/// <summary>
/// Prepare() is called once before the first execution of function.
/// </summary>
void Prepare()
{
if (CurrentStatus < Status.Preparing)
{
Analyze();
var configuration = JSRuntime.Instance.Configuration;
CurrentStatus = Status.Preparing;
ParametersMask.Value = mdr.DFunctionSignature.GetMask(ParametersCount);
//TODO: heuristic to disable TypeInference, we can also see if the func does not have any argument AND the "arguments" variable is not referenced in the functiob body
EnableTypeInference =
configuration.EnableTypeInference &&
configuration.EnableJIT &&
(ParametersCount <= mdr.DFunctionSignature.TypesPerElement) &&
(Scope.HasLoop || Scope.Symbols.Count > 0)
;
//if (ParametersCount <= mdr.DFunctionSignature.TypesPerElement)
if (EnableTypeInference)
{
SignatureMask.Value = ParametersMask.Value;
}
else
{
SignatureMask.Value = mdr.DFunctionSignature.EmptySignature.Value;
}
//TODO: make this a configuration parameter.
EnableProfiling = configuration.EnableProfiling && !IsBlackListed;
FunctionDeclarationHoister.Execute(this);
if (configuration.EnableMethodCallResolution)
{
MethodResolver.Execute(this);
}
EnableInlineCache = configuration.EnableInlineCache;
var timer =
configuration.ProfileFunctionTime
? JSRuntime.StartTimer(configuration.ProfileJitTime, "JS/SymInit/" + Declaration)
: JSRuntime.StartTimer(configuration.ProfileJitTime, "JS/SymInit");
try
{
var symbols = Scope.Symbols;
for (var i = symbols.Count - 1; i >= 0; --i)
{
var symbol = symbols[i];
if (symbol.SymbolType == JSSymbol.SymbolTypes.ClosedOnLocal ||
symbol.SymbolType == JSSymbol.SymbolTypes.ParentLocal ||
symbol.SymbolType == JSSymbol.SymbolTypes.Global ||
symbol.SymbolType == JSSymbol.SymbolTypes.Unknown
)
{
symbol.AssignFieldId();
}
Debug.Assert(
!symbol.IsParameter
||
(symbol.Index == i &&
(
(symbol.ParameterIndex == i && (Scope.IsFunctionDeclaration || FunctionIR.Name == null)) ||
(symbol.ParameterIndex == (i - 1) && !Scope.IsFunctionDeclaration && FunctionIR.Name != null)
)
)
, "Invalid situation!, symbol {0} should be paramter with parameter index {1} instead of {2}", symbol.Name, i, symbol.ParameterIndex);
}
}
finally
{
JSRuntime.StopTimer(timer);
}
CurrentStatus = Status.Prepared;
}
}