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feat: partial code generation for multiple targets (#1114)
Closes partially #1079 ### Summary of Changes Partial code generation now works for multiple targets instead of just one.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| import { SafeDsServices } from '../safe-ds-module.js'; | ||
| import { isSdsAssignment, isSdsPlaceholder, isSdsReference, SdsPlaceholder, SdsStatement } from '../generated/ast.js'; | ||
| import { AstUtils, Stream } from 'langium'; | ||
| import { ImpurityReason } from '../purity/model.js'; | ||
| import { getAssignees } from '../helpers/nodeProperties.js'; | ||
| import { SafeDsPurityComputer } from '../purity/safe-ds-purity-computer.js'; | ||
|
|
||
| export class SafeDsSlicer { | ||
| private readonly purityComputer: SafeDsPurityComputer; | ||
|
|
||
| constructor(services: SafeDsServices) { | ||
| this.purityComputer = services.purity.PurityComputer; | ||
| } | ||
|
|
||
| /** | ||
| * Computes the subset of the given statements that are needed to calculate the target placeholders. | ||
| */ | ||
| computeBackwardSlice(statements: SdsStatement[], targets: SdsPlaceholder[]): SdsStatement[] { | ||
| const aggregator = new BackwardSliceAggregator(this.purityComputer, targets); | ||
|
|
||
| for (const statement of statements.reverse()) { | ||
| // Keep if it declares a target | ||
| if ( | ||
| isSdsAssignment(statement) && | ||
| getAssignees(statement).some((it) => isSdsPlaceholder(it) && aggregator.targets.has(it)) | ||
| ) { | ||
| aggregator.addStatement(statement); | ||
| } | ||
|
|
||
| // Keep if it has an impurity reason that affects a future impurity reason | ||
| else if ( | ||
| this.purityComputer | ||
| .getImpurityReasonsForStatement(statement) | ||
| .some((pastReason) => | ||
| aggregator.impurityReasons.some((futureReason) => | ||
| pastReason.canAffectFutureImpurityReason(futureReason), | ||
| ), | ||
| ) | ||
| ) { | ||
| aggregator.addStatement(statement); | ||
| } | ||
| } | ||
|
|
||
| return aggregator.statements; | ||
| } | ||
| } | ||
|
|
||
| class BackwardSliceAggregator { | ||
| private readonly purityComputer: SafeDsPurityComputer; | ||
|
|
||
| /** | ||
| * The statements that are needed to calculate the target placeholders. | ||
| */ | ||
| readonly statements: SdsStatement[] = []; | ||
|
|
||
| /** | ||
| * The target placeholders that should be calculated. | ||
| */ | ||
| readonly targets: Set<SdsPlaceholder>; | ||
|
|
||
| /** | ||
| * The impurity reasons of the collected statements. | ||
| */ | ||
| readonly impurityReasons: ImpurityReason[] = []; | ||
|
|
||
| constructor(purityComputer: SafeDsPurityComputer, initialTargets: SdsPlaceholder[]) { | ||
| this.purityComputer = purityComputer; | ||
|
|
||
| this.targets = new Set(initialTargets); | ||
| } | ||
|
|
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| addStatement(statement: SdsStatement): void { | ||
| this.statements.unshift(statement); | ||
|
|
||
| // Remember all referenced placeholders | ||
| this.getReferencedPlaceholders(statement).forEach((it) => { | ||
| this.targets.add(it); | ||
| }); | ||
|
|
||
| // Remember all impurity reasons | ||
| this.purityComputer.getImpurityReasonsForStatement(statement).forEach((it) => { | ||
| this.impurityReasons.push(it); | ||
| }); | ||
| } | ||
|
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||
| private getReferencedPlaceholders(node: SdsStatement): Stream<SdsPlaceholder> { | ||
| return AstUtils.streamAllContents(node).flatMap((it) => { | ||
| if (isSdsReference(it) && isSdsPlaceholder(it.target.ref)) { | ||
| return [it.target.ref]; | ||
| } else { | ||
| return []; | ||
| } | ||
| }); | ||
| } | ||
| } |
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