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Auto merge of #82495 - LeSeulArtichaut:eager-thir, r=oli-obk

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Eagerly construct bodies of THIR

With this PR:
 - the THIR is no longer constructed lazily, but is entirely built before being passed to the MIR Builder
 - the THIR is now allocated in arenas instead of `Box`es

However, this PR doesn't make any changes to the way patterns are constructed: they are still boxed, and exhaustiveness checking is unchanged.

Implements MCP rust-lang/compiler-team#409.
Closes rust-lang/project-thir-unsafeck#1.
r? `@ghost` cc `@nikomatsakis` `@oli-obk`
This commit is contained in:
bors 2021-03-11 15:34:01 +00:00
commit 61365c0625
24 changed files with 1580 additions and 1770 deletions
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53
compiler/rustc_mir_build/src/build/block.rs
View File

@ -2,7 +2,6 @@ use crate::build::matches::ArmHasGuard;
use crate::build::ForGuard::OutsideGuard;
use crate::build::{BlockAnd, BlockAndExtension, BlockFrame, Builder};
use crate::thir::*;
use rustc_hir as hir;
use rustc_middle::mir::*;
use rustc_session::lint::builtin::UNSAFE_OP_IN_UNSAFE_FN;
use rustc_session::lint::Level;
@ -13,7 +12,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
&mut self,
destination: Place<'tcx>,
block: BasicBlock,
ast_block: &'tcx hir::Block<'tcx>,
ast_block: &Block<'_, 'tcx>,
source_info: SourceInfo,
) -> BlockAnd<()> {
let Block {
@ -24,7 +23,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
expr,
targeted_by_break,
safety_mode,
} = self.hir.mirror(ast_block);
} = *ast_block;
self.in_opt_scope(opt_destruction_scope.map(|de| (de, source_info)), move |this| {
this.in_scope((region_scope, source_info), LintLevel::Inherited, move |this| {
if targeted_by_break {
@ -50,8 +49,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
destination: Place<'tcx>,
mut block: BasicBlock,
span: Span,
stmts: Vec<StmtRef<'tcx>>,
expr: Option<ExprRef<'tcx>>,
stmts: &[Stmt<'_, 'tcx>],
expr: Option<&Expr<'_, 'tcx>>,
safety_mode: BlockSafety,
) -> BlockAnd<()> {
let this = self;
@ -79,10 +78,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
this.update_source_scope_for_safety_mode(span, safety_mode);
let source_info = this.source_info(span);
for stmt in stmts {
let Stmt { kind, opt_destruction_scope } = this.hir.mirror(stmt);
for Stmt { kind, opt_destruction_scope } in stmts {
match kind {
StmtKind::Expr { scope, expr } => {
&StmtKind::Expr { scope, expr } => {
this.block_context.push(BlockFrame::Statement { ignores_expr_result: true });
unpack!(
block = this.in_opt_scope(
@ -90,7 +88,6 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
|this| {
let si = (scope, source_info);
this.in_scope(si, LintLevel::Inherited, |this| {
let expr = this.hir.mirror(expr);
this.stmt_expr(block, expr, Some(scope))
})
}
@ -102,45 +99,44 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
this.block_context.push(BlockFrame::Statement { ignores_expr_result });
// Enter the remainder scope, i.e., the bindings' destruction scope.
this.push_scope((remainder_scope, source_info));
this.push_scope((*remainder_scope, source_info));
let_scope_stack.push(remainder_scope);
// Declare the bindings, which may create a source scope.
let remainder_span =
remainder_scope.span(this.hir.tcx(), &this.hir.region_scope_tree);
let remainder_span = remainder_scope.span(this.tcx, this.region_scope_tree);
let visibility_scope =
Some(this.new_source_scope(remainder_span, LintLevel::Inherited, None));
// Evaluate the initializer, if present.
if let Some(init) = initializer {
let initializer_span = init.span();
let initializer_span = init.span;
unpack!(
block = this.in_opt_scope(
opt_destruction_scope.map(|de| (de, source_info)),
|this| {
let scope = (init_scope, source_info);
this.in_scope(scope, lint_level, |this| {
let scope = (*init_scope, source_info);
this.in_scope(scope, *lint_level, |this| {
this.declare_bindings(
visibility_scope,
remainder_span,
&pattern,
pattern,
ArmHasGuard(false),
Some((None, initializer_span)),
);
this.expr_into_pattern(block, pattern, init)
this.expr_into_pattern(block, pattern.clone(), init)
})
}
)
);
} else {
let scope = (init_scope, source_info);
unpack!(this.in_scope(scope, lint_level, |this| {
let scope = (*init_scope, source_info);
unpack!(this.in_scope(scope, *lint_level, |this| {
this.declare_bindings(
visibility_scope,
remainder_span,
&pattern,
pattern,
ArmHasGuard(false),
None,
);
@ -171,18 +167,15 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// Then, the block may have an optional trailing expression which is a “return” value
// of the block, which is stored into `destination`.
let tcx = this.hir.tcx();
let tcx = this.tcx;
let destination_ty = destination.ty(&this.local_decls, tcx).ty;
if let Some(expr) = expr {
let tail_result_is_ignored =
destination_ty.is_unit() || this.block_context.currently_ignores_tail_results();
let span = match expr {
ExprRef::Thir(expr) => expr.span,
ExprRef::Mirror(ref expr) => expr.span,
};
this.block_context.push(BlockFrame::TailExpr { tail_result_is_ignored, span });
this.block_context
.push(BlockFrame::TailExpr { tail_result_is_ignored, span: expr.span });
unpack!(block = this.into(destination, block, expr));
unpack!(block = this.expr_into_dest(destination, block, expr));
let popped = this.block_context.pop();
assert!(popped.map_or(false, |bf| bf.is_tail_expr()));
@ -194,13 +187,13 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
if destination_ty.is_unit() {
// We only want to assign an implicit `()` as the return value of the block if the
// block does not diverge. (Otherwise, we may try to assign a unit to a `!`-type.)
this.cfg.push_assign_unit(block, source_info, destination, this.hir.tcx());
this.cfg.push_assign_unit(block, source_info, destination, this.tcx);
}
}
// Finally, we pop all the let scopes before exiting out from the scope of block
// itself.
for scope in let_scope_stack.into_iter().rev() {
unpack!(block = this.pop_scope((scope, source_info), block));
unpack!(block = this.pop_scope((*scope, source_info), block));
}
// Restore the original source scope.
this.source_scope = outer_source_scope;
@ -220,7 +213,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
Safety::Safe => {}
// no longer treat `unsafe fn`s as `unsafe` contexts (see RFC #2585)
Safety::FnUnsafe
if self.hir.tcx().lint_level_at_node(UNSAFE_OP_IN_UNSAFE_FN, hir_id).0
if self.tcx.lint_level_at_node(UNSAFE_OP_IN_UNSAFE_FN, hir_id).0
!= Level::Allow => {}
_ => return,
}

16
compiler/rustc_mir_build/src/build/expr/as_constant.rs
View File

@ -8,17 +8,9 @@ use rustc_middle::ty::CanonicalUserTypeAnnotation;
impl<'a, 'tcx> Builder<'a, 'tcx> {
/// Compile `expr`, yielding a compile-time constant. Assumes that
/// `expr` is a valid compile-time constant!
crate fn as_constant<M>(&mut self, expr: M) -> Constant<'tcx>
where
M: Mirror<'tcx, Output = Expr<'tcx>>,
{
let expr = self.hir.mirror(expr);
self.expr_as_constant(expr)
}
fn expr_as_constant(&mut self, expr: Expr<'tcx>) -> Constant<'tcx> {
crate fn as_constant(&mut self, expr: &Expr<'_, 'tcx>) -> Constant<'tcx> {
let this = self;
let Expr { ty, temp_lifetime: _, span, kind } = expr;
let Expr { ty, temp_lifetime: _, span, ref kind } = *expr;
match kind {
ExprKind::Scope { region_scope: _, lint_level: _, value } => this.as_constant(value),
ExprKind::Literal { literal, user_ty, const_id: _ } => {
@ -33,7 +25,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
Constant { span, user_ty, literal }
}
ExprKind::StaticRef { literal, .. } => Constant { span, user_ty: None, literal },
ExprKind::ConstBlock { value } => Constant { span, user_ty: None, literal: value },
ExprKind::ConstBlock { value } => {
Constant { span: span, user_ty: None, literal: value }
}
_ => span_bug!(span, "expression is not a valid constant {:?}", kind),
}
}

69
compiler/rustc_mir_build/src/build/expr/as_operand.rs
View File

@ -14,10 +14,11 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
/// after the current enclosing `ExprKind::Scope` has ended, so
/// please do *not* return it from functions to avoid bad
/// miscompiles.
crate fn as_local_operand<M>(&mut self, block: BasicBlock, expr: M) -> BlockAnd<Operand<'tcx>>
where
M: Mirror<'tcx, Output = Expr<'tcx>>,
{
crate fn as_local_operand(
&mut self,
block: BasicBlock,
expr: &Expr<'_, 'tcx>,
) -> BlockAnd<Operand<'tcx>> {
let local_scope = self.local_scope();
self.as_operand(block, Some(local_scope), expr)
}
@ -70,14 +71,11 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
/// value to the stack.
///
/// See #68034 for more details.
crate fn as_local_call_operand<M>(
crate fn as_local_call_operand(
&mut self,
block: BasicBlock,
expr: M,
) -> BlockAnd<Operand<'tcx>>
where
M: Mirror<'tcx, Output = Expr<'tcx>>,
{
expr: &Expr<'_, 'tcx>,
) -> BlockAnd<Operand<'tcx>> {
let local_scope = self.local_scope();
self.as_call_operand(block, Some(local_scope), expr)
}
@ -88,41 +86,16 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
/// this time.
///
/// The operand is known to be live until the end of `scope`.
crate fn as_operand<M>(
&mut self,
block: BasicBlock,
scope: Option<region::Scope>,
expr: M,
) -> BlockAnd<Operand<'tcx>>
where
M: Mirror<'tcx, Output = Expr<'tcx>>,
{
let expr = self.hir.mirror(expr);
self.expr_as_operand(block, scope, expr)
}
///
/// Like `as_local_call_operand`, except that the argument will
/// not be valid once `scope` ends.
fn as_call_operand<M>(
&mut self,
block: BasicBlock,
scope: Option<region::Scope>,
expr: M,
) -> BlockAnd<Operand<'tcx>>
where
M: Mirror<'tcx, Output = Expr<'tcx>>,
{
let expr = self.hir.mirror(expr);
self.expr_as_call_operand(block, scope, expr)
}
fn expr_as_operand(
crate fn as_operand(
&mut self,
mut block: BasicBlock,
scope: Option<region::Scope>,
expr: Expr<'tcx>,
expr: &Expr<'_, 'tcx>,
) -> BlockAnd<Operand<'tcx>> {
debug!("expr_as_operand(block={:?}, expr={:?})", block, expr);
debug!("as_operand(block={:?}, expr={:?})", block, expr);
let this = self;
if let ExprKind::Scope { region_scope, lint_level, value } = expr.kind {
@ -133,7 +106,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
}
let category = Category::of(&expr.kind).unwrap();
debug!("expr_as_operand: category={:?} for={:?}", category, expr.kind);
debug!("as_operand: category={:?} for={:?}", category, expr.kind);
match category {
Category::Constant => {
let constant = this.as_constant(expr);
@ -146,13 +119,13 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
}
}
fn expr_as_call_operand(
crate fn as_call_operand(
&mut self,
mut block: BasicBlock,
scope: Option<region::Scope>,
expr: Expr<'tcx>,
expr: &Expr<'_, 'tcx>,
) -> BlockAnd<Operand<'tcx>> {
debug!("expr_as_call_operand(block={:?}, expr={:?})", block, expr);
debug!("as_call_operand(block={:?}, expr={:?})", block, expr);
let this = self;
if let ExprKind::Scope { region_scope, lint_level, value } = expr.kind {
@ -163,12 +136,12 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
});
}
let tcx = this.hir.tcx();
let tcx = this.tcx;
if tcx.features().unsized_fn_params {
let ty = expr.ty;
let span = expr.span;
let param_env = this.hir.param_env;
let param_env = this.param_env;
if !ty.is_sized(tcx.at(span), param_env) {
// !sized means !copy, so this is an unsized move
@ -176,9 +149,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// As described above, detect the case where we are passing a value of unsized
// type, and that value is coming from the deref of a box.
if let ExprKind::Deref { ref arg } = expr.kind {
let arg = this.hir.mirror(arg.clone());
if let ExprKind::Deref { arg } = expr.kind {
// Generate let tmp0 = arg0
let operand = unpack!(block = this.as_temp(block, scope, arg, Mutability::Mut));
@ -193,6 +164,6 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
}
}
this.expr_as_operand(block, scope, expr)
this.as_operand(block, scope, expr)
}
}

