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Rust: Add type inference debug predicates #19425

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Apr 30, 2025
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Rust: Add type inference debug predicates #19425

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21 changes: 21 additions & 0 deletions rust/ql/lib/codeql/rust/internal/TypeInference.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -1017,3 +1017,24 @@
* Gets a type that `n` infers to, if any.
*/
Type inferType(AstNode n) { result = inferType(n, TypePath::nil()) }

/** Provides predicates for debugging the type inference implementation. */
private module Debug {

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private Locatable getRelevantLocatable() {
exists(string filepath, int startline, int startcolumn, int endline, int endcolumn |

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result.getLocation().hasLocationInfo(filepath, startline, startcolumn, endline, endcolumn) and
filepath.matches("%/tauri/src/app/plugin.rs") and
startline = 54
)
}

Type debugInferType(AstNode n, TypePath path) {
n = getRelevantLocatable() and
result = inferType(n, path)
}

Function debugResolveMethodCallExpr(MethodCallExpr mce) {
mce = getRelevantLocatable() and
result = resolveMethodCallExpr(mce)
}
}