CiSymbol Lookup(CiSymbolAccess expr)
{
CiSymbol symbol = expr.Symbol;
if (symbol is CiUnknownSymbol)
{
symbol = this.Symbols.Lookup(((CiUnknownSymbol)symbol).Name);
}
return(symbol);
}
CiExpr ICiExprVisitor.Visit(CiSymbolAccess expr)
{
CiSymbol symbol = Lookup(expr);
if (symbol is CiVar)
return new CiVarAccess { Var = (CiVar) symbol };
if (symbol is CiConst)
return GetValue((CiConst) symbol);
if (symbol is CiField) {
if (this.CurrentMethod.CallType == CiCallType.Static)
throw new ResolveException("Cannot access field from a static method");
symbol.Accept(this);
return CreateFieldAccess(new CiVarAccess { Var = this.CurrentMethod.This }, (CiField) symbol);
}
throw new ResolveException("Invalid expression");
}
CiExpr ParsePrimaryExpr()
{
if (See(CiToken.Increment) || See(CiToken.Decrement) || See(CiToken.Minus) || See(CiToken.Not)) {
CiToken op = this.CurrentToken;
NextToken();
CiExpr inner = ParsePrimaryExpr();
return new CiUnaryExpr { Op = op, Inner = inner };
}
if (Eat(CiToken.CondNot)) {
CiExpr inner = ParsePrimaryExpr();
return new CiCondNotExpr { Inner = inner };
}
CiExpr result;
if (See(CiToken.IntConstant)) {
result = new CiConstExpr(this.CurrentInt);
NextToken();
}
else if (See(CiToken.StringConstant)) {
result = new CiConstExpr(this.CurrentString);
NextToken();
}
else if (Eat(CiToken.LeftParenthesis)) {
result = ParseExpr();
Expect(CiToken.RightParenthesis);
}
else if (See(CiToken.Id)) {
string name = ParseId();
if (name == "BinaryResource")
result = ParseBinaryResource();
else {
CiSymbol symbol = this.Symbols.TryLookup(name);
if (symbol is CiMacro) {
Expand((CiMacro) symbol);
Expect(CiToken.LeftParenthesis);
result = ParseExpr();
Expect(CiToken.RightParenthesis);
}
else {
if (symbol == null)
symbol = new CiUnknownSymbol { Name = name };
result = new CiSymbolAccess { Symbol = symbol };
}
}
}
else if (Eat(CiToken.New)) {
CiType newType = ParseType();
if (!(newType is CiClassStorageType || newType is CiArrayStorageType))
throw new ParseException("'new' syntax error");
result = new CiNewExpr { NewType = newType };
}
else
throw new ParseException("Invalid expression");
for (;;) {
if (Eat(CiToken.Dot))
result = new CiUnknownMemberAccess { Parent = result, Name = ParseId() };
else if (Eat(CiToken.LeftParenthesis)) {
CiMethodCall call = new CiMethodCall();
call.Obj = result;
List<CiExpr> args = new List<CiExpr>();
if (!See(CiToken.RightParenthesis)) {
do
args.Add(ParseExpr());
while (Eat(CiToken.Comma));
}
Expect(CiToken.RightParenthesis);
call.Arguments = args.ToArray();
result = call;
}
else if (Eat(CiToken.LeftBracket)) {
CiExpr index = ParseExpr();
Expect(CiToken.RightBracket);
result = new CiIndexAccess { Parent = result, Index = index };
}
else if (See(CiToken.Increment) || See(CiToken.Decrement)) {
CiToken op = this.CurrentToken;
NextToken();
return new CiPostfixExpr { Inner = result, Op = op };
}
else
return result;
}
}
CiType LookupType(string name)
{
CiSymbol symbol = this.Symbols.TryLookup(name);
if (symbol is CiType)
{
return((CiType)symbol);
}
if (symbol is CiClass)
{
return new CiClassPtrType {
Name = name, Class = (CiClass)symbol
}
}
;
if (symbol == null)
{
CiType unknown = new CiUnknownType();
unknown.Name = name;
return(unknown);
}
throw new ParseException("{0} is not a type", name);
}
CiType ParseArrayType(CiType baseType)
{
if (Eat(CiToken.LeftBracket))
{
if (Eat(CiToken.RightBracket))
{
return new CiArrayPtrType {
ElementType = ParseArrayType(baseType)
}
}
;
CiExpr len = ParseExpr();
Expect(CiToken.RightBracket);
return(new CiArrayStorageType {
LengthExpr = len,
ElementType = ParseArrayType(baseType)
});
}
return(baseType);
}
CiType ParseType()
{
string baseName = ParseId();
CiType baseType;
if (Eat(CiToken.LeftParenthesis))
{
if (baseName == "string")
{
baseType = new CiStringStorageType {
LengthExpr = ParseExpr()
};
Expect(CiToken.RightParenthesis);
}
else
{
Expect(CiToken.RightParenthesis);
baseType = new CiClassStorageType {
Name = baseName, Class = new CiUnknownClass {
Name = baseName
}
};
}
}
else
{
baseType = LookupType(baseName);
}
return(ParseArrayType(baseType));
}
object ParseConstInitializer(CiType type)
{
if (type is CiArrayType)
{
Expect(CiToken.LeftBrace);
CiType elementType = ((CiArrayType)type).ElementType;
List <object> list = new List <object>();
if (!See(CiToken.RightBrace))
{
do
{
list.Add(ParseConstInitializer(elementType));
}while (Eat(CiToken.Comma));
}
Expect(CiToken.RightBrace);
return(list.ToArray());
}
return(ParseExpr());
}
CiConst ParseConst()
{
Expect(CiToken.Const);
CiConst konst = new CiConst();
konst.Type = ParseType();
konst.Name = ParseId();
Expect(CiToken.Assign);
konst.Value = ParseConstInitializer(konst.Type);
Expect(CiToken.Semicolon);
if (this.Symbols.Parent != null && konst.Type is CiArrayType)
{
this.ConstArrays.Add(konst);
konst.GlobalName = "CiConstArray_" + this.ConstArrays.Count;
}
return(konst);
}
CiBinaryResourceExpr ParseBinaryResource()
