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llvm/lldb/source/lldb-log.cpp
Greg Clayton 5160ce5c72 <rdar://problem/13521159> 
LLDB is crashing when logging is enabled from lldb-perf-clang. This has to do with the global destructor chain as the process and its threads are being torn down.

All logging channels now make one and only one instance that is kept in a global pointer which is never freed. This guarantees that logging can correctly continue as the process tears itself down.

llvm-svn: 178191
2013-03-27 23:08:40 +00:00

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//===-- lldb-log.cpp --------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/lldb-private-log.h"
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/Interpreter/Args.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/StreamFile.h"
#include <string.h>
using namespace lldb;
using namespace lldb_private;
// We want to avoid global constructors where code needs to be run so here we
// control access to our static g_log_sp by hiding it in a singleton function
// that will construct the static g_lob_sp the first time this function is
// called.
static bool g_log_enabled = false;
static Log * g_log = NULL;
static Log *
GetLog ()
{
if (!g_log_enabled)
return NULL;
return g_log;
}
uint32_t
lldb_private::GetLogMask ()
{
Log *log(GetLog ());
if (log)
return log->GetMask().Get();
return 0;
}
bool
lldb_private::IsLogVerbose ()
{
uint32_t mask = GetLogMask();
return (mask & LIBLLDB_LOG_VERBOSE);
}
Log *
lldb_private::GetLogIfAllCategoriesSet (uint32_t mask)
{
Log *log(GetLog ());
if (log && mask)
{
uint32_t log_mask = log->GetMask().Get();
if ((log_mask & mask) != mask)
return NULL;
}
return log;
}
void
lldb_private::LogIfAllCategoriesSet (uint32_t mask, const char *format, ...)
{
Log *log(GetLogIfAllCategoriesSet (mask));
if (log)
{
va_list args;
va_start (args, format);
log->VAPrintf (format, args);
va_end (args);
}
}
void
lldb_private::LogIfAnyCategoriesSet (uint32_t mask, const char *format, ...)
{
Log *log(GetLogIfAnyCategoriesSet (mask));
if (log)
{
va_list args;
va_start (args, format);
log->VAPrintf (format, args);
va_end (args);
}
}
Log *
lldb_private::GetLogIfAnyCategoriesSet (uint32_t mask)
{
Log *log(GetLog ());
if (log && mask && (mask & log->GetMask().Get()))
return log;
return NULL;
}
void
lldb_private::DisableLog (const char **categories, Stream *feedback_strm)
{
Log *log(GetLog ());
if (log)
{
uint32_t flag_bits = 0;
if (categories[0] != NULL)
{
flag_bits = log->GetMask().Get();
for (size_t i = 0; categories[i] != NULL; ++i)
{
