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|
//! This pass is only used for UNIT TESTS related to incremental
//! compilation. It tests whether a particular `.o` file will be re-used
//! from a previous compilation or whether it must be regenerated.
//!
//! The user adds annotations to the crate of the following form:
//!
//! ```
//! # #![feature(rustc_attrs)]
//! #![rustc_partition_reused(module="spike", cfg="rpass2")]
//! #![rustc_partition_codegened(module="spike-x", cfg="rpass2")]
//! ```
//!
//! The first indicates (in the cfg `rpass2`) that `spike.o` will be
//! reused, the second that `spike-x.o` will be recreated. If these
//! annotations are inaccurate, errors are reported.
//!
//! The reason that we use `cfg=...` and not `#[cfg_attr]` is so that
//! the HIR doesn't change as a result of the annotations, which might
//! perturb the reuse results.
//!
//! `#![rustc_expected_cgu_reuse(module="spike", cfg="rpass2", kind="post-lto")]
//! allows for doing a more fine-grained check to see if pre- or post-lto data
//! was re-used.
use rustc_ast as ast;
use rustc_data_structures::fx::FxHashSet;
use rustc_hir::def_id::LOCAL_CRATE;
use rustc_middle::mir::mono::CodegenUnitNameBuilder;
use rustc_middle::ty::TyCtxt;
use rustc_session::cgu_reuse_tracker::*;
use rustc_span::symbol::{sym, Symbol};
#[allow(missing_docs)]
pub fn assert_module_sources(tcx: TyCtxt<'_>) {
tcx.dep_graph.with_ignore(|| {
if tcx.sess.opts.incremental.is_none() {
return;
}
let available_cgus =
tcx.collect_and_partition_mono_items(()).1.iter().map(|cgu| cgu.name()).collect();
let ams = AssertModuleSource { tcx, available_cgus };
for attr in tcx.hir().attrs(rustc_hir::CRATE_HIR_ID) {
ams.check_attr(attr);
}
})
}
struct AssertModuleSource<'tcx> {
tcx: TyCtxt<'tcx>,
available_cgus: FxHashSet<Symbol>,
}
impl<'tcx> AssertModuleSource<'tcx> {
fn check_attr(&self, attr: &ast::Attribute) {
let (expected_reuse, comp_kind) = if attr.has_name(sym::rustc_partition_reused) {
(CguReuse::PreLto, ComparisonKind::AtLeast)
} else if attr.has_name(sym::rustc_partition_codegened) {
(CguReuse::No, ComparisonKind::Exact)
} else if attr.has_name(sym::rustc_expected_cgu_reuse) {
match self.field(attr, sym::kind) {
sym::no => (CguReuse::No, ComparisonKind::Exact),
sym::pre_dash_lto => (CguReuse::PreLto, ComparisonKind::Exact),
sym::post_dash_lto => (CguReuse::PostLto, ComparisonKind::Exact),
sym::any => (CguReuse::PreLto, ComparisonKind::AtLeast),
other => {
self.tcx.sess.span_fatal(
attr.span,
&format!("unknown cgu-reuse-kind `{}` specified", other),
);
}
}
} else {
return;
};
if !self.tcx.sess.opts.unstable_opts.query_dep_graph {
self.tcx.sess.span_fatal(
attr.span,
"found CGU-reuse attribute but `-Zquery-dep-graph` was not specified",
);
}
if !self.check_config(attr) {
debug!("check_attr: config does not match, ignoring attr");
return;
}
let user_path = self.field(attr, sym::module).to_string();
let crate_name = self.tcx.crate_name(LOCAL_CRATE).to_string();
if !user_path.starts_with(&crate_name) {
let msg = format!(
"Found malformed codegen unit name `{}`. \
Codegen units names must always start with the name of the \
crate (`{}` in this case).",
user_path, crate_name
);
self.tcx.sess.span_fatal(attr.span, &msg);
}
// Split of the "special suffix" if there is one.
let (user_path, cgu_special_suffix) = if let Some(index) = user_path.rfind('.') {
(&user_path[..index], Some(&user_path[index + 1..]))
} else {
(&user_path[..], None)
};
let mut iter = user_path.split('-');
// Remove the crate name
assert_eq!(iter.next().unwrap(), crate_name);
let cgu_path_components = iter.collect::<Vec<_>>();
let cgu_name_builder = &mut CodegenUnitNameBuilder::new(self.tcx);
let cgu_name =
cgu_name_builder.build_cgu_name(LOCAL_CRATE, cgu_path_components, cgu_special_suffix);
debug!("mapping '{}' to cgu name '{}'", self.field(attr, sym::module), cgu_name);
if !self.available_cgus.contains(&cgu_name) {
let mut cgu_names: Vec<&str> =
self.available_cgus.iter().map(|cgu| cgu.as_str()).collect();
cgu_names.sort();
self.tcx.sess.span_err(
attr.span,
&format!(
"no module named `{}` (mangled: {}). Available modules: {}",
user_path,
cgu_name,
cgu_names.join(", ")
),
);
}
self.tcx.sess.cgu_reuse_tracker.set_expectation(
cgu_name,
&user_path,
attr.span,
expected_reuse,
comp_kind,
);
}
fn field(&self, attr: &ast::Attribute, name: Symbol) -> Symbol {
for item in attr.meta_item_list().unwrap_or_else(Vec::new) {
if item.has_name(name) {
if let Some(value) = item.value_str() {
return value;
} else {
self.tcx.sess.span_fatal(
item.span(),
&format!("associated value expected for `{}`", name),
);
}
}
}
self.tcx.sess.span_fatal(attr.span, &format!("no field `{}`", name));
}
/// Scan for a `cfg="foo"` attribute and check whether we have a
/// cfg flag called `foo`.
fn check_config(&self, attr: &ast::Attribute) -> bool {
let config = &self.tcx.sess.parse_sess.config;
let value = self.field(attr, sym::cfg);
debug!("check_config(config={:?}, value={:?})", config, value);
if config.iter().any(|&(name, _)| name == value) {
debug!("check_config: matched");
return true;
}
debug!("check_config: no match found");
false
}
}
|