{
Expect(CiToken.LeftParenthesis);
CiExpr nameExpr = ParseExpr();
Expect(CiToken.RightParenthesis);
return(new CiBinaryResourceExpr {
NameExpr = nameExpr
});
}
CiExpr ParsePrimaryExpr()
{
if (See(CiToken.Increment) || See(CiToken.Decrement) || See(CiToken.Minus) || See(CiToken.Not))
{
CiToken op = this.CurrentToken;
NextToken();
CiExpr inner = ParsePrimaryExpr();
return(new CiUnaryExpr {
Op = op, Inner = inner
});
}
if (Eat(CiToken.CondNot))
{
CiExpr inner = ParsePrimaryExpr();
return(new CiCondNotExpr {
Inner = inner
});
}
CiExpr result;
if (See(CiToken.IntConstant))
{
result = new CiConstExpr(this.CurrentInt);
NextToken();
}
else if (See(CiToken.StringConstant))
{
result = new CiConstExpr(this.CurrentString);
NextToken();
}
else if (Eat(CiToken.LeftParenthesis))
{
result = ParseExpr();
Expect(CiToken.RightParenthesis);
}
else if (See(CiToken.Id))
{
string name = ParseId();
if (name == "BinaryResource")
{
result = ParseBinaryResource();
}
else
{
CiSymbol symbol = this.Symbols.TryLookup(name);
if (symbol is CiMacro)
{
Expand((CiMacro)symbol);
Expect(CiToken.LeftParenthesis);
result = ParseExpr();
Expect(CiToken.RightParenthesis);
}
else
{
if (symbol == null)
{
symbol = new CiUnknownSymbol {
Name = name
}
}
;
result = new CiSymbolAccess {
Symbol = symbol
};
}
}
}
else if (Eat(CiToken.New))
{
CiType newType = ParseType();
if (!(newType is CiClassStorageType || newType is CiArrayStorageType))
{
throw new ParseException("'new' syntax error");
}
result = new CiNewExpr {
NewType = newType
};
}
else
{
throw new ParseException("Invalid expression");
}
for (;;)
{
if (Eat(CiToken.Dot))
{
result = new CiUnknownMemberAccess {
Parent = result, Name = ParseId()
}
}
;
else if (Eat(CiToken.LeftParenthesis))
{
CiMethodCall call = new CiMethodCall();
call.Obj = result;
List <CiExpr> args = new List <CiExpr>();
if (!See(CiToken.RightParenthesis))
{
do
{
args.Add(ParseExpr());
}while (Eat(CiToken.Comma));
}
Expect(CiToken.RightParenthesis);
call.Arguments = args.ToArray();
result = call;
}
else if (Eat(CiToken.LeftBracket))
{
CiExpr index = ParseExpr();
Expect(CiToken.RightBracket);
result = new CiIndexAccess {
Parent = result, Index = index
};
}
else if (See(CiToken.Increment) || See(CiToken.Decrement))
{
CiToken op = this.CurrentToken;
NextToken();
return(new CiPostfixExpr {
Inner = result, Op = op
});
}
else
{
return(result);
}
}
}
CiExpr ParseMulExpr()
{
CiExpr left = ParsePrimaryExpr();
while (See(CiToken.Asterisk) || See(CiToken.Slash) || See(CiToken.Mod))
{
CiToken op = this.CurrentToken;
NextToken();
left = new CiBinaryExpr {
Left = left, Op = op, Right = ParsePrimaryExpr()
};
}
return(left);
}
CiExpr ParseAddExpr()
{
CiExpr left = ParseMulExpr();
while (See(CiToken.Plus) || See(CiToken.Minus))
{
CiToken op = this.CurrentToken;
NextToken();
left = new CiBinaryExpr {
Left = left, Op = op, Right = ParseMulExpr()
};
}
return(left);
}
CiExpr ParseShiftExpr()
{
CiExpr left = ParseAddExpr();
while (See(CiToken.ShiftLeft) || See(CiToken.ShiftRight))
{
CiToken op = this.CurrentToken;
NextToken();
left = new CiBinaryExpr {
Left = left, Op = op, Right = ParseAddExpr()
};
}
return(left);
}
CiExpr ParseRelExpr()
{
CiExpr left = ParseShiftExpr();
while (See(CiToken.Less) || See(CiToken.LessOrEqual) || See(CiToken.Greater) || See(CiToken.GreaterOrEqual))
{
CiToken op = this.CurrentToken;
NextToken();
left = new CiBoolBinaryExpr {
Left = left, Op = op, Right = ParseShiftExpr()
};
}
return(left);
}
CiExpr ParseEqualityExpr()
{
CiExpr left = ParseRelExpr();
while (See(CiToken.Equal) || See(CiToken.NotEqual))
{
CiToken op = this.CurrentToken;
NextToken();
left = new CiBoolBinaryExpr {
Left = left, Op = op, Right = ParseRelExpr()
};
}
return(left);
}
CiExpr ParseAndExpr()
{
CiExpr left = ParseEqualityExpr();
while (Eat(CiToken.And))
{
left = new CiBinaryExpr {
Left = left, Op = CiToken.And, Right = ParseEqualityExpr()
}
}
;
return(left);
}
CiExpr ParseXorExpr()
{
CiExpr left = ParseAndExpr();
while (Eat(CiToken.Xor))
{
left = new CiBinaryExpr {
Left = left, Op = CiToken.Xor, Right = ParseAndExpr()
}
}
;
return(left);
}
CiExpr ParseOrExpr()
{
CiExpr left = ParseXorExpr();
while (Eat(CiToken.Or))
{
left = new CiBinaryExpr {
Left = left, Op = CiToken.Or, Right = ParseXorExpr()
}
}
;
return(left);
}
CiExpr ParseCondAndExpr()
{
CiExpr left = ParseOrExpr();
while (Eat(CiToken.CondAnd))
{
left = new CiBoolBinaryExpr {
Left = left, Op = CiToken.CondAnd, Right = ParseOrExpr()
}
}
;
return(left);
}
CiExpr ParseCondOrExpr()
{
CiExpr left = ParseCondAndExpr();
while (Eat(CiToken.CondOr))
{
left = new CiBoolBinaryExpr {
Left = left, Op = CiToken.CondOr, Right = ParseCondAndExpr()
}
}
;
return(left);
}
CiExpr ParseExpr()
{
CiExpr left = ParseCondOrExpr();
if (Eat(CiToken.QuestionMark))
{
CiCondExpr result = new CiCondExpr();
result.Cond = left;
result.OnTrue = ParseExpr();
Expect(CiToken.Colon);
result.OnFalse = ParseExpr();
return(result);
}
