-pub mod dlsym;
-pub mod env;
+mod backtrace;
pub mod foreign_items;
-pub mod fs;
pub mod intrinsics;
+pub mod unix;
+pub mod windows;
+
+pub mod dlsym;
+pub mod env;
pub mod os_str;
pub mod panic;
-pub mod sync;
-pub mod threads;
pub mod time;
pub mod tls;
-use std::convert::TryFrom;
+// End module management, begin local code
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::MiriEvalContext<'mir, 'tcx> {}
pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
fn find_mir_or_eval_fn(
&mut self,
instance: ty::Instance<'tcx>,
+ abi: Abi,
args: &[OpTy<'tcx, Tag>],
- ret: Option<(PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
- unwind: Option<mir::BasicBlock>,
- ) -> InterpResult<'tcx, Option<&'mir mir::Body<'tcx>>> {
+ dest: &PlaceTy<'tcx, Tag>,
+ ret: Option<mir::BasicBlock>,
+ unwind: StackPopUnwind,
+ ) -> InterpResult<'tcx, Option<(&'mir mir::Body<'tcx>, ty::Instance<'tcx>)>> {
let this = self.eval_context_mut();
- trace!("eval_fn_call: {:#?}, {:?}", instance, ret.map(|p| *p.0));
+ trace!("eval_fn_call: {:#?}, {:?}", instance, dest);
// 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()) {
- this.align_offset(args[0], args[1], ret, unwind)?;
- return Ok(None);
+ let [ptr, align] = check_arg_count(args)?;
+ if this.align_offset(ptr, align, dest, ret, unwind)? {
+ return Ok(None);
+ }
}
// Try to see if we can do something about foreign items.
// to run extra MIR), and Ok(Some(body)) if we found MIR to run for the
// foreign function
// Any needed call to `goto_block` will be performed by `emulate_foreign_item`.
- return this.emulate_foreign_item(instance.def_id(), args, ret, unwind);
- }
-
- // Better error message for panics on Windows.
- let def_id = instance.def_id();
- if Some(def_id) == this.tcx.lang_items().begin_panic_fn() ||
- Some(def_id) == this.tcx.lang_items().panic_impl()
- {
- this.check_panic_supported()?;
+ return this.emulate_foreign_item(instance.def_id(), abi, args, dest, ret, unwind);
}
// Otherwise, load the MIR.
- Ok(Some(&*this.load_mir(instance.def, None)?))
+ Ok(Some((&*this.load_mir(instance.def, None)?, instance)))
}
+ /// Returns `true` if the computation was performed, and `false` if we should just evaluate
+ /// the actual MIR of `align_offset`.
fn align_offset(
&mut self,
- ptr_op: OpTy<'tcx, Tag>,
- align_op: OpTy<'tcx, Tag>,
- ret: Option<(PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
- unwind: Option<mir::BasicBlock>,
- ) -> InterpResult<'tcx> {
+ ptr_op: &OpTy<'tcx, Tag>,
+ align_op: &OpTy<'tcx, Tag>,
+ dest: &PlaceTy<'tcx, Tag>,
+ ret: Option<mir::BasicBlock>,
+ unwind: StackPopUnwind,
+ ) -> InterpResult<'tcx, bool> {
let this = self.eval_context_mut();
- let (dest, ret) = ret.unwrap();
+ let ret = ret.unwrap();
- let req_align = this
- .force_bits(this.read_scalar(align_op)?.not_undef()?, this.pointer_size())?;
+ if this.machine.check_alignment != AlignmentCheck::Symbolic {
+ // Just use actual implementation.
+ return Ok(false);
+ }
+
+ let req_align = this.read_scalar(align_op)?.to_machine_usize(this)?;
// Stop if the alignment is not a power of two.
if !req_align.is_power_of_two() {
- return this.start_panic("align_offset: align is not a power-of-two", unwind);
+ this.start_panic("align_offset: align is not a power-of-two", unwind)?;
+ return Ok(true); // nothing left to do
}
- let ptr_scalar = this.read_scalar(ptr_op)?.not_undef()?;
-
- // Default: no result.
- let mut result = this.machine_usize_max();
- if let Ok(ptr) = this.force_ptr(ptr_scalar) {
+ let ptr = this.read_pointer(ptr_op)?;
+ if let Ok((alloc_id, _offset, _)) = this.ptr_try_get_alloc_id(ptr) {
// Only do anything if we can identify the allocation this goes to.
- let cur_align =
- this.memory.get_size_and_align(ptr.alloc_id, AllocCheck::MaybeDead)?.1.bytes();
- if u128::from(cur_align) >= req_align {
+ let (_, cur_align) = this.get_alloc_size_and_align(alloc_id, AllocCheck::MaybeDead)?;
+ if cur_align.bytes() >= req_align {
// If the allocation alignment is at least the required alignment we use the
- // libcore implementation.
- // FIXME: is this correct in case of truncation?
- result = u64::try_from(
- (this.force_bits(ptr_scalar, this.pointer_size())? as *const i8)
- .align_offset(usize::try_from(req_align).unwrap())
- ).unwrap();
+ // real implementation.
+ return Ok(false);
}
}
- // Return result, and jump to caller.
- this.write_scalar(Scalar::from_machine_usize(result, this), dest)?;
+ // Return error result (usize::MAX), and jump to caller.
+ this.write_scalar(Scalar::from_machine_usize(this.machine_usize_max(), this), dest)?;
this.go_to_block(ret);
- Ok(())
+ Ok(true)
}
}