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Type Checking 

Completed type checking as well as formatted files.
master
Joshua Potter 2014-03-22 21:01:40 -04:00
parent 83c72019f5
commit 3517e9648c
61 changed files with 2046 additions and 1807 deletions
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4
miniJava/src/miniJava/AbstractSyntaxTrees/AST.java
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@ -9,7 +9,7 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public abstract class AST {
public AST (SourcePosition posn) {
public AST(SourcePosition posn) {
this.posn = posn;
}
@ -21,7 +21,7 @@ public abstract class AST {
return cn;
}
public abstract <A,R> R visit(Visitor<A,R> v, A o);
public abstract <A, R> R visit(Visitor<A, R> v, A o);
public SourcePosition posn;
}

163
miniJava/src/miniJava/AbstractSyntaxTrees/ASTDisplay.java
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@ -16,15 +16,17 @@ package miniJava.AbstractSyntaxTrees;
*
* implements Visitor<argtype,resulttype>
*/
public class ASTDisplay implements Visitor<String,Object> {
public class ASTDisplay implements Visitor<String, Object> {
public static boolean showPosition = false;
/**
* print text representation of AST to stdout
* @param ast root node of AST
*
* @param ast
* root node of AST
*/
public void showTree(AST ast){
public void showTree(AST ast) {
System.out.println("======= AST Display =========================");
ast.visit(this, "");
System.out.println("=============================================");
@ -34,8 +36,11 @@ public class ASTDisplay implements Visitor<String,Object> {
/**
* display arbitrary text for a node
* @param prefix spacing to indicate depth in AST
* @param text preformatted node display
*
* @param prefix
* spacing to indicate depth in AST
* @param text
* preformatted node display
*/
private void show(String prefix, String text) {
System.out.println(prefix + text);
@ -43,8 +48,11 @@ public class ASTDisplay implements Visitor<String,Object> {
/**
* display AST node by name
* @param prefix spacing to indicate depth in AST
* @param node AST node, will be shown by name
*
* @param prefix
* spacing to indicate depth in AST
* @param node
* AST node, will be shown by name
*/
private void show(String prefix, AST node) {
System.out.println(prefix + node.toString());
@ -52,7 +60,9 @@ public class ASTDisplay implements Visitor<String,Object> {
/**
* quote a string
* @param text string to quote
*
* @param text
* string to quote
*/
private String quote(String text) {
return ("\"" + text + "\"");
@ -60,73 +70,73 @@ public class ASTDisplay implements Visitor<String,Object> {
/**
* increase depth in AST
* @param prefix current spacing to indicate depth in AST
*
* @param prefix
* current spacing to indicate depth in AST
* @return new spacing
*/
private String indent(String prefix) {
return prefix + " ";
}
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
//
// PACKAGE
//
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
public Object visitPackage(Package prog, String arg){
public Object visitPackage(Package prog, String arg) {
show(arg, prog);
ClassDeclList cl = prog.classDeclList;
show(arg," ClassDeclList [" + cl.size() + "]");
show(arg, " ClassDeclList [" + cl.size() + "]");
String pfx = arg + " . ";
for (ClassDecl c: prog.classDeclList){
for (ClassDecl c : prog.classDeclList) {
c.visit(this, pfx);
}
return null;
}
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
//
// DECLARATIONS
//
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
public Object visitClassDecl(ClassDecl clas, String arg){
public Object visitClassDecl(ClassDecl clas, String arg) {
show(arg, clas);
show(indent(arg), quote(clas.name) + " classname");
show(arg," FieldDeclList [" + clas.fieldDeclList.size() + "]");
show(arg, " FieldDeclList [" + clas.fieldDeclList.size() + "]");
String pfx = arg + " . ";
for (FieldDecl f: clas.fieldDeclList)
for (FieldDecl f : clas.fieldDeclList)
f.visit(this, pfx);
show(arg," MethodDeclList [" + clas.methodDeclList.size() + "]");
for (MethodDecl m: clas.methodDeclList)
show(arg, " MethodDeclList [" + clas.methodDeclList.size() + "]");
for (MethodDecl m : clas.methodDeclList)
m.visit(this, pfx);
return null;
}
public Object visitFieldDecl(FieldDecl f, String arg){
show(arg, "(" + (f.isPrivate ? "private": "public")
+ (f.isStatic ? " static) " :") ") + f.toString());
public Object visitFieldDecl(FieldDecl f, String arg) {
show(arg, "(" + (f.isPrivate ? "private" : "public")
+ (f.isStatic ? " static) " : ") ") + f.toString());
f.type.visit(this, indent(arg));
show(indent(arg), quote(f.name) + " fieldname");
return null;
}
public Object visitMethodDecl(MethodDecl m, String arg){
show(arg, "(" + (m.isPrivate ? "private": "public")
+ (m.isStatic ? " static) " :") ") + m.toString());
public Object visitMethodDecl(MethodDecl m, String arg) {
show(arg, "(" + (m.isPrivate ? "private" : "public")
+ (m.isStatic ? " static) " : ") ") + m.toString());
m.type.visit(this, indent(arg));
show(indent(arg), quote(m.name) + " methodname");
ParameterDeclList pdl = m.parameterDeclList;
show(arg, " ParameterDeclList [" + pdl.size() + "]");
String pfx = ((String) arg) + " . ";
for (ParameterDecl pd: pdl) {
for (ParameterDecl pd : pdl) {
pd.visit(this, pfx);
}
StatementList sl = m.statementList;
show(arg, " StmtList [" + sl.size() + "]");
for (Statement s: sl) {
for (Statement s : sl) {
s.visit(this, pfx);
}
if (m.returnExp != null) {
@ -135,90 +145,88 @@ public class ASTDisplay implements Visitor<String,Object> {
return null;
}
public Object visitParameterDecl(ParameterDecl pd, String arg){
public Object visitParameterDecl(ParameterDecl pd, String arg) {
show(arg, pd);
pd.type.visit(this, indent(arg));
show(indent(arg), quote(pd.name) + "parametername ");
return null;
}
public Object visitVarDecl(VarDecl vd, String arg){
public Object visitVarDecl(VarDecl vd, String arg) {
show(arg, vd);
vd.type.visit(this, indent(arg));
show(indent(arg), quote(vd.name) + " varname");
return null;
}
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
//
// TYPES
//
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
public Object visitBaseType(BaseType type, String arg){
public Object visitBaseType(BaseType type, String arg) {
show(arg, type.typeKind + " " + type.toString());
return null;
}
public Object visitClassType(ClassType type, String arg){
public Object visitClassType(ClassType type, String arg) {
show(arg, type);
show(indent(arg), quote(type.className.spelling) + " classname");
return null;
}
public Object visitArrayType(ArrayType type, String arg){
public Object visitArrayType(ArrayType type, String arg) {
show(arg, type);
type.eltType.visit(this, indent(arg));
return null;
}
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
//
// STATEMENTS
//
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
public Object visitBlockStmt(BlockStmt stmt, String arg){
public Object visitBlockStmt(BlockStmt stmt, String arg) {
show(arg, stmt);
StatementList sl = stmt.sl;
show(arg," StatementList [" + sl.size() + "]");
show(arg, " StatementList [" + sl.size() + "]");
String pfx = arg + " . ";
for (Statement s: sl) {
for (Statement s : sl) {
s.visit(this, pfx);
}
return null;
}
public Object visitVardeclStmt(VarDeclStmt stmt, String arg){
public Object visitVardeclStmt(VarDeclStmt stmt, String arg) {
show(arg, stmt);
stmt.varDecl.visit(this, indent(arg));
stmt.initExp.visit(this, indent(arg));
return null;
}
public Object visitAssignStmt(AssignStmt stmt, String arg){
show(arg,stmt);
public Object visitAssignStmt(AssignStmt stmt, String arg) {
show(arg, stmt);
stmt.ref.visit(this, indent(arg));
stmt.val.visit(this, indent(arg));
return null;
}
public Object visitCallStmt(CallStmt stmt, String arg){
show(arg,stmt);
public Object visitCallStmt(CallStmt stmt, String arg) {
show(arg, stmt);
stmt.methodRef.visit(this, indent(arg));
ExprList al = stmt.argList;
show(arg," ExprList [" + al.size() + "]");
show(arg, " ExprList [" + al.size() + "]");
String pfx = arg + " . ";
for (Expression e: al) {
for (Expression e : al) {
e.visit(this, pfx);
}
return null;
}
public Object visitIfStmt(IfStmt stmt, String arg){
show(arg,stmt);
public Object visitIfStmt(IfStmt stmt, String arg) {
show(arg, stmt);
stmt.cond.visit(this, indent(arg));
stmt.thenStmt.visit(this, indent(arg));
if (stmt.elseStmt != null)
@ -226,28 +234,27 @@ public class ASTDisplay implements Visitor<String,Object> {
return null;
}
public Object visitWhileStmt(WhileStmt stmt, String arg){
public Object visitWhileStmt(WhileStmt stmt, String arg) {
show(arg, stmt);
stmt.cond.visit(this, indent(arg));
stmt.body.visit(this, indent(arg));
return null;
}
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
//
// EXPRESSIONS
//
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
public Object visitUnaryExpr(UnaryExpr expr, String arg){
public Object visitUnaryExpr(UnaryExpr expr, String arg) {
show(arg, expr);
expr.operator.visit(this, indent(arg));
expr.expr.visit(this, indent(indent(arg)));
return null;
}
public Object visitBinaryExpr(BinaryExpr expr, String arg){
public Object visitBinaryExpr(BinaryExpr expr, String arg) {
show(arg, expr);
expr.operator.visit(this, indent(arg));
expr.left.visit(this, indent(indent(arg)));
@ -255,49 +262,48 @@ public class ASTDisplay implements Visitor<String,Object> {
return null;
}
public Object visitRefExpr(RefExpr expr, String arg){
public Object visitRefExpr(RefExpr expr, String arg) {
show(arg, expr);
expr.ref.visit(this, indent(arg));
return null;
}
public Object visitCallExpr(CallExpr expr, String arg){
public Object visitCallExpr(CallExpr expr, String arg) {
show(arg, expr);
expr.functionRef.visit(this, indent(arg));
ExprList al = expr.argList;
show(arg," ExprList + [" + al.size() + "]");
show(arg, " ExprList + [" + al.size() + "]");
String pfx = arg + " . ";
for (Expression e: al) {
for (Expression e : al) {
e.visit(this, pfx);
}
return null;
}
public Object visitLiteralExpr(LiteralExpr expr, String arg){
public Object visitLiteralExpr(LiteralExpr expr, String arg) {
show(arg, expr);
expr.literal.visit(this, indent(arg));
return null;
}
public Object visitNewArrayExpr(NewArrayExpr expr, String arg){
public Object visitNewArrayExpr(NewArrayExpr expr, String arg) {
show(arg, expr);
expr.eltType.visit(this, indent(arg));
expr.sizeExpr.visit(this, indent(arg));
return null;
}
public Object visitNewObjectExpr(NewObjectExpr expr, String arg){
public Object visitNewObjectExpr(NewObjectExpr expr, String arg) {
show(arg, expr);
expr.classtype.visit(this, indent(arg));
return null;
}
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
//
// REFERENCES
//
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
public Object visitQualifiedRef(QualifiedRef qr, String arg) {
show(arg, qr);
@ -314,39 +320,38 @@ public class ASTDisplay implements Visitor<String,Object> {
}
public Object visitIdRef(IdRef ref, String arg) {
show(arg,ref);
show(arg, ref);
ref.id.visit(this, indent(arg));
return null;
}
public Object visitThisRef(ThisRef ref, String arg) {
show(arg,ref);
show(arg, ref);
return null;
}
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
//
// TERMINALS
//
///////////////////////////////////////////////////////////////////////////////
// /////////////////////////////////////////////////////////////////////////////
public Object visitIdentifier(Identifier id, String arg){
public Object visitIdentifier(Identifier id, String arg) {
show(arg, quote(id.spelling) + " " + id.toString());
return null;
}
public Object visitOperator(Operator op, String arg){
public Object visitOperator(Operator op, String arg) {
show(arg, quote(op.spelling) + " " + op.toString());
return null;
}
public Object visitIntLiteral(IntLiteral num, String arg){
public Object visitIntLiteral(IntLiteral num, String arg) {
show(arg, quote(num.spelling) + " " + num.toString());
return null;
}
public Object visitBooleanLiteral(BooleanLiteral bool, String arg){
public Object visitBooleanLiteral(BooleanLiteral bool, String arg) {
show(arg, quote(bool.spelling) + " " + bool.toString());
return null;
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/ArrayType.java
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@ -10,15 +10,14 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public class ArrayType extends Type {
public ArrayType(Type eltType, SourcePosition posn){
public ArrayType(Type eltType, SourcePosition posn) {
super(TypeKind.ARRAY, posn);
this.eltType = eltType;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitArrayType(this, o);
}
public Type eltType;
}
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/AssignStmt.java
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@ -7,15 +7,14 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class AssignStmt extends Statement
{
public AssignStmt(Reference r, Expression e, SourcePosition posn){
public class AssignStmt extends Statement {
public AssignStmt(Reference r, Expression e, SourcePosition posn) {
super(posn);
ref = r;
val = e;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitAssignStmt(this, o);
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/BaseType.java
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@ -7,13 +7,12 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class BaseType extends Type
{
public BaseType(TypeKind t, SourcePosition posn){
public class BaseType extends Type {
public BaseType(TypeKind t, SourcePosition posn) {
super(t, posn);
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitBaseType(this, o);
}
}

