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src/ca65/expr.h

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+/*****************************************************************************/
+/*                                                                           */
+/*				    expr.h				     */
+/*                                                                           */
+/*	       Expression evaluation for the ca65 macroassembler	     */
+/*                                                                           */
+/*                                                                           */
+/*                                                                           */
+/* (C) 1998     Ullrich von Bassewitz                                        */
+/*              Wacholderweg 14                                              */
+/*              D-70597 Stuttgart                                            */
+/* EMail:       uz@musoftware.de                                             */
+/*                                                                           */
+/*                                                                           */
+/* This software is provided 'as-is', without any expressed or implied       */
+/* warranty.  In no event will the authors be held liable for any damages    */
+/* arising from the use of this software.                                    */
+/*                                                                           */
+/* Permission is granted to anyone to use this software for any purpose,     */
+/* including commercial applications, and to alter it and redistribute it    */
+/* freely, subject to the following restrictions:                            */
+/*                                                                           */
+/* 1. The origin of this software must not be misrepresented; you must not   */
+/*    claim that you wrote the original software. If you use this software   */
+/*    in a product, an acknowledgment in the product documentation would be  */
+/*    appreciated but is not required.                                       */
+/* 2. Altered source versions must be plainly marked as such, and must not   */
+/*    be misrepresented as being the original software.                      */
+/* 3. This notice may not be removed or altered from any source              */
+/*    distribution.                                                          */
+/*                                                                           */
+/*****************************************************************************/
+
+
+
+#ifndef EXPR_H
+#define EXPR_H
+
+
+
+#include "../common/exprdefs.h"
+
+
+
+/*****************************************************************************/
+/*     	      	     		     Code		     		     */
+/*****************************************************************************/
+
+
+
+ExprNode* Expression (void);
+/* Evaluate an expression, build the expression tree on the heap and return
+ * a pointer to the root of the tree.
+ */
+
+long ConstExpression (void);
+/* Parse an expression. Check if the expression is const, and print an error
+ * message if not. Return the value of the expression, or a dummy, if it is
+ * not constant.
+ */
+
+void FreeExpr (ExprNode* Root);
+/* Free the expression tree, Root is pointing to. */
+
+ExprNode* LiteralExpr (long Val);
+/* Return an expression tree that encodes the given literal value */
+
+ExprNode* CurrentPC (void);
+/* Return the current program counter as expression */
+
+ExprNode* SwapExpr (ExprNode* Expr);
+/* Return an extended expression with lo and hi bytes swapped */
+
+ExprNode* BranchExpr (unsigned Offs);
+/* Return an expression that encodes the difference between current PC plus
+ * offset and the target expression (that is, Expression() - (*+Offs) ).
+ */
+
+ExprNode* ULabelExpr (unsigned Num);
+/* Return an expression for an unnamed label with the given index */
+
+ExprNode* ForceWordExpr (ExprNode* Expr);
+/* Force the given expression into a word and return the result. */
+
+int IsConstExpr (ExprNode* Root);
+/* Return true if the given expression is a constant expression, that is, one
+ * with no references to external symbols.
+ */
+
+int IsByteExpr (ExprNode* Root);
+/* Return true if this is a byte expression */
+
+long GetExprVal (ExprNode* Expr);
+/* Get the value of a constant expression */
+
+int IsByteRange (long Val);
+/* Return true if this is a byte value */
+
+int IsWordRange (long Val);
+/* Return true if this is a word value */
+
+void DumpExpr (ExprNode* Expr);
+/* Dump an expression tree to stdout */
+
+ExprNode* FinalizeExpr (ExprNode* Expr);
+/* Resolve any symbols by cloning the symbol expression tree instead of the
+ * symbol reference, then try to simplify the expression as much as possible.
+ * This function must only be called if all symbols are resolved (no undefined
+ * symbol errors).
+ */
+
+ExprNode* CloneExpr (ExprNode* Expr);
+/* Clone the given expression tree. The function will simply clone symbol
+ * nodes, it will not resolve them.
+ */
+
+void WriteExpr (ExprNode* Expr);
+/* Write the given expression to the object file */
+
+
+
+/* End of expr.h */
+
+#endif
+
+
+