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Rollup merge of #111647 - klensy:cstr, r=oli-obk 

use c literals in compiler and library

Use c literals #108801 in compiler and library

currently blocked on:
* <strike>rustfmt: don't know how to format c literals</strike> nope, nightly one works.
* <strike>bootstrap</strike>

r? `@ghost`
`@rustbot` blocked
This commit is contained in:
Matthias Krüger 2023-06-02 18:12:45 +02:00 committed by GitHub
parent 0939ec13d8 2f459f7f14
commit a3b639ce43
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
23 changed files with 73 additions and 97 deletions
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11
Cargo.lock
View File

@ -871,16 +871,6 @@ dependencies = [
"typenum",
]
[[package]]
name = "cstr"
version = "0.2.8"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c11a39d776a3b35896711da8a04dc1835169dcd36f710878187637314e47941b"
dependencies = [
"proc-macro2",
"quote",
]
[[package]]
name = "ctrlc"
version = "3.3.1"
@ -3179,7 +3169,6 @@ name = "rustc_codegen_llvm"
version = "0.0.0"
dependencies = [
"bitflags",
"cstr",
"libc",
"measureme",
"object 0.31.1",

1
compiler/rustc_codegen_llvm/Cargo.toml
View File

@ -8,7 +8,6 @@ test = false
[dependencies]
bitflags = "1.0"
cstr = "0.2"
libc = "0.2"
measureme = "10.0.0"
object = { version = "0.31.1", default-features = false, features = [

4
compiler/rustc_codegen_llvm/src/allocator.rs
View File

@ -77,7 +77,7 @@ pub(crate) unsafe fn codegen(
llvm::LLVMRustGetOrInsertFunction(llmod, callee.as_ptr().cast(), callee.len(), ty);
llvm::LLVMRustSetVisibility(callee, llvm::Visibility::Hidden);
let llbb = llvm::LLVMAppendBasicBlockInContext(llcx, llfn, "entry\0".as_ptr().cast());
let llbb = llvm::LLVMAppendBasicBlockInContext(llcx, llfn, c"entry".as_ptr().cast());
let llbuilder = llvm::LLVMCreateBuilderInContext(llcx);
llvm::LLVMPositionBuilderAtEnd(llbuilder, llbb);
@ -129,7 +129,7 @@ pub(crate) unsafe fn codegen(
attributes::apply_to_llfn(callee, llvm::AttributePlace::Function, &[no_return]);
llvm::LLVMRustSetVisibility(callee, llvm::Visibility::Hidden);
let llbb = llvm::LLVMAppendBasicBlockInContext(llcx, llfn, "entry\0".as_ptr().cast());
let llbb = llvm::LLVMAppendBasicBlockInContext(llcx, llfn, c"entry".as_ptr().cast());
let llbuilder = llvm::LLVMCreateBuilderInContext(llcx);
llvm::LLVMPositionBuilderAtEnd(llbuilder, llbb);

2
compiler/rustc_codegen_llvm/src/back/lto.rs
View File

@ -595,7 +595,7 @@ pub(crate) fn run_pass_manager(
llvm::LLVMRustAddModuleFlag(
module.module_llvm.llmod(),
llvm::LLVMModFlagBehavior::Error,
"LTOPostLink\0".as_ptr().cast(),
c"LTOPostLink".as_ptr().cast(),
1,
);
}

8
compiler/rustc_codegen_llvm/src/back/write.rs
View File

@ -891,11 +891,11 @@ unsafe fn embed_bitcode(
let llglobal = llvm::LLVMAddGlobal(
llmod,
common::val_ty(llconst),
"rustc.embedded.module\0".as_ptr().cast(),
c"rustc.embedded.module".as_ptr().cast(),
);
llvm::LLVMSetInitializer(llglobal, llconst);
let section = if is_apple { "__LLVM,__bitcode\0" } else { ".llvmbc\0" };
let section = if is_apple { c"__LLVM,__bitcode" } else { c".llvmbc" };
llvm::LLVMSetSection(llglobal, section.as_ptr().cast());
llvm::LLVMRustSetLinkage(llglobal, llvm::Linkage::PrivateLinkage);
llvm::LLVMSetGlobalConstant(llglobal, llvm::True);
@ -904,10 +904,10 @@ unsafe fn embed_bitcode(
let llglobal = llvm::LLVMAddGlobal(
llmod,
common::val_ty(llconst),
"rustc.embedded.cmdline\0".as_ptr().cast(),
c"rustc.embedded.cmdline".as_ptr().cast(),
);
llvm::LLVMSetInitializer(llglobal, llconst);
let section = if is_apple { "__LLVM,__cmdline\0" } else { ".llvmcmd\0" };
let section = if is_apple { c"__LLVM,__cmdline" } else { c".llvmcmd" };
llvm::LLVMSetSection(llglobal, section.as_ptr().cast());
llvm::LLVMRustSetLinkage(llglobal, llvm::Linkage::PrivateLinkage);
} else {

