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Auto merge of #81114 - bugadani:generator, r=estebank

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Box generator-related Body fields

Might save some memory on functions that aren't generators.
This commit is contained in:
bors 2021-03-04 00:23:42 +00:00
commit 6f7673d077
14 changed files with 89 additions and 54 deletions
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2
compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
View File

@ -1417,7 +1417,7 @@ fn generator_layout_and_saved_local_names(
def_id: DefId,
) -> (&'tcx GeneratorLayout<'tcx>, IndexVec<mir::GeneratorSavedLocal, Option<Symbol>>) {
let body = tcx.optimized_mir(def_id);
let generator_layout = body.generator_layout.as_ref().unwrap();
let generator_layout = body.generator_layout().unwrap();
let mut generator_saved_local_names = IndexVec::from_elem(None, &generator_layout.field_tys);
let state_arg = mir::Local::new(1);

66
compiler/rustc_middle/src/mir/mod.rs
View File

@ -146,6 +146,22 @@ impl<'tcx> MirSource<'tcx> {
}
}
#[derive(Clone, TyEncodable, TyDecodable, Debug, HashStable, TypeFoldable)]
pub struct GeneratorInfo<'tcx> {
/// The yield type of the function, if it is a generator.
pub yield_ty: Option<Ty<'tcx>>,
/// Generator drop glue.
pub generator_drop: Option<Body<'tcx>>,
/// The layout of a generator. Produced by the state transformation.
pub generator_layout: Option<GeneratorLayout<'tcx>>,
/// If this is a generator then record the type of source expression that caused this generator
/// to be created.
pub generator_kind: GeneratorKind,
}
/// The lowered representation of a single function.
#[derive(Clone, TyEncodable, TyDecodable, Debug, HashStable, TypeFoldable)]
pub struct Body<'tcx> {
@ -166,18 +182,7 @@ pub struct Body<'tcx> {
/// and used for debuginfo. Indexed by a `SourceScope`.
pub source_scopes: IndexVec<SourceScope, SourceScopeData<'tcx>>,
/// The yield type of the function, if it is a generator.
pub yield_ty: Option<Ty<'tcx>>,
/// Generator drop glue.
pub generator_drop: Option<Box<Body<'tcx>>>,
/// The layout of a generator. Produced by the state transformation.
pub generator_layout: Option<GeneratorLayout<'tcx>>,
/// If this is a generator then record the type of source expression that caused this generator
/// to be created.
pub generator_kind: Option<GeneratorKind>,
pub generator: Option<Box<GeneratorInfo<'tcx>>>,
/// Declarations of locals.
///
@ -259,10 +264,14 @@ impl<'tcx> Body<'tcx> {
source,
basic_blocks,
source_scopes,
yield_ty: None,
generator_drop: None,
generator_layout: None,
generator_kind,
generator: generator_kind.map(|generator_kind| {
Box::new(GeneratorInfo {
yield_ty: None,
generator_drop: None,
generator_layout: None,
generator_kind,
})
}),
local_decls,
user_type_annotations,
arg_count,
@ -289,16 +298,13 @@ impl<'tcx> Body<'tcx> {
source: MirSource::item(DefId::local(CRATE_DEF_INDEX)),
basic_blocks,
source_scopes: IndexVec::new(),
yield_ty: None,
generator_drop: None,
generator_layout: None,
generator: None,
local_decls: IndexVec::new(),
user_type_annotations: IndexVec::new(),
arg_count: 0,
spread_arg: None,
span: DUMMY_SP,
required_consts: Vec::new(),
generator_kind: None,
var_debug_info: Vec::new(),
is_polymorphic: false,
predecessor_cache: PredecessorCache::new(),
@ -480,6 +486,26 @@ impl<'tcx> Body<'tcx> {
pub fn dominators(&self) -> Dominators<BasicBlock> {
dominators(self)
}
#[inline]
pub fn yield_ty(&self) -> Option<Ty<'tcx>> {
self.generator.as_ref().and_then(|generator| generator.yield_ty)
}
#[inline]
pub fn generator_layout(&self) -> Option<&GeneratorLayout<'tcx>> {
self.generator.as_ref().and_then(|generator| generator.generator_layout.as_ref())
}
#[inline]
pub fn generator_drop(&self) -> Option<&Body<'tcx>> {
self.generator.as_ref().and_then(|generator| generator.generator_drop.as_ref())
}
#[inline]
pub fn generator_kind(&self) -> Option<GeneratorKind> {
self.generator.as_ref().map(|generator| generator.generator_kind)
}
}
#[derive(Copy, Clone, PartialEq, Eq, Debug, TyEncodable, TyDecodable, HashStable)]

12
compiler/rustc_middle/src/mir/visit.rs
View File

@ -241,11 +241,13 @@ macro_rules! make_mir_visitor {
body: &$($mutability)? Body<'tcx>,
) {
let span = body.span;
if let Some(yield_ty) = &$($mutability)? body.yield_ty {
self.visit_ty(
yield_ty,
TyContext::YieldTy(SourceInfo::outermost(span))
);
if let Some(gen) = &$($mutability)? body.generator {
if let Some(yield_ty) = &$($mutability)? gen.yield_ty {
self.visit_ty(
yield_ty,
TyContext::YieldTy(SourceInfo::outermost(span))
);
}
}
// for best performance, we want to use an iterator rather