78
compiler/rustc_mir_build/src/build/expr/as_place.rs
View File

@ -347,25 +347,22 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
/// Extra care is needed if any user code is allowed to run between calling
/// this method and using it, as is the case for `match` and index
/// expressions.
crate fn as_place<M>(&mut self, mut block: BasicBlock, expr: M) -> BlockAnd<Place<'tcx>>
where
M: Mirror<'tcx, Output = Expr<'tcx>>,
{
crate fn as_place(
&mut self,
mut block: BasicBlock,
expr: &Expr<'_, 'tcx>,
) -> BlockAnd<Place<'tcx>> {
let place_builder = unpack!(block = self.as_place_builder(block, expr));
block.and(place_builder.into_place(self.hir.tcx(), self.hir.typeck_results()))
block.and(place_builder.into_place(self.tcx, self.typeck_results))
}
/// This is used when constructing a compound `Place`, so that we can avoid creating
/// intermediate `Place` values until we know the full set of projections.
crate fn as_place_builder<M>(
crate fn as_place_builder(
&mut self,
block: BasicBlock,
expr: M,
) -> BlockAnd<PlaceBuilder<'tcx>>
where
M: Mirror<'tcx, Output = Expr<'tcx>>,
{
let expr = self.hir.mirror(expr);
expr: &Expr<'_, 'tcx>,
) -> BlockAnd<PlaceBuilder<'tcx>> {
self.expr_as_place(block, expr, Mutability::Mut, None)
}
@ -374,16 +371,13 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
/// place. The place itself may or may not be mutable:
/// * If this expr is a place expr like a.b, then we will return that place.
/// * Otherwise, a temporary is created: in that event, it will be an immutable temporary.
crate fn as_read_only_place<M>(
crate fn as_read_only_place(
&mut self,
mut block: BasicBlock,
expr: M,
) -> BlockAnd<Place<'tcx>>
where
M: Mirror<'tcx, Output = Expr<'tcx>>,
{
expr: &Expr<'_, 'tcx>,
) -> BlockAnd<Place<'tcx>> {
let place_builder = unpack!(block = self.as_read_only_place_builder(block, expr));
block.and(place_builder.into_place(self.hir.tcx(), self.hir.typeck_results()))
block.and(place_builder.into_place(self.tcx, self.typeck_results))
}
/// This is used when constructing a compound `Place`, so that we can avoid creating
@ -392,22 +386,18 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
/// place. The place itself may or may not be mutable:
/// * If this expr is a place expr like a.b, then we will return that place.
/// * Otherwise, a temporary is created: in that event, it will be an immutable temporary.
fn as_read_only_place_builder<M>(
fn as_read_only_place_builder(
&mut self,
block: BasicBlock,
expr: M,
) -> BlockAnd<PlaceBuilder<'tcx>>
where
M: Mirror<'tcx, Output = Expr<'tcx>>,
{
let expr = self.hir.mirror(expr);
expr: &Expr<'_, 'tcx>,
) -> BlockAnd<PlaceBuilder<'tcx>> {
self.expr_as_place(block, expr, Mutability::Not, None)
}
fn expr_as_place(
&mut self,
mut block: BasicBlock,
expr: Expr<'tcx>,
expr: &Expr<'_, 'tcx>,
mutability: Mutability,
fake_borrow_temps: Option<&mut Vec<Local>>,
) -> BlockAnd<PlaceBuilder<'tcx>> {
@ -419,18 +409,15 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
match expr.kind {
ExprKind::Scope { region_scope, lint_level, value } => {
this.in_scope((region_scope, source_info), lint_level, |this| {
let value = this.hir.mirror(value);
this.expr_as_place(block, value, mutability, fake_borrow_temps)
})
}
ExprKind::Field { lhs, name } => {
let lhs = this.hir.mirror(lhs);
let place_builder =
unpack!(block = this.expr_as_place(block, lhs, mutability, fake_borrow_temps,));
block.and(place_builder.field(name, expr.ty))
}
ExprKind::Deref { arg } => {
let arg = this.hir.mirror(arg);
let place_builder =
unpack!(block = this.expr_as_place(block, arg, mutability, fake_borrow_temps,));
block.and(place_builder.deref())
@ -462,7 +449,6 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
}
ExprKind::PlaceTypeAscription { source, user_ty } => {
let source = this.hir.mirror(source);
let place_builder = unpack!(
block = this.expr_as_place(block, source, mutability, fake_borrow_temps,)
);
@ -474,8 +460,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
inferred_ty: expr.ty,
});
let place =
place_builder.clone().into_place(this.hir.tcx(), this.hir.typeck_results());
let place = place_builder.clone().into_place(this.tcx, this.typeck_results);
this.cfg.push(
block,
Statement {
@ -493,7 +478,6 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
block.and(place_builder)
}
ExprKind::ValueTypeAscription { source, user_ty } => {
let source = this.hir.mirror(source);
let temp =
unpack!(block = this.as_temp(block, source.temp_lifetime, source, mutability));
if let Some(user_ty) = user_ty {
@ -570,12 +554,11 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
upvar_id: ty::UpvarId,
) -> BlockAnd<PlaceBuilder<'tcx>> {
let closure_ty = self
.hir
.typeck_results()
.node_type(self.hir.tcx().hir().local_def_id_to_hir_id(upvar_id.closure_expr_id));
.typeck_results
.node_type(self.tcx.hir().local_def_id_to_hir_id(upvar_id.closure_expr_id));
let closure_kind = if let ty::Closure(_, closure_substs) = closure_ty.kind() {
self.hir.infcx().closure_kind(closure_substs).unwrap()
self.infcx.closure_kind(closure_substs).unwrap()
} else {
// Generators are considered FnOnce.
ty::ClosureKind::FnOnce
@ -599,22 +582,20 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
fn lower_index_expression(
&mut self,
mut block: BasicBlock,
base: ExprRef<'tcx>,
index: ExprRef<'tcx>,
base: &Expr<'_, 'tcx>,
index: &Expr<'_, 'tcx>,
mutability: Mutability,
fake_borrow_temps: Option<&mut Vec<Local>>,
temp_lifetime: Option<region::Scope>,
expr_span: Span,
source_info: SourceInfo,
) -> BlockAnd<PlaceBuilder<'tcx>> {
let lhs = self.hir.mirror(base);
let base_fake_borrow_temps = &mut Vec::new();
let is_outermost_index = fake_borrow_temps.is_none();
let fake_borrow_temps = fake_borrow_temps.unwrap_or(base_fake_borrow_temps);
let mut base_place =
unpack!(block = self.expr_as_place(block, lhs, mutability, Some(fake_borrow_temps),));
unpack!(block = self.expr_as_place(block, base, mutability, Some(fake_borrow_temps),));
// Making this a *fresh* temporary means we do not have to worry about
// the index changing later: Nothing will ever change this temporary.
@ -623,7 +604,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
block = self.bounds_check(
block,
base_place.clone().into_place(self.hir.tcx(), self.hir.typeck_results()),
base_place.clone().into_place(self.tcx, self.typeck_results),
idx,
expr_span,
source_info,
@ -632,8 +613,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
if is_outermost_index {
self.read_fake_borrows(block, fake_borrow_temps, source_info)
} else {
base_place =
base_place.expect_upvars_resolved(self.hir.tcx(), self.hir.typeck_results());
base_place = base_place.expect_upvars_resolved(self.tcx, self.typeck_results);
self.add_fake_borrows_of_base(
&base_place,
block,
@ -654,8 +634,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
expr_span: Span,
source_info: SourceInfo,
) -> BasicBlock {
let usize_ty = self.hir.usize_ty();
let bool_ty = self.hir.bool_ty();
let usize_ty = self.tcx.types.usize;
let bool_ty = self.tcx.types.bool;
// bounds check:
let len = self.temp(usize_ty, expr_span);
let lt = self.temp(bool_ty, expr_span);
@ -685,7 +665,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
expr_span: Span,
source_info: SourceInfo,
) {
let tcx = self.hir.tcx();
let tcx = self.tcx;
let local = match base_place.base {
PlaceBase::Local(local) => local,
PlaceBase::Upvar { .. } => bug!("Expected PlacseBase::Local found Upvar"),

67
compiler/rustc_mir_build/src/build/expr/as_rvalue.rs
View File

@ -19,33 +19,21 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
/// The operand returned from this function will *not be valid* after
/// an ExprKind::Scope is passed, so please do *not* return it from
/// functions to avoid bad miscompiles.
crate fn as_local_rvalue<M>(&mut self, block: BasicBlock, expr: M) -> BlockAnd<Rvalue<'tcx>>
where
M: Mirror<'tcx, Output = Expr<'tcx>>,
{
crate fn as_local_rvalue(
&mut self,
block: BasicBlock,
expr: &Expr<'_, 'tcx>,
) -> BlockAnd<Rvalue<'tcx>> {
let local_scope = self.local_scope();
self.as_rvalue(block, Some(local_scope), expr)
}
/// Compile `expr`, yielding an rvalue.
fn as_rvalue<M>(
&mut self,
block: BasicBlock,
scope: Option<region::Scope>,
expr: M,
) -> BlockAnd<Rvalue<'tcx>>
where
M: Mirror<'tcx, Output = Expr<'tcx>>,
{
let expr = self.hir.mirror(expr);
self.expr_as_rvalue(block, scope, expr)
}
fn expr_as_rvalue(
crate fn as_rvalue(
&mut self,
mut block: BasicBlock,
scope: Option<region::Scope>,
expr: Expr<'tcx>,
expr: &Expr<'_, 'tcx>,
) -> BlockAnd<Rvalue<'tcx>> {
debug!("expr_as_rvalue(block={:?}, scope={:?}, expr={:?})", block, scope, expr);
@ -71,8 +59,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
ExprKind::Unary { op, arg } => {
let arg = unpack!(block = this.as_operand(block, scope, arg));
// Check for -MIN on signed integers
if this.hir.check_overflow() && op == UnOp::Neg && expr.ty.is_signed() {
let bool_ty = this.hir.bool_ty();
if this.check_overflow && op == UnOp::Neg && expr.ty.is_signed() {
let bool_ty = this.tcx.types.bool;
let minval = this.minval_literal(expr_span, expr.ty);
let is_min = this.temp(bool_ty, expr_span);
@ -95,7 +83,6 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
block.and(Rvalue::UnaryOp(op, arg))
}
ExprKind::Box { value } => {
let value = this.hir.mirror(value);
// The `Box<T>` temporary created here is not a part of the HIR,
// and therefore is not considered during generator auto-trait
// determination. See the comment about `box` at `yield_in_scope`.
@ -115,8 +102,11 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// initialize the box contents:
unpack!(
block =
this.into(this.hir.tcx().mk_place_deref(Place::from(result)), block, value)
block = this.expr_into_dest(
this.tcx.mk_place_deref(Place::from(result)),
block,
value
)
);
block.and(Rvalue::Use(Operand::Move(Place::from(result))))
}
@ -156,7 +146,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// to the same MIR as `let x = ();`.
// first process the set of fields
let el_ty = expr.ty.sequence_element_type(this.hir.tcx());
let el_ty = expr.ty.sequence_element_type(this.tcx);
let fields: Vec<_> = fields
.into_iter()
.map(|f| unpack!(block = this.as_operand(block, scope, f)))
@ -179,7 +169,6 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let operands: Vec<_> = upvars
.into_iter()
.map(|upvar| {
let upvar = this.hir.mirror(upvar);
match Category::of(&upvar.kind) {
// Use as_place to avoid creating a temporary when
// moving a variable into a closure, so that
@ -230,7 +219,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
block.and(Rvalue::Use(Operand::Constant(box Constant {
span: expr_span,
user_ty: None,
literal: ty::Const::zero_sized(this.hir.tcx(), this.hir.tcx().types.unit),
literal: ty::Const::zero_sized(this.tcx, this.tcx.types.unit),
})))
}
ExprKind::Yield { .. }
@ -282,9 +271,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
rhs: Operand<'tcx>,
) -> BlockAnd<Rvalue<'tcx>> {
let source_info = self.source_info(span);
let bool_ty = self.hir.bool_ty();
if self.hir.check_overflow() && op.is_checkable() && ty.is_integral() {
let result_tup = self.hir.tcx().intern_tup(&[ty, bool_ty]);
let bool_ty = self.tcx.types.bool;
if self.check_overflow && op.is_checkable() && ty.is_integral() {
let result_tup = self.tcx.intern_tup(&[ty, bool_ty]);
let result_value = self.temp(result_tup, span);
self.cfg.push_assign(
@ -296,7 +285,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let val_fld = Field::new(0);
let of_fld = Field::new(1);
let tcx = self.hir.tcx();
let tcx = self.tcx;
let val = tcx.mk_place_field(result_value, val_fld, ty);
let of = tcx.mk_place_field(result_value, of_fld, bool_ty);
@ -377,7 +366,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
upvar_ty: Ty<'tcx>,
temp_lifetime: Option<region::Scope>,
mut block: BasicBlock,
arg: ExprRef<'tcx>,
arg: &Expr<'_, 'tcx>,
) -> BlockAnd<Operand<'tcx>> {
let this = self;
@ -398,7 +387,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// is same as that of the capture in the parent closure.
PlaceBase::Upvar { .. } => {
let enclosing_upvars_resolved =
arg_place_builder.clone().into_place(this.hir.tcx(), this.hir.typeck_results());
arg_place_builder.clone().into_place(this.tcx, this.typeck_results);
match enclosing_upvars_resolved.as_ref() {
PlaceRef {
@ -435,13 +424,13 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
Mutability::Mut => BorrowKind::Mut { allow_two_phase_borrow: false },
};
let arg_place = arg_place_builder.into_place(this.hir.tcx(), this.hir.typeck_results());
let arg_place = arg_place_builder.into_place(this.tcx, this.typeck_results);
this.cfg.push_assign(
block,
source_info,
Place::from(temp),
Rvalue::Ref(this.hir.tcx().lifetimes.re_erased, borrow_kind, arg_place),
Rvalue::Ref(this.tcx.lifetimes.re_erased, borrow_kind, arg_place),
);
// See the comment in `expr_as_temp` and on the `rvalue_scopes` field for why
@ -456,9 +445,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// Helper to get a `-1` value of the appropriate type
fn neg_1_literal(&mut self, span: Span, ty: Ty<'tcx>) -> Operand<'tcx> {
let param_ty = ty::ParamEnv::empty().and(ty);
let bits = self.hir.tcx().layout_of(param_ty).unwrap().size.bits();
let bits = self.tcx.layout_of(param_ty).unwrap().size.bits();
let n = (!0u128) >> (128 - bits);
let literal = ty::Const::from_bits(self.hir.tcx(), n, param_ty);
let literal = ty::Const::from_bits(self.tcx, n, param_ty);
self.literal_operand(span, literal)
}
@ -467,9 +456,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
fn minval_literal(&mut self, span: Span, ty: Ty<'tcx>) -> Operand<'tcx> {
assert!(ty.is_signed());
let param_ty = ty::ParamEnv::empty().and(ty);
let bits = self.hir.tcx().layout_of(param_ty).unwrap().size.bits();
let bits = self.tcx.layout_of(param_ty).unwrap().size.bits();
let n = 1 << (bits - 1);
let literal = ty::Const::from_bits(self.hir.tcx(), n, param_ty);
let literal = ty::Const::from_bits(self.tcx, n, param_ty);
self.literal_operand(span, literal)
}

28
compiler/rustc_mir_build/src/build/expr/as_temp.rs
View File

@ -4,40 +4,34 @@ use crate::build::scope::DropKind;
use crate::build::{BlockAnd, BlockAndExtension, Builder};
use crate::thir::*;
use rustc_data_structures::stack::ensure_sufficient_stack;
use rustc_hir as hir;
use rustc_middle::middle::region;
use rustc_middle::mir::*;
impl<'a, 'tcx> Builder<'a, 'tcx> {
/// Compile `expr` into a fresh temporary. This is used when building
/// up rvalues so as to freeze the value that will be consumed.
crate fn as_temp<M>(
crate fn as_temp(
&mut self,
block: BasicBlock,
temp_lifetime: Option<region::Scope>,
expr: M,
expr: &Expr<'_, 'tcx>,
mutability: Mutability,
) -> BlockAnd<Local>
where
M: Mirror<'tcx, Output = Expr<'tcx>>,
{
let expr = self.hir.mirror(expr);
//
) -> BlockAnd<Local> {
// this is the only place in mir building that we need to truly need to worry about
// infinite recursion. Everything else does recurse, too, but it always gets broken up
// at some point by inserting an intermediate temporary
ensure_sufficient_stack(|| self.expr_as_temp(block, temp_lifetime, expr, mutability))
ensure_sufficient_stack(|| self.as_temp_inner(block, temp_lifetime, expr, mutability))
}
fn expr_as_temp(
fn as_temp_inner(
&mut self,
mut block: BasicBlock,
temp_lifetime: Option<region::Scope>,
expr: Expr<'tcx>,
expr: &Expr<'_, 'tcx>,
mutability: Mutability,
) -> BlockAnd<Local> {
debug!(
"expr_as_temp(block={:?}, temp_lifetime={:?}, expr={:?}, mutability={:?})",
"as_temp(block={:?}, temp_lifetime={:?}, expr={:?}, mutability={:?})",
block, temp_lifetime, expr, mutability
);
let this = self;
@ -65,13 +59,13 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
}
match expr.kind {
ExprKind::StaticRef { def_id, .. } => {
assert!(!this.hir.tcx().is_thread_local_static(def_id));
assert!(!this.tcx.is_thread_local_static(def_id));
local_decl.internal = true;
local_decl.local_info =
Some(box LocalInfo::StaticRef { def_id, is_thread_local: false });
}
ExprKind::ThreadLocalRef(def_id) => {
assert!(this.hir.tcx().is_thread_local_static(def_id));
assert!(this.tcx.is_thread_local_static(def_id));
local_decl.internal = true;
local_decl.local_info =
Some(box LocalInfo::StaticRef { def_id, is_thread_local: true });
@ -89,7 +83,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// Don't bother with StorageLive and Dead for these temporaries,
// they are never assigned.
ExprKind::Break { .. } | ExprKind::Continue { .. } | ExprKind::Return { .. } => (),
ExprKind::Block { body: hir::Block { expr: None, targeted_by_break: false, .. } }
ExprKind::Block { body: Block { expr: None, targeted_by_break: false, .. } }
if expr_ty.is_never() => {}
_ => {
this.cfg
@ -114,7 +108,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
}
}
unpack!(block = this.into(temp_place, block, expr));
unpack!(block = this.expr_into_dest(temp_place, block, expr));
if let Some(temp_lifetime) = temp_lifetime {
this.schedule_drop(expr_span, temp_lifetime, temp, DropKind::Value);

