version 1.6, 2002/07/24 08:00:08 |
version 1.7, 2003/06/24 05:11:32 |
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!defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \ |
!defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \ |
!defined(RS6000) && !defined(SCO_ELF) && !defined(DGUX) && \ |
!defined(RS6000) && !defined(SCO_ELF) && !defined(DGUX) && \ |
!(defined(FREEBSD) && defined(__ELF__)) && \ |
!(defined(FREEBSD) && defined(__ELF__)) && \ |
!(defined(NETBSD) && defined(__ELF__)) && !defined(HURD) |
!(defined(NETBSD) && defined(__ELF__)) && !defined(HURD) && \ |
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!defined(DARWIN) |
--> We only know how to find data segments of dynamic libraries for the |
--> We only know how to find data segments of dynamic libraries for the |
--> above. Additional SVR4 variants might not be too |
--> above. Additional SVR4 variants might not be too |
--> hard to add. |
--> hard to add. |
Line 282 extern ssize_t GC_repeat_read(int fd, char *buf, size_ |
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Line 283 extern ssize_t GC_repeat_read(int fd, char *buf, size_ |
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/* Repeatedly read until buffer is filled, or EOF is encountered */ |
/* Repeatedly read until buffer is filled, or EOF is encountered */ |
/* Defined in os_dep.c. */ |
/* Defined in os_dep.c. */ |
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static char *parse_map_entry(char *buf_ptr, word *start, word *end, |
char *GC_parse_map_entry(char *buf_ptr, word *start, word *end, |
char *prot_buf, unsigned int *maj_dev); |
char *prot_buf, unsigned int *maj_dev); |
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word GC_apply_to_maps(word (*fn)(char *)); |
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/* From os_dep.c */ |
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void GC_register_dynamic_libraries() |
word GC_register_map_entries(char *maps) |
{ |
{ |
int f; |
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int result; |
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char prot_buf[5]; |
char prot_buf[5]; |
int maps_size; |
char *buf_ptr = maps; |
char maps_temp[32768]; |
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char *maps_buf; |
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char *buf_ptr; |
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int count; |
int count; |
word start, end; |
word start, end; |
unsigned int maj_dev, min_dev; |
unsigned int maj_dev; |
word least_ha, greatest_ha; |
word least_ha, greatest_ha; |
unsigned i; |
unsigned i; |
word datastart = (word)(DATASTART); |
word datastart = (word)(DATASTART); |
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/* Read /proc/self/maps */ |
/* Compute heap bounds. FIXME: Should be done by add_to_heap? */ |
/* Note that we may not allocate, and thus can't use stdio. */ |
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f = open("/proc/self/maps", O_RDONLY); |
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if (-1 == f) ABORT("Couldn't open /proc/self/maps"); |
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/* stat() doesn't work for /proc/self/maps, so we have to |
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read it to find out how large it is... */ |
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maps_size = 0; |
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do { |
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result = GC_repeat_read(f, maps_temp, sizeof(maps_temp)); |
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if (result <= 0) ABORT("Couldn't read /proc/self/maps"); |
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maps_size += result; |
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} while (result == sizeof(maps_temp)); |
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if (maps_size > sizeof(maps_temp)) { |
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/* If larger than our buffer, close and re-read it. */ |
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close(f); |
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f = open("/proc/self/maps", O_RDONLY); |
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if (-1 == f) ABORT("Couldn't open /proc/self/maps"); |
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maps_buf = alloca(maps_size); |
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if (NULL == maps_buf) ABORT("/proc/self/maps alloca failed"); |
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result = GC_repeat_read(f, maps_buf, maps_size); |
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if (result <= 0) ABORT("Couldn't read /proc/self/maps"); |
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} else { |
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/* Otherwise use the fixed size buffer */ |
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maps_buf = maps_temp; |
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} |
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close(f); |
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maps_buf[result] = '\0'; |
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buf_ptr = maps_buf; |
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/* Compute heap bounds. Should be done by add_to_heap? */ |
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least_ha = (word)(-1); |
least_ha = (word)(-1); |
greatest_ha = 0; |
greatest_ha = 0; |
for (i = 0; i < GC_n_heap_sects; ++i) { |
for (i = 0; i < GC_n_heap_sects; ++i) { |
Line 342 void GC_register_dynamic_libraries() |
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Line 310 void GC_register_dynamic_libraries() |
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} |
} |
if (greatest_ha < (word)GC_scratch_last_end_ptr) |
if (greatest_ha < (word)GC_scratch_last_end_ptr) |
