cairo_lang_semantic/
substitution.rs

1use std::collections::VecDeque;
2use std::hash::Hash;
3use std::ops::{Deref, DerefMut};
4
5use cairo_lang_defs::ids::{
6    EnumId, ExternFunctionId, ExternTypeId, FreeFunctionId, GenericParamId, ImplAliasId, ImplDefId,
7    ImplFunctionId, ImplImplDefId, LanguageElementId, LocalVarId, MemberId, ParamId, StructId,
8    TraitConstantId, TraitFunctionId, TraitId, TraitImplId, TraitTypeId, VariantId,
9};
10use cairo_lang_diagnostics::{DiagnosticAdded, Maybe};
11use cairo_lang_utils::ordered_hash_map::OrderedHashMap;
12use cairo_lang_utils::{LookupIntern, extract_matches};
13use itertools::zip_eq;
14
15use crate::db::SemanticGroup;
16use crate::expr::inference::canonic::CanonicalTrait;
17use crate::expr::inference::{
18    ConstVar, ImplVar, ImplVarId, ImplVarTraitItemMappings, InferenceId, InferenceVar,
19    LocalConstVarId, LocalImplVarId, LocalTypeVarId, TypeVar,
20};
21use crate::items::constant::{ConstValue, ConstValueId, ImplConstantId};
22use crate::items::functions::{
23    ConcreteFunctionWithBody, ConcreteFunctionWithBodyId, GenericFunctionId,
24    GenericFunctionWithBodyId, ImplFunctionBodyId, ImplGenericFunctionId,
25    ImplGenericFunctionWithBodyId,
26};
27use crate::items::generics::{GenericParamConst, GenericParamImpl, GenericParamType};
28use crate::items::imp::{
29    GeneratedImplId, GeneratedImplItems, GeneratedImplLongId, ImplId, ImplImplId, ImplLongId,
30    UninferredGeneratedImplId, UninferredGeneratedImplLongId, UninferredImpl,
31};
32use crate::items::trt::{
33    ConcreteTraitGenericFunctionId, ConcreteTraitGenericFunctionLongId, ConcreteTraitTypeId,
34    ConcreteTraitTypeLongId,
35};
36use crate::types::{
37    ClosureTypeLongId, ConcreteEnumLongId, ConcreteExternTypeLongId, ConcreteStructLongId,
38    ImplTypeId,
39};
40use crate::{
41    ConcreteEnumId, ConcreteExternTypeId, ConcreteFunction, ConcreteImplId, ConcreteImplLongId,
42    ConcreteStructId, ConcreteTraitId, ConcreteTraitLongId, ConcreteTypeId, ConcreteVariant,
43    ExprId, ExprVar, ExprVarMemberPath, FunctionId, FunctionLongId, GenericArgumentId,
44    GenericParam, MatchArmSelector, Parameter, Signature, TypeId, TypeLongId, ValueSelectorArm,
45    VarId,
46};
47
48pub enum RewriteResult {
49    Modified,
50    NoChange,
51}
52
53/// A substitution of generic arguments in generic parameters as well as the `Self` of traits. Used
54/// for concretization.
55#[derive(Clone, Debug, Default, PartialEq, Eq, Hash)]
56pub struct GenericSubstitution {
57    param_to_arg: OrderedHashMap<GenericParamId, GenericArgumentId>,
58    self_impl: Option<ImplId>,
59}
60impl GenericSubstitution {
61    pub fn from_impl(self_impl: ImplId) -> Self {
62        GenericSubstitution { param_to_arg: OrderedHashMap::default(), self_impl: Some(self_impl) }
63    }
64    pub fn new(generic_params: &[GenericParam], generic_args: &[GenericArgumentId]) -> Self {
65        GenericSubstitution {
66            param_to_arg: zip_eq(generic_params, generic_args)
67                .map(|(param, arg)| (param.id(), *arg))
68                .collect(),
69            self_impl: None,
70        }
71    }
72    pub fn concat(mut self, other: GenericSubstitution) -> Self {
73        for (key, value) in other.param_to_arg {
74            self.param_to_arg.insert(key, value);
75        }
76        if let Some(self_impl) = other.self_impl {
77            self.self_impl = Some(self_impl);
78        }
79        self
80    }
81    /// Returns whether the substitution is empty.