2
compiler/rustc_mir_build/src/build/expr/category.rs
View File

@ -31,7 +31,7 @@ crate enum RvalueFunc {
/// Determines the category for a given expression. Note that scope
/// and paren expressions have no category.
impl Category {
crate fn of(ek: &ExprKind<'_>) -> Option<Category> {
crate fn of(ek: &ExprKind<'_, '_>) -> Option<Category> {
match *ek {
ExprKind::Scope { .. } => None,

64
compiler/rustc_mir_build/src/build/expr/into.rs
View File

@ -7,19 +7,20 @@ use rustc_ast::InlineAsmOptions;
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::stack::ensure_sufficient_stack;
use rustc_hir as hir;
use rustc_index::vec::Idx;
use rustc_middle::mir::*;
use rustc_middle::ty::CanonicalUserTypeAnnotation;
use rustc_middle::ty::{self, CanonicalUserTypeAnnotation};
impl<'a, 'tcx> Builder<'a, 'tcx> {
/// Compile `expr`, storing the result into `destination`, which
/// is assumed to be uninitialized.
crate fn into_expr(
crate fn expr_into_dest(
&mut self,
destination: Place<'tcx>,
mut block: BasicBlock,
expr: Expr<'tcx>,
expr: &Expr<'_, 'tcx>,
) -> BlockAnd<()> {
debug!("into_expr(destination={:?}, block={:?}, expr={:?})", destination, block, expr);
debug!("expr_into_dest(destination={:?}, block={:?}, expr={:?})", destination, block, expr);
// since we frequently have to reference `self` from within a
// closure, where `self` would be shadowed, it's easier to
@ -40,11 +41,11 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let region_scope = (region_scope, source_info);
ensure_sufficient_stack(|| {
this.in_scope(region_scope, lint_level, |this| {
this.into(destination, block, value)
this.expr_into_dest(destination, block, value)
})
})
}
ExprKind::Block { body: ast_block } => {
ExprKind::Block { body: ref ast_block } => {
this.ast_block(destination, block, ast_block, source_info)
}
ExprKind::Match { scrutinee, arms } => {
@ -58,17 +59,17 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let mut then_block = this.cfg.start_new_block();
let mut else_block = this.cfg.start_new_block();
let term = TerminatorKind::if_(this.hir.tcx(), operand, then_block, else_block);
let term = TerminatorKind::if_(this.tcx, operand, then_block, else_block);
this.cfg.terminate(block, source_info, term);
unpack!(then_block = this.into(destination, then_block, then));
unpack!(then_block = this.expr_into_dest(destination, then_block, then));
else_block = if let Some(else_opt) = else_opt {
unpack!(this.into(destination, else_block, else_opt))
unpack!(this.expr_into_dest(destination, else_block, else_opt))
} else {
// Body of the `if` expression without an `else` clause must return `()`, thus
// we implicitly generate a `else {}` if it is not specified.
let correct_si = this.source_info(expr_span.shrink_to_hi());
this.cfg.push_assign_unit(else_block, correct_si, destination, this.hir.tcx());
this.cfg.push_assign_unit(else_block, correct_si, destination, this.tcx);
else_block
};
@ -87,7 +88,6 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
join_block.unit()
}
ExprKind::NeverToAny { source } => {
let source = this.hir.mirror(source);
let is_call =
matches!(source.kind, ExprKind::Call { .. } | ExprKind::InlineAsm { .. });
@ -132,25 +132,33 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
LogicalOp::And => (else_block, false_block),
LogicalOp::Or => (true_block, else_block),
};
let term = TerminatorKind::if_(this.hir.tcx(), lhs, blocks.0, blocks.1);
let term = TerminatorKind::if_(this.tcx, lhs, blocks.0, blocks.1);
this.cfg.terminate(block, source_info, term);
let rhs = unpack!(else_block = this.as_local_operand(else_block, rhs));
let term = TerminatorKind::if_(this.hir.tcx(), rhs, true_block, false_block);
let term = TerminatorKind::if_(this.tcx, rhs, true_block, false_block);
this.cfg.terminate(else_block, source_info, term);
this.cfg.push_assign_constant(
true_block,
source_info,
destination,
Constant { span: expr_span, user_ty: None, literal: this.hir.true_literal() },
Constant {
span: expr_span,
user_ty: None,
literal: ty::Const::from_bool(this.tcx, true),
},
);
this.cfg.push_assign_constant(
false_block,
source_info,
destination,
Constant { span: expr_span, user_ty: None, literal: this.hir.false_literal() },
Constant {
span: expr_span,
user_ty: None,
literal: ty::Const::from_bool(this.tcx, false),
},
);
// Link up both branches:
@ -188,7 +196,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// introduce a unit temporary as the destination for the loop body.
let tmp = this.get_unit_temp();
// Execute the body, branching back to the test.
let body_block_end = unpack!(this.into(tmp, body_block, body));
let body_block_end = unpack!(this.expr_into_dest(tmp, body_block, body));
this.cfg.goto(body_block_end, source_info, loop_block);
// Loops are only exited by `break` expressions.
@ -206,7 +214,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
this.record_operands_moved(&args);
debug!("into_expr: fn_span={:?}", fn_span);
debug!("expr_into_dest: fn_span={:?}", fn_span);
this.cfg.terminate(
block,
@ -230,7 +238,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
this.diverge_from(block);
success.unit()
}
ExprKind::Use { source } => this.into(destination, block, source),
ExprKind::Use { source } => this.expr_into_dest(destination, block, source),
ExprKind::Borrow { arg, borrow_kind } => {
// We don't do this in `as_rvalue` because we use `as_place`
// for borrow expressions, so we cannot create an `RValue` that
@ -241,8 +249,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
BorrowKind::Shared => unpack!(block = this.as_read_only_place(block, arg)),
_ => unpack!(block = this.as_place(block, arg)),
};
let borrow =
Rvalue::Ref(this.hir.tcx().lifetimes.re_erased, borrow_kind, arg_place);
let borrow = Rvalue::Ref(this.tcx.lifetimes.re_erased, borrow_kind, arg_place);
this.cfg.push_assign(block, source_info, destination, borrow);
block.unit()
}
@ -255,7 +262,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
this.cfg.push_assign(block, source_info, destination, address_of);
block.unit()
}
ExprKind::Adt { adt_def, variant_index, substs, user_ty, fields, base } => {
ExprKind::Adt { adt_def, variant_index, substs, user_ty, fields, ref base } => {
// See the notes for `ExprKind::Array` in `as_rvalue` and for
// `ExprKind::Borrow` above.
let is_union = adt_def.is_union();
@ -270,7 +277,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
.map(|f| (f.name, unpack!(block = this.as_operand(block, Some(scope), f.expr))))
.collect();
let field_names = this.hir.all_fields(adt_def, variant_index);
let field_names: Vec<_> =
(0..adt_def.variants[variant_index].fields.len()).map(Field::new).collect();
let fields: Vec<_> = if let Some(FruInfo { base, field_types }) = base {
let place_builder = unpack!(block = this.as_place_builder(block, base));
@ -288,7 +296,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
this.consume_by_copy_or_move(
place_builder
.field(n, ty)
.into_place(this.hir.tcx(), this.hir.typeck_results()),
.into_place(this.tcx, this.typeck_results),
)
}
})
@ -325,7 +333,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
use rustc_middle::mir;
let operands = operands
.into_iter()
.map(|op| match op {
.map(|op| match *op {
thir::InlineAsmOperand::In { reg, expr } => mir::InlineAsmOperand::In {
reg,
value: unpack!(block = this.as_local_operand(block, expr)),
@ -334,7 +342,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
mir::InlineAsmOperand::Out {
reg,
late,
place: expr.map(|expr| unpack!(block = this.as_place(block, expr))),
place: expr
.as_ref()
.map(|expr| unpack!(block = this.as_place(block, expr))),
}
}
thir::InlineAsmOperand::InOut { reg, late, expr } => {
@ -352,7 +362,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
reg,
late,
in_value: unpack!(block = this.as_local_operand(block, in_expr)),
out_place: out_expr.map(|out_expr| {
out_place: out_expr.as_ref().map(|out_expr| {
unpack!(block = this.as_place(block, out_expr))
}),
}
@ -394,7 +404,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
| ExprKind::AssignOp { .. }
| ExprKind::LlvmInlineAsm { .. } => {
unpack!(block = this.stmt_expr(block, expr, None));
this.cfg.push_assign_unit(block, source_info, destination, this.hir.tcx());
this.cfg.push_assign_unit(block, source_info, destination, this.tcx);
block.unit()
}

2
compiler/rustc_mir_build/src/build/expr/mod.rs
View File

@ -9,7 +9,7 @@
//! a type that is not `Copy`, then using any of these functions will
//! "move" the value out of its current home (if any).
//!
//! - `into` -- writes the value into a specific location, which
//! - `expr_into_dest` -- writes the value into a specific location, which
//! should be uninitialized
//! - `as_operand` -- evaluates the value and yields an `Operand`,
//! suitable for use as an argument to an `Rvalue`

46
compiler/rustc_mir_build/src/build/expr/stmt.rs
View File

@ -13,7 +13,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
crate fn stmt_expr(
&mut self,
mut block: BasicBlock,
expr: Expr<'tcx>,
expr: &Expr<'_, 'tcx>,
statement_scope: Option<region::Scope>,
) -> BlockAnd<()> {
let this = self;
@ -21,29 +21,25 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let source_info = this.source_info(expr.span);
// Handle a number of expressions that don't need a destination at all. This
// avoids needing a mountain of temporary `()` variables.
let expr2 = expr.clone();
match expr.kind {
ExprKind::Scope { region_scope, lint_level, value } => {
let value = this.hir.mirror(value);
this.in_scope((region_scope, source_info), lint_level, |this| {
this.stmt_expr(block, value, statement_scope)
})
}
ExprKind::Assign { lhs, rhs } => {
let lhs = this.hir.mirror(lhs);
let rhs = this.hir.mirror(rhs);
let lhs_span = lhs.span;
// Note: we evaluate assignments right-to-left. This
// is better for borrowck interaction with overloaded
// operators like x[j] = x[i].
debug!("stmt_expr Assign block_context.push(SubExpr) : {:?}", expr2);
debug!("stmt_expr Assign block_context.push(SubExpr) : {:?}", expr);
this.block_context.push(BlockFrame::SubExpr);
// Generate better code for things that don't need to be
// dropped.
if this.hir.needs_drop(lhs.ty) {
if lhs.ty.needs_drop(this.tcx, this.param_env) {
let rhs = unpack!(block = this.as_local_operand(block, rhs));
let lhs = unpack!(block = this.as_place(block, lhs));
unpack!(block = this.build_drop_and_replace(block, lhs_span, lhs, rhs));
@ -65,10 +61,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// only affects weird things like `x += {x += 1; x}`
// -- is that equal to `x + (x + 1)` or `2*(x+1)`?
let lhs = this.hir.mirror(lhs);
let lhs_ty = lhs.ty;
debug!("stmt_expr AssignOp block_context.push(SubExpr) : {:?}", expr2);
debug!("stmt_expr AssignOp block_context.push(SubExpr) : {:?}", expr);
this.block_context.push(BlockFrame::SubExpr);
// As above, RTL.
@ -90,24 +85,27 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
ExprKind::Continue { label } => {
this.break_scope(block, None, BreakableTarget::Continue(label), source_info)
}
ExprKind::Break { label, value } => {
this.break_scope(block, value, BreakableTarget::Break(label), source_info)
}
ExprKind::Break { label, value } => this.break_scope(
block,
value.as_deref(),
BreakableTarget::Break(label),
source_info,
),
ExprKind::Return { value } => {
this.break_scope(block, value, BreakableTarget::Return, source_info)
this.break_scope(block, value.as_deref(), BreakableTarget::Return, source_info)
}
ExprKind::LlvmInlineAsm { asm, outputs, inputs } => {
debug!("stmt_expr LlvmInlineAsm block_context.push(SubExpr) : {:?}", expr2);
debug!("stmt_expr LlvmInlineAsm block_context.push(SubExpr) : {:?}", expr);
this.block_context.push(BlockFrame::SubExpr);
let outputs = outputs
.into_iter()
.map(|output| unpack!(block = this.as_place(block, output)))
.map(|output| unpack!(block = this.as_place(block, &output)))
.collect::<Vec<_>>()
.into_boxed_slice();
let inputs = inputs
.into_iter()
.map(|input| {
(input.span(), unpack!(block = this.as_local_operand(block, input)))
(input.span, unpack!(block = this.as_local_operand(block, &input)))
})
.collect::<Vec<_>>()
.into_boxed_slice();
@ -140,15 +138,15 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// it is usually better to focus on `the_value` rather
// than the entirety of block(s) surrounding it.
let adjusted_span = (|| {
if let ExprKind::Block { body } = expr.kind {
if let ExprKind::Block { body } = &expr.kind {
if let Some(tail_expr) = &body.expr {
let mut expr = tail_expr;
while let rustc_hir::ExprKind::Block(subblock, _label) = &expr.kind {
if let Some(subtail_expr) = &subblock.expr {
expr = subtail_expr
} else {
break;
}
let mut expr = &*tail_expr;
while let ExprKind::Block {
body: Block { expr: Some(nested_expr), .. },
}
| ExprKind::Scope { value: nested_expr, .. } = &expr.kind
{
expr = nested_expr;
}
this.block_context.push(BlockFrame::TailExpr {
tail_result_is_ignored: true,

55
compiler/rustc_mir_build/src/build/into.rs
View File

@ -1,55 +0,0 @@
//! In general, there are a number of things for which it's convenient
//! to just call `builder.into` and have it emit its result into a
//! given location. This is basically for expressions or things that can be
//! wrapped up as expressions (e.g., blocks). To make this ergonomic, we use this
//! latter `EvalInto` trait.
use crate::build::{BlockAnd, Builder};
use crate::thir::*;
use rustc_middle::mir::*;
pub(in crate::build) trait EvalInto<'tcx> {
fn eval_into(
self,
builder: &mut Builder<'_, 'tcx>,
destination: Place<'tcx>,
block: BasicBlock,
) -> BlockAnd<()>;
}
impl<'a, 'tcx> Builder<'a, 'tcx> {
crate fn into<E>(
&mut self,
destination: Place<'tcx>,
block: BasicBlock,
expr: E,
) -> BlockAnd<()>
where
E: EvalInto<'tcx>,
{
expr.eval_into(self, destination, block)
}
}
impl<'tcx> EvalInto<'tcx> for ExprRef<'tcx> {
fn eval_into(
self,
builder: &mut Builder<'_, 'tcx>,
destination: Place<'tcx>,
block: BasicBlock,
) -> BlockAnd<()> {
let expr = builder.hir.mirror(self);
builder.into_expr(destination, block, expr)
}
}
impl<'tcx> EvalInto<'tcx> for Expr<'tcx> {
fn eval_into(
self,
builder: &mut Builder<'_, 'tcx>,
destination: Place<'tcx>,
block: BasicBlock,
) -> BlockAnd<()> {
builder.into_expr(destination, block, self)
}
}

