699 lines
27 KiB
Rust
699 lines
27 KiB
Rust
use rustc::mir;
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use rustc::traits::Reveal;
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use rustc::ty::layout::{TyLayout, LayoutOf};
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use rustc::ty;
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use rustc::mir::interpret::{EvalResult, PrimVal, PrimValKind, Value, Pointer};
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use rustc_mir::interpret::{Place, PlaceExtra, HasMemory, EvalContext, ValTy};
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use helpers::EvalContextExt as HelperEvalContextExt;
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pub trait EvalContextExt<'tcx> {
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fn call_intrinsic(
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&mut self,
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instance: ty::Instance<'tcx>,
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args: &[ValTy<'tcx>],
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dest: Place,
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dest_layout: TyLayout<'tcx>,
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target: mir::BasicBlock,
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) -> EvalResult<'tcx>;
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}
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impl<'a, 'tcx> EvalContextExt<'tcx> for EvalContext<'a, 'tcx, super::Evaluator<'tcx>> {
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fn call_intrinsic(
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&mut self,
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instance: ty::Instance<'tcx>,
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args: &[ValTy<'tcx>],
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dest: Place,
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dest_layout: TyLayout<'tcx>,
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target: mir::BasicBlock,
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) -> EvalResult<'tcx> {
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let substs = instance.substs;
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let intrinsic_name = &self.tcx.item_name(instance.def_id())[..];
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match intrinsic_name {
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"align_offset" => {
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// FIXME: return a real value in case the target allocation has an
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// alignment bigger than the one requested
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self.write_primval(dest, PrimVal::Bytes(u128::max_value()), dest_layout.ty)?;
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},
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"add_with_overflow" => {
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self.intrinsic_with_overflow(
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mir::BinOp::Add,
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args[0],
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args[1],
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dest,
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dest_layout.ty,
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)?
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}
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"sub_with_overflow" => {
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self.intrinsic_with_overflow(
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mir::BinOp::Sub,
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args[0],
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args[1],
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dest,
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dest_layout.ty,
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)?
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}
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"mul_with_overflow" => {
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self.intrinsic_with_overflow(
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mir::BinOp::Mul,
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args[0],
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args[1],
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dest,
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dest_layout.ty,
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)?
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}
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"arith_offset" => {
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let offset = self.value_to_primval(args[1])?.to_i128()? as i64;
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let ptr = self.into_ptr(args[0].value)?;
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let result_ptr = self.wrapping_pointer_offset(ptr, substs.type_at(0), offset)?;
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self.write_ptr(dest, result_ptr, dest_layout.ty)?;
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}
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"assume" => {
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let cond = self.value_to_primval(args[0])?.to_bool()?;
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if !cond {
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return err!(AssumptionNotHeld);
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}
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}
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"atomic_load" |
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"atomic_load_relaxed" |
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"atomic_load_acq" |
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"volatile_load" => {
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let ptr = self.into_ptr(args[0].value)?;
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let align = self.layout_of(args[0].ty)?.align;
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let valty = ValTy {
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value: Value::ByRef(ptr, align),
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ty: substs.type_at(0),
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};
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self.write_value(valty, dest)?;
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}
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"atomic_store" |
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"atomic_store_relaxed" |
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"atomic_store_rel" |
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"volatile_store" => {
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let ty = substs.type_at(0);
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let align = self.layout_of(ty)?.align;
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let dest = self.into_ptr(args[0].value)?;
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self.write_value_to_ptr(args[1].value, dest, align, ty)?;
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}
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"atomic_fence_acq" => {
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// we are inherently singlethreaded and singlecored, this is a nop
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}
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_ if intrinsic_name.starts_with("atomic_xchg") => {
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let ty = substs.type_at(0);
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let align = self.layout_of(ty)?.align;
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let ptr = self.into_ptr(args[0].value)?;
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let change = self.value_to_primval(args[1])?;
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let old = self.read_value(ptr, align, ty)?;
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let old = match old {
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Value::ByVal(val) => val,
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Value::ByRef { .. } => bug!("just read the value, can't be byref"),
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Value::ByValPair(..) => bug!("atomic_xchg doesn't work with nonprimitives"),
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};
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self.write_primval(dest, old, ty)?;
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self.write_primval(
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Place::from_primval_ptr(ptr, align),
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change,
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ty,
