Initial import.

T0/WordData.cs

@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining 
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be 
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+using System;
+using System.Collections.Generic;
+
+class WordData : Word {
+
+	ConstData blob;
+	string baseBlobName;
+	int offset;
+	bool ongoingResolution;
+
+	internal WordData(T0Comp owner, string name,
+		ConstData blob, int offset)
+		: base(owner, name)
+	{
+		this.blob = blob;
+		this.offset = offset;
+		StackEffect = new SType(0, 1);
+	}
+
+	internal WordData(T0Comp owner, string name,
+		string baseBlobName, int offset)
+		: base(owner, name)
+	{
+		this.baseBlobName = baseBlobName;
+		this.offset = offset;
+		StackEffect = new SType(0, 1);
+	}
+
+	internal override void Resolve()
+	{
+		if (blob != null) {
+			return;
+		}
+		if (ongoingResolution) {
+			throw new Exception(String.Format(
+				"circular reference in blobs ({0})", Name));
+		}
+		ongoingResolution = true;
+		WordData wd = TC.Lookup(baseBlobName) as WordData;
+		if (wd == null) {
+			throw new Exception(String.Format(
+				"data word '{0}' based on non-data word '{1}'",
+				Name, baseBlobName));
+		}
+		wd.Resolve();
+		blob = wd.blob;
+		offset += wd.offset;
+		ongoingResolution = false;
+	}
+
+	internal override void Run(CPU cpu)
+	{
+		Resolve();
+		cpu.Push(new TValue(offset, new TPointerBlob(blob)));
+	}
+
+	internal override List<ConstData> GetDataBlocks()
+	{
+		Resolve();
+		List<ConstData> r = new List<ConstData>();
+		r.Add(blob);
+		return r;
+	}
+
+	internal override void GenerateCodeElements(List<CodeElement> dst)
+	{
+		Resolve();
+		dst.Add(new CodeElementUInt(0));
+		dst.Add(new CodeElementUIntInt(1, blob.Address + offset));
+		dst.Add(new CodeElementUInt(0));
+	}
+}