/* symbols.c -symbol table-
Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001
+ 1999, 2000, 2001, 2002
Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
/* #define DEBUG_SYMS / * to debug symbol list maintenance. */
-#include <ctype.h>
-
#include "as.h"
+#include "safe-ctype.h"
#include "obstack.h" /* For "symbols.h" */
#include "subsegs.h"
struct obstack notes;
+static char *save_symbol_name PARAMS ((const char *));
static void fb_label_init PARAMS ((void));
static long dollar_label_instance PARAMS ((long));
static long fb_label_instance PARAMS ((long));
static void print_binary PARAMS ((FILE *, const char *, expressionS *));
+static void report_op_error PARAMS ((symbolS *, symbolS *, symbolS *));
/* Return a pointer to a new symbol. Die if we can't make a new
symbol. Fill in the symbol's values. Add symbol to end of symbol
if (! symbols_case_sensitive)
{
- unsigned char *s;
+ char *s;
- for (s = (unsigned char *) ret; *s != '\0'; s++)
- if (islower (*s))
- *s = toupper (*s);
+ for (s = ret; *s != '\0'; s++)
+ *s = TOUPPER (*s);
}
return ret;
/* Create a local symbol and insert it into the local hash table. */
static struct local_symbol *
-local_symbol_make (name, section, offset, frag)
+local_symbol_make (name, section, value, frag)
const char *name;
segT section;
- valueT offset;
+ valueT value;
fragS *frag;
{
char *name_copy;
ret->lsy_name = name_copy;
ret->lsy_section = section;
local_symbol_set_frag (ret, frag);
- ret->lsy_offset = offset;
+ ret->lsy_value = value;
hash_jam (local_hash, name_copy, (PTR) ret);
++local_symbol_conversion_count;
- ret = symbol_new (locsym->lsy_name, locsym->lsy_section, locsym->lsy_offset,
+ ret = symbol_new (locsym->lsy_name, locsym->lsy_section, locsym->lsy_value,
local_symbol_get_frag (locsym));
if (local_symbol_resolved_p (locsym))
extern const int md_short_jump_size;
extern const int md_long_jump_size;
+
+ if (now_seg == absolute_section)
+ {
+ as_bad (_("cannot define symbol `%s' in absolute section"), sym_name);
+ return NULL;
+ }
+
possible_bytes = (md_short_jump_size
+ new_broken_words * md_long_jump_size);
if (locsym->lsy_section != undefined_section
&& (local_symbol_get_frag (locsym) != frag_now
|| locsym->lsy_section != now_seg
- || locsym->lsy_offset != frag_now_fix ()))
+ || locsym->lsy_value != frag_now_fix ()))
{
- as_bad (_("Symbol %s already defined."), sym_name);
+ as_bad (_("symbol `%s' is already defined"), sym_name);
return symbolP;
}
locsym->lsy_section = now_seg;
local_symbol_set_frag (locsym, frag_now);
- locsym->lsy_offset = frag_now_fix ();
+ locsym->lsy_value = frag_now_fix ();
#endif
}
else if (!S_IS_DEFINED (symbolP) || S_IS_COMMON (symbolP))
#ifdef BFD_ASSEMBLER
if (OUTPUT_FLAVOR == bfd_target_aout_flavour)
#endif
- sprintf(od_buf, "%d.%d.",
- S_GET_OTHER (symbolP),
- S_GET_DESC (symbolP));
+ sprintf (od_buf, "%d.%d.",
+ S_GET_OTHER (symbolP),
+ S_GET_DESC (symbolP));
#endif
- as_bad (_("Symbol \"%s\" is already defined as \"%s\"/%s%ld."),
+ as_bad (_("symbol `%s' is already defined as \"%s\"/%s%ld"),
sym_name,
segment_name (S_GET_SEGMENT (symbolP)),
od_buf,
if (!(frag_now == symbolP->sy_frag
&& S_GET_VALUE (symbolP) == frag_now_fix ()
&& S_GET_SEGMENT (symbolP) == now_seg))
- as_bad (_("Symbol %s already defined."), sym_name);
+ as_bad (_("symbol `%s' is already defined"), sym_name);
}
}
error_string = hash_jam (local_hash, S_GET_NAME (symbolP),
(PTR) symbolP);
if (error_string != NULL)
