680 lines
26 KiB
Rust
680 lines
26 KiB
Rust
use rustc::mir;
|
|
use rustc::traits::Reveal;
|
|
use rustc::ty::layout::Layout;
|
|
use rustc::ty::{self, Ty};
|
|
|
|
use rustc_miri::interpret::{EvalResult, Lvalue, LvalueExtra, PrimVal, PrimValKind, Value, Pointer,
|
|
HasMemory, EvalContext, PtrAndAlign, ValTy};
|
|
|
|
use helpers::EvalContextExt as HelperEvalContextExt;
|
|
|
|
pub trait EvalContextExt<'tcx> {
|
|
fn call_intrinsic(
|
|
&mut self,
|
|
instance: ty::Instance<'tcx>,
|
|
args: &[ValTy<'tcx>],
|
|
dest: Lvalue,
|
|
dest_ty: Ty<'tcx>,
|
|
dest_layout: &'tcx Layout,
|
|
target: mir::BasicBlock,
|
|
) -> EvalResult<'tcx>;
|
|
}
|
|
|
|
impl<'a, 'tcx> EvalContextExt<'tcx> for EvalContext<'a, 'tcx, super::Evaluator> {
|
|
fn call_intrinsic(
|
|
&mut self,
|
|
instance: ty::Instance<'tcx>,
|
|
args: &[ValTy<'tcx>],
|
|
dest: Lvalue,
|
|
dest_ty: Ty<'tcx>,
|
|
dest_layout: &'tcx Layout,
|
|
target: mir::BasicBlock,
|
|
) -> EvalResult<'tcx> {
|
|
let substs = instance.substs;
|
|
|
|
let intrinsic_name = &self.tcx.item_name(instance.def_id()).as_str()[..];
|
|
match intrinsic_name {
|
|
"add_with_overflow" => {
|
|
self.intrinsic_with_overflow(
|
|
mir::BinOp::Add,
|
|
args[0],
|
|
args[1],
|
|
dest,
|
|
dest_ty,
|
|
)?
|
|
}
|
|
|
|
"sub_with_overflow" => {
|
|
self.intrinsic_with_overflow(
|
|
mir::BinOp::Sub,
|
|
args[0],
|
|
args[1],
|
|
dest,
|
|
dest_ty,
|
|
)?
|
|
}
|
|
|
|
"mul_with_overflow" => {
|
|
self.intrinsic_with_overflow(
|
|
mir::BinOp::Mul,
|
|
args[0],
|
|
args[1],
|
|
dest,
|
|
dest_ty,
|
|
)?
|
|
}
|
|
|
|
"arith_offset" => {
|
|
let offset = self.value_to_primval(args[1])?.to_i128()? as i64;
|
|
let ptr = args[0].into_ptr(&self.memory)?;
|
|
let result_ptr = self.wrapping_pointer_offset(ptr, substs.type_at(0), offset)?;
|
|
self.write_ptr(dest, result_ptr, dest_ty)?;
|
|
}
|
|
|
|
"assume" => {
|
|
let cond = self.value_to_primval(args[0])?.to_bool()?;
|
|
if !cond {
|
|
return err!(AssumptionNotHeld);
|
|
}
|
|
}
|
|
|
|
"atomic_load" |
|
|
"atomic_load_relaxed" |
|
|
"atomic_load_acq" |
|
|
"volatile_load" => {
|
|
let ptr = args[0].into_ptr(&self.memory)?;
|
|
let valty = ValTy {
|
|
value: Value::by_ref(ptr),
|
|
ty: substs.type_at(0),
|
|
};
|
|
self.write_value(valty, dest)?;
|
|
}
|
|
|
|
"atomic_store" |
|
|
"atomic_store_relaxed" |
|
|
"atomic_store_rel" |
|
|
"volatile_store" => {
|
|
let ty = substs.type_at(0);
|
|
let dest = args[0].into_ptr(&self.memory)?;
|
|
self.write_value_to_ptr(args[1].value, dest, ty)?;
|
|
}
|
|
|
|
"atomic_fence_acq" => {
|
|
// we are inherently singlethreaded and singlecored, this is a nop
|
|
}
|
|
|
|
_ if intrinsic_name.starts_with("atomic_xchg") => {
