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🟡 Changes recommended
Conditional-compilation handling still drops valid synthesized initializers, mishandles name binding for flags and branch declarations, and causes false unused-variable reports.
4 open issues
What changed in this PR
This PR adds Swift conditional-compilation blocks to the Unified extractor and extends local name binding to follow declarations across compilation alternatives. Full static name-binding support remains follow-up work.
Changes:
- Represent
#if/#elseif/#elseblocks as nested conditional expressions. - Separate direct class members from compilation-expanded members and expose semantic top-level statements.
- Extend local scoping and add extraction, constructor, and control-flow coverage.
| File | Description |
|---|---|
| unified/ql/test/library-tests/local-name-binding/conditional-compilation.swift | Tests conditional bindings, shadowing, and captures. |
| unified/ql/test/library-tests/controlflow/cfg.swift | Adds conditional-compilation flow assertions. |
| unified/ql/test/library-tests/controlflow/cfg.expected | Records new control-flow results. |
| unified/ql/test/library-tests/controlflow/basicblock-slices.expected | Records conditional basic blocks. |
| unified/ql/test/library-tests/constructors/test.expected | Records conditional constructor and field results. |
| unified/ql/test/library-tests/constructors/constructors.swift | Adds conditional constructors and fields. |
| unified/ql/lib/unified.dbscheme | Updates member relations and conditional node schema. |
| unified/ql/lib/codeql/unified/internal/StaticNameBinding.qll | Uses compilation-expanded top-level statements. |
| unified/ql/lib/codeql/unified/internal/NameBindingPluginSwift.qll | Recognizes conditional top-level private declarations. |
| unified/ql/lib/codeql/unified/internal/NameBindingPlugin.qll | Expands top-level static-member classification. |
| unified/ql/lib/codeql/unified/internal/LocalNameBinding.qll | Marks compilation conditionals as unscoped. |
| unified/ql/lib/codeql/unified/internal/FacadeAst.qll | Exposes semantic statements and expanded members. |
| unified/ql/lib/codeql/unified/internal/AstExtra.qll | Expands top-level statement classification. |
| unified/ql/lib/codeql/unified/internal/Ast.qll | Updates generated AST accessors and types. |
| unified/extractor/tests/corpus/swift/variables/property-with-willset-and-didset-observers.output | Updates direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/struct.output | Updates direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/static-function.output | Updates direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/qualified-type.output | Updates nested direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/protocol-with-read-only-and-read-write-property-requirements.output | Updates protocol direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/protocol-declaration.output | Updates direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/property-with-getter-and-setter.output | Updates accessor direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/noncopyable-type.output | Updates direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/generic-class-parameters-and-constraints.output | Updates generated constructor placement. |
| unified/extractor/tests/corpus/swift/types/extension.output | Updates extension direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/enum-with-comma-separated-cases-chained-declaration.output | Updates enum direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/enum-with-cases.output | Updates enum direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/enum-with-associated-values.output | Updates enum-case constructor placement. |
| unified/extractor/tests/corpus/swift/types/empty-class.output | Updates generated constructor placement. |
| unified/extractor/tests/corpus/swift/types/constructor-with-parameters.output | Updates constructor direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/conditional-compilation-in-class-body.swift | Removes the old unsupported-block fixture. |
| unified/extractor/tests/corpus/swift/types/computed-property.output | Updates property direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/class-with-stored-properties.output | Updates direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/class-with-multiple-base-types.output | Updates generated constructor placement. |
| unified/extractor/tests/corpus/swift/types/class-with-method.output | Updates direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/class-with-initializer.output | Updates direct-member expectations. |
| unified/extractor/tests/corpus/swift/types/class-inheritance.output | Updates generated constructor placement. |
| unified/extractor/tests/corpus/swift/types/class-function.output | Updates direct-member expectations. |
| unified/extractor/tests/corpus/swift/functions/constructor-call-with-type-arguments.output | Updates generated constructor placement. |
| unified/extractor/tests/corpus/swift/expressions/super-expression.output | Updates class direct-member expectations. |
