452 lines
11 KiB
C
452 lines
11 KiB
C
/* cond.c - conditional assembly pseudo-ops, and .include
|
|
Copyright (C) 1990, 91, 92, 93, 95, 96, 1997 Free Software Foundation, Inc.
|
|
|
|
This file is part of GAS, the GNU Assembler.
|
|
|
|
GAS is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GAS is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GAS; see the file COPYING. If not, write to the Free
|
|
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
|
|
02111-1307, USA. */
|
|
|
|
#include "as.h"
|
|
#include "macro.h"
|
|
|
|
#include "obstack.h"
|
|
|
|
/* This is allocated to grow and shrink as .ifdef/.endif pairs are scanned. */
|
|
struct obstack cond_obstack;
|
|
|
|
struct file_line
|
|
{
|
|
char *file;
|
|
unsigned int line;
|
|
};
|
|
|
|
/* We push one of these structures for each .if, and pop it at the
|
|
.endif. */
|
|
|
|
struct conditional_frame
|
|
{
|
|
/* The source file & line number of the "if". */
|
|
struct file_line if_file_line;
|
|
/* The source file & line of the "else". */
|
|
struct file_line else_file_line;
|
|
/* The previous conditional. */
|
|
struct conditional_frame *previous_cframe;
|
|
/* Have we seen an else yet? */
|
|
int else_seen;
|
|
/* Whether we are currently ignoring input. */
|
|
int ignoring;
|
|
/* Whether a conditional at a higher level is ignoring input. */
|
|
int dead_tree;
|
|
/* Macro nesting level at which this conditional was created. */
|
|
int macro_nest;
|
|
};
|
|
|
|
static void initialize_cframe PARAMS ((struct conditional_frame *cframe));
|
|
static char *get_mri_string PARAMS ((int, int *));
|
|
|
|
static struct conditional_frame *current_cframe = NULL;
|
|
|
|
void
|
|
s_ifdef (arg)
|
|
int arg;
|
|
{
|
|
register char *name; /* points to name of symbol */
|
|
register struct symbol *symbolP; /* Points to symbol */
|
|
struct conditional_frame cframe;
|
|
|
|
SKIP_WHITESPACE (); /* Leading whitespace is part of operand. */
|
|
name = input_line_pointer;
|
|
|
|
if (!is_name_beginner (*name))
|
|
{
|
|
as_bad ("invalid identifier for \".ifdef\"");
|
|
obstack_1grow (&cond_obstack, 0);
|
|
ignore_rest_of_line ();
|
|
}
|
|
else
|
|
{
|
|
char c;
|
|
|
|
c = get_symbol_end ();
|
|
symbolP = symbol_find (name);
|
|
*input_line_pointer = c;
|
|
|
|
initialize_cframe (&cframe);
|
|
cframe.ignoring = cframe.dead_tree || !((symbolP != 0) ^ arg);
|
|
current_cframe = ((struct conditional_frame *)
|
|
obstack_copy (&cond_obstack, &cframe,
|
|
sizeof (cframe)));
|
|
|
|
if (LISTING_SKIP_COND ()
|
|
&& cframe.ignoring
|
|
&& (cframe.previous_cframe == NULL
|
|
|| ! cframe.previous_cframe->ignoring))
|
|
listing_list (2);
|
|
|
|
demand_empty_rest_of_line ();
|
|
} /* if a valid identifyer name */
|
|
} /* s_ifdef() */
|
|
|
|
void
|
|
s_if (arg)
|
|
int arg;
|
|
{
|
|
expressionS operand;
|
|
struct conditional_frame cframe;
|
|
int t;
|
|
char *stop = NULL;
|
|
char stopc;
|
|
|
|
if (flag_mri)
|
|
stop = mri_comment_field (&stopc);
|
|
|
|
SKIP_WHITESPACE (); /* Leading whitespace is part of operand. */
