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Auto merge of rust-lang#92844 - matthiaskrgr:rollup-z5wb6yi, r=matthi…
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Rollup of 9 pull requests

Successful merges:

 - rust-lang#90001 (Make rlib metadata strip works with MIPSr6 architecture)
 - rust-lang#91687 (rustdoc: do not emit tuple variant fields if none are documented)
 - rust-lang#91938 (Add `std::error::Report` type)
 - rust-lang#92006 (Welcome opaque types into the fold)
 - rust-lang#92142 ([code coverage] Fix missing dead code in modules that are never called)
 - rust-lang#92277 (rustc_metadata: Stop passing `CrateMetadataRef` by reference (step 1))
 - rust-lang#92334 (rustdoc: Preserve rendering of macro_rules matchers when possible)
 - rust-lang#92807 (Update cargo)
 - rust-lang#92832 (Update RELEASES for 1.58.)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
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bors committed Jan 14, 2022
2 parents 22e491a + 1a95aa9 commit f312a5e
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82 changes: 70 additions & 12 deletions Cargo.lock
View file
Expand Up @@ -24,6 +24,17 @@ dependencies = [
"rustc-std-workspace-core",
]

[[package]]
name = "ahash"
version = "0.7.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "43bb833f0bf979d8475d38fbf09ed3b8a55e1885fe93ad3f93239fc6a4f17b98"
dependencies = [
"getrandom 0.2.0",
"once_cell",
"version_check",
]

[[package]]
name = "aho-corasick"
version = "0.7.18"
Expand Down Expand Up @@ -324,7 +335,7 @@ dependencies = [
"cargo-test-macro",
"cargo-test-support",
"cargo-util",
"clap",
"clap 3.0.6",
"crates-io",
"crossbeam-utils 0.8.3",
"curl",
Expand Down Expand Up @@ -604,13 +615,28 @@ dependencies = [
"ansi_term 0.12.1",
"atty",
"bitflags",
"strsim",
"textwrap",
"strsim 0.8.0",
"textwrap 0.11.0",
"unicode-width",
"vec_map",
"yaml-rust 0.3.5",
]

[[package]]
name = "clap"
version = "3.0.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1957aa4a5fb388f0a0a73ce7556c5b42025b874e5cdc2c670775e346e97adec0"
dependencies = [
"atty",
"bitflags",
"indexmap",
"os_str_bytes",
"strsim 0.10.0",
"termcolor",
"textwrap 0.14.2",
]

[[package]]
name = "clippy"
version = "0.1.59"
Expand Down Expand Up @@ -641,7 +667,7 @@ version = "0.0.1"
dependencies = [
"bytecount",
"cargo_metadata 0.14.0",
"clap",
"clap 2.34.0",
"indoc",
"itertools 0.10.1",
"opener",
Expand Down Expand Up @@ -1579,6 +1605,7 @@ version = "0.11.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "362385356d610bd1e5a408ddf8d022041774b683f345a1d2cfcb4f60f8ae2db5"
dependencies = [
"ahash",
"compiler_builtins",
"rustc-std-workspace-alloc",
"rustc-std-workspace-core",
Expand Down Expand Up @@ -1746,7 +1773,7 @@ name = "installer"
version = "0.0.0"
dependencies = [
"anyhow",
"clap",
"clap 2.34.0",
"flate2",
"lazy_static",
"num_cpus",
Expand Down Expand Up @@ -2191,7 +2218,7 @@ dependencies = [
"ammonia",
"anyhow",
"chrono",
"clap",
"clap 2.34.0",
"elasticlunr-rs",
"env_logger 0.7.1",
"handlebars",
Expand Down Expand Up @@ -2396,8 +2423,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "39f37e50073ccad23b6d09bcb5b263f4e76d3bb6038e4a3c08e52162ffa8abc2"
dependencies = [
"compiler_builtins",
"crc32fast",
"indexmap",
"memchr",
"rustc-std-workspace-alloc",
"rustc-std-workspace-core",
Expand All @@ -2415,6 +2440,18 @@ dependencies = [
"memchr",
]

