1use super::{Compiler, Symbol};
2use anyhow::Result;
3use dynamic::{Dynamic, Type};
4use parser::{BinaryOp, Expr, ExprKind, PatternKind, Span, Stmt, StmtKind};
5
6impl Compiler {
7 pub fn infer_expr(&mut self, expr: &Expr) -> Result<Type> {
8 match &expr.kind {
9 ExprKind::Value(Dynamic::Null) => Ok(Type::Any),
10 ExprKind::Value(v) => Ok(v.get_type()),
11 ExprKind::Var(idx) => {
12 let idx = self.top() + (*idx as usize);
13 if idx < self.tys.len() { self.symbols.get_type(&self.tys[idx]) } else { Ok(Type::Any) }
14 }
15 ExprKind::Id(id, _) => match self.symbols.get_symbol(*id)?.1 {
16 Symbol::Const { ty, .. } => Ok(ty.clone()),
17 Symbol::Static { ty, .. } => Ok(ty.clone()),
18 Symbol::Struct(ty, _) => Ok(ty.clone()),
19 Symbol::Fn { .. } => Ok(Type::Symbol { id: *id, params: Vec::new() }),
20 Symbol::Native(ty) => Ok(ty.clone()),
21 s => Err(Self::semantic_error(expr.span, format!("符号 {:?} 不是变量、常量、静态变量、结构体", s))),
22 },
23 ExprKind::AssocId { id, params } => Ok(Type::Symbol { id: *id, params: params.clone() }),
24 ExprKind::Unary { value, .. } => self.infer_expr(value.as_ref()),
25 ExprKind::Binary { left, op, right } => {
26 let assign_idx = if op.is_assign() { if let ExprKind::Var(idx) = &left.kind { Some(*idx) } else { None } } else { None };
27 let ty = if op.is_logic() {
28 let left_ty = self.infer_expr(left)?;
29 if matches!(op, BinaryOp::And | BinaryOp::Or) && left_ty.is_any() { Type::Any } else { Type::Bool }
30 } else if op == &BinaryOp::Idx {
31 let left_ty = self.infer_expr(left)?;
32 if let Type::Array(elem_ty, _) = left_ty {
33 (*elem_ty).clone()
34 } else if let Type::Vec(elem_ty, _) = left_ty {
35 (*elem_ty).clone()
36 } else {
37 let left_ty = self.symbols.get_type(&left_ty)?;
38 let right_ty = if right.is_value() || right.is_const() {
39 let right_value = if let ExprKind::Const(c) = &right.kind { self.consts[*c].clone() } else { right.clone().value()? };
40 if right_value.is_str() {
41 if let Ok(field) = self.symbols.get_field(&left_ty, right_value.as_str()) {
42 return if let Type::Fn { ret, .. } = field.1 { Ok(ret.as_ref().clone()) } else { Ok(field.1.clone()) };
43 }
44 } else if let Type::Struct { fields, .. } = &left_ty
45 && let Some(idx) = right_value.as_int()
46 {
47 return fields.get(idx as usize).map(|(_, ty)| ty.clone()).ok_or_else(|| Self::semantic_error(right.span, format!("结构字段索引越界 {}", idx)));
48 }
49 right_value.get_type()
50 } else {
51 self.infer_expr(right)?
52 };
53 if right_ty.is_int() || right_ty.is_uint() {
54 if left_ty.is_any() {
55 return Ok(Type::Any);
56 }
57 let (_, s) = self.symbols.get_field(&left_ty, "get_idx")?;
58 let fn_ty = self.symbols.get_type(&s)?;
59 return if let Type::Fn { ret, .. } = &fn_ty { Ok(ret.as_ref().clone()) } else { Ok(fn_ty) };
60 }
61 if left_ty.is_any() {
62 return Ok(Type::Any);
63 }
64 Type::Any
65 }
66 } else {
67 let right_ty = self.infer_expr(right)?;
68 if op == &BinaryOp::Assign { right_ty } else { self.infer_expr(left)? + right_ty }
69 };
70 assign_idx.map(|idx| self.set_ty(idx, ty.clone()));
71 Ok(ty)
72 }
73 ExprKind::Call { obj, params } => {
74 if let ExprKind::AssocId { id, params: generic_args } = &obj.kind {
75 let mut args = Vec::new();
76 for p in params {
77 args.push(self.infer_expr(p)?);
78 }
79 self.infer_fn_with_params(*id, &args, generic_args)
80 } else if let ExprKind::Id(id, obj_expr) = &obj.kind {
81 let mut args: Vec<Type> = if let Some(obj) = obj_expr { vec![self.infer_expr(obj)?] } else { Vec::new() };
82 for p in params {
83 args.push(self.infer_expr(p)?);
84 }
85 self.infer_fn(*id, &args)
86 } else if obj.is_idx() {
87 let (target, _, method) = obj.clone().binary().unwrap();
