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engines/glk/alan3/stack.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef GLK_ALAN3_STACK
+#define GLK_ALAN3_STACK
+
+/* Header file for stack handler in Alan interpreter */
+
+#include "glk/alan3/acode.h"
+
+namespace Glk {
+namespace Alan3 {
+
+struct StackStructure {
+	Aword *stack;           // Array that can take Awords
+	int stackSize;
+	int stackp;
+	int framePointer;
+};
+
+typedef StackStructure *Stack;
+
+/* FUNCTIONS: */
+
+/* NB: The stack uses Aptr size elements since we need to be able to store pointers to allocated memory */
+
+extern Stack createStack(int size);
+extern void deleteStack(Stack stack);
+extern void dumpStack(Stack theStack);
+extern Aptr pop(Stack stack);
+extern void push(Stack stack, Aptr item);
+extern Aptr top(Stack theStack);
+extern int stackDepth(Stack theStack);
+
+extern void newFrame(Stack theStack, Aint noOfLocals);
+extern void setLocal(Stack theStack, Aint blocksBelow, Aint variableNumber, Aptr value);
+extern Aptr getLocal(Stack theStack, Aint level, Aint variable);
+extern void endFrame(Stack theStack);
+
+} // End of namespace Alan3
+} // End of namespace Glk
+
+#endif