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)?;
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}
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_ if intrinsic_name.starts_with("atomic_cxchg") => {
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let ty = substs.type_at(0);
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let align = self.layout_of(ty)?.align;
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let ptr = self.into_ptr(args[0].value)?;
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let expect_old = self.value_to_primval(args[1])?;
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let change = self.value_to_primval(args[2])?;
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let old = self.read_value(ptr, align, ty)?;
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let old = match old {
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Value::ByVal(val) => val,
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Value::ByRef { .. } => bug!("just read the value, can't be byref"),
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Value::ByValPair(..) => bug!("atomic_cxchg doesn't work with nonprimitives"),
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};
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let (val, _) = self.binary_op(mir::BinOp::Eq, old, ty, expect_old, ty)?;
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let valty = ValTy {
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value: Value::ByValPair(old, val),
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ty: dest_layout.ty,
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};
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self.write_value(valty, dest)?;
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self.write_primval(
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Place::from_primval_ptr(ptr, dest_layout.align),
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change,
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ty,
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)?;
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}
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"atomic_or" |
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"atomic_or_acq" |
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"atomic_or_rel" |
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"atomic_or_acqrel" |
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"atomic_or_relaxed" |
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"atomic_xor" |
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"atomic_xor_acq" |
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"atomic_xor_rel" |
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"atomic_xor_acqrel" |
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"atomic_xor_relaxed" |
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"atomic_and" |
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"atomic_and_acq" |
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"atomic_and_rel" |
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"atomic_and_acqrel" |
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"atomic_and_relaxed" |
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"atomic_xadd" |
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"atomic_xadd_acq" |
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"atomic_xadd_rel" |
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"atomic_xadd_acqrel" |
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"atomic_xadd_relaxed" |
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"atomic_xsub" |
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"atomic_xsub_acq" |
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"atomic_xsub_rel" |
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"atomic_xsub_acqrel" |
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"atomic_xsub_relaxed" => {
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let ty = substs.type_at(0);
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let align = self.layout_of(ty)?.align;
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let ptr = self.into_ptr(args[0].value)?;
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let change = self.value_to_primval(args[1])?;
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let old = self.read_value(ptr, align, ty)?;
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let old = match old {
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Value::ByVal(val) => val,
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Value::ByRef { .. } => bug!("just read the value, can't be byref"),
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Value::ByValPair(..) => {
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bug!("atomic_xadd_relaxed doesn't work with nonprimitives")
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}
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};
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self.write_primval(dest, old, ty)?;
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let op = match intrinsic_name.split('_').nth(1).unwrap() {
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"or" => mir::BinOp::BitOr,
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"xor" => mir::BinOp::BitXor,
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"and" => mir::BinOp::BitAnd,
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"xadd" => mir::BinOp::Add,
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"xsub" => mir::BinOp::Sub,
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_ => bug!(),
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};
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// FIXME: what do atomics do on overflow?
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let (val, _) = self.binary_op(op, old, ty, change, ty)?;
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self.write_primval(Place::from_primval_ptr(ptr, dest_layout.align), val, ty)?;
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}
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"breakpoint" => unimplemented!(), // halt miri
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"copy" |
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"copy_nonoverlapping" => {
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let elem_ty = substs.type_at(0);
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let elem_layout = self.layout_of(elem_ty)?;
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let elem_size = elem_layout.size.bytes();
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let count = self.value_to_primval(args[2])?.to_u64()?;
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if count * elem_size != 0 {
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// TODO: We do not even validate alignment for the 0-bytes case. libstd relies on this in vec::IntoIter::next.
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// Also see the write_bytes intrinsic.
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let elem_align = elem_layout.align;
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let src = self.into_ptr(args[0].value)?;
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let src_align = self.layout_of(args[0].ty)?.align;
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let dest = self.into_ptr(args[1].value)?;
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self.memory.copy(
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src,
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src_align,
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dest,
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elem_align,
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count * elem_size,
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intrinsic_name.ends_with("_nonoverlapping"),
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)?;
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}
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}
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"ctpop" | "cttz" | "cttz_nonzero" | "ctlz" | "ctlz_nonzero" | "bswap" => {
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let ty = substs.type_at(0);
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let num = self.value_to_primval(args[0])?.to_bytes()?;
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let kind = self.ty_to_primval_kind(ty)?;
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let num = if intrinsic_name.ends_with("_nonzero") {
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if num == 0 {
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return err!(Intrinsic(format!("{} called on 0", intrinsic_name)));
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}
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numeric_intrinsic(intrinsic_name.trim_right_matches("_nonzero"), num, kind)?
