2016-11-03 04:38:08 -05:00
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use rustc::mir;
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2017-02-09 04:15:56 -06:00
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use rustc::ty::layout::{Layout, Size, Align};
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2016-09-20 09:05:30 -05:00
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use rustc::ty::subst::Substs;
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2016-09-26 10:49:30 -05:00
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use rustc::ty::{self, Ty};
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2016-09-20 09:05:30 -05:00
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use error::{EvalError, EvalResult};
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2016-12-07 22:58:48 -06:00
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use eval_context::EvalContext;
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use lvalue::{Lvalue, LvalueExtra};
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2016-12-10 18:23:07 -06:00
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use operator;
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use value::{PrimVal, PrimValKind, Value};
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2016-09-20 09:05:30 -05:00
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impl<'a, 'tcx> EvalContext<'a, 'tcx> {
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pub(super) fn call_intrinsic(
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&mut self,
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instance: ty::Instance<'tcx>,
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args: &[mir::Operand<'tcx>],
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dest: Lvalue<'tcx>,
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dest_ty: Ty<'tcx>,
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dest_layout: &'tcx Layout,
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2016-11-04 11:51:13 -05:00
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target: mir::BasicBlock,
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2017-02-04 15:09:10 -06:00
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) -> EvalResult<'tcx> {
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2016-10-21 04:17:53 -05:00
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let arg_vals: EvalResult<Vec<Value>> = args.iter()
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2016-09-23 03:27:14 -05:00
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.map(|arg| self.eval_operand(arg))
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2016-09-20 09:05:30 -05:00
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.collect();
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2016-10-21 04:17:53 -05:00
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let arg_vals = arg_vals?;
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2016-09-23 03:27:14 -05:00
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let i32 = self.tcx.types.i32;
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let isize = self.tcx.types.isize;
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let usize = self.tcx.types.usize;
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let f32 = self.tcx.types.f32;
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let f64 = self.tcx.types.f64;
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let substs = instance.substs;
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2017-03-21 07:53:55 -05:00
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let intrinsic_name = &self.tcx.item_name(instance.def_id()).as_str()[..];
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2016-09-29 09:42:01 -05:00
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match intrinsic_name {
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2016-10-16 18:18:06 -05:00
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"add_with_overflow" =>
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self.intrinsic_with_overflow(mir::BinOp::Add, &args[0], &args[1], dest, dest_ty)?,
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2016-10-14 04:31:45 -05:00
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2016-10-16 18:18:06 -05:00
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"sub_with_overflow" =>
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self.intrinsic_with_overflow(mir::BinOp::Sub, &args[0], &args[1], dest, dest_ty)?,
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"mul_with_overflow" =>
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self.intrinsic_with_overflow(mir::BinOp::Mul, &args[0], &args[1], dest, dest_ty)?,
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2016-09-20 09:05:30 -05:00
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"arith_offset" => {
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let ptr = arg_vals[0].read_ptr(&self.memory)?;
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2017-01-12 01:28:42 -06:00
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let offset = self.value_to_primval(arg_vals[1], isize)?.to_i128()?;
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let new_ptr = ptr.signed_offset(offset as i64);
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2016-12-16 01:55:00 -06:00
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self.write_primval(dest, PrimVal::Ptr(new_ptr), dest_ty)?;
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}
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"assume" => {
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let bool = self.tcx.types.bool;
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2016-12-17 00:01:01 -06:00
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let cond = self.value_to_primval(arg_vals[0], bool)?.to_bool()?;
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2016-10-14 04:52:23 -05:00
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if !cond { return Err(EvalError::AssumptionNotHeld); }
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}
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2016-10-14 04:49:02 -05:00
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"atomic_load" |
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2016-12-16 19:10:16 -06:00
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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 ty = substs.type_at(0);
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let ptr = arg_vals[0].read_ptr(&self.memory)?;
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2016-10-14 04:49:02 -05:00
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self.write_value(Value::ByRef(ptr), dest, ty)?;
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}
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"atomic_store" |
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2016-12-15 11:27:47 -06:00
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"atomic_store_relaxed" |
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"atomic_store_rel" |
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2016-10-14 04:49:02 -05:00
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"volatile_store" => {
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let ty = substs.type_at(0);
