1 #![allow(non_camel_case_types, non_snake_case)]
3 use rustc::session::Session;
4 use rustc::ty::{Ty, TyCtxt};
9 use rustc::middle::lang_items::LangItem;
10 use rustc_hir::def_id::DefId;
12 use crate::traits::BuilderMethods;
15 use rustc_error_codes::*;
17 pub enum IntPredicate {
31 pub enum RealPredicate {
50 pub enum AtomicRmwBinOp {
64 pub enum AtomicOrdering {
69 // Consume, // Not specified yet.
73 SequentiallyConsistent,
76 pub enum SynchronizationScope {
77 // FIXME: figure out if this variant is needed at all.
84 #[derive(Copy, Clone, PartialEq, Debug)]
105 // FIXME(mw): Anything that is produced via DepGraph::with_task() must implement
106 // the HashStable trait. Normally DepGraph::with_task() calls are
107 // hidden behind queries, but CGU creation is a special case in two
108 // ways: (1) it's not a query and (2) CGU are output nodes, so their
109 // Fingerprints are not actually needed. It remains to be clarified
110 // how exactly this case will be handled in the red/green system but
111 // for now we content ourselves with providing a no-op HashStable
112 // implementation for CGUs.
113 mod temp_stable_hash_impls {
114 use crate::ModuleCodegen;
115 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
117 impl<HCX, M> HashStable<HCX> for ModuleCodegen<M> {
118 fn hash_stable(&self, _: &mut HCX, _: &mut StableHasher) {
124 pub fn langcall(tcx: TyCtxt<'_>, span: Option<Span>, msg: &str, li: LangItem) -> DefId {
125 tcx.lang_items().require(li).unwrap_or_else(|s| {
126 let msg = format!("{} {}", msg, s);
128 Some(span) => tcx.sess.span_fatal(span, &msg[..]),
129 None => tcx.sess.fatal(&msg[..]),
134 // To avoid UB from LLVM, these two functions mask RHS with an
135 // appropriate mask unconditionally (i.e., the fallback behavior for
136 // all shifts). For 32- and 64-bit types, this matches the semantics
137 // of Java. (See related discussion on #1877 and #10183.)
139 pub fn build_unchecked_lshift<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
144 let rhs = base::cast_shift_expr_rhs(bx, hir::BinOpKind::Shl, lhs, rhs);
145 // #1877, #10183: Ensure that input is always valid
146 let rhs = shift_mask_rhs(bx, rhs);
150 pub fn build_unchecked_rshift<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
156 let rhs = base::cast_shift_expr_rhs(bx, hir::BinOpKind::Shr, lhs, rhs);
157 // #1877, #10183: Ensure that input is always valid
158 let rhs = shift_mask_rhs(bx, rhs);
159 let is_signed = lhs_t.is_signed();
160 if is_signed { bx.ashr(lhs, rhs) } else { bx.lshr(lhs, rhs) }
163 fn shift_mask_rhs<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
167 let rhs_llty = bx.val_ty(rhs);
168 let shift_val = shift_mask_val(bx, rhs_llty, rhs_llty, false);
169 bx.and(rhs, shift_val)
172 pub fn shift_mask_val<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
178 let kind = bx.type_kind(llty);
180 TypeKind::Integer => {
181 // i8/u8 can shift by at most 7, i16/u16 by at most 15, etc.
182 let val = bx.int_width(llty) - 1;
184 bx.const_int(mask_llty, !val as i64)
186 bx.const_uint(mask_llty, val)
189 TypeKind::Vector => {
191 shift_mask_val(bx, bx.element_type(llty), bx.element_type(mask_llty), invert);
192 bx.vector_splat(bx.vector_length(mask_llty), mask)
194 _ => bug!("shift_mask_val: expected Integer or Vector, found {:?}", kind),
198 pub fn span_invalid_monomorphization_error(a: &Session, b: Span, c: &str) {
199 span_err!(a, b, E0511, "{}", c);