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} else {
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numeric_intrinsic(intrinsic_name, num, kind)?
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};
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self.write_primval(dest, num, ty)?;
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}
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"discriminant_value" => {
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let ty = substs.type_at(0);
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let adt_ptr = self.into_ptr(args[0].value)?;
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let adt_align = self.layout_of(args[0].ty)?.align;
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let place = Place::from_primval_ptr(adt_ptr, adt_align);
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let discr_val = self.read_discriminant_value(place, ty)?;
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self.write_primval(dest, PrimVal::Bytes(discr_val), dest_layout.ty)?;
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}
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"sinf32" | "fabsf32" | "cosf32" | "sqrtf32" | "expf32" | "exp2f32" | "logf32" |
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"log10f32" | "log2f32" | "floorf32" | "ceilf32" | "truncf32" => {
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let f = self.value_to_primval(args[0])?.to_bytes()?;
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let f = f32::from_bits(f as u32);
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let f = match intrinsic_name {
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"sinf32" => f.sin(),
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"fabsf32" => f.abs(),
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"cosf32" => f.cos(),
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"sqrtf32" => f.sqrt(),
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"expf32" => f.exp(),
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"exp2f32" => f.exp2(),
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"logf32" => f.ln(),
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"log10f32" => f.log10(),
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"log2f32" => f.log2(),
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"floorf32" => f.floor(),
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"ceilf32" => f.ceil(),
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"truncf32" => f.trunc(),
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_ => bug!(),
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};
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self.write_primval(dest, PrimVal::Bytes(f.to_bits() as u128), dest_layout.ty)?;
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}
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"sinf64" | "fabsf64" | "cosf64" | "sqrtf64" | "expf64" | "exp2f64" | "logf64" |
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"log10f64" | "log2f64" | "floorf64" | "ceilf64" | "truncf64" => {
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let f = self.value_to_primval(args[0])?.to_bytes()?;
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let f = f64::from_bits(f as u64);
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let f = match intrinsic_name {
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"sinf64" => f.sin(),
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"fabsf64" => f.abs(),
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"cosf64" => f.cos(),
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"sqrtf64" => f.sqrt(),
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"expf64" => f.exp(),
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"exp2f64" => f.exp2(),
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"logf64" => f.ln(),
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"log10f64" => f.log10(),
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"log2f64" => f.log2(),
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"floorf64" => f.floor(),
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"ceilf64" => f.ceil(),
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"truncf64" => f.trunc(),
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_ => bug!(),
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};
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self.write_primval(dest, PrimVal::Bytes(f.to_bits() as u128), dest_layout.ty)?;
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}
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"fadd_fast" | "fsub_fast" | "fmul_fast" | "fdiv_fast" | "frem_fast" => {
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let ty = substs.type_at(0);
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let a = self.value_to_primval(args[0])?;
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let b = self.value_to_primval(args[1])?;
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let op = match intrinsic_name {
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"fadd_fast" => mir::BinOp::Add,
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"fsub_fast" => mir::BinOp::Sub,
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"fmul_fast" => mir::BinOp::Mul,
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"fdiv_fast" => mir::BinOp::Div,
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"frem_fast" => mir::BinOp::Rem,
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_ => bug!(),
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};
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let result = self.binary_op(op, a, ty, b, ty)?;
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self.write_primval(dest, result.0, dest_layout.ty)?;
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}
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"likely" | "unlikely" | "forget" => {}
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"init" => {
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let size = dest_layout.size.bytes();
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let init = |this: &mut Self, val: Value| {
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let zero_val = match val {
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Value::ByRef(ptr, _) => {
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// These writes have no alignment restriction anyway.
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this.memory.write_repeat(ptr, 0, size)?;
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val
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}
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// TODO(solson): Revisit this, it's fishy to check for Undef here.