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let dest = arg_vals[0].read_ptr(&self.memory)?;
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self.write_value_to_ptr(arg_vals[1], dest, ty)?;
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2016-10-14 04:49:02 -05:00
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}
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2016-11-03 11:32:06 -05:00
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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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2017-03-14 07:05:51 -05:00
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_ if intrinsic_name.starts_with("atomic_xchg") => {
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2017-03-29 02:10:05 -05:00
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let ty = substs.type_at(0);
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2016-11-15 08:19:38 -06:00
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let ptr = arg_vals[0].read_ptr(&self.memory)?;
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let change = self.value_to_primval(arg_vals[1], ty)?;
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let old = self.read_value(ptr, 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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2016-11-27 00:58:01 -06:00
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self.write_primval(dest, old, ty)?;
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self.write_primval(Lvalue::from_ptr(ptr), change, ty)?;
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2016-11-15 08:19:38 -06:00
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}
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2017-03-14 07:05:51 -05:00
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_ if intrinsic_name.starts_with("atomic_cxchg") => {
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2017-03-29 02:10:05 -05:00
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let ty = substs.type_at(0);
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2016-11-15 08:19:38 -06:00
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let ptr = arg_vals[0].read_ptr(&self.memory)?;
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let expect_old = self.value_to_primval(arg_vals[1], ty)?;
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let change = self.value_to_primval(arg_vals[2], ty)?;
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let old = self.read_value(ptr, 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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2016-11-27 00:58:01 -06:00
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let kind = self.ty_to_primval_kind(ty)?;
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let (val, _) = operator::binary_op(mir::BinOp::Eq, old, kind, expect_old, kind)?;
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2016-11-15 08:19:38 -06:00
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let dest = self.force_allocation(dest)?.to_ptr();
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self.write_pair_to_ptr(old, val, dest, dest_ty)?;
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2016-11-27 00:58:01 -06:00
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self.write_primval(Lvalue::from_ptr(ptr), change, ty)?;
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2016-11-15 08:19:38 -06:00
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}
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2017-03-14 07:05:51 -05:00
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"atomic_or" | "atomic_or_acq" | "atomic_or_rel" | "atomic_or_acqrel" | "atomic_or_relaxed" |
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"atomic_xor" | "atomic_xor_acq" | "atomic_xor_rel" | "atomic_xor_acqrel" | "atomic_xor_relaxed" |
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"atomic_and" | "atomic_and_acq" | "atomic_and_rel" | "atomic_and_acqrel" | "atomic_and_relaxed" |
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"atomic_xadd" | "atomic_xadd_acq" | "atomic_xadd_rel" | "atomic_xadd_acqrel" | "atomic_xadd_relaxed" |
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"atomic_xsub" | "atomic_xsub_acq" | "atomic_xsub_rel" | "atomic_xsub_acqrel" | "atomic_xsub_relaxed" => {
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2017-03-29 02:10:05 -05:00
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let ty = substs.type_at(0);
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2016-11-15 08:19:38 -06:00
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let ptr = arg_vals[0].read_ptr(&self.memory)?;
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let change = self.value_to_primval(arg_vals[1], ty)?;
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let old = self.read_value(ptr, 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_xadd_relaxed doesn't work with nonprimitives"),
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};
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2016-11-27 00:58:01 -06:00
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self.write_primval(dest, old, ty)?;
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let kind = self.ty_to_primval_kind(ty)?;
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2017-03-14 07:05:51 -05:00
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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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2016-11-03 11:32:06 -05:00
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};
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// FIXME: what do atomics do on overflow?
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2017-03-14 07:05:51 -05:00
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let (val, _) = operator::binary_op(op, old, kind, change, kind)?;
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2016-11-27 00:58:01 -06:00
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self.write_primval(Lvalue::from_ptr(ptr), val, ty)?;
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},
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2016-11-03 11:32:06 -05:00
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2016-09-20 09:05:30 -05:00
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"breakpoint" => unimplemented!(), // halt miri
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"copy" |
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"copy_nonoverlapping" => {
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// FIXME: check whether overlapping occurs
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2017-03-29 02:10:05 -05:00
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let elem_ty = substs.type_at(0);
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2016-11-17 10:23:40 -06:00
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let elem_size = self.type_size(elem_ty)?.expect("cannot copy unsized value");
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let elem_align = self.type_align(elem_ty)?;
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2016-10-21 04:17:53 -05:00
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let src = arg_vals[0].read_ptr(&self.memory)?;
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let dest = arg_vals[1].read_ptr(&self.memory)?;
