1/*
2 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24
25using System;
26using System.Collections.Generic;
27
28class WordData : Word {
29
30	ConstData blob;
31	string baseBlobName;
32	int offset;
33	bool ongoingResolution;
34
35	internal WordData(T0Comp owner, string name,
36		ConstData blob, int offset)
37		: base(owner, name)
38	{
39		this.blob = blob;
40		this.offset = offset;
41		StackEffect = new SType(0, 1);
42	}
43
44	internal WordData(T0Comp owner, string name,
45		string baseBlobName, int offset)
46		: base(owner, name)
47	{
48		this.baseBlobName = baseBlobName;
49		this.offset = offset;
50		StackEffect = new SType(0, 1);
51	}
52
53	internal override void Resolve()
54	{
55		if (blob != null) {
56			return;
57		}
58		if (ongoingResolution) {
59			throw new Exception(String.Format(
60				"circular reference in blobs ({0})", Name));
61		}
62		ongoingResolution = true;
63		WordData wd = TC.Lookup(baseBlobName) as WordData;
64		if (wd == null) {
65			throw new Exception(String.Format(
66				"data word '{0}' based on non-data word '{1}'",
67				Name, baseBlobName));
68		}
69		wd.Resolve();
70		blob = wd.blob;
71		offset += wd.offset;
72		ongoingResolution = false;
73	}
74
75	internal override void Run(CPU cpu)
76	{
77		Resolve();
78		cpu.Push(new TValue(offset, new TPointerBlob(blob)));
79	}
80
81	internal override List<ConstData> GetDataBlocks()
82	{
83		Resolve();
84		List<ConstData> r = new List<ConstData>();
85		r.Add(blob);
86		return r;
87	}
88
89	internal override void GenerateCodeElements(List<CodeElement> dst)
90	{
91		Resolve();
92		dst.Add(new CodeElementUInt(0));
93		dst.Add(new CodeElementUIntInt(1, blob.Address + offset));
94		dst.Add(new CodeElementUInt(0));
95	}
96}
97