forked from csaroff/MiniJava-Compiler
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathTypeChecker.java
More file actions
281 lines (270 loc) · 13.3 KB
/
Copy pathTypeChecker.java
File metadata and controls
281 lines (270 loc) · 13.3 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.misc.NotNull;
import org.antlr.v4.runtime.tree.ErrorNode;
import org.antlr.v4.runtime.tree.TerminalNode;
import org.antlr.v4.runtime.Token;
import org.antlr.v4.runtime.tree.ParseTreeProperty;
import org.antlr.v4.runtime.tree.RuleNode;
import org.antlr.v4.runtime.tree.ParseTree;
import java.util.*;
public class TypeChecker extends MinijavaBaseVisitor<Klass> {
final Map<String, Klass> klasses;
ParseTreeProperty<Scope> scopes;
Scope currentScope;
ParseTreeProperty<Klass> callerTypes;
MinijavaParser parser;
Klass INT;
Klass INTARRAY;
Klass BOOLEAN;
public TypeChecker(final Map<String, Klass> klasses, ParseTreeProperty<Scope> scopes, ParseTreeProperty<Klass> callerTypes, MinijavaParser parser){
INT = klasses.get("int");
this.klasses = klasses;
this.scopes=scopes;
this.callerTypes = callerTypes;
INT = klasses.get("int");
INTARRAY = klasses.get("int[]");
BOOLEAN = klasses.get("boolean");
this.parser=parser;
}
@Override public Klass visitMainClass(@NotNull MinijavaParser.MainClassContext ctx){
return scopingCall(ctx);
}
@Override public Klass visitClassDeclaration(@NotNull MinijavaParser.ClassDeclarationContext ctx) {
return scopingCall(ctx);
}
@Override public Klass visitMethodDeclaration(@NotNull MinijavaParser.MethodDeclarationContext ctx) {
currentScope = scopes.get(ctx);
Klass originalKlass = ((Klass)(currentScope.getEnclosingScope())).getSuperKlass();
Method originalMethod;
if(originalKlass==null){ originalMethod=null; }
else{ originalMethod=(Method)originalKlass.lookup(currentScope.getScopeName());}
Method currentMethod = (Method)currentScope;
Klass currentKlass = (Klass)currentMethod.getEnclosingScope();
if(originalMethod!=null && originalMethod.getType() != currentMethod.getType()){
ErrorPrinter.printIncompatibleReturnTypeError(parser, ctx.Identifier().getSymbol(), originalKlass, currentKlass, originalMethod, currentMethod);
}
Klass result = visitChildren(ctx);
currentScope = currentScope.getEnclosingScope();
return null;
}
@Override public Klass visitMethodBody(@NotNull MinijavaParser.MethodBodyContext ctx) {
//The return type type-check is working correctly with inheritence.
for(MinijavaParser.LocalDeclarationContext pCtx : ctx.localDeclaration()){visit(pCtx);}
for(MinijavaParser.StatementContext pCtx : ctx.statement()){visit(pCtx);}
Klass formalReturnType = Scope.getEnclosingMethod(currentScope).getType();
Klass actualReturnType = visit(ctx.expression());
if(actualReturnType!=null && !actualReturnType.isInstanceOf(formalReturnType)){
ErrorPrinter.printRequiredFoundError(
"error: incompatible types.", parser, ctx.RETURN().getSymbol(), formalReturnType.toString(), actualReturnType.toString());
}
return null;
}
@Override public Klass visitType(@NotNull MinijavaParser.TypeContext ctx) {
//Correctly reported error during variable intialization test with non-existent class.
if(ctx.Identifier()!=null){//it is a reference type
String name = ctx.Identifier().getSymbol().getText();
Klass var = klasses.get(name);
if(var==null){
ErrorPrinter.printUnresolvedSymbolError(parser, ctx.Identifier().getSymbol(), "class", Scope.getEnclosingKlass(currentScope));
}
return var;
}
return null;
}
@Override public Klass visitIfElseStatement(@NotNull MinijavaParser.IfElseStatementContext ctx) {
//Correctly reported error with int instead of boolean.
Klass booleanExpression = visit(ctx.expression());
visit(ctx.ifBlock());
visit(ctx.elseBlock());
if(booleanExpression!=BOOLEAN){
ErrorPrinter.printRequiredFoundError(
"error: incompatible types.", parser, ctx.LP().getSymbol(), BOOLEAN.toString(), booleanExpression.toString());
}
return null;
}
@Override public Klass visitWhileStatement(@NotNull MinijavaParser.WhileStatementContext ctx) {
//Correctly reported error with int instead of boolean.
Klass booleanExpression = visit(ctx.expression());
visit(ctx.whileBlock());
if(booleanExpression!=BOOLEAN){
ErrorPrinter.printRequiredFoundError(
"error: incompatible types.", parser, ctx.LP().getSymbol(), BOOLEAN.toString(), booleanExpression.toString());
}
return null;
}
@Override public Klass visitPrintStatement(@NotNull MinijavaParser.PrintStatementContext ctx) {
//Correctly reported error of boolean instead of int.
