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use rustc_middle::mir::interpret::{ConstValue, Scalar};
use rustc_middle::mir::tcx::PlaceTy;
use rustc_middle::{mir::*, thir::*, ty};
use rustc_span::Span;
use rustc_target::abi::VariantIdx;
use crate::build::custom::ParseError;
use crate::build::expr::as_constant::as_constant_inner;
use super::{parse_by_kind, PResult, ParseCtxt};
impl<'tcx, 'body> ParseCtxt<'tcx, 'body> {
pub fn parse_statement(&self, expr_id: ExprId) -> PResult<StatementKind<'tcx>> {
parse_by_kind!(self, expr_id, _, "statement",
@call("mir_retag", args) => {
Ok(StatementKind::Retag(RetagKind::Default, Box::new(self.parse_place(args[0])?)))
},
@call("mir_retag_raw", args) => {
Ok(StatementKind::Retag(RetagKind::Raw, Box::new(self.parse_place(args[0])?)))
},
@call("mir_set_discriminant", args) => {
let place = self.parse_place(args[0])?;
let var = self.parse_integer_literal(args[1])? as u32;
Ok(StatementKind::SetDiscriminant {
place: Box::new(place),
variant_index: VariantIdx::from_u32(var),
})
},
ExprKind::Assign { lhs, rhs } => {
let lhs = self.parse_place(*lhs)?;
let rhs = self.parse_rvalue(*rhs)?;
Ok(StatementKind::Assign(Box::new((lhs, rhs))))
},
)
}
pub fn parse_terminator(&self, expr_id: ExprId) -> PResult<TerminatorKind<'tcx>> {
parse_by_kind!(self, expr_id, expr, "terminator",
@call("mir_return", _args) => {
Ok(TerminatorKind::Return)
},
@call("mir_goto", args) => {
Ok(TerminatorKind::Goto { target: self.parse_block(args[0])? } )
},
ExprKind::Match { scrutinee, arms } => {
let discr = self.parse_operand(*scrutinee)?;
self.parse_match(arms, expr.span).map(|t| TerminatorKind::SwitchInt { discr, targets: t })
},
)
}
fn parse_match(&self, arms: &[ArmId], span: Span) -> PResult<SwitchTargets> {
let Some((otherwise, rest)) = arms.split_last() else {
return Err(ParseError {
span,
item_description: format!("no arms"),
expected: "at least one arm".to_string(),
})
};
let otherwise = &self.thir[*otherwise];
let PatKind::Wild = otherwise.pattern.kind else {
return Err(ParseError {
span: otherwise.span,
item_description: format!("{:?}", otherwise.pattern.kind),
expected: "wildcard pattern".to_string(),
})
};
let otherwise = self.parse_block(otherwise.body)?;
let mut values = Vec::new();
let mut targets = Vec::new();
for arm in rest {
let arm = &self.thir[*arm];
let PatKind::Constant { value } = arm.pattern.kind else {
return Err(ParseError {
span: arm.pattern.span,
item_description: format!("{:?}", arm.pattern.kind),
expected: "constant pattern".to_string(),
})
};
values.push(value.eval_bits(self.tcx, self.param_env, arm.pattern.ty));
targets.push(self.parse_block(arm.body)?);
}
Ok(SwitchTargets::new(values.into_iter().zip(targets), otherwise))
}
fn parse_rvalue(&self, expr_id: ExprId) -> PResult<Rvalue<'tcx>> {
parse_by_kind!(self, expr_id, _, "rvalue",
@call("mir_discriminant", args) => self.parse_place(args[0]).map(Rvalue::Discriminant),
ExprKind::Borrow { borrow_kind, arg } => Ok(
Rvalue::Ref(self.tcx.lifetimes.re_erased, *borrow_kind, self.parse_place(*arg)?)
),
ExprKind::AddressOf { mutability, arg } => Ok(
Rvalue::AddressOf(*mutability, self.parse_place(*arg)?)
