Upstream android debug and log related files

base/debug/debugger_posix.cc

Index: base/debug/debugger_posix.cc
diff --git a/base/debug/debugger_posix.cc b/base/debug/debugger_posix.cc
index bf90a0f552fb19e0401316c0dd622751284adbe4..ad8cb848e346c7b1d77b5e266a41b3f560ef7045 100644
--- a/base/debug/debugger_posix.cc
+++ b/base/debug/debugger_posix.cc
@@ -12,7 +12,7 @@
 #include <stdlib.h>
 #include <sys/param.h>
 #include <sys/stat.h>
-#if !defined(OS_NACL)
+#if !defined(OS_NACL) && !defined(OS_ANDROID)
 #include <sys/sysctl.h>
 #endif
 #include <sys/types.h>
@@ -43,6 +43,11 @@
 #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 {
 
@@ -93,7 +98,7 @@ bool BeingDebugged() {
   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.
@@ -160,7 +165,7 @@ bool BeingDebugged() {
 // 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
@@ -168,7 +173,16 @@ bool BeingDebugged() {
 // http://code.google.com/p/nativeclient/issues/detail?id=645
 #define DEBUG_BREAK() abort()
 #elif defined(ARCH_CPU_ARM_FAMILY)
+#if defined(OS_ANDROID)
+// 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")

[brettw, 2011/06/24 22:23:57]

Sorry I don't have much background in this. Why doesn't this generic ARM code
work on Android?

[michaelbai, 2011/06/24 23:30:44]

For this issue, I have to get it back to you later.

[John Grabowski, 2011/06/28 17:27:23]

In general, Android is Java based.  Android has a "helpful" process called
debuggerd to catch native signals on the general assumption that they are fatal
errors.  Although symptoms change from build to build, in general we've had
great difficulty continuing in a debugger once we stop from SIGINT triggered by
native code.  So we don't.

[brettw, 2011/06/29 16:42:28]

Can a comment be added to this effect?

[michaelbai, 2011/06/29 17:18:46]

Done.

+#endif
 #else
 #define DEBUG_BREAK() asm("int3")
 #endif