[[package]]
name = "object"
version = "0.28.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7ce8b38d41f9f3618fc23f908faae61510f8d8ce2d99cbe910641e8f1971f084"
dependencies = [
"crc32fast",
"hashbrown",
"indexmap",
"memchr",
]

[[package]]
name = "odht"
version = "0.3.1"
Expand Down Expand Up @@ -2512,6 +2549,15 @@ dependencies = [
"winapi",
]

[[package]]
name = "os_str_bytes"
version = "6.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8e22443d1643a904602595ba1cd8f7d896afe56d26712531c5ff73a15b2fbf64"
dependencies = [
"memchr",
]

[[package]]
name = "output_vt100"
version = "0.1.2"
Expand Down Expand Up @@ -2916,7 +2962,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7fec2e85e7a30f8fd31b7cf288ad363b5e51fd2cb6f53b416b0cfaabd84e1ccb"
dependencies = [
"bitflags",
"clap",
"clap 2.34.0",
"derive_more",
"env_logger 0.7.1",
"humantime 2.0.1",
Expand Down Expand Up @@ -3271,7 +3317,7 @@ dependencies = [
name = "rustbook"
version = "0.1.0"
dependencies = [
"clap",
"clap 2.34.0",
"env_logger 0.7.1",
"mdbook",
]
Expand Down Expand Up @@ -3801,7 +3847,7 @@ dependencies = [
"itertools 0.9.0",
"jobserver",
"libc",
"object 0.26.2",
"object 0.28.1",
"pathdiff",
"regex",
"rustc_apfloat",
Expand Down Expand Up @@ -5133,13 +5179,19 @@ version = "0.8.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"

[[package]]
name = "strsim"
version = "0.10.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"

[[package]]
name = "structopt"
version = "0.3.25"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "40b9788f4202aa75c240ecc9c15c65185e6a39ccdeb0fd5d008b98825464c87c"
dependencies = [
"clap",
"clap 2.34.0",
"lazy_static",
"structopt-derive",
]
Expand Down Expand Up @@ -5310,6 +5362,12 @@ dependencies = [
"unicode-width",
]

[[package]]
name = "textwrap"
version = "0.14.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0066c8d12af8b5acd21e00547c3797fde4e8677254a7ee429176ccebbe93dd80"

[[package]]
name = "thiserror"
version = "1.0.30"
Expand Down
10 changes: 0 additions & 10 deletions RELEASES.md
View file
Expand Up @@ -43,7 +43,6 @@ Stabilized APIs
- [`Option::unwrap_unchecked`]
- [`Result::unwrap_unchecked`]
- [`Result::unwrap_err_unchecked`]
- [`NonZero{unsigned}::is_power_of_two`]
- [`File::options`]

These APIs are now usable in const contexts:
Expand All @@ -56,10 +55,6 @@ These APIs are now usable in const contexts:
- [`Duration::checked_mul`]
- [`Duration::saturating_mul`]
- [`Duration::checked_div`]
- [`MaybeUninit::as_ptr`]
- [`MaybeUninit::as_mut_ptr`]
- [`MaybeUninit::assume_init`]
- [`MaybeUninit::assume_init_ref`]

