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gcc/gcc/collect2.c
Richard Guenther fa66fc02ec collect2.c (main): Guard object_nbr variable with TARGET_AIX_VERSION. 
2011-11-03  Richard Guenther  <rguenther@suse.de>

	* collect2.c (main): Guard object_nbr variable with TARGET_AIX_VERSION.

From-SVN: r180826
2011-11-03 14:24:59 +00:00

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/* Collect static initialization info into data structures that can be
traversed by C++ initialization and finalization routines.
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998,
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Chris Smith (csmith@convex.com).
Heavily modified by Michael Meissner (meissner@cygnus.com),
Per Bothner (bothner@cygnus.com), and John Gilmore (gnu@cygnus.com).
This file is part of GCC.
GCC 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.
GCC 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.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* Build tables of static constructors and destructors and run ld. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "filenames.h"
/* TARGET_64BIT may be defined to use driver specific functionality. */
#undef TARGET_64BIT
#define TARGET_64BIT TARGET_64BIT_DEFAULT
#ifndef LIBRARY_PATH_ENV
#define LIBRARY_PATH_ENV "LIBRARY_PATH"
#endif
#define COLLECT
#include "collect2.h"
#include "collect2-aix.h"
#include "diagnostic.h"
#include "demangle.h"
#include "obstack.h"
#include "intl.h"
#include "version.h"
/* On certain systems, we have code that works by scanning the object file
directly. But this code uses system-specific header files and library
functions, so turn it off in a cross-compiler. Likewise, the names of
the utilities are not correct for a cross-compiler; we have to hope that
cross-versions are in the proper directories. */
#ifdef CROSS_DIRECTORY_STRUCTURE
#ifndef CROSS_AIX_SUPPORT
#undef OBJECT_FORMAT_COFF
#endif
#undef MD_EXEC_PREFIX
#undef REAL_LD_FILE_NAME
#undef REAL_NM_FILE_NAME
#undef REAL_STRIP_FILE_NAME
#endif
/* If we cannot use a special method, use the ordinary one:
run nm to find what symbols are present.
In a cross-compiler, this means you need a cross nm,
but that is not quite as unpleasant as special headers. */
#if !defined (OBJECT_FORMAT_COFF)
#define OBJECT_FORMAT_NONE
#endif
#ifdef OBJECT_FORMAT_COFF
#ifndef CROSS_DIRECTORY_STRUCTURE
#include <a.out.h>
#include <ar.h>
#ifdef UMAX
#include <sgs.h>
#endif
/* Many versions of ldfcn.h define these. */
#ifdef FREAD
#undef FREAD
#undef FWRITE
#endif
#include <ldfcn.h>
#endif
/* Some systems have an ISCOFF macro, but others do not. In some cases
the macro may be wrong. MY_ISCOFF is defined in tm.h files for machines
that either do not have an ISCOFF macro in /usr/include or for those
where it is wrong. */
#ifndef MY_ISCOFF
#define MY_ISCOFF(X) ISCOFF (X)
#endif
#endif /* OBJECT_FORMAT_COFF */
#ifdef OBJECT_FORMAT_NONE
/* Default flags to pass to nm. */
#ifndef NM_FLAGS
#define NM_FLAGS "-n"
#endif
#endif /* OBJECT_FORMAT_NONE */
/* Some systems use __main in a way incompatible with its use in gcc, in these
cases use the macros NAME__MAIN to give a quoted symbol and SYMBOL__MAIN to
give the same symbol without quotes for an alternative entry point. */
#ifndef NAME__MAIN
#define NAME__MAIN "__main"
#endif
/* This must match tree.h. */
#define DEFAULT_INIT_PRIORITY 65535
#ifndef COLLECT_SHARED_INIT_FUNC
#define COLLECT_SHARED_INIT_FUNC(STREAM, FUNC) \
fprintf ((STREAM), "void _GLOBAL__DI() {\n\t%s();\n}\n", (FUNC))
#endif
#ifndef COLLECT_SHARED_FINI_FUNC
#define COLLECT_SHARED_FINI_FUNC(STREAM, FUNC) \
fprintf ((STREAM), "void _GLOBAL__DD() {\n\t%s();\n}\n", (FUNC))
#endif
#ifdef LDD_SUFFIX
#define SCAN_LIBRARIES
#endif
#ifndef SHLIB_SUFFIX
#define SHLIB_SUFFIX ".so"
#endif
#ifdef USE_COLLECT2
int do_collecting = 1;
#else
int do_collecting = 0;
#endif
/* Cook up an always defined indication of whether we proceed the
"EXPORT_LIST" way. */
#ifdef COLLECT_EXPORT_LIST
#define DO_COLLECT_EXPORT_LIST 1
#else
#define DO_COLLECT_EXPORT_LIST 0
#endif
/* Nonzero if we should suppress the automatic demangling of identifiers
in linker error messages. Set from COLLECT_NO_DEMANGLE. */
int no_demangle;
/* Linked lists of constructor and destructor names. */
struct id
{
struct id *next;
int sequence;
char name[1];
};
struct head
{
struct id *first;
struct id *last;
int number;
};
bool vflag; /* true if -v or --version */
static int rflag; /* true if -r */
static int strip_flag; /* true if -s */
#ifdef COLLECT_EXPORT_LIST
static int export_flag; /* true if -bE */
static int aix64_flag; /* true if -b64 */
static int aixrtl_flag; /* true if -brtl */
#endif
enum lto_mode_d {
LTO_MODE_NONE, /* Not doing LTO. */
LTO_MODE_LTO, /* Normal LTO. */
LTO_MODE_WHOPR /* WHOPR. */
};
/* Current LTO mode. */
static enum lto_mode_d lto_mode = LTO_MODE_NONE;
bool debug; /* true if -debug */
bool helpflag; /* true if --help */
static int shared_obj; /* true if -shared */
static const char *c_file; /* <xxx>.c for constructor/destructor list. */
static const char *o_file; /* <xxx>.o for constructor/destructor list. */
#ifdef COLLECT_EXPORT_LIST
static const char *export_file; /* <xxx>.x for AIX export list. */
#endif
static char **lto_o_files; /* Output files for LTO. */
const char *ldout; /* File for ld stdout. */
const char *lderrout; /* File for ld stderr. */
static const char *output_file; /* Output file for ld. */
static const char *nm_file_name; /* pathname of nm */
#ifdef LDD_SUFFIX
static const char *ldd_file_name; /* pathname of ldd (or equivalent) */
#endif
static const char *strip_file_name; /* pathname of strip */
const char *c_file_name; /* pathname of gcc */
static char *initname, *fininame; /* names of init and fini funcs */
static struct head constructors; /* list of constructors found */
static struct head destructors; /* list of destructors found */
#ifdef COLLECT_EXPORT_LIST
static struct head exports; /* list of exported symbols */
#endif
static struct head frame_tables; /* list of frame unwind info tables */
static bool at_file_supplied; /* Whether to use @file arguments */
static char *response_file; /* Name of any current response file */
struct obstack temporary_obstack;
char * temporary_firstobj;
/* A string that must be prepended to a target OS path in order to find
it on the host system. */
#ifdef TARGET_SYSTEM_ROOT
static const char *target_system_root = TARGET_SYSTEM_ROOT;
#else
static const char *target_system_root = "";
#endif
/* Structure to hold all the directories in which to search for files to
execute. */
struct prefix_list
{
const char *prefix; /* String to prepend to the path. */
struct prefix_list *next; /* Next in linked list. */
};
struct path_prefix
{
struct prefix_list *plist; /* List of prefixes to try */
int max_len; /* Max length of a prefix in PLIST */
const char *name; /* Name of this list (used in config stuff) */
};
#ifdef COLLECT_EXPORT_LIST
/* Lists to keep libraries to be scanned for global constructors/destructors. */
static struct head libs; /* list of libraries */
static struct path_prefix cmdline_lib_dirs; /* directories specified with -L */
static struct path_prefix libpath_lib_dirs; /* directories in LIBPATH */
static struct path_prefix *libpaths[3] = {&cmdline_lib_dirs,
&libpath_lib_dirs, NULL};
#endif
/* List of names of object files containing LTO information.
These are a subset of the object file names appearing on the
command line, and must be identical, in the sense of pointer
equality, with the names passed to maybe_run_lto_and_relink(). */
struct lto_object
{
const char *name; /* Name of object file. */
struct lto_object *next; /* Next in linked list. */
};
struct lto_object_list
{
struct lto_object *first; /* First list element. */
struct lto_object *last; /* Last list element. */
};
static struct lto_object_list lto_objects;
/* Special kinds of symbols that a name may denote. */
typedef enum {
SYM_REGULAR = 0, /* nothing special */
SYM_CTOR = 1, /* constructor */
SYM_DTOR = 2, /* destructor */
SYM_INIT = 3, /* shared object routine that calls all the ctors */
SYM_FINI = 4, /* shared object routine that calls all the dtors */
SYM_DWEH = 5 /* DWARF exception handling table */
} symkind;
static symkind is_ctor_dtor (const char *);
static void handler (int);
static char *find_a_file (struct path_prefix *, const char *);
static void add_prefix (struct path_prefix *, const char *);
static void prefix_from_env (const char *, struct path_prefix *);
static void prefix_from_string (const char *, struct path_prefix *);
static void do_wait (const char *, struct pex_obj *);
static void fork_execute (const char *, char **);
static void maybe_unlink (const char *);
static void maybe_unlink_list (char **);
static void add_to_list (struct head *, const char *);
static int extract_init_priority (const char *);
static void sort_ids (struct head *);
static void write_list (FILE *, const char *, struct id *);
#ifdef COLLECT_EXPORT_LIST
static void dump_list (FILE *, const char *, struct id *);
#endif
#if 0
static void dump_prefix_list (FILE *, const char *, struct prefix_list *);
#endif
static void write_list_with_asm (FILE *, const char *, struct id *);
static void write_c_file (FILE *, const char *);
static void write_c_file_stat (FILE *, const char *);
#ifndef LD_INIT_SWITCH
static void write_c_file_glob (FILE *, const char *);
#endif
#ifdef SCAN_LIBRARIES
static void scan_libraries (const char *);
#endif
#if LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
static int is_in_args (const char *, const char **, const char **);
#endif
#ifdef COLLECT_EXPORT_LIST
#if 0
static int is_in_list (const char *, struct id *);
#endif
static void write_aix_file (FILE *, struct id *);
static char *resolve_lib_name (const char *);
#endif
static char *extract_string (const char **);
static void post_ld_pass (bool);
static void process_args (int *argcp, char **argv);
/* Enumerations describing which pass this is for scanning the
program file ... */
typedef enum {
PASS_FIRST, /* without constructors */
PASS_OBJ, /* individual objects */
PASS_LIB, /* looking for shared libraries */
PASS_SECOND, /* with constructors linked in */
PASS_LTOINFO /* looking for objects with LTO info */
} scanpass;
/* ... and which kinds of symbols are to be considered. */
enum scanfilter_masks {
SCAN_NOTHING = 0,
SCAN_CTOR = 1 << SYM_CTOR,
SCAN_DTOR = 1 << SYM_DTOR,
SCAN_INIT = 1 << SYM_INIT,
SCAN_FINI = 1 << SYM_FINI,
SCAN_DWEH = 1 << SYM_DWEH,
SCAN_ALL = ~0
};
/* This type is used for parameters and variables which hold
combinations of the flags in enum scanfilter_masks. */
typedef int scanfilter;
/* Scan the name list of the loaded program for the symbols g++ uses for
static constructors and destructors.
The SCANPASS argument tells which collect processing pass this is for and
the SCANFILTER argument tells which kinds of symbols to consider in this
pass. Symbols of a special kind not in the filter mask are considered as
regular ones.
