#include "config.h"
#include <string.h>
#include "gfortran.h"
#include "arith.h"
#include "match.h"
static char expression_syntax[] = "Syntax error in expression at %C";
match
gfc_match_defined_op_name (char *result, int error_flag)
{
static const char * const badops[] = {
"and", "or", "not", "eqv", "neqv", "eq", "ne", "ge", "le", "lt", "gt",
NULL
};
char name[GFC_MAX_SYMBOL_LEN + 1];
locus old_loc;
match m;
int i;
old_loc = gfc_current_locus;
m = gfc_match (" . %n .", name);
if (m != MATCH_YES)
return m;
if (strcmp (name, "true") == 0 || strcmp (name, "false") == 0)
{
if (error_flag)
goto error;
gfc_current_locus = old_loc;
return MATCH_NO;
}
for (i = 0; badops[i]; i++)
if (strcmp (badops[i], name) == 0)
goto error;
for (i = 0; name[i]; i++)
if (!ISALPHA (name[i]))
{
gfc_error ("Bad character '%c' in OPERATOR name at %C", name[i]);
return MATCH_ERROR;
}
strcpy (result, name);
return MATCH_YES;
error:
gfc_error ("The name '%s' cannot be used as a defined operator at %C",
name);
gfc_current_locus = old_loc;
return MATCH_ERROR;
}
static match
match_defined_operator (gfc_user_op ** result)
{
char name[GFC_MAX_SYMBOL_LEN + 1];
match m;
m = gfc_match_defined_op_name (name, 0);
if (m != MATCH_YES)
return m;
*result = gfc_get_uop (name);
return MATCH_YES;
}
static int
next_operator (gfc_intrinsic_op t)
{
gfc_intrinsic_op u;
locus old_loc;
old_loc = gfc_current_locus;
if (gfc_match_intrinsic_op (&u) == MATCH_YES && t == u)
return 1;
gfc_current_locus = old_loc;
return 0;
}
static match
match_primary (gfc_expr ** result)
{
match m;
m = gfc_match_literal_constant (result, 0);
if (m != MATCH_NO)
return m;
m = gfc_match_array_constructor (result);
if (m != MATCH_NO)
return m;
m = gfc_match_rvalue (result);
if (m != MATCH_NO)
return m;
if (gfc_match_char ('(') != MATCH_YES)
return MATCH_NO;
m = gfc_match_expr (result);
if (m == MATCH_NO)
goto syntax;
if (m == MATCH_ERROR)
return m;
m = gfc_match_char (')');
if (m == MATCH_NO)
gfc_error ("Expected a right parenthesis in expression at %C");
if (m != MATCH_YES)
{
gfc_free_expr (*result);
return MATCH_ERROR;
}
return MATCH_YES;
syntax:
gfc_error (expression_syntax);
return MATCH_ERROR;
}
static gfc_expr *
build_node (gfc_intrinsic_op operator, locus * where,
gfc_expr * op1, gfc_expr * op2)
{
gfc_expr *new;
new = gfc_get_expr ();
new->expr_type = EXPR_OP;
new->operator = operator;
new->where = *where;
new->op1 = op1;
new->op2 = op2;
return new;
}
static match
match_level_1 (gfc_expr ** result)
{
gfc_user_op *uop;
gfc_expr *e, *f;
locus where;
match m;
where = gfc_current_locus;
uop = NULL;
m = match_defined_operator (&uop);
if (m == MATCH_ERROR)
return m;
m = match_primary (&e);
if (m != MATCH_YES)
return m;
if (uop == NULL)
*result = e;
else
{
f = build_node (INTRINSIC_USER, &where, e, NULL);
f->uop = uop;
*result = f;
}
return MATCH_YES;
}
static match match_ext_mult_operand (gfc_expr ** result);
static match match_ext_add_operand (gfc_expr ** result);
static int
match_add_op (void)
{
if (next_operator (INTRINSIC_MINUS))
return -1;
if (next_operator (INTRINSIC_PLUS))
return 1;
return 0;
}
static match
match_mult_operand (gfc_expr ** result)
{
gfc_expr *e, *exp, *r;
locus where;
match m;
m = match_level_1 (&e);
if (m != MATCH_YES)
return m;
if (!next_operator (INTRINSIC_POWER))
{
*result = e;
return MATCH_YES;
}
where = gfc_current_locus;
m = match_ext_mult_operand (&exp);
if (m == MATCH_NO)
gfc_error ("Expected exponent in expression at %C");
if (m != MATCH_YES)
{
gfc_free_expr (e);
return MATCH_ERROR;
}
r = gfc_power (e, exp);
if (r == NULL)
{
gfc_free_expr (e);
gfc_free_expr (exp);
return MATCH_ERROR;
}
r->where = where;
*result = r;
return MATCH_YES;
}
static match
match_ext_mult_operand (gfc_expr ** result)