59
compiler/rustc_mir_build/src/build/matches/mod.rs
View File

@ -89,10 +89,10 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
destination: Place<'tcx>,
span: Span,
mut block: BasicBlock,
scrutinee: ExprRef<'tcx>,
arms: Vec<Arm<'tcx>>,
scrutinee: &Expr<'_, 'tcx>,
arms: &[Arm<'_, 'tcx>],
) -> BlockAnd<()> {
let scrutinee_span = scrutinee.span();
let scrutinee_span = scrutinee.span;
let scrutinee_place =
unpack!(block = self.lower_scrutinee(block, scrutinee, scrutinee_span,));
@ -119,7 +119,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
fn lower_scrutinee(
&mut self,
mut block: BasicBlock,
scrutinee: ExprRef<'tcx>,
scrutinee: &Expr<'_, 'tcx>,
scrutinee_span: Span,
) -> BlockAnd<Place<'tcx>> {
let scrutinee_place = unpack!(block = self.as_place(block, scrutinee));
@ -149,8 +149,8 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
fn create_match_candidates<'pat>(
&mut self,
scrutinee: Place<'tcx>,
arms: &'pat [Arm<'tcx>],
) -> Vec<(&'pat Arm<'tcx>, Candidate<'pat, 'tcx>)> {
arms: &'pat [Arm<'pat, 'tcx>],
) -> Vec<(&'pat Arm<'pat, 'tcx>, Candidate<'pat, 'tcx>)> {
// Assemble a list of candidates: there is one candidate per pattern,
// which means there may be more than one candidate *per arm*.
arms.iter()
@ -224,7 +224,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
destination: Place<'tcx>,
scrutinee_place: Place<'tcx>,
scrutinee_span: Span,
arm_candidates: Vec<(&'_ Arm<'tcx>, Candidate<'_, 'tcx>)>,
arm_candidates: Vec<(&'_ Arm<'_, 'tcx>, Candidate<'_, 'tcx>)>,
outer_source_info: SourceInfo,
fake_borrow_temps: Vec<(Place<'tcx>, Local)>,
) -> BlockAnd<()> {
@ -236,7 +236,6 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let arm_source_info = self.source_info(arm.span);
let arm_scope = (arm.scope, arm_source_info);
self.in_scope(arm_scope, arm.lint_level, |this| {
let body = this.hir.mirror(arm.body.clone());
let scope = this.declare_bindings(
None,
arm.span,
@ -259,7 +258,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
this.source_scope = source_scope;
}
this.into(destination, arm_block, body)
this.expr_into_dest(destination, arm_block, &arm.body)
})
})
.collect();
@ -286,7 +285,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
&mut self,
outer_source_info: SourceInfo,
candidate: Candidate<'_, 'tcx>,
guard: Option<&Guard<'tcx>>,
guard: Option<&Guard<'_, 'tcx>>,
fake_borrow_temps: &Vec<(Place<'tcx>, Local)>,
scrutinee_span: Span,
arm_span: Option<Span>,
@ -362,14 +361,14 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
&mut self,
mut block: BasicBlock,
irrefutable_pat: Pat<'tcx>,
initializer: ExprRef<'tcx>,
initializer: &Expr<'_, 'tcx>,
) -> BlockAnd<()> {
match *irrefutable_pat.kind {
// Optimize the case of `let x = ...` to write directly into `x`
PatKind::Binding { mode: BindingMode::ByValue, var, subpattern: None, .. } => {
let place =
self.storage_live_binding(block, var, irrefutable_pat.span, OutsideGuard, true);
unpack!(block = self.into(place, block, initializer));
unpack!(block = self.expr_into_dest(place, block, initializer));
// Inject a fake read, see comments on `FakeReadCause::ForLet`.
let source_info = self.source_info(irrefutable_pat.span);
@ -404,7 +403,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
} => {
let place =
self.storage_live_binding(block, var, irrefutable_pat.span, OutsideGuard, true);
unpack!(block = self.into(place, block, initializer));
unpack!(block = self.expr_into_dest(place, block, initializer));
// Inject a fake read, see comments on `FakeReadCause::ForLet`.
let pattern_source_info = self.source_info(irrefutable_pat.span);
@ -414,7 +413,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let ty_source_info = self.source_info(user_ty_span);
let user_ty = pat_ascription_ty.user_ty(
&mut self.canonical_user_type_annotations,
place.ty(&self.local_decls, self.hir.tcx()).ty,
place.ty(&self.local_decls, self.tcx).ty,
ty_source_info.span,
);
self.cfg.push(
@ -556,7 +555,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let local_id = self.var_local_id(var, for_guard);
let source_info = self.source_info(span);
self.cfg.push(block, Statement { source_info, kind: StatementKind::StorageLive(local_id) });
let region_scope = self.hir.region_scope_tree.var_scope(var.local_id);
let region_scope = self.region_scope_tree.var_scope(var.local_id);
if schedule_drop {
self.schedule_drop(span, region_scope, local_id, DropKind::Storage);
}
@ -565,7 +564,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
crate fn schedule_drop_for_binding(&mut self, var: HirId, span: Span, for_guard: ForGuard) {
let local_id = self.var_local_id(var, for_guard);
let region_scope = self.hir.region_scope_tree.var_scope(var.local_id);
let region_scope = self.region_scope_tree.var_scope(var.local_id);
self.schedule_drop(span, region_scope, local_id, DropKind::Value);
}
@ -1071,7 +1070,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
fake_borrows.insert(Place {
local: source.local,
projection: self.hir.tcx().intern_place_elems(proj_base),
projection: self.tcx.intern_place_elems(proj_base),
});
}
}
@ -1550,7 +1549,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
fake_borrows: &'b FxHashSet<Place<'tcx>>,
temp_span: Span,
) -> Vec<(Place<'tcx>, Local)> {
let tcx = self.hir.tcx();
let tcx = self.tcx;
debug!("add_fake_borrows fake_borrows = {:?}", fake_borrows);
@ -1613,7 +1612,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
&mut self,
candidate: Candidate<'pat, 'tcx>,
parent_bindings: &[(Vec<Binding<'tcx>>, Vec<Ascription<'tcx>>)],
guard: Option<&Guard<'tcx>>,
guard: Option<&Guard<'_, 'tcx>>,
fake_borrows: &Vec<(Place<'tcx>, Local)>,
scrutinee_span: Span,
arm_span: Option<Span>,
@ -1727,7 +1726,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// * So we eagerly create the reference for the arm and then take a
// reference to that.
if let Some(guard) = guard {
let tcx = self.hir.tcx();
let tcx = self.tcx;
let bindings = parent_bindings
.iter()
.flat_map(|(bindings, _)| bindings)
@ -1749,15 +1748,13 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let (guard_span, (post_guard_block, otherwise_post_guard_block)) = match guard {
Guard::If(e) => {
let e = self.hir.mirror(e.clone());
let source_info = self.source_info(e.span);
(e.span, self.test_bool(block, e, source_info))
}
Guard::IfLet(pat, scrutinee) => {
let scrutinee_span = scrutinee.span();
let scrutinee_place = unpack!(
block = self.lower_scrutinee(block, scrutinee.clone(), scrutinee_span)
);
let scrutinee_span = scrutinee.span;
let scrutinee_place =
unpack!(block = self.lower_scrutinee(block, scrutinee, scrutinee_span));
let mut guard_candidate = Candidate::new(scrutinee_place, &pat, false);
let wildcard = Pat::wildcard_from_ty(pat.ty);
let mut otherwise_candidate = Candidate::new(scrutinee_place, &wildcard, false);
@ -1772,14 +1769,14 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
pat.span.to(arm_span.unwrap()),
pat,
ArmHasGuard(false),
Some((Some(&scrutinee_place), scrutinee.span())),
Some((Some(&scrutinee_place), scrutinee.span)),
);
let post_guard_block = self.bind_pattern(
self.source_info(pat.span),
guard_candidate,
None,
&fake_borrow_temps,
scrutinee.span(),
scrutinee.span,
None,
None,
);
@ -1888,7 +1885,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let user_ty = ascription.user_ty.clone().user_ty(
&mut self.canonical_user_type_annotations,
ascription.source.ty(&self.local_decls, self.hir.tcx()).ty,
ascription.source.ty(&self.local_decls, self.tcx).ty,
source_info.span,
);
self.cfg.push(
@ -1917,7 +1914,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// Assign each of the bindings. Since we are binding for a
// guard expression, this will never trigger moves out of the
// candidate.
let re_erased = self.hir.tcx().lifetimes.re_erased;
let re_erased = self.tcx.lifetimes.re_erased;
for binding in bindings {
debug!("bind_matched_candidate_for_guard(binding={:?})", binding);
let source_info = self.source_info(binding.span);
@ -1966,7 +1963,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
{
debug!("bind_matched_candidate_for_arm_body(block={:?})", block);
let re_erased = self.hir.tcx().lifetimes.re_erased;
let re_erased = self.tcx.lifetimes.re_erased;
// Assign each of the bindings. This may trigger moves out of the candidate.
for binding in bindings {
let source_info = self.source_info(binding.span);
@ -2015,7 +2012,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
var_id, name, mode, var_ty, visibility_scope, source_info
);
let tcx = self.hir.tcx();
let tcx = self.tcx;
let debug_source_info = SourceInfo { span: source_info.span, scope: visibility_scope };
let binding_mode = match mode {
BindingMode::ByValue => ty::BindingMode::BindByValue(mutability),

8
compiler/rustc_mir_build/src/build/matches/simplify.rs
View File

@ -147,7 +147,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
match_pair: MatchPair<'pat, 'tcx>,
candidate: &mut Candidate<'pat, 'tcx>,
) -> Result<(), MatchPair<'pat, 'tcx>> {
let tcx = self.hir.tcx();
let tcx = self.tcx;
match *match_pair.pattern.kind {
PatKind::AscribeUserType {
ref subpattern,
@ -251,13 +251,13 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
PatKind::Variant { adt_def, substs, variant_index, ref subpatterns } => {
let irrefutable = adt_def.variants.iter_enumerated().all(|(i, v)| {
i == variant_index || {
self.hir.tcx().features().exhaustive_patterns
self.tcx.features().exhaustive_patterns
&& !v
.uninhabited_from(
self.hir.tcx(),
self.tcx,
substs,
adt_def.adt_kind(),
self.hir.param_env,
self.param_env,
)
.is_empty()
}

75
compiler/rustc_mir_build/src/build/matches/test.rs
View File

@ -13,9 +13,11 @@ use rustc_data_structures::fx::FxIndexMap;
use rustc_hir::{LangItem, RangeEnd};
use rustc_index::bit_set::BitSet;
use rustc_middle::mir::*;
use rustc_middle::ty::subst::{GenericArg, Subst};
use rustc_middle::ty::util::IntTypeExt;
use rustc_middle::ty::{self, adjustment::PointerCast, Ty};
use rustc_span::symbol::sym;
use rustc_middle::ty::{self, adjustment::PointerCast, Ty, TyCtxt};
use rustc_span::def_id::DefId;
use rustc_span::symbol::{sym, Symbol};
use rustc_target::abi::VariantIdx;
use std::cmp::Ordering;
@ -93,9 +95,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
match *match_pair.pattern.kind {
PatKind::Constant { value } => {
options.entry(value).or_insert_with(|| {
value.eval_bits(self.hir.tcx(), self.hir.param_env, switch_ty)
});
options
.entry(value)
.or_insert_with(|| value.eval_bits(self.tcx, self.param_env, switch_ty));
true
}
PatKind::Variant { .. } => {
@ -157,7 +159,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
"perform_test({:?}, {:?}: {:?}, {:?})",
block,
place,
place.ty(&self.local_decls, self.hir.tcx()),
place.ty(&self.local_decls, self.tcx),
test
);
@ -169,7 +171,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let num_enum_variants = adt_def.variants.len();
debug_assert_eq!(target_blocks.len(), num_enum_variants + 1);
let otherwise_block = *target_blocks.last().unwrap();
let tcx = self.hir.tcx();
let tcx = self.tcx;
let switch_targets = SwitchTargets::new(
adt_def.discriminants(tcx).filter_map(|(idx, discr)| {
if variants.contains(idx) {
@ -217,7 +219,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
0 => (second_bb, first_bb),
v => span_bug!(test.span, "expected boolean value but got {:?}", v),
};
TerminatorKind::if_(self.hir.tcx(), Operand::Copy(place), true_bb, false_bb)
TerminatorKind::if_(self.tcx, Operand::Copy(place), true_bb, false_bb)
} else {
bug!("`TestKind::SwitchInt` on `bool` should have two targets")
}
@ -292,7 +294,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
TestKind::Len { len, op } => {
let target_blocks = make_target_blocks(self);
let usize_ty = self.hir.usize_ty();
let usize_ty = self.tcx.types.usize;
let actual = self.temp(usize_ty, test.span);
// actual = len(place)
@ -331,7 +333,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
left: Operand<'tcx>,
right: Operand<'tcx>,
) {
let bool_ty = self.hir.bool_ty();
let bool_ty = self.tcx.types.bool;
let result = self.temp(bool_ty, source_info.span);
// result = op(left, right)
@ -341,7 +343,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
self.cfg.terminate(
block,
source_info,
TerminatorKind::if_(self.hir.tcx(), Operand::Move(result), success_block, fail_block),
TerminatorKind::if_(self.tcx, Operand::Move(result), success_block, fail_block),
);
}
@ -377,7 +379,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// nothing to do, neither is an array
(None, None) => {}
(Some((region, elem_ty, _)), _) | (None, Some((region, elem_ty, _))) => {
let tcx = self.hir.tcx();
let tcx = self.tcx;
// make both a slice
ty = tcx.mk_imm_ref(region, tcx.mk_slice(elem_ty));
if opt_ref_ty.is_some() {
@ -408,10 +410,10 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
_ => bug!("non_scalar_compare called on non-reference type: {}", ty),
};
let eq_def_id = self.hir.tcx().require_lang_item(LangItem::PartialEq, None);
let method = self.hir.trait_method(eq_def_id, sym::eq, deref_ty, &[deref_ty.into()]);
let eq_def_id = self.tcx.require_lang_item(LangItem::PartialEq, None);
let method = trait_method(self.tcx, eq_def_id, sym::eq, deref_ty, &[deref_ty.into()]);
let bool_ty = self.hir.bool_ty();
let bool_ty = self.tcx.types.bool;
let eq_result = self.temp(bool_ty, source_info.span);
let eq_block = self.cfg.start_new_block();
self.cfg.terminate(
@ -443,12 +445,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
self.cfg.terminate(
eq_block,
source_info,
TerminatorKind::if_(
self.hir.tcx(),
Operand::Move(eq_result),
success_block,
fail_block,
),
TerminatorKind::if_(self.tcx, Operand::Move(eq_result), success_block, fail_block),
);
} else {
bug!("`TestKind::Eq` should have two target blocks")
@ -632,11 +629,11 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
use rustc_hir::RangeEnd::*;
use std::cmp::Ordering::*;
let tcx = self.hir.tcx();
let tcx = self.tcx;
let test_ty = test.lo.ty;
let lo = compare_const_vals(tcx, test.lo, pat.hi, self.hir.param_env, test_ty)?;
let hi = compare_const_vals(tcx, test.hi, pat.lo, self.hir.param_env, test_ty)?;
let lo = compare_const_vals(tcx, test.lo, pat.hi, self.param_env, test_ty)?;
let hi = compare_const_vals(tcx, test.hi, pat.lo, self.param_env, test_ty)?;
match (test.end, pat.end, lo, hi) {
// pat < test
@ -731,7 +728,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
candidate: &mut Candidate<'pat, 'tcx>,
) {
let match_pair = candidate.match_pairs.remove(match_pair_index);
let tcx = self.hir.tcx();
let tcx = self.tcx;
// So, if we have a match-pattern like `x @ Enum::Variant(P1, P2)`,
// we want to create a set of derived match-patterns like
@ -762,10 +759,10 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
) -> Option<bool> {
use std::cmp::Ordering::*;
let tcx = self.hir.tcx();
let tcx = self.tcx;
let a = compare_const_vals(tcx, range.lo, value, self.hir.param_env, range.lo.ty)?;
let b = compare_const_vals(tcx, value, range.hi, self.hir.param_env, range.lo.ty)?;
let a = compare_const_vals(tcx, range.lo, value, self.param_env, range.lo.ty)?;
let b = compare_const_vals(tcx, value, range.hi, self.param_env, range.lo.ty)?;
match (b, range.end) {
(Less, _) | (Equal, RangeEnd::Included) if a != Greater => Some(true),
@ -815,3 +812,25 @@ impl Test<'_> {
fn is_switch_ty(ty: Ty<'_>) -> bool {
ty.is_integral() || ty.is_char() || ty.is_bool()
}
fn trait_method<'tcx>(
tcx: TyCtxt<'tcx>,
trait_def_id: DefId,
method_name: Symbol,
self_ty: Ty<'tcx>,
params: &[GenericArg<'tcx>],
) -> &'tcx ty::Const<'tcx> {
let substs = tcx.mk_substs_trait(self_ty, params);
// The unhygienic comparison here is acceptable because this is only
// used on known traits.
let item = tcx
.associated_items(trait_def_id)
.filter_by_name_unhygienic(method_name)
.find(|item| item.kind == ty::AssocKind::Fn)
.expect("trait method not found");
let method_ty = tcx.type_of(item.def_id);
let method_ty = method_ty.subst(tcx, substs);
ty::Const::zero_sized(tcx, method_ty)
}

