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[Emacs-diffs] Changes to emacs/gc/dyn_load.c [Boehm-versions]
|
From: |
Dave Love |
|
Subject: |
[Emacs-diffs] Changes to emacs/gc/dyn_load.c [Boehm-versions] |
|
Date: |
Mon, 16 Jun 2003 11:19:57 -0400 |
Index: emacs/gc/dyn_load.c
diff -c /dev/null emacs/gc/dyn_load.c:1.2.2.1.2.1
*** /dev/null Mon Jun 16 11:19:57 2003
--- emacs/gc/dyn_load.c Mon Jun 16 11:19:52 2003
***************
*** 0 ****
--- 1,1146 ----
+ /*
+ * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
+ * Copyright (c) 1997 by Silicon Graphics. All rights reserved.
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ *
+ * Original author: Bill Janssen
+ * Heavily modified by Hans Boehm and others
+ */
+
+ /*
+ * This is incredibly OS specific code for tracking down data sections in
+ * dynamic libraries. There appears to be no way of doing this quickly
+ * without groveling through undocumented data structures. We would argue
+ * that this is a bug in the design of the dlopen interface. THIS CODE
+ * MAY BREAK IN FUTURE OS RELEASES. If this matters to you, don't hesitate
+ * to let your vendor know ...
+ *
+ * None of this is safe with dlclose and incremental collection.
+ * But then not much of anything is safe in the presence of dlclose.
+ */
+ #if defined(__linux__) && !defined(_GNU_SOURCE)
+ /* Can't test LINUX, since this must be define before other includes */
+ # define _GNU_SOURCE
+ #endif
+ #if !defined(MACOS) && !defined(_WIN32_WCE)
+ # include <sys/types.h>
+ #endif
+ #include "private/gc_priv.h"
+
+ /* BTL: avoid circular redefinition of dlopen if GC_SOLARIS_THREADS defined */
+ # if (defined(GC_PTHREADS) || defined(GC_SOLARIS_THREADS)) \
+ && defined(dlopen) && !defined(GC_USE_LD_WRAP)
+ /* To support threads in Solaris, gc.h interposes on dlopen by */
+ /* defining "dlopen" to be "GC_dlopen", which is implemented below. */
+ /* However, both GC_FirstDLOpenedLinkMap() and GC_dlopen() use the */
+ /* real system dlopen() in their implementation. We first remove */
+ /* gc.h's dlopen definition and restore it later, after GC_dlopen(). */
+ # undef dlopen
+ # define GC_must_restore_redefined_dlopen
+ # else
+ # undef GC_must_restore_redefined_dlopen
+ # endif
+
+ #if (defined(DYNAMIC_LOADING) || defined(MSWIN32) || defined(MSWINCE)) \
+ && !defined(PCR)
+ #if !defined(SUNOS4) && !defined(SUNOS5DL) && !defined(IRIX5) && \
+ !defined(MSWIN32) && !defined(MSWINCE) && \
+ !(defined(ALPHA) && defined(OSF1)) && \
+ !defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \
+ !defined(RS6000) && !defined(SCO_ELF) && !defined(DGUX) && \
+ !(defined(FREEBSD) && defined(__ELF__)) && \
+ !(defined(NETBSD) && defined(__ELF__)) && !defined(HURD) && \
+ !defined(DARWIN)
+ --> We only know how to find data segments of dynamic libraries for the
+ --> above. Additional SVR4 variants might not be too
+ --> hard to add.
+ #endif
+
+ #include <stdio.h>
+ #ifdef SUNOS5DL
+ # include <sys/elf.h>
+ # include <dlfcn.h>
+ # include <link.h>
+ #endif
+ #ifdef SUNOS4
+ # include <dlfcn.h>
+ # include <link.h>
+ # include <a.out.h>
+ /* struct link_map field overrides */
+ # define l_next lm_next
+ # define l_addr lm_addr
+ # define l_name lm_name
+ #endif
+
+ #if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \
+ (defined(FREEBSD) && defined(__ELF__)) || defined(DGUX) || \
+ (defined(NETBSD) && defined(__ELF__)) || defined(HURD)
+ # include <stddef.h>
+ # include <elf.h>
+ # include <link.h>
+ #endif
+
+ /* Newer versions of GNU/Linux define this macro. We
+ * define it similarly for any ELF systems that don't. */
+ # ifndef ElfW
+ # if !defined(ELF_CLASS) || ELF_CLASS == ELFCLASS32
+ # define ElfW(type) Elf32_##type
+ # else
+ # define ElfW(type) Elf64_##type
+ # endif
+ # endif
+
+ #if defined(SUNOS5DL) && !defined(USE_PROC_FOR_LIBRARIES)
+
+ #ifdef LINT
+ Elf32_Dyn _DYNAMIC;
+ #endif
+
+ static struct link_map *
+ GC_FirstDLOpenedLinkMap()
+ {
+ extern ElfW(Dyn) _DYNAMIC;
+ ElfW(Dyn) *dp;
+ struct r_debug *r;
+ static struct link_map * cachedResult = 0;
+ static ElfW(Dyn) *dynStructureAddr = 0;
+ /* BTL: added to avoid Solaris 5.3 ld.so _DYNAMIC bug */
+
+ # ifdef SUNOS53_SHARED_LIB
+ /* BTL: Avoid the Solaris 5.3 bug that _DYNAMIC isn't being set */
