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/******************************************************************************
*
* Copyright (C) 1997-2021 by Dimitri van Heesch.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation under the terms of the GNU General Public License is hereby
* granted. No representations are made about the suitability of this software
* for any purpose. It is provided "as is" without express or implied warranty.
* See the GNU General Public License for more details.
*
* Documents produced by Doxygen are derivative works derived from the
* input used in their production; they are not affected by this license.
*
*/
%{
#include "cppvalue.h"
#include "constexp_p.h"
#include "message.h"
#include <stdio.h>
#include <stdlib.h>
int constexpYYerror(yyscan_t yyscanner, const char *s)
{
struct constexpYY_state* yyextra = constexpYYget_extra(yyscanner);
warn(yyextra->constExpFileName.c_str(), yyextra->constExpLineNr,
"preprocessing issue while doing constant expression evaluation: %s: input='%s'",s,yyextra->inputString.c_str());
return 0;
}
%}
%name-prefix "constexpYY"
%define api.pure full
%lex-param {yyscan_t yyscanner}
%parse-param {yyscan_t yyscanner}
%token TOK_QUESTIONMARK
%token TOK_COLON
%token TOK_OR
%token TOK_AND
%token TOK_BITWISEOR
%token TOK_BITWISEXOR
%token TOK_AMPERSAND
%token TOK_NOTEQUAL
%token TOK_EQUAL
%token TOK_LESSTHAN
%token TOK_GREATERTHAN
%token TOK_LESSTHANOREQUALTO
%token TOK_GREATERTHANOREQUALTO
%token TOK_SHIFTLEFT
%token TOK_SHIFTRIGHT
%token TOK_PLUS
%token TOK_MINUS
%token TOK_STAR
%token TOK_DIVIDE
%token TOK_MOD
%token TOK_TILDE
%token TOK_NOT
%token TOK_LPAREN
%token TOK_RPAREN
%token TOK_OCTALINT
%token TOK_DECIMALINT
%token TOK_HEXADECIMALINT
%token TOK_CHARACTER
%token TOK_FLOAT
%%
start: constant_expression
{
struct constexpYY_state* yyextra = constexpYYget_extra(yyscanner);
yyextra->resultValue = $1; return 0;
}
;
constant_expression: logical_or_expression
{ $$ = $1; }
| logical_or_expression
TOK_QUESTIONMARK logical_or_expression
TOK_COLON logical_or_expression
{
bool c = ($1.isInt() ? ((long)$1 != 0) : ((double)$1 != 0.0));
$$ = c ? $3 : $5;
}
;
logical_or_expression: logical_and_expression
{ $$ = $1; }
| logical_or_expression TOK_OR logical_and_expression
{
$$ = CPPValue( (long)((long)$1 || (long)$3) );
}
;
logical_and_expression: inclusive_or_expression
{ $$ = $1; }
| logical_and_expression TOK_AND inclusive_or_expression
{
$$ = CPPValue( (long)((long)$1 && (long)$3) );
}
;
inclusive_or_expression: exclusive_or_expression
{ $$ = $1; }
| inclusive_or_expression TOK_BITWISEOR
exclusive_or_expression
{
$$ = CPPValue( (long)$1 | (long)$3 );
}
;
exclusive_or_expression: and_expression
{ $$ = $1; }
| exclusive_or_expression TOK_BITWISEXOR and_expression
{
$$ = CPPValue( (long)$1 ^ (long)$3 );
}
;
and_expression: equality_expression
{ $$ = $1; }
| and_expression TOK_AMPERSAND equality_expression
{
$$ = CPPValue( (long)$1 & (long)$3 );
}
;
equality_expression: relational_expression
{ $$ = $1; }
| equality_expression TOK_EQUAL relational_expression
