mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-26 08:44:35 +00:00
95 lines
2.6 KiB
Rust
95 lines
2.6 KiB
Rust
//@ compile-flags: -O
|
|
#![crate_type = "lib"]
|
|
|
|
// Make sure no bounds checks are emitted when slicing or indexing
|
|
// with an index from `position()` or `rposition()`.
|
|
|
|
// CHECK-LABEL: @position_slice_to_no_bounds_check
|
|
#[no_mangle]
|
|
pub fn position_slice_to_no_bounds_check(s: &[u8]) -> &[u8] {
|
|
// CHECK-NOT: panic
|
|
// CHECK-NOT: slice_start_index_len_fail
|
|
// CHECK-NOT: slice_end_index_len_fail
|
|
// CHECK-NOT: panic_bounds_check
|
|
// CHECK-NOT: unreachable
|
|
if let Some(idx) = s.iter().position(|b| *b == b'\\') {
|
|
&s[..idx]
|
|
} else {
|
|
s
|
|
}
|
|
}
|
|
|
|
// CHECK-LABEL: @position_slice_from_no_bounds_check
|
|
#[no_mangle]
|
|
pub fn position_slice_from_no_bounds_check(s: &[u8]) -> &[u8] {
|
|
// CHECK-NOT: panic
|
|
// CHECK-NOT: slice_start_index_len_fail
|
|
// CHECK-NOT: slice_end_index_len_fail
|
|
// CHECK-NOT: panic_bounds_check
|
|
// CHECK-NOT: unreachable
|
|
if let Some(idx) = s.iter().position(|b| *b == b'\\') {
|
|
&s[idx..]
|
|
} else {
|
|
s
|
|
}
|
|
}
|
|
|
|
// CHECK-LABEL: @position_index_no_bounds_check
|
|
#[no_mangle]
|
|
pub fn position_index_no_bounds_check(s: &[u8]) -> u8 {
|
|
// CHECK-NOT: panic
|
|
// CHECK-NOT: slice_start_index_len_fail
|
|
// CHECK-NOT: slice_end_index_len_fail
|
|
// CHECK-NOT: panic_bounds_check
|
|
// CHECK-NOT: unreachable
|
|
if let Some(idx) = s.iter().position(|b| *b == b'\\') {
|
|
s[idx]
|
|
} else {
|
|
42
|
|
}
|
|
}
|
|
// CHECK-LABEL: @rposition_slice_to_no_bounds_check
|
|
#[no_mangle]
|
|
pub fn rposition_slice_to_no_bounds_check(s: &[u8]) -> &[u8] {
|
|
// CHECK-NOT: panic
|
|
// CHECK-NOT: slice_start_index_len_fail
|
|
// CHECK-NOT: slice_end_index_len_fail
|
|
// CHECK-NOT: panic_bounds_check
|
|
// CHECK-NOT: unreachable
|
|
if let Some(idx) = s.iter().rposition(|b| *b == b'\\') {
|
|
&s[..idx]
|
|
} else {
|
|
s
|
|
}
|
|
}
|
|
|
|
// CHECK-LABEL: @rposition_slice_from_no_bounds_check
|
|
#[no_mangle]
|
|
pub fn rposition_slice_from_no_bounds_check(s: &[u8]) -> &[u8] {
|
|
// CHECK-NOT: panic
|
|
// CHECK-NOT: slice_start_index_len_fail
|
|
// CHECK-NOT: slice_end_index_len_fail
|
|
// CHECK-NOT: panic_bounds_check
|
|
// CHECK-NOT: unreachable
|
|
if let Some(idx) = s.iter().rposition(|b| *b == b'\\') {
|
|
&s[idx..]
|
|
} else {
|
|
s
|
|
}
|
|
}
|
|
|
|
// CHECK-LABEL: @rposition_index_no_bounds_check
|
|
#[no_mangle]
|
|
pub fn rposition_index_no_bounds_check(s: &[u8]) -> u8 {
|
|
// CHECK-NOT: panic
|
|
// CHECK-NOT: slice_start_index_len_fail
|
|
// CHECK-NOT: slice_end_index_len_fail
|
|
// CHECK-NOT: panic_bounds_check
|
|
// CHECK-NOT: unreachable
|
|
if let Some(idx) = s.iter().rposition(|b| *b == b'\\') {
|
|
s[idx]
|
|
} else {
|
|
42
|
|
}
|
|
}
|