return(left);
}
CiMaybeAssign ParseMaybeAssign()
{
CiExpr left = ParseExpr();
CiToken op = this.CurrentToken;
if (op == CiToken.Assign || op == CiToken.AddAssign || op == CiToken.SubAssign || op == CiToken.MulAssign || op == CiToken.DivAssign || op == CiToken.ModAssign ||
op == CiToken.AndAssign || op == CiToken.OrAssign || op == CiToken.XorAssign || op == CiToken.ShiftLeftAssign || op == CiToken.ShiftRightAssign)
{
NextToken();
CiAssign result = new CiAssign();
result.Target = left;
result.Op = op;
result.Source = ParseMaybeAssign();
return(result);
}
return(left);
}
ICiStatement ParseExprWithSideEffect()
{
ICiStatement result = ParseMaybeAssign() as ICiStatement;
if (result == null)
{
throw new ParseException("Useless expression");
}
return(result);
}
CiExpr ParseCond()
{
Expect(CiToken.LeftParenthesis);
CiExpr cond = ParseExpr();
Expect(CiToken.RightParenthesis);
return(cond);
}
void OpenScope()
{
this.Symbols = new SymbolTable {
Parent = this.Symbols
};
}
void CloseScope()
{
this.Symbols = this.Symbols.Parent;
}
CiVar ParseVar()
{
CiVar def = new CiVar();
def.Type = ParseType();
def.Name = ParseId();
if (Eat(CiToken.Assign))
{
def.InitialValue = ParseExpr();
}
Expect(CiToken.Semicolon);
this.Symbols.Add(def);
return(def);
}
ICiStatement ParseVarOrExpr()
{
string name = this.CurrentString;
CiSymbol symbol = this.Symbols.TryLookup(name);
if (symbol is CiMacro)
{
NextToken();
Expand((CiMacro)symbol);
return(ParseStatement());
}
// try var
StringBuilder sb = new StringBuilder();
this.CopyTo = sb;
try {
return(ParseVar());
}
catch (ParseException) {
}
finally {
this.CopyTo = null;
}
// try expr
this.CurrentString = name;
this.CurrentToken = CiToken.Id;
BeginExpand("ambigous code", sb.ToString(), null);
SetReader(new StringReader(sb.ToString()));
ICiStatement result = ParseExprWithSideEffect();
Expect(CiToken.Semicolon);
return(result);
}
CiNativeBlock ParseNativeBlock()
{
StringBuilder sb = new StringBuilder();
this.CopyTo = sb;
NextToken();
bool oneLine = true;
try {
if (See(CiToken.LeftBrace))
{
oneLine = false;
sb = new StringBuilder();
this.CopyTo = sb;
Expect(CiToken.LeftBrace);
}
int level = 1;
for (;;)
{
if (oneLine && See(CiToken.Semicolon) && level == 1)
{
break;
}
if (See(CiToken.EndOfFile))
{
throw new ParseException("Native block not terminated");
}
if (See(CiToken.LeftBrace))
{
level++;
}
else if (See(CiToken.RightBrace))
{
if (--level == 0)
{
break;
}
}
NextToken();
}
}
finally {
this.CopyTo = null;
}
NextToken();
Trace.Assert(sb[sb.Length - 1] == '}');
if (!oneLine)
{
sb.Length--;
}
else
{
sb.Append("\n\t");
}
return(new CiNativeBlock {
Content = sb.ToString()
});
}
CiSwitch ParseSwitch()
{
Expect(CiToken.LeftParenthesis);
CiSwitch result = new CiSwitch();
result.Value = ParseExpr();
Expect(CiToken.RightParenthesis);
Expect(CiToken.LeftBrace);
List <CiCase> cases = new List <CiCase>();
while (Eat(CiToken.Case))
{
List <object> values = new List <object>();
do
{
values.Add(ParseExpr());
Expect(CiToken.Colon);
} while (Eat(CiToken.Case));
if (See(CiToken.Default))
{
throw new ParseException("Please remove case before default");
}
CiCase kase = new CiCase {
Values = values.ToArray()
};
List <ICiStatement> statements = new List <ICiStatement>();
do
{
statements.Add(ParseStatement());
}while (!See(CiToken.Case) && !See(CiToken.Default) && !See(CiToken.Goto) && !See(CiToken.RightBrace));
kase.Body = statements.ToArray();
if (Eat(CiToken.Goto))
{
if (Eat(CiToken.Case))
{
kase.FallthroughTo = ParseExpr();
}
else if (Eat(CiToken.Default))
{
kase.FallthroughTo = null;
}
else
{
throw new ParseException("Expected goto case or goto default");
}
Expect(CiToken.Semicolon);
kase.Fallthrough = true;
}
cases.Add(kase);
}
if (cases.Count == 0)
{
throw new ParseException("Switch with no cases");
}
result.Cases = cases.ToArray();
if (Eat(CiToken.Default))
{
Expect(CiToken.Colon);
List <ICiStatement> statements = new List <ICiStatement>();
do
{
statements.Add(ParseStatement());
}while (!See(CiToken.RightBrace));
result.DefaultBody = statements.ToArray();
}
Expect(CiToken.RightBrace);
return(result);
}
ICiStatement ParseStatement()
{
while (Eat(CiToken.Macro))
{
this.Symbols.Add(ParseMacro());
}
if (See(CiToken.Id))
{
return(ParseVarOrExpr());
}
if (See(CiToken.LeftBrace))
{
OpenScope();
CiBlock result = ParseBlock();
CloseScope();
return(result);
}
if (Eat(CiToken.Break))
{
Expect(CiToken.Semicolon);
return(new CiBreak());
}
if (See(CiToken.Const))
{
CiConst konst = ParseConst();
this.Symbols.Add(konst);
return(konst);
}
if (Eat(CiToken.Continue))
{
Expect(CiToken.Semicolon);
return(new CiContinue());
}
if (Eat(CiToken.Delete))
{
CiExpr expr = ParseExpr();
Expect(CiToken.Semicolon);
return(new CiDelete {
Expr = expr
});
}
if (Eat(CiToken.Do))
{
CiDoWhile result = new CiDoWhile();
result.Body = ParseStatement();
Expect(CiToken.While);
result.Cond = ParseCond();
Expect(CiToken.Semicolon);
return(result);
}