|
|
|
|
if (current_cframe != NULL && current_cframe->ignoring)
|
|
{
|
|
operand.X_add_number = 0;
|
|
while (! is_end_of_line[(unsigned char) *input_line_pointer])
|
|
++input_line_pointer;
|
|
}
|
|
else
|
|
{
|
|
expression (&operand);
|
|
if (operand.X_op != O_constant)
|
|
as_bad ("non-constant expression in \".if\" statement");
|
|
}
|
|
|
|
switch ((operatorT) arg)
|
|
{
|
|
case O_eq: t = operand.X_add_number == 0; break;
|
|
case O_ne: t = operand.X_add_number != 0; break;
|
|
case O_lt: t = operand.X_add_number < 0; break;
|
|
case O_le: t = operand.X_add_number <= 0; break;
|
|
case O_ge: t = operand.X_add_number >= 0; break;
|
|
case O_gt: t = operand.X_add_number > 0; break;
|
|
default:
|
|
abort ();
|
|
}
|
|
|
|
/* If the above error is signaled, this will dispatch
|
|
using an undefined result. No big deal. */
|
|
initialize_cframe (&cframe);
|
|
cframe.ignoring = cframe.dead_tree || ! t;
|
|
current_cframe = ((struct conditional_frame *)
|
|
obstack_copy (&cond_obstack, &cframe, sizeof (cframe)));
|
|
|
|
if (LISTING_SKIP_COND ()
|
|
&& cframe.ignoring
|
|
&& (cframe.previous_cframe == NULL
|
|
|| ! cframe.previous_cframe->ignoring))
|
|
listing_list (2);
|
|
|
|
if (flag_mri)
|
|
mri_comment_end (stop, stopc);
|
|
|
|
demand_empty_rest_of_line ();
|
|
} /* s_if() */
|
|
|
|
/* Get a string for the MRI IFC or IFNC pseudo-ops. */
|
|
|
|
static char *
|
|
get_mri_string (terminator, len)
|
|
int terminator;
|
|
int *len;
|
|
{
|
|
char *ret;
|
|
char *s;
|
|
|
|
SKIP_WHITESPACE ();
|
|
s = ret = input_line_pointer;
|
|
if (*input_line_pointer == '\'')
|
|
{
|
|
++s;
|
|
++input_line_pointer;
|
|
while (! is_end_of_line[(unsigned char) *input_line_pointer])
|
|
{
|
|
*s++ = *input_line_pointer++;
|
|
if (s[-1] == '\'')
|
|
{
|
|
if (*input_line_pointer != '\'')
|
|
break;
|
|
++input_line_pointer;
|
|
}
|
|
}
|
|
SKIP_WHITESPACE ();
|
|
}
|
|
else
|
|
{
|
|
while (*input_line_pointer != terminator
|
|
&& ! is_end_of_line[(unsigned char) *input_line_pointer])
|
|
++input_line_pointer;
|
|
s = input_line_pointer;
|
|
while (s > ret && (s[-1] == ' ' || s[-1] == '\t'))
|
|
--s;
|
|
}
|
|
|
|
*len = s - ret;
|
|
return ret;
|
|
}
|
|
|
|
/* The MRI IFC and IFNC pseudo-ops. */
|
|
|
|
void
|
|
s_ifc (arg)
|
|
int arg;
|
|
{
|
|
char *stop = NULL;
|
|
char stopc;
|
|
char *s1, *s2;
|
|
int len1, len2;
|
|
int res;
|
|
struct conditional_frame cframe;
|
|
|
|
if (flag_mri)
|
|
stop = mri_comment_field (&stopc);
|
|
|
|
s1 = get_mri_string (',', &len1);
|
|
|
|
if (*input_line_pointer != ',')
|
|
as_bad ("bad format for ifc or ifnc");
|
|
else
|
|
++input_line_pointer;
|
|
|
|
s2 = get_mri_string (';', &len2);
|
|
|
|
res = len1 == len2 && strncmp (s1, s2, len1) == 0;
|
|
|
|
initialize_cframe (&cframe);
|
|
cframe.ignoring = cframe.dead_tree || ! (res ^ arg);
|
|
current_cframe = ((struct conditional_frame *)
|
|
obstack_copy (&cond_obstack, &cframe, sizeof (cframe)));
|
|
|
|
if (LISTING_SKIP_COND ()
|
|
&& cframe.ignoring
|
|
&& (cframe.previous_cframe == NULL
