Use libdl to get symbols for backtraces

src/base/logging.cc

Index: src/base/logging.cc
diff --git a/src/base/logging.cc b/src/base/logging.cc
index 25d77bb1ec1dc9b9e9e84e3ac2460eb689ac088f..a2688c9c9aefb1f566f048e79c7f6ec4c0f9db16 100644
--- a/src/base/logging.cc
+++ b/src/base/logging.cc
@@ -5,10 +5,11 @@
 #include "src/base/logging.h"
 
 #if V8_LIBC_GLIBC || V8_OS_BSD
-# include <cxxabi.h>
-# include <execinfo.h>
+#include <cxxabi.h>
+#include <dlfcn.h>
+#include <execinfo.h>
 #elif V8_OS_QNX
-# include <backtrace.h>
+#include <backtrace.h>
 #endif  // V8_LIBC_GLIBC || V8_OS_BSD
 
 #include <cstdio>
@@ -54,28 +55,24 @@ void DumpBacktrace() {
 #if V8_LIBC_GLIBC || V8_OS_BSD
   void* trace[100];
   int size = backtrace(trace, arraysize(trace));
-  char** symbols = backtrace_symbols(trace, size);
   OS::PrintError("\n==== C stack trace ===============================\n\n");
   if (size == 0) {
     OS::PrintError("(empty)\n");
-  } else if (symbols == NULL) {
-    OS::PrintError("(no symbols)\n");
   } else {
     for (int i = 1; i < size; ++i) {
       OS::PrintError("%2d: ", i);
-      char mangled[201];
-      if (sscanf(symbols[i], "%*[^(]%*[(]%200[^)+]", mangled) == 1) {  // NOLINT
-        int status;
-        size_t length;
-        char* demangled = abi::__cxa_demangle(mangled, NULL, &length, &status);
-        OS::PrintError("%s\n", demangled != NULL ? demangled : mangled);
+      Dl_info info;
+      char* demangled = NULL;
+      if (!dladdr(trace[i], &info) || !info.dli_sname) {
+        OS::PrintError("%p\n", trace[i]);
+      } else if ((demangled = abi::__cxa_demangle(info.dli_sname, 0, 0, 0))) {
+        OS::PrintError("%s\n", demangled);
         free(demangled);
       } else {
-        OS::PrintError("??\n");
+        OS::PrintError("%s\n", info.dli_sname);
       }
     }
   }
-  free(symbols);
 #elif V8_OS_QNX
   char out[1024];
   bt_accessor_t acc;