compiler/rustc_mir_dataflow/src/lib.rs

   1 #![feature(associated_type_defaults)]
   2 #![feature(box_patterns)]
   3 #![feature(exact_size_is_empty)]
   4 #![feature(min_specialization)]
   5 #![feature(once_cell)]
   6 #![feature(stmt_expr_attributes)]
   7 #![feature(trusted_step)]
   8 #![recursion_limit = "256"]
   9 #![deny(rustc::untranslatable_diagnostic)]
  10 #![deny(rustc::diagnostic_outside_of_impl)]
  11
  12 #[macro_use]
  13 extern crate tracing;
  14 #[macro_use]
  15 extern crate rustc_middle;
  16
  17 use rustc_ast::MetaItem;
  18 use rustc_hir::def_id::DefId;
  19 use rustc_middle::ty::{self, TyCtxt};
  20 use rustc_span::symbol::{sym, Symbol};
  21
  22 pub use self::drop_flag_effects::{
  23     drop_flag_effects_for_function_entry, drop_flag_effects_for_location,
  24     move_path_children_matching, on_all_children_bits, on_all_drop_children_bits,
  25     on_lookup_result_bits,
  26 };
  27 pub use self::framework::{
  28     fmt, graphviz, lattice, visit_results, Analysis, AnalysisDomain, Backward, CallReturnPlaces,
  29     Direction, Engine, Forward, GenKill, GenKillAnalysis, JoinSemiLattice, Results, ResultsCursor,
  30     ResultsRefCursor, ResultsVisitable, ResultsVisitor, SwitchIntEdgeEffects,
  31 };
  32
  33 use self::move_paths::MoveData;
  34
  35 pub mod drop_flag_effects;
  36 pub mod elaborate_drops;
  37 mod errors;
  38 mod framework;
  39 pub mod impls;
  40 pub mod move_paths;
  41 pub mod rustc_peek;
  42 pub mod storage;
  43 pub mod un_derefer;
  44 pub mod value_analysis;
  45
  46 pub(crate) mod indexes {
  47     pub(crate) use super::move_paths::MovePathIndex;
  48 }
  49
  50 pub struct MoveDataParamEnv<'tcx> {
  51     pub move_data: MoveData<'tcx>,
  52     pub param_env: ty::ParamEnv<'tcx>,
  53 }
  54
  55 pub fn has_rustc_mir_with(tcx: TyCtxt<'_>, def_id: DefId, name: Symbol) -> Option<MetaItem> {
  56     for attr in tcx.get_attrs(def_id, sym::rustc_mir) {
  57         let items = attr.meta_item_list();
  58         for item in items.iter().flat_map(|l| l.iter()) {
  59             match item.meta_item() {
  60                 Some(mi) if mi.has_name(name) => return Some(mi.clone()),
  61                 _ => continue,
  62             }
  63         }
  64     }
  65     None
  66 }