7
compiler/rustc_mir_build/src/build/matches/util.rs
View File

@ -15,8 +15,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
subpatterns
.iter()
.map(|fieldpat| {
let place =
self.hir.tcx().mk_place_field(place, fieldpat.field, fieldpat.pattern.ty);
let place = self.tcx.mk_place_field(place, fieldpat.field, fieldpat.pattern.ty);
MatchPair::new(place, &fieldpat.pattern)
})
.collect()
@ -30,9 +29,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
opt_slice: Option<&'pat Pat<'tcx>>,
suffix: &'pat [Pat<'tcx>],
) {
let tcx = self.hir.tcx();
let tcx = self.tcx;
let (min_length, exact_size) = match place.ty(&self.local_decls, tcx).ty.kind() {
ty::Array(_, length) => (length.eval_usize(tcx, self.hir.param_env), true),
ty::Array(_, length) => (length.eval_usize(tcx, self.param_env), true),
_ => ((prefix.len() + suffix.len()).try_into().unwrap(), false),
};

14
compiler/rustc_mir_build/src/build/misc.rs
View File

@ -3,10 +3,10 @@
use crate::build::Builder;
use rustc_middle::ty::{self, Ty};
use rustc_middle::mir::*;
use rustc_middle::ty::{self, Ty};
use rustc_span::{Span, DUMMY_SP};
use rustc_trait_selection::infer::InferCtxtExt;
impl<'a, 'tcx> Builder<'a, 'tcx> {
/// Adds a new temporary value of type `ty` storing the result of
@ -37,7 +37,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// Returns a zero literal operand for the appropriate type, works for
// bool, char and integers.
crate fn zero_literal(&mut self, span: Span, ty: Ty<'tcx>) -> Operand<'tcx> {
let literal = ty::Const::from_bits(self.hir.tcx(), 0, ty::ParamEnv::empty().and(ty));
let literal = ty::Const::from_bits(self.tcx, 0, ty::ParamEnv::empty().and(ty));
self.literal_operand(span, literal)
}
@ -48,7 +48,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
source_info: SourceInfo,
value: u64,
) -> Place<'tcx> {
let usize_ty = self.hir.usize_ty();
let usize_ty = self.tcx.types.usize;
let temp = self.temp(usize_ty, source_info.span);
self.cfg.push_assign_constant(
block,
@ -57,16 +57,16 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
Constant {
span: source_info.span,
user_ty: None,
literal: self.hir.usize_literal(value),
literal: ty::Const::from_usize(self.tcx, value),
},
);
temp
}
crate fn consume_by_copy_or_move(&self, place: Place<'tcx>) -> Operand<'tcx> {
let tcx = self.hir.tcx();
let tcx = self.tcx;
let ty = place.ty(&self.local_decls, tcx).ty;
if !self.hir.type_is_copy_modulo_regions(ty, DUMMY_SP) {
if !self.infcx.type_is_copy_modulo_regions(self.param_env, ty, DUMMY_SP) {
Operand::Move(place)
} else {
Operand::Copy(place)

178
compiler/rustc_mir_build/src/build/mod.rs
View File

@ -1,7 +1,7 @@
use crate::build;
use crate::build::scope::DropKind;
use crate::thir::cx::Cx;
use crate::thir::{BindingMode, LintLevel, PatKind};
use crate::thir::cx::build_thir;
use crate::thir::{Arena, BindingMode, Expr, LintLevel, Pat, PatKind};
use rustc_attr::{self as attr, UnwindAttr};
use rustc_errors::ErrorReported;
use rustc_hir as hir;
@ -9,13 +9,13 @@ use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_hir::lang_items::LangItem;
use rustc_hir::{GeneratorKind, HirIdMap, Node};
use rustc_index::vec::{Idx, IndexVec};
use rustc_infer::infer::TyCtxtInferExt;
use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
use rustc_middle::hir::place::PlaceBase as HirPlaceBase;
use rustc_middle::middle::region;
use rustc_middle::mir::*;
use rustc_middle::ty::subst::Subst;
use rustc_middle::ty::{self, Ty, TyCtxt, TypeFoldable};
use rustc_span::symbol::kw;
use rustc_middle::ty::{self, Ty, TyCtxt, TypeFoldable, TypeckResults};
use rustc_span::symbol::{kw, sym};
use rustc_span::Span;
use rustc_target::spec::abi::Abi;
use rustc_target::spec::PanicStrategy;
@ -42,6 +42,8 @@ crate fn mir_built<'tcx>(
/// Construct the MIR for a given `DefId`.
fn mir_build(tcx: TyCtxt<'_>, def: ty::WithOptConstParam<LocalDefId>) -> Body<'_> {
let id = tcx.hir().local_def_id_to_hir_id(def.did);
let body_owner_kind = tcx.hir().body_owner_kind(id);
let typeck_results = tcx.typeck_opt_const_arg(def);
// Figure out what primary body this item has.
let (body_id, return_ty_span, span_with_body) = match tcx.hir().get(id) {
@ -86,15 +88,15 @@ fn mir_build(tcx: TyCtxt<'_>, def: ty::WithOptConstParam<LocalDefId>) -> Body<'_
// If we don't have a specialized span for the body, just use the
// normal def span.
let span_with_body = span_with_body.unwrap_or_else(|| tcx.hir().span(id));
let arena = Arena::default();
tcx.infer_ctxt().enter(|infcx| {
let cx = Cx::new(&infcx, def, id);
let body = if let Some(ErrorReported) = cx.typeck_results().tainted_by_errors {
build::construct_error(cx, body_id)
} else if cx.body_owner_kind.is_fn_or_closure() {
let body = if let Some(ErrorReported) = typeck_results.tainted_by_errors {
build::construct_error(&infcx, def, id, body_id, body_owner_kind)
} else if body_owner_kind.is_fn_or_closure() {
// fetch the fully liberated fn signature (that is, all bound
// types/lifetimes replaced)
let fn_sig = cx.typeck_results().liberated_fn_sigs()[id];
let fn_sig = typeck_results.liberated_fn_sigs()[id];
let fn_def_id = tcx.hir().local_def_id(id);
let safety = match fn_sig.unsafety {
@ -103,6 +105,7 @@ fn mir_build(tcx: TyCtxt<'_>, def: ty::WithOptConstParam<LocalDefId>) -> Body<'_
};
let body = tcx.hir().body(body_id);
let thir = build_thir(tcx, def, &arena, &body.value);
let ty = tcx.type_of(fn_def_id);
let mut abi = fn_sig.abi;
let implicit_argument = match ty.kind() {
@ -178,7 +181,8 @@ fn mir_build(tcx: TyCtxt<'_>, def: ty::WithOptConstParam<LocalDefId>) -> Body<'_
};
let mut mir = build::construct_fn(
cx,
&infcx,
def,
id,
arguments,
safety,
@ -186,6 +190,7 @@ fn mir_build(tcx: TyCtxt<'_>, def: ty::WithOptConstParam<LocalDefId>) -> Body<'_
return_ty,
return_ty_span,
body,
thir,
span_with_body,
);
if yield_ty.is_some() {
@ -205,9 +210,12 @@ fn mir_build(tcx: TyCtxt<'_>, def: ty::WithOptConstParam<LocalDefId>) -> Body<'_
// place to be the type of the constant because NLL typeck will
// equate them.
let return_ty = cx.typeck_results().node_type(id);
let return_ty = typeck_results.node_type(id);
build::construct_const(cx, body_id, return_ty, return_ty_span)
let ast_expr = &tcx.hir().body(body_id).value;
let thir = build_thir(tcx, def, &arena, ast_expr);
build::construct_const(&infcx, thir, def, id, return_ty, return_ty_span)
};
lints::check(tcx, &body);
@ -304,10 +312,17 @@ impl BlockFrame {
struct BlockContext(Vec<BlockFrame>);
struct Builder<'a, 'tcx> {
hir: Cx<'a, 'tcx>,
tcx: TyCtxt<'tcx>,
infcx: &'a InferCtxt<'a, 'tcx>,
typeck_results: &'tcx TypeckResults<'tcx>,
region_scope_tree: &'tcx region::ScopeTree,
param_env: ty::ParamEnv<'tcx>,
cfg: CFG<'tcx>,
def_id: DefId,
hir_id: hir::HirId,
check_overflow: bool,
fn_span: Span,
arg_count: usize,
generator_kind: Option<GeneratorKind>,
@ -607,8 +622,9 @@ struct ArgInfo<'tcx>(
Option<ImplicitSelfKind>,
);
fn construct_fn<'a, 'tcx, A>(
hir: Cx<'a, 'tcx>,
fn construct_fn<'tcx, A>(
infcx: &InferCtxt<'_, 'tcx>,
fn_def: ty::WithOptConstParam<LocalDefId>,
fn_id: hir::HirId,
arguments: A,
safety: Safety,
@ -616,6 +632,7 @@ fn construct_fn<'a, 'tcx, A>(
return_ty: Ty<'tcx>,
return_ty_span: Span,
body: &'tcx hir::Body<'tcx>,
expr: &Expr<'_, 'tcx>,
span_with_body: Span,
) -> Body<'tcx>
where
@ -623,15 +640,13 @@ where
{
let arguments: Vec<_> = arguments.collect();
let tcx = hir.tcx();
let tcx_hir = tcx.hir();
let span = tcx_hir.span(fn_id);
let fn_def_id = tcx_hir.local_def_id(fn_id);
let tcx = infcx.tcx;
let span = tcx.hir().span(fn_id);
let mut builder = Builder::new(
hir,
fn_def_id.to_def_id(),
infcx,
fn_def,
fn_id,
span_with_body,
arguments.len(),
safety,
@ -655,16 +670,16 @@ where
Some(builder.in_scope(arg_scope_s, LintLevel::Inherited, |builder| {
builder.args_and_body(
START_BLOCK,
fn_def_id.to_def_id(),
fn_def.did.to_def_id(),
&arguments,
arg_scope,
&body.value,
expr,
)
}))
}));
let source_info = builder.source_info(fn_end);
builder.cfg.terminate(return_block, source_info, TerminatorKind::Return);
let should_abort = should_abort_on_panic(tcx, fn_def_id, abi);
let should_abort = should_abort_on_panic(tcx, fn_def.did, abi);
builder.build_drop_trees(should_abort);
return_block.unit()
}));
@ -675,7 +690,7 @@ where
} else {
None
};
debug!("fn_id {:?} has attrs {:?}", fn_def_id, tcx.get_attrs(fn_def_id.to_def_id()));
debug!("fn_id {:?} has attrs {:?}", fn_def, tcx.get_attrs(fn_def.did.to_def_id()));
let mut body = builder.finish();
body.spread_arg = spread_arg;
@ -683,22 +698,20 @@ where
}
fn construct_const<'a, 'tcx>(
hir: Cx<'a, 'tcx>,
body_id: hir::BodyId,
infcx: &'a InferCtxt<'a, 'tcx>,
expr: &Expr<'_, 'tcx>,
def: ty::WithOptConstParam<LocalDefId>,
hir_id: hir::HirId,
const_ty: Ty<'tcx>,
const_ty_span: Span,
) -> Body<'tcx> {
let tcx = hir.tcx();
let owner_id = tcx.hir().body_owner(body_id);
let def_id = tcx.hir().local_def_id(owner_id);
let span = tcx.hir().span(owner_id);
let tcx = infcx.tcx;
let span = tcx.hir().span(hir_id);
let mut builder =
Builder::new(hir, def_id.to_def_id(), span, 0, Safety::Safe, const_ty, const_ty_span, None);
Builder::new(infcx, def, hir_id, span, 0, Safety::Safe, const_ty, const_ty_span, None);
let mut block = START_BLOCK;
let ast_expr = &tcx.hir().body(body_id).value;
let expr = builder.hir.mirror(ast_expr);
unpack!(block = builder.into_expr(Place::return_place(), block, expr));
unpack!(block = builder.expr_into_dest(Place::return_place(), block, &expr));
let source_info = builder.source_info(span);
builder.cfg.terminate(block, source_info, TerminatorKind::Return);
@ -712,15 +725,19 @@ fn construct_const<'a, 'tcx>(
///
/// This is required because we may still want to run MIR passes on an item
/// with type errors, but normal MIR construction can't handle that in general.
fn construct_error<'a, 'tcx>(hir: Cx<'a, 'tcx>, body_id: hir::BodyId) -> Body<'tcx> {
let tcx = hir.tcx();
let owner_id = tcx.hir().body_owner(body_id);
let def_id = tcx.hir().local_def_id(owner_id);
let span = tcx.hir().span(owner_id);
fn construct_error<'a, 'tcx>(
infcx: &'a InferCtxt<'a, 'tcx>,
def: ty::WithOptConstParam<LocalDefId>,
hir_id: hir::HirId,
body_id: hir::BodyId,
body_owner_kind: hir::BodyOwnerKind,
) -> Body<'tcx> {
let tcx = infcx.tcx;
let span = tcx.hir().span(hir_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(),
let num_params = match body_owner_kind {
hir::BodyOwnerKind::Fn => tcx.hir().fn_decl_by_hir_id(hir_id).unwrap().inputs.len(),
hir::BodyOwnerKind::Closure => {
if generator_kind.is_some() {
// Generators have an implicit `self` parameter *and* a possibly
@ -728,22 +745,14 @@ fn construct_error<'a, 'tcx>(hir: Cx<'a, 'tcx>, body_id: hir::BodyId) -> Body<'t
2
} else {
// The implicit self parameter adds another local in MIR.
1 + tcx.hir().fn_decl_by_hir_id(owner_id).unwrap().inputs.len()
1 + tcx.hir().fn_decl_by_hir_id(hir_id).unwrap().inputs.len()
}
}
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,
generator_kind,
);
let mut builder =
Builder::new(infcx, def, hir_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.
@ -758,8 +767,9 @@ fn construct_error<'a, 'tcx>(hir: Cx<'a, 'tcx>, body_id: hir::BodyId) -> Body<'t
impl<'a, 'tcx> Builder<'a, 'tcx> {
fn new(
hir: Cx<'a, 'tcx>,
def_id: DefId,
infcx: &'a InferCtxt<'a, 'tcx>,
def: ty::WithOptConstParam<LocalDefId>,
hir_id: hir::HirId,
span: Span,
arg_count: usize,
safety: Safety,
@ -767,10 +777,30 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
return_span: Span,
generator_kind: Option<GeneratorKind>,
) -> Builder<'a, 'tcx> {
let lint_level = LintLevel::Explicit(hir.root_lint_level);
let tcx = infcx.tcx;
let attrs = tcx.hir().attrs(hir_id);
// Some functions always have overflow checks enabled,
// however, they may not get codegen'd, depending on
// the settings for the crate they are codegened in.
let mut check_overflow = tcx.sess.contains_name(attrs, sym::rustc_inherit_overflow_checks);
// Respect -C overflow-checks.
check_overflow |= tcx.sess.overflow_checks();
// Constants always need overflow checks.
check_overflow |= matches!(
tcx.hir().body_owner_kind(hir_id),
hir::BodyOwnerKind::Const | hir::BodyOwnerKind::Static(_)
);
let lint_level = LintLevel::Explicit(hir_id);
let mut builder = Builder {
hir,
def_id,
tcx,
infcx,
typeck_results: tcx.typeck_opt_const_arg(def),
region_scope_tree: tcx.region_scope_tree(def.did),
param_env: tcx.param_env(def.did),
def_id: def.did.to_def_id(),
hir_id,
check_overflow,
cfg: CFG { basic_blocks: IndexVec::new() },
fn_span: span,
arg_count,
@ -826,7 +856,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
fn_def_id: DefId,
arguments: &[ArgInfo<'tcx>],
argument_scope: region::Scope,
ast_body: &'tcx hir::Expr<'tcx>,
expr: &Expr<'_, 'tcx>,
) -> BlockAnd<()> {
// Allocate locals for the function arguments
for &ArgInfo(ty, _, arg_opt, _) in arguments.iter() {
@ -846,9 +876,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
}
}
let tcx = self.hir.tcx();
let tcx = self.tcx;
let tcx_hir = tcx.hir();
let hir_typeck_results = self.hir.typeck_results();
let hir_typeck_results = self.typeck_results;
// In analyze_closure() in upvar.rs we gathered a list of upvars used by a
// indexed closure and we stored in a map called closure_captures in TypeckResults
@ -924,14 +954,18 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
// Make sure we drop (parts of) the argument even when not matched on.
self.schedule_drop(
arg_opt.as_ref().map_or(ast_body.span, |arg| arg.pat.span),
arg_opt.as_ref().map_or(expr.span, |arg| arg.pat.span),
argument_scope,
local,
DropKind::Value,
);
if let Some(arg) = arg_opt {
let pattern = self.hir.pattern_from_hir(&arg.pat);
let pat = match tcx.hir().get(arg.pat.hir_id) {
Node::Pat(pat) | Node::Binding(pat) => pat,
node => bug!("pattern became {:?}", node),
};
let pattern = Pat::from_hir(tcx, self.param_env, self.typeck_results, pat);
let original_source_scope = self.source_scope;
let span = pattern.span;
self.set_correct_source_scope_for_arg(arg.hir_id, original_source_scope, span);
@ -966,7 +1000,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
_ => {
scope = self.declare_bindings(
scope,
ast_body.span,
expr.span,
&pattern,
matches::ArmHasGuard(false),
Some((Some(&place), span)),
@ -983,8 +1017,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
self.source_scope = source_scope;
}
let body = self.hir.mirror(ast_body);
self.into(Place::return_place(), block, body)
self.expr_into_dest(Place::return_place(), block, &expr)
}
fn set_correct_source_scope_for_arg(
@ -993,15 +1026,15 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
original_source_scope: SourceScope,
pattern_span: Span,
) {
let tcx = self.hir.tcx();
let current_root = tcx.maybe_lint_level_root_bounded(arg_hir_id, self.hir.root_lint_level);
let tcx = self.tcx;
let current_root = tcx.maybe_lint_level_root_bounded(arg_hir_id, self.hir_id);
let parent_root = tcx.maybe_lint_level_root_bounded(
self.source_scopes[original_source_scope]
.local_data
.as_ref()
.assert_crate_local()
.lint_root,
self.hir.root_lint_level,
self.hir_id,
);
if current_root != parent_root {
self.source_scope =
@ -1013,7 +1046,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
match self.unit_temp {
Some(tmp) => tmp,
None => {
let ty = self.hir.unit_ty();
let ty = self.tcx.mk_unit();
let fn_span = self.fn_span;
let tmp = self.temp(ty, fn_span);
self.unit_temp = Some(tmp);
@ -1031,7 +1064,6 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
mod block;
mod cfg;
mod expr;
mod into;
mod matches;
mod misc;
mod scope;