82    pub fn is_empty(&self) -> bool {
83        self.param_to_arg.is_empty() && self.self_impl.is_none()
84    }
85    pub fn substitute<'a, Obj>(&'a self, db: &'a dyn SemanticGroup, obj: Obj) -> Maybe<Obj>
86    where
87        SubstitutionRewriter<'a>: SemanticRewriter<Obj, DiagnosticAdded>,
88    {
89        SubstitutionRewriter { db, substitution: self }.rewrite(obj)
90    }
91}
92impl Deref for GenericSubstitution {
93    type Target = OrderedHashMap<GenericParamId, GenericArgumentId>;
94
95    fn deref(&self) -> &Self::Target {
96        &self.param_to_arg
97    }
98}
99impl DerefMut for GenericSubstitution {
100    fn deref_mut(&mut self) -> &mut Self::Target {
101        &mut self.param_to_arg
102    }
103}
104
105#[macro_export]
106macro_rules! semantic_object_for_id {
107    ($name:ident, $lookup:ident, $intern:ident, $long_ty:ident) => {
108        impl<
109            'a,
110            Error,
111            TRewriter: $crate::substitution::HasDb<&'a dyn $crate::db::SemanticGroup>
112                + $crate::substitution::SemanticRewriter<$long_ty, Error>,
113        > $crate::substitution::SemanticObject<TRewriter, Error> for $name
114        {
115            fn default_rewrite(
116                &mut self,
117                rewriter: &mut TRewriter,
118            ) -> Result<$crate::substitution::RewriteResult, Error> where {
119                let db = $crate::substitution::HasDb::get_db(rewriter);
120                let mut val = db.$lookup(*self);
121                Ok(
122                    match $crate::substitution::SemanticRewriter::internal_rewrite(
123                        rewriter, &mut val,
124                    )? {
125                        $crate::substitution::RewriteResult::Modified => {
126                            *self = db.$intern(val);
127                            $crate::substitution::RewriteResult::Modified
128                        }
129                        $crate::substitution::RewriteResult::NoChange => {
130                            $crate::substitution::RewriteResult::NoChange
131                        }
132                    },
133                )
134            }
135        }
136    };
137}
138
139#[macro_export]
140macro_rules! add_rewrite {
141    (<$($generics:lifetime),*>, $self_ty:ty, $err_ty:ty, $ty:ident) => {
142        impl <$($generics),*> SemanticRewriter<$ty, $err_ty> for $self_ty {
143            fn internal_rewrite(
144                &mut self,
145                value: &mut $ty
146            ) -> Result<$crate::substitution::RewriteResult, $err_ty> {
147                $crate::substitution::SemanticObject::default_rewrite(value, self)
148            }
149        }
150    };
151}
152
153#[macro_export]
154macro_rules! add_rewrite_identity {
155    (<$($generics:lifetime),*>, $self_ty:ty, $err_ty:ty, $ty:ident) => {
156        impl <$($generics),*> SemanticRewriter<$ty, $err_ty> for $self_ty {
157            fn internal_rewrite(
158                &mut self,
159                _value: &mut $ty
160            ) -> Result<$crate::substitution::RewriteResult, $err_ty> {
161                Ok(RewriteResult::NoChange)
162            }
163        }
164    };
165}
166
167pub trait SemanticObject<TRewriter, Error>: Sized {
168    fn default_rewrite(&mut self, rewriter: &mut TRewriter) -> Result<RewriteResult, Error>;
169}
170impl<T: Clone, E, TRewriter: SemanticRewriter<T, E>> SemanticRewriter<Vec<T>, E> for TRewriter {
171    fn internal_rewrite(&mut self, value: &mut Vec<T>) -> Result<RewriteResult, E> {
172        let mut result = RewriteResult::NoChange;
173        for el in value.iter_mut() {
