From 78b14c344baec885bc886ae3328f027293e5c716 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Mon, 24 Nov 2025 11:01:07 +0000 Subject: [PATCH 1/9] Initial plan From b6c4611ad90f301cde9bd64882eb0e7f6a1c72e1 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Mon, 24 Nov 2025 11:05:01 +0000 Subject: [PATCH 2/9] Initial commit: Current state only handles Project 3 Co-authored-by: wuzhi456 <217564920+wuzhi456@users.noreply.github.com> --- .../CS323-Compilers-2025F-Projects/Main.class | Bin 828 -> 636 bytes .../TestP4.class | Bin 0 -> 732 bytes .../framework/AbstractCompiler.class | Bin 468 -> 381 bytes .../framework/AbstractGrader.class | Bin 2189 -> 2208 bytes .../framework/Utils.class | Bin 4769 -> 3831 bytes .../framework/lang/Type.class | Bin 311 -> 241 bytes .../framework/project3/Grader.class | Bin 851 -> 578 bytes ...nticError$DefinitionOfIncompleteType.class | Bin 1251 -> 1105 bytes .../Project3SemanticError$MemberError.class | Bin 1281 -> 1140 bytes ...ect3SemanticError$RedeclarationError.class | Bin 1306 -> 1158 bytes ...ject3SemanticError$RedefinitionError.class | Bin 1210 -> 1073 bytes ...ect3SemanticError$UndeclaredUseError.class | Bin 1215 -> 1077 bytes .../project3/Project3SemanticError.class | Bin 1824 -> 1550 bytes .../project4/Project4Exception.class | Bin 0 -> 369 bytes .../project4/Project4SemanticError.class | Bin 0 -> 4592 bytes .../generated/Splc/Splc.interp | 100 ------------- .../generated/Splc/Splc.tokens | 76 ---------- .../generated/Splc/SplcBaseListener.class | Bin 5014 -> 3454 bytes .../generated/Splc/SplcBaseVisitor.class | Bin 4949 -> 3672 bytes .../generated/Splc/SplcLexer.class | Bin 9100 -> 8795 bytes .../generated/Splc/SplcLexer.interp | 140 ------------------ .../generated/Splc/SplcLexer.tokens | 76 ---------- .../generated/Splc/SplcListener.class | Bin 2268 -> 2268 bytes .../Splc/SplcParser$BracketContext.class | Bin 2488 -> 1948 bytes .../Splc/SplcParser$ExprStmtContext.class | Bin 2256 -> 1769 bytes .../Splc/SplcParser$ExpressionContext.class | Bin 4636 -> 3554 bytes .../Splc/SplcParser$FuncArgsContext.class | Bin 3067 -> 2427 bytes .../Splc/SplcParser$GlobalDefContext.class | Bin 3790 -> 3043 bytes .../Splc/SplcParser$IfStmtContext.class | Bin 2826 -> 2233 bytes .../Splc/SplcParser$ProgramContext.class | Bin 2530 -> 1965 bytes .../Splc/SplcParser$ReturnStmtContext.class | Bin 2344 -> 1837 bytes .../Splc/SplcParser$SpecifierContext.class | Bin 3478 -> 2729 bytes .../Splc/SplcParser$StatementContext.class | Bin 935 -> 680 bytes .../Splc/SplcParser$VarDecContext.class | Bin 2645 -> 2005 bytes .../Splc/SplcParser$VarDecStmtContext.class | Bin 2739 -> 2196 bytes .../Splc/SplcParser$WhileStmtContext.class | Bin 2539 -> 1997 bytes .../generated/Splc/SplcParser.class | Bin 23005 -> 21632 bytes .../generated/Splc/SplcVisitor.class | Bin 3013 -> 3013 bytes .../impl/Compiler$ArrayType.class | Bin 1626 -> 1383 bytes .../impl/Compiler$BasicType$Kind.class | Bin 1161 -> 1069 bytes .../impl/Compiler$BasicType.class | Bin 1159 -> 948 bytes .../impl/Compiler$FunctionType.class | Bin 2004 -> 1654 bytes .../impl/Compiler$PointerType.class | Bin 1475 -> 1258 bytes .../impl/Compiler$SemanticAnalyzer.class | Bin 15909 -> 13113 bytes .../impl/Compiler$StructType$Member.class | Bin 606 -> 504 bytes .../impl/Compiler$StructType.class | Bin 3097 -> 2624 bytes .../impl/Compiler$Symbol$Kind.class | Bin 1327 -> 1235 bytes .../impl/Compiler$Symbol.class | Bin 1107 -> 924 bytes .../impl/Compiler$SymbolTable.class | Bin 4664 -> 3671 bytes .../impl/Compiler.class | Bin 3531 -> 3062 bytes 50 files changed, 392 deletions(-) create mode 100644 out/production/CS323-Compilers-2025F-Projects/TestP4.class create mode 100644 out/production/CS323-Compilers-2025F-Projects/framework/project4/Project4Exception.class create mode 100644 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b/out/production/CS323-Compilers-2025F-Projects/generated/Splc/Splc.tokens deleted file mode 100644 index 66553e7..0000000 --- a/out/production/CS323-Compilers-2025F-Projects/generated/Splc/Splc.tokens +++ /dev/null @@ -1,76 +0,0 @@ -INT=1 -CHAR=2 -STRUCT=3 -RETURN=4 -IF=5 -ELSE=6 -WHILE=7 -ASSIGN=8 -PLUS=9 -MINUS=10 -STAR=11 -DIV=12 -MOD=13 -LT=14 -LE=15 -GT=16 -GE=17 -EQ=18 -NEQ=19 -AND=20 -OR=21 -NOT=22 -INC=23 -DEC=24 -DOT=25 -ARROW=26 -AMP=27 -SEMI=28 -COMMA=29 -LPAREN=30 -RPAREN=31 -LBRACE=32 -RBRACE=33 -LBRACK=34 -RBRACK=35 -Identifier=36 -Number=37 -Char=38 -WS=39 -LINE_COMMENT=40 -BLOCK_COMMENT=41 -'int'=1 -'char'=2 -'struct'=3 -'return'=4 -'if'=5 -'else'=6 -'while'=7 -'='=8 -'+'=9 -'-'=10 -'*'=11 -'/'=12 -'%'=13 -'<'=14 -'<='=15 -'>'=16 -'>='=17 -'=='=18 -'!='=19 -'&&'=20 -'||'=21 -'!'=22 -'++'=23 -'--'=24 -'.'=25 -'->'=26 -'&'=27 -';'=28 -','=29 -'('=30 -')'=31 -'{'=32 -'}'=33 -'['=34 -']'=35 diff --git 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262b3ce..ab75cf0 100644 --- a/src/main/java/impl/Compiler.java +++ b/src/main/java/impl/Compiler.java @@ -4,12 +4,15 @@ import framework.AbstractGrader; import framework.lang.Type; import framework.project3.Project3SemanticError; +import framework.project4.Project4SemanticError; +import framework.project4.Project4Exception; import generated.Splc.SplcBaseVisitor; import generated.Splc.SplcLexer; import generated.Splc.SplcParser; import org.antlr.v4.runtime.CharStream; import org.antlr.v4.runtime.CharStreams; import org.antlr.v4.runtime.CommonTokenStream; +import org.antlr.v4.runtime.Token; import org.antlr.v4.runtime.tree.TerminalNode; import java.io.IOException; @@ -36,16 +39,18 @@ public void start() throws IOException { SemanticAnalyzer analyzer = new SemanticAnalyzer(grader); analyzer.visit(program); - // If we get here, no semantic errors were found - // Phase 2: Print global variables and functions - grader.print("Variables:\n"); - for (Symbol symbol : analyzer.getGlobalVariables()) { - grader.print(symbol.getName() + ": " + symbol.getType().fullPrint() + "\n"); - } - grader.print("\n"); - grader.print("Functions:\n"); - for (Symbol symbol : analyzer.getGlobalFunctions()) { - grader.print(symbol.getName() + ": " + symbol.getType().prettyPrint() + "\n"); + // If we get here, no semantic errors were found (or only Project 4 errors) + // Phase 2: Print global variables and functions only if no errors + if (!analyzer.hasSemanticErrors()) { + grader.print("Variables:\n"); + for (Symbol symbol : analyzer.getGlobalVariables()) { + grader.print(symbol.getName() + ": " + symbol.getType().fullPrint() + "\n"); + } + grader.print("\n"); + grader.print("Functions:\n"); + for (Symbol symbol : analyzer.getGlobalFunctions()) { + grader.print(symbol.getName() + ": " + symbol.getType().prettyPrint() + "\n"); + } } } @@ -441,6 +446,17 @@ public List getFileScopeOthers() { // ===== Semantic Analyzer ===== + // Expression info: type + value category + private static class ExprInfo { + public final Type type; + public final boolean isLvalue; + + public ExprInfo(Type type, boolean isLvalue) { + this.type = type; + this.isLvalue = isLvalue; + } + } + private static class SemanticAnalyzer extends SplcBaseVisitor { private final AbstractGrader grader; private final SymbolTable symbolTable; @@ -448,6 +464,8 @@ private static class SemanticAnalyzer extends SplcBaseVisitor { private final List globalFunctions = new ArrayList<>(); private final Map incompleteGlobals = new LinkedHashMap<>(); + private Type currentFunctionReturnType = null; // Track current function's return type + private boolean hasSemanticErrors = false; // Track if any semantic errors occurred public SemanticAnalyzer(AbstractGrader grader) { @@ -463,6 +481,10 @@ public List getGlobalFunctions() { return globalFunctions; } + public boolean hasSemanticErrors() { + return hasSemanticErrors; + } + private List getTagNamesFromType(Type type) { List result = new ArrayList<>(); if (type instanceof StructType) { @@ -561,6 +583,7 @@ public Type visitGlobalDef(SplcParser.GlobalDefContext ctx) { // Enter function scope for parameters and body symbolTable.enterScope(); + currentFunctionReturnType = specType; // Track return type for return statement checking // Add parameters to the function scope if (ctx.funcArgs().specifier() != null && !ctx.funcArgs().specifier().isEmpty()) { @@ -764,16 +787,35 @@ public Type visitVarDecStmt(SplcParser.VarDecStmtContext ctx) { symbolTable.addOther(varName, varType, Symbol.Kind.VARIABLE); - // Visit initialization expression if present + // Visit initialization expression if present and check type compatibility if (ctx.expression() != null) { - visitExpression(ctx.expression()); + try { + ExprInfo exprInfo = checkExpression(ctx.expression()); + if (!typesEqual(varType, exprInfo.type)) { + Project4SemanticError.unexpectedType(ctx.expression(), exprInfo.type).throwException(); + } + } catch (Project4Exception ex) { + hasSemanticErrors = true; + grader.reportSemanticError(ex); + } } return null; } @Override public Type visitIfStmt(SplcParser.IfStmtContext ctx) { - visitExpression(ctx.expression()); + // Check condition type + try { + ExprInfo condInfo = checkExpression(ctx.expression()); + // Condition must be integer or pointer + if (!isIntegerType(condInfo.type) && !isPointerType(condInfo.type)) { + Project4SemanticError.unexpectedType(ctx.expression(), condInfo.type).throwException(); + } + } catch (Project4Exception ex) { + hasSemanticErrors = true; + grader.reportSemanticError(ex); + } + visit(ctx.statement(0)); if (ctx.statement().size() > 1) { visit(ctx.statement(1)); @@ -783,46 +825,461 @@ public Type visitIfStmt(SplcParser.IfStmtContext ctx) { @Override public Type visitWhileStmt(SplcParser.WhileStmtContext ctx) { - visitExpression(ctx.expression()); + // Check condition type + try { + ExprInfo condInfo = checkExpression(ctx.expression()); + // Condition must be integer or pointer + if (!isIntegerType(condInfo.type) && !isPointerType(condInfo.type)) { + Project4SemanticError.unexpectedType(ctx.expression(), condInfo.type).throwException(); + } + } catch (Project4Exception ex) { + hasSemanticErrors = true; + grader.reportSemanticError(ex); + } + visit(ctx.statement()); return null; } @Override public Type visitReturnStmt(SplcParser.ReturnStmtContext ctx) { - visitExpression(ctx.expression()); + // Check return type + try { + ExprInfo exprInfo = checkExpression(ctx.expression()); + if (currentFunctionReturnType != null && !typesEqual(currentFunctionReturnType, exprInfo.type)) { + Project4SemanticError.unexpectedType(ctx.expression(), exprInfo.type).throwException(); + } + } catch (Project4Exception ex) { + hasSemanticErrors = true; + grader.reportSemanticError(ex); + } return null; } @Override public Type visitExprStmt(SplcParser.ExprStmtContext ctx) { - visitExpression(ctx.expression()); + // Just check the expression + try { + checkExpression(ctx.expression()); + } catch (Project4Exception ex) { + hasSemanticErrors = true; + grader.reportSemanticError(ex); + } return null; } - @Override - public Type visitExpression(SplcParser.ExpressionContext ctx) { - // First, check if this expression has an identifier that needs to be looked up - if (ctx.Identifier() != null) { + // ===== Expression Type Checking ===== + + private ExprInfo checkExpression(SplcParser.ExpressionContext ctx) { + // Identifier (but not member access or function call) + if (ctx.Identifier() != null && ctx.LPAREN() == null && ctx.DOT() == null && ctx.ARROW() == null) { String name = ctx.Identifier().getText(); Symbol symbol = symbolTable.lookupOther(name); if (symbol == null) { grader.reportSemanticError(Project3SemanticError.undeclaredUse(ctx.Identifier())); + return new ExprInfo(new BasicType(BasicType.Kind.INT), false); // Error recovery + } + if (symbol.getKind() == Symbol.Kind.FUNCTION || symbol.getKind() == Symbol.Kind.FUNCTION_DECL) { + Project4SemanticError.identifierNotVariable(ctx, name).throwException(); + } + return new ExprInfo(symbol.getType(), true); // Variables are lvalues + } + + // Number + if (ctx.Number() != null) { + return new ExprInfo(new BasicType(BasicType.Kind.INT), false); + } + + // Parenthesized expression + if (ctx.LPAREN() != null && ctx.expression().size() == 1 && ctx.Identifier() == null) { + ExprInfo inner = checkExpression(ctx.expression(0)); + return new ExprInfo(inner.type, inner.isLvalue); + } + + // Function call: Identifier LPAREN (expression (COMMA expression)*)? RPAREN + if (ctx.Identifier() != null && ctx.LPAREN() != null) { + String funcName = ctx.Identifier().getText(); + Symbol symbol = symbolTable.lookupOther(funcName); + if (symbol == null) { + grader.reportSemanticError(Project3SemanticError.undeclaredUse(ctx.Identifier())); + return new ExprInfo(new BasicType(BasicType.Kind.INT), false); + } + if (symbol.getKind() != Symbol.Kind.FUNCTION && symbol.getKind() != Symbol.Kind.FUNCTION_DECL) { + Project4SemanticError.identifierNotFunction(ctx, funcName).throwException(); + } + + FunctionType funcType = (FunctionType) symbol.getType(); + List paramTypes = funcType.getParameterTypes(); + + // Get actual arguments + List args = new ArrayList<>(); + for (int i = 0; i < ctx.expression().size(); i++) { + args.add(ctx.expression(i)); + } + + // Check parameter count + if (args.size() != paramTypes.size()) { + Project4SemanticError.badParamCount(ctx, paramTypes.size(), args.size()).throwException(); + } + + // Check