8
miniJava/src/miniJava/AbstractSyntaxTrees/BinaryExpr.java
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@ -7,16 +7,16 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class BinaryExpr extends Expression
{
public BinaryExpr(Operator o, Expression e1, Expression e2, SourcePosition posn){
public class BinaryExpr extends Expression {
public BinaryExpr(Operator o, Expression e1, Expression e2,
SourcePosition posn) {
super(posn);
operator = o;
left = e1;
right = e2;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitBinaryExpr(this, o);
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/BlockStmt.java
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@ -7,14 +7,13 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class BlockStmt extends Statement
{
public BlockStmt(StatementList sl, SourcePosition posn){
public class BlockStmt extends Statement {
public BlockStmt(StatementList sl, SourcePosition posn) {
super(posn);
this.sl = sl;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitBlockStmt(this, o);
}

4
miniJava/src/miniJava/AbstractSyntaxTrees/BooleanLiteral.java
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@ -10,10 +10,10 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public class BooleanLiteral extends Literal {
public BooleanLiteral(String spelling, SourcePosition posn) {
super (spelling,posn);
super(spelling, posn);
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitBooleanLiteral(this, o);
}
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/CallExpr.java
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@ -7,15 +7,14 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class CallExpr extends Expression
{
public CallExpr(Reference f, ExprList el, SourcePosition posn){
public class CallExpr extends Expression {
public CallExpr(Reference f, ExprList el, SourcePosition posn) {
super(posn);
functionRef = f;
argList = el;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitCallExpr(this, o);
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/CallStmt.java
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@ -7,15 +7,14 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class CallStmt extends Statement
{
public CallStmt(Reference m, ExprList el, SourcePosition posn){
public class CallStmt extends Statement {
public CallStmt(Reference m, ExprList el, SourcePosition posn) {
super(posn);
methodRef = m;
argList = el;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitCallStmt(this, o);
}

5
miniJava/src/miniJava/AbstractSyntaxTrees/ClassDecl.java
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@ -13,9 +13,12 @@ public class ClassDecl extends Declaration {
super(cn, null, posn);
fieldDeclList = fdl;
methodDeclList = mdl;
Identifier ident = new Identifier(cn, posn);
type = new ClassType(ident, posn);
}
public <A,R> R visit(Visitor<A, R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitClassDecl(this, o);
}

8
miniJava/src/miniJava/AbstractSyntaxTrees/ClassDeclList.java
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@ -7,17 +7,16 @@ package miniJava.AbstractSyntaxTrees;
import java.util.*;
public class ClassDeclList implements Iterable<ClassDecl>
{
public class ClassDeclList implements Iterable<ClassDecl> {
public ClassDeclList() {
classDeclList = new ArrayList<ClassDecl>();
}
public void add(ClassDecl cd){
public void add(ClassDecl cd) {
classDeclList.add(cd);
}
public ClassDecl get(int i){
public ClassDecl get(int i) {
return classDeclList.get(i);
}
@ -31,4 +30,3 @@ public class ClassDeclList implements Iterable<ClassDecl>
private List<ClassDecl> classDeclList;
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/ClassType.java
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@ -7,14 +7,13 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class ClassType extends Type
{
public ClassType(Identifier cn, SourcePosition posn){
public class ClassType extends Type {
public ClassType(Identifier cn, SourcePosition posn) {
super(TypeKind.CLASS, posn);
className = cn;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitClassType(this, o);
}

5
miniJava/src/miniJava/AbstractSyntaxTrees/Declaration.java
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@ -17,8 +17,9 @@ public abstract class Declaration extends AST {
@Override
public String toString() {
if(posn != null) {
return this.name + "(Line: " + posn.line + ", Column: " + posn.col + ")";
if (posn != null) {
return this.name + "(Line: " + posn.line + ", Column: " + posn.col
+ ")";
} else {
return super.toString();
}

3
miniJava/src/miniJava/AbstractSyntaxTrees/Declarators.java
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@ -4,7 +4,8 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public class Declarators {
public Declarators(boolean isPrivate, boolean isStatic, Type mt, SourcePosition posn) {
public Declarators(boolean isPrivate, boolean isStatic, Type mt,
SourcePosition posn) {
this.isPrivate = isPrivate;
this.isStatic = isStatic;
this.mt = mt;

7
miniJava/src/miniJava/AbstractSyntaxTrees/ExprList.java
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@ -7,17 +7,16 @@ package miniJava.AbstractSyntaxTrees;
import java.util.*;
public class ExprList implements Iterable<Expression>
{
public class ExprList implements Iterable<Expression> {
public ExprList() {
elist = new ArrayList<Expression>();
}
public void add(Expression e){
public void add(Expression e) {
elist.add(e);
}
public Expression get(int i){
public Expression get(int i) {
return elist.get(i);
}

2
miniJava/src/miniJava/AbstractSyntaxTrees/Expression.java
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@ -10,7 +10,7 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public abstract class Expression extends AST {
public Expression(SourcePosition posn) {
super (posn);
super(posn);
}
}

6
miniJava/src/miniJava/AbstractSyntaxTrees/FieldDecl.java
View File

@ -9,16 +9,16 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public class FieldDecl extends MemberDecl {
public FieldDecl(boolean isPrivate, boolean isStatic, Type t, String name, SourcePosition posn){
public FieldDecl(boolean isPrivate, boolean isStatic, Type t, String name,
SourcePosition posn) {
super(isPrivate, isStatic, t, name, posn);
}
public FieldDecl(MemberDecl md, SourcePosition posn) {
super(md,posn);
super(md, posn);
}
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitFieldDecl(this, o);
}
}

8
miniJava/src/miniJava/AbstractSyntaxTrees/FieldDeclList.java
View File

@ -7,8 +7,7 @@ package miniJava.AbstractSyntaxTrees;
import java.util.*;
public class FieldDeclList implements Iterable<FieldDecl>
{
public class FieldDeclList implements Iterable<FieldDecl> {
public FieldDeclList() {
fieldDeclList = new ArrayList<FieldDecl>();
}
@ -18,11 +17,11 @@ public class FieldDeclList implements Iterable<FieldDecl>
fieldDeclList.add(f);
}
public void add(FieldDecl cd){
public void add(FieldDecl cd) {
fieldDeclList.add(cd);
}
public FieldDecl get(int i){
public FieldDecl get(int i) {
return fieldDeclList.get(i);
}
@ -36,4 +35,3 @@ public class FieldDeclList implements Iterable<FieldDecl>
private List<FieldDecl> fieldDeclList;
}

4
miniJava/src/miniJava/AbstractSyntaxTrees/IdRef.java
View File

@ -9,12 +9,12 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public class IdRef extends Reference {
public IdRef(Identifier id, SourcePosition posn){
public IdRef(Identifier id, SourcePosition posn) {
super(posn);
this.id = id;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitIdRef(this, o);
}

6
miniJava/src/miniJava/AbstractSyntaxTrees/Identifier.java
View File

@ -9,11 +9,11 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public class Identifier extends Terminal {
public Identifier (String s, SourcePosition posn) {
super (s,posn);
public Identifier(String s, SourcePosition posn) {
super(s, posn);
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitIdentifier(this, o);
}

9
miniJava/src/miniJava/AbstractSyntaxTrees/IfStmt.java
View File

@ -7,23 +7,22 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class IfStmt extends Statement
{
public IfStmt(Expression b, Statement t, Statement e, SourcePosition posn){
public class IfStmt extends Statement {
public IfStmt(Expression b, Statement t, Statement e, SourcePosition posn) {
super(posn);
cond = b;
thenStmt = t;
elseStmt = e;
}
public IfStmt(Expression b, Statement t, SourcePosition posn){
public IfStmt(Expression b, Statement t, SourcePosition posn) {
super(posn);
cond = b;
thenStmt = t;
elseStmt = null;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitIfStmt(this, o);
}

4
miniJava/src/miniJava/AbstractSyntaxTrees/IndexedRef.java
View File

@ -9,13 +9,13 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public class IndexedRef extends Reference {
public IndexedRef(Reference ref, Expression expr, SourcePosition posn){
public IndexedRef(Reference ref, Expression expr, SourcePosition posn) {
super(posn);
this.ref = ref;
this.indexExpr = expr;
}
public <A,R> R visit(Visitor<A,R> v, A o){
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitIndexedRef(this, o);
}

2
miniJava/src/miniJava/AbstractSyntaxTrees/IntLiteral.java
View File

@ -13,7 +13,7 @@ public class IntLiteral extends Literal {
super(s, posn);
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitIntLiteral(this, o);
}
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/LiteralExpr.java
View File

@ -7,14 +7,13 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class LiteralExpr extends Expression
{
public LiteralExpr(Literal c, SourcePosition posn){
public class LiteralExpr extends Expression {
public LiteralExpr(Literal c, SourcePosition posn) {
super(posn);
literal = c;
}
public <A,R> R visit(Visitor<A,R> v, A o){
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitLiteralExpr(this, o);
}

4
miniJava/src/miniJava/AbstractSyntaxTrees/LocalDecl.java
View File

@ -9,8 +9,8 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public abstract class LocalDecl extends Declaration {
public LocalDecl(String name, Type t, SourcePosition posn){
super(name,t,posn);
public LocalDecl(String name, Type t, SourcePosition posn) {
super(name, t, posn);
}
}

5
miniJava/src/miniJava/AbstractSyntaxTrees/MemberDecl.java
View File

@ -9,13 +9,14 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
abstract public class MemberDecl extends Declaration {
public MemberDecl(boolean isPrivate, boolean isStatic, Type mt, String name, SourcePosition posn) {
public MemberDecl(boolean isPrivate, boolean isStatic, Type mt,
String name, SourcePosition posn) {
super(name, mt, posn);
this.isPrivate = isPrivate;
this.isStatic = isStatic;
}
public MemberDecl(MemberDecl md, SourcePosition posn){
public MemberDecl(MemberDecl md, SourcePosition posn) {
super(md.name, md.type, posn);
this.isPrivate = md.isPrivate;
this.isStatic = md.isStatic;

5
miniJava/src/miniJava/AbstractSyntaxTrees/MethodDecl.java
View File

@ -9,8 +9,9 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public class MethodDecl extends MemberDecl {
public MethodDecl(MemberDecl md, ParameterDeclList pl, StatementList sl, Expression e, SourcePosition posn){
super(md,posn);
public MethodDecl(MemberDecl md, ParameterDeclList pl, StatementList sl,
Expression e, SourcePosition posn) {
super(md, posn);
parameterDeclList = pl;
statementList = sl;
returnExp = e;

8
miniJava/src/miniJava/AbstractSyntaxTrees/MethodDeclList.java
View File

@ -7,8 +7,7 @@ package miniJava.AbstractSyntaxTrees;
import java.util.*;
public class MethodDeclList implements Iterable<MethodDecl>
{
public class MethodDeclList implements Iterable<MethodDecl> {
public MethodDeclList() {
methodDeclList = new ArrayList<MethodDecl>();
}
@ -18,11 +17,11 @@ public class MethodDeclList implements Iterable<MethodDecl>
methodDeclList.add(m);
}
public void add(MethodDecl cd){
public void add(MethodDecl cd) {
methodDeclList.add(cd);
}
public MethodDecl get(int i){
public MethodDecl get(int i) {
return methodDeclList.get(i);
}
@ -36,4 +35,3 @@ public class MethodDeclList implements Iterable<MethodDecl>
private List<MethodDecl> methodDeclList;
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/NewArrayExpr.java
View File

@ -7,15 +7,14 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class NewArrayExpr extends NewExpr
{
public NewArrayExpr(Type et, Expression e, SourcePosition posn){
public class NewArrayExpr extends NewExpr {
public NewArrayExpr(Type et, Expression e, SourcePosition posn) {
super(posn);
eltType = et;
sizeExpr = e;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitNewArrayExpr(this, o);
}