The constructor table begins at __CTOR_LIST__ and contains a count of the
number of pointers (or -1 if the constructors are built in a separate
section by the linker), followed by the pointers to the constructor
functions, terminated with a null pointer. The destructor table has the
same format, and begins at __DTOR_LIST__. */
static void scan_prog_file (const char *, scanpass, scanfilter);
/* Delete tempfiles and exit function. */
void
collect_exit (int status)
{
if (c_file != 0 && c_file[0])
maybe_unlink (c_file);
if (o_file != 0 && o_file[0])
maybe_unlink (o_file);
#ifdef COLLECT_EXPORT_LIST
if (export_file != 0 && export_file[0])
maybe_unlink (export_file);
#endif
if (lto_o_files)
maybe_unlink_list (lto_o_files);
if (ldout != 0 && ldout[0])
{
dump_file (ldout, stdout);
maybe_unlink (ldout);
}
if (lderrout != 0 && lderrout[0])
{
dump_file (lderrout, stderr);
maybe_unlink (lderrout);
}
if (status != 0 && output_file != 0 && output_file[0])
maybe_unlink (output_file);
if (response_file)
maybe_unlink (response_file);
exit (status);
}
/* Notify user of a non-error. */
void
notice (const char *cmsgid, ...)
{
va_list ap;
va_start (ap, cmsgid);
vfprintf (stderr, _(cmsgid), ap);
va_end (ap);
}
/* Notify user of a non-error, without translating the format string. */
void
notice_translated (const char *cmsgid, ...)
{
va_list ap;
va_start (ap, cmsgid);
vfprintf (stderr, cmsgid, ap);
va_end (ap);
}
static void
handler (int signo)
{
if (c_file != 0 && c_file[0])
maybe_unlink (c_file);
if (o_file != 0 && o_file[0])
maybe_unlink (o_file);
if (ldout != 0 && ldout[0])
maybe_unlink (ldout);
if (lderrout != 0 && lderrout[0])
maybe_unlink (lderrout);
#ifdef COLLECT_EXPORT_LIST
if (export_file != 0 && export_file[0])
maybe_unlink (export_file);
#endif
if (lto_o_files)
maybe_unlink_list (lto_o_files);
if (response_file)
maybe_unlink (response_file);
signal (signo, SIG_DFL);
raise (signo);
}
int
file_exists (const char *name)
{
return access (name, R_OK) == 0;
}
/* Parse a reasonable subset of shell quoting syntax. */
static char *
extract_string (const char **pp)
{
const char *p = *pp;
int backquote = 0;
int inside = 0;
for (;;)
{
char c = *p;
if (c == '\0')
break;
++p;
if (backquote)
obstack_1grow (&temporary_obstack, c);
else if (! inside && c == ' ')
break;
else if (! inside && c == '\\')
backquote = 1;
else if (c == '\'')
inside = !inside;
else
obstack_1grow (&temporary_obstack, c);
}
obstack_1grow (&temporary_obstack, '\0');
*pp = p;
return XOBFINISH (&temporary_obstack, char *);
}
void
dump_file (const char *name, FILE *to)
{
FILE *stream = fopen (name, "r");
if (stream == 0)
return;
while (1)
{
int c;
while (c = getc (stream),
c != EOF && (ISIDNUM (c) || c == '$' || c == '.'))
obstack_1grow (&temporary_obstack, c);
if (obstack_object_size (&temporary_obstack) > 0)
{
const char *word, *p;
char *result;
obstack_1grow (&temporary_obstack, '\0');
word = XOBFINISH (&temporary_obstack, const char *);
if (*word == '.')
++word, putc ('.', to);
p = word;
if (!strncmp (p, USER_LABEL_PREFIX, strlen (USER_LABEL_PREFIX)))
p += strlen (USER_LABEL_PREFIX);
#ifdef HAVE_LD_DEMANGLE
result = 0;
#else
if (no_demangle)
result = 0;
else
result = cplus_demangle (p, DMGL_PARAMS | DMGL_ANSI | DMGL_VERBOSE);
#endif
if (result)
{
int diff;
fputs (result, to);
diff = strlen (word) - strlen (result);
while (diff > 0 && c == ' ')
--diff, putc (' ', to);
if (diff < 0 && c == ' ')
{
while (diff < 0 && c == ' ')
++diff, c = getc (stream);
if (!ISSPACE (c))
{
/* Make sure we output at least one space, or
the demangled symbol name will run into
whatever text follows. */
putc (' ', to);
}
}
free (result);
}
else
fputs (word, to);
fflush (to);
obstack_free (&temporary_obstack, temporary_firstobj);
}
if (c == EOF)
break;
putc (c, to);
}
fclose (stream);
}
/* Return the kind of symbol denoted by name S. */
static symkind
is_ctor_dtor (const char *s)
{
struct names { const char *const name; const int len; symkind ret;
const int two_underscores; };
const struct names *p;
int ch;
const char *orig_s = s;
static const struct names special[] = {
#ifndef NO_DOLLAR_IN_LABEL
{ "GLOBAL__I$", sizeof ("GLOBAL__I$")-1, SYM_CTOR, 0 },
{ "GLOBAL__D$", sizeof ("GLOBAL__D$")-1, SYM_DTOR, 0 },
#else
#ifndef NO_DOT_IN_LABEL
{ "GLOBAL__I.", sizeof ("GLOBAL__I.")-1, SYM_CTOR, 0 },
{ "GLOBAL__D.", sizeof ("GLOBAL__D.")-1, SYM_DTOR, 0 },
#endif /* NO_DOT_IN_LABEL */
#endif /* NO_DOLLAR_IN_LABEL */
{ "GLOBAL__I_", sizeof ("GLOBAL__I_")-1, SYM_CTOR, 0 },
{ "GLOBAL__D_", sizeof ("GLOBAL__D_")-1, SYM_DTOR, 0 },
{ "GLOBAL__F_", sizeof ("GLOBAL__F_")-1, SYM_DWEH, 0 },
{ "GLOBAL__FI_", sizeof ("GLOBAL__FI_")-1, SYM_INIT, 0 },
{ "GLOBAL__FD_", sizeof ("GLOBAL__FD_")-1, SYM_FINI, 0 },
{ NULL, 0, SYM_REGULAR, 0 }
};
while ((ch = *s) == '_')
++s;
if (s == orig_s)
return SYM_REGULAR;
for (p = &special[0]; p->len > 0; p++)
{
if (ch == p->name[0]
&& (!p->two_underscores || ((s - orig_s) >= 2))
&& strncmp(s, p->name, p->len) == 0)
{
return p->ret;
}
}
return SYM_REGULAR;
}
/* We maintain two prefix lists: one from COMPILER_PATH environment variable
and one from the PATH variable. */
static struct path_prefix cpath, path;
#ifdef CROSS_DIRECTORY_STRUCTURE
/* This is the name of the target machine. We use it to form the name
of the files to execute. */
static const char *const target_machine = TARGET_MACHINE;
#endif
/* Search for NAME using prefix list PPREFIX. We only look for executable
files.
Return 0 if not found, otherwise return its name, allocated with malloc. */
static char *
find_a_file (struct path_prefix *pprefix, const char *name)
{
char *temp;
struct prefix_list *pl;
int len = pprefix->max_len + strlen (name) + 1;
if (debug)
fprintf (stderr, "Looking for '%s'\n", name);
#ifdef HOST_EXECUTABLE_SUFFIX
len += strlen (HOST_EXECUTABLE_SUFFIX);
#endif
temp = XNEWVEC (char, len);
/* Determine the filename to execute (special case for absolute paths). */
if (IS_ABSOLUTE_PATH (name))
{
if (access (name, X_OK) == 0)
{
strcpy (temp, name);
if (debug)
fprintf (stderr, " - found: absolute path\n");
return temp;
}
#ifdef HOST_EXECUTABLE_SUFFIX
/* Some systems have a suffix for executable files.
So try appending that. */
strcpy (temp, name);
strcat (temp, HOST_EXECUTABLE_SUFFIX);
if (access (temp, X_OK) == 0)
return temp;
#endif
if (debug)
fprintf (stderr, " - failed to locate using absolute path\n");
}
else
for (pl = pprefix->plist; pl; pl = pl->next)
{
struct stat st;
strcpy (temp, pl->prefix);
strcat (temp, name);
if (stat (temp, &st) >= 0
&& ! S_ISDIR (st.st_mode)
&& access (temp, X_OK) == 0)
return temp;
#ifdef HOST_EXECUTABLE_SUFFIX
/* Some systems have a suffix for executable files.
So try appending that. */
strcat (temp, HOST_EXECUTABLE_SUFFIX);
if (stat (temp, &st) >= 0
&& ! S_ISDIR (st.st_mode)
&& access (temp, X_OK) == 0)
return temp;
#endif
}
if (debug && pprefix->plist == NULL)
fprintf (stderr, " - failed: no entries in prefix list\n");
free (temp);
return 0;
}
/* Add an entry for PREFIX to prefix list PPREFIX. */
static void
add_prefix (struct path_prefix *pprefix, const char *prefix)
{
struct prefix_list *pl, **prev;
int len;
if (pprefix->plist)
{
for (pl = pprefix->plist; pl->next; pl = pl->next)
;
prev = &pl->next;
}
else
prev = &pprefix->plist;
/* Keep track of the longest prefix. */
len = strlen (prefix);
if (len > pprefix->max_len)
pprefix->max_len = len;
pl = XNEW (struct prefix_list);
pl->prefix = xstrdup (prefix);
if (*prev)
pl->next = *prev;
else
pl->next = (struct prefix_list *) 0;
*prev = pl;
}
/* Take the value of the environment variable ENV, break it into a path, and
add of the entries to PPREFIX. */
static void
prefix_from_env (const char *env, struct path_prefix *pprefix)
{
const char *p;
p = getenv (env);
if (p)
prefix_from_string (p, pprefix);
}
static void
prefix_from_string (const char *p, struct path_prefix *pprefix)
{
const char *startp, *endp;
char *nstore = XNEWVEC (char, strlen (p) + 3);
if (debug)
fprintf (stderr, "Convert string '%s' into prefixes, separator = '%c'\n", p, PATH_SEPARATOR);
startp = endp = p;
while (1)
{
if (*endp == PATH_SEPARATOR || *endp == 0)
{
strncpy (nstore, startp, endp-startp);
if (endp == startp)
{
strcpy (nstore, "./");
}
else if (! IS_DIR_SEPARATOR (endp[-1]))
{
nstore[endp-startp] = DIR_SEPARATOR;
nstore[endp-startp+1] = 0;
}
else
nstore[endp-startp] = 0;
if (debug)
fprintf (stderr, " - add prefix: %s\n", nstore);
add_prefix (pprefix, nstore);
if (*endp == 0)
break;
endp = startp = endp + 1;
}
else
endp++;
}
free (nstore);
}
#ifdef OBJECT_FORMAT_NONE
/* Add an entry for the object file NAME to object file list LIST.
New entries are added at the end of the list. The original pointer
value of NAME is preserved, i.e., no string copy is performed. */
static void
add_lto_object (struct lto_object_list *list, const char *name)
{
struct lto_object *n = XNEW (struct lto_object);
n->name = name;
n->next = NULL;
if (list->last)
list->last->next = n;
else
list->first = n;
list->last = n;
}
#endif /* OBJECT_FORMAT_NONE */
/* Perform a link-time recompilation and relink if any of the object
files contain LTO info. The linker command line LTO_LD_ARGV
represents the linker command that would produce a final executable
without the use of LTO. OBJECT_LST is a vector of object file names
appearing in LTO_LD_ARGV that are to be considerd for link-time
recompilation, where OBJECT is a pointer to the last valid element.
(This awkward convention avoids an impedance mismatch with the
usage of similarly-named variables in main().) The elements of
OBJECT_LST must be identical, i.e., pointer equal, to the
corresponding arguments in LTO_LD_ARGV.
