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package ast.nodes;
import ast.types.*;
import java.util.ArrayList;
import semanticanalysis.SemanticError;
import semanticanalysis.SymbolTable;
import codegen.Label;
/**
* Node for the `while_stmt` statement of the grammar.
*/
public class WhileStmtNode implements Node {
private final Node expr;
private final Node block;
public WhileStmtNode(Node expr, Node block) {
this.expr = expr;
this.block = block;
}
@Override
public ArrayList<SemanticError> checkSemantics(SymbolTable ST, int _nesting, FunctionType ft) {
ArrayList<SemanticError> errors = new ArrayList<>();
errors.addAll(expr.checkSemantics(ST, _nesting, ft));
errors.addAll(block.checkSemantics(ST, _nesting, ft));
return errors;
}
@Override
public Type typeCheck() {
return new VoidType();
}
@Override
public String codeGeneration() {
String startLabel = Label.newBasic("start");
String endLabel = Label.newBasic("end");
String exprS = expr.codeGeneration();
String blockS = block.codeGeneration();
return startLabel + ":\n" +
exprS +
"storei T1 0\n" +
"beq A0 T1 " + endLabel + "\n" +
blockS +
"b " + startLabel + "\n" +
endLabel + ":\n";
}
@Override
public String printAST(String prefix) {
return prefix + "While\n" + expr.printAST(prefix + " ") + block.printAST(prefix + " ");
}
@Override
public String toPrint(String prefix) {
String str = prefix + "while ";
str += expr.toPrint("") + ":\n";
str += block.toPrint(prefix + "\t") + "\n";
return str;
}
public Node getBlock() {
return block;
}
public Node getExpr() {
return expr;
}
}
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