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Minor code simplification; avoid an unneeded match.

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This commit is contained in:
Dan Gohman
2018-09-12 16:06:03 -07:00
parent d0f703a6ff
commit 9e65b694bd
1 changed files with 43 additions and 46 deletions
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89
lib/simplejit/src/backend.rs
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@@ -350,53 +350,50 @@ impl<'simple_jit_backend> Backend for SimpleJITBackend {
) -> Self::FinalizedData {
use std::ptr::write_unaligned;
for record in &data.relocs {
match *record {
RelocRecord {
reloc,
offset,
ref name,
addend,
} => {
let ptr = data.storage;
debug_assert!((offset as usize) < data.size);
let at = unsafe { ptr.offset(offset as isize) };
let base = if namespace.is_function(name) {
let (def, name_str, _signature) = namespace.get_function_definition(&name);
match def {
Some(compiled) => compiled.code,
None => self.lookup_symbol(name_str),
}
} else {
let (def, name_str, _writable) = namespace.get_data_definition(&name);
match def {
Some(compiled) => compiled.storage,
None => self.lookup_symbol(name_str),
}
};
// TODO: Handle overflow.
let what = unsafe { base.offset(addend as isize) };
match reloc {
Reloc::Abs4 => {
// TODO: Handle overflow.
#[cfg_attr(feature = "cargo-clippy", allow(cast_ptr_alignment))]
unsafe {
write_unaligned(at as *mut u32, what as u32)
};
}
Reloc::Abs8 => {
#[cfg_attr(feature = "cargo-clippy", allow(cast_ptr_alignment))]
unsafe {
write_unaligned(at as *mut u64, what as u64)
};
}
Reloc::X86PCRel4
| Reloc::X86CallPCRel4
| Reloc::X86GOTPCRel4
| Reloc::X86CallPLTRel4 => panic!("unexpected text relocation in data"),
_ => unimplemented!(),
}
for &RelocRecord {
reloc,
offset,
ref name,
addend,
} in &data.relocs
{
let ptr = data.storage;
debug_assert!((offset as usize) < data.size);
let at = unsafe { ptr.offset(offset as isize) };
let base = if namespace.is_function(name) {
let (def, name_str, _signature) = namespace.get_function_definition(&name);
match def {
Some(compiled) => compiled.code,
None => self.lookup_symbol(name_str),
}
} else {
let (def, name_str, _writable) = namespace.get_data_definition(&name);
match def {
Some(compiled) => compiled.storage,
None => self.lookup_symbol(name_str),
}
};
// TODO: Handle overflow.
let what = unsafe { base.offset(addend as isize) };
match reloc {
Reloc::Abs4 => {
// TODO: Handle overflow.
#[cfg_attr(feature = "cargo-clippy", allow(cast_ptr_alignment))]
unsafe {
write_unaligned(at as *mut u32, what as u32)
};
}
Reloc::Abs8 => {
#[cfg_attr(feature = "cargo-clippy", allow(cast_ptr_alignment))]
unsafe {
write_unaligned(at as *mut u64, what as u64)
};
}
Reloc::X86PCRel4
| Reloc::X86CallPCRel4
| Reloc::X86GOTPCRel4
| Reloc::X86CallPLTRel4 => panic!("unexpected text relocation in data"),
_ => unimplemented!(),
}
}
(data.storage, data.size)