parameter types + for (int i = 0; i < args.size(); i++) { + ExprInfo argInfo = checkExpression(args.get(i)); + if (!typesEqual(paramTypes.get(i), argInfo.type)) { + Project4SemanticError.badParamType(ctx, i + 1).throwException(); + } + } + + return new ExprInfo(funcType.getReturnType(), false); + } + + // Array access: expression LBRACK expression RBRACK + if (ctx.LBRACK() != null) { + ExprInfo arrayInfo = checkExpression(ctx.expression(0)); + ExprInfo indexInfo = checkExpression(ctx.expression(1)); + + // Index must be integer + if (!isIntegerType(indexInfo.type)) { + Project4SemanticError.unexpectedType(ctx, indexInfo.type).throwException(); + } + + Type elementType; + if (arrayInfo.type instanceof ArrayType) { + // If it's an array, it must be an lvalue + if (!arrayInfo.isLvalue) { + Project4SemanticError.unexpectedType(ctx, arrayInfo.type).throwException(); + } + elementType = ((ArrayType) arrayInfo.type).getElementType(); + } else if (arrayInfo.type instanceof PointerType) { + elementType = ((PointerType) arrayInfo.type).getReferencedType(); + } else { + Project4SemanticError.unexpectedType(ctx, arrayInfo.type).throwException(); + return new ExprInfo(new BasicType(BasicType.Kind.INT), true); + } + + return new ExprInfo(elementType, true); // Array access is lvalue + } + + // Struct member access: expression DOT Identifier + if (ctx.DOT() != null) { + ExprInfo structInfo = checkExpression(ctx.expression(0)); + String memberName = ctx.Identifier().getText(); + + if (!(structInfo.type instanceof StructType)) { + Project4SemanticError.unexpectedType(ctx, structInfo.type).throwException(); + return new ExprInfo(new BasicType(BasicType.Kind.INT), true); + } + + if (!structInfo.isLvalue) { + Project4SemanticError.lvalueRequired(ctx).throwException(); + } + + StructType structType = (StructType) structInfo.type; + if (!structType.isComplete()) { + Project4SemanticError.unexpectedType(ctx, structType).throwException(); + return new ExprInfo(new BasicType(BasicType.Kind.INT), true); + } + + // Find member + Type memberType = null; + for (StructType.Member member : structType.getMembers()) { + if (member.name.equals(memberName)) { + memberType = member.type; + break; + } + } + + if (memberType == null) { + Project4SemanticError.badMember(ctx, structType, memberName).throwException(); + return new ExprInfo(new BasicType(BasicType.Kind.INT), true); + } + + return new ExprInfo(memberType, true); // Member access is lvalue + } + + // Struct pointer access: expression ARROW Identifier + if (ctx.ARROW() != null) { + ExprInfo ptrInfo = checkExpression(ctx.expression(0)); + String memberName = ctx.Identifier().getText(); + + if (!(ptrInfo.type instanceof PointerType)) { + Project4SemanticError.unexpectedType(ctx, ptrInfo.type).throwException(); + return new ExprInfo(new BasicType(BasicType.Kind.INT), true); + } + + Type referencedType = ((PointerType) ptrInfo.type).getReferencedType(); + if (!(referencedType instanceof StructType)) { + Project4SemanticError.unexpectedType(ctx, ptrInfo.type).throwException(); + return new ExprInfo(new BasicType(BasicType.Kind.INT), true); + } + + StructType structType = (StructType) referencedType; + if (!structType.isComplete()) { + Project4SemanticError.unexpectedType(ctx, ptrInfo.type).throwException(); + return new ExprInfo(new BasicType(BasicType.Kind.INT), true); + } + + // Find member + Type memberType = null; + for (StructType.Member member : structType.getMembers()) { + if (member.name.equals(memberName)) { + memberType = member.type; + break; + } + } + + if (memberType == null) { + Project4SemanticError.badMember(ctx, structType, memberName).throwException(); + return new ExprInfo(new BasicType(BasicType.Kind.INT), true); + } + + return new ExprInfo(memberType, true); // Member access is lvalue + } + + // Postfix increment/decrement: expression INC/DEC + if (ctx.INC() != null || ctx.DEC() != null) { + if (ctx.expression().size() == 1) { + ExprInfo operandInfo = checkExpression(ctx.expression(0)); + + if (!operandInfo.isLvalue) { + Project4SemanticError.lvalueRequired(ctx).throwException(); + } + + if (!isIntegerType(operandInfo.type) && !isPointerType(operandInfo.type)) { + Project4SemanticError.unexpectedType(ctx, operandInfo.type).throwException(); + } + + return new ExprInfo(operandInfo.type, false); // Result is rvalue } } - // Visit all sub-expressions - for (int i = 0; i < ctx.getChildCount(); i++) { - if (ctx.getChild(i) instanceof SplcParser.ExpressionContext) { - visitExpression((SplcParser.ExpressionContext) ctx.getChild(i)); + // Prefix unary operators + if (ctx.expression().size() == 1) { + // Prefix increment/decrement + if ((ctx.INC() != null || ctx.DEC() != null) && ctx.expression().size() == 1) { + ExprInfo operandInfo = checkExpression(ctx.expression(0)); + + if (!operandInfo.isLvalue) { + Project4SemanticError.lvalueRequired(ctx).throwException(); + } + + if (!isIntegerType(operandInfo.type) && !isPointerType(operandInfo.type)) { + Project4SemanticError.unexpectedType(ctx, operandInfo.type).throwException(); + } + + return new ExprInfo(operandInfo.type, false); // Result is rvalue + } + + // Unary plus/minus + if (ctx.PLUS() != null || ctx.MINUS() != null) { + ExprInfo operandInfo = checkExpression(ctx.expression(0)); + + if (!isIntegerType(operandInfo.type)) { + Project4SemanticError.unexpectedType(ctx, operandInfo.type).throwException(); + } + + return new ExprInfo(new BasicType(BasicType.Kind.INT), false); + } + + // Logical NOT + if (ctx.NOT() != null) { + ExprInfo operandInfo = checkExpression(ctx.expression(0)); + + if (!isIntegerType(operandInfo.type) && !isPointerType(operandInfo.type)) { + Project4SemanticError.unexpectedType(ctx, operandInfo.type).throwException(); + } + + return new ExprInfo(new BasicType(BasicType.Kind.INT), false); + } + + // Dereference: STAR expression + if (ctx.STAR() != null) { + ExprInfo operandInfo = checkExpression(ctx.expression(0)); + + if (!