mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-22 23:04:33 +00:00
511 lines
18 KiB
Rust
511 lines
18 KiB
Rust
use cranelift_codegen::isa::TargetFrontendConfig;
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use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext};
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use rustc_index::IndexVec;
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use rustc_middle::ty::TypeFoldable;
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use rustc_middle::ty::layout::{
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self, FnAbiError, FnAbiOfHelpers, FnAbiRequest, LayoutError, LayoutOfHelpers,
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};
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use rustc_span::source_map::Spanned;
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use rustc_target::abi::call::FnAbi;
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use rustc_target::abi::{Float, Integer, Primitive};
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use rustc_target::spec::{HasTargetSpec, Target};
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use crate::constant::ConstantCx;
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use crate::debuginfo::FunctionDebugContext;
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use crate::prelude::*;
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pub(crate) fn pointer_ty(tcx: TyCtxt<'_>) -> types::Type {
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match tcx.data_layout.pointer_size.bits() {
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16 => types::I16,
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32 => types::I32,
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64 => types::I64,
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bits => bug!("ptr_sized_integer: unknown pointer bit size {}", bits),
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}
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}
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pub(crate) fn scalar_to_clif_type(tcx: TyCtxt<'_>, scalar: Scalar) -> Type {
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match scalar.primitive() {
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Primitive::Int(int, _sign) => match int {
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Integer::I8 => types::I8,
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Integer::I16 => types::I16,
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Integer::I32 => types::I32,
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Integer::I64 => types::I64,
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Integer::I128 => types::I128,
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},
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Primitive::Float(float) => match float {
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Float::F16 => unimplemented!("f16_f128"),
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Float::F32 => types::F32,
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Float::F64 => types::F64,
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Float::F128 => unimplemented!("f16_f128"),
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},
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// FIXME(erikdesjardins): handle non-default addrspace ptr sizes
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Primitive::Pointer(_) => pointer_ty(tcx),
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}
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}
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fn clif_type_from_ty<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Option<types::Type> {
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Some(match ty.kind() {
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ty::Bool => types::I8,
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ty::Uint(size) => match size {
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UintTy::U8 => types::I8,
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UintTy::U16 => types::I16,
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UintTy::U32 => types::I32,
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UintTy::U64 => types::I64,
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UintTy::U128 => types::I128,
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UintTy::Usize => pointer_ty(tcx),
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},
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ty::Int(size) => match size {
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IntTy::I8 => types::I8,
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IntTy::I16 => types::I16,
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IntTy::I32 => types::I32,
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IntTy::I64 => types::I64,
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IntTy::I128 => types::I128,
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IntTy::Isize => pointer_ty(tcx),
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},
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ty::Char => types::I32,
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ty::Float(size) => match size {
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FloatTy::F16 => unimplemented!("f16_f128"),
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FloatTy::F32 => types::F32,
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FloatTy::F64 => types::F64,
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FloatTy::F128 => unimplemented!("f16_f128"),
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},
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ty::FnPtr(..) => pointer_ty(tcx),
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ty::RawPtr(pointee_ty, _) | ty::Ref(_, pointee_ty, _) => {
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if has_ptr_meta(tcx, *pointee_ty) {
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return None;
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} else {
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pointer_ty(tcx)
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}
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}
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ty::Param(_) => bug!("ty param {:?}", ty),
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_ => return None,
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})
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}
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fn clif_pair_type_from_ty<'tcx>(
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tcx: TyCtxt<'tcx>,
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ty: Ty<'tcx>,
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) -> Option<(types::Type, types::Type)> {
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Some(match ty.kind() {
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ty::Tuple(types) if types.len() == 2 => {
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(clif_type_from_ty(tcx, types[0])?, clif_type_from_ty(tcx, types[1])?)
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}
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ty::RawPtr(pointee_ty, _) | ty::Ref(_, pointee_ty, _) => {
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if has_ptr_meta(tcx, *pointee_ty) {
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(pointer_ty(tcx), pointer_ty(tcx))
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} else {
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return None;
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}
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}
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_ => return None,
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})
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}
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/// Is a pointer to this type a wide ptr?