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2016-12-17 00:01:01 -06:00
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let count = self.value_to_primval(arg_vals[2], usize)?.to_u64()?;
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2016-11-18 05:55:14 -06:00
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self.memory.copy(src, dest, count * elem_size, elem_align)?;
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2016-09-20 09:05:30 -05:00
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}
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2016-09-29 09:42:01 -05:00
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"ctpop" |
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"cttz" |
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"ctlz" |
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2016-09-29 08:58:26 -05:00
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"bswap" => {
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2017-03-29 02:10:05 -05:00
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let ty = substs.type_at(0);
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2016-11-27 00:58:01 -06:00
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let num = self.value_to_primval(arg_vals[0], ty)?;
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let kind = self.ty_to_primval_kind(ty)?;
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2016-12-17 05:09:57 -06:00
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let num = numeric_intrinsic(intrinsic_name, num, kind)?;
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2016-11-27 00:58:01 -06:00
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self.write_primval(dest, num, ty)?;
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2016-09-20 09:05:30 -05:00
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}
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"discriminant_value" => {
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2017-03-29 02:10:05 -05:00
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let ty = substs.type_at(0);
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2016-10-21 04:17:53 -05:00
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let adt_ptr = arg_vals[0].read_ptr(&self.memory)?;
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2016-09-20 09:05:30 -05:00
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let discr_val = self.read_discriminant_value(adt_ptr, ty)?;
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2016-12-16 01:40:45 -06:00
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self.write_primval(dest, PrimVal::Bytes(discr_val), dest_ty)?;
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2016-09-20 09:05:30 -05:00
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}
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2017-03-14 06:35:38 -05:00
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"sinf32" | "fabsf32" | "cosf32" |
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"sqrtf32" | "expf32" | "exp2f32" |
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"logf32" | "log10f32" | "log2f32" |
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"floorf32" | "ceilf32" | "truncf32" => {
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2017-02-10 16:53:56 -06:00
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let f = self.value_to_primval(arg_vals[0], f32)?.to_f32()?;
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2017-03-14 06:35:38 -05:00
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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::from_f32(f), dest_ty)?;
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2016-09-20 09:05:30 -05:00
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}
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2017-03-14 06:35:38 -05:00
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"sinf64" | "fabsf64" | "cosf64" |
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"sqrtf64" | "expf64" | "exp2f64" |
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"logf64" | "log10f64" | "log2f64" |
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"floorf64" | "ceilf64" | "truncf64" => {
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2017-02-10 16:53:56 -06:00
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let f = self.value_to_primval(arg_vals[0], f64)?.to_f64()?;
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2017-03-14 06:35:38 -05:00
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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::from_f64(f), dest_ty)?;
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2016-09-20 09:05:30 -05:00
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}
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2017-02-10 07:58:34 -06:00
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"fadd_fast" | "fsub_fast" | "fmul_fast" | "fdiv_fast" | "frem_fast" => {
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2017-03-29 02:10:05 -05:00
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let ty = substs.type_at(0);
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2016-11-27 00:58:01 -06:00
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let kind = self.ty_to_primval_kind(ty)?;
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2016-10-21 04:17:53 -05:00
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let a = self.value_to_primval(arg_vals[0], ty)?;
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2017-02-10 07:58:34 -06:00
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let b = self.value_to_primval(arg_vals[1], ty)?;
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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 = operator::binary_op(op, a, kind, b, kind)?;
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2016-11-27 00:58:01 -06:00
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self.write_primval(dest, result.0, dest_ty)?;
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2016-09-20 09:05:30 -05:00
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}
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"likely" |
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"unlikely" |
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"forget" => {}
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2016-10-14 04:31:45 -05:00
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"init" => {
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2016-12-18 22:59:01 -06:00
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let size = self.type_size(dest_ty)?.expect("cannot zero unsized value");
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let init = |this: &mut Self, val: Value| {
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2016-11-27 00:58:01 -06:00
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let zero_val = match val {
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2016-12-18 22:59:01 -06:00
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Value::ByRef(ptr) => {
|
2016-11-03 06:52:13 -05:00
|
|
|
this.memory.write_repeat(ptr, 0, size)?;
|
2016-11-27 00:58:01 -06:00
|
|
|
Value::ByRef(ptr)
|
2016-11-03 06:52:13 -05:00
|
|
|
},
|
2016-12-18 22:59:01 -06:00
|
|
|
// TODO(solson): Revisit this, it's fishy to check for Undef here.