|
|
let ty = substs.type_at(0);
|
|
let ptr = args[0].into_ptr(&self.memory)?;
|
|
let change = self.value_to_primval(args[1])?;
|
|
let old = self.read_value(ptr, ty)?;
|
|
let old = match old {
|
|
Value::ByVal(val) => val,
|
|
Value::ByRef { .. } => bug!("just read the value, can't be byref"),
|
|
Value::ByValPair(..) => bug!("atomic_xchg doesn't work with nonprimitives"),
|
|
};
|
|
self.write_primval(dest, old, ty)?;
|
|
self.write_primval(
|
|
Lvalue::from_primval_ptr(ptr),
|
|
change,
|
|
ty,
|
|
)?;
|
|
}
|
|
|
|
_ if intrinsic_name.starts_with("atomic_cxchg") => {
|
|
let ty = substs.type_at(0);
|
|
let ptr = args[0].into_ptr(&self.memory)?;
|
|
let expect_old = self.value_to_primval(args[1])?;
|
|
let change = self.value_to_primval(args[2])?;
|
|
let old = self.read_value(ptr, ty)?;
|
|
let old = match old {
|
|
Value::ByVal(val) => val,
|
|
Value::ByRef { .. } => bug!("just read the value, can't be byref"),
|
|
Value::ByValPair(..) => bug!("atomic_cxchg doesn't work with nonprimitives"),
|
|
};
|
|
let (val, _) = self.binary_op(mir::BinOp::Eq, old, ty, expect_old, ty)?;
|
|
let dest = self.force_allocation(dest)?.to_ptr()?;
|
|
self.write_pair_to_ptr(old, val, dest, dest_ty)?;
|
|
self.write_primval(
|
|
Lvalue::from_primval_ptr(ptr),
|
|
change,
|
|
ty,
|
|
)?;
|
|
}
|
|
|
|
"atomic_or" |
|
|
"atomic_or_acq" |
|
|
"atomic_or_rel" |
|
|
"atomic_or_acqrel" |
|
|
"atomic_or_relaxed" |
|
|
"atomic_xor" |
|
|
"atomic_xor_acq" |
|
|
"atomic_xor_rel" |
|
|
"atomic_xor_acqrel" |
|
|
"atomic_xor_relaxed" |
|
|
"atomic_and" |
|
|
"atomic_and_acq" |
|
|
"atomic_and_rel" |
|
|
"atomic_and_acqrel" |
|
|
"atomic_and_relaxed" |
|
|
"atomic_xadd" |
|
|
"atomic_xadd_acq" |
|
|
"atomic_xadd_rel" |
|
|
"atomic_xadd_acqrel" |
|
|
"atomic_xadd_relaxed" |
|
|
"atomic_xsub" |
|
|
"atomic_xsub_acq" |
|
|
"atomic_xsub_rel" |
|
|
"atomic_xsub_acqrel" |
|
|
"atomic_xsub_relaxed" => {
|
|
let ty = substs.type_at(0);
|
|
let ptr = args[0].into_ptr(&self.memory)?;
|
|
let change = self.value_to_primval(args[1])?;
|
|
let old = self.read_value(ptr, ty)?;
|
|
let old = match old {
|
|
Value::ByVal(val) => val,
|
|
Value::ByRef { .. } => bug!("just read the value, can't be byref"),
|
|
Value::ByValPair(..) => {
|
|
bug!("atomic_xadd_relaxed doesn't work with nonprimitives")
|
|
}
|
|
};
|
|
self.write_primval(dest, old, ty)?;
|
|
let op = match intrinsic_name.split('_').nth(1).unwrap() {
|
|
"or" => mir::BinOp::BitOr,
|
|
"xor" => mir::BinOp::BitXor,
|
|
"and" => mir::BinOp::BitAnd,
|
|
"xadd" => mir::BinOp::Add,
|
|
"xsub" => mir::BinOp::Sub,
|
|
_ => bug!(),
|
|
};
|
|
// FIXME: what do atomics do on overflow?
