--- /dev/null
+/*
+ * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
+ * Copyright (c) 1997 by Silicon Graphics. All rights reserved.
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ *
+ * Original author: Bill Janssen
+ * Heavily modified by Hans Boehm and others
+ */
+
+#include "private/gc_priv.h"
+
+/*
+ * This is incredibly OS specific code for tracking down data sections in
+ * dynamic libraries. There appears to be no way of doing this quickly
+ * without groveling through undocumented data structures. We would argue
+ * that this is a bug in the design of the dlopen interface. THIS CODE
+ * MAY BREAK IN FUTURE OS RELEASES. If this matters to you, don't hesitate
+ * to let your vendor know ...
+ *
+ * None of this is safe with dlclose and incremental collection.
+ * But then not much of anything is safe in the presence of dlclose.
+ */
+
+#if !defined(MACOS) && !defined(_WIN32_WCE) && !defined(__CC_ARM)
+# include <sys/types.h>
+#endif
+
+/* BTL: avoid circular redefinition of dlopen if GC_SOLARIS_THREADS defined */
+#undef GC_MUST_RESTORE_REDEFINED_DLOPEN
+#if defined(GC_PTHREADS) && !defined(GC_NO_DLOPEN) \
+ && !defined(GC_NO_THREAD_REDIRECTS) && !defined(GC_USE_LD_WRAP)
+ /* To support threads in Solaris, gc.h interposes on dlopen by */
+ /* defining "dlopen" to be "GC_dlopen", which is implemented below. */
+ /* However, both GC_FirstDLOpenedLinkMap() and GC_dlopen() use the */
+ /* real system dlopen() in their implementation. We first remove */
+ /* gc.h's dlopen definition and restore it later, after GC_dlopen(). */
+# undef dlopen
+# define GC_MUST_RESTORE_REDEFINED_DLOPEN
+#endif /* !GC_NO_DLOPEN */
+
+/* A user-supplied routine (custom filter) that might be called to */
+/* determine whether a DSO really needs to be scanned by the GC. */
+/* 0 means no filter installed. May be unused on some platforms. */
+/* FIXME: Add filter support for more platforms. */
+STATIC GC_has_static_roots_func GC_has_static_roots = 0;
+
+#if (defined(DYNAMIC_LOADING) || defined(MSWIN32) || defined(MSWINCE) \
+ || defined(CYGWIN32)) && !defined(PCR)
+
+#if !defined(SOLARISDL) && !defined(IRIX5) && \
+ !defined(MSWIN32) && !defined(MSWINCE) && !defined(CYGWIN32) && \
+ !(defined(ALPHA) && defined(OSF1)) && \
+ !defined(HPUX) && !(defined(LINUX) && defined(__ELF__)) && \
+ !defined(AIX) && !defined(SCO_ELF) && !defined(DGUX) && \
+ !(defined(FREEBSD) && defined(__ELF__)) && \
+ !(defined(OPENBSD) && (defined(__ELF__) || defined(M68K))) && \
+ !(defined(NETBSD) && defined(__ELF__)) && !defined(HURD) && \
+ !defined(DARWIN) && !defined(CYGWIN32)
+ --> We only know how to find data segments of dynamic libraries for the
+ --> above. Additional SVR4 variants might not be too
+ --> hard to add.
+#endif
+
+#include <stdio.h>
+#ifdef SOLARISDL
+# include <sys/elf.h>
+# include <dlfcn.h>
+# include <link.h>
+#endif
+
+#if defined(NETBSD)
+# include <sys/param.h>
+# include <dlfcn.h>
+# include <machine/elf_machdep.h>
+# define ELFSIZE ARCH_ELFSIZE
+#endif
+
+#if defined(SCO_ELF) || defined(DGUX) || defined(HURD) \
+ || (defined(__ELF__) && (defined(LINUX) || defined(FREEBSD) \
+ || defined(NETBSD) || defined(OPENBSD)))
+# include <stddef.h>
+# if !defined(OPENBSD) && !defined(PLATFORM_ANDROID)
+ /* FIXME: Why we exclude it for OpenBSD? */
+ /* Exclude Android because linker.h below includes its own version. */
+# include <elf.h>
+# endif
+# ifdef PLATFORM_ANDROID
+ /* The header file is in "bionic/linker" folder of Android sources. */
+ /* If you don't need the "dynamic loading" feature, you may build */
+ /* the collector with -D IGNORE_DYNAMIC_LOADING. */
+# include <linker.h>
+# else
+# include <link.h>
+# endif
+#endif
+
+/* Newer versions of GNU/Linux define this macro. We
+ * define it similarly for any ELF systems that don't. */
+# ifndef ElfW
+# if defined(FREEBSD)
+# if __ELF_WORD_SIZE == 32
+# define ElfW(type) Elf32_##type
+# else
+# define ElfW(type) Elf64_##type
+# endif
+# elif defined(NETBSD) || defined(OPENBSD)
+# if ELFSIZE == 32
+# define ElfW(type) Elf32_##type
+# else
+# define ElfW(type) Elf64_##type
+# endif
+# else
+# if !defined(ELF_CLASS) || ELF_CLASS == ELFCLASS32
+# define ElfW(type) Elf32_##type
+# else
+# define ElfW(type) Elf64_##type
+# endif
+# endif
+# endif
+
+#if defined(SOLARISDL) && !defined(USE_PROC_FOR_LIBRARIES)
+
+#ifdef LINT
+ Elf32_Dyn _DYNAMIC;
+#endif
+
+STATIC struct link_map *
+GC_FirstDLOpenedLinkMap(void)
+{
+ extern ElfW(Dyn) _DYNAMIC;
+ ElfW(Dyn) *dp;
+ static struct link_map * cachedResult = 0;
+ static ElfW(Dyn) *dynStructureAddr = 0;
+ /* BTL: added to avoid Solaris 5.3 ld.so _DYNAMIC bug */
+
+# ifdef SUNOS53_SHARED_LIB
+ /* BTL: Avoid the Solaris 5.3 bug that _DYNAMIC isn't being set */
+ /* up properly in dynamically linked .so's. This means we have */
+ /* to use its value in the set of original object files loaded */
+ /* at program startup. */
+ if( dynStructureAddr == 0 ) {
+ void* startupSyms = dlopen(0, RTLD_LAZY);
+ dynStructureAddr = (ElfW(Dyn)*)dlsym(startupSyms, "_DYNAMIC");
+ }
+# else
+ dynStructureAddr = &_DYNAMIC;
+# endif
+
+ if( dynStructureAddr == 0) {
+ return(0);
+ }
+ if( cachedResult == 0 ) {
+ int tag;
+ for( dp = ((ElfW(Dyn) *)(&_DYNAMIC)); (tag = dp->d_tag) != 0; dp++ ) {
+ if( tag == DT_DEBUG ) {
+ struct link_map *lm
+ = ((struct r_debug *)(dp->d_un.d_ptr))->r_map;
+ if( lm != 0 ) cachedResult = lm->l_next; /* might be NULL */
+ break;
+ }
+ }
+ }
+ return cachedResult;
+}
+
+#endif /* SOLARISDL ... */
+
+/* BTL: added to fix circular dlopen definition if GC_SOLARIS_THREADS defined */
+# ifdef GC_MUST_RESTORE_REDEFINED_DLOPEN
+# define dlopen GC_dlopen
+# endif
+
+# if defined(SOLARISDL)
+/* Add dynamic library data sections to the root set. */
+# if !defined(PCR) && !defined(GC_SOLARIS_THREADS) && defined(THREADS)
+ --> fix mutual exclusion with dlopen
+# endif
+
+# ifndef USE_PROC_FOR_LIBRARIES
+GC_INNER void GC_register_dynamic_libraries(void)
+{
+ struct link_map *lm;
+
