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author | 2020-08-03 14:33:06 +0000 | |
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committer | 2020-08-03 14:33:06 +0000 | |
commit | 061da546b983eb767bad15e67af1174fb0bcf31c (patch) | |
tree | 83c78b820819d70aa40c36d90447978b300078c5 /gnu/llvm/lldb/source/Utility/SharingPtr.cpp | |
parent | Import LLVM 10.0.0 release including clang, lld and lldb. (diff) | |
download | wireguard-openbsd-061da546b983eb767bad15e67af1174fb0bcf31c.tar.xz wireguard-openbsd-061da546b983eb767bad15e67af1174fb0bcf31c.zip |
Import LLVM 10.0.0 release including clang, lld and lldb.
ok hackroom
tested by plenty
Diffstat (limited to 'gnu/llvm/lldb/source/Utility/SharingPtr.cpp')
-rw-r--r-- | gnu/llvm/lldb/source/Utility/SharingPtr.cpp | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/gnu/llvm/lldb/source/Utility/SharingPtr.cpp b/gnu/llvm/lldb/source/Utility/SharingPtr.cpp new file mode 100644 index 00000000000..45f2a773758 --- /dev/null +++ b/gnu/llvm/lldb/source/Utility/SharingPtr.cpp @@ -0,0 +1,134 @@ +//===---------------------SharingPtr.cpp ------------------------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#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 <assert.h> +#include <execinfo.h> + +#include "llvm/ADT/STLExtras.h" + +#include <map> +#include <mutex> +#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 std::mutex g_mutex; + std::lock_guard<std::mutex> guard(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 |