6
compiler/rustc_codegen_llvm/src/base.rs
View File

@ -19,8 +19,6 @@ use crate::context::CodegenCx;
use crate::llvm;
use crate::value::Value;
use cstr::cstr;
use rustc_codegen_ssa::base::maybe_create_entry_wrapper;
use rustc_codegen_ssa::mono_item::MonoItemExt;
use rustc_codegen_ssa::traits::*;
@ -110,11 +108,11 @@ pub fn compile_codegen_unit(tcx: TyCtxt<'_>, cgu_name: Symbol) -> (ModuleCodegen
// Create the llvm.used and llvm.compiler.used variables.
if !cx.used_statics.borrow().is_empty() {
cx.create_used_variable_impl(cstr!("llvm.used"), &*cx.used_statics.borrow());
cx.create_used_variable_impl(c"llvm.used", &*cx.used_statics.borrow());
}
if !cx.compiler_used_statics.borrow().is_empty() {
cx.create_used_variable_impl(
cstr!("llvm.compiler.used"),
c"llvm.compiler.used",
&*cx.compiler_used_statics.borrow(),
);
}

16
compiler/rustc_codegen_llvm/src/builder.rs
View File

@ -6,7 +6,6 @@ use crate::llvm::{self, AtomicOrdering, AtomicRmwBinOp, BasicBlock, False, True}
use crate::type_::Type;
use crate::type_of::LayoutLlvmExt;
use crate::value::Value;
use cstr::cstr;
use libc::{c_char, c_uint};
use rustc_codegen_ssa::common::{IntPredicate, RealPredicate, SynchronizationScope, TypeKind};
use rustc_codegen_ssa::mir::operand::{OperandRef, OperandValue};
@ -25,7 +24,6 @@ use rustc_symbol_mangling::typeid::{kcfi_typeid_for_fnabi, typeid_for_fnabi, Typ
use rustc_target::abi::{self, call::FnAbi, Align, Size, WrappingRange};
use rustc_target::spec::{HasTargetSpec, SanitizerSet, Target};
use std::borrow::Cow;
use std::ffi::CStr;
use std::iter;
use std::ops::Deref;
use std::ptr;
@ -45,13 +43,10 @@ impl Drop for Builder<'_, '_, '_> {
}
}
// FIXME(eddyb) use a checked constructor when they become `const fn`.
const EMPTY_C_STR: &CStr = unsafe { CStr::from_bytes_with_nul_unchecked(b"\0") };
/// Empty string, to be used where LLVM expects an instruction name, indicating
/// that the instruction is to be left unnamed (i.e. numbered, in textual IR).
// FIXME(eddyb) pass `&CStr` directly to FFI once it's a thin pointer.
const UNNAMED: *const c_char = EMPTY_C_STR.as_ptr();
const UNNAMED: *const c_char = c"".as_ptr();
impl<'ll, 'tcx> BackendTypes for Builder<'_, 'll, 'tcx> {
type Value = <CodegenCx<'ll, 'tcx> as BackendTypes>::Value;
@ -1010,14 +1005,13 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
}
fn cleanup_pad(&mut self, parent: Option<&'ll Value>, args: &[&'ll Value]) -> Funclet<'ll> {
let name = cstr!("cleanuppad");
let ret = unsafe {
llvm::LLVMBuildCleanupPad(
self.llbuilder,
parent,
args.as_ptr(),
args.len() as c_uint,
name.as_ptr(),
c"cleanuppad".as_ptr(),
)
};
Funclet::new(ret.expect("LLVM does not have support for cleanuppad"))
@ -1031,14 +1025,13 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
}
fn catch_pad(&mut self, parent: &'ll Value, args: &[&'ll Value]) -> Funclet<'ll> {
let name = cstr!("catchpad");
let ret = unsafe {
llvm::LLVMBuildCatchPad(
self.llbuilder,
parent,
args.as_ptr(),
args.len() as c_uint,
name.as_ptr(),
c"catchpad".as_ptr(),
)
};
Funclet::new(ret.expect("LLVM does not have support for catchpad"))
@ -1050,14 +1043,13 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
unwind: Option<&'ll BasicBlock>,
handlers: &[&'ll BasicBlock],
) -> &'ll Value {
let name = cstr!("catchswitch");
let ret = unsafe {
llvm::LLVMBuildCatchSwitch(
self.llbuilder,
parent,
unwind,
handlers.len() as c_uint,
name.as_ptr(),
c"catchswitch".as_ptr(),
)
};
let ret = ret.expect("LLVM does not have support for catchswitch");

