mirror of https://github.com/cc65/cc65.git
125 lines
5.1 KiB
C
125 lines
5.1 KiB
C
/*****************************************************************************/
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/* */
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/* expr.h */
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/* */
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/* Expression evaluation for the ld65 linker */
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/* */
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/* */
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/* */
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/* (C) 1998-2011, Ullrich von Bassewitz */
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/* Roemerstrasse 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#ifndef EXPR_H
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#define EXPR_H
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/* common */
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#include "exprdefs.h"
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/* ld65 */
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#include "objdata.h"
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#include "exports.h"
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#include "config.h"
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Structure for parsing segment based expression trees */
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typedef struct SegExprDesc SegExprDesc;
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struct SegExprDesc {
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long Val; /* The offset value */
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int TooComplex; /* Expression too complex */
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Segment* Seg; /* Segment reference if any */
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};
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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ExprNode* NewExprNode (ObjData* O, unsigned char Op);
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/* Create a new expression node */
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void FreeExpr (ExprNode* Root);
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/* Free the expression tree, Root is pointing to. */
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int IsConstExpr (ExprNode* Root);
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/* Return true if the given expression is a constant expression, that is, one
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** with no references to external symbols.
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*/
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Import* GetExprImport (ExprNode* Expr);
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/* Get the import data structure for a symbol expression node */
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Export* GetExprExport (ExprNode* Expr);
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/* Get the exported symbol for a symbol expression node */
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Section* GetExprSection (ExprNode* Expr);
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/* Get the segment for a section expression node */
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long GetExprVal (ExprNode* Expr);
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/* Get the value of a constant expression */
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void GetSegExprVal (ExprNode* Expr, SegExprDesc* D);
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/* Check if the given expression consists of a segment reference and only
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** constant values, additions and subtractions. If anything else is found,
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** set D->TooComplex to true. The function will initialize D.
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*/
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ExprNode* LiteralExpr (long Val, ObjData* O);
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/* Return an expression tree that encodes the given literal value */
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ExprNode* MemoryExpr (MemoryArea* Mem, long Offs, ObjData* O);
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/* Return an expression tree that encodes an offset into the memory area */
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ExprNode* SegmentExpr (Segment* Seg, long Offs, ObjData* O);
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/* Return an expression tree that encodes an offset into a segment */
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ExprNode* SectionExpr (Section* Sec, long Offs, ObjData* O);
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/* Return an expression tree that encodes an offset into a section */
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ExprNode* ReadExpr (FILE* F, ObjData* O);
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/* Read an expression from the given file */
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int EqualExpr (ExprNode* E1, ExprNode* E2);
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/* Check if two expressions are identical. */
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/* End of expr.h */
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#endif
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