2
miniJava/src/miniJava/AbstractSyntaxTrees/NewExpr.java
View File

@ -10,6 +10,6 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public abstract class NewExpr extends Expression {
public NewExpr(SourcePosition posn) {
super (posn);
super(posn);
}
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/NewObjectExpr.java
View File

@ -7,14 +7,13 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class NewObjectExpr extends NewExpr
{
public NewObjectExpr(ClassType ct, SourcePosition posn){
public class NewObjectExpr extends NewExpr {
public NewObjectExpr(ClassType ct, SourcePosition posn) {
super(posn);
classtype = ct;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitNewObjectExpr(this, o);
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/Operator.java
View File

@ -10,11 +10,12 @@ import miniJava.SyntacticAnalyzer.Token;
public class Operator extends Terminal {
public Operator (Token t, SourcePosition posn) {
super (t.spelling, posn);
public Operator(Token t, SourcePosition posn) {
super(t.spelling, posn);
token = t;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitOperator(this, o);
}

2
miniJava/src/miniJava/AbstractSyntaxTrees/Package.java
View File

@ -14,7 +14,7 @@ public class Package extends AST {
classDeclList = cdl;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitPackage(this, o);
}

3
miniJava/src/miniJava/AbstractSyntaxTrees/ParameterDecl.java
View File

@ -9,7 +9,7 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public class ParameterDecl extends LocalDecl {
public ParameterDecl(Type t, String name, SourcePosition posn){
public ParameterDecl(Type t, String name, SourcePosition posn) {
super(name, t, posn);
}
@ -17,4 +17,3 @@ public class ParameterDecl extends LocalDecl {
return v.visitParameterDecl(this, o);
}
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/ParameterDeclList.java
View File

@ -7,8 +7,7 @@ package miniJava.AbstractSyntaxTrees;
import java.util.*;
public class ParameterDeclList implements Iterable<ParameterDecl>
{
public class ParameterDeclList implements Iterable<ParameterDecl> {
public ParameterDeclList() {
parameterDeclList = new ArrayList<ParameterDecl>();
}
@ -18,11 +17,11 @@ public class ParameterDeclList implements Iterable<ParameterDecl>
parameterDeclList.add(p);
}
public void add(ParameterDecl s){
public void add(ParameterDecl s) {
parameterDeclList.add(s);
}
public ParameterDecl get(int i){
public ParameterDecl get(int i) {
return parameterDeclList.get(i);
}

2
miniJava/src/miniJava/AbstractSyntaxTrees/QualifiedRef.java
View File

@ -9,7 +9,7 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public class QualifiedRef extends Reference {
public QualifiedRef(Reference ref, Identifier id, SourcePosition posn){
public QualifiedRef(Reference ref, Identifier id, SourcePosition posn) {
super(posn);
this.ref = ref;
this.id = id;

7
miniJava/src/miniJava/AbstractSyntaxTrees/RefExpr.java
View File

@ -7,14 +7,13 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class RefExpr extends Expression
{
public RefExpr(Reference r, SourcePosition posn){
public class RefExpr extends Expression {
public RefExpr(Reference r, SourcePosition posn) {
super(posn);
ref = r;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitRefExpr(this, o);
}

5
miniJava/src/miniJava/AbstractSyntaxTrees/Reference.java
View File

@ -7,9 +7,8 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public abstract class Reference extends AST
{
public Reference(SourcePosition posn){
public abstract class Reference extends AST {
public Reference(SourcePosition posn) {
super(posn);
}

2
miniJava/src/miniJava/AbstractSyntaxTrees/Statement.java
View File

@ -10,7 +10,7 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
public abstract class Statement extends AST {
public Statement(SourcePosition posn) {
super (posn);
super(posn);
}
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/StatementList.java
View File

@ -7,17 +7,16 @@ package miniJava.AbstractSyntaxTrees;
import java.util.*;
public class StatementList implements Iterable<Statement>
{
public class StatementList implements Iterable<Statement> {
public StatementList() {
slist = new ArrayList<Statement>();
}
public void add(Statement s){
public void add(Statement s) {
slist.add(s);
}
public Statement get(int i){
public Statement get(int i) {
return slist.get(i);
}

2
miniJava/src/miniJava/AbstractSyntaxTrees/Terminal.java
View File

@ -9,7 +9,7 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
abstract public class Terminal extends AST {
public Terminal (String s, SourcePosition posn) {
public Terminal(String s, SourcePosition posn) {
super(posn);
spelling = s;
}

4
miniJava/src/miniJava/AbstractSyntaxTrees/Type.java
View File

@ -9,7 +9,7 @@ import miniJava.SyntacticAnalyzer.SourcePosition;
abstract public class Type extends AST {
public Type(TypeKind typ, SourcePosition posn){
public Type(TypeKind typ, SourcePosition posn) {
super(posn);
typeKind = typ;
}
@ -17,5 +17,3 @@ abstract public class Type extends AST {
public TypeKind typeKind;
}

9
miniJava/src/miniJava/AbstractSyntaxTrees/TypeKind.java
View File

@ -6,12 +6,5 @@
package miniJava.AbstractSyntaxTrees;
public enum TypeKind {
VOID,
INT,
BOOLEAN,
CLASS,
ARRAY,
UNSUPPORTED,
ERROR,
VALID;
VOID, INT, BOOLEAN, CLASS, ARRAY, UNSUPPORTED, ERROR, EQUALS, RELATIONAL;
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/UnaryExpr.java
View File

@ -7,15 +7,14 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class UnaryExpr extends Expression
{
public UnaryExpr(Operator o, Expression e, SourcePosition posn){
public class UnaryExpr extends Expression {
public UnaryExpr(Operator o, Expression e, SourcePosition posn) {
super(posn);
operator = o;
expr = e;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitUnaryExpr(this, o);
}

2
miniJava/src/miniJava/AbstractSyntaxTrees/VarDecl.java
View File

@ -13,7 +13,7 @@ public class VarDecl extends LocalDecl {
super(name, t, posn);
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitVarDecl(this, o);
}
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/VarDeclStmt.java
View File

@ -7,15 +7,14 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class VarDeclStmt extends Statement
{
public VarDeclStmt(VarDecl vd, Expression e, SourcePosition posn){
public class VarDeclStmt extends Statement {
public VarDeclStmt(VarDecl vd, Expression e, SourcePosition posn) {
super(posn);
varDecl = vd;
initExp = e;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitVardeclStmt(this, o);
}

29
miniJava/src/miniJava/AbstractSyntaxTrees/Visitor.java
View File

@ -6,52 +6,75 @@
package miniJava.AbstractSyntaxTrees;
/**
* An implementation of the Visitor interface provides a method visitX
* for each non-abstract AST class X.
* An implementation of the Visitor interface provides a method visitX for each
* non-abstract AST class X.
*/
public interface Visitor<ArgType,ResultType> {
public interface Visitor<ArgType, ResultType> {
// Package
public ResultType visitPackage(Package prog, ArgType arg);
// Declarations
public ResultType visitClassDecl(ClassDecl cd, ArgType arg);
public ResultType visitFieldDecl(FieldDecl fd, ArgType arg);
public ResultType visitMethodDecl(MethodDecl md, ArgType arg);
public ResultType visitParameterDecl(ParameterDecl pd, ArgType arg);
public ResultType visitVarDecl(VarDecl decl, ArgType arg);
// Types
public ResultType visitBaseType(BaseType type, ArgType arg);
public ResultType visitClassType(ClassType type, ArgType arg);
public ResultType visitArrayType(ArrayType type, ArgType arg);
// Statements
public ResultType visitBlockStmt(BlockStmt stmt, ArgType arg);
public ResultType visitVardeclStmt(VarDeclStmt stmt, ArgType arg);
public ResultType visitAssignStmt(AssignStmt stmt, ArgType arg);
public ResultType visitCallStmt(CallStmt stmt, ArgType arg);
public ResultType visitIfStmt(IfStmt stmt, ArgType arg);
public ResultType visitWhileStmt(WhileStmt stmt, ArgType arg);
// Expressions
public ResultType visitUnaryExpr(UnaryExpr expr, ArgType arg);
public ResultType visitBinaryExpr(BinaryExpr expr, ArgType arg);
public ResultType visitRefExpr(RefExpr expr, ArgType arg);
public ResultType visitCallExpr(CallExpr expr, ArgType arg);
public ResultType visitLiteralExpr(LiteralExpr expr, ArgType arg);
public ResultType visitNewObjectExpr(NewObjectExpr expr, ArgType arg);
public ResultType visitNewArrayExpr(NewArrayExpr expr, ArgType arg);
// References
public ResultType visitQualifiedRef(QualifiedRef ref, ArgType arg);
public ResultType visitIndexedRef(IndexedRef ref, ArgType arg);
public ResultType visitIdRef(IdRef ref, ArgType arg);
public ResultType visitThisRef(ThisRef ref, ArgType arg);
// Terminals
public ResultType visitIdentifier(Identifier id, ArgType arg);
public ResultType visitOperator(Operator op, ArgType arg);
public ResultType visitIntLiteral(IntLiteral num, ArgType arg);
public ResultType visitBooleanLiteral(BooleanLiteral bool, ArgType arg);
}

7
miniJava/src/miniJava/AbstractSyntaxTrees/WhileStmt.java
View File

@ -7,15 +7,14 @@ package miniJava.AbstractSyntaxTrees;
import miniJava.SyntacticAnalyzer.SourcePosition;
public class WhileStmt extends Statement
{
public WhileStmt(Expression b, Statement s, SourcePosition posn){
public class WhileStmt extends Statement {
public WhileStmt(Expression b, Statement s, SourcePosition posn) {
super(posn);
cond = b;
body = s;
}
public <A,R> R visit(Visitor<A,R> v, A o) {
public <A, R> R visit(Visitor<A, R> v, A o) {
return v.visitWhileStmt(this, o);
}

21
miniJava/src/miniJava/Compiler.java
View File

@ -3,24 +3,23 @@ package miniJava;
import java.io.*;
import miniJava.SyntacticAnalyzer.*;
import miniJava.AbstractSyntaxTrees.ASTDisplay;
// import miniJava.AbstractSyntaxTrees.ASTDisplay;
import miniJava.AbstractSyntaxTrees.Package;
import miniJava.ContextualAnalyzer.Analyzer;
import miniJava.ContextualAnalyzer.Reporter;
import miniJava.Exceptions.*;
public class Compiler {
private static final int rc = 4;
public static final int rc = 4;
public static void main(String[] args) {
if(args.length == 0) {
if (args.length == 0) {
System.out.println("No file specified");
System.exit(rc);
}
try(FileReader input = new FileReader(args[0])) {
try (FileReader input = new FileReader(args[0])) {
// Setup
Scanner scanner = new Scanner(new BufferedReader(input));
@ -34,17 +33,15 @@ public class Compiler {
// Identification/Type Checking
Analyzer analyzer = new Analyzer();
analyzer.visitPackage(p, null);
if(Reporter.error) System.exit(rc);
System.exit(analyzer.validate());
System.exit(0);
} catch(FileNotFoundException e) {
} catch (FileNotFoundException e) {
System.out.println("***" + e.getMessage());
} catch(IOException e) {
} catch (IOException e) {
System.out.println("***" + e.getMessage());
}catch(ScanningException e) {
} catch (ScanningException e) {
System.out.println("***" + e.getMessage());
} catch(ParsingException e) {
} catch (ParsingException e) {
System.out.println("***" + e.getMessage());
}

