Merge pull request #4094 from tgross35/sync-more-main

Sync more files with `libc-0.2` to reduce the diff

Author: tgross35

src/fixed_width_ints.rs

@@ -59,28 +59,29 @@ cfg_if! {
         /// C __uint128_t (alternate name for [__uint128][])
         pub type __uint128_t = u128;
 
-        macro_rules! static_assert_eq {
-            ($a:expr, $b:expr) => {
-                const _: [(); $a] = [(); $b];
-            };
-        }
-
         // NOTE: if you add more platforms to here, you may need to cfg
         // these consts. They should always match the platform's values
         // for `sizeof(__int128)` and `_Alignof(__int128)`.
         const _SIZE_128: usize = 16;
         const _ALIGN_128: usize = 16;
 
-        // Since Rust doesn't officially guarantee that these types
-        // have compatible ABIs, we const assert that these values have the
-        // known size/align of the target platform's libc. If rustc ever
-        // tries to regress things, it will cause a compilation error.
+        // FIXME(ctest): ctest doesn't handle `_` as an identifier so these tests are temporarily
+        // disabled.
+        // macro_rules! static_assert_eq {
+        //     ($a:expr, $b:expr) => {
+        //         const _: [(); $a] = [(); $b];
+        //     };
+        // }
         //
-        // This isn't a bullet-proof solution because e.g. it doesn't
-        // catch the fact that llvm and gcc disagree on how x64 __int128
-        // is actually *passed* on the stack (clang underaligns it for
-        // the same reason that rustc *never* properly aligns it).
-        // FIXME: temporarily disabled because of a ctest2 bug.
+        // // Since Rust doesn't officially guarantee that these types
+        // // have compatible ABIs, we const assert that these values have the
+        // // known size/align of the target platform's libc. If rustc ever
+        // // tries to regress things, it will cause a compilation error.
+        // //
+        // // This isn't a bullet-proof solution because e.g. it doesn't
+        // // catch the fact that llvm and gcc disagree on how x64 __int128
+        // // is actually *passed* on the stack (clang underaligns it for
+        // // the same reason that rustc *never* properly aligns it).
         // static_assert_eq!(core::mem::size_of::<__int128>(), _SIZE_128);
         // static_assert_eq!(core::mem::align_of::<__int128>(), _ALIGN_128);
 
@@ -93,9 +94,9 @@ cfg_if! {
         // static_assert_eq!(core::mem::size_of::<__uint128_t>(), _SIZE_128);
         // static_assert_eq!(core::mem::align_of::<__uint128_t>(), _ALIGN_128);
     } else if #[cfg(all(target_arch = "aarch64", any(target_os = "macos", target_os = "ios", target_os = "tvos", target_os = "watchos")))] {
-        /// /// C `__int128_t`
+        /// C `__int128_t`
         pub type __int128_t = i128;
-        /// /// C `__uint128_t`
+        /// C `__uint128_t`
         pub type __uint128_t = u128;
     }
 }

