home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
OS/2 Shareware BBS: 10 Tools
/
10-Tools.zip
/
fchk294s.zip
/
ftnchek-2.9.4
/
exprtype.c
< prev
next >
Wrap
C/C++ Source or Header
|
1996-05-26
|
45KB
|
1,605 lines
/* exprtype.c -- propagates datatype thru expressions.
Copyright (C) 1992 by Robert K. Moniot.
This program is free software. Permission is granted to
modify it and/or redistribute it, retaining this notice.
No guarantees accompany this software.
*/
/* I. */
/* exprtype.c:
Routines to propagate datatype through expressions.
binexpr_type() Yields result type of binary expression.
unexpr_type() Yields result type of unary expression.
assignment_stmt_type() Checks assignment statement type.
func_ref_expr(id,args,result) Forms token for a function invocation.
primary_id_expr() Forms token for primary which is an identifier.
stmt_fun_arg_cmp(t1,t2) Checks agreement between stmt func args.
int int_power(x,n) Computes x**n for value propagation.
init_typesizes(wdsize) Sets standard type sizes
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "ftnchek.h"
#define EXPRTYPE
#include "symtab.h"
#include "tokdefs.h"
PROTO(PRIVATE char* sized_typename,( int type, long size ));
PROTO(PRIVATE void report_mismatch,( Token *term1, Token *operator, Token *term2 ));
PROTO(PRIVATE void report_type,( Token *t ));
PROTO(PRIVATE int int_power,( int x, int n ));
PROTO(PRIVATE int eval_intrins,( IntrinsInfo *defn, Token *args ));
extern int in_assignment_stmt; /* shared with fortran.y */
#define max(x,y) ((y)>(x)?(y):(x))
/* shorthand for datatypes. must match those in symtab.h */
/* N.B. Also, the fact that type_DEFAULT=0 is assumed in size
propagation code. */
#define E 0 /* Error for invalid type combos */
#define I 1
#define R 2
#define D 3
#define C 4
#define Z 5
#define L 6
#define S 7
#define H 8
#define NumT (H+1) /* number of types in tables below */
#define W 10 /* Warning for nonstandard type combos: W>NumT */
/* for + - / * ** ANSI book pp. 6-5,6-6 */
/* Mixed double+complex = double complex with
warning, double + double complex is OK */
PRIVATE unsigned char arith_expr_type[NumT][NumT]={
/*E I R D C Z L S H */
{ E, E, E, E, E, E, E, E, E }, /* E */
{ E, I, R, D, C, Z, E, E, E }, /* I */
{ E, R, R, D, C, Z, E, E, E }, /* R */
{ E, D, D, D,W+Z, Z, E, E, E }, /* D */
{ E, C, C,W+Z, C, Z, E, E, E }, /* C */
{ E, Z, Z, Z, Z, Z, E, E, E }, /* Z */
{ E, E, E, E, E, E, E, E, E }, /* L */
{ E, E, E, E, E, E, E, E, E }, /* S */
{ E, E, E, E, E, E, E, E, E } /* H */
};
/* for relops. Corresponds to arith type table
except that nonstandard comparisons of like
types have warning, not error. */
PRIVATE unsigned char rel_expr_type[NumT][NumT]={
/*E I R D C Z L S H */
{ E, E, E, E, E, E, E, E, E }, /* E */
{ E, L, L, L, L, L, E, E,W+L }, /* I */
{ E, L, L, L, L, L, E, E, E }, /* R */
{ E, L, L, L,W+L, L, E, E, E }, /* D */
{ E, L, L,W+L, L, L, E, E, E }, /* C */
{ E, L, L, L, L, L, E, E, E }, /* Z */
{ E, E, E, E, E, E,W+L, E,W+L }, /* L */
{ E, E, E, E, E, E, E, L, E }, /* S */
{ E,W+L, E, E, E, E,W+L, E,W+L } /* H */
};
/* Result of assignment: lvalue = expr. Here rows
correspond to type of lvalue, columns to type
of expr */
PRIVATE unsigned char assignment_type[NumT][NumT]={
/*E I R D C Z L S H */
{ E, E, E, E, E, E, E, E, E }, /* E */
{ E, I, I, I, I, I, E, E,W+I }, /* I */
{ E, R, R, R, R, R, E, E,W+R }, /* R */
{ E, D, D, D, D, D, E, E,W+D }, /* D */
{ E, C, C, C, C, C, E, E,W+C }, /* C */
{ E, Z, Z, Z, Z, Z, E, E,W+Z }, /* Z */
{ E, E, E, E, E, E, L, E,W+L }, /* L */
{ E, E, E, E, E, E, E, S, E }, /* S */
{ E, E, E, E, E, E, E, E, E } /* H not possible for lvalue */
};
#define INTRINS_ARGS (op == ',') /* Flag to modify behavior of binexpr_type */
/* Routine used in printing diagnostics: returns string "type" for
unsized objects, "type*size" for explicitly sized things. Due
to use of local static variable, cannot be invoked twice in the
same expression. */
PRIVATE char*
#if HAVE_STDC
sized_typename(int type, long int size)
#else /* K&R style */
sized_typename(type,size)
int type; long size;
#endif /* HAVE_STDC */
{
static char strbuf[]="type*000000"; /* template */
static char *char_unk="char*(?)";
static char *char_adj="char*(*)";
if(size == size_DEFAULT) {
return type_name[type]; /* no explicit size */
}
else {
if(type != S || size > 0) {
(void)sprintf(strbuf,"%4s*%ld", /* type*size */
type_name[type],
size%1000000);
}
else { /* handle special character size codes */
if(size == size_ADJUSTABLE)
return char_adj;
else /*size_UNKNOWN*/
return char_unk;
}
}
return strbuf;
}
void
init_typesizes(VOID)
/* Only executes once. Thus cannot change wordsize
after processing starts. */
{
static int trapdoor=FALSE;
if(trapdoor) {
if(given_wordsize != local_wordsize) {
(void)fprintf(stderr,
"\nSorry-Cannot change wordsize after processing starts");
}
given_wordsize = local_wordsize;
}
else {
trapdoor = TRUE;
local_wordsize = given_wordsize;
if(given_wordsize != 0) {
if(given_wordsize != BpW) {
type_size[I] = type_size[R] = type_size[L] = (BYTE)given_wordsize;
type_size[D] = type_size[C] = (BYTE)(2*given_wordsize);
type_size[Z] = (BYTE)(4*given_wordsize);
}
}
}
}
/* this routine propagates type in binary expressions */
void
#if HAVE_STDC
binexpr_type(Token *term1, Token *operator, Token *term2, Token *result)