88 let ty = self.infer_expr(&target)?;
89 if let Some(method) = self.get_value(&method) {
90 let method = method.as_str();
91 let fn_ty = match self.get_field(&ty, method) {
92 Ok((_, fn_ty)) => fn_ty,
93 Err(_) => {
94 let id = self.symbols.get_id(method)?;
95 if self.symbols.get_symbol(id)?.1.is_fn() {
96 Type::Symbol { id, params: Vec::new() }
97 } else {
98 return Err(Self::semantic_error(obj.span, format!("符号 {method} 不是函数")));
99 }
100 }
101 };
102 if let Type::Symbol { id, .. } = fn_ty {
103 let mut args = vec![ty];
104 for p in params {
105 args.push(self.infer_expr(p)?);
106 }
107 self.infer_fn(id, &args)
108 } else {
109 Ok(fn_ty)
110 }
111 } else {
112 Ok(Type::Any)
113 }
114 } else if let ExprKind::Var(idx) = &obj.kind {
115 let idx = self.top() + (*idx as usize);
116 if idx < self.tys.len()
117 && let Type::Symbol { id, .. } = self.tys[idx]
118 {
119 let mut args = Vec::new();
120 for p in params {
121 args.push(self.infer_expr(p)?);
122 }
123 self.infer_fn(id, &args)
124 } else {
125 Ok(Type::Any)
126 }
127 } else if obj.is_value() {
128 Ok(Type::Void)
129 } else {
130 Ok(Type::Any)
131 }
132 }
133 ExprKind::Typed { ty, .. } => Ok(ty.clone()),
134 ExprKind::Stmt(stmt) => self.infer_stmt(stmt),
135 ExprKind::Range { start, stop, .. } => {
136 let start_ty = self.infer_expr(start)?;
137 let stop_ty = self.infer_expr(stop)?;
138 Ok(if start_ty.is_any() {
139 stop_ty
140 } else if stop_ty.is_any() {
141 start_ty
142 } else {
143 stop_ty
144 })
145 }
146 _ => Ok(Type::Any),
147 }
148 }
149
150 fn get_fn_tys(&mut self, tys: &[Type], arg_tys: &[Type]) -> Result<Vec<Type>> {
151 let mut fn_tys = Vec::new();
152 for (i, ty) in tys.iter().enumerate() {
153 if !ty.is_any() {
154 fn_tys.push(ty.clone());
155 } else if let Some(arg_ty) = arg_tys.get(i) {
156 fn_tys.push(self.symbols.get_type(arg_ty)?);
157 } else {
158 fn_tys.push(Type::Any);
159 }
160 }
161 Ok(fn_tys)
162 }
163
164 pub fn infer_fn(&mut self, id: u32, arg_tys: &[Type]) -> Result<Type> {
165 self.infer_fn_with_params(id, arg_tys, &[])
166 }
167
168 pub fn infer_fn_with_params(&mut self, id: u32, arg_tys: &[Type], generic_args: &[Type]) -> Result<Type> {
169 let (name, s) = self.symbols.get_symbol(id).map(|(n, s)| (n.clone(), s.clone()))?;
170 if let Symbol::Fn { ty, args, generic_params, cap, body, .. } = s {
171 if let Type::Fn { tys, ret: _ } = ty {
172 let inferred_generic_args = if generic_args.is_empty() { crate::infer_generic_args_from_types(&generic_params, &tys, arg_tys) } else { generic_args.to_vec() };
173 let generic_args = if generic_params.is_empty() { &[] } else { inferred_generic_args.as_slice() };
174 let tys = if generic_params.is_empty() { tys } else { tys.iter().map(|ty| crate::substitute_type(ty, &generic_params, generic_args)).collect() };
175 let body = if generic_params.is_empty() { body.as_ref().clone() } else { crate::substitute_stmt(body.as_ref(), &generic_params, generic_args) };
176 let fn_tys = self.get_fn_tys(&tys, arg_tys)?;
177 let body = if generic_params.is_empty() {
178 body
179 } else {
180 let mut compile_tys = tys.clone();
181 let mut compile_cap = cap.clone();
182 let saved_state = self.take_local_state();
183 let compiled = self.compile_fn(&args, &mut compile_tys, body, &mut compile_cap);
184 self.restore_local_state(saved_state);
185 Stmt::new(StmtKind::Block(compiled?), Span::default())
186 };
187 if let Some(fns) = self.fns.get_mut(&id) {
188 for f in fns.iter() {
189 if f.0 == generic_args && f.1 == fn_tys {
190 return Ok(f.2.clone());
191 }
192 }
193 fns.push((generic_args.to_vec(), fn_tys.clone(), Type::Any));