- as_fatal (_("Inserting \"%s\" into symbol table failed: %s"),
+ as_fatal (_("inserting \"%s\" into symbol table failed: %s"),
S_GET_NAME (symbolP), error_string);
return;
}
if ((error_string = hash_jam (sy_hash, S_GET_NAME (symbolP), (PTR) symbolP)))
{
- as_fatal (_("Inserting \"%s\" into symbol table failed: %s"),
+ as_fatal (_("inserting \"%s\" into symbol table failed: %s"),
S_GET_NAME (symbolP), error_string);
} /* on error */
}
symbolS *
symbol_make (name)
- CONST char *name;
+ const char *name;
{
symbolS *symbolP;
symbolS *
symbol_find (name)
- CONST char *name;
+ const char *name;
{
#ifdef STRIP_UNDERSCORE
return (symbol_find_base (name, 1));
#endif /* STRIP_UNDERSCORE */
}
+symbolS *
+symbol_find_exact (name)
+ const char *name;
+{
+#ifdef BFD_ASSEMBLER
+ {
+ struct local_symbol *locsym;
+
+ locsym = (struct local_symbol *) hash_find (local_hash, name);
+ if (locsym != NULL)
+ return (symbolS *) locsym;
+ }
+#endif
+
+ return ((symbolS *) hash_find (sy_hash, name));
+}
+
symbolS *
symbol_find_base (name, strip_underscore)
- CONST char *name;
+ const char *name;
int strip_underscore;
{
if (strip_underscore && *name == '_')
while ((c = *orig++) != '\0')
{
- if (islower (c))
- c = toupper (c);
- *copy++ = c;
+ *copy++ = TOUPPER (c);
}
*copy = '\0';
}
-#ifdef BFD_ASSEMBLER
- {
- struct local_symbol *locsym;
-
- locsym = (struct local_symbol *) hash_find (local_hash, name);
- if (locsym != NULL)
- return (symbolS *) locsym;
- }
-#endif
-
- return ((symbolS *) hash_find (sy_hash, name));
+ return symbol_find_exact (name);
}
/* Once upon a time, symbols were kept in a singly linked list. At
verify_symbol_chain (p, n);
}
+static void
+report_op_error (symp, left, right)
+ symbolS *symp;
+ symbolS *left, *right;
+{
+ char *file;
+ unsigned int line;
+ segT seg_left = S_GET_SEGMENT (left);
+ segT seg_right = right ? S_GET_SEGMENT (right) : 0;
+
+ if (expr_symbol_where (symp, &file, &line))
+ {
+ if (seg_left == undefined_section)
+ as_bad_where (file, line,
+ _("undefined symbol `%s' in operation"),
+ S_GET_NAME (left));
+ if (seg_right == undefined_section)
+ as_bad_where (file, line,
+ _("undefined symbol `%s' in operation"),
+ S_GET_NAME (right));
+ if (seg_left != undefined_section
+ && seg_right != undefined_section)
+ {
+ if (right)
+ as_bad_where (file, line,
+ _("invalid sections for operation on `%s' and `%s'"),
+ S_GET_NAME (left), S_GET_NAME (right));
+ else
+ as_bad_where (file, line,
+ _("invalid section for operation on `%s'"),
+ S_GET_NAME (left));
+ }
+
+ }
+ else
+ {
+ if (seg_left == undefined_section)
+ as_bad (_("undefined symbol `%s' in operation setting `%s'"),
+ S_GET_NAME (left), S_GET_NAME (symp));
+ if (seg_right == undefined_section)
+ as_bad (_("undefined symbol `%s' in operation setting `%s'"),
+ S_GET_NAME (right), S_GET_NAME (symp));
+ if (seg_left != undefined_section
+ && seg_right != undefined_section)
+ {
+ if (right)
+ as_bad_where (file, line,
+ _("invalid sections for operation on `%s' and `%s' setting `%s'"),
+ S_GET_NAME (left), S_GET_NAME (right), S_GET_NAME (symp));
+ else
+ as_bad_where (file, line,
+ _("invalid section for operation on `%s' setting `%s'"),
+ S_GET_NAME (left), S_GET_NAME (symp));
+ }
+ }
+}
+
/* Resolve the value of a symbol. This is called during the final
pass over the symbol table to resolve any symbols with complex
values. */
symbolS *symp;
{
int resolved;
- valueT final_val;
+ valueT final_val = 0;