greatest_ha = (word)GC_scratch_last_end_ptr; |
greatest_ha = (word)GC_scratch_last_end_ptr; |
for (;;) { |
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buf_ptr = parse_map_entry(buf_ptr, &start, &end, prot_buf, &maj_dev); |
for (;;) { |
if (buf_ptr == NULL) return; |
buf_ptr = GC_parse_map_entry(buf_ptr, &start, &end, prot_buf, &maj_dev); |
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if (buf_ptr == NULL) return 1; |
if (prot_buf[1] == 'w') { |
if (prot_buf[1] == 'w') { |
/* This is a writable mapping. Add it to */ |
/* This is a writable mapping. Add it to */ |
/* the root set unless it is already otherwise */ |
/* the root set unless it is already otherwise */ |
Line 355 void GC_register_dynamic_libraries() |
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Line 322 void GC_register_dynamic_libraries() |
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/* Stack mapping; discard */ |
/* Stack mapping; discard */ |
continue; |
continue; |
} |
} |
if (start <= datastart && end > datastart && maj_dev != 0) { |
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/* Main data segment; discard */ |
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continue; |
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} |
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# ifdef THREADS |
# ifdef THREADS |
if (GC_segment_is_thread_stack(start, end)) continue; |
if (GC_segment_is_thread_stack(start, end)) continue; |
# endif |
# endif |
/* The rest of this assumes that there is no mapping */ |
/* We no longer exclude the main data segment. */ |
/* spanning the beginning of the data segment, or extending */ |
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/* beyond the entire heap at both ends. */ |
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/* Empirically these assumptions hold. */ |
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if (start < (word)DATAEND && end > (word)DATAEND) { |
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/* Rld may use space at the end of the main data */ |
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/* segment. Thus we add that in. */ |
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start = (word)DATAEND; |
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} |
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if (start < least_ha && end > least_ha) { |
if (start < least_ha && end > least_ha) { |
end = least_ha; |
end = least_ha; |
} |
} |
Line 381 void GC_register_dynamic_libraries() |
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Line 335 void GC_register_dynamic_libraries() |
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if (start >= least_ha && end <= greatest_ha) continue; |
if (start >= least_ha && end <= greatest_ha) continue; |
GC_add_roots_inner((char *)start, (char *)end, TRUE); |
GC_add_roots_inner((char *)start, (char *)end, TRUE); |
} |
} |
} |
} |
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return 1; |
} |
} |
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// |
void GC_register_dynamic_libraries() |
// parse_map_entry parses an entry from /proc/self/maps so we can |
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// locate all writable data segments that belong to shared libraries. |
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// The format of one of these entries and the fields we care about |
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// is as follows: |
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// XXXXXXXX-XXXXXXXX r-xp 00000000 30:05 260537 name of mapping...\n |
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// ^^^^^^^^ ^^^^^^^^ ^^^^ ^^ |
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// start end prot maj_dev |
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// 0 9 18 32 |
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// |
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// The parser is called with a pointer to the entry and the return value |
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// is either NULL or is advanced to the next entry(the byte after the |
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// trailing '\n'.) |
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// |
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#define OFFSET_MAP_START 0 |
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#define OFFSET_MAP_END 9 |
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#define OFFSET_MAP_PROT 18 |
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#define OFFSET_MAP_MAJDEV 32 |
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static char *parse_map_entry(char *buf_ptr, word *start, word *end, |
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char *prot_buf, unsigned int *maj_dev) |
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{ |
{ |
int i; |
if (!GC_apply_to_maps(GC_register_map_entries)) |
unsigned int val; |
ABORT("Failed to read /proc for library registration."); |
char *tok; |
} |
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if (buf_ptr == NULL || *buf_ptr == '\0') { |
/* We now take care of the main data segment ourselves: */ |
return NULL; |
GC_bool GC_register_main_static_data() |
} |
{ |
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return FALSE; |
memcpy(prot_buf, buf_ptr+OFFSET_MAP_PROT, 4); // do the protections first |
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prot_buf[4] = '\0'; |
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if (prot_buf[1] == 'w') { // we can skip all of this if it's not writable |
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tok = buf_ptr; |
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buf_ptr[OFFSET_MAP_START+8] = '\0'; |
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*start = strtoul(tok, NULL, 16); |
