/* cond.c - conditional assembly pseudo-ops, and .include
- Copyright (C) 1990, 91, 92, 93, 95, 96, 97, 98, 1999
+ Copyright 1990, 1991, 1992, 1993, 1995, 1997, 1998, 2000, 2001
Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
#include "obstack.h"
-/* This is allocated to grow and shrink as .ifdef/.endif pairs are scanned. */
+/* This is allocated to grow and shrink as .ifdef/.endif pairs are
+ scanned. */
struct obstack cond_obstack;
-struct file_line
-{
+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
-{
+struct conditional_frame {
/* The source file & line number of the "if". */
struct file_line if_file_line;
/* The source file & line of the "else". */
int else_seen;
/* Whether we are currently ignoring input. */
int ignoring;
- /* Whether a conditional at a higher level is ignoring input. */
+ /* Whether a conditional at a higher level is ignoring input.
+ Set also when a branch of an "if .. elseif .." tree has matched
+ to prevent further matches. */
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 void initialize_cframe (struct conditional_frame *cframe);
+static char *get_mri_string (int, int *);
static struct conditional_frame *current_cframe = NULL;
-void
-s_ifdef (arg)
- int arg;
+/* Performs the .ifdef (test_defined == 1) and
+ the .ifndef (test_defined == 0) pseudo op. */
+
+void
+s_ifdef (int test_defined)
{
- register char *name; /* points to name of symbol */
- register symbolS *symbolP; /* Points to symbol */
+ /* Points to name of symbol. */
+ char *name;
+ /* Points to symbol. */
+ symbolS *symbolP;
struct conditional_frame cframe;
+ char c;
- SKIP_WHITESPACE (); /* Leading whitespace is part of operand. */
+ /* Leading whitespace is part of operand. */
+ SKIP_WHITESPACE ();
name = input_line_pointer;
if (!is_name_beginner (*name))
as_bad (_("invalid identifier for \".ifdef\""));
obstack_1grow (&cond_obstack, 0);
ignore_rest_of_line ();
+ return;
}
+
+ c = get_symbol_end ();
+ symbolP = symbol_find (name);
+ *input_line_pointer = c;
+
+ initialize_cframe (&cframe);
+
+ if (cframe.dead_tree)
+ cframe.ignoring = 1;
else
{
- char c;
+ int is_defined;
- c = get_symbol_end ();
- symbolP = symbol_find (name);
- *input_line_pointer = c;
+ /* Use the same definition of 'defined' as .equiv so that a symbol
+ which has been referenced but not yet given a value/address is
+ considered to be undefined. */
+ is_defined =
+ symbolP != NULL
+ && S_IS_DEFINED (symbolP)
+ && S_GET_SEGMENT (symbolP) != reg_section;
- initialize_cframe (&cframe);
- cframe.ignoring = cframe.dead_tree || !((symbolP != 0) ^ arg);
- current_cframe = ((struct conditional_frame *)
- obstack_copy (&cond_obstack, &cframe,
- sizeof (cframe)));
+ cframe.ignoring = ! (test_defined ^ is_defined);
+ }
- if (LISTING_SKIP_COND ()
- && cframe.ignoring
- && (cframe.previous_cframe == NULL
- || ! cframe.previous_cframe->ignoring))
- listing_list (2);
+ current_cframe = ((struct conditional_frame *)
+ obstack_copy (&cond_obstack, &cframe,
+ sizeof (cframe)));
- demand_empty_rest_of_line ();
- } /* if a valid identifyer name */
-} /* s_ifdef() */
+ if (LISTING_SKIP_COND ()
+ && cframe.ignoring
+ && (cframe.previous_cframe == NULL
+ || ! cframe.previous_cframe->ignoring))
+ listing_list (2);
-void
-s_if (arg)
- int arg;
+ demand_empty_rest_of_line ();
+}
+
+void
+s_if (int arg)
{
expressionS operand;
struct conditional_frame cframe;
if (flag_mri)
stop = mri_comment_field (&stopc);
- SKIP_WHITESPACE (); /* Leading whitespace is part of operand. */
+ /* Leading whitespace is part of operand. */
+ SKIP_WHITESPACE ();
if (current_cframe != NULL && current_cframe->ignoring)
{
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;
+get_mri_string (int terminator, int *len)
{
char *ret;
char *s;
/* The MRI IFC and IFNC pseudo-ops. */
void
-s_ifc (arg)