(operandInfo.type instanceof PointerType)) { + Project4SemanticError.unexpectedType(ctx, operandInfo.type).throwException(); + return new ExprInfo(new BasicType(BasicType.Kind.INT), true); + } + + Type referencedType = ((PointerType) operandInfo.type).getReferencedType(); + return new ExprInfo(referencedType, true); // Dereference is lvalue + } + + // Address-of: AMP expression + if (ctx.AMP() != null) { + ExprInfo operandInfo = checkExpression(ctx.expression(0)); + + if (!operandInfo.isLvalue) { + Project4SemanticError.lvalueRequired(ctx).throwException(); + } + + Type ptrType = new PointerType(operandInfo.type); + return new ExprInfo(ptrType, false); // Address-of is rvalue + } + } + + // Binary operators + if (ctx.expression().size() == 2) { + ExprInfo lhs = checkExpression(ctx.expression(0)); + ExprInfo rhs = checkExpression(ctx.expression(1)); + + // Arithmetic: *, /, % + if (ctx.STAR() != null || ctx.DIV() != null || ctx.MOD() != null) { + if (!isIntegerType(lhs.type)) { + Project4SemanticError.unexpectedType(ctx, lhs.type).throwException(); + } + if (!isIntegerType(rhs.type)) { + Project4SemanticError.unexpectedType(ctx, rhs.type).throwException(); + } + return new ExprInfo(new BasicType(BasicType.Kind.INT), false); + } + + // Addition/Subtraction + if (ctx.PLUS() != null || ctx.MINUS() != null) { + Token op = ctx.PLUS() != null ? ctx.PLUS().getSymbol() : ctx.MINUS().getSymbol(); + + // Both integer + if (isIntegerType(lhs.type) && isIntegerType(rhs.type)) { + return new ExprInfo(new BasicType(BasicType.Kind.INT), false); + } + + // Pointer + integer or integer + pointer (for addition only) + if (ctx.PLUS() != null) { + if (isPointerType(lhs.type) && isIntegerType(rhs.type)) { + return new ExprInfo(lhs.type, false); + } + if (isIntegerType(lhs.type) && isPointerType(rhs.type)) { + return new ExprInfo(rhs.type, false); + } + } + + // Pointer - integer + if (ctx.MINUS() != null) { + if (isPointerType(lhs.type) && isIntegerType(rhs.type)) { + return new ExprInfo(lhs.type, false); + } + // Pointer - pointer + if (isPointerType(lhs.type) && isPointerType(rhs.type)) { + if (!typesEqual(lhs.type, rhs.type)) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx, op, lhs.type, rhs.type).throwException(); + } + return new ExprInfo(new BasicType(BasicType.Kind.INT), false); + } + } + + Project4SemanticError.unmatchedTypeForBinaryOP(ctx, op, lhs.type, rhs.type).throwException(); + } + + // Comparison: <, <=, >, >= + if (ctx.LT() != null || ctx.LE() != null || ctx.GT() != null || ctx.GE() != null) { + if (!isIntegerType(lhs.type)) { + Project4SemanticError.unexpectedType(ctx, lhs.type).throwException(); + } + if (!isIntegerType(rhs.type)) { + Project4SemanticError.unexpectedType(ctx, rhs.type).throwException(); + } + return new ExprInfo(new BasicType(BasicType.Kind.INT), false); + } + + // Equality: ==, != + if (ctx.EQ() != null || ctx.NEQ() != null) { + Token op = ctx.EQ() != null ? ctx.EQ().getSymbol() : ctx.NEQ().getSymbol(); + + // Check if both are integers or pointers + if (!isIntegerType(lhs.type) && !isPointerType(lhs.type)) { + Project4SemanticError.unexpectedType(ctx, lhs.type).throwException(); + } + if (!isIntegerType(rhs.type) && !isPointerType(rhs.type)) { + Project4SemanticError.unexpectedType(ctx, rhs.type).throwException(); + } + + // Special case: allow 0 as null pointer + boolean lhsIsZero = isConstantZero(ctx.expression(0)); + boolean rhsIsZero = isConstantZero(ctx.expression(1)); + + if (!lhsIsZero && !rhsIsZero && !typesEqual(lhs.type, rhs.type)) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx, op, lhs.type, rhs.type).throwException(); + } + + return new ExprInfo(new BasicType(BasicType.Kind.INT), false); + } + + // Logical: &&, || + if (ctx.AND() != null || ctx.OR() != null) { + if (!isIntegerType(lhs.type) && !isPointerType(lhs.type)) { + Project4SemanticError.unexpectedType(ctx, lhs.type).throwException(); + } + if (!isIntegerType(rhs.type) && !isPointerType(rhs.type)) { + Project4SemanticError.unexpectedType(ctx, rhs.type).throwException(); + } + return new ExprInfo(new BasicType(BasicType.Kind.INT), false); + } + + // Assignment: = + if (ctx.ASSIGN() != null) { + if (!lhs.isLvalue) { + Project4SemanticError.lvalueRequired(ctx).throwException(); + } + + // Check if lhs or rhs is array type - arrays cannot be assigned + if (lhs.type instanceof ArrayType || rhs.type instanceof ArrayType) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx, ctx.ASSIGN().getSymbol(), lhs.type, rhs.type).throwException(); + } + + if (!isIntegerType(lhs.type) && !isPointerType(lhs.type)) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx, ctx.ASSIGN().getSymbol(), lhs.type, rhs.type).throwException(); + } + if (!isIntegerType(rhs.type) && !isPointerType(rhs.type)) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx, ctx.ASSIGN().getSymbol(), lhs.type, rhs.type).throwException(); + } + + // Special case: allow 0 as null pointer + boolean rhsIsZero = isConstantZero(ctx.expression(1)); + + if (!rhsIsZero && !typesEqual(lhs.type, rhs.type)) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx, ctx.ASSIGN().getSymbol(), lhs.type, rhs.type).throwException(); + } + + return new ExprInfo(rhs.type, false); // Assignment returns rvalue } } + // Should not reach here + return new ExprInfo(new BasicType(BasicType.Kind.INT), false); + } + + @Override + public Type visitExpression(SplcParser.ExpressionContext ctx) { + // This should not be used in Project 4, but keep for compatibility return null; } // Helper methods + private boolean isConstantZero(SplcParser.ExpressionContext ctx) { + // Check if expression is directly 0 (optionally wrapped in parentheses) + if (ctx.Number() != null && ctx.Number().getText().equals("0")) { + return true; + } + // Check if it's parenthesized zero + if (ctx.LPAREN() != null && ctx.expression().size() == 1 && ctx.Identifier() == null) { + return isConstantZero(ctx.expression(0)); + } + return false; + } + + private boolean isIntegerType(Type type) { + return type instanceof BasicType && ((BasicType) type).getKind() == BasicType.Kind.INT; + } + + private boolean isPointerType(Type type) { + return type instanceof PointerType; + } + + private boolean typesEqual(Type t1, Type t2) { + return t1.equals(t2); + } + private String extractIdentifierFromVarDec(SplcParser.VarDecContext ctx) { if (ctx.Identifier() != null) { return ctx.Identifier().getText(); From 5b3fc7d30de288698b3bac676d56060594f9db9c Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Mon, 24 Nov 2025 11:16:52 +0000 Subject: [PATCH 4/9] Address code review feedback and finalize implementation Co-authored-by: wuzhi456 <217564920+wuzhi456@users.noreply.github.com> --- .../CS323-Compilers-2025F-Projects/Main.class | Bin 636 -> 0 bytes .../CS323-Compilers-2025F-Projects/TestP4.class | Bin 732 -> 0 bytes .../framework/AbstractCompiler.class | Bin 381 -> 0 bytes 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variable declarations (int *p1, *p2;) Co-authored-by: wuzhi456 <217564920+wuzhi456@users.noreply.github.com> --- Splc.g4 | 14 +-- src/main/java/impl/Compiler.java | 161 ++++++++++++++++++++----------- 2 files changed, 113 insertions(+), 62 deletions(-) diff --git a/Splc.g4 b/Splc.g4 index 47d0dfb..183d39e 100644 --- a/Splc.g4 +++ b/Splc.g4 @@ -16,7 +16,7 @@ program: globalDef* EOF; globalDef : specifier Identifier LPAREN funcArgs RPAREN LBRACE statement* RBRACE // function definition - | specifier varDec (ASSIGN expression)? SEMI // global variable definition + | specifier varDec (ASSIGN expression)? (COMMA varDec (ASSIGN expression)?)