|
|
let (val, _) = self.binary_op(op, old, ty, change, ty)?;
|
|
self.write_primval(Lvalue::from_primval_ptr(ptr), val, ty)?;
|
|
}
|
|
|
|
"breakpoint" => unimplemented!(), // halt miri
|
|
|
|
"copy" |
|
|
"copy_nonoverlapping" => {
|
|
let elem_ty = substs.type_at(0);
|
|
let elem_size = self.type_size(elem_ty)?.expect("cannot copy unsized value");
|
|
let count = self.value_to_primval(args[2])?.to_u64()?;
|
|
if count * elem_size != 0 {
|
|
// TODO: We do not even validate alignment for the 0-bytes case. libstd relies on this in vec::IntoIter::next.
|
|
// Also see the write_bytes intrinsic.
|
|
let elem_align = self.type_align(elem_ty)?;
|
|
let src = args[0].into_ptr(&self.memory)?;
|
|
let dest = args[1].into_ptr(&self.memory)?;
|
|
self.memory.copy(
|
|
src,
|
|
dest,
|
|
count * elem_size,
|
|
elem_align,
|
|
intrinsic_name.ends_with("_nonoverlapping"),
|
|
)?;
|
|
}
|
|
}
|
|
|
|
"ctpop" | "cttz" | "cttz_nonzero" | "ctlz" | "ctlz_nonzero" | "bswap" => {
|
|
let ty = substs.type_at(0);
|
|
let num = self.value_to_primval(args[0])?.to_bytes()?;
|
|
let kind = self.ty_to_primval_kind(ty)?;
|
|
let num = if intrinsic_name.ends_with("_nonzero") {
|
|
if num == 0 {
|
|
return err!(Intrinsic(format!("{} called on 0", intrinsic_name)));
|
|
}
|
|
numeric_intrinsic(intrinsic_name.trim_right_matches("_nonzero"), num, kind)?
|
|
} else {
|
|
numeric_intrinsic(intrinsic_name, num, kind)?
|
|
};
|
|
self.write_primval(dest, num, ty)?;
|
|
}
|
|
|
|
"discriminant_value" => {
|
|
let ty = substs.type_at(0);
|
|
let adt_ptr = args[0].into_ptr(&self.memory)?.to_ptr()?;
|
|
let discr_val = self.read_discriminant_value(adt_ptr, ty)?;
|
|
self.write_primval(dest, PrimVal::Bytes(discr_val), dest_ty)?;
|
|
}
|
|
|
|
"sinf32" | "fabsf32" | "cosf32" | "sqrtf32" | "expf32" | "exp2f32" | "logf32" |
|
|
"log10f32" | "log2f32" | "floorf32" | "ceilf32" | "truncf32" => {
|
|
let f = self.value_to_primval(args[0])?.to_f32()?;
|
|
let f = match intrinsic_name {
|
|
"sinf32" => f.sin(),
|
|
"fabsf32" => f.abs(),
|
|
"cosf32" => f.cos(),
|
|
"sqrtf32" => f.sqrt(),
|
|
"expf32" => f.exp(),
|
|
"exp2f32" => f.exp2(),
|
|
"logf32" => f.ln(),
|
|
"log10f32" => f.log10(),
|
|
"log2f32" => f.log2(),
|
|
"floorf32" => f.floor(),
|
|
"ceilf32" => f.ceil(),
|
|
"truncf32" => f.trunc(),
|
|
_ => bug!(),
|
|
};
|
|
self.write_primval(dest, PrimVal::from_f32(f), dest_ty)?;
|
|
}
|
|
|
|
"sinf64" | "fabsf64" | "cosf64" | "sqrtf64" | "expf64" | "exp2f64" | "logf64" |
|
|
"log10f64" | "log2f64" | "floorf64" | "ceilf64" | "truncf64" => {
|
|
let f = self.value_to_primval(args[0])?.to_f64()?;
|
|
let f = match intrinsic_name {
|
|
"sinf64" => f.sin(),
|
|
