protected override ErlangValue EvaluateLocal(ErlangProcess process, string functionName, ErlangValue[] parameters)
{
var function = GetFunction(functionName, parameters.Length);
if (function == null)
{
return(new ErlangError("no matching function found"));
}
if (!function.IsPublic)
{
return(new ErlangError("no matching function found"));
}
var overload = function.GetFunctionOverload(process, parameters);
if (overload != null)
{
return(overload.Evaluate(process));
}
else
{
return(new ErlangError("no matching function found"));
}
}
public override ErlangValue Evaluate(ErlangProcess process)
{
ErlangValue result = null;
bool evaluated = false;
var parameters = Parameters.Select(p => p.Evaluate(process)).ToArray();
if (Module == null)
{
var module = GetModule();
if (module != null)
{
// try to execute from the current module
if (module.FunctionExistsInternal(Function, parameters.Length))
{
result = module.EvaluateInternal(process, Function, parameters);
evaluated = true;
}
}
}
if (!evaluated)
{
// couldn't execute from this module, kick it back to the ErlangProcess to find the function
result = process.Evaluate(Module, Function, parameters);
}
return(result);
}
public override ErlangValue Evaluate(ErlangProcess process)
{
var value = Expression.Evaluate(process);
if (value.Kind == ErlangValueKind.Error)
{
return(value);
}
foreach (var branch in Branches)
{
process.CallStack.CurrentFrame.IncreaseScopeLevel();
if (ErlangBinder.TryBindParameter(branch.Pattern, value, process.CallStack.CurrentFrame))
{
if (branch.Guard == null || ErlangAtom.IsTrue(branch.Guard.Evaluate(process)))
{
var result = branch.Evaluate(process);
process.CallStack.CurrentFrame.DecreaseScopeLevel();
return(result);
}
}
process.CallStack.CurrentFrame.DecreaseScopeLevel();
}
return(new ErlangError("bad match on case"));
}
public override ErlangValue Evaluate(ErlangProcess process)
{
var result = Expression.Evaluate(process);
if (result.Kind == ErlangValueKind.Error)
{
return(result);
}
switch (Operator)
{
case ErlangOperatorKind.Plus:
return(ErlangValue.Multiply(result, ErlangNumber.One));
case ErlangOperatorKind.Minus:
return(ErlangValue.Multiply(result, ErlangNumber.NegativeOne));
case ErlangOperatorKind.Not:
return(ErlangValue.Not(result));
case ErlangOperatorKind.BNot:
if (result.Kind == ErlangValueKind.Number)
{
return(ErlangNumber.BNot((ErlangNumber)result));
}
else
{
return(new ErlangError("not integral"));
}
default:
return(new ErlangError(string.Format("Invalid unary operator: {0}", Operator)));
}
}
public ErlangValue Evaluate(ErlangProcess process, string functionName, ErlangValue[] parameters)
{
ErlangValue error = null;
if (functionName == "module_info")
{
if (parameters.Length == 0)
{
return(ModuleInfo);
}
else if (parameters.Length == 1)
{
if (parameters[0].Kind == ErlangValueKind.Atom)
{
var text = ((ErlangAtom)parameters[0]).Name;
if (text == "functions")
{
return(AllFunctions);
}
else
{
// find matching tuple
var list = ModuleInfo;
while (list != null && list.Value != null)
{
Debug.Assert(list.Value is ErlangTuple);
var tuple = (ErlangTuple)list.Value;
Debug.Assert(tuple.Airity == 2);
Debug.Assert(tuple.Values[0].Kind == ErlangValueKind.Atom);
if (((ErlangAtom)tuple.Values[0]).Name == text)
{
Debug.Assert(tuple.Values[1].Kind == ErlangValueKind.List);
return(tuple.Values[1]);
}
list = list.Tail as ErlangList;
}
return(new ErlangError("no matching tuple item"));
}
}
else
{
error = new ErlangError("no matching function");
}
}
else
{
error = new ErlangError("no matching function");
}
}
error = error ?? parameters.FirstOrDefault(p => p.Kind == ErlangValueKind.Error);
return(error ?? EvaluateLocal(process, functionName, parameters));
}
protected override ErlangValue EvaluateLocal(ErlangProcess process, string function, ErlangValue[] parameters)
{
MethodInfo methodInfo;
if (functionMap.TryGetValue(Tuple.Create(function, parameters.Length), out methodInfo))
{
return((ErlangValue)methodInfo.Invoke(Target, parameters));
}
return(new ErlangError("no matching function found"));
}
public ErlangReplFunctions(ErlangProcess process)
