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Use non-generic inner function for pointer formatting

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This commit is contained in:
jam1garner 2021-11-26 13:59:57 -05:00
parent 454cc5fb86
commit 37c8f254ed
1 changed files with 23 additions and 17 deletions
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40
library/core/src/fmt/mod.rs
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@ -2186,28 +2186,34 @@ impl Display for char {
#[stable(feature = "rust1", since = "1.0.0")]
impl<T: ?Sized> Pointer for *const T {
fn fmt(&self, f: &mut Formatter<'_>) -> Result {
let old_width = f.width;
let old_flags = f.flags;
/// Since the formatting will be identical for all pointer types, use a non-monomorphized
/// implementation for the actual formatting to reduce the amount of codegen work needed
fn inner(ptr: *const (), f: &mut Formatter<'_>) -> Result {
let old_width = f.width;
let old_flags = f.flags;
// The alternate flag is already treated by LowerHex as being special-
// it denotes whether to prefix with 0x. We use it to work out whether
// or not to zero extend, and then unconditionally set it to get the
// prefix.
if f.alternate() {
f.flags |= 1 << (FlagV1::SignAwareZeroPad as u32);
// The alternate flag is already treated by LowerHex as being special-
// it denotes whether to prefix with 0x. We use it to work out whether
// or not to zero extend, and then unconditionally set it to get the
// prefix.
if f.alternate() {
f.flags |= 1 << (FlagV1::SignAwareZeroPad as u32);
if f.width.is_none() {
f.width = Some((usize::BITS / 4) as usize + 2);
if f.width.is_none() {
f.width = Some((usize::BITS / 4) as usize + 2);
}
}
f.flags |= 1 << (FlagV1::Alternate as u32);
let ret = LowerHex::fmt(&(ptr as usize), f);
f.width = old_width;
f.flags = old_flags;
ret
}
f.flags |= 1 << (FlagV1::Alternate as u32);
let ret = LowerHex::fmt(&(*self as *const () as usize), f);
f.width = old_width;
f.flags = old_flags;
ret
inner(*self as *const (), f)
}
}