private static LoweredFunction LowerFunction(BoundFunctionDeclaration declaration)
{
var loweredBody = Lowerer.Lower(declaration.Body);
return(new LoweredFunction(
declaration: declaration,
name: declaration.Name,
inputDescription: declaration.InputDescription,
outputDescription: declaration.OutputDescription,
body: loweredBody));
}
public LoweredFunction(
BoundFunctionDeclaration declaration,
string name,
ImmutableArray <ParameterSymbol> inputDescription,
ImmutableArray <ParameterSymbol> outputDescription,
BoundBlockStatement body)
{
Declaration = declaration;
Name = name;
InputDescription = inputDescription;
OutputDescription = outputDescription;
Body = body;
}
public static BoundProgram BindProgram(SyntaxTree syntaxTree)
{
var binder = new Binder();
var boundRoot = binder.BindRoot(syntaxTree.NullRoot);
var statements = ((BoundBlockStatement)boundRoot.File.Body).Statements;
var functionsBuilder = ImmutableDictionary.CreateBuilder <FunctionSymbol, LoweredFunction>();
var globalStatements = statements.Where(s => s.Kind != BoundNodeKind.FunctionDeclaration).ToArray();
var mainFunction = (FunctionSymbol?)null;
var scriptFunction = (FunctionSymbol?)null;
if (globalStatements.Length > 0)
{
// we have to gather all bound expression statements into a "script" function.
scriptFunction = new FunctionSymbol("%script");
var body = Block(globalStatements[0].Syntax, globalStatements);
var loweredBody = Lowerer.Lower(body);
var declaration = new BoundFunctionDeclaration(
syntax: globalStatements[0].Syntax,
name: "%script",
inputDescription: ImmutableArray <ParameterSymbol> .Empty,
outputDescription: ImmutableArray <ParameterSymbol> .Empty,
body: body);
var loweredFunction = LowerFunction(declaration);
functionsBuilder.Add(scriptFunction, loweredFunction);
}
var functions = statements.OfType <BoundFunctionDeclaration>().ToArray();
var first = true;
foreach (var function in functions)
{
var functionSymbol = new FunctionSymbol(
name: function.Name);
var loweredFunction = LowerFunction(function);
functionsBuilder.Add(functionSymbol, loweredFunction);
if (first && globalStatements.Length == 0)
{
// the first function in a file will become "main".
first = false;
mainFunction = functionSymbol;
}
}
return(new BoundProgram(
binder._diagnostics.ToImmutableArray(),
mainFunction,
scriptFunction,
functionsBuilder.ToImmutable()));
}
