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use crate::common::CodegenCx;
use crate::coverageinfo;
use crate::coverageinfo::ffi::CounterMappingRegion;
use crate::coverageinfo::map_data::{FunctionCoverage, FunctionCoverageCollector};
use crate::llvm;
use itertools::Itertools as _;
use rustc_codegen_ssa::traits::{BaseTypeMethods, ConstMethods};
use rustc_data_structures::fx::{FxIndexMap, FxIndexSet};
use rustc_hir::def::DefKind;
use rustc_hir::def_id::DefId;
use rustc_index::IndexVec;
use rustc_middle::bug;
use rustc_middle::mir;
use rustc_middle::ty::{self, TyCtxt};
use rustc_span::def_id::DefIdSet;
use rustc_span::Symbol;
/// Generates and exports the Coverage Map.
///
/// Rust Coverage Map generation supports LLVM Coverage Mapping Format version
/// 6 (zero-based encoded as 5), as defined at
/// [LLVM Code Coverage Mapping Format](https://github.com/rust-lang/llvm-project/blob/rustc/13.0-2021-09-30/llvm/docs/CoverageMappingFormat.rst#llvm-code-coverage-mapping-format).
/// These versions are supported by the LLVM coverage tools (`llvm-profdata` and `llvm-cov`)
/// bundled with Rust's fork of LLVM.
///
/// Consequently, Rust's bundled version of Clang also generates Coverage Maps compliant with
/// the same version. Clang's implementation of Coverage Map generation was referenced when
/// implementing this Rust version, and though the format documentation is very explicit and
/// detailed, some undocumented details in Clang's implementation (that may or may not be important)
/// were also replicated for Rust's Coverage Map.
pub fn finalize(cx: &CodegenCx<'_, '_>) {
let tcx = cx.tcx;
// Ensure the installed version of LLVM supports Coverage Map Version 6
// (encoded as a zero-based value: 5), which was introduced with LLVM 13.
let version = coverageinfo::mapping_version();
assert_eq!(version, 5, "The `CoverageMappingVersion` exposed by `llvm-wrapper` is out of sync");
debug!("Generating coverage map for CodegenUnit: `{}`", cx.codegen_unit.name());
// In order to show that unused functions have coverage counts of zero (0), LLVM requires the
// functions exist. Generate synthetic functions with a (required) single counter, and add the
// MIR `Coverage` code regions to the `function_coverage_map`, before calling
// `ctx.take_function_coverage_map()`.
if cx.codegen_unit.is_code_coverage_dead_code_cgu() {
add_unused_functions(cx);
}
let function_coverage_map = match cx.coverage_context() {
Some(ctx) => ctx.take_function_coverage_map(),
None => return,
};
if function_coverage_map.is_empty() {
// This module has no functions with coverage instrumentation
return;
}
let function_coverage_entries = function_coverage_map
.into_iter()
.map(|(instance, function_coverage)| (instance, function_coverage.into_finished()))
.collect::<Vec<_>>();
let all_file_names =
function_coverage_entries.iter().flat_map(|(_, fn_cov)| fn_cov.all_file_names());
let global_file_table = GlobalFileTable::new(all_file_names);
// Encode all filenames referenced by coverage mappings in this CGU.
let filenames_buffer = global_file_table.make_filenames_buffer(tcx);
let filenames_size = filenames_buffer.len();
let filenames_val = cx.const_bytes(&filenames_buffer);
let filenames_ref = coverageinfo::hash_bytes(&filenames_buffer);
// Generate the coverage map header, which contains the filenames used by
// this CGU's coverage mappings, and store it in a well-known global.
let cov_data_val = generate_coverage_map(cx, version, filenames_size, filenames_val);
coverageinfo::save_cov_data_to_mod(cx, cov_data_val);
let mut unused_function_names = Vec::new();
let covfun_section_name = coverageinfo::covfun_section_name(cx);
// Encode coverage mappings and generate function records
for (instance, function_coverage) in function_coverage_entries {
debug!("Generate function coverage for {}, {:?}", cx.codegen_unit.name(), instance);
let mangled_function_name = tcx.symbol_name(instance).name;
let source_hash = function_coverage.source_hash();
let is_used = function_coverage.is_used();
let coverage_mapping_buffer =
encode_mappings_for_function(&global_file_table, &function_coverage);
if coverage_mapping_buffer.is_empty() {
if function_coverage.is_used() {
bug!(
"A used function should have had coverage mapping data but did not: {}",
mangled_function_name
);
} else {
debug!("unused function had no coverage mapping data: {}", mangled_function_name);
continue;
}
}
if !is_used {
unused_function_names.push(mangled_function_name);
}
save_function_record(
cx,
&covfun_section_name,
mangled_function_name,
source_hash,
filenames_ref,
coverage_mapping_buffer,
is_used,
);
}
// For unused functions, we need to take their mangled names and store them
// in a specially-named global array. LLVM's `InstrProfiling` pass will
// detect this global and include those names in its `__llvm_prf_names`
// section. (See `llvm/lib/Transforms/Instrumentation/InstrProfiling.cpp`.)
