/* GDB routines for manipulating the minimal symbol tables.
- Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
- 2002, 2003, 2004, 2007, 2008, 2009, 2010, 2011
- Free Software Foundation, Inc.
+ Copyright (C) 1992-2004, 2007-2012 Free Software Foundation, Inc.
Contributed by Cygnus Support, using pieces from other GDB modules.
This file is part of GDB.
Even when a file contains enough debugging information to build a full
symbol table, these minimal symbols are still useful for quickly mapping
between names and addresses, and vice versa. They are also sometimes used
- to figure out what full symbol table entries need to be read in. */
+ to figure out what full symbol table entries need to be read in. */
#include "defs.h"
#include "gdb_string.h"
#include "symtab.h"
#include "bfd.h"
+#include "filenames.h"
#include "symfile.h"
#include "objfiles.h"
#include "demangle.h"
static int msym_count;
-/* Compute a hash code based using the same criteria as `strcmp_iw'. */
+/* See minsyms.h. */
unsigned int
msymbol_hash_iw (const char *string)
++string;
if (*string && *string != '(')
{
- hash = hash * 67 + *string - 113;
+ hash = SYMBOL_HASH_NEXT (hash, *string);
++string;
}
}
return hash;
}
-/* Compute a hash code for a string. */
+/* See minsyms.h. */
unsigned int
msymbol_hash (const char *string)
unsigned int hash = 0;
for (; *string; ++string)
- hash = hash * 67 + *string - 113;
+ hash = SYMBOL_HASH_NEXT (hash, *string);
return hash;
}
/* Add the minimal symbol SYM to an objfile's minsym hash table, TABLE. */
-void
+static void
add_minsym_to_hash_table (struct minimal_symbol *sym,
struct minimal_symbol **table)
{
{
if (sym->demangled_hash_next == NULL)
{
- unsigned int hash
- = msymbol_hash_iw (SYMBOL_SEARCH_NAME (sym)) % MINIMAL_SYMBOL_HASH_SIZE;
+ unsigned int hash = msymbol_hash_iw (SYMBOL_SEARCH_NAME (sym))
+ % MINIMAL_SYMBOL_HASH_SIZE;
sym->demangled_hash_next = table[hash];
table[hash] = sym;
}
}
+/* See minsyms.h. */
-/* Return OBJFILE where minimal symbol SYM is defined. */
struct objfile *
msymbol_objfile (struct minimal_symbol *sym)
{
const char *modified_name;
if (sfile != NULL)
- {
- char *p = strrchr (sfile, '/');
+ sfile = lbasename (sfile);
- if (p != NULL)
- sfile = p + 1;
- }
-
- /* For C++, canonicalize the input name. */
+ /* For C++, canonicalize the input name. */
modified_name = name;
if (current_language->la_language == language_cplus)
{
if (pass == 1)
{
- match = strcmp (SYMBOL_LINKAGE_NAME (msymbol),
- modified_name) == 0;
+ int (*cmp) (const char *, const char *);
+
+ cmp = (case_sensitivity == case_sensitive_on
+ ? strcmp : strcasecmp);
+ match = cmp (SYMBOL_LINKAGE_NAME (msymbol),
+ modified_name) == 0;
}
else
{
+ /* The function respects CASE_SENSITIVITY. */
match = SYMBOL_MATCHES_SEARCH_NAME (msymbol,
modified_name);
}
case mst_file_data:
case mst_file_bss:
if (sfile == NULL
- || strcmp (msymbol->filename, sfile) == 0)
+ || filename_cmp (msymbol->filename, sfile) == 0)
found_file_symbol = msymbol;
break;
case mst_solib_trampoline:
/* If a trampoline symbol is found, we prefer to
- keep looking for the *real* symbol. If the
+ keep looking for the *real* symbol. If the
actual symbol is not found, then we'll use the
- trampoline entry. */
+ trampoline entry. */
if (trampoline_symbol == NULL)
trampoline_symbol = msymbol;
break;
return NULL;
}
-/* Look through all the current minimal symbol tables and find the
- first minimal symbol that matches NAME and has text type. If OBJF
- is non-NULL, limit the search to that objfile. Returns a pointer
- to the minimal symbol that matches, or NULL if no match is found.
