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Construct SourceMap at the same time as SessionGlobals.

Browse Source 
Currently `SourceMap` is constructed slightly later than
`SessionGlobals`, and inserted. This commit changes things so they are
done at the same time.

Benefits:
- `SessionGlobals::source_map` changes from
  `Lock<Option<Lrc<SourceMap>>>` to `Option<Lrc<SourceMap>>`. It's still
  optional, but mutability isn't required because it's initialized at
  construction.
- `set_source_map` is removed, simplifying `run_compiler`, which is
  good because that's a critical function and it's nice to make it
  simpler.

This requires moving things around a bit, so the necessary inputs are
available when `SessionGlobals` is created, in particular the `loader`
and `hash_kind`, which are no longer computed by `build_session`. These
inputs are captured by the new `SourceMapInputs` type, which is threaded
through various places.
This commit is contained in:
Nicholas Nethercote 2024-03-21 14:17:00 +11:00
parent ff2e4ed1f1
commit 62c32aeeab
10 changed files with 118 additions and 116 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
compiler/rustc_hir/src/tests.rs
View File

@ -14,7 +14,7 @@ fn def_path_hash_depends_on_crate_id() {
// the crate by changing the crate disambiguator (e.g. via bumping the
// crate's version number).
create_session_globals_then(Edition::Edition2024, || {
create_session_globals_then(Edition::Edition2024, None, || {
let id0 = StableCrateId::new(Symbol::intern("foo"), false, vec!["1".to_string()], "");
let id1 = StableCrateId::new(Symbol::intern("foo"), false, vec!["2".to_string()], "");

90
compiler/rustc_interface/src/interface.rs
View File

@ -21,7 +21,7 @@ use rustc_session::config::{self, Cfg, CheckCfg, ExpectedValues, Input, OutFileN
use rustc_session::filesearch::{self, sysroot_candidates};
use rustc_session::parse::ParseSess;
use rustc_session::{lint, CompilerIO, EarlyDiagCtxt, Session};
use rustc_span::source_map::FileLoader;
use rustc_span::source_map::{FileLoader, RealFileLoader, SourceMapInputs};
use rustc_span::symbol::sym;
use rustc_span::FileName;
use std::path::PathBuf;
@ -336,18 +336,23 @@ pub fn run_compiler<R: Send>(config: Config, f: impl FnOnce(&Compiler) -> R + Se
let early_dcx = EarlyDiagCtxt::new(config.opts.error_format);
early_dcx.initialize_checked_jobserver();
crate::callbacks::setup_callbacks();
let sysroot = filesearch::materialize_sysroot(config.opts.maybe_sysroot.clone());
let target = config::build_target_config(&early_dcx, &config.opts, &sysroot);
let file_loader = config.file_loader.unwrap_or_else(|| Box::new(RealFileLoader));
let path_mapping = config.opts.file_path_mapping();
let hash_kind = config.opts.unstable_opts.src_hash_algorithm(&target);
util::run_in_thread_pool_with_globals(
config.opts.edition,
config.opts.unstable_opts.threads,
SourceMapInputs { file_loader, path_mapping, hash_kind },
|current_gcx| {
crate::callbacks::setup_callbacks();
// The previous `early_dcx` can't be reused here because it doesn't
// impl `Send`. Creating a new one is fine.
let early_dcx = EarlyDiagCtxt::new(config.opts.error_format);
let sysroot = filesearch::materialize_sysroot(config.opts.maybe_sysroot.clone());
let target = config::build_target_config(&early_dcx, &config.opts, &sysroot);
let codegen_backend = match config.make_codegen_backend {
None => util::get_codegen_backend(
&early_dcx,
@ -372,9 +377,7 @@ pub fn run_compiler<R: Send>(config: Config, f: impl FnOnce(&Compiler) -> R + Se
config.opts.unstable_opts.translate_directionality_markers,
) {
Ok(bundle) => bundle,
Err(e) => {
early_dcx.early_fatal(format!("failed to load fluent bundle: {e}"));
}
Err(e) => early_dcx.early_fatal(format!("failed to load fluent bundle: {e}")),
};
let mut locale_resources = Vec::from(config.locale_resources);
@ -393,7 +396,6 @@ pub fn run_compiler<R: Send>(config: Config, f: impl FnOnce(&Compiler) -> R + Se
config.registry.clone(),
locale_resources,
config.lint_caps,
config.file_loader,
target,
sysroot,
util::rustc_version_str().unwrap_or("unknown"),
@ -440,45 +442,43 @@ pub fn run_compiler<R: Send>(config: Config, f: impl FnOnce(&Compiler) -> R + Se
current_gcx,
};
rustc_span::set_source_map(compiler.sess.psess.clone_source_map(), move || {
// There are two paths out of `f`.
// - Normal exit.
// - Panic, e.g. triggered by `abort_if_errors`.
//
// We must run `finish_diagnostics` in both cases.
let res = {
// If `f` panics, `finish_diagnostics` will run during
// unwinding because of the `defer`.
let mut guar = None;
let sess_abort_guard = defer(|| {
guar = compiler.sess.finish_diagnostics(&config.registry);
});
// There are two paths out of `f`.
// - Normal exit.
// - Panic, e.g. triggered by `abort_if_errors`.
//
// We must run `finish_diagnostics` in both cases.
let res = {
// If `f` panics, `finish_diagnostics` will run during
// unwinding because of the `defer`.
let mut guar = None;
let sess_abort_guard = defer(|| {
guar = compiler.sess.finish_diagnostics(&config.registry);
});
let res = f(&compiler);
let res = f(&compiler);
// If `f` doesn't panic, `finish_diagnostics` will run
// normally when `sess_abort_guard` is dropped.
drop(sess_abort_guard);
// If `f` doesn't panic, `finish_diagnostics` will run
// normally when `sess_abort_guard` is dropped.
drop(sess_abort_guard);
// If `finish_diagnostics` emits errors (e.g. stashed
// errors) we can't return an error directly, because the
// return type of this function is `R`, not `Result<R, E>`.
// But we need to communicate the errors' existence to the
// caller, otherwise the caller might mistakenly think that
// no errors occurred and return a zero exit code. So we
// abort (panic) instead, similar to if `f` had panicked.
if guar.is_some() {
compiler.sess.dcx().abort_if_errors();
}
res
};
let prof = compiler.sess.prof.clone();
prof.generic_activity("drop_compiler").run(move || drop(compiler));
// If `finish_diagnostics` emits errors (e.g. stashed
// errors) we can't return an error directly, because the
// return type of this function is `R`, not `Result<R, E>`.
// But we need to communicate the errors' existence to the
// caller, otherwise the caller might mistakenly think that
// no errors occurred and return a zero exit code. So we
// abort (panic) instead, similar to if `f` had panicked.
if guar.is_some() {
compiler.sess.dcx().abort_if_errors();
}
res
})
};
let prof = compiler.sess.prof.clone();
prof.generic_activity("drop_compiler").run(move || drop(compiler));
res
},
)
}

