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Remove cargo nsstring component

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Part 3 for #58
This commit is contained in:
wolfbeast 2018-03-13 12:15:45 +01:00 • committed by Roy Tam
commit 5983fef8c5
13 changed files with 0 additions and 1150 deletions
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11
toolkit/library/gtest/rust/Cargo.lock generated
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@ -38,17 +38,6 @@ name = "matches"
version = "0.1.3" version = "0.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "nsstring"
version = "0.1.0"
[[package]]
name = "nsstring-gtest"
version = "0.1.0"
dependencies = [
"nsstring 0.1.0",
]
[[package]] [[package]]
name = "unicode-bidi" name = "unicode-bidi"
version = "0.2.3" version = "0.2.3"

1
toolkit/library/gtest/rust/Cargo.toml
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@ -6,7 +6,6 @@ license = "MPL-2.0"
description = "Testing code for libgkrust" description = "Testing code for libgkrust"
[dependencies] [dependencies]
nsstring-gtest = { path = "../../../../xpcom/rust/nsstring/gtest" }
gkrust-shared = { path = "../../rust/shared" } gkrust-shared = { path = "../../rust/shared" }
[lib] [lib]

1
toolkit/library/gtest/rust/lib.rs
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@ -3,4 +3,3 @@
// file, You can obtain one at http://mozilla.org/MPL/2.0/. // file, You can obtain one at http://mozilla.org/MPL/2.0/.
extern crate gkrust_shared; extern crate gkrust_shared;
extern crate nsstring_gtest;

4
toolkit/library/rust/Cargo.lock generated
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@ -37,10 +37,6 @@ name = "matches"
version = "0.1.3" version = "0.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
[[package]]
name = "nsstring"
version = "0.1.0"
[[package]] [[package]]
name = "unicode-bidi" name = "unicode-bidi"
version = "0.2.3" version = "0.2.3"

3
toolkit/library/rust/shared/Cargo.toml
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@ -5,9 +5,6 @@ authors = ["nobody@mozilla.org"]
license = "MPL-2.0" license = "MPL-2.0"
description = "Shared Rust code for libxul" description = "Shared Rust code for libxul"
[dependencies]
nsstring = { path = "../../../../xpcom/rust/nsstring" }
[lib] [lib]
path = "lib.rs" path = "lib.rs"
test = false test = false

1
toolkit/library/rust/shared/lib.rs
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@ -2,4 +2,3 @@
// License, v. 2.0. If a copy of the MPL was not distributed with this // License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/. // file, You can obtain one at http://mozilla.org/MPL/2.0/.
extern crate nsstring;

1
xpcom/moz.build
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@ -31,7 +31,6 @@ if CONFIG['OS_ARCH'] == 'WINNT' and CONFIG['MOZ_DEBUG']:
TEST_DIRS += [ TEST_DIRS += [
'tests', 'tests',
'rust/nsstring/gtest',
] ]
# Can't build internal xptcall tests that use symbols which are not exported. # Can't build internal xptcall tests that use symbols which are not exported.

8
xpcom/rust/nsstring/Cargo.toml
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@ -1,8 +0,0 @@
[package]
name = "nsstring"
version = "0.1.0"
authors = ["nobody@mozilla.com"]
license = "MPL-2.0"
description = "Rust bindings to xpcom string types"
[dependencies]

12
xpcom/rust/nsstring/gtest/Cargo.toml
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@ -1,12 +0,0 @@
[package]
name = "nsstring-gtest"
version = "0.1.0"
authors = ["nobody@mozilla.com"]
license = "MPL-2.0"
description = "Tests for rust bindings to xpcom string types"
[dependencies]
nsstring = { path = "../" }
[lib]
path = "test.rs"

131
xpcom/rust/nsstring/gtest/Test.cpp
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@ -1,131 +0,0 @@
#include "gtest/gtest.h"
#include <stdint.h>
#include "nsString.h"
extern "C" {
// This function is called by the rust code in test.rs if a non-fatal test
// failure occurs.