const char *arg = categories[i];
if (0 == ::strcasecmp(arg, "all")) flag_bits &= ~LIBLLDB_LOG_ALL;
else if (0 == ::strcasecmp(arg, "api")) flag_bits &= ~LIBLLDB_LOG_API;
else if (0 == ::strncasecmp(arg, "break", 5)) flag_bits &= ~LIBLLDB_LOG_BREAKPOINTS;
else if (0 == ::strcasecmp(arg, "commands")) flag_bits &= ~LIBLLDB_LOG_COMMANDS;
else if (0 == ::strcasecmp(arg, "default")) flag_bits &= ~LIBLLDB_LOG_DEFAULT;
else if (0 == ::strcasecmp(arg, "dyld")) flag_bits &= ~LIBLLDB_LOG_DYNAMIC_LOADER;
else if (0 == ::strncasecmp(arg, "event", 5)) flag_bits &= ~LIBLLDB_LOG_EVENTS;
else if (0 == ::strncasecmp(arg, "expr", 4)) flag_bits &= ~LIBLLDB_LOG_EXPRESSIONS;
else if (0 == ::strncasecmp(arg, "object", 6)) flag_bits &= ~LIBLLDB_LOG_OBJECT;
else if (0 == ::strcasecmp(arg, "process")) flag_bits &= ~LIBLLDB_LOG_PROCESS;
else if (0 == ::strcasecmp(arg, "script")) flag_bits &= ~LIBLLDB_LOG_SCRIPT;
else if (0 == ::strcasecmp(arg, "state")) flag_bits &= ~LIBLLDB_LOG_STATE;
else if (0 == ::strcasecmp(arg, "step")) flag_bits &= ~LIBLLDB_LOG_STEP;
else if (0 == ::strcasecmp(arg, "thread")) flag_bits &= ~LIBLLDB_LOG_THREAD;
else if (0 == ::strcasecmp(arg, "target")) flag_bits &= ~LIBLLDB_LOG_TARGET;
else if (0 == ::strcasecmp(arg, "verbose")) flag_bits &= ~LIBLLDB_LOG_VERBOSE;
else if (0 == ::strncasecmp(arg, "watch", 5)) flag_bits &= ~LIBLLDB_LOG_WATCHPOINTS;
else if (0 == ::strncasecmp(arg, "temp", 4)) flag_bits &= ~LIBLLDB_LOG_TEMPORARY;
else if (0 == ::strncasecmp(arg, "comm", 4)) flag_bits &= ~LIBLLDB_LOG_COMMUNICATION;
else if (0 == ::strncasecmp(arg, "conn", 4)) flag_bits &= ~LIBLLDB_LOG_CONNECTION;
else if (0 == ::strncasecmp(arg, "host", 4)) flag_bits &= ~LIBLLDB_LOG_HOST;
else if (0 == ::strncasecmp(arg, "unwind", 6)) flag_bits &= ~LIBLLDB_LOG_UNWIND;
else if (0 == ::strncasecmp(arg, "types", 5)) flag_bits &= ~LIBLLDB_LOG_TYPES;
else if (0 == ::strncasecmp(arg, "symbol", 6)) flag_bits &= ~LIBLLDB_LOG_SYMBOLS;
else if (0 == ::strncasecmp(arg, "module", 6)) flag_bits &= ~LIBLLDB_LOG_MODULES;
else if (0 == ::strncasecmp(arg, "mmap", 4)) flag_bits &= ~LIBLLDB_LOG_MMAP;
else
{
feedback_strm->Printf ("error: unrecognized log category '%s'\n", arg);
ListLogCategories (feedback_strm);
return;
}
}
}
log->GetMask().Reset (flag_bits);
if (flag_bits == 0)
g_log_enabled = false;
}
return;
}
Log *
lldb_private::EnableLog (StreamSP &log_stream_sp, uint32_t log_options, const char **categories, Stream *feedback_strm)
{
// Try see if there already is a log - that way we can reuse its settings.
// We could reuse the log in toto, but we don't know that the stream is the same.