+ for (lm = GC_FirstDLOpenedLinkMap(); lm != 0; lm = lm->l_next) {
+ ElfW(Ehdr) * e;
+ ElfW(Phdr) * p;
+ unsigned long offset;
+ char * start;
+ int i;
+
+ e = (ElfW(Ehdr) *) lm->l_addr;
+# ifdef PLATFORM_ANDROID
+ if (e == NULL)
+ continue;
+# endif
+ p = ((ElfW(Phdr) *)(((char *)(e)) + e->e_phoff));
+ offset = ((unsigned long)(lm->l_addr));
+ for( i = 0; i < (int)e->e_phnum; i++, p++ ) {
+ switch( p->p_type ) {
+ case PT_LOAD:
+ {
+ if( !(p->p_flags & PF_W) ) break;
+ start = ((char *)(p->p_vaddr)) + offset;
+ GC_add_roots_inner(
+ start,
+ start + p->p_memsz,
+ TRUE
+ );
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ }
+}
+
+# endif /* !USE_PROC ... */
+# endif /* SOLARISDL */
+
+#if defined(SCO_ELF) || defined(DGUX) || defined(HURD) \
+ || (defined(__ELF__) && (defined(LINUX) || defined(FREEBSD) \
+ || defined(NETBSD) || defined(OPENBSD)))
+
+#ifdef USE_PROC_FOR_LIBRARIES
+
+#include <string.h>
+
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#define MAPS_BUF_SIZE (32*1024)
+
+/* Sort an array of HeapSects by start address. */
+/* Unfortunately at least some versions of */
+/* Linux qsort end up calling malloc by way of sysconf, and hence can't */
+/* be used in the collector. Hence we roll our own. Should be */
+/* reasonably fast if the array is already mostly sorted, as we expect */
+/* it to be. */
+static void sort_heap_sects(struct HeapSect *base, size_t number_of_elements)
+{
+ signed_word n = (signed_word)number_of_elements;
+ signed_word nsorted = 1;
+ signed_word i;
+
+ while (nsorted < n) {
+ while (nsorted < n &&
+ base[nsorted-1].hs_start < base[nsorted].hs_start)
+ ++nsorted;
+ if (nsorted == n) break;
+ GC_ASSERT(base[nsorted-1].hs_start > base[nsorted].hs_start);
+ i = nsorted - 1;
+ while (i >= 0 && base[i].hs_start > base[i+1].hs_start) {
+ struct HeapSect tmp = base[i];
+ base[i] = base[i+1];
+ base[i+1] = tmp;
+ --i;
+ }
+ GC_ASSERT(base[nsorted-1].hs_start < base[nsorted].hs_start);
+ ++nsorted;
+ }
+}
+
+STATIC word GC_register_map_entries(char *maps)
+{
+ char *prot;
+ char *buf_ptr = maps;
+ ptr_t start, end;
+ unsigned int maj_dev;
+ ptr_t least_ha, greatest_ha;
+ unsigned i;
+ ptr_t datastart;
+
+# ifdef DATASTART_IS_FUNC
+ static ptr_t datastart_cached = (ptr_t)(word)-1;
+
+ /* Evaluate DATASTART only once. */
+ if (datastart_cached == (ptr_t)(word)-1) {
+ datastart_cached = (ptr_t)(DATASTART);
+ }
+ datastart = datastart_cached;
+# else
+ datastart = (ptr_t)(DATASTART);
+# endif
+
+ GC_ASSERT(I_HOLD_LOCK());
+ sort_heap_sects(GC_our_memory, GC_n_memory);
+ least_ha = GC_our_memory[0].hs_start;
+ greatest_ha = GC_our_memory[GC_n_memory-1].hs_start
+ + GC_our_memory[GC_n_memory-1].hs_bytes;
+
+ for (;;) {
+ buf_ptr = GC_parse_map_entry(buf_ptr, &start, &end, &prot,
+ &maj_dev, 0);
+ if (buf_ptr == NULL) return 1;
+ if (prot[1] == 'w') {
+ /* This is a writable mapping. Add it to */
+ /* the root set unless it is already otherwise */
+ /* accounted for. */
+ if (start <= GC_stackbottom && end >= GC_stackbottom) {
+ /* Stack mapping; discard */
+ continue;
+ }
+# ifdef THREADS
+ /* This may fail, since a thread may already be */
+ /* unregistered, but its thread stack may still be there. */
+ /* That can fail because the stack may disappear while */
+ /* we're marking. Thus the marker is, and has to be */
+ /* prepared to recover from segmentation faults. */
+
+ if (GC_segment_is_thread_stack(start, end)) continue;
+
+ /* FIXME: NPTL squirrels */
+ /* away pointers in pieces of the stack segment that we */
+ /* don't scan. We work around this */
+ /* by treating anything allocated by libpthread as */
+ /* uncollectable, as we do in some other cases. */
+ /* A specifically identified problem is that */
+ /* thread stacks contain pointers to dynamic thread */
+ /* vectors, which may be reused due to thread caching. */
+ /* They may not be marked if the thread is still live. */
+ /* This specific instance should be addressed by */
+ /* INCLUDE_LINUX_THREAD_DESCR, but that doesn't quite */
+ /* seem to suffice. */
+ /* We currently trace entire thread stacks, if they are */
+ /* are currently cached but unused. This is */
+ /* very suboptimal for performance reasons. */
+# endif
+ /* We no longer exclude the main data segment. */
+ if (end <= least_ha || start >= greatest_ha) {
+ /* The easy case; just trace entire segment */
+ GC_add_roots_inner((char *)start, (char *)end, TRUE);
+ continue;
+ }
+ /* Add sections that don't belong to us. */
+ i = 0;
+ while (GC_our_memory[i].hs_start + GC_our_memory[i].hs_bytes
+ < start)
+ ++i;
+ GC_ASSERT(i < GC_n_memory);
+ if (GC_our_memory[i].hs_start <= start) {
+ start = GC_our_memory[i].hs_start
+ + GC_our_memory[i].hs_bytes;
+ ++i;
+ }
+ while (i < GC_n_memory && GC_our_memory[i].hs_start < end
+ && start < end) {
+ if ((char *)start < GC_our_memory[i].hs_start)
+ GC_add_roots_inner((char *)start,
+ GC_our_memory[i].hs_start, TRUE);
+ start = GC_our_memory[i].hs_start
+ + GC_our_memory[i].hs_bytes;
+ ++i;
+ }
+ if (start < end)
+ GC_add_roots_inner((char *)start, (char *)end, TRUE);
+ }
+ }
+ return 1;
+}
+
+GC_INNER void GC_register_dynamic_libraries(void)
+{
+ if (!GC_register_map_entries(GC_get_maps()))
+ ABORT("Failed to read /proc for library registration");
+}
+
+/* We now take care of the main data segment ourselves: */
+GC_INNER GC_bool GC_register_main_static_data(void)
+{
+ return FALSE;
+}
+
+# define HAVE_REGISTER_MAIN_STATIC_DATA
+
+#else /* !USE_PROC_FOR_LIBRARIES */
+
+/* The following is the preferred way to walk dynamic libraries */
+/* For glibc 2.2.4+. Unfortunately, it doesn't work for older */
+/* versions. Thanks to Jakub Jelinek for most of the code. */
+
+#if (defined(LINUX) || defined (__GLIBC__)) /* Are others OK here, too? */ \
+ && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
+ || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
+/* We have the header files for a glibc that includes dl_iterate_phdr. */
