2 // support.cs: Support routines to work around the fact that System.Reflection.Emit
3 // can not introspect types that are being constructed
6 // Miguel de Icaza (miguel@ximian.com)
8 // (C) 2001 Ximian, Inc (http://www.ximian.com)
14 using System.Reflection;
15 using System.Collections;
16 using System.Reflection.Emit;
17 using System.Globalization;
19 namespace Mono.CSharp {
21 public interface ParameterData {
22 Type ParameterType (int pos);
24 string ParameterName (int pos);
25 string ParameterDesc (int pos);
26 Parameter.Modifier ParameterModifier (int pos);
29 public class ReflectionParameters : ParameterData {
31 bool last_arg_is_params = false;
33 public ReflectionParameters (ParameterInfo [] pi)
38 int count = pi.Length-1;
41 attrs = pi [count].GetCustomAttributes (TypeManager.param_array_type, true);
46 if (attrs.Length == 0)
49 last_arg_is_params = true;
53 public Type ParameterType (int pos)
55 if (last_arg_is_params && pos >= pi.Length - 1)
56 return pi [pi.Length - 1].ParameterType;
58 Type t = pi [pos].ParameterType;
64 public string ParameterName (int pos)
66 if (last_arg_is_params && pos >= pi.Length - 1)
67 return pi [pi.Length - 1].Name;
72 public string ParameterDesc (int pos)
74 StringBuilder sb = new StringBuilder ();
79 Type partype = ParameterType (pos);
81 partype = TypeManager.GetElementType (partype);
88 if (pos >= pi.Length - 1 && last_arg_is_params)
89 sb.Append ("params ");
91 sb.Append (TypeManager.CSharpName (partype));
93 return sb.ToString ();
97 public Parameter.Modifier ParameterModifier (int pos)
102 if (last_arg_is_params)
103 return Parameter.Modifier.PARAMS;
105 Type t = pi [pos].ParameterType;
107 if ((pi [pos].Attributes & ParameterAttributes.Out) != 0)
108 return Parameter.Modifier.ISBYREF | Parameter.Modifier.OUT;
110 return Parameter.Modifier.ISBYREF | Parameter.Modifier.REF;
113 return Parameter.Modifier.NONE;
124 public class InternalParameters : ParameterData {
127 public readonly Parameters Parameters;
129 public InternalParameters (Type [] param_types, Parameters parameters)
131 this.param_types = param_types;
132 this.Parameters = parameters;
135 public InternalParameters (DeclSpace ds, Parameters parameters)
136 : this (parameters.GetParameterInfo (ds), parameters)
142 if (param_types == null)
145 return param_types.Length;
149 Parameter GetParameter (int pos)
151 Parameter [] fixed_pars = Parameters.FixedParameters;
152 if (fixed_pars != null){
153 int len = fixed_pars.Length;
155 return Parameters.FixedParameters [pos];
158 return Parameters.ArrayParameter;
161 public Type ParameterType (int pos)
163 if (param_types == null)
166 return GetParameter (pos).ExternalType ();
170 public string ParameterName (int pos)
172 return GetParameter (pos).Name;
175 public string ParameterDesc (int pos)
177 string tmp = String.Empty;
178 Parameter p = GetParameter (pos);
181 // We need to and for REF/OUT, because if either is set the
182 // extra flag ISBYREF will be set as well
184 if ((p.ModFlags & Parameter.Modifier.REF) != 0)
186 else if ((p.ModFlags & Parameter.Modifier.OUT) != 0)
188 else if (p.ModFlags == Parameter.Modifier.PARAMS)
191 Type t = ParameterType (pos);
193 return tmp + TypeManager.CSharpName (t);
196 public Parameter.Modifier ParameterModifier (int pos)
198 Parameter.Modifier mod = GetParameter (pos).ModFlags;
200 if ((mod & (Parameter.Modifier.REF | Parameter.Modifier.OUT)) != 0)
201 mod |= Parameter.Modifier.ISBYREF;
208 class PtrHashtable : Hashtable {
209 sealed class PtrComparer : IComparer {
210 private PtrComparer () {}
212 public static PtrComparer Instance = new PtrComparer ();
214 public int Compare (object x, object y)
223 public PtrHashtable ()
225 comparer = PtrComparer.Instance;
230 // Compares member infos based on their name and
231 // also allows one argument to be a string
233 class MemberInfoCompare : IComparer {
235 public int Compare (object a, object b)
237 if (a == null || b == null){
238 Console.WriteLine ("Invalid information passed");
239 throw new Exception ();
243 return String.Compare ((string) a, ((MemberInfo)b).Name, false, CultureInfo.InvariantCulture);
246 return String.Compare (((MemberInfo)a).Name, (string) b, false, CultureInfo.InvariantCulture);
248 return String.Compare (((MemberInfo)a).Name, ((MemberInfo)b).Name, false, CultureInfo.InvariantCulture);
254 public object Second;
256 public Pair (object f, object s)
264 /// This is a wrapper around StreamReader which is seekable.
