Rust: add some `toString` implementations #18035

redsun82 · 2024-11-19T16:21:38Z

This sets up better toString implementations to give more meaningful test expectations and AST printing results.

This is by no means systematic and complete. Most notably almost all type representations are still missing, and some less frequent Exprs, but it should get us started.

The strategy is to make toString as close as possible to the rust syntax, but

skipping things like attributes altogether
replacing "complex" subnodes with ...

What is considered a "simple" subnode (causing it to be part of the parent toString) can be tweaked by implementing toAbbreviatedString(), which returns ... by default. Currently simple subnodes are:

literal expressions and patterns
_ expressions and patterns
path expressions and patterns (i.e. name references)

This means for example that

a call with an identifier target will have that identifier in its toString (i.e. source(...))
same goes for operations (i.e. x + ....) or statements (if cond {...})

rust/ql/lib/codeql/rust/elements/internal/CallExprImpl.qll

Also make `--learn` work with the nested qltest tests.

rust/ql/test/query-tests/diagnostics/does_not_compile.rs

rust/ql/lib/codeql/rust/elements.qll

 import codeql.rust.elements.Item
 import codeql.rust.elements.ItemList
 import codeql.rust.elements.Label
+import codeql.rust.elements.LabelableExpr


rust/ql/lib/codeql/rust/elements.qll

@@ -74,6 +75,7 @@
 import codeql.rust.elements.LiteralPat
 import codeql.rust.elements.Locatable
 import codeql.rust.elements.LoopExpr
+import codeql.rust.elements.LoopingExpr


rust/ql/lib/codeql/rust/elements/LoopingExpr.qll

+
+private import internal.LoopingExprImpl
+import codeql.rust.elements.BlockExpr
+import codeql.rust.elements.LabelableExpr


rust/ql/lib/codeql/rust/elements/internal/OrPatImpl.qll

redsun82 · 2024-11-20T16:37:22Z

rust/ql/lib/codeql/rust/elements/internal/LiteralExprImpl.qll

@@ -27,5 +27,7 @@ module Impl {
   */
  class LiteralExpr extends Generated::LiteralExpr {
    override string toString() { result = this.getTextValue() }
+
+    override string toAbbreviatedString() { result = this.getTextValue() }


I now thought we might want to trim long literals here

geoffw0 · 2024-11-20T18:48:23Z

rust/ql/test/library-tests/variables/variables.expected

-| variables.rs:332:9:332:9 | v | variables.rs:332:13:332:41 | RefExpr |
+| variables.rs:155:9:155:10 | p2 | variables.rs:155:14:155:37 | Point {...} |
+| variables.rs:169:9:169:11 | msg | variables.rs:169:15:169:38 | Message::Hello {...} |
+| variables.rs:189:9:189:14 | either | variables.rs:189:18:189:33 | Either::Left(...) |


I'm probably not the right person to review the extractor changes right now but I will say this: these look good, much better than before.

hvitved

Thanks a lot for taking on this task! My main concern is that ideally toString should not be recursive, since (a) it takes longer to evaluate, (b) the DIL becomes more complex, and (c) it prevents magic sets optimizations.

hvitved · 2024-11-21T08:14:05Z

rust/ql/lib/codeql/rust/elements/internal/BreakExprImpl.qll

@@ -102,5 +103,15 @@ module Impl {
        isLabelled(result, label)
      )
    }
+
+    override string toString() { result = concat(int i | | this.toStringPart(i), " " order by i) }


May as well use strictconcat.

hvitved · 2024-11-21T08:18:32Z

rust/ql/lib/codeql/rust/elements/internal/CastExprImpl.qll

-  class CastExpr extends Generated::CastExpr { }
+  class CastExpr extends Generated::CastExpr {
+    override string toString() {
+      result = this.getExpr().toAbbreviatedString() + " as " + this.getTy().toString()


We should avoid, if possible, to make toString recursive. Could we instead have a predicate, getName, on TypeRef?

hvitved · 2024-11-21T08:20:20Z

rust/ql/lib/codeql/rust/elements/internal/ContinueExprImpl.qll

+    private string toStringPart(int index) {
+      index = 0 and result = "continue"
+      or
+      index = 1 and result = this.getLifetime().toString()


Again, better if we can avoid recursion.