490
miniJava/src/miniJava/ContextualAnalyzer/Analyzer.java
View File

@ -1,109 +1,92 @@
package miniJava.ContextualAnalyzer;
import java.util.*;
import miniJava.Compiler;
import miniJava.Exceptions.*;
import miniJava.SyntacticAnalyzer.*;
import miniJava.SyntacticAnalyzer.Scanner;
import miniJava.AbstractSyntaxTrees.*;
import miniJava.AbstractSyntaxTrees.Package;
import miniJava.SyntacticAnalyzer.Parser;
import miniJava.SyntacticAnalyzer.Scanner;
import miniJava.Exceptions.*;
// Check types
// Ensure static members
// Check for main function
public class Analyzer implements Visitor<IdentificationTable, Type> {
// Topmost Identification Table
private MethodDecl mainMethod = null;
private ClassDecl currentClassDecl = null;
private MethodDecl currentMethodDecl = null;
private IdentificationTable table = new IdentificationTable();
// Current class decl is for use with the 'this' keyword
private Declaration currentClassDecl = null;
// Keep track of all predefined names to handle
private static ArrayList<String> predefined;
static
{
predefined = new ArrayList<String>();
predefined.add("class _PrintStream { public void println(int n){} }");
predefined.add("class System { public static _PrintStream out; }");
predefined.add("class String { }");
}
/**
* Adds predefined names to identification table.
* Adds predefined names to topmost table. These names should not be allowed
* redefinition and must be ordered such that no class refers to one
* undeclared yet.
*/
public Analyzer() {
try {
String __PrintStream = "class _PrintStream { public void println(int n){} }";
new Parser(new Scanner(__PrintStream)).parse().visit(this, table);
String _System = "class System { public static _PrintStream out; }";
new Parser(new Scanner(_System)).parse().visit(this, table);
String _String = "class String { }";
new Parser(new Scanner(_String)).parse().visit(this, table);
} catch(ParsingException e) {
System.out.println("Predefined declarations parsing error!");
} catch(ScanningException e) {
System.out.println("Predefined declarations scanning error!");
public Analyzer() throws ParsingException, ScanningException {
for (String s : predefined) {
Scanner scanner = new Scanner(s);
Parser parser = new Parser(scanner);
parser.parse().visit(this, table);
}
}
/**
* Check that two types match.
* @param t1
* @param t2
* Checks that contextual analysis was successful or not, returning the
* proper error code in either case.
*
* @return
*/
private void match(Type t1, Type t2) {
public int validate() {
// Exactly one public static void main(String[] args) function must be declared
if (mainMethod == null)
Reporter.report(ErrorType.MAIN_UNDECLARED, null, null);
// Check class types match
if(t1.typeKind == TypeKind.CLASS) {
if(t2.typeKind != TypeKind.CLASS) {
Reporter.report(ErrorType.TYPE_MISMATCH, t1, t2);
} else {
ClassType c1 = (ClassType) t1;
ClassType c2 = (ClassType) t2;
if(!c1.className.spelling.equals(c2.className.spelling)) {
Reporter.report(ErrorType.TYPE_CLASS_MISMATCH, t1, t2);
}
}
return (Reporter.error) ? Compiler.rc : 0;
}
// Check array types match
else if(t1.typeKind == TypeKind.ARRAY) {
if(t2.typeKind != TypeKind.ARRAY) {
Reporter.report(ErrorType.TYPE_MISMATCH, t1, t2);
} else {
ArrayType a1 = (ArrayType) t1;
ArrayType a2 = (ArrayType) t2;
if(a1.eltType.typeKind != a2.eltType.typeKind) {
Reporter.report(ErrorType.TYPE_ARRAY_MISMATCH, t1, t2);
}
}
}
// Check primitive types match
else if(t1.typeKind != t2.typeKind) {
Reporter.report(ErrorType.TYPE_MISMATCH, t1, t2);
}
}
// /////////////////////////////////////////////////////////////////////////////
//
// PACKAGE
//
// /////////////////////////////////////////////////////////////////////////////
@Override
public Type visitPackage(Package prog, IdentificationTable arg) {
/* Since classes and static methods/fields can be referenced
* before the classes themselves are declared, we preprocess
* all classes and methods first.
/*
* Since classes and static methods/fields can be referenced before the
* classes themselves are declared, we preprocess all classes and
* methods first.
*/
for(ClassDecl cd : prog.classDeclList) {
for (ClassDecl cd : prog.classDeclList) {
IdentificationTable cdTable = table.openScope(cd);
if(cdTable != null) {
if (cdTable != null) {
// Simply add fields to current scope
for(FieldDecl fd : cd.fieldDeclList) {
for (FieldDecl fd : cd.fieldDeclList) {
cdTable.setDeclarationAtScope(fd);
}
// Just Add Declaration (also creates another identification table)
for(MethodDecl md : cd.methodDeclList) {
for (MethodDecl md : cd.methodDeclList) {
cdTable.openScope(md);
}
}
}
// Begin Traversal
for(ClassDecl cd : prog.classDeclList) {
for (ClassDecl cd : prog.classDeclList) {
currentClassDecl = cd;
cd.visit(this, table);
}
@ -111,16 +94,25 @@ public class Analyzer implements Visitor<IdentificationTable, Type> {
return null;
}
@Override
public Type visitClassDecl(ClassDecl cd, IdentificationTable arg) {
IdentificationTable cdTable = arg.getScope(cd);
if(cdTable != null) {
for(FieldDecl fd : cd.fieldDeclList) {
// /////////////////////////////////////////////////////////////////////////////
//
// DECLARATIONS
//
// /////////////////////////////////////////////////////////////////////////////
public Type visitClassDecl(ClassDecl cd, IdentificationTable arg) {
IdentificationTable cdTable = arg.getScope(cd);
if (cdTable != null) {
for (FieldDecl fd : cd.fieldDeclList) {
fd.visit(this, cdTable);
}
for(MethodDecl md : cd.methodDeclList) {
for (MethodDecl md : cd.methodDeclList) {
currentMethodDecl = md;
md.visit(this, cdTable);
}
}
@ -128,142 +120,158 @@ public class Analyzer implements Visitor<IdentificationTable, Type> {
return cd.type;
}
@Override
public Type visitFieldDecl(FieldDecl fd, IdentificationTable arg) {
// Must check that the type of the field can be identified
table.validateClassId(fd.type);
if (!table.classExists(fd.type)) {
Reporter.report(ErrorType.UNDECLARED_TYPE, fd.type, null);
}
return fd.type;
}
@Override
public Type visitMethodDecl(MethodDecl md, IdentificationTable arg) {
IdentificationTable mdTable = arg.getScope(md);
// Check if a valid entry point to program
if (IdentificationTable.isMainMethod(md)) {
if (mainMethod != null)
Reporter.report(ErrorType.MULTIPLE_MAIN, md, mainMethod);
else
mainMethod = md;
}
// Must check that the type of the method can be identified
table.validateClassId(md.type);
if (!table.classExists(md.type)) {
Reporter.report(ErrorType.UNDECLARED_TYPE, md.type, null);
}
// Continue Traversal
if(mdTable != null) {
for(ParameterDecl pd : md.parameterDeclList) {
IdentificationTable mdTable = arg.getScope(md);
if (mdTable != null) {
for (ParameterDecl pd : md.parameterDeclList)
pd.visit(this, mdTable);
}
for(Statement s : md.statementList) {
for (Statement s : md.statementList)
s.visit(this, mdTable);
}
// Check that return type matches expected type
if(md.returnExp != null) {
if (md.returnExp == null && md.type.typeKind != TypeKind.VOID) {
Reporter.report(ErrorType.NO_RETURN, md, null);
} else if (md.returnExp != null) {
Type returnType = md.returnExp.visit(this, mdTable);
match(md.type, returnType);
} else if(md.type.typeKind != TypeKind.VOID) {
Reporter.report(ErrorType.NO_RETURN_EXPRESSION, md.type);
IdentificationTable.match(md.type, returnType, true);
}
}
return md.type;
}
@Override
public Type visitParameterDecl(ParameterDecl pd, IdentificationTable arg) {
arg.setDeclarationAtScope(pd);
table.validateClassId(pd.type);
if (!table.classExists(pd.type)) {
Reporter.report(ErrorType.UNDECLARED_TYPE, pd.type, null);
}
return pd.type;
}
@Override
public Type visitVarDecl(VarDecl decl, IdentificationTable arg) {
arg.setDeclarationAtScope(decl);
table.validateClassId(decl.type);
if (!table.classExists(decl.type)) {
Reporter.report(ErrorType.UNDECLARED_TYPE, decl.type, null);
}
return decl.type;
}
@Override
// /////////////////////////////////////////////////////////////////////////////
//
// TYPES
//
// /////////////////////////////////////////////////////////////////////////////
public Type visitBaseType(BaseType type, IdentificationTable arg) {
return type;
}
@Override
public Type visitClassType(ClassType type, IdentificationTable arg) {
type.className.visit(this, arg);
return type;
}
@Override
public Type visitArrayType(ArrayType type, IdentificationTable arg) {
type.eltType.visit(this, arg);
return type;
}
@Override
// /////////////////////////////////////////////////////////////////////////////
//
// STATEMENTS
//
// /////////////////////////////////////////////////////////////////////////////
public Type visitBlockStmt(BlockStmt stmt, IdentificationTable arg) {
arg.pushLevel();
for(Statement s : stmt.sl) {
for (Statement s : stmt.sl)
s.visit(this, arg);
}
arg.popLevel();
return null;
}
@Override
public Type visitVardeclStmt(VarDeclStmt stmt, IdentificationTable arg) {
// The stmt of the vardecl may not refer to the variable itself so we check the stmt first
public Type visitVardeclStmt(VarDeclStmt stmt, IdentificationTable arg) {
Type initExpType = stmt.initExp.visit(this, arg);
Type varDeclType = stmt.varDecl.visit(this, arg);
match(varDeclType, initExpType);
IdentificationTable.match(varDeclType, initExpType, true);
return varDeclType;
}
@Override
public Type visitAssignStmt(AssignStmt stmt, IdentificationTable arg) {
Type valType = stmt.val.visit(this, arg);
Type refType = stmt.ref.visit(this, arg);
match(valType, refType);
IdentificationTable.match(valType, refType, true);
return refType;
}
@Override
public Type visitCallStmt(CallStmt stmt, IdentificationTable arg) {
Type methodType = stmt.methodRef.visit(this, arg);
// Check that parameter count is correct and each type is correct
MethodDecl decl = (MethodDecl) stmt.methodRef.decl;
if(decl.parameterDeclList.size() != stmt.argList.size()) {
Reporter.report(ErrorType.INVALID_PARAM_COUNT, stmt);
if (decl.parameterDeclList.size() != stmt.argList.size()) {
Reporter.report(ErrorType.INVALID_PARAM_COUNT, stmt, decl);
} else {
for(int i = 0; i < stmt.argList.size(); i++) {
for (int i = 0; i < stmt.argList.size(); i++) {
Type exprType = stmt.argList.get(i).visit(this, arg);
Type pdType = decl.parameterDeclList.get(i).type;
match(pdType, exprType);
IdentificationTable.match(pdType, exprType, true);
}
}
return methodType;
}
@Override
public Type visitIfStmt(IfStmt stmt, IdentificationTable arg) {
// The conditional statment must be a boolean
Type condType = stmt.cond.visit(this, arg);
match(new BaseType(TypeKind.BOOLEAN, null), condType);
IdentificationTable.match(new BaseType(TypeKind.BOOLEAN, null), condType, true);
// A single vardecl cannot exist after a conditional statement
if(stmt.thenStmt instanceof VarDeclStmt) {