{
gfc_expr *all, *e;
locus where;
match m;
int i;
where = gfc_current_locus;
i = match_add_op ();
if (i == 0)
return match_mult_operand (result);
if (gfc_notify_std (GFC_STD_GNU, "Extension: Unary operator following"
" arithmetic operator (use parentheses) at %C")
== FAILURE)
return MATCH_ERROR;
m = match_ext_mult_operand (&e);
if (m != MATCH_YES)
return m;
if (i == -1)
all = gfc_uminus (e);
else
all = gfc_uplus (e);
if (all == NULL)
{
gfc_free_expr (e);
return MATCH_ERROR;
}
all->where = where;
*result = all;
return MATCH_YES;
}
static match
match_add_operand (gfc_expr ** result)
{
gfc_expr *all, *e, *total;
locus where, old_loc;
match m;
gfc_intrinsic_op i;
m = match_mult_operand (&all);
if (m != MATCH_YES)
return m;
for (;;)
{
old_loc = gfc_current_locus;
if (next_operator (INTRINSIC_TIMES))
i = INTRINSIC_TIMES;
else
{
if (next_operator (INTRINSIC_DIVIDE))
i = INTRINSIC_DIVIDE;
else
break;
}
where = gfc_current_locus;
m = match_ext_mult_operand (&e);
if (m == MATCH_NO)
{
gfc_current_locus = old_loc;
break;
}
if (m == MATCH_ERROR)
{
gfc_free_expr (all);
return MATCH_ERROR;
}
if (i == INTRINSIC_TIMES)
total = gfc_multiply (all, e);
else
total = gfc_divide (all, e);
if (total == NULL)
{
gfc_free_expr (all);
gfc_free_expr (e);
return MATCH_ERROR;
}
all = total;
all->where = where;
}
*result = all;
return MATCH_YES;
}
static match
match_ext_add_operand (gfc_expr ** result)
{
gfc_expr *all, *e;
locus where;
match m;
int i;
where = gfc_current_locus;
i = match_add_op ();
if (i == 0)
return match_add_operand (result);
if (gfc_notify_std (GFC_STD_GNU, "Extension: Unary operator following"
" arithmetic operator (use parentheses) at %C")
== FAILURE)
return MATCH_ERROR;
m = match_ext_add_operand (&e);
if (m != MATCH_YES)
return m;
if (i == -1)
all = gfc_uminus (e);
else
all = gfc_uplus (e);
if (all == NULL)
{
gfc_free_expr (e);
return MATCH_ERROR;
}
all->where = where;
*result = all;
return MATCH_YES;
}
static match
match_level_2 (gfc_expr ** result)
{
gfc_expr *all, *e, *total;
locus where;
match m;
int i;
where = gfc_current_locus;
i = match_add_op ();
if (i != 0)
{
m = match_ext_add_operand (&e);
if (m == MATCH_NO)
{
gfc_error (expression_syntax);
m = MATCH_ERROR;
}
}
else
m = match_add_operand (&e);
if (m != MATCH_YES)
return m;
if (i == 0)
all = e;
else
{
if (i == -1)
all = gfc_uminus (e);
else
all = gfc_uplus (e);
if (all == NULL)
{
gfc_free_expr (e);
return MATCH_ERROR;
}
}
all->where = where;
for (;;)
{
where = gfc_current_locus;
i = match_add_op ();
if (i == 0)
break;
m = match_ext_add_operand (&e);
if (m == MATCH_NO)
gfc_error (expression_syntax);
if (m != MATCH_YES)
{
gfc_free_expr (all);
return MATCH_ERROR;
}
if (i == -1)
total = gfc_subtract (all, e);
else
total = gfc_add (all, e);
if (total == NULL)
{
gfc_free_expr (all);
gfc_free_expr (e);
return MATCH_ERROR;
}
all = total;
all->where = where;
}
*result = all;
return MATCH_YES;
}
static match
match_level_3 (gfc_expr ** result)
{
gfc_expr *all, *e, *total;
locus where;
match m;
m = match_level_2 (&all);
if (m != MATCH_YES)
return m;
for (;;)
{
if (!next_operator (INTRINSIC_CONCAT))
break;
where = gfc_current_locus;
m = match_level_2 (&e);
if (m == MATCH_NO)
{
gfc_error (expression_syntax);
gfc_free_expr (all);
}
if (m != MATCH_YES)
return MATCH_ERROR;
total = gfc_concat (all, e);
if (total == NULL)
{
gfc_free_expr (all);
gfc_free_expr (e);
return MATCH_ERROR;
}
all = total;
all->where = where;
}
*result = all;
return MATCH_YES;
}
static match
match_level_4 (gfc_expr ** result)
{
gfc_expr *left, *right, *r;
gfc_intrinsic_op i;
locus old_loc;
locus where;
match m;
m = match_level_3 (&left);
if (m != MATCH_YES)
return m;
old_loc = gfc_current_locus;
if (gfc_match_intrinsic_op (&i) != MATCH_YES)