11
compiler/rustc_interface/src/tests.rs
View File

@ -16,6 +16,7 @@ use rustc_session::search_paths::SearchPath;
use rustc_session::utils::{CanonicalizedPath, NativeLib, NativeLibKind};
use rustc_session::{build_session, filesearch, getopts, CompilerIO, EarlyDiagCtxt, Session};
use rustc_span::edition::{Edition, DEFAULT_EDITION};
use rustc_span::source_map::{RealFileLoader, SourceMapInputs};
use rustc_span::symbol::sym;
use rustc_span::{FileName, SourceFileHashAlgorithm};
use rustc_target::spec::{CodeModel, LinkerFlavorCli, MergeFunctions, PanicStrategy, RelocModel};
@ -36,8 +37,14 @@ where
let sessopts = build_session_options(&mut early_dcx, &matches);
let sysroot = filesearch::materialize_sysroot(sessopts.maybe_sysroot.clone());
let target = rustc_session::config::build_target_config(&early_dcx, &sessopts, &sysroot);
let hash_kind = sessopts.unstable_opts.src_hash_algorithm(&target);
let sm_inputs = Some(SourceMapInputs {
file_loader: Box::new(RealFileLoader) as _,
path_mapping: sessopts.file_path_mapping(),
hash_kind,
});
rustc_span::create_default_session_globals_then(|| {
rustc_span::create_session_globals_then(DEFAULT_EDITION, sm_inputs, || {
let temps_dir = sessopts.unstable_opts.temps_dir.as_deref().map(PathBuf::from);
let io = CompilerIO {
input: Input::Str { name: FileName::Custom(String::new()), input: String::new() },
@ -45,6 +52,7 @@ where
output_file: None,
temps_dir,
};
let sess = build_session(
early_dcx,
sessopts,
@ -53,7 +61,6 @@ where
registry::Registry::new(&[]),
vec![],
Default::default(),
None,
target,
sysroot,
"",