* SEMI // global variable definition | specifier Identifier LPAREN funcArgs RPAREN SEMI | specifier SEMI // global struct declaration ; @@ -40,12 +40,12 @@ funcArgs ; statement - : LBRACE statement* RBRACE #bracket - | specifier varDec (ASSIGN expression)? SEMI #VarDecStmt - | IF LPAREN expression RPAREN statement (ELSE statement)? #IfStmt - | WHILE LPAREN expression RPAREN statement #WhileStmt - | RETURN expression SEMI #ReturnStmt - | expression SEMI #ExprStmt + : LBRACE statement* RBRACE #bracket + | specifier varDec (ASSIGN expression)? (COMMA varDec (ASSIGN expression)?)* SEMI #VarDecStmt + | IF LPAREN expression RPAREN statement (ELSE statement)? #IfStmt + | WHILE LPAREN expression RPAREN statement #WhileStmt + | RETURN expression SEMI #ReturnStmt + | expression SEMI #ExprStmt ; expression diff --git a/src/main/java/impl/Compiler.java b/src/main/java/impl/Compiler.java index c9fbe46..162822a 100644 --- a/src/main/java/impl/Compiler.java +++ b/src/main/java/impl/Compiler.java @@ -13,6 +13,7 @@ import org.antlr.v4.runtime.CharStreams; import org.antlr.v4.runtime.CommonTokenStream; import org.antlr.v4.runtime.Token; +import org.antlr.v4.runtime.tree.ParseTree; import org.antlr.v4.runtime.tree.TerminalNode; import java.io.IOException; @@ -613,44 +614,61 @@ public Type visitGlobalDef(SplcParser.GlobalDefContext ctx) { symbolTable.exitScope(); - } else if (ctx.varDec() != null) { - // Global variable definition: specifier varDec (ASSIGN expression)? SEMI - String varName = extractIdentifierFromVarDec(ctx.varDec()); - Type varType = buildTypeFromVarDec(ctx.varDec(), specType); - - if (!symbolTable.addOther(varName, varType, Symbol.Kind.VARIABLE)) { - grader.reportSemanticError(Project3SemanticError.redefinition(getIdentifierNode(ctx.varDec()))); + } else if (ctx.varDec() != null && !ctx.varDec().isEmpty()) { + // Global variable definition: specifier varDec (ASSIGN expression)? (COMMA varDec (ASSIGN expression)?)* SEMI + List varDecs = ctx.varDec(); + List expressions = ctx.expression(); + + // Map each varDec to its initialization expression (if any) + // by walking through children in order + Map varDecToExprIndex = new HashMap<>(); + int currentVarDecIndex = -1; + int currentExprIndex = 0; + + for (int i = 0; i < ctx.getChildCount(); i++) { + ParseTree child = ctx.getChild(i); + if (child instanceof SplcParser.VarDecContext) { + currentVarDecIndex++; + } else if (child instanceof TerminalNode) { + TerminalNode tn = (TerminalNode) child; + if (tn.getSymbol().getType() == SplcLexer.ASSIGN && currentVarDecIndex >= 0) { + // The next expression belongs to the current varDec + if (currentExprIndex < expressions.size()) { + varDecToExprIndex.put(currentVarDecIndex, currentExprIndex); + currentExprIndex++; + } + } + } } - globalVariables.add(new Symbol(varName, varType, Symbol.Kind.VARIABLE, 0)); - + + for (int i = 0; i < varDecs.size(); i++) { + SplcParser.VarDecContext varDecCtx = varDecs.get(i); + String varName = extractIdentifierFromVarDec(varDecCtx); + Type varType = buildTypeFromVarDec(varDecCtx, specType); - // Check for incomplete type - if (!isCompleteType(varType)) { - // For arrays, the element type must be complete immediately - // For direct struct types, we can defer the check per v4 spec - if (requiresImmediateCompletenessCheck(varType)) { - if (!isCompleteType(varType)) { - grader.reportSemanticError(Project3SemanticError.definitionIncomplete(getIdentifierNode(ctx.varDec()))); + if (!symbolTable.addOther(varName, varType, Symbol.Kind.VARIABLE)) { + grader.reportSemanticError(Project3SemanticError.redefinition(getIdentifierNode(varDecCtx))); + } + globalVariables.add(new Symbol(varName, varType, Symbol.Kind.VARIABLE, 0)); + + + // Check for incomplete type + if (!isCompleteType(varType)) { + // For arrays, the element type must be complete immediately + // For direct struct types, we can defer the check per v4 spec + if (requiresImmediateCompletenessCheck(varType)) { + grader.reportSemanticError(Project3SemanticError.definitionIncomplete(getIdentifierNode(varDecCtx))); + } else { + // Defer check for direct struct types + incompleteGlobals.put(new Symbol(varName, varType, Symbol.Kind.VARIABLE, 0), getIdentifierNode(varDecCtx)); } - } else if (!isCompleteType(varType)) { - // Defer check for direct struct types - incompleteGlobals.put(new Symbol(varName, varType, Symbol.Kind.VARIABLE, 0), getIdentifierNode(ctx.varDec())); } + + // Note: initialization expressions are checked but global variables + // in this grammar don't need type checking for init expressions + // as per Project 4 spec (only local variables need this check) } - // Check redefinition -// if (symbolTable.existsInCurrentScopeOther(varName)) { -// grader.reportSemanticError(Project3SemanticError.redefinition(getIdentifierNode(ctx.varDec()))); -// } - // 查 file scope，变量/函数/声明同名都不行 -// for (Symbol s : symbolTable.getFileScopeOthers()) { -// if (s.getName().equals(varName)) { -// grader.reportSemanticError(Project3SemanticError.redefinition(getIdentifierNode(ctx.varDec()))); -// break; -// } -// } - - } else if (ctx.Identifier() != null && ctx.funcArgs() != null) { // Function declaration: specifier Identifier LPAREN funcArgs RPAREN SEMI TerminalNode funcName = ctx.Identifier(); @@ -768,35 +786,68 @@ public Type visitBracket(SplcParser.BracketContext ctx) { @Override public Type visitVarDecStmt(SplcParser.VarDecStmtContext ctx) { - // Local variable declaration: specifier varDec (ASSIGN expression)? SEMI + // Local variable declaration: specifier varDec (ASSIGN expression)? (COMMA varDec (ASSIGN expression)?)* SEMI Type specType = visitSpecifier(ctx.specifier()); - String varName = extractIdentifierFromVarDec(ctx.varDec()); - Type varType = buildTypeFromVarDec(ctx.varDec(), specType); - - // Check for incomplete type - if (!isCompleteType(varType)) { - grader.reportSemanticError(Project3SemanticError.definitionIncomplete( - getIdentifierNode(ctx.varDec()))); + + // Process variable declarations by iterating through children in order + // The structure is: specifier (varDec (ASSIGN expression)? (COMMA varDec (ASSIGN expression)?)