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pub(crate) fn has_ptr_meta<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> bool {
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if ty.is_sized(tcx, ParamEnv::reveal_all()) {
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return false;
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}
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let tail = tcx.struct_tail_for_codegen(ty, ParamEnv::reveal_all());
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match tail.kind() {
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ty::Foreign(..) => false,
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ty::Str | ty::Slice(..) | ty::Dynamic(..) => true,
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_ => bug!("unexpected unsized tail: {:?}", tail),
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}
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}
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pub(crate) fn codegen_icmp_imm(
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fx: &mut FunctionCx<'_, '_, '_>,
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intcc: IntCC,
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lhs: Value,
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rhs: i128,
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) -> Value {
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let lhs_ty = fx.bcx.func.dfg.value_type(lhs);
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if lhs_ty == types::I128 {
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// FIXME legalize `icmp_imm.i128` in Cranelift
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let (lhs_lsb, lhs_msb) = fx.bcx.ins().isplit(lhs);
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let (rhs_lsb, rhs_msb) = (rhs as u128 as u64 as i64, (rhs as u128 >> 64) as u64 as i64);
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match intcc {
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IntCC::Equal => {
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let lsb_eq = fx.bcx.ins().icmp_imm(IntCC::Equal, lhs_lsb, rhs_lsb);
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let msb_eq = fx.bcx.ins().icmp_imm(IntCC::Equal, lhs_msb, rhs_msb);
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fx.bcx.ins().band(lsb_eq, msb_eq)
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}
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IntCC::NotEqual => {
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let lsb_ne = fx.bcx.ins().icmp_imm(IntCC::NotEqual, lhs_lsb, rhs_lsb);
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let msb_ne = fx.bcx.ins().icmp_imm(IntCC::NotEqual, lhs_msb, rhs_msb);
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fx.bcx.ins().bor(lsb_ne, msb_ne)
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}
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_ => {
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// if msb_eq {
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// lsb_cc
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// } else {
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// msb_cc
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// }
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let msb_eq = fx.bcx.ins().icmp_imm(IntCC::Equal, lhs_msb, rhs_msb);
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let lsb_cc = fx.bcx.ins().icmp_imm(intcc, lhs_lsb, rhs_lsb);
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let msb_cc = fx.bcx.ins().icmp_imm(intcc, lhs_msb, rhs_msb);
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fx.bcx.ins().select(msb_eq, lsb_cc, msb_cc)
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}
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}
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} else {
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let rhs = rhs as i64; // Truncates on purpose in case rhs is actually an unsigned value
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fx.bcx.ins().icmp_imm(intcc, lhs, rhs)
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}
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}
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pub(crate) fn codegen_bitcast(fx: &mut FunctionCx<'_, '_, '_>, dst_ty: Type, val: Value) -> Value {
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let mut flags = MemFlags::new();
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flags.set_endianness(match fx.tcx.data_layout.endian {
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rustc_target::abi::Endian::Big => cranelift_codegen::ir::Endianness::Big,
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rustc_target::abi::Endian::Little => cranelift_codegen::ir::Endianness::Little,
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});
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fx.bcx.ins().bitcast(dst_ty, flags, val)
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}
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pub(crate) fn type_zero_value(bcx: &mut FunctionBuilder<'_>, ty: Type) -> Value {
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if ty == types::I128 {
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let zero = bcx.ins().iconst(types::I64, 0);
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bcx.ins().iconcat(zero, zero)
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} else {
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bcx.ins().iconst(ty, 0)
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}
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}
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pub(crate) fn type_min_max_value(
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bcx: &mut FunctionBuilder<'_>,
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ty: Type,
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signed: bool,
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) -> (Value, Value) {
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assert!(ty.is_int());
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if ty == types::I128 {
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if signed {
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let min = i128::MIN as u128;
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let min_lsb = bcx.ins().iconst(types::I64, min as u64 as i64);
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let min_msb = bcx.ins().iconst(types::I64, (min >> 64) as u64 as i64);
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let min = bcx.ins().iconcat(min_lsb, min_msb);
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let max = i128::MAX as u128;
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let max_lsb = bcx.ins().iconst(types::I64, max as u64 as i64);
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let max_msb = bcx.ins().iconst(types::I64, (max >> 64) as u64 as i64);
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let max = bcx.ins().iconcat(max_lsb, max_msb);
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return (min, max);
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} else {
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let min_half = bcx.ins().iconst(types::I64, 0);
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let min = bcx.ins().iconcat(min_half, min_half);
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let max_half = bcx.ins().iconst(types::I64, u64::MAX as i64);
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let max = bcx.ins().iconcat(max_half, max_half);
