/* read.c - read a source file -
Copyright 1986, 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
- 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
+ 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
#include "sb.h"
#include "macro.h"
#include "obstack.h"
-#include "listing.h"
#include "ecoff.h"
#include "dw2gencfi.h"
{"xref", s_ignore, 0},
{"xstabs", s_xstab, 's'},
{"warning", s_errwarn, 0},
+ {"weakref", s_weakref, 0},
{"word", cons, 2},
{"zero", s_space, 0},
{NULL, NULL, 0} /* End sentinel. */
unsigned int new_length;
char *tmp_buf = 0;
- bump_line_counters ();
s = input_line_pointer;
if (strncmp (s, "APP\n", 4))
- continue; /* We ignore it */
+ {
+ /* We ignore it. */
+ ignore_rest_of_line ();
+ continue;
+ }
+ bump_line_counters ();
s += 4;
sb_new (&sbuf);
continue;
#endif
input_line_pointer--;
- /* Report unknown char as ignored. */
+ /* Report unknown char as error. */
demand_empty_rest_of_line ();
}
unsigned int align_limit = ALIGN_LIMIT;
unsigned int align;
char *stop = NULL;
- char stopc;
+ char stopc = 0;
offsetT fill = 0;
int max;
int fill_p;
offsetT temp, size;
symbolS *symbolP = NULL;
char *stop = NULL;
- char stopc;
+ char stopc = 0;
expressionS exp;
if (flag_mri)
*p = 0;
symbolP = symbol_find_or_make (name);
- if (S_IS_DEFINED (symbolP) && !S_IS_COMMON (symbolP))
+ if ((S_IS_DEFINED (symbolP) || symbol_equated_p (symbolP))
+ && !S_IS_COMMON (symbolP))
{
- symbolP = NULL;
- as_bad (_("symbol `%s' is already defined"), name);
- *p = c;
- ignore_rest_of_line ();
- goto out;
+ if (!S_IS_VOLATILE (symbolP))
+ {
+ symbolP = NULL;
+ as_bad (_("symbol `%s' is already defined"), name);
+ *p = c;
+ ignore_rest_of_line ();
+ goto out;
+ }
+ symbolP = symbol_clone (symbolP, 1);
+ S_SET_SEGMENT (symbolP, undefined_section);
+ S_SET_VALUE (symbolP, 0);
+ symbol_set_frag (symbolP, &zero_address_frag);
+ S_CLEAR_VOLATILE (symbolP);
}
size = S_GET_VALUE (symbolP);
{
S_SET_VALUE (symbolP, (valueT) size);
S_SET_EXTERNAL (symbolP);
+ S_SET_SEGMENT (symbolP, bfd_com_section_ptr);
#ifdef OBJ_VMS
{
extern int flag_one;
symbolS *sym;
offsetT align;
char *stop = NULL;
- char stopc;
+ char stopc = 0;
if (!flag_mri)
{
}
S_SET_EXTERNAL (sym);
+ S_SET_SEGMENT (sym, bfd_com_section_ptr);
mri_common_symbol = sym;
#ifdef S_SET_ALIGN
{
offsetT temp;
char *stop = NULL;
- char stopc;
+ char stopc = 0;
if (flag_mri)
stop = mri_comment_field (&stopc);
int c;
symbolS *symbolP;
char *stop = NULL;
- char stopc;
+ char stopc = 0;
if (flag_mri)
stop = mri_comment_field (&stopc);
*p = 0;
symbolP = symbol_find_or_make (name);
- /* FIXME-SOON I pulled a (&& symbolP->sy_other == 0 &&
- symbolP->sy_desc == 0) out of this test because coff doesn't have
- those fields, and I can't see when they'd ever be tripped. I
- don't think I understand why they were here so I may have
- introduced a bug. As recently as 1.37 didn't have this test
- anyway. xoxorich. */
-
- if (S_GET_SEGMENT (symbolP) == undefined_section
- && S_GET_VALUE (symbolP) == 0)
+ if (S_GET_SEGMENT (symbolP) == undefined_section)
{
/* The name might be an undefined .global symbol; be sure to
keep the "external" bit. */
#endif
}
- if (S_IS_DEFINED (symbolP))
+ if (S_IS_DEFINED (symbolP) || symbol_equated_p (symbolP))
{
/* Permit register names to be redefined. */
if ((mode != 0 || !S_IS_VOLATILE (symbolP))
/* If the symbol is volatile, copy the symbol and replace the
original with the copy, so that previous uses of the symbol will
retain the value of the symbol at the point of use. */
- else if (S_IS_VOLATILE (symbolP)
- /* This could be avoided when the symbol wasn't used so far, but
- the comment in struc-symbol.h says this flag isn't reliable. */
- && (1 || symbol_used_p (symbolP)))
+ else if (S_IS_VOLATILE (symbolP))
symbolP = symbol_clone (symbolP, 1);
}
expressionS val;
char *p = 0;
char *stop = NULL;
- char stopc;
+ char stopc = 0;
int bytes;
#ifdef md_flush_pending_output
