Upstream android debug and log related files

base/debug/debugger_posix.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/debug/debugger.h"
 #include "build/build_config.h"
 
 #include <errno.h>
 #include <execinfo.h>
 #include <fcntl.h>
@@ skipping 26 matching lines @@
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/safe_strerror_posix.h"
 #include "base/string_piece.h"
 #include "base/stringprintf.h"
 
 #if defined(USE_SYMBOLIZE)
 #include "base/third_party/symbolize/symbolize.h"
 #endif
 
+#if defined(OS_ANDROID)
+#include <execinfo.h>
+#include "base/threading/platform_thread.h"
+#endif
+
 namespace base {
 namespace debug {
 
 bool SpawnDebuggerOnProcess(unsigned /* process_id */) {
   NOTIMPLEMENTED();
   return false;
 }
 
 #if defined(OS_MACOSX)
 
@@ skipping 30 matching lines @@
     being_debugged = false;
     return being_debugged;
   }
 
   // This process is being debugged if the P_TRACED flag is set.
   is_set = true;
   being_debugged = (info.kp_proc.p_flag & P_TRACED) != 0;
   return being_debugged;
 }
 
-#elif defined(OS_LINUX)
+#elif defined(OS_LINUX) || defined(OS_ANDROID)
 
 // We can look in /proc/self/status for TracerPid.  We are likely used in crash
 // handling, so we are careful not to use the heap or have side effects.
 // Another option that is common is to try to ptrace yourself, but then we
 // can't detach without forking(), and that's not so great.
 // static
 bool BeingDebugged() {
   int status_fd = open("/proc/self/status", O_RDONLY);
   if (status_fd == -1)
     return false;
@@ skipping 46 matching lines @@
 // | OS    | Dump on SIGTRAP | Dump on SIGABRT |
 // +-------+-----------------+-----------------+
 // | Linux |       N         |        Y        |
 // | Mac   |       Y         |        N        |
 // +-------+-----------------+-----------------+
 //
 // Thus we do the following:
 // Linux: Debug mode, send SIGTRAP; Release mode, send SIGABRT.
 // Mac: Always send SIGTRAP.
 
-#if defined(NDEBUG) && !defined(OS_MACOSX)
+#if defined(NDEBUG) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
 #define DEBUG_BREAK() abort()
 #elif defined(OS_NACL)
 // The NaCl verifier doesn't let use use int3.  For now, we call abort().  We
 // should ask for advice from some NaCl experts about the optimum thing here.
 // http://code.google.com/p/nativeclient/issues/detail?id=645
 #define DEBUG_BREAK() abort()
 #elif defined(ARCH_CPU_ARM_FAMILY)
+#if defined(OS_ANDROID)
+// Though Android has a "helpful" process called debuggerd to catch native
+// signals on the general assumption that they are fatal errors, we've had great
+// difficulty continuing in a debugger once we stop from SIGINT triggered by
+// native code.
+//
+// Use GDB to set |go| to 1 to resume execution.
+#define DEBUG_BREAK() do { \
+  volatile int go = 0;             \
+  while (!go) { base::PlatformThread::Sleep(100); }   \
+} while (0)
+#else
+// ARM && !ANDROID
 #define DEBUG_BREAK() asm("bkpt 0")
+#endif
 #else
 #define DEBUG_BREAK() asm("int3")
 #endif
 
 void BreakDebugger() {
   DEBUG_BREAK();
 #if defined(NDEBUG)
   _exit(1);
 #endif
 }
 
 }  // namespace debug
 }  // namespace base