41 lines
1.3 KiB
Rust
41 lines
1.3 KiB
Rust
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use crate::const_eval::CompileTimeInterpreter;
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use crate::interpret::{InterpCx, MemoryKind, OpTy};
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use rustc_middle::ty::layout::LayoutCx;
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use rustc_middle::ty::{layout::TyAndLayout, ParamEnv, TyCtxt};
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use rustc_session::Limit;
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use rustc_target::abi::InitKind;
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pub fn might_permit_raw_init<'tcx>(
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tcx: TyCtxt<'tcx>,
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ty: TyAndLayout<'tcx>,
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kind: InitKind,
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) -> bool {
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let strict = tcx.sess.opts.unstable_opts.strict_init_checks;
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if strict {
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let machine = CompileTimeInterpreter::new(Limit::new(0), false);
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let mut cx = InterpCx::new(tcx, rustc_span::DUMMY_SP, ParamEnv::reveal_all(), machine);
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let allocated = cx
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.allocate(ty, MemoryKind::Machine(crate::const_eval::MemoryKind::Heap))
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.expect("OOM: failed to allocate for uninit check");
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if kind == InitKind::Zero {
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cx.write_bytes_ptr(
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allocated.ptr,
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std::iter::repeat(0_u8).take(ty.layout.size().bytes_usize()),
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)
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.expect("failed to write bytes for zero valid check");
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}
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let ot: OpTy<'_, _> = allocated.into();
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// Assume that if it failed, it's a validation failure.
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cx.validate_operand(&ot).is_ok()
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} else {
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let layout_cx = LayoutCx { tcx, param_env: ParamEnv::reveal_all() };
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ty.might_permit_raw_init(&layout_cx, kind)
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}
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}
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