1 use rustc_middle::thir::{self, *};
2 use rustc_middle::ty::Const;
4 pub trait Visitor<'a, 'tcx: 'a>: Sized {
5 fn thir(&self) -> &'a Thir<'tcx>;
7 fn visit_expr(&mut self, expr: &Expr<'tcx>) {
11 fn visit_stmt(&mut self, stmt: &Stmt<'tcx>) {
12 walk_stmt(self, stmt);
15 fn visit_block(&mut self, block: &Block) {
16 walk_block(self, block);
19 fn visit_arm(&mut self, arm: &Arm<'tcx>) {
23 fn visit_const(&mut self, _cnst: &'tcx Const<'tcx>) {}
26 pub fn walk_expr<'a, 'tcx: 'a, V: Visitor<'a, 'tcx>>(visitor: &mut V, expr: &Expr<'tcx>) {
29 Scope { value, region_scope: _, lint_level: _ } => {
30 visitor.visit_expr(&visitor.thir()[value])
32 Box { value } => visitor.visit_expr(&visitor.thir()[value]),
33 If { cond, then, else_opt } => {
34 visitor.visit_expr(&visitor.thir()[cond]);
35 visitor.visit_expr(&visitor.thir()[then]);
36 if let Some(else_expr) = else_opt {
37 visitor.visit_expr(&visitor.thir()[else_expr]);
40 Call { fun, ref args, ty: _, from_hir_call: _, fn_span: _ } => {
41 visitor.visit_expr(&visitor.thir()[fun]);
43 visitor.visit_expr(&visitor.thir()[arg]);
46 Deref { arg } => visitor.visit_expr(&visitor.thir()[arg]),
47 Binary { lhs, rhs, op: _ } | LogicalOp { lhs, rhs, op: _ } => {
48 visitor.visit_expr(&visitor.thir()[lhs]);
49 visitor.visit_expr(&visitor.thir()[rhs]);
51 Unary { arg, op: _ } => visitor.visit_expr(&visitor.thir()[arg]),
52 Cast { source } => visitor.visit_expr(&visitor.thir()[source]),
53 Use { source } => visitor.visit_expr(&visitor.thir()[source]),
54 NeverToAny { source } => visitor.visit_expr(&visitor.thir()[source]),
55 Pointer { source, cast: _ } => visitor.visit_expr(&visitor.thir()[source]),
56 Loop { body } => visitor.visit_expr(&visitor.thir()[body]),
57 Match { scrutinee, ref arms } => {
58 visitor.visit_expr(&visitor.thir()[scrutinee]);
60 visitor.visit_arm(&visitor.thir()[arm]);
63 Block { ref body } => visitor.visit_block(body),
64 Assign { lhs, rhs } | AssignOp { lhs, rhs, op: _ } => {
65 visitor.visit_expr(&visitor.thir()[lhs]);
66 visitor.visit_expr(&visitor.thir()[rhs]);
68 Field { lhs, name: _ } => visitor.visit_expr(&visitor.thir()[lhs]),
69 Index { lhs, index } => {
70 visitor.visit_expr(&visitor.thir()[lhs]);
71 visitor.visit_expr(&visitor.thir()[index]);
73 VarRef { id: _ } | UpvarRef { closure_def_id: _, var_hir_id: _ } => {}
74 Borrow { arg, borrow_kind: _ } => visitor.visit_expr(&visitor.thir()[arg]),
75 AddressOf { arg, mutability: _ } => visitor.visit_expr(&visitor.thir()[arg]),
76 Break { value, label: _ } => {
77 if let Some(value) = value {
78 visitor.visit_expr(&visitor.thir()[value])
81 Continue { label: _ } => {}
83 if let Some(value) = value {
84 visitor.visit_expr(&visitor.thir()[value])
87 ConstBlock { value } => visitor.visit_const(value),
88 Repeat { value, count } => {
89 visitor.visit_expr(&visitor.thir()[value]);
90 visitor.visit_const(count);
92 Array { ref fields } | Tuple { ref fields } => {
93 for &field in &**fields {
94 visitor.visit_expr(&visitor.thir()[field]);
105 for field in &**fields {
106 visitor.visit_expr(&visitor.thir()[field.expr]);
108 if let Some(base) = base {
109 visitor.visit_expr(&visitor.thir()[base.base]);
112 PlaceTypeAscription { source, user_ty: _ } | ValueTypeAscription { source, user_ty: _ } => {
113 visitor.visit_expr(&visitor.thir()[source])
115 Closure { closure_id: _, substs: _, upvars: _, movability: _, fake_reads: _ } => {}
116 Literal { literal, user_ty: _, const_id: _ } => visitor.visit_const(literal),
117 StaticRef { literal, def_id: _ } => visitor.visit_const(literal),
118 InlineAsm { ref operands, template: _, options: _, line_spans: _ } => {
119 for op in &**operands {
120 use InlineAsmOperand::*;
123 | Out { expr: Some(expr), reg: _, late: _ }
124 | InOut { expr, reg: _, late: _ }
125 | SymFn { expr } => visitor.visit_expr(&visitor.thir()[*expr]),
126 SplitInOut { in_expr, out_expr, reg: _, late: _ } => {
127 visitor.visit_expr(&visitor.thir()[*in_expr]);
128 if let Some(out_expr) = out_expr {
129 visitor.visit_expr(&visitor.thir()[*out_expr]);
132 Out { expr: None, reg: _, late: _ }
133 | Const { value: _, span: _ }
134 | SymStatic { def_id: _ } => {}
138 ThreadLocalRef(_) => {}
139 LlvmInlineAsm { ref outputs, ref inputs, asm: _ } => {
140 for &out_expr in &**outputs {
141 visitor.visit_expr(&visitor.thir()[out_expr]);
143 for &in_expr in &**inputs {
144 visitor.visit_expr(&visitor.thir()[in_expr]);
147 Yield { value } => visitor.visit_expr(&visitor.thir()[value]),
151 pub fn walk_stmt<'a, 'tcx: 'a, V: Visitor<'a, 'tcx>>(visitor: &mut V, stmt: &Stmt<'tcx>) {
153 StmtKind::Expr { expr, scope: _ } => visitor.visit_expr(&visitor.thir()[expr]),
161 if let Some(init) = initializer {
162 visitor.visit_expr(&visitor.thir()[init]);
168 pub fn walk_block<'a, 'tcx: 'a, V: Visitor<'a, 'tcx>>(visitor: &mut V, block: &Block) {
169 for &stmt in &*block.stmts {
170 visitor.visit_stmt(&visitor.thir()[stmt]);
172 if let Some(expr) = block.expr {
173 visitor.visit_expr(&visitor.thir()[expr]);
177 pub fn walk_arm<'a, 'tcx: 'a, V: Visitor<'a, 'tcx>>(visitor: &mut V, arm: &Arm<'tcx>) {
179 Some(Guard::If(expr)) => visitor.visit_expr(&visitor.thir()[expr]),
180 Some(Guard::IfLet(ref _pat, expr)) => {
181 visitor.visit_expr(&visitor.thir()[expr]);
185 visitor.visit_expr(&visitor.thir()[arm.body]);