+/* It may still not be available in the library on the target system. */
+/* Thus we also treat it as a weak symbol. */
+# define HAVE_DL_ITERATE_PHDR
+# pragma weak dl_iterate_phdr
+#endif
+
+#if (defined(FREEBSD) && __FreeBSD__ >= 7)
+ /* On the FreeBSD system, any target system at major version 7 shall */
+ /* have dl_iterate_phdr; therefore, we need not make it weak as above. */
+# define HAVE_DL_ITERATE_PHDR
+# define DL_ITERATE_PHDR_STRONG
+#endif
+
+#if defined(HAVE_DL_ITERATE_PHDR)
+
+# ifdef PT_GNU_RELRO
+/* Instead of registering PT_LOAD sections directly, we keep them */
+/* in a temporary list, and filter them by excluding PT_GNU_RELRO */
+/* segments. Processing PT_GNU_RELRO sections with */
+/* GC_exclude_static_roots instead would be superficially cleaner. But */
+/* it runs into trouble if a client registers an overlapping segment, */
+/* which unfortunately seems quite possible. */
+
+# define MAX_LOAD_SEGS MAX_ROOT_SETS
+
+ static struct load_segment {
+ ptr_t start;
+ ptr_t end;
+ /* Room for a second segment if we remove a RELRO segment */
+ /* from the middle. */
+ ptr_t start2;
+ ptr_t end2;
+ } load_segs[MAX_LOAD_SEGS];
+
+ static int n_load_segs;
+# endif /* PT_GNU_RELRO */
+
+STATIC int GC_register_dynlib_callback(struct dl_phdr_info * info,
+ size_t size, void * ptr)
+{
+ const ElfW(Phdr) * p;
+ ptr_t start, end;
+ int i;
+
+ /* Make sure struct dl_phdr_info is at least as big as we need. */
+ if (size < offsetof (struct dl_phdr_info, dlpi_phnum)
+ + sizeof (info->dlpi_phnum))
+ return -1;
+
+ p = info->dlpi_phdr;
+ for( i = 0; i < (int)info->dlpi_phnum; i++, p++ ) {
+ switch( p->p_type ) {
+# ifdef PT_GNU_RELRO
+ case PT_GNU_RELRO:
+ /* This entry is known to be constant and will eventually be remapped
+ read-only. However, the address range covered by this entry is
+ typically a subset of a previously encountered `LOAD' segment, so
+ we need to exclude it. */
+ {
+ int j;
+
+ start = ((ptr_t)(p->p_vaddr)) + info->dlpi_addr;
+ end = start + p->p_memsz;
+ for (j = n_load_segs; --j >= 0; ) {
+ if (start >= load_segs[j].start && start < load_segs[j].end) {
+ if (load_segs[j].start2 != 0) {
+ WARN("More than one GNU_RELRO segment per load seg\n",0);
+ } else {
+ GC_ASSERT(end <= load_segs[j].end);
+ /* Remove from the existing load segment */
+ load_segs[j].end2 = load_segs[j].end;
+ load_segs[j].end = start;
+ load_segs[j].start2 = end;
+ }
+ break;
+ }
+ if (j == 0) WARN("Failed to find PT_GNU_RELRO segment"
+ " inside PT_LOAD region", 0);
+ }
+ }
+
+ break;
+# endif
+
+ case PT_LOAD:
+ {
+ GC_has_static_roots_func callback = GC_has_static_roots;
+ if( !(p->p_flags & PF_W) ) break;
+ start = ((char *)(p->p_vaddr)) + info->dlpi_addr;
+ end = start + p->p_memsz;
+
+ if (callback != 0 && !callback(info->dlpi_name, start, p->p_memsz))
+ break;
+# ifdef PT_GNU_RELRO
+ if (n_load_segs >= MAX_LOAD_SEGS) ABORT("Too many PT_LOAD segs");
+# if CPP_WORDSZ == 64
+ /* FIXME: GC_push_all eventually does the correct */
+ /* rounding to the next multiple of ALIGNMENT, so, most */
+ /* probably, we should remove the corresponding assertion */
+ /* check in GC_add_roots_inner along with this code line. */
+ /* start pointer value may require aligning */
+ start = (ptr_t)((word)start & ~(sizeof(word) - 1));
+# endif
+ load_segs[n_load_segs].start = start;
+ load_segs[n_load_segs].end = end;
+ load_segs[n_load_segs].start2 = 0;
+ load_segs[n_load_segs].end2 = 0;
+ ++n_load_segs;
+# else
+ GC_add_roots_inner(start, end, TRUE);
+# endif /* PT_GNU_RELRO */
+ }
+ break;
+ default:
+ break;
+ }
+ }
+
+ *(int *)ptr = 1; /* Signal that we were called */
+ return 0;
+}
+
+/* Do we need to separately register the main static data segment? */
+GC_INNER GC_bool GC_register_main_static_data(void)
+{
+# ifdef DL_ITERATE_PHDR_STRONG
+ /* If dl_iterate_phdr is not a weak symbol then don't test against */
+ /* zero (otherwise a compiler might issue a warning). */
+ return FALSE;
+# else
+ return (dl_iterate_phdr == 0); /* implicit conversion to function ptr */
+# endif
+}
+
+/* Return TRUE if we succeed, FALSE if dl_iterate_phdr wasn't there. */
+STATIC GC_bool GC_register_dynamic_libraries_dl_iterate_phdr(void)
+{
+ int did_something;
+ if (GC_register_main_static_data())
+ return FALSE;
+
+# ifdef PT_GNU_RELRO
+ {
+ static GC_bool excluded_segs = FALSE;
+ n_load_segs = 0;
+ if (!excluded_segs) {
+ GC_exclude_static_roots_inner((ptr_t)load_segs,
+ (ptr_t)load_segs + sizeof(load_segs));
+ excluded_segs = TRUE;
+ }
+ }
+# endif
+
+ did_something = 0;
+ dl_iterate_phdr(GC_register_dynlib_callback, &did_something);
+ if (did_something) {
+# ifdef PT_GNU_RELRO
+ int i;
+
+ for (i = 0; i < n_load_segs; ++i) {
+ if (load_segs[i].end > load_segs[i].start) {
+ GC_add_roots_inner(load_segs[i].start, load_segs[i].end, TRUE);
+ }
+ if (load_segs[i].end2 > load_segs[i].start2) {
+ GC_add_roots_inner(load_segs[i].start2, load_segs[i].end2, TRUE);
+ }
+ }
+# endif
+ } else {
+ char *datastart;
+ char *dataend;
+# ifdef DATASTART_IS_FUNC
+ static ptr_t datastart_cached = (ptr_t)(word)-1;
+
+ /* Evaluate DATASTART only once. */
+ if (datastart_cached == (ptr_t)(word)-1) {
+ datastart_cached = (ptr_t)(DATASTART);
+ }
+ datastart = (char *)datastart_cached;
+# else
+ datastart = DATASTART;
+# endif
+# ifdef DATAEND_IS_FUNC
+ {
+ static ptr_t dataend_cached = 0;
+ /* Evaluate DATAEND only once. */
+ if (dataend_cached == 0) {
+ dataend_cached = (ptr_t)(DATAEND);
+ }
+ dataend = (char *)dataend_cached;
+ }
+# else
+ dataend = DATAEND;
+# endif
+
+ /* dl_iterate_phdr may forget the static data segment in */
+ /* statically linked executables. */
+ GC_add_roots_inner(datastart, dataend, TRUE);
+# if defined(DATASTART2)
+ GC_add_roots_inner(DATASTART2, (char *)(DATAEND2), TRUE);
+# endif
+ }
+ return TRUE;
+}
+
+# define HAVE_REGISTER_MAIN_STATIC_DATA
+
+#else /* !HAVE_DL_ITERATE_PHDR */
+
+/* Dynamic loading code for Linux running ELF. Somewhat tested on
+ * Linux/x86, untested but hopefully should work on Linux/Alpha.