|
|
|
|
Value::ByVal(PrimVal::Undef) => match this.ty_to_primval_kind(dest_ty) {
|
2016-12-16 01:40:45 -06:00
|
|
|
Ok(_) => Value::ByVal(PrimVal::Bytes(0)),
|
2016-11-03 06:52:13 -05:00
|
|
|
Err(_) => {
|
2017-03-29 02:10:05 -05:00
|
|
|
let ptr = this.alloc_ptr_with_substs(dest_ty, substs)?;
|
2016-11-03 06:52:13 -05:00
|
|
|
this.memory.write_repeat(ptr, 0, size)?;
|
2016-11-27 00:58:01 -06:00
|
|
|
Value::ByRef(ptr)
|
2016-11-03 06:52:13 -05:00
|
|
|
}
|
|
|
|
},
|
2016-12-18 22:59:01 -06:00
|
|
|
Value::ByVal(_) => Value::ByVal(PrimVal::Bytes(0)),
|
|
|
|
Value::ByValPair(..) =>
|
2016-12-16 01:40:45 -06:00
|
|
|
Value::ByValPair(PrimVal::Bytes(0), PrimVal::Bytes(0)),
|
2016-11-27 00:58:01 -06:00
|
|
|
};
|
2016-12-18 22:59:01 -06:00
|
|
|
Ok(zero_val)
|
2016-11-03 06:52:13 -05:00
|
|
|
};
|
|
|
|
match dest {
|
2017-02-10 09:14:59 -06:00
|
|
|
Lvalue::Local { frame, local, field } => self.modify_local(frame, local, field.map(|(i, _)| i), init)?,
|
2016-11-03 06:31:04 -05:00
|
|
|
Lvalue::Ptr { ptr, extra: LvalueExtra::None } => self.memory.write_repeat(ptr, 0, size)?,
|
|
|
|
Lvalue::Ptr { .. } => bug!("init intrinsic tried to write to fat ptr target"),
|
2016-11-03 06:52:13 -05:00
|
|
|
Lvalue::Global(cid) => self.modify_global(cid, init)?,
|
2016-11-03 06:31:04 -05:00
|
|
|
}
|
2016-10-14 04:31:45 -05:00
|
|
|
}
|
2016-09-20 09:05:30 -05:00
|
|
|
|
|
|
|
"min_align_of" => {
|
2017-03-29 02:10:05 -05:00
|
|
|
let elem_ty = substs.type_at(0);
|
2016-11-17 10:23:40 -06:00
|
|
|
let elem_align = self.type_align(elem_ty)?;
|
2017-01-12 01:28:42 -06:00
|
|
|
let align_val = PrimVal::from_u128(elem_align as u128);
|
2016-11-27 00:58:01 -06:00
|
|
|
self.write_primval(dest, align_val, dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
"pref_align_of" => {
|
2017-03-29 02:10:05 -05:00
|
|
|
let ty = substs.type_at(0);
|
2016-11-17 10:23:40 -06:00
|
|
|
let layout = self.type_layout(ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
let align = layout.align(&self.tcx.data_layout).pref();
|
2017-01-12 01:28:42 -06:00
|
|
|
let align_val = PrimVal::from_u128(align as u128);
|
2016-11-27 00:58:01 -06:00
|
|
|
self.write_primval(dest, align_val, dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
"move_val_init" => {
|
2017-03-29 02:10:05 -05:00
|
|
|
let ty = substs.type_at(0);
|
2016-10-21 04:17:53 -05:00
|
|
|
let ptr = arg_vals[0].read_ptr(&self.memory)?;
|
|
|
|
self.write_value_to_ptr(arg_vals[1], ptr, ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
"needs_drop" => {
|
2017-03-29 02:10:05 -05:00
|
|
|
let ty = substs.type_at(0);
|
2016-10-14 04:31:45 -05:00
|
|
|
let env = self.tcx.empty_parameter_environment();
|
|
|
|
let needs_drop = self.tcx.type_needs_drop_given_env(ty, &env);
|
2016-11-27 00:58:01 -06:00
|
|
|
self.write_primval(dest, PrimVal::from_bool(needs_drop), dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
"offset" => {
|
2017-03-29 02:10:05 -05:00
|
|
|
let pointee_ty = substs.type_at(0);
|
2016-11-18 05:55:14 -06:00
|
|
|
// FIXME: assuming here that type size is < i64::max_value()
|
|
|
|
let pointee_size = self.type_size(pointee_ty)?.expect("cannot offset a pointer to an unsized type") as i64;
|
2017-01-12 01:28:42 -06:00
|
|
|
let offset = self.value_to_primval(arg_vals[1], isize)?.to_i128()? as i64;
|
2016-09-20 09:05:30 -05:00
|
|
|
|
2016-10-21 04:17:53 -05:00
|
|
|
let ptr = arg_vals[0].read_ptr(&self.memory)?;