src/macros.rs

@@ -167,6 +167,36 @@ macro_rules! e {
     )*);
 }
 
+// This is a pretty horrible hack to allow us to conditionally mark
+// some functions as 'const', without requiring users of this macro
+// to care about the "const-extern-fn" feature.
+//
+// When 'const-extern-fn' is enabled, we emit the captured 'const' keyword
+// in the expanded function.
+//
+// When 'const-extern-fn' is disabled, we always emit a plain 'pub unsafe extern fn'.
+// Note that the expression matched by the macro is exactly the same - this allows
+// users of this macro to work whether or not 'const-extern-fn' is enabled
+//
+// Unfortunately, we need to duplicate most of this macro between the 'cfg_if' blocks.
+// This is because 'const unsafe extern fn' won't even parse on older compilers,
+// so we need to avoid emitting it at all of 'const-extern-fn'.
+//
+// Specifically, moving the 'cfg_if' into the macro body will *not* work.
+// Doing so would cause the '#[cfg(feature = "const-extern-fn")]' to be emitted
+// into user code. The 'cfg' gate will not stop Rust from trying to parse the
+// 'pub const unsafe extern fn', so users would get a compiler error even when
+// the 'const-extern-fn' feature is disabled
+//
+// Note that users of this macro need to place 'const' in a weird position
+// (after the closing ')' for the arguments, but before the return type).
+// This was the only way I could satisfy the following two requirements:
+// 1. Avoid ambiguity errors from 'macro_rules!' (which happen when writing '$foo:ident fn'
+// 2. Allow users of this macro to mix 'pub fn foo' and 'pub const fn bar' within the same
+// 'f!' block
+
+// FIXME(ctest): ctest can't handle `const extern` functions, we should be able to remove this
+// cfg completely.
 cfg_if! {
     if #[cfg(feature = "const-extern-fn")] {
         /// Define an `unsafe` function that is const as long as `const-extern-fn` is enabled.
@@ -243,8 +273,7 @@ cfg_if! {
             )*) => ($(
                 #[inline]
                 $(#[$attr])*
-                pub extern fn $i($($arg: $argty),*
-                ) -> $ret {
+                pub extern fn $i($($arg: $argty),*) -> $ret {
                     $($body);*
                 }
             )*)

src/unix/bsd/apple/b64/aarch64/mod.rs

@@ -6,7 +6,7 @@ s! {
         __private: [::uintptr_t; 18], // FIXME: needs arm64 auth pointers support
     }
 
-     pub struct ucontext_t {
+    pub struct ucontext_t {
         pub uc_onstack: ::c_int,
         pub uc_sigmask: ::sigset_t,
         pub uc_stack: ::stack_t,

src/unix/bsd/apple/mod.rs

@@ -1175,6 +1175,7 @@ s! {
         pub ifs6_pfx_expiry_cnt: ::u_quad_t,
         pub ifs6_defrtr_expiry_cnt: ::u_quad_t,
     }
+
     pub struct icmp6_ifstat {
         pub ifs6_in_msg: ::u_quad_t,
         pub ifs6_in_error: ::u_quad_t,

src/unix/bsd/freebsdlike/freebsd/arm.rs

@@ -51,8 +51,10 @@ cfg_if! {
 }
 
 pub(crate) const _ALIGNBYTES: usize = ::mem::size_of::<::c_int>() - 1;
+
 pub const BIOCSRTIMEOUT: ::c_ulong = 0x8010426d;
 pub const BIOCGRTIMEOUT: ::c_ulong = 0x4010426e;
+
 pub const MAP_32BIT: ::c_int = 0x00080000;
 pub const MINSIGSTKSZ: ::size_t = 4096; // 1024 * 4
 pub const TIOCTIMESTAMP: ::c_ulong = 0x40107459;

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -1723,13 +1723,12 @@ cfg_if! {
                     && self.cr_uid == other.cr_uid
                     && self.cr_ngroups == other.cr_ngroups
                     && self.cr_groups == other.cr_groups
-                    && self.cr_pid__c_anonymous_union
-                        == other.cr_pid__c_anonymous_union
+                    && self.cr_pid__c_anonymous_union == other.cr_pid__c_anonymous_union
             }
         }
         impl Eq for xucred {}
         impl ::fmt::Debug for xucred {
-            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
+            fn fmt(&self, f: &mut ::fmt::Formatter<'_>) -> ::fmt::Result {
                 f.debug_struct("xucred")
                     .field("cr_version", &self.cr_version)
                     .field("cr_uid", &self.cr_uid)
@@ -4904,16 +4903,16 @@ pub const TFD_CLOEXEC: ::c_int = O_CLOEXEC;
 pub const TFD_TIMER_ABSTIME: ::c_int = 0x01;
 pub const TFD_TIMER_CANCEL_ON_SET: ::c_int = 0x02;
 