174            match self.internal_rewrite(el)? {
175                RewriteResult::Modified => {
176                    result = RewriteResult::Modified;
177                }
178                RewriteResult::NoChange => {}
179            }
180        }
181
182        Ok(result)
183    }
184}
185impl<T, E, TRewriter: SemanticRewriter<T, E>> SemanticRewriter<VecDeque<T>, E> for TRewriter {
186    fn internal_rewrite(&mut self, value: &mut VecDeque<T>) -> Result<RewriteResult, E> {
187        let mut result = RewriteResult::NoChange;
188        for el in value.iter_mut() {
189            match self.internal_rewrite(el)? {
190                RewriteResult::Modified => {
191                    result = RewriteResult::Modified;
192                }
193                RewriteResult::NoChange => {}
194            }
195        }
196
197        Ok(result)
198    }
199}
200impl<T, E, TRewriter: SemanticRewriter<T, E>> SemanticRewriter<Box<T>, E> for TRewriter {
201    fn internal_rewrite(&mut self, value: &mut Box<T>) -> Result<RewriteResult, E> {
202        self.internal_rewrite(value.as_mut())
203    }
204}
205
206impl<K: Hash + Eq + LanguageElementId, V: Clone, E, TRewriter: SemanticRewriter<V, E>>
207    SemanticRewriter<OrderedHashMap<K, V>, E> for TRewriter
208{
209    fn internal_rewrite(&mut self, value: &mut OrderedHashMap<K, V>) -> Result<RewriteResult, E> {
210        let mut result = RewriteResult::NoChange;
211        for (_, v) in value.iter_mut() {
212            match self.internal_rewrite(v)? {
213                RewriteResult::Modified => {
214                    result = RewriteResult::Modified;
215                }
216                RewriteResult::NoChange => {}
217            }
218        }
219        Ok(result)
220    }
221}
222impl<T0, T1, E, TRewriter: SemanticRewriter<T0, E> + SemanticRewriter<T1, E>>
223    SemanticRewriter<(T0, T1), E> for TRewriter
224{
225    fn internal_rewrite(&mut self, value: &mut (T0, T1)) -> Result<RewriteResult, E> {
226        match (self.internal_rewrite(&mut value.0)?, self.internal_rewrite(&mut value.1)?) {
227            (RewriteResult::NoChange, RewriteResult::NoChange) => Ok(RewriteResult::NoChange),
228            _ => Ok(RewriteResult::Modified),
229        }
230    }
231}
232impl<T, E, TRewriter: SemanticRewriter<T, E>> SemanticRewriter<Option<T>, E> for TRewriter {
233    fn internal_rewrite(&mut self, value: &mut Option<T>) -> Result<RewriteResult, E> {
234        Ok(match value {
235            Some(val) => self.internal_rewrite(val)?,
236            None => RewriteResult::NoChange,
237        })
238    }
239}
240impl<T, E, TRewriter: SemanticRewriter<T, E>, E2> SemanticRewriter<Result<T, E2>, E> for TRewriter {
241    fn internal_rewrite(&mut self, value: &mut Result<T, E2>) -> Result<RewriteResult, E> {
242        Ok(match value {
243            Ok(val) => self.internal_rewrite(val)?,
244            Err(_) => RewriteResult::NoChange,
245        })
246    }
247}
248pub trait HasDb<T> {
249    fn get_db(&self) -> T;
250}
251pub trait SemanticRewriter<T, Error> {
252    fn rewrite(&mut self, mut value: T) -> Result<T, Error> {
253        self.internal_rewrite(&mut value)?;
254        Ok(value)
255    }
256
257    fn internal_rewrite(&mut self, value: &mut T) -> Result<RewriteResult, Error>;
258}
259
260#[macro_export]
261macro_rules! prune_single {
262    ($macro:ident, $item:ident, ) => {$macro!($item);};
263    ($macro:ident, $item:ident, $item0:ident $($item_rest:ident)*) => {
264        macro_rules! __inner_helper {
265            // Identifiers equal, skip.
266            ($item $item) => { };
267            // Identifiers not equal, continue scanning.
