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