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Value::ByVal(PrimVal::Undef) => {
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match this.ty_to_primval_kind(dest_layout.ty) {
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Ok(_) => Value::ByVal(PrimVal::Bytes(0)),
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Err(_) => {
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// FIXME(oli-obk): pass TyLayout to alloc_ptr instead of Ty
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let ptr = this.alloc_ptr(dest_layout.ty)?;
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let ptr = Pointer::from(PrimVal::Ptr(ptr));
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this.memory.write_repeat(ptr, 0, size)?;
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Value::ByRef(ptr, dest_layout.align)
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}
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}
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}
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Value::ByVal(_) => Value::ByVal(PrimVal::Bytes(0)),
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Value::ByValPair(..) => {
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Value::ByValPair(PrimVal::Bytes(0), PrimVal::Bytes(0))
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}
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};
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Ok(zero_val)
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};
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match dest {
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Place::Local { frame, local } => self.modify_local(frame, local, init)?,
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Place::Ptr {
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ptr: ptr,
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align: _align,
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extra: PlaceExtra::None,
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} => self.memory.write_repeat(ptr, 0, size)?,
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_ => bug!("TODO"),
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}
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}
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"min_align_of" => {
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let elem_ty = substs.type_at(0);
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let elem_align = self.layout_of(elem_ty)?.align.abi();
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let align_val = PrimVal::from_u128(elem_align as u128);
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self.write_primval(dest, align_val, dest_layout.ty)?;
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}
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"pref_align_of" => {
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let ty = substs.type_at(0);
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let layout = self.layout_of(ty)?;
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let align = layout.align.pref();
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let align_val = PrimVal::from_u128(align as u128);
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self.write_primval(dest, align_val, dest_layout.ty)?;
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}
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"move_val_init" => {
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let ty = substs.type_at(0);
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let ptr = self.into_ptr(args[0].value)?;
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let align = self.layout_of(args[0].ty)?.align;
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self.write_value_to_ptr(args[1].value, ptr, align, ty)?;
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}
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"needs_drop" => {
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let ty = substs.type_at(0);
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let env = ty::ParamEnv::empty(Reveal::All);
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let needs_drop = ty.needs_drop(self.tcx, env);
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self.write_primval(
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dest,
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PrimVal::from_bool(needs_drop),
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dest_layout.ty,
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)?;
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}
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"offset" => {
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let offset = self.value_to_primval(args[1])?.to_i128()? as i64;
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let ptr = self.into_ptr(args[0].value)?;
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let result_ptr = self.pointer_offset(ptr, substs.type_at(0), offset)?;
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self.write_ptr(dest, result_ptr, dest_layout.ty)?;
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}
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"overflowing_sub" => {
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self.intrinsic_overflowing(
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mir::BinOp::Sub,
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args[0],
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args[1],
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dest,
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dest_layout.ty,
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)?;
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}
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"overflowing_mul" => {
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self.intrinsic_overflowing(
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mir::BinOp::Mul,
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args[0],
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args[1],
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dest,
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dest_layout.ty,
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)?;
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}
