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| 1 | +use rustc_abi::Abi; |
| 2 | +use rustc_middle::ty::{self, Instance, InstanceKind, Ty, TyCtxt}; |
| 3 | +use rustc_span::{def_id::DefId, Span, Symbol}; |
| 4 | +use rustc_target::abi::call::{FnAbi, PassMode}; |
| 5 | + |
| 6 | +use crate::errors::{AbiErrorDisabledVectorTypeCall, AbiErrorDisabledVectorTypeDef}; |
| 7 | + |
| 8 | +const SSE_FEATURES: &'static [&'static str] = &["sse", "sse2", "ssse3", "sse3", "sse4.1", "sse4.2"]; |
| 9 | +const AVX_FEATURES: &'static [&'static str] = &["avx", "avx2", "f16c", "fma"]; |
| 10 | +const AVX512_FEATURES: &'static [&'static str] = &[ |
| 11 | + "avx512f", |
| 12 | + "avx512bw", |
| 13 | + "avx512cd", |
| 14 | + "avx512er", |
| 15 | + "avx512pf", |
| 16 | + "avx512vl", |
| 17 | + "avx512dq", |
| 18 | + "avx512ifma", |
| 19 | + "avx512vbmi", |
| 20 | + "avx512vnni", |
| 21 | + "avx512bitalg", |
| 22 | + "avx512vpopcntdq", |
| 23 | + "avx512bf16", |
| 24 | + "avx512vbmi2", |
| 25 | +]; |
| 26 | + |
| 27 | +fn do_check_abi<'tcx>( |
| 28 | + tcx: TyCtxt<'tcx>, |
| 29 | + abi: &FnAbi<'tcx, Ty<'tcx>>, |
| 30 | + target_feature_def: DefId, |
| 31 | + emit_err: impl Fn(&'static str), |
| 32 | +) { |
| 33 | + // This check is a no-op on non-x86, at least for now. |
| 34 | + if tcx.sess.target.arch != "x86" && tcx.sess.target.arch != "x86_64" { |
| 35 | + return; |
| 36 | + } |
| 37 | + let codegen_attrs = tcx.codegen_fn_attrs(target_feature_def); |
| 38 | + for arg_abi in abi.args.iter().chain(std::iter::once(&abi.ret)) { |
| 39 | + let size = arg_abi.layout.size; |
| 40 | + if matches!(arg_abi.layout.abi, Abi::Vector { .. }) |
| 41 | + && matches!(arg_abi.mode, PassMode::Direct(_)) |
| 42 | + { |
| 43 | + let features: &[_] = match size.bits() { |
| 44 | + x if x <= 128 => &[SSE_FEATURES, AVX_FEATURES, AVX512_FEATURES], |
| 45 | + x if x <= 256 => &[AVX_FEATURES, AVX512_FEATURES], |
| 46 | + x if x <= 512 => &[AVX512_FEATURES], |
| 47 | + _ => { |
| 48 | + panic!("Unknown vector size for x86: {}; arg = {:?}", size.bits(), arg_abi) |
| 49 | + } |
| 50 | + }; |
| 51 | + let required_feature = features.iter().map(|x| x.iter()).flatten().next().unwrap(); |
| 52 | + if !features.iter().map(|x| x.iter()).flatten().any(|feature| { |
| 53 | + let required_feature_sym = Symbol::intern(feature); |
| 54 | + tcx.sess.unstable_target_features.contains(&required_feature_sym) |
| 55 | + || codegen_attrs.target_features.contains(&required_feature_sym) |
| 56 | + }) { |
| 57 | + emit_err(required_feature); |
| 58 | + } |
| 59 | + } |
| 60 | + } |
| 61 | +} |
| 62 | + |
| 63 | +/// Checks that the ABI of a given instance of a function does not contain vector-passed arguments |
| 64 | +/// or return values for which the corresponding target feature is not enabled. |
| 65 | +pub fn check_instance_abi<'tcx>(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) { |
| 66 | + let InstanceKind::Item(item_def) = instance.def else { |
| 67 | + return; |
| 68 | + }; |
| 69 | + |
| 70 | + let param_env = tcx.param_env(item_def); |
| 71 | + let Ok(abi) = tcx.fn_abi_of_instance(param_env.and((instance, ty::List::empty()))) else { |
| 72 | + // an error will be reported somewhere else if we cannot determine the ABI of this |
| 73 | + // function. |
| 74 | + return; |
| 75 | + }; |
| 76 | + do_check_abi(tcx, abi, item_def, |required_feature| { |
| 77 | + tcx.dcx().emit_err(AbiErrorDisabledVectorTypeDef { |
| 78 | + span: tcx.def_span(item_def), |
| 79 | + required_feature, |
| 80 | + }); |
| 81 | + }) |
| 82 | +} |
| 83 | + |
| 84 | +/// Checks that a call expression does not try to pass a vector-passed argument which requires a |
| 85 | +/// target feature that the caller does not have, as doing so causes UB because of ABI mismatch. |
| 86 | +pub fn check_call_abi<'tcx>( |
| 87 | + tcx: TyCtxt<'tcx>, |
| 88 | + ty: Ty<'tcx>, |
| 89 | + span: Span, |
| 90 | + caller: InstanceKind<'tcx>, |
| 91 | +) { |
| 92 | + let InstanceKind::Item(caller_def) = caller else { |
| 93 | + return; |
| 94 | + }; |
| 95 | + let param_env = tcx.param_env(caller_def); |
| 96 | + let callee_abi = match *ty.kind() { |
| 97 | + ty::FnPtr(sig) => tcx.fn_abi_of_fn_ptr(param_env.and((sig, ty::List::empty()))), |
| 98 | + ty::FnDef(def_id, args) => { |
| 99 | + // Intrinsics are handled separately by the compiler. |
| 100 | + if tcx.intrinsic(def_id).is_some() { |
| 101 | + return; |
| 102 | + } |
| 103 | + let Ok(Some(instance)) = ty::Instance::try_resolve(tcx, param_env, def_id, args) else { |
| 104 | + return; |
| 105 | + }; |
| 106 | + tcx.fn_abi_of_instance(param_env.and((instance, ty::List::empty()))) |
| 107 | + } |
| 108 | + _ => { |
| 109 | + panic!("Invalid function call"); |
| 110 | + } |
| 111 | + }; |
| 112 | + |
| 113 | + let Ok(callee_abi) = callee_abi else { |
| 114 | + return; |
| 115 | + }; |
| 116 | + do_check_abi(tcx, callee_abi, caller_def, |required_feature| { |
| 117 | + tcx.dcx().emit_err(AbiErrorDisabledVectorTypeCall { span, required_feature }); |
| 118 | + }) |
| 119 | +} |
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