"fabsf64" => f.abs(),
|
|
"cosf64" => f.cos(),
|
|
"sqrtf64" => f.sqrt(),
|
|
"expf64" => f.exp(),
|
|
"exp2f64" => f.exp2(),
|
|
"logf64" => f.ln(),
|
|
"log10f64" => f.log10(),
|
|
"log2f64" => f.log2(),
|
|
"floorf64" => f.floor(),
|
|
"ceilf64" => f.ceil(),
|
|
"truncf64" => f.trunc(),
|
|
_ => bug!(),
|
|
};
|
|
self.write_primval(dest, PrimVal::from_f64(f), dest_ty)?;
|
|
}
|
|
|
|
"fadd_fast" | "fsub_fast" | "fmul_fast" | "fdiv_fast" | "frem_fast" => {
|
|
let ty = substs.type_at(0);
|
|
let a = self.value_to_primval(args[0])?;
|
|
let b = self.value_to_primval(args[1])?;
|
|
let op = match intrinsic_name {
|
|
"fadd_fast" => mir::BinOp::Add,
|
|
"fsub_fast" => mir::BinOp::Sub,
|
|
"fmul_fast" => mir::BinOp::Mul,
|
|
"fdiv_fast" => mir::BinOp::Div,
|
|
"frem_fast" => mir::BinOp::Rem,
|
|
_ => bug!(),
|
|
};
|
|
let result = self.binary_op(op, a, ty, b, ty)?;
|
|
self.write_primval(dest, result.0, dest_ty)?;
|
|
}
|
|
|
|
"likely" | "unlikely" | "forget" => {}
|
|
|
|
"init" => {
|
|
let size = self.type_size(dest_ty)?.expect("cannot zero unsized value");
|
|
let init = |this: &mut Self, val: Value| {
|
|
let zero_val = match val {
|
|
Value::ByRef(PtrAndAlign { ptr, .. }) => {
|
|
// These writes have no alignment restriction anyway.
|
|
this.memory.write_repeat(ptr, 0, size)?;
|
|
val
|
|
}
|
|
// TODO(solson): Revisit this, it's fishy to check for Undef here.
|
|
Value::ByVal(PrimVal::Undef) => {
|
|
match this.ty_to_primval_kind(dest_ty) {
|
|
Ok(_) => Value::ByVal(PrimVal::Bytes(0)),
|
|
Err(_) => {
|
|
let ptr = this.alloc_ptr_with_substs(dest_ty, substs)?;
|
|
let ptr = Pointer::from(PrimVal::Ptr(ptr));
|
|
this.memory.write_repeat(ptr, 0, size)?;
|
|
Value::by_ref(ptr)
|
|
}
|
|
}
|
|
}
|
|
Value::ByVal(_) => Value::ByVal(PrimVal::Bytes(0)),
|
|
Value::ByValPair(..) => {
|
|
Value::ByValPair(PrimVal::Bytes(0), PrimVal::Bytes(0))
|
|
}
|
|
};
|
|
Ok(zero_val)
|
|
};
|
|
match dest {
|
|
Lvalue::Local { frame, local } => self.modify_local(frame, local, init)?,
|
|
Lvalue::Ptr {
|
|
ptr: PtrAndAlign { ptr, aligned: true },
|
|
extra: LvalueExtra::None,
|
|
} => self.memory.write_repeat(ptr, 0, size)?,
|
|
Lvalue::Ptr { .. } => {
|
|
bug!("init intrinsic tried to write to fat or unaligned ptr target")
|
|
}
|
|
}
|
|
}
|
|
|
|
"min_align_of" => {
|
|
let elem_ty = substs.type_at(0);
|
|
let elem_align = self.type_align(elem_ty)?;
|
|
let align_val = PrimVal::from_u128(elem_align as u128);
|
|
self.write_primval(dest, align_val, dest_ty)?;
|
|
}
|
|
|
|
"pref_align_of" => {
|
|
let ty = substs.type_at(0);
|
|
let layout = self.type_layout(ty)?;
|
|
let align = layout.align(&self.tcx.data_layout).pref();
|
|