+ * This code was derived from the Solaris/ELF support. Thanks to
+ * whatever kind soul wrote that. - Patrick Bridges */
+
+/* This doesn't necessarily work in all cases, e.g. with preloaded
+ * dynamic libraries. */
+
+# if defined(NETBSD) || defined(OPENBSD)
+# include <sys/exec_elf.h>
+ /* for compatibility with 1.4.x */
+# ifndef DT_DEBUG
+# define DT_DEBUG 21
+# endif
+# ifndef PT_LOAD
+# define PT_LOAD 1
+# endif
+# ifndef PF_W
+# define PF_W 2
+# endif
+# elif !defined(PLATFORM_ANDROID)
+# include <elf.h>
+# endif
+
+# ifndef PLATFORM_ANDROID
+# include <link.h>
+# endif
+
+#endif /* !HAVE_DL_ITERATE_PHDR */
+
+#ifdef __GNUC__
+# pragma weak _DYNAMIC
+#endif
+extern ElfW(Dyn) _DYNAMIC[];
+
+STATIC struct link_map *
+GC_FirstDLOpenedLinkMap(void)
+{
+ ElfW(Dyn) *dp;
+ static struct link_map *cachedResult = 0;
+
+ if( _DYNAMIC == 0) {
+ return(0);
+ }
+ if( cachedResult == 0 ) {
+# if defined(NETBSD) && defined(RTLD_DI_LINKMAP)
+ struct link_map *lm = NULL;
+ if (!dlinfo(RTLD_SELF, RTLD_DI_LINKMAP, &lm))
+ cachedResult = lm;
+# else
+ int tag;
+ for( dp = _DYNAMIC; (tag = dp->d_tag) != 0; dp++ ) {
+ if( tag == DT_DEBUG ) {
+ struct link_map *lm
+ = ((struct r_debug *)(dp->d_un.d_ptr))->r_map;
+ if( lm != 0 ) cachedResult = lm->l_next; /* might be NULL */
+ break;
+ }
+ }
+# endif /* !NETBSD || !RTLD_DI_LINKMAP */
+ }
+ return cachedResult;
+}
+
+GC_INNER void GC_register_dynamic_libraries(void)
+{
+ struct link_map *lm;
+
+# ifdef HAVE_DL_ITERATE_PHDR
+ if (GC_register_dynamic_libraries_dl_iterate_phdr()) {
+ return;
+ }
+# endif
+ for (lm = GC_FirstDLOpenedLinkMap(); lm != 0; lm = lm->l_next)
+ {
+ ElfW(Ehdr) * e;
+ ElfW(Phdr) * p;
+ unsigned long offset;
+ char * start;
+ int i;
+
+ e = (ElfW(Ehdr) *) lm->l_addr;
+# ifdef PLATFORM_ANDROID
+ if (e == NULL)
+ continue;
+# endif
+ p = ((ElfW(Phdr) *)(((char *)(e)) + e->e_phoff));
+ offset = ((unsigned long)(lm->l_addr));
+ for( i = 0; i < (int)e->e_phnum; i++, p++ ) {
+ switch( p->p_type ) {
+ case PT_LOAD:
+ {
+ if( !(p->p_flags & PF_W) ) break;
+ start = ((char *)(p->p_vaddr)) + offset;
+ GC_add_roots_inner(start, start + p->p_memsz, TRUE);
+ }
+ break;
+ default:
+ break;
+ }
+ }
+ }
+}
+
+#endif /* !USE_PROC_FOR_LIBRARIES */
+
+#endif /* LINUX */
+
+#if defined(IRIX5) || (defined(USE_PROC_FOR_LIBRARIES) && !defined(LINUX))
+
+#include <sys/procfs.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <elf.h>
+#include <errno.h>
+#include <signal.h> /* Only for the following test. */
+#ifndef _sigargs
+# define IRIX6
+#endif
+
+/* We use /proc to track down all parts of the address space that are */
+/* mapped by the process, and throw out regions we know we shouldn't */
+/* worry about. This may also work under other SVR4 variants. */
+GC_INNER void GC_register_dynamic_libraries(void)
+{
+ static int fd = -1;
+ char buf[30];
+ static prmap_t * addr_map = 0;
+ static int current_sz = 0; /* Number of records currently in addr_map */
+ static int needed_sz; /* Required size of addr_map */
+ int i;
+ long flags;
+ ptr_t start;
+ ptr_t limit;
+ ptr_t heap_start = HEAP_START;
+ ptr_t heap_end = heap_start;
+
+# ifdef SOLARISDL
+# define MA_PHYS 0
+# endif /* SOLARISDL */
+
+ if (fd < 0) {
+ sprintf(buf, "/proc/%ld", (long)getpid());
+ /* The above generates a lint complaint, since pid_t varies. */
+ /* It's unclear how to improve this. */
+ fd = open(buf, O_RDONLY);
+ if (fd < 0) {
+ ABORT("/proc open failed");
+ }
+ }
+ if (ioctl(fd, PIOCNMAP, &needed_sz) < 0) {
+ GC_err_printf("fd = %d, errno = %d\n", fd, errno);
+ ABORT("/proc PIOCNMAP ioctl failed");
+ }
+ if (needed_sz >= current_sz) {
+ current_sz = needed_sz * 2 + 1;
+ /* Expansion, plus room for 0 record */
+ addr_map = (prmap_t *)GC_scratch_alloc(
+ (word)current_sz * sizeof(prmap_t));
+ if (addr_map == NULL)
+ ABORT("Insufficient memory for address map");
+ }
+ if (ioctl(fd, PIOCMAP, addr_map) < 0) {
+ GC_err_printf("fd = %d, errno = %d, needed_sz = %d, addr_map = %p\n",
+ fd, errno, needed_sz, addr_map);
+ ABORT("/proc PIOCMAP ioctl failed");
+ };
+ if (GC_n_heap_sects > 0) {
+ heap_end = GC_heap_sects[GC_n_heap_sects-1].hs_start
+ + GC_heap_sects[GC_n_heap_sects-1].hs_bytes;
+ if (heap_end < GC_scratch_last_end_ptr) heap_end = GC_scratch_last_end_ptr;
+ }
+ for (i = 0; i < needed_sz; i++) {
+ flags = addr_map[i].pr_mflags;
+ if ((flags & (MA_BREAK | MA_STACK | MA_PHYS
+ | MA_FETCHOP | MA_NOTCACHED)) != 0) goto irrelevant;
+ if ((flags & (MA_READ | MA_WRITE)) != (MA_READ | MA_WRITE))
+ goto irrelevant;
+ /* The latter test is empirically useless in very old Irix */
+ /* versions. Other than the */
+ /* main data and stack segments, everything appears to be */
+ /* mapped readable, writable, executable, and shared(!!). */
+ /* This makes no sense to me. - HB */
+ start = (ptr_t)(addr_map[i].pr_vaddr);
+ if (GC_roots_present(start)) goto irrelevant;
+ if (start < heap_end && start >= heap_start)
+ goto irrelevant;
+# ifdef MMAP_STACKS
+ if (GC_is_thread_stack(start)) goto irrelevant;
+# endif /* MMAP_STACKS */
+
