// An ObjExp is just a temporary node. But that's the best a Context-Free parse can
// do. So now that we're building a symbol table, we can do a Context-Sensitive resolution
// and figure out what type of node this really is.
public Exp GetResolvedNode(ISemanticResolver s, bool fRight)
{
Exp eResolved = null;
// Lookup the symbol and determine what we are
//SymEntry sym = s.LookupSymbol(this.m_strId, true);
string stName = this.m_strId.Text;
SymEntry sym = s.LookupSymbolWithContext(this.m_strId, false); // allow methods
// Namespace
if (sym is NamespaceEntry)
{
eResolved = new NamespaceExp(sym as NamespaceEntry);
}
// Local Variable
else if (sym is LocalVarExpEntry)
{
eResolved = new LocalExp(sym as LocalVarExpEntry);
}
// Parameter
else if (sym is ParamVarExpEntry)
{
eResolved = new ParamExp(sym as ParamVarExpEntry);
}
// A type name
else if (sym is TypeEntry)
{
eResolved = new TypeExp(sym as TypeEntry);
}
// A field (w/ an implied 'this' pointer)
else if (sym is FieldExpEntry)
{
// When a single identifier resolves to a field, it can be either
// an instance field with an implied 'this' ref, or a static field of this class.
FieldExpEntry f = sym as FieldExpEntry;
Exp expInstance = null;
if (!f.IsStatic)
{
expInstance = new SimpleObjExp("this");
Exp.ResolveExpAsRight(ref expInstance, s);
}
eResolved = new FieldExp(f, expInstance);
}
// An event (w/ an implied 'this' ptr)
else if (sym is EventExpEntry)
{
EventExpEntry e = (EventExpEntry) sym;
Exp expInstance = null;
if (!e.Mods.IsStatic)
{
expInstance = new SimpleObjExp("this");
Exp.ResolveExpAsRight(ref expInstance, s);
}
eResolved = new EventExp(e, expInstance);
}
// A property (w/ an implied 'this' ptr).
// Properties will eventually be converted into method calls.
else if (sym is PropertyExpEntry)
{
PropertyExpEntry p = (PropertyExpEntry) sym;
Exp expInstance = null;
if (!p.IsStatic)
{
expInstance = new SimpleObjExp("this");
Exp.ResolveExpAsRight(ref expInstance, s);
}
eResolved = new PropertyExp(p, expInstance);
}
// Not recognized.
else {
if (stName == "this") // check a common error case...
Debug.Assert(false, "Can't access 'this'. Are we in a static?");
if (sym == null)
{
MethodHeaderEntry h = s.GetCurrentClass().LookupMethodHeader(this.m_strId.Text);
if (h != null)
{
return this;
}
ThrowError(SymbolError.UndefinedSymbol(m_strId));
//Debug.Assert(false, "Unknown name in SimpleObjExp:" + stName);
}
Debug.Assert(false, "Unknown symbol type:" + ((sym == null) ? "null" : sym.ToString()));
}
Debug.Assert(eResolved != null);
return eResolved;
}
// Semantic resolution
protected override Exp ResolveExpAsRight(ISemanticResolver s)
{
// Only resolve once.
if (m_symbol != null)
return this;
// First, resolve our parameters (because of overloading)
// We need to know the URT types for our parameters
// in order to resolve between overloaded operators
Type [] alParamTypes = new Type[m_arParams.Length];
for(int i = 0; i < m_arParams.Length; i++)
{
Exp e = m_arParams[i];
ResolveExpAsRight(ref e, s);
Debug.Assert(e == m_arParams[i]);
Type tParam = e.CLRType;
//if ((tParam !=null) && tParam.IsByRef)
// tParam = tParam.GetElementType();
alParamTypes[i] = tParam;
//Debug.Assert(alParamTypes[i] != null);
}
TypeEntry tCur = s.GetCurrentClass();
TypeEntry tLeft = null; // Type to lookup in
// Is this a 'base' access?
// Convert to the real type and set a non-virtual flag
if (m_objExp is SimpleObjExp)
{
SimpleObjExp e = m_objExp as SimpleObjExp;
if (e.Name.Text == "base")
{
// Set the scope that we lookup in.
tLeft = tCur.Super;
// Still need to resolve the expression.
m_objExp = new SimpleObjExp("this");
m_fIsNotPolymorphic = true;
}
}
#if true
// See if we have a delegate here
Exp eDelegate = null;
if (m_objExp == null)
{
Exp e = new SimpleObjExp(m_idName);
Exp.ResolveExpAsRight(ref e, s);
if (!(e is SimpleObjExp))
eDelegate = e;
} else {
// If it's an interface, then we know we can't have a delegate field on it,
// so short-circuit now.
