version 1.4, 2001/04/20 07:39:18 |
version 1.7, 2003/06/24 05:11:32 |
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* None of this is safe with dlclose and incremental collection. |
* None of this is safe with dlclose and incremental collection. |
* But then not much of anything is safe in the presence of dlclose. |
* But then not much of anything is safe in the presence of dlclose. |
*/ |
*/ |
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#if defined(__linux__) && !defined(_GNU_SOURCE) |
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/* Can't test LINUX, since this must be define before other includes */ |
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# define _GNU_SOURCE |
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#endif |
#if !defined(MACOS) && !defined(_WIN32_WCE) |
#if !defined(MACOS) && !defined(_WIN32_WCE) |
# include <sys/types.h> |
# include <sys/types.h> |
#endif |
#endif |
#include "private/gc_priv.h" |
#include "private/gc_priv.h" |
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/* BTL: avoid circular redefinition of dlopen if SOLARIS_THREADS defined */ |
/* BTL: avoid circular redefinition of dlopen if GC_SOLARIS_THREADS defined */ |
# if (defined(LINUX_THREADS) || defined(SOLARIS_THREADS) \ |
# if (defined(GC_PTHREADS) || defined(GC_SOLARIS_THREADS)) \ |
|| defined(HPUX_THREADS) || defined(IRIX_THREADS)) && defined(dlopen) \ |
&& defined(dlopen) && !defined(GC_USE_LD_WRAP) |
&& !defined(GC_USE_LD_WRAP) |
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/* To support threads in Solaris, gc.h interposes on dlopen by */ |
/* To support threads in Solaris, gc.h interposes on dlopen by */ |
/* defining "dlopen" to be "GC_dlopen", which is implemented below. */ |
/* defining "dlopen" to be "GC_dlopen", which is implemented below. */ |
/* However, both GC_FirstDLOpenedLinkMap() and GC_dlopen() use the */ |
/* However, both GC_FirstDLOpenedLinkMap() and GC_dlopen() use the */ |
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!defined(MSWIN32) && !defined(MSWINCE) && \ |
!defined(MSWIN32) && !defined(MSWINCE) && \ |
!(defined(ALPHA) && defined(OSF1)) && \ |
!(defined(ALPHA) && defined(OSF1)) && \ |
!defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \ |
!defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \ |
!defined(RS6000) && !defined(SCO_ELF) && \ |
!defined(RS6000) && !defined(SCO_ELF) && !defined(DGUX) && \ |
!(defined(NETBSD) && defined(__ELF__)) |
!(defined(FREEBSD) && defined(__ELF__)) && \ |
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!(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. |
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# define l_name lm_name |
# define l_name lm_name |
#endif |
#endif |
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#if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \ |
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(defined(FREEBSD) && defined(__ELF__)) || defined(DGUX) || \ |
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(defined(NETBSD) && defined(__ELF__)) || defined(HURD) |
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# include <stddef.h> |
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# include <elf.h> |
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# include <link.h> |
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#endif |
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/* Newer versions of GNU/Linux define this macro. We |
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* define it similarly for any ELF systems that don't. */ |
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# ifndef ElfW |
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# if !defined(ELF_CLASS) || ELF_CLASS == ELFCLASS32 |
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# define ElfW(type) Elf32_##type |
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# else |
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# define ElfW(type) Elf64_##type |
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# endif |
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# endif |
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#if defined(SUNOS5DL) && !defined(USE_PROC_FOR_LIBRARIES) |
#if defined(SUNOS5DL) && !defined(USE_PROC_FOR_LIBRARIES) |
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#ifdef LINT |
#ifdef LINT |
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static struct link_map * |
static struct link_map * |
GC_FirstDLOpenedLinkMap() |
GC_FirstDLOpenedLinkMap() |
{ |
{ |
extern Elf32_Dyn _DYNAMIC; |
extern ElfW(Dyn) _DYNAMIC; |
Elf32_Dyn *dp; |
ElfW(Dyn) *dp; |
struct r_debug *r; |
struct r_debug *r; |
static struct link_map * cachedResult = 0; |
static struct link_map * cachedResult = 0; |
static Elf32_Dyn *dynStructureAddr = 0; |
static ElfW(Dyn) *dynStructureAddr = 0; |
/* BTL: added to avoid Solaris 5.3 ld.so _DYNAMIC bug */ |
/* BTL: added to avoid Solaris 5.3 ld.so _DYNAMIC bug */ |
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# ifdef SUNOS53_SHARED_LIB |