Upon entry, at least one linker run has been performed without the
use of any LTO info that might be present. Any recompilations
necessary for template instantiations have been performed, and
initializer/finalizer tables have been created if needed and
included in the linker command line LTO_LD_ARGV. If any of the
object files contain LTO info, we run the LTO back end on all such
files, and perform the final link with the LTO back end output
substituted for the LTO-optimized files. In some cases, a final
link with all link-time generated code has already been performed,
so there is no need to relink if no LTO info is found. In other
cases, our caller has not produced the final executable, and is
relying on us to perform the required link whether LTO info is
present or not. In that case, the FORCE argument should be true.
Note that the linker command line argument LTO_LD_ARGV passed into
this function may be modified in place. */
static void
maybe_run_lto_and_relink (char **lto_ld_argv, char **object_lst,
const char **object, bool force)
{
const char **object_file = CONST_CAST2 (const char **, char **, object_lst);
int num_lto_c_args = 1; /* Allow space for the terminating NULL. */
while (object_file < object)
{
/* If file contains LTO info, add it to the list of LTO objects. */
scan_prog_file (*object_file++, PASS_LTOINFO, SCAN_ALL);
/* Increment the argument count by the number of object file arguments
we will add. An upper bound suffices, so just count all of the
object files regardless of whether they contain LTO info. */
num_lto_c_args++;
}
if (lto_objects.first)
{
char **lto_c_argv;
const char **lto_c_ptr;
char **p;
char **lto_o_ptr;
struct lto_object *list;
char *lto_wrapper = getenv ("COLLECT_LTO_WRAPPER");
struct pex_obj *pex;
const char *prog = "lto-wrapper";
int lto_ld_argv_size = 0;
char **out_lto_ld_argv;
int out_lto_ld_argv_size;
size_t num_files;
if (!lto_wrapper)
fatal_error ("COLLECT_LTO_WRAPPER must be set");
num_lto_c_args++;
/* There is at least one object file containing LTO info,
so we need to run the LTO back end and relink.
To do so we build updated ld arguments with first
LTO object replaced by all partitions and other LTO
objects removed. */
lto_c_argv = (char **) xcalloc (sizeof (char *), num_lto_c_args);
lto_c_ptr = CONST_CAST2 (const char **, char **, lto_c_argv);
*lto_c_ptr++ = lto_wrapper;
/* Add LTO objects to the wrapper command line. */
for (list = lto_objects.first; list; list = list->next)
*lto_c_ptr++ = list->name;
*lto_c_ptr = NULL;
/* Run the LTO back end. */
pex = collect_execute (prog, lto_c_argv, NULL, NULL, PEX_SEARCH);
{
int c;
FILE *stream;
size_t i;
char *start, *end;
stream = pex_read_output (pex, 0);
gcc_assert (stream);
num_files = 0;
while ((c = getc (stream)) != EOF)
{
obstack_1grow (&temporary_obstack, c);
if (c == '\n')
++num_files;
}
lto_o_files = XNEWVEC (char *, num_files + 1);
lto_o_files[num_files] = NULL;
start = XOBFINISH (&temporary_obstack, char *);
for (i = 0; i < num_files; ++i)
{
end = start;
while (*end != '\n')
++end;
*end = '\0';
lto_o_files[i] = xstrdup (start);
start = end + 1;
}
obstack_free (&temporary_obstack, temporary_firstobj);
}
do_wait (prog, pex);
pex = NULL;
/* Compute memory needed for new LD arguments. At most number of original arguemtns
plus number of partitions. */
for (lto_ld_argv_size = 0; lto_ld_argv[lto_ld_argv_size]; lto_ld_argv_size++)
;
out_lto_ld_argv = XCNEWVEC(char *, num_files + lto_ld_argv_size + 1);
out_lto_ld_argv_size = 0;
/* After running the LTO back end, we will relink, substituting
the LTO output for the object files that we submitted to the
LTO. Here, we modify the linker command line for the relink. */
/* Copy all arguments until we find first LTO file. */
p = lto_ld_argv;
while (*p != NULL)
{
for (list = lto_objects.first; list; list = list->next)
if (*p == list->name) /* Note test for pointer equality! */
break;
if (list)
break;
out_lto_ld_argv[out_lto_ld_argv_size++] = *p++;
}
/* Now insert all LTO partitions. */
lto_o_ptr = lto_o_files;
while (*lto_o_ptr)
out_lto_ld_argv[out_lto_ld_argv_size++] = *lto_o_ptr++;
/* ... and copy the rest. */
while (*p != NULL)
{
for (list = lto_objects.first; list; list = list->next)
if (*p == list->name) /* Note test for pointer equality! */
break;
if (!list)
out_lto_ld_argv[out_lto_ld_argv_size++] = *p;
p++;
}
out_lto_ld_argv[out_lto_ld_argv_size++] = 0;
/* Run the linker again, this time replacing the object files
optimized by the LTO with the temporary file generated by the LTO. */
fork_execute ("ld", out_lto_ld_argv);
post_ld_pass (true);
free (lto_ld_argv);
maybe_unlink_list (lto_o_files);
}
else if (force)
{
/* Our caller is relying on us to do the link
even though there is no LTO back end work to be done. */
fork_execute ("ld", lto_ld_argv);
post_ld_pass (false);
}
}
/* Main program. */
int
main (int argc, char **argv)
{
static const char *const ld_suffix = "ld";
static const char *const plugin_ld_suffix = PLUGIN_LD;
static const char *const real_ld_suffix = "real-ld";
static const char *const collect_ld_suffix = "collect-ld";
static const char *const nm_suffix = "nm";
static const char *const gnm_suffix = "gnm";
#ifdef LDD_SUFFIX
static const char *const ldd_suffix = LDD_SUFFIX;
#endif
static const char *const strip_suffix = "strip";
static const char *const gstrip_suffix = "gstrip";
#ifdef CROSS_DIRECTORY_STRUCTURE
/* If we look for a program in the compiler directories, we just use
the short name, since these directories are already system-specific.
But it we look for a program in the system directories, we need to
qualify the program name with the target machine. */
const char *const full_ld_suffix =
concat(target_machine, "-", ld_suffix, NULL);
const char *const full_plugin_ld_suffix =
concat(target_machine, "-", plugin_ld_suffix, NULL);
const char *const full_nm_suffix =
concat (target_machine, "-", nm_suffix, NULL);
const char *const full_gnm_suffix =
concat (target_machine, "-", gnm_suffix, NULL);
#ifdef LDD_SUFFIX
const char *const full_ldd_suffix =
concat (target_machine, "-", ldd_suffix, NULL);
#endif
const char *const full_strip_suffix =
concat (target_machine, "-", strip_suffix, NULL);
const char *const full_gstrip_suffix =
concat (target_machine, "-", gstrip_suffix, NULL);
#else
const char *const full_ld_suffix = ld_suffix;
const char *const full_plugin_ld_suffix = plugin_ld_suffix;
const char *const full_nm_suffix = nm_suffix;
const char *const full_gnm_suffix = gnm_suffix;
#ifdef LDD_SUFFIX
const char *const full_ldd_suffix = ldd_suffix;
#endif
const char *const full_strip_suffix = strip_suffix;
const char *const full_gstrip_suffix = gstrip_suffix;
#endif /* CROSS_DIRECTORY_STRUCTURE */
const char *arg;
FILE *outf;
#ifdef COLLECT_EXPORT_LIST
FILE *exportf;
#endif
const char *ld_file_name;
const char *p;
char **c_argv;
const char **c_ptr;
char **ld1_argv;
const char **ld1;
bool use_plugin = false;
/* The kinds of symbols we will have to consider when scanning the
outcome of a first pass link. This is ALL to start with, then might
be adjusted before getting to the first pass link per se, typically on
AIX where we perform an early scan of objects and libraries to fetch
the list of global ctors/dtors and make sure they are not garbage
collected. */
scanfilter ld1_filter = SCAN_ALL;
char **ld2_argv;
const char **ld2;
char **object_lst;
const char **object;
#ifdef TARGET_AIX_VERSION
int object_nbr = argc;
#endif
int first_file;
int num_c_args;
char **old_argv;
p = argv[0] + strlen (argv[0]);
while (p != argv[0] && !IS_DIR_SEPARATOR (p[-1]))
--p;
progname = p;
xmalloc_set_program_name (progname);
old_argv = argv;
expandargv (&argc, &argv);
if (argv != old_argv)
at_file_supplied = 1;
process_args (&argc, argv);
num_c_args = argc + 9;
#ifndef HAVE_LD_DEMANGLE
no_demangle = !! getenv ("COLLECT_NO_DEMANGLE");
/* Suppress demangling by the real linker, which may be broken. */
putenv (xstrdup ("COLLECT_NO_DEMANGLE=1"));
#endif
#if defined (COLLECT2_HOST_INITIALIZATION)
/* Perform system dependent initialization, if necessary. */
COLLECT2_HOST_INITIALIZATION;
#endif
#ifdef SIGCHLD
/* We *MUST* set SIGCHLD to SIG_DFL so that the wait4() call will
receive the signal. A different setting is inheritable */
signal (SIGCHLD, SIG_DFL);
#endif
/* Unlock the stdio streams. */
unlock_std_streams ();
gcc_init_libintl ();
diagnostic_initialize (global_dc, 0);
/* Do not invoke xcalloc before this point, since locale needs to be
set first, in case a diagnostic is issued. */
ld1_argv = XCNEWVEC (char *, argc + 4);
ld1 = CONST_CAST2 (const char **, char **, ld1_argv);