- int arg;
+s_ifc (int arg)
{
char *stop = NULL;
char stopc;
demand_empty_rest_of_line ();
}
-void
-s_endif (arg)
- int arg ATTRIBUTE_UNUSED;
+void
+s_elseif (int arg)
+{
+ if (current_cframe == NULL)
+ {
+ as_bad (_("\".elseif\" without matching \".if\""));
+ }
+ else if (current_cframe->else_seen)
+ {
+ as_bad (_("\".elseif\" after \".else\""));
+ 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);
+
+ current_cframe->dead_tree |= !current_cframe->ignoring;
+ current_cframe->ignoring = current_cframe->dead_tree;
+ }
+
+ if (current_cframe == NULL || current_cframe->ignoring)
+ {
+ while (! is_end_of_line[(unsigned char) *input_line_pointer])
+ ++input_line_pointer;
+
+ if (current_cframe == NULL)
+ return;
+ }
+ else
+ {
+ expressionS operand;
+ int t;
+
+ /* Leading whitespace is part of operand. */
+ SKIP_WHITESPACE ();
+
+ expression (&operand);
+ if (operand.X_op != O_constant)
+ as_bad (_("non-constant expression in \".elseif\" 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 ();
+ return;
+ }
+
+ current_cframe->ignoring = current_cframe->dead_tree || ! t;
+ }
+
+ if (LISTING_SKIP_COND ()
+ && (current_cframe->previous_cframe == NULL
+ || ! current_cframe->previous_cframe->ignoring))
+ {
+ if (! current_cframe->ignoring)
+ listing_list (1);
+ else
+ listing_list (2);
+ }
+
+ demand_empty_rest_of_line ();
+}
+
+void
+s_endif (int arg ATTRIBUTE_UNUSED)
{
struct conditional_frame *hold;
}
demand_empty_rest_of_line ();
-} /* s_endif() */
+}
-void
-s_else (arg)
- int arg ATTRIBUTE_UNUSED;
+void
+s_else (int arg ATTRIBUTE_UNUSED)
{
if (current_cframe == NULL)
{
- as_bad (_(".else without matching .if - ignored"));
-
+ as_bad (_("\".else\" without matching \".if\""));
}
else if (current_cframe->else_seen)
{
- as_bad (_("duplicate \"else\" - ignored"));
+ as_bad (_("duplicate \"else\""));
as_bad_where (current_cframe->else_file_line.file,
current_cframe->else_file_line.line,
_("here is the previous \"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->dead_tree | !current_cframe->ignoring;
+
+ if (LISTING_SKIP_COND ()
+ && (current_cframe->previous_cframe == NULL
+ || ! current_cframe->previous_cframe->ignoring))
{
- current_cframe->ignoring = !current_cframe->ignoring;
- if (LISTING_SKIP_COND ())
- {
- if (! current_cframe->ignoring)
- listing_list (1);
- else
- listing_list (2);
- }
- } /* if not a dead tree */
+ if (! current_cframe->ignoring)
+ listing_list (1);
+ else
+ listing_list (2);
+ }
current_cframe->else_seen = 1;
- } /* if error else do it */
+ }
if (flag_mri)
{
}
demand_empty_rest_of_line ();
-} /* s_else() */
+}
-void
-s_ifeqs (arg)
- int arg;
+void
+s_ifeqs (int arg)
{
char *s1, *s2;
int len1, len2;
listing_list (2);
demand_empty_rest_of_line ();
-} /* s_ifeqs() */
+}
-int
-ignore_input ()
+int
+ignore_input (void)
{
char *s;
s = input_line_pointer;
- if (flag_m68k_mri
-#ifdef NO_PSEUDO_DOT
- || 1
-#endif
- )
+ if (NO_PSEUDO_DOT || flag_m68k_mri)
{
if (s[-1] != '.')
--s;
return 0;
return (current_cframe != NULL) && (current_cframe->ignoring);
-} /* ignore_input() */
+}
-static void
-initialize_cframe (cframe)
- struct conditional_frame *cframe;
+static void
+initialize_cframe (struct conditional_frame *cframe)
{
memset (cframe, 0, sizeof (*cframe));
as_where (&cframe->if_file_line.file,
negative, we are being called at the of the input files. */
void
-cond_finish_check (nest)
- int nest;
+cond_finish_check (int nest)
{
if (current_cframe != NULL && current_cframe->macro_nest >= nest)
{
nested, and just pop them off the stack. */
void
-cond_exit_macro (nest)
- int nest;
+cond_exit_macro (int nest)
{
while (current_cframe != NULL && current_cframe->macro_nest >= nest)
{
obstack_free (&cond_obstack, hold);
}
}
-
-/* end of cond.c */
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