if (Eat(CiToken.For))
{
Expect(CiToken.LeftParenthesis);
OpenScope();
CiFor result = new CiFor();
if (See(CiToken.Id))
{
result.Init = ParseVarOrExpr();
}
else
{
Expect(CiToken.Semicolon);
}
if (!See(CiToken.Semicolon))
{
result.Cond = ParseExpr();
}
Expect(CiToken.Semicolon);
if (!See(CiToken.RightParenthesis))
{
result.Advance = ParseExprWithSideEffect();
}
Expect(CiToken.RightParenthesis);
result.Body = ParseStatement();
CloseScope();
return(result);
}
if (Eat(CiToken.If))
{
CiIf result = new CiIf();
result.Cond = ParseCond();
result.OnTrue = ParseStatement();
if (Eat(CiToken.Else))
{
result.OnFalse = ParseStatement();
}
return(result);
}
if (See(CiToken.Native))
{
return(ParseNativeBlock());
}
if (Eat(CiToken.Return))
{
CiReturn result = new CiReturn();
if (this.CurrentMethod.Signature.ReturnType != CiType.Void)
{
result.Value = ParseExpr();
}
Expect(CiToken.Semicolon);
return(result);
}
if (Eat(CiToken.Switch))
{
return(ParseSwitch());
}
if (Eat(CiToken.Throw))
{
CiThrow result = new CiThrow();
result.Message = ParseExpr();
Expect(CiToken.Semicolon);
return(result);
}
if (Eat(CiToken.While))
{
CiWhile result = new CiWhile();
result.Cond = ParseCond();
result.Body = ParseStatement();
return(result);
}
throw new ParseException("Invalid statement");
}
CiBlock ParseBlock()
{
Expect(CiToken.LeftBrace);
List <ICiStatement> statements = new List <ICiStatement>();
while (!Eat(CiToken.RightBrace))
{
statements.Add(ParseStatement());
}
return(new CiBlock {
Statements = statements.ToArray()
});
}
CiParam CreateThis()
{
CiParam thiz = new CiParam();
thiz.Type = new CiClassPtrType {
Name = this.CurrentClass.Name, Class = this.CurrentClass
};
thiz.Name = "this";
this.Symbols.Add(thiz);
return(thiz);
}
CiType ParseReturnType()
{
if (Eat(CiToken.Void))
{
return(CiType.Void);
}
return(ParseType());
}
CiParam[] ParseParams()
{
Expect(CiToken.LeftParenthesis);
List <CiParam> paramz = new List <CiParam>();
if (!See(CiToken.RightParenthesis))
{
do
{
CiParam param = new CiParam();
param.Documentation = ParseDoc();
param.Type = ParseType();
param.Name = ParseId();
this.Symbols.Add(param);
paramz.Add(param);
} while (Eat(CiToken.Comma));
}
Expect(CiToken.RightParenthesis);
return(paramz.ToArray());
}
void ParseMethod(CiMethod method)
{
this.CurrentMethod = method;
OpenScope();
if (method.CallType != CiCallType.Static)
{
method.This = CreateThis();
}
method.Signature.Params = ParseParams();
if (method.CallType == CiCallType.Abstract)
{
Expect(CiToken.Semicolon);
}
else
{
method.Body = ParseBlock();
}
CloseScope();
this.CurrentMethod = null;
}
CiMethod ParseConstructor()
{
NextToken();
Expect(CiToken.LeftParenthesis);
Expect(CiToken.RightParenthesis);
OpenScope();
CiMethod method = new CiMethod(
CiType.Void, "<constructor>")
{
Class = this.CurrentClass,
CallType = CiCallType.Normal,
This = CreateThis()
};
this.CurrentMethod = method;
method.Body = ParseBlock();
CloseScope();
this.CurrentMethod = null;
return(method);
}
CiClass ParseClass()
{
CiClass klass = new CiClass();
klass.SourceFilename = this.Filename;
if (Eat(CiToken.Abstract))
{
klass.IsAbstract = true;
}
Expect(CiToken.Class);
klass.Name = ParseId();
if (Eat(CiToken.Colon))
{
klass.BaseClass = new CiUnknownClass {
Name = ParseId()
}
}
;
Expect(CiToken.LeftBrace);
OpenScope();
this.CurrentClass = klass;
klass.Members = this.Symbols;
while (!Eat(CiToken.RightBrace))
{
CiCodeDoc doc = ParseDoc();
CiVisibility visibility = CiVisibility.Private;
if (Eat(CiToken.Public))
{
visibility = CiVisibility.Public;
}
else if (Eat(CiToken.Internal))
{
visibility = CiVisibility.Internal;
}
CiSymbol symbol;
if (See(CiToken.Const))
{
symbol = ParseConst();
((CiConst)symbol).Class = klass;
}
else if (Eat(CiToken.Macro))
{
if (visibility != CiVisibility.Private)
{
throw new ParseException("Macros must be private");
}
symbol = ParseMacro();
}
else
{
if (See(CiToken.Id) && this.CurrentString == klass.Name)
{
if (klass.Constructor != null)
{
throw new ParseException("Duplicate constructor");
}
klass.Constructor = ParseConstructor();
continue;
}
CiCallType callType;
if (Eat(CiToken.Static))
{
callType = CiCallType.Static;
}
else if (Eat(CiToken.Abstract))
{
if (!klass.IsAbstract)
{
throw new ParseException("Abstract methods only allowed in abstract classes");
}
callType = CiCallType.Abstract;
if (visibility == CiVisibility.Private)
{
visibility = CiVisibility.Internal;
}
}
else if (Eat(CiToken.Virtual))
{
callType = CiCallType.Virtual;
if (visibility == CiVisibility.Private)
{
visibility = CiVisibility.Internal;
}
}
else if (Eat(CiToken.Override))
{
callType = CiCallType.Override;
if (visibility == CiVisibility.Private)
{
visibility = CiVisibility.Internal;
}
}
else
{
callType = CiCallType.Normal;
}
CiType type = ParseReturnType();
string name = ParseId();
if (See(CiToken.LeftParenthesis))
{
CiMethod method = new CiMethod(type, name)
{
Class = klass,
CallType = callType
};
ParseMethod(method);
