feat add gperftools

3party/gperftools/src/getpc.h

@@ -0,0 +1,99 @@
+// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
+// Copyright (c) 2005, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ---
+// Author: Craig Silverstein
+//
+// This is an internal header file used by profiler.cc.  It defines
+// the single (inline) function GetPC.  GetPC is used in a signal
+// handler to figure out the instruction that was being executed when
+// the signal-handler was triggered.
+//
+// To get this, we use the ucontext_t argument to the signal-handler
+// callback, which holds the full context of what was going on when
+// the signal triggered.  How to get from a ucontext_t to a Program
+// Counter is OS-dependent.
+
+#ifndef BASE_GETPC_H_
+#define BASE_GETPC_H_
+
+// Note: we include this from one of configure script C++ tests as
+// part of verifying that we're able to build CPU profiler. I.e. we
+// cannot include config.h as we normally do, since it isn't produced
+// yet, but those HAVE_XYZ defines are available, so including
+// ucontext etc stuff works. It's usage from profiler.cc (and
+// stacktrace_generic_fp-inl.h) is after config.h is included.
+
+// On many linux systems, we may need _GNU_SOURCE to get access to
+// the defined constants that define the register we want to see (eg
+// REG_EIP).  Note this #define must come first!
+#define _GNU_SOURCE 1
+
+#ifdef HAVE_ASM_PTRACE_H
+#include <asm/ptrace.h>
+#endif
+#if HAVE_SYS_UCONTEXT_H
+#include <sys/ucontext.h>
+#elif HAVE_UCONTEXT_H
+#include <ucontext.h>       // for ucontext_t (and also mcontext_t)
+#elif defined(HAVE_CYGWIN_SIGNAL_H)
+#include <cygwin/signal.h>
+typedef ucontext ucontext_t;
+#endif
+
+namespace tcmalloc {
+namespace getpc {
+
+// std::void_t is C++ 14. So we steal this from
+// https://en.cppreference.com/w/cpp/types/void_t
+template<typename... Ts>
+struct make_void { typedef void type; };
+template <typename... Ts>
+using void_t = typename make_void<Ts...>::type;
+
+#include "getpc-inl.h"
+
+}  // namespace getpc
+}  // namespace tcmalloc
+
+// If this doesn't compile, you need to figure out the right value for
+// your system, and add it to the list above.
+inline void* GetPC(const ucontext_t& signal_ucontext) {
+  void* retval = tcmalloc::getpc::internal::RawUCToPC(&signal_ucontext);
+
+#if defined(__s390__) && !defined(__s390x__)
+  // Mask out the AMODE31 bit from the PC recorded in the context.
+  retval = (void*)((unsigned long)retval & 0x7fffffffUL);
+#endif
+
+  return retval;
+}
+
+#endif  // BASE_GETPC_H_