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return (min, max);
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}
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}
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let min = match (ty, signed) {
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(types::I8, false) | (types::I16, false) | (types::I32, false) | (types::I64, false) => {
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0i64
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}
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(types::I8, true) => i64::from(i8::MIN as u8),
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(types::I16, true) => i64::from(i16::MIN as u16),
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(types::I32, true) => i64::from(i32::MIN as u32),
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(types::I64, true) => i64::MIN,
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_ => unreachable!(),
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};
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let max = match (ty, signed) {
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(types::I8, false) => i64::from(u8::MAX),
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(types::I16, false) => i64::from(u16::MAX),
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(types::I32, false) => i64::from(u32::MAX),
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(types::I64, false) => u64::MAX as i64,
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(types::I8, true) => i64::from(i8::MAX as u8),
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(types::I16, true) => i64::from(i16::MAX as u16),
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(types::I32, true) => i64::from(i32::MAX as u32),
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(types::I64, true) => i64::MAX,
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_ => unreachable!(),
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};
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let (min, max) = (bcx.ins().iconst(ty, min), bcx.ins().iconst(ty, max));
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(min, max)
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}
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pub(crate) fn type_sign(ty: Ty<'_>) -> bool {
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match ty.kind() {
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ty::Ref(..) | ty::RawPtr(..) | ty::FnPtr(..) | ty::Char | ty::Uint(..) | ty::Bool => false,
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ty::Int(..) => true,
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ty::Float(..) => false, // `signed` is unused for floats
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_ => panic!("{}", ty),
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}
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}
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pub(crate) fn create_wrapper_function(
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module: &mut dyn Module,
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sig: Signature,
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wrapper_name: &str,
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callee_name: &str,
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) {
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let wrapper_func_id = module.declare_function(wrapper_name, Linkage::Export, &sig).unwrap();
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let callee_func_id = module.declare_function(callee_name, Linkage::Import, &sig).unwrap();
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let mut ctx = Context::new();
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ctx.func.signature = sig;
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{
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let mut func_ctx = FunctionBuilderContext::new();
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let mut bcx = FunctionBuilder::new(&mut ctx.func, &mut func_ctx);
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let block = bcx.create_block();
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bcx.switch_to_block(block);
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let func = &mut bcx.func.stencil;
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let args = func
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.signature
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.params
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.iter()
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.map(|param| func.dfg.append_block_param(block, param.value_type))
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.collect::<Vec<Value>>();
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let callee_func_ref = module.declare_func_in_func(callee_func_id, &mut bcx.func);
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let call_inst = bcx.ins().call(callee_func_ref, &args);
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let results = bcx.inst_results(call_inst).to_vec(); // Clone to prevent borrow error
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bcx.ins().return_(&results);
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bcx.seal_all_blocks();
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bcx.finalize();
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}
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module.define_function(wrapper_func_id, &mut ctx).unwrap();
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}
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pub(crate) struct FunctionCx<'m, 'clif, 'tcx: 'm> {
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pub(crate) cx: &'clif mut crate::CodegenCx,
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pub(crate) module: &'m mut dyn Module,
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pub(crate) tcx: TyCtxt<'tcx>,
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pub(crate) target_config: TargetFrontendConfig, // Cached from module
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pub(crate) pointer_type: Type, // Cached from module
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pub(crate) constants_cx: ConstantCx,
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pub(crate) func_debug_cx: Option<FunctionDebugContext>,
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pub(crate) instance: Instance<'tcx>,
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pub(crate) symbol_name: String,
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pub(crate) mir: &'tcx Body<'tcx>,
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pub(crate) fn_abi: &'tcx FnAbi<'tcx, Ty<'tcx>>,
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pub(crate) bcx: FunctionBuilder<'clif>,
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pub(crate) block_map: IndexVec<BasicBlock, Block>,
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pub(crate) local_map: IndexVec<Local, CPlace<'tcx>>,
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/// When `#[track_caller]` is used, the implicit caller location is stored in this variable.
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pub(crate) caller_location: Option<CValue<'tcx>>,
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pub(crate) clif_comments: crate::pretty_clif::CommentWriter,
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/// This should only be accessed by `CPlace::new_var`.