segT final_seg;
#ifdef BFD_ASSEMBLER
{
struct local_symbol *locsym = (struct local_symbol *) symp;
+ final_val = locsym->lsy_value;
if (local_symbol_resolved_p (locsym))
- return locsym->lsy_offset / bfd_octets_per_byte (stdoutput);
+ return final_val;
- final_val = (local_symbol_get_frag (locsym)->fr_address
- + locsym->lsy_offset) / bfd_octets_per_byte (stdoutput);
+ final_val += local_symbol_get_frag (locsym)->fr_address / OCTETS_PER_BYTE;
if (finalize_syms)
{
- locsym->lsy_offset = final_val;
+ locsym->lsy_value = final_val;
local_symbol_mark_resolved (locsym);
}
if (symp->sy_resolving)
{
if (finalize_syms)
- as_bad (_("Symbol definition loop encountered at %s"),
+ as_bad (_("symbol definition loop encountered at `%s'"),
S_GET_NAME (symp));
final_val = 0;
resolved = 1;
case O_symbol:
case O_symbol_rva:
left = resolve_symbol_value (add_symbol);
- do_symbol:
+ seg_left = S_GET_SEGMENT (add_symbol);
+ if (finalize_syms)
+ symp->sy_value.X_op_symbol = NULL;
+ do_symbol:
if (symp->sy_mri_common)
{
/* This is a symbol inside an MRI common section. The
- relocation routines are going to handle it specially.
- Don't change the value. */
+ relocation routines are going to handle it specially.
+ Don't change the value. */
resolved = symbol_resolved_p (add_symbol);
break;
}
copy_symbol_attributes (symp, add_symbol);
}
- /* If we have equated this symbol to an undefined symbol, we
- keep X_op set to O_symbol, and we don't change
- X_add_number. This permits the routine which writes out
- relocation to detect this case, and convert the
- relocation to be against the symbol to which this symbol
- is equated. */
+ /* If we have equated this symbol to an undefined or common
+ symbol, keep X_op set to O_symbol, and don't change
+ X_add_number. This permits the routine which writes out
+ relocation to detect this case, and convert the
+ relocation to be against the symbol to which this symbol
+ is equated. */
if (! S_IS_DEFINED (add_symbol) || S_IS_COMMON (add_symbol))
{
if (finalize_syms)
{
- final_seg = S_GET_SEGMENT (add_symbol);
symp->sy_value.X_op = O_symbol;
symp->sy_value.X_add_symbol = add_symbol;
symp->sy_value.X_add_number = final_val;
+ /* Use X_op_symbol as a flag. */
+ symp->sy_value.X_op_symbol = add_symbol;
+ final_seg = seg_left;
}
final_val = 0;
resolved = symbol_resolved_p (add_symbol);
symp->sy_resolving = 0;
goto exit_dont_set_value;
}
+ else if (finalize_syms && final_seg == expr_section
+ && seg_left != expr_section)
+ {
+ /* If the symbol is an expression symbol, do similarly
+ as for undefined and common syms above. Handles
+ "sym +/- expr" where "expr" cannot be evaluated
+ immediately, and we want relocations to be against
+ "sym", eg. because it is weak. */
+ symp->sy_value.X_op = O_symbol;
+ symp->sy_value.X_add_symbol = add_symbol;
+ symp->sy_value.X_add_number = final_val;
+ symp->sy_value.X_op_symbol = add_symbol;
+ final_seg = seg_left;
+ final_val += symp->sy_frag->fr_address + left;
+ resolved = symbol_resolved_p (add_symbol);
+ symp->sy_resolving = 0;
+ goto exit_dont_set_value;
+ }
else
{
final_val += symp->sy_frag->fr_address + left;
if (final_seg == expr_section || final_seg == undefined_section)
- final_seg = S_GET_SEGMENT (add_symbol);
+ final_seg = seg_left;
}
resolved = symbol_resolved_p (add_symbol);
case O_bit_not:
case O_logical_not:
left = resolve_symbol_value (add_symbol);
+ seg_left = S_GET_SEGMENT (add_symbol);