2
compiler/rustc_middle/src/ty/mod.rs
View File

@ -2998,7 +2998,7 @@ impl<'tcx> TyCtxt<'tcx> {
/// Returns layout of a generator. Layout might be unavailable if the
/// generator is tainted by errors.
pub fn generator_layout(self, def_id: DefId) -> Option<&'tcx GeneratorLayout<'tcx>> {
self.optimized_mir(def_id).generator_layout.as_ref()
self.optimized_mir(def_id).generator_layout()
}
/// Given the `DefId` of an impl, returns the `DefId` of the trait it implements.

7
compiler/rustc_mir/src/borrow_check/type_check/input_output.rs
View File

@ -103,11 +103,8 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
}
}
assert!(
body.yield_ty.is_some() && universal_regions.yield_ty.is_some()
|| body.yield_ty.is_none() && universal_regions.yield_ty.is_none()
);
if let Some(mir_yield_ty) = body.yield_ty {
assert!(body.yield_ty().is_some() == universal_regions.yield_ty.is_some());
if let Some(mir_yield_ty) = body.yield_ty() {
let ur_yield_ty = universal_regions.yield_ty.unwrap();
let yield_span = body.local_decls[RETURN_PLACE].source_info.span;
self.equate_normalized_input_or_output(ur_yield_ty, mir_yield_ty, yield_span);

2
compiler/rustc_mir/src/borrow_check/type_check/mod.rs
View File

@ -1651,7 +1651,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
}
TerminatorKind::Yield { ref value, .. } => {
let value_ty = value.ty(body, tcx);
match body.yield_ty {
match body.yield_ty() {
None => span_mirbug!(self, term, "yield in non-generator"),
Some(ty) => {
if let Err(terr) = self.sub_types(

2
compiler/rustc_mir/src/shim.rs
View File

@ -134,7 +134,7 @@ fn build_drop_shim<'tcx>(tcx: TyCtxt<'tcx>, def_id: DefId, ty: Option<Ty<'tcx>>)
// Check if this is a generator, if so, return the drop glue for it
if let Some(&ty::Generator(gen_def_id, substs, _)) = ty.map(|ty| ty.kind()) {
let body = &**tcx.optimized_mir(gen_def_id).generator_drop.as_ref().unwrap();
let body = tcx.optimized_mir(gen_def_id).generator_drop().unwrap();
return body.clone().subst(tcx, substs);
}

2
compiler/rustc_mir/src/transform/check_consts/validation.rs
View File

@ -222,7 +222,7 @@ impl Validator<'mir, 'tcx> {
// `async` functions cannot be `const fn`. This is checked during AST lowering, so there's
// no need to emit duplicate errors here.
if is_async_fn(self.ccx) || body.generator_kind.is_some() {
if is_async_fn(self.ccx) || body.generator.is_some() {
tcx.sess.delay_span_bug(body.span, "`async` functions cannot be `const fn`");
return;
}

2
compiler/rustc_mir/src/transform/const_prop.rs
View File

@ -140,7 +140,7 @@ impl<'tcx> MirPass<'tcx> for ConstProp {
body.arg_count,
Default::default(),
body.span,
body.generator_kind,
body.generator_kind(),
);
// FIXME(oli-obk, eddyb) Optimize locals (or even local paths) to hold

13
compiler/rustc_mir/src/transform/generator.rs
View File

@ -1111,7 +1111,7 @@ fn create_generator_resume_function<'tcx>(
cases.insert(0, (UNRESUMED, BasicBlock::new(0)));
// Panic when resumed on the returned or poisoned state
let generator_kind = body.generator_kind.unwrap();
let generator_kind = body.generator_kind().unwrap();
if can_unwind {
cases.insert(
@ -1236,14 +1236,14 @@ fn create_cases<'tcx>(
impl<'tcx> MirPass<'tcx> for StateTransform {
fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
let yield_ty = if let Some(yield_ty) = body.yield_ty {
let yield_ty = if let Some(yield_ty) = body.yield_ty() {
yield_ty
} else {
// This only applies to generators
return;
};
assert!(body.generator_drop.is_none());
assert!(body.generator_drop().is_none());
// The first argument is the generator type passed by value
let gen_ty = body.local_decls.raw[1].ty;
@ -1340,10 +1340,11 @@ impl<'tcx> MirPass<'tcx> for StateTransform {
transform.visit_body(body);
// Update our MIR struct to reflect the changes we've made
body.yield_ty = None;
body.arg_count = 2; // self, resume arg
body.spread_arg = None;
body.generator_layout = Some(layout);
body.generator.as_mut().unwrap().yield_ty = None;
body.generator.as_mut().unwrap().generator_layout = Some(layout);
// Insert `drop(generator_struct)` which is used to drop upvars for generators in
// the unresumed state.
@ -1362,7 +1363,7 @@ impl<'tcx> MirPass<'tcx> for StateTransform {
// Create a copy of our MIR and use it to create the drop shim for the generator
let drop_shim = create_generator_drop_shim(tcx, &transform, gen_ty, body, drop_clean);
body.generator_drop = Some(box drop_shim);
body.generator.as_mut().unwrap().generator_drop = Some(drop_shim);
// Create the Generator::resume function
create_generator_resume_function(tcx, transform, body, can_return);

