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Merge "Make the dlfcn mutex static."

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Elliott Hughes 2012-10-12 10:59:59 -07:00 committed by Gerrit Code Review
commit 9434e8febc
2 changed files with 31 additions and 28 deletions
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11
libdl/libdl.c
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@ -24,13 +24,16 @@ void *dlsym(void *handle, const char *symbol) { return 0; }
int dladdr(const void *addr, Dl_info *info) { return 0; }
int dlclose(void *handle) { return 0; }
#ifdef __arm__
#if defined(__arm__)
void *dl_unwind_find_exidx(void *pc, int *pcount) { return 0; }
#elif defined(__i386__) || defined(__sh__) || defined(__mips__)
#elif defined(__i386__) || defined(__mips__)
/* we munge the cb definition so we don't have to include any headers here.
* It won't affect anything since these are just symbols anyway */
int dl_iterate_phdr(int (*cb)(void *info, void *size, void *data),
void *data) { return 0; }
int dl_iterate_phdr(int (*cb)(void *info, void *size, void *data), void *data) { return 0; }
#else
#error Unsupported architecture. Only mips, arm and x86 are supported.
#endif

48
linker/dlfcn.cpp
View file

@ -31,7 +31,7 @@ static const char* dl_err_str;
#define likely(expr) __builtin_expect (expr, 1)
#define unlikely(expr) __builtin_expect (expr, 0)
pthread_mutex_t dl_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER;
static pthread_mutex_t gDlMutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER;
static void set_dlerror(const char* msg, const char* detail) {
if (detail != NULL) {
@ -43,7 +43,7 @@ static void set_dlerror(const char* msg, const char* detail) {
}
void *dlopen(const char* filename, int flag) {
ScopedPthreadMutexLocker locker(&dl_lock);
ScopedPthreadMutexLocker locker(&gDlMutex);
soinfo* result = find_library(filename);
if (result == NULL) {
set_dlerror("dlopen failed", linker_get_error());
@ -61,7 +61,7 @@ const char* dlerror() {
}
void* dlsym(void* handle, const char* symbol) {
ScopedPthreadMutexLocker locker(&dl_lock);
ScopedPthreadMutexLocker locker(&gDlMutex);
if (unlikely(handle == 0)) {
set_dlerror("dlsym library handle is null", NULL);
@ -106,7 +106,7 @@ void* dlsym(void* handle, const char* symbol) {
}
int dladdr(const void* addr, Dl_info* info) {
ScopedPthreadMutexLocker locker(&dl_lock);
ScopedPthreadMutexLocker locker(&gDlMutex);
// Determine if this address can be found in any library currently mapped.
soinfo* si = find_containing_library(addr);
@ -131,7 +131,7 @@ int dladdr(const void* addr, Dl_info* info) {
}
int dlclose(void* handle) {
ScopedPthreadMutexLocker locker(&dl_lock);
ScopedPthreadMutexLocker locker(&gDlMutex);
return soinfo_unload((soinfo*) handle);
}
@ -177,28 +177,28 @@ static Elf32_Sym libdl_symtab[] = {
#endif
};
/* Fake out a hash table with a single bucket.
* A search of the hash table will look through
* libdl_symtab starting with index [1], then
* use libdl_chains to find the next index to
* look at. libdl_chains should be set up to
* walk through every element in libdl_symtab,
* and then end with 0 (sentinel value).
*
* I.e., libdl_chains should look like
* { 0, 2, 3, ... N, 0 } where N is the number
* of actual symbols, or nelems(libdl_symtab)-1
* (since the first element of libdl_symtab is not
* a real symbol).
*
* (see _elf_lookup())
*
* Note that adding any new symbols here requires
* stubbing them out in libdl.
*/
// Fake out a hash table with a single bucket.
// A search of the hash table will look through
// libdl_symtab starting with index [1], then
// use libdl_chains to find the next index to
// look at. libdl_chains should be set up to
// walk through every element in libdl_symtab,
// and then end with 0 (sentinel value).
//
// That is, libdl_chains should look like
// { 0, 2, 3, ... N, 0 } where N is the number
// of actual symbols, or nelems(libdl_symtab)-1
// (since the first element of libdl_symtab is not
// a real symbol).
//
// (see soinfo_elf_lookup())
//
// Note that adding any new symbols here requires
// stubbing them out in libdl.
static unsigned libdl_buckets[1] = { 1 };
static unsigned libdl_chains[7] = { 0, 2, 3, 4, 5, 6, 0 };
// This is used by the dynamic linker. Every process gets these symbols for free.
soinfo libdl_info = {
name: "libdl.so",