1 /*****************************************************************************/
5 /* Expression evaluation for the ld65 linker */
9 /* (C) 1998-2000 Ullrich von Bassewitz */
11 /* D-70597 Stuttgart */
12 /* EMail: uz@musoftware.de */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
32 /*****************************************************************************/
41 #include "../common/exprdefs.h"
49 /*****************************************************************************/
51 /*****************************************************************************/
55 void FreeExpr (ExprNode* Root);
56 /* Free the expression tree, Root is pointing to. */
58 int IsConstExpr (ExprNode* Root);
59 /* Return true if the given expression is a constant expression, that is, one
60 * with no references to external symbols.
63 Import* GetExprImport (ExprNode* Expr);
64 /* Get the import data structure for a symbol expression node */
66 Export* GetExprExport (ExprNode* Expr);
67 /* Get the exported symbol for a symbol expression node */
69 Section* GetExprSection (ExprNode* Expr);
70 /* Get the segment for a segment expression node */
72 long GetExprVal (ExprNode* Expr);
73 /* Get the value of a constant expression */
75 ExprNode* LiteralExpr (long Val, ObjData* O);
76 /* Return an expression tree that encodes the given literal value */
78 ExprNode* MemExpr (Memory* Mem, long Offs, ObjData* O);
79 /* Return an expression tree that encodes an offset into the memory area */
81 void DumpExpr (const ExprNode* Expr);
82 /* Dump an expression tree to stdout */
84 ExprNode* ReadExpr (FILE* F, ObjData* O);
85 /* Read an expression from the given file */
87 int EqualExpr (ExprNode* E1, ExprNode* E2);
88 /* Check if two expressions are identical. */