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"overflowing_add" => {
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self.intrinsic_overflowing(
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mir::BinOp::Add,
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args[0],
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args[1],
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dest,
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dest_layout.ty,
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)?;
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}
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"powf32" => {
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let f = self.value_to_primval(args[0])?.to_bytes()?;
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let f = f32::from_bits(f as u32);
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let f2 = self.value_to_primval(args[1])?.to_bytes()?;
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let f2 = f32::from_bits(f2 as u32);
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self.write_primval(
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dest,
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PrimVal::Bytes(f.powf(f2).to_bits() as u128),
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dest_layout.ty,
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)?;
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}
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"powf64" => {
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let f = self.value_to_primval(args[0])?.to_bytes()?;
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let f = f64::from_bits(f as u64);
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let f2 = self.value_to_primval(args[1])?.to_bytes()?;
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let f2 = f64::from_bits(f2 as u64);
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self.write_primval(
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dest,
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PrimVal::Bytes(f.powf(f2).to_bits() as u128),
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dest_layout.ty,
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)?;
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}
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"fmaf32" => {
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let a = self.value_to_primval(args[0])?.to_bytes()?;
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let a = f32::from_bits(a as u32);
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let b = self.value_to_primval(args[1])?.to_bytes()?;
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let b = f32::from_bits(b as u32);
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let c = self.value_to_primval(args[2])?.to_bytes()?;
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let c = f32::from_bits(c as u32);
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self.write_primval(
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|
dest,
|
|
PrimVal::Bytes((a * b + c).to_bits() as u128),
|
|
dest_layout.ty,
|
|
)?;
|
|
}
|
|
|
|
"fmaf64" => {
|
|
let a = self.value_to_primval(args[0])?.to_bytes()?;
|
|
let a = f64::from_bits(a as u64);
|
|
let b = self.value_to_primval(args[1])?.to_bytes()?;
|
|
let b = f64::from_bits(b as u64);
|
|
let c = self.value_to_primval(args[2])?.to_bytes()?;
|
|
let c = f64::from_bits(c as u64);
|
|
self.write_primval(
|
|
dest,
|
|
PrimVal::Bytes((a * b + c).to_bits() as u128),
|
|
dest_layout.ty,
|
|
)?;
|
|
}
|
|
|
|
"powif32" => {
|
|
let f = self.value_to_primval(args[0])?.to_bytes()?;
|
|
let f = f32::from_bits(f as u32);
|
|
let i = self.value_to_primval(args[1])?.to_i128()?;
|
|
self.write_primval(
|
|
dest,
|
|
PrimVal::Bytes(f.powi(i as i32).to_bits() as u128),
|
|
dest_layout.ty,
|
|
)?;
|
|
}
|
|
|
|
"powif64" => {
|
|
let f = self.value_to_primval(args[0])?.to_bytes()?;
|
|
let f = f64::from_bits(f as u64);
|
|
let i = self.value_to_primval(args[1])?.to_i128()?;
|
|
self.write_primval(
|
|
dest,
|
|
PrimVal::Bytes(f.powi(i as i32).to_bits() as u128),
|
|
dest_layout.ty,
|
|
)?;
|
|
}
|
|
|
|
"size_of" => {
|
|
let ty = substs.type_at(0);
|
|
let size = self.layout_of(ty)?.size.bytes().into();
|
|
self.write_primval(dest, PrimVal::from_u128(size), dest_layout.ty)?;
|
|
}
|
|
|
|
"size_of_val" => {
|
|
let ty = substs.type_at(0);
|
|
let (size, _) = self.size_and_align_of_dst(ty, args[0].value)?;
|
|
self.write_primval(
|
|
dest,
|
|
PrimVal::from_u128(size.bytes() as u128),
|
|
dest_layout.ty,
|
|
)?;
|
|
}
|
|
|
|
"min_align_of_val" |
|
|
"align_of_val" => {
|
|
let ty = substs.type_at(0);
|
|
let (_, align) = self.size_and_align_of_dst(ty, args[0].value)?;
|
|
self.write_primval(
|
|
dest,
|
|
PrimVal::from_u128(align.abi() as u128),
|
|
dest_layout.ty,
|
|
)?;
|
|
}
|
|
|
|
"type_name" => {
|
|
let ty = substs.type_at(0);
|
|
let ty_name = ty.to_string();
|
|
let value = self.str_to_value(&ty_name)?;
|
|
self.write_value(ValTy { value, ty: dest_layout.ty }, dest)?;
|
|
}
|
|
"type_id" => {
|
|
let ty = substs.type_at(0);
|
|
let n = self.tcx.type_id_hash(ty);
|
|
self.write_primval(dest, PrimVal::Bytes(n as u128), dest_layout.ty)?;
|
|
}
|
|
|
|
"transmute" => {
|
|
let src_ty = substs.type_at(0);
|
|
let src_align = self.layout_of(src_ty)?.align;
|
|
let ptr = self.force_allocation(dest)?.to_ptr()?;
|
|
let dest_align = self.layout_of(substs.type_at(1))?.align;
|
|
self.write_value_to_ptr(args[0].value, ptr.into(), dest_align, src_ty);
|
|
}
|
|
|
|
"unchecked_shl" => {
|
|
let bits = dest_layout.size.bytes() as u128 * 8;
|
|
let rhs = self.value_to_primval(args[1])?
|
|
.to_bytes()?;
|
|
if rhs >= bits {
|
|
return err!(Intrinsic(
|
|
format!("Overflowing shift by {} in unchecked_shl", rhs),
|
|
));
|
|
}
|
|
self.intrinsic_overflowing(
|
|
mir::BinOp::Shl,
|
|
args[0],
|
|
args[1],
|
|
dest,
|
|
dest_layout.ty,
|
|
)?;
|
|
}
|
|
|
|
"unchecked_shr" => {
|
|
let bits = dest_layout.size.bytes() as u128 * 8;
|
|
let rhs = self.value_to_primval(args[1])?
|
|
.to_bytes()?;
|
|
if rhs >= bits {
|
|
return err!(Intrinsic(
|
|
format!("Overflowing shift by {} in unchecked_shr", rhs),
|
|
));
|
|
}
|
|
self.intrinsic_overflowing(
|
|
mir::BinOp::Shr,
|
|
args[0],
|
|
args[1],
|
|
dest,
|
|
dest_layout.ty,
|
|
)?;
|
|
}
|
|
|
|
"unchecked_div" => {
|
|
let rhs = self.value_to_primval(args[1])?