void GTest_ExpectFailure(const char* aMessage) {
EXPECT_STREQ(aMessage, "");
}
}
#define SIZE_ALIGN_CHECK(Clazz) \
extern "C" void Rust_Test_ReprSizeAlign_##Clazz(size_t* size, size_t* align); \
TEST(RustNsString, ReprSizeAlign_##Clazz) { \
size_t size, align; \
Rust_Test_ReprSizeAlign_##Clazz(&size, &align); \
EXPECT_EQ(size, sizeof(Clazz)); \
EXPECT_EQ(align, alignof(Clazz)); \
}
SIZE_ALIGN_CHECK(nsString)
SIZE_ALIGN_CHECK(nsCString)
SIZE_ALIGN_CHECK(nsFixedString)
SIZE_ALIGN_CHECK(nsFixedCString)
#define MEMBER_CHECK(Clazz, Member) \
extern "C" void Rust_Test_Member_##Clazz##_##Member(size_t* size, \
size_t* align, \
size_t* offset); \
TEST(RustNsString, ReprMember_##Clazz##_##Member) { \
class Hack : public Clazz { \
public: \
static void RunTest() { \
size_t size, align, offset; \
Rust_Test_Member_##Clazz##_##Member(&size, &align, &offset); \
EXPECT_EQ(size, sizeof(mozilla::DeclVal<Hack>().Member)); \
EXPECT_EQ(size, alignof(decltype(mozilla::DeclVal<Hack>().Member))); \
EXPECT_EQ(offset, offsetof(Hack, Member)); \
} \
}; \
static_assert(sizeof(Clazz) == sizeof(Hack), "Hack matches class"); \
Hack::RunTest(); \
}
MEMBER_CHECK(nsString, mData)
MEMBER_CHECK(nsString, mLength)
MEMBER_CHECK(nsString, mFlags)
MEMBER_CHECK(nsCString, mData)
MEMBER_CHECK(nsCString, mLength)
MEMBER_CHECK(nsCString, mFlags)
MEMBER_CHECK(nsFixedString, mFixedCapacity)
MEMBER_CHECK(nsFixedString, mFixedBuf)
MEMBER_CHECK(nsFixedCString, mFixedCapacity)
MEMBER_CHECK(nsFixedCString, mFixedBuf)
extern "C" void Rust_Test_NsStringFlags(uint32_t* f_none,
uint32_t* f_terminated,
uint32_t* f_voided,
uint32_t* f_shared,
uint32_t* f_owned,
uint32_t* f_fixed,
uint32_t* f_literal,
uint32_t* f_class_fixed);
TEST(RustNsString, NsStringFlags) {
uint32_t f_none, f_terminated, f_voided, f_shared, f_owned, f_fixed, f_literal, f_class_fixed;
Rust_Test_NsStringFlags(&f_none, &f_terminated,
&f_voided, &f_shared,
&f_owned, &f_fixed,
&f_literal, &f_class_fixed);
EXPECT_EQ(f_none, nsAString::F_NONE);
EXPECT_EQ(f_none, nsACString::F_NONE);
EXPECT_EQ(f_terminated, nsAString::F_TERMINATED);
EXPECT_EQ(f_terminated, nsACString::F_TERMINATED);
EXPECT_EQ(f_voided, nsAString::F_VOIDED);
EXPECT_EQ(f_voided, nsACString::F_VOIDED);
EXPECT_EQ(f_shared, nsAString::F_SHARED);
EXPECT_EQ(f_shared, nsACString::F_SHARED);
EXPECT_EQ(f_owned, nsAString::F_OWNED);
EXPECT_EQ(f_owned, nsACString::F_OWNED);
EXPECT_EQ(f_fixed, nsAString::F_FIXED);
EXPECT_EQ(f_fixed, nsACString::F_FIXED);
EXPECT_EQ(f_literal, nsAString::F_LITERAL);
EXPECT_EQ(f_literal, nsACString::F_LITERAL);
EXPECT_EQ(f_class_fixed, nsAString::F_CLASS_FIXED);
EXPECT_EQ(f_class_fixed, nsACString::F_CLASS_FIXED);
}
extern "C" void Rust_StringFromCpp(const nsACString* aCStr, const nsAString* aStr);
TEST(RustNsString, StringFromCpp) {
nsAutoCString foo;
foo.AssignASCII("Hello, World!");
nsAutoString bar;
bar.AssignASCII("Hello, World!");
Rust_StringFromCpp(&foo, &bar);
}
extern "C" void Rust_AssignFromRust(nsACString* aCStr, nsAString* aStr);
TEST(RustNsString, AssignFromRust) {
nsAutoCString cs;
nsAutoString s;
Rust_AssignFromRust(&cs, &s);
EXPECT_TRUE(cs.EqualsASCII("Hello, World!"));
EXPECT_TRUE(s.EqualsASCII("Hello, World!"));
}
extern "C" {
void Cpp_AssignFromCpp(nsACString* aCStr, nsAString* aStr) {
aCStr->AssignASCII("Hello, World!");
aStr->AssignASCII("Hello, World!");
}
}
extern "C" void Rust_AssignFromCpp();
TEST(RustNsString, AssignFromCpp) {
Rust_AssignFromCpp();
}
extern "C" void Rust_FixedAssignFromCpp();
TEST(RustNsString, FixedAssignFromCpp) {
Rust_FixedAssignFromCpp();
}
extern "C" void Rust_AutoAssignFromCpp();
TEST(RustNsString, AutoAssignFromCpp) {
Rust_AutoAssignFromCpp();
}
extern "C" void Rust_StringWrite();
TEST(RustNsString, StringWrite) {
Rust_StringWrite();
}

12
xpcom/rust/nsstring/gtest/moz.build
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@ -1,12 +0,0 @@
# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
# vim: set filetype=python:
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
if CONFIG['MOZ_RUST']:
UNIFIED_SOURCES += [
'Test.cpp'
]
FINAL_LIBRARY = 'xul-gtest'

112
xpcom/rust/nsstring/gtest/test.rs
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@ -1,112 +0,0 @@
#![allow(non_snake_case)]
#[macro_use]
extern crate nsstring;
use std::fmt::Write;
use std::ffi::CString;
use std::os::raw::c_char;
use nsstring::*;
fn nonfatal_fail(msg: String) {
extern "C" {
fn GTest_ExpectFailure(message: *const c_char);
}
unsafe {
GTest_ExpectFailure(CString::new(msg).unwrap().as_ptr());
}
}
/// This macro checks if the two arguments are equal, and causes a non-fatal
/// GTest test failure if they are not.