*)+ SEMI + List varDecs = ctx.varDec(); + List expressions = ctx.expression(); + + // Map each varDec to its initialization expression (if any) + // by walking through children in order + Map varDecToExprIndex = new HashMap<>(); + int currentVarDecIndex = -1; + int currentExprIndex = 0; + + for (int i = 0; i < ctx.getChildCount(); i++) { + ParseTree child = ctx.getChild(i); + if (child instanceof SplcParser.VarDecContext) { + currentVarDecIndex++; + } else if (child instanceof TerminalNode) { + TerminalNode tn = (TerminalNode) child; + if (tn.getSymbol().getType() == SplcLexer.ASSIGN && currentVarDecIndex >= 0) { + // The next expression belongs to the current varDec + if (currentExprIndex < expressions.size()) { + varDecToExprIndex.put(currentVarDecIndex, currentExprIndex); + currentExprIndex++; + } + } + } } + + // Now process each varDec + for (int i = 0; i < varDecs.size(); i++) { + SplcParser.VarDecContext varDecCtx = varDecs.get(i); + String varName = extractIdentifierFromVarDec(varDecCtx); + Type varType = buildTypeFromVarDec(varDecCtx, specType); - // Check redefinition in current scope - if (symbolTable.existsInCurrentScopeOther(varName)) { - grader.reportSemanticError(Project3SemanticError.redefinition( - getIdentifierNode(ctx.varDec()))); - } + // Check for incomplete type + if (!isCompleteType(varType)) { + grader.reportSemanticError(Project3SemanticError.definitionIncomplete( + getIdentifierNode(varDecCtx))); + } - symbolTable.addOther(varName, varType, Symbol.Kind.VARIABLE); + // Check redefinition in current scope + if (symbolTable.existsInCurrentScopeOther(varName)) { + grader.reportSemanticError(Project3SemanticError.redefinition( + getIdentifierNode(varDecCtx))); + } + + symbolTable.addOther(varName, varType, Symbol.Kind.VARIABLE); - // Visit initialization expression if present and check type compatibility - if (ctx.expression() != null) { - try { - ExprInfo exprInfo = checkExpression(ctx.expression()); - if (!typesEqual(varType, exprInfo.type)) { - Project4SemanticError.unexpectedType(ctx.expression(), exprInfo.type).throwException(); + // Check initialization expression if present + if (varDecToExprIndex.containsKey(i)) { + int exprIndex = varDecToExprIndex.get(i); + try { + ExprInfo exprInfo = checkExpression(expressions.get(exprIndex)); + if (!typesEqual(varType, exprInfo.type)) { + Project4SemanticError.unexpectedType(expressions.get(exprIndex), exprInfo.type).throwException(); + } + } catch (Project4Exception ex) { + hasSemanticErrors = true; + grader.reportSemanticError(ex); } - } catch (Project4Exception ex) { - hasSemanticErrors = true; - grader.reportSemanticError(ex); } } return null; From cb0ad243f07681ebf144ebb913dcec557bb4fb7a Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 27 Nov 2025 11:52:23 +0000 Subject: [PATCH 6/9] Fix structure tag scope to always be file scope per C standard Co-authored-by: wuzhi456 <217564920+wuzhi456@users.noreply.github.com> --- src/main/java/impl/Compiler.java | 50 +++++++++++++++++++++++++------- 1 file changed, 39 insertions(+), 11 deletions(-) diff --git a/src/main/java/impl/Compiler.java b/src/main/java/impl/Compiler.java index 162822a..83e3d1b 100644 --- a/src/main/java/impl/Compiler.java +++ b/src/main/java/impl/Compiler.java @@ -330,6 +330,7 @@ private static class SymbolTable { private final Deque> otherScopes = new ArrayDeque<>(); // variables, functions private final Deque> tagScopes = new ArrayDeque<>(); // struct tags + private static final int FILE_SCOPE_ID = 0; private int scopeIdCounter = 0; private int currentScopeId = 0; @@ -371,20 +372,27 @@ public void updateOther(String name, Type type, Symbol.Kind kind) { currentScope.put(name, new Symbol(name, type, kind, currentScopeId)); } - // Add symbol to "tag" namespace (struct tags) + // Add symbol to "tag" namespace (struct tags) - always at file scope public boolean addTag(String name, Type type) { - Map currentScope = tagScopes.peek(); - if (currentScope.containsKey(name)) { - return false; // Already exists in current scope + // Structure tags always have file scope per C standard + Map fileScope = getFileTagScope(); + if (fileScope.containsKey(name)) { + return false; // Already exists in file scope } - currentScope.put(name, new Symbol(name, type, Symbol.Kind.STRUCT_TAG, currentScopeId)); + fileScope.put(name, new Symbol(name, type, Symbol.Kind.STRUCT_TAG, FILE_SCOPE_ID)); return true; } - // Update existing tag in current scope (for completing incomplete structs) + // Update existing tag at file scope (for completing incomplete structs) public void updateTag(String name, Type type) { - Map currentScope = tagScopes.peek(); - currentScope.put(name, new Symbol(name, type, Symbol.Kind.STRUCT_TAG, currentScopeId)); + // Structure tags always have file scope per C standard + Map fileScope = getFileTagScope(); + fileScope.put(name, new Symbol(name, type, Symbol.Kind.STRUCT_TAG, FILE_SCOPE_ID)); + } + + // Get file scope for tags (bottom of the stack) - O(1) access + private Map getFileTagScope() { + return ((ArrayDeque>) tagScopes).peekLast(); } // Lookup in "other" namespace @@ -429,7 +437,9 @@ public boolean existsInCurrentScopeOther(String name) { } public boolean existsInCurrentScopeTag(String name) { - return tagScopes.peek().containsKey(name); + // Structure tags always have file scope + Map fileScope = getFileTagScope(); + return fileScope.containsKey(name); } // Get all symbols in file scope (for printing at the end) @@ -1025,7 +1035,16 @@ private ExprInfo checkExpression(SplcParser.ExpressionContext ctx) { Project4SemanticError.lvalueRequired(ctx).throwException(); } - StructType structType = (StructType) structInfo.type; + // Look up the struct type by tag to get the current (possibly completed) definition + StructType embeddedStructType = (StructType) structInfo.type; + Symbol currentTagSymbol = symbolTable.lookupTag(embeddedStructType.getTag()); + StructType structType; + if (currentTagSymbol != null && currentTagSymbol.getType() instanceof StructType) { + structType = (StructType) currentTagSymbol.getType(); + } else { + structType = embeddedStructType; + } + if (!structType.isComplete()) { Project4SemanticError.unexpectedType(ctx, structType).throwException(); return new ExprInfo(new BasicType(BasicType.Kind.INT), true); @@ -1064,7 +1083,16 @@ private ExprInfo checkExpression(SplcParser.ExpressionContext ctx) { return new ExprInfo(new BasicType(BasicType.Kind.INT), true); } - StructType structType = (StructType) referencedType; + // Look up the struct type by tag to get the current (possibly completed) definition + StructType embeddedStructType = (StructType) referencedType; + Symbol currentTagSymbol = symbolTable.lookupTag(embeddedStructType.getTag()); + StructType structType; + if (currentTagSymbol != null && currentTagSymbol.getType() instanceof StructType) { + structType = (StructType) currentTagSymbol.getType(); + } else { + structType = embeddedStructType; + } + if (!structType.isComplete()) { Project4SemanticError.unexpectedType(ctx, ptrInfo.type).throwException(); return new ExprInfo(new BasicType(BasicType.Kind.INT), true); From 11d1c4a9fb66d20ae2272430d75bca3d4bfa3aa1 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 27 Nov 2025 12:13:54 +0000 Subject: [PATCH 7/9] Revert grammar to original (no comma-separated variable declarations) Co-authored-by: wuzhi456 <217564920+wuzhi456@users.noreply.github.com> --- Splc.g4 | 14 +-- src/main/java/impl/Compiler.java | 146 +++++++++---------------------- 2 files changed, 47 insertions(+), 113 deletions(-) diff --git a/Splc.g4 b/Splc.g4 index 183d39e..47d0dfb 100644 --- a/Splc.g4 +++ b/Splc.g4 @@ -16,7 +16,7 @@ program: globalDef* EOF; globalDef : specifier Identifier LPAREN funcArgs RPAREN LBRACE statement* RBRACE // function definition - | specifier varDec (ASSIGN expression)? (COMMA varDec (ASSIGN expression)?)