Move debug-related stuff from base to the base/debug directory and use the...

base/debug/stack_trace_posix.cc

 // Copyright (c) 2010 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_util.h"
+#include "base/debug/stack_trace.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/stat.h>
 #include <sys/sysctl.h>
 #include <sys/types.h>
 #include <unistd.h>
 
@@ skipping 16 matching lines @@
 #include "base/logging.h"
 #include "base/safe_strerror_posix.h"
 #include "base/scoped_ptr.h"
 #include "base/string_piece.h"
 #include "base/stringprintf.h"
 
 #if defined(USE_SYMBOLIZE)
 #include "base/third_party/symbolize/symbolize.h"
 #endif
 
+namespace base {
+namespace debug {
+
 namespace {
+
 // The prefix used for mangled symbols, per the Itanium C++ ABI:
 // http://www.codesourcery.com/cxx-abi/abi.html#mangling
 const char kMangledSymbolPrefix[] = "_Z";
 
 // Characters that can be used for symbols, generated by Ruby:
 // (('a'..'z').to_a+('A'..'Z').to_a+('0'..'9').to_a + ['_']).join
 const char kSymbolCharacters[] =
     "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_";
 
 #if !defined(USE_SYMBOLIZE)
@@ skipping 85 matching lines @@
       trace_strings->push_back(base::StringPrintf("%p", trace[i]));
     }
   }
 #endif  // defined(USE_SYMBOLIZE)
 
   return symbolized;
 }
 
 }  // namespace
 
-// static
-bool DebugUtil::SpawnDebuggerOnProcess(unsigned /* process_id */) {
-  NOTIMPLEMENTED();
-  return false;
-}
-
-#if defined(OS_MACOSX)
-
-// Based on Apple's recommended method as described in
-// http://developer.apple.com/qa/qa2004/qa1361.html
-// static
-bool DebugUtil::BeingDebugged() {
-  // If the process is sandboxed then we can't use the sysctl, so cache the
-  // value.
-  static bool is_set = false;
-  static bool being_debugged = false;
-
-  if (is_set) {
-    return being_debugged;
-  }
-
-  // Initialize mib, which tells sysctl what info we want.  In this case,
-  // we're looking for information about a specific process ID.
-  int mib[] = {
-    CTL_KERN,
-    KERN_PROC,
-    KERN_PROC_PID,
-    getpid()
-  };
-
-  // Caution: struct kinfo_proc is marked __APPLE_API_UNSTABLE.  The source and
-  // binary interfaces may change.
-  struct kinfo_proc info;
-  size_t info_size = sizeof(info);
-
-  int sysctl_result = sysctl(mib, arraysize(mib), &info, &info_size, NULL, 0);
-  DCHECK_EQ(sysctl_result, 0);
-  if (sysctl_result != 0) {
-    is_set = true;
-    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)
-
-// 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 DebugUtil::BeingDebugged() {
-  int status_fd = open("/proc/self/status", O_RDONLY);
-  if (status_fd == -1)
-    return false;
-
-  // We assume our line will be in the first 1024 characters and that we can
-  // read this much all at once.  In practice this will generally be true.
-  // This simplifies and speeds up things considerably.
-  char buf[1024];
-
-  ssize_t num_read = HANDLE_EINTR(read(status_fd, buf, sizeof(buf)));
-  if (HANDLE_EINTR(close(status_fd)) < 0)
-    return false;
-
-  if (num_read <= 0)
-    return false;
-
-  base::StringPiece status(buf, num_read);
-  base::StringPiece tracer("TracerPid:\t");
-
-  base::StringPiece::size_type pid_index = status.find(tracer);
-  if (pid_index == base::StringPiece::npos)
-    return false;
-
-  // Our pid is 0 without a debugger, assume this for any pid starting with 0.
-  pid_index += tracer.size();
-  return pid_index < status.size() && status[pid_index] != '0';
-}
-
-#elif defined(OS_FREEBSD)
-
-bool DebugUtil::BeingDebugged() {
-  // TODO(benl): can we determine this under FreeBSD?
-  NOTIMPLEMENTED();
-  return false;
-}
-
-#endif  // defined(OS_FREEBSD)
-
-// We want to break into the debugger in Debug mode, and cause a crash dump in
-// Release mode. Breakpad behaves as follows:
-//
-// +-------+-----------------+-----------------+
-// | 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)
-#define DEBUG_BREAK() abort()
-#elif defined(ARCH_CPU_ARM_FAMILY)
-#define DEBUG_BREAK() asm("bkpt 0")
-#else
-#define DEBUG_BREAK() asm("int3")
-#endif
-
-// static
-void DebugUtil::BreakDebugger() {
-  DEBUG_BREAK();
-}
-
 StackTrace::StackTrace() {
 #if defined(OS_MACOSX) && MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5
   if (backtrace == NULL) {
     count_ = 0;
     return;
   }
 #endif
   // Though the backtrace API man page does not list any possible negative
   // return values, we take no chance.
   count_ = std::max(backtrace(trace_, arraysize(trace_)), 0);
@@ skipping 25 matching lines @@
     if (!error_message.empty())
       error_message = " (" + error_message + ")";
     (*os) << "Unable to get symbols for backtrace" << error_message << ". "
           << "Dumping raw addresses in trace:\n";
   }
 
   for (size_t i = 0; i < trace_strings.size(); ++i) {
     (*os) << "\t" << trace_strings[i] << "\n";
   }
 }
+
+}  // namespace debug
+}  // namespace base