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Use precomputed layouts.

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This commit is contained in:
Mateusz Gienieczko
2022-05-22 01:01:12 +02:00
parent a40ff562a0
commit bd731508d4
1 changed files with 4 additions and 9 deletions
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src/shims/windows/foreign_items.rs
+4 -9
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@@ -112,8 +112,6 @@ fn emulate_foreign_item_by_name(
// Querying system information
"GetSystemInfo" => {
use crate::rustc_middle::ty::{layout::LayoutOf, TyKind, UintTy};
let [system_info] =
this.check_shim(abi, Abi::System { unwind: false }, link_name, args)?;
let system_info = this.deref_operand(system_info)?;
@@ -123,16 +121,13 @@ fn emulate_foreign_item_by_name(
iter::repeat(0u8).take(system_info.layout.size.bytes() as usize),
)?;
// Set selected fields.
let word_ty = this.tcx.mk_ty(TyKind::Uint(UintTy::U16));
let dword_ty = this.tcx.mk_ty(TyKind::Uint(UintTy::U32));
let usize_ty = this.tcx.mk_ty(TyKind::Uint(UintTy::Usize));
let word_layout = this.layout_of(word_ty)?;
let dword_layout = this.layout_of(dword_ty)?;
let usize_layout = this.layout_of(usize_ty)?;
let word_layout = this.machine.layouts.u16;
let dword_layout = this.machine.layouts.u32;
let usize_layout = this.machine.layouts.usize;
// Using `mplace_field` is error-prone, see: https://github.com/rust-lang/miri/issues/2136.
// Pointer fields have different sizes on different targets.
// To avoid all these issue we calculate the offsets dynamically.
// To avoid all these issue we calculate the offsets ourselves.
let field_sizes = [
word_layout.size, // 0, wProcessorArchitecture : WORD
word_layout.size, // 1, wReserved : WORD