ld2_argv = XCNEWVEC (char *, argc + 11);
ld2 = CONST_CAST2 (const char **, char **, ld2_argv);
object_lst = XCNEWVEC (char *, argc);
object = CONST_CAST2 (const char **, char **, object_lst);
#ifdef DEBUG
debug = 1;
#endif
/* Parse command line early for instances of -debug. This allows
the debug flag to be set before functions like find_a_file()
are called. We also look for the -flto or -flto-partition=none flag to know
what LTO mode we are in. */
{
int i;
bool no_partition = false;
for (i = 1; argv[i] != NULL; i ++)
{
if (! strcmp (argv[i], "-debug"))
debug = true;
else if (! strcmp (argv[i], "-flto-partition=none"))
no_partition = true;
else if ((! strncmp (argv[i], "-flto=", 6)
|| ! strcmp (argv[i], "-flto")) && ! use_plugin)
lto_mode = LTO_MODE_WHOPR;
else if (!strncmp (argv[i], "-fno-lto", 8))
lto_mode = LTO_MODE_NONE;
else if (! strcmp (argv[i], "-plugin"))
{
use_plugin = true;
lto_mode = LTO_MODE_NONE;
}
#ifdef COLLECT_EXPORT_LIST
/* since -brtl, -bexport, -b64 are not position dependent
also check for them here */
if ((argv[i][0] == '-') && (argv[i][1] == 'b'))
{
arg = argv[i];
/* We want to disable automatic exports on AIX when user
explicitly puts an export list in command line */
if (arg[2] == 'E' || strncmp (&arg[2], "export", 6) == 0)
export_flag = 1;
else if (arg[2] == '6' && arg[3] == '4')
aix64_flag = 1;
else if (arg[2] == 'r' && arg[3] == 't' && arg[4] == 'l')
aixrtl_flag = 1;
}
#endif
}
vflag = debug;
if (no_partition && lto_mode == LTO_MODE_WHOPR)
lto_mode = LTO_MODE_LTO;
}
#ifndef DEFAULT_A_OUT_NAME
output_file = "a.out";
#else
output_file = DEFAULT_A_OUT_NAME;
#endif
obstack_begin (&temporary_obstack, 0);
temporary_firstobj = (char *) obstack_alloc (&temporary_obstack, 0);
#ifndef HAVE_LD_DEMANGLE
current_demangling_style = auto_demangling;
#endif
p = getenv ("COLLECT_GCC_OPTIONS");
while (p && *p)
{
const char *q = extract_string (&p);
if (*q == '-' && (q[1] == 'm' || q[1] == 'f'))
num_c_args++;
}
obstack_free (&temporary_obstack, temporary_firstobj);
/* -fno-profile-arcs -fno-test-coverage -fno-branch-probabilities
-fno-exceptions -w -fno-whole-program */
num_c_args += 6;
c_argv = XCNEWVEC (char *, num_c_args);
c_ptr = CONST_CAST2 (const char **, char **, c_argv);
if (argc < 2)
fatal_error ("no arguments");
#ifdef SIGQUIT
if (signal (SIGQUIT, SIG_IGN) != SIG_IGN)
signal (SIGQUIT, handler);
#endif
if (signal (SIGINT, SIG_IGN) != SIG_IGN)
signal (SIGINT, handler);
#ifdef SIGALRM
if (signal (SIGALRM, SIG_IGN) != SIG_IGN)
signal (SIGALRM, handler);
#endif
#ifdef SIGHUP
if (signal (SIGHUP, SIG_IGN) != SIG_IGN)
signal (SIGHUP, handler);
#endif
if (signal (SIGSEGV, SIG_IGN) != SIG_IGN)
signal (SIGSEGV, handler);
#ifdef SIGBUS
if (signal (SIGBUS, SIG_IGN) != SIG_IGN)
signal (SIGBUS, handler);
#endif
/* Extract COMPILER_PATH and PATH into our prefix list. */
prefix_from_env ("COMPILER_PATH", &cpath);
prefix_from_env ("PATH", &path);
/* Try to discover a valid linker/nm/strip to use. */
/* Maybe we know the right file to use (if not cross). */
ld_file_name = 0;
#ifdef DEFAULT_LINKER
if (access (DEFAULT_LINKER, X_OK) == 0)
ld_file_name = DEFAULT_LINKER;
if (ld_file_name == 0)
#endif
#ifdef REAL_LD_FILE_NAME
ld_file_name = find_a_file (&path, REAL_LD_FILE_NAME);
if (ld_file_name == 0)
#endif
/* Search the (target-specific) compiler dirs for ld'. */
ld_file_name = find_a_file (&cpath, real_ld_suffix);
/* Likewise for `collect-ld'. */
if (ld_file_name == 0)
ld_file_name = find_a_file (&cpath, collect_ld_suffix);
/* Search the compiler directories for `ld'. We have protection against
recursive calls in find_a_file. */
if (ld_file_name == 0)
ld_file_name = find_a_file (&cpath,
use_plugin
? plugin_ld_suffix
: ld_suffix);
/* Search the ordinary system bin directories
for `ld' (if native linking) or `TARGET-ld' (if cross). */
if (ld_file_name == 0)
ld_file_name = find_a_file (&path,
use_plugin
? full_plugin_ld_suffix
: full_ld_suffix);
#ifdef REAL_NM_FILE_NAME
nm_file_name = find_a_file (&path, REAL_NM_FILE_NAME);
if (nm_file_name == 0)
#endif
nm_file_name = find_a_file (&cpath, gnm_suffix);
if (nm_file_name == 0)
nm_file_name = find_a_file (&path, full_gnm_suffix);
if (nm_file_name == 0)
nm_file_name = find_a_file (&cpath, nm_suffix);
if (nm_file_name == 0)
nm_file_name = find_a_file (&path, full_nm_suffix);
#ifdef LDD_SUFFIX
ldd_file_name = find_a_file (&cpath, ldd_suffix);
if (ldd_file_name == 0)
ldd_file_name = find_a_file (&path, full_ldd_suffix);
#endif
#ifdef REAL_STRIP_FILE_NAME
strip_file_name = find_a_file (&path, REAL_STRIP_FILE_NAME);
if (strip_file_name == 0)
#endif
strip_file_name = find_a_file (&cpath, gstrip_suffix);
if (strip_file_name == 0)
strip_file_name = find_a_file (&path, full_gstrip_suffix);
if (strip_file_name == 0)
strip_file_name = find_a_file (&cpath, strip_suffix);
if (strip_file_name == 0)
strip_file_name = find_a_file (&path, full_strip_suffix);
/* Determine the full path name of the C compiler to use. */
c_file_name = getenv ("COLLECT_GCC");
if (c_file_name == 0)
{
#ifdef CROSS_DIRECTORY_STRUCTURE
c_file_name = concat (target_machine, "-gcc", NULL);
#else
c_file_name = "gcc";
#endif
}
p = find_a_file (&cpath, c_file_name);
/* Here it should be safe to use the system search path since we should have
already qualified the name of the compiler when it is needed. */
if (p == 0)
p = find_a_file (&path, c_file_name);
if (p)
c_file_name = p;
*ld1++ = *ld2++ = ld_file_name;
/* Make temp file names. */
c_file = make_temp_file (".c");
o_file = make_temp_file (".o");
#ifdef COLLECT_EXPORT_LIST
export_file = make_temp_file (".x");
#endif
ldout = make_temp_file (".ld");
lderrout = make_temp_file (".le");
*c_ptr++ = c_file_name;
*c_ptr++ = "-x";
*c_ptr++ = "c";
*c_ptr++ = "-c";
*c_ptr++ = "-o";
*c_ptr++ = o_file;
#ifdef COLLECT_EXPORT_LIST
/* Generate a list of directories from LIBPATH. */
prefix_from_env ("LIBPATH", &libpath_lib_dirs);
/* Add to this list also two standard directories where
AIX loader always searches for libraries. */
add_prefix (&libpath_lib_dirs, "/lib");
add_prefix (&libpath_lib_dirs, "/usr/lib");
#endif
/* Get any options that the upper GCC wants to pass to the sub-GCC.
AIX support needs to know if -shared has been specified before
parsing commandline arguments. */
p = getenv ("COLLECT_GCC_OPTIONS");
while (p && *p)
{
const char *q = extract_string (&p);
if (*q == '-' && (q[1] == 'm' || q[1] == 'f'))
*c_ptr++ = xstrdup (q);
if (strcmp (q, "-EL") == 0 || strcmp (q, "-EB") == 0)
*c_ptr++ = xstrdup (q);
if (strcmp (q, "-shared") == 0)
shared_obj = 1;
if (*q == '-' && q[1] == 'B')
{
*c_ptr++ = xstrdup (q);
if (q[2] == 0)
{
q = extract_string (&p);
*c_ptr++ = xstrdup (q);
}
}
}
obstack_free (&temporary_obstack, temporary_firstobj);
*c_ptr++ = "-fno-profile-arcs";
*c_ptr++ = "-fno-test-coverage";
*c_ptr++ = "-fno-branch-probabilities";
*c_ptr++ = "-fno-exceptions";
*c_ptr++ = "-w";
*c_ptr++ = "-fno-whole-program";
/* !!! When GCC calls collect2,
it does not know whether it is calling collect2 or ld.
So collect2 cannot meaningfully understand any options
except those ld understands.
If you propose to make GCC pass some other option,
just imagine what will happen if ld is really ld!!! */
/* Parse arguments. Remember output file spec, pass the rest to ld. */
/* After the first file, put in the c++ rt0. */
first_file = 1;
while ((arg = *++argv) != (char *) 0)
{
*ld1++ = *ld2++ = arg;
if (arg[0] == '-')
{
switch (arg[1])
{
case 'd':
if (!strcmp (arg, "-debug"))
{
/* Already parsed. */
ld1--;
ld2--;
}
if (!strcmp (arg, "-dynamic-linker") && argv[1])
{
++argv;
*ld1++ = *ld2++ = *argv;
}
break;
case 'f':
if (strncmp (arg, "-flto", 5) == 0)
{
#ifdef ENABLE_LTO
/* Do not pass LTO flag to the linker. */
ld1--;
ld2--;
#else
error ("LTO support has not been enabled in this "
"configuration");
#endif
}
#ifdef TARGET_AIX_VERSION
else
{
/* File containing a list of input files to process. */
FILE *stream;
char buf[MAXPATHLEN + 2];
/* Number of additionnal object files. */
int add_nbr = 0;
/* Maximum of additionnal object files before vector
expansion. */
int add_max = 0;
const char *list_filename = arg + 2;
/* Accept -fFILENAME and -f FILENAME. */
if (*list_filename == '\0' && argv[1])
{
++argv;
list_filename = *argv;
*ld1++ = *ld2++ = *argv;
}
stream = fopen (list_filename, "r");
if (stream == NULL)
fatal_error ("can't open %s: %m", list_filename);
while (fgets (buf, sizeof buf, stream) != NULL)
{
/* Remove end of line. */
int len = strlen (buf);
if (len >= 1 && buf[len - 1] =='\n')
buf[len - 1] = '\0';
/* Put on object vector.
