90 lines
3.1 KiB
C++
90 lines
3.1 KiB
C++
/*
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* File: ast.h
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* Purpose: definition of the abstract syntax tree ADT.
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* Date: September 1993
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* (C) Cristina Cifuentes
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*/
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#pragma once
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static const int operandSize=20;
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#include <cstring>
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#include "Enums.h"
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#include "icode.h"
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/* The following definitions and types define the Conditional Expression
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* attributed syntax tree, as defined by the following EBNF:
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CondExp ::= CondTerm AND CondTerm | CondTerm
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CondTerm ::= (CondFactor op CondFactor)
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CondFactor ::= Identifier | ! CondFactor
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Identifier ::= globalVar | register | localVar | parameter | constant
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op ::= <= | < | = | != | > | >=
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*/
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/* High-level BOOLEAN conditions for iJB..iJNS icodes */
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static const condOp condOpJCond[12] = {LESS, LESS_EQUAL, GREATER_EQUAL, GREATER,
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EQUAL, NOT_EQUAL, LESS, GREATER_EQUAL,
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LESS_EQUAL, GREATER, GREATER_EQUAL, LESS};
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struct Function;
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struct STKFRAME;
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struct LOCAL_ID;
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struct ICODE;
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struct ID;
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#include "IdentType.h"
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//enum opLoc;
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//enum hlFirst;
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//enum operDu;
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/* Expression data type */
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struct COND_EXPR
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{
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condNodeType type; /* Conditional Expression Node Type */
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union _exprNode { /* Different cond expr nodes */
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struct /* for BOOLEAN_OP */
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{
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condOp op;
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COND_EXPR *lhs;
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COND_EXPR *rhs;
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} boolExpr;
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COND_EXPR *unaryExp; /* for NEGATION,ADDRESSOF,DEREFERENCE*/
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IDENTTYPE ident; /* for IDENTIFIER */
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} expr;
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public:
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static COND_EXPR *idGlob(int16 segValue, int16 off);
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static COND_EXPR *idRegIdx(Int idx, regType reg_type);
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static COND_EXPR *idKte(dword kte, byte size);
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static COND_EXPR *idLoc(Int off, LOCAL_ID *localId);
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static COND_EXPR *idReg(byte regi, flags32 icodeFlg, LOCAL_ID *locsym);
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static COND_EXPR *idLongIdx(Int idx);
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static COND_EXPR *idOther(byte seg, byte regi, int16 off);
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static COND_EXPR *idParam(Int off, const STKFRAME *argSymtab);
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static COND_EXPR *unary(condNodeType t, COND_EXPR *sub_expr);
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static COND_EXPR *idLong(LOCAL_ID *localId, opLoc sd, iICODE pIcode, hlFirst f, iICODE ix, operDu du, Int off);
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static COND_EXPR *idFunc(Function *pproc, STKFRAME *args);
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static COND_EXPR *idID(const ID *retVal, LOCAL_ID *locsym, iICODE ix_);
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static COND_EXPR *id(const ICODE &pIcode, opLoc sd, Function *pProc, iICODE ix_, ICODE &duIcode, operDu du);
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static COND_EXPR *boolOp(COND_EXPR *lhs, COND_EXPR *rhs, condOp op);
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public:
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COND_EXPR *clone();
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void release();
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void changeBoolOp(condOp newOp);
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COND_EXPR(COND_EXPR &other)
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{
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type=other.type;
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expr=other.expr;
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}
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COND_EXPR(condNodeType t=UNKNOWN_OP) : type(t)
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{
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memset(&expr,0,sizeof(_exprNode));
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}
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public:
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COND_EXPR *inverse(); // return new COND_EXPR that is invarse of this
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};
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/* Sequence of conditional expression data type */
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/*** NOTE: not used at present ****/
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//struct SEQ_COND_EXPR
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//{
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// COND_EXPR *expr;
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// struct _condExpSeq *neccxt;
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//};
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