+ /* up properly in dynamically linked .so's. This means we have */
+ /* to use its value in the set of original object files loaded */
+ /* at program startup. */
+ if( dynStructureAddr == 0 ) {
+ void* startupSyms = dlopen(0, RTLD_LAZY);
+ dynStructureAddr = (ElfW(Dyn)*)dlsym(startupSyms, "_DYNAMIC");
+ }
+ # else
+ dynStructureAddr = &_DYNAMIC;
+ # endif
+
+ if( dynStructureAddr == 0) {
+ return(0);
+ }
+ if( cachedResult == 0 ) {
+ int tag;
+ for( dp = ((ElfW(Dyn) *)(&_DYNAMIC)); (tag = dp->d_tag) != 0; dp++ ) {
+ if( tag == DT_DEBUG ) {
+ struct link_map *lm
+ = ((struct r_debug *)(dp->d_un.d_ptr))->r_map;
+ if( lm != 0 ) cachedResult = lm->l_next; /* might be NIL */
+ break;
+ }
+ }
+ }
+ return cachedResult;
+ }
+
+ #endif /* SUNOS5DL ... */
+
+ /* BTL: added to fix circular dlopen definition if GC_SOLARIS_THREADS defined
*/
+ # if defined(GC_must_restore_redefined_dlopen)
+ # define dlopen GC_dlopen
+ # endif
+
+ #if defined(SUNOS4) && !defined(USE_PROC_FOR_LIBRARIES)
+
+ #ifdef LINT
+ struct link_dynamic _DYNAMIC;
+ #endif
+
+ static struct link_map *
+ GC_FirstDLOpenedLinkMap()
+ {
+ extern struct link_dynamic _DYNAMIC;
+
+ if( &_DYNAMIC == 0) {
+ return(0);
+ }
+ return(_DYNAMIC.ld_un.ld_1->ld_loaded);
+ }
+
+ /* Return the address of the ld.so allocated common symbol */
+ /* with the least address, or 0 if none. */
+ static ptr_t GC_first_common()
+ {
+ ptr_t result = 0;
+ extern struct link_dynamic _DYNAMIC;
+ struct rtc_symb * curr_symbol;
+
+ if( &_DYNAMIC == 0) {
+ return(0);
+ }
+ curr_symbol = _DYNAMIC.ldd -> ldd_cp;
+ for (; curr_symbol != 0; curr_symbol = curr_symbol -> rtc_next) {
+ if (result == 0
+ || (ptr_t)(curr_symbol -> rtc_sp -> n_value) < result) {
+ result = (ptr_t)(curr_symbol -> rtc_sp -> n_value);
+ }
+ }
+ return(result);
+ }
+
+ #endif /* SUNOS4 ... */
+
+ # if defined(SUNOS4) || defined(SUNOS5DL)
+ /* Add dynamic library data sections to the root set. */
+ # if !defined(PCR) && !defined(GC_SOLARIS_THREADS) && defined(THREADS)
+ # ifndef SRC_M3
+ --> fix mutual exclusion with dlopen
+ # endif /* We assume M3 programs don't call dlopen for now */
+ # endif
+
+ # ifndef USE_PROC_FOR_LIBRARIES
+ void GC_register_dynamic_libraries()
+ {
+ struct link_map *lm = GC_FirstDLOpenedLinkMap();
+
+
+ for (lm = GC_FirstDLOpenedLinkMap();
+ lm != (struct link_map *) 0; lm = lm->l_next)
+ {
+ # ifdef SUNOS4
+ struct exec *e;
+
+ e = (struct exec *) lm->lm_addr;
+ GC_add_roots_inner(
+ ((char *) (N_DATOFF(*e) + lm->lm_addr)),
+ ((char *) (N_BSSADDR(*e) + e->a_bss + lm->lm_addr)),
+ TRUE);
+ # endif
+ # ifdef SUNOS5DL
+ ElfW(Ehdr) * e;
+ ElfW(Phdr) * p;
+ unsigned long offset;
+ char * start;
+ register int i;
+
+ e = (ElfW(Ehdr) *) lm->l_addr;
+ p = ((ElfW(Phdr) *)(((char *)(e)) + e->e_phoff));
+ offset = ((unsigned long)(lm->l_addr));
+ for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) {
+ switch( p->p_type ) {
+ case PT_LOAD:
+ {
+ if( !(p->p_flags & PF_W) ) break;
+ start = ((char *)(p->p_vaddr)) + offset;
+ GC_add_roots_inner(
+ start,
+ start + p->p_memsz,
+ TRUE
+ );
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ # endif
+ }
+ # ifdef SUNOS4
+ {
+ static ptr_t common_start = 0;
+ ptr_t common_end;
+ extern ptr_t GC_find_limit();
+
+ if (common_start == 0) common_start = GC_first_common();
+ if (common_start != 0) {
+ common_end = GC_find_limit(common_start, TRUE);
+ GC_add_roots_inner((char *)common_start, (char
*)common_end, TRUE);
+ }
+ }
+ # endif
+ }
+
+ # endif /* !USE_PROC ... */
+ # endif /* SUNOS */
+
+ #if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \
+ (defined(FREEBSD) && defined(__ELF__)) || defined(DGUX) || \
+ (defined(NETBSD) && defined(__ELF__)) || defined(HURD)
+
+
+ #ifdef USE_PROC_FOR_LIBRARIES
+
+ #include <string.h>
+
+ #include <sys/stat.h>
+ #include <fcntl.h>
+ #include <unistd.h>
+
+ #define MAPS_BUF_SIZE (32*1024)
+
+ extern ssize_t GC_repeat_read(int fd, char *buf, size_t count);
+ /* Repeatedly read until buffer is filled, or EOF is encountered */
+ /* Defined in os_dep.c. */
+
+ char *GC_parse_map_entry(char *buf_ptr, word *start, word *end,
+ char *prot_buf, unsigned int *maj_dev);
+ word GC_apply_to_maps(word (*fn)(char *));
+ /* From os_dep.c */
+
+ word GC_register_map_entries(char *maps)
