- b527a3e4b36b644ac424e3c525b1cd393f6f6c40 Fix some typos in the usage examples by Jorg Brown <jorg@google.com>
- 82be4a9adf3bb0ddafc0d46274969c99afffe870 Fix typo in optional.h comment. by Abseil Team <absl-team@google.com>
- d6ee63bf8fc51fba074c23b33cebc28c808d7f07 Remove internal-only identifiers from code. by Daniel Katz <katzdm@google.com>
- f9c3ad2f0d73f53b21603638af8b4bed636e79f4 Use easier understandable names for absl::StartsWith and ... by Abseil Team <absl-team@google.com>
- 7c16c14fefee89c927b8789d6043c4691bcffc9b Add -Wno-missing-prototypes back to the LLVM copts. by Derek Mauro <dmauro@google.com>
- 2f4b7d2e50c7023240242f1e15db60ccd7e8768d IWYU | absl/strings by Juemin Yang <jueminyang@google.com>
- a99cbcc1daa34a2d6a2bb26de275e05173cc77e9 IWYU | absl/type by Juemin Yang <jueminyang@google.com>
- 12e1146d0fc76c071d7e0ebaabb62f0a984fae66 Use LLVM_FLAGS and LLVM_TEST_FLAGS when --compiler=llvm. by Derek Mauro <dmauro@google.com>
- cd6bea616abda558d0bace5bd77455662a233688 IWYU | absl/debugging by Juemin Yang <jueminyang@google.com>
- d9a7382e59d46a8581b6b7a31cd5a48bb89326e9 IWYU | absl/synchronization by Juemin Yang <jueminyang@google.com>
- 07ec7d6d5a4a666f4183c5d0ed9c342baa7b24bc IWYU | absl/numeric by Juemin Yang <jueminyang@google.com>
- 12bfe40051f4270f8707e191af5652f83f2f750c Remove the RoundTrip{Float,Double}ToBuffer routines from ... by Jorg Brown <jorg@google.com>
- eeb4fd67c9d97f66cb9475c3c5e51ab132f1c810 Adds conversion functions for converting between absl/tim... by Greg Miller <jgm@google.com>
- 59a2108d05d4ea85dc5cc11e49b2cd2335d4295a Change Substitute to use %.6g formatting rather than 15/1... by Jorg Brown <jorg@google.com>
- 394becb48e0fcd161642cdaac5120d32567e0ef8 IWYU | absl/meta by Juemin Yang <jueminyang@google.com>
- 1e5da6e8da336699b2469dcf6dda025b9b0ec4c9 Rewrite atomic_hook.h to not use std::atomic<T*> under Wi... by Greg Falcon <gfalcon@google.com>
GitOrigin-RevId: b527a3e4b36b644ac424e3c525b1cd393f6f6c40
Change-Id: I14e331d91c956ef045ac7927091a9f179716de0c
pull/1/head
Abseil Team
7 years ago
committed by
Derek Mauro
parent
53c239d1fc
commit
cf6ab6bb2b
68 changed files with 629 additions and 831 deletions
@ -1,128 +0,0 @@ |
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// Copyright 2017 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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|
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#ifndef ABSL_DEBUGGING_INTERNAL_STACKTRACE_LIBUNWIND_INL_H_ |
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#define ABSL_DEBUGGING_INTERNAL_STACKTRACE_LIBUNWIND_INL_H_ |
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|
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// We only need local unwinder. |
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#define UNW_LOCAL_ONLY |
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|
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extern "C" { |
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#include "third_party/libunwind/include/libunwind.h" |
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} |
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#include "absl/debugging/stacktrace.h" |
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|
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#include "absl/base/dynamic_annotations.h" |
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#include "absl/base/internal/raw_logging.h" |
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|
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// Sometimes, we can try to get a stack trace from within a stack |
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// trace, because we don't block signals inside libunwind (which would be too |
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// expensive: the two extra system calls per stack trace do matter here). |
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// That can cause a self-deadlock (as in http://b/5722312). |
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// Protect against such reentrant call by failing to get a stack trace. |
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// |
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// We use __thread here because the code here is extremely low level -- it is |
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// called while collecting stack traces from within malloc and mmap, and thus |
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// can not call anything which might call malloc or mmap itself. |
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// In particular, using PerThread or STATIC_THREAD_LOCAL_POD |
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// here will cause infinite recursion for at least dbg/piii builds with |
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// crosstool-v12. |
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static __thread int recursive; |
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|
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template <bool IS_STACK_FRAMES, bool IS_WITH_CONTEXT> |
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static int UnwindImpl(void** result, int* sizes, int max_depth, int skip_count, |
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const void *, int *min_dropped_frames) { |
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if (recursive) { |
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return 0; |
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} |
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++recursive; |
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|
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int n = 0; |
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if (IS_STACK_FRAMES) { |
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void *ip; |
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unw_cursor_t cursor; |
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unw_context_t uc; |
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unw_word_t sp = 0, next_sp = 0; |
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unw_getcontext(&uc); |
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ABSL_RAW_CHECK(unw_init_local(&cursor, &uc) >= 0, "unw_init_local failed"); |
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skip_count++; // Do not include current frame |
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|
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while (skip_count--) { |
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if (unw_step(&cursor) <= 0) { |
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goto out; |
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} |
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if (unw_get_reg(&cursor, UNW_REG_SP, &next_sp)) { |
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goto out; |
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} |
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} |
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|
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while (n < max_depth) { |
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if (unw_get_reg(&cursor, UNW_REG_IP, (unw_word_t *) &ip) < 0) { |
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break; |
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} |
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sizes[n] = 0; |
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result[n++] = ip; |
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if (unw_step(&cursor) <= 0) { |
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break; |
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} |
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sp = next_sp; |
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if (unw_get_reg(&cursor, UNW_REG_SP, &next_sp) , 0) { |
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break; |
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} |
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sizes[n - 1] = next_sp - sp; |
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} |
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if (min_dropped_frames != nullptr) { |
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// Implementation detail: we clamp the max of frames we are willing to |
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// count, so as not to spend too much time in the loop below. |
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const int kMaxUnwind = 200; |
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int j = 0; |
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for (; j < kMaxUnwind; j++) { |
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if (unw_step(&cursor) < 0) { |
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break; |
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} |
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} |
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*min_dropped_frames = j; |
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} |
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} else { |
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skip_count++; // Do not include current frame. |
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void **result_all = reinterpret_cast<void**>( |
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alloca(sizeof(void*) * (max_depth + skip_count))); |
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int rc = unw_backtrace(result_all, max_depth + skip_count); |
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if (rc > 0) { |
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// Tell MSan that result_all has been initialized. b/34965936. |
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ANNOTATE_MEMORY_IS_INITIALIZED(result_all, rc * sizeof(void*)); |
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} |
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if (rc > skip_count) { |
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memcpy(result, &result_all[skip_count], |
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sizeof(void*) * (rc - skip_count)); |
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n = rc - skip_count; |
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} else { |
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n = 0; |
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} |
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if (min_dropped_frames != nullptr) { |
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// Not implemented. |
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*min_dropped_frames = 0; |
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} |
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} |
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out: |
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--recursive; |
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return n; |
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} |
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#endif // ABSL_DEBUGGING_INTERNAL_STACKTRACE_LIBUNWIND_INL_H_ |
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