Struct CguCoverageContext

pub(crate) struct CguCoverageContext<'ll, 'tcx> {
    pub(crate) pgo_func_name_var_map: RefCell<FxIndexMap<Instance<'tcx>, &'ll Value>>,
    pub(crate) mcdc_condition_bitmap_map: RefCell<FxHashMap<Instance<'tcx>, Vec<&'ll Value>>>,
    covfun_section_name: OnceCell<CString>,
}

Extra per-CGU context/state needed for coverage instrumentation.

Fields

pgo_func_name_var_map: RefCell<FxIndexMap<Instance<'tcx>, &'ll Value>>

Associates function instances with an LLVM global that holds the function’s symbol name, as needed by LLVM coverage intrinsics.

Instances in this map are also considered “used” for the purposes of emitting covfun records. Every covfun record holds a hash of its symbol name, and llvm-cov will exit fatally if it can’t resolve that hash back to an entry in the binary’s __llvm_prf_names linker section.

mcdc_condition_bitmap_map: RefCell<FxHashMap<Instance<'tcx>, Vec<&'ll Value>>>

covfun_section_name: OnceCell<CString>

Implementations

impl<'ll, 'tcx> CguCoverageContext<'ll, 'tcx>

pub(crate) fn new() -> Self

fn try_get_mcdc_condition_bitmap( &self, instance: &Instance<'tcx>, decision_depth: u16, ) -> Option<&'ll Value>

LLVM use a temp value to record evaluated mcdc test vector of each decision, which is called condition bitmap. In order to handle nested decisions, several condition bitmaps can be allocated for a function body. These values are named mcdc.addr.{i} and are a 32-bit integers. They respectively hold the condition bitmaps for decisions with a depth of i.

pub(crate) fn instances_used(&self) -> Vec<Instance<'tcx>>

Returns the list of instances considered “used” in this CGU, as inferred from the keys of pgo_func_name_var_map.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 120 bytes