Note: we only expanse vector here, so we must keep
extra space for remaining arguments. */
if (add_nbr >= add_max)
{
int pos = object - (const char **)object_lst;
add_max = (add_max == 0) ? 16 : add_max * 2;
object_lst = XRESIZEVEC (char *, object_lst,
object_nbr + add_max);
object = (const char **) object_lst + pos;
object_nbr += add_max;
}
*object++ = xstrdup (buf);
add_nbr++;
}
fclose (stream);
}
#endif
break;
case 'l':
if (first_file)
{
/* place o_file BEFORE this argument! */
first_file = 0;
ld2--;
*ld2++ = o_file;
*ld2++ = arg;
}
#ifdef COLLECT_EXPORT_LIST
{
/* Resolving full library name. */
const char *s = resolve_lib_name (arg+2);
/* Saving a full library name. */
add_to_list (&libs, s);
}
#endif
break;
#ifdef COLLECT_EXPORT_LIST
/* Saving directories where to search for libraries. */
case 'L':
add_prefix (&cmdline_lib_dirs, arg+2);
break;
#else
#if LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
case 'L':
if (is_in_args (arg,
CONST_CAST2 (const char **, char **, ld1_argv),
ld1 - 1))
--ld1;
break;
#endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
#endif
case 'o':
if (arg[2] == '\0')
output_file = *ld1++ = *ld2++ = *++argv;
else
output_file = &arg[2];
break;
case 'r':
if (arg[2] == '\0')
rflag = 1;
break;
case 's':
if (arg[2] == '\0' && do_collecting)
{
/* We must strip after the nm run, otherwise C++ linking
will not work. Thus we strip in the second ld run, or
else with strip if there is no second ld run. */
strip_flag = 1;
ld1--;
}
break;
case 'v':
if (arg[2] == '\0')
vflag = true;
break;
case '-':
if (strcmp (arg, "--no-demangle") == 0)
{
#ifndef HAVE_LD_DEMANGLE
no_demangle = 1;
ld1--;
ld2--;
#endif
}
else if (strncmp (arg, "--demangle", 10) == 0)
{
#ifndef HAVE_LD_DEMANGLE
no_demangle = 0;
if (arg[10] == '=')
{
enum demangling_styles style
= cplus_demangle_name_to_style (arg+11);
if (style == unknown_demangling)
error ("unknown demangling style '%s'", arg+11);
else
current_demangling_style = style;
}
ld1--;
ld2--;
#endif
}
else if (strncmp (arg, "--sysroot=", 10) == 0)
target_system_root = arg + 10;
else if (strcmp (arg, "--version") == 0)
vflag = true;
else if (strcmp (arg, "--help") == 0)
helpflag = true;
break;
}
}
else if ((p = strrchr (arg, '.')) != (char *) 0
&& (strcmp (p, ".o") == 0 || strcmp (p, ".a") == 0
|| strcmp (p, ".so") == 0 || strcmp (p, ".lo") == 0
|| strcmp (p, ".obj") == 0))
{
if (first_file)
{
first_file = 0;
if (p[1] == 'o')
*ld2++ = o_file;
else
{
/* place o_file BEFORE this argument! */
ld2--;
*ld2++ = o_file;
*ld2++ = arg;
}
}
if (p[1] == 'o' || p[1] == 'l')
*object++ = arg;
#ifdef COLLECT_EXPORT_LIST
/* libraries can be specified directly, i.e. without -l flag. */
else
{
/* Saving a full library name. */
add_to_list (&libs, arg);
}
#endif
}
}
#ifdef COLLECT_EXPORT_LIST
/* This is added only for debugging purposes. */
if (debug)
{
fprintf (stderr, "List of libraries:\n");
dump_list (stderr, "\t", libs.first);
}
/* The AIX linker will discard static constructors in object files if
nothing else in the file is referenced, so look at them first. Unless
we are building a shared object, ignore the eh frame tables, as we
would otherwise reference them all, hence drag all the corresponding
objects even if nothing else is referenced. */
{
const char **export_object_lst
= CONST_CAST2 (const char **, char **, object_lst);
struct id *list = libs.first;
/* Compute the filter to use from the current one, do scan, then adjust
the "current" filter to remove what we just included here. This will
control whether we need a first pass link later on or not, and what
will remain to be scanned there. */
scanfilter this_filter = ld1_filter;
#if HAVE_AS_REF
if (!shared_obj)
this_filter &= ~SCAN_DWEH;
#endif
while (export_object_lst < object)
scan_prog_file (*export_object_lst++, PASS_OBJ, this_filter);
for (; list; list = list->next)
scan_prog_file (list->name, PASS_FIRST, this_filter);
ld1_filter = ld1_filter & ~this_filter;
}
if (exports.first)
{
char *buf = concat ("-bE:", export_file, NULL);
*ld1++ = buf;
*ld2++ = buf;
exportf = fopen (export_file, "w");
if (exportf == (FILE *) 0)
fatal_error ("fopen %s: %m", export_file);
write_aix_file (exportf, exports.first);
if (fclose (exportf))
fatal_error ("fclose %s: %m", export_file);
}
#endif
*c_ptr++ = c_file;
*c_ptr = *ld1 = *object = (char *) 0;
if (vflag)
notice ("collect2 version %s\n", version_string);
if (helpflag)
{
printf ("Usage: collect2 [options]\n");
printf (" Wrap linker and generate constructor code if needed.\n");
printf (" Options:\n");
printf (" -debug Enable debug output\n");
printf (" --help Display this information\n");
printf (" -v, --version Display this program's version number\n");
printf ("\n");
printf ("Overview: http://gcc.gnu.org/onlinedocs/gccint/Collect2.html\n");
printf ("Report bugs: %s\n", bug_report_url);
printf ("\n");
}
if (debug)
{
const char *ptr;
fprintf (stderr, "ld_file_name = %s\n",
(ld_file_name ? ld_file_name : "not found"));
fprintf (stderr, "c_file_name = %s\n",
(c_file_name ? c_file_name : "not found"));
fprintf (stderr, "nm_file_name = %s\n",
(nm_file_name ? nm_file_name : "not found"));
#ifdef LDD_SUFFIX
fprintf (stderr, "ldd_file_name = %s\n",
(ldd_file_name ? ldd_file_name : "not found"));
#endif
fprintf (stderr, "strip_file_name = %s\n",
(strip_file_name ? strip_file_name : "not found"));
fprintf (stderr, "c_file = %s\n",
(c_file ? c_file : "not found"));
fprintf (stderr, "o_file = %s\n",
(o_file ? o_file : "not found"));
ptr = getenv ("COLLECT_GCC_OPTIONS");
if (ptr)
fprintf (stderr, "COLLECT_GCC_OPTIONS = %s\n", ptr);
ptr = getenv ("COLLECT_GCC");
if (ptr)
fprintf (stderr, "COLLECT_GCC = %s\n", ptr);
ptr = getenv ("COMPILER_PATH");
if (ptr)
fprintf (stderr, "COMPILER_PATH = %s\n", ptr);
ptr = getenv (LIBRARY_PATH_ENV);
if (ptr)
fprintf (stderr, "%-20s= %s\n", LIBRARY_PATH_ENV, ptr);
fprintf (stderr, "\n");
}
/* Load the program, searching all libraries and attempting to provide
undefined symbols from repository information.
If -r or they will be run via some other method, do not build the
constructor or destructor list, just return now. */
{
bool early_exit
= rflag || (! DO_COLLECT_EXPORT_LIST && ! do_collecting);
/* Perform the first pass link now, if we're about to exit or if we need
to scan for things we haven't collected yet before pursuing further.
On AIX, the latter typically includes nothing for shared objects or
frame tables for an executable, out of what the required early scan on
objects and libraries has performed above. In the !shared_obj case, we
expect the relevant tables to be dragged together with their associated
functions from precise cross reference insertions by the compiler. */
if (early_exit || ld1_filter != SCAN_NOTHING)
do_tlink (ld1_argv, object_lst);
if (early_exit)
{
#ifdef COLLECT_EXPORT_LIST
/* Make sure we delete the export file we may have created. */
if (export_file != 0 && export_file[0])
maybe_unlink (export_file);
#endif
if (lto_mode != LTO_MODE_NONE)
maybe_run_lto_and_relink (ld1_argv, object_lst, object, false);
else
post_ld_pass (false);
maybe_unlink (c_file);
maybe_unlink (o_file);
return 0;
}
}
/* Unless we have done it all already, examine the namelist and search for
static constructors and destructors to call. Write the constructor and
destructor tables to a .s file and reload. */
if (ld1_filter != SCAN_NOTHING)
scan_prog_file (output_file, PASS_FIRST, ld1_filter);
#ifdef SCAN_LIBRARIES
scan_libraries (output_file);
#endif
if (debug)
{
notice_translated (ngettext ("%d constructor found\n",
"%d constructors found\n",
constructors.number),
constructors.number);
notice_translated (ngettext ("%d destructor found\n",
"%d destructors found\n",
destructors.number),
destructors.number);
notice_translated (ngettext("%d frame table found\n",
"%d frame tables found\n",
frame_tables.number),
frame_tables.number);
}
/* If the scan exposed nothing of special interest, there's no need to
generate the glue code and relink so return now. */
if (constructors.number == 0 && destructors.number == 0
&& frame_tables.number == 0
#if defined (SCAN_LIBRARIES) || defined (COLLECT_EXPORT_LIST)
/* If we will be running these functions ourselves, we want to emit
stubs into the shared library so that we do not have to relink
dependent programs when we add static objects. */
&& ! shared_obj
#endif
)
{
/* Do tlink without additional code generation now if we didn't
do it earlier for scanning purposes. */
if (ld1_filter == SCAN_NOTHING)
do_tlink (ld1_argv, object_lst);
if (lto_mode)
maybe_run_lto_and_relink (ld1_argv, object_lst, object, false);
/* Strip now if it was requested on the command line. */
if (strip_flag)
{
char **real_strip_argv = XCNEWVEC (char *, 3);
const char ** strip_argv = CONST_CAST2 (const char **, char **,
real_strip_argv);
strip_argv[0] = strip_file_name;
strip_argv[1] = output_file;
strip_argv[2] = (char *) 0;
fork_execute ("strip", real_strip_argv);
}
#ifdef COLLECT_EXPORT_LIST
maybe_unlink (export_file);
#endif
post_ld_pass (false);
maybe_unlink (c_file);
maybe_unlink (o_file);
return 0;
}
/* Sort ctor and dtor lists by priority. */
sort_ids (&constructors);
sort_ids (&destructors);
maybe_unlink(output_file);
outf = fopen (c_file, "w");
if (outf == (FILE *) 0)
fatal_error ("fopen %s: %m", c_file);
write_c_file (outf, c_file);
if (fclose (outf))
fatal_error ("fclose %s: %m", c_file);
/* Tell the linker that we have initializer and finalizer functions. */
#ifdef LD_INIT_SWITCH
#ifdef COLLECT_EXPORT_LIST
*ld2++ = concat (LD_INIT_SWITCH, ":", initname, ":", fininame, NULL);
#else
*ld2++ = LD_INIT_SWITCH;
*ld2++ = initname;
*ld2++ = LD_FINI_SWITCH;
*ld2++ = fininame;
#endif
#endif
#ifdef COLLECT_EXPORT_LIST
if (shared_obj)
{
/* If we did not add export flag to link arguments before, add it to
second link phase now. No new exports should have been added. */
if (! exports.first)
*ld2++ = concat ("-bE:", export_file, NULL);
#ifndef LD_INIT_SWITCH
add_to_list (&exports, initname);
add_to_list (&exports, fininame);
add_to_list (&exports, "_GLOBAL__DI");
add_to_list (&exports, "_GLOBAL__DD");
#endif
exportf = fopen (export_file, "w");
if (exportf == (FILE *) 0)
fatal_error ("fopen %s: %m", export_file);
write_aix_file (exportf, exports.first);
if (fclose (exportf))
fatal_error ("fclose %s: %m", export_file);
}
#endif
/* End of arguments to second link phase. */
*ld2 = (char*) 0;
if (debug)
{
fprintf (stderr, "\n========== output_file = %s, c_file = %s\n",
output_file, c_file);
write_c_file (stderr, "stderr");
fprintf (stderr, "========== end of c_file\n\n");
#ifdef COLLECT_EXPORT_LIST
fprintf (stderr, "\n========== export_file = %s\n", export_file);
write_aix_file (stderr, exports.first);
fprintf (stderr, "========== end of export_file\n\n");
#endif
}
/* Assemble the constructor and destructor tables.