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pub(crate) next_ssa_var: u32,
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}
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impl<'tcx> LayoutOfHelpers<'tcx> for FunctionCx<'_, '_, 'tcx> {
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#[inline]
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fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
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RevealAllLayoutCx(self.tcx).handle_layout_err(err, span, ty)
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}
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}
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impl<'tcx> FnAbiOfHelpers<'tcx> for FunctionCx<'_, '_, 'tcx> {
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#[inline]
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fn handle_fn_abi_err(
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&self,
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err: FnAbiError<'tcx>,
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span: Span,
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fn_abi_request: FnAbiRequest<'tcx>,
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) -> ! {
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RevealAllLayoutCx(self.tcx).handle_fn_abi_err(err, span, fn_abi_request)
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}
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}
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impl<'tcx> layout::HasTyCtxt<'tcx> for FunctionCx<'_, '_, 'tcx> {
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fn tcx<'b>(&'b self) -> TyCtxt<'tcx> {
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self.tcx
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}
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}
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impl<'tcx> rustc_target::abi::HasDataLayout for FunctionCx<'_, '_, 'tcx> {
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fn data_layout(&self) -> &rustc_target::abi::TargetDataLayout {
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&self.tcx.data_layout
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}
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}
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impl<'tcx> layout::HasParamEnv<'tcx> for FunctionCx<'_, '_, 'tcx> {
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fn param_env(&self) -> ParamEnv<'tcx> {
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ParamEnv::reveal_all()
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}
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}
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impl<'tcx> HasTargetSpec for FunctionCx<'_, '_, 'tcx> {
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fn target_spec(&self) -> &Target {
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&self.tcx.sess.target
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}
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}
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impl<'tcx> FunctionCx<'_, '_, 'tcx> {
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pub(crate) fn monomorphize<T>(&self, value: T) -> T
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where
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T: TypeFoldable<TyCtxt<'tcx>> + Copy,
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{
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self.instance.instantiate_mir_and_normalize_erasing_regions(
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self.tcx,
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ty::ParamEnv::reveal_all(),
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ty::EarlyBinder::bind(value),
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)
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}
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pub(crate) fn clif_type(&self, ty: Ty<'tcx>) -> Option<Type> {
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clif_type_from_ty(self.tcx, ty)
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}
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pub(crate) fn clif_pair_type(&self, ty: Ty<'tcx>) -> Option<(Type, Type)> {
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clif_pair_type_from_ty(self.tcx, ty)
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}
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pub(crate) fn get_block(&self, bb: BasicBlock) -> Block {
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*self.block_map.get(bb).unwrap()
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}
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pub(crate) fn get_local_place(&mut self, local: Local) -> CPlace<'tcx> {
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*self.local_map.get(local).unwrap_or_else(|| {
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panic!("Local {:?} doesn't exist", local);
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})
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}
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pub(crate) fn create_stack_slot(&mut self, size: u32, align: u32) -> Pointer {
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let abi_align = if self.tcx.sess.target.arch == "s390x" { 8 } else { 16 };
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if align <= abi_align {
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let stack_slot = self.bcx.create_sized_stack_slot(StackSlotData {
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kind: StackSlotKind::ExplicitSlot,
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// FIXME Don't force the size to a multiple of <abi_align> bytes once Cranelift gets
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// a way to specify stack slot alignment.
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size: (size + abi_align - 1) / abi_align * abi_align,
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align_shift: 4,
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});
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Pointer::stack_slot(stack_slot)
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} else {
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// Alignment is too big to handle using the above hack. Dynamically realign a stack slot
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// instead. This wastes some space for the realignment.
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let stack_slot = self.bcx.create_sized_stack_slot(StackSlotData {
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kind: StackSlotKind::ExplicitSlot,
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// FIXME Don't force the size to a multiple of <abi_align> bytes once Cranelift gets
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// a way to specify stack slot alignment.