),
_ => self.parse_operand(expr_id).map(Rvalue::Use),
)
}
fn parse_operand(&self, expr_id: ExprId) -> PResult<Operand<'tcx>> {
parse_by_kind!(self, expr_id, expr, "operand",
@call("mir_move", args) => self.parse_place(args[0]).map(Operand::Move),
@call("mir_static", args) => self.parse_static(args[0]),
@call("mir_static_mut", args) => self.parse_static(args[0]),
ExprKind::Literal { .. }
| ExprKind::NamedConst { .. }
| ExprKind::NonHirLiteral { .. }
| ExprKind::ZstLiteral { .. }
| ExprKind::ConstParam { .. }
| ExprKind::ConstBlock { .. } => {
Ok(Operand::Constant(Box::new(
as_constant_inner(expr, |_| None, self.tcx)
)))
},
_ => self.parse_place(expr_id).map(Operand::Copy),
)
}
fn parse_place(&self, expr_id: ExprId) -> PResult<Place<'tcx>> {
self.parse_place_inner(expr_id).map(|(x, _)| x)
}
fn parse_place_inner(&self, expr_id: ExprId) -> PResult<(Place<'tcx>, PlaceTy<'tcx>)> {
let (parent, proj) = parse_by_kind!(self, expr_id, expr, "place",
@call("mir_field", args) => {
let (parent, ty) = self.parse_place_inner(args[0])?;
let field = Field::from_u32(self.parse_integer_literal(args[1])? as u32);
let field_ty = ty.field_ty(self.tcx, field);
let proj = PlaceElem::Field(field, field_ty);
let place = parent.project_deeper(&[proj], self.tcx);
return Ok((place, PlaceTy::from_ty(field_ty)));
},
@call("mir_variant", args) => {
(args[0], PlaceElem::Downcast(
None,
VariantIdx::from_u32(self.parse_integer_literal(args[1])? as u32)
))
},
ExprKind::Deref { arg } => {
parse_by_kind!(self, *arg, _, "does not matter",
@call("mir_make_place", args) => return self.parse_place_inner(args[0]),
_ => (*arg, PlaceElem::Deref),
)
},
ExprKind::Index { lhs, index } => (*lhs, PlaceElem::Index(self.parse_local(*index)?)),
ExprKind::Field { lhs, name: field, .. } => (*lhs, PlaceElem::Field(*field, expr.ty)),
_ => {
let place = self.parse_local(expr_id).map(Place::from)?;
return Ok((place, PlaceTy::from_ty(expr.ty)))
},
);
let (parent, ty) = self.parse_place_inner(parent)?;
let place = parent.project_deeper(&[proj], self.tcx);
let ty = ty.projection_ty(self.tcx, proj);
Ok((place, ty))
}
fn parse_local(&self, expr_id: ExprId) -> PResult<Local> {
parse_by_kind!(self, expr_id, _, "local",
ExprKind::VarRef { id } => Ok(self.local_map[id]),
)
}
fn parse_block(&self, expr_id: ExprId) -> PResult<BasicBlock> {
parse_by_kind!(self, expr_id, _, "basic block",
ExprKind::VarRef { id } => Ok(self.block_map[id]),
)
}
fn parse_static(&self, expr_id: ExprId) -> PResult<Operand<'tcx>> {
let expr_id = parse_by_kind!(self, expr_id, _, "static",
ExprKind::Deref { arg } => *arg,
);
parse_by_kind!(self, expr_id, expr, "static",
ExprKind::StaticRef { alloc_id, ty, .. } => {
let const_val =
ConstValue::Scalar(Scalar::from_pointer((*alloc_id).into(), &self.tcx));
let literal = ConstantKind::Val(const_val, *ty);
Ok(Operand::Constant(Box::new(Constant {
span: expr.span,
user_ty: None,
literal
})))
},
)
}
fn parse_integer_literal(&self, expr_id: ExprId) -> PResult<u128> {
parse_by_kind!(self, expr_id, expr, "constant",
ExprKind::Literal { .. }
| ExprKind::NamedConst { .. }
| ExprKind::NonHirLiteral { .. }
| ExprKind::ConstBlock { .. } => Ok({
let value = as_constant_inner(expr, |_| None, self.tcx);
value.literal.eval_bits(self.tcx, self.param_env, value.ty())
}),
)
}
}