Cargo
-----
Expand Down Expand Up @@ -141,7 +136,6 @@ and related tools.
[`Option::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/option/enum.Option.html#method.unwrap_unchecked
[`Result::unwrap_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_unchecked
[`Result::unwrap_err_unchecked`]: https://doc.rust-lang.org/stable/std/result/enum.Result.html#method.unwrap_err_unchecked
[`NonZero{unsigned}::is_power_of_two`]: https://doc.rust-lang.org/stable/std/num/struct.NonZeroU8.html#method.is_power_of_two
[`File::options`]: https://doc.rust-lang.org/stable/std/fs/struct.File.html#method.options
[`unix::process::ExitStatusExt::core_dumped`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.core_dumped
[`unix::process::ExitStatusExt::stopped_signal`]: https://doc.rust-lang.org/stable/std/os/unix/process/trait.ExitStatusExt.html#tymethod.stopped_signal
Expand All @@ -165,10 +159,6 @@ and related tools.
[`Duration::div_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_f32
[`Duration::div_duration_f64`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_duration_f64
[`Duration::div_duration_f32`]: https://doc.rust-lang.org/stable/std/time/struct.Duration.html#method.div_duration_f32
[`MaybeUninit::as_ptr`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_ptr
[`MaybeUninit::as_mut_ptr`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.as_mut_ptr
[`MaybeUninit::assume_init`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init
[`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref

Version 1.57.0 (2021-12-02)
==========================
Expand Down
120 changes: 34 additions & 86 deletions compiler/rustc_codegen_llvm/src/coverageinfo/mapgen.rs
View file
Expand Up @@ -5,12 +5,13 @@ use crate::llvm;
use llvm::coverageinfo::CounterMappingRegion;
use rustc_codegen_ssa::coverageinfo::map::{Counter, CounterExpression};
use rustc_codegen_ssa::traits::{ConstMethods, CoverageInfoMethods};
use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexSet};
use rustc_hir::def_id::{DefId, DefIdSet};
use rustc_data_structures::fx::FxIndexSet;
use rustc_hir::def::DefKind;
use rustc_hir::def_id::DefIdSet;
use rustc_llvm::RustString;
use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
use rustc_middle::mir::coverage::CodeRegion;
use rustc_middle::ty::TyCtxt;
use rustc_span::Symbol;

use std::ffi::CString;

Expand Down Expand Up @@ -46,7 +47,7 @@ pub fn finalize<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>) {
// 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 !tcx.sess.instrument_coverage_except_unused_functions() {
if cx.codegen_unit.is_code_coverage_dead_code_cgu() {
add_unused_functions(cx);
}

Expand Down Expand Up @@ -271,26 +272,35 @@ fn save_function_record(
/// `DefId`s (`tcx` query `mir_keys`) minus the codegenned `DefId`s (`tcx` query
/// `codegened_and_inlined_items`).
///
/// *HOWEVER* the codegenned `DefId`s are partitioned across multiple `CodegenUnit`s (CGUs), and
/// this function is processing a `function_coverage_map` for the functions (`Instance`/`DefId`)
/// allocated to only one of those CGUs. We must NOT inject any unused functions's `CodeRegion`s
/// more than once, so we have to pick a CGUs `function_coverage_map` into which the unused
/// function will be inserted.
/// These unused functions are then codegen'd in one of the CGUs which is marked as the
/// "code coverage dead code cgu" during the partitioning process. This prevents us from generating
/// code regions for the same function more than once which can lead to linker errors regarding
/// duplicate symbols.
fn add_unused_functions<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>) {
let tcx = cx.tcx;
assert!(cx.codegen_unit.is_code_coverage_dead_code_cgu());

// FIXME(#79622): Can this solution be simplified and/or improved? Are there other sources
// of compiler state data that might help (or better sources that could be exposed, but
// aren't yet)?
let tcx = cx.tcx;

let ignore_unused_generics = tcx.sess.instrument_coverage_except_unused_generics();

let all_def_ids: DefIdSet = tcx
let eligible_def_ids: DefIdSet = tcx
.mir_keys(())
.iter()
.filter_map(|local_def_id| {
let def_id = local_def_id.to_def_id();
if ignore_unused_generics && tcx.generics_of(def_id).requires_monomorphization(tcx) {
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 `ignore_unused_generics` was specified, filter out any
// generic functions from consideration as well.
if !matches!(
kind,
DefKind::Fn | DefKind::AssocFn | DefKind::Closure | DefKind::Generator
) {
return None;
} else if ignore_unused_generics
&& tcx.generics_of(def_id).requires_monomorphization(tcx)
{
return None;
}
Some(local_def_id.to_def_id())
Expand All @@ -299,79 +309,17 @@ fn add_unused_functions<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>) {