+ {
+ char prot_buf[5];
+ char *buf_ptr = maps;
+ int count;
+ word start, end;
+ unsigned int maj_dev;
+ word least_ha, greatest_ha;
+ unsigned i;
+ word datastart = (word)(DATASTART);
+
+ /* Compute heap bounds. FIXME: Should be done by add_to_heap? */
+ least_ha = (word)(-1);
+ greatest_ha = 0;
+ for (i = 0; i < GC_n_heap_sects; ++i) {
+ word sect_start = (word)GC_heap_sects[i].hs_start;
+ word sect_end = sect_start + GC_heap_sects[i].hs_bytes;
+ if (sect_start < least_ha) least_ha = sect_start;
+ if (sect_end > greatest_ha) greatest_ha = sect_end;
+ }
+ if (greatest_ha < (word)GC_scratch_last_end_ptr)
+ greatest_ha = (word)GC_scratch_last_end_ptr;
+
+ for (;;) {
+ buf_ptr = GC_parse_map_entry(buf_ptr, &start, &end, prot_buf,
&maj_dev);
+ if (buf_ptr == NULL) return 1;
+ if (prot_buf[1] == 'w') {
+ /* This is a writable mapping. Add it to */
+ /* the root set unless it is already otherwise */
+ /* accounted for. */
+ if (start <= (word)GC_stackbottom && end >= (word)GC_stackbottom) {
+ /* Stack mapping; discard */
+ continue;
+ }
+ # ifdef THREADS
+ if (GC_segment_is_thread_stack(start, end)) continue;
+ # endif
+ /* We no longer exclude the main data segment. */
+ if (start < least_ha && end > least_ha) {
+ end = least_ha;
+ }
+ if (start < greatest_ha && end > greatest_ha) {
+ start = greatest_ha;
+ }
+ if (start >= least_ha && end <= greatest_ha) continue;
+ GC_add_roots_inner((char *)start, (char *)end, TRUE);
+ }
+ }
+ return 1;
+ }
+
+ void GC_register_dynamic_libraries()
+ {
+ if (!GC_apply_to_maps(GC_register_map_entries))
+ ABORT("Failed to read /proc for library registration.");
+ }
+
+ /* We now take care of the main data segment ourselves: */
+ GC_bool GC_register_main_static_data()
+ {
+ return FALSE;
+ }
+
+ # define HAVE_REGISTER_MAIN_STATIC_DATA
+
+ #endif /* USE_PROC_FOR_LIBRARIES */
+
+ #if !defined(USE_PROC_FOR_LIBRARIES)
+ /* The following is the preferred way to walk dynamic libraries */
+ /* For glibc 2.2.4+. Unfortunately, it doesn't work for older */
+ /* versions. Thanks to Jakub Jelinek for most of the code. */
+
+ # if defined(LINUX) /* Are others OK here, too? */ \
+ && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
+ || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
+
+ /* We have the header files for a glibc that includes dl_iterate_phdr.
*/
+ /* It may still not be available in the library on the target system. */
+ /* Thus we also treat it as a weak symbol. */
+ #define HAVE_DL_ITERATE_PHDR
+
+ static int GC_register_dynlib_callback(info, size, ptr)
+ struct dl_phdr_info * info;
+ size_t size;
+ void * ptr;
+ {
+ const ElfW(Phdr) * p;
+ char * start;
+ register int i;
+
+ /* Make sure struct dl_phdr_info is at least as big as we need. */
+ if (size < offsetof (struct dl_phdr_info, dlpi_phnum)
+ + sizeof (info->dlpi_phnum))
+ return -1;
+
+ p = info->dlpi_phdr;
+ for( i = 0; i < (int)(info->dlpi_phnum); ((i++),(p++)) ) {
+ switch( p->p_type ) {
+ case PT_LOAD:
+ {
+ if( !(p->p_flags & PF_W) ) break;
+ start = ((char *)(p->p_vaddr)) + info->dlpi_addr;
+ GC_add_roots_inner(start, start + p->p_memsz, TRUE);
+ }
+ break;
+ default:
+ break;
+ }
+ }
+
+ * (int *)ptr = 1; /* Signal that we were called */
+ return 0;
+ }
+
+ /* Return TRUE if we succeed, FALSE if dl_iterate_phdr wasn't there. */
+
+ #pragma weak dl_iterate_phdr
+
+ GC_bool GC_register_dynamic_libraries_dl_iterate_phdr()
+ {
+ if (dl_iterate_phdr) {
+ int did_something = 0;
+ dl_iterate_phdr(GC_register_dynlib_callback, &did_something);
+ if (!did_something) {
+ /* dl_iterate_phdr may forget the static data segment in */
+ /* statically linked executables. */
+ GC_add_roots_inner(DATASTART, (char *)(DATAEND), TRUE);
+ # if defined(DATASTART2)
+ GC_add_roots_inner(DATASTART2, (char *)(DATAEND2), TRUE);
+ # endif
+ }
+
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+ }
+
+ /* Do we need to separately register the main static data segment? */
+ GC_bool GC_register_main_static_data()
+ {
+ return (dl_iterate_phdr == 0);
+ }
+
+ #define HAVE_REGISTER_MAIN_STATIC_DATA
+
+ # else /* !LINUX || version(glibc) < 2.2.4 */
+
+ /* Dynamic loading code for Linux running ELF. Somewhat tested on
+ * Linux/x86, untested but hopefully should work on Linux/Alpha.