+// sys/unistd.h
+
+pub const CLOSE_RANGE_CLOEXEC: ::c_uint = 1 << 2;
+
 pub const KCMP_FILE: ::c_int = 100;
 pub const KCMP_FILEOBJ: ::c_int = 101;
 pub const KCMP_FILES: ::c_int = 102;
 pub const KCMP_SIGHAND: ::c_int = 103;
 pub const KCMP_VM: ::c_int = 104;
 
-// sys/unistd.h
-
-pub const CLOSE_RANGE_CLOEXEC: ::c_uint = 1 << 2;
-
 pub const fn MAP_ALIGNED(a: ::c_int) -> ::c_int {
     a << 24
 }
@@ -5632,19 +5631,19 @@ extern "C" {
     pub fn closefrom(lowfd: ::c_int);
     pub fn close_range(lowfd: ::c_uint, highfd: ::c_uint, flags: ::c_int) -> ::c_int;
 
+    pub fn execvpe(
+        file: *const ::c_char,
+        argv: *const *const ::c_char,
+        envp: *const *const ::c_char,
+    ) -> ::c_int;
+
     pub fn kcmp(
         pid1: ::pid_t,
         pid2: ::pid_t,
         type_: ::c_int,
         idx1: ::c_ulong,
         idx2: ::c_ulong,
     ) -> ::c_int;
-
-    pub fn execvpe(
-        file: *const ::c_char,
-        argv: *const *const ::c_char,
-        envp: *const *const ::c_char,
-    ) -> ::c_int;
 }
 
 #[link(name = "memstat")]

src/unix/bsd/freebsdlike/freebsd/powerpc.rs

@@ -70,6 +70,7 @@ cfg_if! {
 }
 
 pub(crate) const _ALIGNBYTES: usize = ::mem::size_of::<::c_int>() - 1;
+
 pub const BIOCSRTIMEOUT: ::c_ulong = 0x8010426d;
 pub const BIOCGRTIMEOUT: ::c_ulong = 0x4010426e;
 pub const MAP_32BIT: ::c_int = 0x00080000;

src/unix/bsd/freebsdlike/freebsd/powerpc64.rs

@@ -70,8 +70,10 @@ cfg_if! {
 }
 
 pub(crate) const _ALIGNBYTES: usize = ::mem::size_of::<::c_long>() - 1;
+
 pub const BIOCSRTIMEOUT: ::c_ulong = 0x8010426d;
 pub const BIOCGRTIMEOUT: ::c_ulong = 0x4010426e;
+
 pub const MAP_32BIT: ::c_int = 0x00080000;
 pub const MINSIGSTKSZ: ::size_t = 2048; // 512 * 4
 pub const TIOCTIMESTAMP: ::c_ulong = 0x40107459;

src/unix/bsd/freebsdlike/freebsd/riscv64.rs

@@ -36,8 +36,6 @@ s_no_extra_traits! {
     }
 }
 
-pub(crate) const _ALIGNBYTES: usize = ::mem::size_of::<::c_longlong>() - 1;
-
 cfg_if! {
     if #[cfg(feature = "extra_traits")] {
         impl PartialEq for gpregs {
@@ -142,6 +140,8 @@ cfg_if! {
     }
 }
 
+pub(crate) const _ALIGNBYTES: usize = ::mem::size_of::<::c_longlong>() - 1;
+
 pub const BIOCSRTIMEOUT: ::c_ulong = 0x8010426d;
 pub const BIOCGRTIMEOUT: ::c_ulong = 0x4010426e;
 pub const MAP_32BIT: ::c_int = 0x00080000;

src/unix/bsd/netbsdlike/openbsd/mod.rs

@@ -1045,11 +1045,10 @@ cfg_if! {
             }
         }
 
-        impl Eq for statfs { }
+        impl Eq for statfs {}
 
         impl ::fmt::Debug for statfs {
-            fn fmt(&self, f: &mut ::fmt::Formatter)
-                    -> ::fmt::Result {
+            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                 f.debug_struct("statfs")
                     .field("f_flags", &self.f_flags)
                     .field("f_bsize", &self.f_bsize)