Exp.ResolveExpAsRight(ref m_objExp, s);
if (!m_objExp.CLRType.IsInterface)
{
Exp e = new DotObjExp(m_objExp, m_idName);
Exp.ResolveExpAsRight(ref e, s);
if (!(e is DotObjExp))
eDelegate = e;
}
}
if (eDelegate != null)
{
if (!DelegateDecl.IsDelegate(eDelegate.CLRType))
{
//Debug.Assert(false, "@todo - " + m_strName + " is not a delegate or function"); // @todo - legit
// Just fall through for now, method resolution will decide if this is a valid function
} else
{
Exp e = new MethodCallExp(
eDelegate,
new Identifier("Invoke"),
this.m_arParams
);
Exp.ResolveExpAsRight(ref e, s);
return e;
}
}
#endif
// No delegate, carry on with a normal function call
// If there's no objexp, then the function is a method
// of the current class.
// make it either a 'this' or a static call
if (m_objExp == null)
{
// Lookup
bool fIsVarArgDummy;
MethodExpEntry sym = tCur.LookupMethod(s, m_idName, alParamTypes, out fIsVarArgDummy);
if (sym.IsStatic)
{
m_objExp = new TypeExp(tCur);
} else {
m_objExp = new SimpleObjExp("this");
}
}
// Need to Lookup m_strName in m_objExp's scope (inherited scope)
Exp.ResolveExpAsRight(ref m_objExp, s);
// Get type of of left side object
// This call can either be a field on a variable
// or a static method on a class
bool fIsStaticMember = false;
// If we don't yet know what TypeEntry this methodcall is on, then figure
// it out based off the expression
if (tLeft == null)
{
if (m_objExp is TypeExp)
{
fIsStaticMember = true;
tLeft = ((TypeExp) m_objExp).Symbol;
} else {
fIsStaticMember = false;
tLeft = s.ResolveCLRTypeToBlueType(m_objExp.CLRType);
}
}
// Here's the big lookup. This will jump through all sorts of hoops to match
// parameters, search base classes, do implied conversions, varargs,
// deal with abstract, etc.
bool fIsVarArg;
m_symbol = tLeft.LookupMethod(s, m_idName, alParamTypes, out fIsVarArg);
Debug.Assert(m_symbol != null);
if (m_fIsNotPolymorphic)
{
// of the form 'base.X(....)'
if (m_symbol.IsStatic)
ThrowError(SymbolError.BaseAccessCantBeStatic(this.Location, m_symbol)); // @todo - PrintError?
} else {
// normal method call
/*
if (fIsStaticMember && !m_symbol.IsStatic)
ThrowError(SymbolError.ExpectInstanceMember(this.Location)); // @todo - PrintError?
else if (!fIsStaticMember && m_symbol.IsStatic)
ThrowError(SymbolError.ExpectStaticMember(this.Location)); // @todo - PrintError?
*/
Debug.Assert(fIsStaticMember == m_symbol.IsStatic, "@todo - user error. Mismatch between static & instance members on line.");
}
// If we have a vararg, then transform it
if (fIsVarArg)
{
// Create the array
int cDecl = m_symbol.ParamCount;
int cCall = this.ParamExps.Length;
ArrayTypeSig tSig = new ArrayTypeSig(m_symbol.ParamCLRType(cDecl - 1), s);
Node [] list = new Node[cCall - cDecl + 1];
for(int i = 0; i < list.Length; i++)
{
list[i] = this.ParamExps[i + cDecl - 1];
}
Exp eArray = new NewArrayObjExp(
tSig,
new ArrayInitializer(
list
)
);
Exp.ResolveExpAsRight(ref eArray, s);
// Change the parameters to use the array
ArgExp [] arParams = new ArgExp[cDecl];
for(int i = 0; i < cDecl - 1; i++)
arParams[i] = m_arParams[i];
arParams[cDecl - 1] = new ArgExp(EArgFlow.cIn, eArray);
m_arParams = arParams;
} // end vararg transformation
this.CalcCLRType(s);
return this;
}