+ * This code was derived from the Solaris/ELF support. Thanks to
+ * whatever kind soul wrote that. - Patrick Bridges */
+
+ /* This doesn't necessarily work in all cases, e.g. with preloaded
+ * dynamic libraries. */
+
+ #if defined(NETBSD)
+ # include <sys/exec_elf.h>
+ #else
+ # include <elf.h>
+ #endif
+ #include <link.h>
+
+ # endif
+
+ #ifdef __GNUC__
+ # pragma weak _DYNAMIC
+ #endif
+ extern ElfW(Dyn) _DYNAMIC[];
+
+ static struct link_map *
+ GC_FirstDLOpenedLinkMap()
+ {
+ ElfW(Dyn) *dp;
+ struct r_debug *r;
+ static struct link_map *cachedResult = 0;
+
+ if( _DYNAMIC == 0) {
+ return(0);
+ }
+ if( cachedResult == 0 ) {
+ int tag;
+ for( dp = _DYNAMIC; (tag = dp->d_tag) != 0; dp++ ) {
+ if( tag == DT_DEBUG ) {
+ struct link_map *lm
+ = ((struct r_debug *)(dp->d_un.d_ptr))->r_map;
+ if( lm != 0 ) cachedResult = lm->l_next; /* might be NIL */
+ break;
+ }
+ }
+ }
+ return cachedResult;
+ }
+
+
+ void GC_register_dynamic_libraries()
+ {
+ struct link_map *lm;
+
+
+ # ifdef HAVE_DL_ITERATE_PHDR
+ if (GC_register_dynamic_libraries_dl_iterate_phdr()) {
+ return;
+ }
+ # endif
+ lm = GC_FirstDLOpenedLinkMap();
+ for (lm = GC_FirstDLOpenedLinkMap();
+ lm != (struct link_map *) 0; lm = lm->l_next)
+ {
+ ElfW(Ehdr) * e;
+ ElfW(Phdr) * p;
+ unsigned long offset;
+ char * start;
+ register int i;
+
+ e = (ElfW(Ehdr) *) lm->l_addr;
+ p = ((ElfW(Phdr) *)(((char *)(e)) + e->e_phoff));
+ offset = ((unsigned long)(lm->l_addr));
+ for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) {
+ switch( p->p_type ) {
+ case PT_LOAD:
+ {
+ if( !(p->p_flags & PF_W) ) break;
+ start = ((char *)(p->p_vaddr)) + offset;
+ GC_add_roots_inner(start, start + p->p_memsz, TRUE);
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ }
+ }
+
+ #endif /* !USE_PROC_FOR_LIBRARIES */
+
+ #endif /* LINUX */
+
+ #if defined(IRIX5) || (defined(USE_PROC_FOR_LIBRARIES) && !defined(LINUX))
+
+ #include <sys/procfs.h>
+ #include <sys/stat.h>
+ #include <fcntl.h>
+ #include <elf.h>
+ #include <errno.h>
+ #include <signal.h> /* Only for the following test. */
+ #ifndef _sigargs
+ # define IRIX6
+ #endif
+
+ extern void * GC_roots_present();
+ /* The type is a lie, since the real type doesn't make sense here, */
+ /* and we only test for NULL. */
+
+
+ /* We use /proc to track down all parts of the address space that are */
+ /* mapped by the process, and throw out regions we know we shouldn't */
+ /* worry about. This may also work under other SVR4 variants.
