22098498149

Committed 17 Feb 2026 12:28PM UTC coverage: 52.283% (-1.7%) from 54.0%

Build # 22098498149

Build Type

push

github

Committed by

vigna

Commit Message

New covariance-checking infrastructure

Run Details

7 of 61 new or added lines in 11 files covered. (11.48%)

1 existing line in 1 file now uncovered.

790 of 1511 relevant lines covered (52.28%)

482.26 hits per line

Source File
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81.25

/epserde/src/impls/string.rs

/*
 * SPDX-FileCopyrightText: 2023 Inria
 * SPDX-FileCopyrightText: 2023 Sebastiano Vigna
 *
 * SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
 */

//! Implementations for strings.
//!
//! All string types have the same serialization type, `Box<str>`, and the same
//! deserialization type, `&str`. Thus, you can serialize a `String` and fully
//! deserialize it as `Box<str>`.
//!
//! Similarly to the case of [slices](crate::impls::slice), there is
//! a convenience [`SerInner`] implementation for `&str` that
//! serializes it as `Box<str>`.
//!
//! We provide type hashes for `String` and `str` so that they can be used
//! in [`PhantomData`](core::marker::PhantomData).

use crate::prelude::*;
use core::hash::Hash;
use deser::*;
use ser::*;

#[cfg(not(feature = "std"))]
use alloc::boxed::Box;

unsafe impl CopyType for String {
    type Copy = Deep;
}

#[cfg(not(feature = "std"))]
use alloc::string::String;

// For use with PhantomData
impl TypeHash for String {
    fn type_hash(hasher: &mut impl core::hash::Hasher) {
        "String".hash(hasher);
    }
}

impl SerInner for String {
    type SerType = Box<str>;
    const IS_ZERO_COPY: bool = false;

    unsafe fn _ser_inner(&self, backend: &mut impl WriteWithNames) -> ser::Result<()> {
        ser_slice_zero(backend, self.as_bytes())
    }
}

impl DeserInner for String {
    fn __check_covariance<'__long: '__short, '__short>(
        p: deser::CovariantProof<Self::DeserType<'__long>>,
    ) -> deser::CovariantProof<Self::DeserType<'__short>> {
        p
    }
    unsafe fn _deser_full_inner(backend: &mut impl ReadWithPos) -> deser::Result<Self> {
        let slice = unsafe { deser_full_vec_zero(backend) }?;
        Ok(String::from_utf8(slice).unwrap())
    }

    type DeserType<'a> = &'a str;

    unsafe fn _deser_eps_inner<'a>(
        backend: &mut SliceWithPos<'a>,
    ) -> deser::Result<Self::DeserType<'a>> {
        let slice = unsafe { deser_eps_slice_zero(backend) }?;
        // SAFETY: Actually this is unsafe if the data we read is not valid UTF-8
        Ok({
            unsafe {
                #[allow(clippy::transmute_bytes_to_str)]
                core::mem::transmute::<&'_ [u8], &'_ str>(slice)
            }
        })
    }
}

unsafe impl CopyType for Box<str> {
    type Copy = Deep;
}

impl TypeHash for Box<str> {
    fn type_hash(hasher: &mut impl core::hash::Hasher) {
        "Box<str>".hash(hasher);
    }
}

impl AlignHash for Box<str> {
    fn align_hash(_hasher: &mut impl core::hash::Hasher, _offset_of: &mut usize) {}
}

impl SerInner for Box<str> {
    type SerType = Self;
    // Box<[$ty]> can, but Vec<Box<[$ty]>> cannot!
    const IS_ZERO_COPY: bool = false;

    unsafe fn _ser_inner(&self, backend: &mut impl WriteWithNames) -> ser::Result<()> {
        ser_slice_zero(backend, self.as_bytes())
    }
}

impl DeserInner for Box<str> {
    fn __check_covariance<'__long: '__short, '__short>(
        p: deser::CovariantProof<Self::DeserType<'__long>>,
    ) -> deser::CovariantProof<Self::DeserType<'__short>> {
        p
    }
    #[inline(always)]
    unsafe fn _deser_full_inner(backend: &mut impl ReadWithPos) -> deser::Result<Self> {
        Ok(unsafe { String::_deser_full_inner(backend) }?.into_boxed_str())
    }

    type DeserType<'a> = &'a str;

    #[inline(always)]
    unsafe fn _deser_eps_inner<'a>(
        backend: &mut SliceWithPos<'a>,
    ) -> deser::Result<Self::DeserType<'a>> {
        unsafe { String::_deser_eps_inner(backend) }
    }
}

// For use with PhantomData
impl TypeHash for str {
    fn type_hash(hasher: &mut impl core::hash::Hasher) {
        "str".hash(hasher);
    }
}

// For use with PhantomData
impl TypeHash for &str {
    fn type_hash(hasher: &mut impl core::hash::Hasher) {
        "&str".hash(hasher);
    }
}
unsafe impl CopyType for &str {
    type Copy = Deep;
}

impl SerInner for &str {
    type SerType = Box<str>;
    const IS_ZERO_COPY: bool = false;

    unsafe fn _ser_inner(&self, backend: &mut impl WriteWithNames) -> ser::Result<()> {
        ser_slice_zero(backend, self.as_bytes())
    }
}