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tok = buf_ptr+OFFSET_MAP_END; |
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buf_ptr[OFFSET_MAP_END+8] = '\0'; |
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*end = strtoul(tok, NULL, 16); |
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buf_ptr += OFFSET_MAP_MAJDEV; |
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tok = buf_ptr; |
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while (*buf_ptr != ':') buf_ptr++; |
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*buf_ptr++ = '\0'; |
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*maj_dev = strtoul(tok, NULL, 16); |
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} |
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while (*buf_ptr && *buf_ptr++ != '\n'); |
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return buf_ptr; |
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} |
} |
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# define HAVE_REGISTER_MAIN_STATIC_DATA |
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#endif /* USE_PROC_FOR_LIBRARIES */ |
#endif /* USE_PROC_FOR_LIBRARIES */ |
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Line 469 static int GC_register_dynlib_callback(info, size, ptr |
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Line 383 static int GC_register_dynlib_callback(info, size, ptr |
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+ sizeof (info->dlpi_phnum)) |
+ sizeof (info->dlpi_phnum)) |
return -1; |
return -1; |
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/* Skip the first object - it is the main program. */ |
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if (*(int *)ptr == 0) |
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{ |
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*(int *)ptr = 1; |
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return 0; |
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} |
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p = info->dlpi_phdr; |
p = info->dlpi_phdr; |
for( i = 0; i < (int)(info->dlpi_phnum); ((i++),(p++)) ) { |
for( i = 0; i < (int)(info->dlpi_phnum); ((i++),(p++)) ) { |
switch( p->p_type ) { |
switch( p->p_type ) { |
Line 491 static int GC_register_dynlib_callback(info, size, ptr |
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Line 398 static int GC_register_dynlib_callback(info, size, ptr |
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} |
} |
} |
} |
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* (int *)ptr = 1; /* Signal that we were called */ |
return 0; |
return 0; |
} |
} |
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Line 500 static int GC_register_dynlib_callback(info, size, ptr |
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Line 408 static int GC_register_dynlib_callback(info, size, ptr |
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GC_bool GC_register_dynamic_libraries_dl_iterate_phdr() |
GC_bool GC_register_dynamic_libraries_dl_iterate_phdr() |
{ |
{ |
int tmp = 0; |
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if (dl_iterate_phdr) { |
if (dl_iterate_phdr) { |
dl_iterate_phdr(GC_register_dynlib_callback, &tmp); |
int did_something = 0; |
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dl_iterate_phdr(GC_register_dynlib_callback, &did_something); |
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if (!did_something) { |
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/* dl_iterate_phdr may forget the static data segment in */ |
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/* statically linked executables. */ |
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GC_add_roots_inner(DATASTART, (char *)(DATAEND), TRUE); |
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# if defined(DATASTART2) |
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GC_add_roots_inner(DATASTART2, (char *)(DATAEND2), TRUE); |
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# endif |
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} |
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return TRUE; |
return TRUE; |
} else { |
} else { |
return FALSE; |
return FALSE; |
} |
} |
} |
} |
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/* Do we need to separately register the main static data segment? */ |
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GC_bool GC_register_main_static_data() |
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{ |
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return (dl_iterate_phdr == 0); |
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} |
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#define HAVE_REGISTER_MAIN_STATIC_DATA |
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# else /* !LINUX || version(glibc) < 2.2.4 */ |
# else /* !LINUX || version(glibc) < 2.2.4 */ |
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/* Dynamic loading code for Linux running ELF. Somewhat tested on |
/* Dynamic loading code for Linux running ELF. Somewhat tested on |
Line 776 void GC_register_dynamic_libraries() |
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Line 700 void GC_register_dynamic_libraries() |
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} |
} |
# endif |
# endif |
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# ifndef MSWINCE |
# ifdef MSWINCE |
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/* Do we need to separately register the main static data segment? */ |
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GC_bool GC_register_main_static_data() |
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{ |
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return FALSE; |
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} |
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# else /* win32 */ |
extern GC_bool GC_no_win32_dlls; |
