chore(3p/abseil_cpp): unvendor abseil_cpp r/3786

we weren't actually using these sources anymore, okay?

Change-Id: If701571d9716de308d3512e1eb22c35db0877a66
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5248
Tested-by: BuildkiteCI
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: tazjin <tazjin@tvl.su>

1 files changed, 0 insertions, 108 deletions

diff --git a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_generic-inl.inc b/third_party/abseil_cpp/absl/debugging/internal/stacktrace_generic-inl.inc
deleted file mode 100644
index b2792a1f3ada..000000000000
--- a/third_party/abseil_cpp/absl/debugging/internal/stacktrace_generic-inl.inc
+++ /dev/null
@@ -1,108 +0,0 @@
-// Copyright 2017 The Abseil Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-// Portable implementation - just use glibc
-//
-// Note:  The glibc implementation may cause a call to malloc.
-// This can cause a deadlock in HeapProfiler.
-
-#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_
-#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_
-
-#include <execinfo.h>
-#include <atomic>
-#include <cstring>
-
-#include "absl/debugging/stacktrace.h"
-#include "absl/base/attributes.h"
-
-// Sometimes, we can try to get a stack trace from within a stack
-// trace, because we don't block signals inside this code (which would be too
-// expensive: the two extra system calls per stack trace do matter here).
-// That can cause a self-deadlock.
-// Protect against such reentrant call by failing to get a stack trace.
-//
-// We use __thread here because the code here is extremely low level -- it is
-// called while collecting stack traces from within malloc and mmap, and thus
-// can not call anything which might call malloc or mmap itself.
-static __thread int recursive = 0;
-
-// The stack trace function might be invoked very early in the program's
-// execution (e.g. from the very first malloc if using tcmalloc). Also, the
-// glibc implementation itself will trigger malloc the first time it is called.
-// As such, we suppress usage of backtrace during this early stage of execution.
-static std::atomic<bool> disable_stacktraces(true);  // Disabled until healthy.
-// Waiting until static initializers run seems to be late enough.
-// This file is included into stacktrace.cc so this will only run once.
-ABSL_ATTRIBUTE_UNUSED static int stacktraces_enabler = []() {
-  void* unused_stack[1];
-  // Force the first backtrace to happen early to get the one-time shared lib
-  // loading (allocation) out of the way. After the first call it is much safer
-  // to use backtrace from a signal handler if we crash somewhere later.
-  backtrace(unused_stack, 1);
-  disable_stacktraces.store(false, std::memory_order_relaxed);
-  return 0;
-}();
-
-template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT>
-static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count,
-                      const void *ucp, int *min_dropped_frames) {
-  if (recursive || disable_stacktraces.load(std::memory_order_relaxed)) {
-    return 0;
-  }
-  ++recursive;
-
-  static_cast<void>(ucp);  // Unused.
-  static const int kStackLength = 64;
-  void * stack[kStackLength];
-  int size;
-
-  size = backtrace(stack, kStackLength);
-  skip_count++;  // we want to skip the current frame as well
-  int result_count = size - skip_count;
-  if (result_count < 0)
-    result_count = 0;
-  if (result_count > max_depth)
-    result_count = max_depth;
-  for (int i = 0; i < result_count; i++)
-    result[i] = stack[i + skip_count];
-
-  if (IS_STACK_FRAMES) {
-    // No implementation for finding out the stack frame sizes yet.
-    memset(sizes, 0, sizeof(*sizes) * result_count);
-  }
-  if (min_dropped_frames != nullptr) {
-    if (size - skip_count - max_depth > 0) {
-      *min_dropped_frames = size - skip_count - max_depth;
-    } else {
-      *min_dropped_frames = 0;
-    }
-  }
-
-  --recursive;
-
-  return result_count;
-}
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace debugging_internal {
-bool StackTraceWorksForTest() {
-  return true;
-}
-}  // namespace debugging_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_DEBUGGING_INTERNAL_STACKTRACE_GENERIC_INL_H_