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 /*****************************************************************************/
51 /*****************************************************************************/
53 /*****************************************************************************/
57 void FreeExpr (ExprNode* Root);
58 /* Free the expression tree, Root is pointing to. */
60 int IsConstExpr (ExprNode* Root);
61 /* Return true if the given expression is a constant expression, that is, one
62 * with no references to external symbols.
65 Import* GetExprImport (ExprNode* Expr);
66 /* Get the import data structure for a symbol expression node */
68 Export* GetExprExport (ExprNode* Expr);
69 /* Get the exported symbol for a symbol expression node */
71 Section* GetExprSection (ExprNode* Expr);
72 /* Get the segment for a section expression node */
74 long GetExprVal (ExprNode* Expr);
75 /* Get the value of a constant expression */
77 ExprNode* LiteralExpr (long Val, ObjData* O);
78 /* Return an expression tree that encodes the given literal value */
80 ExprNode* MemoryExpr (Memory* Mem, long Offs, ObjData* O);
81 /* Return an expression tree that encodes an offset into the memory area */
83 ExprNode* SegmentExpr (Segment* Seg, long Offs, ObjData* O);
84 /* Return an expression tree that encodes an offset into a segment */
86 ExprNode* SectionExpr (Section* Sec, long Offs, ObjData* O);
87 /* Return an expression tree that encodes an offset into a section */
89 ExprNode* ReadExpr (FILE* F, ObjData* O);
90 /* Read an expression from the given file */
92 int EqualExpr (ExprNode* E1, ExprNode* E2);
93 /* Check if two expressions are identical. */