|
|
.to_bytes()?;
|
|
if rhs == 0 {
|
|
return err!(Intrinsic(format!("Division by 0 in unchecked_div")));
|
|
}
|
|
self.intrinsic_overflowing(
|
|
mir::BinOp::Div,
|
|
args[0],
|
|
args[1],
|
|
dest,
|
|
dest_layout.ty,
|
|
)?;
|
|
}
|
|
|
|
"unchecked_rem" => {
|
|
let rhs = self.value_to_primval(args[1])?
|
|
.to_bytes()?;
|
|
if rhs == 0 {
|
|
return err!(Intrinsic(format!("Division by 0 in unchecked_rem")));
|
|
}
|
|
self.intrinsic_overflowing(
|
|
mir::BinOp::Rem,
|
|
args[0],
|
|
args[1],
|
|
dest,
|
|
dest_layout.ty,
|
|
)?;
|
|
}
|
|
|
|
"uninit" => {
|
|
let size = dest_layout.size.bytes();
|
|
let uninit = |this: &mut Self, val: Value| match val {
|
|
Value::ByRef(ptr, _) => {
|
|
this.memory.mark_definedness(ptr, size, false)?;
|
|
Ok(val)
|
|
}
|
|
_ => Ok(Value::ByVal(PrimVal::Undef)),
|
|
};
|
|
match dest {
|
|
Place::Local { frame, local } => self.modify_local(frame, local, uninit)?,
|
|
Place::Ptr {
|
|
ptr: ptr,
|
|
align: _align,
|
|
extra: PlaceExtra::None,
|
|
} => self.memory.mark_definedness(ptr, size, false)?,
|
|
_ => bug!("todo"),
|
|
}
|
|
}
|
|
|
|
"write_bytes" => {
|
|
let ty = substs.type_at(0);
|
|
let ty_layout = self.layout_of(ty)?;
|
|
let val_byte = self.value_to_primval(args[1])?.to_u128()? as u8;
|
|
let ptr = self.into_ptr(args[0].value)?;
|
|
let count = self.value_to_primval(args[2])?.to_u64()?;
|
|
if count > 0 {
|
|
// HashMap relies on write_bytes on a NULL ptr with count == 0 to work
|
|
// TODO: Should we, at least, validate the alignment? (Also see the copy intrinsic)
|
|
self.memory.check_align(ptr, ty_layout.align)?;
|
|
self.memory.write_repeat(ptr, val_byte, ty_layout.size.bytes() * count)?;
|
|
}
|
|
}
|
|
|
|
name => return err!(Unimplemented(format!("unimplemented intrinsic: {}", name))),
|
|
}
|
|
|
|
self.goto_block(target);
|
|
|
|
// Since we pushed no stack frame, the main loop will act
|
|
// as if the call just completed and it's returning to the
|
|
// current frame.
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
fn numeric_intrinsic<'tcx>(
|
|
name: &str,
|
|
bytes: u128,
|
|
kind: PrimValKind,
|
|
) -> EvalResult<'tcx, PrimVal> {
|
|
macro_rules! integer_intrinsic {
|
|
($method:ident) => ({
|
|
use rustc::mir::interpret::PrimValKind::*;
|
|
let result_bytes = match kind {
|
|
I8 => (bytes as i8).$method() as u128,
|
|
U8 => (bytes as u8).$method() as u128,
|
|
I16 => (bytes as i16).$method() as u128,
|
|
U16 => (bytes as u16).$method() as u128,
|
|
I32 => (bytes as i32).$method() as u128,
|
|
U32 => (bytes as u32).$method() as u128,
|
|
I64 => (bytes as i64).$method() as u128,
|
|
U64 => (bytes as u64).$method() as u128,
|
|
I128 => (bytes as i128).$method() as u128,
|
|
U128 => bytes.$method() as u128,
|
|
_ => bug!("invalid `{}` argument: {:?}", name, bytes),
|
|
};
|
|
|
|
PrimVal::Bytes(result_bytes)
|
|
});
|
|
}
|
|
|
|
let result_val = match name {
|
|
"bswap" => integer_intrinsic!(swap_bytes),
|
|
"ctlz" => integer_intrinsic!(leading_zeros),
|
|
"ctpop" => integer_intrinsic!(count_ones),
|
|
"cttz" => integer_intrinsic!(trailing_zeros),
|
|
_ => bug!("not a numeric intrinsic: {}", name),
|
|
};
|
|
|
|
Ok(result_val)
|
|
}
|