266 public class SeekableStreamReader
268 public SeekableStreamReader (StreamReader reader)
270 this.reader = reader;
271 this.buffer = new char [DefaultCacheSize];
274 public SeekableStreamReader (Stream stream, Encoding encoding, bool detect_encoding_from_bytemarks)
275 : this (new StreamReader (stream, encoding, detect_encoding_from_bytemarks))
280 private const int DefaultCacheSize = 1024;
288 /// The difference to the StreamReader's BaseStream.Position is that this one is reliable; ie. it
289 // always reports the correct position and if it's modified, it also takes care of the buffered data.
291 public int Position {
293 return buffer_start + pos;
297 // This one is easy: we're modifying the position within our current
299 if ((value >= buffer_start) && (value < buffer_start + buffer_size)) {
300 pos = value - buffer_start;
304 // Ok, now we need to seek.
305 reader.DiscardBufferedData ();
306 reader.BaseStream.Position = buffer_start = value;
307 buffer_size = pos = 0;
311 private bool ReadBuffer ()
314 buffer_start += buffer_size;
315 buffer_size = reader.Read (buffer, 0, buffer.Length);
316 return buffer_size > 0;
321 if ((pos >= buffer_size) && !ReadBuffer ())
329 if ((pos >= buffer_size) && !ReadBuffer ())
332 return buffer [pos++];
336 public class DoubleHash {
337 Hashtable l = new Hashtable ();
338 const int DEFAULT_INITIAL_BUCKETS = 100;
340 public DoubleHash () : this (DEFAULT_INITIAL_BUCKETS) {}
342 public DoubleHash (int size)
345 buckets = new Entry [size];
359 public Entry (object key1, object key2, int hash, object value, Entry next)
369 public bool Lookup (object a, object b, out object res)
371 int h = (a.GetHashCode () ^ b.GetHashCode ()) & 0x7FFFFFFF;
373 for (Entry e = buckets [h % count]; e != null; e = e.next) {
374 if (e.hash == h && e.key1.Equals (a) && e.key2.Equals (b)) {
383 public void Insert (object a, object b, object value)
385 // Is it an existing one?
387 int h = (a.GetHashCode () ^ b.GetHashCode ()) & 0x7FFFFFFF;
389 for (Entry e = buckets [h % count]; e != null; e = e.next) {
390 if (e.hash == h && e.key1.Equals (a) && e.key2.Equals (b))
394 int bucket = h % count;
395 buckets [bucket] = new Entry (a, b, h, value, buckets [bucket]);
397 // Grow whenever we double in size
398 if (size++ == count) {
402 Entry [] newBuckets = new Entry [count];
403 foreach (Entry root in buckets) {
406 int newLoc = e.hash % count;
408 e.next = newBuckets [newLoc];
409 newBuckets [newLoc] = e;
414 buckets = newBuckets;