194 } else {
195 self.fns.insert(id, vec![(generic_args.to_vec(), fn_tys.clone(), Type::Any)]);
196 }
197 let top = self.tys.len();
198 self.tys.append(&mut fn_tys.clone());
199 for c in cap.vars.iter() {
200 self.tys.push(self.tys[self.top() + *c].clone());
201 }
202 self.frames.push(top);
203 let ret_ty = self.infer_stmt(&body);
204 if let Some(top) = self.frames.pop() {
205 self.tys.truncate(top);
206 }
207 let ret_ty = match ret_ty {
208 Ok(ret_ty) => ret_ty,
209 Err(err) => {
210 log::error!("infer_fn {} failed: {:?}", name, err);
211 let should_remove = self
212 .fns
213 .get_mut(&id)
214 .map(|fns| {
215 fns.retain(|item| item.0 != generic_args || item.1 != fn_tys || item.2 != Type::Any);
216 fns.is_empty()
217 })
218 .unwrap_or(false);
219 if should_remove {
220 self.fns.remove(&id);
221 }
222 return Err(err);
223 }
224 };
225 self.fns.get_mut(&id).map(|f| {
226 f.iter_mut().find(|item| item.0 == generic_args && item.1 == fn_tys).map(|item| item.2 = ret_ty.clone());
227 });
228 Ok(ret_ty)
229 } else {
230 Ok(Type::Any)
231 }
232 } else if let Symbol::Native(f) = s {
233 if let Type::Fn { ret, .. } = f { Ok((*ret).clone()) } else { Ok(Type::Any) }
234 } else if matches!(s, Symbol::Null) {
235 Ok(Type::Any)
236 } else {
237 Err(Self::semantic_error(Span::default(), format!("符号 {:?} 不是函数", name)))
238 }
239 }
240
241 pub fn infer_stmt(&mut self, stmt: &Stmt) -> Result<Type> {
242 match &stmt.kind {
243 StmtKind::Expr(expr, close) => {
244 if !close {
245 self.infer_expr(expr)
246 } else {
247 self.infer_expr(expr)?;
248 Ok(Type::Void)
249 }
250 }
251 StmtKind::Return(expr) => {
252 if let Some(e) = expr {
253 self.infer_expr(e)
254 } else {
255 Ok(Type::Void)
256 }
257 }
258 StmtKind::Block(stmts) => {
259 for (idx, stmt) in stmts.iter().enumerate() {
260 let ty = self.infer_stmt(stmt)?;
261 if stmt.is_return() || idx == stmts.len() - 1 {
262 return Ok(ty);
263 }
264 }
265 Ok(Type::Void)
266 }
267 StmtKind::If { then_body, else_body, .. } => {
268 let then_ty = self.infer_stmt(then_body)?;
269 if let Some(e) = else_body {
270 let else_ty = self.infer_stmt(e)?;
271 if then_ty != else_ty {
272 log::info!("then 和 else 有不同类型 {:?} {:?}", then_ty, else_ty);
273 return Ok(if then_ty.is_any() { else_ty } else { then_ty });
274 }
275 }
276 if else_body.is_none() {
277 return Ok(Type::Void);
278 }
279 Ok(then_ty)
280 }
281 StmtKind::While { cond, body } => {
282 let cond_ty = self.infer_expr(cond)?;
283 if cond_ty != Type::Bool {
284 return Err(Self::semantic_error(cond.span, "条件表达式必须是布尔类型"));
285 }
286 self.infer_stmt(body)
287 }
288 StmtKind::For { pat, range, body } => {
289 if let PatternKind::Var { idx, .. } = &pat.kind {
290 let ty = self.infer_expr(range)?;
291 self.set_ty(*idx, ty);
292 } else if let PatternKind::Tuple(pats) = &pat.kind {
293 let ty = self.infer_expr(range)?;
294 assert!(ty.is_any());
295 for pat in pats {
296 if let Some(idx) = pat.var() {
297 self.set_ty(idx, Type::Any);
298 }
299 }
300 }
301 self.infer_stmt(body)
302 }
303 StmtKind::Let { pat, value } => {
304 let expr_ty = if let StmtKind::Expr(expr, _) = &value.kind { self.infer_expr(expr)? } else { self.infer_stmt(value)? };
305 if let PatternKind::Ident { ty, .. } = &pat.kind {
306 let annotated_ty = self.symbols.get_type(ty)?;
307 if annotated_ty.is_any() {
308 self.add_ty(expr_ty);
309 } else {
310 self.add_ty(annotated_ty);
311 }
312 } else if let PatternKind::Var { idx, .. } = &pat.kind {
313 self.set_ty(*idx, expr_ty);
314 } else if matches!(pat.kind, PatternKind::Wildcard) {
315 self.add_ty(expr_ty);
316 }
317 Ok(Type::Void)
318 }
319 _ => Ok(Type::Void),
320 }
321 }
322}