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Raphael Isemann
808142876c
Summary: A *.cpp file header in LLDB (and in LLDB) should like this: ``` //===-- TestUtilities.cpp -------------------------------------------------===// ``` However in LLDB most of our source files have arbitrary changes to this format and these changes are spreading through LLDB as folks usually just use the existing source files as templates for their new files (most notably the unnecessary editor language indicator `-*- C++ -*-` is spreading and in every review someone is pointing out that this is wrong, resulting in people pointing out that this is done in the same way in other files). This patch removes most of these inconsistencies including the editor language indicators, all the different missing/additional '-' characters, files that center the file name, missing trailing `===//` (mostly caused by clang-format breaking the line). Reviewers: aprantl, espindola, jfb, shafik, JDevlieghere Reviewed By: JDevlieghere Subscribers: dexonsmith, wuzish, emaste, sdardis, nemanjai, kbarton, MaskRay, atanasyan, arphaman, jfb, abidh, jsji, JDevlieghere, usaxena95, lldb-commits Tags: #lldb Differential Revision: https://reviews.llvm.org/D73258
135 lines
3.1 KiB
C++
135 lines
3.1 KiB
C++
//===-- SharingPtr.cpp ----------------------------------------------------===//
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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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