Rollback trunk to 3.21.15.

src/platform-openbsd.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 213 matching lines @@
     OS::Abort();
   }
   void* addr = mmap(NULL, size, PROT_READ | PROT_EXEC, MAP_PRIVATE,
                     fileno(f), 0);
   ASSERT(addr != MAP_FAILED);
   OS::Free(addr, size);
   fclose(f);
 }
 
 
+int OS::StackWalk(Vector<OS::StackFrame> frames) {
+  // backtrace is a glibc extension.
+  int frames_size = frames.length();
+  ScopedVector<void*> addresses(frames_size);
+
+  int frames_count = backtrace(addresses.start(), frames_size);
+
+  char** symbols = backtrace_symbols(addresses.start(), frames_count);
+  if (symbols == NULL) {
+    return kStackWalkError;
+  }
+
+  for (int i = 0; i < frames_count; i++) {
+    frames[i].address = addresses[i];
+    // Format a text representation of the frame based on the information
+    // available.
+    SNPrintF(MutableCStrVector(frames[i].text, kStackWalkMaxTextLen),
+             "%s",
+             symbols[i]);
+    // Make sure line termination is in place.
+    frames[i].text[kStackWalkMaxTextLen - 1] = '\0';
+  }
+
+  free(symbols);
+
+  return frames_count;
+}
+
 
 // Constants used for mmap.
 static const int kMmapFd = -1;
 static const int kMmapFdOffset = 0;
 
 
 VirtualMemory::VirtualMemory() : address_(NULL), size_(0) { }
 
 
 VirtualMemory::VirtualMemory(size_t size)
@@ skipping 118 matching lines @@
   return munmap(base, size) == 0;
 }
 
 
 bool VirtualMemory::HasLazyCommits() {
   // TODO(alph): implement for the platform.
   return false;
 }
 
 } }  // namespace v8::internal