Reporter.report(ErrorType.VAR_COND_ONLY, stmt.thenStmt);
if (stmt.thenStmt instanceof VarDeclStmt) {
Reporter.report(ErrorType.SINGLE_VARCOND, stmt.thenStmt, null);
} else {
stmt.thenStmt.visit(this, arg);
if(stmt.elseStmt != null) {
if(stmt.elseStmt instanceof VarDeclStmt) {
Reporter.report(ErrorType.VAR_COND_ONLY, stmt.elseStmt);
if (stmt.elseStmt != null) {
if (stmt.elseStmt instanceof VarDeclStmt) {
Reporter.report(ErrorType.SINGLE_VARCOND, stmt.elseStmt,
null);
} else {
stmt.elseStmt.visit(this, arg);
}
@ -273,15 +281,15 @@ public class Analyzer implements Visitor<IdentificationTable, Type> {
return null;
}
@Override
public Type visitWhileStmt(WhileStmt stmt, IdentificationTable arg) {
// The conditional statment must be a boolean
Type condType = stmt.cond.visit(this, arg);
match(new BaseType(TypeKind.BOOLEAN, null), condType);
IdentificationTable.match(new BaseType(TypeKind.BOOLEAN, null), condType, true);
if(stmt.body instanceof VarDeclStmt) {
Reporter.report(ErrorType.VAR_COND_ONLY, stmt.body);
// A single vardecl cannot exist after a conditional statement
if (stmt.body instanceof VarDeclStmt) {
Reporter.report(ErrorType.SINGLE_VARCOND, stmt.body, null);
} else {
stmt.body.visit(this, arg);
}
@ -289,164 +297,270 @@ public class Analyzer implements Visitor<IdentificationTable, Type> {
return null;
}
@Override
// /////////////////////////////////////////////////////////////////////////////
//
// EXPRESSIONS
//
// /////////////////////////////////////////////////////////////////////////////
public Type visitUnaryExpr(UnaryExpr expr, IdentificationTable arg) {
Type opType = expr.operator.visit(this, arg);
Type exprType = expr.expr.visit(this, arg);
match(opType, exprType);
IdentificationTable.match(opType, exprType, true);
return null;
return opType;
}
@Override
public Type visitBinaryExpr(BinaryExpr expr, IdentificationTable arg) {
Type opType = expr.operator.visit(this, arg);
Type leftType = expr.left.visit(this, arg);
Type rightType = expr.right.visit(this, arg);
match(opType, leftType);
match(opType, rightType);
return null;
// Both sides must be the same
if(opType.typeKind == TypeKind.EQUALS) {
IdentificationTable.match(leftType, rightType, true);
return new BaseType(TypeKind.BOOLEAN, opType.posn);
}
// Both sides must be integers
else if(opType.typeKind == TypeKind.RELATIONAL) {
BaseType bt = new BaseType(TypeKind.INT, opType.posn);
IdentificationTable.match(bt, leftType, true);
IdentificationTable.match(bt, rightType, true);
return new BaseType(TypeKind.BOOLEAN, opType.posn);
}
// Both sides must match operator type
IdentificationTable.match(leftType, opType, true);
IdentificationTable.match(rightType, opType, true);
return opType;
}
@Override
public Type visitRefExpr(RefExpr expr, IdentificationTable arg) {
return expr.ref.visit(this, arg);
Type exprType = expr.ref.visit(this, arg);
return exprType;
}
@Override
public Type visitCallExpr(CallExpr expr, IdentificationTable arg) {
Type functionType = expr.functionRef.visit(this, arg);
Type functionRefType = expr.functionRef.visit(this, arg);
if(expr.functionRef.decl instanceof MethodDecl) {
MethodDecl decl = (MethodDecl) expr.functionRef.decl;
// Check that parameter count is correct and each type is correct
MethodDecl decl = (MethodDecl) expr.functionRef.decl;
if(decl.parameterDeclList.size() != expr.argList.size()) {
Reporter.report(ErrorType.INVALID_PARAM_COUNT, expr);
if (decl.parameterDeclList.size() != expr.argList.size()) {
Reporter.report(ErrorType.INVALID_PARAM_COUNT, expr, decl);
} else {
for(int i = 0; i < expr.argList.size(); i++) {
for (int i = 0; i < expr.argList.size(); i++) {
Type exprType = expr.argList.get(i).visit(this, arg);
Type pdType = decl.parameterDeclList.get(i).type;
match(pdType, exprType);
IdentificationTable.match(pdType, exprType, true);
}
}
} else {
Reporter.report(ErrorType.NONFUNCTION_CALL, expr, null);
}
return functionType;
return functionRefType;
}
@Override
public Type visitLiteralExpr(LiteralExpr expr, IdentificationTable arg) {
return expr.literal.visit(this, arg);
Type literalType = expr.literal.visit(this, arg);
return literalType;
}
@Override
public Type visitNewObjectExpr(NewObjectExpr expr, IdentificationTable arg) {
return expr.classtype.visit(this, arg);
Type objectType = expr.classtype.visit(this, arg);
return objectType;
}
@Override
public Type visitNewArrayExpr(NewArrayExpr expr, IdentificationTable arg) {
Type sizeExprType = expr.sizeExpr.visit(this, arg);
if(sizeExprType.typeKind != TypeKind.INT) {
Reporter.report(ErrorType.INVALID_INDEX, expr.sizeExpr);
if (sizeExprType.typeKind != TypeKind.INT) {
Reporter.report(ErrorType.INVALID_INDEX, expr.sizeExpr, null);
}
return expr.eltType.visit(this, arg);
Type eltType = expr.eltType.visit(this, arg);
return new ArrayType(eltType, expr.posn);
}
@Override
// /////////////////////////////////////////////////////////////////////////////
//
// REFERENCES
//
// /////////////////////////////////////////////////////////////////////////////
public Type visitQualifiedRef(QualifiedRef ref, IdentificationTable arg) {
ref.ref.visit(this, arg);
ref.id.visit(this, arg);
// Check that each declaration is nested properly
if(ref.decl == null || table.getDeclaration(ref.decl.name) == null) {
System.out.println(ref.id.spelling);
// report(ErrorType.MISSING_DECL, ref.ref.decl);
Type refType = ref.ref.visit(this, arg);
// Note qualified ref's only make sense in the context of classes
if(refType.typeKind != TypeKind.CLASS) {
if(refType.typeKind != TypeKind.ERROR) // Don't need to report multiple times
Reporter.report(ErrorType.TYPE_MISMATCH, new BaseType(TypeKind.CLASS, null), refType);
return refType;
}
return null;
// Try to find qualified member
Declaration qualified = ref.ref.decl;
ClassType qualType = (ClassType) qualified.type;
Declaration qualClassDecl = table.getDeclaration(qualType.className.spelling);
if(qualClassDecl == null) {
Reporter.report(ErrorType.UNDECLARED_TYPE, qualified.type, null);
return new BaseType(TypeKind.ERROR, qualified.posn);
}
// Get member
IdentificationTable cdTable = table.getScope(qualClassDecl);
MemberDecl md = (MemberDecl) cdTable.getDeclarationAtScope(ref.id.spelling);
// Check the member exists at all
if(md == null) {
Reporter.report(ErrorType.UNDEFINED, ref.id, null);
return new BaseType(TypeKind.ERROR, ref.id.posn);
}
// If the qualifed ref is a class declaration, members must be static
else if(qualified instanceof ClassDecl) {
if(!md.isStatic) {
Reporter.report(ErrorType.STATIC, md, ref.id);
return new BaseType(TypeKind.ERROR, ref.id.posn);
} else if(md.isPrivate) {
Reporter.report(ErrorType.VISIBILITY, md, ref.id);
return new BaseType(TypeKind.ERROR, ref.id.posn);
}
}
// The member should not be a method, as this is unsupported
else if(qualified instanceof MethodDecl) {
Reporter.report(ErrorType.UNDEFINED, ref.id, null);
}
// Otherwise, we can assume the object is a variable and attempt to access members
else if(md.isPrivate && currentClassDecl != qualClassDecl) {
Reporter.report(ErrorType.VISIBILITY, md, ref.id);
return new BaseType(TypeKind.ERROR, ref.id.posn);
}
ref.id.decl = md;
ref.decl = md;
return md.type;
}
@Override
public Type visitIndexedRef(IndexedRef ref, IdentificationTable arg) {
ref.ref.visit(this, arg);
ref.decl = ref.ref.decl;
Type refType = ref.ref.visit(this, arg);
// Make sure index is an integer
Type indexExprType = ref.indexExpr.visit(this, arg);
if(indexExprType.typeKind != TypeKind.INT) {
Reporter.report(ErrorType.INVALID_INDEX, ref.indexExpr);
if (indexExprType.typeKind != TypeKind.INT) {
Reporter.report(ErrorType.INVALID_INDEX, ref.indexExpr, null);
}
return ref.decl.type;
ref.decl = ref.ref.decl;
return refType;
}
@Override
public Type visitIdRef(IdRef ref, IdentificationTable arg) {
ref.id.visit(this, arg);
Type idType = ref.id.visit(this, arg);
ref.decl = ref.id.decl;
return ref.decl.type;
return idType;
}
@Override
public Type visitThisRef(ThisRef ref, IdentificationTable arg) {
ref.decl = currentClassDecl;
if(currentMethodDecl.isStatic) {
Reporter.report(ErrorType.THIS, ref, currentMethodDecl);
}
return ref.decl.type;
}
@Override
// /////////////////////////////////////////////////////////////////////////////
//
// TERMINALS
//
// /////////////////////////////////////////////////////////////////////////////
public Type visitIdentifier(Identifier id, IdentificationTable arg) {
// Try to find identifier, reporting a message if it cannot be found
Declaration decl = arg.getDeclaration(id.spelling);
if(decl == null) {
Reporter.report(ErrorType.UNIDENTIFIED, id);
return new BaseType(TypeKind.ERROR, null);
// Check if identifier can be found in current scope
Declaration decl = arg.getDeclarationAtScope(id.spelling);
if (decl != null) { id.decl = decl; return decl.type; }
// Access member and check visibility properties
Declaration d = arg.getDeclaration(id.spelling);
if(d == null) {
Reporter.report(ErrorType.UNDEFINED, id, null);
return new BaseType(TypeKind.ERROR, id.posn);
} else {
id.decl = decl;
return decl.type;
// Can only be a member at this point
if(d.type.typeKind != TypeKind.CLASS) {
MemberDecl md = (MemberDecl) d;
// A static method cannot access instance members
if(currentMethodDecl.isStatic && !md.isStatic) {
Reporter.report(ErrorType.STATIC, md, id);
return new BaseType(TypeKind.ERROR, id.posn);
}
// If a member declaration is private, it must be a member of the current class
else if(md.isPrivate) {
// Check if member is part of the current class
IdentificationTable cdTable = table.getScope(currentClassDecl);
if(cdTable.getDeclarationAtScope(md.name) == null) {
Reporter.report(ErrorType.VISIBILITY, md, id);
return new BaseType(TypeKind.ERROR, id.posn);
}
}
}
id.decl = d;
return d.type;
}
}
@Override
public Type visitOperator(Operator op, IdentificationTable arg) {
switch(op.token.spelling) {
switch (op.token.spelling) {
case "!":
case ">":
case "<":
case "==":
case "<=":
case ">=":
case "!=":
case "&&":
case "||":
return new BaseType(TypeKind.BOOLEAN, op.posn);
case ">":
case "<":
case "<=":
case ">=":
return new BaseType(TypeKind.RELATIONAL, op.posn);
case "+":
case "-":
case "*":
case "/":
return new BaseType(TypeKind.INT, op.posn);
default:
Reporter.report(ErrorType.UNIDENTIFIED_TYPE, op);
return new BaseType(TypeKind.ERROR, op.posn);
}
case "==":
case "!=":
return new BaseType(TypeKind.EQUALS, op.posn);
}
return null;
}
@Override
public Type visitIntLiteral(IntLiteral num, IdentificationTable arg) {
return new BaseType(TypeKind.INT, num.posn);
}
@Override
public Type visitBooleanLiteral(BooleanLiteral bool, IdentificationTable arg) {
return new BaseType(TypeKind.BOOLEAN, bool.posn);