if !unused_function_names.is_empty() {
assert!(cx.codegen_unit.is_code_coverage_dead_code_cgu());
let name_globals = unused_function_names
.into_iter()
.map(|mangled_function_name| cx.const_str(mangled_function_name).0)
.collect::<Vec<_>>();
let initializer = cx.const_array(cx.type_ptr(), &name_globals);
let array = llvm::add_global(cx.llmod, cx.val_ty(initializer), "__llvm_coverage_names");
llvm::set_global_constant(array, true);
llvm::set_linkage(array, llvm::Linkage::InternalLinkage);
llvm::set_initializer(array, initializer);
}
}
/// Maps "global" (per-CGU) file ID numbers to their underlying filenames.
struct GlobalFileTable {
/// This "raw" table doesn't include the working dir, so a filename's
/// global ID is its index in this set **plus one**.
raw_file_table: FxIndexSet<Symbol>,
}
impl GlobalFileTable {
fn new(all_file_names: impl IntoIterator<Item = Symbol>) -> Self {
// Collect all of the filenames into a set. Filenames usually come in
// contiguous runs, so we can dedup adjacent ones to save work.
let mut raw_file_table = all_file_names.into_iter().dedup().collect::<FxIndexSet<Symbol>>();
// Sort the file table by its actual string values, not the arbitrary
// ordering of its symbols.
raw_file_table.sort_unstable_by(|a, b| a.as_str().cmp(b.as_str()));
Self { raw_file_table }
}
fn global_file_id_for_file_name(&self, file_name: Symbol) -> u32 {
let raw_id = self.raw_file_table.get_index_of(&file_name).unwrap_or_else(|| {
bug!("file name not found in prepared global file table: {file_name}");
});
// The raw file table doesn't include an entry for the working dir
// (which has ID 0), so add 1 to get the correct ID.
(raw_id + 1) as u32
}
fn make_filenames_buffer(&self, tcx: TyCtxt<'_>) -> Vec<u8> {
// LLVM Coverage Mapping Format version 6 (zero-based encoded as 5)
// requires setting the first filename to the compilation directory.
// Since rustc generates coverage maps with relative paths, the
// compilation directory can be combined with the relative paths
// to get absolute paths, if needed.
use rustc_session::RemapFileNameExt;
let working_dir: &str = &tcx.sess.opts.working_dir.for_codegen(tcx.sess).to_string_lossy();
llvm::build_byte_buffer(|buffer| {
coverageinfo::write_filenames_section_to_buffer(
// Insert the working dir at index 0, before the other filenames.
std::iter::once(working_dir).chain(self.raw_file_table.iter().map(Symbol::as_str)),
buffer,
);
})
}
}
rustc_index::newtype_index! {
struct LocalFileId {}
}
/// Holds a mapping from "local" (per-function) file IDs to "global" (per-CGU)
/// file IDs.
#[derive(Default)]
struct VirtualFileMapping {
local_to_global: IndexVec<LocalFileId, u32>,
global_to_local: FxIndexMap<u32, LocalFileId>,
}
impl VirtualFileMapping {
fn local_id_for_global(&mut self, global_file_id: u32) -> LocalFileId {
*self
.global_to_local
.entry(global_file_id)
.or_insert_with(|| self.local_to_global.push(global_file_id))
}
fn into_vec(self) -> Vec<u32> {
self.local_to_global.raw
}
}
/// Using the expressions and counter regions collected for a single function,
/// generate the variable-sized payload of its corresponding `__llvm_covfun`
/// entry. The payload is returned as a vector of bytes.
