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 OpcodeConst : Opcode {
29
30	TValue val;
31
32	internal OpcodeConst(TValue val)
33	{
34		this.val = val;
35	}
36
37	internal override void Run(CPU cpu)
38	{
39		cpu.Push(val);
40	}
41
42	internal override Word GetReference(T0Comp ctx)
43	{
44		TPointerXT xt = val.ptr as TPointerXT;
45		if (xt == null) {
46			return null;
47		}
48		xt.Resolve(ctx);
49		return xt.Target;
50	}
51
52	internal override ConstData GetDataBlock(T0Comp ctx)
53	{
54		TPointerBlob bp = val.ptr as TPointerBlob;
55		return bp == null ? null : bp.Blob;
56	}
57
58	internal override CodeElement ToCodeElement()
59	{
60		if (val.ptr == null) {
61			return new CodeElementUIntInt(1, val.Int);
62		}
63		TPointerXT xt = val.ptr as TPointerXT;
64		if (xt != null) {
65			if (val.x != 0) {
66				throw new Exception(
67					"Cannot compile XT: non-zero offset");
68			}
69			return new CodeElementUIntInt(1, xt.Target.Slot);
70		}
71		TPointerBlob bp = val.ptr as TPointerBlob;
72		if (bp != null) {
73			return new CodeElementUIntInt(1,
74				val.x + bp.Blob.Address);
75		}
76		TPointerExpr cx = val.ptr as TPointerExpr;
77		if (cx != null) {
78			return new CodeElementUIntExpr(1, cx, val.x);
79		}
80		throw new Exception(String.Format(
81			"Cannot embed constant (type = {0})",
82			val.ptr.GetType().FullName));
83	}
84
85	internal override int StackAction {
86		get {
87			return 1;
88		}
89	}
90
91	public override string ToString()
92	{
93		return "const " + val.ToString();
94	}
95}
96