16
compiler/rustc_interface/src/util.rs
View File

@ -14,6 +14,7 @@ use rustc_session::lint::{self, BuiltinLintDiag, LintBuffer};
use rustc_session::{filesearch, Session};
use rustc_span::edit_distance::find_best_match_for_name;
use rustc_span::edition::Edition;
use rustc_span::source_map::SourceMapInputs;
use rustc_span::symbol::sym;
use rustc_target::spec::Target;
use session::output::{categorize_crate_type, CRATE_TYPES};
@ -65,8 +66,9 @@ fn init_stack_size() -> usize {
})
}
pub(crate) fn run_in_thread_with_globals<F: FnOnce(CurrentGcx) -> R + Send, R: Send>(
fn run_in_thread_with_globals<F: FnOnce(CurrentGcx) -> R + Send, R: Send>(
edition: Edition,
sm_inputs: SourceMapInputs,
f: F,
) -> R {
// The "thread pool" is a single spawned thread in the non-parallel
@ -84,7 +86,9 @@ pub(crate) fn run_in_thread_with_globals<F: FnOnce(CurrentGcx) -> R + Send, R: S
// name contains null bytes.
let r = builder
.spawn_scoped(s, move || {
rustc_span::create_session_globals_then(edition, || f(CurrentGcx::new()))
rustc_span::create_session_globals_then(edition, Some(sm_inputs), || {
f(CurrentGcx::new())
})
})
.unwrap()
.join();
@ -100,15 +104,17 @@ pub(crate) fn run_in_thread_with_globals<F: FnOnce(CurrentGcx) -> R + Send, R: S
pub(crate) fn run_in_thread_pool_with_globals<F: FnOnce(CurrentGcx) -> R + Send, R: Send>(
edition: Edition,
_threads: usize,
sm_inputs: SourceMapInputs,
f: F,
) -> R {
run_in_thread_with_globals(edition, f)
run_in_thread_with_globals(edition, sm_inputs, f)
}
#[cfg(parallel_compiler)]
pub(crate) fn run_in_thread_pool_with_globals<F: FnOnce(CurrentGcx) -> R + Send, R: Send>(
edition: Edition,
threads: usize,
sm_inputs: SourceMapInputs,
f: F,
) -> R {
use rustc_data_structures::{defer, jobserver, sync::FromDyn};
@ -120,7 +126,7 @@ pub(crate) fn run_in_thread_pool_with_globals<F: FnOnce(CurrentGcx) -> R + Send,
let registry = sync::Registry::new(std::num::NonZero::new(threads).unwrap());
if !sync::is_dyn_thread_safe() {
return run_in_thread_with_globals(edition, |current_gcx| {
return run_in_thread_with_globals(edition, sm_inputs, |current_gcx| {
// Register the thread for use with the `WorkerLocal` type.
registry.register();
@ -169,7 +175,7 @@ pub(crate) fn run_in_thread_pool_with_globals<F: FnOnce(CurrentGcx) -> R + Send,
// pool. Upon creation, each worker thread created gets a copy of the
// session globals in TLS. This is possible because `SessionGlobals` impls
// `Send` in the parallel compiler.
rustc_span::create_session_globals_then(edition, || {
rustc_span::create_session_globals_then(edition, Some(sm_inputs), || {
rustc_span::with_session_globals(|session_globals| {
let session_globals = FromDyn::from(session_globals);
builder

2
compiler/rustc_log/src/lib.rs
View File

@ -17,7 +17,7 @@
//! rustc_log::init_logger(rustc_log::LoggerConfig::from_env("LOG")).unwrap();
//!
//! let edition = rustc_span::edition::Edition::Edition2021;
//! rustc_span::create_session_globals_then(edition, || {
//! rustc_span::create_session_globals_then(edition, None, || {
//! /* ... */
//! });
//! }

12
compiler/rustc_session/src/config.rs
View File

@ -1125,7 +1125,7 @@ impl Options {
|| self.unstable_opts.query_dep_graph
}
pub(crate) fn file_path_mapping(&self) -> FilePathMapping {
pub fn file_path_mapping(&self) -> FilePathMapping {
file_path_mapping(self.remap_path_prefix.clone(), &self.unstable_opts)
}
@ -1162,6 +1162,16 @@ impl UnstableOptions {
track_diagnostics: self.track_diagnostics,
}
}
pub fn src_hash_algorithm(&self, target: &Target) -> SourceFileHashAlgorithm {
self.src_hash_algorithm.unwrap_or_else(|| {
if target.is_like_msvc {
SourceFileHashAlgorithm::Sha256
} else {
SourceFileHashAlgorithm::Md5
}
})
}
}
// The type of entry function, so users can have their own entry functions