int flen;
char temp[MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT];
char *stop = NULL;
- char stopc;
+ char stopc = 0;
if (flag_mri)
stop = mri_comment_field (&stopc);
s_struct (int ignore ATTRIBUTE_UNUSED)
{
char *stop = NULL;
- char stopc;
+ char stopc = 0;
if (flag_mri)
stop = mri_comment_field (&stopc);
abs_section_offset = get_absolute_expression ();
+#if defined (OBJ_ELF) || defined (OBJ_MAYBE_ELF)
+ /* The ELF backend needs to know that we are changing sections, so
+ that .previous works correctly. */
+ if (IS_ELF)
+ obj_elf_section_change_hook ();
+#endif
subseg_set (absolute_section, 0);
demand_empty_rest_of_line ();
if (flag_mri)
const_flag &= ~IN_DEFAULT_SECTION;
#endif
}
+
+/* .weakref x, y sets x as an alias to y that, as long as y is not
+ referenced directly, will cause y to become a weak symbol. */
+void
+s_weakref (int ignore ATTRIBUTE_UNUSED)
+{
+ char *name;
+ char delim;
+ char *end_name;
+ symbolS *symbolP;
+ symbolS *symbolP2;
+ expressionS exp;
+
+ name = input_line_pointer;
+ delim = get_symbol_end ();
+ end_name = input_line_pointer;
+
+ if (name == end_name)
+ {
+ as_bad (_("expected symbol name"));
+ *end_name = delim;
+ ignore_rest_of_line ();
+ return;
+ }
+
+ symbolP = symbol_find_or_make (name);
+
+ if (S_IS_DEFINED (symbolP) || symbol_equated_p (symbolP))
+ {
+ if (!S_IS_VOLATILE (symbolP))
+ {
+ as_bad (_("symbol `%s' is already defined"), name);
+ *end_name = delim;
+ ignore_rest_of_line ();
+ return;
+ }
+ symbolP = symbol_clone (symbolP, 1);
+ S_CLEAR_VOLATILE (symbolP);
+ }
+
+ *end_name = delim;
+
+ SKIP_WHITESPACE ();
+
+ if (*input_line_pointer != ',')
+ {
+ *end_name = 0;
+ as_bad (_("expected comma after \"%s\""), name);
+ *end_name = delim;
+ ignore_rest_of_line ();
+ return;
+ }
+
+ input_line_pointer++;
+
+ SKIP_WHITESPACE ();
+
+ name = input_line_pointer;
+ delim = get_symbol_end ();
+ end_name = input_line_pointer;
+
+ if (name == end_name)
+ {
+ as_bad (_("expected symbol name"));
+ ignore_rest_of_line ();
+ return;
+ }
+
+ if ((symbolP2 = symbol_find_noref (name, 1)) == NULL
+ && (symbolP2 = md_undefined_symbol (name)) == NULL)
+ {
+ symbolP2 = symbol_find_or_make (name);
+ S_SET_WEAKREFD (symbolP2);
+ }
+ else
+ {
+ symbolS *symp = symbolP2;
+
+ while (S_IS_WEAKREFR (symp) && symp != symbolP)
+ {
+ expressionS *expP = symbol_get_value_expression (symp);
+
+ assert (expP->X_op == O_symbol
+ && expP->X_add_number == 0);
+ symp = expP->X_add_symbol;
+ }
+ if (symp == symbolP)
+ {
+ char *loop;
+
+ loop = concat (S_GET_NAME (symbolP),
+ " => ", S_GET_NAME (symbolP2), NULL);
+
+ symp = symbolP2;
+ while (symp != symbolP)
+ {
+ char *old_loop = loop;
+ symp = symbol_get_value_expression (symp)->X_add_symbol;
+ loop = concat (loop, " => ", S_GET_NAME (symp), NULL);
+ free (old_loop);
+ }
+
+ as_bad (_("%s: would close weakref loop: %s"),
+ S_GET_NAME (symbolP), loop);
+
+ free (loop);
+
+ *end_name = delim;
+ ignore_rest_of_line ();
+ return;
+ }
+
+ /* Short-circuiting instead of just checking here might speed
+ things up a tiny little bit, but loop error messages would
+ miss intermediate links. */
+ /* symbolP2 = symp; */
+ }
+
+ *end_name = delim;
+
+ memset (&exp, 0, sizeof (exp));
+ exp.X_op = O_symbol;
+ exp.X_add_symbol = symbolP2;
+
+ S_SET_SEGMENT (symbolP, undefined_section);
+ symbol_set_value_expression (symbolP, &exp);
+ symbol_set_frag (symbolP, &zero_address_frag);
+ S_SET_WEAKREFR (symbolP);
+
+ demand_empty_rest_of_line ();
+}
\f
/* Verify that we are at the end of a line. If not, issue an error and
int c;
expressionS exp;
char *stop = NULL;
- char stopc;
+ char stopc = 0;
#ifdef md_flush_pending_output
md_flush_pending_output ();
equals (char *sym_name, int reassign)
{
char *stop = NULL;
- char stopc;
+ char stopc = 0;
input_line_pointer++;
if (*input_line_pointer == '=')
projects / deliverable / binutils-gdb.git / blobdiff