164
miniJava/src/miniJava/ContextualAnalyzer/IdentificationTable.java
View File

@ -1,12 +1,8 @@
package miniJava.ContextualAnalyzer;
import java.util.HashMap;
import java.util.ArrayList;
import java.util.*;
import miniJava.AbstractSyntaxTrees.ClassType;
import miniJava.AbstractSyntaxTrees.Declaration;
import miniJava.AbstractSyntaxTrees.Type;
import miniJava.AbstractSyntaxTrees.TypeKind;
import miniJava.AbstractSyntaxTrees.*;
public class IdentificationTable {
@ -33,29 +29,29 @@ public class IdentificationTable {
}
/**
* Adds another level for variables to be stored at (they will be
* removed when popping said level).
*/
public void pushLevel() {
table.add(new HashMap<String, Declaration>());
}
/**
* Removes all variables declared at the current level (these are
* no longer accessible).
* Adds another level for variables to be stored at
*/
public void popLevel() {
table.remove(table.size() - 1);
}
/**
* This method will only ever be called with class/method declarations
* Removes all variables declared at the current level
*/
public void pushLevel() {
table.add(new HashMap<String, Declaration>());
}
/**
* This method will only ever be called with class/method declarations.
*
* @param decl
* @return
*/
public IdentificationTable openScope(Declaration decl) {
if(scope.containsKey(decl.name) || getDeclarationAtScope(decl.name) != null) {
Reporter.report(ErrorType.REDEFINITION, decl);
Declaration current = getDeclarationAtScope(decl.name);
if (scope.containsKey(decl.name) || current != null) {
Reporter.report(ErrorType.REDEFINITION, decl, current);
return null;
} else {
table.get(table.size() - 1).put(decl.name, decl);
@ -65,12 +61,14 @@ public class IdentificationTable {
}
/**
* Return nested scope corresponding to declaration (or null if non-existant).
* Return nested scope corresponding to declaration (or null if
* non-existant).
*
* @param decl
* @return
*/
public IdentificationTable getScope(Declaration decl) {
if(scope.containsKey(decl.name)) {
if (scope.containsKey(decl.name)) {
return scope.get(decl.name);
}
@ -78,37 +76,34 @@ public class IdentificationTable {
}
/**
* Iterates through all parents and tries to find the specified
* declaration by name.
* Iterates through all parents and tries to find the specified declaration
* by name.
*
* @param name
* @return
*/
public Declaration getDeclaration(String name) {
IdentificationTable current = this;
while(current != null) {
while (current != null) {
Declaration decl = current.getDeclarationAtScope(name);
if(decl == null) {
current = current.parent;
} else {
return decl;
}
if (decl == null) current = current.parent;
else return decl;
}
return null;
}
/**
* Iterates through levels (from higher to lower) for declaration,
* returning none if it does not exist.
* Iterates through levels (from higher to lower) for declaration, returning
* none if it does not exist.
*
* @param name
* @return
*/
public Declaration getDeclarationAtScope(String name) {
for(int i = table.size() - 1; i >= 0; i--) {
for (int i = table.size() - 1; i >= 0; i--) {
HashMap<String, Declaration> level = table.get(i);
if(level.containsKey(name)) {
return level.get(name);
}
if (level.containsKey(name)) return level.get(name);
}
return null;
@ -116,13 +111,15 @@ public class IdentificationTable {
/**
* Add declaration to current table's table member.
*
* @param name
*/
public void setDeclarationAtScope(Declaration decl) {
for(int i = 0; i < table.size(); i++) {
for (int i = 0; i < table.size(); i++) {
HashMap<String, Declaration> level = table.get(i);
if(level.containsKey(decl.name)) {
Reporter.report(ErrorType.REDEFINITION, decl);
if (level.containsKey(decl.name)) {
Declaration defined = level.get(decl.name);
Reporter.report(ErrorType.REDEFINITION, decl, defined);
return;
}
}
@ -131,15 +128,94 @@ public class IdentificationTable {
}
/**
* Checks that the passed class type does exist.
* @param ct
* Checks whether the specified class has been declared.
*
* @param t
* @return
*/
public void validateClassId(Type t) {
if(t.typeKind == TypeKind.CLASS) {
public boolean classExists(Type t) {
if (t.typeKind == TypeKind.CLASS) {
ClassType ct = (ClassType) t;
if(getDeclaration(ct.className.spelling) == null) {
Reporter.report(ErrorType.MISSING_DECL, ct);
return getDeclaration(ct.className.spelling) != null;
}
return true;
}
/**
* Determines whether two types match.
*
* @param t1
* @param t2
* @return
*/
public static boolean match(Type t1, Type t2) {
return IdentificationTable.match(t1, t2, false);
}
/**
* Determines whether two type match, reporting an error if they do not.
*
* @param t1
* @param t2
* @param report
* @return
*/
public static boolean match(Type t1, Type t2, boolean report) {
if (t1.typeKind != t2.typeKind) {
if (report) Reporter.report(ErrorType.TYPE_MISMATCH, t1, t2);
return false;
}
// Check Class Types match
else if (t1.typeKind == TypeKind.CLASS) {
ClassType c1 = (ClassType) t1;
ClassType c2 = (ClassType) t2;
if (!c1.className.spelling.equals(c2.className.spelling)) {
if (report) Reporter.report(ErrorType.TYPE_MISMATCH, t1, t2);
return false;
}
}
// Check array types match
else if (t1.typeKind == TypeKind.ARRAY) {
ArrayType a1 = (ArrayType) t1;
ArrayType a2 = (ArrayType) t2;
if (!IdentificationTable.match(a1.eltType, a2.eltType)) {
if (report) Reporter.report(ErrorType.TYPE_MISMATCH, t1, t2);
return false;
}
}
return true;
}
/**
* Determines if the passed method is a valid entry point for the
* compilation phase.
*
* @param md
* @return
*/
public static boolean isMainMethod(MethodDecl md) {
// Check Declaration
if (!md.isPrivate && md.isStatic && md.type.typeKind == TypeKind.VOID
&& md.name.equals("main") && md.parameterDeclList.size() == 1) {
// Check Parameter Declaration
ParameterDecl pd = md.parameterDeclList.get(0);
if (pd.type.typeKind != TypeKind.ARRAY) return false;
ArrayType at = (ArrayType) pd.type;
if (at.eltType.typeKind != TypeKind.CLASS) return false;
ClassType ct = (ClassType) at.eltType;
return ct.className.spelling.equals("String");
}
return false;
}
}

204
miniJava/src/miniJava/ContextualAnalyzer/Reporter.java
View File

@ -3,17 +3,20 @@ package miniJava.ContextualAnalyzer;
import miniJava.AbstractSyntaxTrees.*;
enum ErrorType {
VAR_COND_ONLY,
MISSING_DECL,
UNIDENTIFIED,
REDEFINITION,
INVALID_PARAM_COUNT,
INVALID_INDEX,
THIS,
NONFUNCTION_CALL,
UNDEFINED,
STATIC,
VISIBILITY,
NO_RETURN,
TYPE_MISMATCH,
UNIDENTIFIED_TYPE,
TYPE_CLASS_MISMATCH,
TYPE_ARRAY_MISMATCH,
NO_RETURN_EXPRESSION;
REDEFINITION,
MAIN_UNDECLARED,
INVALID_PARAM_COUNT,
MULTIPLE_MAIN,
UNDECLARED_TYPE,
SINGLE_VARCOND,
INVALID_INDEX
}
public class Reporter {
@ -21,102 +24,147 @@ public class Reporter {
public static boolean error = false;
/**
* Prints out to console correct error message.
* @param type
* @param ast
* Convenience function for getting type names.
*
* @param t
* @return
*/
public static void report(ErrorType type, AST ast) {
error = true;
switch(type) {
private static String getTypeName(Type t) {
if (t instanceof ClassType) {
ClassType ct = (ClassType) t;
return ct.className.spelling;
} else if (t instanceof ArrayType) {
ArrayType at = (ArrayType) t;
return getTypeName(at.eltType);
}
// VarDeclStmt is only statement in conditional branch
case VAR_COND_ONLY: {
System.out.println("***Conditional statment cannot be followed by a variable declaration statement " + ast.posn);
return t.typeKind.toString();
}
/**
* Convenience method for formatting error message.
*
* @param message
*/
private static void emit(String message) {
System.out.println("***" + message);
}
/**
* Convenience function for managing all error types.
*
* @param type
* @param a1
* @param a2
*/
public static void report(ErrorType type, AST a1, AST a2) {
switch (type) {
// Cannot access 'this' in a static method
case THIS: {
MethodDecl md = (MethodDecl) a2;
emit("Cannot reference 'this' " + a1.posn + " in static method '" + md.name + "' " + md.posn);
break;
}
// Declaration does not exist for reference
case MISSING_DECL: {
System.out.println("***Reference to a non-existant type " + ast.posn);
// Attempting to call a non function as a function
case NONFUNCTION_CALL: {
emit("Not a valid function call at " + a1.posn);
break;
}
// Reports when a reference could not be found
case UNIDENTIFIED: {
System.out.println("***Reference refers to a declaration that does not exist " + ast.posn);
// Tried accessing a non-static member from a static method
case STATIC: {
MemberDecl md = (MemberDecl) a1;
Identifier ident = (Identifier) a2;
emit("'" + md.name + "' " + md.posn + " is an instance member and cannot be accessed at " + ident.posn);
break;
}
// Tried accessing a private member of a different class
case VISIBILITY: {
MemberDecl md = (MemberDecl) a1;
Identifier ident = (Identifier) a2;
emit("'" + md.name + "' " + md.posn + " is a private member and cannot be accessed at " + ident.posn);
break;
}
// Non-void function does not have a return statement
case NO_RETURN: {
MethodDecl md = (MethodDecl) a1;
emit("'" + md.name + "' " + md.posn + " must have a return statement");
break;
}
// The passed types are not the same
case TYPE_MISMATCH: {
String name1 = getTypeName((Type) a1);
String name2 = getTypeName((Type) a2);
if(a1 instanceof ArrayType) name1 += " Array";
if(a2 instanceof ArrayType) name2 += " Array";
emit("Expected type '" + name1 + "' but got '" + name2 + "' " + a2.posn);
break;
}
// Attempting to redeclare a variable
case REDEFINITION: {
System.out.println("***Variable has already been defined earlier " + ast.posn);
emit("Variable at " + a1.posn + " already declared earlier at " + a2.posn);
break;
}
// A non void function does not have a return statement
case NO_RETURN_EXPRESSION: {
System.out.println("***Non-void method does not have a return statement " + ast.posn);
// Identifier could not be found
case UNDEFINED: {
Identifier ident = (Identifier) a1;
emit("Identifier '" + ident.spelling + "' " + ident.posn + " is undeclared.");
break;
}
// The number of parameters passed is either too few or too great
// A public static void main(String[] args) method was not declared
case MAIN_UNDECLARED: {
emit("A main function was not declared");
break;
}
// Parameter counts of an expression/statement do not match declaration
case INVALID_PARAM_COUNT: {
System.out.println("***The number of passed parameters does not equal expected count " + ast.posn);
MethodDecl md = (MethodDecl) a2;
emit("Call to '" + md.name + "' " + a2.posn + " has an invalid parameter count at " + a1.posn);
break;
}
// The expected expression MUST return an int (such as the index of an array)
// A public static void main(String[] args) was declared more than once
case MULTIPLE_MAIN: {
emit("Main function at " + a1.posn + " already declared previously at " + a2.posn);
break;
}
// A reference has been made to a non-existant type
case UNDECLARED_TYPE: {
if(a1 instanceof Type) {
String typeName = getTypeName((Type) a1);
emit("'" + typeName + "' " + a1.posn + " has not been declared previously");
} else {
emit("Identifier at " + a1.posn + " could not be identified");
}
break;
}
// A Variable Declaration Statement was made as the only statement of a condition
case SINGLE_VARCOND: {
emit("Conditional statment cannot be followed by a variable declaration statement exclusively " + a1.posn);
break;
}
// An indexed expression must be of an int type
case INVALID_INDEX: {
System.out.println("***Expected an integer value as the index of an array " + ast.posn);
break;
}
// Hmmm.....
case UNIDENTIFIED_TYPE: {
System.out.println("***Unexpected type " + ast.posn);
break;
}
// Clear Warning
default:
emit("Index expression is not of type int " + a1.posn);
break;
}
}
/**
* Type specific error reporting.
* @param type
* @param t1
* @param t2
*/
public static void report(ErrorType type, Type t1, Type t2) {
error = true;
switch(type) {
// Non class/array types don't match
case TYPE_MISMATCH: {
System.out.println("***Expected type " + t1.typeKind + " but got " + t2.typeKind + t2.posn);
break;
}
// Two classes don't match
case TYPE_CLASS_MISMATCH: {
ClassType c1 = (ClassType) t1;
ClassType c2 = (ClassType) t2;
System.out.println("***Expected type " + c1.className.spelling + " but got " + c2.className.spelling + c2.posn);
break;
}
// Two arrays don't match
case TYPE_ARRAY_MISMATCH: {
ArrayType a1 = (ArrayType) t1;
ArrayType a2 = (ArrayType) t2;
System.out.println("***Expected array type " + a1.eltType.typeKind + " but got " + a2.eltType.typeKind + t2.posn);
break;
}
// Clear Warning
default:
break;
}
}
}

2
miniJava/src/miniJava/Exceptions/ParsingException.java
View File

@ -11,7 +11,7 @@ public class ParsingException extends Exception {
}
public ParsingException(Token t) {
super("Parsing error with " + t.toString());
super("Parsing error with " + t.spelling + " at " + t.posn.toString());
}
}

