1 #![allow(non_camel_case_types)]
3 use rustc_hir::LangItem;
4 use rustc_middle::mir::interpret::ConstValue;
5 use rustc_middle::ty::{self, layout::TyAndLayout, Ty, TyCtxt};
11 #[derive(Copy, Clone)]
12 pub enum IntPredicate {
25 #[derive(Copy, Clone)]
26 pub enum RealPredicate {
45 #[derive(Copy, Clone)]
46 pub enum AtomicRmwBinOp {
60 #[derive(Copy, Clone)]
61 pub enum AtomicOrdering {
67 SequentiallyConsistent,
70 #[derive(Copy, Clone)]
71 pub enum SynchronizationScope {
76 #[derive(Copy, Clone, PartialEq, Debug)]
100 // FIXME(mw): Anything that is produced via DepGraph::with_task() must implement
101 // the HashStable trait. Normally DepGraph::with_task() calls are
102 // hidden behind queries, but CGU creation is a special case in two
103 // ways: (1) it's not a query and (2) CGU are output nodes, so their
104 // Fingerprints are not actually needed. It remains to be clarified
105 // how exactly this case will be handled in the red/green system but
106 // for now we content ourselves with providing a no-op HashStable
107 // implementation for CGUs.
108 mod temp_stable_hash_impls {
109 use crate::ModuleCodegen;
110 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
112 impl<HCX, M> HashStable<HCX> for ModuleCodegen<M> {
113 fn hash_stable(&self, _: &mut HCX, _: &mut StableHasher) {
119 pub fn build_langcall<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
123 ) -> (Bx::FnAbiOfResult, Bx::Value) {
125 let def_id = tcx.require_lang_item(li, span);
126 let instance = ty::Instance::mono(tcx, def_id);
127 (bx.fn_abi_of_instance(instance, ty::List::empty()), bx.get_fn_addr(instance))
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, 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, 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 asm_const_to_str<'tcx>(
197 const_value: ConstValue<'tcx>,
198 ty_and_layout: TyAndLayout<'tcx>,
200 let ConstValue::Scalar(scalar) = const_value else {
201 span_bug!(sp, "expected Scalar for promoted asm const, but got {:#?}", const_value)
203 let value = scalar.assert_bits(ty_and_layout.size);
204 match ty_and_layout.ty.kind() {
205 ty::Uint(_) => value.to_string(),
206 ty::Int(int_ty) => match int_ty.normalize(tcx.sess.target.pointer_width) {
207 ty::IntTy::I8 => (value as i8).to_string(),
208 ty::IntTy::I16 => (value as i16).to_string(),
209 ty::IntTy::I32 => (value as i32).to_string(),
210 ty::IntTy::I64 => (value as i64).to_string(),
211 ty::IntTy::I128 => (value as i128).to_string(),
212 ty::IntTy::Isize => unreachable!(),
214 _ => span_bug!(sp, "asm const has bad type {}", ty_and_layout.ty),