// Resolve expression as a RHS value. The exp node can totally change on us
// (operator overloading, constant folding, etc), so we must pass as a ref
public static void ResolveExpAsRight(ref Exp e, ISemanticResolver s)
{
// Debugging helper. Useful when we want to break when resolving
// a particular symbol.
#if false
// Set lTarget to a symbol that we want to see resolved.
FileRange lTarget = new FileRange("SemanticChecker.cs", 143, 39, 143, 43);
if (lTarget.Equals(e.Location))
{
System.Diagnostics.Debugger.Break();
}
#endif
e = e.ResolveExpAsRight(s);
Debug.Assert(e != null);
}
// Use this when we already have a static method to call
// and we already have the symbols
public MethodCallExp(
Exp eInstance, // null if static
MethodExpEntry symMethod,
ArgExp [] arParams,
ISemanticResolver s
)
{
this.m_idName = new Identifier(symMethod.Name);
m_arParams = arParams;
m_symbol = symMethod;
// Spoof Left
if (eInstance == null)
{
//m_objExp = new SimpleObjExp(symMethod.SymbolClass.Name);
m_objExp = new TypeExp(symMethod.SymbolClass);
}
else
m_objExp = eInstance;
Exp.ResolveExpAsRight(ref m_objExp, s);
// Resolve args, just in case
foreach(ArgExp eArg in arParams)
{
Exp e = eArg;
Exp.ResolveExpAsRight(ref e, s);
Debug.Assert(e == eArg);
}
//ResolveAsExpEntry(m_symbol, s);
CalcCLRType(s);
}
public AssignStmtExp(Exp expLeft, Exp expRight)
{
Debug.Assert(expLeft != null);
Debug.Assert(expRight != null);
m_oeLeft = expLeft;
m_expRight = expRight;
//m_filerange = FileRange.Merge(expLeft.Location, expRight.Location);
}
//.........................................................................
// Semantic resolution. Resolve the exp as either a LHS or RHS value.
//.........................................................................
// Resolve the expression as a LHS value
public static void ResolveExpAsLeft(ref Exp e, ISemanticResolver s)
{
e = e.ResolveExpAsLeft(s);
Debug.Assert(e != null);
}
public BinaryExp(Exp left, Exp right, BinaryOp op)
{
Debug.Assert(left != null);
Debug.Assert(right != null);
//m_filerange = FileRange.Merge(left.Location, right.Location);
m_left = left;
m_right = right;
m_op = op;
}
public UnaryExp(Exp left, UnaryOp op)
{
Debug.Assert(left != null);
m_filerange = left.Location;
m_left = left;
m_op = op;
}
public NewArrayObjExp(
ArrayTypeSig tArrayType, // full array type (includes rank)
Exp [] arExpSize, // rank to allocate, eval at runtime
ArrayInitializer aInit // optional initilizer list
)
{
Debug.Assert(tArrayType != null);
Debug.Assert(arExpSize != null);
m_tFullType = tArrayType;
this.m_arExpList = arExpSize;
this.m_ArrayInit = aInit;
// @todo - this is wrong
m_filerange = tArrayType.Location;
}
public IsExp(
Exp expTest,
TypeSig tTarget
)
{
Debug.Assert(expTest != null);
Debug.Assert(tTarget != null);
m_expTest = expTest;
m_tTarget = tTarget;
//m_filerange = FileRange.Merge(expTest.Location, tTarget.Location);
}
public BaseCastObjExp(
TypeSig tTargetType,
Exp expSource
)
{
m_tTargetType = tTargetType;
m_expSource = expSource;
Debug.Assert(m_tTargetType != null);
Debug.Assert(m_expSource != null);
// @todo - have parser resolve this
//m_filerange = FileRange.Merge(expSource.Location, m_tTargetType.Location);
}
public NewObjExp(
TypeSig tType,
Exp [] arParams
)
{
Debug.Assert(tType != null);
Debug.Assert(arParams != null);
m_tType = tType;
m_arParams = arParams;
// @todo- this is wrong
