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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/issues/issue-2470-bounds-check-overflow.rs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/test/ui/issues/issue-2470-bounds-check-overflow.rs b/src/test/ui/issues/issue-2470-bounds-check-overflow.rs new file mode 100644 index 000000000..f0e8e185e --- /dev/null +++ b/src/test/ui/issues/issue-2470-bounds-check-overflow.rs @@ -0,0 +1,27 @@ +// run-fail +// error-pattern:index out of bounds +// ignore-emscripten no processes + +use std::mem; + +fn main() { + + // This should cause a bounds-check panic, but may not if we do our + // bounds checking by comparing the scaled index to the vector's + // address-bounds, since we've scaled the index to wrap around to the + // address of the 0th cell in the array (even though the index is + // huge). + + let x = vec![1_usize, 2_usize, 3_usize]; + + let base = x.as_ptr() as usize; + let idx = base / mem::size_of::<usize>(); + println!("ov1 base = 0x{:x}", base); + println!("ov1 idx = 0x{:x}", idx); + println!("ov1 sizeof::<usize>() = 0x{:x}", mem::size_of::<usize>()); + println!("ov1 idx * sizeof::<usize>() = 0x{:x}", + idx * mem::size_of::<usize>()); + + // This should panic. + println!("ov1 0x{:x}", x[idx]); +} |