let align_val = PrimVal::from_u128(align as u128);
|
|
self.write_primval(dest, align_val, dest_ty)?;
|
|
}
|
|
|
|
"move_val_init" => {
|
|
let ty = substs.type_at(0);
|
|
let ptr = args[0].into_ptr(&self.memory)?;
|
|
self.write_value_to_ptr(args[1].value, ptr, ty)?;
|
|
}
|
|
|
|
"needs_drop" => {
|
|
let ty = substs.type_at(0);
|
|
let env = ty::ParamEnv::empty(Reveal::All);
|
|
let needs_drop = ty.needs_drop(self.tcx, env);
|
|
self.write_primval(
|
|
dest,
|
|
PrimVal::from_bool(needs_drop),
|
|
dest_ty,
|
|
)?;
|
|
}
|
|
|
|
"offset" => {
|
|
let offset = self.value_to_primval(args[1])?.to_i128()? as i64;
|
|
let ptr = args[0].into_ptr(&self.memory)?;
|
|
let result_ptr = self.pointer_offset(ptr, substs.type_at(0), offset)?;
|
|
self.write_ptr(dest, result_ptr, dest_ty)?;
|
|
}
|
|
|
|
"overflowing_sub" => {
|
|
self.intrinsic_overflowing(
|
|
mir::BinOp::Sub,
|
|
args[0],
|
|
args[1],
|
|
dest,
|
|
dest_ty,
|
|
)?;
|
|
}
|
|
|
|
"overflowing_mul" => {
|
|
self.intrinsic_overflowing(
|
|
mir::BinOp::Mul,
|
|
args[0],
|
|
args[1],
|
|
dest,
|
|
dest_ty,
|
|
)?;
|
|
}
|
|
|
|
"overflowing_add" => {
|
|
self.intrinsic_overflowing(
|
|
mir::BinOp::Add,
|
|
args[0],
|
|
args[1],
|
|
dest,
|
|
dest_ty,
|
|
)?;
|
|
}
|
|
|
|
"powf32" => {
|
|
let f = self.value_to_primval(args[0])?.to_f32()?;
|
|
let f2 = self.value_to_primval(args[1])?.to_f32()?;
|
|
self.write_primval(
|
|
dest,
|
|
PrimVal::from_f32(f.powf(f2)),
|
|
dest_ty,
|
|
)?;
|
|
}
|
|
|
|
"powf64" => {
|
|
let f = self.value_to_primval(args[0])?.to_f64()?;
|
|
let f2 = self.value_to_primval(args[1])?.to_f64()?;
|
|
self.write_primval(
|
|
dest,
|
|
PrimVal::from_f64(f.powf(f2)),
|
|
dest_ty,
|
|
)?;
|
|
}
|
|
|
|
"fmaf32" => {
|
|
let a = self.value_to_primval(args[0])?.to_f32()?;
|
|
let b = self.value_to_primval(args[1])?.to_f32()?;
|
|
let c = self.value_to_primval(args[2])?.to_f32()?;
|
|
self.write_primval(
|
|
dest,
|
|
PrimVal::from_f32(a * b + c),
|
|
dest_ty,
|
|
)?;
|
|
}
|
|
|
|
"fmaf64" => {
|
|
let a = self.value_to_primval(args[0])?.to_f64()?;
|
|
let b = self.value_to_primval(args[1])?.to_f64()?;
|
|
let c = self.value_to_primval(args[2])?.to_f64()?;
|
|
self.write_primval(
|
|
dest,
|
|
PrimVal::from_f64(a * b + c),
|
|
dest_ty,
|
|
)?;
|
|
}
|
|
|
|
"powif32" => {
|
|
let f = self.value_to_primval(args[0])?.to_f32()?;
|
|
let i = self.value_to_primval(args[1])?.to_i128()?;
|
|
self.write_primval(
|
|
dest,
|
|
PrimVal::from_f32(f.powi(i as i32)),
|
|
dest_ty,
|
|
)?;
|
|
}
|
|
|
|
"powif64" => {
|
|
let f = self.value_to_primval(args[0])?.to_f64()?;
|
|
let i = self.value_to_primval(args[1])?.to_i128()?;
|
|
self.write_primval(
|
|
dest,
|
|
PrimVal::from_f64(f.powi(i as i32)),
