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mod.rs
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mod.rs
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pub mod foreign_items;
pub mod intrinsics;
pub mod tls;
pub mod dlsym;
use rustc::{ty, mir};
use crate::*;
impl<'mir, 'tcx> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
fn find_fn(
&mut self,
instance: ty::Instance<'tcx>,
args: &[OpTy<'tcx, Tag>],
dest: Option<PlaceTy<'tcx, Tag>>,
ret: Option<mir::BasicBlock>,
) -> InterpResult<'tcx, Option<&'mir mir::Body<'tcx>>> {
let this = self.eval_context_mut();
trace!("eval_fn_call: {:#?}, {:?}", instance, dest.map(|place| *place));
// First, run the common hooks also supported by CTFE.
if this.hook_fn(instance, args, dest)? {
this.goto_block(ret)?;
return Ok(None);
}
// There are some more lang items we want to hook that CTFE does not hook (yet).
if this.tcx.lang_items().align_offset_fn() == Some(instance.def.def_id()) {
// FIXME: return a real value in case the target allocation has an
// alignment bigger than the one requested.
let n = u128::max_value();
let dest = dest.unwrap();
let n = this.truncate(n, dest.layout);
this.write_scalar(Scalar::from_uint(n, dest.layout.size), dest)?;
this.goto_block(ret)?;
return Ok(None);
}
// Try to see if we can do something about foreign items.
if this.tcx.is_foreign_item(instance.def_id()) {
// An external function that we cannot find MIR for, but we can still run enough
// of them to make miri viable.
this.emulate_foreign_item(instance.def_id(), args, dest, ret)?;
// `goto_block` already handled.
return Ok(None);
}
// Otherwise, load the MIR.
Ok(Some(this.load_mir(instance.def)?))
}
}