#else /* K&R style */
binexpr_type(term1,operator,term2,result)
Token *term1, *operator, *term2, *result;
#endif /* HAVE_STDC */
{
int op = operator->class,
type1 = datatype_of(term1->TOK_type),
type2 = datatype_of(term2->TOK_type),
result_type;
long
size1 = term1->size,
size2 = term2->size,
result_size;
if( ! is_computational_type(type1) ) {
syntax_error(term1->line_num,term1->col_num,
"noncomputational primary in expression:");
report_type(term1);
result_type = E;
}
else if( ! is_computational_type(type2) ) {
syntax_error(term2->line_num,term2->col_num,
"noncomputational primary in expression:");
report_type(term2);
result_type = E;
}
else {
switch(op) {
/* arithmetic operators: use lookup table */
case '+':
case '-':
case '*':
case '/':
case tok_power:
result_type = (unsigned)arith_expr_type[type1][type2];
break;
/* relational operators: use lookup table */
case tok_relop:
result_type = (unsigned)rel_expr_type[type1][type2];
break;
/* logical operators: operands should be
logical, but allow integers with a
warning. */
case tok_AND:
case tok_OR:
case tok_EQV:
case tok_NEQV:
if(type1 == L && type2 == L)
result_type = L;
else if(type1 == I && type2 == I)
result_type = W+I;
else
result_type = E;
break;
/* // operator: operands must be strings */
case tok_concat:
if(type1 == S && type2 == S)
result_type = S;
else
result_type = E;
break;
/* Intrinsic function argument list: no promotion
across type categories. Accept matching type
categories: size match will be checked later. */
case ',':
if( type_category[type1] != type_category[type2] )
result_type = E;
else if(type1 == S)
result_type = S;
else
result_type = (unsigned)arith_expr_type[type1][type2];
break;
default:
oops_message(OOPS_NONFATAL,
operator->line_num,operator->col_num,
"operator unknown: type not propagated");
result_type = type1;
break;
}
if( (type1 != E && type2 != E) ) {
if( result_type == E) {
syntax_error(operator->line_num,operator->col_num,
"type mismatch");
if(INTRINS_ARGS) {
msg_tail("between intrinsic function arguments:");
}
else {
msg_tail("in expression:");
}
report_mismatch(term1,operator,term2);
}
else if(result_type >= W) { /* W result */
if(f77_mixed_expr) {
warning(operator->line_num,operator->col_num,
"nonstandard type combination in expression:");
report_mismatch(term1,operator,term2);
}
result_type -= W;
}
/* Obscure standard rule */
else if( (f77_mixed_expr) &&
op == tok_concat && !in_assignment_stmt &&
(size1 == size_ADJUSTABLE || size2 == size_ADJUSTABLE) ) {
nonstandard(operator->line_num,operator->col_num);
msg_tail("adjustable size cannot be concatenated here");
}
}
}
/* Figure out the size of result */
result_size = size_DEFAULT;
if(result_type != E && /* Error type gets DEFAULT size */
op != tok_relop) { /* Result of compare gets DEFAULT size */
if(op == tok_concat) { /* string//string yields sum of lengths */
if(size1 == size_UNKNOWN || size2 == size_UNKNOWN)
result_size = size_UNKNOWN;
else
if(size1 == size_ADJUSTABLE || size2 == size_ADJUSTABLE)
result_size = size_ADJUSTABLE;
else {
result_size = size1 + size2;
if(port_long_string && result_size > 255)
nonportable(operator->line_num,operator->col_num,
"character expression length exceeds 255");
}
}
/* DEFAULT op DEFAULT always yields DEFAULT. So need
to handle only explicitly sized expressions,
except intrinsic arglists, where no promotion
of plain real to dble or plain complex to dcpx,
and check for promotions of real types.
*/
else if(INTRINS_ARGS?
(type1 != type2 ||
(type1 == type2 && is_numeric_type(type1) &&
(size1 != size_DEFAULT || size2 != size_DEFAULT))) :
((size1 != size_DEFAULT || size2 != size_DEFAULT) ||
(trunc_promotion &&
is_float_type(type1) && is_float_type(type2))))
{
/* Local variables for convenience.
N.B. Use tc1/2,ls1/2 for tests,
t1/2,s1/2 for assigning result.
*/
int t1,t2; /* sorted types: t1 <= t2. */
long s1,s2; /* sizes of t1 and t2. */
int tc1,tc2; /* type categories: D->R and Z->C */
long ls1,ls2; /* local sizes = declared size else type_size */
int defsize1,defsize2; /* flags for default size */
/* Sort so that t1 <= t2 */
if(type1 <= type2) {
t1 = type1; s1 = size1;
t2 = type2; s2 = size2;
}
else {
t1 = type2; s1 = size2;
t2 = type1; s2 = size1;
}
/* Assign type categories and local sizes */
tc1 = type_category[t1];
tc2 = type_category[t2];
defsize1 = (s1 == size_DEFAULT);
defsize2 = (s2 == size_DEFAULT);
ls1 = (defsize1? type_size[t1]: s1);
ls2 = (defsize2? type_size[t2]: s2);
#ifdef DEBUG_EXPRTYPE
if(debug_latest)
(void)fprintf(list_fd,"\nt1=%s s1=%d ls1=%d t2=%s s2=%d ls2=%d",
type_name[t1],s1,ls1, type_name[t2], s2, ls2);
#endif
if(tc1 == tc2) {/* same type category */
/* Intrins args: size promotion illegal */
if(INTRINS_ARGS && ls1 != ls2) {
syntax_error(operator->line_num,operator->col_num,
"precision mismatch in intrinsic argument list:");
report_mismatch(term1,operator,term2);
}
/* Give -port warning if e.g. plain I+I*2
(variables only) */
else if(port_mixed_size || local_wordsize==0) {
if(defsize1 != defsize2
&& !is_true(CONST_EXPR,term1->TOK_flags)
&& !is_true(CONST_EXPR,term2->TOK_flags))
{
nonportable(operator->line_num,operator->col_num,
INTRINS_ARGS?"intrinsic argument list":"expr");
msg_tail("mixes default and explicit");
msg_tail((is_numeric_type(t1)&&is_numeric_type(t2))?
