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Make .ifdef treat a referenced but not yet defined symbol as if it were 

undefined, in exactly the same way as .equiv.
This commit is contained in:
Nick Clifton 2002-07-19 11:35:06 +00:00
parent fb16b90083
commit 8dfa01881f
3 changed files with 59 additions and 26 deletions
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11
gas/ChangeLog
View File

@ -1,3 +1,14 @@
2002-07-19 Miroslav Tichy <tichm9am@ss1000.ms.mff.cuni.cz>
Nick Clifton <nickc@redhat.com>
* cond.c (s_ifdef): Treat a referenced but not yet defined
symbol as if it were undefined, in exactly the same way as
.equiv.
* doc/as.texinfo: Document that .ifdef, .ifndef and .equiv
consider referenced bug not yet defined symbols to be
undefined.
2002-07-18 Denis Chertykov <denisc@overta.ru>
Frank Ch. Eigler <fche@redhat.com>
Alan Lehotsky <alehotsky@cygnus.com>

58
gas/cond.c
View File

@ -60,15 +60,19 @@ static char *get_mri_string PARAMS ((int, int *));
static struct conditional_frame *current_cframe = NULL;
/* Performs the .ifdef (test_defined == 1) and
the .ifndef (test_defined == 0) pseudo op. */
void
s_ifdef (arg)
int arg;
s_ifdef (test_defined)
int test_defined;
{
/* Points to name of symbol. */
register char *name;
char *name;
/* Points to symbol. */
register symbolS *symbolP;
symbolS *symbolP;
struct conditional_frame cframe;
char c;
/* Leading whitespace is part of operand. */
SKIP_WHITESPACE ();
@ -79,29 +83,43 @@ s_ifdef (arg)
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 */
if (LISTING_SKIP_COND ()
&& cframe.ignoring
&& (cframe.previous_cframe == NULL
|| ! cframe.previous_cframe->ignoring))
listing_list (2);
demand_empty_rest_of_line ();
}
void

16
gas/doc/as.texinfo
View File

@ -241,7 +241,7 @@ code for @value{TARGET} architectures.
@cindex option summary
@cindex summary of options
Here is a brief summary of how to invoke @command{@value{AS}}. For details,
@pxref{Invoking,,Comand-Line Options}.
@pxref{Invoking,,Command-Line Options}.
@c man title AS the portable GNU assembler.
@ -686,7 +686,7 @@ Scenix IP2K series.
Specifies that the extended IP2022 instructions are allowed.
@item -mip2022
Restores the default behaviour, which restricts the permited instructions to
Restores the default behaviour, which restricts the permitted instructions to
just the basic IP2022 ones.
@end table
@ -1580,7 +1580,7 @@ dump appears on the left hand side of the listing output.
@kindex --listing-lhs-width2
@cindex Width of continuation lines of disassembly output
Sets the maximum width, in words, of any further lines of the hex byte dump for
a given inut source line. If this value is not specified, it defaults to being
a given input source line. If this value is not specified, it defaults to being
the same as the value specified for @samp{--listing-lhs-width}. If neither
switch is used the default is to one.
@ -4074,7 +4074,9 @@ The syntax for @code{equ} on the HPPA is
@section @code{.equiv @var{symbol}, @var{expression}}
@cindex @code{equiv} directive
The @code{.equiv} directive is like @code{.equ} and @code{.set}, except that
the assembler will signal an error if @var{symbol} is already defined.
the assembler will signal an error if @var{symbol} is already defined. Note a
symbol which has been referenced but not actually defined is considered to be
undefined.
Except for the contents of the error message, this is roughly equivalent to
@smallexample
@ -4273,7 +4275,8 @@ The following variants of @code{.if} are also supported:
@cindex @code{ifdef} directive
@item .ifdef @var{symbol}
Assembles the following section of code if the specified @var{symbol}
has been defined.
has been defined. Note a symbol which has been referenced but not yet defined
is considered to be undefined.
@cindex @code{ifc} directive
@item .ifc @var{string1},@var{string2}
@ -4319,7 +4322,8 @@ following section of code if the two strings are not the same.
@item .ifndef @var{symbol}
@itemx .ifnotdef @var{symbol}
Assembles the following section of code if the specified @var{symbol}
has not been defined. Both spelling variants are equivalent.
has not been defined. Both spelling variants are equivalent. Note a symbol
which has been referenced but not yet defined is considered to be undefined.
@cindex @code{ifne} directive
@item .ifne @var{absolute expression}