fix asan false positive

Author: Brooooooklyn

.github/workflows/CI.yml

@@ -111,7 +111,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Test with ASAN
-        run: cargo test --tests --target x86_64-unknown-linux-gnu
+        run: cargo test --tests --target x86_64-unknown-linux-gnu --features asan
         env:
           RUST_TARGET: x86_64-unknown-linux-gnu
           RUST_BACKTRACE: 1

Cargo.toml

@@ -18,6 +18,7 @@ path = "examples/escape.rs"
 
 [features]
 codspeed = ["criterion2/codspeed"]
+asan = [] # for ASAN
 
 [[bench]]
 name = "escape"

src/simd/avx2.rs

@@ -232,7 +232,7 @@ pub unsafe fn format_string(value: &str, dst: &mut [u8]) -> usize {
                         std::ptr::copy_nonoverlapping(sptr, placeholder[..].as_mut_ptr(), nb);
                         Simd256u::loadu(placeholder[..].as_ptr())
                     } else {
-                        #[cfg(any(debug_assertions, miri))]
+                        #[cfg(any(debug_assertions, miri, feature = "asan"))]
                         {
                             std::ptr::copy_nonoverlapping(sptr, placeholder[..].as_mut_ptr(), nb);
                             Simd256u::loadu(placeholder[..].as_ptr())

src/simd/avx512.rs

@@ -225,7 +225,7 @@ pub unsafe fn format_string(value: &str, dst: &mut [u8]) -> usize {
                         std::ptr::copy_nonoverlapping(sptr, placeholder[..].as_mut_ptr(), nb);
                         Simd512u::loadu(placeholder[..].as_ptr())
                     } else {
-                        #[cfg(any(debug_assertions, miri))]
+                        #[cfg(any(debug_assertions, miri, feature = "asan"))]
                         {
                             std::ptr::copy_nonoverlapping(sptr, placeholder[..].as_mut_ptr(), nb);
                             Simd512u::loadu(placeholder[..].as_ptr())

src/simd/neon.rs

@@ -233,7 +233,7 @@ pub unsafe fn format_string(value: &str, dst: &mut [u8]) -> usize {
                         std::ptr::copy_nonoverlapping(sptr, placeholder[..].as_mut_ptr(), nb);
                         Simd128u::loadu(placeholder[..].as_ptr())
                     } else {
-                        #[cfg(any(debug_assertions, miri))]
+                        #[cfg(any(debug_assertions, miri, feature = "asan"))]
                         {
                             std::ptr::copy_nonoverlapping(sptr, placeholder[..].as_mut_ptr(), nb);
                             Simd128u::loadu(placeholder[..].as_ptr())

src/simd/sse2.rs

@@ -229,7 +229,7 @@ pub unsafe fn format_string(value: &str, dst: &mut [u8]) -> usize {
                         std::ptr::copy_nonoverlapping(sptr, placeholder[..].as_mut_ptr(), nb);
                         Simd128u::loadu(placeholder[..].as_ptr())
                     } else {
-                        #[cfg(any(debug_assertions, miri))]
+                        #[cfg(any(debug_assertions, miri, feature = "asan"))]
                         {
                             std::ptr::copy_nonoverlapping(sptr, placeholder[..].as_mut_ptr(), nb);
                             Simd128u::loadu(placeholder[..].as_ptr())

src/simd/v128.rs

@@ -161,7 +161,7 @@ pub fn format_string(value: &str, dst: &mut [u8]) -> usize {
                         std::ptr::copy_nonoverlapping(sptr, placeholder[..].as_mut_ptr(), nb);
                         Simd128u::loadu(placeholder[..].as_ptr())
                     } else {
-                        #[cfg(any(debug_assertions, miri))]
+                        #[cfg(any(debug_assertions, miri, feature = "asan"))]
                         {
                             std::ptr::copy_nonoverlapping(sptr, placeholder[..].as_mut_ptr(), nb);
                             Simd128u::loadu(placeholder[..].as_ptr())