"precision":"size");
msg_tail("operands:");
report_mismatch(term1,operator,term2);
}
}
/* If same type category, use the larger of the two sizes if
both declared. If only one size declared, use the
larger of the declared size and the default size.
If result is equal in size to default, use size_DEFAULT.
*/
if(ls1 > ls2) {
result_size = s1;
}
else if(ls2 > ls1) {
result_size = s2;
}
else /*ls1 == ls2*/{
if(!defsize1 && !defsize2)
result_size = s1; /* otherwise DEFAULT */
}
}/* end(tc1==tc2) */
else /* tc1!=tc2 */ {
/* Differing type categories: only two cases. */
/* Case 1: I + R|D|C|Z
Result: size of dominant type */
if(tc1 == I) {
result_size = s2;
}
/* Case 2: R|D + C|Z
Result: larger of C|Z and 2*size of R|D */
else {
if(ls2 >= 2*ls1)
result_size = s2;
else
result_size = 2*s1; /* 2*size_DEFAULT = 0 is still DEFAULT */
}
}/* end tc1 != tc2 */
/* change D or Z to default size or else
to explicitly sized R or C
*/
if(result_type == D || result_type == Z) {
if(result_size != size_DEFAULT
&& result_size != type_size[result_type])
result_type = (result_type==D)?R:C;
else
result_size = size_DEFAULT;
}
/* Give -trunc warning if a real or
complex type is promoted to double. */
if(trunc_promotion && !INTRINS_ARGS && is_float_type(t1) ) {
/* First clause checks R+R size agreement */
if( (type_category[result_type] == R && ls1 != ls2)
/* Second clause checks R+C and C+C */
|| (type_category[result_type] == C &&
(type_category[t1] == R? ls2 != 2*ls1 : ls2 != ls1)) ){
warning(operator->line_num,operator->col_num,
"promotion may not give desired precision:");
report_mismatch(term1,operator,term2);
}
}
}/*end if(non-DEFAULT sizes)*/
}/*end if(result_size != E)*/
#ifdef DEBUG_EXPRTYPE
if(debug_latest) {
(void)fprintf(list_fd,"\nsize of %s %c",sized_typename(type1,size1),
ispunct(op)?op:'~');
(void)fprintf(list_fd," %s = ",sized_typename(type2,size2));
(void)fprintf(list_fd,"%s",sized_typename(result_type,result_size));
}
#endif
result->TOK_type = type_byte(class_VAR, result_type);
result->TOK_flags = 0; /* clear all flags */
result->size = result_size;
/* Keep track of constant expressions */
if( is_true(CONST_EXPR,term1->TOK_flags)
&& is_true(CONST_EXPR,term2->TOK_flags)
&& !(op==tok_power && type2!=I) ) { /* exclude **REAL */
make_true(CONST_EXPR,result->TOK_flags);
}
/* Parameter expressions are like constant exprs
except we bend the rules to allow intrinsic functions
and **REAL */
if( is_true(PARAMETER_EXPR,term1->TOK_flags)
&& is_true(PARAMETER_EXPR,term2->TOK_flags) ) {
make_true(PARAMETER_EXPR,result->TOK_flags);
}
if( is_true(EVALUATED_EXPR,term1->TOK_flags)
&& is_true(EVALUATED_EXPR,term2->TOK_flags) ) {
make_true(EVALUATED_EXPR,result->TOK_flags);
}
#ifdef DEBUG_EXPRTYPE
if(debug_latest)
(void)fprintf(list_fd,"\nconst param eval: (%d %d %d) %s (%d %d %d) = (%d %d %d)",
is_true(CONST_EXPR,term1->TOK_flags),
is_true(PARAMETER_EXPR,term1->TOK_flags),
is_true(EVALUATED_EXPR,term1->TOK_flags),
operator->src_text,
is_true(CONST_EXPR,term2->TOK_flags),
is_true(PARAMETER_EXPR,term2->TOK_flags),
is_true(EVALUATED_EXPR,term2->TOK_flags),
is_true(CONST_EXPR,result->TOK_flags),
is_true(PARAMETER_EXPR,result->TOK_flags),
is_true(EVALUATED_EXPR,result->TOK_flags));
#endif
if(! INTRINS_ARGS) { /* Remaining steps only applicable to exprs */
/* Remember if integer division was used */
if(result_type == type_INTEGER &&
(op == '/' ||
(is_true(INT_QUOTIENT_EXPR,term1->TOK_flags) ||
is_true(INT_QUOTIENT_EXPR,term2->TOK_flags))) ) {
make_true(INT_QUOTIENT_EXPR,result->TOK_flags);
}
/* Issue warning if integer expr involving division is
later converted to any real type, or if it is used
as an exponent. */
if( is_true(INT_QUOTIENT_EXPR,term1->TOK_flags)
|| is_true(INT_QUOTIENT_EXPR,term2->TOK_flags) ) {
int r=result_type;
if(r == type_LOGICAL) /* relational tests are equivalent */
r = arith_expr_type[type1][type2]; /* to subtraction */
if(op == tok_power && is_true(INT_QUOTIENT_EXPR,term2->TOK_flags) ) {
if(trunc_int_div_exponent)
warning(operator->line_num,operator->col_num,
"integer quotient expr used in exponent");
if( ! is_true(INT_QUOTIENT_EXPR,term1->TOK_flags) )
make_false(INT_QUOTIENT_EXPR,result->TOK_flags);
}
else if( r == type_REAL || r == type_DP || r == type_COMPLEX) {
if(trunc_int_div_real)
warning(operator->line_num,operator->col_num,
"integer quotient expr converted to real");
}
}
/* If either term is an identifier, set use flag */
if(is_true(ID_EXPR,term1->TOK_flags))
use_variable(term1);
if(is_true(ID_EXPR,term2->TOK_flags))
use_variable(term2);
/* Propagate the value of integer constant expressions */
if(is_true(EVALUATED_EXPR,result->TOK_flags)) {
if(result_type == type_INTEGER) { /* Only ints propagated */
int a = int_expr_value(term1),
b = int_expr_value(term2),
c;
switch(op) {
case '+': c = a+b; break;
case '-': c = a-b; break;
case '*': c = a*b; break;
case '/': if(b == 0) {
syntax_error(term2->line_num,term2->col_num,
"division by zero attempted");
c = 0;
}
else {
c = a/b;
}
break;
case tok_power: c = int_power(a,b); break;
case tok_AND: c = a&b; break;
case tok_OR: c = a|b; break;
case tok_EQV: c = ~(a^b); break;
case tok_NEQV: c = a^b; break;
default:
oops_message(OOPS_NONFATAL,
operator->line_num,operator->col_num,
"invalid int expr operator");
c = 0; break;
}
make_true(EVALUATED_EXPR,result->TOK_flags);
result->value.integer = c; /* Result goes into token value */
/* Integer division (including i**neg)
that yields 0 is suspicious. */
if(trunc_int_div_zero)
if(c==0 && (op=='/' || op==tok_power)) {
warning(operator->line_num,operator->col_num,
"integer const expr yields result of 0");
}
}
}
/* Also nonconstant**neg is 0 unless
nonconstant=1 */
else if(trunc_int_neg_power)
if(result_type == type_INTEGER && op == tok_power
&& is_true(EVALUATED_EXPR,term2->TOK_flags)
&& int_expr_value(term2) < 0) {
warning(operator->line_num,operator->col_num,