///
/// Newly-encountered filenames will be added to the global file table.
fn encode_mappings_for_function(
global_file_table: &GlobalFileTable,
function_coverage: &FunctionCoverage<'_>,
) -> Vec<u8> {
let counter_regions = function_coverage.counter_regions();
if counter_regions.is_empty() {
return Vec::new();
}
let expressions = function_coverage.counter_expressions().collect::<Vec<_>>();
let mut virtual_file_mapping = VirtualFileMapping::default();
let mut mapping_regions = Vec::with_capacity(counter_regions.len());
// Group mappings into runs with the same filename, preserving the order
// yielded by `FunctionCoverage`.
// Prepare file IDs for each filename, and prepare the mapping data so that
// we can pass it through FFI to LLVM.
for (file_name, counter_regions_for_file) in
&counter_regions.group_by(|(_, region)| region.file_name)
{
// Look up the global file ID for this filename.
let global_file_id = global_file_table.global_file_id_for_file_name(file_name);
// Associate that global file ID with a local file ID for this function.
let local_file_id = virtual_file_mapping.local_id_for_global(global_file_id);
debug!(" file id: {local_file_id:?} => global {global_file_id} = '{file_name:?}'");
// For each counter/region pair in this function+file, convert it to a
// form suitable for FFI.
for (mapping_kind, region) in counter_regions_for_file {
debug!("Adding counter {mapping_kind:?} to map for {region:?}");
mapping_regions.push(CounterMappingRegion::from_mapping(
&mapping_kind,
local_file_id.as_u32(),
region,
));
}
}
// Encode the function's coverage mappings into a buffer.
llvm::build_byte_buffer(|buffer| {
coverageinfo::write_mapping_to_buffer(
virtual_file_mapping.into_vec(),
expressions,
mapping_regions,
buffer,
);
})
}
/// Construct coverage map header and the array of function records, and combine them into the
/// coverage map. Save the coverage map data into the LLVM IR as a static global using a
/// specific, well-known section and name.
fn generate_coverage_map<'ll>(
cx: &CodegenCx<'ll, '_>,
version: u32,
filenames_size: usize,
filenames_val: &'ll llvm::Value,
) -> &'ll llvm::Value {
debug!("cov map: filenames_size = {}, 0-based version = {}", filenames_size, version);
// Create the coverage data header (Note, fields 0 and 2 are now always zero,
// as of `llvm::coverage::CovMapVersion::Version4`.)
let zero_was_n_records_val = cx.const_u32(0);
let filenames_size_val = cx.const_u32(filenames_size as u32);
let zero_was_coverage_size_val = cx.const_u32(0);
let version_val = cx.const_u32(version);
let cov_data_header_val = cx.const_struct(
&[zero_was_n_records_val, filenames_size_val, zero_was_coverage_size_val, version_val],
/*packed=*/ false,
);
// Create the complete LLVM coverage data value to add to the LLVM IR
cx.const_struct(&[cov_data_header_val, filenames_val], /*packed=*/ false)
}
/// Construct a function record and combine it with the function's coverage mapping data.
/// Save the function record into the LLVM IR as a static global using a
/// specific, well-known section and name.
fn save_function_record(
cx: &CodegenCx<'_, '_>,
covfun_section_name: &str,
mangled_function_name: &str,
source_hash: u64,
filenames_ref: u64,
coverage_mapping_buffer: Vec<u8>,
is_used: bool,
) {
// Concatenate the encoded coverage mappings
let coverage_mapping_size = coverage_mapping_buffer.len();
let coverage_mapping_val = cx.const_bytes(&coverage_mapping_buffer);
let func_name_hash = coverageinfo::hash_bytes(mangled_function_name.as_bytes());
let func_name_hash_val = cx.const_u64(func_name_hash);
let coverage_mapping_size_val = cx.const_u32(coverage_mapping_size as u32);
let source_hash_val = cx.const_u64(source_hash);
let filenames_ref_val = cx.const_u64(filenames_ref);
let func_record_val = cx.const_struct(
&[
func_name_hash_val,
coverage_mapping_size_val,
source_hash_val,
filenames_ref_val,
coverage_mapping_val,
],
/*packed=*/ true,
);
coverageinfo::save_func_record_to_mod(
cx,
covfun_section_name,
func_name_hash,
func_record_val,
is_used,
);
}
/// When finalizing the coverage map, `FunctionCoverage` only has the `CodeRegion`s and counters for
/// the functions that went through codegen; such as public functions and "used" functions
/// (functions referenced by other "used" or public items). Any other functions considered unused,
/// or "Unreachable", were still parsed and processed through the MIR stage, but were not
/// codegenned. (Note that `-Clink-dead-code` can force some unused code to be codegenned, but
/// that flag is known to cause other errors, when combined with `-C instrument-coverage`; and
/// `-Clink-dead-code` will not generate code for unused generic functions.)