Klass printContents = visit(ctx.expression());
if(printContents!=null && printContents!=INT){
ErrorPrinter.printRequiredFoundError(
"error: incompatible types.", parser, ctx.LP().getSymbol(), INT.toString(), printContents.toString());
}
return null;
}
@Override public Klass visitVariableAssignmentStatement(MinijavaParser.VariableAssignmentStatementContext ctx){
//correctly reported errors in all cases.
String name = ctx.Identifier().getSymbol().getText();
Symbol var = currentScope.lookup(name);
Klass rightSide = visit(ctx.expression());
if ( var==null ) {
ErrorPrinter.printUnresolvedSymbolError(parser, ctx.Identifier().getSymbol(), "variable", Scope.getEnclosingKlass(currentScope));
}else if(rightSide!=null && !rightSide.isInstanceOf(var.getType())){
ErrorPrinter.printRequiredFoundError("error: incompatible types.", parser, ctx.Identifier().getSymbol(), var.getType().toString(), (rightSide.toString()));
}
return null;
}
@Override public Klass visitArrayAssignmentStatement(@NotNull MinijavaParser.ArrayAssignmentStatementContext ctx) {
//correctly reported errors in all cases
//ErrorPrinter.printFileNameAndLineNumber(ctx.Identifier().getSymbol());
String name = ctx.Identifier().getSymbol().getText();
Symbol var = currentScope.lookup(name);
Klass index = visit(ctx.expression(0));
Klass rightSide = visit(ctx.expression(1));
if ( var==null ) {
ErrorPrinter.printUnresolvedSymbolError(parser, ctx.Identifier().getSymbol(), "variable", Scope.getEnclosingKlass(currentScope));
}else if(var.getType()!=INTARRAY){
ErrorPrinter.printRequiredFoundError("error: incompatible types.", parser, ctx.LSB().getSymbol(), INTARRAY.toString(), (var.getType().toString()));
}else if(rightSide!=null && INT!=rightSide){
ErrorPrinter.printRequiredFoundError("error: incompatible types.", parser, ctx.EQ().getSymbol(), INT.toString(), (rightSide.toString()));
}else if(index!=INT){
ErrorPrinter.printRequiredFoundError("error: incompatible types.", parser, ctx.LSB().getSymbol(), INT.toString(), index.toString());
}
return null;
}
@Override public Klass visitAndExpression(@NotNull MinijavaParser.AndExpressionContext ctx) {
ErrorPrinter.binaryOperatorTypeError(parser, ctx, ctx.AND().getSymbol(), visit(ctx.expression(0)), visit(ctx.expression(1)), BOOLEAN, BOOLEAN);
return BOOLEAN;
}
@Override public Klass visitLtExpression(@NotNull MinijavaParser.LtExpressionContext ctx) {
ErrorPrinter.binaryOperatorTypeError(parser, ctx, ctx.LT().getSymbol(), visit(ctx.expression(0)), visit(ctx.expression(1)), INT, INT);
return BOOLEAN;
}
@Override public Klass visitAddExpression(@NotNull MinijavaParser.AddExpressionContext ctx) {
ErrorPrinter.binaryOperatorTypeError(parser, ctx, ctx.PLUS().getSymbol(), visit(ctx.expression(0)), visit(ctx.expression(1)), INT, INT);
return INT;
}
@Override public Klass visitSubExpression(@NotNull MinijavaParser.SubExpressionContext ctx) {
ErrorPrinter.binaryOperatorTypeError(parser, ctx, ctx.MINUS().getSymbol(), visit(ctx.expression(0)), visit(ctx.expression(1)), INT, INT);
return INT;
}
@Override public Klass visitMulExpression(@NotNull MinijavaParser.MulExpressionContext ctx) {
ErrorPrinter.binaryOperatorTypeError(parser, ctx, ctx.TIMES().getSymbol(), visit(ctx.expression(0)), visit(ctx.expression(1)), INT, INT);
return INT;
}
@Override public Klass visitPowExpression(@NotNull MinijavaParser.PowExpressionContext ctx) {
//Error reporting test successful.
ErrorPrinter.binaryOperatorTypeError(parser, ctx, ctx.POWER().getSymbol(), visit(ctx.expression(0)), visit(ctx.expression(1)), INT, INT);
return INT;
}
@Override public Klass visitArrayAccessExpression(@NotNull MinijavaParser.ArrayAccessExpressionContext ctx) {
//Error reporting test successful.