# ifdef SUNOS53_SHARED_LIB |
Line 99 GC_FirstDLOpenedLinkMap() |
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Line 121 GC_FirstDLOpenedLinkMap() |
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/* at program startup. */ |
/* at program startup. */ |
if( dynStructureAddr == 0 ) { |
if( dynStructureAddr == 0 ) { |
void* startupSyms = dlopen(0, RTLD_LAZY); |
void* startupSyms = dlopen(0, RTLD_LAZY); |
dynStructureAddr = (Elf32_Dyn*)dlsym(startupSyms, "_DYNAMIC"); |
dynStructureAddr = (ElfW(Dyn)*)dlsym(startupSyms, "_DYNAMIC"); |
} |
} |
# else |
# else |
dynStructureAddr = &_DYNAMIC; |
dynStructureAddr = &_DYNAMIC; |
Line 110 GC_FirstDLOpenedLinkMap() |
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Line 132 GC_FirstDLOpenedLinkMap() |
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} |
} |
if( cachedResult == 0 ) { |
if( cachedResult == 0 ) { |
int tag; |
int tag; |
for( dp = ((Elf32_Dyn *)(&_DYNAMIC)); (tag = dp->d_tag) != 0; dp++ ) { |
for( dp = ((ElfW(Dyn) *)(&_DYNAMIC)); (tag = dp->d_tag) != 0; dp++ ) { |
if( tag == DT_DEBUG ) { |
if( tag == DT_DEBUG ) { |
struct link_map *lm |
struct link_map *lm |
= ((struct r_debug *)(dp->d_un.d_ptr))->r_map; |
= ((struct r_debug *)(dp->d_un.d_ptr))->r_map; |
Line 124 GC_FirstDLOpenedLinkMap() |
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Line 146 GC_FirstDLOpenedLinkMap() |
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#endif /* SUNOS5DL ... */ |
#endif /* SUNOS5DL ... */ |
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/* BTL: added to fix circular dlopen definition if SOLARIS_THREADS defined */ |
/* BTL: added to fix circular dlopen definition if GC_SOLARIS_THREADS defined */ |
# if defined(GC_must_restore_redefined_dlopen) |
# if defined(GC_must_restore_redefined_dlopen) |
# define dlopen GC_dlopen |
# define dlopen GC_dlopen |
# endif |
# endif |
Line 171 static ptr_t GC_first_common() |
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Line 193 static ptr_t GC_first_common() |
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# if defined(SUNOS4) || defined(SUNOS5DL) |
# if defined(SUNOS4) || defined(SUNOS5DL) |
/* Add dynamic library data sections to the root set. */ |
/* Add dynamic library data sections to the root set. */ |
# if !defined(PCR) && !defined(SOLARIS_THREADS) && defined(THREADS) |
# if !defined(PCR) && !defined(GC_SOLARIS_THREADS) && defined(THREADS) |
# ifndef SRC_M3 |
# ifndef SRC_M3 |
--> fix mutual exclusion with dlopen |
--> fix mutual exclusion with dlopen |
# endif /* We assume M3 programs don't call dlopen for now */ |
# endif /* We assume M3 programs don't call dlopen for now */ |
Line 196 void GC_register_dynamic_libraries() |
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Line 218 void GC_register_dynamic_libraries() |
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TRUE); |
TRUE); |
# endif |
# endif |
# ifdef SUNOS5DL |
# ifdef SUNOS5DL |
Elf32_Ehdr * e; |
ElfW(Ehdr) * e; |
Elf32_Phdr * p; |
ElfW(Phdr) * p; |
unsigned long offset; |
unsigned long offset; |
char * start; |
char * start; |
register int i; |
register int i; |
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e = (Elf32_Ehdr *) lm->l_addr; |
e = (ElfW(Ehdr) *) lm->l_addr; |
p = ((Elf32_Phdr *)(((char *)(e)) + e->e_phoff)); |
p = ((ElfW(Phdr) *)(((char *)(e)) + e->e_phoff)); |
offset = ((unsigned long)(lm->l_addr)); |
offset = ((unsigned long)(lm->l_addr)); |
for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) { |
for( i = 0; i < (int)(e->e_phnum); ((i++),(p++)) ) { |
switch( p->p_type ) { |
switch( p->p_type ) { |
Line 243 void GC_register_dynamic_libraries() |
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Line 265 void GC_register_dynamic_libraries() |
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# endif /* SUNOS */ |
# endif /* SUNOS */ |
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#if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \ |
#if defined(LINUX) && defined(__ELF__) || defined(SCO_ELF) || \ |
(defined(NETBSD) && defined(__ELF__)) |
(defined(FREEBSD) && defined(__ELF__)) || defined(DGUX) || \ |
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(defined(NETBSD) && defined(__ELF__)) || defined(HURD) |
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#ifdef USE_PROC_FOR_LIBRARIES |
#ifdef USE_PROC_FOR_LIBRARIES |
Line 260 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 320 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 333 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 359 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 |
{ |
// locate all writable data segments that belong to shared libraries. |
if (!GC_apply_to_maps(GC_register_map_entries)) |
// The format of one of these entries and the fields we care about |
ABORT("Failed to read /proc for library registration."); |
// is as follows: |
} |
// 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, |
/* We now take care of the main data segment ourselves: */ |
char *prot_buf, unsigned int *maj_dev) |
GC_bool GC_register_main_static_data() |
{ |
{ |
int i; |
return FALSE; |
unsigned int val; |
} |
