1 #![allow(non_camel_case_types)]
3 use rustc_errors::struct_span_err;
5 use rustc_hir::def_id::DefId;
6 use rustc_hir::LangItem;
7 use rustc_middle::ty::{Ty, TyCtxt};
8 use rustc_session::Session;
12 use crate::traits::BuilderMethods;
15 pub enum IntPredicate {
28 pub enum RealPredicate {
47 pub enum AtomicRmwBinOp {
61 pub enum AtomicOrdering {
65 // Consume, // Not specified yet.
69 SequentiallyConsistent,
72 pub enum SynchronizationScope {
77 #[derive(Copy, Clone, PartialEq, Debug)]
101 // FIXME(mw): Anything that is produced via DepGraph::with_task() must implement
102 // the HashStable trait. Normally DepGraph::with_task() calls are
103 // hidden behind queries, but CGU creation is a special case in two
104 // ways: (1) it's not a query and (2) CGU are output nodes, so their
105 // Fingerprints are not actually needed. It remains to be clarified
106 // how exactly this case will be handled in the red/green system but
107 // for now we content ourselves with providing a no-op HashStable
108 // implementation for CGUs.
109 mod temp_stable_hash_impls {
110 use crate::ModuleCodegen;
111 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
113 impl<HCX, M> HashStable<HCX> for ModuleCodegen<M> {
114 fn hash_stable(&self, _: &mut HCX, _: &mut StableHasher) {
120 pub fn langcall(tcx: TyCtxt<'_>, span: Option<Span>, msg: &str, li: LangItem) -> DefId {
121 tcx.lang_items().require(li).unwrap_or_else(|s| {
122 let msg = format!("{} {}", msg, s);
124 Some(span) => tcx.sess.span_fatal(span, &msg[..]),
125 None => tcx.sess.fatal(&msg[..]),
130 // To avoid UB from LLVM, these two functions mask RHS with an
131 // appropriate mask unconditionally (i.e., the fallback behavior for
132 // all shifts). For 32- and 64-bit types, this matches the semantics
133 // of Java. (See related discussion on #1877 and #10183.)
135 pub fn build_unchecked_lshift<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
140 let rhs = base::cast_shift_expr_rhs(bx, hir::BinOpKind::Shl, lhs, rhs);
141 // #1877, #10183: Ensure that input is always valid
142 let rhs = shift_mask_rhs(bx, rhs);
146 pub fn build_unchecked_rshift<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
152 let rhs = base::cast_shift_expr_rhs(bx, hir::BinOpKind::Shr, lhs, rhs);
153 // #1877, #10183: Ensure that input is always valid
154 let rhs = shift_mask_rhs(bx, rhs);
155 let is_signed = lhs_t.is_signed();
156 if is_signed { bx.ashr(lhs, rhs) } else { bx.lshr(lhs, rhs) }
159 fn shift_mask_rhs<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
163 let rhs_llty = bx.val_ty(rhs);
164 let shift_val = shift_mask_val(bx, rhs_llty, rhs_llty, false);
165 bx.and(rhs, shift_val)
168 pub fn shift_mask_val<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
174 let kind = bx.type_kind(llty);
176 TypeKind::Integer => {
177 // i8/u8 can shift by at most 7, i16/u16 by at most 15, etc.
178 let val = bx.int_width(llty) - 1;
180 bx.const_int(mask_llty, !val as i64)
182 bx.const_uint(mask_llty, val)
185 TypeKind::Vector => {
187 shift_mask_val(bx, bx.element_type(llty), bx.element_type(mask_llty), invert);
188 bx.vector_splat(bx.vector_length(mask_llty), mask)
190 _ => bug!("shift_mask_val: expected Integer or Vector, found {:?}", kind),
194 pub fn span_invalid_monomorphization_error(a: &Session, b: Span, c: &str) {
195 struct_span_err!(a, b, E0511, "{}", c).emit();