir::coverage::BasicCoverageBlock; 🔒

use rustc_middle::mir::coverage::CounterId; 🔒

use rustc_middle::mir::coverage::CovTerm; 🔒

use rustc_middle::mir::coverage::CoverageCodegenInfo; 🔒

use rustc_middle::mir::coverage::Expression; 🔒

use rustc_middle::mir::coverage::ExpressionId; 🔒

use rustc_middle::mir::coverage::Mapping; 🔒

use rustc_middle::mir::coverage::MappingKind; 🔒

use rustc_middle::mir::coverage::Op; 🔒

use rustc_middle::ty::Instance; 🔒

use rustc_middle::ty::TyCtxt; 🔒

use rustc_span::SourceFile; 🔒

use rustc_span::Span; 🔒

use rustc_target::spec::HasTargetSpec; 🔒

use tracing::debug; 🔒

use crate::common::CodegenCx; 🔒

use crate::coverageinfo::mapgen::GlobalFileTable; 🔒

use crate::coverageinfo::mapgen::LocalFileId; 🔒

use crate::coverageinfo::mapgen::spans; 🔒

use crate::coverageinfo::ffi; 🔒

use crate::coverageinfo::llvm_cov; 🔒

use crate::llvm; 🔒

Structs

BranchMapping 🔒

Resolved from MappingKind::Branch, and the precursor to ffi::BranchRegion.

CodeMapping 🔒

Resolved from MappingKind::Code, and the precursor to ffi::CodeRegion.

CovfunRecord 🔒

Intermediate coverage metadata for a single function, used to help build the final record that will be embedded in the __llvm_covfun section.

ResolvedMappings 🔒

Intermediate representation of coverage mappings, after all mapping spans have been resolved to file coordinates (or discarded), but before producing a final llvm_cov::Regions.

Functions

counter_for_term 🔒

emit_covfun_record 🔒

Generates and emits the covfun record for this function, which contains the function’s coverage mapping data. The record is emitted as a global variable in the __llvm_covfun section.

fill_region_tables 🔒

Populates the mapping region tables for the current function’s covfun record.

prepare_covfun_record 🔒

prepare_expressions 🔒

Convert the function’s coverage-counter expressions into a form suitable for FFI.

prepare_resolved_mappings 🔒