symbol = method;
}
else
{
if (visibility != CiVisibility.Private)
{
throw new ParseException("Fields must be private");
}
if (callType != CiCallType.Normal)
{
throw new ParseException("Fields cannot be static, abstract, virtual or override");
}
if (type == CiType.Void)
{
throw new ParseException("Field is void");
}
Expect(CiToken.Semicolon);
symbol = new CiField {
Class = klass, Type = type, Name = name
};
}
}
symbol.Documentation = doc;
symbol.Visibility = visibility;
klass.Members.Add(symbol);
}
this.CurrentClass = null;
CloseScope();
klass.ConstArrays = this.ConstArrays.ToArray();
this.ConstArrays.Clear();
return(klass);
}
CiDelegate ParseDelegate()
{
CiDelegate del = new CiDelegate();
Expect(CiToken.Delegate);
del.ReturnType = ParseReturnType();
del.Name = ParseId();
OpenScope();
del.Params = ParseParams();
CloseScope();
Expect(CiToken.Semicolon);
return(del);
}
public void Parse(string filename, TextReader reader)
{
Open(filename, reader);
while (!See(CiToken.EndOfFile))
{
CiCodeDoc doc = ParseDoc();
bool pub = Eat(CiToken.Public);
CiSymbol symbol;
if (See(CiToken.Enum))
{
symbol = ParseEnum();
}
else if (See(CiToken.Class) || See(CiToken.Abstract))
{
symbol = ParseClass();
}
else if (See(CiToken.Delegate))
{
symbol = ParseDelegate();
}
else
{
throw new ParseException("Expected class, enum or delegate");
}
symbol.Documentation = doc;
symbol.Visibility = pub ? CiVisibility.Public : CiVisibility.Internal;
this.Symbols.Add(symbol);
}
}
public CiProgram Program
{
get
{
return(new CiProgram {
Globals = this.Symbols
});
}
}
}
}
CiExpr ICiExprVisitor.Visit(CiSymbolAccess expr)
{
CiSymbol symbol = Lookup(expr);
if (symbol is CiVar)
{
return new CiVarAccess {
Var = (CiVar)symbol
}
}
;
if (symbol is CiConst)
{
return(GetValue((CiConst)symbol));
}
if (symbol is CiField)
{
if (this.CurrentMethod.CallType == CiCallType.Static)
{
throw new ResolveException("Cannot access field from a static method");
}
symbol.Accept(this);
return(CreateFieldAccess(new CiVarAccess {
Var = this.CurrentMethod.This
}, (CiField)symbol));
}
throw new ResolveException("Invalid expression");
}
CiExpr ICiExprVisitor.Visit(CiUnknownMemberAccess expr)
{
if (expr.Parent is CiSymbolAccess)
{
CiSymbol symbol = Lookup((CiSymbolAccess)expr.Parent);
if (symbol is CiEnum)
{
return(new CiConstExpr(((CiEnum)symbol).LookupMember(expr.Name)));
}
if (symbol is CiClass)
{
symbol = ((CiClass)symbol).Members.Lookup(expr.Name);
if (symbol is CiConst)
{
return(GetValue((CiConst)symbol));
}
throw new ResolveException("Cannot access " + expr.Name);
}
}
CiExpr parent = Resolve(expr.Parent);
CiSymbol member = parent.Type.LookupMember(expr.Name);
member.Accept(this);
if (member is CiField)
{
return(CreateFieldAccess(parent, (CiField)member));
}
if (member is CiProperty)
{
CiProperty prop = (CiProperty)member;
if (parent is CiConstExpr)
{
if (prop == CiLibrary.LowByteProperty)
{
return(new CiConstExpr((byte)GetConstInt(parent)));
}
if (prop == CiLibrary.SByteProperty)
{
return(new CiConstExpr((int)(sbyte)GetConstInt(parent)));
}
if (prop == CiLibrary.StringLengthProperty)
{
return(new CiConstExpr(((string)((CiConstExpr)parent).Value).Length));
}
}
return(new CiPropertyAccess {
Obj = parent, Property = prop
});
}
if (member is CiConst)
{
return(new CiConstExpr(((CiConst)member).Value));
}
throw new ResolveException(member.ToString());
}
CiExpr ICiExprVisitor.Visit(CiIndexAccess expr)
{
CiExpr parent = Resolve(expr.Parent);
CiExpr index = Coerce(Resolve(expr.Index), CiIntType.Value);
if (parent.Type is CiArrayType)
{
return new CiArrayAccess {
Array = parent, Index = index
}
}
;
if (parent.Type is CiStringType)
{
if (parent is CiConstExpr && index is CiConstExpr)
{
string s = (string)((CiConstExpr)parent).Value;
int i = GetConstInt(index);
if (i < s.Length)
{
return(new CiConstExpr((int)s[i]));
}
}
return(new CiMethodCall {
Method = CiLibrary.CharAtMethod,
Obj = parent,
Arguments = new CiExpr[1] {
index
}
});
}
throw new ResolveException("Indexed object is neither array or string");
}
void ICiSymbolVisitor.Visit(CiDelegate del)
{
del.ReturnType = Resolve(del.ReturnType);
foreach (CiParam param in del.Params)
{
param.Type = Resolve(param.Type);
}
}
CiType ICiTypeVisitor.Visit(CiDelegate del)
{
((ICiSymbolVisitor)this).Visit(del);
return(del);
}
void ResolveObj(CiMethodCall expr)
{
if (expr.Obj is CiSymbolAccess)
{
// Foo(...)
CiMethod method = Lookup((CiSymbolAccess)expr.Obj) as CiMethod;
if (method != null)
{
expr.Method = method;
if (method.CallType == CiCallType.Static)
{
expr.Obj = null;
}
else
{
if (this.CurrentMethod.CallType == CiCallType.Static)
{
throw new ResolveException("Cannot call instance method from a static method");
}
expr.Obj = Coerce(new CiVarAccess {
Var = this.CurrentMethod.This
}, new CiClassPtrType {
Class = method.Class
});
CheckCopyPtr(method.This.Type, expr.Obj);
}
return;
}
}
else if (expr.Obj is CiUnknownMemberAccess)
{
// ???.Foo(...)