|
2016-11-18 05:55:14 -06:00
|
|
|
let result_ptr = ptr.signed_offset(offset * pointee_size);
|
2016-12-16 01:55:00 -06:00
|
|
|
self.write_primval(dest, PrimVal::Ptr(result_ptr), dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
"overflowing_sub" => {
|
2016-11-27 00:58:01 -06:00
|
|
|
self.intrinsic_overflowing(mir::BinOp::Sub, &args[0], &args[1], dest, dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
"overflowing_mul" => {
|
2016-11-27 00:58:01 -06:00
|
|
|
self.intrinsic_overflowing(mir::BinOp::Mul, &args[0], &args[1], dest, dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
"overflowing_add" => {
|
2016-11-27 00:58:01 -06:00
|
|
|
self.intrinsic_overflowing(mir::BinOp::Add, &args[0], &args[1], dest, dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
2017-03-14 06:35:38 -05:00
|
|
|
"powf32" => {
|
2016-12-17 00:01:01 -06:00
|
|
|
let f = self.value_to_primval(arg_vals[0], f32)?.to_f32()?;
|
2017-03-14 06:35:38 -05:00
|
|
|
let f2 = self.value_to_primval(arg_vals[1], f32)?.to_f32()?;
|
|
|
|
self.write_primval(dest, PrimVal::from_f32(f.powf(f2)), dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
2017-03-14 06:35:38 -05:00
|
|
|
"powf64" => {
|
2016-12-17 00:01:01 -06:00
|
|
|
let f = self.value_to_primval(arg_vals[0], f64)?.to_f64()?;
|
2017-03-14 06:35:38 -05:00
|
|
|
let f2 = self.value_to_primval(arg_vals[1], f64)?.to_f64()?;
|
|
|
|
self.write_primval(dest, PrimVal::from_f64(f.powf(f2)), dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
2017-03-14 06:35:38 -05:00
|
|
|
"fmaf32" => {
|
|
|
|
let a = self.value_to_primval(arg_vals[0], f32)?.to_f32()?;
|
|
|
|
let b = self.value_to_primval(arg_vals[1], f32)?.to_f32()?;
|
|
|
|
let c = self.value_to_primval(arg_vals[2], f32)?.to_f32()?;
|
|
|
|
self.write_primval(dest, PrimVal::from_f32(a * b + c), dest_ty)?;
|
|
|
|
}
|
|
|
|
|
|
|
|
"fmaf64" => {
|
|
|
|
let a = self.value_to_primval(arg_vals[0], f64)?.to_f64()?;
|
|
|
|
let b = self.value_to_primval(arg_vals[1], f64)?.to_f64()?;
|
|
|
|
let c = self.value_to_primval(arg_vals[2], f64)?.to_f64()?;
|
|
|
|
self.write_primval(dest, PrimVal::from_f64(a * b + c), dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
2017-03-14 06:35:38 -05:00
|
|
|
"powif32" => {
|
2016-12-17 00:01:01 -06:00
|
|
|
let f = self.value_to_primval(arg_vals[0], f32)?.to_f32()?;
|
2017-03-14 06:35:38 -05:00
|
|
|
let i = self.value_to_primval(arg_vals[1], i32)?.to_i128()?;
|
|
|
|
self.write_primval(dest, PrimVal::from_f32(f.powi(i as i32)), dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
2017-03-14 06:35:38 -05:00
|
|
|
"powif64" => {
|
2016-12-17 00:01:01 -06:00
|
|
|
let f = self.value_to_primval(arg_vals[0], f64)?.to_f64()?;
|
2017-03-14 06:35:38 -05:00
|
|
|
let i = self.value_to_primval(arg_vals[1], i32)?.to_i128()?;
|
|
|
|
self.write_primval(dest, PrimVal::from_f64(f.powi(i as i32)), dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
"size_of" => {
|
2017-03-29 02:10:05 -05:00
|
|
|
let ty = substs.type_at(0);
|
2016-11-11 06:07:41 -06:00
|
|
|
// FIXME: change the `box_free` lang item to take `T: ?Sized` and have it use the
|
|
|
|
// `size_of_val` intrinsic, then change this back to
|
|
|
|
// .expect("size_of intrinsic called on unsized value")
|
|
|
|
// see https://github.com/rust-lang/rust/pull/37708
|
2017-01-12 01:28:42 -06:00
|
|
|
let size = self.type_size(ty)?.unwrap_or(!0) as u128;
|
|
|
|