|
|
dest_ty,
|
|
)?;
|
|
}
|
|
|
|
"size_of" => {
|
|
let ty = substs.type_at(0);
|
|
let size = self.type_size(ty)?.expect(
|
|
"size_of intrinsic called on unsized value",
|
|
) as u128;
|
|
self.write_primval(dest, PrimVal::from_u128(size), dest_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 as u128),
|
|
dest_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 as u128),
|
|
dest_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_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_ty)?;
|
|
}
|
|
|
|
"transmute" => {
|
|
let src_ty = substs.type_at(0);
|
|
let ptr = self.force_allocation(dest)?.to_ptr()?;
|
|
self.write_maybe_aligned_mut(
|
|
/*aligned*/
|
|
false,
|
|
|ectx| {
|
|
ectx.write_value_to_ptr(args[0].value, ptr.into(), src_ty)
|
|
},
|
|
)?;
|
|
}
|
|
|
|
"unchecked_shl" => {
|
|
let bits = self.type_size(dest_ty)?.expect(
|
|
"intrinsic can't be called on unsized type",
|
|
) 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_ty,
|
|
)?;
|
|
}
|
|
|
|
"unchecked_shr" => {
|
|
let bits = self.type_size(dest_ty)?.expect(
|
|
"intrinsic can't be called on unsized type",
|
|
) 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_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_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_ty,
|
|
)?;
|
|
}
|
|
|
|
"uninit" => {
|
|
let size = dest_layout.size(&self.tcx.data_layout).bytes();
|
|
let uninit = |this: &mut Self, val: Value| match val {
|
|
Value::ByRef(PtrAndAlign { ptr, .. }) => {
|
|
this.memory.mark_definedness(ptr, size, false)?;
|
|
Ok(val)
|
|
}
|
|
_ => Ok(Value::ByVal(PrimVal::Undef)),
|
|
};
|
|
match dest {
|
|
Lvalue::Local { frame, local } => self.modify_local(frame, local, uninit)?,
|
|
Lvalue::Ptr {
|
|
ptr: PtrAndAlign { ptr, aligned: true },
|
|
extra: LvalueExtra::None,
|
|
} => self.memory.mark_definedness(ptr, size, false)?,
|
|
Lvalue::Ptr { .. } => {
|
|
bug!("uninit intrinsic tried to write to fat or unaligned ptr target")
|
|
}
|
|
}
|
|
}
|
|
|
|
"write_bytes" => {
|
|
let ty = substs.type_at(0);
|
|
let ty_align = self.type_align(ty)?;
|
|
let val_byte = self.value_to_primval(args[1])?.to_u128()? as u8;
|
|
let size = self.type_size(ty)?.expect(
|
|
"write_bytes() type must be sized",
|
|
);
|
|
let ptr = args[0].into_ptr(&self.memory)?;
|
|
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_align)?;
|
|
self.memory.write_repeat(ptr, val_byte, size * 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 {
|
|
($method:ident) => ({
|
|
use rustc_miri::interpret::PrimValKind::*;
|
|
let result_bytes = match kind {
|
|
I8 => (bytes as i8).$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)
|
|
}
|