///
/// We can find the unused functions (including generic functions) by the set difference of all MIR
/// `DefId`s (`tcx` query `mir_keys`) minus the codegenned `DefId`s (`codegenned_and_inlined_items`).
///
/// These unused functions don't need to be codegenned, but we do need to add them to the function
/// coverage map (in a single designated CGU) so that we still emit coverage mappings for them.
/// We also end up adding their symbol names to a special global array that LLVM will include in
/// its embedded coverage data.
fn add_unused_functions(cx: &CodegenCx<'_, '_>) {
assert!(cx.codegen_unit.is_code_coverage_dead_code_cgu());
let tcx = cx.tcx;
let eligible_def_ids = tcx.mir_keys(()).iter().filter_map(|local_def_id| {
let def_id = local_def_id.to_def_id();
let kind = tcx.def_kind(def_id);
// `mir_keys` will give us `DefId`s for all kinds of things, not
// just "functions", like consts, statics, etc. Filter those out.
if !matches!(kind, DefKind::Fn | DefKind::AssocFn | DefKind::Closure) {
return None;
}
// FIXME(79651): Consider trying to filter out dummy instantiations of
// unused generic functions from library crates, because they can produce
// "unused instantiation" in coverage reports even when they are actually
// used by some downstream crate in the same binary.
Some(local_def_id.to_def_id())
});
let codegenned_def_ids = codegenned_and_inlined_items(tcx);
// For each `DefId` that should have coverage instrumentation but wasn't
// codegenned, add it to the function coverage map as an unused function.
for def_id in eligible_def_ids.filter(|id| !codegenned_def_ids.contains(id)) {
// Skip any function that didn't have coverage data added to it by the
// coverage instrumentor.
let body = tcx.instance_mir(ty::InstanceDef::Item(def_id));
let Some(function_coverage_info) = body.function_coverage_info.as_deref() else {
continue;
};
debug!("generating unused fn: {def_id:?}");
let instance = declare_unused_fn(tcx, def_id);
add_unused_function_coverage(cx, instance, function_coverage_info);
}
}
/// All items participating in code generation together with (instrumented)
/// items inlined into them.
fn codegenned_and_inlined_items(tcx: TyCtxt<'_>) -> DefIdSet {
let (items, cgus) = tcx.collect_and_partition_mono_items(());
let mut visited = DefIdSet::default();
let mut result = items.clone();
for cgu in cgus {
for item in cgu.items().keys() {
if let mir::mono::MonoItem::Fn(ref instance) = item {
let did = instance.def_id();
if !visited.insert(did) {
continue;
}
let body = tcx.instance_mir(instance.def);
for block in body.basic_blocks.iter() {
for statement in &block.statements {
let mir::StatementKind::Coverage(_) = statement.kind else { continue };
let scope = statement.source_info.scope;
if let Some(inlined) = scope.inlined_instance(&body.source_scopes) {
result.insert(inlined.def_id());
}
}
}
}
}
}
result
}
fn declare_unused_fn<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId) -> ty::Instance<'tcx> {
ty::Instance::new(
def_id,
ty::GenericArgs::for_item(tcx, def_id, |param, _| {
if let ty::GenericParamDefKind::Lifetime = param.kind {
tcx.lifetimes.re_erased.into()
} else {
tcx.mk_param_from_def(param)
}
}),
)
}
fn add_unused_function_coverage<'tcx>(
cx: &CodegenCx<'_, 'tcx>,
instance: ty::Instance<'tcx>,
function_coverage_info: &'tcx mir::coverage::FunctionCoverageInfo,
) {
// An unused function's mappings will automatically be rewritten to map to
// zero, because none of its counters/expressions are marked as seen.
let function_coverage = FunctionCoverageCollector::unused(instance, function_coverage_info);
if let Some(coverage_context) = cx.coverage_context() {
coverage_context.function_coverage_map.borrow_mut().insert(instance, function_coverage);
} else {
bug!("Could not get the `coverage_context`");
}
}