* SEMI // global variable definition + | specifier varDec (ASSIGN expression)? SEMI // global variable definition | specifier Identifier LPAREN funcArgs RPAREN SEMI | specifier SEMI // global struct declaration ; @@ -40,12 +40,12 @@ funcArgs ; statement - : LBRACE statement* RBRACE #bracket - | specifier varDec (ASSIGN expression)? (COMMA varDec (ASSIGN expression)?)* SEMI #VarDecStmt - | IF LPAREN expression RPAREN statement (ELSE statement)? #IfStmt - | WHILE LPAREN expression RPAREN statement #WhileStmt - | RETURN expression SEMI #ReturnStmt - | expression SEMI #ExprStmt + : LBRACE statement* RBRACE #bracket + | specifier varDec (ASSIGN expression)? SEMI #VarDecStmt + | IF LPAREN expression RPAREN statement (ELSE statement)? #IfStmt + | WHILE LPAREN expression RPAREN statement #WhileStmt + | RETURN expression SEMI #ReturnStmt + | expression SEMI #ExprStmt ; expression diff --git a/src/main/java/impl/Compiler.java b/src/main/java/impl/Compiler.java index 83e3d1b..0dca168 100644 --- a/src/main/java/impl/Compiler.java +++ b/src/main/java/impl/Compiler.java @@ -624,59 +624,26 @@ public Type visitGlobalDef(SplcParser.GlobalDefContext ctx) { symbolTable.exitScope(); - } else if (ctx.varDec() != null && !ctx.varDec().isEmpty()) { - // Global variable definition: specifier varDec (ASSIGN expression)? (COMMA varDec (ASSIGN expression)?)* SEMI - List varDecs = ctx.varDec(); - List expressions = ctx.expression(); - - // Map each varDec to its initialization expression (if any) - // by walking through children in order - Map varDecToExprIndex = new HashMap<>(); - int currentVarDecIndex = -1; - int currentExprIndex = 0; - - for (int i = 0; i < ctx.getChildCount(); i++) { - ParseTree child = ctx.getChild(i); - if (child instanceof SplcParser.VarDecContext) { - currentVarDecIndex++; - } else if (child instanceof TerminalNode) { - TerminalNode tn = (TerminalNode) child; - if (tn.getSymbol().getType() == SplcLexer.ASSIGN && currentVarDecIndex >= 0) { - // The next expression belongs to the current varDec - if (currentExprIndex < expressions.size()) { - varDecToExprIndex.put(currentVarDecIndex, currentExprIndex); - currentExprIndex++; - } - } - } + } else if (ctx.varDec() != null) { + // Global variable definition: specifier varDec (ASSIGN expression)? SEMI + String varName = extractIdentifierFromVarDec(ctx.varDec()); + Type varType = buildTypeFromVarDec(ctx.varDec(), specType); + + if (!symbolTable.addOther(varName, varType, Symbol.Kind.VARIABLE)) { + grader.reportSemanticError(Project3SemanticError.redefinition(getIdentifierNode(ctx.varDec()))); } - - for (int i = 0; i < varDecs.size(); i++) { - SplcParser.VarDecContext varDecCtx = varDecs.get(i); - String varName = extractIdentifierFromVarDec(varDecCtx); - Type varType = buildTypeFromVarDec(varDecCtx, specType); + globalVariables.add(new Symbol(varName, varType, Symbol.Kind.VARIABLE, 0)); - if (!symbolTable.addOther(varName, varType, Symbol.Kind.VARIABLE)) { - grader.reportSemanticError(Project3SemanticError.redefinition(getIdentifierNode(varDecCtx))); - } - globalVariables.add(new Symbol(varName, varType, Symbol.Kind.VARIABLE, 0)); - - - // Check for incomplete type - if (!isCompleteType(varType)) { - // For arrays, the element type must be complete immediately - // For direct struct types, we can defer the check per v4 spec - if (requiresImmediateCompletenessCheck(varType)) { - grader.reportSemanticError(Project3SemanticError.definitionIncomplete(getIdentifierNode(varDecCtx))); - } else { - // Defer check for direct struct types - incompleteGlobals.put(new Symbol(varName, varType, Symbol.Kind.VARIABLE, 0), getIdentifierNode(varDecCtx)); - } + // Check for incomplete type + if (!isCompleteType(varType)) { + // For arrays, the element type must be complete immediately + // For direct struct types, we can defer the check per v4 spec + if (requiresImmediateCompletenessCheck(varType)) { + grader.reportSemanticError(Project3SemanticError.definitionIncomplete(getIdentifierNode(ctx.varDec()))); + } else { + // Defer check for direct struct types + incompleteGlobals.put(new Symbol(varName, varType, Symbol.Kind.VARIABLE, 0), getIdentifierNode(ctx.varDec())); } - - // Note: initialization expressions are checked but global variables - // in this grammar don't need type checking for init expressions - // as per Project 4 spec (only local variables need this check) } } else if (ctx.Identifier() != null && ctx.funcArgs() != null) { @@ -796,68 +763,35 @@ public Type visitBracket(SplcParser.BracketContext ctx) { @Override public Type visitVarDecStmt(SplcParser.VarDecStmtContext ctx) { - // Local variable declaration: specifier varDec (ASSIGN expression)? (COMMA varDec (ASSIGN expression)?)* SEMI + // Local variable declaration: specifier varDec (ASSIGN expression)? SEMI Type specType = visitSpecifier(ctx.specifier()); - - // Process variable declarations by iterating through children in order - // The structure is: specifier (varDec (ASSIGN expression)? (COMMA varDec (ASSIGN expression)?)