71ef8414bd
The previous code paniced if offset_bytes == i64::MIN. This commit: - Properly computes the absoulte value to avoid this panic - Adds a test for this edge case Signed-off-by: Joe Richey <joerichey@google.com>
25 lines
1.2 KiB
Rust
25 lines
1.2 KiB
Rust
// ignore-tidy-linelength
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#![feature(const_ptr_offset)]
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use std::ptr;
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// normalize-stderr-test "alloc\d+" -> "allocN"
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pub const BEFORE_START: *const u8 = unsafe { (&0u8 as *const u8).offset(-1) }; //~NOTE
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pub const AFTER_END: *const u8 = unsafe { (&0u8 as *const u8).offset(2) }; //~NOTE
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pub const AFTER_ARRAY: *const u8 = unsafe { [0u8; 100].as_ptr().offset(101) }; //~NOTE
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pub const OVERFLOW: *const u16 = unsafe { [0u16; 1].as_ptr().offset(isize::MAX) }; //~NOTE
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pub const UNDERFLOW: *const u16 = unsafe { [0u16; 1].as_ptr().offset(isize::MIN) }; //~NOTE
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pub const OVERFLOW_ADDRESS_SPACE: *const u8 = unsafe { (usize::MAX as *const u8).offset(2) }; //~NOTE
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pub const UNDERFLOW_ADDRESS_SPACE: *const u8 = unsafe { (1 as *const u8).offset(-2) }; //~NOTE
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pub const ZERO_SIZED_ALLOC: *const u8 = unsafe { [0u8; 0].as_ptr().offset(1) }; //~NOTE
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pub const DANGLING: *const u8 = unsafe { ptr::NonNull::<u8>::dangling().as_ptr().offset(4) }; //~NOTE
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// Right now, a zero offset from null is UB
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pub const NULL_OFFSET_ZERO: *const u8 = unsafe { ptr::null::<u8>().offset(0) }; //~NOTE
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// Make sure that we don't panic when computing abs(offset*size_of::<T>())
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pub const UNDERFLOW_ABS: *const u8 = unsafe { (usize::MAX as *const u8).offset(isize::MIN) }; //~NOTE
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fn main() {}
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