uint32_t flag_bits;
if (g_log)
flag_bits = g_log->GetMask().Get();
else
flag_bits = 0;
// Now make a new log with this stream if one was provided
if (log_stream_sp)
{
if (g_log)
g_log->SetStream(log_stream_sp);
else
g_log = new Log(log_stream_sp);
}
if (g_log)
{
for (size_t i=0; categories[i] != NULL; ++i)
{
const char *arg = categories[i];
if (0 == ::strcasecmp(arg, "all")) flag_bits |= LIBLLDB_LOG_ALL;
else if (0 == ::strcasecmp(arg, "api")) flag_bits |= LIBLLDB_LOG_API;
else if (0 == ::strncasecmp(arg, "break", 5)) flag_bits |= LIBLLDB_LOG_BREAKPOINTS;
else if (0 == ::strcasecmp(arg, "commands")) flag_bits |= LIBLLDB_LOG_COMMANDS;
else if (0 == ::strcasecmp(arg, "default")) flag_bits |= LIBLLDB_LOG_DEFAULT;
else if (0 == ::strcasecmp(arg, "dyld")) flag_bits |= LIBLLDB_LOG_DYNAMIC_LOADER;
else if (0 == ::strncasecmp(arg, "event", 5)) flag_bits |= LIBLLDB_LOG_EVENTS;
else if (0 == ::strncasecmp(arg, "expr", 4)) flag_bits |= LIBLLDB_LOG_EXPRESSIONS;
else if (0 == ::strncasecmp(arg, "object", 6)) flag_bits |= LIBLLDB_LOG_OBJECT;
else if (0 == ::strcasecmp(arg, "process")) flag_bits |= LIBLLDB_LOG_PROCESS;
else if (0 == ::strcasecmp(arg, "script")) flag_bits |= LIBLLDB_LOG_SCRIPT;
else if (0 == ::strcasecmp(arg, "state")) flag_bits |= LIBLLDB_LOG_STATE;
else if (0 == ::strcasecmp(arg, "step")) flag_bits |= LIBLLDB_LOG_STEP;
else if (0 == ::strcasecmp(arg, "thread")) flag_bits |= LIBLLDB_LOG_THREAD;
else if (0 == ::strcasecmp(arg, "target")) flag_bits |= LIBLLDB_LOG_TARGET;
else if (0 == ::strcasecmp(arg, "verbose")) flag_bits |= LIBLLDB_LOG_VERBOSE;
else if (0 == ::strncasecmp(arg, "watch", 5)) flag_bits |= LIBLLDB_LOG_WATCHPOINTS;
else if (0 == ::strncasecmp(arg, "temp", 4)) flag_bits |= LIBLLDB_LOG_TEMPORARY;
else if (0 == ::strncasecmp(arg, "comm", 4)) flag_bits |= LIBLLDB_LOG_COMMUNICATION;
else if (0 == ::strncasecmp(arg, "conn", 4)) flag_bits |= LIBLLDB_LOG_CONNECTION;
else if (0 == ::strncasecmp(arg, "host", 4)) flag_bits |= LIBLLDB_LOG_HOST;
else if (0 == ::strncasecmp(arg, "unwind", 6)) flag_bits |= LIBLLDB_LOG_UNWIND;
else if (0 == ::strncasecmp(arg, "types", 5)) flag_bits |= LIBLLDB_LOG_TYPES;
else if (0 == ::strncasecmp(arg, "symbol", 6)) flag_bits |= LIBLLDB_LOG_SYMBOLS;
else if (0 == ::strncasecmp(arg, "module", 6)) flag_bits |= LIBLLDB_LOG_MODULES;
else if (0 == ::strncasecmp(arg, "mmap", 4)) flag_bits |= LIBLLDB_LOG_MMAP;
else
{
feedback_strm->Printf("error: unrecognized log category '%s'\n", arg);
ListLogCategories (feedback_strm);
return g_log;
}
}
g_log->GetMask().Reset(flag_bits);
g_log->GetOptions().Reset(log_options);
}
g_log_enabled = true;
return g_log;
}
void
lldb_private::ListLogCategories (Stream *strm)
{
strm->Printf("Logging categories for 'lldb':\n"
" all - turn on all available logging categories\n"
" api - enable logging of API calls and return values\n"
" break - log breakpoints\n"
" command - log command argument parsing\n"
" default - enable the default set of logging categories for liblldb\n"
" dyld - log shared library related activities\n"
" events - log broadcaster, listener and event queue activities\n"
" expr - log expressions\n"
" object - log object construction/destruction for important objects\n"
" module - log module activities such as when modules are created, detroyed, replaced, and more\n"
" process - log process events and activities\n"
" script - log events about the script interpreter\n"
" state - log private and public process state changes\n"
" step - log step related activities\n"
" symbol - log symbol related issues and warnings\n"
" target - log target events and activities\n"
" thread - log thread events and activities\n"
" types - log type system related activities\n"
" unwind - log stack unwind activities\n"
" verbose - enable verbose logging\n"
" watch - log watchpoint related activities\n");
}
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