+ /* By reducing these to the relevant dyadic operator, we get
+ !S -> S == 0 permitted on anything,
+ -S -> 0 - S only permitted on absolute
+ ~S -> S ^ ~0 only permitted on absolute */
+ if (op != O_logical_not && seg_left != absolute_section
+ && finalize_syms)
+ report_op_error (symp, add_symbol, NULL);
+
+ if (final_seg == expr_section || final_seg == undefined_section)
+ final_seg = absolute_section;
+
if (op == O_uminus)
left = -left;
else if (op == O_logical_not)
left = ~left;
final_val += left + symp->sy_frag->fr_address;
- if (final_seg == expr_section || final_seg == undefined_section)
- final_seg = absolute_section;
resolved = symbol_resolved_p (add_symbol);
break;
/* Simplify addition or subtraction of a constant by folding the
constant into X_add_number. */
- if (op == O_add || op == O_subtract)
+ if (op == O_add)
{
if (seg_right == absolute_section)
{
- if (op == O_add)
- final_val += right;
- else
- final_val -= right;
- op = O_symbol;
- op_symbol = NULL;
+ final_val += right;
goto do_symbol;
}
- else if (seg_left == absolute_section && op == O_add)
+ else if (seg_left == absolute_section)
{
- op = O_symbol;
final_val += left;
add_symbol = op_symbol;
left = right;
- op_symbol = NULL;
+ seg_left = seg_right;
goto do_symbol;
}
}
-
- /* Subtraction is permitted if both operands are in the same
- section. Otherwise, both operands must be absolute. We
- already handled the case of addition or subtraction of a
- constant above. This will probably need to be changed
- for an object file format which supports arbitrary
- expressions, such as IEEE-695. */
- /* Don't emit messages unless we're finalizing the symbol value,
- otherwise we may get the same message multiple times. */
- if ((seg_left != absolute_section
- || seg_right != absolute_section)
- && (op != O_subtract
- || seg_left != seg_right
- || seg_left == undefined_section)
- && finalize_syms)
+ else if (op == O_subtract)
{
- char *file;
- unsigned int line;
-
- if (expr_symbol_where (symp, &file, &line))
- {
- if (seg_left == undefined_section)
- as_bad_where (file, line,
- _("undefined symbol %s in operation"),
- S_GET_NAME (symp->sy_value.X_add_symbol));
- if (seg_right == undefined_section)
- as_bad_where (file, line,
- _("undefined symbol %s in operation"),
- S_GET_NAME (symp->sy_value.X_op_symbol));
- if (seg_left != undefined_section
- && seg_right != undefined_section)
- as_bad_where (file, line,
- _("invalid section for operation"));
- }
- else
+ if (seg_right == absolute_section)
{
- if (seg_left == undefined_section)
- as_bad (_("undefined symbol %s in operation setting %s"),
- S_GET_NAME (symp->sy_value.X_add_symbol),
- S_GET_NAME (symp));
- if (seg_right == undefined_section)
- as_bad (_("undefined symbol %s in operation setting %s"),
- S_GET_NAME (symp->sy_value.X_op_symbol),
- S_GET_NAME (symp));
- if (seg_left != undefined_section
- && seg_right != undefined_section)
- as_bad (_("invalid section for operation setting %s"),
- S_GET_NAME (symp));
+ final_val -= right;
+ goto do_symbol;
}
}
+ /* Equality and non-equality tests are permitted on anything.
+ Subtraction, and other comparison operators are permitted if
+ both operands are in the same section. Otherwise, both
+ operands must be absolute. We already handled the case of
+ addition or subtraction of a constant above. This will
+ probably need to be changed for an object file format which
+ supports arbitrary expressions, such as IEEE-695.