macro_rules! expect_eq {
($x:expr, $y:expr) => {
match (&$x, &$y) {
(x, y) => if *x != *y {
nonfatal_fail(format!("check failed: (`{:?}` == `{:?}`) at {}:{}",
x, y, file!(), line!()))
}
}
}
}
#[no_mangle]
pub extern fn Rust_StringFromCpp(cs: *const nsACString, s: *const nsAString) {
unsafe {
expect_eq!(&*cs, "Hello, World!");
expect_eq!(&*s, "Hello, World!");
}
}
#[no_mangle]
pub extern fn Rust_AssignFromRust(cs: *mut nsACString, s: *mut nsAString) {
unsafe {
(*cs).assign(&nsCString::from("Hello, World!"));
expect_eq!(&*cs, "Hello, World!");
(*s).assign(&nsString::from("Hello, World!"));
expect_eq!(&*s, "Hello, World!");
}
}
extern "C" {
fn Cpp_AssignFromCpp(cs: *mut nsACString, s: *mut nsAString);
}
#[no_mangle]
pub extern fn Rust_AssignFromCpp() {
let mut cs = nsCString::new();
let mut s = nsString::new();
unsafe {
Cpp_AssignFromCpp(&mut *cs, &mut *s);
}
expect_eq!(cs, "Hello, World!");
expect_eq!(s, "Hello, World!");
}
#[no_mangle]
pub extern fn Rust_FixedAssignFromCpp() {
let mut cs_buf: [u8; 64] = [0; 64];
let cs_buf_ptr = &cs_buf as *const _ as usize;
let mut s_buf: [u16; 64] = [0; 64];
let s_buf_ptr = &s_buf as *const _ as usize;
let mut cs = nsFixedCString::new(&mut cs_buf);
let mut s = nsFixedString::new(&mut s_buf);
unsafe {
Cpp_AssignFromCpp(&mut *cs, &mut *s);
}
expect_eq!(cs, "Hello, World!");
expect_eq!(s, "Hello, World!");
expect_eq!(cs.as_ptr() as usize, cs_buf_ptr);
expect_eq!(s.as_ptr() as usize, s_buf_ptr);
}
#[no_mangle]
pub extern fn Rust_AutoAssignFromCpp() {
ns_auto_cstring!(cs);
ns_auto_string!(s);
unsafe {
Cpp_AssignFromCpp(&mut *cs, &mut *s);
}
expect_eq!(cs, "Hello, World!");
expect_eq!(s, "Hello, World!");
}
#[no_mangle]
pub extern fn Rust_StringWrite() {
ns_auto_cstring!(cs);
ns_auto_string!(s);
write!(s, "a").unwrap();
write!(cs, "a").unwrap();
expect_eq!(s, "a");
expect_eq!(cs, "a");
write!(s, "bc").unwrap();
write!(cs, "bc").unwrap();
expect_eq!(s, "abc");
expect_eq!(cs, "abc");
write!(s, "{}", 123).unwrap();
write!(cs, "{}", 123).unwrap();
expect_eq!(s, "abc123");
expect_eq!(cs, "abc123");
}

853
xpcom/rust/nsstring/src/lib.rs
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@ -1,853 +0,0 @@
//! This module provides rust bindings for the XPCOM string types.
//!
//! # TL;DR (what types should I use)
//!
//! Use `&{mut,} nsA[C]String` for functions in rust which wish to take or
//! mutate XPCOM strings. The other string types `Deref` to this type.
//!
//! Use `ns[C]String<'a>` for string struct members which don't leave rust, and
//! as an intermediate between rust string data structures (such as `String`,
//! `Vec<u16>`, `&str`, and `&[u16]`) and `&{mut,} nsA[C]String` (using
//! `ns[C]String::from(value)`). These conversions, when possible, will not
//! perform any allocations.
//!
//! Use `nsFixed[C]String` or `ns_auto_[c]string!` for dynamic stack allocated
//! strings which are expected to hold short string values.
//!
//! Use `*{const,mut} nsA[C]String` (`{const,} nsA[C]String*` in C++) for
//! function arguments passed across the rust/C++ language boundary.
//!
//! Use `ns[C]StringRepr` for string struct members which are shared between
//! rust and C++, but be careful, because this type lacks a `Drop`
//! implementation.
//!
//! # String Types
//!
//! ## `nsA[C]String`
//!
//! The core types in this module are `nsAString` and `nsACString`. These types
//! are zero-sized as far as rust is concerned, and are safe to pass around
//! behind both references (in rust code), and pointers (in C++ code). They
//! represent a handle to a XPCOM string which holds either `u16` or `u8`
//! characters respectively. The backing character buffer is guaranteed to live
//! as long as the reference to the `nsAString` or `nsACString`.
//!
//! These types in rust are simply used as dummy types. References to them
//! represent a pointer to the beginning of a variable-sized `#[repr(C)]` struct
//! which is common between both C++ and Rust implementations. In C++, their
//! corresponding types are also named `nsAString` or `nsACString`, and they are
//! defined within the `nsTSubstring.{cpp,h}` file.