*)+ SEMI - List varDecs = ctx.varDec(); - List expressions = ctx.expression(); - - // Map each varDec to its initialization expression (if any) - // by walking through children in order - Map varDecToExprIndex = new HashMap<>(); - int currentVarDecIndex = -1; - int currentExprIndex = 0; - - for (int i = 0; i < ctx.getChildCount(); i++) { - ParseTree child = ctx.getChild(i); - if (child instanceof SplcParser.VarDecContext) { - currentVarDecIndex++; - } else if (child instanceof TerminalNode) { - TerminalNode tn = (TerminalNode) child; - if (tn.getSymbol().getType() == SplcLexer.ASSIGN && currentVarDecIndex >= 0) { - // The next expression belongs to the current varDec - if (currentExprIndex < expressions.size()) { - varDecToExprIndex.put(currentVarDecIndex, currentExprIndex); - currentExprIndex++; - } - } - } - } - - // Now process each varDec - for (int i = 0; i < varDecs.size(); i++) { - SplcParser.VarDecContext varDecCtx = varDecs.get(i); - String varName = extractIdentifierFromVarDec(varDecCtx); - Type varType = buildTypeFromVarDec(varDecCtx, specType); + String varName = extractIdentifierFromVarDec(ctx.varDec()); + Type varType = buildTypeFromVarDec(ctx.varDec(), specType); - // Check for incomplete type - if (!isCompleteType(varType)) { - grader.reportSemanticError(Project3SemanticError.definitionIncomplete( - getIdentifierNode(varDecCtx))); - } + // Check for incomplete type + if (!isCompleteType(varType)) { + grader.reportSemanticError(Project3SemanticError.definitionIncomplete( + getIdentifierNode(ctx.varDec()))); + } - // Check redefinition in current scope - if (symbolTable.existsInCurrentScopeOther(varName)) { - grader.reportSemanticError(Project3SemanticError.redefinition( - getIdentifierNode(varDecCtx))); - } + // Check redefinition in current scope + if (symbolTable.existsInCurrentScopeOther(varName)) { + grader.reportSemanticError(Project3SemanticError.redefinition( + getIdentifierNode(ctx.varDec()))); + } - symbolTable.addOther(varName, varType, Symbol.Kind.VARIABLE); + symbolTable.addOther(varName, varType, Symbol.Kind.VARIABLE); - // Check initialization expression if present - if (varDecToExprIndex.containsKey(i)) { - int exprIndex = varDecToExprIndex.get(i); - try { - ExprInfo exprInfo = checkExpression(expressions.get(exprIndex)); - if (!typesEqual(varType, exprInfo.type)) { - Project4SemanticError.unexpectedType(expressions.get(exprIndex), exprInfo.type).throwException(); - } - } catch (Project4Exception ex) { - hasSemanticErrors = true; - grader.reportSemanticError(ex); + // Visit initialization expression if present and check type compatibility + if (ctx.expression() != null) { + try { + ExprInfo exprInfo = checkExpression(ctx.expression()); + if (!typesEqual(varType, exprInfo.type)) { + Project4SemanticError.unexpectedType(ctx.expression(), exprInfo.type).throwException(); } + } catch (Project4Exception ex) { + hasSemanticErrors = true; + grader.reportSemanticError(ex); } } return null; From 6172f6d6c3634ef8ceb8e9df108e2abbe272ccbc Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 27 Nov 2025 16:07:49 +0000 Subject: [PATCH 8/9] Fix local variable initialization to use unmatchedTypeForBinaryOP for type errors Co-authored-by: wuzhi456 <217564920+wuzhi456@users.noreply.github.com> --- src/main/java/impl/Compiler.java | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/src/main/java/impl/Compiler.java b/src/main/java/impl/Compiler.java index 0dca168..4c43813 100644 --- a/src/main/java/impl/Compiler.java +++ b/src/main/java/impl/Compiler.java @@ -783,11 +783,29 @@ public Type visitVarDecStmt(SplcParser.VarDecStmtContext ctx) { symbolTable.addOther(varName, varType, Symbol.Kind.VARIABLE); // Visit initialization expression if present and check type compatibility + // Use assignment rules [2.2.14] with unmatchedTypeForBinaryOP for type errors if (ctx.expression() != null) { try { ExprInfo exprInfo = checkExpression(ctx.expression()); - if (!typesEqual(varType, exprInfo.type)) { - Project4SemanticError.unexpectedType(ctx.expression(), exprInfo.type).throwException(); + + // Check if lhs or rhs is array type - arrays cannot be assigned + if (varType instanceof ArrayType || exprInfo.type instanceof ArrayType) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx.expression(), ctx.ASSIGN().getSymbol(), varType, exprInfo.type).throwException(); + } + + // Check that both sides are integer or pointer types + if (!isIntegerType(varType) && !isPointerType(varType)) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx.expression(), ctx.ASSIGN().getSymbol(), varType, exprInfo.type).throwException(); + } + if (!isIntegerType(exprInfo.type) && !isPointerType(exprInfo.type)) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx.expression(), ctx.ASSIGN().getSymbol(), varType, exprInfo.type).throwException(); + } + + // Special case: allow 0 as null pointer + boolean rhsIsZero = isConstantZero(ctx.expression()); + + if (!rhsIsZero && !typesEqual(varType, exprInfo.type)) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx.expression(), ctx.ASSIGN().getSymbol(), varType, exprInfo.type).throwException(); } } catch (Project4Exception ex) { hasSemanticErrors = true; From eb97c95fcda6f0c3cb43333392f165f60d7b8555 Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 27 Nov 2025 16:45:27 +0000 Subject: [PATCH 9/9] Add type checking for global variable initialization Co-authored-by: wuzhi456 <217564920+wuzhi456@users.noreply.github.com> --- src/main/java/impl/Compiler.java | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/src/main/java/impl/Compiler.java b/src/main/java/impl/Compiler.java index 4c43813..8db5c4e 100644 --- a/src/main/java/impl/Compiler.java +++ b/src/main/java/impl/Compiler.java @@ -646,6 +646,36 @@ public Type visitGlobalDef(SplcParser.GlobalDefContext ctx) { } } + // Check initialization expression if present using assignment rules [2.2.14] + if (ctx.expression() != null) { + try { + ExprInfo exprInfo = checkExpression(ctx.expression()); + + // Check if lhs or rhs is array type - arrays cannot be assigned + if (varType instanceof ArrayType || exprInfo.type instanceof ArrayType) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx.expression(), ctx.ASSIGN().getSymbol(), varType, exprInfo.type).throwException(); + } + + // Check that both sides are integer or pointer types + if (!isIntegerType(varType) && !isPointerType(varType)) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx.expression(), ctx.ASSIGN().getSymbol(), varType, exprInfo.type).throwException(); + } + if (!isIntegerType(exprInfo.type) && !isPointerType(exprInfo.type)) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx.expression(), ctx.ASSIGN().getSymbol(), varType, exprInfo.type).throwException(); + } + + // Special case: allow 0 as null pointer + boolean rhsIsZero = isConstantZero(ctx.expression()); + + if (!rhsIsZero && !typesEqual(varType, exprInfo.type)) { + Project4SemanticError.unmatchedTypeForBinaryOP(ctx.expression(), ctx.ASSIGN().getSymbol(), varType, exprInfo.type).throwException(); + } + } catch (Project4Exception ex) { + hasSemanticErrors = true; + grader.reportSemanticError(ex); + } + } + } else if (ctx.Identifier() != null && ctx.funcArgs() != null) { // Function declaration: specifier Identifier LPAREN funcArgs RPAREN SEMI TerminalNode funcName = ctx.Identifier();