Link the tables in with the rest of the program. */
fork_execute ("gcc", c_argv);
#ifdef COLLECT_EXPORT_LIST
/* On AIX we must call tlink because of possible templates resolution. */
do_tlink (ld2_argv, object_lst);
if (lto_mode)
maybe_run_lto_and_relink (ld2_argv, object_lst, object, false);
#else
/* Otherwise, simply call ld because tlink is already done. */
if (lto_mode)
maybe_run_lto_and_relink (ld2_argv, object_lst, object, true);
else
{
fork_execute ("ld", ld2_argv);
post_ld_pass (false);
}
/* Let scan_prog_file do any final mods (OSF/rose needs this for
constructors/destructors in shared libraries. */
scan_prog_file (output_file, PASS_SECOND, SCAN_ALL);
#endif
maybe_unlink (c_file);
maybe_unlink (o_file);
#ifdef COLLECT_EXPORT_LIST
maybe_unlink (export_file);
#endif
return 0;
}
/* Wait for a process to finish, and exit if a nonzero status is found. */
int
collect_wait (const char *prog, struct pex_obj *pex)
{
int status;
if (!pex_get_status (pex, 1, &status))
fatal_error ("can't get program status: %m");
pex_free (pex);
if (status)
{
if (WIFSIGNALED (status))
{
int sig = WTERMSIG (status);
error ("%s terminated with signal %d [%s]%s",
prog, sig, strsignal(sig),
WCOREDUMP(status) ? ", core dumped" : "");
collect_exit (FATAL_EXIT_CODE);
}
if (WIFEXITED (status))
return WEXITSTATUS (status);
}
return 0;
}
static void
do_wait (const char *prog, struct pex_obj *pex)
{
int ret = collect_wait (prog, pex);
if (ret != 0)
{
error ("%s returned %d exit status", prog, ret);
collect_exit (ret);
}
if (response_file)
{
unlink (response_file);
response_file = NULL;
}
}
/* Execute a program, and wait for the reply. */
struct pex_obj *
collect_execute (const char *prog, char **argv, const char *outname,
const char *errname, int flags)
{
struct pex_obj *pex;
const char *errmsg;
int err;
char *response_arg = NULL;
char *response_argv[3] ATTRIBUTE_UNUSED;
if (HAVE_GNU_LD && at_file_supplied && argv[0] != NULL)
{
/* If using @file arguments, create a temporary file and put the
contents of argv into it. Then change argv to an array corresponding
to a single argument @FILE, where FILE is the temporary filename. */
char **current_argv = argv + 1;
char *argv0 = argv[0];
int status;
FILE *f;
/* Note: we assume argv contains at least one element; this is
checked above. */
response_file = make_temp_file ("");
f = fopen (response_file, "w");
if (f == NULL)
fatal_error ("could not open response file %s", response_file);
status = writeargv (current_argv, f);
if (status)
fatal_error ("could not write to response file %s", response_file);
status = fclose (f);
if (EOF == status)
fatal_error ("could not close response file %s", response_file);
response_arg = concat ("@", response_file, NULL);
response_argv[0] = argv0;
response_argv[1] = response_arg;
response_argv[2] = NULL;
argv = response_argv;
}
if (vflag || debug)
{
char **p_argv;
const char *str;
if (argv[0])
fprintf (stderr, "%s", argv[0]);
else
notice ("[cannot find %s]", prog);
for (p_argv = &argv[1]; (str = *p_argv) != (char *) 0; p_argv++)
fprintf (stderr, " %s", str);
fprintf (stderr, "\n");
}
fflush (stdout);
fflush (stderr);
/* If we cannot find a program we need, complain error. Do this here
since we might not end up needing something that we could not find. */
if (argv[0] == 0)
fatal_error ("cannot find '%s'", prog);
pex = pex_init (0, "collect2", NULL);
if (pex == NULL)
fatal_error ("pex_init failed: %m");
errmsg = pex_run (pex, flags, argv[0], argv, outname,
errname, &err);
if (errmsg != NULL)
{
if (err != 0)
{
errno = err;
fatal_error ("%s: %m", _(errmsg));
}
else
fatal_error (errmsg);
}
free (response_arg);
return pex;
}
static void
fork_execute (const char *prog, char **argv)
{
struct pex_obj *pex;
pex = collect_execute (prog, argv, NULL, NULL, PEX_LAST | PEX_SEARCH);
do_wait (prog, pex);
}
/* Unlink a file unless we are debugging. */
static void
maybe_unlink (const char *file)
{
if (!debug)
unlink_if_ordinary (file);
else
notice ("[Leaving %s]\n", file);
}
/* Call maybe_unlink on the NULL-terminated list, FILE_LIST. */
static void
maybe_unlink_list (char **file_list)
{
char **tmp = file_list;
while (*tmp)
maybe_unlink (*(tmp++));
}
static long sequence_number = 0;
/* Add a name to a linked list. */
static void
add_to_list (struct head *head_ptr, const char *name)
{
struct id *newid
= (struct id *) xcalloc (sizeof (struct id) + strlen (name), 1);
struct id *p;
strcpy (newid->name, name);
if (head_ptr->first)
head_ptr->last->next = newid;
else
head_ptr->first = newid;
/* Check for duplicate symbols. */
for (p = head_ptr->first;
strcmp (name, p->name) != 0;
p = p->next)
;
if (p != newid)
{
head_ptr->last->next = 0;
free (newid);
return;
}
newid->sequence = ++sequence_number;
head_ptr->last = newid;
head_ptr->number++;
}
/* Grab the init priority number from an init function name that
looks like "_GLOBAL_.I.12345.foo". */
static int
extract_init_priority (const char *name)
{
int pos = 0, pri;
while (name[pos] == '_')
++pos;
pos += 10; /* strlen ("GLOBAL__X_") */
/* Extract init_p number from ctor/dtor name. */
pri = atoi (name + pos);
return pri ? pri : DEFAULT_INIT_PRIORITY;
}
/* Insertion sort the ids from ctor/dtor list HEAD_PTR in descending order.
ctors will be run from right to left, dtors from left to right. */
static void
sort_ids (struct head *head_ptr)
{
/* id holds the current element to insert. id_next holds the next
element to insert. id_ptr iterates through the already sorted elements
looking for the place to insert id. */
struct id *id, *id_next, **id_ptr;
id = head_ptr->first;
/* We don't have any sorted elements yet. */
head_ptr->first = NULL;
for (; id; id = id_next)
{
id_next = id->next;
id->sequence = extract_init_priority (id->name);
for (id_ptr = &(head_ptr->first); ; id_ptr = &((*id_ptr)->next))
if (*id_ptr == NULL
/* If the sequence numbers are the same, we put the id from the
file later on the command line later in the list. */
|| id->sequence > (*id_ptr)->sequence
/* Hack: do lexical compare, too.
|| (id->sequence == (*id_ptr)->sequence
&& strcmp (id->name, (*id_ptr)->name) > 0) */
)
{
id->next = *id_ptr;
*id_ptr = id;
break;
}
}
/* Now set the sequence numbers properly so write_c_file works. */
for (id = head_ptr->first; id; id = id->next)
id->sequence = ++sequence_number;
}
/* Write: `prefix', the names on list LIST, `suffix'. */
static void
write_list (FILE *stream, const char *prefix, struct id *list)
{
while (list)
{
fprintf (stream, "%sx%d,\n", prefix, list->sequence);
list = list->next;
}
}
#if LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
/* Given a STRING, return nonzero if it occurs in the list in range
[ARGS_BEGIN,ARGS_END). */
static int
is_in_args (const char *string, const char **args_begin,
const char **args_end)
{
const char **args_pointer;
for (args_pointer = args_begin; args_pointer != args_end; ++args_pointer)
if (strcmp (string, *args_pointer) == 0)
return 1;
return 0;
}
#endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
#ifdef COLLECT_EXPORT_LIST
/* This function is really used only on AIX, but may be useful. */
#if 0
static int
is_in_list (const char *prefix, struct id *list)
{
while (list)
{
if (!strcmp (prefix, list->name)) return 1;
list = list->next;
}
return 0;
}
#endif
#endif /* COLLECT_EXPORT_LIST */
/* Added for debugging purpose. */
#ifdef COLLECT_EXPORT_LIST
static void
dump_list (FILE *stream, const char *prefix, struct id *list)
{
while (list)
{
fprintf (stream, "%s%s,\n", prefix, list->name);
list = list->next;
}
}
#endif
#if 0
static void
dump_prefix_list (FILE *stream, const char *prefix, struct prefix_list *list)
{
while (list)
{
fprintf (stream, "%s%s,\n", prefix, list->prefix);
list = list->next;
}
}
#endif
static void
write_list_with_asm (FILE *stream, const char *prefix, struct id *list)
{
while (list)
{
fprintf (stream, "%sx%d __asm__ (\"%s\");\n",
prefix, list->sequence, list->name);
list = list->next;
}
}
/* Write out the constructor and destructor tables statically (for a shared
object), along with the functions to execute them. */
static void
write_c_file_stat (FILE *stream, const char *name ATTRIBUTE_UNUSED)
{
const char *p, *q;
char *prefix, *r;
int frames = (frame_tables.number > 0);
/* Figure out name of output_file, stripping off .so version. */
q = p = lbasename (output_file);
while (q)
{
q = strchr (q,'.');
if (q == 0)
{
q = p + strlen (p);
break;
}
else
{
if (filename_ncmp (q, SHLIB_SUFFIX, strlen (SHLIB_SUFFIX)) == 0)
{
q += strlen (SHLIB_SUFFIX);
break;
}
else
q++;
}
}
/* q points to null at end of the string (or . of the .so version) */
prefix = XNEWVEC (char, q - p + 1);
strncpy (prefix, p, q - p);
prefix[q - p] = 0;
for (r = prefix; *r; r++)
if (!ISALNUM ((unsigned char)*r))
*r = '_';
if (debug)
notice ("\nwrite_c_file - output name is %s, prefix is %s\n",
output_file, prefix);
initname = concat ("_GLOBAL__FI_", prefix, NULL);
fininame = concat ("_GLOBAL__FD_", prefix, NULL);
free (prefix);
/* Write the tables as C code. */
fprintf (stream, "static int count;\n");
fprintf (stream, "typedef void entry_pt();\n");
write_list_with_asm (stream, "extern entry_pt ", constructors.first);
if (frames)
{
write_list_with_asm (stream, "extern void *", frame_tables.first);
fprintf (stream, "\tstatic void *frame_table[] = {\n");
write_list (stream, "\t\t&", frame_tables.first);
fprintf (stream, "\t0\n};\n");
/* This must match what's in frame.h. */
fprintf (stream, "struct object {\n");
fprintf (stream, " void *pc_begin;\n");
fprintf (stream, " void *pc_end;\n");
fprintf (stream, " void *fde_begin;\n");
fprintf (stream, " void *fde_array;\n");
fprintf (stream, " __SIZE_TYPE__ count;\n");
fprintf (stream, " struct object *next;\n");
fprintf (stream, "};\n");
fprintf (stream, "extern void __register_frame_info_table (void *, struct object *);\n");
fprintf (stream, "extern void *__deregister_frame_info (void *);\n");
fprintf (stream, "static void reg_frame () {\n");
fprintf (stream, "\tstatic struct object ob;\n");
fprintf (stream, "\t__register_frame_info_table (frame_table, &ob);\n");
fprintf (stream, "\t}\n");
fprintf (stream, "static void dereg_frame () {\n");
fprintf (stream, "\t__deregister_frame_info (frame_table);\n");
fprintf (stream, "\t}\n");
}
fprintf (stream, "void %s() {\n", initname);
if (constructors.number > 0 || frames)
{
fprintf (stream, "\tstatic entry_pt *ctors[] = {\n");
write_list (stream, "\t\t", constructors.first);
if (frames)
fprintf (stream, "\treg_frame,\n");
fprintf (stream, "\t};\n");
fprintf (stream, "\tentry_pt **p;\n");
fprintf (stream, "\tif (count++ != 0) return;\n");
fprintf (stream, "\tp = ctors + %d;\n", constructors.number + frames);
fprintf (stream, "\twhile (p > ctors) (*--p)();\n");
}
else
fprintf (stream, "\t++count;\n");
fprintf (stream, "}\n");
write_list_with_asm (stream, "extern entry_pt ", destructors.first);
fprintf (stream, "void %s() {\n", fininame);
if (destructors.number > 0 || frames)
{