let codegenned_def_ids = tcx.codegened_and_inlined_items(());

let mut unused_def_ids_by_file: FxHashMap<Symbol, Vec<DefId>> = FxHashMap::default();
for &non_codegenned_def_id in all_def_ids.difference(codegenned_def_ids) {
// Make sure the non-codegenned (unused) function has at least one MIR
// `Coverage` statement with a code region, and return its file name.
if let Some(non_codegenned_file_name) = tcx.covered_file_name(non_codegenned_def_id) {
let def_ids =
unused_def_ids_by_file.entry(*non_codegenned_file_name).or_insert_with(Vec::new);
def_ids.push(non_codegenned_def_id);
}
}
for &non_codegenned_def_id in eligible_def_ids.difference(codegenned_def_ids) {
let codegen_fn_attrs = tcx.codegen_fn_attrs(non_codegenned_def_id);

if unused_def_ids_by_file.is_empty() {
// There are no unused functions with file names to add (in any CGU)
return;
}

// Each `CodegenUnit` (CGU) has its own function_coverage_map, and generates a specific binary
// with its own coverage map.
//
// Each covered function `Instance` can be included in only one coverage map, produced from a
// specific function_coverage_map, from a specific CGU.
//
// Since unused functions did not generate code, they are not associated with any CGU yet.
//
// To avoid injecting the unused functions in multiple coverage maps (for multiple CGUs)
// determine which function_coverage_map has the responsibility for publishing unreachable
// coverage, based on file name: For each unused function, find the CGU that generates the
// first function (based on sorted `DefId`) from the same file.
//
// Add a new `FunctionCoverage` to the `function_coverage_map`, with unreachable code regions
// for each region in it's MIR.

// Convert the `HashSet` of `codegenned_def_ids` to a sortable vector, and sort them.
let mut sorted_codegenned_def_ids: Vec<DefId> = codegenned_def_ids.iter().copied().collect();
sorted_codegenned_def_ids.sort_unstable();

let mut first_covered_def_id_by_file: FxHashMap<Symbol, DefId> = FxHashMap::default();
for &def_id in sorted_codegenned_def_ids.iter() {
if let Some(covered_file_name) = tcx.covered_file_name(def_id) {
// Only add files known to have unused functions
if unused_def_ids_by_file.contains_key(covered_file_name) {
first_covered_def_id_by_file.entry(*covered_file_name).or_insert(def_id);
}
// If a function is marked `#[no_coverage]`, then skip generating a
// dead code stub for it.
if codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::NO_COVERAGE) {
debug!("skipping unused fn marked #[no_coverage]: {:?}", non_codegenned_def_id);
continue;
}
}

// Get the set of def_ids with coverage regions, known by *this* CoverageContext.
let cgu_covered_def_ids: DefIdSet = match cx.coverage_context() {
Some(ctx) => ctx
.function_coverage_map
.borrow()
.keys()
.map(|&instance| instance.def.def_id())
.collect(),
None => return,
};

let cgu_covered_files: FxHashSet<Symbol> = first_covered_def_id_by_file
.iter()
.filter_map(
|(&file_name, def_id)| {
if cgu_covered_def_ids.contains(def_id) { Some(file_name) } else { None }
},
)
.collect();

// For each file for which this CGU is responsible for adding unused function coverage,
// get the `def_id`s for each unused function (if any), define a synthetic function with a
// single LLVM coverage counter, and add the function's coverage `CodeRegion`s. to the
// function_coverage_map.
for covered_file_name in cgu_covered_files {
for def_id in unused_def_ids_by_file.remove(&covered_file_name).into_iter().flatten() {
cx.define_unused_fn(def_id);
}
debug!("generating unused fn: {:?}", non_codegenned_def_id);
cx.define_unused_fn(non_codegenned_def_id);
}
}

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