+/* See minsyms.h. */
- This function only searches the mangled (linkage) names. */
+void
+iterate_over_minimal_symbols (struct objfile *objf, const char *name,
+ void (*callback) (struct minimal_symbol *,
+ void *),
+ void *user_data)
+{
+ unsigned int hash;
+ struct minimal_symbol *iter;
+ int (*cmp) (const char *, const char *);
+
+ /* The first pass is over the ordinary hash table. */
+ hash = msymbol_hash (name) % MINIMAL_SYMBOL_HASH_SIZE;
+ iter = objf->msymbol_hash[hash];
+ cmp = (case_sensitivity == case_sensitive_on ? strcmp : strcasecmp);
+ while (iter)
+ {
+ if (cmp (SYMBOL_LINKAGE_NAME (iter), name) == 0)
+ (*callback) (iter, user_data);
+ iter = iter->hash_next;
+ }
+
+ /* The second pass is over the demangled table. */
+ hash = msymbol_hash_iw (name) % MINIMAL_SYMBOL_HASH_SIZE;
+ iter = objf->msymbol_demangled_hash[hash];
+ while (iter)
+ {
+ if (SYMBOL_MATCHES_SEARCH_NAME (iter, name))
+ (*callback) (iter, user_data);
+ iter = iter->demangled_hash_next;
+ }
+}
+
+/* See minsyms.h. */
struct minimal_symbol *
lookup_minimal_symbol_text (const char *name, struct objfile *objf)
msymbol = msymbol->hash_next)
{
if (strcmp (SYMBOL_LINKAGE_NAME (msymbol), name) == 0 &&
- (MSYMBOL_TYPE (msymbol) == mst_text ||
- MSYMBOL_TYPE (msymbol) == mst_file_text))
+ (MSYMBOL_TYPE (msymbol) == mst_text
+ || MSYMBOL_TYPE (msymbol) == mst_text_gnu_ifunc
+ || MSYMBOL_TYPE (msymbol) == mst_file_text))
{
switch (MSYMBOL_TYPE (msymbol))
{
return NULL;
}
-/* Look through all the current minimal symbol tables and find the
- first minimal symbol that matches NAME and PC. If OBJF is non-NULL,
- limit the search to that objfile. Returns a pointer to the minimal
- symbol that matches, or NULL if no match is found. */
+/* See minsyms.h. */
struct minimal_symbol *
lookup_minimal_symbol_by_pc_name (CORE_ADDR pc, const char *name,
return NULL;
}
-/* Look through all the current minimal symbol tables and find the
- first minimal symbol that matches NAME and is a solib trampoline.
- If OBJF is non-NULL, limit the search to that objfile. Returns a
- pointer to the minimal symbol that matches, or NULL if no match is
- found.
-
- This function only searches the mangled (linkage) names. */
+/* See minsyms.h. */
struct minimal_symbol *
lookup_minimal_symbol_solib_trampoline (const char *name,
a binary search. Note that a minimal symbol table always consists
of at least two symbols, a "real" symbol and the terminating
"null symbol". If there are no real symbols, then there is no
- minimal symbol table at all. */
+ minimal symbol table at all. */
if (objfile->minimal_symbol_count > 0)
{
terminates. In essence, we are iterating the test interval
down until the pc value is pushed out of it from the high end.