//!
//! ### Valid Operations
//!
//! An `&nsA[C]String` acts like rust's `&str`, in that it is a borrowed
//! reference to the backing data. When used as an argument to other functions
//! on `&mut nsA[C]String`, optimizations can be performed to avoid copying
//! buffers, as information about the backing storage is preserved.
//!
//! An `&mut nsA[C]String` acts like rust's `&mut Cow<str>`, in that it is a
//! mutable reference to a potentially borrowed string, which when modified will
//! ensure that it owns its own backing storage. This type can be appended to
//! with the methods `.append`, `.append_utf{8,16}`, and with the `write!`
//! macro, and can be assigned to with `.assign`.
//!
//! ## `ns[C]String<'a>`
//!
//! This type is an maybe-owned string type. It acts similarially to a
//! `Cow<[{u8,u16}]>`. This type provides `Deref` and `DerefMut` implementations
//! to `nsA[C]String`, which provides the methods for manipulating this type.
//! This type's lifetime parameter, `'a`, represents the lifetime of the backing
//! storage. When modified this type may re-allocate in order to ensure that it
//! does not mutate its backing storage.
//!
//! `ns[C]String`s can be constructed either with `ns[C]String::new()`, which
//! creates an empty `ns[C]String<'static>`, or through one of the provided
//! `From` implementations. Both string types may be constructed `From<&'a
//! str>`, with `nsCString` having a `'a` lifetime, as the storage is shared
//! with the `str`, while `nsString` has a `'static` lifetime, as its storage
//! has to be transcoded.
//!
//! When passing this type by reference, prefer passing a `&nsA[C]String` or
//! `&mut nsA[C]String`. to passing this type.
//!
//! This type is _not_ `#[repr(C)]`, as it has a `Drop` impl, which in versions
//! of `rustc < 1.13` adds drop flags to the struct, which messes up the layout,
//! making it unsafe to pass across the FFI boundary. The rust compiler will
//! warn if this type appears in `extern "C"` function definitions.
//!
//! When passing this type across the language boundary, pass it as `*const
//! nsA[C]String` for an immutable reference, or `*mut nsA[C]String` for a
//! mutable reference.
//!
//! This type is similar to the C++ type of the same name.
//!
//! ## `nsFixed[C]String<'a>`
//!
//! This type is a string type with fixed backing storage. It is created with
//! `nsFixed[C]String::new(buffer)`, passing a mutable reference to a buffer as
//! the argument. This buffer will be used as backing storage whenever the
//! resulting string will fit within it, falling back to heap allocations only
//! when the string size exceeds that of the backing buffer.
//!
//! Like `ns[C]String`, this type dereferences to `nsA[C]String` which provides
//! the methods for manipulating the type, and is not `#[repr(C)]`.
//!
//! When passing this type by reference, prefer passing a `&nsA[C]String` or
//! `&mut nsA[C]String`. to passing this type.
//!
//! This type is _not_ `#[repr(C)]`, as it has a `Drop` impl, which in versions
//! of `rustc < 1.13` adds drop flags to the struct, which messes up the layout,
//! making it unsafe to pass across the FFI boundary. The rust compiler will
//! warn if this type appears in `extern "C"` function definitions.
//!
//! When passing this type across the language boundary, pass it as `*const
//! nsA[C]String` for an immutable reference, or `*mut nsA[C]String` for a
//! mutable reference.
//!
//! This type is similar to the C++ type of the same name.
//!
//! ## `ns_auto_[c]string!($name)`
//!
//! This is a helper macro which defines a fixed size, (currently 64 character),
//! backing array on the stack, and defines a local variable with name `$name`
//! which is a `nsFixed[C]String` using this buffer as its backing storage.
//!
//! Usage of this macro is similar to the C++ type `nsAuto[C]String`, but could
//! not be implemented as a basic type due to the differences between rust and
//! C++'s move semantics.
//!
//! ## `ns[C]StringRepr`
//!
//! This type represents a C++ `ns[C]String`. This type is `#[repr(C)]` and is
//! safe to use in struct definitions which are shared across the language
//! boundary. It automatically dereferences to `&{mut,} nsA[C]String`, and thus
//! can be treated similarially to `ns[C]String`.
//!
//! If this type is dropped in rust, it will not free its backing storage. This
//! is because types implementing `Drop` have a drop flag added, which messes up
//! the layout of this type. When drop flags are removed, which should happen in
//! `rustc 1.13` (see rust-lang/rust#35764), this type will likely be removed,
//! and replaced with direct usage of `ns[C]String<'a>`, as its layout may be
//! identical. This module provides rust bindings to our xpcom ns[C]String
//! types.