"integer to negative power usually yields 0");
}
}/* end if !INTRINS_ARGS */
}/*binexpr_type*/
/* this routine propagates type in unary expressions */
void
#if HAVE_STDC
unexpr_type(Token *operator, Token *term1, Token *result)
#else /* K&R style */
unexpr_type(operator,term1,result)
Token *term1, *operator, *result;
#endif /* HAVE_STDC */
{
int op = operator->class,
type1 = datatype_of(term1->TOK_type),
result_type;
if( ! is_computational_type(type1) ) {
syntax_error(term1->line_num,term1->col_num,
"noncomputational primary in expression:");
report_type(term1);
result_type = E;
}
else {
switch(op) {
/* arith operators: use diagonal of lookup table */
case '+':
case '-':
result_type = arith_expr_type[type1][type1];
break;
/* NOT: operand should be
logical, but allow integers with a
warning. */
case tok_NOT:
if(type1 == L)
result_type = L;
else if(type1 == I)
result_type = W+I;
else
result_type = E;
break;
default:
oops_message(OOPS_NONFATAL,
operator->line_num,operator->col_num,
"unary operator type not propagated");
result_type = type1;
break;
}
if( type1 != E )
if( result_type == E) {
syntax_error(operator->line_num,operator->col_num,
"expression incompatible with operator:");
msg_tail(operator->src_text);
msg_tail("used with");
report_type(term1);
}
else if(result_type >= W) {
if(f77_mixed_expr) {
warning(operator->line_num,operator->col_num,
"nonstandard type used with operator:");
msg_tail(operator->src_text);
msg_tail("used with");
report_type(term1);
}
result_type -= W;
}
}
result->TOK_type = type_byte(class_VAR, result_type);
result->TOK_flags = 0; /* clear all flags */
result->size = term1->size; /* result is same size as operand */
/* Keep track of constant expressions */
copy_flag(CONST_EXPR,result->TOK_flags,term1->TOK_flags);
copy_flag(PARAMETER_EXPR,result->TOK_flags,term1->TOK_flags);
/* Remember if integer division was used */
if(result_type == type_INTEGER)
copy_flag(INT_QUOTIENT_EXPR,result->TOK_flags,term1->TOK_flags);
if(is_true(ID_EXPR,term1->TOK_flags))
use_variable(term1);
/* Propagate the value of integer constant expressions */
if(is_true(EVALUATED_EXPR,term1->TOK_flags)) {
if(result_type == type_INTEGER) { /* Only ints propagated */
int a = int_expr_value(term1),
c;
switch(op) {
case '+': c = a; break;
case '-': c = -a; break;
case tok_NOT: c = ~a; break;
default: oops_message(OOPS_NONFATAL,
operator->line_num,operator->col_num,
"invalid int expr operator");
c = 0; break;
}
make_true(EVALUATED_EXPR,result->TOK_flags);
result->value.integer = c; /* Result goes into token value */
}
}
}
/* this routine checks type and size match in assignment statements
and in parameter assignments */
void
#if HAVE_STDC
assignment_stmt_type(Token *term1, Token *equals, Token *term2)
#else /* K&R style */
assignment_stmt_type(term1,equals,term2)
Token *term1, *equals, *term2;
#endif /* HAVE_STDC */
{
int type1 = datatype_of(term1->TOK_type),
type2 = datatype_of(term2->TOK_type),
result_type;
if( ! is_computational_type(type1) ) {
syntax_error(term1->line_num,term1->col_num,
"noncomputational primary in expression:");
report_type(term1);
result_type = E;
}
else if( ! is_computational_type(type2) ) {
syntax_error(term2->line_num,term2->col_num,
"noncomputational primary in expression:");
report_type(term2);
result_type = E;
}
else {
result_type = (unsigned)assignment_type[type1][type2];
if( (type1 != E && type2 != E) ) {
if( result_type == E) {
syntax_error(equals->line_num,equals->col_num,
"type mismatch:");
report_type(term2);
msg_tail("assigned to");
report_type(term1);
}
else {
if(result_type >= W) { /* W result */
if(f77_mixed_expr) {
warning(equals->line_num,equals->col_num,
"nonstandard type combination:");
report_type(term2);
msg_tail("assigned to");
report_type(term1);
}
result_type -= W;
}
/* Watch for truncation to lower precision type */
if(trunc_precision ||
port_mixed_size || local_wordsize==0) {
long size1 = term1->size;
long size2 = term2->size;
int type_trunc=FALSE, /* flags for kind of truncation */
size_trunc=FALSE,
mixed_size=FALSE,
promotion=FALSE,
trunc_warn,mixed_warn;
if(size1 == size_DEFAULT && size2 == size_DEFAULT) {
type_trunc = ( is_numeric_type(type1) &&
is_numeric_type(type2) &&
(type1 < type2 ||
/* C = D truncates precision of D */
(type1 == C && type2 == D)) );
/* Watch for promotions also */
if(type_category[type2] == R) {
if(type_category[type1] == R) /* R|D = R|D */
promotion = (type1 > type2);
else if(type_category[type1] == C) /* C|Z = R|D */
promotion =
((int)type_size[type1] > 2*(int)type_size[type2]);
}
else if(type_category[type2] == C) /* any = C|Z */
promotion = (type1 > type2);
}
else if(type1 == S) { /* character strings */
if(size1>0 && size2>0) /* ignore ADJUSTABLE and UNKNOWN */
size_trunc = size1 < size2;
} else {
int tc1,tc2;/* type categories: D->R, Z->C, H->I */
int ls1,ls2;/* local sizes */
/* Assign type categories and local sizes */
tc1 = type_category[type1];
tc2 = type_category[type2];
ls1 = size1; if(ls1 == size_DEFAULT) ls1 = type_size[type1];
ls2 = size2; if(ls2 == size_DEFAULT) ls2 = type_size[type2];
/* type truncation: any numeric type category
to a lower category. */
type_trunc = ( /***is_numeric_type(type1) &&
is_numeric_type(type2) &&***/
tc1 < tc2 );
/* size truncation: assigned to smaller
local size. For C = R correct test is
Csize < 2*Rsize */
if(tc1 == C && tc2 == R) {
size_trunc = (ls1 < ls2*2);
promotion = (ls1 > ls2*2);
}
else {
size_trunc = (ls1 < ls2);
promotion = ((tc2 == R || tc2 == C) && (ls1 > ls2));
}
/* mixed size: default size assigned to
declared size of like type category
or vice-versa. -port only, and superseded
by truncation warning if any. */
mixed_size = (tc1 == tc2) &&
(size1==size_DEFAULT ||
(size2==size_DEFAULT &&
!is_true(CONST_EXPR,term2->TOK_flags)));
}
/* Under -trunc, report type truncation or size
truncation. Say "possibly" if -nowordsize.