- Warning: this code is trickier than it would appear at first. */
+ Warning: this code is trickier than it would appear at first. */
- /* Should also require that pc is <= end of objfile. FIXME! */
+ /* Should also require that pc is <= end of objfile. FIXME! */
if (pc >= SYMBOL_VALUE_ADDRESS (&msymbol[lo]))
{
while (SYMBOL_VALUE_ADDRESS (&msymbol[hi]) > pc)
{
- /* pc is still strictly less than highest address */
- /* Note "new" will always be >= lo */
+ /* pc is still strictly less than highest address. */
+ /* Note "new" will always be >= lo. */
new = (lo + hi) / 2;
if ((SYMBOL_VALUE_ADDRESS (&msymbol[new]) >= pc) ||
(lo == new))
/* If we are looking for a trampoline and this is a
text symbol, or the other way around, check the
- preceeding symbol too. If they are otherwise
+ preceding symbol too. If they are otherwise
identical prefer that one. */
if (hi > 0
&& MSYMBOL_TYPE (&msymbol[hi]) == other_type
/* The minimal symbol indexed by hi now is the best one in this
objfile's minimal symbol table. See if it is the best one
- overall. */
+ overall. */
if (hi >= 0
&& ((best_symbol == NULL) ||
return lookup_minimal_symbol_by_pc_section_1 (pc, section, 0);
}
-/* Backward compatibility: search through the minimal symbol table
- for a matching PC (no section given) */
+/* See minsyms.h. */
struct minimal_symbol *
lookup_minimal_symbol_by_pc (CORE_ADDR pc)
return lookup_minimal_symbol_by_pc_section (pc, NULL);
}
-/* Find the minimal symbol named NAME, and return both the minsym
- struct and its objfile. This only checks the linkage name. Sets
- *OBJFILE_P and returns the minimal symbol, if it is found. If it
- is not found, returns NULL. */
+/* Return non-zero iff PC is in an STT_GNU_IFUNC function resolver. */
+
+int
+in_gnu_ifunc_stub (CORE_ADDR pc)
+{
+ struct minimal_symbol *msymbol = lookup_minimal_symbol_by_pc (pc);
+
+ return msymbol && MSYMBOL_TYPE (msymbol) == mst_text_gnu_ifunc;
+}
+
+/* See elf_gnu_ifunc_resolve_addr for its real implementation. */
+
+static CORE_ADDR
+stub_gnu_ifunc_resolve_addr (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ error (_("GDB cannot resolve STT_GNU_IFUNC symbol at address %s without "
+ "the ELF support compiled in."),
+ paddress (gdbarch, pc));
+}
+
+/* See elf_gnu_ifunc_resolve_name for its real implementation. */
+
+static int
+stub_gnu_ifunc_resolve_name (const char *function_name,
+ CORE_ADDR *function_address_p)
+{
+ error (_("GDB cannot resolve STT_GNU_IFUNC symbol \"%s\" without "
+ "the ELF support compiled in."),
+ function_name);
+}
+
+/* See elf_gnu_ifunc_resolver_stop for its real implementation. */
+
+static void
+stub_gnu_ifunc_resolver_stop (struct breakpoint *b)
+{
+ internal_error (__FILE__, __LINE__,
+ _("elf_gnu_ifunc_resolver_stop cannot be reached."));
+}
+
+/* See elf_gnu_ifunc_resolver_return_stop for its real implementation. */
+
+static void
+stub_gnu_ifunc_resolver_return_stop (struct breakpoint *b)
+{
+ internal_error (__FILE__, __LINE__,
+ _("elf_gnu_ifunc_resolver_return_stop cannot be reached."));
+}
+
+/* See elf_gnu_ifunc_fns for its real implementation. */
+
+static const struct gnu_ifunc_fns stub_gnu_ifunc_fns =
+{
+ stub_gnu_ifunc_resolve_addr,
+ stub_gnu_ifunc_resolve_name,
+ stub_gnu_ifunc_resolver_stop,
+ stub_gnu_ifunc_resolver_return_stop,
+};
+
+/* A placeholder for &elf_gnu_ifunc_fns. */
+
+const struct gnu_ifunc_fns *gnu_ifunc_fns_p = &stub_gnu_ifunc_fns;
+
+/* See minsyms.h. */
struct minimal_symbol *
lookup_minimal_symbol_and_objfile (const char *name,
}
\f
-/* Return leading symbol character for a BFD. If BFD is NULL,
+/* Return leading symbol character for a BFD. If BFD is NULL,
return the leading symbol character from the main objfile. */
static int get_symbol_leading_char (bfd *);
return 0;
}
-/* Prepare to start collecting minimal symbols. Note that presetting
- msym_bunch_index to BUNCH_SIZE causes the first call to save a minimal
- symbol to allocate the memory for the first bunch. */
+/* See minsyms.h. */
void