20
compiler/rustc_session/src/session.rs
View File

@ -28,9 +28,9 @@ use rustc_errors::{
use rustc_macros::HashStable_Generic;
pub use rustc_span::def_id::StableCrateId;
use rustc_span::edition::Edition;
use rustc_span::source_map::{FileLoader, FilePathMapping, RealFileLoader, SourceMap};
use rustc_span::source_map::{FilePathMapping, SourceMap};
use rustc_span::{FileNameDisplayPreference, RealFileName};
use rustc_span::{SourceFileHashAlgorithm, Span, Symbol};
use rustc_span::{Span, Symbol};
use rustc_target::asm::InlineAsmArch;
use rustc_target::spec::{CodeModel, PanicStrategy, RelocModel, RelroLevel};
use rustc_target::spec::{
@ -988,7 +988,6 @@ pub fn build_session(
registry: rustc_errors::registry::Registry,
fluent_resources: Vec<&'static str>,
driver_lint_caps: FxHashMap<lint::LintId, lint::Level>,
file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
target: Target,
sysroot: PathBuf,
cfg_version: &'static str,
@ -1015,24 +1014,11 @@ pub fn build_session(
early_dcx.early_warn(warning)
}
let loader = file_loader.unwrap_or_else(|| Box::new(RealFileLoader));
let hash_kind = sopts.unstable_opts.src_hash_algorithm.unwrap_or_else(|| {
if target.is_like_msvc {
SourceFileHashAlgorithm::Sha256
} else {
SourceFileHashAlgorithm::Md5
}
});
let source_map = Lrc::new(SourceMap::with_file_loader_and_hash_kind(
loader,
sopts.file_path_mapping(),
hash_kind,
));
let fallback_bundle = fallback_fluent_bundle(
fluent_resources,
sopts.unstable_opts.translate_directionality_markers,
);
let source_map = rustc_span::source_map::get_source_map().unwrap();
let emitter = default_emitter(&sopts, registry, source_map.clone(), bundle, fallback_bundle);
let mut dcx =

53
compiler/rustc_span/src/lib.rs
View File

@ -49,7 +49,7 @@ use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
mod caching_source_map_view;
pub mod source_map;
pub use self::caching_source_map_view::CachingSourceMapView;
use source_map::SourceMap;
use source_map::{SourceMap, SourceMapInputs};
pub mod edition;
use edition::Edition;
@ -104,35 +104,35 @@ pub struct SessionGlobals {
metavar_spans: Lock<FxHashMap<Span, Span>>,
hygiene_data: Lock<hygiene::HygieneData>,
/// A reference to the source map in the `Session`. It's an `Option`
/// because it can't be initialized until `Session` is created, which
/// happens after `SessionGlobals`. `set_source_map` does the
/// initialization.
///
/// This field should only be used in places where the `Session` is truly
/// not available, such as `<Span as Debug>::fmt`.
source_map: Lock<Option<Lrc<SourceMap>>>,
/// The session's source map, if there is one. This field should only be
/// used in places where the `Session` is truly not available, such as
/// `<Span as Debug>::fmt`.
source_map: Option<Lrc<SourceMap>>,
}
impl SessionGlobals {
pub fn new(edition: Edition) -> SessionGlobals {
pub fn new(edition: Edition, sm_inputs: Option<SourceMapInputs>) -> SessionGlobals {
SessionGlobals {
symbol_interner: symbol::Interner::fresh(),
span_interner: Lock::new(span_encoding::SpanInterner::default()),
metavar_spans: Default::default(),
hygiene_data: Lock::new(hygiene::HygieneData::new(edition)),
source_map: Lock::new(None),
source_map: sm_inputs.map(|inputs| Lrc::new(SourceMap::with_inputs(inputs))),
}
}
}
pub fn create_session_globals_then<R>(edition: Edition, f: impl FnOnce() -> R) -> R {
pub fn create_session_globals_then<R>(
edition: Edition,
sm_inputs: Option<SourceMapInputs>,
f: impl FnOnce() -> R,
) -> R {
assert!(
!SESSION_GLOBALS.is_set(),
"SESSION_GLOBALS should never be overwritten! \
Use another thread if you need another SessionGlobals"
);
let session_globals = SessionGlobals::new(edition);
let session_globals = SessionGlobals::new(edition, sm_inputs);
SESSION_GLOBALS.set(&session_globals, f)
}
@ -145,12 +145,13 @@ pub fn set_session_globals_then<R>(session_globals: &SessionGlobals, f: impl FnO
SESSION_GLOBALS.set(session_globals, f)
}
/// No source map.
pub fn create_session_if_not_set_then<R, F>(edition: Edition, f: F) -> R
where
F: FnOnce(&SessionGlobals) -> R,
{
if !SESSION_GLOBALS.is_set() {
let session_globals = SessionGlobals::new(edition);
let session_globals = SessionGlobals::new(edition, None);
SESSION_GLOBALS.set(&session_globals, || SESSION_GLOBALS.with(f))
} else {
SESSION_GLOBALS.with(f)
@ -164,8 +165,9 @@ where
SESSION_GLOBALS.with(f)
}
/// Default edition, no source map.
pub fn create_default_session_globals_then<R>(f: impl FnOnce() -> R) -> R {
create_session_globals_then(edition::DEFAULT_EDITION, f)
create_session_globals_then(edition::DEFAULT_EDITION, None, f)
}
// If this ever becomes non thread-local, `decode_syntax_context`
@ -1318,25 +1320,6 @@ impl<D: SpanDecoder> Decodable<D> for AttrId {
}
}
/// Insert `source_map` into the session globals for the duration of the
/// closure's execution.
pub fn set_source_map<T, F: FnOnce() -> T>(source_map: Lrc<SourceMap>, f: F) -> T {
with_session_globals(|session_globals| {
*session_globals.source_map.borrow_mut() = Some(source_map);
});
struct ClearSourceMap;
impl Drop for ClearSourceMap {
fn drop(&mut self) {
with_session_globals(|session_globals| {
session_globals.source_map.borrow_mut().take();
});
}
}
let _guard = ClearSourceMap;
f()
}
impl fmt::Debug for Span {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
// Use the global `SourceMap` to print the span. If that's not
@ -1352,7 +1335,7 @@ impl fmt::Debug for Span {
if SESSION_GLOBALS.is_set() {
with_session_globals(|session_globals| {
if let Some(source_map) = &*session_globals.source_map.borrow() {
if let Some(source_map) = &session_globals.source_map {
write!(f, "{} ({:?})", source_map.span_to_diagnostic_string(*self), self.ctxt())
} else {
fallback(*self, f)

