344 lines
13 KiB
Rust
344 lines
13 KiB
Rust
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use crate::prelude::*;
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pub fn codegen_intrinsic_call<'a, 'tcx: 'a>(
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fx: &mut FunctionCx<'a, 'tcx, impl Backend>,
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def_id: DefId,
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substs: &'tcx Substs,
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args: &[CValue<'tcx>],
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destination: Option<(CPlace<'tcx>, BasicBlock)>,
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) {
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let intrinsic = fx.tcx.item_name(def_id).as_str();
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let intrinsic = &intrinsic[..];
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let ret = match destination {
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Some((place, _)) => place,
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None => {
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// Insert non returning intrinsics here
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match intrinsic {
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"abort" => {
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fx.bcx.ins().trap(TrapCode::User(!0 - 1));
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}
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"unreachable" => {
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fx.bcx.ins().trap(TrapCode::User(!0 - 1));
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}
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_ => unimplemented!("unsupported instrinsic {}", intrinsic),
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}
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return;
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}
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};
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let u64_layout = fx.layout_of(fx.tcx.types.u64);
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let usize_layout = fx.layout_of(fx.tcx.types.usize);
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match intrinsic {
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"assume" => {
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assert_eq!(args.len(), 1);
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}
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"arith_offset" => {
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assert_eq!(args.len(), 2);
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let base = args[0].load_value(fx);
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let offset = args[1].load_value(fx);
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let res = fx.bcx.ins().iadd(base, offset);
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let res = CValue::ByVal(res, ret.layout());
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ret.write_cvalue(fx, res);
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}
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"likely" | "unlikely" => {
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assert_eq!(args.len(), 1);
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ret.write_cvalue(fx, args[0]);
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}
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"copy" | "copy_nonoverlapping" => {
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let elem_ty = substs.type_at(0);
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let elem_size: u64 = fx.layout_of(elem_ty).size.bytes();
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let elem_size = fx
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.bcx
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.ins()
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.iconst(fx.module.pointer_type(), elem_size as i64);
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assert_eq!(args.len(), 3);
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let src = args[0].load_value(fx);
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let dst = args[1].load_value(fx);
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let count = args[2].load_value(fx);
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let byte_amount = fx.bcx.ins().imul(count, elem_size);
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if intrinsic.ends_with("_nonoverlapping") {
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fx.bcx.call_memcpy(fx.isa, dst, src, byte_amount);
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} else {
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fx.bcx.call_memmove(fx.isa, dst, src, byte_amount);
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}
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}
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"discriminant_value" => {
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assert_eq!(args.len(), 1);
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let discr = crate::base::trans_get_discriminant(fx, args[0], ret.layout());
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ret.write_cvalue(fx, discr);
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}
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"size_of" => {
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assert_eq!(args.len(), 0);
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let size_of = fx.layout_of(substs.type_at(0)).size.bytes();
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let size_of = CValue::const_val(fx, usize_layout.ty, size_of as i64);
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ret.write_cvalue(fx, size_of);
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}
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"size_of_val" => {
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assert_eq!(args.len(), 1);
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let layout = fx.layout_of(substs.type_at(0));
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let size = match &layout.ty.sty {
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_ if !layout.is_unsized() => fx
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.bcx
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.ins()
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.iconst(fx.module.pointer_type(), layout.size.bytes() as i64),
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ty::Slice(elem) => {
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let len = args[0].load_value_pair(fx).1;
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let elem_size = fx.layout_of(elem).size.bytes();
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fx.bcx.ins().imul_imm(len, elem_size as i64)
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}
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ty::Dynamic(..) => crate::vtable::size_of_obj(fx, args[0]),
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ty => bug!("size_of_val for unknown unsized type {:?}", ty),
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};
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ret.write_cvalue(fx, CValue::ByVal(size, usize_layout));
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}
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"min_align_of" => {
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assert_eq!(args.len(), 0);
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let min_align = fx.layout_of(substs.type_at(0)).align.abi();
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let min_align = CValue::const_val(fx, usize_layout.ty, min_align as i64);
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ret.write_cvalue(fx, min_align);
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}
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"min_align_of_val" => {
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assert_eq!(args.len(), 1);
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let layout = fx.layout_of(substs.type_at(0));
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let align = match &layout.ty.sty {
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_ if !layout.is_unsized() => fx
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.bcx
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.ins()
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.iconst(fx.module.pointer_type(), layout.align.abi() as i64),
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ty::Slice(elem) => {
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let align = fx.layout_of(elem).align.abi() as i64;
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fx.bcx.ins().iconst(fx.module.pointer_type(), align)
