159 lines
3.3 KiB
C++
159 lines
3.3 KiB
C++
//===---------------------SharingPtr.cpp ------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Utility/SharingPtr.h"
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#if defined (ENABLE_SP_LOGGING)
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// If ENABLE_SP_LOGGING is defined, then log all shared pointer assignements
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// and allow them to be queried using a pointer by a call to:
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#include <execinfo.h>
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#include <map>
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#include <assert.h>
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#include "lldb/Host/Mutex.h"
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#include <vector>
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class Backtrace
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{
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public:
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Backtrace ();
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~Backtrace ();
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void
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GetFrames ();
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void
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Dump () const;
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private:
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void *m_sp_this;
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std::vector<void *> m_frames;
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};
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Backtrace::Backtrace () : m_frames()
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{
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}
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Backtrace::~Backtrace ()
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{
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}
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void
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Backtrace::GetFrames ()
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{
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void *frames[1024];
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const int count = ::backtrace (frames, sizeof(frames)/sizeof(void*));
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if (count > 2)
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m_frames.assign (frames + 2, frames + (count - 2));
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}
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void
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Backtrace::Dump () const
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{
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if (!m_frames.empty())
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::backtrace_symbols_fd (m_frames.data(), m_frames.size(), STDOUT_FILENO);
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write (STDOUT_FILENO, "\n\n", 2);
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}
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extern "C" void track_sp (void *sp_this, void *ptr, long use_count)
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{
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typedef std::pair<void *, Backtrace> PtrBacktracePair;
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typedef std::map<void *, PtrBacktracePair> PtrToBacktraceMap;
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static lldb_private::Mutex g_mutex(lldb_private::Mutex::eMutexTypeNormal);
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lldb_private::Mutex::Locker locker (g_mutex);
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static PtrToBacktraceMap g_map;
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if (sp_this)
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{
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printf ("sp(%p) -> %p %lu\n", sp_this, ptr, use_count);
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if (ptr)
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{
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Backtrace bt;
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bt.GetFrames();
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g_map[sp_this] = std::make_pair(ptr, bt);
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}
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else
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{
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g_map.erase (sp_this);
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}
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}
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else
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{
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if (ptr)
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printf ("Searching for shared pointers that are tracking %p: ", ptr);
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else
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printf ("Dump all live shared pointres: ");
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uint32_t matches = 0;
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PtrToBacktraceMap::iterator pos, end = g_map.end();
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for (pos = g_map.begin(); pos != end; ++pos)
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{
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if (ptr == NULL || pos->second.first == ptr)
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{
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++matches;
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printf ("\nsp(%p): %p\n", pos->first, pos->second.first);
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pos->second.second.Dump();
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}
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}
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if (matches == 0)
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{
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printf ("none.\n");
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}
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}
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}
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// Put dump_sp_refs in the lldb namespace to it gets through our exports lists filter in the LLDB.framework or lldb.so
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namespace lldb {
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void dump_sp_refs (void *ptr)
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{
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// Use a specially crafted call to "track_sp" which will
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// dump info on all live shared pointers that reference "ptr"
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track_sp (NULL, ptr, 0);
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}
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}
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#endif
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namespace lldb_private {
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namespace imp
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{
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shared_count::~shared_count()
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{
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}
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void
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shared_count::add_shared()
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{
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increment(shared_owners_);
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}
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void
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shared_count::release_shared()
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{
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if (decrement(shared_owners_) == -1)
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{
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on_zero_shared();
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delete this;
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}
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}
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} // imp
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} // namespace lldb
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