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size: (size + align) / abi_align * abi_align,
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align_shift: 4,
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});
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let base_ptr = self.bcx.ins().stack_addr(self.pointer_type, stack_slot, 0);
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let misalign_offset = self.bcx.ins().urem_imm(base_ptr, i64::from(align));
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let realign_offset = self.bcx.ins().irsub_imm(misalign_offset, i64::from(align));
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Pointer::new(self.bcx.ins().iadd(base_ptr, realign_offset))
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}
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}
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pub(crate) fn set_debug_loc(&mut self, source_info: mir::SourceInfo) {
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if let Some(debug_context) = &mut self.cx.debug_context {
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let (file_id, line, column) =
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debug_context.get_span_loc(self.tcx, self.mir.span, source_info.span);
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let source_loc =
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self.func_debug_cx.as_mut().unwrap().add_dbg_loc(file_id, line, column);
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self.bcx.set_srcloc(source_loc);
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}
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}
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pub(crate) fn get_caller_location(&mut self, source_info: mir::SourceInfo) -> CValue<'tcx> {
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self.mir.caller_location_span(source_info, self.caller_location, self.tcx, |span| {
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let const_loc = self.tcx.span_as_caller_location(span);
|
|
crate::constant::codegen_const_value(self, const_loc, self.tcx.caller_location_ty())
|
|
})
|
|
}
|
|
|
|
pub(crate) fn anonymous_str(&mut self, msg: &str) -> Value {
|
|
let mut data = DataDescription::new();
|
|
data.define(msg.as_bytes().to_vec().into_boxed_slice());
|
|
let msg_id = self.module.declare_anonymous_data(false, false).unwrap();
|
|
|
|
// Ignore DuplicateDefinition error, as the data will be the same
|
|
let _ = self.module.define_data(msg_id, &data);
|
|
|
|
let local_msg_id = self.module.declare_data_in_func(msg_id, self.bcx.func);
|
|
if self.clif_comments.enabled() {
|
|
self.add_comment(local_msg_id, msg);
|
|
}
|
|
self.bcx.ins().global_value(self.pointer_type, local_msg_id)
|
|
}
|
|
}
|
|
|
|
pub(crate) struct RevealAllLayoutCx<'tcx>(pub(crate) TyCtxt<'tcx>);
|
|
|
|
impl<'tcx> LayoutOfHelpers<'tcx> for RevealAllLayoutCx<'tcx> {
|
|
#[inline]
|
|
fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
|
|
if let LayoutError::SizeOverflow(_) | LayoutError::ReferencesError(_) = err {
|
|
self.0.sess.dcx().span_fatal(span, err.to_string())
|
|
} else {
|
|
self.0
|
|
.sess
|
|
.dcx()
|
|
.span_fatal(span, format!("failed to get layout for `{}`: {}", ty, err))
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'tcx> FnAbiOfHelpers<'tcx> for RevealAllLayoutCx<'tcx> {
|
|
#[inline]
|
|
fn handle_fn_abi_err(
|
|
&self,
|
|
err: FnAbiError<'tcx>,
|
|
span: Span,
|
|
fn_abi_request: FnAbiRequest<'tcx>,
|
|
) -> ! {
|
|
if let FnAbiError::Layout(LayoutError::SizeOverflow(_)) = err {
|
|
self.0.sess.dcx().emit_fatal(Spanned { span, node: err })
|
|
} else {
|
|
match fn_abi_request {
|
|
FnAbiRequest::OfFnPtr { sig, extra_args } => {
|
|
span_bug!(span, "`fn_abi_of_fn_ptr({sig}, {extra_args:?})` failed: {err:?}");
|
|
}
|
|
FnAbiRequest::OfInstance { instance, extra_args } => {
|
|
span_bug!(
|
|
span,
|
|
"`fn_abi_of_instance({instance}, {extra_args:?})` failed: {err:?}"
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'tcx> layout::HasTyCtxt<'tcx> for RevealAllLayoutCx<'tcx> {
|
|
fn tcx<'b>(&'b self) -> TyCtxt<'tcx> {
|
|
self.0
|
|
}
|
|
}
|
|
|
|
impl<'tcx> rustc_target::abi::HasDataLayout for RevealAllLayoutCx<'tcx> {
|
|
fn data_layout(&self) -> &rustc_target::abi::TargetDataLayout {
|
|
&self.0.data_layout
|
|
}
|
|
}
|
|
|
|
impl<'tcx> layout::HasParamEnv<'tcx> for RevealAllLayoutCx<'tcx> {
|
|
fn param_env(&self) -> ParamEnv<'tcx> {
|
|
ParamEnv::reveal_all()
|
|
}
|
|
}
|
|
|
|
impl<'tcx> HasTargetSpec for RevealAllLayoutCx<'tcx> {
|
|
fn target_spec(&self) -> &Target {
|
|
&self.0.sess.target
|
|
}
|
|
}
|