extern GC_bool GC_no_win32_dlls; |
# endif |
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GC_bool GC_register_main_static_data() |
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{ |
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return GC_no_win32_dlls; |
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} |
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# endif /* win32 */ |
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# define HAVE_REGISTER_MAIN_STATIC_DATA |
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void GC_register_dynamic_libraries() |
void GC_register_dynamic_libraries() |
{ |
{ |
MEMORY_BASIC_INFORMATION buf; |
MEMORY_BASIC_INFORMATION buf; |
Line 1024 void GC_register_dynamic_libraries() |
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Line 961 void GC_register_dynamic_libraries() |
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len = ldi->ldinfo_next; |
len = ldi->ldinfo_next; |
GC_add_roots_inner( |
GC_add_roots_inner( |
ldi->ldinfo_dataorg, |
ldi->ldinfo_dataorg, |
(unsigned long)ldi->ldinfo_dataorg |
(ptr_t)(unsigned long)ldi->ldinfo_dataorg |
+ ldi->ldinfo_datasize, |
+ ldi->ldinfo_datasize, |
TRUE); |
TRUE); |
ldi = len ? (struct ld_info *)((char *)ldi + len) : 0; |
ldi = len ? (struct ld_info *)((char *)ldi + len) : 0; |
Line 1032 void GC_register_dynamic_libraries() |
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Line 969 void GC_register_dynamic_libraries() |
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} |
} |
#endif /* RS6000 */ |
#endif /* RS6000 */ |
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#ifdef DARWIN |
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#include <mach-o/dyld.h> |
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#include <mach-o/getsect.h> |
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/*#define DARWIN_DEBUG*/ |
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const static struct { |
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const char *seg; |
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const char *sect; |
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} GC_dyld_sections[] = { |
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{ SEG_DATA, SECT_DATA }, |
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{ SEG_DATA, SECT_BSS }, |
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{ SEG_DATA, SECT_COMMON } |
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}; |
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#ifdef DARWIN_DEBUG |
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static const char *GC_dyld_name_for_hdr(struct mach_header *hdr) { |
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unsigned long i,c; |
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c = _dyld_image_count(); |
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for(i=0;i<c;i++) if(_dyld_get_image_header(i) == hdr) |
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return _dyld_get_image_name(i); |
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return NULL; |
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} |
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#endif |
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/* This should never be called by a thread holding the lock */ |
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static void GC_dyld_image_add(struct mach_header* hdr, unsigned long slide) { |
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unsigned long start,end,i; |
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const struct section *sec; |
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for(i=0;i<sizeof(GC_dyld_sections)/sizeof(GC_dyld_sections[0]);i++) { |
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sec = getsectbynamefromheader( |
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hdr,GC_dyld_sections[i].seg,GC_dyld_sections[i].sect); |
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if(sec == NULL || sec->size == 0) continue; |
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start = slide + sec->addr; |
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end = start + sec->size; |
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# ifdef DARWIN_DEBUG |
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GC_printf4("Adding section at %p-%p (%lu bytes) from image %s\n", |
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start,end,sec->size,GC_dyld_name_for_hdr(hdr)); |
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# endif |
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GC_add_roots((char*)start,(char*)end); |
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} |
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# ifdef DARWIN_DEBUG |
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GC_print_static_roots(); |
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# endif |
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} |
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/* This should never be called by a thread holding the lock */ |
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static void GC_dyld_image_remove(struct mach_header* hdr, unsigned long slide) { |
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unsigned long start,end,i; |
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const struct section *sec; |
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for(i=0;i<sizeof(GC_dyld_sections)/sizeof(GC_dyld_sections[0]);i++) { |
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sec = getsectbynamefromheader( |
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hdr,GC_dyld_sections[i].seg,GC_dyld_sections[i].sect); |
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if(sec == NULL || sec->size == 0) continue; |
