use rustc_middle::mir;
use rustc_middle::ty;
use rustc_session::config::CrateType;
-use rustc_span::{symbol::sym, Symbol};
+use rustc_span::Symbol;
use rustc_target::{
abi::{Align, Size},
spec::abi::Abi,
};
use super::backtrace::EvalContextExt as _;
+use crate::helpers::convert::Truncate;
use crate::*;
/// Returned by `emulate_foreign_item_by_name`.
unwind: StackPopUnwind,
) -> InterpResult<'tcx, Option<(&'mir mir::Body<'tcx>, ty::Instance<'tcx>)>> {
let this = self.eval_context_mut();
- let attrs = this.tcx.get_attrs(def_id);
- let link_name = this
- .tcx
- .sess
- .first_attr_value_str_by_name(attrs, sym::link_name)
- .unwrap_or_else(|| this.tcx.item_name(def_id));
+ let link_name = this.item_link_name(def_id);
let tcx = this.tcx.tcx;
// First: functions that diverge.
} else {
Abi::System { unwind: false }
};
- let &[ref code] = this.check_shim(abi, exp_abi, link_name, args)?;
+ let [code] = this.check_shim(abi, exp_abi, link_name, args)?;
// it's really u32 for ExitProcess, but we have to put it into the `Exit` variant anyway
let code = this.read_scalar(code)?.to_i32()?;
throw_machine_stop!(TerminationInfo::Exit(code.into()));
}
"abort" => {
- let &[] =
- this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
throw_machine_stop!(TerminationInfo::Abort(
"the program aborted execution".to_owned()
))
match &*link_name.as_str() {
// Miri-specific extern functions
"miri_static_root" => {
- let &[ref ptr] = this.check_shim(abi, Abi::Rust, link_name, args)?;
+ let [ptr] = this.check_shim(abi, Abi::Rust, link_name, args)?;
let ptr = this.read_pointer(ptr)?;
let (alloc_id, offset, _) = this.ptr_get_alloc_id(ptr)?;
if offset != Size::ZERO {
// Standard C allocation
"malloc" => {
- let &[ref size] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [size] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
let size = this.read_scalar(size)?.to_machine_usize(this)?;
let res = this.malloc(size, /*zero_init:*/ false, MiriMemoryKind::C)?;
this.write_pointer(res, dest)?;
}
"calloc" => {
- let &[ref items, ref len] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [items, len] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
let items = this.read_scalar(items)?.to_machine_usize(this)?;
let len = this.read_scalar(len)?.to_machine_usize(this)?;
let size =
this.write_pointer(res, dest)?;
}
"free" => {
- let &[ref ptr] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [ptr] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
let ptr = this.read_pointer(ptr)?;
this.free(ptr, MiriMemoryKind::C)?;
}
"realloc" => {
- let &[ref old_ptr, ref new_size] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [old_ptr, new_size] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
let old_ptr = this.read_pointer(old_ptr)?;
let new_size = this.read_scalar(new_size)?.to_machine_usize(this)?;
let res = this.realloc(old_ptr, new_size, MiriMemoryKind::C)?;
// Rust allocation
"__rust_alloc" => {
- let &[ref size, ref align] = this.check_shim(abi, Abi::Rust, link_name, args)?;
+ let [size, align] = this.check_shim(abi, Abi::Rust, link_name, args)?;
let size = this.read_scalar(size)?.to_machine_usize(this)?;
let align = this.read_scalar(align)?.to_machine_usize(this)?;
});
}
"__rust_alloc_zeroed" => {
- let &[ref size, ref align] = this.check_shim(abi, Abi::Rust, link_name, args)?;
+ let [size, align] = this.check_shim(abi, Abi::Rust, link_name, args)?;
let size = this.read_scalar(size)?.to_machine_usize(this)?;
let align = this.read_scalar(align)?.to_machine_usize(this)?;
});
}
"__rust_dealloc" => {
- let &[ref ptr, ref old_size, ref align] = this.check_shim(abi, Abi::Rust, link_name, args)?;
+ let [ptr, old_size, align] = this.check_shim(abi, Abi::Rust, link_name, args)?;
let ptr = this.read_pointer(ptr)?;
let old_size = this.read_scalar(old_size)?.to_machine_usize(this)?;
let align = this.read_scalar(align)?.to_machine_usize(this)?;
});
}
"__rust_realloc" => {
- let &[ref ptr, ref old_size, ref align, ref new_size] = this.check_shim(abi, Abi::Rust, link_name, args)?;
+ let [ptr, old_size, align, new_size] = this.check_shim(abi, Abi::Rust, link_name, args)?;
let ptr = this.read_pointer(ptr)?;
let old_size = this.read_scalar(old_size)?.to_machine_usize(this)?;
let align = this.read_scalar(align)?.to_machine_usize(this)?;
// C memory handling functions
"memcmp" => {