{
$$ = CPPValue( (long)((double)$1 == (double)$3) );
}
| equality_expression TOK_NOTEQUAL relational_expression
{
$$ = CPPValue( (long)((double)$1 != (double)$3) );
}
;
relational_expression: shift_expression
{ $$ = $1; }
| relational_expression TOK_LESSTHAN shift_expression
{
$$ = CPPValue( (long)((double)$1 < (double)$3) );
}
| relational_expression TOK_GREATERTHAN shift_expression
{
$$ = CPPValue( (long)((double)$1 > (double)$3) );
}
| relational_expression TOK_LESSTHANOREQUALTO
shift_expression
{
$$ = CPPValue( (long)((double)$1 <= (double)$3) );
}
| relational_expression TOK_GREATERTHANOREQUALTO
shift_expression
{
$$ = CPPValue( (long)((double)$1 >= (double)$3) );
}
;
shift_expression: additive_expression
{ $$ = $1; }
| shift_expression TOK_SHIFTLEFT additive_expression
{
$$ = CPPValue( (long)$1 << (long)$3 );
}
| shift_expression TOK_SHIFTRIGHT additive_expression
{
$$ = CPPValue( (long)$1 >> (long)$3 );
}
;
additive_expression: multiplicative_expression
{ $$ = $1; }
| additive_expression TOK_PLUS multiplicative_expression
{
if (!$1.isInt() || !$3.isInt())
{
$$ = CPPValue( (double)$1 + (double)$3 );
}
else
{
$$ = CPPValue( (long)$1 + (long)$3 );
}
}
| additive_expression TOK_MINUS multiplicative_expression
{
if (!$1.isInt() || !$3.isInt())
{
$$ = CPPValue( (double)$1 - (double)$3 );
}
else
{
$$ = CPPValue( (long)$1 - (long)$3 );
}
}
;
multiplicative_expression: unary_expression
{ $$ = $1; }
| multiplicative_expression TOK_STAR unary_expression
{
if (!$1.isInt() || !$3.isInt())
{
$$ = CPPValue( (double)$1 * (double)$3 );
}
else
{
$$ = CPPValue( (long)$1 * (long)$3 );
}
}
| multiplicative_expression TOK_DIVIDE unary_expression
{
if (!$1.isInt() || !$3.isInt())
{
$$ = CPPValue( (double)$1 / (double)$3 );
}
else
{
long value = $3;
if (value==0) value=1;
$$ = CPPValue( (long)$1 / value );
}
}
| multiplicative_expression TOK_MOD unary_expression
{
long value = $3;
if (value==0) value=1;
$$ = CPPValue( (long)$1 % value );
}
;
unary_expression: primary_expression
{ $$ = $1; }
| TOK_PLUS unary_expression
{ $$ = $1; }
| TOK_MINUS unary_expression
{
if ($2.isInt())
$$ = CPPValue(-(long)$2);
else
$$ = CPPValue(-(double)$2);
}
| TOK_TILDE unary_expression
{
$$ = CPPValue(~(long)$2);
}
| TOK_NOT unary_expression
{
$$ = CPPValue((long)!(long)$2);
}
;
primary_expression: constant
{ $$ = $1; }
| TOK_LPAREN constant_expression TOK_RPAREN
{ $$ = $2; }
;
constant: TOK_OCTALINT
{
struct constexpYY_state* yyextra = constexpYYget_extra(yyscanner);
$$ = parseOctal(yyextra->strToken);
}
| TOK_DECIMALINT
{
struct constexpYY_state* yyextra = constexpYYget_extra(yyscanner);
$$ = parseDecimal(yyextra->strToken);
}
| TOK_HEXADECIMALINT
{
struct constexpYY_state* yyextra = constexpYYget_extra(yyscanner);
$$ = parseHexadecimal(yyextra->strToken);
}
| TOK_CHARACTER
{
struct constexpYY_state* yyextra = constexpYYget_extra(yyscanner);
$$ = parseCharacter(yyextra->strToken);
}
| TOK_FLOAT
{
struct constexpYY_state* yyextra = constexpYYget_extra(yyscanner);
$$ = parseFloat(yyextra->strToken);
}
;
%%
|