26
compiler/rustc_mir_build/src/build/scope.rs
View File

@ -82,7 +82,7 @@ that contains only loops and breakable blocks. It tracks where a `break`,
*/
use crate::build::{BlockAnd, BlockAndExtension, BlockFrame, Builder, CFG};
use crate::thir::{Expr, ExprRef, LintLevel};
use crate::thir::{Expr, LintLevel};
use rustc_data_structures::fx::FxHashMap;
use rustc_index::vec::IndexVec;
use rustc_middle::middle::region;
@ -516,7 +516,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
{
debug!("in_scope(region_scope={:?})", region_scope);
let source_scope = self.source_scope;
let tcx = self.hir.tcx();
let tcx = self.tcx;
if let LintLevel::Explicit(current_hir_id) = lint_level {
// Use `maybe_lint_level_root_bounded` with `root_lint_level` as a bound
// to avoid adding Hir dependences on our parents.
@ -524,10 +524,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let parent_root = tcx.maybe_lint_level_root_bounded(
self.source_scopes[source_scope].local_data.as_ref().assert_crate_local().lint_root,
self.hir.root_lint_level,
self.hir_id,
);
let current_root =
tcx.maybe_lint_level_root_bounded(current_hir_id, self.hir.root_lint_level);
let current_root = tcx.maybe_lint_level_root_bounded(current_hir_id, self.hir_id);
if parent_root != current_root {
self.source_scope = self.new_source_scope(
@ -575,7 +574,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
crate fn break_scope(
&mut self,
mut block: BasicBlock,
value: Option<ExprRef<'tcx>>,
value: Option<&Expr<'_, 'tcx>>,
target: BreakableTarget,
source_info: SourceInfo,
) -> BlockAnd<()> {
@ -612,10 +611,10 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
if let Some(value) = value {
debug!("stmt_expr Break val block_context.push(SubExpr)");
self.block_context.push(BlockFrame::SubExpr);
unpack!(block = self.into(destination, block, value));
unpack!(block = self.expr_into_dest(destination, block, value));
self.block_context.pop();
} else {
self.cfg.push_assign_unit(block, source_info, destination, self.hir.tcx())
self.cfg.push_assign_unit(block, source_info, destination, self.tcx)
}
} else {
assert!(value.is_none(), "`return` and `break` should have a destination");
@ -763,7 +762,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
) {
let needs_drop = match drop_kind {
DropKind::Value => {
if !self.hir.needs_drop(self.local_decls[local].ty) {
if !self.local_decls[local].ty.needs_drop(self.tcx, self.param_env) {
return;
}
true
@ -834,10 +833,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
}
if scope.region_scope == region_scope {
let region_scope_span =
region_scope.span(self.hir.tcx(), &self.hir.region_scope_tree);
let region_scope_span = region_scope.span(self.tcx, &self.region_scope_tree);
// Attribute scope exit drops to scope's closing brace.
let scope_end = self.hir.tcx().sess.source_map().end_point(region_scope_span);
let scope_end = self.tcx.sess.source_map().end_point(region_scope_span);
scope.drops.push(DropData {
source_info: SourceInfo { span: scope_end, scope: scope.source_scope },
@ -920,13 +918,13 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
crate fn test_bool(
&mut self,
mut block: BasicBlock,
condition: Expr<'tcx>,
condition: &Expr<'_, 'tcx>,
source_info: SourceInfo,
) -> (BasicBlock, BasicBlock) {
let cond = unpack!(block = self.as_local_operand(block, condition));
let true_block = self.cfg.start_new_block();
let false_block = self.cfg.start_new_block();
let term = TerminatorKind::if_(self.hir.tcx(), cond.clone(), true_block, false_block);
let term = TerminatorKind::if_(self.tcx, cond.clone(), true_block, false_block);
self.cfg.terminate(block, source_info, term);
match cond {

98
compiler/rustc_mir_build/src/thir/arena.rs Normal file
View File

@ -0,0 +1,98 @@
use crate::thir::*;
macro_rules! declare_arena {
([], [$($a:tt $name:ident: $ty:ty,)*]) => {
#[derive(Default)]
pub struct Arena<'thir, 'tcx> {
pub dropless: rustc_arena::DroplessArena,
drop: rustc_arena::DropArena,
$($name: rustc_arena::arena_for_type!($a[$ty]),)*
}
pub trait ArenaAllocatable<'thir, 'tcx, T = Self>: Sized {
fn allocate_on(self, arena: &'thir Arena<'thir, 'tcx>) -> &'thir mut Self;
fn allocate_from_iter(
arena: &'thir Arena<'thir, 'tcx>,
iter: impl ::std::iter::IntoIterator<Item = Self>,
) -> &'thir mut [Self];
}
impl<'thir, 'tcx, T: Copy> ArenaAllocatable<'thir, 'tcx, ()> for T {
#[inline]
fn allocate_on(self, arena: &'thir Arena<'thir, 'tcx>) -> &'thir mut Self {
arena.dropless.alloc(self)
}
#[inline]
fn allocate_from_iter(
arena: &'thir Arena<'thir, 'tcx>,
iter: impl ::std::iter::IntoIterator<Item = Self>,
) -> &'thir mut [Self] {
arena.dropless.alloc_from_iter(iter)
}
}
$(
impl<'thir, 'tcx> ArenaAllocatable<'thir, 'tcx, $ty> for $ty {
#[inline]
fn allocate_on(self, arena: &'thir Arena<'thir, 'tcx>) -> &'thir mut Self {
if !::std::mem::needs_drop::<Self>() {
return arena.dropless.alloc(self);
}
match rustc_arena::which_arena_for_type!($a[&arena.$name]) {
::std::option::Option::<&rustc_arena::TypedArena<Self>>::Some(ty_arena) => {
ty_arena.alloc(self)
}
::std::option::Option::None => unsafe { arena.drop.alloc(self) },
}
}
#[inline]
fn allocate_from_iter(
arena: &'thir Arena<'thir, 'tcx>,
iter: impl ::std::iter::IntoIterator<Item = Self>,
) -> &'thir mut [Self] {
if !::std::mem::needs_drop::<Self>() {
return arena.dropless.alloc_from_iter(iter);
}
match rustc_arena::which_arena_for_type!($a[&arena.$name]) {
::std::option::Option::<&rustc_arena::TypedArena<Self>>::Some(ty_arena) => {
ty_arena.alloc_from_iter(iter)
}
::std::option::Option::None => unsafe { arena.drop.alloc_from_iter(iter) },
}
}
}
)*
impl<'thir, 'tcx> Arena<'thir, 'tcx> {
#[inline]
pub fn alloc<T: ArenaAllocatable<'thir, 'tcx, U>, U>(&'thir self, value: T) -> &'thir mut T {
value.allocate_on(self)
}
#[allow(dead_code)] // function is never used
#[inline]
pub fn alloc_slice<T: ::std::marker::Copy>(&'thir self, value: &[T]) -> &'thir mut [T] {
if value.is_empty() {
return &mut [];
}
self.dropless.alloc_slice(value)
}
pub fn alloc_from_iter<T: ArenaAllocatable<'thir, 'tcx, U>, U>(
&'thir self,
iter: impl ::std::iter::IntoIterator<Item = T>,
) -> &'thir mut [T] {
T::allocate_from_iter(self, iter)
}
}
}
}
declare_arena!([], [
[] arm: Arm<'thir, 'tcx>,
[] expr: Expr<'thir, 'tcx>,
[] field_expr: FieldExpr<'thir, 'tcx>,
[few] inline_asm_operand: InlineAsmOperand<'thir, 'tcx>,
[] stmt: Stmt<'thir, 'tcx>,
]);

