107 lines
3.9 KiB
Rust
107 lines
3.9 KiB
Rust
pub mod dlsym;
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pub mod env;
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pub mod foreign_items;
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pub mod fs;
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pub mod intrinsics;
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pub mod os_str;
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pub mod panic;
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pub mod sync;
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pub mod thread;
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pub mod time;
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pub mod tls;
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use std::convert::TryFrom;
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use log::trace;
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use rustc_middle::{mir, ty};
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use crate::*;
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use helpers::check_arg_count;
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impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriEvalContext<'mir, 'tcx> {}
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pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx> {
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fn find_mir_or_eval_fn(
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&mut self,
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instance: ty::Instance<'tcx>,
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args: &[OpTy<'tcx, Tag>],
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ret: Option<(PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
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unwind: Option<mir::BasicBlock>,
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) -> InterpResult<'tcx, Option<&'mir mir::Body<'tcx>>> {
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let this = self.eval_context_mut();
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trace!("eval_fn_call: {:#?}, {:?}", instance, ret.map(|p| *p.0));
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// There are some more lang items we want to hook that CTFE does not hook (yet).
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if this.tcx.lang_items().align_offset_fn() == Some(instance.def.def_id()) {
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let &[ptr, align] = check_arg_count(args)?;
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this.align_offset(ptr, align, ret, unwind)?;
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return Ok(None);
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}
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// Try to see if we can do something about foreign items.
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if this.tcx.is_foreign_item(instance.def_id()) {
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// An external function call that does not have a MIR body. We either find MIR elsewhere
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// or emulate its effect.
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// This will be Ok(None) if we're emulating the intrinsic entirely within Miri (no need
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// to run extra MIR), and Ok(Some(body)) if we found MIR to run for the
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// foreign function
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// Any needed call to `goto_block` will be performed by `emulate_foreign_item`.
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return this.emulate_foreign_item(instance.def_id(), args, ret, unwind);
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}
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// Better error message for panics on Windows.
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let def_id = instance.def_id();
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if Some(def_id) == this.tcx.lang_items().begin_panic_fn() ||
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Some(def_id) == this.tcx.lang_items().panic_impl()
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{
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this.check_panic_supported()?;
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}
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// Otherwise, load the MIR.
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Ok(Some(&*this.load_mir(instance.def, None)?))
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}
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fn align_offset(
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&mut self,
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ptr_op: OpTy<'tcx, Tag>,
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align_op: OpTy<'tcx, Tag>,
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ret: Option<(PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
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unwind: Option<mir::BasicBlock>,
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) -> InterpResult<'tcx> {
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let this = self.eval_context_mut();
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let (dest, ret) = ret.unwrap();
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let req_align = this
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.force_bits(this.read_scalar(align_op)?.not_undef()?, this.pointer_size())?;
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// Stop if the alignment is not a power of two.
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if !req_align.is_power_of_two() {
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return this.start_panic("align_offset: align is not a power-of-two", unwind);
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}
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let ptr_scalar = this.read_scalar(ptr_op)?.not_undef()?;
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// Default: no result.
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let mut result = this.machine_usize_max();
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if let Ok(ptr) = this.force_ptr(ptr_scalar) {
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// Only do anything if we can identify the allocation this goes to.
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let cur_align =
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this.memory.get_size_and_align(ptr.alloc_id, AllocCheck::MaybeDead)?.1.bytes();
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if u128::from(cur_align) >= req_align {
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// If the allocation alignment is at least the required alignment we use the
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// libcore implementation.
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// FIXME: is this correct in case of truncation?
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result = u64::try_from(
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(this.force_bits(ptr_scalar, this.pointer_size())? as *const i8)
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.align_offset(usize::try_from(req_align).unwrap())
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).unwrap();
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}
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}
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// Return result, and jump to caller.
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this.write_scalar(Scalar::from_machine_usize(result, this), dest)?;
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this.go_to_block(ret);
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Ok(())
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}
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}
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