evaluate method

  1. @override
void evaluate(
  1. SymbolTable table
)
override

Evaluates this AST node and generates corresponding LLVM IR code.

This is the main method that each AST node must implement to:

  1. Perform semantic analysis (type checking, symbol resolution)
  2. Generate LLVM IR instructions for the node's operation
  3. Return the result value (if this is an expression)

Parameters:

  • table: The current symbol table for variable and function lookups

Returns: The result of evaluating this node (type depends on node type)

Throws:

  • Exception for semantic errors (undefined variables, type mismatches, etc.)
  • Various specific exceptions for different error conditions

Note: The base implementation throws "Not implemented" - concrete subclasses must override this method with their specific evaluation logic.

Implementation

@override
void evaluate(SymbolTable table) {
  var conditionResult = condition.evaluate(table);
  //cant be array
  //has to be int
  if (conditionResult.type is! PrimitiveType ||
      conditionResult.type.primitiveType != PrimitiveTypes.int) {
    throw Exception("Condition must be int");
  }

  Node.addIrLine(
      "%conditionCast.$id = icmp ne i64 ${conditionResult.regName}, 0");
  Node.addIrLine(
      "br i1 %conditionCast.$id, label %then.$id, label %else.$id");
  Node.addIrlLabel("then.$id");
  thenBlock.evaluate(table);
  final elseNode = elseBlock;
  Node.addIrLine("br label %end.$id");
  Node.endIrLabel();
  Node.addIrlLabel("else.$id");
  if (elseNode != null) {
    elseNode.evaluate(table);
  }

  Node.addIrLine("br label %end.$id");
  Node.endIrLabel();
  Node.addIrLine("end.$id:");
}