*/
+ void GC_register_dynamic_libraries()
+ {
+ static int fd = -1;
+ char buf[30];
+ static prmap_t * addr_map = 0;
+ static int current_sz = 0; /* Number of records currently in
addr_map */
+ static int needed_sz; /* Required size of addr_map */
+ register int i;
+ register long flags;
+ register ptr_t start;
+ register ptr_t limit;
+ ptr_t heap_start = (ptr_t)HEAP_START;
+ ptr_t heap_end = heap_start;
+
+ # ifdef SUNOS5DL
+ # define MA_PHYS 0
+ # endif /* SUNOS5DL */
+
+ if (fd < 0) {
+ sprintf(buf, "/proc/%d", getpid());
+ /* The above generates a lint complaint, since pid_t varies. */
+ /* It's unclear how to improve this. */
+ fd = open(buf, O_RDONLY);
+ if (fd < 0) {
+ ABORT("/proc open failed");
+ }
+ }
+ if (ioctl(fd, PIOCNMAP, &needed_sz) < 0) {
+ GC_err_printf2("fd = %d, errno = %d\n", fd, errno);
+ ABORT("/proc PIOCNMAP ioctl failed");
+ }
+ if (needed_sz >= current_sz) {
+ current_sz = needed_sz * 2 + 1;
+ /* Expansion, plus room for 0 record */
+ addr_map = (prmap_t *)GC_scratch_alloc((word)
+ (current_sz * sizeof(prmap_t)));
+ }
+ if (ioctl(fd, PIOCMAP, addr_map) < 0) {
+ GC_err_printf4("fd = %d, errno = %d, needed_sz = %d, addr_map =
0x%X\n",
+ fd, errno, needed_sz, addr_map);
+ ABORT("/proc PIOCMAP ioctl failed");
+ };
+ if (GC_n_heap_sects > 0) {
+ heap_end = GC_heap_sects[GC_n_heap_sects-1].hs_start
+ + GC_heap_sects[GC_n_heap_sects-1].hs_bytes;
+ if (heap_end < GC_scratch_last_end_ptr) heap_end =
GC_scratch_last_end_ptr;
+ }
+ for (i = 0; i < needed_sz; i++) {
+ flags = addr_map[i].pr_mflags;
+ if ((flags & (MA_BREAK | MA_STACK | MA_PHYS)) != 0) goto irrelevant;
+ if ((flags & (MA_READ | MA_WRITE)) != (MA_READ | MA_WRITE))
+ goto irrelevant;
+ /* The latter test is empirically useless in very old Irix */
+ /* versions. Other than the */
+ /* main data and stack segments, everything appears to be */
+ /* mapped readable, writable, executable, and shared(!!). */
+ /* This makes no sense to me. - HB
*/
+ start = (ptr_t)(addr_map[i].pr_vaddr);
+ if (GC_roots_present(start)) goto irrelevant;
+ if (start < heap_end && start >= heap_start)
+ goto irrelevant;
+ # ifdef MMAP_STACKS
+ if (GC_is_thread_stack(start)) goto irrelevant;
+ # endif /* MMAP_STACKS */
+
+ limit = start + addr_map[i].pr_size;
+ /* The following seemed to be necessary for very old versions */
+ /* of Irix, but it has been reported to discard relevant */
+ /* segments under Irix 6.5. */
+ # ifndef IRIX6
+ if (addr_map[i].pr_off == 0 && strncmp(start, ELFMAG, 4) == 0) {
+ /* Discard text segments, i.e. 0-offset mappings against */
+ /* executable files which appear to have ELF headers. */
+ caddr_t arg;
+ int obj;
+ # define MAP_IRR_SZ 10
+ static ptr_t map_irr[MAP_IRR_SZ];
+ /* Known irrelevant map entries */
+ static int n_irr = 0;
+ struct stat buf;
+ register int i;
+
+ for (i = 0; i < n_irr; i++) {
+ if (map_irr[i] == start) goto irrelevant;
+ }
+ arg = (caddr_t)start;
+ obj = ioctl(fd, PIOCOPENM, &arg);
+ if (obj >= 0) {
+ fstat(obj, &buf);
+ close(obj);
+ if ((buf.st_mode & 0111) != 0) {
+ if (n_irr < MAP_IRR_SZ) {
+ map_irr[n_irr++] = start;
+ }
+ goto irrelevant;
+ }
+ }
+ }
+ # endif /* !IRIX6 */
+ GC_add_roots_inner(start, limit, TRUE);
+ irrelevant: ;
+ }
+ /* Dont keep cached descriptor, for now. Some kernels don't like us */
+ /* to keep a /proc file descriptor around during kill -9. */
+ if (close(fd) < 0) ABORT("Couldnt close /proc file");
+ fd = -1;
+ }
+
+ # endif /* USE_PROC || IRIX5 */
+
+ # if defined(MSWIN32) || defined(MSWINCE)
+
+ # define WIN32_LEAN_AND_MEAN
+ # define NOSERVICE
+ # include <windows.h>
+ # include <stdlib.h>
+
+ /* We traverse the entire address space and register all segments */
+ /* that could possibly have been written to.