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}
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ty::Dynamic(..) => crate::vtable::min_align_of_obj(fx, args[0]),
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ty => unimplemented!("min_align_of_val for {:?}", ty),
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};
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ret.write_cvalue(fx, CValue::ByVal(align, usize_layout));
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}
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"type_id" => {
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assert_eq!(args.len(), 0);
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let type_id = fx.tcx.type_id_hash(substs.type_at(0));
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let type_id = CValue::const_val(fx, u64_layout.ty, type_id as i64);
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ret.write_cvalue(fx, type_id);
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}
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_ if intrinsic.starts_with("unchecked_") => {
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assert_eq!(args.len(), 2);
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let bin_op = match intrinsic {
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"unchecked_div" => BinOp::Div,
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"unchecked_rem" => BinOp::Rem,
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"unchecked_shl" => BinOp::Shl,
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"unchecked_shr" => BinOp::Shr,
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_ => unimplemented!("intrinsic {}", intrinsic),
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};
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let res = match ret.layout().ty.sty {
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ty::Uint(_) => crate::base::trans_int_binop(
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fx,
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bin_op,
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args[0],
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args[1],
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ret.layout().ty,
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false,
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),
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ty::Int(_) => crate::base::trans_int_binop(
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fx,
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bin_op,
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args[0],
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args[1],
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ret.layout().ty,
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true,
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),
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_ => panic!(),
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};
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ret.write_cvalue(fx, res);
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}
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_ if intrinsic.ends_with("_with_overflow") => {
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assert_eq!(args.len(), 2);
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assert_eq!(args[0].layout().ty, args[1].layout().ty);
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let bin_op = match intrinsic {
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"add_with_overflow" => BinOp::Add,
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"sub_with_overflow" => BinOp::Sub,
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"mul_with_overflow" => BinOp::Mul,
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_ => unimplemented!("intrinsic {}", intrinsic),
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};
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let res = match args[0].layout().ty.sty {
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ty::Uint(_) => crate::base::trans_checked_int_binop(
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fx,
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bin_op,
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args[0],
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args[1],
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ret.layout().ty,
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false,
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),
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ty::Int(_) => crate::base::trans_checked_int_binop(
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fx,
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bin_op,
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args[0],
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args[1],
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ret.layout().ty,
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true,
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),
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_ => panic!(),
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};
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ret.write_cvalue(fx, res);
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}
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_ if intrinsic.starts_with("overflowing_") => {
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assert_eq!(args.len(), 2);
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assert_eq!(args[0].layout().ty, args[1].layout().ty);
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let bin_op = match intrinsic {
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"overflowing_add" => BinOp::Add,
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"overflowing_sub" => BinOp::Sub,
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"overflowing_mul" => BinOp::Mul,
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_ => unimplemented!("intrinsic {}", intrinsic),
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};
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let res = match args[0].layout().ty.sty {
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ty::Uint(_) => crate::base::trans_int_binop(
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fx,
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bin_op,
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args[0],
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args[1],
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ret.layout().ty,
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false,
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),
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ty::Int(_) => crate::base::trans_int_binop(
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fx,
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bin_op,
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args[0],
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args[1],
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ret.layout().ty,
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true,
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),
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_ => panic!(),
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};
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ret.write_cvalue(fx, res);
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}
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"offset" => {
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assert_eq!(args.len(), 2);
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let base = args[0].load_value(fx);
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let offset = args[1].load_value(fx);
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let res = fx.bcx.ins().iadd(base, offset);
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ret.write_cvalue(fx, CValue::ByVal(res, args[0].layout()));
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}
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"transmute" => {
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assert_eq!(args.len(), 1);
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let src_ty = substs.type_at(0);
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let dst_ty = substs.type_at(1);
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assert_eq!(args[0].layout().ty, src_ty);
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let addr = args[0].force_stack(fx);
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let dst_layout = fx.layout_of(dst_ty);
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ret.write_cvalue(fx, CValue::ByRef(addr, dst_layout))
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}