Also report promotions under -trunc.
If no truncation warning given and under -port,
report mixed assignment */
#ifdef DEBUG_EXPRTYPE
#define TorF(x) ((x)?"":"no")
if(debug_latest) {
(void)fprintf(list_fd,"\nassign %s =",sized_typename(type1,size1));
(void)fprintf(list_fd," %s : ",sized_typename(type2,size2));
(void)fprintf(list_fd,"%s type %s size %s mixed",
TorF(type_trunc),
TorF(size_trunc),
TorF(mixed_size));
}
#endif
trunc_warn = (trunc_promotion && promotion) ||
(trunc_type_demotion && type_trunc) ||
(trunc_size_demotion && size_trunc);
mixed_warn = ((port_mixed_size || local_wordsize==0) &&
mixed_size);
if( trunc_warn ) {
warning(equals->line_num,equals->col_num,"");
report_type(term2);
if(trunc_warn && !type_trunc && mixed_size
&& local_wordsize == 0)
msg_tail("possibly");
if(promotion)
msg_tail("promoted to");
else
msg_tail("truncated to");
report_type(term1);
if(promotion)
msg_tail(": may not give desired precision");
}
else if(mixed_warn) {
nonportable(equals->line_num,equals->col_num,
"mixed default and explicit");
msg_tail((is_numeric_type(type1)&&is_numeric_type(type2))?
"precision":"size");
msg_tail("items:");
report_type(term2);
msg_tail("assigned to");
report_type(term1);
}
}
}/*end else (result_type != E)*/
}/*end if (type1,type2 != E)*/
}/*end else (is_computational_type(type2))*/
/* Issue warning if integer expr involving division is
later converted to any real type. */
if(trunc_int_div_real)
if( is_true(INT_QUOTIENT_EXPR,term2->TOK_flags) ) {
int r=result_type;
if( r == type_REAL || r == type_DP || r == type_COMPLEX)
warning(equals->line_num,equals->col_num,
"integer quotient expr converted to real");
}
if(is_true(ID_EXPR,term2->TOK_flags))
use_variable(term2);
use_lvalue(term1);
}
/* Make an expression-token for a function invocation */
void
#if HAVE_STDC
func_ref_expr(Token *id, Token *args, Token *result)
#else /* K&R style */
func_ref_expr(id,args,result)
Token *id,*args,*result;
#endif /* HAVE_STDC */
{
Lsymtab *symt;
IntrinsInfo *defn;
int rettype, retsize;
symt = hashtab[id->value.integer].loc_symtab;
if( symt->intrinsic ) {
defn = symt->info.intrins_info;
/* Intrinsic functions: type stored in info field */
rettype = defn->result_type;
retsize = size_DEFAULT;
if( defn->intrins_flags & I_QUAD ) { /* Quad intrinsic */
/* These are either R*16 or X*32 */
retsize = ((rettype==type_QUAD)? size_QUAD: size_CQUAD);
}
/* Generic Intrinsic functions: use propagated arg type */
if(rettype == type_GENERIC) {
if(args->next_token == NULL) {
rettype = type_UNDECL;
retsize = size_DEFAULT;
}
else {
#ifdef OLDSTUFF
rettype = args->next_token->TOK_type;
retsize = args->next_token->size;
#else
rettype = args->TOK_type;
retsize = args->size;
#endif
}
/* special case: REAL(integer|[d]real) -> real */
if((defn->intrins_flags&I_SP_R) &&
(rettype != type_COMPLEX) && (rettype != type_DCOMPLEX)) {
rettype = type_REAL;
retsize = size_DEFAULT;
}
/* special cases: */
/* ABS([d]complex) -> [d]real */
/* IMAG([d]complex) -> [d]real */
/* REAL([d]complex) -> [d]real */
if(rettype == type_COMPLEX && (defn->intrins_flags&I_C_TO_R)) {
rettype = type_REAL;
retsize = retsize/2;
}
if(rettype == type_DCOMPLEX &&(defn->intrins_flags&I_C_TO_R)) {
rettype = type_DP;
retsize = size_DEFAULT;
}
}
else { /* non-generic */
/* special case: CHAR(code): size=1 */
if(defn->intrins_flags&I_CHAR) {
retsize = 1;
}
}
}
else { /* non-intrinsic */
rettype = get_type(symt);
retsize = get_size(symt,rettype);
}
/* referencing function makes it no longer a class_SUBPROGRAM
but an expression. */
#ifndef TOK_type
result->class = id->class;
#endif
result->subclass = 0;
result->TOK_type = type_byte(class_VAR,rettype);
#ifndef TOK_flags
result->TOK_flags = 0; /* clear all flags */
#endif
result->size = retsize;
result->next_token = (Token *)NULL;
#ifdef DEBUG_EXPRTYPE
if(debug_latest) {
(void)fprintf(list_fd,"\n%sFunction %s() = %s",
symt->intrinsic?"Intrinsic ":"",
symt->name,sized_typename(rettype,retsize));
}
#endif
/* If intrinsic and all arguments are PARAMETER_EXPRs,
then result is one too. */
if( symt->intrinsic ) {
/* Evaluate intrinsic if result is
integer, the args are const (except for
LEN), and a handler is defined.
