Don't evaluate the sanitizer attribute if no sanitizer is enabled

[1c3t3a]

This is just logical as the attribute has anyways no effect in that case.

This is in reaction to some perf-metrics going up after #142681, specifically mentioned here: #142681 (comment).

r? rcvalle

[rustbot]

Some changes occurred in compiler/rustc_codegen_ssa

cc @WaffleLapkin

[1c3t3a]

@rustbot label +PG-exploit-mitigations

[Kobzol]

@bors try @rust-timer queue

[rust-log-analyzer]

The job aarch64-gnu-llvm-19-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

64 
- error: invalid argument for `sanitize`
-   --> $DIR/invalid-sanitize.rs:3:1
-    |
- LL | #[sanitize(brontosaurus = "off")]
-    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-    |
-    = note: expected one of: `address`, `kernel_address`, `cfi`, `hwaddress`, `kcfi`, `memory`, `memtag`, `shadow_call_stack`, or `thread`
- 
- error: invalid argument for `sanitize`
-   --> $DIR/invalid-sanitize.rs:15:1
-    |
- LL | #[sanitize(address = "bogus")]
-    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-    |
-    = note: expected one of: `address`, `kernel_address`, `cfi`, `hwaddress`, `kcfi`, `memory`, `memtag`, `shadow_call_stack`, or `thread`
- 
- error: aborting due to 6 previous errors
+ error: aborting due to 4 previous errors
82 
83 
---
To only update this specific test, also pass `--test-args sanitize-attr/invalid-sanitize.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/sanitize-attr/invalid-sanitize.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/sanitize-attr/invalid-sanitize" "-A" "unused" "-A" "internal_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
error: malformed `sanitize` attribute input
##[error]  --> /checkout/tests/ui/sanitize-attr/invalid-sanitize.rs:18:1
   |
LL | #[sanitize = "off"] //~ ERROR malformed `sanitize` attribute input
   | ^^^^^^^^^^^^^^^^^^^
   |
help: the following are the possible correct uses
   |
LL - #[sanitize = "off"] //~ ERROR malformed `sanitize` attribute input
LL + #[sanitize(address = "on|off")] //~ ERROR malformed `sanitize` attribute input
   |
LL - #[sanitize = "off"] //~ ERROR malformed `sanitize` attribute input
LL + #[sanitize(cfi = "on|off")] //~ ERROR malformed `sanitize` attribute input
   |
LL - #[sanitize = "off"] //~ ERROR malformed `sanitize` attribute input
LL + #[sanitize(hwaddress = "on|off")] //~ ERROR malformed `sanitize` attribute input
   |
LL - #[sanitize = "off"] //~ ERROR malformed `sanitize` attribute input
LL + #[sanitize(kcfi = "on|off")] //~ ERROR malformed `sanitize` attribute input
   |
   = and 5 other candidates

error: malformed `sanitize` attribute input
##[error]  --> /checkout/tests/ui/sanitize-attr/invalid-sanitize.rs:21:1
   |
LL | #[sanitize] //~ ERROR malformed `sanitize` attribute input
   | ^^^^^^^^^^^
   |
help: the following are the possible correct uses
   |
LL | #[sanitize(address = "on|off")] //~ ERROR malformed `sanitize` attribute input
   |           ++++++++++++++++++++
LL | #[sanitize(cfi = "on|off")] //~ ERROR malformed `sanitize` attribute input
   |           ++++++++++++++++
LL | #[sanitize(hwaddress = "on|off")] //~ ERROR malformed `sanitize` attribute input
   |           ++++++++++++++++++++++
LL | #[sanitize(kcfi = "on|off")] //~ ERROR malformed `sanitize` attribute input
   |           +++++++++++++++++
   = and 5 other candidates

error: multiple `sanitize` attributes
##[error]  --> /checkout/tests/ui/sanitize-attr/invalid-sanitize.rs:7:1
   |
LL | #[sanitize(address = "off")] //~ ERROR multiple `sanitize` attributes
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
   |
note: attribute also specified here
  --> /checkout/tests/ui/sanitize-attr/invalid-sanitize.rs:8:1
   |
LL | #[sanitize(address = "off")]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: multiple `sanitize` attributes
##[error]  --> /checkout/tests/ui/sanitize-attr/invalid-sanitize.rs:11:1
   |
LL | #[sanitize(address = "on")] //~ ERROR multiple `sanitize` attributes
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove this attribute
   |
note: attribute also specified here
  --> /checkout/tests/ui/sanitize-attr/invalid-sanitize.rs:12:1
   |
---
---- [ui] tests/ui/sanitizer/inline-always-sanitize.rs stdout ----
Saved the actual stderr to `/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/sanitizer/inline-always-sanitize/inline-always-sanitize.stderr`
diff of stderr:

- warning: setting `sanitize` off will have no effect after inlining
-   --> $DIR/inline-always-sanitize.rs:7:1
-    |
- LL | #[sanitize(address = "off")]
-    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-    |
---
To only update this specific test, also pass `--test-args sanitizer/inline-always-sanitize.rs`

error: 1 errors occurred comparing output.
status: exit status: 0
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/sanitizer/inline-always-sanitize.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/sanitizer/inline-always-sanitize" "-A" "unused" "-A" "internal_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
stderr: none

[rust-bors]

☀️ Try build successful (CI)
Build commit: 6fcc151 (6fcc151168d674963a5c4f2a8117d8f11ae01478, parent: e8a792daf500b5ff8097896ddb6cc037abe92487)

[rust-timer]

Finished benchmarking commit (6fcc151): comparison URL.

Overall result: ✅ improvements - no action needed

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

@bors rollup=never
@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.4%	[-0.8%, -0.2%]	6
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (secondary 2.5%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.5%	[2.5%, 2.5%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary -1.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.9%	[2.6%, 3.2%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.7%	[-4.6%, -2.7%]	3
All ❌✅ (primary)	-	-	0

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 471.66s -> 470.248s (-0.30%)
Artifact size: 378.20 MiB -> 378.28 MiB (0.02%)