|
|
|| ! cframe.previous_cframe->ignoring))
|
|
listing_list (2);
|
|
|
|
if (flag_mri)
|
|
mri_comment_end (stop, stopc);
|
|
}
|
|
|
|
void
|
|
s_endif (arg)
|
|
int arg;
|
|
{
|
|
struct conditional_frame *hold;
|
|
|
|
if (current_cframe == NULL)
|
|
{
|
|
as_bad ("\".endif\" without \".if\"");
|
|
}
|
|
else
|
|
{
|
|
if (LISTING_SKIP_COND ()
|
|
&& current_cframe->ignoring
|
|
&& (current_cframe->previous_cframe == NULL
|
|
|| ! current_cframe->previous_cframe->ignoring))
|
|
listing_list (1);
|
|
|
|
hold = current_cframe;
|
|
current_cframe = current_cframe->previous_cframe;
|
|
obstack_free (&cond_obstack, hold);
|
|
} /* if one pop too many */
|
|
|
|
if (flag_mri)
|
|
{
|
|
while (! is_end_of_line[(unsigned char) *input_line_pointer])
|
|
++input_line_pointer;
|
|
}
|
|
|
|
demand_empty_rest_of_line ();
|
|
} /* s_endif() */
|
|
|
|
void
|
|
s_else (arg)
|
|
int arg;
|
|
{
|
|
if (current_cframe == NULL)
|
|
{
|
|
as_bad (".else without matching .if - ignored");
|
|
|
|
}
|
|
else if (current_cframe->else_seen)
|
|
{
|
|
as_bad ("duplicate \"else\" - ignored");
|
|
as_bad_where (current_cframe->else_file_line.file,
|
|
current_cframe->else_file_line.line,
|
|
"here is the previous \"else\"");
|
|
as_bad_where (current_cframe->if_file_line.file,
|
|
current_cframe->if_file_line.line,
|
|
"here is the previous \"if\"");
|
|
}
|
|
else
|
|
{
|
|
as_where (¤t_cframe->else_file_line.file,
|
|
¤t_cframe->else_file_line.line);
|
|
|
|
if (!current_cframe->dead_tree)
|
|
{
|
|
current_cframe->ignoring = !current_cframe->ignoring;
|
|
if (LISTING_SKIP_COND ()
|
|
&& ! current_cframe->ignoring)
|
|
listing_list (1);
|
|
} /* if not a dead tree */
|
|
|
|
current_cframe->else_seen = 1;
|
|
} /* if error else do it */
|
|
|
|
if (flag_mri)
|
|
{
|
|
while (! is_end_of_line[(unsigned char) *input_line_pointer])
|
|
++input_line_pointer;
|
|
}
|
|
|
|
demand_empty_rest_of_line ();
|
|
} /* s_else() */
|
|
|
|
void
|
|
s_ifeqs (arg)
|
|
int arg;
|
|
{
|
|
char *s1, *s2;
|
|
int len1, len2;
|
|
int res;
|
|
struct conditional_frame cframe;
|
|
|
|
s1 = demand_copy_C_string (&len1);
|
|
|
|
SKIP_WHITESPACE ();
|
|
if (*input_line_pointer != ',')
|
|
{
|
|
as_bad (".ifeqs syntax error");
|
|
ignore_rest_of_line ();
|
|
return;
|
|
}
|
|
|
|
++input_line_pointer;
|
|
|
|
s2 = demand_copy_C_string (&len2);
|
|
|
|
res = len1 == len2 && strncmp (s1, s2, len1) == 0;
|
|
|
|
initialize_cframe (&cframe);
|
|
cframe.ignoring = cframe.dead_tree || ! (res ^ arg);
|
|
current_cframe = ((struct conditional_frame *)
|
|
obstack_copy (&cond_obstack, &cframe, sizeof (cframe)));
|
|
|
|
if (LISTING_SKIP_COND ()
|
|
&& cframe.ignoring
|
|
&& (cframe.previous_cframe == NULL
|
|
|| ! cframe.previous_cframe->ignoring))
|
|
listing_list (2);
|
|
|
|
demand_empty_rest_of_line ();
|
|
} /* s_ifeqs() */
|
|
|
|
int
|
|
ignore_input ()
|
|
{
|
|
char *s;
|
|
|
|
s = input_line_pointer;
|
|
|
|
if (flag_m68k_mri
|
|
#ifdef NO_PSEUDO_DOT
|
|
|| 1
|
|
#endif
|
|
)
|
|
{
|
|
if (s[-1] != '.')