+
+ Don't emit messages unless we're finalizing the symbol value,
+ otherwise we may get the same message multiple times. */
+ if (finalize_syms
+ && !(seg_left == absolute_section
+ && seg_right == absolute_section)
+ && !(op == O_eq || op == O_ne)
+ && !((op == O_subtract
+ || op == O_lt || op == O_le || op == O_ge || op == O_gt)
+ && seg_left == seg_right
+ && (seg_left != undefined_section
+ || add_symbol == op_symbol)))
+ report_op_error (symp, add_symbol, op_symbol);
+
+ if (final_seg == expr_section || final_seg == undefined_section)
+ final_seg = absolute_section;
+
/* Check for division by zero. */
if ((op == O_divide || op == O_modulus) && right == 0)
{
/* If seg_right is not absolute_section, then we've
- already issued a warning about using a bad symbol. */
+ already issued a warning about using a bad symbol. */
if (seg_right == absolute_section && finalize_syms)
{
char *file;
if (expr_symbol_where (symp, &file, &line))
as_bad_where (file, line, _("division by zero"));
else
- as_bad (_("division by zero when setting %s"),
+ as_bad (_("division by zero when setting `%s'"),
S_GET_NAME (symp));
}
case O_bit_and: left &= right; break;
case O_add: left += right; break;
case O_subtract: left -= right; break;
- case O_eq: left = left == right ? ~ (offsetT) 0 : 0; break;
- case O_ne: left = left != right ? ~ (offsetT) 0 : 0; break;
+ case O_eq:
+ case O_ne:
+ left = (left == right && seg_left == seg_right
+ && (seg_left != undefined_section
+ || add_symbol == op_symbol)
+ ? ~ (offsetT) 0 : 0);
+ if (symp->sy_value.X_op == O_ne)
+ left = ~left;
+ break;
case O_lt: left = left < right ? ~ (offsetT) 0 : 0; break;
case O_le: left = left <= right ? ~ (offsetT) 0 : 0; break;
case O_ge: left = left >= right ? ~ (offsetT) 0 : 0; break;
final_val += symp->sy_frag->fr_address + left;
if (final_seg == expr_section || final_seg == undefined_section)
- final_seg = absolute_section;
+ {
+ if (seg_left == undefined_section
+ || seg_right == undefined_section)
+ final_seg = undefined_section;
+ else if (seg_left == absolute_section)
+ final_seg = seg_right;
+ else
+ final_seg = seg_left;
+ }
resolved = (symbol_resolved_p (add_symbol)
&& symbol_resolved_p (op_symbol));
break;
symp->sy_resolved = 1;
else if (S_GET_SEGMENT (symp) != expr_section)
{
- as_bad (_("can't resolve value for symbol \"%s\""),
+ as_bad (_("can't resolve value for symbol `%s'"),
S_GET_NAME (symp));
symp->sy_resolved = 1;
}
if (s[index] != 'L')
return s;
- for (label_number = 0, p = s + index + 1; isdigit ((unsigned char) *p); ++p)
+ for (label_number = 0, p = s + index + 1; ISDIGIT (*p); ++p)
label_number = (10 * label_number) + *p - '0';
if (*p == DOLLAR_LABEL_CHAR)
else
return s;
- for (instance_number = 0, p++; isdigit ((unsigned char) *p); ++p)
+ for (instance_number = 0, p++; ISDIGIT (*p); ++p)
instance_number = (10 * instance_number) + *p - '0';
message_format = _("\"%d\" (instance number %d of a %s label)");
{
#ifdef BFD_ASSEMBLER
if (LOCAL_SYMBOL_CHECK (s))
- return ((struct local_symbol *) s)->lsy_offset;
+ return resolve_symbol_value (s);
#endif
- if (!s->sy_resolved && s->sy_value.X_op != O_constant)
+ if (!s->sy_resolved)
{
valueT val = resolve_symbol_value (s);
