Common implementation of OS::DumpBacktrace() and OS::StackWalk().

src/platform-macos.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 35 matching lines @@
 #include <mach/task.h>
 #include <mach/vm_statistics.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sys/types.h>
 #include <sys/sysctl.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#include <cxxabi.h>
 
 #undef MAP_TYPE
 
 #include "v8.h"
 
 #include "platform-posix.h"
 #include "platform.h"
 #include "simulator.h"
 #include "vm-state-inl.h"
 
@@ skipping 116 matching lines @@
   abort();
 }
 
 
 void OS::DebugBreak() {
   asm("int $3");
 }
 
 
 void OS::DumpBacktrace() {
-  // Currently unsupported.
+  // If weak link to execinfo lib has failed, ie because we are on 10.4, abort.
+  if (backtrace == NULL) return;

[Dmitry Lomov (no reviews), 2013/07/12 07:46:02]

This code looks a copy of the code in platform-linux.cc
Can we share it, possibly parameterized with function pointer to backtrace
function?

[Benedikt Meurer, 2013/07/12 07:54:28]

It's basically a copy, yes. Where would we put this template? In
platform-posix.h?

+  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) {  // NOLINT
+        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);
 }
 
 
 class PosixMemoryMappedFile : public OS::MemoryMappedFile {
  public:
   PosixMemoryMappedFile(FILE* file, void* memory, int size)
     : file_(file), memory_(memory), size_(size) { }
   virtual ~PosixMemoryMappedFile();
   virtual void* memory() { return memory_; }
   virtual int size() { return size_; }
@@ skipping 503 matching lines @@
   limit_mutex = CreateMutex();
 }
 
 
 void OS::TearDown() {
   delete limit_mutex;
 }
 
 
 } }  // namespace v8::internal