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148 lines
5.6 KiB
C
148 lines
5.6 KiB
C
/*****************************************************************************/
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/* */
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/* expr.h */
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/* */
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/* Expression evaluation for the ca65 macroassembler */
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/* */
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/* */
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/* */
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/* (C) 1998-2003 Ullrich von Bassewitz */
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/* Römerstraße 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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/*****************************************************************************/
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/* Forwards */
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/*****************************************************************************/
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struct ExprDesc;
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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ExprNode* Expression (void);
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/* Evaluate an expression, build the expression tree on the heap and return
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* a pointer to the root of the tree.
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*/
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long ConstExpression (void);
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/* Parse an expression. Check if the expression is const, and print an error
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* message if not. Return the value of the expression, or a dummy, if it is
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* not constant.
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*/
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void FreeExpr (ExprNode* Root);
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/* Free the expression tree, Root is pointing to. */
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ExprNode* SimplifyExpr (ExprNode* Expr, const struct ExprDesc* D);
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/* Try to simplify the given expression tree */
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ExprNode* GenLiteralExpr (long Val);
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/* Return an expression tree that encodes the given literal value */
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ExprNode* GenLiteral0 (void);
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/* Return an expression tree that encodes the the number zero */
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ExprNode* GenSymExpr (struct SymEntry* Sym);
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/* Return an expression node that encodes the given symbol */
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ExprNode* GenAddExpr (ExprNode* Left, ExprNode* Right);
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/* Generate an addition from the two operands */
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ExprNode* GenCurrentPC (void);
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/* Return the current program counter as expression */
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ExprNode* GenSwapExpr (ExprNode* Expr);
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/* Return an extended expression with lo and hi bytes swapped */
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ExprNode* GenBranchExpr (unsigned Offs);
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/* Return an expression that encodes the difference between current PC plus
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* offset and the target expression (that is, Expression() - (*+Offs) ).
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*/
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ExprNode* GenULabelExpr (unsigned Num);
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/* Return an expression for an unnamed label with the given index */
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ExprNode* GenByteExpr (ExprNode* Expr);
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/* Force the given expression into a byte and return the result */
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ExprNode* GenWordExpr (ExprNode* Expr);
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/* Force the given expression into a word and return the result. */
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ExprNode* GenNE (ExprNode* Expr, long Val);
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/* Generate an expression that compares Expr and Val for inequality */
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int IsConstExpr (ExprNode* Expr, long* Val);
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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. If Val is not NULL and the
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* expression is constant, the constant value is stored here.
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*/
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int IsByteExpr (ExprNode* Root);
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/* Return true if this is a byte expression */
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int IsByteRange (long Val);
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/* Return true if this is a byte value */
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int IsWordRange (long Val);
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/* Return true if this is a word value */
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int IsFarRange (long Val);
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/* Return true if this is a far (24 bit) value */
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ExprNode* CloneExpr (ExprNode* Expr);
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/* Clone the given expression tree. The function will simply clone symbol
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* nodes, it will not resolve them.
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*/
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void WriteExpr (ExprNode* Expr);
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/* Write the given expression to the object file */
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/* End of expr.h */
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#endif
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