CiUnknownMemberAccess uma = (CiUnknownMemberAccess)expr.Obj;
if (uma.Parent is CiSymbolAccess)
{
CiClass klass = Lookup((CiSymbolAccess)uma.Parent) as CiClass;
if (klass != null)
{
// Class.Foo(...)
CiMethod method = klass.Members.Lookup(uma.Name) as CiMethod;
if (method != null)
{
if (method.CallType != CiCallType.Static)
{
throw new ResolveException("{0} is a non-static method", method.Name);
}
expr.Method = method;
expr.Obj = null;
return;
}
}
}
CiExpr obj = Resolve(uma.Parent);
{
CiMethod method = obj.Type.LookupMember(uma.Name) as CiMethod;
if (method != null)
{
// obj.Foo(...)
if (method.CallType == CiCallType.Static)
{
throw new ResolveException("{0} is a static method", method.Name);
}
if (method.This != null)
{
// user-defined method
CheckCopyPtr(method.This.Type, obj);
obj = Coerce(obj, new CiClassPtrType {
Class = method.Class
});
}
expr.Method = method;
expr.Obj = obj;
return;
}
}
}
expr.Obj = Resolve(expr.Obj);
if (!(expr.Obj.Type is CiDelegate))
{
throw new ResolveException("Invalid call");
}
if (expr.Obj.HasSideEffect)
{
throw new ResolveException("Side effects not allowed in delegate call");
}
}
void CoerceArguments(CiMethodCall expr)
{
expr.Signature.Accept(this);
CiParam[] paramz = expr.Signature.Params;
if (expr.Arguments.Length != paramz.Length)
{
throw new ResolveException("Invalid number of arguments for {0}, expected {1}, got {2}", expr.Signature.Name, paramz.Length, expr.Arguments.Length);
}
for (int i = 0; i < paramz.Length; i++)
{
CiExpr arg = Resolve(expr.Arguments[i]);
CheckCopyPtr(paramz[i].Type, arg);
expr.Arguments[i] = Coerce(arg, paramz[i].Type);
}
}
CiExpr ICiExprVisitor.Visit(CiMethodCall expr)
{
ResolveObj(expr);
CoerceArguments(expr);
if (expr.Method != null && expr.Method != this.CurrentMethod)
{
if (expr.Method.IsMutator)
{
MarkWritable(expr.Obj);
}
expr.Method.CalledBy.Add(this.CurrentMethod);
this.CurrentMethod.Calls.Add(expr.Method);
}
return(expr);
}
CiExpr ICiExprVisitor.Visit(CiUnaryExpr expr)
{
CiExpr resolved;
if (expr.Op == CiToken.Increment || expr.Op == CiToken.Decrement)
{
resolved = ResolveLValue(expr.Inner);
}
else
{
resolved = Resolve(expr.Inner);
}
expr.Inner = Coerce(resolved, CiIntType.Value);
if (expr.Op == CiToken.Minus && expr.Inner is CiConstExpr)
{
return(new CiConstExpr(-GetConstInt(expr.Inner)));
}
return(expr);
}
CiExpr ICiExprVisitor.Visit(CiCondNotExpr expr)
{
expr.Inner = Coerce(Resolve(expr.Inner), CiBoolType.Value);
return(expr);
}
CiExpr ICiExprVisitor.Visit(CiPostfixExpr expr)
{
expr.Inner = Coerce(ResolveLValue(expr.Inner), CiIntType.Value);
return(expr);
}
CiExpr ICiExprVisitor.Visit(CiBinaryExpr expr)
{
CiExpr left = Resolve(expr.Left);
CiExpr right = Resolve(expr.Right);
if (expr.Op == CiToken.Plus && (left.Type is CiStringType || right.Type is CiStringType))
{
if (!(left is CiConstExpr && right is CiConstExpr))
{
throw new ResolveException("String concatenation allowed only for constants. Consider using +=");
}
string a = GetConstString(left);
string b = GetConstString(right);
return(new CiConstExpr(a + b));
}
left = Coerce(left, CiIntType.Value);
right = Coerce(right, CiIntType.Value);
if (right is CiConstExpr)
{
int b = GetConstInt(right);
if (left is CiConstExpr)
{
int a = GetConstInt(left);
switch (expr.Op)
{
case CiToken.Asterisk: a *= b; break;
case CiToken.Slash: a /= b; break;
case CiToken.Mod: a %= b; break;
case CiToken.And: a &= b; break;
case CiToken.ShiftLeft: a <<= b; break;
case CiToken.ShiftRight: a >>= b; break;
case CiToken.Plus: a += b; break;
case CiToken.Minus: a -= b; break;
case CiToken.Or: a |= b; break;
case CiToken.Xor: a ^= b; break;
}
return(new CiConstExpr(a));
}
if (expr.Op == CiToken.And && (b & ~0xff) == 0)
{
CiCoercion c = left as CiCoercion;
if (c != null && c.Inner.Type == CiByteType.Value)
{
left = (CiExpr)c.Inner;
}
}
}
expr.Left = left;
expr.Right = right;
return(expr);
}
static CiType FindCommonType(CiExpr expr1, CiExpr expr2)
{
CiType type1 = expr1.Type;
CiType type2 = expr2.Type;
if (type1.Equals(type2))
{
return(type1);
}
if ((type1 == CiIntType.Value && type2 == CiByteType.Value) ||
(type1 == CiByteType.Value && type2 == CiIntType.Value))
{
return(CiIntType.Value);
}
CiType type = type1.Ptr;
if (type != null)
{
return(type); // stg, ptr || stg, null
}
type = type2.Ptr;
if (type != null)
{
return(type); // ptr, stg || null, stg
}
if (type1 != CiType.Null)
{
return(type1); // ptr, null
}
if (type2 != CiType.Null)
{
return(type2); // null, ptr
}
throw new ResolveException("Incompatible types");
}
CiExpr ICiExprVisitor.Visit(CiBoolBinaryExpr expr)
{
CiExpr left = Resolve(expr.Left);
CiExpr right = Resolve(expr.Right);
CiType type;
switch (expr.Op)
{
case CiToken.CondAnd:
case CiToken.CondOr:
type = CiBoolType.Value;
break;
case CiToken.Equal:
case CiToken.NotEqual:
type = FindCommonType(left, right);
break;
default:
type = CiIntType.Value;
break;
}
expr.Left = Coerce(left, type);
expr.Right = Coerce(right, type);
CiConstExpr cleft = expr.Left as CiConstExpr;
if (cleft != null)
{
switch (expr.Op)
{
case CiToken.CondAnd:
