version 1.4, 2001/04/20 07:39:18 |
version 1.6, 2002/07/24 08:00:08 |
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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) |
--> 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 120 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 131 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 145 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 192 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 217 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 264 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 417 static char *parse_map_entry(char *buf_ptr, word *star |
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Line 439 static char *parse_map_entry(char *buf_ptr, word *star |
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return buf_ptr; |
return buf_ptr; |
} |
} |
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#else /* !USE_PROC_FOR_LIBRARIES */ |
#endif /* USE_PROC_FOR_LIBRARIES */ |
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#if !defined(USE_PROC_FOR_LIBRARIES) |
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/* 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 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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/* We have the header files for a glibc that includes dl_iterate_phdr. */ |
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/* It may still not be available in the library on the target system. */ |
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/* Thus we also treat it as a weak symbol. */ |
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#define HAVE_DL_ITERATE_PHDR |
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static int GC_register_dynlib_callback(info, size, ptr) |
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struct dl_phdr_info * info; |
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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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/* Make sure struct dl_phdr_info is at least as big as we need. */ |
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if (size < offsetof (struct dl_phdr_info, dlpi_phnum) |
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+ sizeof (info->dlpi_phnum)) |
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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; |
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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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} |
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return 0; |
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} |
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/* 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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int tmp = 0; |
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if (dl_iterate_phdr) { |
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dl_iterate_phdr(GC_register_dynlib_callback, &tmp); |
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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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} |
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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 527 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 561 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 609 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 674 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 688 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 719 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 744 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 672 void GC_register_dynamic_libraries() |
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Line 777 void GC_register_dynamic_libraries() |
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# endif |
# endif |
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# ifndef MSWINCE |
# ifndef MSWINCE |
extern GC_bool GC_win32s; |
extern GC_bool GC_no_win32_dlls; |
# endif |
# endif |
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void GC_register_dynamic_libraries() |
void GC_register_dynamic_libraries() |
Line 685 void GC_register_dynamic_libraries() |
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Line 790 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 959 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; |