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encoder_high.rs
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// © 2022, ETH Zurich
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
use crate::encoder::{
encoder::SubstMap,
errors::SpannedEncodingResult,
mir::{
pure::{specifications::utils::extract_closure_from_ty, PureFunctionEncoderInterface},
types::MirTypeEncoderInterface,
},
mir_encoder::{MirEncoder, PlaceEncoder},
Encoder,
};
use prusti_common::config;
use rustc_hir::def_id::DefId;
use rustc_middle::ty;
use rustc_span::Span;
use vir_crate::{
common::expression::{BinaryOperationHelpers, ExpressionIterator, QuantifierHelpers},
high::{Expression, FieldDecl, Trigger, VariableDecl},
};
fn inline_closure_high<'tcx>(
_encoder: &Encoder<'_, 'tcx>,
_def_id: DefId,
_cl_expr: Expression,
_args: Vec<VariableDecl>,
_parent_def_id: DefId,
_substs_map: &SubstMap<'tcx>,
) -> SpannedEncodingResult<Expression> {
todo!()
}
#[allow(clippy::unnecessary_unwrap)]
pub(super) fn inline_spec_item_high<'tcx>(
encoder: &Encoder<'_, 'tcx>,
def_id: DefId,
target_args: &[Expression],
target_return: Option<&Expression>,
targets_are_values: bool,
parent_def_id: DefId,
tymap: &SubstMap<'tcx>,
) -> SpannedEncodingResult<Expression> {
let mir = encoder.env().local_mir(def_id.expect_local());
assert_eq!(
mir.arg_count,
target_args.len() + if target_return.is_some() { 1 } else { 0 }
);
let mir_encoder = MirEncoder::new(encoder, &mir, def_id);
let mut body_replacements = vec![];
for (arg_idx, arg_local) in mir.args_iter().enumerate() {
let local = mir_encoder.encode_local_high(arg_local).unwrap();
body_replacements.push((
if targets_are_values {
todo!("value_expr_high ?")
//let local_ty = mir.local_decls[arg_local].ty;
//let local_span = mir_encoder.get_local_span(arg_local);
//encoder.encode_value_expr_high(
// Expression::local_no_pos(local),
// local_ty,
//).with_span(local_span)?
} else {
Expression::local_no_pos(local)
},
if target_return.is_some() && arg_idx == mir.arg_count - 1 {
target_return.unwrap().clone()
} else {
target_args[arg_idx].clone()
},
));
}
Ok(encoder
.encode_pure_expression_high(def_id, parent_def_id, tymap)?
.replace_multiple_places(&body_replacements))
}
pub(super) fn encode_quantifier_high<'tcx>(
encoder: &Encoder<'_, 'tcx>,
_span: Span, // TODO: use span somehow? or remove arg
substs: ty::subst::SubstsRef<'tcx>,
encoded_args: Vec<Expression>,
is_exists: bool,
parent_def_id: DefId,
tymap: &SubstMap<'tcx>,
) -> SpannedEncodingResult<Expression> {
let tcx = encoder.env().tcx();
// Quantifiers are encoded as:
// forall(
// (
// ( // trigger set 1
// |qvars...| { <trigger expr 1> },
// |qvars...| { <trigger expr 2> },
// ),
// ...,
// ),
// |qvars...| -> bool { <body expr> },
// )
let cl_type_body = substs.type_at(1);
let (body_def_id, _, args, _) = extract_closure_from_ty(tcx, cl_type_body);
let mut encoded_qvars = vec![];
let mut bounds = vec![];
for (arg_idx, arg_ty) in args.iter().enumerate() {
let qvar_ty = encoder.encode_type_high(arg_ty).unwrap();
let qvar_name = format!("_{}_quant_{}", arg_idx, body_def_id.index.index());
let encoded_qvar = VariableDecl::new(qvar_name, qvar_ty);
if config::check_overflows() {
bounds.extend(encoder.encode_type_bounds_high(&encoded_qvar.clone().into(), arg_ty));
} else if config::encode_unsigned_num_constraint() {
if let ty::TyKind::Uint(_) = arg_ty.kind() {
let expr = Expression::less_equals(0u32.into(), encoded_qvar.clone().into());
bounds.push(expr);
}
}
encoded_qvars.push(encoded_qvar);
}
// TODO: implement trigger and trigger set checks
let mut encoded_trigger_sets = vec![];
for (trigger_set_idx, ty_trigger_set) in substs.type_at(0).tuple_fields().enumerate() {
let mut encoded_triggers = vec![];
for (trigger_idx, ty_trigger) in ty_trigger_set.tuple_fields().enumerate() {
let (trigger_def_id, _, _, _) = extract_closure_from_ty(tcx, ty_trigger);
let set_field = FieldDecl::new(
format!("tuple_{}", trigger_set_idx),
encoder.encode_type_high(ty_trigger_set)?,
);
let trigger_field = FieldDecl::new(
format!("tuple_{}", trigger_idx),
encoder.encode_type_high(ty_trigger)?,
);
encoded_triggers.push(inline_closure_high(
encoder,
trigger_def_id,
Expression::field_no_pos(
Expression::field_no_pos(encoded_args[0].clone(), set_field),
trigger_field,
),
encoded_qvars.clone(),
parent_def_id,
tymap,
)?);
}
encoded_trigger_sets.push(Trigger::new(encoded_triggers));
}
let encoded_body = inline_closure_high(
encoder,
body_def_id,
encoded_args[1].clone(),
encoded_qvars.clone(),
parent_def_id,
tymap,
)?;
// TODO: implement cache-friendly qvar renaming
let final_body = if bounds.is_empty() {
encoded_body
} else if is_exists {
Expression::and(bounds.into_iter().conjoin(), encoded_body)
} else {
Expression::implies(bounds.into_iter().conjoin(), encoded_body)
};
if is_exists {
Ok(Expression::exists(
encoded_qvars,
encoded_trigger_sets,
final_body,
))
} else {
Ok(Expression::forall(
encoded_qvars,
encoded_trigger_sets,
final_body,
))
}
}