V8_Fatal now prints C++ stack trace in debug mode.

src/platform-linux.cc

Index: src/platform-linux.cc
diff --git a/src/platform-linux.cc b/src/platform-linux.cc
index 8022ba2d5af110ab24f155872736ed3d9a6b5f9d..d05dbb7c9181c8fecd6ea160eeef5a75a9b9f35e 100644
--- a/src/platform-linux.cc
+++ b/src/platform-linux.cc
@@ -38,6 +38,11 @@
 #include <sys/types.h>
 #include <stdlib.h>
 
+#if defined(__GLIBC__)
+#include <execinfo.h>
+#include <cxxabi.h>
+#endif
+
 // Ubuntu Dapper requires memory pages to be marked as
 // executable. Otherwise, OS raises an exception when executing code
 // in that page.
@@ -415,6 +420,37 @@ void OS::DebugBreak() {
 }
 
 
+void OS::DumpBacktrace() {
+#if defined(__GLIBC__)
+  void* trace[100];
+  int size = backtrace(trace, ARRAY_SIZE(trace));
+  char** symbols = backtrace_symbols(trace, size);
+  fprintf(stderr, "\n==== C stack trace ===============================\n\n");
+  if (size == 0) {
+    fprintf(stderr, "(empty)\n");
+  } else if (symbols == NULL) {
+    fprintf(stderr, "(no symbols)\n");
+  } else {
+    for (int i = 1; i < size; ++i) {
+      fprintf(stderr, "%2d: ", i);
+      char mangled[201];
+      if (sscanf(symbols[i], "%*[^(]%*[(]%200[^)+]", mangled) == 1) {
+        int status;
+        size_t length;
+        char* demangled = abi::__cxa_demangle(mangled, NULL, &length, &status);
+        fprintf(stderr, "%s\n", demangled ? demangled : mangled);
+        free(demangled);
+      } else {
+        fprintf(stderr, "??\n");
+      }
+    }
+  }
+  fflush(stderr);
+  free(symbols);
+#endif
+}
+
+
 class PosixMemoryMappedFile : public OS::MemoryMappedFile {
  public:
   PosixMemoryMappedFile(FILE* file, void* memory, int size)