Klass array = visit(ctx.expression(0));
Klass index = visit(ctx.expression(1));
if(array!=INTARRAY){
ErrorPrinter.printFileNameAndLineNumber(ctx.LSB().getSymbol());
System.err.println("error: array required, but " + array + " found");
ErrorPrinter.underlineError(parser, ctx.LSB().getSymbol());
}
if(index!=INT){
ErrorPrinter.printRequiredFoundError("error: incompatible type.", parser, ctx.LSB().getSymbol(), INT.toString(), index.toString());
}
return INT;
}
@Override public Klass visitArrayLengthExpression(@NotNull MinijavaParser.ArrayLengthExpressionContext ctx) {
Klass intArr = visit(ctx.expression());
if(intArr!=INTARRAY){
ErrorPrinter.printFileNameAndLineNumber(ctx.DOTLENGTH().getSymbol());
System.err.println("error: bad operand type " + intArr + " for unary operator '.length'");
ErrorPrinter.underlineError(parser, ctx.DOTLENGTH().getSymbol());
}
return INT;
}
@Override public Klass visitMethodCallExpression(@NotNull MinijavaParser.MethodCallExpressionContext ctx) {
Klass type = visit(ctx.expression(0));
callerTypes.put(ctx, type);
if(type==null){
return null;
}
String methodName = ctx.Identifier().getText() +"()";
Method method = (Method)(type.lookup(methodName));
if (method==null ) {
ErrorPrinter.printUnresolvedSymbolError(parser, ctx.Identifier().getSymbol(), "method", type);
return null;
}else{
List<Klass> parameterList = new ArrayList<Klass>();
for(MinijavaParser.ExpressionContext expCtx : ctx.expression().subList(1, ctx.expression().size())){
parameterList.add(visit(expCtx));
}
List<Klass> parameterListDefinition = method.getParameterListDefinition();
if(parameterListDefinition.size()!=parameterList.size()){
ErrorPrinter.printRequiredFoundError(
"error: method call parameters of method " + method.getName() + " do not match method definition.",
parser, ctx.Identifier().getSymbol(), parameterListDefinition.toString(), parameterList.toString());
System.err.println("reason: actual and formal argument lists differ in length.");
return method.getType();
}
for(int i=0; i<parameterListDefinition.size(); i++){
if(!parameterList.get(i).isInstanceOf(parameterListDefinition.get(i))){
ErrorPrinter.printRequiredFoundError(
"error: method call parameters of method " + method.getName() + " do not match method definition.",
parser, ctx.Identifier().getSymbol(), parameterListDefinition.toString(), parameterList.toString());
}
}
return method.getType();
}
}
@Override public Klass visitIntLitExpression(@NotNull MinijavaParser.IntLitExpressionContext ctx) {
visitChildren(ctx);
return INT;
}
@Override public Klass visitBooleanLitExpression(@NotNull MinijavaParser.BooleanLitExpressionContext ctx) {
visitChildren(ctx);
return BOOLEAN;
}
@Override public Klass visitIdentifierExpression(@NotNull MinijavaParser.IdentifierExpressionContext ctx) {
String name = ctx.Identifier().getSymbol().getText();
Symbol var = currentScope.lookup(name);
if ( var==null ){
ErrorPrinter.printUnresolvedSymbolError(parser, ctx.Identifier().getSymbol(), "variable", Scope.getEnclosingKlass(currentScope));
return null;
}
return var.getType();
}
@Override public Klass visitThisExpression(@NotNull MinijavaParser.ThisExpressionContext ctx) {
visitChildren(ctx);
return Scope.getEnclosingKlass(currentScope);
}
@Override public Klass visitArrayInstantiationExpression(@NotNull MinijavaParser.ArrayInstantiationExpressionContext ctx) {
Klass type = visit(ctx.expression());
if(type!=INT){
ErrorPrinter.printRequiredFoundError("error: incompatible types.", parser, ctx.LSB().getSymbol(), INT.toString(), type.toString());
}
return INTARRAY;
}
@Override public Klass visitObjectInstantiationExpression(@NotNull MinijavaParser.ObjectInstantiationExpressionContext ctx) {
Klass type = klasses.get(ctx.Identifier().getText());
if ( type==null ){
ErrorPrinter.printUnresolvedSymbolError(parser, ctx.Identifier().getSymbol(), "class", Scope.getEnclosingKlass(currentScope));
}
return type;
}
@Override public Klass visitNotExpression(@NotNull MinijavaParser.NotExpressionContext ctx) {
Klass bool = visit(ctx.expression());
if(bool!=BOOLEAN){
ErrorPrinter.printFileNameAndLineNumber(ctx.NOT().getSymbol());
System.err.println("error: bad operand type " + bool + " for unary operator '!'");
ErrorPrinter.underlineError(parser, ctx.NOT().getSymbol());
}
return BOOLEAN;
}
@Override public Klass visitParenExpression(@NotNull MinijavaParser.ParenExpressionContext ctx) {
return visit(ctx.expression());
}
//----------------------------------------------------------------------
public Klass scopingCall(ParserRuleContext ctx){
currentScope = scopes.get(ctx);
Klass result = visitChildren(ctx);
currentScope = currentScope.getEnclosingScope();
return null;
}
}