7
compiler/rustc_codegen_llvm/src/consts.rs
View File

@ -8,7 +8,6 @@ use crate::llvm::{self, True};
use crate::type_::Type;
use crate::type_of::LayoutLlvmExt;
use crate::value::Value;
use cstr::cstr;
use rustc_codegen_ssa::traits::*;
use rustc_hir::def_id::DefId;
use rustc_middle::middle::codegen_fn_attrs::{CodegenFnAttrFlags, CodegenFnAttrs};
@ -482,9 +481,9 @@ impl<'ll> StaticMethods for CodegenCx<'ll, '_> {
.all(|&byte| byte == 0);
let sect_name = if all_bytes_are_zero {
cstr!("__DATA,__thread_bss")
c"__DATA,__thread_bss"
} else {
cstr!("__DATA,__thread_data")
c"__DATA,__thread_data"
};
llvm::LLVMSetSection(g, sect_name.as_ptr());
}
@ -513,7 +512,7 @@ impl<'ll> StaticMethods for CodegenCx<'ll, '_> {
let val = llvm::LLVMMetadataAsValue(self.llcx, meta);
llvm::LLVMAddNamedMetadataOperand(
self.llmod,
"wasm.custom_sections\0".as_ptr().cast(),
c"wasm.custom_sections".as_ptr().cast(),
val,
);
}