{
*result = left;
return MATCH_YES;
}
if (i != INTRINSIC_EQ && i != INTRINSIC_NE && i != INTRINSIC_GE
&& i != INTRINSIC_LE && i != INTRINSIC_LT && i != INTRINSIC_GT)
{
gfc_current_locus = old_loc;
*result = left;
return MATCH_YES;
}
where = gfc_current_locus;
m = match_level_3 (&right);
if (m == MATCH_NO)
gfc_error (expression_syntax);
if (m != MATCH_YES)
{
gfc_free_expr (left);
return MATCH_ERROR;
}
switch (i)
{
case INTRINSIC_EQ:
r = gfc_eq (left, right);
break;
case INTRINSIC_NE:
r = gfc_ne (left, right);
break;
case INTRINSIC_LT:
r = gfc_lt (left, right);
break;
case INTRINSIC_LE:
r = gfc_le (left, right);
break;
case INTRINSIC_GT:
r = gfc_gt (left, right);
break;
case INTRINSIC_GE:
r = gfc_ge (left, right);
break;
default:
gfc_internal_error ("match_level_4(): Bad operator");
}
if (r == NULL)
{
gfc_free_expr (left);
gfc_free_expr (right);
return MATCH_ERROR;
}
r->where = where;
*result = r;
return MATCH_YES;
}
static match
match_and_operand (gfc_expr ** result)
{
gfc_expr *e, *r;
locus where;
match m;
int i;
i = next_operator (INTRINSIC_NOT);
where = gfc_current_locus;
m = match_level_4 (&e);
if (m != MATCH_YES)
return m;
r = e;
if (i)
{
r = gfc_not (e);
if (r == NULL)
{
gfc_free_expr (e);
return MATCH_ERROR;
}
}
r->where = where;
*result = r;
return MATCH_YES;
}
static match
match_or_operand (gfc_expr ** result)
{
gfc_expr *all, *e, *total;
locus where;
match m;
m = match_and_operand (&all);
if (m != MATCH_YES)
return m;
for (;;)
{
if (!next_operator (INTRINSIC_AND))
break;
where = gfc_current_locus;
m = match_and_operand (&e);
if (m == MATCH_NO)
gfc_error (expression_syntax);
if (m != MATCH_YES)
{
gfc_free_expr (all);
return MATCH_ERROR;
}
total = gfc_and (all, e);
if (total == NULL)
{
gfc_free_expr (all);
gfc_free_expr (e);
return MATCH_ERROR;
}
all = total;
all->where = where;
}
*result = all;
return MATCH_YES;
}
static match
match_equiv_operand (gfc_expr ** result)
{
gfc_expr *all, *e, *total;
locus where;
match m;
m = match_or_operand (&all);
if (m != MATCH_YES)
return m;
for (;;)
{
if (!next_operator (INTRINSIC_OR))
break;
where = gfc_current_locus;
m = match_or_operand (&e);
if (m == MATCH_NO)
gfc_error (expression_syntax);
if (m != MATCH_YES)
{
gfc_free_expr (all);
return MATCH_ERROR;
}
total = gfc_or (all, e);
if (total == NULL)
{
gfc_free_expr (all);
gfc_free_expr (e);
return MATCH_ERROR;
}
all = total;
all->where = where;
}
*result = all;
return MATCH_YES;
}
static match
match_level_5 (gfc_expr ** result)
{
gfc_expr *all, *e, *total;
locus where;
match m;
gfc_intrinsic_op i;
m = match_equiv_operand (&all);
if (m != MATCH_YES)
return m;
for (;;)
{
if (next_operator (INTRINSIC_EQV))
i = INTRINSIC_EQV;
else
{
if (next_operator (INTRINSIC_NEQV))
i = INTRINSIC_NEQV;
else
break;
}
where = gfc_current_locus;
m = match_equiv_operand (&e);
if (m == MATCH_NO)
gfc_error (expression_syntax);
if (m != MATCH_YES)
{
gfc_free_expr (all);
return MATCH_ERROR;
}
if (i == INTRINSIC_EQV)
total = gfc_eqv (all, e);
else
total = gfc_neqv (all, e);
if (total == NULL)
{
gfc_free_expr (all);
gfc_free_expr (e);
return MATCH_ERROR;
}
all = total;
all->where = where;
}
*result = all;
return MATCH_YES;
}
match
gfc_match_expr (gfc_expr ** result)
{
gfc_expr *all, *e;
gfc_user_op *uop;
locus where;
match m;
m = match_level_5 (&all);
if (m != MATCH_YES)
return m;
for (;;)
{
m = match_defined_operator (&uop);
if (m == MATCH_NO)
break;
if (m == MATCH_ERROR)
{
gfc_free_expr (all);
return MATCH_ERROR;
}
where = gfc_current_locus;
m = match_level_5 (&e);
if (m == MATCH_NO)
gfc_error (expression_syntax);
if (m != MATCH_YES)
{
gfc_free_expr (all);
return MATCH_ERROR;
}
all = build_node (INTRINSIC_USER, &where, all, e);
all->uop = uop;
}
*result = all;
return MATCH_YES;
}