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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
135 lines
3.1 KiB
C++
135 lines
3.1 KiB
C++
//===---------------------SharingPtr.cpp ------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 assignments and
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// allow them to be queried using a pointer by a call to:
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#include <assert.h>
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#include <execinfo.h>
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#include "llvm/ADT/STLExtras.h"
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#include <map>
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#include <mutex>
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#include <vector>
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class Backtrace {
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public:
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Backtrace();
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~Backtrace();
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void GetFrames();
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void 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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Backtrace::~Backtrace() {}
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void Backtrace::GetFrames() {
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void *frames[1024];
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const int count = ::backtrace(frames, llvm::array_lengthof(frames));
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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 Backtrace::Dump() const {
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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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typedef std::pair<void *, Backtrace> PtrBacktracePair;
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typedef std::map<void *, PtrBacktracePair> PtrToBacktraceMap;
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static std::mutex g_mutex;
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std::lock_guard<std::mutex> guard(g_mutex);
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static PtrToBacktraceMap g_map;
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if (sp_this) {
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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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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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} else {
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g_map.erase(sp_this);
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}
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} else {
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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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if (ptr == NULL || pos->second.first == ptr) {
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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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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
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// 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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// Use a specially crafted call to "track_sp" which will dump info on all
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// 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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shared_count::~shared_count() {}
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void shared_count::add_shared() {
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#ifdef _MSC_VER
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_InterlockedIncrement(&shared_owners_);
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#else
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++shared_owners_;
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#endif
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}
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void shared_count::release_shared() {
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#ifdef _MSC_VER
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if (_InterlockedDecrement(&shared_owners_) == -1)
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#else
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if (--shared_owners_ == -1)
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#endif
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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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