if (!finalize_syms)
if (! s->sy_resolved
|| s->sy_value.X_op != O_symbol
|| (S_IS_DEFINED (s) && ! S_IS_COMMON (s)))
- as_bad (_("Attempt to get value of unresolved symbol %s"),
+ as_bad (_("attempt to get value of unresolved symbol `%s'"),
S_GET_NAME (s));
recur = NULL;
}
#ifdef BFD_ASSEMBLER
if (LOCAL_SYMBOL_CHECK (s))
{
- ((struct local_symbol *) s)->lsy_offset = val;
+ ((struct local_symbol *) s)->lsy_value = val;
return;
}
#endif
return s->bsym->section != undefined_section;
}
+
+#ifndef EXTERN_FORCE_RELOC
+#define EXTERN_FORCE_RELOC IS_ELF
+#endif
+
+/* Return true for symbols that should not be reduced to section
+ symbols or eliminated from expressions, because they may be
+ overridden by the linker. */
+int
+S_FORCE_RELOC (s)
+ symbolS *s;
+{
+ if (LOCAL_SYMBOL_CHECK (s))
+ return ((struct local_symbol *) s)->lsy_section == undefined_section;
+
+ return ((s->bsym->flags & BSF_WEAK) != 0
+ || (EXTERN_FORCE_RELOC
+ && (s->bsym->flags & BSF_GLOBAL) != 0)
+ || s->bsym->section == undefined_section
+ || bfd_is_com_section (s->bsym->section));
+}
+
int
S_IS_DEBUG (s)
symbolS *s;
return S_GET_NAME (s) == 0;
}
-CONST char *
+const char *
S_GET_NAME (s)
symbolS *s;
{
{
char * file;
unsigned int line;
-
+
/* Do not reassign section symbols. */
as_where (& file, & line);
as_warn_where (file, line,
- _("Section symbols are already global"));
+ _("section symbols are already global"));
return;
}
s->bsym->flags |= BSF_GLOBAL;
s->bsym->flags &= ~(BSF_GLOBAL | BSF_LOCAL);
}
+void
+S_SET_THREAD_LOCAL (s)
+ symbolS *s;
+{
+ if (LOCAL_SYMBOL_CHECK (s))
+ s = local_symbol_convert ((struct local_symbol *) s);
+ if (bfd_is_com_section (s->bsym->section)
+ && (s->bsym->flags & BSF_THREAD_LOCAL) != 0)
+ return;
+ s->bsym->flags |= BSF_THREAD_LOCAL;
+ if ((s->bsym->flags & BSF_FUNCTION) != 0)
+ as_bad (_("Accessing function `%s' as thread-local object"),
+ S_GET_NAME (s));
+ else if (! bfd_is_und_section (s->bsym->section)
+ && (s->bsym->section->flags & SEC_THREAD_LOCAL) == 0)
+ as_bad (_("Accessing `%s' as thread-local object"),
+ S_GET_NAME (s));
+}
+
void
S_SET_NAME (s, name)
symbolS *s;
return s->sy_value.X_op == O_symbol;
}
+/* Return whether a symbol is equated to another symbol, and should be
+ treated specially when writing out relocs. */
+
+int
+symbol_equated_reloc_p (s)
+ symbolS *s;
+{
+ if (LOCAL_SYMBOL_CHECK (s))
+ return 0;
+ /* X_op_symbol, normally not used for O_symbol, is set by
+ resolve_symbol_value to flag expression syms that have been
+ equated. */
+ return (s->sy_value.X_op == O_symbol
+ && ((s->sy_resolved && s->sy_value.X_op_symbol != NULL)
+ || ! S_IS_DEFINED (s)
+ || S_IS_COMMON (s)));
+}
+
/* Return whether a symbol has a constant value. */
int
segT s = S_GET_SEGMENT (sym);
if (s != undefined_section
- && s != expr_section)
+ && s != expr_section)
fprintf (file, " %lx", (long) S_GET_VALUE (sym));
}
else if (indent_level < max_indent_level
#ifdef BFD_ASSEMBLER
if (LOCAL_SYMBOL_CHECK (sym))
fprintf (file, "constant %lx",
- (long) ((struct local_symbol *) sym)->lsy_offset);
+ (long) ((struct local_symbol *) sym)->lsy_value);
else
#endif
print_expr_1 (file, &sym->sy_value);
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