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|
//! This module contains the functionality to convert from the wacky tcx data
//! structures into the THIR. The `builder` is generally ignorant of the tcx,
//! etc., and instead goes through the `Cx` for most of its work.
use crate::thir::pattern::pat_from_hir;
use crate::thir::util::UserAnnotatedTyHelpers;
use rustc_data_structures::steal::Steal;
use rustc_errors::ErrorGuaranteed;
use rustc_hir as hir;
use rustc_hir::def::DefKind;
use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_hir::lang_items::LangItem;
use rustc_hir::HirId;
use rustc_hir::Node;
use rustc_middle::middle::region;
use rustc_middle::thir::*;
use rustc_middle::ty::{self, RvalueScopes, TyCtxt};
use rustc_span::Span;
pub(crate) fn thir_body(
tcx: TyCtxt<'_>,
owner_def: ty::WithOptConstParam<LocalDefId>,
) -> Result<(&Steal<Thir<'_>>, ExprId), ErrorGuaranteed> {
let hir = tcx.hir();
let body = hir.body(hir.body_owned_by(owner_def.did));
let mut cx = Cx::new(tcx, owner_def);
if let Some(reported) = cx.typeck_results.tainted_by_errors {
return Err(reported);
}
let expr = cx.mirror_expr(&body.value);
let owner_id = hir.local_def_id_to_hir_id(owner_def.did);
if let Some(ref fn_decl) = hir.fn_decl_by_hir_id(owner_id) {
let closure_env_param = cx.closure_env_param(owner_def.did, owner_id);
let explicit_params = cx.explicit_params(owner_id, fn_decl, body);
cx.thir.params = closure_env_param.into_iter().chain(explicit_params).collect();
// The resume argument may be missing, in that case we need to provide it here.
// It will always be `()` in this case.
if tcx.def_kind(owner_def.did) == DefKind::Generator && body.params.is_empty() {
cx.thir.params.push(Param {
ty: tcx.mk_unit(),
pat: None,
ty_span: None,
self_kind: None,
hir_id: None,
});
}
}
Ok((tcx.alloc_steal_thir(cx.thir), expr))
}
pub(crate) fn thir_tree(tcx: TyCtxt<'_>, owner_def: ty::WithOptConstParam<LocalDefId>) -> String {
match thir_body(tcx, owner_def) {
Ok((thir, _)) => format!("{:#?}", thir.steal()),
Err(_) => "error".into(),
}
}
struct Cx<'tcx> {
tcx: TyCtxt<'tcx>,
thir: Thir<'tcx>,
param_env: ty::ParamEnv<'tcx>,
region_scope_tree: &'tcx region::ScopeTree,
typeck_results: &'tcx ty::TypeckResults<'tcx>,
rvalue_scopes: &'tcx RvalueScopes,
/// When applying adjustments to the expression
/// with the given `HirId`, use the given `Span`,
/// instead of the usual span. This is used to
/// assign the span of an overall method call
/// (e.g. `my_val.foo()`) to the adjustment expressions
/// for the receiver.
adjustment_span: Option<(HirId, Span)>,
/// False to indicate that adjustments should not be applied. Only used for `custom_mir`
apply_adjustments: bool,
/// The `DefId` of the owner of this body.
body_owner: DefId,
}
impl<'tcx> Cx<'tcx> {
fn new(tcx: TyCtxt<'tcx>, def: ty::WithOptConstParam<LocalDefId>) -> Cx<'tcx> {
let typeck_results = tcx.typeck_opt_const_arg(def);
let did = def.did;
let hir = tcx.hir();
Cx {
tcx,
thir: Thir::new(),
param_env: tcx.param_env(def.did),
region_scope_tree: tcx.region_scope_tree(def.did),
typeck_results,
rvalue_scopes: &typeck_results.rvalue_scopes,
body_owner: did.to_def_id(),
adjustment_span: None,
apply_adjustments: hir
.attrs(hir.local_def_id_to_hir_id(did))
.iter()
.all(|attr| attr.name_or_empty() != rustc_span::sym::custom_mir),
}
}
#[instrument(level = "debug", skip(self))]
fn pattern_from_hir(&mut self, p: &hir::Pat<'_>) -> Box<Pat<'tcx>> {
let p = match self.tcx.hir().get(p.hir_id) {
Node::Pat(p) => p,
node => bug!("pattern became {:?}", node),
};
pat_from_hir(self.tcx, self.param_env, self.typeck_results(), p)
}
fn closure_env_param(&self, owner_def: LocalDefId, owner_id: HirId) -> Option<Param<'tcx>> {
match self.tcx.def_kind(owner_def) {
DefKind::Closure => {
let closure_ty = self.typeck_results.node_type(owner_id);
let ty::Closure(closure_def_id, closure_substs) = *closure_ty.kind() else {
bug!("closure expr does not have closure type: {:?}", closure_ty);
};
let bound_vars = self.tcx.mk_bound_variable_kinds(std::iter::once(
ty::BoundVariableKind::Region(ty::BrEnv),
));
let br = ty::BoundRegion {
var: ty::BoundVar::from_usize(bound_vars.len() - 1),
kind: ty::BrEnv,
};
let env_region = ty::ReLateBound(ty::INNERMOST, br);
let closure_env_ty =
self.tcx.closure_env_ty(closure_def_id, closure_substs, env_region).unwrap();
let liberated_closure_env_ty = self.tcx.erase_late_bound_regions(
ty::Binder::bind_with_vars(closure_env_ty, bound_vars),
);
let env_param = Param {
ty: liberated_closure_env_ty,
pat: None,
ty_span: None,
self_kind: None,
hir_id: None,
};
Some(env_param)
}
DefKind::Generator => {
let gen_ty = self.typeck_results.node_type(owner_id);
let gen_param =
Param { ty: gen_ty, pat: None, ty_span: None, self_kind: None, hir_id: None };
Some(gen_param)
}
_ => None,
}
}
fn explicit_params<'a>(
&'a mut self,
owner_id: HirId,
fn_decl: &'tcx hir::FnDecl<'tcx>,
body: &'tcx hir::Body<'tcx>,
) -> impl Iterator<Item = Param<'tcx>> + 'a {
let fn_sig = self.typeck_results.liberated_fn_sigs()[owner_id];
body.params.iter().enumerate().map(move |(index, param)| {
let ty_span = fn_decl
.inputs
.get(index)
// Make sure that inferred closure args have no type span
.and_then(|ty| if param.pat.span != ty.span { Some(ty.span) } else { None });
let self_kind = if index == 0 && fn_decl.implicit_self.has_implicit_self() {
Some(fn_decl.implicit_self)
} else {
None
};
// C-variadic fns also have a `VaList` input that's not listed in `fn_sig`
// (as it's created inside the body itself, not passed in from outside).
let ty = if fn_decl.c_variadic && index == fn_decl.inputs.len() {
let va_list_did = self.tcx.require_lang_item(LangItem::VaList, Some(param.span));
self.tcx
.bound_type_of(va_list_did)
.subst(self.tcx, &[self.tcx.lifetimes.re_erased.into()])
} else {
fn_sig.inputs()[index]
};
let pat = self.pattern_from_hir(param.pat);
Param { pat: Some(pat), ty, ty_span, self_kind, hir_id: Some(param.hir_id) }
})
}
}
impl<'tcx> UserAnnotatedTyHelpers<'tcx> for Cx<'tcx> {
fn tcx(&self) -> TyCtxt<'tcx> {
self.tcx
}
fn typeck_results(&self) -> &ty::TypeckResults<'tcx> {
self.typeck_results
}
}
mod block;
mod expr;
|
