openharmony/third_party_rust_memoffset
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old rust compat

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Ralf Jung
2019-07-14 01:19:05 +02:00
parent 0360b4c8ac
commit fc033fda9c
2 changed files with 14 additions and 14 deletions
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src/offset_of.rs
+2 -2
View File
@@ -76,10 +76,10 @@ macro_rules! field_check {
#[macro_export]
macro_rules! offset_of {
($parent:tt, $field:tt) => {{
$crate::field_check!($parent, $field);
field_check!($parent, $field);
// Get a base pointer.
$crate::let_base_ptr!(base_ptr, $parent);
let_base_ptr!(base_ptr, $parent);
// Get the field address. This is UB because we are creating a reference to
// the uninitialized field.
#[allow(unused_unsafe)] // for when the macro is used in an unsafe block
src/span_of.rs
+12 -12
View File
@@ -91,30 +91,30 @@ macro_rules! span_of {
$root as usize + $crate::mem::size_of_val(&(*$root)))
}};
(@helper $root:ident, $parent:tt, [] ..= $field:tt) => {{
$crate::field_check!($parent, $field);
field_check!($parent, $field);
($root as usize,
&(*$root).$field as *const _ as usize + $crate::mem::size_of_val(&(*$root).$field))
}};
(@helper $root:ident, $parent:tt, [] .. $field:tt) => {{
$crate::field_check!($parent, $field);
field_check!($parent, $field);
($root as usize, &(*$root).$field as *const _ as usize)
}};
// Explicit begin and end for range.
(@helper $root:ident, $parent:tt, # $begin:tt [] ..= $end:tt) => {{
$crate::field_check!($parent, $begin);
$crate::field_check!($parent, $end);
field_check!($parent, $begin);
field_check!($parent, $end);
(&(*$root).$begin as *const _ as usize,
&(*$root).$end as *const _ as usize + $crate::mem::size_of_val(&(*$root).$end))
}};
(@helper $root:ident, $parent:tt, # $begin:tt [] .. $end:tt) => {{
$crate::field_check!($parent, $begin);
$crate::field_check!($parent, $end);
field_check!($parent, $begin);
field_check!($parent, $end);
(&(*$root).$begin as *const _ as usize,
&(*$root).$end as *const _ as usize)
}};
// No explicit end for range.
(@helper $root:ident, $parent:tt, # $begin:tt [] ..) => {{
$crate::field_check!($parent, $begin);
field_check!($parent, $begin);
(&(*$root).$begin as *const _ as usize,
$root as usize + $crate::mem::size_of_val(&*$root))
}};
@@ -124,25 +124,25 @@ macro_rules! span_of {
}};
// Just one field.
(@helper $root:ident, $parent:tt, # $begin:tt []) => {{
$crate::field_check!($parent, $begin);
field_check!($parent, $begin);
(&(*$root).$begin as *const _ as usize,
&(*$root).$begin as *const _ as usize + $crate::mem::size_of_val(&(*$root).$begin))
}};
// Parsing.
(@helper $root:ident, $parent:tt, $(# $begin:tt)+ [] $tt:tt $($rest:tt)*) => {{
$crate::span_of!(@helper $root, $parent, $(#$begin)* #$tt [] $($rest)*)
span_of!(@helper $root, $parent, $(#$begin)* #$tt [] $($rest)*)
}};
(@helper $root:ident, $parent:tt, [] $tt:tt $($rest:tt)*) => {{
$crate::span_of!(@helper $root, $parent, #$tt [] $($rest)*)
span_of!(@helper $root, $parent, #$tt [] $($rest)*)
}};
// Entry point.
($sty:tt, $($exp:tt)+) => ({
unsafe {
// Get a base pointer.
$crate::let_base_ptr!(root, $sty);
let_base_ptr!(root, $sty);
let base = root as usize;
let (begin, end) = $crate::span_of!(@helper root, $sty, [] $($exp)*);
let (begin, end) = span_of!(@helper root, $sty, [] $($exp)*);
begin-base..end-base
}
});