#![allow(non_camel_case_types)]
use std::ops::{Deref, DerefMut};
use std::marker::PhantomData;
use std::slice;
use std::ptr;
use std::mem;
use std::fmt;
use std::cmp;
use std::str;
use std::u32;
//////////////////////////////////
// Internal Implemenation Flags //
//////////////////////////////////
const F_NONE: u32 = 0; // no flags
// data flags are in the lower 16-bits
const F_TERMINATED: u32 = 1 << 0; // IsTerminated returns true
const F_VOIDED: u32 = 1 << 1; // IsVoid returns true
const F_SHARED: u32 = 1 << 2; // mData points to a heap-allocated, shared buffer
const F_OWNED: u32 = 1 << 3; // mData points to a heap-allocated, raw buffer
const F_FIXED: u32 = 1 << 4; // mData points to a fixed-size writable, dependent buffer
const F_LITERAL: u32 = 1 << 5; // mData points to a string literal; F_TERMINATED will also be set
// class flags are in the upper 16-bits
const F_CLASS_FIXED: u32 = 1 << 16; // indicates that |this| is of type nsTFixedString
////////////////////////////////////
// Generic String Bindings Macros //
////////////////////////////////////
macro_rules! define_string_types {
{
char_t = $char_t: ty;
AString = $AString: ident;
String = $String: ident;
FixedString = $FixedString: ident;
StringRepr = $StringRepr: ident;
FixedStringRepr = $FixedStringRepr: ident;
AutoStringRepr = $AutoStringRepr: ident;
} => {
/// The representation of a ns[C]String type in C++. This type is
/// used internally by our definition of ns[C]String to ensure layout
/// compatibility with the C++ ns[C]String type.
///
/// This type may also be used in place of a C++ ns[C]String inside of
/// struct definitions which are shared with C++, as it has identical
/// layout to our ns[C]String type. Due to drop flags, our ns[C]String
/// type does not have identical layout. When drop flags are removed,
/// this type will likely be made a private implementation detail, and
/// its uses will be replaced with `ns[C]String`.
///
/// This struct will leak its data if dropped from rust. See the module
/// documentation for more information on this type.
#[repr(C)]
pub struct $StringRepr {
data: *const $char_t,
length: u32,
flags: u32,
}
impl Deref for $StringRepr {
type Target = $AString;
fn deref(&self) -> &$AString {
unsafe {
mem::transmute(self)
}
}
}
impl DerefMut for $StringRepr {
fn deref_mut(&mut self) -> &mut $AString {
unsafe {
mem::transmute(self)
}
}
}
/// The representation of a nsFixed[C]String type in C++. This type is
/// used internally by our definition of nsFixed[C]String to ensure layout
/// compatibility with the C++ nsFixed[C]String type.
#[repr(C)]
struct $FixedStringRepr {
base: $StringRepr,
capacity: u32,
buffer: *mut $char_t,
}
/// This type is the abstract type which is used for interacting with
/// strings in rust. Each string type can derefence to an instance of
/// this type, which provides the useful operations on strings.
///
/// NOTE: Rust thinks this type has a size of 0, because the data
/// associated with it is not necessarially safe to move. It is not safe
/// to construct a nsAString yourself, unless it is received by
/// dereferencing one of these types.
///
/// NOTE: The `[u8; 0]` member is zero sized, and only exists to prevent
/// the construction by code outside of this module. It is used instead
/// of a private `()` member because the `improper_ctypes` lint complains
/// about some ZST members in `extern "C"` function declarations.
#[repr(C)]
pub struct $AString {
_prohibit_constructor: [u8; 0],
}
impl Deref for $AString {
type Target = [$char_t];
fn deref(&self) -> &[$char_t] {
unsafe {
// This is legal, as all $AString values actually point to a
// $StringRepr
let this: &$StringRepr = mem::transmute(self);
if this.data.is_null() {
debug_assert!(this.length == 0);
// Use an arbitrary non-null value as the pointer
slice::from_raw_parts(0x1 as *const $char_t, 0)
} else {
slice::from_raw_parts(this.data, this.length as usize)
}
}
}
}
impl cmp::PartialEq for $AString {
fn eq(&self, other: &$AString) -> bool {
&self[..] == &other[..]
}
}
impl cmp::PartialEq<[$char_t]> for $AString {
fn eq(&self, other: &[$char_t]) -> bool {
&self[..] == other
}
}
impl<'a> cmp::PartialEq<$String<'a>> for $AString {
fn eq(&self, other: &$String<'a>) -> bool {
self.eq(&**other)
}
}
impl<'a> cmp::PartialEq<$FixedString<'a>> for $AString {
fn eq(&self, other: &$FixedString<'a>) -> bool {
self.eq(&**other)
}
}
pub struct $String<'a> {
hdr: $StringRepr,
_marker: PhantomData<&'a [$char_t]>,
}
impl $String<'static> {
pub fn new() -> $String<'static> {
$String {
hdr: $StringRepr {
data: ptr::null(),
length: 0,
flags: F_NONE,
},
_marker: PhantomData,
}
}
}
impl<'a> Deref for $String<'a> {
type Target = $AString;
fn deref(&self) -> &$AString {
&self.hdr
}
}
impl<'a> DerefMut for $String<'a> {
fn deref_mut(&mut self) -> &mut $AString {
&mut self.hdr
}
}
impl<'a> From<&'a String> for $String<'a> {
fn from(s: &'a String) -> $String<'a> {
$String::from(&s[..])