1	/*
2	* SPDX-FileCopyrightText: 2023 Inria
3	* SPDX-FileCopyrightText: 2023 Sebastiano Vigna
4	*
5	* SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
6	*/
7
8	//! Implementations for strings.
9	//!
10	//! All string types have the same serialization type, `Box<str>`, and the same
11	//! deserialization type, `&str`. Thus, you can serialize a `String` and fully
12	//! deserialize it as `Box<str>`.
13	//!
14	//! Similarly to the case of [slices](crate::impls::slice), there is
15	//! a convenience [`SerInner`] implementation for `&str` that
16	//! serializes it as `Box<str>`.
17	//!
18	//! We provide type hashes for `String` and `str` so that they can be used
19	//! in [`PhantomData`](core::marker::PhantomData).
20
21	use crate::prelude::*;
22	use core::hash::Hash;
23	use deser::*;
24	use ser::*;
25
26	#[cfg(not(feature = "std"))]
27	use alloc::boxed::Box;
28
29	unsafe impl CopyType for String {
30	type Copy = Deep;
31	}
32
33	#[cfg(not(feature = "std"))]
34	use alloc::string::String;
35
36	// For use with PhantomData
37	impl TypeHash for String {
38	fn type_hash(hasher: &mut impl core::hash::Hasher) {	1✔
39	"String".hash(hasher);	3✔
40	}
41	}
42
43	impl SerInner for String {
44	type SerType = Box<str>;
45	const IS_ZERO_COPY: bool = false;
46
47	unsafe fn _ser_inner(&self, backend: &mut impl WriteWithNames) -> ser::Result<()> {	22✔
48	ser_slice_zero(backend, self.as_bytes())	66✔
49	}
50	}
51
52	impl DeserInner for String {
NEW 53	fn __check_covariance<'__long: '__short, '__short>(	×
54	p: deser::CovariantProof<Self::DeserType<'__long>>,
55	) -> deser::CovariantProof<Self::DeserType<'__short>> {
NEW 56	p	×
57	}
58	unsafe fn _deser_full_inner(backend: &mut impl ReadWithPos) -> deser::Result<Self> {	695✔
59	let slice = unsafe { deser_full_vec_zero(backend) }?;	2,085✔
60	Ok(String::from_utf8(slice).unwrap())	1,390✔
61	}
62
63	type DeserType<'a> = &'a str;
64
65	unsafe fn _deser_eps_inner<'a>(	32✔
66	backend: &mut SliceWithPos<'a>,
67	) -> deser::Result<Self::DeserType<'a>> {
68	let slice = unsafe { deser_eps_slice_zero(backend) }?;	96✔
69	// SAFETY: Actually this is unsafe if the data we read is not valid UTF-8
70	Ok({	32✔
71	unsafe {	32✔
72	#[allow(clippy::transmute_bytes_to_str)]	32✔
73	core::mem::transmute::<&'_ [u8], &'_ str>(slice)	32✔
74	}
75	})
76	}
77	}
78
79	unsafe impl CopyType for Box<str> {
80	type Copy = Deep;
81	}
82
83	impl TypeHash for Box<str> {
84	fn type_hash(hasher: &mut impl core::hash::Hasher) {	41✔
85	"Box<str>".hash(hasher);	123✔
86	}
87	}
88
89	impl AlignHash for Box<str> {
90	fn align_hash(_hasher: &mut impl core::hash::Hasher, _offset_of: &mut usize) {}	88✔
91	}
92
93	impl SerInner for Box<str> {
94	type SerType = Self;
95	// Box<[$ty]> can, but Vec<Box<[$ty]>> cannot!
96	const IS_ZERO_COPY: bool = false;
97
98	unsafe fn _ser_inner(&self, backend: &mut impl WriteWithNames) -> ser::Result<()> {	2✔
99	ser_slice_zero(backend, self.as_bytes())	6✔
100	}
101	}
102
103	impl DeserInner for Box<str> {
NEW 104	fn __check_covariance<'__long: '__short, '__short>(	×
105	p: deser::CovariantProof<Self::DeserType<'__long>>,
106	) -> deser::CovariantProof<Self::DeserType<'__short>> {
NEW 107	p	×
108	}
109	#[inline(always)]
110	unsafe fn _deser_full_inner(backend: &mut impl ReadWithPos) -> deser::Result<Self> {	4✔
111	Ok(unsafe { String::_deser_full_inner(backend) }?.into_boxed_str())	12✔
112	}
113
114	type DeserType<'a> = &'a str;
115
116	#[inline(always)]
117	unsafe fn _deser_eps_inner<'a>(	6✔
118	backend: &mut SliceWithPos<'a>,
119	) -> deser::Result<Self::DeserType<'a>> {
120	unsafe { String::_deser_eps_inner(backend) }	12✔
121	}
122	}
123
124	// For use with PhantomData
125	impl TypeHash for str {
126	fn type_hash(hasher: &mut impl core::hash::Hasher) {	1✔
127	"str".hash(hasher);	3✔
128	}
129	}
130
131	// For use with PhantomData
132	impl TypeHash for &str {
133	fn type_hash(hasher: &mut impl core::hash::Hasher) {	×
134	"&str".hash(hasher);	×
135	}
136	}
137	unsafe impl CopyType for &str {
138	type Copy = Deep;
139	}
140
141	impl SerInner for &str {
142	type SerType = Box<str>;
143	const IS_ZERO_COPY: bool = false;
144
145	unsafe fn _ser_inner(&self, backend: &mut impl WriteWithNames) -> ser::Result<()> {	336✔
146	ser_slice_zero(backend, self.as_bytes())	1,008✔
147	}
148	}

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