/// <summary>
/// Creates a lambda compiler that will compile into the provided Methodbuilder
/// </summary>
private LambdaCompiler(AnalyzedTree tree, LambdaExpression lambda, IMethodBuilderForLambdaCompiler method)
{
_hasClosureArgument = tree.Scopes[lambda].NeedsClosure;
Type[] paramTypes = GetParameterTypes(lambda);
if (_hasClosureArgument)
{
paramTypes = paramTypes.AddFirst(typeof(Closure));
}
method.SetReturnType(lambda.ReturnType);
method.SetParameters(paramTypes);
var paramNames = lambda.Parameters.Map(p => p.Name);
// parameters are index from 1, with closure argument we need to skip the first arg
int startIndex = _hasClosureArgument ? 2 : 1;
for (int i = 0; i < paramNames.Length; i++)
{
method.DefineParameter(i + startIndex, ParameterAttributes.None, paramNames[i]);
}
_tree = tree;
_lambda = lambda;
_typeBuilder = (TypeBuilder)method.DeclaringType;
_method = method.AsMethodBase();
_ilg = method.GetILGenerator();
// These are populated by AnalyzeTree/VariableBinder
_scope = tree.Scopes[lambda];
_boundConstants = tree.Constants[lambda];
InitializeMethod();
}
/// <summary>
/// Mutates the MethodBuilder parameter, filling in IL, parameters,
/// and return type.
///
/// (probably shouldn't be modifying parameters/return type...)
/// </summary>
internal static void Compile(LambdaExpression lambda, IMethodBuilderForLambdaCompiler method, DebugInfoGenerator debugInfoGenerator)
{
// 1. Bind lambda
AnalyzedTree tree = AnalyzeLambda(ref lambda);
tree.DebugInfoGenerator = debugInfoGenerator;
// 2. Create lambda compiler
LambdaCompiler c = new LambdaCompiler(tree, lambda, method);
// 3. Emit
c.EmitLambdaBody();
}