0,0 → 1,577 |
/* cond.c - conditional assembly pseudo-ops, and .include |
Copyright 1990, 1991, 1992, 1993, 1995, 1997, 1998, 2000, 2001, 2002, |
2003, 2005, 2006, 2007 Free Software Foundation, Inc. |
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This file is part of GAS, the GNU Assembler. |
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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 3, or (at your option) |
any later version. |
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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. |
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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, 51 Franklin Street - Fifth Floor, Boston, MA |
02110-1301, USA. */ |
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#include "as.h" |
#include "sb.h" |
#include "macro.h" |
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#include "obstack.h" |
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/* This is allocated to grow and shrink as .ifdef/.endif pairs are |
scanned. */ |
struct obstack cond_obstack; |
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struct file_line { |
char *file; |
unsigned int line; |
}; |
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/* We push one of these structures for each .if, and pop it at the |
.endif. */ |
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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. |
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; |
}; |
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static void initialize_cframe (struct conditional_frame *cframe); |
static char *get_mri_string (int, int *); |
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static struct conditional_frame *current_cframe = NULL; |
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/* Performs the .ifdef (test_defined == 1) and |
the .ifndef (test_defined == 0) pseudo op. */ |
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void |
s_ifdef (int test_defined) |
{ |
/* Points to name of symbol. */ |
char *name; |
/* Points to symbol. */ |
symbolS *symbolP; |
struct conditional_frame cframe; |
char c; |
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/* Leading whitespace is part of operand. */ |
SKIP_WHITESPACE (); |
name = input_line_pointer; |
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if (!is_name_beginner (*name)) |
{ |
as_bad (_("invalid identifier for \".ifdef\"")); |
obstack_1grow (&cond_obstack, 0); |
ignore_rest_of_line (); |
return; |
} |
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c = get_symbol_end (); |
symbolP = symbol_find (name); |
*input_line_pointer = c; |
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initialize_cframe (&cframe); |
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if (cframe.dead_tree) |
cframe.ignoring = 1; |
else |
{ |
int is_defined; |
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/* 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) || symbol_equated_p (symbolP)) |
&& S_GET_SEGMENT (symbolP) != reg_section; |
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cframe.ignoring = ! (test_defined ^ is_defined); |
} |
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current_cframe = ((struct conditional_frame *) |
obstack_copy (&cond_obstack, &cframe, |
sizeof (cframe))); |
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if (LISTING_SKIP_COND () |
&& cframe.ignoring |
&& (cframe.previous_cframe == NULL |
|| ! cframe.previous_cframe->ignoring)) |
listing_list (2); |
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demand_empty_rest_of_line (); |
} |
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void |
s_if (int arg) |
{ |
expressionS operand; |
struct conditional_frame cframe; |
int t; |
char *stop = NULL; |
char stopc; |
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if (flag_mri) |
stop = mri_comment_field (&stopc); |
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/* Leading whitespace is part of operand. */ |
SKIP_WHITESPACE (); |
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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_and_evaluate (&operand); |
if (operand.X_op != O_constant) |
as_bad (_("non-constant expression in \".if\" statement")); |
} |
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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; |
} |
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/* 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))); |
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if (LISTING_SKIP_COND () |
&& cframe.ignoring |
&& (cframe.previous_cframe == NULL |
|| ! cframe.previous_cframe->ignoring)) |
listing_list (2); |
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if (flag_mri) |
mri_comment_end (stop, stopc); |
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demand_empty_rest_of_line (); |
} |
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/* Performs the .ifb (test_blank == 1) and |
the .ifnb (test_blank == 0) pseudo op. */ |
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void |
s_ifb (int test_blank) |
{ |
struct conditional_frame cframe; |
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initialize_cframe (&cframe); |
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if (cframe.dead_tree) |
cframe.ignoring = 1; |
else |
{ |
int is_eol; |
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SKIP_WHITESPACE (); |
is_eol = is_end_of_line[(unsigned char) *input_line_pointer]; |
cframe.ignoring = (test_blank == !is_eol); |
} |
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current_cframe = ((struct conditional_frame *) |
obstack_copy (&cond_obstack, &cframe, |
sizeof (cframe))); |
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if (LISTING_SKIP_COND () |
&& cframe.ignoring |
&& (cframe.previous_cframe == NULL |
|| ! cframe.previous_cframe->ignoring)) |
listing_list (2); |
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ignore_rest_of_line (); |
} |
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/* Get a string for the MRI IFC or IFNC pseudo-ops. */ |
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static char * |
get_mri_string (int terminator, int *len) |
{ |
char *ret; |
char *s; |
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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; |
} |
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*len = s - ret; |
return ret; |
} |
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/* The MRI IFC and IFNC pseudo-ops. */ |
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void |
s_ifc (int arg) |
{ |
char *stop = NULL; |
char stopc; |
char *s1, *s2; |
int len1, len2; |
int res; |
struct conditional_frame cframe; |
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if (flag_mri) |
stop = mri_comment_field (&stopc); |
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s1 = get_mri_string (',', &len1); |