44
compiler/rustc_codegen_llvm/src/context.rs
View File

@ -8,7 +8,6 @@ use crate::llvm_util;
use crate::type_::Type;
use crate::value::Value;
use cstr::cstr;
use rustc_codegen_ssa::base::wants_msvc_seh;
use rustc_codegen_ssa::traits::*;
use rustc_data_structures::base_n;
@ -224,36 +223,42 @@ pub unsafe fn create_module<'ll>(
// If skipping the PLT is enabled, we need to add some module metadata
// to ensure intrinsic calls don't use it.
if !sess.needs_plt() {
let avoid_plt = "RtLibUseGOT\0".as_ptr().cast();
llvm::LLVMRustAddModuleFlag(llmod, llvm::LLVMModFlagBehavior::Warning, avoid_plt, 1);
llvm::LLVMRustAddModuleFlag(
llmod,
llvm::LLVMModFlagBehavior::Warning,
c"RtLibUseGOT".as_ptr().cast(),
1,
);
}
// Enable canonical jump tables if CFI is enabled. (See https://reviews.llvm.org/D65629.)
if sess.is_sanitizer_cfi_canonical_jump_tables_enabled() && sess.is_sanitizer_cfi_enabled() {
let canonical_jump_tables = "CFI Canonical Jump Tables\0".as_ptr().cast();
llvm::LLVMRustAddModuleFlag(
llmod,
llvm::LLVMModFlagBehavior::Override,
canonical_jump_tables,
c"CFI Canonical Jump Tables".as_ptr().cast(),
1,
);
}
// Enable LTO unit splitting if specified or if CFI is enabled. (See https://reviews.llvm.org/D53891.)
if sess.is_split_lto_unit_enabled() || sess.is_sanitizer_cfi_enabled() {
let enable_split_lto_unit = "EnableSplitLTOUnit\0".as_ptr().cast();
llvm::LLVMRustAddModuleFlag(
llmod,
llvm::LLVMModFlagBehavior::Override,
enable_split_lto_unit,
c"EnableSplitLTOUnit".as_ptr().cast(),
1,
);
}
// Add "kcfi" module flag if KCFI is enabled. (See https://reviews.llvm.org/D119296.)
if sess.is_sanitizer_kcfi_enabled() {
let kcfi = "kcfi\0".as_ptr().cast();
llvm::LLVMRustAddModuleFlag(llmod, llvm::LLVMModFlagBehavior::Override, kcfi, 1);
llvm::LLVMRustAddModuleFlag(
llmod,
llvm::LLVMModFlagBehavior::Override,
c"kcfi".as_ptr().cast(),
1,
);
}
// Control Flow Guard is currently only supported by the MSVC linker on Windows.
@ -265,7 +270,7 @@ pub unsafe fn create_module<'ll>(
llvm::LLVMRustAddModuleFlag(
llmod,
llvm::LLVMModFlagBehavior::Warning,
"cfguard\0".as_ptr() as *const _,
c"cfguard".as_ptr() as *const _,
1,
)
}
@ -274,7 +279,7 @@ pub unsafe fn create_module<'ll>(
llvm::LLVMRustAddModuleFlag(
llmod,
llvm::LLVMModFlagBehavior::Warning,
"cfguard\0".as_ptr() as *const _,
c"cfguard".as_ptr() as *const _,
2,
)
}
@ -292,26 +297,26 @@ pub unsafe fn create_module<'ll>(
llvm::LLVMRustAddModuleFlag(
llmod,
behavior,
"branch-target-enforcement\0".as_ptr().cast(),
c"branch-target-enforcement".as_ptr().cast(),
bti.into(),
);
llvm::LLVMRustAddModuleFlag(
llmod,
behavior,
"sign-return-address\0".as_ptr().cast(),
c"sign-return-address".as_ptr().cast(),
pac_ret.is_some().into(),
);
let pac_opts = pac_ret.unwrap_or(PacRet { leaf: false, key: PAuthKey::A });
llvm::LLVMRustAddModuleFlag(
llmod,
behavior,
"sign-return-address-all\0".as_ptr().cast(),
c"sign-return-address-all".as_ptr().cast(),
pac_opts.leaf.into(),
);
llvm::LLVMRustAddModuleFlag(
llmod,
behavior,
"sign-return-address-with-bkey\0".as_ptr().cast(),
c"sign-return-address-with-bkey".as_ptr().cast(),
u32::from(pac_opts.key == PAuthKey::B),
);
} else {
@ -327,7 +332,7 @@ pub unsafe fn create_module<'ll>(
llvm::LLVMRustAddModuleFlag(
llmod,
llvm::LLVMModFlagBehavior::Override,
"cf-protection-branch\0".as_ptr().cast(),
c"cf-protection-branch".as_ptr().cast(),
1,
)
}
@ -335,7 +340,7 @@ pub unsafe fn create_module<'ll>(
llvm::LLVMRustAddModuleFlag(
llmod,
llvm::LLVMModFlagBehavior::Override,
"cf-protection-return\0".as_ptr().cast(),
c"cf-protection-return".as_ptr().cast(),
1,
)
}
@ -344,7 +349,7 @@ pub unsafe fn create_module<'ll>(
llvm::LLVMRustAddModuleFlag(
llmod,
llvm::LLVMModFlagBehavior::Error,
"Virtual Function Elim\0".as_ptr().cast(),
c"Virtual Function Elim".as_ptr().cast(),
1,
);
}
@ -476,14 +481,13 @@ impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
}
pub(crate) fn create_used_variable_impl(&self, name: &'static CStr, values: &[&'ll Value]) {
let section = cstr!("llvm.metadata");
let array = self.const_array(self.type_ptr_to(self.type_i8()), values);
unsafe {
let g = llvm::LLVMAddGlobal(self.llmod, self.val_ty(array), name.as_ptr());
llvm::LLVMSetInitializer(g, array);
llvm::LLVMRustSetLinkage(g, llvm::Linkage::AppendingLinkage);
llvm::LLVMSetSection(g, section.as_ptr());
llvm::LLVMSetSection(g, c"llvm.metadata".as_ptr());
}
}
}