*/
if(rettype == type_INTEGER &&
(defn->intrins_flags&I_EVALUATED) )
{
result->value.integer = eval_intrins(defn,args);
/* Evaluation routines can affect the flags */
copy_flag(EVALUATED_EXPR,result->TOK_flags,args->TOK_flags);
}
copy_flag(PARAMETER_EXPR,result->TOK_flags,args->TOK_flags);
#ifdef DEBUG_EXPRTYPE
if(debug_latest) {
(void)fprintf(list_fd,"\n%s(...) ",defn->name);
if(is_true(EVALUATED_EXPR,args->TOK_flags))
(void)fprintf(list_fd,"=%d",result->value.integer);
else
(void)fprintf(list_fd,"not evaluated");
(void)fprintf(list_fd,": const param eval=(%d %d %d)",
is_true(CONST_EXPR,result->TOK_flags),
is_true(PARAMETER_EXPR,result->TOK_flags),
is_true(EVALUATED_EXPR,result->TOK_flags));
}
#endif
}
}/*func_ref_expr*/
/* Make an expression-token for primary consisting of
a symbolic name */
void
#if HAVE_STDC
primary_id_expr(Token *id, Token *primary)
#else /* K&R style */
primary_id_expr(id,primary)
Token *id,*primary;
#endif /* HAVE_STDC */
{
Lsymtab *symt;
int id_type;
symt = hashtab[id->value.integer].loc_symtab;
id_type=get_type(symt);
#ifndef TOK_type
primary->class = id->class;
#endif
primary->subclass = 0;
primary->TOK_type = type_byte(storage_class_of(symt->type),id_type);
#ifndef TOK_flags
primary->TOK_flags = 0;
#endif
primary->size =get_size(symt,id_type);
primary->left_token = (Token *) NULL;
make_true(ID_EXPR,primary->TOK_flags);
if( storage_class_of(symt->type) == class_VAR) {
if(symt->parameter) {
make_true(CONST_EXPR,primary->TOK_flags);
make_true(PARAMETER_EXPR,primary->TOK_flags);
make_true(EVALUATED_EXPR,primary->TOK_flags);
}
else {
make_true(LVALUE_EXPR,primary->TOK_flags);
}
if(symt->array_var)
make_true(ARRAY_ID_EXPR,primary->TOK_flags);
if(symt->set_flag || symt->common_var || symt->parameter
|| symt->argument)
make_true(SET_FLAG,primary->TOK_flags);
if(symt->assigned_flag)
make_true(ASSIGNED_FLAG,primary->TOK_flags);
if(symt->used_before_set)
make_true(USED_BEFORE_SET,primary->TOK_flags);
}
else if(storage_class_of(symt->type) == class_STMT_FUNCTION) {
make_true(STMT_FUNCTION_EXPR,primary->TOK_flags);
}
#ifdef DEBUG_PARSER
if(debug_parser){
(void)fprintf(list_fd,"\nprimary %s: TOK_type=0x%x TOK_flags=0x%x",
symt->name,primary->TOK_type,primary->TOK_flags);
}
#endif
}/*primary_id_expr*/
int
#if HAVE_STDC
intrins_arg_cmp(IntrinsInfo *defn, Token *t)
/* Definition */
/* Argument */
#else /* K&R style */
intrins_arg_cmp(defn,t)
IntrinsInfo *defn; /* Definition */
Token *t; /* Argument */
#endif /* HAVE_STDC */
{
int defn_types=defn->arg_type;
int a_type = datatype_of(t->TOK_type);
int type_OK;
/* Check for argument type mismatch.
*/
type_OK = ( (1<<a_type) & defn_types );
if(! type_OK) {
int ct;/* compatible type */
/* Accept compatible types if
sizes agree, e.g. DSQRT(REAL*8).
The macros check the two cases and
set ct to the compatible type.
*/
#define EXCEPTION1 (a_type==type_REAL && ((1<<(ct=type_DP))&defn_types))
#define EXCEPTION2 (a_type==type_COMPLEX&&((1<<(ct=type_DCOMPLEX))&defn_types))
if(!( (EXCEPTION1||EXCEPTION2) && t->size==type_size[ct] )){
syntax_error(t->line_num,t->col_num,
"illegal argument data type for intrinsic function");
msg_tail(defn->name);
msg_tail(":");
report_type(t);
}
else {
if(port_mixed_size || local_wordsize==0) {
nonportable(t->line_num,t->col_num,
"argument precision may not be correct for intrinsic function");
msg_tail(defn->name);
msg_tail(":");
report_type(t);
}
type_OK = TRUE; /* Acceptable after all */
}
}/* end if(! type_OK) */
/* Quad intrinsics need a special check
to verify that real or cplx arg size is right.
*/
else if(defn->intrins_flags & I_QARG) {
if(t->size != ((a_type==type_REAL)? size_QUAD: size_CQUAD)) {
syntax_error(t->line_num,t->col_num,
"illegal argument data type for intrinsic function");
msg_tail(defn->name);
msg_tail(":");
report_type(t);
}
}
return type_OK;
}/*intrins_arg_cmp*/
/* Check agreement between statement function
dummy (t1) and actual (t2) args. At this
time, checks only class, type and size,
not arrayness. */
void
#if HAVE_STDC
stmt_fun_arg_cmp(Lsymtab *symt, Token *d_arg, Token *a_arg)
#else /* K&R style */
stmt_fun_arg_cmp(symt,d_arg,a_arg)
Lsymtab *symt;
Token *d_arg,*a_arg;
#endif /* HAVE_STDC */
{
int d_class = class_VAR,
a_class = storage_class_of(a_arg->TOK_type),
d_type = datatype_of(d_arg->TOK_type),
a_type = datatype_of(a_arg->TOK_type),
d_size = d_arg->size,
a_size = a_arg->size,
d_defsize = (d_size == size_DEFAULT),
a_defsize = (a_size == size_DEFAULT);
int d_cmptype= (d_type==type_HOLLERITH && a_type!=type_STRING)?
a_type:type_category[d_type];
int a_cmptype= (a_type==type_HOLLERITH && d_type!=type_STRING)?