268            ($item $item0) => { $crate::prune_single!($macro, $item, $($item_rest)*); };
269        }
270        __inner_helper!($item $item0);
271    }
272}
273
274#[macro_export]
275macro_rules! add_basic_rewrites {
276    (<$($generics:lifetime),*>, $self_ty:ty, $err_ty:ty, @exclude $($exclude:ident)*) => {
277        macro_rules! __identity_helper {
278            ($item:ident) => {
279                $crate::add_rewrite_identity!(<$($generics),*>, $self_ty, $err_ty, $item);
280            }
281        }
282        macro_rules! __regular_helper {
283            ($item:ident) => { $crate::add_rewrite!(<$($generics),*>, $self_ty, $err_ty, $item); }
284        }
285
286        $crate::prune_single!(__identity_helper, InferenceId, $($exclude)*);
287        $crate::prune_single!(__identity_helper, ParamId, $($exclude)*);
288        $crate::prune_single!(__identity_helper, FreeFunctionId, $($exclude)*);
289        $crate::prune_single!(__identity_helper, ExternFunctionId, $($exclude)*);
290        $crate::prune_single!(__identity_helper, ExternTypeId, $($exclude)*);
291        $crate::prune_single!(__identity_helper, ImplDefId, $($exclude)*);
292        $crate::prune_single!(__identity_helper, ImplImplDefId, $($exclude)*);
293        $crate::prune_single!(__identity_helper, ImplAliasId, $($exclude)*);
294        $crate::prune_single!(__identity_helper, TraitId, $($exclude)*);
295        $crate::prune_single!(__identity_helper, TraitFunctionId, $($exclude)*);
296        $crate::prune_single!(__identity_helper, VariantId, $($exclude)*);
297        $crate::prune_single!(__identity_helper, ImplFunctionId, $($exclude)*);
298        $crate::prune_single!(__identity_helper, EnumId, $($exclude)*);
299        $crate::prune_single!(__identity_helper, StructId, $($exclude)*);
300        $crate::prune_single!(__identity_helper, GenericParamId, $($exclude)*);
301        $crate::prune_single!(__identity_helper, TraitTypeId, $($exclude)*);
302        $crate::prune_single!(__identity_helper, TraitImplId, $($exclude)*);
303        $crate::prune_single!(__identity_helper, TraitConstantId, $($exclude)*);
304        $crate::prune_single!(__identity_helper, TypeVar, $($exclude)*);
305        $crate::prune_single!(__identity_helper, ConstVar, $($exclude)*);
306        $crate::prune_single!(__identity_helper, VarId, $($exclude)*);
307        $crate::prune_single!(__identity_helper, MemberId, $($exclude)*);
308        $crate::prune_single!(__identity_helper, LocalVarId, $($exclude)*);
309        $crate::prune_single!(__identity_helper, LocalImplVarId, $($exclude)*);
310        $crate::prune_single!(__identity_helper, LocalTypeVarId, $($exclude)*);
311        $crate::prune_single!(__identity_helper, LocalConstVarId, $($exclude)*);
312        $crate::prune_single!(__identity_helper, InferenceVar, $($exclude)*);
313        $crate::prune_single!(__identity_helper, ImplFunctionBodyId, $($exclude)*);
314        $crate::prune_single!(__identity_helper, ExprId, $($exclude)*);
315
316        $crate::prune_single!(__regular_helper, Signature, $($exclude)*);
317        $crate::prune_single!(__regular_helper, GenericFunctionId, $($exclude)*);
318        $crate::prune_single!(__regular_helper, GenericFunctionWithBodyId, $($exclude)*);
319        $crate::prune_single!(__regular_helper, ConcreteFunction, $($exclude)*);
320        $crate::prune_single!(__regular_helper, ConcreteFunctionWithBody, $($exclude)*);
321        $crate::prune_single!(__regular_helper, ConcreteFunctionWithBodyId, $($exclude)*);
322        $crate::prune_single!(__regular_helper, ImplGenericFunctionId, $($exclude)*);
323        $crate::prune_single!(__regular_helper, ImplGenericFunctionWithBodyId, $($exclude)*);
324        $crate::prune_single!(__regular_helper, ImplVar, $($exclude)*);
325        $crate::prune_single!(__regular_helper, ImplVarId, $($exclude)*);
326        $crate::prune_single!(__regular_helper, Parameter, $($exclude)*);
