private void emitStatement(Node stmt, bool is_last = false)
{
if (stmt is DeclareVar decl)
{
localSymbols[decl.var.lexeme] = il.DeclareLocal(ToType(decl.type));
if (!(decl.expr is null))
{
AssignVar assign = new AssignVar(decl.var, decl.expr);
emitExpr(assign);
}
}
else if (stmt is ReturnValue ret)
{
emitExpr(ret.value);
if (!is_last)
{
il.Emit(OpCodes.Ret);
}
}
else
{
emitExpr(stmt);
}
}
private Node parseAssign()
{
Node left = parseTerm();
while (match(TType.EQUALS))
{
if (left is Variable var)
{
left = new AssignVar(var.Name, parseTerm());
}
else if (left is IndexArray idxarr)
{
left = new SetInArray(idxarr.value, idxarr.idx, parseTerm());
}
else
{
throw new Exception("Invalid assignment target (Expected variable or array index)");
}
}
return(left);
}
private void emitDecl(CodeBlock decls)
{
foreach (Node statement in decls.statements)
{
if (statement is FuncDef fdef)
{
Type[] argTypes = Type.EmptyTypes;
if (fdef.param.Length != 0)
{
current_method_args = new string[fdef.param.Length];
argTypes = new Type[fdef.param.Length];
for (int i = 0; i < argTypes.Length; ++i)
{
argTypes[i] = ToType((TypeNode)fdef.param[i][1]);
current_method_args[i] = ((Token)fdef.param[i][0]).lexeme;
}
}
else
{
current_method_args = new string[] { }
};
current_method_types = argTypes;
cMethod = cTypeBuilder.DefineMethod(fdef.funcName.lexeme, MethodAttributes.Public | MethodAttributes.Static, ToType(fdef.funcReturnType), argTypes);
if (fdef.funcName.lexeme == "main")
{
mainMethod = cMethod;
}
il = cMethod.GetILGenerator();
if (il is null)
{
throw new Exception("IL is null");
}
localSymbols = new Dictionary <string, LocalBuilder>();
Node[] stmts = ((CodeBlock)fdef.body).statements;
for (int i = 0; i < stmts.Length; ++i)
{
emitStatement(stmts[i], is_last: i == stmts.Length - 1);
}
il.Emit(OpCodes.Ret);
externMethods[fdef.funcName.lexeme] = cMethod;
}
else if (statement is DeclareVar decl)
{
globalSymbols[decl.var.lexeme] = cTypeBuilder.DefineField(decl.var.lexeme, ToType(decl.type), FieldAttributes.Private | FieldAttributes.Static);
il = mainInitializer.GetILGenerator();
if (!(decl.expr is null))
{
AssignVar assign = new AssignVar(decl.var, decl.expr);
emitExpr(assign);
}
}
else if (statement is ExternMethod extMethod)
{
Type type = Type.GetType(extMethod.typeName);
if (type is null)
{
throw new Exception($"Failed to load external type {type.Name}");
}
Type[] argTypes = Type.EmptyTypes;
if (extMethod.argTypes.Length != 0)
{
argTypes = new Type[extMethod.argTypes.Length];
for (int i = 0; i < extMethod.argTypes.Length; ++i)
{
argTypes[i] = ToType(extMethod.argTypes[i]);
}
}
MethodInfo method = type.GetMethod(extMethod.methodName, argTypes);
if (method is null)
{
throw new Exception($"Failed to load method {extMethod.methodName} from type {extMethod.typeName}");
}
externMethods[extMethod.varName] = method;
}
}
}