fprintf (stream, "\tstatic entry_pt *dtors[] = {\n");
write_list (stream, "\t\t", destructors.first);
if (frames)
fprintf (stream, "\tdereg_frame,\n");
fprintf (stream, "\t};\n");
fprintf (stream, "\tentry_pt **p;\n");
fprintf (stream, "\tif (--count != 0) return;\n");
fprintf (stream, "\tp = dtors;\n");
fprintf (stream, "\twhile (p < dtors + %d) (*p++)();\n",
destructors.number + frames);
}
fprintf (stream, "}\n");
if (shared_obj)
{
COLLECT_SHARED_INIT_FUNC(stream, initname);
COLLECT_SHARED_FINI_FUNC(stream, fininame);
}
}
/* Write the constructor/destructor tables. */
#ifndef LD_INIT_SWITCH
static void
write_c_file_glob (FILE *stream, const char *name ATTRIBUTE_UNUSED)
{
/* Write the tables as C code. */
int frames = (frame_tables.number > 0);
fprintf (stream, "typedef void entry_pt();\n\n");
write_list_with_asm (stream, "extern entry_pt ", constructors.first);
if (frames)
{
write_list_with_asm (stream, "extern void *", frame_tables.first);
fprintf (stream, "\tstatic void *frame_table[] = {\n");
write_list (stream, "\t\t&", frame_tables.first);
fprintf (stream, "\t0\n};\n");
/* This must match what's in frame.h. */
fprintf (stream, "struct object {\n");
fprintf (stream, " void *pc_begin;\n");
fprintf (stream, " void *pc_end;\n");
fprintf (stream, " void *fde_begin;\n");
fprintf (stream, " void *fde_array;\n");
fprintf (stream, " __SIZE_TYPE__ count;\n");
fprintf (stream, " struct object *next;\n");
fprintf (stream, "};\n");
fprintf (stream, "extern void __register_frame_info_table (void *, struct object *);\n");
fprintf (stream, "extern void *__deregister_frame_info (void *);\n");
fprintf (stream, "static void reg_frame () {\n");
fprintf (stream, "\tstatic struct object ob;\n");
fprintf (stream, "\t__register_frame_info_table (frame_table, &ob);\n");
fprintf (stream, "\t}\n");
fprintf (stream, "static void dereg_frame () {\n");
fprintf (stream, "\t__deregister_frame_info (frame_table);\n");
fprintf (stream, "\t}\n");
}
fprintf (stream, "\nentry_pt * __CTOR_LIST__[] = {\n");
fprintf (stream, "\t(entry_pt *) %d,\n", constructors.number + frames);
write_list (stream, "\t", constructors.first);
if (frames)
fprintf (stream, "\treg_frame,\n");
fprintf (stream, "\t0\n};\n\n");
write_list_with_asm (stream, "extern entry_pt ", destructors.first);
fprintf (stream, "\nentry_pt * __DTOR_LIST__[] = {\n");
fprintf (stream, "\t(entry_pt *) %d,\n", destructors.number + frames);
write_list (stream, "\t", destructors.first);
if (frames)
fprintf (stream, "\tdereg_frame,\n");
fprintf (stream, "\t0\n};\n\n");
fprintf (stream, "extern entry_pt %s;\n", NAME__MAIN);
fprintf (stream, "entry_pt *__main_reference = %s;\n\n", NAME__MAIN);
}
#endif /* ! LD_INIT_SWITCH */
static void
write_c_file (FILE *stream, const char *name)
{
#ifndef LD_INIT_SWITCH
if (! shared_obj)
write_c_file_glob (stream, name);
else
#endif
write_c_file_stat (stream, name);
}
#ifdef COLLECT_EXPORT_LIST
static void
write_aix_file (FILE *stream, struct id *list)
{
for (; list; list = list->next)
{
fputs (list->name, stream);
putc ('\n', stream);
}
}
#endif
#ifdef OBJECT_FORMAT_NONE
/* Check to make sure the file is an LTO object file. */
static bool
maybe_lto_object_file (const char *prog_name)
{
FILE *f;
unsigned char buf[4];
int i;
static unsigned char elfmagic[4] = { 0x7f, 'E', 'L', 'F' };
static unsigned char coffmagic[2] = { 0x4c, 0x01 };
static unsigned char coffmagic_x64[2] = { 0x64, 0x86 };
static unsigned char machomagic[4][4] = {
{ 0xcf, 0xfa, 0xed, 0xfe },
{ 0xce, 0xfa, 0xed, 0xfe },
{ 0xfe, 0xed, 0xfa, 0xcf },
{ 0xfe, 0xed, 0xfa, 0xce }
};
f = fopen (prog_name, "rb");
if (f == NULL)
return false;
if (fread (buf, sizeof (buf), 1, f) != 1)
buf[0] = 0;
fclose (f);
if (memcmp (buf, elfmagic, sizeof (elfmagic)) == 0
|| memcmp (buf, coffmagic, sizeof (coffmagic)) == 0
|| memcmp (buf, coffmagic_x64, sizeof (coffmagic_x64)) == 0)
return true;
for (i = 0; i < 4; i++)
if (memcmp (buf, machomagic[i], sizeof (machomagic[i])) == 0)
return true;
return false;
}
/* Generic version to scan the name list of the loaded program for
the symbols g++ uses for static constructors and destructors. */
static void
scan_prog_file (const char *prog_name, scanpass which_pass,
scanfilter filter)
{
void (*int_handler) (int);
#ifdef SIGQUIT
void (*quit_handler) (int);
#endif
char *real_nm_argv[4];
const char **nm_argv = CONST_CAST2 (const char **, char**, real_nm_argv);
int argc = 0;
struct pex_obj *pex;
const char *errmsg;
int err;
char *p, buf[1024];
FILE *inf;
int found_lto = 0;
if (which_pass == PASS_SECOND)
return;
/* LTO objects must be in a known format. This check prevents
us from accepting an archive containing LTO objects, which
gcc cannnot currently handle. */
if (which_pass == PASS_LTOINFO && !maybe_lto_object_file (prog_name))
return;
/* If we do not have an `nm', complain. */
if (nm_file_name == 0)
fatal_error ("cannot find 'nm'");
nm_argv[argc++] = nm_file_name;
if (NM_FLAGS[0] != '\0')
nm_argv[argc++] = NM_FLAGS;
nm_argv[argc++] = prog_name;
nm_argv[argc++] = (char *) 0;
/* Trace if needed. */
if (vflag)
{
const char **p_argv;
const char *str;
for (p_argv = &nm_argv[0]; (str = *p_argv) != (char *) 0; p_argv++)
fprintf (stderr, " %s", str);
fprintf (stderr, "\n");
}
fflush (stdout);
fflush (stderr);
pex = pex_init (PEX_USE_PIPES, "collect2", NULL);
if (pex == NULL)
fatal_error ("pex_init failed: %m");
errmsg = pex_run (pex, 0, nm_file_name, real_nm_argv, NULL, HOST_BIT_BUCKET,
&err);
if (errmsg != NULL)
{
if (err != 0)
{
errno = err;
fatal_error ("%s: %m", _(errmsg));
}
else
fatal_error (errmsg);
}
int_handler = (void (*) (int)) signal (SIGINT, SIG_IGN);
#ifdef SIGQUIT
quit_handler = (void (*) (int)) signal (SIGQUIT, SIG_IGN);
#endif
inf = pex_read_output (pex, 0);
if (inf == NULL)
fatal_error ("can't open nm output: %m");
if (debug)
{
if (which_pass == PASS_LTOINFO)
fprintf (stderr, "\nnm output with LTO info marker symbol.\n");
else
fprintf (stderr, "\nnm output with constructors/destructors.\n");
}
/* Read each line of nm output. */
while (fgets (buf, sizeof buf, inf) != (char *) 0)
{
int ch, ch2;
char *name, *end;
if (debug)
fprintf (stderr, "\t%s\n", buf);
if (which_pass == PASS_LTOINFO)
{
if (found_lto)
continue;
/* Look for the LTO info marker symbol, and add filename to
the LTO objects list if found. */
for (p = buf; (ch = *p) != '\0' && ch != '\n'; p++)
if (ch == ' ' && p[1] == '_' && p[2] == '_'
&& (strncmp (p + (p[3] == '_' ? 2 : 1), "__gnu_lto_v1", 12) == 0)
&& ISSPACE (p[p[3] == '_' ? 14 : 13]))
{
add_lto_object (&lto_objects, prog_name);
/* We need to read all the input, so we can't just
return here. But we can avoid useless work. */
found_lto = 1;
break;
}
continue;
}
/* If it contains a constructor or destructor name, add the name
to the appropriate list unless this is a kind of symbol we're
not supposed to even consider. */
for (p = buf; (ch = *p) != '\0' && ch != '\n' && ch != '_'; p++)
if (ch == ' ' && p[1] == 'U' && p[2] == ' ')
break;
if (ch != '_')
continue;
name = p;
/* Find the end of the symbol name.
Do not include `|', because Encore nm can tack that on the end. */
for (end = p; (ch2 = *end) != '\0' && !ISSPACE (ch2) && ch2 != '|';
end++)
continue;
*end = '\0';
switch (is_ctor_dtor (name))
{
case SYM_CTOR:
if (! (filter & SCAN_CTOR))
break;
if (which_pass != PASS_LIB)
add_to_list (&constructors, name);
break;
case SYM_DTOR:
if (! (filter & SCAN_DTOR))
break;
if (which_pass != PASS_LIB)
add_to_list (&destructors, name);
break;
case SYM_INIT:
if (! (filter & SCAN_INIT))
break;
if (which_pass != PASS_LIB)
fatal_error ("init function found in object %s", prog_name);
#ifndef LD_INIT_SWITCH
add_to_list (&constructors, name);
#endif
break;
case SYM_FINI:
if (! (filter & SCAN_FINI))
break;
if (which_pass != PASS_LIB)
fatal_error ("fini function found in object %s", prog_name);
#ifndef LD_FINI_SWITCH
add_to_list (&destructors, name);
#endif
break;
case SYM_DWEH:
if (! (filter & SCAN_DWEH))
break;
if (which_pass != PASS_LIB)
add_to_list (&frame_tables, name);
break;
default: /* not a constructor or destructor */
continue;
}
}
if (debug)
fprintf (stderr, "\n");
do_wait (nm_file_name, pex);
signal (SIGINT, int_handler);
#ifdef SIGQUIT
signal (SIGQUIT, quit_handler);
#endif
}
#ifdef LDD_SUFFIX
/* Use the List Dynamic Dependencies program to find shared libraries that
the output file depends upon and their initialization/finalization
routines, if any. */
static void
scan_libraries (const char *prog_name)
{
static struct head libraries; /* list of shared libraries found */
struct id *list;
void (*int_handler) (int);
#ifdef SIGQUIT
void (*quit_handler) (int);
#endif
char *real_ldd_argv[4];
const char **ldd_argv = CONST_CAST2 (const char **, char **, real_ldd_argv);
int argc = 0;
struct pex_obj *pex;
const char *errmsg;
int err;
char buf[1024];
FILE *inf;
/* If we do not have an `ldd', complain. */
if (ldd_file_name == 0)
{
error ("cannot find 'ldd'");
return;
}
ldd_argv[argc++] = ldd_file_name;
ldd_argv[argc++] = prog_name;
ldd_argv[argc++] = (char *) 0;
/* Trace if needed. */
if (vflag)
{
const char **p_argv;
const char *str;
for (p_argv = &ldd_argv[0]; (str = *p_argv) != (char *) 0; p_argv++)
fprintf (stderr, " %s", str);
fprintf (stderr, "\n");
}
fflush (stdout);
fflush (stderr);
pex = pex_init (PEX_USE_PIPES, "collect2", NULL);
if (pex == NULL)
fatal_error ("pex_init failed: %m");
errmsg = pex_run (pex, 0, ldd_file_name, real_ldd_argv, NULL, NULL, &err);
if (errmsg != NULL)
{
if (err != 0)
{
errno = err;
fatal_error ("%s: %m", _(errmsg));
}
else
fatal_error (errmsg);
}
int_handler = (void (*) (int)) signal (SIGINT, SIG_IGN);
#ifdef SIGQUIT
quit_handler = (void (*) (int)) signal (SIGQUIT, SIG_IGN);
#endif
inf = pex_read_output (pex, 0);
if (inf == NULL)
fatal_error ("can't open ldd output: %m");
if (debug)
notice ("\nldd output with constructors/destructors.\n");
/* Read each line of ldd output. */
while (fgets (buf, sizeof buf, inf) != (char *) 0)
{
int ch2;
char *name, *end, *p = buf;
/* Extract names of libraries and add to list. */
PARSE_LDD_OUTPUT (p);
if (p == 0)
continue;
name = p;
if (strncmp (name, "not found", sizeof ("not found") - 1) == 0)
fatal_error ("dynamic dependency %s not found", buf);
/* Find the end of the symbol name. */
for (end = p;
(ch2 = *end) != '\0' && ch2 != '\n' && !ISSPACE (ch2) && ch2 != '|';
end++)
continue;
*end = '\0';
if (access (name, R_OK) == 0)
add_to_list (&libraries, name);
else
fatal_error ("unable to open dynamic dependency '%s'", buf);
if (debug)
fprintf (stderr, "\t%s\n", buf);
}
if (debug)
fprintf (stderr, "\n");
do_wait (ldd_file_name, pex);
signal (SIGINT, int_handler);
#ifdef SIGQUIT
signal (SIGQUIT, quit_handler);
#endif
/* Now iterate through the library list adding their symbols to
the list. */
for (list = libraries.first; list; list = list->next)
scan_prog_file (list->name, PASS_LIB, SCAN_ALL);
}
#endif /* LDD_SUFFIX */
#endif /* OBJECT_FORMAT_NONE */
/*
* COFF specific stuff.