self.write_primval(dest, PrimVal::from_u128(size), dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
"size_of_val" => {
|
2017-03-29 02:10:05 -05:00
|
|
|
let ty = substs.type_at(0);
|
2016-10-21 04:17:53 -05:00
|
|
|
let (size, _) = self.size_and_align_of_dst(ty, arg_vals[0])?;
|
2017-01-12 01:28:42 -06:00
|
|
|
self.write_primval(dest, PrimVal::from_u128(size as u128), dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
2016-11-03 11:32:06 -05:00
|
|
|
|
|
|
|
"min_align_of_val" |
|
|
|
|
"align_of_val" => {
|
2017-03-29 02:10:05 -05:00
|
|
|
let ty = substs.type_at(0);
|
2016-11-03 11:32:06 -05:00
|
|
|
let (_, align) = self.size_and_align_of_dst(ty, arg_vals[0])?;
|
2017-01-12 01:28:42 -06:00
|
|
|
self.write_primval(dest, PrimVal::from_u128(align as u128), dest_ty)?;
|
2016-11-03 11:32:06 -05:00
|
|
|
}
|
|
|
|
|
2016-09-20 09:05:30 -05:00
|
|
|
"type_name" => {
|
2017-03-29 02:10:05 -05:00
|
|
|
let ty = substs.type_at(0);
|
2016-09-20 09:05:30 -05:00
|
|
|
let ty_name = ty.to_string();
|
2016-09-26 10:49:30 -05:00
|
|
|
let s = self.str_to_value(&ty_name)?;
|
|
|
|
self.write_value(s, dest, dest_ty)?;
|
2016-09-23 03:38:30 -05:00
|
|
|
}
|
2016-09-20 09:05:30 -05:00
|
|
|
"type_id" => {
|
2017-03-29 02:10:05 -05:00
|
|
|
let ty = substs.type_at(0);
|
2016-09-20 09:05:30 -05:00
|
|
|
let n = self.tcx.type_id_hash(ty);
|
2017-01-12 01:28:42 -06:00
|
|
|
self.write_primval(dest, PrimVal::Bytes(n as u128), dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
"transmute" => {
|
2017-03-29 02:10:05 -05:00
|
|
|
let dest_ty = substs.type_at(1);
|
2016-11-27 00:58:01 -06:00
|
|
|
self.write_value(arg_vals[0], dest, dest_ty)?;
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
|
|
|
|
2016-10-14 04:31:45 -05:00
|
|
|
"uninit" => {
|
2016-11-18 05:55:14 -06:00
|
|
|
let size = dest_layout.size(&self.tcx.data_layout).bytes();
|
2016-12-18 22:59:01 -06:00
|
|
|
let uninit = |this: &mut Self, val: Value| {
|
2016-11-03 07:13:47 -05:00
|
|
|
match val {
|
2016-12-18 22:59:01 -06:00
|
|
|
Value::ByRef(ptr) => {
|
2016-11-03 07:13:47 -05:00
|
|
|
this.memory.mark_definedness(ptr, size, false)?;
|
2016-12-18 22:59:01 -06:00
|
|
|
Ok(Value::ByRef(ptr))
|
2016-11-03 07:13:47 -05:00
|
|
|
},
|
2016-12-18 22:59:01 -06:00
|
|
|
_ => Ok(Value::ByVal(PrimVal::Undef)),
|
2016-11-03 07:13:47 -05:00
|
|
|
}
|
|
|
|
};
|
|
|
|
match dest {
|
2017-02-10 09:14:59 -06:00
|
|
|
Lvalue::Local { frame, local, field } => self.modify_local(frame, local, field.map(|(i, _)| i), uninit)?,
|
2016-12-18 22:59:01 -06:00
|
|
|
Lvalue::Ptr { ptr, extra: LvalueExtra::None } =>
|
|
|
|
self.memory.mark_definedness(ptr, size, false)?,
|
2016-11-03 07:13:47 -05:00
|
|
|
Lvalue::Ptr { .. } => bug!("uninit intrinsic tried to write to fat ptr target"),
|
|
|
|
Lvalue::Global(cid) => self.modify_global(cid, uninit)?,
|
|
|
|
}
|
2016-10-14 04:31:45 -05:00
|
|
|
}
|
2016-09-20 09:05:30 -05:00
|
|
|
|
2017-03-13 18:28:29 -05:00
|
|
|
"write_bytes" => {
|
|
|
|
let u8 = self.tcx.types.u8;
|
2017-03-29 02:10:05 -05:00
|
|
|
let ty = substs.type_at(0);
|
2017-03-13 19:47:08 -05:00
|
|
|
let ty_align = self.type_align(ty)?;
|
|
|
|
let val_byte = self.value_to_primval(arg_vals[1], u8)?.to_u128()? as u8;
|
2017-03-13 18:28:29 -05:00
|
|
|
let size = self.type_size(ty)?.expect("write_bytes() type must be sized");
|
2017-03-13 19:47:08 -05:00
|
|
|
let ptr = arg_vals[0].read_ptr(&self.memory)?;
|
2017-03-13 18:28:29 -05:00
