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author | thegeorg <thegeorg@yandex-team.ru> | 2022-02-10 16:45:08 +0300 |
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committer | Daniil Cherednik <dcherednik@yandex-team.ru> | 2022-02-10 16:45:08 +0300 |
commit | 4e839db24a3bbc9f1c610c43d6faaaa99824dcca (patch) | |
tree | 506dac10f5df94fab310584ee51b24fc5a081c22 /contrib/restricted/abseil-cpp/absl/debugging/internal/stacktrace_emscripten-inl.inc | |
parent | 2d37894b1b037cf24231090eda8589bbb44fb6fc (diff) | |
download | ydb-4e839db24a3bbc9f1c610c43d6faaaa99824dcca.tar.gz |
Restoring authorship annotation for <thegeorg@yandex-team.ru>. Commit 1 of 2.
Diffstat (limited to 'contrib/restricted/abseil-cpp/absl/debugging/internal/stacktrace_emscripten-inl.inc')
-rw-r--r-- | contrib/restricted/abseil-cpp/absl/debugging/internal/stacktrace_emscripten-inl.inc | 220 |
1 files changed, 110 insertions, 110 deletions
diff --git a/contrib/restricted/abseil-cpp/absl/debugging/internal/stacktrace_emscripten-inl.inc b/contrib/restricted/abseil-cpp/absl/debugging/internal/stacktrace_emscripten-inl.inc index 16522102f6..750f6464b8 100644 --- a/contrib/restricted/abseil-cpp/absl/debugging/internal/stacktrace_emscripten-inl.inc +++ b/contrib/restricted/abseil-cpp/absl/debugging/internal/stacktrace_emscripten-inl.inc @@ -1,110 +1,110 @@ -// 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_EMSCRIPTEN_INL_H_ -#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_EMSCRIPTEN_INL_H_ - -#error #include <emscripten.h> - -#include <atomic> -#include <cstring> - -#include "absl/base/attributes.h" -#include "absl/debugging/stacktrace.h" - -extern "C" { -uintptr_t emscripten_stack_snapshot(); -uint32_t emscripten_stack_unwind_buffer(uintptr_t pc, void *buffer, - uint32_t depth); -} - -// Sometimes, we can try to get a stack trace from within a stack -// trace, which 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). -// 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 = []() { - // Check if we can even create stacktraces. If not, bail early and leave - // disable_stacktraces set as-is. - // clang-format off - if (!EM_ASM_INT({ return (typeof wasmOffsetConverter !== 'undefined'); })) { - return 0; - } - // clang-format on - 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. - constexpr int kStackLength = 64; - void *stack[kStackLength]; - - int size; - uintptr_t pc = emscripten_stack_snapshot(); - size = emscripten_stack_unwind_buffer(pc, stack, kStackLength); - - 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_EMSCRIPTEN_INL_H_ +// 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_EMSCRIPTEN_INL_H_ +#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_EMSCRIPTEN_INL_H_ + +#error #include <emscripten.h> + +#include <atomic> +#include <cstring> + +#include "absl/base/attributes.h" +#include "absl/debugging/stacktrace.h" + +extern "C" { +uintptr_t emscripten_stack_snapshot(); +uint32_t emscripten_stack_unwind_buffer(uintptr_t pc, void *buffer, + uint32_t depth); +} + +// Sometimes, we can try to get a stack trace from within a stack +// trace, which 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). +// 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 = []() { + // Check if we can even create stacktraces. If not, bail early and leave + // disable_stacktraces set as-is. + // clang-format off + if (!EM_ASM_INT({ return (typeof wasmOffsetConverter !== 'undefined'); })) { + return 0; + } + // clang-format on + 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. + constexpr int kStackLength = 64; + void *stack[kStackLength]; + + int size; + uintptr_t pc = emscripten_stack_snapshot(); + size = emscripten_stack_unwind_buffer(pc, stack, kStackLength); + + 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_EMSCRIPTEN_INL_H_ |