add uclibc support

* some variables defined with "char *" should be modified to "const char*"
* For uclibc, glibc's "void malloc_stats(void)" should be "void malloc_stats(FILE *)", is commented now.
* For uclibc, __sbrk is with attribute "hidden", so we use mmap allocator for uclibc.

Makefile.am

@@ -662,7 +662,7 @@ if GCC
 malloc_extension_c_test_CFLAGS += -ansi
 endif GCC
 malloc_extension_c_test_LDFLAGS = $(PTHREAD_CFLAGS) $(TCMALLOC_FLAGS)
-malloc_extension_c_test_LDADD = $(LIBTCMALLOC_MINIMAL) $(PTHREAD_LIBS)
+malloc_extension_c_test_LDADD = $(LIBTCMALLOC_MINIMAL) $(PTHREAD_LIBS) -lstdc++
 endif !ENABLE_STATIC
 endif !MINGW
 

src/heap-checker.cc

@@ -1652,8 +1652,13 @@ ssize_t HeapLeakChecker::ObjectsLeaked() const {
 // Save pid of main thread for using in naming dump files
 static int32 main_thread_pid = getpid();
 #ifdef HAVE_PROGRAM_INVOCATION_NAME
+#ifdef __UCLIBC__
+extern const char* program_invocation_name;
+extern const char* program_invocation_short_name;
+#else
 extern char* program_invocation_name;
 extern char* program_invocation_short_name;
+#endif
 static const char* invocation_name() { return program_invocation_short_name; }
 static string invocation_path() { return program_invocation_name; }
 #else

src/heap-profiler.cc

@@ -541,7 +541,13 @@ extern "C" void HeapProfilerDump(const char *reason) {
 // number is defined in the environment variable HEAPPROFILESIGNAL.
 static void HeapProfilerDumpSignal(int signal_number) {
   (void)signal_number;
-  HeapProfilerDump("signal");
+  if (!heap_lock.TryLock()) {
+    return;
+  }
+  if (is_on && !dumping) {
+    DumpProfileLocked("signal");
+  }
+  heap_lock.Unlock();
 }
 
 

src/libc_override_gcc_and_weak.h

@@ -82,7 +82,9 @@ extern "C" {
   void* pvalloc(size_t size) __THROW              ALIAS(tc_pvalloc);
   int posix_memalign(void** r, size_t a, size_t s) __THROW
       ALIAS(tc_posix_memalign);
+#ifndef __UCLIBC__
   void malloc_stats(void) __THROW                 ALIAS(tc_malloc_stats);
+#endif
   int mallopt(int cmd, int value) __THROW         ALIAS(tc_mallopt);
 #ifdef HAVE_STRUCT_MALLINFO
   struct mallinfo mallinfo(void) __THROW          ALIAS(tc_mallinfo);

src/malloc_hook_mmap_linux.h

@@ -202,6 +202,7 @@ extern "C" void* mremap(void* old_addr, size_t old_size, size_t new_size,
   return result;
 }
 
+#ifndef __UCLIBC__
 // libc's version:
 extern "C" void* __sbrk(ptrdiff_t increment);
 
@@ -212,6 +213,8 @@ extern "C" void* sbrk(ptrdiff_t increment) __THROW {
   return result;
 }
 
+#endif
+
 /*static*/void* MallocHook::UnhookedMMap(void *start, size_t length, int prot,
                                          int flags, int fd, off_t offset) {
   void* result;

src/memory_region_map.cc

@@ -797,8 +797,6 @@ void MemoryRegionMap::MremapHook(const void* result,
   }
 }
 
-extern "C" void* __sbrk(ptrdiff_t increment);  // defined in libc
-
 void MemoryRegionMap::SbrkHook(const void* result, ptrdiff_t increment) {
   RAW_VLOG(10, "Sbrk = 0x%" PRIxPTR " of %" PRIdS "", (uintptr_t)result, increment);
   if (result != reinterpret_cast<void*>(-1)) {

src/symbolize.cc

@@ -76,9 +76,13 @@ static string* g_pprof_path = new string(FLAGS_symbolize_pprof);
 
 // Returns NULL if we're on an OS where we can't get the invocation name.
 // Using a static var is ok because we're not called from a thread.
-static char* GetProgramInvocationName() {
+static const char* GetProgramInvocationName() {
 #if defined(HAVE_PROGRAM_INVOCATION_NAME)
+#ifdef __UCLIBC__
+  extern const char* program_invocation_name; // uclibc provides this
+#else
   extern char* program_invocation_name;  // gcc provides this
+#endif
   return program_invocation_name;
 #elif defined(__MACH__)
   // We don't want to allocate memory for this since we may be

src/system-alloc.cc

@@ -202,8 +202,7 @@ static const char mmap_name[] = "MmapSysAllocator";
 
 void* SbrkSysAllocator::Alloc(size_t size, size_t *actual_size,
                               size_t alignment) {
-#ifndef HAVE_SBRK
-  failed_ = true;
+#if !defined(HAVE_SBRK) || defined(__UCLIBC__)
   return NULL;
 #else
   // Check if we should use sbrk allocation.
@@ -275,7 +274,6 @@ void* SbrkSysAllocator::Alloc(size_t size, size_t *actual_size,
 void* MmapSysAllocator::Alloc(size_t size, size_t *actual_size,
                               size_t alignment) {
 #ifndef HAVE_MMAP
-  failed_ = true;
   return NULL;
 #else
   // Check if we should use mmap allocation.
@@ -344,7 +342,6 @@ void* MmapSysAllocator::Alloc(size_t size, size_t *actual_size,
 void* DevMemSysAllocator::Alloc(size_t size, size_t *actual_size,
                                 size_t alignment) {
 #ifndef HAVE_MMAP
-  failed_ = true;
   return NULL;
 #else
   static bool initialized = false;