- let &[ref left, ref right, ref n] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [left, right, n] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
let left = this.read_pointer(left)?;
let right = this.read_pointer(right)?;
let n = Size::from_bytes(this.read_scalar(n)?.to_machine_usize(this)?);
this.write_scalar(Scalar::from_i32(result), dest)?;
}
"memrchr" => {
- let &[ref ptr, ref val, ref num] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [ptr, val, num] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
let ptr = this.read_pointer(ptr)?;
let val = this.read_scalar(val)?.to_i32()? as u8;
let num = this.read_scalar(num)?.to_machine_usize(this)?;
}
}
"memchr" => {
- let &[ref ptr, ref val, ref num] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [ptr, val, num] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
let ptr = this.read_pointer(ptr)?;
let val = this.read_scalar(val)?.to_i32()? as u8;
let num = this.read_scalar(num)?.to_machine_usize(this)?;
}
}
"strlen" => {
- let &[ref ptr] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [ptr] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
let ptr = this.read_pointer(ptr)?;
let n = this.read_c_str(ptr)?.len();
this.write_scalar(Scalar::from_machine_usize(u64::try_from(n).unwrap(), this), dest)?;
| "asinf"
| "atanf"
=> {
- let &[ref f] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [f] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
// FIXME: Using host floats.
let f = f32::from_bits(this.read_scalar(f)?.to_u32()?);
let f = match &*link_name.as_str() {
| "hypotf"
| "atan2f"
=> {
- let &[ref f1, ref f2] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [f1, f2] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
// underscore case for windows, here and below
// (see https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/floating-point-primitives?view=vs-2019)
// FIXME: Using host floats.
| "asin"
| "atan"
=> {
- let &[ref f] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [f] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
// FIXME: Using host floats.
let f = f64::from_bits(this.read_scalar(f)?.to_u64()?);
let f = match &*link_name.as_str() {
| "hypot"
| "atan2"
=> {
- let &[ref f1, ref f2] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [f1, f2] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
// FIXME: Using host floats.
let f1 = f64::from_bits(this.read_scalar(f1)?.to_u64()?);
let f2 = f64::from_bits(this.read_scalar(f2)?.to_u64()?);
| "ldexp"
| "scalbn"
=> {
- let &[ref x, ref exp] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [x, exp] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
// For radix-2 (binary) systems, `ldexp` and `scalbn` are the same.
let x = this.read_scalar(x)?.to_f64()?;
let exp = this.read_scalar(exp)?.to_i32()?;
// Architecture-specific shims
"llvm.x86.addcarry.64" if this.tcx.sess.target.arch == "x86_64" => {
// Computes u8+u64+u64, returning tuple (u8,u64) comprising the output carry and truncated sum.
- let &[ref c_in, ref a, ref b] = this.check_shim(abi, Abi::Unadjusted, link_name, args)?;
+ let [c_in, a, b] = this.check_shim(abi, Abi::Unadjusted, link_name, args)?;
let c_in = this.read_scalar(c_in)?.to_u8()?;
let a = this.read_scalar(a)?.to_u64()?;
let b = this.read_scalar(b)?.to_u64()?;
- let wide_sum = c_in as u128 + a as u128 + b as u128;
- let (c_out, sum) = ((wide_sum >> 64) as u8, wide_sum as u64);
+ let wide_sum = u128::from(c_in) + u128::from(a) + u128::from(b);
+ let (c_out, sum) = ((wide_sum >> 64).truncate::<u8>(), wide_sum.truncate::<u64>());
let c_out_field = this.place_field(dest, 0)?;
this.write_scalar(Scalar::from_u8(c_out), &c_out_field)?;
this.write_scalar(Scalar::from_u64(sum), &sum_field)?;
}
"llvm.x86.sse2.pause" if this.tcx.sess.target.arch == "x86" || this.tcx.sess.target.arch == "x86_64" => {
- let &[] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+ let [] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
this.yield_active_thread();
}
"llvm.aarch64.isb" if this.tcx.sess.target.arch == "aarch64" => {
- let &[ref arg] = this.check_shim(abi, Abi::Unadjusted, link_name, args)?;
+ let [arg] = this.check_shim(abi, Abi::Unadjusted, link_name, args)?;
let arg = this.read_scalar(arg)?.to_i32()?;
match arg {
15 => { // SY ("full system scope")
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