return((bool)cleft.Value ? expr.Right : new CiConstExpr(false));
case CiToken.CondOr:
return((bool)cleft.Value ? new CiConstExpr(true) : expr.Right);
case CiToken.Equal:
case CiToken.NotEqual:
CiConstExpr cright = expr.Right as CiConstExpr;
if (cright != null)
{
bool eq = object.Equals(cleft.Value, cright.Value);
return(new CiConstExpr(expr.Op == CiToken.Equal ? eq : !eq));
}
break;
default:
if (expr.Right is CiConstExpr)
{
int a = GetConstInt(cleft);
int b = GetConstInt(expr.Right);
bool result;
switch (expr.Op)
{
case CiToken.Less: result = a < b; break;
case CiToken.LessOrEqual: result = a <= b; break;
case CiToken.Greater: result = a > b; break;
case CiToken.GreaterOrEqual: result = a >= b; break;
default: return(expr);
}
return(new CiConstExpr(result));
}
break;
}
}
return(expr);
}
CiExpr ICiExprVisitor.Visit(CiCondExpr expr)
{
expr.Cond = Coerce(Resolve(expr.Cond), CiBoolType.Value);
CiExpr expr1 = Resolve(expr.OnTrue);
CiExpr expr2 = Resolve(expr.OnFalse);
expr.ResultType = FindCommonType(expr1, expr2);
expr.OnTrue = Coerce(expr1, expr.ResultType);
expr.OnFalse = Coerce(expr2, expr.ResultType);
CiConstExpr konst = expr.Cond as CiConstExpr;
if (konst != null)
{
return((bool)konst.Value ? expr.OnTrue : expr.OnFalse);
}
return(expr);
}
CiExpr ICiExprVisitor.Visit(CiBinaryResourceExpr expr)
{
string name = (string)ResolveConstExpr(expr.NameExpr, CiStringPtrType.Value);
CiBinaryResource resource;
if (!this.BinaryResources.TryGetValue(name, out resource))
{
resource = new CiBinaryResource();
resource.Name = name;
resource.Content = File.ReadAllBytes(FindFile(name));
resource.Type = new CiArrayStorageType {
ElementType = CiByteType.Value, Length = resource.Content.Length
};
this.BinaryResources.Add(name, resource);
}
expr.Resource = resource;
return(expr);
}
CiExpr ICiExprVisitor.Visit(CiNewExpr expr)
{
CiType type = expr.NewType;
CiClassStorageType classStorageType = type as CiClassStorageType;
if (classStorageType != null)
{
classStorageType.Class = ResolveClass(classStorageType.Class);
classStorageType.Class.IsAllocated = true;
}
else
{
CiArrayStorageType arrayStorageType = (CiArrayStorageType)type;
arrayStorageType.ElementType = Resolve(arrayStorageType.ElementType);
arrayStorageType.LengthExpr = Coerce(Resolve(arrayStorageType.LengthExpr), CiIntType.Value);
}
return(expr);
}
CiExpr Resolve(CiExpr expr)
{
return(expr.Accept(this));
}
void ICiSymbolVisitor.Visit(CiField field)
{
field.Type = Resolve(field.Type);
}
bool Resolve(ICiStatement[] statements)
{
bool reachable = true;
foreach (ICiStatement child in statements)
{
if (!reachable)
{
throw new ResolveException("Unreachable statement");
}
child.Accept(this);
reachable = child.CompletesNormally;
}
return(reachable);
}
void ICiStatementVisitor.Visit(CiBlock statement)
{
statement.CompletesNormally = Resolve(statement.Statements);
}
void ICiStatementVisitor.Visit(CiConst statement)
{
}
void ICiStatementVisitor.Visit(CiVar statement)
{
statement.Type = Resolve(statement.Type);
if (statement.InitialValue != null)
{
CiType type = statement.Type;
CiExpr initialValue = Resolve(statement.InitialValue);
CheckCopyPtr(type, initialValue);
if (type is CiArrayStorageType)
{
type = ((CiArrayStorageType)type).ElementType;
CiConstExpr ce = Coerce(initialValue, type) as CiConstExpr;
if (ce == null)
{
throw new ResolveException("Array initializer is not constant");
}
statement.InitialValue = ce;
if (type == CiBoolType.Value)
{
if (!false.Equals(ce.Value))
{
throw new ResolveException("Bool arrays can only be initialized with false");
}
}
else if (type == CiByteType.Value)
{
if (!((byte)0).Equals(ce.Value))
{
throw new ResolveException("Byte arrays can only be initialized with zero");
}
}
else if (type == CiIntType.Value)
{
if (!0.Equals(ce.Value))
{
throw new ResolveException("Int arrays can only be initialized with zero");
}
}
else
{
throw new ResolveException("Invalid array initializer");
}
}
else
{
statement.InitialValue = Coerce(initialValue, type);
}
}
}
void ICiStatementVisitor.Visit(CiExpr statement)
{
Resolve((CiExpr)statement);
}
void ICiStatementVisitor.Visit(CiAssign statement)
{
statement.Target = ResolveLValue(statement.Target);
if (statement.Target is CiVarAccess && ((CiVarAccess)statement.Target).Var == this.CurrentMethod.This)
{
throw new ResolveException("Cannot assign to this");
}
CiMaybeAssign source = statement.Source;
if (source is CiAssign)
{
Resolve((ICiStatement)source);
}
else
{
source = Resolve((CiExpr)source);
}
CiType type = statement.Target.Type;
CheckCopyPtr(type, source);
statement.Source = Coerce(source, type);
if (statement.Op != CiToken.Assign && type != CiIntType.Value && type != CiByteType.Value)
{
if (statement.Op == CiToken.AddAssign && type is CiStringStorageType && statement.Source.Type is CiStringType)
{
} // OK
else
{
throw new ResolveException("Invalid compound assignment");
}
}
}
void ICiStatementVisitor.Visit(CiDelete statement)
{
statement.Expr = Resolve(statement.Expr);
ICiPtrType type = statement.Expr.Type as ICiPtrType;
if (type == null)
{