327        $crate::prune_single!(__regular_helper, GenericParam, $($exclude)*);
328        $crate::prune_single!(__regular_helper, GenericParamType, $($exclude)*);
329        $crate::prune_single!(__regular_helper, GenericParamConst, $($exclude)*);
330        $crate::prune_single!(__regular_helper, GenericParamImpl, $($exclude)*);
331        $crate::prune_single!(__regular_helper, GenericArgumentId, $($exclude)*);
332        $crate::prune_single!(__regular_helper, FunctionId, $($exclude)*);
333        $crate::prune_single!(__regular_helper, FunctionLongId, $($exclude)*);
334        $crate::prune_single!(__regular_helper, TypeId, $($exclude)*);
335        $crate::prune_single!(__regular_helper, TypeLongId, $($exclude)*);
336        $crate::prune_single!(__regular_helper, ConstValueId, $($exclude)*);
337        $crate::prune_single!(__regular_helper, ConstValue, $($exclude)*);
338        $crate::prune_single!(__regular_helper, ConcreteVariant, $($exclude)*);
339        $crate::prune_single!(__regular_helper, ValueSelectorArm, $($exclude)*);
340        $crate::prune_single!(__regular_helper, MatchArmSelector, $($exclude)*);
341        $crate::prune_single!(__regular_helper, ClosureTypeLongId, $($exclude)*);
342        $crate::prune_single!(__regular_helper, ConcreteTypeId, $($exclude)*);
343        $crate::prune_single!(__regular_helper, ConcreteStructId, $($exclude)*);
344        $crate::prune_single!(__regular_helper, ConcreteStructLongId, $($exclude)*);
345        $crate::prune_single!(__regular_helper, ConcreteEnumId, $($exclude)*);
346        $crate::prune_single!(__regular_helper, ConcreteEnumLongId, $($exclude)*);
347        $crate::prune_single!(__regular_helper, ConcreteExternTypeId, $($exclude)*);
348        $crate::prune_single!(__regular_helper, ConcreteExternTypeLongId, $($exclude)*);
349        $crate::prune_single!(__regular_helper, ConcreteTraitId, $($exclude)*);
350        $crate::prune_single!(__regular_helper, ConcreteTraitLongId, $($exclude)*);
351        $crate::prune_single!(__regular_helper, ConcreteTraitTypeId, $($exclude)*);
352        $crate::prune_single!(__regular_helper, ConcreteTraitTypeLongId, $($exclude)*);
353        $crate::prune_single!(__regular_helper, ConcreteImplId, $($exclude)*);
354        $crate::prune_single!(__regular_helper, ConcreteImplLongId, $($exclude)*);
355        $crate::prune_single!(__regular_helper, ConcreteTraitGenericFunctionLongId, $($exclude)*);
356        $crate::prune_single!(__regular_helper, ConcreteTraitGenericFunctionId, $($exclude)*);
357        $crate::prune_single!(__regular_helper, GeneratedImplId, $($exclude)*);
358        $crate::prune_single!(__regular_helper, GeneratedImplLongId, $($exclude)*);
359        $crate::prune_single!(__regular_helper, GeneratedImplItems, $($exclude)*);
360        $crate::prune_single!(__regular_helper, ImplLongId, $($exclude)*);
361        $crate::prune_single!(__regular_helper, ImplId, $($exclude)*);
362        $crate::prune_single!(__regular_helper, ImplTypeId, $($exclude)*);
363        $crate::prune_single!(__regular_helper, ImplConstantId, $($exclude)*);
364        $crate::prune_single!(__regular_helper, ImplImplId, $($exclude)*);
365        $crate::prune_single!(__regular_helper, UninferredGeneratedImplId, $($exclude)*);
366        $crate::prune_single!(__regular_helper, UninferredGeneratedImplLongId, $($exclude)*);
367        $crate::prune_single!(__regular_helper, UninferredImpl, $($exclude)*);
368        $crate::prune_single!(__regular_helper, ExprVarMemberPath, $($exclude)*);
369        $crate::prune_single!(__regular_helper, ExprVar, $($exclude)*);
370        $crate::prune_single!(__regular_helper, ImplVarTraitItemMappings, $($exclude)*);
371        $crate::prune_single!(__regular_helper, CanonicalTrait, $($exclude)*);
372    };
373}
374
375#[macro_export]
376macro_rules! add_expr_rewrites {
