#include "obstack.h"
#include "subsegs.h"
+#ifdef TE_PE
+#include "coff/pe.h"
+#endif
+
/* I think this is probably always correct. */
#ifndef KEEP_RELOC_INFO
#define KEEP_RELOC_INFO
/* This is used to hold the symbol built by a sequence of pseudo-ops
from .def and .endef. */
static symbolS *def_symbol_in_progress;
+#ifdef TE_PE
+/* PE weak alternate symbols begin with this string. */
+static const char weak_altprefix[] = ".weak.";
+#endif /* TE_PE */
typedef struct
{
demand_empty_rest_of_line ();
}
+#ifdef TE_PE
+
+/* Return nonzero if name begins with weak alternate symbol prefix. */
+
+static int
+weak_is_altname (const char * name)
+{
+ return ! strncmp (name, weak_altprefix, sizeof (weak_altprefix) - 1);
+}
+
+/* Return the name of the alternate symbol
+ name corresponding to a weak symbol's name. */
+
+static const char *
+weak_name2altname (const char * name)
+{
+ char *alt_name;
+
+ alt_name = xmalloc (sizeof (weak_altprefix) + strlen (name));
+ strcpy (alt_name, weak_altprefix);
+ return strcat (alt_name, name);
+}
+
+/* Return the name of the weak symbol corresponding to an
+ alterate symbol. */
+
+static const char *
+weak_altname2name (const char * name)
+{
+ char * weak_name;
+ char * dot;
+
+ assert (weak_is_altname (name));
+
+ weak_name = xstrdup (name + 6);
+ if ((dot = strchr (weak_name, '.')))
+ *dot = 0;
+ return weak_name;
+}
+
+/* Make a weak symbol name unique by
+ appending the name of an external symbol. */
+
+static const char *
+weak_uniquify (const char * name)
+{
+ char *ret;
+ const char * unique = "";
+
+#ifdef USE_UNIQUE
+ if (an_external_name != NULL)
+ unique = an_external_name;
+#endif
+ assert (weak_is_altname (name));
+
+ if (strchr (name + sizeof (weak_altprefix), '.'))
+ return name;
+
+ ret = xmalloc (strlen (name) + strlen (unique) + 2);
+ strcpy (ret, name);
+ strcat (ret, ".");
+ strcat (ret, unique);
+ return ret;
+}
+
+#endif /* TE_PE */
+
/* Handle .weak. This is a GNU extension in formats other than PE. */
+
static void
-obj_coff_weak (ignore)
- int ignore ATTRIBUTE_UNUSED;
+obj_coff_weak (int ignore ATTRIBUTE_UNUSED)
{
char *name;
int c;
symbolS *symbolP;
+#ifdef TE_PE
+ symbolS *alternateP;
+#endif
do
{
ignore_rest_of_line ();
return;
}
+ c = 0;
symbolP = symbol_find_or_make (name);
*input_line_pointer = c;
SKIP_WHITESPACE ();
#ifdef TE_PE
/* See _Microsoft Portable Executable and Common Object
- * File Format Specification_, section 5.5.3.
- * Note that weak symbols without aux records are a GNU
- * extension.
- */
+ File Format Specification_, section 5.5.3.
+ Create a symbol representing the alternate value.