throw new ResolveException("'delete' takes a class or array pointer");
}
if (statement.Expr.HasSideEffect)
{
throw new ResolveException("Side effects not allowed in 'delete'");
}
this.WritablePtrTypes.Add(type);
}
void ICiStatementVisitor.Visit(CiBreak statement)
{
if (this.CurrentLoopOrSwitch == null)
{
throw new ResolveException("break outside loop and switch");
}
this.CurrentLoopOrSwitch.CompletesNormally = true;
}
void ICiStatementVisitor.Visit(CiContinue statement)
{
if (this.CurrentLoop == null)
{
throw new ResolveException("continue outside loop");
}
}
void ResolveLoop(CiLoop statement)
{
statement.CompletesNormally = false;
if (statement.Cond != null)
{
statement.Cond = Coerce(Resolve(statement.Cond), CiBoolType.Value);
statement.CompletesNormally = !statement.Cond.IsConst(false);
}
CiLoop oldLoop = this.CurrentLoop;
CiCondCompletionStatement oldLoopOrSwitch = this.CurrentLoopOrSwitch;
this.CurrentLoopOrSwitch = this.CurrentLoop = statement;
Resolve(statement.Body);
this.CurrentLoop = oldLoop;
this.CurrentLoopOrSwitch = oldLoopOrSwitch;
}
void ICiStatementVisitor.Visit(CiDoWhile statement)
{
ResolveLoop(statement);
}
void ICiStatementVisitor.Visit(CiFor statement)
{
if (statement.Init != null)
{
Resolve(statement.Init);
}
if (statement.Advance != null)
{
Resolve(statement.Advance);
}
ResolveLoop(statement);
}
void ICiStatementVisitor.Visit(CiIf statement)
{
statement.Cond = Coerce(Resolve(statement.Cond), CiBoolType.Value);
Resolve(statement.OnTrue);
if (statement.OnFalse != null)
{
Resolve(statement.OnFalse);
statement.CompletesNormally = statement.OnTrue.CompletesNormally || statement.OnFalse.CompletesNormally;
}
else
{
statement.CompletesNormally = true;
}
}
void ICiStatementVisitor.Visit(CiNativeBlock statement)
{
}
void ICiStatementVisitor.Visit(CiReturn statement)
{
CiType type = this.CurrentMethod.Signature.ReturnType;
if (type != CiType.Void)
{
statement.Value = Coerce(Resolve(statement.Value), type);
}
}
void ICiStatementVisitor.Visit(CiSwitch statement)
{
statement.Value = Resolve(statement.Value);
CiType type = statement.Value.Type;
CiCondCompletionStatement oldLoopOrSwitch = this.CurrentLoopOrSwitch;
this.CurrentLoopOrSwitch = statement;
HashSet <object> values = new HashSet <object>();
CiCase fallthroughFrom = null;
foreach (CiCase kase in statement.Cases)
{
for (int i = 0; i < kase.Values.Length; i++)
{
kase.Values[i] = ResolveConstExpr((CiExpr)kase.Values[i], type);
if (!values.Add(kase.Values[i]))
{
throw new ResolveException("Duplicate case value");
}
}
if (fallthroughFrom != null)
{
if (fallthroughFrom.FallthroughTo == null)
{
throw new ResolveException("goto default followed by case");
}
if (!ResolveConstExpr(fallthroughFrom.FallthroughTo, type).Equals(kase.Values[0]))
{
throw new ResolveException("goto case doesn't match the next case");
}
}
bool reachable = Resolve(kase.Body);
if (kase.Fallthrough)
{
if (!reachable)
{
throw new ResolveException("goto is not reachable");
}
fallthroughFrom = kase;
}
else
{
if (reachable)
{
throw new ResolveException("case must end with break, return, throw or goto");
}
fallthroughFrom = null;
}
}
if (statement.DefaultBody != null)
{
if (fallthroughFrom != null && fallthroughFrom.FallthroughTo != null)
{
throw new ResolveException("goto case followed by default");
}
bool reachable = Resolve(statement.DefaultBody);
if (reachable)
{
throw new ResolveException("default must end with break, return, throw or goto");
}
}
else
{
if (fallthroughFrom != null)
{
throw new ResolveException("goto cannot be the last statement in switch");
}
}
this.CurrentLoopOrSwitch = oldLoopOrSwitch;
}
void ICiStatementVisitor.Visit(CiThrow statement)
{
statement.Message = Coerce(Resolve(statement.Message), CiStringPtrType.Value);
this.ThrowingMethods.Add(this.CurrentMethod);
}
void ICiStatementVisitor.Visit(CiWhile statement)
{
ResolveLoop(statement);
}
void Resolve(ICiStatement statement)
{
statement.Accept(this);
}
void ICiSymbolVisitor.Visit(CiMethod method)
{
this.CurrentMethod = method;
Resolve(method.Signature);
if (method.CallType != CiCallType.Abstract)
{
Resolve(method.Body);
if (method.Signature.ReturnType != CiType.Void && method.Body.CompletesNormally)
{
throw new ResolveException("Method can complete without a return value");
}
}
this.CurrentMethod = null;
}
void ResolveBase(CiClass klass)
{
if (klass.BaseClass != null)
{
klass.BaseClass = ResolveClass(klass.BaseClass);
klass.Members.Parent = klass.BaseClass.Members;
}
}
void ICiSymbolVisitor.Visit(CiClass klass)
{
this.CurrentClass = klass;
this.Symbols = klass.Members;
if (klass.Constructor != null)
{
klass.Constructor.Accept(this);
}
foreach (CiSymbol member in klass.Members)
{
member.Accept(this);
}
klass.BinaryResources = this.BinaryResources.Values.ToArray();
this.BinaryResources.Clear();
this.Symbols = this.Symbols.Parent;
this.CurrentClass = null;
}
CiSymbol Lookup(CiSymbolAccess expr)
{
CiSymbol symbol = expr.Symbol;
if (symbol is CiUnknownSymbol)
symbol = this.Symbols.Lookup(((CiUnknownSymbol) symbol).Name);
return symbol;
}