/// <summary> Makes constant values specified as arithmetic expressions comply with the current
/// langauge syntax (adds enum type name qualifiers and type casts when necessary, eliminates
/// sizeof() operators when unsupported, etc.) </summary>
public static string TranslateConstExpr(TpmConstExpr ce, TpmEnum enclosingEnum = null)
{
var nameDelimiters = new char[] { ' ', ',', '{', '}',
'(', ')', '+', '-', '<', '*', '/', '`' };
string suffix = TargetLang.Java ? ".toInt()" : "";
string expr = ce.Expr;
string[] tokens = expr.Split(nameDelimiters);
bool sizeofOccurred = false,
commentNeeded = false;
foreach (string token in tokens)
{
if (token.Length == 0)
{
continue;
}
if (token == "sizeof")
{
Debug.Assert(!sizeofOccurred);
sizeofOccurred = true;
continue;
}
if (Expression.IsNumber(token))
{
if (token == "00")
{
Debug.Assert(expr == token);
expr = "0";
}
Debug.Assert(!sizeofOccurred);
continue;
}
TpmNamedConstant nc = TpmTypes.LookupConstant(token);
if (enclosingEnum != null && nc?.EnclosingEnum == enclosingEnum)
{
// Members of the enum being processed do not need to be qualified
Debug.Assert(token == nc.SpecName);
expr = expr.Replace(token, nc.Name + suffix);
continue;
}
if (!TpmTypes.ContainsConstant(token))
{
// This must be a type name operand of sizeof()
Debug.Assert(sizeofOccurred);
sizeofOccurred = false;
TpmType t = TpmTypes.Lookup(token);
if (t is TpmStruct || TargetLang.IsOneOf(Lang.Java, Lang.JS, Lang.Py))
{
string sizeofExpr = "sizeof(" + token + ")";
Debug.Assert(expr.Contains(sizeofExpr));
commentNeeded = TargetLang.Py;
string origExpr = TargetLang.Py ? "" : $"/*{sizeofExpr}*/";
expr = expr.Replace(sizeofExpr, $"0x{t.GetSize():X}{origExpr}");
}
else if (TargetLang.DotNet)
{
expr = expr.Replace(token, t.StripTypedefs().Name);
}
}
else
{
nc = TpmTypes.LookupConstant(token);
var translated = nc.QualifiedName + suffix;
if (!TargetLang.IsGenerated(nc.EnclosingEnum))
{
translated = nc.NumericValue.ToString();
if (!TargetLang.Py)
{
translated += "/*" + token + "*/";
}
else
{
commentNeeded = true;
}
}
expr = expr.Replace(token, translated);
}
} // foreach token
if (TargetLang.DotNet && expr.Contains("<<"))
{
// Shift operator in .Net requires right operand of type 'int' and unsigned left one.
int curPos = 0;
expr = expr.Replace(" << ", "<<");
do
{
int pos = expr.IndexOf("<<", curPos);
if (pos == -1)
{
break;
}
curPos = pos + 2 + 6; // Add sizes of "<<" and "(uint)"
while (char.IsLetterOrDigit(expr[--pos]) || expr[pos] == '.')
{
continue;
}
expr = expr.Insert(pos + 1, "(uint)");
} while (true);
expr = expr.Replace("<<", " << (int)");
}
if (commentNeeded)
{
expr += $" # {ce.Expr}";
}
return(expr);
} // TranslateConstExpr()
/// <remarks> If this method goes into an infinite loop, this usually means that
/// the Part 2, or Vendor Specicfic part of the TPM 2.0 spec added a new constant
/// value defined not in a table, but rather in a NOTE. In this case this definition
/// needs to be manually added into the ImplementationConstants array. </remarks>
public static int Eval(string val)
{
if (IsNumber(val))
{
return(Convert.ToInt32(val, val.ToLower().StartsWith("0x") ? 16 : 10));
}
if (TpmTypes.ContainsConstant(val))
{
return(TpmTypes.LookupConstant(val).NumericValue);
}
var tokens = Tokenize(val);
var ops = new Stack <Operator>();
var values = new Stack <Operand>();
for (int i = 0; i < tokens.Length; ++i)
{
var tok = tokens[i];
if (tok is Operand)
{
values.Push((Operand)tok);
continue;
}
var op = (Operator)tok;
if (op.Is(OpCode.Sizeof))
{
Debug.Assert(tokens.Length > i + 2);
string typeName = (tokens[i + 2] as Operand).Value;
Debug.Assert(TpmTypes.Contains(typeName));
var e = TpmTypes.Lookup(typeName);
// Workaround for _PRIVATE max size
values.Push(new Operand(typeName == "_PRIVATE" ? 1024 : e.GetSize()));
i += 3;
continue;
}
if (ops.Count == 0 || op.Is(OpCode.LeftParen) || ops.Peek() < op)
{
Debug.Assert(!op.Is(OpCode.RightParen));
ops.Push(op);
continue;
}
else
{
do
{
Operator prevOp = ops.Pop();
if (prevOp.Is(OpCode.LeftParen))
{
Debug.Assert(op.Is(OpCode.RightParen));
break;
}
prevOp.Apply(values);
}while (ops.Count > 0 && ops.Peek() >= op);
if (!op.Is(OpCode.RightParen))
{
ops.Push(op);
}
}
}
while (ops.Count > 0)
{
ops.Pop().Apply(values);
}
Debug.Assert(values.Count == 1);
int res = values.Pop().NumericValue;
return(res);
}