d_type:type_category[a_type];
if(!(port_mixed_size || local_wordsize==0)) {
if(d_defsize)
d_size = type_size[d_type];
if(a_defsize)
a_size = type_size[a_type];
}
if(d_size < 0 || a_size < 0) { /* char size_ADJUSTABLE or UNKNOWN */
d_size = a_size = size_DEFAULT; /* suppress warnings on size */
d_defsize = a_defsize = TRUE;
}
if(d_class != a_class || d_cmptype != a_cmptype ||
(d_type == type_STRING? d_size > a_size: d_size != a_size) ) {
syntax_error(a_arg->line_num,a_arg->col_num,
"argument mismatch in stmt function");
msg_tail(symt->name); /* Give the stmt func name */
msg_tail(": dummy");
report_type(d_arg); /* Dummy arg type */
msg_tail("vs actual");
report_type(a_arg);
}
}/*stmt_fun_arg_cmp*/
/* Routine to document the types of
two terms and their operator */
PRIVATE void
#if HAVE_STDC
report_mismatch(Token *term1, Token *operator, Token *term2)
#else /* K&R style */
report_mismatch(term1,operator,term2)
Token *term1,*operator,*term2;
#endif /* HAVE_STDC */
{
report_type(term1);
msg_tail(operator->src_text);
report_type(term2);
}
/* Routine to document the type
of a token, with its name if it
has one. */
PRIVATE void
#if HAVE_STDC
report_type(Token *t)
#else /* K&R style */
report_type(t)
Token *t;
#endif /* HAVE_STDC */
{
msg_tail(sized_typename((int)datatype_of(t->TOK_type),t->size));
if(is_true(ID_EXPR,t->TOK_flags))
msg_tail(hashtab[t->value.integer].name);
else if(is_true(LIT_CONST,t->TOK_flags))
msg_tail("const");
else
msg_tail("expr");
}
int
#if HAVE_STDC
substring_size(Token *id, Token *limits)
#else /* K&R style */
substring_size(id,limits)
Token *id,*limits;
#endif /* HAVE_STDC */
{
int id_type,id_len;
int startindex,endindex,substr_len;
#ifdef DEBUG_EXPRTREES
Lsymtab *symt = hashtab[id->value.integer].loc_symtab;
#endif
/*** id_type=get_type(symt); **/
id_type = datatype_of(id->TOK_type);
substr_len=size_UNKNOWN;
if(id_type != type_STRING) {
syntax_error(id->line_num,id->col_num,
"string variable expected");
}
else {
id_len = id->size;
#ifdef DEBUG_EXPRTREES
if(debug_latest) {
fprintf(list_fd,"\nSubstring %s :: ",symt->name);
print_expr_list(limits);
}
#endif
/* fortran.y stores (startindex:endindex) in
TOK_start, Tok_end */
startindex = limits->TOK_start;
endindex = limits->TOK_end;
if(startindex != size_UNKNOWN && endindex != size_UNKNOWN) {
/* Check limits unless endindex=0 */
if( startindex > endindex && endindex > 0 ) {
syntax_error(limits->line_num,limits->col_num,
"invalid substring limits");
}
else {
if(endindex == 0) /* 0 means it was (startindex: ) */
endindex=id_len;
substr_len = endindex-startindex+1;
if(id_len > 0 && substr_len > id_len)
syntax_error(limits->line_num,limits->col_num,
"substring size exceeds string size");
}
}
}
return substr_len;
}
/* Integer power: uses recursion x**n = (x**(n/2))**2 */
PRIVATE int
#if HAVE_STDC
int_power(int x, int n)
#else /* K&R style */
int_power(x,n)
int x,n;
#endif /* HAVE_STDC */
{
int temp;
/* Order of tests puts commonest cases first */
if(n > 1) {
temp = int_power(x,n>>1);
temp *= temp;
if(n&1) return temp*x; /* Odd n */
else return temp; /* Even n */
}
else if(n == 1) return x;
else if(n < 0) return 1/int_power(x,-n); /* Usually 0 */
else return 1;
}
/* Intrinsic function handlers */
PROTO(PRIVATE int ii_abs,( Token *args ));
PROTO(PRIVATE int ii_dim,( Token *args ));
PROTO(PRIVATE int ii_ichar,( Token *args ));
PROTO(PRIVATE int ii_index,( Token *args ));
PROTO(PRIVATE int ii_len,( Token *args ));
PROTO(PRIVATE int ii_max,( Token *args ));
PROTO(PRIVATE int ii_min,( Token *args ));
PROTO(PRIVATE int ii_mod,( Token *args ));
PROTO(PRIVATE int ii_sign,( Token *args ));
/* Array of pointers to functions for evaluating integer-valued intrinsic
functions. The order matches definitions of I_ABS thru I_INDEX in
symtab.h */
PROTO(PRIVATE int (*ii_fun[]),( Token *args ))
={
NULL,
ii_abs,
ii_sign,
ii_dim,
ii_mod,
ii_max,
ii_min,
ii_ichar,
ii_len,
ii_index,
};
PRIVATE int
#if HAVE_STDC
eval_intrins(IntrinsInfo *defn, Token *args)
#else /* K&R style */
eval_intrins(defn,args)
IntrinsInfo *defn;
Token *args;
#endif /* HAVE_STDC */
{
int index;
index = (defn->intrins_flags & I_EVALUATED);
/* Args must be evaluated, except for LEN */
if( (is_true(EVALUATED_EXPR,args->TOK_flags) || index==I_LEN) &&
index > 0 && index < (sizeof(ii_fun)/sizeof(ii_fun[0])) ) {
return (*ii_fun[index])(args);
}
else {
#ifdef DEBUG_EXPRTYPE
if(debug_latest)
(void)fprintf(list_fd,"\nIntrinsic %s not handled",defn->name);
make_false(EVALUATED_EXPR,args->TOK_flags);
#endif
return 0;
}
}
PRIVATE int
#if HAVE_STDC
ii_abs(Token *args)
#else /* K&R style */
ii_abs(args)
Token *args;
#endif /* HAVE_STDC */
{
Token *t;
int val, result=0;
t = args->next_token;
if(t->TOK_type != type_INTEGER) {/* wrong arg type: message given elsewhere */
