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Rust: Fix rust/unused-variable FPs #17913

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Merged
merged 10 commits into from
Nov 8, 2024
Merged

Rust: Fix rust/unused-variable FPs #17913

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3091083
Rust: Call all the test cases.
geoffw0 Nov 5, 2024
35ffd0c
Rust: Add more test cases for unused variables (inspired by real worl…
geoffw0 Nov 5, 2024
278760c
Rust: Add another exception to rust/unused-variable.
geoffw0 Nov 5, 2024
93836a5
Rust: Clean up code / clarify responsibilities and fix the issue in r…
geoffw0 Nov 5, 2024
1a5d2e1
Rust: Correct a comment and autoformat.
geoffw0 Nov 5, 2024
8a35e15
Rust: Move the function pointer parameter exclusion into VariableImpl…
geoffw0 Nov 6, 2024
18ce8be
Update rust/ql/lib/codeql/rust/elements/internal/VariableImpl.qll
geoffw0 Nov 6, 2024
df7bcfd
Rust: Accept dataflow consistency check changes.
geoffw0 Nov 7, 2024
fc444f1
Merge branch 'main' into unusedvar8
geoffw0 Nov 8, 2024
7c2c5ee
Rust: Fix expected consistency results.
geoffw0 Nov 8, 2024
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6 changes: 5 additions & 1 deletion rust/ql/src/queries/unusedentities/UnusedVariable.qll
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Original file line number Diff line number Diff line change
Expand Up @@ -7,8 +7,12 @@ class DiscardVariable extends Variable {

/** Holds if variable `v` is unused. */
predicate isUnused(Variable v) {
// variable is accessed or initialized
not exists(v.getAnAccess()) and
not exists(v.getInitializer()) and
// variable is intentionally unused
not v instanceof DiscardVariable and
not v.getPat().isInMacroExpansion()
// variable is in a context where is may not have a use
not v.getPat().isInMacroExpansion() and
not exists(FnPtrType fp | fp.getParamList().getParam(_).getPat() = v.getPat())
}
4 changes: 4 additions & 0 deletions rust/ql/test/query-tests/unusedentities/UnusedValue.expected
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Expand Up @@ -15,6 +15,10 @@
| main.rs:373:9:373:9 | x | Variable $@ is assigned a value that is never used. | main.rs:373:9:373:9 | x | x |
| main.rs:381:17:381:17 | x | Variable $@ is assigned a value that is never used. | main.rs:381:17:381:17 | x | x |
| main.rs:482:9:482:9 | c | Variable $@ is assigned a value that is never used. | main.rs:482:9:482:9 | c | c |
| main.rs:494:16:494:16 | x | Variable $@ is assigned a value that is never used. | main.rs:494:16:494:16 | x | x |
| main.rs:495:16:495:16 | y | Variable $@ is assigned a value that is never used. | main.rs:495:16:495:16 | y | y |
| main.rs:496:12:496:12 | z | Variable $@ is assigned a value that is never used. | main.rs:496:12:496:12 | z | z |
| main.rs:499:18:499:18 | x | Variable $@ is assigned a value that is never used. | main.rs:499:18:499:18 | x | x |
| more.rs:44:9:44:14 | a_ptr4 | Variable $@ is assigned a value that is never used. | more.rs:44:9:44:14 | a_ptr4 | a_ptr4 |
| more.rs:59:9:59:13 | d_ptr | Variable $@ is assigned a value that is never used. | more.rs:59:9:59:13 | d_ptr | d_ptr |
| more.rs:65:9:65:17 | f_ptr | Variable $@ is assigned a value that is never used. | more.rs:65:13:65:17 | f_ptr | f_ptr |
4 changes: 0 additions & 4 deletions rust/ql/test/query-tests/unusedentities/UnusedVariable.expected
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Expand Up @@ -19,8 +19,4 @@
| main.rs:427:26:427:28 | val | Variable 'val' is not used. |
| main.rs:430:21:430:23 | acc | Variable 'acc' is not used. |
| main.rs:451:9:451:14 | unused | Variable 'unused' is not used. |
| main.rs:494:16:494:16 | x | Variable 'x' is not used. |
| main.rs:495:16:495:16 | y | Variable 'y' is not used. |
| main.rs:496:12:496:12 | z | Variable 'z' is not used. |
| main.rs:499:18:499:18 | x | Variable 'x' is not used. |
| more.rs:24:9:24:11 | val | Variable 'val' is not used. |
8 changes: 4 additions & 4 deletions rust/ql/test/query-tests/unusedentities/main.rs
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Expand Up @@ -491,12 +491,12 @@ fn references() {

pub struct my_declaration {
field1: fn(i32) -> i32,
field2: fn(x: i32) -> i32, // $ SPURIOUS: Alert[rust/unused-variable]
field3: fn(y: // $ SPURIOUS: Alert[rust/unused-variable]
fn(z: i32) -> i32) -> i32, // $ SPURIOUS: Alert[rust/unused-variable]
field2: fn(x: i32) -> i32, // $ SPURIOUS: Alert[rust/unused-value]
field3: fn(y: // $ SPURIOUS: Alert[rust/unused-value]
fn(z: i32) -> i32) -> i32, // $ SPURIOUS: Alert[rust/unused-value]
}

type MyType = fn(x: i32) -> i32; // $ SPURIOUS: Alert[rust/unused-variable]
type MyType = fn(x: i32) -> i32; // $ SPURIOUS: Alert[rust/unused-value]

trait MyTrait {
fn my_func2(&self, x: i32) -> i32;
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