377    (<$($generics:lifetime),*>, $self_ty:ty, $err_ty:ty, @exclude $($exclude:ident)*) => {
378        macro_rules! __identity_helper {
379            ($item:ident) => {
380                 $crate::add_rewrite_identity!(<$($generics),*>, $self_ty, $err_ty, $item);
381            }
382        }
383        macro_rules! __regular_helper {
384            ($item:ident) => { $crate::add_rewrite!(<$($generics),*>, $self_ty, $err_ty, $item); }
385        }
386
387        $crate::prune_single!(__identity_helper, PatternId, $($exclude)*);
388        $crate::prune_single!(__identity_helper, StatementId, $($exclude)*);
389        $crate::prune_single!(__identity_helper, ConstantId, $($exclude)*);
390
391        $crate::prune_single!(__regular_helper, Expr, $($exclude)*);
392        $crate::prune_single!(__regular_helper, ExprTuple, $($exclude)*);
393        $crate::prune_single!(__regular_helper, ExprSnapshot, $($exclude)*);
394        $crate::prune_single!(__regular_helper, ExprDesnap, $($exclude)*);
395        $crate::prune_single!(__regular_helper, ExprAssignment, $($exclude)*);
396        $crate::prune_single!(__regular_helper, ExprLogicalOperator, $($exclude)*);
397        $crate::prune_single!(__regular_helper, ExprBlock, $($exclude)*);
398        $crate::prune_single!(__regular_helper, ExprFunctionCall, $($exclude)*);
399        $crate::prune_single!(__regular_helper, ExprMatch, $($exclude)*);
400        $crate::prune_single!(__regular_helper, ExprIf, $($exclude)*);
401        $crate::prune_single!(__regular_helper, Condition, $($exclude)*);
402        $crate::prune_single!(__regular_helper, ExprLoop, $($exclude)*);
403        $crate::prune_single!(__regular_helper, ExprWhile, $($exclude)*);
404        $crate::prune_single!(__regular_helper, ExprFor, $($exclude)*);
405        $crate::prune_single!(__regular_helper, ExprLiteral, $($exclude)*);
406        $crate::prune_single!(__regular_helper, ExprStringLiteral, $($exclude)*);
407        $crate::prune_single!(__regular_helper, ExprMemberAccess, $($exclude)*);
408        $crate::prune_single!(__regular_helper, ExprStructCtor, $($exclude)*);
409        $crate::prune_single!(__regular_helper, ExprEnumVariantCtor, $($exclude)*);
410        $crate::prune_single!(__regular_helper, ExprPropagateError, $($exclude)*);
411        $crate::prune_single!(__regular_helper, ExprConstant, $($exclude)*);
412        $crate::prune_single!(__regular_helper, ExprFixedSizeArray, $($exclude)*);
413        $crate::prune_single!(__regular_helper, ExprClosure, $($exclude)*);
414        $crate::prune_single!(__regular_helper, ExprMissing, $($exclude)*);
415        $crate::prune_single!(__regular_helper, ExprFunctionCallArg, $($exclude)*);
416        $crate::prune_single!(__regular_helper, FixedSizeArrayItems, $($exclude)*);
417        $crate::prune_single!(__regular_helper, MatchArm, $($exclude)*);
418        $crate::prune_single!(__regular_helper, Statement, $($exclude)*);
419        $crate::prune_single!(__regular_helper, StatementExpr, $($exclude)*);
420        $crate::prune_single!(__regular_helper, StatementLet, $($exclude)*);
421        $crate::prune_single!(__regular_helper, StatementReturn, $($exclude)*);
422        $crate::prune_single!(__regular_helper, StatementContinue, $($exclude)*);
423        $crate::prune_single!(__regular_helper, StatementBreak, $($exclude)*);
424        $crate::prune_single!(__regular_helper, StatementItem, $($exclude)*);
425        $crate::prune_single!(__regular_helper, Pattern, $($exclude)*);
426        $crate::prune_single!(__regular_helper, PatternLiteral, $($exclude)*);
427        $crate::prune_single!(__regular_helper, PatternStringLiteral, $($exclude)*);
428        $crate::prune_single!(__regular_helper, PatternVariable, $($exclude)*);
429        $crate::prune_single!(__regular_helper, PatternStruct, $($exclude)*);
430        $crate::prune_single!(__regular_helper, PatternTuple, $($exclude)*);