}
}
impl<'a> From<&'a Vec<$char_t>> for $String<'a> {
fn from(s: &'a Vec<$char_t>) -> $String<'a> {
$String::from(&s[..])
}
}
impl<'a> From<&'a [$char_t]> for $String<'a> {
fn from(s: &'a [$char_t]) -> $String<'a> {
assert!(s.len() < (u32::MAX as usize));
$String {
hdr: $StringRepr {
data: s.as_ptr(),
length: s.len() as u32,
flags: F_NONE,
},
_marker: PhantomData,
}
}
}
impl From<Box<[$char_t]>> for $String<'static> {
fn from(s: Box<[$char_t]>) -> $String<'static> {
assert!(s.len() < (u32::MAX as usize));
// SAFETY NOTE: This method produces an F_OWNED ns[C]String from
// a Box<[$char_t]>. this is only safe because in the Gecko
// tree, we use the same allocator for Rust code as for C++
// code, meaning that our box can be legally freed with
// libc::free().
let length = s.len() as u32;
let ptr = s.as_ptr();
mem::forget(s);
$String {
hdr: $StringRepr {
data: ptr,
length: length,
flags: F_OWNED,
},
_marker: PhantomData,
}
}
}
impl From<Vec<$char_t>> for $String<'static> {
fn from(s: Vec<$char_t>) -> $String<'static> {
s.into_boxed_slice().into()
}
}
impl<'a> From<&'a $AString> for $String<'static> {
fn from(s: &'a $AString) -> $String<'static> {
let mut string = $String::new();
string.assign(s);
string
}
}
impl<'a> fmt::Write for $String<'a> {
fn write_str(&mut self, s: &str) -> Result<(), fmt::Error> {
$AString::write_str(self, s)
}
}
impl<'a> fmt::Display for $String<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
<$AString as fmt::Display>::fmt(self, f)
}
}
impl<'a> fmt::Debug for $String<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
<$AString as fmt::Debug>::fmt(self, f)
}
}
impl<'a> cmp::PartialEq for $String<'a> {
fn eq(&self, other: &$String<'a>) -> bool {
$AString::eq(self, other)
}
}
impl<'a> cmp::PartialEq<[$char_t]> for $String<'a> {
fn eq(&self, other: &[$char_t]) -> bool {
$AString::eq(self, other)
}
}
impl<'a, 'b> cmp::PartialEq<&'b [$char_t]> for $String<'a> {
fn eq(&self, other: &&'b [$char_t]) -> bool {
$AString::eq(self, *other)
}
}
impl<'a> cmp::PartialEq<str> for $String<'a> {
fn eq(&self, other: &str) -> bool {
$AString::eq(self, other)
}
}
impl<'a, 'b> cmp::PartialEq<&'b str> for $String<'a> {
fn eq(&self, other: &&'b str) -> bool {
$AString::eq(self, *other)
}
}
impl<'a> Drop for $String<'a> {
fn drop(&mut self) {
unsafe {
self.finalize();
}
}
}
/// A nsFixed[C]String is a string which uses a fixed size mutable
/// backing buffer for storing strings which will fit within that
/// buffer, rather than using heap allocations.
pub struct $FixedString<'a> {
hdr: $FixedStringRepr,
_marker: PhantomData<&'a mut [$char_t]>,
}
impl<'a> $FixedString<'a> {
pub fn new(buf: &'a mut [$char_t]) -> $FixedString<'a> {
let len = buf.len();
assert!(len < (u32::MAX as usize));
let buf_ptr = buf.as_mut_ptr();
$FixedString {
hdr: $FixedStringRepr {
base: $StringRepr {
data: ptr::null(),
length: 0,
flags: F_CLASS_FIXED,
},
capacity: len as u32,
buffer: buf_ptr,
},
_marker: PhantomData,
}
}
}
impl<'a> Deref for $FixedString<'a> {
type Target = $AString;
fn deref(&self) -> &$AString {
&self.hdr.base
}
}
impl<'a> DerefMut for $FixedString<'a> {
fn deref_mut(&mut self) -> &mut $AString {
&mut self.hdr.base
}
}
impl<'a> fmt::Write for $FixedString<'a> {
fn write_str(&mut self, s: &str) -> Result<(), fmt::Error> {
$AString::write_str(self, s)
}
}
impl<'a> fmt::Display for $FixedString<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
<$AString as fmt::Display>::fmt(self, f)
}
}
impl<'a> fmt::Debug for $FixedString<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
<$AString as fmt::Debug>::fmt(self, f)
}
}
impl<'a> cmp::PartialEq for $FixedString<'a> {
fn eq(&self, other: &$FixedString<'a>) -> bool {
$AString::eq(self, other)
}
}
impl<'a> cmp::PartialEq<[$char_t]> for $FixedString<'a> {
fn eq(&self, other: &[$char_t]) -> bool {
$AString::eq(self, other)
}
}
impl<'a, 'b> cmp::PartialEq<&'b [$char_t]> for $FixedString<'a> {
fn eq(&self, other: &&'b [$char_t]) -> bool {
$AString::eq(self, *other)
}
}
impl<'a> cmp::PartialEq<str> for $FixedString<'a> {
fn eq(&self, other: &str) -> bool {
$AString::eq(self, other)
}
}
impl<'a, 'b> cmp::PartialEq<&'b str> for $FixedString<'a> {
fn eq(&self, other: &&'b str) -> bool {
$AString::eq(self, *other)
}
}
impl<'a> Drop for $FixedString<'a> {
fn drop(&mut self) {
unsafe {
self.finalize();
}
}
}
}
}
///////////////////////////////////////////
// Bindings for nsCString (u8 char type) //
///////////////////////////////////////////
define_string_types! {
char_t = u8;
AString = nsACString;
String = nsCString;
FixedString = nsFixedCString;
StringRepr = nsCStringRepr;
FixedStringRepr = nsFixedCStringRepr;
AutoStringRepr = nsAutoCStringRepr;
}
impl nsACString {
/// Leaves the nsACString in an unstable state with a dangling data pointer.