|
|
|
let count = self.value_to_primval(arg_vals[2], usize)?.to_u64()?;
|
2017-03-13 20:07:25 -05:00
|
|
|
self.memory.check_align(ptr, ty_align, size * count)?;
|
2017-03-13 19:47:08 -05:00
|
|
|
self.memory.write_repeat(ptr, val_byte, size * count)?;
|
2017-03-13 18:28:29 -05:00
|
|
|
}
|
|
|
|
|
2016-09-20 09:05:30 -05:00
|
|
|
name => return Err(EvalError::Unimplemented(format!("unimplemented intrinsic: {}", name))),
|
|
|
|
}
|
|
|
|
|
2016-11-04 11:51:13 -05:00
|
|
|
self.goto_block(target);
|
|
|
|
|
2016-09-20 09:05:30 -05:00
|
|
|
// 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(())
|
|
|
|
}
|
2016-09-22 06:00:43 -05:00
|
|
|
|
2017-02-09 01:38:01 -06:00
|
|
|
pub fn size_and_align_of_dst(
|
2016-09-22 06:00:43 -05:00
|
|
|
&self,
|
|
|
|
ty: ty::Ty<'tcx>,
|
2016-09-23 03:27:14 -05:00
|
|
|
value: Value,
|
2016-09-22 06:00:43 -05:00
|
|
|
) -> EvalResult<'tcx, (u64, u64)> {
|
2016-11-17 10:23:40 -06:00
|
|
|
if let Some(size) = self.type_size(ty)? {
|
|
|
|
Ok((size as u64, self.type_align(ty)? as u64))
|
2016-09-22 06:00:43 -05:00
|
|
|
} else {
|
|
|
|
match ty.sty {
|
|
|
|
ty::TyAdt(def, substs) => {
|
|
|
|
// First get the size of all statically known fields.
|
|
|
|
// Don't use type_of::sizing_type_of because that expects t to be sized,
|
|
|
|
// and it also rounds up to alignment, which we want to avoid,
|
|
|
|
// as the unsized field's alignment could be smaller.
|
|
|
|
assert!(!ty.is_simd());
|
2016-11-17 10:23:40 -06:00
|
|
|
let layout = self.type_layout(ty)?;
|
2016-09-22 06:00:43 -05:00
|
|
|
debug!("DST {} layout: {:?}", ty, layout);
|
|
|
|
|
|
|
|
let (sized_size, sized_align) = match *layout {
|
|
|
|
ty::layout::Layout::Univariant { ref variant, .. } => {
|
2017-02-09 06:00:30 -06:00
|
|
|
(variant.offsets.last().map_or(0, |o| o.bytes()), variant.align)
|
2016-09-22 06:00:43 -05:00
|
|
|
}
|
|
|
|
_ => {
|
|
|
|
bug!("size_and_align_of_dst: expcted Univariant for `{}`, found {:#?}",
|
|
|
|
ty, layout);
|
|
|
|
}
|
|
|
|
};
|
2017-02-09 06:00:30 -06:00
|
|
|
debug!("DST {} statically sized prefix size: {} align: {:?}",
|
2016-09-22 06:00:43 -05:00
|
|
|
ty, sized_size, sized_align);
|
|
|
|
|
|
|
|
// Recurse to get the size of the dynamically sized field (must be
|
|
|
|
// the last field).
|
|
|
|
let last_field = def.struct_variant().fields.last().unwrap();
|
|
|
|
let field_ty = self.field_ty(substs, last_field);
|
|
|
|
let (unsized_size, unsized_align) = self.size_and_align_of_dst(field_ty, value)?;
|
|
|
|
|
|
|
|
// FIXME (#26403, #27023): We should be adding padding
|
|
|
|
// to `sized_size` (to accommodate the `unsized_align`
|
|
|
|
// required of the unsized field that follows) before
|
|
|
|
// summing it with `sized_size`. (Note that since #26403
|
|
|
|
// is unfixed, we do not yet add the necessary padding
|
|
|
|
// here. But this is where the add would go.)
|
|
|
|
|
|
|
|
// Return the sum of sizes and max of aligns.
|
|
|
|
let size = sized_size + unsized_size;
|
|
|
|
|
|
|
|
// Choose max of two known alignments (combined value must
|
|
|
|
// be aligned according to more restrictive of the two).
|
2017-02-09 06:00:30 -06:00
|
|
|
let align = sized_align.max(Align::from_bytes(unsized_align, unsized_align).unwrap());
|
2016-09-22 06:00:43 -05:00
|
|
|
|
|
|
|
// Issue #27023: must add any necessary padding to `size`
|
|
|
|
// (to make it a multiple of `align`) before returning it.