*/
+
+ extern GC_bool GC_is_heap_base (ptr_t p);
+
+ # ifdef GC_WIN32_THREADS
+ extern void GC_get_next_stack(char *start, char **lo, char **hi);
+ void GC_cond_add_roots(char *base, char * limit)
+ {
+ char * curr_base = base;
+ char * next_stack_lo;
+ char * next_stack_hi;
+
+ if (base == limit) return;
+ for(;;) {
+ GC_get_next_stack(curr_base, &next_stack_lo, &next_stack_hi);
+ if (next_stack_lo >= limit) break;
+ GC_add_roots_inner(curr_base, next_stack_lo, TRUE);
+ curr_base = next_stack_hi;
+ }
+ if (curr_base < limit) GC_add_roots_inner(curr_base, limit, TRUE);
+ }
+ # else
+ void GC_cond_add_roots(char *base, char * limit)
+ {
+ char dummy;
+ char * stack_top
+ = (char *) ((word)(&dummy) & ~(GC_sysinfo.dwAllocationGranularity-1));
+ if (base == limit) return;
+ if (limit > stack_top && base < GC_stackbottom) {
+ /* Part of the stack; ignore it. */
+ return;
+ }
+ GC_add_roots_inner(base, limit, TRUE);
+ }
+ # endif
+
+ # ifdef MSWINCE
+ /* Do we need to separately register the main static data segment? */
+ GC_bool GC_register_main_static_data()
+ {
+ return FALSE;
+ }
+ # else /* win32 */
+ extern GC_bool GC_no_win32_dlls;
+
+ GC_bool GC_register_main_static_data()
+ {
+ return GC_no_win32_dlls;
+ }
+ # endif /* win32 */
+
+ # define HAVE_REGISTER_MAIN_STATIC_DATA
+
+ void GC_register_dynamic_libraries()
+ {
+ MEMORY_BASIC_INFORMATION buf;
+ DWORD result;
+ DWORD protect;
+ LPVOID p;
+ char * base;
+ char * limit, * new_limit;
+
+ # ifdef MSWIN32
+ if (GC_no_win32_dlls) return;
+ # endif
+ base = limit = p = GC_sysinfo.lpMinimumApplicationAddress;
+ # if defined(MSWINCE) && !defined(_WIN32_WCE_EMULATION)
+ /* Only the first 32 MB of address space belongs to the current process */
+ while (p < (LPVOID)0x02000000) {
+ result = VirtualQuery(p, &buf, sizeof(buf));
+ if (result == 0) {
+ /* Page is free; advance to the next possible allocation base */
+ new_limit = (char *)
+ (((DWORD) p + GC_sysinfo.dwAllocationGranularity)
+ & ~(GC_sysinfo.dwAllocationGranularity-1));
+ } else
+ # else
+ while (p < GC_sysinfo.lpMaximumApplicationAddress) {
+ result = VirtualQuery(p, &buf, sizeof(buf));
+ # endif
+ {
+ if (result != sizeof(buf)) {
+ ABORT("Weird VirtualQuery result");
+ }
+ new_limit = (char *)p + buf.RegionSize;
+ protect = buf.Protect;
+ if (buf.State == MEM_COMMIT
+ && (protect == PAGE_EXECUTE_READWRITE
+ || protect == PAGE_READWRITE)
+ && !GC_is_heap_base(buf.AllocationBase)) {
+ if ((char *)p != limit) {
+ GC_cond_add_roots(base, limit);
+ base = p;
+ }
+ limit = new_limit;
+ }
+ }
+ if (p > (LPVOID)new_limit /* overflow */) break;
+ p = (LPVOID)new_limit;
+ }
+ GC_cond_add_roots(base, limit);
+ }
+
+ #endif /* MSWIN32 || MSWINCE */
+
+ #if defined(ALPHA) && defined(OSF1)
+
+ #include <loader.h>
+
+ void GC_register_dynamic_libraries()
+ {
+ int status;
+ ldr_process_t mypid;
+
+ /* module */
+ ldr_module_t moduleid = LDR_NULL_MODULE;
+ ldr_module_info_t moduleinfo;
+ size_t moduleinfosize = sizeof(moduleinfo);
+ size_t modulereturnsize;
+
+ /* region */
+ ldr_region_t region;
+ ldr_region_info_t regioninfo;
+ size_t regioninfosize = sizeof(regioninfo);
+ size_t regionreturnsize;
+
+ /* Obtain id of this process */
+ mypid = ldr_my_process();
+
+ /* For each module */
+ while (TRUE) {
+
+ /* Get the next (first) module */
+ status = ldr_next_module(mypid, &moduleid);
+
+ /* Any more modules? */
+ if (moduleid == LDR_NULL_MODULE)
+ break; /* No more modules */
+
+ /* Check status AFTER checking moduleid because */
+ /* of a bug in the non-shared ldr_next_module stub */
+ if (status != 0 ) {
+ GC_printf1("dynamic_load: status = %ld\n", (long)status);
+ {
+ extern char *sys_errlist[];
+ extern int sys_nerr;
+ extern int errno;
+ if (errno <= sys_nerr) {
+ GC_printf1("dynamic_load: %s\n",
(long)sys_errlist[errno]);
+ } else {
+ GC_printf1("dynamic_load: %d\n", (long)errno);
+ }
+ }
+ ABORT("ldr_next_module failed");
+ }
+
+ /* Get the module information */
+ status = ldr_inq_module(mypid, moduleid, &moduleinfo,
+ moduleinfosize, &modulereturnsize);
+ if (status != 0 )
+ ABORT("ldr_inq_module failed");
+
+ /* is module for the main program (i.e. nonshared portion)? */
+ if (moduleinfo.lmi_flags & LDR_MAIN)
+ continue; /* skip the main module */
+
+ # ifdef VERBOSE
+ GC_printf("---Module---\n");
+ GC_printf("Module ID = %16ld\n", moduleinfo.lmi_modid);
+ GC_printf("Count of regions = %16d\n", moduleinfo.lmi_nregion);