+ limit = start + addr_map[i].pr_size;
+ /* The following seemed to be necessary for very old versions */
+ /* of Irix, but it has been reported to discard relevant */
+ /* segments under Irix 6.5. */
+# ifndef IRIX6
+ if (addr_map[i].pr_off == 0 && strncmp(start, ELFMAG, 4) == 0) {
+ /* Discard text segments, i.e. 0-offset mappings against */
+ /* executable files which appear to have ELF headers. */
+ caddr_t arg;
+ int obj;
+# define MAP_IRR_SZ 10
+ static ptr_t map_irr[MAP_IRR_SZ];
+ /* Known irrelevant map entries */
+ static int n_irr = 0;
+ struct stat buf;
+ register int j;
+
+ for (j = 0; j < n_irr; j++) {
+ if (map_irr[j] == start) goto irrelevant;
+ }
+ arg = (caddr_t)start;
+ obj = ioctl(fd, PIOCOPENM, &arg);
+ if (obj >= 0) {
+ fstat(obj, &buf);
+ close(obj);
+ if ((buf.st_mode & 0111) != 0) {
+ if (n_irr < MAP_IRR_SZ) {
+ map_irr[n_irr++] = start;
+ }
+ goto irrelevant;
+ }
+ }
+ }
+# endif /* !IRIX6 */
+ GC_add_roots_inner(start, limit, TRUE);
+ irrelevant: ;
+ }
+ /* Don't keep cached descriptor, for now. Some kernels don't like us */
+ /* to keep a /proc file descriptor around during kill -9. */
+ if (close(fd) < 0) ABORT("Couldn't close /proc file");
+ fd = -1;
+}
+
+# endif /* USE_PROC || IRIX5 */
+
+# if defined(MSWIN32) || defined(MSWINCE) || defined(CYGWIN32)
+
+# ifndef WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN 1
+# endif
+# define NOSERVICE
+# include <windows.h>
+# include <stdlib.h>
+
+ /* We traverse the entire address space and register all segments */
+ /* that could possibly have been written to. */
+ STATIC void GC_cond_add_roots(char *base, char * limit)
+ {
+# ifdef GC_WIN32_THREADS
+ char * curr_base = base;
+ char * next_stack_lo;
+ char * next_stack_hi;
+
+ if (base == limit) return;
+ for(;;) {
+ GC_get_next_stack(curr_base, limit, &next_stack_lo, &next_stack_hi);
+ if (next_stack_lo >= limit) break;
+ if (next_stack_lo > curr_base)
+ GC_add_roots_inner(curr_base, next_stack_lo, TRUE);
+ curr_base = next_stack_hi;
+ }
+ if (curr_base < limit) GC_add_roots_inner(curr_base, limit, TRUE);
+# else
+ char * stack_top
+ = (char *)((word)GC_approx_sp() &
+ ~(GC_sysinfo.dwAllocationGranularity - 1));
+ if (base == limit) return;
+ if (limit > stack_top && base < GC_stackbottom) {
+ /* Part of the stack; ignore it. */
+ return;
+ }
+ GC_add_roots_inner(base, limit, TRUE);
+# endif
+ }
+
+#ifdef DYNAMIC_LOADING
+ /* GC_register_main_static_data is not needed unless DYNAMIC_LOADING. */
+ GC_INNER GC_bool GC_register_main_static_data(void)
+ {
+# if defined(MSWINCE) || defined(CYGWIN32)
+ /* Do we need to separately register the main static data segment? */
+ return FALSE;
+# else
+ return GC_no_win32_dlls;
+# endif
+ }
+# define HAVE_REGISTER_MAIN_STATIC_DATA
+#endif /* DYNAMIC_LOADING */
+
+# ifdef DEBUG_VIRTUALQUERY
+ void GC_dump_meminfo(MEMORY_BASIC_INFORMATION *buf)
+ {
+ GC_printf("BaseAddress = 0x%lx, AllocationBase = 0x%lx,"
+ " RegionSize = 0x%lx(%lu)\n", buf -> BaseAddress,
+ buf -> AllocationBase, buf -> RegionSize, buf -> RegionSize);
+ GC_printf("\tAllocationProtect = 0x%lx, State = 0x%lx, Protect = 0x%lx, "
+ "Type = 0x%lx\n", buf -> AllocationProtect, buf -> State,
+ buf -> Protect, buf -> Type);
+ }
+# endif /* DEBUG_VIRTUALQUERY */
+
+# if defined(MSWINCE) || defined(CYGWIN32)
+ /* FIXME: Should we really need to scan MEM_PRIVATE sections? */
+ /* For now, we don't add MEM_PRIVATE sections to the data roots for */
+ /* WinCE because otherwise SEGV fault sometimes happens to occur in */
+ /* GC_mark_from() (and, even if we use WRAP_MARK_SOME, WinCE prints */
+ /* a "Data Abort" message to the debugging console). */
+ /* To workaround that, use -DGC_REGISTER_MEM_PRIVATE. */
+# define GC_wnt TRUE
+# endif
+
+ GC_INNER void GC_register_dynamic_libraries(void)
+ {
+ MEMORY_BASIC_INFORMATION buf;
+ size_t result;
+ DWORD protect;
+ LPVOID p;
+ char * base;
+ char * limit, * new_limit;
+
+# ifdef MSWIN32
+ if (GC_no_win32_dlls) return;
+# endif
+ base = limit = p = GC_sysinfo.lpMinimumApplicationAddress;
+ while (p < GC_sysinfo.lpMaximumApplicationAddress) {
+ result = VirtualQuery(p, &buf, sizeof(buf));
+# ifdef MSWINCE
+ if (result == 0) {
+ /* Page is free; advance to the next possible allocation base */
+ new_limit = (char *)
+ (((DWORD) p + GC_sysinfo.dwAllocationGranularity)
+ & ~(GC_sysinfo.dwAllocationGranularity-1));
+ } else
+# endif
+ /* else */ {
+ if (result != sizeof(buf)) {
+ ABORT("Weird VirtualQuery result");
+ }
+ new_limit = (char *)p + buf.RegionSize;
+ protect = buf.Protect;
+ if (buf.State == MEM_COMMIT
+ && (protect == PAGE_EXECUTE_READWRITE
+ || protect == PAGE_READWRITE)
+ && (buf.Type == MEM_IMAGE
+# ifdef GC_REGISTER_MEM_PRIVATE
+ || (protect == PAGE_READWRITE && buf.Type == MEM_PRIVATE)
+# else
+ /* There is some evidence that we cannot always */
+ /* ignore MEM_PRIVATE sections under Windows ME */
+ /* and predecessors. Hence we now also check for */
+ /* that case. */
+ || (!GC_wnt && buf.Type == MEM_PRIVATE)
+# endif
+ )
+ && !GC_is_heap_base(buf.AllocationBase)) {