171
miniJava/src/miniJava/SyntacticAnalyzer/Parser.java
View File

@ -19,11 +19,12 @@ public class Parser {
/**
* Program ::= (ClassDeclaration)* eot
* @return
* @throws ParsingException
* @throws ScanningException
*/
public Package parse() throws ParsingException, ScanningException {
ClassDeclList decls = new ClassDeclList();
while(peek(1).type == Token.TYPE.CLASS) {
while (peek(1).type == Token.TYPE.CLASS) {
decls.add(parseClassDeclaration());
}
@ -32,14 +33,13 @@ public class Parser {
}
/**
* ClassDeclaration ::=
* class id {
* (Declarators id (; | MethodDeclaration))*
* }
* ClassDeclaration ::= class id { (Declarators id (; | MethodDeclaration))* }
* @return
* @throws ParsingException
* @throws ScanningException
*/
private ClassDecl parseClassDeclaration() throws ParsingException, ScanningException {
private ClassDecl parseClassDeclaration() throws ParsingException,
ScanningException {
// Class Header
Token classToken = accept(Token.TYPE.CLASS);
@ -51,19 +51,21 @@ public class Parser {
MethodDeclList mdl = new MethodDeclList();
// Class Body
while(peek(1).type != Token.TYPE.RBRACKET) {
while (peek(1).type != Token.TYPE.RBRACKET) {
Declarators d = parseDeclarators();
String name = accept(Token.TYPE.ID).spelling;
FieldDecl f = new FieldDecl(d.isPrivate, d.isStatic, d.mt, name, d.posn);
FieldDecl f = new FieldDecl(d.isPrivate, d.isStatic, d.mt, name,
d.posn);
// Field Declarations
if(peek(1).type == Token.TYPE.SEMICOLON) {
if (peek(1).type == Token.TYPE.SEMICOLON) {
accept(Token.TYPE.SEMICOLON);
fdl.add(f);
}
// Method Declarations
else mdl.add(parseMethodDeclaration(f));
else
mdl.add(parseMethodDeclaration(f));
}
accept(Token.TYPE.RBRACKET);
@ -73,26 +75,28 @@ public class Parser {
/**
* Declarators ::= (public | private)? static? Type
* @return
* @throws ParsingException
* @throws ScanningException
*/
private Declarators parseDeclarators() throws ParsingException, ScanningException {
private Declarators parseDeclarators() throws ParsingException,
ScanningException {
// Visibility
SourcePosition start = null;
boolean isPrivate = false;
if(peek(1).type == Token.TYPE.PUBLIC) {
if (peek(1).type == Token.TYPE.PUBLIC) {
start = accept(Token.TYPE.PUBLIC).posn;
} else if(peek(1).type == Token.TYPE.PRIVATE) {
} else if (peek(1).type == Token.TYPE.PRIVATE) {
isPrivate = true;
start = accept(Token.TYPE.PRIVATE).posn;
}
// Class Methods
boolean isStatic = false;
if(peek(1).type == Token.TYPE.STATIC) {
if (peek(1).type == Token.TYPE.STATIC) {
isStatic = true;
if(start == null) {
if (start == null) {
start = accept(Token.TYPE.STATIC).posn;
} else {
accept(Token.TYPE.STATIC);
@ -100,7 +104,7 @@ public class Parser {
}
Type t = parseType();
if(start == null) {
if (start == null) {
start = t.posn;
}
@ -108,22 +112,22 @@ public class Parser {
}
/**
* * MethodDeclaration ::=
* (ParameterList?) {
* Statement* (return Expression ;)?
* }
* @param f describes the declaratory aspect of the method
* MethodDeclaration ::= (ParameterList?) { Statement* (return Expression;)? }
* @param f
* @return
* @throws ParsingException
* @throws ScanningException
*/
private MethodDecl parseMethodDeclaration(FieldDecl f) throws ParsingException, ScanningException {
private MethodDecl parseMethodDeclaration(FieldDecl f)
throws ParsingException, ScanningException {
// Method Header
accept(Token.TYPE.LPAREN);
// Parameter List
ParameterDeclList pdl = new ParameterDeclList();
if(peek(1).type != Token.TYPE.RPAREN) pdl = parseParameterList();
if (peek(1).type != Token.TYPE.RPAREN)
pdl = parseParameterList();
accept(Token.TYPE.RPAREN);
accept(Token.TYPE.LBRACKET);
@ -131,9 +135,9 @@ public class Parser {
// Method Body
Expression re = null;
StatementList stl = new StatementList();
while(peek(1).type != Token.TYPE.RBRACKET) {
while (peek(1).type != Token.TYPE.RBRACKET) {
if(peek(1).type == Token.TYPE.RETURN) {
if (peek(1).type == Token.TYPE.RETURN) {
accept(Token.TYPE.RETURN);
re = parseExpression();
accept(Token.TYPE.SEMICOLON);
@ -150,13 +154,14 @@ public class Parser {
/**
* Type ::= boolean | void | int ([])? | id ([])?
* @return
* @throws ParsingException
* @throws ScanningException
*/
private Type parseType() throws ParsingException, ScanningException {
SourcePosition posn = null;
switch(peek(1).type) {
switch (peek(1).type) {
case BOOLEAN:
posn = accept(Token.TYPE.BOOLEAN).posn;
@ -170,7 +175,7 @@ public class Parser {
posn = accept(Token.TYPE.INT).posn;
BaseType b = new BaseType(TypeKind.INT, posn);
if(peek(1).type == Token.TYPE.LSQUARE) {
if (peek(1).type == Token.TYPE.LSQUARE) {
accept(Token.TYPE.LSQUARE);
accept(Token.TYPE.RSQUARE);
return new ArrayType(b, posn);
@ -184,7 +189,7 @@ public class Parser {
Identifier i = new Identifier(id.spelling, id.posn);
ClassType c = new ClassType(i, id.posn);
if(peek(1).type == Token.TYPE.LSQUARE) {
if (peek(1).type == Token.TYPE.LSQUARE) {
accept(Token.TYPE.LSQUARE);
accept(Token.TYPE.RSQUARE);
return new ArrayType(c, id.posn);
@ -201,6 +206,7 @@ public class Parser {
/**
* ParameterList ::= Type id (, Type id)*
* @return
* @throws ParsingException
* @throws ScanningException
*/
private ParameterDeclList parseParameterList() throws ParsingException, ScanningException {
@ -213,7 +219,7 @@ public class Parser {
decls.add(new ParameterDecl(t, id.spelling, id.posn));
// Remainder of List
while(peek(1).type == Token.TYPE.COMMA) {
while (peek(1).type == Token.TYPE.COMMA) {
accept(Token.TYPE.COMMA);
Type nextType = parseType();
Token nextId = accept(Token.TYPE.ID);
@ -226,12 +232,13 @@ public class Parser {
/**
* ArgumentList ::= Expression (, Expression)*
* @return
* @throws ParsingException
* @throws ScanningException
*/
private ExprList parseArgumentList() throws ParsingException, ScanningException {
ExprList e = new ExprList();
e.add(parseExpression());
while(peek(1).type == Token.TYPE.COMMA) {
while (peek(1).type == Token.TYPE.COMMA) {
accept(Token.TYPE.COMMA);
e.add(parseExpression());
}
@ -242,17 +249,18 @@ public class Parser {
/**
* Reference ::= BaseRef (. BaseRef)*
* @return
* @throws ParsingException
* @throws ScanningException
*/
private Reference parseReference() throws ParsingException, ScanningException {
Reference r = parseBaseRef();
while(peek(1).type == Token.TYPE.PERIOD) {
while (peek(1).type == Token.TYPE.PERIOD) {
accept(Token.TYPE.PERIOD);
Token tokenId = accept(Token.TYPE.ID);
Identifier id = new Identifier(tokenId.spelling, tokenId.posn);
r = new QualifiedRef(r, id, tokenId.posn);
if(peek(1).type == Token.TYPE.LSQUARE) {
if (peek(1).type == Token.TYPE.LSQUARE) {
accept(Token.TYPE.LSQUARE);
Expression e = parseExpression();
accept(Token.TYPE.RSQUARE);
@ -266,11 +274,12 @@ public class Parser {
/**
* BaseRef ::= this | id ([ Expression])?
* @return
* @throws ParsingException
* @throws ScanningException
*/
private Reference parseBaseRef() throws ParsingException, ScanningException {
switch(peek(1).type) {
switch (peek(1).type) {
case THIS: {
Token thisToken = accept(Token.TYPE.THIS);
return new ThisRef(thisToken.posn);
@ -282,7 +291,7 @@ public class Parser {
Identifier i = new Identifier(id.spelling, id.posn);
IdRef r = new IdRef(i, id.posn);
if(peek(1).type == Token.TYPE.LSQUARE) {
if (peek(1).type == Token.TYPE.LSQUARE) {
accept(Token.TYPE.LSQUARE);
Expression e = parseExpression();
accept(Token.TYPE.RSQUARE);
@ -295,25 +304,22 @@ public class Parser {
}
/**
* Statement ::=
* {Statement*}
* | Type id = Expression;
* | Reference = Expression;
* | Reference ( ArgumentList? );
* | if (Expression) Statement (else Statement)?
* | while (Expression) Statement
* Statement ::= {Statement*} | Type id = Expression; | Reference =
* Expression; | Reference ( ArgumentList? ); | if (Expression) Statement
* (else Statement)? | while (Expression) Statement
* @return
* @throws ParsingException
* @throws ScanningException
*/
private Statement parseStatement() throws ParsingException, ScanningException {
switch(peek(1).type) {
switch (peek(1).type) {
// { Statement* }
case LBRACKET: {
Token leftToken = accept(Token.TYPE.LBRACKET);
StatementList stl = new StatementList();
while(peek(1).type != Token.TYPE.RBRACKET) {
while (peek(1).type != Token.TYPE.RBRACKET) {
stl.add(parseStatement());
}
accept(Token.TYPE.RBRACKET);
@ -328,7 +334,7 @@ public class Parser {
Expression e = parseExpression();
accept(Token.TYPE.RPAREN);
Statement s1 = parseStatement();
if(peek(1).type == Token.TYPE.ELSE) {
if (peek(1).type == Token.TYPE.ELSE) {
accept(Token.TYPE.ELSE);
Statement s2 = parseStatement();
return new IfStmt(e, s1, s2, ifToken.posn);
@ -349,11 +355,15 @@ public class Parser {
}
// Type id = Expression ;
case BOOLEAN: case VOID: case INT: case ID: {
case BOOLEAN:
case VOID:
case INT:
case ID: {
// Must be a type though there is a possibility of a reference
if(peek(1).type != Token.TYPE.ID || peek(2).type == Token.TYPE.ID
||(peek(2).type == Token.TYPE.LSQUARE && peek(3).type == Token.TYPE.RSQUARE)) {
if (peek(1).type != Token.TYPE.ID
|| peek(2).type == Token.TYPE.ID
|| (peek(2).type == Token.TYPE.LSQUARE && peek(3).type == Token.TYPE.RSQUARE)) {
Type t = parseType();
String name = accept(Token.TYPE.ID).spelling;
VarDecl v = new VarDecl(t, name, t.posn);
@ -373,10 +383,10 @@ public class Parser {
Reference r = parseReference();
// Reference ( ArgumentList? ) ;
if(peek(1).type == Token.TYPE.LPAREN) {
if (peek(1).type == Token.TYPE.LPAREN) {
ExprList e = new ExprList();
accept(Token.TYPE.LPAREN);
if(peek(1).type != Token.TYPE.RPAREN) {
if (peek(1).type != Token.TYPE.RPAREN) {
e = parseArgumentList();
}
accept(Token.TYPE.RPAREN);
@ -397,20 +407,17 @@ public class Parser {
}
/**
* Expression ::=
* Reference
* | Reference ( ArgumentList? )
* | unop Expression
* | ( Expression )
* | num | true | false
* | new (id() | int [ Expression ] | id [ Expression ] )
* Expression ::= Reference | Reference ( ArgumentList? ) | unop Expression
* | ( Expression ) | num | true | false | new (id() | int [ Expression ] |
* id [ Expression ] )
*
* @return
* @throws ScanningException
*/
private Expression parseSingleExpression() throws ParsingException, ScanningException {
Expression e = null;
switch(peek(1).type) {
switch (peek(1).type) {
// num
case NUM: {
@ -440,12 +447,12 @@ public class Parser {
// unop Expression
case UNOP:
case BINOP: {
if(peek(1).spelling.equals("!") || peek(1).spelling.equals("-")) {
if (peek(1).spelling.equals("!") || peek(1).spelling.equals("-")) {
Token opToken = accept(peek(1).type);
Operator o = new Operator(opToken, opToken.posn);
e = new UnaryExpr(o, parseSingleExpression(), opToken.posn);
}
else throw new ParsingException();
} else
throw new ParsingException();
break;
}
@ -453,7 +460,7 @@ public class Parser {
case NEW: {
Token newToken = accept(Token.TYPE.NEW);
if(peek(1).type == Token.TYPE.INT) {
if (peek(1).type == Token.TYPE.INT) {
accept(Token.TYPE.INT);
accept(Token.TYPE.LSQUARE);
Expression e2 = parseExpression();
@ -468,7 +475,7 @@ public class Parser {
Identifier i = new Identifier(id.spelling, id.posn);
ClassType c = new ClassType(i, id.posn);
if(peek(1).type == Token.TYPE.LPAREN){
if (peek(1).type == Token.TYPE.LPAREN) {
accept(Token.TYPE.LPAREN);
accept(Token.TYPE.RPAREN);
e = new NewObjectExpr(c, id.posn);
@ -484,12 +491,13 @@ public class Parser {
}
// Reference ((ArgumentList?))?
case THIS: case ID: {
case THIS:
case ID: {
Reference r = parseReference();
if(peek(1).type == Token.TYPE.LPAREN) {
if (peek(1).type == Token.TYPE.LPAREN) {
accept(Token.TYPE.LPAREN);
ExprList el = new ExprList();
if(peek(1).type != Token.TYPE.RPAREN) {
if (peek(1).type != Token.TYPE.RPAREN) {
el = parseArgumentList();
}
accept(Token.TYPE.RPAREN);
@ -502,22 +510,22 @@ public class Parser {
}
default:
throw new ParsingException();
throw new ParsingException(peek(1));
}
return e;
}
/**
* Disjunction & Initial Call:
* Expression ::= Expression binop Expression
* Disjunction & Initial Call: Expression ::= Expression binop Expression
* @return
* @throws ParsingException
* @throws ScanningException
*/
private Expression parseExpression() throws ParsingException, ScanningException {
Expression e = parseCExpression();
while(peek(1).spelling.equals("||")) {
while (peek(1).spelling.equals("||")) {
Token opToken = accept(Token.TYPE.BINOP);
Operator o = new Operator(opToken, opToken.posn);
e = new BinaryExpr(o, e, parseCExpression(), e.posn);
@ -529,12 +537,13 @@ public class Parser {
/**
* Conjunction
* @return
* @throws ParsingException
* @throws ScanningException
*/
private Expression parseCExpression() throws ParsingException, ScanningException {
Expression e = parseEExpression();
while(peek(1).spelling.equals("&&")) {
while (peek(1).spelling.equals("&&")) {
Token opToken = accept(Token.TYPE.BINOP);
Operator o = new Operator(opToken, opToken.posn);
e = new BinaryExpr(o, e, parseEExpression(), e.posn);
@ -546,12 +555,13 @@ public class Parser {
/**
* Equality
* @return
* @throws ParsingException
* @throws ScanningException
*/
private Expression parseEExpression() throws ParsingException, ScanningException {
Expression e = parseRExpression();
while(peek(1).spelling.equals("==") || peek(1).spelling.equals("!=")) {
while (peek(1).spelling.equals("==") || peek(1).spelling.equals("!=")) {
Token opToken = accept(Token.TYPE.BINOP);
Operator o = new Operator(opToken, opToken.posn);
e = new BinaryExpr(o, e, parseRExpression(), e.posn);
@ -563,13 +573,15 @@ public class Parser {
/**
* Relational
* @return
* @throws ParsingException
* @throws ScanningException
*/
private Expression parseRExpression() throws ParsingException, ScanningException {
Expression e = parseAExpression();
while(peek(1).spelling.equals("<") || peek(1).spelling.equals("<=")
|| peek(1).spelling.equals(">") || peek(1).spelling.equals(">=")) {
while (peek(1).spelling.equals("<") || peek(1).spelling.equals("<=")
|| peek(1).spelling.equals(">")
|| peek(1).spelling.equals(">=")) {
Token opToken = accept(Token.TYPE.BINOP);
Operator o = new Operator(opToken, opToken.posn);
e = new BinaryExpr(o, e, parseAExpression(), e.posn);
@ -581,12 +593,13 @@ public class Parser {
/**
* Additive
* @return
* @throws ParsingException
* @throws ScanningException
*/
private Expression parseAExpression() throws ParsingException, ScanningException {
Expression e = parseMExpression();
while(peek(1).spelling.equals("+") || peek(1).spelling.equals("-")) {
while (peek(1).spelling.equals("+") || peek(1).spelling.equals("-")) {
Token opToken = accept(Token.TYPE.BINOP);
Operator o = new Operator(opToken, opToken.posn);
e = new BinaryExpr(o, e, parseMExpression(), e.posn);
@ -598,12 +611,13 @@ public class Parser {
/**
* Multiplicative
* @return
* @throws ParsingException
* @throws ScanningException
*/
private Expression parseMExpression() throws ParsingException, ScanningException {
Expression e = parseSingleExpression();
while(peek(1).spelling.equals("*") || peek(1).spelling.equals("/")) {
while (peek(1).spelling.equals("*") || peek(1).spelling.equals("/")) {
Token opToken = accept(Token.TYPE.BINOP);
Operator o = new Operator(opToken, opToken.posn);
e = new BinaryExpr(o, e, parseSingleExpression(), e.posn);
@ -614,13 +628,14 @@ public class Parser {
/**
* Sees what the next token is, caching the result.
* @param lookahead
* @return
* @throws ScanningException
*/
private Token peek(int lookahead) throws ScanningException {
// Cache tokens
while(stream.size() < lookahead) {
while (stream.size() < lookahead) {
Token next = scanner.scan();
stream.addLast(next);
}
@ -628,9 +643,11 @@ public class Parser {
return stream.get(lookahead - 1);
}
/**
* Consumes token or throws exception.
* @param type
* @return
* @throws ParsingException
* @throws ScanningException
*/
private Token accept(Token.TYPE type) throws ParsingException, ScanningException {

