Remember where each symbol was defined and where it was referenced. Write this

[cc65] / src / ca65 / expr.h

diff --git a/src/ca65/expr.h b/src/ca65/expr.h
index b08dd39ed9a6805be06f9eedcae405d64226c8c7..694a3b1a63820633023d30859c95994cc515716d 100644 (file)
--- a/src/ca65/expr.h
+++ b/src/ca65/expr.h
@@ -6,10 +6,10 @@
 /*                                                                           */
 /*                                                                           */
 /*                                                                           */
-/* (C) 1998-2003 Ullrich von Bassewitz                                       */
-/*               Römerstrasse 52                                             */
-/*               D-70794 Filderstadt                                         */
-/* EMail:        uz@cc65.org                                                 */
+/* (C) 1998-2011, Ullrich von Bassewitz                                      */
+/*                Roemerstrasse 52                                           */
+/*                D-70794 Filderstadt                                        */
+/* EMail:         uz@cc65.org                                                */
 /*                                                                           */
 /*                                                                           */
 /* This software is provided 'as-is', without any expressed or implied       */
@@ -44,7 +44,17 @@
 
 
 /*****************************************************************************/
-/*                                          Code                                    */
+/*                                 Forwards                                  */
+/*****************************************************************************/
+
+
+
+struct ExprDesc;
+
+
+
+/*****************************************************************************/
+/*                                          Code                                    */
 /*****************************************************************************/
 
 
@@ -63,12 +73,21 @@ long ConstExpression (void);
 void FreeExpr (ExprNode* Root);
 /* Free the expression tree, Root is pointing to. */
 
+ExprNode* SimplifyExpr (ExprNode* Expr, const struct ExprDesc* D);
+/* Try to simplify the given expression tree */
+
 ExprNode* GenLiteralExpr (long Val);
 /* Return an expression tree that encodes the given literal value */
 
+ExprNode* GenLiteral0 (void);
+/* Return an expression tree that encodes the the number zero */
+
 ExprNode* GenSymExpr (struct SymEntry* Sym);
 /* Return an expression node that encodes the given symbol */
 
+ExprNode* GenAddExpr (ExprNode* Left, ExprNode* Right);
+/* Generate an addition from the two operands */
+
 ExprNode* GenCurrentPC (void);
 /* Return the current program counter as expression */
 
@@ -92,28 +111,28 @@ ExprNode* GenWordExpr (ExprNode* Expr);
 ExprNode* GenNE (ExprNode* Expr, long Val);
 /* Generate an expression that compares Expr and Val for inequality */
 
-int IsConstExpr (ExprNode* Root);
+int IsConstExpr (ExprNode* Expr, long* Val);
 /* Return true if the given expression is a constant expression, that is, one
- * with no references to external symbols.
+ * with no references to external symbols. If Val is not NULL and the
+ * expression is constant, the constant value is stored here.
  */
 
 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 */
 
-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).
+int IsFarRange (long Val);
+/* Return true if this is a far (24 bit) value */
+
+int IsEasyConst (const ExprNode* E, long* Val);
+/* Do some light checking if the given node is a constant. Don't care if E is
+ * a complex expression. If E is a constant, return true and place its value
+ * into Val, provided that Val is not NULL.
  */
 
 ExprNode* CloneExpr (ExprNode* Expr);
@@ -124,6 +143,23 @@ ExprNode* CloneExpr (ExprNode* Expr);
 void WriteExpr (ExprNode* Expr);
 /* Write the given expression to the object file */
 
+void ExprGuessedAddrSize (const ExprNode* Expr, unsigned char AddrSize);
+/* Mark the address size of the given expression tree as guessed. The address
+ * size passed as argument is the one NOT used, because the actual address
+ * size wasn't known. Example: Zero page addressing was not used because symbol
+ * is undefined, and absolute addressing was available.
+ * This function will actually parse the expression tree for undefined symbols,
+ * and mark these symbols accordingly.
+ */
+
+ExprNode* FuncBankByte (void);
+/* Handle the .BANKBYTE builtin function */
+
+ExprNode* FuncLoByte (void);
+/* Handle the .LOBYTE builtin function */
+
+ExprNode* FuncHiByte (void);
+/* Handle the .HIBYTE builtin function */
 
 
 /* End of expr.h */