431        $crate::prune_single!(__regular_helper, PatternFixedSizeArray, $($exclude)*);
432        $crate::prune_single!(__regular_helper, PatternEnumVariant, $($exclude)*);
433        $crate::prune_single!(__regular_helper, PatternOtherwise, $($exclude)*);
434        $crate::prune_single!(__regular_helper, PatternMissing, $($exclude)*);
435        $crate::prune_single!(__regular_helper, LocalVariable, $($exclude)*);
436        $crate::prune_single!(__regular_helper, Member, $($exclude)*);
437    };
438}
439
440pub struct SubstitutionRewriter<'a> {
441    db: &'a dyn SemanticGroup,
442    substitution: &'a GenericSubstitution,
443}
444impl<'a> HasDb<&'a dyn SemanticGroup> for SubstitutionRewriter<'a> {
445    fn get_db(&self) -> &'a dyn SemanticGroup {
446        self.db
447    }
448}
449
450add_basic_rewrites!(
451    <'a>,
452    SubstitutionRewriter<'a>,
453    DiagnosticAdded,
454    @exclude TypeId TypeLongId ImplId ImplLongId ConstValue GenericFunctionWithBodyId
455);
456
457impl SemanticRewriter<TypeId, DiagnosticAdded> for SubstitutionRewriter<'_> {
458    fn internal_rewrite(&mut self, value: &mut TypeId) -> Maybe<RewriteResult> {
459        if value.is_fully_concrete(self.db) {
460            return Ok(RewriteResult::NoChange);
461        }
462        value.default_rewrite(self)
463    }
464}
465
466impl SemanticRewriter<ImplId, DiagnosticAdded> for SubstitutionRewriter<'_> {
467    fn internal_rewrite(&mut self, value: &mut ImplId) -> Maybe<RewriteResult> {
468        if value.is_fully_concrete(self.db) {
469            return Ok(RewriteResult::NoChange);
470        }
471        value.default_rewrite(self)
472    }
473}
474
475impl SemanticRewriter<TypeLongId, DiagnosticAdded> for SubstitutionRewriter<'_> {
476    fn internal_rewrite(&mut self, value: &mut TypeLongId) -> Maybe<RewriteResult> {
477        match value {
478            TypeLongId::GenericParameter(generic_param) => {
479                if let Some(generic_arg) = self.substitution.get(generic_param) {
480                    let type_id = *extract_matches!(generic_arg, GenericArgumentId::Type);
481                    // return self.rewrite(type_id.lookup_intern(self.db));
482                    *value = type_id.lookup_intern(self.db);
483                    return Ok(RewriteResult::Modified);
484                }
485            }
486            TypeLongId::ImplType(impl_type_id) => {
487                let impl_type_id_rewrite_result = self.internal_rewrite(impl_type_id)?;
488                let new_value =
489                    self.db.impl_type_concrete_implized(*impl_type_id)?.lookup_intern(self.db);
490                if new_value != *value {
491                    *value = new_value;
492                    return Ok(RewriteResult::Modified);
493                } else {
494                    return Ok(impl_type_id_rewrite_result);
495                }
496            }
497            _ => {}
498        }
499        value.default_rewrite(self)
500    }
501}
502impl SemanticRewriter<ConstValue, DiagnosticAdded> for SubstitutionRewriter<'_> {
503    fn internal_rewrite(&mut self, value: &mut ConstValue) -> Maybe<RewriteResult> {
504        match value {
505            ConstValue::Generic(param_id) => {
506                if let Some(generic_arg) = self.substitution.get(param_id) {
507                    let const_value_id = extract_matches!(generic_arg, GenericArgumentId::Constant);
508
509                    *value = const_value_id.lookup_intern(self.db);
510                    return Ok(RewriteResult::Modified);
511                }
512            }
513            ConstValue::ImplConstant(impl_constant_id) => {
514                let impl_const_id_rewrite_result = self.internal_rewrite(impl_constant_id)?;
515                let new_value = self
516                    .db
517                    .impl_constant_concrete_implized_value(*impl_constant_id)?