3
compiler/rustc_codegen_llvm/src/debuginfo/gdb.rs
View File

@ -38,7 +38,6 @@ pub fn get_or_insert_gdb_debug_scripts_section_global<'ll>(cx: &CodegenCx<'ll, '
unsafe { llvm::LLVMGetNamedGlobal(cx.llmod, c_section_var_name.as_ptr().cast()) };
section_var.unwrap_or_else(|| {
let section_name = b".debug_gdb_scripts\0";
let mut section_contents = Vec::new();
// Add the pretty printers for the standard library first.
@ -71,7 +70,7 @@ pub fn get_or_insert_gdb_debug_scripts_section_global<'ll>(cx: &CodegenCx<'ll, '
let section_var = cx
.define_global(section_var_name, llvm_type)
.unwrap_or_else(|| bug!("symbol `{}` is already defined", section_var_name));
llvm::LLVMSetSection(section_var, section_name.as_ptr().cast());
llvm::LLVMSetSection(section_var, c".debug_gdb_scripts".as_ptr().cast());
llvm::LLVMSetInitializer(section_var, cx.const_bytes(section_contents));
llvm::LLVMSetGlobalConstant(section_var, llvm::True);
llvm::LLVMSetUnnamedAddress(section_var, llvm::UnnamedAddr::Global);

9
compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
View File

@ -20,7 +20,6 @@ use crate::llvm::debuginfo::{
};
use crate::value::Value;
use cstr::cstr;
use rustc_codegen_ssa::debuginfo::type_names::cpp_like_debuginfo;
use rustc_codegen_ssa::debuginfo::type_names::VTableNameKind;
use rustc_codegen_ssa::traits::*;
@ -812,7 +811,6 @@ pub fn build_compile_unit_di_node<'ll, 'tcx>(
let name_in_debuginfo = name_in_debuginfo.to_string_lossy();
let work_dir = tcx.sess.opts.working_dir.to_string_lossy(FileNameDisplayPreference::Remapped);
let flags = "\0";
let output_filenames = tcx.output_filenames(());
let split_name = if tcx.sess.target_can_use_split_dwarf() {
output_filenames
@ -849,7 +847,7 @@ pub fn build_compile_unit_di_node<'ll, 'tcx>(
producer.as_ptr().cast(),
producer.len(),
tcx.sess.opts.optimize != config::OptLevel::No,
flags.as_ptr().cast(),
c"".as_ptr().cast(),
0,
// NB: this doesn't actually have any perceptible effect, it seems. LLVM will instead
// put the path supplied to `MCSplitDwarfFile` into the debug info of the final
@ -878,8 +876,7 @@ pub fn build_compile_unit_di_node<'ll, 'tcx>(
);
let val = llvm::LLVMMetadataAsValue(debug_context.llcontext, gcov_metadata);
let llvm_gcov_ident = cstr!("llvm.gcov");
llvm::LLVMAddNamedMetadataOperand(debug_context.llmod, llvm_gcov_ident.as_ptr(), val);
llvm::LLVMAddNamedMetadataOperand(debug_context.llmod, c"llvm.gcov".as_ptr(), val);
}
// Insert `llvm.ident` metadata on the wasm targets since that will
@ -892,7 +889,7 @@ pub fn build_compile_unit_di_node<'ll, 'tcx>(
);
llvm::LLVMAddNamedMetadataOperand(
debug_context.llmod,
cstr!("llvm.ident").as_ptr(),
c"llvm.ident".as_ptr(),
llvm::LLVMMDNodeInContext(debug_context.llcontext, &name_metadata, 1),
);
}

7
compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
View File

@ -113,7 +113,7 @@ impl<'ll, 'tcx> CodegenUnitDebugContext<'ll, 'tcx> {
llvm::LLVMRustAddModuleFlag(
self.llmod,
llvm::LLVMModFlagBehavior::Warning,
"Dwarf Version\0".as_ptr().cast(),
c"Dwarf Version".as_ptr().cast(),
dwarf_version,
);
} else {
@ -121,17 +121,16 @@ impl<'ll, 'tcx> CodegenUnitDebugContext<'ll, 'tcx> {
llvm::LLVMRustAddModuleFlag(
self.llmod,
llvm::LLVMModFlagBehavior::Warning,
"CodeView\0".as_ptr().cast(),
c"CodeView".as_ptr().cast(),
1,
)
}
// Prevent bitcode readers from deleting the debug info.
let ptr = "Debug Info Version\0".as_ptr();
llvm::LLVMRustAddModuleFlag(
self.llmod,
llvm::LLVMModFlagBehavior::Warning,
ptr.cast(),
c"Debug Info Version".as_ptr().cast(),
llvm::LLVMRustDebugMetadataVersion(),
);
}

1
compiler/rustc_codegen_llvm/src/lib.rs
View File

@ -11,6 +11,7 @@
#![feature(let_chains)]
#![feature(never_type)]
#![feature(impl_trait_in_assoc_type)]
#![feature(c_str_literals)]
#![recursion_limit = "256"]
#![allow(rustc::potential_query_instability)]
#![deny(rustc::untranslatable_diagnostic)]

