103 lines
3.7 KiB
Rust
103 lines
3.7 KiB
Rust
mod backtrace;
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pub mod foreign_items;
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pub mod intrinsics;
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pub mod posix;
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pub mod windows;
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pub mod dlsym;
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pub mod env;
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pub mod os_str;
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pub mod panic;
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pub mod time;
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pub mod tls;
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// End module management, begin local code
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use log::trace;
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use rustc_middle::{mir, ty};
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use rustc_target::spec::abi::Abi;
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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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abi: Abi,
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args: &[OpTy<'tcx, Tag>],
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ret: Option<(&PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
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unwind: StackPopUnwind,
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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 &[ref ptr, ref align] = check_arg_count(args)?;
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if this.align_offset(ptr, align, ret, unwind)? {
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return Ok(None);
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}
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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(), abi, args, ret, unwind);
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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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/// Returns `true` if the computation was performed, and `false` if we should just evaluate
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/// the actual MIR of `align_offset`.
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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: StackPopUnwind,
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) -> InterpResult<'tcx, bool> {
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let this = self.eval_context_mut();
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let (dest, ret) = ret.unwrap();
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if this.memory.extra.check_alignment != AlignmentCheck::Symbolic {
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// Just use actual implementation.
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return Ok(false);
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}
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let req_align = this.read_scalar(align_op)?.to_machine_usize(this)?;
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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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this.start_panic("align_offset: align is not a power-of-two", unwind)?;
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return Ok(true); // nothing left to do
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}
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let ptr = this.read_pointer(ptr_op)?;
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if let Ok(ptr) = ptr.into_pointer_or_addr() {
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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.provenance.alloc_id, AllocCheck::MaybeDead)?;
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if cur_align.bytes() >= req_align {
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// If the allocation alignment is at least the required alignment we use the
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// real implementation.
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return Ok(false);
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}
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}
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// Return error result (usize::MAX), and jump to caller.
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this.write_scalar(Scalar::from_machine_usize(this.machine_usize_max(), this), dest)?;
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this.go_to_block(ret);
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Ok(true)
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}
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}
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