char *tok; |
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# define HAVE_REGISTER_MAIN_STATIC_DATA |
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if (buf_ptr == NULL || *buf_ptr == '\0') { |
#endif /* USE_PROC_FOR_LIBRARIES */ |
return NULL; |
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} |
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memcpy(prot_buf, buf_ptr+OFFSET_MAP_PROT, 4); // do the protections first |
#if !defined(USE_PROC_FOR_LIBRARIES) |
prot_buf[4] = '\0'; |
/* The following is the preferred way to walk dynamic libraries */ |
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/* For glibc 2.2.4+. Unfortunately, it doesn't work for older */ |
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/* versions. Thanks to Jakub Jelinek for most of the code. */ |
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if (prot_buf[1] == 'w') { // we can skip all of this if it's not writable |
# if defined(LINUX) /* Are others OK here, too? */ \ |
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&& (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \ |
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|| (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG))) |
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tok = buf_ptr; |
/* We have the header files for a glibc that includes dl_iterate_phdr. */ |
buf_ptr[OFFSET_MAP_START+8] = '\0'; |
/* It may still not be available in the library on the target system. */ |
*start = strtoul(tok, NULL, 16); |
/* Thus we also treat it as a weak symbol. */ |
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#define HAVE_DL_ITERATE_PHDR |
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tok = buf_ptr+OFFSET_MAP_END; |
static int GC_register_dynlib_callback(info, size, ptr) |
buf_ptr[OFFSET_MAP_END+8] = '\0'; |
struct dl_phdr_info * info; |
*end = strtoul(tok, NULL, 16); |
size_t size; |
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void * ptr; |
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{ |
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const ElfW(Phdr) * p; |
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char * start; |
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register int i; |
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buf_ptr += OFFSET_MAP_MAJDEV; |
/* Make sure struct dl_phdr_info is at least as big as we need. */ |
tok = buf_ptr; |
if (size < offsetof (struct dl_phdr_info, dlpi_phnum) |
while (*buf_ptr != ':') buf_ptr++; |
+ sizeof (info->dlpi_phnum)) |
*buf_ptr++ = '\0'; |
return -1; |
*maj_dev = strtoul(tok, NULL, 16); |
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p = info->dlpi_phdr; |
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for( i = 0; i < (int)(info->dlpi_phnum); ((i++),(p++)) ) { |
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switch( p->p_type ) { |
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case PT_LOAD: |
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{ |
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if( !(p->p_flags & PF_W) ) break; |
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start = ((char *)(p->p_vaddr)) + info->dlpi_addr; |
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GC_add_roots_inner(start, start + p->p_memsz, TRUE); |
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} |
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break; |
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default: |
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break; |
} |
} |
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} |
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while (*buf_ptr && *buf_ptr++ != '\n'); |
* (int *)ptr = 1; /* Signal that we were called */ |
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return 0; |
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} |
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return buf_ptr; |
/* Return TRUE if we succeed, FALSE if dl_iterate_phdr wasn't there. */ |
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#pragma weak dl_iterate_phdr |
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GC_bool GC_register_dynamic_libraries_dl_iterate_phdr() |
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{ |
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if (dl_iterate_phdr) { |
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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; |
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} else { |
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return FALSE; |
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} |
} |
} |
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#else /* !USE_PROC_FOR_LIBRARIES */ |
/* 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 */ |
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/* Dynamic loading code for Linux running ELF. Somewhat tested on |
/* Dynamic loading code for Linux running ELF. Somewhat tested on |
* Linux/x86, untested but hopefully should work on Linux/Alpha. |