26
compiler/rustc_span/src/source_map.rs
View File

@ -167,9 +167,17 @@ struct SourceMapFiles {
stable_id_to_source_file: UnhashMap<StableSourceFileId, Lrc<SourceFile>>,
}
/// Used to construct a `SourceMap` with `SourceMap::with_inputs`.
pub struct SourceMapInputs {
pub file_loader: Box<dyn FileLoader + Send + Sync>,
pub path_mapping: FilePathMapping,
pub hash_kind: SourceFileHashAlgorithm,
}
pub struct SourceMap {
files: RwLock<SourceMapFiles>,
file_loader: IntoDynSyncSend<Box<dyn FileLoader + Sync + Send>>,
// This is used to apply the file path remapping as specified via
// `--remap-path-prefix` to all `SourceFile`s allocated within this `SourceMap`.
path_mapping: FilePathMapping,
@ -180,17 +188,15 @@ pub struct SourceMap {
impl SourceMap {
pub fn new(path_mapping: FilePathMapping) -> SourceMap {
Self::with_file_loader_and_hash_kind(
Box::new(RealFileLoader),
Self::with_inputs(SourceMapInputs {
file_loader: Box::new(RealFileLoader),
path_mapping,
SourceFileHashAlgorithm::Md5,
)
hash_kind: SourceFileHashAlgorithm::Md5,
})
}
pub fn with_file_loader_and_hash_kind(
file_loader: Box<dyn FileLoader + Sync + Send>,
path_mapping: FilePathMapping,
hash_kind: SourceFileHashAlgorithm,
pub fn with_inputs(
SourceMapInputs { file_loader, path_mapping, hash_kind }: SourceMapInputs,
) -> SourceMap {
SourceMap {
files: Default::default(),
@ -1054,6 +1060,10 @@ impl SourceMap {
}
}
pub fn get_source_map() -> Option<Lrc<SourceMap>> {
with_session_globals(|session_globals| session_globals.source_map.clone())
}
#[derive(Clone)]
pub struct FilePathMapping {
mapping: Vec<(PathBuf, PathBuf)>,

2
src/tools/clippy/clippy_lints/src/doc/needless_doctest_main.rs
View File

@ -38,7 +38,7 @@ pub fn check(
// of all `#[test]` attributes in not ignored code examples
fn check_code_sample(code: String, edition: Edition, ignore: bool) -> (bool, Vec<Range<usize>>) {
rustc_driver::catch_fatal_errors(|| {
rustc_span::create_session_globals_then(edition, || {
rustc_span::create_session_globals_then(edition, None, || {
let mut test_attr_spans = vec![];
let filename = FileName::anon_source_code(&code);