/// <summary>
/// Creates a lambda compiler that will compile to a dynamic method
/// </summary>
private LambdaCompiler(AnalyzedTree tree, LambdaExpression lambda)
{
var parameterTypes = GetParameterTypes(lambda).AddFirst(typeof(Closure));
var method = new DynamicMethod(lambda.Name ?? "lambda_method", lambda.ReturnType, parameterTypes, true);
_tree = tree;
_lambda = lambda;
_method = method;
// In a Win8 immersive process user code is not allowed to access non-W8P framework APIs through
// reflection or RefEmit. Framework code, however, is given an exemption.
// This is to make sure that user code cannot access non-W8P framework APIs via ExpressionTree.
// TODO: This API is not available, is there an alternative way to achieve the same.
// method.ProfileAPICheck = true;
_ilg = method.GetILGenerator();
_hasClosureArgument = true;
// These are populated by AnalyzeTree/VariableBinder
_scope = tree.Scopes[lambda];
_boundConstants = tree.Constants[lambda];
InitializeMethod();
}
/// <summary>
/// Creates a lambda compiler that will compile into the provided Methodbuilder
/// </summary>
private LambdaCompiler(AnalyzedTree tree, LambdaExpression lambda, MethodBuilder method)
{
_hasClosureArgument = tree.Scopes[lambda].NeedsClosure;
var 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
var 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;
_ilg = method.GetILGenerator();
// These are populated by AnalyzeTree/VariableBinder
_scope = tree.Scopes[lambda];
_boundConstants = tree.Constants[lambda];
InitializeMethod();
}
/// <summary>
/// Creates a lambda compiler for an inlined lambda
/// </summary>
private LambdaCompiler(LambdaCompiler parent, LambdaExpression lambda)
{
_tree = parent._tree;
_lambda = lambda;
_method = parent._method;
_ilg = parent._ilg;
_hasClosureArgument = parent._hasClosureArgument;
_typeBuilder = parent._typeBuilder;
_scope = _tree.Scopes[lambda];
_boundConstants = parent._boundConstants;
}