* Linux/x86, untested but hopefully should work on Linux/Alpha. |
* This code was derived from the Solaris/ELF support. Thanks to |
* This code was derived from the Solaris/ELF support. Thanks to |
* whatever kind soul wrote that. - Patrick Bridges */ |
* whatever kind soul wrote that. - Patrick Bridges */ |
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/* This doesn't necessarily work in all cases, e.g. with preloaded |
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* dynamic libraries. */ |
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#if defined(NETBSD) |
#if defined(NETBSD) |
# include <sys/exec_elf.h> |
# include <sys/exec_elf.h> |
#else |
#else |
Line 431 static char *parse_map_entry(char *buf_ptr, word *star |
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Line 451 static char *parse_map_entry(char *buf_ptr, word *star |
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#endif |
#endif |
#include <link.h> |
#include <link.h> |
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/* Newer versions of Linux/Alpha and Linux/x86 define this macro. We |
# endif |
* define it for those older versions that don't. */ |
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# ifndef ElfW |
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# if !defined(ELF_CLASS) || ELF_CLASS == ELFCLASS32 |
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# define ElfW(type) Elf32_##type |
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# else |
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# define ElfW(type) Elf64_##type |
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# endif |
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# endif |
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#ifdef __GNUC__ |
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# pragma weak _DYNAMIC |
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#endif |
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extern ElfW(Dyn) _DYNAMIC[]; |
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static struct link_map * |
static struct link_map * |
GC_FirstDLOpenedLinkMap() |
GC_FirstDLOpenedLinkMap() |
{ |
{ |
# ifdef __GNUC__ |
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# pragma weak _DYNAMIC |
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# endif |
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extern ElfW(Dyn) _DYNAMIC[]; |
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ElfW(Dyn) *dp; |
ElfW(Dyn) *dp; |
struct r_debug *r; |
struct r_debug *r; |
static struct link_map *cachedResult = 0; |
static struct link_map *cachedResult = 0; |
Line 472 GC_FirstDLOpenedLinkMap() |
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Line 485 GC_FirstDLOpenedLinkMap() |
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void GC_register_dynamic_libraries() |
void GC_register_dynamic_libraries() |
{ |
{ |
struct link_map *lm = GC_FirstDLOpenedLinkMap(); |
struct link_map *lm; |
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# ifdef HAVE_DL_ITERATE_PHDR |
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if (GC_register_dynamic_libraries_dl_iterate_phdr()) { |
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return; |
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} |
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# endif |
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lm = GC_FirstDLOpenedLinkMap(); |
for (lm = GC_FirstDLOpenedLinkMap(); |
for (lm = GC_FirstDLOpenedLinkMap(); |
lm != (struct link_map *) 0; lm = lm->l_next) |
lm != (struct link_map *) 0; lm = lm->l_next) |
{ |
{ |
Line 514 void GC_register_dynamic_libraries() |
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Line 533 void GC_register_dynamic_libraries() |
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#include <fcntl.h> |
#include <fcntl.h> |
#include <elf.h> |
#include <elf.h> |
#include <errno.h> |
#include <errno.h> |
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#include <signal.h> /* Only for the following test. */ |
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#ifndef _sigargs |
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# define IRIX6 |
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#endif |
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extern void * GC_roots_present(); |
extern void * GC_roots_present(); |
/* The type is a lie, since the real type doesn't make sense here, */ |
/* The type is a lie, since the real type doesn't make sense here, */ |
Line 575 void GC_register_dynamic_libraries() |
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Line 598 void GC_register_dynamic_libraries() |
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if ((flags & (MA_BREAK | MA_STACK | MA_PHYS)) != 0) goto irrelevant; |
if ((flags & (MA_BREAK | MA_STACK | MA_PHYS)) != 0) goto irrelevant; |
if ((flags & (MA_READ | MA_WRITE)) != (MA_READ | MA_WRITE)) |
if ((flags & (MA_READ | MA_WRITE)) != (MA_READ | MA_WRITE)) |
goto irrelevant; |
goto irrelevant; |
/* The latter test is empirically useless. Other than the */ |