init_minimal_symbol_collection (void)
{
msym_count = 0;
msym_bunch = NULL;
+ /* Note that presetting msym_bunch_index to BUNCH_SIZE causes the
+ first call to save a minimal symbol to allocate the memory for
+ the first bunch. */
msym_bunch_index = BUNCH_SIZE;
}
+/* See minsyms.h. */
+
void
prim_record_minimal_symbol (const char *name, CORE_ADDR address,
enum minimal_symbol_type ms_type,
switch (ms_type)
{
case mst_text:
+ case mst_text_gnu_ifunc:
case mst_file_text:
case mst_solib_trampoline:
section = SECT_OFF_TEXT (objfile);
section, NULL, objfile);
}
-/* Record a minimal symbol in the msym bunches. Returns the symbol
- newly created. */
+/* See minsyms.h. */
struct minimal_symbol *
prim_record_minimal_symbol_full (const char *name, int name_len, int copy_name,
return (NULL);
/* It's safe to strip the leading char here once, since the name
- is also stored stripped in the minimal symbol table. */
+ is also stored stripped in the minimal symbol table. */
if (name[0] == get_symbol_leading_char (objfile->obfd))
{
++name;
MSYMBOL_TYPE (msymbol) = ms_type;
MSYMBOL_TARGET_FLAG_1 (msymbol) = 0;
MSYMBOL_TARGET_FLAG_2 (msymbol) = 0;
- MSYMBOL_SIZE (msymbol) = 0;
+ /* Do not use the SET_MSYMBOL_SIZE macro to initialize the size,
+ as it would also set the has_size flag. */
+ msymbol->size = 0;
/* The hash pointers must be cleared! If they're not,
- add_minsym_to_hash_table will NOT add this msymbol to the hash table. */
+ add_minsym_to_hash_table will NOT add this msymbol to the hash table. */
msymbol->hash_next = NULL;
msymbol->demangled_hash_next = NULL;
return msymbol;
}
-/* Record a minimal symbol in the msym bunches. Returns the symbol
- newly created. */
+/* See minsyms.h. */
struct minimal_symbol *
prim_record_minimal_symbol_and_info (const char *name, CORE_ADDR address,
}
/* Compare two minimal symbols by address and return a signed result based
- on unsigned comparisons, so that we sort into unsigned numeric order.
+ on unsigned comparisons, so that we sort into unsigned numeric order.
Within groups with the same address, sort by name. */
static int
if (SYMBOL_VALUE_ADDRESS (fn1) < SYMBOL_VALUE_ADDRESS (fn2))
{
- return (-1); /* addr 1 is less than addr 2 */
+ return (-1); /* addr 1 is less than addr 2. */
}
else if (SYMBOL_VALUE_ADDRESS (fn1) > SYMBOL_VALUE_ADDRESS (fn2))
{
- return (1); /* addr 1 is greater than addr 2 */
+ return (1); /* addr 1 is greater than addr 2. */
}
else
/* addrs are equal: sort by name */
{
- char *name1 = SYMBOL_LINKAGE_NAME (fn1);
- char *name2 = SYMBOL_LINKAGE_NAME (fn2);
+ const char *name1 = SYMBOL_LINKAGE_NAME (fn1);
+ const char *name2 = SYMBOL_LINKAGE_NAME (fn2);
if (name1 && name2) /* both have names */
return strcmp (name1, name2);
else if (name2)
- return 1; /* fn1 has no name, so it is "less" */
- else if (name1) /* fn2 has no name, so it is "less" */
+ return 1; /* fn1 has no name, so it is "less". */
+ else if (name1) /* fn2 has no name, so it is "less". */
return -1;
else
- return (0); /* neither has a name, so they're equal. */
+ return (0); /* Neither has a name, so they're equal. */
}
}
FIXME: We could allocate the minimal symbol bunches on their own
obstack and then simply blow the obstack away when we are done with
- it. Is it worth the extra trouble though? */
+ it. Is it worth the extra trouble though? */
static void
do_discard_minimal_symbols_cleanup (void *arg)
}
}
+/* See minsyms.h. */
+
struct cleanup *
make_cleanup_discard_minimal_symbols (void)
{
/* Build (or rebuild) the minimal symbol hash tables. This is necessary
after compacting or sorting the table since the entries move around
- thus causing the internal minimal_symbol pointers to become jumbled. */
+ thus causing the internal minimal_symbol pointers to become jumbled. */
static void
build_minimal_symbol_hash_tables (struct objfile *objfile)
int i;
struct minimal_symbol *msym;
- /* Clear the hash tables. */
+ /* Clear the hash tables. */
for (i = 0; i < MINIMAL_SYMBOL_HASH_SIZE; i++)
{
objfile->msymbol_hash[i] = 0;