2
compiler/rustc_mir/src/transform/inline.rs
View File

@ -220,7 +220,7 @@ impl Inliner<'tcx> {
// since their `optimized_mir` is used for layout computation, which can
// create a cycle, even when no attempt is made to inline the function
// in the other direction.
if caller_body.generator_kind.is_some() {
if caller_body.generator.is_some() {
return Err("local generator (query cycle avoidance)");
}

2
compiler/rustc_mir/src/transform/promote_consts.rs
View File

@ -1177,7 +1177,7 @@ pub fn promote_candidates<'tcx>(
0,
vec![],
body.span,
body.generator_kind,
body.generator_kind(),
);
let promoter = Promoter {

4
compiler/rustc_mir/src/util/pretty.rs
View File

@ -131,7 +131,7 @@ fn dump_matched_mir_node<'tcx, F>(
Some(promoted) => write!(file, "::{:?}`", promoted)?,
}
writeln!(file, " {} {}", disambiguator, pass_name)?;
if let Some(ref layout) = body.generator_layout {
if let Some(ref layout) = body.generator_layout() {
writeln!(file, "/* generator_layout = {:#?} */", layout)?;
}
writeln!(file)?;
@ -956,7 +956,7 @@ fn write_mir_sig(tcx: TyCtxt<'_>, body: &Body<'_>, w: &mut dyn Write) -> io::Res
write!(w, ": {} =", body.return_ty())?;
}
if let Some(yield_ty) = body.yield_ty {
if let Some(yield_ty) = body.yield_ty() {
writeln!(w)?;
writeln!(w, "yields {}", yield_ty)?;
}

25
compiler/rustc_mir_build/src/build/mod.rs
View File

@ -188,7 +188,9 @@ fn mir_build(tcx: TyCtxt<'_>, def: ty::WithOptConstParam<LocalDefId>) -> Body<'_
body,
span_with_body,
);
mir.yield_ty = yield_ty;
if yield_ty.is_some() {
mir.generator.as_mut().unwrap().yield_ty = yield_ty;
}
mir
} else {
// Get the revealed type of this const. This is *not* the adjusted
@ -218,7 +220,7 @@ fn mir_build(tcx: TyCtxt<'_>, def: ty::WithOptConstParam<LocalDefId>) -> Body<'_
!(body.local_decls.has_free_regions()
|| body.basic_blocks().has_free_regions()
|| body.var_debug_info.has_free_regions()
|| body.yield_ty.has_free_regions()),
|| body.yield_ty().has_free_regions()),
"Unexpected free regions in MIR: {:?}",
body,
);
@ -686,10 +688,11 @@ fn construct_error<'a, 'tcx>(hir: Cx<'a, 'tcx>, body_id: hir::BodyId) -> Body<'t
let def_id = tcx.hir().local_def_id(owner_id);
let span = tcx.hir().span(owner_id);
let ty = tcx.ty_error();
let generator_kind = tcx.hir().body(body_id).generator_kind;
let num_params = match hir.body_owner_kind {
hir::BodyOwnerKind::Fn => tcx.hir().fn_decl_by_hir_id(owner_id).unwrap().inputs.len(),
hir::BodyOwnerKind::Closure => {
if tcx.hir().body(body_id).generator_kind().is_some() {
if generator_kind.is_some() {
// Generators have an implicit `self` parameter *and* a possibly
// implicit resume parameter.
2
@ -701,8 +704,16 @@ fn construct_error<'a, 'tcx>(hir: Cx<'a, 'tcx>, body_id: hir::BodyId) -> Body<'t
hir::BodyOwnerKind::Const => 0,
hir::BodyOwnerKind::Static(_) => 0,
};
let mut builder =
Builder::new(hir, def_id.to_def_id(), span, num_params, Safety::Safe, ty, span, None);
let mut builder = Builder::new(
hir,
def_id.to_def_id(),
span,
num_params,
Safety::Safe,
ty,
span,
generator_kind,
);
let source_info = builder.source_info(span);
// Some MIR passes will expect the number of parameters to match the
// function declaration.
@ -711,9 +722,7 @@ fn construct_error<'a, 'tcx>(hir: Cx<'a, 'tcx>, body_id: hir::BodyId) -> Body<'t
}
builder.cfg.terminate(START_BLOCK, source_info, TerminatorKind::Unreachable);
let mut body = builder.finish();
if tcx.hir().body(body_id).generator_kind.is_some() {
body.yield_ty = Some(ty);
}
body.generator.as_mut().map(|gen| gen.yield_ty = Some(ty));
body
}