| unified/extractor/tests/corpus/swift/control-flow/discard-statement.output | Updates direct-member expectations. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-with-operators.swift | Adds compound compilation conditions. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-with-operators.output | Records condition operator extraction. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-with-elseif.swift | Adds an #elseif chain. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-with-elseif.output | Records nested conditional expressions. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-with-elseif-in-class-body.swift | Adds conditional initializer alternatives. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-with-elseif-in-class-body.output | Records conditional class members. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-postfix-expression.swift | Adds a postfix conditional fixture. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-postfix-expression.output | Records unsupported postfix extraction. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-nested.swift | Adds nested and empty compilation branches. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-nested.output | Records nested branch extraction. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-in-switch-cases.swift | Adds conditional switch cases. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-in-switch-cases.output | Records unsupported switch-case extraction. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-in-class-body.swift | Adds the relocated class-body fixture. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-in-class-body.output | Records extracted initializers and destructors. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-in-attributes.swift | Adds conditional attribute fixtures. |
| unified/extractor/tests/corpus/swift/conditional-compilation/conditional-compilation-in-attributes.output | Records current attribute extraction limitations. |
| unified/extractor/src/languages/swift/swift.rs | Lowers compilation blocks and searches conditional initializers. |
| unified/extractor/ast_types.yml | Defines conditional modifiers and direct members. |
| shared/namebinding/codeql/namebinding/LocalNameBinding.qll | Propagates shadowing declarations across unscoped alternatives. |
Review effort: Balanced (auto)
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| private predicate lastDeclAfter(AstNode node, SiblingShadowingDecl decl) { | ||
| node = decl | ||
| or | ||
| node = any(Conditional cond | isUnscopedConditional(cond) and lastDeclInBranch(cond, decl)) |
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| let has_explicit_initializer = members | ||
| .iter() | ||
| .any(|member| find_initializer(ctx.output, *member).is_some()); |
| (if_expr | ||
| // Mark this `if_expr` as coming from conditional compilation. | ||
| modifier: (modifier "conditional_compilation") | ||
| condition: {condition} |
| /** A `Stmt` at the top-level. */ | ||
| final class TopLevelStmt extends Stmt { | ||
| TopLevelStmt() { this = any(TopLevel t).getBody().getAStmt() } | ||
| TopLevelStmt() { this = any(TopLevel t).getBody().getASemanticStmt() } |
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Some partial comments so far. I still need to review the local scoping changes.
| /** A block statement. */ | ||
| class Block extends G::Block { | ||
| /** Gets a statement, looking through conditional-compilation branches. */ | ||
| Stmt getASemanticStmt() { result = compilationExpandedStmt(this.getAStmt()) } |
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The API we get after these changes:
- Classes:
getADirectMember()-- raw ASTgetAMember()-- include members in conditionalsgetAMemberIncludingExtensions()-- include members in extensions and conditionals
- Blocks:
getAStmt()-- raw ASTgetASemanticStmt()-- include members in conditionals
This is not a very consistent naming scheme. We can do better.
I'd suggest the following API. Boring but consistent.
- Classes:
getAMember()-- raw ASTgetAMemberIncludingConditionals()-- include members in conditionals (but not extensions)getAMemberIncludingExtensions()-- include members in extensions and conditionals
- Blocks:
getAStmt()-- raw ASTgetAStmtIncludingConditionals()-- renamed version ofgetASemanticStmt()
getAStmtIncludingConditionals() could possibly be removed and rolled into TopLevelStmt as it's the only current use-case (the other call sites can just use TopLevelStmt) but I admit it's hard to say if more use-cases will emerge.
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Some thoughts:
-
I think it's a downside that the "wrong" predicate (the raw member version for classes, which is rarely what you want) gets the shorter nicer name. That's why I renamed
getAMembertogetADirectMember, to make the probably-not-what-you-want predicate to have a longer name.For blocks it's different. Often get
getASemanticStmtisn't what you want, so I was ok withgetAStmthaving the short name. -
From the name it's not clear that
getAMemberIncludingExtensionsalso includes members in conditional compilation blocks. -
The word "semantic" is more vague, but also open to other things getting included in the future.
I don't have a strong preference though, so the suggested change (or other variations) are fine by me.
| * Gets the `i`th member in source order across all conditional-compilation alternatives, | ||
| * indexed from zero. | ||
| */ | ||
| Member getMember(int i) { |
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I don't think we should provide indexed-access for "flattening accessors" like this. There should just be the plural version.
Extract conditional compilation blocks as if expressions. Members can now be nested inside conditional compilation blocks. Rename `member` to `direct_member` as this is now usually the wrong thing to access. A new predicate on the QL side finds all members, both direct and indirect ones through conditional compilation blocks.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 8f3fac01-33b2-423c-b823-11035cf44b84
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Extract Swift conditional compilation blocks and handle them in local name binding.
Some of the changes:
Extract
#if/#elseif/#elseas nestedifexpressions.Separate direct class members from compilation-expanded members, exposed through
getAMember()/getMember(i).Extend the shared local name binding library to handle conditional-compilation blocks. The comments in QL should explain the changes for this.
NB: This PR does not adapt static name bindings to handle conditional compilation. I thought the PR was big enough as-is, so I'll do that in follow up work.
I suggest per-commit review.