objfile->msymbol_demangled_hash[i] = 0;
}
- /* Now, (re)insert the actual entries. */
+ /* Now, (re)insert the actual entries. */
for (i = objfile->minimal_symbol_count, msym = objfile->msymbols;
i > 0;
i--, msym++)
to demangle it, and if successful, record it as a language_cplus symbol
and cache the demangled form on the symbol obstack. Symbols which don't
demangle are marked as language_unknown symbols, which inhibits future
- attempts to demangle them if we later add more minimal symbols. */
+ attempts to demangle them if we later add more minimal symbols. */
void
install_minimal_symbols (struct objfile *objfile)
if (msym_count > 0)
{
+ if (symtab_create_debug)
+ {
+ fprintf_unfiltered (gdb_stdlog,
+ "Installing %d minimal symbols of objfile %s.\n",
+ msym_count, objfile->name);
+ }
+
/* Allocate enough space in the obstack, into which we will gather the
bunches of new and existing minimal symbols, sort them, and then
compact out the duplicate entries. Once we have a final table,
to the new contiguous array of symbols. Note that we start with the
current, possibly partially filled bunch (thus we use the current
msym_bunch_index for the first bunch we copy over), and thereafter
- each bunch is full. */
+ each bunch is full. */
mcount = objfile->minimal_symbol_count;
to some symbol in the middle of it. Zero out the fields in the
"null symbol" allocated at the end of the array. Note that the
symbol count does *not* include this null symbol, which is why it
- is indexed by mcount and not mcount-1. */
+ is indexed by mcount and not mcount-1. */
- SYMBOL_LINKAGE_NAME (&msymbols[mcount]) = NULL;
- SYMBOL_VALUE_ADDRESS (&msymbols[mcount]) = 0;
- MSYMBOL_TARGET_FLAG_1 (&msymbols[mcount]) = 0;
- MSYMBOL_TARGET_FLAG_2 (&msymbols[mcount]) = 0;
- MSYMBOL_SIZE (&msymbols[mcount]) = 0;
- MSYMBOL_TYPE (&msymbols[mcount]) = mst_unknown;
- SYMBOL_SET_LANGUAGE (&msymbols[mcount], language_unknown);
+ memset (&msymbols[mcount], 0, sizeof (struct minimal_symbol));
/* Attach the minimal symbol table to the specified objfile.
The strings themselves are also located in the objfile_obstack
/* Now build the hash tables; we can't do this incrementally
at an earlier point since we weren't finished with the obstack
yet. (And if the msymbol obstack gets moved, all the internal
- pointers to other msymbols need to be adjusted.) */
+ pointers to other msymbols need to be adjusted.) */
build_minimal_symbol_hash_tables (objfile);
}
}
+/* See minsyms.h. */
+
+void
+terminate_minimal_symbol_table (struct objfile *objfile)
+{
+ if (! objfile->msymbols)
+ objfile->msymbols = ((struct minimal_symbol *)
+ obstack_alloc (&objfile->objfile_obstack,
+ sizeof (objfile->msymbols[0])));
+
+ {
+ struct minimal_symbol *m
+ = &objfile->msymbols[objfile->minimal_symbol_count];
+
+ memset (m, 0, sizeof (*m));
+ /* Don't rely on these enumeration values being 0's. */
+ MSYMBOL_TYPE (m) = mst_unknown;
+ SYMBOL_SET_LANGUAGE (m, language_unknown);
+ }
+}
+
/* Sort all the minimal symbols in OBJFILE. */
void
build_minimal_symbol_hash_tables (objfile);
}
-/* Check if PC is in a shared library trampoline code stub.
- Return minimal symbol for the trampoline entry or NULL if PC is not
- in a trampoline code stub. */
+/* See minsyms.h. */
struct minimal_symbol *
lookup_solib_trampoline_symbol_by_pc (CORE_ADDR pc)
We may fail to find the right function if a function with the
same name is defined in more than one shared library, but this
- is considered bad programming style. We could return 0 if we find
+ is considered bad programming style. We could return 0 if we find
a duplicate function in case this matters someday. */
CORE_ADDR
{
ALL_MSYMBOLS (objfile, msymbol)
{
- if (MSYMBOL_TYPE (msymbol) == mst_text
+ if ((MSYMBOL_TYPE (msymbol) == mst_text
+ || MSYMBOL_TYPE (msymbol) == mst_text_gnu_ifunc)
&& strcmp (SYMBOL_LINKAGE_NAME (msymbol),
SYMBOL_LINKAGE_NAME (tsymbol)) == 0)
return SYMBOL_VALUE_ADDRESS (msymbol);
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