#![warn(clippy::arithmetic_side_effects)]
mod backtrace;
#[cfg(target_os = "linux")]
pub mod ffi_support;
pub mod foreign_items;
pub mod intrinsics;
pub mod unix;
pub mod windows;
mod x86;
pub mod dlsym;
pub mod env;
pub mod os_str;
pub mod panic;
pub mod time;
pub mod tls;
use log::trace;
use rustc_middle::{mir, ty};
use rustc_target::spec::abi::Abi;
use crate::*;
use helpers::check_arg_count;
impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriInterpCx<'mir, 'tcx> {}
pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
fn find_mir_or_eval_fn(
&mut self,
instance: ty::Instance<'tcx>,
abi: Abi,
args: &[FnArg<'tcx, Provenance>],
dest: &PlaceTy<'tcx, Provenance>,
ret: Option<mir::BasicBlock>,
unwind: mir::UnwindAction,
) -> InterpResult<'tcx, Option<(&'mir mir::Body<'tcx>, ty::Instance<'tcx>)>> {
let this = self.eval_context_mut();
trace!("eval_fn_call: {:#?}, {:?}", instance, dest);
if this.tcx.lang_items().align_offset_fn() == Some(instance.def.def_id()) {
let args = this.copy_fn_args(args)?;
let [ptr, align] = check_arg_count(&args)?;
if this.align_offset(ptr, align, dest, ret, unwind)? {
return Ok(None);
}
}
if this.tcx.is_foreign_item(instance.def_id()) {
let args = this.copy_fn_args(args)?; return this.emulate_foreign_item(instance.def_id(), abi, &args, dest, ret, unwind);
}
Ok(Some((this.load_mir(instance.def, None)?, instance)))
}
fn align_offset(
&mut self,
ptr_op: &OpTy<'tcx, Provenance>,
align_op: &OpTy<'tcx, Provenance>,
dest: &PlaceTy<'tcx, Provenance>,
ret: Option<mir::BasicBlock>,
unwind: mir::UnwindAction,
) -> InterpResult<'tcx, bool> {
let this = self.eval_context_mut();
let ret = ret.unwrap();
if this.machine.check_alignment != AlignmentCheck::Symbolic {
return Ok(false);
}
let req_align = this.read_target_usize(align_op)?;
if !req_align.is_power_of_two() {
this.start_panic("align_offset: align is not a power-of-two", unwind)?;
return Ok(true); }
let ptr = this.read_pointer(ptr_op)?;
if ptr.provenance.is_none() {
return Ok(false);
}
if let Ok((alloc_id, _offset, _)) = this.ptr_try_get_alloc_id(ptr) {
let (_size, cur_align, _kind) = this.get_alloc_info(alloc_id);
if cur_align.bytes() >= req_align {
return Ok(false);
}
}
this.write_scalar(Scalar::from_target_usize(this.target_usize_max(), this), dest)?;
this.go_to_block(ret);
Ok(true)
}
}