*/
#ifdef OBJECT_FORMAT_COFF
#if defined (EXTENDED_COFF)
# define GCC_SYMBOLS(X) (SYMHEADER(X).isymMax + SYMHEADER(X).iextMax)
# define GCC_SYMENT SYMR
# define GCC_OK_SYMBOL(X) ((X).st == stProc || (X).st == stGlobal)
# define GCC_SYMINC(X) (1)
# define GCC_SYMZERO(X) (SYMHEADER(X).isymMax)
# define GCC_CHECK_HDR(X) (PSYMTAB(X) != 0)
#else
# define GCC_SYMBOLS(X) (HEADER(ldptr).f_nsyms)
# define GCC_SYMENT SYMENT
# if defined (C_WEAKEXT)
# define GCC_OK_SYMBOL(X) \
(((X).n_sclass == C_EXT || (X).n_sclass == C_WEAKEXT) && \
((X).n_scnum > N_UNDEF) && \
(aix64_flag \
|| (((X).n_type & N_TMASK) == (DT_NON << N_BTSHFT) \
|| ((X).n_type & N_TMASK) == (DT_FCN << N_BTSHFT))))
# define GCC_UNDEF_SYMBOL(X) \
(((X).n_sclass == C_EXT || (X).n_sclass == C_WEAKEXT) && \
((X).n_scnum == N_UNDEF))
# else
# define GCC_OK_SYMBOL(X) \
(((X).n_sclass == C_EXT) && \
((X).n_scnum > N_UNDEF) && \
(aix64_flag \
|| (((X).n_type & N_TMASK) == (DT_NON << N_BTSHFT) \
|| ((X).n_type & N_TMASK) == (DT_FCN << N_BTSHFT))))
# define GCC_UNDEF_SYMBOL(X) \
(((X).n_sclass == C_EXT) && ((X).n_scnum == N_UNDEF))
# endif
# define GCC_SYMINC(X) ((X).n_numaux+1)
# define GCC_SYMZERO(X) 0
/* 0757 = U803XTOCMAGIC (AIX 4.3) and 0767 = U64_TOCMAGIC (AIX V5) */
#if TARGET_AIX_VERSION >= 51
# define GCC_CHECK_HDR(X) \
((HEADER (X).f_magic == U802TOCMAGIC && ! aix64_flag) \
|| (HEADER (X).f_magic == 0767 && aix64_flag))
#else
# define GCC_CHECK_HDR(X) \
((HEADER (X).f_magic == U802TOCMAGIC && ! aix64_flag) \
|| (HEADER (X).f_magic == 0757 && aix64_flag))
#endif
#endif
#ifdef COLLECT_EXPORT_LIST
/* Array of standard AIX libraries which should not
be scanned for ctors/dtors. */
static const char *const aix_std_libs[] = {
"/unix",
"/lib/libc.a",
"/lib/libm.a",
"/lib/libc_r.a",
"/lib/libm_r.a",
"/usr/lib/libc.a",
"/usr/lib/libm.a",
"/usr/lib/libc_r.a",
"/usr/lib/libm_r.a",
"/usr/lib/threads/libc.a",
"/usr/ccs/lib/libc.a",
"/usr/ccs/lib/libm.a",
"/usr/ccs/lib/libc_r.a",
"/usr/ccs/lib/libm_r.a",
NULL
};
/* This function checks the filename and returns 1
if this name matches the location of a standard AIX library. */
static int ignore_library (const char *);
static int
ignore_library (const char *name)
{
const char *const *p;
size_t length;
if (target_system_root[0] != '\0')
{
length = strlen (target_system_root);
if (strncmp (name, target_system_root, length) != 0)
return 0;
name += length;
}
for (p = &aix_std_libs[0]; *p != NULL; ++p)
if (strcmp (name, *p) == 0)
return 1;
return 0;
}
#endif /* COLLECT_EXPORT_LIST */
#if defined (HAVE_DECL_LDGETNAME) && !HAVE_DECL_LDGETNAME
extern char *ldgetname (LDFILE *, GCC_SYMENT *);
#endif
/* COFF version to scan the name list of the loaded program for
the symbols g++ uses for static constructors and destructors. */
static void
scan_prog_file (const char *prog_name, scanpass which_pass,
scanfilter filter)
{
LDFILE *ldptr = NULL;
int sym_index, sym_count;
int is_shared = 0;
if (which_pass != PASS_FIRST && which_pass != PASS_OBJ)
return;
#ifdef COLLECT_EXPORT_LIST
/* We do not need scanning for some standard C libraries. */
if (which_pass == PASS_FIRST && ignore_library (prog_name))
return;
/* On AIX we have a loop, because there is not much difference
between an object and an archive. This trick allows us to
eliminate scan_libraries() function. */
do
{
#endif
/* Some platforms (e.g. OSF4) declare ldopen as taking a
non-const char * filename parameter, even though it will not
modify that string. So we must cast away const-ness here,
using CONST_CAST to prevent complaints from -Wcast-qual. */
if ((ldptr = ldopen (CONST_CAST (char *, prog_name), ldptr)) != NULL)
{
if (! MY_ISCOFF (HEADER (ldptr).f_magic))
fatal_error ("%s: not a COFF file", prog_name);
if (GCC_CHECK_HDR (ldptr))
{
sym_count = GCC_SYMBOLS (ldptr);
sym_index = GCC_SYMZERO (ldptr);
#ifdef COLLECT_EXPORT_LIST
/* Is current archive member a shared object? */
is_shared = HEADER (ldptr).f_flags & F_SHROBJ;
#endif
while (sym_index < sym_count)
{
GCC_SYMENT symbol;
if (ldtbread (ldptr, sym_index, &symbol) <= 0)
break;
sym_index += GCC_SYMINC (symbol);
if (GCC_OK_SYMBOL (symbol))
{
char *name;
if ((name = ldgetname (ldptr, &symbol)) == NULL)
continue; /* Should never happen. */
#ifdef XCOFF_DEBUGGING_INFO
/* All AIX function names have a duplicate entry
beginning with a dot. */
if (*name == '.')
++name;
#endif
switch (is_ctor_dtor (name))
{
case SYM_CTOR:
if (! (filter & SCAN_CTOR))
break;
if (! is_shared)
add_to_list (&constructors, name);
#if defined (COLLECT_EXPORT_LIST) && !defined (LD_INIT_SWITCH)
if (which_pass == PASS_OBJ)
add_to_list (&exports, name);
#endif
break;
case SYM_DTOR:
if (! (filter & SCAN_DTOR))
break;
if (! is_shared)
add_to_list (&destructors, name);
#if defined (COLLECT_EXPORT_LIST) && !defined (LD_INIT_SWITCH)
if (which_pass == PASS_OBJ)
add_to_list (&exports, name);
#endif
break;
#ifdef COLLECT_EXPORT_LIST
case SYM_INIT:
if (! (filter & SCAN_INIT))
break;
#ifndef LD_INIT_SWITCH
if (is_shared)
add_to_list (&constructors, name);
#endif
break;
case SYM_FINI:
if (! (filter & SCAN_FINI))
break;
#ifndef LD_INIT_SWITCH
if (is_shared)
add_to_list (&destructors, name);
#endif
break;
#endif
case SYM_DWEH:
if (! (filter & SCAN_DWEH))
break;
if (! is_shared)
add_to_list (&frame_tables, name);
#if defined (COLLECT_EXPORT_LIST) && !defined (LD_INIT_SWITCH)
if (which_pass == PASS_OBJ)
add_to_list (&exports, name);
#endif
break;
default: /* not a constructor or destructor */
#ifdef COLLECT_EXPORT_LIST
/* Explicitly export all global symbols when
building a shared object on AIX, but do not
re-export symbols from another shared object
and do not export symbols if the user
provides an explicit export list. */
if (shared_obj && !is_shared
&& which_pass == PASS_OBJ && !export_flag)
add_to_list (&exports, name);
#endif
continue;
}
if (debug)
#if !defined(EXTENDED_COFF)
fprintf (stderr, "\tsec=%d class=%d type=%s%o %s\n",
symbol.n_scnum, symbol.n_sclass,
(symbol.n_type ? "0" : ""), symbol.n_type,
name);
#else
fprintf (stderr,
"\tiss = %5d, value = %5ld, index = %5d, name = %s\n",
symbol.iss, (long) symbol.value, symbol.index, name);
#endif
}
}
}
#ifdef COLLECT_EXPORT_LIST
else
{
/* If archive contains both 32-bit and 64-bit objects,
we want to skip objects in other mode so mismatch normal. */
if (debug)
fprintf (stderr, "%s : magic=%o aix64=%d mismatch\n",
prog_name, HEADER (ldptr).f_magic, aix64_flag);
}
#endif
}
else
{
fatal_error ("%s: cannot open as COFF file", prog_name);
}
#ifdef COLLECT_EXPORT_LIST
/* On AIX loop continues while there are more members in archive. */
}
while (ldclose (ldptr) == FAILURE);
#else
/* Otherwise we simply close ldptr. */
(void) ldclose(ldptr);
#endif
}
#endif /* OBJECT_FORMAT_COFF */
#ifdef COLLECT_EXPORT_LIST
/* Given a library name without "lib" prefix, this function
returns a full library name including a path. */
static char *
resolve_lib_name (const char *name)
{
char *lib_buf;
int i, j, l = 0;
/* Library extensions for AIX dynamic linking. */
const char * const libexts[2] = {"a", "so"};
for (i = 0; libpaths[i]; i++)
if (libpaths[i]->max_len > l)
l = libpaths[i]->max_len;
lib_buf = XNEWVEC (char, l + strlen(name) + 10);
for (i = 0; libpaths[i]; i++)
{
struct prefix_list *list = libpaths[i]->plist;
for (; list; list = list->next)
{
/* The following lines are needed because path_prefix list
may contain directories both with trailing DIR_SEPARATOR and
without it. */
const char *p = "";
if (!IS_DIR_SEPARATOR (list->prefix[strlen(list->prefix)-1]))
p = "/";
for (j = 0; j < 2; j++)
{
sprintf (lib_buf, "%s%slib%s.%s",
list->prefix, p, name,
libexts[(j + aixrtl_flag) % 2]);
if (debug) fprintf (stderr, "searching for: %s\n", lib_buf);
if (file_exists (lib_buf))
{
if (debug) fprintf (stderr, "found: %s\n", lib_buf);
return (lib_buf);
}
}
}
}
if (debug)
fprintf (stderr, "not found\n");
else
fatal_error ("library lib%s not found", name);
return (NULL);
}
#endif /* COLLECT_EXPORT_LIST */
#ifdef COLLECT_RUN_DSYMUTIL
static int flag_dsym = false;
static int flag_idsym = false;
static void
process_args (int *argcp, char **argv) {
int i, j;
int argc = *argcp;
for (i=0; i<argc; ++i)
{
if (strcmp (argv[i], "-dsym") == 0)
{
flag_dsym = true;
/* Remove the flag, as we handle all processing for it. */
j = i;
do
argv[j] = argv[j+1];
while (++j < argc);
--i;
argc = --(*argcp);
}
else if (strcmp (argv[i], "-idsym") == 0)
{
flag_idsym = true;
/* Remove the flag, as we handle all processing for it. */
j = i;
do
argv[j] = argv[j+1];
while (++j < argc);
--i;
argc = --(*argcp);
}
}
}
static void
do_dsymutil (const char *output_file) {
const char *dsymutil = DSYMUTIL + 1;
struct pex_obj *pex;
char **real_argv = XCNEWVEC (char *, 3);
const char ** argv = CONST_CAST2 (const char **, char **,
real_argv);
argv[0] = dsymutil;
argv[1] = output_file;
argv[2] = (char *) 0;
pex = collect_execute (dsymutil, real_argv, NULL, NULL, PEX_LAST | PEX_SEARCH);
do_wait (dsymutil, pex);
}
static void
post_ld_pass (bool temp_file) {
if (!(temp_file && flag_idsym) && !flag_dsym)
return;
do_dsymutil (output_file);
}
#else
static void
process_args (int *argcp ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED) { }
static void post_ld_pass (bool temp_file ATTRIBUTE_UNUSED) { }
#endif
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