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if (*input_line_pointer != ',') |
as_bad (_("bad format for ifc or ifnc")); |
else |
++input_line_pointer; |
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s2 = get_mri_string (';', &len2); |
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res = len1 == len2 && strncmp (s1, s2, len1) == 0; |
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initialize_cframe (&cframe); |
cframe.ignoring = cframe.dead_tree || ! (res ^ arg); |
current_cframe = ((struct conditional_frame *) |
obstack_copy (&cond_obstack, &cframe, sizeof (cframe))); |
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if (LISTING_SKIP_COND () |
&& cframe.ignoring |
&& (cframe.previous_cframe == NULL |
|| ! cframe.previous_cframe->ignoring)) |
listing_list (2); |
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if (flag_mri) |
mri_comment_end (stop, stopc); |
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demand_empty_rest_of_line (); |
} |
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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); |
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current_cframe->dead_tree |= !current_cframe->ignoring; |
current_cframe->ignoring = current_cframe->dead_tree; |
} |
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if (current_cframe == NULL || current_cframe->ignoring) |
{ |
while (! is_end_of_line[(unsigned char) *input_line_pointer]) |
++input_line_pointer; |
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if (current_cframe == NULL) |
return; |
} |
else |
{ |
expressionS operand; |
int t; |
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/* Leading whitespace is part of operand. */ |
SKIP_WHITESPACE (); |
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expression_and_evaluate (&operand); |
if (operand.X_op != O_constant) |
as_bad (_("non-constant expression in \".elseif\" statement")); |
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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; |
} |
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current_cframe->ignoring = current_cframe->dead_tree || ! t; |
} |
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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); |
} |
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demand_empty_rest_of_line (); |
} |
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void |
s_endif (int arg ATTRIBUTE_UNUSED) |
{ |
struct conditional_frame *hold; |
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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); |
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hold = current_cframe; |
current_cframe = current_cframe->previous_cframe; |
obstack_free (&cond_obstack, hold); |
} /* if one pop too many */ |
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if (flag_mri) |
{ |
while (! is_end_of_line[(unsigned char) *input_line_pointer]) |
++input_line_pointer; |
} |
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demand_empty_rest_of_line (); |
} |
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void |
s_else (int arg ATTRIBUTE_UNUSED) |
{ |
if (current_cframe == NULL) |
{ |
as_bad (_("\".else\" without matching \".if\"")); |
} |
else if (current_cframe->else_seen) |
{ |
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_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); |
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current_cframe->ignoring = |
current_cframe->dead_tree | !current_cframe->ignoring; |
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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); |
} |
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current_cframe->else_seen = 1; |
} |
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if (flag_mri) |
{ |
while (! is_end_of_line[(unsigned char) *input_line_pointer]) |
++input_line_pointer; |
} |
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demand_empty_rest_of_line (); |
} |
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void |
s_ifeqs (int arg) |
{ |
char *s1, *s2; |
int len1, len2; |
int res; |
struct conditional_frame cframe; |
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s1 = demand_copy_C_string (&len1); |
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SKIP_WHITESPACE (); |
if (*input_line_pointer != ',') |
{ |
as_bad (_(".ifeqs syntax error")); |
ignore_rest_of_line (); |
return; |
} |
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++input_line_pointer; |
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s2 = demand_copy_C_string (&len2); |
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res = len1 == len2 && strncmp (s1, s2, len1) == 0; |
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initialize_cframe (&cframe); |
cframe.ignoring = cframe.dead_tree || ! (res ^ arg); |
current_cframe = ((struct conditional_frame *) |
obstack_copy (&cond_obstack, &cframe, sizeof (cframe))); |
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if (LISTING_SKIP_COND () |
&& cframe.ignoring |
&& (cframe.previous_cframe == NULL |
|| ! cframe.previous_cframe->ignoring)) |
listing_list (2); |
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demand_empty_rest_of_line (); |
} |
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int |
ignore_input (void) |
{ |
char *s; |
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s = input_line_pointer; |
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if (NO_PSEUDO_DOT || flag_m68k_mri) |
{ |
if (s[-1] != '.') |
--s; |
} |
else |
{ |
if (s[-1] != '.') |
return (current_cframe != NULL) && (current_cframe->ignoring); |
} |
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/* 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; |
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return (current_cframe != NULL) && (current_cframe->ignoring); |
} |
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static void |
initialize_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; |
} |
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/* 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. */ |
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void |
cond_finish_check (int nest) |
{ |
if (current_cframe != NULL && current_cframe->macro_nest >= nest) |
{ |
if (nest >= 0) |
as_bad (_("end of macro inside conditional")); |
else |
as_bad (_("end of file inside conditional")); |
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")); |
} |
} |
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/* 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. */ |
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void |
cond_exit_macro (int nest) |
{ |
while (current_cframe != NULL && current_cframe->macro_nest >= nest) |
{ |
struct conditional_frame *hold; |
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hold = current_cframe; |
current_cframe = current_cframe->previous_cframe; |
obstack_free (&cond_obstack, hold); |
} |
} |