89 lines
3.9 KiB
C
89 lines
3.9 KiB
C
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/*****************************************************************************/
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/* */
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/* studyexpr.h */
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/* */
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/* Study an expression tree */
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/* */
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/* */
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/* */
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/* (C) 2003 Ullrich von Bassewitz */
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/* R<>merstra<72>e 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 STUDYEXPR_H
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#define STUDYEXPR_H
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/* common */
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#include "exprdefs.h"
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Structure for parsing expression trees */
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typedef struct ExprDesc ExprDesc;
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struct ExprDesc {
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long Val; /* The offset value */
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long Left; /* Left value for StudyBinaryExpr */
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int TooComplex; /* Expression is too complex to evaluate */
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long SymCount; /* Symbol reference count */
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long SecCount; /* Section reference count */
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struct SymEntry* SymRef; /* Symbol reference if any */
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unsigned SecRef; /* Section reference if any */
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};
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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ExprDesc* InitExprDesc (ExprDesc* ED);
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/* Initialize an ExprDesc structure for use with StudyExpr */
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int ExprDescIsConst (const ExprDesc* ED);
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/* Return true if the expression is constant */
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void StudyExpr (ExprNode* Expr, ExprDesc* D, int Sign);
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/* Study an expression tree and place the contents into D */
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/* End of studyexpr.h */
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#endif
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