+# ifdef DEBUG_VIRTUALQUERY
+ GC_dump_meminfo(&buf);
+# endif
+ if ((char *)p != limit) {
+ GC_cond_add_roots(base, limit);
+ base = p;
+ }
+ limit = new_limit;
+ }
+ }
+ if (p > (LPVOID)new_limit /* overflow */) break;
+ p = (LPVOID)new_limit;
+ }
+ GC_cond_add_roots(base, limit);
+ }
+
+#endif /* MSWIN32 || MSWINCE || CYGWIN32 */
+
+#if defined(ALPHA) && defined(OSF1)
+
+#include <loader.h>
+
+extern char *sys_errlist[];
+extern int sys_nerr;
+extern int errno;
+
+GC_INNER void GC_register_dynamic_libraries(void)
+{
+ int status;
+ ldr_process_t mypid;
+
+ /* module */
+ ldr_module_t moduleid = LDR_NULL_MODULE;
+ ldr_module_info_t moduleinfo;
+ size_t moduleinfosize = sizeof(moduleinfo);
+ size_t modulereturnsize;
+
+ /* region */
+ ldr_region_t region;
+ ldr_region_info_t regioninfo;
+ size_t regioninfosize = sizeof(regioninfo);
+ size_t regionreturnsize;
+
+ /* Obtain id of this process */
+ mypid = ldr_my_process();
+
+ /* For each module */
+ while (TRUE) {
+
+ /* Get the next (first) module */
+ status = ldr_next_module(mypid, &moduleid);
+
+ /* Any more modules? */
+ if (moduleid == LDR_NULL_MODULE)
+ break; /* No more modules */
+
+ /* Check status AFTER checking moduleid because */
+ /* of a bug in the non-shared ldr_next_module stub */
+ if (status != 0) {
+ if (GC_print_stats) {
+ GC_log_printf("dynamic_load: status = %d\n", status);
+ if (errno < sys_nerr) {
+ GC_log_printf("dynamic_load: %s\n", sys_errlist[errno]);
+ } else {
+ GC_log_printf("dynamic_load: err_code = %d\n", errno);
+ }
+ }
+ ABORT("ldr_next_module failed");
+ }
+
+ /* Get the module information */
+ status = ldr_inq_module(mypid, moduleid, &moduleinfo,
+ moduleinfosize, &modulereturnsize);
+ if (status != 0 )
+ ABORT("ldr_inq_module failed");
+
+ /* is module for the main program (i.e. nonshared portion)? */
+ if (moduleinfo.lmi_flags & LDR_MAIN)
+ continue; /* skip the main module */
+
+# ifdef DL_VERBOSE
+ GC_log_printf("---Module---\n");
+ GC_log_printf("Module ID\t = %16ld\n", moduleinfo.lmi_modid);
+ GC_log_printf("Count of regions = %16d\n", moduleinfo.lmi_nregion);
+ GC_log_printf("flags for module = %16lx\n", moduleinfo.lmi_flags);
+ GC_log_printf("module pathname\t = \"%s\"\n", moduleinfo.lmi_name);
+# endif
+
+ /* For each region in this module */
+ for (region = 0; region < moduleinfo.lmi_nregion; region++) {
+ /* Get the region information */
+ status = ldr_inq_region(mypid, moduleid, region, ®ioninfo,
+ regioninfosize, ®ionreturnsize);
+ if (status != 0 )
+ ABORT("ldr_inq_region failed");
+
+ /* only process writable (data) regions */
+ if (! (regioninfo.lri_prot & LDR_W))
+ continue;
+
+# ifdef DL_VERBOSE
+ GC_log_printf("--- Region ---\n");
+ GC_log_printf("Region number\t = %16ld\n",
+ regioninfo.lri_region_no);
+ GC_log_printf("Protection flags = %016x\n", regioninfo.lri_prot);
+ GC_log_printf("Virtual address\t = %16p\n", regioninfo.lri_vaddr);
+ GC_log_printf("Mapped address\t = %16p\n",
+ regioninfo.lri_mapaddr);
+ GC_log_printf("Region size\t = %16ld\n", regioninfo.lri_size);
+ GC_log_printf("Region name\t = \"%s\"\n", regioninfo.lri_name);
+# endif
+
+ /* register region as a garbage collection root */
+ GC_add_roots_inner((char *)regioninfo.lri_mapaddr,
+ (char *)regioninfo.lri_mapaddr + regioninfo.lri_size,
+ TRUE);
+
+ }
+ }
+}
+#endif
+
+#if defined(HPUX)
+
+#include <errno.h>
+#include <dl.h>
+
+extern char *sys_errlist[];
+extern int sys_nerr;
+
+GC_INNER void GC_register_dynamic_libraries(void)
+{
+ int status;
+ int index = 1; /* Ordinal position in shared library search list */
+ struct shl_descriptor *shl_desc; /* Shared library info, see dl.h */
+
+ /* For each dynamic library loaded */
+ while (TRUE) {
+
+ /* Get info about next shared library */
+ status = shl_get(index, &shl_desc);
+
+ /* Check if this is the end of the list or if some error occured */
+ if (status != 0) {
+# ifdef GC_HPUX_THREADS
+ /* I've seen errno values of 0. The man page is not clear */
+ /* as to whether errno should get set on a -1 return. */
+ break;
+# else
+ if (errno == EINVAL) {
+ break; /* Moved past end of shared library list --> finished */
+ } else {
+ if (GC_print_stats) {
+ if (errno < sys_nerr) {
+ GC_log_printf("dynamic_load: %s\n", sys_errlist[errno]);
+ } else {
+ GC_log_printf("dynamic_load: err_code = %d\n", errno);
+ }
+ }
+ ABORT("shl_get failed");
+ }
+# endif
+ }
+
+# ifdef DL_VERBOSE
+ GC_log_printf("---Shared library---\n");
+ GC_log_printf("\tfilename\t= \"%s\"\n", shl_desc->filename);
+ GC_log_printf("\tindex\t\t= %d\n", index);
+ GC_log_printf("\thandle\t\t= %08x\n",
+ (unsigned long) shl_desc->handle);
+ GC_log_printf("\ttext seg.start\t= %08x\n", shl_desc->tstart);
+ GC_log_printf("\ttext seg.end\t= %08x\n", shl_desc->tend);
+ GC_log_printf("\tdata seg.start\t= %08x\n", shl_desc->dstart);
+ GC_log_printf("\tdata seg.end\t= %08x\n", shl_desc->dend);
+ GC_log_printf("\tref.count\t= %lu\n", shl_desc->ref_count);
+# endif
+
+ /* register shared library's data segment as a garbage collection root */
+ GC_add_roots_inner((char *) shl_desc->dstart,