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"init" => {
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assert_eq!(args.len(), 0);
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let ty = substs.type_at(0);
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let layout = fx.layout_of(ty);
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let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
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kind: StackSlotKind::ExplicitSlot,
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size: layout.size.bytes() as u32,
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offset: None,
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});
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let addr = fx.bcx.ins().stack_addr(pointer_ty(fx.tcx), stack_slot, 0);
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let zero_val = fx.bcx.ins().iconst(types::I8, 0);
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let len_val = fx.bcx.ins().iconst(pointer_ty(fx.tcx), layout.size.bytes() as i64);
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fx.bcx.call_memset(fx.isa, addr, zero_val, len_val);
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let uninit_place = CPlace::from_stack_slot(fx, stack_slot, ty);
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let uninit_val = uninit_place.to_cvalue(fx);
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ret.write_cvalue(fx, uninit_val);
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}
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"uninit" => {
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assert_eq!(args.len(), 0);
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let ty = substs.type_at(0);
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let layout = fx.layout_of(ty);
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let stack_slot = fx.bcx.create_stack_slot(StackSlotData {
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kind: StackSlotKind::ExplicitSlot,
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size: layout.size.bytes() as u32,
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offset: None,
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});
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let uninit_place = CPlace::from_stack_slot(fx, stack_slot, ty);
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let uninit_val = uninit_place.to_cvalue(fx);
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ret.write_cvalue(fx, uninit_val);
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}
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"ctlz" | "ctlz_nonzero" => {
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assert_eq!(args.len(), 1);
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let arg = args[0].load_value(fx);
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let res = CValue::ByVal(fx.bcx.ins().clz(arg), args[0].layout());
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ret.write_cvalue(fx, res);
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}
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"cttz" | "cttz_nonzero" => {
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assert_eq!(args.len(), 1);
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let arg = args[0].load_value(fx);
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let res = CValue::ByVal(fx.bcx.ins().clz(arg), args[0].layout());
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ret.write_cvalue(fx, res);
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}
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"ctpop" => {
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assert_eq!(args.len(), 1);
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let arg = args[0].load_value(fx);
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let res = CValue::ByVal(fx.bcx.ins().popcnt(arg), args[0].layout());
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ret.write_cvalue(fx, res);
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}
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"bitreverse" => {
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assert_eq!(args.len(), 1);
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let arg = args[0].load_value(fx);
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let res = CValue::ByVal(fx.bcx.ins().bitrev(arg), args[0].layout());
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ret.write_cvalue(fx, res);
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}
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"needs_drop" => {
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assert_eq!(args.len(), 0);
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let ty = substs.type_at(0);
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let needs_drop = if ty.needs_drop(fx.tcx, ParamEnv::reveal_all()) {
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1
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} else {
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0
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};
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let needs_drop = CValue::const_val(fx, fx.tcx.types.bool, needs_drop);
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ret.write_cvalue(fx, needs_drop);
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}
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_ if intrinsic.starts_with("atomic_fence") => {}
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_ if intrinsic.starts_with("atomic_singlethreadfence") => {}
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_ if intrinsic.starts_with("atomic_load") => {
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assert_eq!(args.len(), 1);
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let inner_layout =
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fx.layout_of(args[0].layout().ty.builtin_deref(true).unwrap().ty);
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let val = CValue::ByRef(args[0].load_value(fx), inner_layout);
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ret.write_cvalue(fx, val);
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}
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_ if intrinsic.starts_with("atomic_store") => {
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assert_eq!(args.len(), 2);
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let dest = CPlace::Addr(args[0].load_value(fx), None, args[1].layout());
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dest.write_cvalue(fx, args[1]);
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}
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_ if intrinsic.starts_with("atomic_xadd") => {
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assert_eq!(args.len(), 2);
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let clif_ty = fx.cton_type(substs.type_at(0)).unwrap();
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let ptr = args[0].load_value(fx);
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let amount = args[1].load_value(fx);
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let old = fx.bcx.ins().load(clif_ty, MemFlags::new(), ptr, 0);
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let new = fx.bcx.ins().iadd(old, amount);
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fx.bcx.ins().store(MemFlags::new(), new, ptr, 0);
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ret.write_cvalue(fx, CValue::ByVal(old, fx.layout_of(substs.type_at(0))));
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}
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_ if intrinsic.starts_with("atomic_xsub") => {
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assert_eq!(args.len(), 2);
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let clif_ty = fx.cton_type(substs.type_at(0)).unwrap();
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let ptr = args[0].load_value(fx);
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let amount = args[1].load_value(fx);
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let old = fx.bcx.ins().load(clif_ty, MemFlags::new(), ptr, 0);
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let new = fx.bcx.ins().isub(old, amount);
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fx.bcx.ins().store(MemFlags::new(), new, ptr, 0);
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ret.write_cvalue(fx, CValue::ByVal(old, fx.layout_of(substs.type_at(0))));
|
||
|
|
}
|
||
|
|
_ => unimpl!("unsupported intrinsic {}", intrinsic),
|
||
|
|
}
|
||
|
|
|
||
|
|
if let Some((_, dest)) = destination {
|
||
|
|
let ret_ebb = fx.get_ebb(dest);
|
||
|
|
fx.bcx.ins().jump(ret_ebb, &[]);
|
||
|
|
} else {
|
||
|
|
fx.bcx.ins().trap(TrapCode::User(!0));
|
||
|
|
}
|
||
|
|
}
|