{
this.process = process;
foreach (var methodInfo in GetType().GetTypeInfo().DeclaredMethods)
{
var parameters = methodInfo.GetParameters();
var methodAttrs = methodInfo.GetCustomAttributes(typeof(ErlangFunctionAttribute), false).OfType <ErlangFunctionAttribute>().ToArray();
if (parameters.All(p => p.ParameterType == typeof(ErlangExpression)) &&
methodInfo.ReturnType == typeof(ErlangValue) &&
methodAttrs.Length == 1)
{
functionMap.Add(Tuple.Create(methodAttrs[0].Name, parameters.Length), methodInfo);
}
}
}
public override ErlangValue Evaluate(ErlangProcess process)
{
var values = new ErlangValue[Elements.Length];
for (int i = 0; i < Elements.Length; i++)
{
var value = Elements[i].Evaluate(process);
if (value.Kind == ErlangValueKind.Error)
{
return(value);
}
values[i] = value;
}
return(new ErlangTuple(values));
}
public ErlangFunctionOverloadExpression GetFunctionOverload(ErlangProcess process, ErlangValue[] parameters)
{
Debug.Assert(parameters.Length == Airity);
for (int i = 0; i < Overloads.Length; i++)
{
if (Overloads[i].TryBindParameters(process, parameters))
{
var guard = Overloads[i].Guard;
if (guard == null || ErlangAtom.IsTrue(guard.Evaluate(process)))
{
return(Overloads[i]);
}
}
}
return(null);
}
public override ErlangValue Evaluate(ErlangProcess process)
{
var values = new ErlangValue[Elements.Length];
for (int i = 0; i < Elements.Length; i++)
{
var value = Elements[i].Evaluate(process);
if (value.Kind == ErlangValueKind.Error)
{
return(value);
}
values[i] = value;
}
var list = new ErlangList(values, Tail == null ? null : Tail.Evaluate(process));
return(list);
}
public static bool TryBindParameters(ErlangProcess process, ErlangExpression[] parameters, ErlangValue[] values)
{
if (parameters.Length != values.Length)
{
return(false);
}
var frame = process.CallStack.CurrentFrame;
for (int i = 0; i < values.Length; i++)
{
if (!ErlangBinder.TryBindParameter(parameters[i], values[i], frame, true))
{
return(false);
}
}
return(true);
}
internal ErlangValue EvaluateInternal(ErlangProcess process, string functionName, ErlangValue[] parameters)
{
ErlangValue result;
var function = GetFunction(functionName, parameters.Length);
process.CallStack.Push(new ErlangStackFrame(Name, functionName, parameters.Length));
var overload = function.GetFunctionOverload(process, parameters);
if (overload != null)
{
result = overload.Evaluate(process);
}
else
{
result = new ErlangError("no matching function found");
}
process.CallStack.Pop();
return(result);
}
public override ErlangValue Evaluate(ErlangProcess process)
{
Debug.Assert(Clauses.Length > 0);
var isAnd = Clauses[0].IsAnd;
var result = ErlangAtom.IsTrue(Clauses[0].Evaluate(process));
for (int i = 1; i < Clauses.Length; i++)
{
var next = Clauses[i].Evaluate(process);
if (isAnd)
{
result = result && ErlangAtom.IsTrue(Clauses[i].Evaluate(process));
}
else
{
result = result || ErlangAtom.IsTrue(Clauses[i].Evaluate(process));
}
isAnd = Clauses[i].IsAnd;
}
return(result ? ErlangAtom.True : ErlangAtom.False);
}
public bool TryBindParameters(ErlangProcess process, ErlangValue[] values)
{
return(TryBindParameters(process, Parameters, values));
}
protected abstract ErlangValue EvaluateLocal(ErlangProcess process, string functionName, ErlangValue[] parameters);
public ErlangBifs(ErlangProcess process)
{
Process = process;
}
public override ErlangValue Evaluate(ErlangProcess process)
{
// variable assignment or pattern match
if (Operator == ErlangOperatorKind.Equals)
{
// first evaluate the right side
var right = Right.Evaluate(process);
if (right.Kind == ErlangValueKind.Error)
{
return(right);
}
// now match to the left
if (ErlangBinder.TryBindParameter(Left, right, process.CallStack.CurrentFrame))
{
return(right);
}
else
{
return(new ErlangError("bad match"));
}
}
var left = Left.Evaluate(process);
if (left.Kind == ErlangValueKind.Error)
{
return(left);
}
if (IsShortCircuitOperator(Operator))
{
switch (Operator)
{
case ErlangOperatorKind.AndAlso:
if (ErlangAtom.IsTrue(left))
{
return(Right.Evaluate(process));
}
else
{
return(ErlangAtom.False);
}