+ (char *) shl_desc->dend, TRUE);
+
+ index++;
+ }
+}
+#endif /* HPUX */
+
+#ifdef AIX
+# pragma alloca
+# include <sys/ldr.h>
+# include <sys/errno.h>
+ GC_INNER void GC_register_dynamic_libraries(void)
+ {
+ int len;
+ char *ldibuf;
+ int ldibuflen;
+ struct ld_info *ldi;
+
+ ldibuf = alloca(ldibuflen = 8192);
+
+ while ( (len = loadquery(L_GETINFO,ldibuf,ldibuflen)) < 0) {
+ if (errno != ENOMEM) {
+ ABORT("loadquery failed");
+ }
+ ldibuf = alloca(ldibuflen *= 2);
+ }
+
+ ldi = (struct ld_info *)ldibuf;
+ while (ldi) {
+ len = ldi->ldinfo_next;
+ GC_add_roots_inner(
+ ldi->ldinfo_dataorg,
+ (ptr_t)(unsigned long)ldi->ldinfo_dataorg
+ + ldi->ldinfo_datasize,
+ TRUE);
+ ldi = len ? (struct ld_info *)((char *)ldi + len) : 0;
+ }
+ }
+#endif /* AIX */
+
+#ifdef DARWIN
+
+/* __private_extern__ hack required for pre-3.4 gcc versions. */
+#ifndef __private_extern__
+# define __private_extern__ extern
+# include <mach-o/dyld.h>
+# undef __private_extern__
+#else
+# include <mach-o/dyld.h>
+#endif
+#include <mach-o/getsect.h>
+
+/*#define DARWIN_DEBUG*/
+
+/* Writable sections generally available on Darwin. */
+STATIC const struct {
+ const char *seg;
+ const char *sect;
+} GC_dyld_sections[] = {
+ { SEG_DATA, SECT_DATA },
+ /* Used by FSF GCC, but not by OS X system tools, so far. */
+ { SEG_DATA, "__static_data" },
+ { SEG_DATA, SECT_BSS },
+ { SEG_DATA, SECT_COMMON },
+ /* FSF GCC - zero-sized object sections for targets */
+ /*supporting section anchors. */
+ { SEG_DATA, "__zobj_data" },
+ { SEG_DATA, "__zobj_bss" }
+};
+
+/* Additional writable sections: */
+/* GCC on Darwin constructs aligned sections "on demand", where */
+/* the alignment size is embedded in the section name. */
+/* Furthermore, there are distinctions between sections */
+/* containing private vs. public symbols. It also constructs */
+/* sections specifically for zero-sized objects, when the */
+/* target supports section anchors. */
+STATIC const char * GC_dyld_add_sect_fmts[] =
+{
+ "__bss%u",
+ "__pu_bss%u",
+ "__zo_bss%u",
+ "__zo_pu_bss%u",
+ NULL
+};
+
+/* Currently, mach-o will allow up to the max of 2^15 alignment */
+/* in an object file. */
+#ifndef L2_MAX_OFILE_ALIGNMENT
+# define L2_MAX_OFILE_ALIGNMENT 15
+#endif
+
+STATIC const char *GC_dyld_name_for_hdr(const struct GC_MACH_HEADER *hdr)
+{
+ unsigned long i, c;
+ c = _dyld_image_count();
+ for (i = 0; i < c; i++)
+ if ((const struct GC_MACH_HEADER *)_dyld_get_image_header(i) == hdr)
+ return _dyld_get_image_name(i);
+ return NULL;
+}
+
+/* This should never be called by a thread holding the lock. */
+STATIC void GC_dyld_image_add(const struct GC_MACH_HEADER *hdr,
+ intptr_t slide)
+{
+ unsigned long start, end;
+ unsigned i, j;
+ const struct GC_MACH_SECTION *sec;
+ const char *name;
+ GC_has_static_roots_func callback = GC_has_static_roots;
+ char secnam[16];
+ const char *fmt;
+ DCL_LOCK_STATE;
+
+ if (GC_no_dls) return;
+# ifdef DARWIN_DEBUG
+ name = GC_dyld_name_for_hdr(hdr);
+# else
+ name = callback != 0 ? GC_dyld_name_for_hdr(hdr) : NULL;
+# endif
+ for (i = 0; i < sizeof(GC_dyld_sections)/sizeof(GC_dyld_sections[0]); i++) {
+ sec = GC_GETSECTBYNAME(hdr, GC_dyld_sections[i].seg,
+ GC_dyld_sections[i].sect);
+ if (sec == NULL || sec->size < sizeof(word))
+ continue;
+ start = slide + sec->addr;
+ end = start + sec->size;
+ LOCK();
+ /* The user callback is called holding the lock. */
+ if (callback == 0 || callback(name, (void*)start, (size_t)sec->size)) {
+# ifdef DARWIN_DEBUG
+ GC_log_printf(
+ "Adding section __DATA,%s at %p-%p (%lu bytes) from image %s\n",
+ GC_dyld_sections[i].sect, (void*)start, (void*)end,
+ (unsigned long)sec->size, name);
+# endif
+ GC_add_roots_inner((ptr_t)start, (ptr_t)end, FALSE);
+ }
+ UNLOCK();
+ }
+
+ /* Sections constructed on demand. */
+ for (j = 0; (fmt = GC_dyld_add_sect_fmts[j]) != NULL; j++) {
+ /* Add our manufactured aligned BSS sections. */
+ for (i = 0; i <= L2_MAX_OFILE_ALIGNMENT; i++) {
+ snprintf(secnam, sizeof(secnam), fmt, (unsigned)i);
+ sec = GC_GETSECTBYNAME(hdr, SEG_DATA, secnam);
+ if (sec == NULL || sec->size == 0)
+ continue;
+ start = slide + sec->addr;
+ end = start + sec->size;
+# ifdef DARWIN_DEBUG
+ GC_log_printf("Adding on-demand section __DATA,%s at"
+ " %p-%p (%lu bytes) from image %s\n",
+ secnam, (void*)start, (void*)end,
+ (unsigned long)sec->size, name);
+# endif
+ GC_add_roots((char*)start, (char*)end);
+ }
+ }
+
+# ifdef DARWIN_DEBUG
+ GC_print_static_roots();
+# endif
+}
+
+/* This should never be called by a thread holding the lock. */
+STATIC void GC_dyld_image_remove(const struct GC_MACH_HEADER *hdr,
+ intptr_t slide)
+{
+ unsigned long start, end;
+ unsigned i, j;
+ const struct GC_MACH_SECTION *sec;
+ char secnam[16];
+ const char *fmt;
+
+ for (i = 0; i < sizeof(GC_dyld_sections)/sizeof(GC_dyld_sections[0]); i++) {
+ sec = GC_GETSECTBYNAME(hdr, GC_dyld_sections[i].seg,
+ GC_dyld_sections[i].sect);
+ if (sec == NULL || sec->size == 0)
+ continue;
+ start = slide + sec->addr;
+ end = start + sec->size;
