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read when the -t or -C switch is encountered and parts of it are processed. The remaining parts are processed when all object files and libraries have been read. To make this work, the expression evaluation in cfgexpr has been rewritten to generate true expression trees. This means that expressions in the linker config may use exports from the object files. Separation of config file processing is the base for several enhancements, for example forced imports by linker config. This code needs more work and is only very, very, very roughly tested. git-svn-id: svn://svn.cc65.org/cc65/trunk@4840 b7a2c559-68d2-44c3-8de9-860c34a00d81
106 lines
4.2 KiB
C
106 lines
4.2 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) 1998-2000 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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/* EMail: uz@musoftware.de */
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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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/* 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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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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