case ErlangOperatorKind.OrElse:
if (ErlangAtom.IsTrue(left))
{
return(left);
}
else
{
return(Right.Evaluate(process));
}
default:
throw new ArgumentException("invalid operator");
}
}
else
{
var right = Right.Evaluate(process);
if (right.Kind == ErlangValueKind.Error)
{
return(right);
}
switch (Operator)
{
case ErlangOperatorKind.Plus:
return(ErlangValue.Add(left, right));
case ErlangOperatorKind.Minus:
return(ErlangValue.Subtract(left, right));
case ErlangOperatorKind.Asterisk:
return(ErlangValue.Multiply(left, right));
case ErlangOperatorKind.Slash:
return(ErlangValue.Divide(left, right));
case ErlangOperatorKind.And:
return(ErlangValue.And(left, right));
case ErlangOperatorKind.Or:
return(ErlangValue.Or(left, right));
case ErlangOperatorKind.Less:
return(ErlangValue.Less(left, right));
case ErlangOperatorKind.EqualsLess:
return(ErlangValue.LessEquals(left, right));
case ErlangOperatorKind.Greater:
return(ErlangValue.Greater(left, right));
case ErlangOperatorKind.GreaterEquals:
return(ErlangValue.GreaterEquals(left, right));
case ErlangOperatorKind.EqualsEquals:
return(ErlangValue.EqualsEquals(left, right));
case ErlangOperatorKind.SlashEquals:
return(ErlangValue.SlashEquals(left, right));
case ErlangOperatorKind.EqualsColonEquals:
return(ErlangValue.EqualsColonEquals(left, right));
case ErlangOperatorKind.EqualsSlashEquals:
return(ErlangValue.EqualsSlashEquals(left, right));
case ErlangOperatorKind.PlusPlus:
return(ErlangValue.PlusPlus(left, right));
default:
throw new ArgumentException("invalid operator");
}
}
}
public override ErlangValue Evaluate(ErlangProcess process)
{
var value = process.CallStack.CurrentFrame.GetVariable(Variable);
return(value ?? new ErlangError(string.Format("No such variable {0}", Variable)));
}
public override ErlangValue Evaluate(ErlangProcess process)
{
return(Evaluate());
}
public override ErlangValue Evaluate(ErlangProcess process)
{
return(Expression.Evaluate(process));
}
public ErlangExpressionEvaluator()
{
Process = new ErlangProcess();
}
public virtual ErlangValue Evaluate(ErlangProcess process)
{
throw new NotSupportedException();
}
public override ErlangValue Evaluate(ErlangProcess process)
{
ErlangValue last = null;
ErlangExpressionBlockExpression def = this;
ErlangCompiledModule module = GetModule();
var children = def.GetChildren();
bool doTailCall = false;
do
{
doTailCall = false; // ensure we're reset from the last loop
// evaluate each expression
Debug.Assert(children.Length > 0);
for (int i = 0; !doTailCall && i < children.Length; i++)
{
var expression = children[i];
string moduleName = null;
ErlangFunctionInvocationExpression function = null;
ErlangStackFrame tailCallCandidate = null;
if (UseTailCalls && i == children.Length - 1 && expression is ErlangFunctionInvocationExpression && expression.IsLastChild)
{
// if last expression and it's a function invocation
function = (ErlangFunctionInvocationExpression)expression;
moduleName = function.Module ?? module.Name;
tailCallCandidate = process.CallStack.GetTailCallCandidate(
moduleName,
function.Function,
function.Parameters.Length);
doTailCall = tailCallCandidate != null;
}
if (doTailCall)
{
// evaluate parameters
var evaledParams = new ErlangValue[function.Parameters.Length];
for (int j = 0; j < function.Parameters.Length; j++)
{
var value = function.Parameters[j].Evaluate(process);
if (value.Kind == ErlangValueKind.Error)
{
return(value);
}
evaledParams[j] = value;
}
// prepare new frame
var newFrame = new ErlangStackFrame(tailCallCandidate.Module,
tailCallCandidate.Function,
tailCallCandidate.Airity);
process.CallStack.RewindForTailCall(newFrame);
// find the new definition
var group = module.GetFunction(function.Function, evaledParams.Length);
def = group.GetFunctionOverload(process, evaledParams);
if (def == null)
{
return(new ErlangAtom("no_such_tailcall_function"));
}
children = def.GetChildren();
}
else
{
// not a tailcall, just invoke normally
last = children[i].Evaluate(process);
if (last.Kind == ErlangValueKind.Error)
{
return(last); // decrease scope?
}
}
}
} while (doTailCall);
return(last);
}
