commit 602b88ccddfafdefec023e7599d49c811ad3214f
author Christopher Ferris <cferris@google.com> Fri Aug 04 13:04:04 2017 -0700
committer Christopher Ferris <cferris@google.com> Tue Sep 05 15:57:00 2017 -0700
tree 11730f3f0cbc308860c4e45d6f0310c7f2083041
parent e0e2798f11ca082fe0a796f167f9006c51dc3304

Provide method to dump backtrace heap data.

For non-zygote spawned processes, we might want to dump the backtrace
data. Provide a method to send a signal to a process and then dump the
data to a file.

Adds a method to dump the backtrace data on exit.

Update documentation and explain format of heap dump data.

Test: Ran unit tests, enabled new options and used them.
Change-Id: Ie2fa706694160731afe02c1382b037d06df1d069

libc/malloc_debug/Config.h

diff --git a/libc/malloc_debug/Config.h b/libc/malloc_debug/Config.h
index d8a7069..349ad77 100644
--- a/libc/malloc_debug/Config.h
+++ b/libc/malloc_debug/Config.h
@@ -65,9 +65,12 @@
   uint64_t options() const { return options_; }
 
   int backtrace_signal() const { return backtrace_signal_; }
+  int backtrace_dump_signal() const { return backtrace_dump_signal_; }
   size_t backtrace_frames() const { return backtrace_frames_; }
   size_t backtrace_enabled() const { return backtrace_enabled_; }
   size_t backtrace_enable_on_signal() const { return backtrace_enable_on_signal_; }
+  bool backtrace_dump_on_exit() const { return backtrace_dump_on_exit_; }
+  const std::string& backtrace_dump_prefix() const { return backtrace_dump_prefix_; }
 
   size_t front_guard_bytes() const { return front_guard_bytes_; }
   size_t rear_guard_bytes() const { return rear_guard_bytes_; }
@@ -110,6 +113,8 @@
 
   bool SetBacktrace(const std::string& option, const std::string& value);
   bool SetBacktraceEnableOnSignal(const std::string& option, const std::string& value);
+  bool SetBacktraceDumpOnExit(const std::string& option, const std::string& value);
+  bool SetBacktraceDumpPrefix(const std::string& option, const std::string& value);
 
   bool SetExpandAlloc(const std::string& option, const std::string& value);
 
@@ -130,8 +135,11 @@
 
   bool backtrace_enable_on_signal_ = false;
   int backtrace_signal_ = 0;
+  int backtrace_dump_signal_ = 0;
   bool backtrace_enabled_ = false;
   size_t backtrace_frames_ = 0;
+  bool backtrace_dump_on_exit_ = false;
+  std::string backtrace_dump_prefix_;
 
   size_t fill_on_alloc_bytes_ = 0;
   size_t fill_on_free_bytes_ = 0;