forked from OSchip/llvm-project
169 lines
3.5 KiB
C++
169 lines
3.5 KiB
C++
//===---------------------SharingPtr.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/Utility/SharingPtr.h"
|
|
|
|
#if defined (ENABLE_SP_LOGGING)
|
|
|
|
// If ENABLE_SP_LOGGING is defined, then log all shared pointer assignments
|
|
// and allow them to be queried using a pointer by a call to:
|
|
#include <execinfo.h>
|
|
#include <map>
|
|
#include <assert.h>
|
|
#include "lldb/Host/Mutex.h"
|
|
|
|
#include "llvm/ADT/STLExtras.h"
|
|
|
|
#include <vector>
|
|
|
|
class Backtrace
|
|
{
|
|
public:
|
|
Backtrace ();
|
|
|
|
~Backtrace ();
|
|
|
|
void
|
|
GetFrames ();
|
|
|
|
void
|
|
Dump () const;
|
|
|
|
private:
|
|
void *m_sp_this;
|
|
std::vector<void *> m_frames;
|
|
};
|
|
|
|
|
|
Backtrace::Backtrace () : m_frames()
|
|
{
|
|
}
|
|
|
|
Backtrace::~Backtrace ()
|
|
{
|
|
}
|
|
|
|
void
|
|
Backtrace::GetFrames ()
|
|
{
|
|
void *frames[1024];
|
|
const int count = ::backtrace (frames, llvm::array_lengthof(frames));
|
|
if (count > 2)
|
|
m_frames.assign (frames + 2, frames + (count - 2));
|
|
}
|
|
|
|
void
|
|
Backtrace::Dump () const
|
|
{
|
|
if (!m_frames.empty())
|
|
::backtrace_symbols_fd (m_frames.data(), m_frames.size(), STDOUT_FILENO);
|
|
write (STDOUT_FILENO, "\n\n", 2);
|
|
}
|
|
|
|
extern "C" void track_sp (void *sp_this, void *ptr, long use_count)
|
|
{
|
|
typedef std::pair<void *, Backtrace> PtrBacktracePair;
|
|
typedef std::map<void *, PtrBacktracePair> PtrToBacktraceMap;
|
|
static lldb_private::Mutex g_mutex(lldb_private::Mutex::eMutexTypeNormal);
|
|
lldb_private::Mutex::Locker locker (g_mutex);
|
|
static PtrToBacktraceMap g_map;
|
|
|
|
if (sp_this)
|
|
{
|
|
printf ("sp(%p) -> %p %lu\n", sp_this, ptr, use_count);
|
|
|
|
if (ptr)
|
|
{
|
|
Backtrace bt;
|
|
bt.GetFrames();
|
|
g_map[sp_this] = std::make_pair(ptr, bt);
|
|
}
|
|
else
|
|
{
|
|
g_map.erase (sp_this);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (ptr)
|
|
printf ("Searching for shared pointers that are tracking %p: ", ptr);
|
|
else
|
|
printf ("Dump all live shared pointres: ");
|
|
|
|
uint32_t matches = 0;
|
|
PtrToBacktraceMap::iterator pos, end = g_map.end();
|
|
for (pos = g_map.begin(); pos != end; ++pos)
|
|
{
|
|
if (ptr == NULL || pos->second.first == ptr)
|
|
{
|
|
++matches;
|
|
printf ("\nsp(%p): %p\n", pos->first, pos->second.first);
|
|
pos->second.second.Dump();
|
|
}
|
|
}
|
|
if (matches == 0)
|
|
{
|
|
printf ("none.\n");
|
|
}
|
|
}
|
|
}
|
|
// Put dump_sp_refs in the lldb namespace to it gets through our exports lists filter in the LLDB.framework or lldb.so
|
|
namespace lldb {
|
|
|
|
void dump_sp_refs (void *ptr)
|
|
{
|
|
// Use a specially crafted call to "track_sp" which will
|
|
// dump info on all live shared pointers that reference "ptr"
|
|
track_sp (NULL, ptr, 0);
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
namespace lldb_private {
|
|
|
|
namespace imp
|
|
{
|
|
|
|
|
|
shared_count::~shared_count()
|
|
{
|
|
}
|
|
|
|
void
|
|
shared_count::add_shared()
|
|
{
|
|
#ifdef _MSC_VER
|
|
_InterlockedIncrement(&shared_owners_);
|
|
#else
|
|
++shared_owners_;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
shared_count::release_shared()
|
|
{
|
|
#ifdef _MSC_VER
|
|
if (_InterlockedDecrement(&shared_owners_) == -1)
|
|
#else
|
|
if (--shared_owners_ == -1)
|
|
#endif
|
|
{
|
|
on_zero_shared();
|
|
delete this;
|
|
}
|
|
}
|
|
|
|
} // imp
|
|
|
|
|
|
} // namespace lldb
|
|
|