diff options
Diffstat (limited to 'src/test')
| -rw-r--r-- | src/test/codegen/mem-replace-direct-memcpy.rs | 25 | ||||
| -rw-r--r-- | src/test/ui/const-ptr/out_of_bounds_read.stderr | 45 |
2 files changed, 40 insertions, 30 deletions
diff --git a/src/test/codegen/mem-replace-direct-memcpy.rs b/src/test/codegen/mem-replace-direct-memcpy.rs new file mode 100644 index 00000000000..47f4fc27fd8 --- /dev/null +++ b/src/test/codegen/mem-replace-direct-memcpy.rs @@ -0,0 +1,25 @@ +// This test ensures that `mem::replace::<T>` only ever calls `@llvm.memcpy` +// with `size_of::<T>()` as the size, and never goes through any wrapper that +// may e.g. multiply `size_of::<T>()` with a variable "count" (which is only +// known to be `1` after inlining). + +// compile-flags: -C no-prepopulate-passes + +#![crate_type = "lib"] + +pub fn replace_byte(dst: &mut u8, src: u8) -> u8 { + std::mem::replace(dst, src) +} + +// NOTE(eddyb) the `CHECK-NOT`s ensure that the only calls of `@llvm.memcpy` in +// the entire output, are the two direct calls we want, from `ptr::{read,write}`. + +// CHECK-NOT: call void @llvm.memcpy +// CHECK: ; core::ptr::read +// CHECK-NOT: call void @llvm.memcpy +// CHECK: call void @llvm.memcpy.p0i8.p0i8.i{{.*}}(i8* align 1 %{{.*}}, i8* align 1 %src, i{{.*}} 1, i1 false) +// CHECK-NOT: call void @llvm.memcpy +// CHECK: ; core::ptr::write +// CHECK-NOT: call void @llvm.memcpy +// CHECK: call void @llvm.memcpy.p0i8.p0i8.i{{.*}}(i8* align 1 %dst, i8* align 1 %src, i{{.*}} 1, i1 false) +// CHECK-NOT: call void @llvm.memcpy diff --git a/src/test/ui/const-ptr/out_of_bounds_read.stderr b/src/test/ui/const-ptr/out_of_bounds_read.stderr index 04503495bc6..62af6a6adb6 100644 --- a/src/test/ui/const-ptr/out_of_bounds_read.stderr +++ b/src/test/ui/const-ptr/out_of_bounds_read.stderr @@ -1,16 +1,11 @@ error[E0080]: evaluation of constant value failed - --> $SRC_DIR/core/src/intrinsics.rs:LL:COL - | -LL | unsafe { copy_nonoverlapping(src, dst, count) } - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - | | - | memory access failed: alloc7 has size 4, so pointer to 4 bytes starting at offset 4 is out-of-bounds - | inside `copy_nonoverlapping::<u32>` at $SRC_DIR/core/src/intrinsics.rs:LL:COL - | - ::: $SRC_DIR/core/src/ptr/mod.rs:LL:COL + --> $SRC_DIR/core/src/ptr/mod.rs:LL:COL | LL | copy_nonoverlapping(src, tmp.as_mut_ptr(), 1); - | --------------------------------------------- inside `std::ptr::read::<u32>` at $SRC_DIR/core/src/ptr/mod.rs:LL:COL + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | | + | memory access failed: alloc7 has size 4, so pointer to 4 bytes starting at offset 4 is out-of-bounds + | inside `std::ptr::read::<u32>` at $SRC_DIR/core/src/ptr/mod.rs:LL:COL | ::: $DIR/out_of_bounds_read.rs:13:33 | @@ -18,18 +13,13 @@ LL | const _READ: u32 = unsafe { ptr::read(PAST_END_PTR) }; | ----------------------- inside `_READ` at $DIR/out_of_bounds_read.rs:13:33 error[E0080]: evaluation of constant value failed - --> $SRC_DIR/core/src/intrinsics.rs:LL:COL - | -LL | unsafe { copy_nonoverlapping(src, dst, count) } - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - | | - | memory access failed: alloc7 has size 4, so pointer to 4 bytes starting at offset 4 is out-of-bounds - | inside `copy_nonoverlapping::<u32>` at $SRC_DIR/core/src/intrinsics.rs:LL:COL - | - ::: $SRC_DIR/core/src/ptr/mod.rs:LL:COL + --> $SRC_DIR/core/src/ptr/mod.rs:LL:COL | LL | copy_nonoverlapping(src, tmp.as_mut_ptr(), 1); - | --------------------------------------------- inside `std::ptr::read::<u32>` at $SRC_DIR/core/src/ptr/mod.rs:LL:COL + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | | + | memory access failed: alloc7 has size 4, so pointer to 4 bytes starting at offset 4 is out-of-bounds + | inside `std::ptr::read::<u32>` at $SRC_DIR/core/src/ptr/mod.rs:LL:COL | ::: $SRC_DIR/core/src/ptr/const_ptr.rs:LL:COL | @@ -42,18 +32,13 @@ LL | const _CONST_READ: u32 = unsafe { PAST_END_PTR.read() }; | ------------------- inside `_CONST_READ` at $DIR/out_of_bounds_read.rs:14:39 error[E0080]: evaluation of constant value failed - --> $SRC_DIR/core/src/intrinsics.rs:LL:COL - | -LL | unsafe { copy_nonoverlapping(src, dst, count) } - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - | | - | memory access failed: alloc7 has size 4, so pointer to 4 bytes starting at offset 4 is out-of-bounds - | inside `copy_nonoverlapping::<u32>` at $SRC_DIR/core/src/intrinsics.rs:LL:COL - | - ::: $SRC_DIR/core/src/ptr/mod.rs:LL:COL + --> $SRC_DIR/core/src/ptr/mod.rs:LL:COL | LL | copy_nonoverlapping(src, tmp.as_mut_ptr(), 1); - | --------------------------------------------- inside `std::ptr::read::<u32>` at $SRC_DIR/core/src/ptr/mod.rs:LL:COL + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | | + | memory access failed: alloc7 has size 4, so pointer to 4 bytes starting at offset 4 is out-of-bounds + | inside `std::ptr::read::<u32>` at $SRC_DIR/core/src/ptr/mod.rs:LL:COL | ::: $SRC_DIR/core/src/ptr/mut_ptr.rs:LL:COL | |