57 lines
1.5 KiB
Rust
57 lines
1.5 KiB
Rust
use crate::prelude::*;
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use rustc::mir::StatementKind::*;
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bitflags::bitflags! {
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pub struct Flags: u8 {
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const NOT_SSA = 0b00000001;
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}
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}
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pub fn analyze(fx: &FunctionCx<'_, '_, impl Backend>) -> HashMap<Local, Flags> {
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let mut flag_map = HashMap::new();
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for local in fx.mir.local_decls.indices() {
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flag_map.insert(local, Flags::empty());
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}
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for (local, local_decl) in fx.mir.local_decls.iter_enumerated() {
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if fx.clif_type(local_decl.ty).is_none() {
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not_ssa(&mut flag_map, local);
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}
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}
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for bb in fx.mir.basic_blocks().iter() {
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for stmt in bb.statements.iter() {
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match &stmt.kind {
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Assign(_, rval) => match &**rval {
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Rvalue::Ref(_, _, place) => analyze_non_ssa_place(&mut flag_map, place),
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_ => {}
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},
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_ => {}
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}
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}
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match &bb.terminator().kind {
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TerminatorKind::Call {
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destination: Some((place, _)),
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..
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} => analyze_non_ssa_place(&mut flag_map, place),
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_ => {}
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}
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}
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flag_map
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}
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fn analyze_non_ssa_place(flag_map: &mut HashMap<Local, Flags>, place: &Place) {
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match place.base {
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PlaceBase::Local(local) => not_ssa(flag_map, local),
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_ => {}
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}
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}
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fn not_ssa<L: ::std::borrow::Borrow<Local>>(flag_map: &mut HashMap<Local, Flags>, local: L) {
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*flag_map.get_mut(local.borrow()).unwrap() |= Flags::NOT_SSA;
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}
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