105
miniJava/src/miniJava/SyntacticAnalyzer/Scanner.java
View File

@ -20,6 +20,7 @@ public class Scanner {
/**
* Scans in input, returning next token.
*
* @return
* @throws IOException
*/
@ -28,16 +29,17 @@ public class Scanner {
String attr = "";
Token token = null;
while(token == null) {
while (token == null) {
// Check for EOF
int c = read();
if(c == -1) return new Token("", Token.TYPE.EOT);
if (c == -1)
return new Token("", Token.TYPE.EOT);
// Setup
attr += (char) c;
switch(c) {
switch (c) {
// Operators
case '*':
@ -45,32 +47,42 @@ public class Scanner {
break;
case '+':
if(peek('+')) throw new ScanningException(col, line);
if (peek('+'))
throw new ScanningException(col, line);
token = new Token(attr, Token.TYPE.BINOP);
break;
case '-':
if(peek('-')) throw new ScanningException(col, line);
if (peek('-'))
throw new ScanningException(col, line);
token = new Token(attr, Token.TYPE.BINOP);
break;
// Check for comment
case '/':
if(peek('*')) { read(); readComment(); attr = ""; }
else if(peek('/')) { readLine(); attr = ""; }
else token = new Token(attr, Token.TYPE.BINOP);
if (peek('*')) {
read();
readComment();
attr = "";
} else if (peek('/')) {
readLine();
attr = "";
} else
token = new Token(attr, Token.TYPE.BINOP);
break;
// Check for c or c=
case '>':
case '<':
if(peek('=')) attr += (char) read();
if (peek('='))
attr += (char) read();
token = new Token(attr, Token.TYPE.BINOP);
break;
// Check for ! or !=
case '!':
if(!peek('=')) token = new Token(attr, Token.TYPE.UNOP);
if (!peek('='))
token = new Token(attr, Token.TYPE.UNOP);
else {
attr += (char) read();
token = new Token(attr, Token.TYPE.BINOP);
@ -80,7 +92,8 @@ public class Scanner {
// Check for && or ||
case '&':
case '|':
if(!peek((char) c)) throw new ScanningException(col, line);
if (!peek((char) c))
throw new ScanningException(col, line);
else {
attr += (char) read();
token = new Token(attr, Token.TYPE.BINOP);
@ -89,7 +102,8 @@ public class Scanner {
// Other Operators
case '=':
if(!peek('=')) token = new Token(attr, Token.TYPE.EQUALS);
if (!peek('='))
token = new Token(attr, Token.TYPE.EQUALS);
else {
attr += (char) read();
token = new Token(attr, Token.TYPE.BINOP);
@ -135,13 +149,13 @@ public class Scanner {
default:
// Identifier or Keyword
if(isAlpha((char) c)) {
for(char n = peek(); isAlpha(n) || isDigit(n);) {
if (isAlpha((char) c)) {
for (char n = peek(); isAlpha(n) || isDigit(n);) {
attr += (char) read();
n = peek();
}
if(Token.keywords.containsKey(attr)) {
if (Token.keywords.containsKey(attr)) {
token = new Token(attr, Token.keywords.get(attr));
} else {
token = new Token(attr, Token.TYPE.ID);
@ -149,8 +163,8 @@ public class Scanner {
}
// Number
else if(isDigit((char) c)) {
for(char n = peek(); isDigit(n);) {
else if (isDigit((char) c)) {
for (char n = peek(); isDigit(n);) {
attr += (char) read();
n = peek();
}
@ -159,12 +173,14 @@ public class Scanner {
}
// Whitespace
else if(isWhitespace((char) c)) {
else if (isWhitespace((char) c)) {
attr = "";
}
// Unrecognized Character
else throw new ScanningException(col, line);;
else
throw new ScanningException(col, line);
;
break;
}
@ -174,9 +190,9 @@ public class Scanner {
return token;
}
/**
* Looks at next character in stream without consuming.
*
* @return
* @throws IOException
*/
@ -187,14 +203,14 @@ public class Scanner {
input.reset();
return next == -1 ? '\0' : (char) next;
} catch(IOException e) {
} catch (IOException e) {
throw new ScanningException(col, line);
}
}
/**
* Returns whether passed character is next in stream.
*
* @param c
* @return
* @throws IOException
@ -206,73 +222,77 @@ public class Scanner {
input.reset();
return c == next;
} catch(IOException e) {
} catch (IOException e) {
throw new ScanningException(col, line);
}
}
/**
* Alternative reading that keeps track of position.
*
* @return
* @throws IOException
*/
private int read() throws ScanningException {
try {
int next = input.read();
if(next != '\n' && next != '\r') col += 1;
if (next != '\n' && next != '\r')
col += 1;
else {
col = 1; line += 1;
if(peek('\r') || peek('\n')) next = input.read();
col = 1;
line += 1;
if (peek('\r') || peek('\n'))
next = input.read();
}
return next;
} catch(IOException e) {
} catch (IOException e) {
throw new ScanningException(col, line);
}
}
/**
* Consumes input until an end of comment has been reached.
*
* @throws IOException
*/
private void readComment() throws ScanningException {
char prev = '\0', current = '\0';
while(prev != '*' || current != '/') {
while (prev != '*' || current != '/') {
prev = current;
int next = read();
if(next == -1) throw new ScanningException(col, line);
else current = (char) next;
if (next == -1)
throw new ScanningException(col, line);
else
current = (char) next;
}
}
/**
* Consumes input until the end of line is reached
*
* @throws IOException
*/
private void readLine() throws ScanningException {
for(int n = 0; n != '\n' && n != '\r' && n != -1; n = read()) {}
for (int n = 0; n != '\n' && n != '\r' && n != -1; n = read()) {
}
}
/**
* Tells whether character is alphabetical.
*
* @param c
* @return
*/
private boolean isAlpha(char c) {
return (c >= 'a' && c <= 'z')
|| (c >= 'A' && c <= 'Z')
|| c == '_';
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '_';
}
/**
* Tells whether character is numerical.
*
* @param c
* @return
*/
@ -280,17 +300,14 @@ public class Scanner {
return c >= '0' && c <= '9';
}
/**
* Tells wheter character is whitespace.
*
* @param c
* @return
*/
private boolean isWhitespace(char c) {
return c == ' '
|| c == '\n'
|| c == '\r'
|| c == '\t';
return c == ' ' || c == '\n' || c == '\r' || c == '\t';
}
}

36
miniJava/src/miniJava/SyntacticAnalyzer/Token.java
View File

@ -7,49 +7,23 @@ public class Token {
public enum TYPE {
// Possible Terminals
ID,
NUM,
UNOP,
BINOP,
ID, NUM, UNOP, BINOP,
// Keywords
IF,
ELSE,
NEW,
INT,
VOID,
THIS,
TRUE,
FALSE,
CLASS,
WHILE,
RETURN,
BOOLEAN,
IF, ELSE, NEW, INT, VOID, THIS, TRUE, FALSE, CLASS, WHILE, RETURN, BOOLEAN,
// Declarators
STATIC,
PUBLIC,
PRIVATE,
STATIC, PUBLIC, PRIVATE,
// Other Terminals
EQUALS,
PERIOD,
COMMA,
LPAREN,
RPAREN,
LSQUARE,
RSQUARE,
LBRACKET,
RBRACKET,
SEMICOLON,
EQUALS, PERIOD, COMMA, LPAREN, RPAREN, LSQUARE, RSQUARE, LBRACKET, RBRACKET, SEMICOLON,
// End of Token Stream
EOT
};
public final static HashMap<String, TYPE> keywords;
static
{
static {
keywords = new HashMap<String, TYPE>();
keywords.put("class", TYPE.CLASS);
keywords.put("return", TYPE.RETURN);

5
miniJava/test.java
View File

@ -1,5 +0,0 @@
class Test {
public int Test() {
}
}