+ coff_frob_symbol will set the value of this symbol from
+ the value of the weak symbol itself. */
S_SET_STORAGE_CLASS (symbolP, C_NT_WEAK);
+ S_SET_NUMBER_AUXILIARY (symbolP, 1);
+ SA_SET_SYM_FSIZE (symbolP, IMAGE_WEAK_EXTERN_SEARCH_LIBRARY);
- if (c == '=')
- {
- symbolS *alternateP;
- long characteristics = 2;
- ++input_line_pointer;
- if (*input_line_pointer == '=')
- {
- characteristics = 1;
- ++input_line_pointer;
- }
-
- SKIP_WHITESPACE();
- name = input_line_pointer;
- c = get_symbol_end();
- if (*name == 0)
- {
- as_warn (_("alternate name missing in .weak directive"));
- ignore_rest_of_line ();
- return;
- }
- alternateP = symbol_find_or_make (name);
- *input_line_pointer = c;
+ alternateP = symbol_find_or_make (weak_name2altname (name));
+ S_SET_EXTERNAL (alternateP);
+ S_SET_STORAGE_CLASS (alternateP, C_NT_WEAK);
- S_SET_NUMBER_AUXILIARY (symbolP, 1);
- SA_SET_SYM_TAGNDX (symbolP, alternateP);
- SA_SET_SYM_FSIZE (symbolP, characteristics);
- }
-#else /* TE_PE */
- S_SET_STORAGE_CLASS (symbolP, C_WEAKEXT);
-#endif /* TE_PE */
+ SA_SET_SYM_TAGNDX (symbolP, alternateP);
+#endif
if (c == ',')
{
if (!block_stack)
block_stack = stack_init (512, sizeof (symbolS*));
- if (S_IS_WEAK (symp))
- {
#ifdef TE_PE
- S_SET_STORAGE_CLASS (symp, C_NT_WEAK);
-#else
- S_SET_STORAGE_CLASS (symp, C_WEAKEXT);
-#endif
+ if (S_GET_STORAGE_CLASS (symp) == C_NT_WEAK
+ && ! S_IS_WEAK (symp)
+ && weak_is_altname (S_GET_NAME (symp)))
+ {
+ /* This is a weak alternate symbol. All processing of
+ PECOFFweak symbols is done here, through the alternate. */
+ symbolS *weakp = symbol_find (weak_altname2name (S_GET_NAME (symp)));
+
+ assert (weakp);
+ assert (S_GET_NUMBER_AUXILIARY (weakp) == 1);
+
+ if (symbol_equated_p (weakp))
+ {
+ /* The weak symbol has an alternate specified; symp is unneeded. */
+ S_SET_STORAGE_CLASS (weakp, C_NT_WEAK);
+ SA_SET_SYM_TAGNDX (weakp,
+ symbol_get_value_expression (weakp)->X_add_symbol);
+
+ S_CLEAR_EXTERNAL (symp);
+ *punt = 1;
+ return;
+ }
+ else
+ {
+ /* The weak symbol has been assigned an alternate value.
+ Copy this value to symp, and set symp as weakp's alternate. */
+ if (S_GET_STORAGE_CLASS (weakp) != C_NT_WEAK)
+ {
+ S_SET_STORAGE_CLASS (symp, S_GET_STORAGE_CLASS (weakp));
+ S_SET_STORAGE_CLASS (weakp, C_NT_WEAK);
+ }
+
+ if (S_IS_DEFINED (weakp))
+ {
+ /* This is a defined weak symbol. Copy value information
+ from the weak symbol itself to the alternate symbol. */
+ symbol_set_value_expression (symp,
+ symbol_get_value_expression (weakp));
+ symbol_set_frag (symp, symbol_get_frag (weakp));
+ S_SET_SEGMENT (symp, S_GET_SEGMENT (weakp));
+ }
+ else
+ {
+ /* This is an undefined weak symbol.
+ Define the alternate symbol to zero. */
+ S_SET_VALUE (symp, 0);
+ S_SET_SEGMENT (symp, absolute_section);
+ }
+
+ S_SET_NAME (symp, weak_uniquify (S_GET_NAME (symp)));
+ S_SET_STORAGE_CLASS (symp, C_EXT);
+
+ S_SET_VALUE (weakp, 0);
+ S_SET_SEGMENT (weakp, undefined_section);
+ }
}
+#else /* TE_PE */
+ if (S_IS_WEAK (symp))
+ S_SET_STORAGE_CLASS (symp, C_WEAKEXT);
+#endif /* TE_PE */
if (!S_IS_DEFINED (symp)
&& !S_IS_WEAK (symp)
#include "libbfd.h"
#include "libcoff.h"
-#ifdef TE_PE
-#include "coff/pe.h"
-#endif
-
/* The NOP_OPCODE is for the alignment fill value. Fill with nop so
that we can stick sections together without causing trouble. */
#ifndef NOP_OPCODE
projects / deliverable / binutils-gdb.git / blobdiff