+ GC_printf("flags for module = %16lx\n", moduleinfo.lmi_flags);
+ GC_printf("pathname of module = \"%s\"\n", moduleinfo.lmi_name);
+ # endif
+
+ /* For each region in this module */
+ for (region = 0; region < moduleinfo.lmi_nregion; region++) {
+
+ /* Get the region information */
+ status = ldr_inq_region(mypid, moduleid, region, ®ioninfo,
+ regioninfosize, ®ionreturnsize);
+ if (status != 0 )
+ ABORT("ldr_inq_region failed");
+
+ /* only process writable (data) regions */
+ if (! (regioninfo.lri_prot & LDR_W))
+ continue;
+
+ # ifdef VERBOSE
+ GC_printf("--- Region ---\n");
+ GC_printf("Region number = %16ld\n",
+ regioninfo.lri_region_no);
+ GC_printf("Protection flags = %016x\n", regioninfo.lri_prot);
+ GC_printf("Virtual address = %16p\n", regioninfo.lri_vaddr);
+ GC_printf("Mapped address = %16p\n",
regioninfo.lri_mapaddr);
+ GC_printf("Region size = %16ld\n", regioninfo.lri_size);
+ GC_printf("Region name = \"%s\"\n", regioninfo.lri_name);
+ # endif
+
+ /* register region as a garbage collection root */
+ GC_add_roots_inner (
+ (char *)regioninfo.lri_mapaddr,
+ (char *)regioninfo.lri_mapaddr + regioninfo.lri_size,
+ TRUE);
+
+ }
+ }
+ }
+ #endif
+
+ #if defined(HPUX)
+
+ #include <errno.h>
+ #include <dl.h>
+
+ extern int errno;
+ extern char *sys_errlist[];
+ extern int sys_nerr;
+
+ void GC_register_dynamic_libraries()
+ {
+ int status;
+ int index = 1; /* Ordinal position in shared library search list */
+ struct shl_descriptor *shl_desc; /* Shared library info, see dl.h */
+
+ /* For each dynamic library loaded */
+ while (TRUE) {
+
+ /* Get info about next shared library */
+ status = shl_get(index, &shl_desc);
+
+ /* Check if this is the end of the list or if some error occured */
+ if (status != 0) {
+ # ifdef GC_HPUX_THREADS
+ /* I've seen errno values of 0. The man page is not clear */
+ /* as to whether errno should get set on a -1 return. */
+ break;
+ # else
+ if (errno == EINVAL) {
+ break; /* Moved past end of shared library list --> finished */
+ } else {
+ if (errno <= sys_nerr) {
+ GC_printf1("dynamic_load: %s\n", (long)
sys_errlist[errno]);
+ } else {
+ GC_printf1("dynamic_load: %d\n", (long) errno);
+ }
+ ABORT("shl_get failed");
+ }
+ # endif
+ }
+
+ # ifdef VERBOSE
+ GC_printf0("---Shared library---\n");
+ GC_printf1("\tfilename = \"%s\"\n", shl_desc->filename);
+ GC_printf1("\tindex = %d\n", index);
+ GC_printf1("\thandle = %08x\n",
+ (unsigned long) shl_desc->handle);
+ GC_printf1("\ttext seg. start = %08x\n", shl_desc->tstart);
+ GC_printf1("\ttext seg. end = %08x\n", shl_desc->tend);
+ GC_printf1("\tdata seg. start = %08x\n", shl_desc->dstart);
+ GC_printf1("\tdata seg. end = %08x\n", shl_desc->dend);
+ GC_printf1("\tref. count = %lu\n", shl_desc->ref_count);
+ # endif
+
+ /* register shared library's data segment as a garbage collection root
*/
+ GC_add_roots_inner((char *) shl_desc->dstart,
+ (char *) shl_desc->dend, TRUE);
+
+ index++;
+ }
+ }
+ #endif /* HPUX */
+
+ #ifdef RS6000
+ #pragma alloca
+ #include <sys/ldr.h>
+ #include <sys/errno.h>
+ void GC_register_dynamic_libraries()
+ {
+ int len;
+ char *ldibuf;
+ int ldibuflen;
+ struct ld_info *ldi;
+
+ ldibuf = alloca(ldibuflen = 8192);
+
+ while ( (len = loadquery(L_GETINFO,ldibuf,ldibuflen)) < 0) {
+ if (errno != ENOMEM) {
+ ABORT("loadquery failed");
+ }
+ ldibuf = alloca(ldibuflen *= 2);
+ }
+
+ ldi = (struct ld_info *)ldibuf;
+ while (ldi) {
+ len = ldi->ldinfo_next;
+ GC_add_roots_inner(
+ ldi->ldinfo_dataorg,
+ (ptr_t)(unsigned long)ldi->ldinfo_dataorg
+ + ldi->ldinfo_datasize,
+ TRUE);
+ ldi = len ? (struct ld_info *)((char *)ldi + len) : 0;
+ }
+ }
+ #endif /* RS6000 */
+
+ #ifdef DARWIN
+
+ #include <mach-o/dyld.h>
+ #include <mach-o/getsect.h>
+
+ /*#define DARWIN_DEBUG*/
+
+ const static struct {
+ const char *seg;
+ const char *sect;
+ } GC_dyld_sections[] = {
+ { SEG_DATA, SECT_DATA },
+ { SEG_DATA, SECT_BSS },
+ { SEG_DATA, SECT_COMMON }
+ };
+
+ #ifdef DARWIN_DEBUG
+ static const char *GC_dyld_name_for_hdr(struct mach_header *hdr) {
+ unsigned long i,c;
+ c = _dyld_image_count();
+ for(i=0;i<c;i++) if(_dyld_get_image_header(i) == hdr)
+ return _dyld_get_image_name(i);
+ return NULL;
+ }
+ #endif
+
+ /* This should never be called by a thread holding the lock */
+ static void GC_dyld_image_add(struct mach_header* hdr, unsigned long slide) {
+ unsigned long start,end,i;