1
library/std/src/lib.rs
View File

@ -240,6 +240,7 @@
#![feature(allocator_internals)]
#![feature(allow_internal_unsafe)]
#![feature(allow_internal_unstable)]
#![feature(c_str_literals)]
#![feature(c_unwind)]
#![feature(cfg_target_thread_local)]
#![feature(concat_idents)]

14
library/std/src/sys/unix/args.rs
View File

@ -242,13 +242,15 @@ mod imp {
let mut res = Vec::new();
unsafe {
let process_info_sel = sel_registerName("processInfo\0".as_ptr());
let arguments_sel = sel_registerName("arguments\0".as_ptr());
let utf8_sel = sel_registerName("UTF8String\0".as_ptr());
let count_sel = sel_registerName("count\0".as_ptr());
let object_at_sel = sel_registerName("objectAtIndex:\0".as_ptr());
let process_info_sel =
sel_registerName(c"processInfo".as_ptr() as *const libc::c_uchar);
let arguments_sel = sel_registerName(c"arguments".as_ptr() as *const libc::c_uchar);
let utf8_sel = sel_registerName(c"UTF8String".as_ptr() as *const libc::c_uchar);
let count_sel = sel_registerName(c"count".as_ptr() as *const libc::c_uchar);
let object_at_sel =
sel_registerName(c"objectAtIndex:".as_ptr() as *const libc::c_uchar);
let klass = objc_getClass("NSProcessInfo\0".as_ptr());
let klass = objc_getClass(c"NSProcessInfo".as_ptr() as *const libc::c_uchar);
let info = objc_msgSend(klass, process_info_sel);
let args = objc_msgSend(info, arguments_sel);

2
library/std/src/sys/unix/fs.rs
View File

@ -1063,7 +1063,7 @@ impl File {
cfg_has_statx! {
if let Some(ret) = unsafe { try_statx(
fd,
b"\0" as *const _ as *const c_char,
c"".as_ptr() as *const c_char,
libc::AT_EMPTY_PATH | libc::AT_STATX_SYNC_AS_STAT,
libc::STATX_ALL,
) } {

7
library/std/src/sys/unix/mod.rs
View File

@ -1,6 +1,5 @@
#![allow(missing_docs, nonstandard_style)]
use crate::ffi::CStr;
use crate::io::ErrorKind;
pub use self::rand::hashmap_random_keys;
@ -75,7 +74,7 @@ pub unsafe fn init(argc: isize, argv: *const *const u8, sigpipe: u8) {
// thread-id for the main thread and so renaming the main thread will rename the
// process and we only want to enable this on platforms we've tested.
if cfg!(target_os = "macos") {
thread::Thread::set_name(&CStr::from_bytes_with_nul_unchecked(b"main\0"));
thread::Thread::set_name(&c"main");
}
unsafe fn sanitize_standard_fds() {
@ -121,7 +120,7 @@ pub unsafe fn init(argc: isize, argv: *const *const u8, sigpipe: u8) {
if pfd.revents & libc::POLLNVAL == 0 {
continue;
}
if open64("/dev/null\0".as_ptr().cast(), libc::O_RDWR, 0) == -1 {
if open64(c"/dev/null".as_ptr().cast(), libc::O_RDWR, 0) == -1 {
// If the stream is closed but we failed to reopen it, abort the
// process. Otherwise we wouldn't preserve the safety of
// operations on the corresponding Rust object Stdin, Stdout, or
@ -151,7 +150,7 @@ pub unsafe fn init(argc: isize, argv: *const *const u8, sigpipe: u8) {
use libc::open64;
for fd in 0..3 {
if libc::fcntl(fd, libc::F_GETFD) == -1 && errno() == libc::EBADF {
if open64("/dev/null\0".as_ptr().cast(), libc::O_RDWR, 0) == -1 {
if open64(c"/dev/null".as_ptr().cast(), libc::O_RDWR, 0) == -1 {
// If the stream is closed but we failed to reopen it, abort the
// process. Otherwise we wouldn't preserve the safety of
// operations on the corresponding Rust object Stdin, Stdout, or