make_false(EVALUATED_EXPR,args->TOK_flags);
}
else {
val = int_expr_value(t);
result = (val >= 0? val: -val);
}
return result;
}
PRIVATE int
#if HAVE_STDC
ii_sign(Token *args) /* SIGN(value,sign) */
#else /* K&R style */
ii_sign(args) /* SIGN(value,sign) */
Token *args;
#endif /* HAVE_STDC */
{
Token *t1,*t2;
int val1,val2, result=0;
t1 = args->next_token;
t2 = t1->next_token;
if(t2 == NULL || t1->TOK_type != type_INTEGER
|| t2->TOK_type != type_INTEGER) {/* wrong arg type: message given elswr */
make_false(EVALUATED_EXPR,args->TOK_flags);
}
else {
val1 = int_expr_value(t1);
if(val1 < 0) val1 = -val1;
val2 = int_expr_value(t2);
result = (val2 >= 0? val1: -val1);
}
return result;
}
PRIVATE int
#if HAVE_STDC
ii_dim(Token *args) /* DIM(int,int) */
#else /* K&R style */
ii_dim(args) /* DIM(int,int) */
Token *args;
#endif /* HAVE_STDC */
{
Token *t1,*t2;
int val, result=0;
t1 = args->next_token;
t2 = t1->next_token;
if(t2 == NULL || t1->TOK_type != type_INTEGER
|| t2->TOK_type != type_INTEGER) {/* wrong arg type: message given elswr */
make_false(EVALUATED_EXPR,args->TOK_flags);
}
else {
val = int_expr_value(t1)-int_expr_value(t2);
result = (val >= 0? val: 0);
}
return result;
}
PRIVATE int
#if HAVE_STDC
ii_mod(Token *args) /* MOD(int,int) */
#else /* K&R style */
ii_mod(args) /* MOD(int,int) */
Token *args;
#endif /* HAVE_STDC */
{
Token *t1,*t2;
int val1,val2,quotient, result=0;
t1 = args->next_token;
t2 = t1->next_token;
if(t2 == NULL || t1->TOK_type != type_INTEGER
|| t2->TOK_type != type_INTEGER) {/* wrong arg type: message given elswr */
make_false(EVALUATED_EXPR,args->TOK_flags);
}
else {
val1 = int_expr_value(t1);
val2 = int_expr_value(t2);
if((val1 < 0) == (val2 < 0)) {
quotient = val1/val2; /* Both positive or both negative*/
}
else {
quotient = -(-val1/val2); /* Unlike signs */
}
result = val1 - quotient*val2;
}
return result;
}
PRIVATE int
#if HAVE_STDC
ii_max(Token *args) /* MAX(int,int,...) */
#else /* K&R style */
ii_max(args) /* MAX(int,int,...) */
Token *args;
#endif /* HAVE_STDC */
{
Token *t=args;
int val,result=0,n=0;
#ifdef DEBUG_EXPRTYPE
if(debug_latest)
(void)fprintf(list_fd,"\nEvaluating MAX(");
#endif
while( (t=t->next_token) != NULL) {
if(t->TOK_type != type_INTEGER) {/* wrong arg type: message given elswr */
make_false(EVALUATED_EXPR,args->TOK_flags);
break;
}
else {
val = int_expr_value(t);
if(n++ == 0 || val > result)
result = val;
#ifdef DEBUG_EXPRTYPE
if(debug_latest)
(void)fprintf(list_fd,"%d ",val);
#endif
}
}
#ifdef DEBUG_EXPRTYPE
if(debug_latest)
(void)fprintf(list_fd,") = %d",result);
#endif
return result;
}
PRIVATE int
#if HAVE_STDC
ii_min(Token *args) /* MIN(int,int,...) */
#else /* K&R style */
ii_min(args) /* MIN(int,int,...) */
Token *args;
#endif /* HAVE_STDC */
{
Token *t=args;
int val,result=0,n=0;
while( (t=t->next_token) != NULL) {
if(t->TOK_type != type_INTEGER) {/* wrong arg type: message given elswr */
make_false(EVALUATED_EXPR,args->TOK_flags);
break;
}
else {
val = int_expr_value(t);
if(n++ == 0 || val < result)
result = val;
}
}
return result;
}
PRIVATE int
#if HAVE_STDC
ii_ichar(Token *args) /* ICHAR(string) */
#else /* K&R style */
ii_ichar(args) /* ICHAR(string) */
Token *args;
#endif /* HAVE_STDC */
{
Token *t=args->next_token;
if(t->TOK_type != type_STRING || !is_true(LIT_CONST,t->TOK_flags)) {
make_false(EVALUATED_EXPR,args->TOK_flags);
}
else {
return t->value.string[0]; /* Processor collating sequence is used */
}
return 0;
}
PRIVATE int
#if HAVE_STDC
ii_len(Token *args) /* LEN(string) */
#else /* K&R style */
ii_len(args) /* LEN(string) */
Token *args;
#endif /* HAVE_STDC */
{
Token *t=args->next_token;
int val,result=0;
/* Set the PARAMETER_EXPR flag since LEN of string does
not require contents to be known */
if( t->TOK_type == type_STRING && (val = t->size) > 0 ) {
make_true(PARAMETER_EXPR,args->TOK_flags);
make_true(EVALUATED_EXPR,args->TOK_flags);
result = val;
}
else { /* nonstring or adjustable or unknown */
make_false(PARAMETER_EXPR,args->TOK_flags);
make_false(EVALUATED_EXPR,args->TOK_flags);
}
return result;
}
PRIVATE int
#if HAVE_STDC
ii_index(Token *args) /* INDEX(str1,str2) */
#else /* K&R style */
ii_index(args) /* INDEX(str1,str2) */
Token *args;
#endif /* HAVE_STDC */
{
Token *t1,*t2;
t1=args->next_token;
t2=t1->next_token;
if(t2 == NULL || t1->TOK_type != type_STRING
|| t2->TOK_type != type_STRING
|| !is_true(LIT_CONST,t1->TOK_flags) || !is_true(LIT_CONST,t2->TOK_flags)) {
make_false(EVALUATED_EXPR,args->TOK_flags);
}
else {
int i;
char *s1=t1->value.string;
char *s2=t2->value.string;
int n1=strlen(s1), n2=strlen(s2);
for(i=1; n1 > 0 && n1 >= n2; i++,s1++,n1--) {
if(strncmp(s1,s2,n2) == 0)
return i;
}
}
return 0;
}
/* Undefine special macros */
#undef E
#undef I
#undef R
#undef D
#undef C
#undef L
#undef S
#undef H
#undef W