+ const struct section *sec;
+ for(i=0;i<sizeof(GC_dyld_sections)/sizeof(GC_dyld_sections[0]);i++) {
+ sec = getsectbynamefromheader(
+ hdr,GC_dyld_sections[i].seg,GC_dyld_sections[i].sect);
+ if(sec == NULL || sec->size == 0) continue;
+ start = slide + sec->addr;
+ end = start + sec->size;
+ # ifdef DARWIN_DEBUG
+ GC_printf4("Adding section at %p-%p (%lu bytes) from image
%s\n",
+ start,end,sec->size,GC_dyld_name_for_hdr(hdr));
+ # endif
+ GC_add_roots((char*)start,(char*)end);
+ }
+ # ifdef DARWIN_DEBUG
+ GC_print_static_roots();
+ # endif
+ }
+
+ /* This should never be called by a thread holding the lock */
+ static void GC_dyld_image_remove(struct mach_header* hdr, unsigned long
slide) {
+ unsigned long start,end,i;
+ const struct section *sec;
+ for(i=0;i<sizeof(GC_dyld_sections)/sizeof(GC_dyld_sections[0]);i++) {
+ sec = getsectbynamefromheader(
+ hdr,GC_dyld_sections[i].seg,GC_dyld_sections[i].sect);
+ if(sec == NULL || sec->size == 0) continue;
+ start = slide + sec->addr;
+ end = start + sec->size;
+ # ifdef DARWIN_DEBUG
+ GC_printf4("Removing section at %p-%p (%lu bytes) from image
%s\n",
+ start,end,sec->size,GC_dyld_name_for_hdr(hdr));
+ # endif
+ GC_remove_roots((char*)start,(char*)end);
+ }
+ # ifdef DARWIN_DEBUG
+ GC_print_static_roots();
+ # endif
+ }
+
+ void GC_register_dynamic_libraries() {
+ /* Currently does nothing. The callbacks are setup by GC_init_dyld()
+ The dyld library takes it from there. */
+ }
+
+ /* The _dyld_* functions have an internal lock so no _dyld functions
+ can be called while the world is stopped without the risk of a deadlock.
+ Because of this we MUST setup callbacks BEFORE we ever stop the world.
+ This should be called BEFORE any thread in created and WITHOUT the
+ allocation lock held. */
+
+ void GC_init_dyld() {
+ static GC_bool initialized = FALSE;
+
+ if(initialized) return;
+
+ # ifdef DARWIN_DEBUG
+ GC_printf0("Forcing full bind of GC code...\n");
+ # endif
+ if(!_dyld_bind_fully_image_containing_address((unsigned long*)GC_malloc))
+ GC_abort("_dyld_bind_fully_image_containing_addres failed");
+
+ # ifdef DARWIN_DEBUG
+ GC_printf0("Registering dyld callbacks...\n");
+ # endif
+
+ /* Apple's Documentation:
+ When you call _dyld_register_func_for_add_image, the dynamic linker
runtime
+ calls the specified callback (func) once for each of the images that is
+ currently loaded into the program. When a new image is added to the
program,
+ your callback is called again with the mach_header for the new image, and
the virtual memory slide amount of the new image.
+
+ This WILL properly register existing and all future libraries
+ */
+
+ _dyld_register_func_for_add_image(GC_dyld_image_add);
+ _dyld_register_func_for_remove_image(GC_dyld_image_remove);
+ initialized = TRUE;
+ }
+
+ #define HAVE_REGISTER_MAIN_STATIC_DATA
+ GC_bool GC_register_main_static_data()
+ {
+ /* Already done through dyld callbacks */
+ return FALSE;
+ }
+
+ #endif /* DARWIN */
+
+ #else /* !DYNAMIC_LOADING */
+
+ #ifdef PCR
+
+ # include "il/PCR_IL.h"
+ # include "th/PCR_ThCtl.h"
+ # include "mm/PCR_MM.h"
+
+ void GC_register_dynamic_libraries()
+ {
+ /* Add new static data areas of dynamically loaded modules. */
+ {
+ PCR_IL_LoadedFile * p = PCR_IL_GetLastLoadedFile();
+ PCR_IL_LoadedSegment * q;
+
+ /* Skip uncommited files */
+ while (p != NIL && !(p -> lf_commitPoint)) {
+ /* The loading of this file has not yet been committed */
+ /* Hence its description could be inconsistent.
*/
+ /* Furthermore, it hasn't yet been run. Hence its data */
+ /* segments can't possibly reference heap allocated */
+ /* objects. */
+ p = p -> lf_prev;
+ }
+ for (; p != NIL; p = p -> lf_prev) {
+ for (q = p -> lf_ls; q != NIL; q = q -> ls_next) {
+ if ((q -> ls_flags & PCR_IL_SegFlags_Traced_MASK)
+ == PCR_IL_SegFlags_Traced_on) {
+ GC_add_roots_inner
+ ((char *)(q -> ls_addr),
+ (char *)(q -> ls_addr) + q -> ls_bytes,
+ TRUE);
+ }
+ }
+ }
+ }
+ }
+
+
+ #else /* !PCR */
+
+ void GC_register_dynamic_libraries(){}
+
+ int GC_no_dynamic_loading;
+
+ #endif /* !PCR */
+
+ #endif /* !DYNAMIC_LOADING */
+
+ #ifndef HAVE_REGISTER_MAIN_STATIC_DATA
+
+ /* Do we need to separately register the main static data segment? */
+ GC_bool GC_register_main_static_data()
+ {
+ return TRUE;
+ }
+ #endif /* HAVE_REGISTER_MAIN_STATIC_DATA */
+
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