|
|
--s;
|
|
}
|
|
else
|
|
{
|
|
if (s[-1] != '.')
|
|
return (current_cframe != NULL) && (current_cframe->ignoring);
|
|
}
|
|
|
|
/* We cannot ignore certain pseudo ops. */
|
|
if (((s[0] == 'i'
|
|
|| s[0] == 'I')
|
|
&& (!strncasecmp (s, "if", 2)
|
|
|| !strncasecmp (s, "ifdef", 5)
|
|
|| !strncasecmp (s, "ifndef", 6)))
|
|
|| ((s[0] == 'e'
|
|
|| s[0] == 'E')
|
|
&& (!strncasecmp (s, "else", 4)
|
|
|| !strncasecmp (s, "endif", 5)
|
|
|| !strncasecmp (s, "endc", 4))))
|
|
return 0;
|
|
|
|
return (current_cframe != NULL) && (current_cframe->ignoring);
|
|
} /* ignore_input() */
|
|
|
|
static void
|
|
initialize_cframe (cframe)
|
|
struct conditional_frame *cframe;
|
|
{
|
|
memset (cframe, 0, sizeof (*cframe));
|
|
as_where (&cframe->if_file_line.file,
|
|
&cframe->if_file_line.line);
|
|
cframe->previous_cframe = current_cframe;
|
|
cframe->dead_tree = current_cframe != NULL && current_cframe->ignoring;
|
|
cframe->macro_nest = macro_nest;
|
|
}
|
|
|
|
/* Give an error if a conditional is unterminated inside a macro or
|
|
the assembly as a whole. If NEST is non negative, we are being
|
|
called because of the end of a macro expansion. If NEST is
|
|
negative, we are being called at the of the input files. */
|
|
|
|
void
|
|
cond_finish_check (nest)
|
|
int nest;
|
|
{
|
|
if (current_cframe != NULL && current_cframe->macro_nest >= nest)
|
|
{
|
|
as_bad ("end of %s inside conditional",
|
|
nest >= 0 ? "macro" : "file");
|
|
as_bad_where (current_cframe->if_file_line.file,
|
|
current_cframe->if_file_line.line,
|
|
"here is the start of the unterminated conditional");
|
|
if (current_cframe->else_seen)
|
|
as_bad_where (current_cframe->else_file_line.file,
|
|
current_cframe->else_file_line.line,
|
|
"here is the \"else\" of the unterminated conditional");
|
|
}
|
|
}
|
|
|
|
/* This function is called when we exit out of a macro. We assume
|
|
that any conditionals which began within the macro are correctly
|
|
nested, and just pop them off the stack. */
|
|
|
|
void
|
|
cond_exit_macro (nest)
|
|
int nest;
|
|
{
|
|
while (current_cframe != NULL && current_cframe->macro_nest >= nest)
|
|
{
|
|
struct conditional_frame *hold;
|
|
|
|
hold = current_cframe;
|
|
current_cframe = current_cframe->previous_cframe;
|
|
obstack_free (&cond_obstack, hold);
|
|
}
|
|
}
|
|
|
|
/* end of cond.c */
|