518                    .lookup_intern(self.db);
519                if new_value != *value {
520                    *value = new_value;
521                    return Ok(RewriteResult::Modified);
522                } else {
523                    return Ok(impl_const_id_rewrite_result);
524                }
525            }
526            _ => {}
527        }
528
529        value.default_rewrite(self)
530    }
531}
532impl SemanticRewriter<ImplLongId, DiagnosticAdded> for SubstitutionRewriter<'_> {
533    fn internal_rewrite(&mut self, value: &mut ImplLongId) -> Maybe<RewriteResult> {
534        match value {
535            ImplLongId::GenericParameter(generic_param) => {
536                if let Some(generic_arg) = self.substitution.get(generic_param) {
537                    *value = extract_matches!(generic_arg, GenericArgumentId::Impl)
538                        .lookup_intern(self.db);
539                    // TODO(GIL): Reduce and check for cycles when the substitution is created.
540                    // Substitution is guaranteed to not contain its own variables.
541                    return Ok(RewriteResult::Modified);
542                }
543            }
544            ImplLongId::ImplImpl(impl_impl_id) => {
545                let impl_impl_id_rewrite_result = self.internal_rewrite(impl_impl_id)?;
546                let new_value =
547                    self.db.impl_impl_concrete_implized(*impl_impl_id)?.lookup_intern(self.db);
548                if new_value != *value {
549                    *value = new_value;
550                    return Ok(RewriteResult::Modified);
551                } else {
552                    return Ok(impl_impl_id_rewrite_result);
553                }
554            }
555            ImplLongId::SelfImpl(concrete_trait_id) => {
556                let rewrite_result = self.internal_rewrite(concrete_trait_id)?;
557                if let Some(self_impl) = &self.substitution.self_impl {
558                    if *concrete_trait_id == self_impl.concrete_trait(self.db)? {
559                        *value = self_impl.lookup_intern(self.db);
560                        return Ok(RewriteResult::Modified);
561                    }
562                } else {
563                    return Ok(rewrite_result);
564                }
565            }
566            _ => {}
567        }
568        value.default_rewrite(self)
569    }
570}
571impl SemanticRewriter<GenericFunctionWithBodyId, DiagnosticAdded> for SubstitutionRewriter<'_> {
572    fn internal_rewrite(&mut self, value: &mut GenericFunctionWithBodyId) -> Maybe<RewriteResult> {
573        if let GenericFunctionWithBodyId::Trait(id) = value {
574            if let Some(self_impl) = &self.substitution.self_impl {
575                if let ImplLongId::Concrete(concrete_impl_id) = self_impl.lookup_intern(self.db) {
576                    if self.rewrite(id.concrete_trait(self.db))?
577                        == self_impl.concrete_trait(self.db)?
578                    {
579                        *value = GenericFunctionWithBodyId::Impl(ImplGenericFunctionWithBodyId {
580                            concrete_impl_id,
581                            function_body: ImplFunctionBodyId::Trait(id.trait_function(self.db)),
582                        });
583                        return Ok(RewriteResult::Modified);
584                    }
585                }
586            }
587        }
588        value.default_rewrite(self)
589    }
590}
cairo_lang_semantic/substitution.rs

cairo_lang_semantic/
substitution.rs