/// Should only be used in drop implementations of rust types which wrap
/// this type.
unsafe fn finalize(&mut self) {
Gecko_FinalizeCString(self);
}
pub fn assign(&mut self, other: &nsACString) {
unsafe {
Gecko_AssignCString(self as *mut _, other as *const _);
}
}
pub fn assign_utf16(&mut self, other: &nsAString) {
self.assign(&nsCString::new());
self.append_utf16(other);
}
pub fn append(&mut self, other: &nsACString) {
unsafe {
Gecko_AppendCString(self as *mut _, other as *const _);
}
}
pub fn append_utf16(&mut self, other: &nsAString) {
unsafe {
Gecko_AppendUTF16toCString(self as *mut _, other as *const _);
}
}
pub unsafe fn as_str_unchecked(&self) -> &str {
str::from_utf8_unchecked(self)
}
}
impl<'a> From<&'a str> for nsCString<'a> {
fn from(s: &'a str) -> nsCString<'a> {
s.as_bytes().into()
}
}
impl From<Box<str>> for nsCString<'static> {
fn from(s: Box<str>) -> nsCString<'static> {
s.into_string().into()
}
}
impl From<String> for nsCString<'static> {
fn from(s: String) -> nsCString<'static> {
s.into_bytes().into()
}
}
// Support for the write!() macro for appending to nsACStrings
impl fmt::Write for nsACString {
fn write_str(&mut self, s: &str) -> Result<(), fmt::Error> {
self.append(&nsCString::from(s));
Ok(())
}
}
impl fmt::Display for nsACString {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
fmt::Display::fmt(&String::from_utf8_lossy(&self[..]), f)
}
}
impl fmt::Debug for nsACString {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
fmt::Debug::fmt(&String::from_utf8_lossy(&self[..]), f)
}
}
impl cmp::PartialEq<str> for nsACString {
fn eq(&self, other: &str) -> bool {
&self[..] == other.as_bytes()
}
}
#[macro_export]
macro_rules! ns_auto_cstring {
($name:ident) => {
let mut buf: [u8; 64] = [0; 64];
let mut $name = $crate::nsFixedCString::new(&mut buf);
}
}
///////////////////////////////////////////
// Bindings for nsString (u16 char type) //
///////////////////////////////////////////
define_string_types! {
char_t = u16;
AString = nsAString;
String = nsString;
FixedString = nsFixedString;
StringRepr = nsStringRepr;
FixedStringRepr = nsFixedStringRepr;
AutoStringRepr = nsAutoStringRepr;
}
impl nsAString {
/// Leaves the nsAString in an unstable state with a dangling data pointer.
/// Should only be used in drop implementations of rust types which wrap
/// this type.
unsafe fn finalize(&mut self) {
Gecko_FinalizeString(self);
}
pub fn assign(&mut self, other: &nsAString) {
unsafe {
Gecko_AssignString(self as *mut _, other as *const _);
}
}
pub fn assign_utf8(&mut self, other: &nsACString) {
self.assign(&nsString::new());
self.append_utf8(other);
}
pub fn append(&mut self, other: &nsAString) {
unsafe {
Gecko_AppendString(self as *mut _, other as *const _);
}
}
pub fn append_utf8(&mut self, other: &nsACString) {
unsafe {
Gecko_AppendUTF8toString(self as *mut _, other as *const _);
}
}
}
// NOTE: The From impl for a string slice for nsString produces a <'static>
// lifetime, as it allocates.
impl<'a> From<&'a str> for nsString<'static> {
fn from(s: &'a str) -> nsString<'static> {
s.encode_utf16().collect::<Vec<u16>>().into()
}
}
// Support for the write!() macro for writing to nsStrings
impl fmt::Write for nsAString {
fn write_str(&mut self, s: &str) -> Result<(), fmt::Error> {
// Directly invoke gecko's routines for appending utf8 strings to
// nsAString values, to avoid as much overhead as possible
self.append_utf8(&nsCString::from(s));
Ok(())
}
}
impl fmt::Display for nsAString {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
fmt::Display::fmt(&String::from_utf16_lossy(&self[..]), f)
}
}
impl fmt::Debug for nsAString {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
fmt::Debug::fmt(&String::from_utf16_lossy(&self[..]), f)
}
}
impl cmp::PartialEq<str> for nsAString {
fn eq(&self, other: &str) -> bool {
other.encode_utf16().eq(self.iter().cloned())
}
}
#[macro_export]
macro_rules! ns_auto_string {
($name:ident) => {
let mut buf: [u16; 64] = [0; 64];
let mut $name = $crate::nsFixedString::new(&mut buf);
}
}
// NOTE: These bindings currently only expose infallible operations. Perhaps
// consider allowing for fallible methods?