m_filerange = tType.Location;
}
public CastObjExp(
TypeSig tTargetType,
Exp expSource
)
: base(tTargetType, expSource)
{
}
public AsExp(
TypeSig tTargetType,
Exp expSource
)
: base(tTargetType, expSource)
{
}
// 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;
}
// For search path
public UsingDirective(Exp eNamespace)
{
Debug.Assert(eNamespace != null);
m_stAlias = null;
m_eNamespace = eNamespace;
}
public ArrayAccessExp(
Exp expLeft,
Exp expIndex
)
{
Debug.Assert(expLeft != null);
Debug.Assert(expIndex != null);
m_oeLeft = expLeft;
m_expIndex = expIndex;
// @todo- this is wrong
m_filerange = m_oeLeft.Location;
}
public IfExp(
Exp expTest,
Exp expTrue,
Exp expFalse
)
{
Debug.Assert(expTest != null);
Debug.Assert(expTrue != null);
Debug.Assert(expFalse != null);
m_expTest = expTest;
m_expTrue = expTrue;
m_expFalse = expFalse;
}
public FieldExp(
FieldExpEntry symbol,
Exp expInstance // null for statics
)
{
Debug.Assert(symbol != null);
m_symbol = symbol;
m_expInstance = expInstance;
}
// @todo - not really working yet. We don't do constant folding.
//.........................................................................
// Simplifying an expression that we pass in. Pass out the simplified
// expression (or the same thing we passed in if we can't simplify)
//.........................................................................
public static void TrySimplify(ref Exp e)
{
e = e.TrySimplify();
}
public DotObjExp(Exp left, Identifier id)
{
m_left = left;
m_strId = id;
m_filerange = id.Location;
}
// Return true iff the given expression is allowed to have a null type
public static bool CanBeNullType(Exp e)
{
return (e is NullExp) || (e is IfExp) || (e is ArgExp) || (e is NamespaceExp);
}
public SimpleTypeSig(Exp e)
{
if (e != null)
m_filerange = e.Location;
m_oeValue = e;
}
public ArgExp(AST.EArgFlow eFlow, Exp exp)
{
Debug.Assert(exp != null);
Debug.Assert(!(exp is ArgExp), "ArgExp should never wrap an ArgExp");
m_exp = exp;
m_eFlow = eFlow;
}
public ThrowStatement(
Exp oeException // can be null for a rethrow
)
{
m_oeException = oeException;
}
// <e0, e1, e2 .... en>
// e_0 .. e_n-1 are StatementExp, that generate as Statements (to produce side effects)
// e_n is a normal expression, generated as an expression, to produce a value
public CompoundStmtExp(
StatementExp [] eList,
Exp eLast
)
{
Debug.Assert(eList != null);
Debug.Assert(eLast != null);
m_eList = eList;
m_eLast = eLast;
}
public SwitchStatement(
Exp expTest,
SwitchSection [] sections
)
{
m_expTest = expTest;
m_sections = sections;
m_proxy = null;
}
public OpEqualStmtExp(Exp expLeft, Exp expRight, BinaryExp.BinaryOp op)
{
Debug.Assert(false, "OpEqualStmtExp is obsolete"); //
m_op = op;
m_eLeft = expLeft;
m_expRight = expRight;
}
// For alias
public UsingDirective(string stAlias, Exp eNamespace)
{
Debug.Assert(stAlias != null);
Debug.Assert(eNamespace != null);
m_stAlias = stAlias;
m_eNamespace = eNamespace;
}
public PrePostIncDecStmtExp(
Exp e,
bool fPre, bool fInc)
{
m_exp = e;
m_fPre = fPre;
m_fInc = fInc;
}
public MethodCallExp(
Exp e, // may be null,
Identifier id,
ArgExp [] arParams
)
{
// m_objExp may be null _until_ we resolve this. And then it's either
// going to the implied 'this' ptr, a global func or a static func.
m_objExp = e;
m_idName = id;
m_arParams = (arParams == null) ? new ArgExp[0] : arParams;
// @todo - set in parser
m_filerange = id.Location;
}