/* The latter test is empirically useless in very old Irix */ |
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/* versions. Other than the */ |
/* main data and stack segments, everything appears to be */ |
/* main data and stack segments, everything appears to be */ |
/* mapped readable, writable, executable, and shared(!!). */ |
/* mapped readable, writable, executable, and shared(!!). */ |
/* This makes no sense to me. - HB */ |
/* This makes no sense to me. - HB */ |
Line 588 void GC_register_dynamic_libraries() |
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Line 612 void GC_register_dynamic_libraries() |
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# endif /* MMAP_STACKS */ |
# endif /* MMAP_STACKS */ |
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limit = start + addr_map[i].pr_size; |
limit = start + addr_map[i].pr_size; |
if (addr_map[i].pr_off == 0 && strncmp(start, ELFMAG, 4) == 0) { |
/* The following seemed to be necessary for very old versions */ |
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/* of Irix, but it has been reported to discard relevant */ |
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/* segments under Irix 6.5. */ |
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# ifndef IRIX6 |
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if (addr_map[i].pr_off == 0 && strncmp(start, ELFMAG, 4) == 0) { |
/* Discard text segments, i.e. 0-offset mappings against */ |
/* Discard text segments, i.e. 0-offset mappings against */ |
/* executable files which appear to have ELF headers. */ |
/* executable files which appear to have ELF headers. */ |
caddr_t arg; |
caddr_t arg; |
Line 615 void GC_register_dynamic_libraries() |
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Line 643 void GC_register_dynamic_libraries() |
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goto irrelevant; |
goto irrelevant; |
} |
} |
} |
} |
} |
} |
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# endif /* !IRIX6 */ |
GC_add_roots_inner(start, limit, TRUE); |
GC_add_roots_inner(start, limit, TRUE); |
irrelevant: ; |
irrelevant: ; |
} |
} |
Line 639 void GC_register_dynamic_libraries() |
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Line 668 void GC_register_dynamic_libraries() |
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extern GC_bool GC_is_heap_base (ptr_t p); |
extern GC_bool GC_is_heap_base (ptr_t p); |
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# ifdef WIN32_THREADS |
# ifdef GC_WIN32_THREADS |
extern void GC_get_next_stack(char *start, char **lo, char **hi); |
extern void GC_get_next_stack(char *start, char **lo, char **hi); |
void GC_cond_add_roots(char *base, char * limit) |
void GC_cond_add_roots(char *base, char * limit) |
{ |
{ |
Line 671 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 |
extern GC_bool GC_win32s; |
/* Do we need to separately register the main static data segment? */ |
# endif |
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 */ |
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extern GC_bool GC_no_win32_dlls; |
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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 685 void GC_register_dynamic_libraries() |
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Line 727 void GC_register_dynamic_libraries() |
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char * limit, * new_limit; |
char * limit, * new_limit; |
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# ifdef MSWIN32 |
# ifdef MSWIN32 |
if (GC_win32s) return; |
if (GC_no_win32_dlls) return; |
# endif |
# endif |
base = limit = p = GC_sysinfo.lpMinimumApplicationAddress; |
base = limit = p = GC_sysinfo.lpMinimumApplicationAddress; |
# if defined(MSWINCE) && !defined(_WIN32_WCE_EMULATION) |
# if defined(MSWINCE) && !defined(_WIN32_WCE_EMULATION) |
Line 854 void GC_register_dynamic_libraries() |
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Line 896 void GC_register_dynamic_libraries() |
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/* Check if this is the end of the list or if some error occured */ |
/* Check if this is the end of the list or if some error occured */ |
if (status != 0) { |
if (status != 0) { |
# ifdef HPUX_THREADS |
# ifdef GC_HPUX_THREADS |
/* I've seen errno values of 0. The man page is not clear */ |
/* I've seen errno values of 0. The man page is not clear */ |
/* as to whether errno should get set on a -1 return. */ |
/* as to whether errno should get set on a -1 return. */ |
break; |
break; |
Line 919 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 927 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 975 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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|
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#ifndef HAVE_REGISTER_MAIN_STATIC_DATA |
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|
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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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