hvitved · 2024-11-21T08:21:07Z

rust/ql/lib/codeql/rust/elements/internal/EnumImpl.qll

  /**
   * A Enum. For example:
   * ```rust
   * todo!()
   * ```
   */
-  class Enum extends Generated::Enum { }
+  class Enum extends Generated::Enum {
+    override string toString() { result = "enum " + this.getName().toString() }


getText instead of toString.

hvitved · 2024-11-21T08:21:21Z

rust/ql/lib/codeql/rust/elements/internal/FieldExprImpl.qll

+    override string toString() {
+      exists(string abbr, string name |
+        abbr = this.getExpr().toAbbreviatedString() and
+        name = this.getNameRef().toString() and


Again, better if we can avoid recursion.

hvitved · 2024-11-21T08:30:37Z

rust/ql/lib/codeql/rust/elements/internal/RecordExprFieldImpl.qll

+    override string toString() { result = concat(int i | | this.toStringPart(i) order by i) }
+
+    private string toStringPart(int index) {
+      index = 0 and result = this.getNameRef().toString()


hvitved · 2024-11-21T08:30:45Z

rust/ql/lib/codeql/rust/elements/internal/RecordExprImpl.qll

@@ -21,5 +21,7 @@ module Impl {
   * Foo { .. } = second;
   * ```
   */
-  class RecordExpr extends Generated::RecordExpr { }
+  class RecordExpr extends Generated::RecordExpr {
+    override string toString() { result = this.getPath().toString() + " {...}" }


hvitved · 2024-11-21T08:30:51Z

rust/ql/lib/codeql/rust/elements/internal/RecordPatImpl.qll

@@ -21,5 +21,7 @@ module Impl {
   * }
   * ```
   */
-  class RecordPat extends Generated::RecordPat { }
+  class RecordPat extends Generated::RecordPat {
+    override string toString() { result = this.getPath().toString() + " {...}" }


hvitved · 2024-11-21T08:31:42Z

rust/ql/lib/codeql/rust/elements/internal/TraitImpl.qll

@@ -24,5 +24,7 @@ module Impl {
   * pub trait Foo<T: Frobinizable> where T::Frobinator: Eq {}
   * ```
   */
-  class Trait extends Generated::Trait { }
+  class Trait extends Generated::Trait {
+    override string toString() { result = "trait " + this.getName() }


hvitved · 2024-11-21T08:31:50Z

rust/ql/lib/codeql/rust/elements/internal/UnionImpl.qll

  /**
   * A Union. For example:
   * ```rust
   * todo!()
   * ```
   */
-  class Union extends Generated::Union { }
+  class Union extends Generated::Union {
+    override string toString() { result = "union " + this.getName().toString() }


…`toString`

rust/ql/consistency-queries/DataFlowConsistency.ql

…ype`

Rust: add some toString implementations

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github-actions bot added the Rust Pull requests that update Rust code label Nov 19, 2024

Paolo Tranquilli added 2 commits November 19, 2024 17:50

Rust: accept test changes

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Rust: accept integration test changes

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Paolo Tranquilli added 3 commits November 20, 2024 09:45

Rust: accept last integration test changes

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Also make `--learn` work with the nested qltest tests.

Rust: make CallExpr.toString use call identifier if present

57973df

Rust: fix non-existent string representations

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redsun82 commented Nov 20, 2024

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Rust: more advanced toString

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Paolo Tranquilli added 2 commits November 20, 2024 16:49

Rust: accept test changes

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Rust: fix OrPat.toString

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redsun82 marked this pull request as ready for review November 20, 2024 16:00

redsun82 commented Nov 20, 2024

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hvitved requested changes Nov 21, 2024

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Paolo Tranquilli added 2 commits November 21, 2024 11:13

Rust: fix Path.toString and address some review comments

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Rust: add consistency query printing AST classes of nodes with wrong …

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…`toString`

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Rust: add class printouts to AstConsistency.ql

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Merge branch 'main' into redsun82/rust-str

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Rust: tweak PathType string representations and add one for `InferT…

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Rust: add some `toString` implementations #18035

Rust: add some `toString` implementations #18035

redsun82 commented Nov 19, 2024 •

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Rust: add some `toString` implementations #18035

Rust: add some `toString` implementations #18035

redsun82 commented Nov 19, 2024 •

edited

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