extern "C" {
// Gecko implementation in nsSubstring.cpp
fn Gecko_FinalizeCString(this: *mut nsACString);
fn Gecko_AssignCString(this: *mut nsACString, other: *const nsACString);
fn Gecko_AppendCString(this: *mut nsACString, other: *const nsACString);
fn Gecko_FinalizeString(this: *mut nsAString);
fn Gecko_AssignString(this: *mut nsAString, other: *const nsAString);
fn Gecko_AppendString(this: *mut nsAString, other: *const nsAString);
// Gecko implementation in nsReadableUtils.cpp
fn Gecko_AppendUTF16toCString(this: *mut nsACString, other: *const nsAString);
fn Gecko_AppendUTF8toString(this: *mut nsAString, other: *const nsACString);
}
//////////////////////////////////////
// Repr Validation Helper Functions //
//////////////////////////////////////
pub mod test_helpers {
//! This module only exists to help with ensuring that the layout of the
//! structs inside of rust and C++ are identical.
//!
//! It is public to ensure that these testing functions are avaliable to
//! gtest code.
use super::{
nsFixedCStringRepr,
nsFixedStringRepr,
nsCStringRepr,
nsStringRepr,
F_NONE,
F_TERMINATED,
F_VOIDED,
F_SHARED,
F_OWNED,
F_FIXED,
F_LITERAL,
F_CLASS_FIXED,
};
use std::mem;
/// Generates an #[no_mangle] extern "C" function which returns the size and
/// alignment of the given type with the given name.
macro_rules! size_align_check {
($T:ty, $fname:ident) => {
#[no_mangle]
#[allow(non_snake_case)]
pub extern fn $fname(size: *mut usize, align: *mut usize) {
unsafe {
*size = mem::size_of::<$T>();
*align = mem::align_of::<$T>();
}
}
}
}
size_align_check!(nsStringRepr, Rust_Test_ReprSizeAlign_nsString);
size_align_check!(nsCStringRepr, Rust_Test_ReprSizeAlign_nsCString);
size_align_check!(nsFixedStringRepr, Rust_Test_ReprSizeAlign_nsFixedString);
size_align_check!(nsFixedCStringRepr, Rust_Test_ReprSizeAlign_nsFixedCString);
/// Generates a $[no_mangle] extern "C" function which returns the size,
/// alignment and offset in the parent struct of a given member, with the
/// given name.
///
/// This method can trigger Undefined Behavior if the accessing the member
/// $member on a given type would use that type's `Deref` implementation.
macro_rules! member_check {
($T:ty, $member:ident, $method:ident) => {
#[no_mangle]
#[allow(non_snake_case)]
pub extern fn $method(size: *mut usize,
align: *mut usize,
offset: *mut usize) {
unsafe {
// Create a temporary value of type T to get offsets, sizes
// and aligns off of
let tmp: $T = mem::zeroed();
*size = mem::size_of_val(&tmp.$member);
*align = mem::align_of_val(&tmp.$member);
*offset =
(&tmp.$member as *const _ as usize) -
(&tmp as *const _ as usize);
mem::forget(tmp);
}
}
}
}
member_check!(nsStringRepr, data, Rust_Test_Member_nsString_mData);
member_check!(nsStringRepr, length, Rust_Test_Member_nsString_mLength);
member_check!(nsStringRepr, flags, Rust_Test_Member_nsString_mFlags);
member_check!(nsCStringRepr, data, Rust_Test_Member_nsCString_mData);
member_check!(nsCStringRepr, length, Rust_Test_Member_nsCString_mLength);
member_check!(nsCStringRepr, flags, Rust_Test_Member_nsCString_mFlags);
member_check!(nsFixedStringRepr, capacity, Rust_Test_Member_nsFixedString_mFixedCapacity);
member_check!(nsFixedStringRepr, buffer, Rust_Test_Member_nsFixedString_mFixedBuf);
member_check!(nsFixedCStringRepr, capacity, Rust_Test_Member_nsFixedCString_mFixedCapacity);
member_check!(nsFixedCStringRepr, buffer, Rust_Test_Member_nsFixedCString_mFixedBuf);
#[no_mangle]
#[allow(non_snake_case)]
pub extern fn Rust_Test_NsStringFlags(f_none: *mut u32,
f_terminated: *mut u32,
f_voided: *mut u32,
f_shared: *mut u32,
f_owned: *mut u32,
f_fixed: *mut u32,
f_literal: *mut u32,
f_class_fixed: *mut u32) {
unsafe {
*f_none = F_NONE;
*f_terminated = F_TERMINATED;
*f_voided = F_VOIDED;
*f_shared = F_SHARED;
*f_owned = F_OWNED;
*f_fixed = F_FIXED;
*f_literal = F_LITERAL;
*f_class_fixed = F_CLASS_FIXED;
}
}
}