154
compiler/rustc_mir_build/src/thir/cx/block.rs
View File

@ -1,4 +1,3 @@
use crate::thir::cx::to_ref::ToRef;
use crate::thir::cx::Cx;
use crate::thir::{self, *};
@ -8,110 +7,95 @@ use rustc_middle::ty;
use rustc_index::vec::Idx;
impl<'tcx> Mirror<'tcx> for &'tcx hir::Block<'tcx> {
type Output = Block<'tcx>;
fn make_mirror(self, cx: &mut Cx<'_, 'tcx>) -> Block<'tcx> {
impl<'thir, 'tcx> Cx<'thir, 'tcx> {
crate fn mirror_block(&mut self, block: &'tcx hir::Block<'tcx>) -> Block<'thir, 'tcx> {
// We have to eagerly lower the "spine" of the statements
// in order to get the lexical scoping correctly.
let stmts = mirror_stmts(cx, self.hir_id.local_id, &*self.stmts);
let stmts = self.mirror_stmts(block.hir_id.local_id, block.stmts);
let opt_destruction_scope =
cx.region_scope_tree.opt_destruction_scope(self.hir_id.local_id);
self.region_scope_tree.opt_destruction_scope(block.hir_id.local_id);
Block {
targeted_by_break: self.targeted_by_break,
region_scope: region::Scope { id: self.hir_id.local_id, data: region::ScopeData::Node },
targeted_by_break: block.targeted_by_break,
region_scope: region::Scope {
id: block.hir_id.local_id,
data: region::ScopeData::Node,
},
opt_destruction_scope,
span: self.span,
span: block.span,
stmts,
expr: self.expr.to_ref(),
safety_mode: match self.rules {
expr: block.expr.map(|expr| self.mirror_expr(expr)),
safety_mode: match block.rules {
hir::BlockCheckMode::DefaultBlock => BlockSafety::Safe,
hir::BlockCheckMode::UnsafeBlock(..) => BlockSafety::ExplicitUnsafe(self.hir_id),
hir::BlockCheckMode::UnsafeBlock(..) => BlockSafety::ExplicitUnsafe(block.hir_id),
hir::BlockCheckMode::PushUnsafeBlock(..) => BlockSafety::PushUnsafe,
hir::BlockCheckMode::PopUnsafeBlock(..) => BlockSafety::PopUnsafe,
},
}
}
}
fn mirror_stmts<'a, 'tcx>(
cx: &mut Cx<'a, 'tcx>,
block_id: hir::ItemLocalId,
stmts: &'tcx [hir::Stmt<'tcx>],
) -> Vec<StmtRef<'tcx>> {
let mut result = vec![];
for (index, stmt) in stmts.iter().enumerate() {
let hir_id = stmt.hir_id;
let opt_dxn_ext = cx.region_scope_tree.opt_destruction_scope(hir_id.local_id);
match stmt.kind {
hir::StmtKind::Expr(ref expr) | hir::StmtKind::Semi(ref expr) => {
result.push(StmtRef::Mirror(Box::new(Stmt {
fn mirror_stmts(
&mut self,
block_id: hir::ItemLocalId,
stmts: &'tcx [hir::Stmt<'tcx>],
) -> &'thir [Stmt<'thir, 'tcx>] {
self.arena.alloc_from_iter(stmts.iter().enumerate().filter_map(|(index, stmt)| {
let hir_id = stmt.hir_id;
let opt_dxn_ext = self.region_scope_tree.opt_destruction_scope(hir_id.local_id);
match stmt.kind {
hir::StmtKind::Expr(ref expr) | hir::StmtKind::Semi(ref expr) => Some(Stmt {
kind: StmtKind::Expr {
scope: region::Scope { id: hir_id.local_id, data: region::ScopeData::Node },
expr: expr.to_ref(),
expr: self.mirror_expr(expr),
},
opt_destruction_scope: opt_dxn_ext,
})))
}
hir::StmtKind::Item(..) => {
// ignore for purposes of the MIR
}
hir::StmtKind::Local(ref local) => {
let remainder_scope = region::Scope {
id: block_id,
data: region::ScopeData::Remainder(region::FirstStatementIndex::new(index)),
};
let mut pattern = cx.pattern_from_hir(&local.pat);
if let Some(ty) = &local.ty {
if let Some(&user_ty) = cx.typeck_results.user_provided_types().get(ty.hir_id) {
debug!("mirror_stmts: user_ty={:?}", user_ty);
pattern = Pat {
ty: pattern.ty,
span: pattern.span,
kind: Box::new(PatKind::AscribeUserType {
ascription: thir::pattern::Ascription {
user_ty: PatTyProj::from_user_type(user_ty),
user_ty_span: ty.span,
variance: ty::Variance::Covariant,
},
subpattern: pattern,
}),
};
}
}),
hir::StmtKind::Item(..) => {
// ignore for purposes of the MIR
None
}
hir::StmtKind::Local(ref local) => {
let remainder_scope = region::Scope {
id: block_id,
data: region::ScopeData::Remainder(region::FirstStatementIndex::new(index)),
};
result.push(StmtRef::Mirror(Box::new(Stmt {
kind: StmtKind::Let {
remainder_scope,
init_scope: region::Scope {
id: hir_id.local_id,
data: region::ScopeData::Node,
let mut pattern = self.pattern_from_hir(local.pat);
if let Some(ty) = &local.ty {
if let Some(&user_ty) =
self.typeck_results.user_provided_types().get(ty.hir_id)
{
debug!("mirror_stmts: user_ty={:?}", user_ty);
pattern = Pat {
ty: pattern.ty,
span: pattern.span,
kind: Box::new(PatKind::AscribeUserType {
ascription: thir::pattern::Ascription {
user_ty: PatTyProj::from_user_type(user_ty),
user_ty_span: ty.span,
variance: ty::Variance::Covariant,
},
subpattern: pattern,
}),
};
}
}
Some(Stmt {
kind: StmtKind::Let {
remainder_scope,
init_scope: region::Scope {
id: hir_id.local_id,
data: region::ScopeData::Node,
},
pattern,
initializer: local.init.map(|init| self.mirror_expr(init)),
lint_level: LintLevel::Explicit(local.hir_id),
},
pattern,
initializer: local.init.to_ref(),
lint_level: LintLevel::Explicit(local.hir_id),
},
opt_destruction_scope: opt_dxn_ext,
})));
opt_destruction_scope: opt_dxn_ext,
})
}
}
}
}))
}
result
}
crate fn to_expr_ref<'a, 'tcx>(
cx: &mut Cx<'a, 'tcx>,
block: &'tcx hir::Block<'tcx>,
) -> ExprRef<'tcx> {
let block_ty = cx.typeck_results().node_type(block.hir_id);
let temp_lifetime = cx.region_scope_tree.temporary_scope(block.hir_id.local_id);
let expr = Expr {
ty: block_ty,
temp_lifetime,
span: block.span,
kind: ExprKind::Block { body: block },
};
expr.to_ref()
}

1757
compiler/rustc_mir_build/src/thir/cx/expr.rs
View File

File diff suppressed because it is too large Load Diff

163
compiler/rustc_mir_build/src/thir/cx/mod.rs
View File

@ -2,6 +2,7 @@
//! 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::arena::Arena;
use crate::thir::util::UserAnnotatedTyHelpers;
use crate::thir::*;
@ -9,118 +10,48 @@ use rustc_ast as ast;
use rustc_hir as hir;
use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_hir::Node;
use rustc_index::vec::Idx;
use rustc_infer::infer::InferCtxt;
use rustc_middle::middle::region;
use rustc_middle::mir::interpret::{LitToConstError, LitToConstInput};
use rustc_middle::ty::subst::Subst;
use rustc_middle::ty::subst::{GenericArg, InternalSubsts};
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_span::symbol::{sym, Symbol};
use rustc_target::abi::VariantIdx;
use rustc_trait_selection::infer::InferCtxtExt;
#[derive(Clone)]
crate struct Cx<'a, 'tcx> {
crate fn build_thir<'thir, 'tcx>(
tcx: TyCtxt<'tcx>,
infcx: &'a InferCtxt<'a, 'tcx>,
owner_def: ty::WithOptConstParam<LocalDefId>,
arena: &'thir Arena<'thir, 'tcx>,
expr: &'tcx hir::Expr<'tcx>,
) -> &'thir Expr<'thir, 'tcx> {
Cx::new(tcx, owner_def, &arena).mirror_expr(expr)
}
struct Cx<'thir, 'tcx> {
tcx: TyCtxt<'tcx>,
arena: &'thir Arena<'thir, 'tcx>,
crate root_lint_level: hir::HirId,
crate param_env: ty::ParamEnv<'tcx>,
/// Identity `InternalSubsts` for use with const-evaluation.
crate identity_substs: &'tcx InternalSubsts<'tcx>,
crate region_scope_tree: &'tcx region::ScopeTree,
crate typeck_results: &'a ty::TypeckResults<'tcx>,
/// This is `Constness::Const` if we are compiling a `static`,
/// `const`, or the body of a `const fn`.
constness: hir::Constness,
crate typeck_results: &'tcx ty::TypeckResults<'tcx>,
/// The `DefId` of the owner of this body.
body_owner: DefId,
/// What kind of body is being compiled.
crate body_owner_kind: hir::BodyOwnerKind,
/// Whether this constant/function needs overflow checks.
check_overflow: bool,
}
impl<'a, 'tcx> Cx<'a, 'tcx> {
crate fn new(
infcx: &'a InferCtxt<'a, 'tcx>,
impl<'thir, 'tcx> Cx<'thir, 'tcx> {
fn new(
tcx: TyCtxt<'tcx>,
def: ty::WithOptConstParam<LocalDefId>,
src_id: hir::HirId,
) -> Cx<'a, 'tcx> {
let tcx = infcx.tcx;
arena: &'thir Arena<'thir, 'tcx>,
) -> Cx<'thir, 'tcx> {
let typeck_results = tcx.typeck_opt_const_arg(def);
let body_owner_kind = tcx.hir().body_owner_kind(src_id);
let constness = match body_owner_kind {
hir::BodyOwnerKind::Const | hir::BodyOwnerKind::Static(_) => hir::Constness::Const,
hir::BodyOwnerKind::Closure | hir::BodyOwnerKind::Fn => hir::Constness::NotConst,
};
let attrs = tcx.hir().attrs(src_id);
// Some functions always have overflow checks enabled,
// however, they may not get codegen'd, depending on
// the settings for the crate they are codegened in.
let mut check_overflow = tcx.sess.contains_name(attrs, sym::rustc_inherit_overflow_checks);
// Respect -C overflow-checks.
check_overflow |= tcx.sess.overflow_checks();
// Constants always need overflow checks.
check_overflow |= constness == hir::Constness::Const;
Cx {
tcx,
infcx,
root_lint_level: src_id,
arena,
param_env: tcx.param_env(def.did),
identity_substs: InternalSubsts::identity_for_item(tcx, def.did.to_def_id()),
region_scope_tree: tcx.region_scope_tree(def.did),
typeck_results,
constness,
body_owner: def.did.to_def_id(),
body_owner_kind,
check_overflow,
}
}
}
impl<'a, 'tcx> Cx<'a, 'tcx> {
/// Normalizes `ast` into the appropriate "mirror" type.
crate fn mirror<M: Mirror<'tcx>>(&mut self, ast: M) -> M::Output {
ast.make_mirror(self)
}
crate fn usize_ty(&mut self) -> Ty<'tcx> {
self.tcx.types.usize
}
crate fn usize_literal(&mut self, value: u64) -> &'tcx ty::Const<'tcx> {
ty::Const::from_usize(self.tcx, value)
}
crate fn bool_ty(&mut self) -> Ty<'tcx> {
self.tcx.types.bool
}
crate fn unit_ty(&mut self) -> Ty<'tcx> {
self.tcx.mk_unit()
}
crate fn true_literal(&mut self) -> &'tcx ty::Const<'tcx> {
ty::Const::from_bool(self.tcx, true)
}
crate fn false_literal(&mut self) -> &'tcx ty::Const<'tcx> {
ty::Const::from_bool(self.tcx, false)
}
crate fn const_eval_literal(
&mut self,
@ -154,69 +85,17 @@ impl<'a, 'tcx> Cx<'a, 'tcx> {
};
Pat::from_hir(self.tcx, self.param_env, self.typeck_results(), p)
}
crate fn trait_method(
&mut self,
trait_def_id: DefId,
method_name: Symbol,
self_ty: Ty<'tcx>,
params: &[GenericArg<'tcx>],
) -> &'tcx ty::Const<'tcx> {
let substs = self.tcx.mk_substs_trait(self_ty, params);
// The unhygienic comparison here is acceptable because this is only
// used on known traits.
let item = self
.tcx
.associated_items(trait_def_id)
.filter_by_name_unhygienic(method_name)
.find(|item| item.kind == ty::AssocKind::Fn)
.expect("trait method not found");
let method_ty = self.tcx.type_of(item.def_id);
let method_ty = method_ty.subst(self.tcx, substs);
ty::Const::zero_sized(self.tcx, method_ty)
}
crate fn all_fields(&mut self, adt_def: &ty::AdtDef, variant_index: VariantIdx) -> Vec<Field> {
(0..adt_def.variants[variant_index].fields.len()).map(Field::new).collect()
}
crate fn needs_drop(&mut self, ty: Ty<'tcx>) -> bool {
ty.needs_drop(self.tcx, self.param_env)
}
crate fn infcx(&self) -> &'a InferCtxt<'a, 'tcx> {
self.infcx
}
crate fn tcx(&self) -> TyCtxt<'tcx> {
self.tcx
}
crate fn typeck_results(&self) -> &'a ty::TypeckResults<'tcx> {
self.typeck_results
}
crate fn check_overflow(&self) -> bool {
self.check_overflow
}
crate fn type_is_copy_modulo_regions(&self, ty: Ty<'tcx>, span: Span) -> bool {
self.infcx.type_is_copy_modulo_regions(self.param_env, ty, span)
}
}
impl<'tcx> UserAnnotatedTyHelpers<'tcx> for Cx<'_, 'tcx> {
fn tcx(&self) -> TyCtxt<'tcx> {
self.tcx()
self.tcx
}
fn typeck_results(&self) -> &ty::TypeckResults<'tcx> {
self.typeck_results()
self.typeck_results
}
}
mod block;
mod expr;
mod to_ref;

65
compiler/rustc_mir_build/src/thir/cx/to_ref.rs
View File

@ -1,65 +0,0 @@
use crate::thir::*;
use rustc_hir as hir;
crate trait ToRef {
type Output;
fn to_ref(self) -> Self::Output;
}
impl<'tcx> ToRef for &'tcx hir::Expr<'tcx> {
type Output = ExprRef<'tcx>;
fn to_ref(self) -> ExprRef<'tcx> {
ExprRef::Thir(self)
}
}
impl<'tcx> ToRef for &'tcx &'tcx hir::Expr<'tcx> {
type Output = ExprRef<'tcx>;
fn to_ref(self) -> ExprRef<'tcx> {
ExprRef::Thir(&**self)
}
}
impl<'tcx> ToRef for Expr<'tcx> {
type Output = ExprRef<'tcx>;
fn to_ref(self) -> ExprRef<'tcx> {
ExprRef::Mirror(Box::new(self))
}
}
impl<'tcx, T, U> ToRef for &'tcx Option<T>
where
&'tcx T: ToRef<Output = U>,
{
type Output = Option<U>;
fn to_ref(self) -> Option<U> {
self.as_ref().map(|expr| expr.to_ref())
}
}
impl<'tcx, T, U> ToRef for &'tcx Vec<T>
where
&'tcx T: ToRef<Output = U>,
{
type Output = Vec<U>;
fn to_ref(self) -> Vec<U> {
self.iter().map(|expr| expr.to_ref()).collect()
}
}
impl<'tcx, T, U> ToRef for &'tcx [T]
where
&'tcx T: ToRef<Output = U>,
{
type Output = Vec<U>;
fn to_ref(self) -> Vec<U> {
self.iter().map(|expr| expr.to_ref()).collect()
}
}

