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authorpatrick <patrick@openbsd.org>2020-08-03 14:33:06 +0000
committerpatrick <patrick@openbsd.org>2020-08-03 14:33:06 +0000
commit061da546b983eb767bad15e67af1174fb0bcf31c (patch)
tree83c78b820819d70aa40c36d90447978b300078c5 /gnu/llvm/lldb/source/Utility/SharingPtr.cpp
parentImport LLVM 10.0.0 release including clang, lld and lldb. (diff)
downloadwireguard-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.cpp134
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