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start = slide + sec->addr; |
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end = start + sec->size; |
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# ifdef DARWIN_DEBUG |
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GC_printf4("Removing section at %p-%p (%lu bytes) from image %s\n", |
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start,end,sec->size,GC_dyld_name_for_hdr(hdr)); |
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# endif |
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GC_remove_roots((char*)start,(char*)end); |
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} |
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# ifdef DARWIN_DEBUG |
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GC_print_static_roots(); |
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# endif |
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} |
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void GC_register_dynamic_libraries() { |
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/* Currently does nothing. The callbacks are setup by GC_init_dyld() |
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The dyld library takes it from there. */ |
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} |
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/* The _dyld_* functions have an internal lock so no _dyld functions |
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can be called while the world is stopped without the risk of a deadlock. |
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Because of this we MUST setup callbacks BEFORE we ever stop the world. |
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This should be called BEFORE any thread in created and WITHOUT the |
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allocation lock held. */ |
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void GC_init_dyld() { |
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static GC_bool initialized = FALSE; |
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if(initialized) return; |
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# ifdef DARWIN_DEBUG |
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GC_printf0("Forcing full bind of GC code...\n"); |
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# endif |
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if(!_dyld_bind_fully_image_containing_address((unsigned long*)GC_malloc)) |
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GC_abort("_dyld_bind_fully_image_containing_addres failed"); |
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# ifdef DARWIN_DEBUG |
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GC_printf0("Registering dyld callbacks...\n"); |
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# endif |
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/* Apple's Documentation: |
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When you call _dyld_register_func_for_add_image, the dynamic linker runtime |
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calls the specified callback (func) once for each of the images that is |
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currently loaded into the program. When a new image is added to the program, |
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your callback is called again with the mach_header for the new image, and the virtual memory slide amount of the new image. |
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This WILL properly register existing and all future libraries |
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*/ |
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_dyld_register_func_for_add_image(GC_dyld_image_add); |
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_dyld_register_func_for_remove_image(GC_dyld_image_remove); |
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initialized = TRUE; |
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} |
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#define HAVE_REGISTER_MAIN_STATIC_DATA |
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GC_bool GC_register_main_static_data() |
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{ |
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/* Already done through dyld callbacks */ |
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return FALSE; |
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} |
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#endif /* DARWIN */ |
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#else /* !DYNAMIC_LOADING */ |
#else /* !DYNAMIC_LOADING */ |
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#ifdef PCR |
#ifdef PCR |
Line 1080 void GC_register_dynamic_libraries(){} |
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Line 1132 void GC_register_dynamic_libraries(){} |
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int GC_no_dynamic_loading; |
int GC_no_dynamic_loading; |
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#endif /* !PCR */ |
#endif /* !PCR */ |
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#endif /* !DYNAMIC_LOADING */ |
#endif /* !DYNAMIC_LOADING */ |
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#ifndef HAVE_REGISTER_MAIN_STATIC_DATA |
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/* Do we need to separately register the main static data segment? */ |
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GC_bool GC_register_main_static_data() |
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{ |
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return TRUE; |
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} |
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#endif /* HAVE_REGISTER_MAIN_STATIC_DATA */ |
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