266
compiler/rustc_mir_build/src/thir/mod.rs
View File

@ -4,7 +4,6 @@
//! unit-tested and separated from the Rust source and compiler data
//! structures.
use self::cx::Cx;
use rustc_ast::{InlineAsmOptions, InlineAsmTemplatePiece};
use rustc_hir as hir;
use rustc_hir::def_id::DefId;
@ -25,6 +24,9 @@ crate mod pattern;
crate use self::pattern::PatTyProj;
crate use self::pattern::{BindingMode, FieldPat, Pat, PatKind, PatRange};
mod arena;
crate use arena::Arena;
mod util;
#[derive(Copy, Clone, Debug)]
@ -33,14 +35,14 @@ crate enum LintLevel {
Explicit(hir::HirId),
}
#[derive(Clone, Debug)]
crate struct Block<'tcx> {
#[derive(Debug)]
crate struct Block<'thir, 'tcx> {
crate targeted_by_break: bool,
crate region_scope: region::Scope,
crate opt_destruction_scope: Option<region::Scope>,
crate span: Span,
crate stmts: Vec<StmtRef<'tcx>>,
crate expr: Option<ExprRef<'tcx>>,
crate stmts: &'thir [Stmt<'thir, 'tcx>],
crate expr: Option<&'thir Expr<'thir, 'tcx>>,
crate safety_mode: BlockSafety,
}
@ -52,25 +54,20 @@ crate enum BlockSafety {
PopUnsafe,
}
#[derive(Clone, Debug)]
crate enum StmtRef<'tcx> {
Mirror(Box<Stmt<'tcx>>),
}
#[derive(Clone, Debug)]
crate struct Stmt<'tcx> {
crate kind: StmtKind<'tcx>,
#[derive(Debug)]
crate struct Stmt<'thir, 'tcx> {
crate kind: StmtKind<'thir, 'tcx>,
crate opt_destruction_scope: Option<region::Scope>,
}
#[derive(Clone, Debug)]
crate enum StmtKind<'tcx> {
#[derive(Debug)]
crate enum StmtKind<'thir, 'tcx> {
Expr {
/// scope for this statement; may be used as lifetime of temporaries
scope: region::Scope,
/// expression being evaluated in this statement
expr: ExprRef<'tcx>,
expr: &'thir Expr<'thir, 'tcx>,
},
Let {
@ -88,7 +85,7 @@ crate enum StmtKind<'tcx> {
pattern: Pat<'tcx>,
/// let pat: ty = <INIT> ...
initializer: Option<ExprRef<'tcx>>,
initializer: Option<&'thir Expr<'thir, 'tcx>>,
/// the lint level for this let-statement
lint_level: LintLevel,
@ -97,12 +94,12 @@ crate enum StmtKind<'tcx> {
// `Expr` is used a lot. Make sure it doesn't unintentionally get bigger.
#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
rustc_data_structures::static_assert_size!(Expr<'_>, 168);
rustc_data_structures::static_assert_size!(Expr<'_, '_>, 144);
/// The Thir trait implementor lowers their expressions (`&'tcx H::Expr`)
/// into instances of this `Expr` enum. This lowering can be done
/// basically as lazily or as eagerly as desired: every recursive
/// reference to an expression in this enum is an `ExprRef<'tcx>`, which
/// reference to an expression in this enum is an `&'thir Expr<'thir, 'tcx>`, which
/// may in turn be another instance of this enum (boxed), or else an
/// unlowered `&'tcx H::Expr`. Note that instances of `Expr` are very
/// short-lived. They are created by `Thir::to_expr`, analyzed and
@ -113,8 +110,8 @@ rustc_data_structures::static_assert_size!(Expr<'_>, 168);
/// MIR simplifications are already done in the impl of `Thir`. For
/// example, method calls and overloaded operators are absent: they are
/// expected to be converted into `Expr::Call` instances.
#[derive(Clone, Debug)]
crate struct Expr<'tcx> {
#[derive(Debug)]
crate struct Expr<'thir, 'tcx> {
/// type of this expression
crate ty: Ty<'tcx>,
@ -126,92 +123,92 @@ crate struct Expr<'tcx> {
crate span: Span,
/// kind of expression
crate kind: ExprKind<'tcx>,
crate kind: ExprKind<'thir, 'tcx>,
}
#[derive(Clone, Debug)]
crate enum ExprKind<'tcx> {
#[derive(Debug)]
crate enum ExprKind<'thir, 'tcx> {
Scope {
region_scope: region::Scope,
lint_level: LintLevel,
value: ExprRef<'tcx>,
value: &'thir Expr<'thir, 'tcx>,
},
Box {
value: ExprRef<'tcx>,
value: &'thir Expr<'thir, 'tcx>,
},
If {
cond: ExprRef<'tcx>,
then: ExprRef<'tcx>,
else_opt: Option<ExprRef<'tcx>>,
cond: &'thir Expr<'thir, 'tcx>,
then: &'thir Expr<'thir, 'tcx>,
else_opt: Option<&'thir Expr<'thir, 'tcx>>,
},
Call {
ty: Ty<'tcx>,
fun: ExprRef<'tcx>,
args: Vec<ExprRef<'tcx>>,
// Whether this is from a call in HIR, rather than from an overloaded
// operator. True for overloaded function call.
fun: &'thir Expr<'thir, 'tcx>,
args: &'thir [Expr<'thir, 'tcx>],
/// Whether this is from a call in HIR, rather than from an overloaded
/// operator. `true` for overloaded function call.
from_hir_call: bool,
/// This `Span` is the span of the function, without the dot and receiver
/// (e.g. `foo(a, b)` in `x.foo(a, b)`
fn_span: Span,
},
Deref {
arg: ExprRef<'tcx>,
arg: &'thir Expr<'thir, 'tcx>,
}, // NOT overloaded!
Binary {
op: BinOp,
lhs: ExprRef<'tcx>,
rhs: ExprRef<'tcx>,
lhs: &'thir Expr<'thir, 'tcx>,
rhs: &'thir Expr<'thir, 'tcx>,
}, // NOT overloaded!
LogicalOp {
op: LogicalOp,
lhs: ExprRef<'tcx>,
rhs: ExprRef<'tcx>,
lhs: &'thir Expr<'thir, 'tcx>,
rhs: &'thir Expr<'thir, 'tcx>,
}, // NOT overloaded!
// LogicalOp is distinct from BinaryOp because of lazy evaluation of the operands.
Unary {
op: UnOp,
arg: ExprRef<'tcx>,
arg: &'thir Expr<'thir, 'tcx>,
}, // NOT overloaded!
Cast {
source: ExprRef<'tcx>,
source: &'thir Expr<'thir, 'tcx>,
},
Use {
source: ExprRef<'tcx>,
source: &'thir Expr<'thir, 'tcx>,
}, // Use a lexpr to get a vexpr.
NeverToAny {
source: ExprRef<'tcx>,
source: &'thir Expr<'thir, 'tcx>,
},
Pointer {
cast: PointerCast,
source: ExprRef<'tcx>,
source: &'thir Expr<'thir, 'tcx>,
},
Loop {
body: ExprRef<'tcx>,
body: &'thir Expr<'thir, 'tcx>,
},
Match {
scrutinee: ExprRef<'tcx>,
arms: Vec<Arm<'tcx>>,
scrutinee: &'thir Expr<'thir, 'tcx>,
arms: &'thir [Arm<'thir, 'tcx>],
},
Block {
body: &'tcx hir::Block<'tcx>,
body: Block<'thir, 'tcx>,
},
Assign {
lhs: ExprRef<'tcx>,
rhs: ExprRef<'tcx>,
lhs: &'thir Expr<'thir, 'tcx>,
rhs: &'thir Expr<'thir, 'tcx>,
},
AssignOp {
op: BinOp,
lhs: ExprRef<'tcx>,
rhs: ExprRef<'tcx>,
lhs: &'thir Expr<'thir, 'tcx>,
rhs: &'thir Expr<'thir, 'tcx>,
},
Field {
lhs: ExprRef<'tcx>,
lhs: &'thir Expr<'thir, 'tcx>,
name: Field,
},
Index {
lhs: ExprRef<'tcx>,
index: ExprRef<'tcx>,
lhs: &'thir Expr<'thir, 'tcx>,
index: &'thir Expr<'thir, 'tcx>,
},
VarRef {
id: hir::HirId,
@ -226,35 +223,35 @@ crate enum ExprKind<'tcx> {
},
Borrow {
borrow_kind: BorrowKind,
arg: ExprRef<'tcx>,
arg: &'thir Expr<'thir, 'tcx>,
},
/// A `&raw [const|mut] $place_expr` raw borrow resulting in type `*[const|mut] T`.
AddressOf {
mutability: hir::Mutability,
arg: ExprRef<'tcx>,
arg: &'thir Expr<'thir, 'tcx>,
},
Break {
label: region::Scope,
value: Option<ExprRef<'tcx>>,
value: Option<&'thir Expr<'thir, 'tcx>>,
},
Continue {
label: region::Scope,
},
Return {
value: Option<ExprRef<'tcx>>,
value: Option<&'thir Expr<'thir, 'tcx>>,
},
ConstBlock {
value: &'tcx Const<'tcx>,
},
Repeat {
value: ExprRef<'tcx>,
value: &'thir Expr<'thir, 'tcx>,
count: &'tcx Const<'tcx>,
},
Array {
fields: Vec<ExprRef<'tcx>>,
fields: &'thir [Expr<'thir, 'tcx>],
},
Tuple {
fields: Vec<ExprRef<'tcx>>,
fields: &'thir [Expr<'thir, 'tcx>],
},
Adt {
adt_def: &'tcx AdtDef,
@ -265,23 +262,23 @@ crate enum ExprKind<'tcx> {
/// Bar::<T> { ... }`.
user_ty: Option<Canonical<'tcx, UserType<'tcx>>>,
fields: Vec<FieldExprRef<'tcx>>,
base: Option<FruInfo<'tcx>>,
fields: &'thir [FieldExpr<'thir, 'tcx>],
base: Option<FruInfo<'thir, 'tcx>>,
},
PlaceTypeAscription {
source: ExprRef<'tcx>,
source: &'thir Expr<'thir, 'tcx>,
/// Type that the user gave to this expression
user_ty: Option<Canonical<'tcx, UserType<'tcx>>>,
},
ValueTypeAscription {
source: ExprRef<'tcx>,
source: &'thir Expr<'thir, 'tcx>,
/// Type that the user gave to this expression
user_ty: Option<Canonical<'tcx, UserType<'tcx>>>,
},
Closure {
closure_id: DefId,
substs: UpvarSubsts<'tcx>,
upvars: Vec<ExprRef<'tcx>>,
upvars: &'thir [Expr<'thir, 'tcx>],
movability: Option<hir::Movability>,
},
Literal {
@ -302,7 +299,7 @@ crate enum ExprKind<'tcx> {
},
InlineAsm {
template: &'tcx [InlineAsmTemplatePiece],
operands: Vec<InlineAsmOperand<'tcx>>,
operands: &'thir [InlineAsmOperand<'thir, 'tcx>],
options: InlineAsmOptions,
line_spans: &'tcx [Span],
},
@ -310,46 +307,40 @@ crate enum ExprKind<'tcx> {
ThreadLocalRef(DefId),
LlvmInlineAsm {
asm: &'tcx hir::LlvmInlineAsmInner,
outputs: Vec<ExprRef<'tcx>>,
inputs: Vec<ExprRef<'tcx>>,
outputs: &'thir [Expr<'thir, 'tcx>],
inputs: &'thir [Expr<'thir, 'tcx>],
},
Yield {
value: ExprRef<'tcx>,
value: &'thir Expr<'thir, 'tcx>,
},
}
#[derive(Clone, Debug)]
crate enum ExprRef<'tcx> {
Thir(&'tcx hir::Expr<'tcx>),
Mirror(Box<Expr<'tcx>>),
}
#[derive(Clone, Debug)]
crate struct FieldExprRef<'tcx> {
#[derive(Debug)]
crate struct FieldExpr<'thir, 'tcx> {
crate name: Field,
crate expr: ExprRef<'tcx>,
crate expr: &'thir Expr<'thir, 'tcx>,
}
#[derive(Clone, Debug)]
crate struct FruInfo<'tcx> {
crate base: ExprRef<'tcx>,
crate field_types: Vec<Ty<'tcx>>,
#[derive(Debug)]
crate struct FruInfo<'thir, 'tcx> {
crate base: &'thir Expr<'thir, 'tcx>,
crate field_types: &'thir [Ty<'tcx>],
}
#[derive(Clone, Debug)]
crate struct Arm<'tcx> {
#[derive(Debug)]
crate struct Arm<'thir, 'tcx> {
crate pattern: Pat<'tcx>,
crate guard: Option<Guard<'tcx>>,
crate body: ExprRef<'tcx>,
crate guard: Option<Guard<'thir, 'tcx>>,
crate body: &'thir Expr<'thir, 'tcx>,
crate lint_level: LintLevel,
crate scope: region::Scope,
crate span: Span,
}
#[derive(Clone, Debug)]
crate enum Guard<'tcx> {
If(ExprRef<'tcx>),
IfLet(Pat<'tcx>, ExprRef<'tcx>),
#[derive(Debug)]
crate enum Guard<'thir, 'tcx> {
If(&'thir Expr<'thir, 'tcx>),
IfLet(Pat<'tcx>, &'thir Expr<'thir, 'tcx>),
}
#[derive(Copy, Clone, Debug)]
@ -358,110 +349,35 @@ crate enum LogicalOp {
Or,
}
impl<'tcx> ExprRef<'tcx> {
crate fn span(&self) -> Span {
match self {
ExprRef::Thir(expr) => expr.span,
ExprRef::Mirror(expr) => expr.span,
}
}
}
#[derive(Clone, Debug)]
crate enum InlineAsmOperand<'tcx> {
#[derive(Debug)]
crate enum InlineAsmOperand<'thir, 'tcx> {
In {
reg: InlineAsmRegOrRegClass,
expr: ExprRef<'tcx>,
expr: &'thir Expr<'thir, 'tcx>,
},
Out {
reg: InlineAsmRegOrRegClass,
late: bool,
expr: Option<ExprRef<'tcx>>,
expr: Option<&'thir Expr<'thir, 'tcx>>,
},
InOut {
reg: InlineAsmRegOrRegClass,
late: bool,
expr: ExprRef<'tcx>,
expr: &'thir Expr<'thir, 'tcx>,
},
SplitInOut {
reg: InlineAsmRegOrRegClass,
late: bool,
in_expr: ExprRef<'tcx>,
out_expr: Option<ExprRef<'tcx>>,
in_expr: &'thir Expr<'thir, 'tcx>,
out_expr: Option<&'thir Expr<'thir, 'tcx>>,
},
Const {
expr: ExprRef<'tcx>,
expr: &'thir Expr<'thir, 'tcx>,
},
SymFn {
expr: ExprRef<'tcx>,
expr: &'thir Expr<'thir, 'tcx>,
},
SymStatic {
def_id: DefId,
},
}
///////////////////////////////////////////////////////////////////////////
// The Mirror trait
/// "Mirroring" is the process of converting from a HIR type into one
/// of the THIR types defined in this file. This is basically a "on
/// the fly" desugaring step that hides a lot of the messiness in the
/// tcx. For example, the mirror of a `&'tcx hir::Expr` is an
/// `Expr<'tcx>`.
///
/// Mirroring is gradual: when you mirror an outer expression like `e1
/// + e2`, the references to the inner expressions `e1` and `e2` are
/// `ExprRef<'tcx>` instances, and they may or may not be eagerly
/// mirrored. This allows a single AST node from the compiler to
/// expand into one or more Thir nodes, which lets the Thir nodes be
/// simpler.
crate trait Mirror<'tcx> {
type Output;
fn make_mirror(self, cx: &mut Cx<'_, 'tcx>) -> Self::Output;
}
impl<'tcx> Mirror<'tcx> for Expr<'tcx> {
type Output = Expr<'tcx>;
fn make_mirror(self, _: &mut Cx<'_, 'tcx>) -> Expr<'tcx> {
self
}
}
impl<'tcx> Mirror<'tcx> for ExprRef<'tcx> {
type Output = Expr<'tcx>;
fn make_mirror(self, hir: &mut Cx<'_, 'tcx>) -> Expr<'tcx> {
match self {
ExprRef::Thir(h) => h.make_mirror(hir),
ExprRef::Mirror(m) => *m,
}
}
}
impl<'tcx> Mirror<'tcx> for Stmt<'tcx> {
type Output = Stmt<'tcx>;
fn make_mirror(self, _: &mut Cx<'_, 'tcx>) -> Stmt<'tcx> {
self
}
}
impl<'tcx> Mirror<'tcx> for StmtRef<'tcx> {
type Output = Stmt<'tcx>;
fn make_mirror(self, _: &mut Cx<'_, 'tcx>) -> Stmt<'tcx> {
match self {
StmtRef::Mirror(m) => *m,
}
}
}
impl<'tcx> Mirror<'tcx> for Block<'tcx> {
type Output = Block<'tcx>;
fn make_mirror(self, _: &mut Cx<'_, 'tcx>) -> Block<'tcx> {
self
}
}