|
|
|
|
//
|
|
|
|
// Namely, the returned size should be, in C notation:
|
|
|
|
//
|
|
|
|
// `size + ((size & (align-1)) ? align : 0)`
|
|
|
|
//
|
|
|
|
// emulated via the semi-standard fast bit trick:
|
|
|
|
//
|
|
|
|
// `(size + (align-1)) & -align`
|
|
|
|
|
2017-02-09 06:00:30 -06:00
|
|
|
let size = Size::from_bytes(size).abi_align(align).bytes();
|
|
|
|
Ok((size, align.abi()))
|
2016-09-22 06:00:43 -05:00
|
|
|
}
|
2016-12-02 21:44:59 -06:00
|
|
|
ty::TyDynamic(..) => {
|
2016-10-16 03:12:26 -05:00
|
|
|
let (_, vtable) = value.expect_ptr_vtable_pair(&self.memory)?;
|
2016-09-22 06:00:43 -05:00
|
|
|
// the second entry in the vtable is the dynamic size of the object.
|
2017-02-15 02:35:43 -06:00
|
|
|
self.read_size_and_align_from_vtable(vtable)
|
2016-09-22 06:00:43 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
ty::TySlice(_) | ty::TyStr => {
|
|
|
|
let elem_ty = ty.sequence_element_type(self.tcx);
|
2016-11-17 10:23:40 -06:00
|
|
|
let elem_size = self.type_size(elem_ty)?.expect("slice element must be sized") as u64;
|
2016-11-15 07:12:49 -06:00
|
|
|
let (_, len) = value.expect_slice(&self.memory)?;
|
2016-11-17 10:23:40 -06:00
|
|
|
let align = self.type_align(elem_ty)?;
|
2016-09-23 03:27:14 -05:00
|
|
|
Ok((len * elem_size, align as u64))
|
2016-09-22 06:00:43 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
_ => bug!("size_of_val::<{:?}>", ty),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/// Returns the normalized type of a struct field
|
|
|
|
fn field_ty(
|
|
|
|
&self,
|
|
|
|
param_substs: &Substs<'tcx>,
|
2016-12-06 08:41:28 -06:00
|
|
|
f: &ty::FieldDef,
|
|
|
|
) -> ty::Ty<'tcx> {
|
2016-09-22 06:00:43 -05:00
|
|
|
self.tcx.normalize_associated_type(&f.ty(self.tcx, param_substs))
|
|
|
|
}
|
2016-09-20 09:05:30 -05:00
|
|
|
}
|
2016-09-29 09:42:01 -05:00
|
|
|
|
2016-12-17 05:09:57 -06:00
|
|
|
fn numeric_intrinsic<'tcx>(
|
|
|
|
name: &str,
|
|
|
|
val: PrimVal,
|
|
|
|
kind: PrimValKind
|
|
|
|
) -> EvalResult<'tcx, PrimVal> {
|
|
|
|
macro_rules! integer_intrinsic {
|
|
|
|
($name:expr, $val:expr, $kind:expr, $method:ident) => ({
|
|
|
|
let val = $val;
|
|
|
|
let bytes = val.to_bytes()?;
|
|
|
|
|
|
|
|
use value::PrimValKind::*;
|
|
|
|
let result_bytes = match $kind {
|
2017-01-12 01:28:42 -06:00
|
|
|
I8 => (bytes as i8).$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,
|
2016-12-17 05:09:57 -06:00
|
|
|
_ => bug!("invalid `{}` argument: {:?}", $name, val),
|
|
|
|
};
|
|
|
|
|
|
|
|
PrimVal::Bytes(result_bytes)
|
|
|
|
});
|
|
|
|
}
|
2016-10-20 05:42:19 -05:00
|
|
|
|
2016-12-17 05:09:57 -06:00
|
|
|
let result_val = match name {
|
2016-11-27 00:58:01 -06:00
|
|
|
"bswap" => integer_intrinsic!("bswap", val, kind, swap_bytes),
|
|
|
|
"ctlz" => integer_intrinsic!("ctlz", val, kind, leading_zeros),
|
|
|
|
"ctpop" => integer_intrinsic!("ctpop", val, kind, count_ones),
|
|
|
|
"cttz" => integer_intrinsic!("cttz", val, kind, trailing_zeros),
|
2016-10-20 05:42:19 -05:00
|
|
|
_ => bug!("not a numeric intrinsic: {}", name),
|
2016-12-17 05:09:57 -06:00
|
|
|
};
|
|
|
|
|
|
|
|
Ok(result_val)
|
2016-09-29 09:42:01 -05:00
|
|
|
}
|