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|
/***************************************************************
* pcfunc.c
* Standard Function operating on constant values
*
* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
***************************************************************/
/***************************************************************
* Included Files
***************************************************************/
#include <sys/types.h>
#include <stdint.h>
#include <stdio.h>
#include <math.h>
#include "keywords.h"
#include "pasdefs.h"
#include "ptdefs.h"
#include "podefs.h"
#include "pfdefs.h"
#include "pedefs.h"
#include "pxdefs.h"
#include "pas.h"
#include "pexpr.h"
#include "pfunc.h"
#include "ptkn.h"
#include "perr.h"
/***************************************************************
* Private Function Prototypes
***************************************************************/
/* Standard Pascal Functions */
static void constantAbsFunc(void); /* Integer absolute value */
static void constantPredFunc(void);
static void constantOrdFunc(void); /* Convert scalar to integer */
static void constantSqrFunc(void);
static void constantRealFunc(uint8_t fpCode);
static void constantSuccFunc(void);
static void constantOddFunc(void);
static void constantChrFunc(void);
static void constantReal2IntFunc(int kind);
static void isOrdinalConstant(void);
/***************************************************************/
/* Process a standard Pascal function call */
void builtInFunctionOfConstant(void)
{
TRACE(lstFile,"[builtInFunctionFactor]");
/* Is the token a function? */
if (token == tFUNC)
{
/* Yes, process it procedure according to the extended token type */
switch (tknSubType)
{
/* Functions which return the same type as their argument */
case txABS :
constantAbsFunc();
break;
case txSQR :
constantSqrFunc();
break;
case txPRED :
constantPredFunc();
break;
case txSUCC :
constantSuccFunc();
break;
/* Functions returning INTEGER with REAL arguments */
case txROUND :
constantReal2IntFunc(fpROUND);
break;
case txTRUNC :
constantReal2IntFunc(fpTRUNC);
break;
/* Functions returning CHARACTER with INTEGER arguments. */
case txCHR :
constantChrFunc();
break;
/* Function returning integer with scalar arguments */
case txORD :
constantOrdFunc();
break;
/* Functions returning BOOLEAN */
case txODD :
constantOddFunc();
break;
/* Functions returning REAL with REAL/INTEGER arguments */
case txSQRT :
constantRealFunc(fpSQRT);
break;
case txSIN :
constantRealFunc(fpSIN);
break;
case txCOS :
constantRealFunc(fpCOS);
break;
case txARCTAN :
constantRealFunc(fpATAN);
break;
case txLN :
constantRealFunc(fpLN);
break;
case txEXP :
constantRealFunc(fpEXP);
break;
case txGETENV : /* Non-standard C library interfaces */
case txEOLN :
case txEOF :
default :
error(eINVALIDPROC);
break;
}
}
}
/**********************************************************************/
static void constantAbsFunc(void)
{
TRACE(lstFile,"[constantAbsFunc]");
/* FORM: ABS (<simple integer/real expression>) */
checkLParen();
constantExpression();
if (constantToken == tINT_CONST)
{
if (constantInt < 0)
constantInt = -constantInt;
}
else if (constantToken == tREAL_CONST)
{
if (constantReal < 0)
constantReal = -constantInt;
}
else
error(eINVARG);
checkRParen();
}
/**********************************************************************/
static void constantOrdFunc(void)
{
TRACE(lstFile,"[constantOrdFunc]");
/* FORM: ORD (<scalar type>) */
checkLParen();
constantExpression();
isOrdinalConstant();
checkRParen();
}
/**********************************************************************/
static void constantPredFunc(void)
{
TRACE(lstFile,"[constantPredFunc]");
/* FORM: PRED (<simple integer expression>) */
checkLParen();
constantExpression();
isOrdinalConstant();
constantInt--;
checkRParen();
}
/**********************************************************************/
static void constantSqrFunc(void)
{
TRACE(lstFile,"[constantSqrFunc]");
/* FORM: SQR (<simple integer OR real expression>) */
checkLParen();
constantExpression();
if (constantToken == tINT_CONST)
{
constantInt *= constantInt;
}
else if (constantToken == tREAL_CONST)
{
constantReal *= constantReal;
}
else
{
error(eINVARG);
}
checkRParen();
}
/**********************************************************************/
static void constantRealFunc(uint8_t fpOpCode)
{
TRACE(lstFile,"[constantRealFunc]");
/* FORM: <function identifier> (<real/integer expression>) */
checkLParen();
constantExpression();
if (constantToken == tINT_CONST)
constantReal = (double)constantInt;
else
error(eINVARG);
checkRParen();
}
/**********************************************************************/
static void constantSuccFunc(void)
{
TRACE(lstFile,"[constantSuccFunc]");
/* FORM: SUCC (<simple integer expression>) */
checkLParen();
constantExpression();
isOrdinalConstant();
constantInt++;
checkRParen();
}
/***********************************************************************/
static void constantOddFunc(void)
{
TRACE(lstFile,"[constantOddFunc]");
/* FORM: ODD (<simple integer expression>) */
checkLParen();
constantExpression();
isOrdinalConstant();
constantInt &= 1;
expression(exprAnyOrdinal, NULL);
checkRParen();
}
/***********************************************************************/
/* Process the standard chr function */
static void constantChrFunc(void)
{
TRACE(lstFile,"[constantCharFunc]");
/* Form: chr(integer expression).
*
* char(val) is only defined if there exists a character ch such
* that ord(ch) = val. If this is not the case, we will simply
* let the returned value exceed the range of type char. */
checkLParen();
constantExpression();
if (constantToken == tINT_CONST)
{
constantToken = tCHAR_CONST;
}
else
{
error(eINVARG);
}
checkRParen();
}
/***********************************************************************/
static void constantReal2IntFunc(int kind)
{
error(eNOTYET);
}
/***********************************************************************/
static void isOrdinalConstant(void)
{
if ((constantToken == tINT_CONST) || /* integer value */
(constantToken == tCHAR_CONST) || /* character value */
(constantToken == tBOOLEAN_CONST))
return;
else
error(eINVARG);
}
/***********************************************************************/
|