9
library/std/src/sys/unix/process/process_common.rs
View File

@ -24,11 +24,11 @@ cfg_if::cfg_if! {
if #[cfg(target_os = "fuchsia")] {
// fuchsia doesn't have /dev/null
} else if #[cfg(target_os = "redox")] {
const DEV_NULL: &str = "null:\0";
const DEV_NULL: &CStr = c"null:";
} else if #[cfg(target_os = "vxworks")] {
const DEV_NULL: &str = "/null\0";
const DEV_NULL: &CStr = c"/null";
} else {
const DEV_NULL: &str = "/dev/null\0";
const DEV_NULL: &CStr = c"/dev/null";
}
}
@ -474,8 +474,7 @@ impl Stdio {
let mut opts = OpenOptions::new();
opts.read(readable);
opts.write(!readable);
let path = unsafe { CStr::from_ptr(DEV_NULL.as_ptr() as *const _) };
let fd = File::open_c(&path, &opts)?;
let fd = File::open_c(DEV_NULL, &opts)?;
Ok((ChildStdio::Owned(fd.into_inner()), None))
}

3
library/std/src/sys/unix/thread.rs
View File

@ -163,10 +163,9 @@ impl Thread {
#[cfg(target_os = "netbsd")]
pub fn set_name(name: &CStr) {
unsafe {
let cname = CStr::from_bytes_with_nul_unchecked(b"%s\0".as_slice());
let res = libc::pthread_setname_np(
libc::pthread_self(),
cname.as_ptr(),
c"%s".as_ptr(),
name.as_ptr() as *mut libc::c_void,
);
debug_assert_eq!(res, 0);

4
library/std/src/sys/windows/c.rs
View File

@ -317,7 +317,7 @@ pub unsafe fn NtWriteFile(
// Functions that aren't available on every version of Windows that we support,
// but we still use them and just provide some form of a fallback implementation.
compat_fn_with_fallback! {
pub static KERNEL32: &CStr = ansi_str!("kernel32");
pub static KERNEL32: &CStr = c"kernel32";
// >= Win10 1607
// https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-setthreaddescription
@ -350,7 +350,7 @@ compat_fn_optional! {
}
compat_fn_with_fallback! {
pub static NTDLL: &CStr = ansi_str!("ntdll");
pub static NTDLL: &CStr = c"ntdll";
pub fn NtCreateKeyedEvent(
KeyedEventHandle: LPHANDLE,

6
library/std/src/sys/windows/compat.rs
View File

@ -228,9 +228,9 @@ macro_rules! compat_fn_optional {
/// Load all needed functions from "api-ms-win-core-synch-l1-2-0".
pub(super) fn load_synch_functions() {
fn try_load() -> Option<()> {
const MODULE_NAME: &CStr = ansi_str!("api-ms-win-core-synch-l1-2-0");
const WAIT_ON_ADDRESS: &CStr = ansi_str!("WaitOnAddress");
const WAKE_BY_ADDRESS_SINGLE: &CStr = ansi_str!("WakeByAddressSingle");
const MODULE_NAME: &CStr = c"api-ms-win-core-synch-l1-2-0";
const WAIT_ON_ADDRESS: &CStr = c"WaitOnAddress";
const WAKE_BY_ADDRESS_SINGLE: &CStr = c"WakeByAddressSingle";
// Try loading the library and all the required functions.
// If any step fails, then they all fail.

4
library/std/src/sys/windows/mod.rs
View File

@ -1,6 +1,6 @@
#![allow(missing_docs, nonstandard_style)]
use crate::ffi::{CStr, OsStr, OsString};
use crate::ffi::{OsStr, OsString};
use crate::io::ErrorKind;
use crate::mem::MaybeUninit;
use crate::os::windows::ffi::{OsStrExt, OsStringExt};
@ -51,7 +51,7 @@ pub unsafe fn init(_argc: isize, _argv: *const *const u8, _sigpipe: u8) {
// Normally, `thread::spawn` will call `Thread::set_name` but since this thread already
// exists, we have to call it ourselves.
thread::Thread::set_name(&CStr::from_bytes_with_nul_unchecked(b"main\0"));
thread::Thread::set_name(&c"main");
}
// SAFETY: must be called only once during runtime cleanup.

1
src/tools/tidy/src/deps.rs
View File

@ -132,7 +132,6 @@ const PERMITTED_RUSTC_DEPENDENCIES: &[&str] = &[
"crossbeam-epoch",
"crossbeam-utils",
"crypto-common",
"cstr",
"datafrog",
"derive_more",
"digest",