+# ifdef DARWIN_DEBUG
+ GC_log_printf(
+ "Removing section __DATA,%s at %p-%p (%lu bytes) from image %s\n",
+ GC_dyld_sections[i].sect, (void*)start, (void*)end,
+ (unsigned long)sec->size, GC_dyld_name_for_hdr(hdr));
+# endif
+ GC_remove_roots((char*)start, (char*)end);
+ }
+
+ /* Remove our on-demand sections. */
+ for (j = 0; (fmt = GC_dyld_add_sect_fmts[j]) != NULL; j++) {
+ for (i = 0; i <= L2_MAX_OFILE_ALIGNMENT; i++) {
+ snprintf(secnam, sizeof(secnam), fmt, (unsigned)i);
+ sec = GC_GETSECTBYNAME(hdr, SEG_DATA, secnam);
+ if (sec == NULL || sec->size == 0)
+ continue;
+ start = slide + sec->addr;
+ end = start + sec->size;
+# ifdef DARWIN_DEBUG
+ GC_log_printf("Removing on-demand section __DATA,%s at"
+ " %p-%p (%lu bytes) from image %s\n", secnam,
+ (void*)start, (void*)end, (unsigned long)sec->size,
+ GC_dyld_name_for_hdr(hdr));
+# endif
+ GC_remove_roots((char*)start, (char*)end);
+ }
+ }
+
+# ifdef DARWIN_DEBUG
+ GC_print_static_roots();
+# endif
+}
+
+GC_INNER void GC_register_dynamic_libraries(void)
+{
+ /* Currently does nothing. The callbacks are setup by GC_init_dyld()
+ The dyld library takes it from there. */
+}
+
+/* The _dyld_* functions have an internal lock so no _dyld functions
+ can be called while the world is stopped without the risk of a deadlock.
+ Because of this we MUST setup callbacks BEFORE we ever stop the world.
+ This should be called BEFORE any thread in created and WITHOUT the
+ allocation lock held. */
+
+GC_INNER void GC_init_dyld(void)
+{
+ static GC_bool initialized = FALSE;
+
+ if (initialized) return;
+
+# ifdef DARWIN_DEBUG
+ GC_log_printf("Registering dyld callbacks...\n");
+# endif
+
+ /* Apple's Documentation:
+ When you call _dyld_register_func_for_add_image, the dynamic linker
+ runtime calls the specified callback (func) once for each of the images
+ that is currently loaded into the program. When a new image is added to
+ the program, your callback is called again with the mach_header for the
+ new image, and the virtual memory slide amount of the new image.
+
+ This WILL properly register already linked libraries and libraries
+ linked in the future.
+ */
+
+ _dyld_register_func_for_add_image(GC_dyld_image_add);
+ _dyld_register_func_for_remove_image(GC_dyld_image_remove);
+ /* Ignore 2 compiler warnings here: passing argument 1 of */
+ /* '_dyld_register_func_for_add/remove_image' from incompatible */
+ /* pointer type. */
+
+ /* Set this early to avoid reentrancy issues. */
+ initialized = TRUE;
+
+# ifdef NO_DYLD_BIND_FULLY_IMAGE
+ /* FIXME: What should we do in this case? */
+# else
+ if (GC_no_dls) return; /* skip main data segment registration */
+
+ /* When the environment variable is set, the dynamic linker binds */
+ /* all undefined symbols the application needs at launch time. */
+ /* This includes function symbols that are normally bound lazily at */
+ /* the time of their first invocation. */
+ if (GETENV("DYLD_BIND_AT_LAUNCH") == 0) {
+ /* The environment variable is unset, so we should bind manually. */
+# ifdef DARWIN_DEBUG
+ GC_log_printf("Forcing full bind of GC code...\n");
+# endif
+ /* FIXME: '_dyld_bind_fully_image_containing_address' is deprecated. */
+ if (!_dyld_bind_fully_image_containing_address(
+ (unsigned long *)GC_malloc))
+ ABORT("_dyld_bind_fully_image_containing_address failed");
+ }
+# endif
+}
+
+#define HAVE_REGISTER_MAIN_STATIC_DATA
+GC_INNER GC_bool GC_register_main_static_data(void)
+{
+ /* Already done through dyld callbacks */
+ return FALSE;
+}
+
+#endif /* DARWIN */
+
+#elif defined(PCR)
+
+# include "il/PCR_IL.h"
+# include "th/PCR_ThCtl.h"
+# include "mm/PCR_MM.h"
+
+ GC_INNER void GC_register_dynamic_libraries(void)
+ {
+ /* Add new static data areas of dynamically loaded modules. */
+ PCR_IL_LoadedFile * p = PCR_IL_GetLastLoadedFile();
+ PCR_IL_LoadedSegment * q;
+
+ /* Skip uncommitted files */
+ while (p != NIL && !(p -> lf_commitPoint)) {
+ /* The loading of this file has not yet been committed */
+ /* Hence its description could be inconsistent. */
+ /* Furthermore, it hasn't yet been run. Hence its data */
+ /* segments can't possibly reference heap allocated */
+ /* objects. */
+ p = p -> lf_prev;
+ }
+ for (; p != NIL; p = p -> lf_prev) {
+ for (q = p -> lf_ls; q != NIL; q = q -> ls_next) {
+ if ((q -> ls_flags & PCR_IL_SegFlags_Traced_MASK)
+ == PCR_IL_SegFlags_Traced_on) {
+ GC_add_roots_inner((char *)(q -> ls_addr),
+ (char *)(q -> ls_addr) + q -> ls_bytes, TRUE);
+ }
+ }
+ }
+ }
+#endif /* PCR && !DYNAMIC_LOADING && !MSWIN32 */
+
+#if !defined(HAVE_REGISTER_MAIN_STATIC_DATA) && defined(DYNAMIC_LOADING)
+ /* Do we need to separately register the main static data segment? */
+ GC_INNER GC_bool GC_register_main_static_data(void)
+ {
+ return TRUE;
+ }
+#endif /* HAVE_REGISTER_MAIN_STATIC_DATA */
+
+/* Register a routine to filter dynamic library registration. */
+GC_API void GC_CALL GC_register_has_static_roots_callback(
+ GC_has_static_roots_func callback)
+{
+ GC_has_static_roots = callback;
+}
projects / hs-boehmgc.git / blobdiff