8f2828c4b4
ccdbb5941 Export of internal Abseil changes 01f5f81f9 Export of internal Abseil changes 2c92bdc7c Export of internal Abseil changes e7ebf9803 Export of internal Abseil changes 2eba343b5 Export of internal Abseil changes a8b03d90e Export of internal Abseil changes 1d31b5c36 Export of internal Abseil changes da3a87690 Export of internal Abseil changes 8faf20461 Exclude empty directories (#697) 2069dc796 Export of internal Abseil changes 4832bf6bf Added a BUILD file in root to expose license. (#695) af8f994af Export of internal Abseil changes 33caf1097 Export of internal Abseil changes cf1a02e2d Export of internal Abseil changes git-subtree-dir: third_party/abseil_cpp git-subtree-split: ccdbb5941f992fabda7eae3ce72f55efc17c826a
187 lines
6.7 KiB
C++
187 lines
6.7 KiB
C++
//
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// Copyright 2018 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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// https://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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#include "absl/debugging/internal/examine_stack.h"
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#ifndef _WIN32
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#include <unistd.h>
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#endif
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#ifdef __APPLE__
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#include <sys/ucontext.h>
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#endif
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#include <csignal>
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#include <cstdio>
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#include "absl/base/attributes.h"
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#include "absl/base/internal/raw_logging.h"
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#include "absl/base/macros.h"
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#include "absl/debugging/stacktrace.h"
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#include "absl/debugging/symbolize.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace debugging_internal {
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// Returns the program counter from signal context, nullptr if
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// unknown. vuc is a ucontext_t*. We use void* to avoid the use of
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// ucontext_t on non-POSIX systems.
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void* GetProgramCounter(void* vuc) {
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#ifdef __linux__
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if (vuc != nullptr) {
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ucontext_t* context = reinterpret_cast<ucontext_t*>(vuc);
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#if defined(__aarch64__)
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return reinterpret_cast<void*>(context->uc_mcontext.pc);
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#elif defined(__arm__)
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return reinterpret_cast<void*>(context->uc_mcontext.arm_pc);
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#elif defined(__i386__)
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if (14 < ABSL_ARRAYSIZE(context->uc_mcontext.gregs))
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return reinterpret_cast<void*>(context->uc_mcontext.gregs[14]);
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#elif defined(__mips__)
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return reinterpret_cast<void*>(context->uc_mcontext.pc);
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#elif defined(__powerpc64__)
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return reinterpret_cast<void*>(context->uc_mcontext.gp_regs[32]);
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#elif defined(__powerpc__)
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return reinterpret_cast<void*>(context->uc_mcontext.regs->nip);
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#elif defined(__riscv)
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return reinterpret_cast<void*>(context->uc_mcontext.__gregs[REG_PC]);
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#elif defined(__s390__) && !defined(__s390x__)
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return reinterpret_cast<void*>(context->uc_mcontext.psw.addr & 0x7fffffff);
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#elif defined(__s390__) && defined(__s390x__)
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return reinterpret_cast<void*>(context->uc_mcontext.psw.addr);
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#elif defined(__x86_64__)
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if (16 < ABSL_ARRAYSIZE(context->uc_mcontext.gregs))
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return reinterpret_cast<void*>(context->uc_mcontext.gregs[16]);
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#else
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#error "Undefined Architecture."
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#endif
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}
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#elif defined(__APPLE__)
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if (vuc != nullptr) {
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ucontext_t* signal_ucontext = reinterpret_cast<ucontext_t*>(vuc);
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#if defined(__aarch64__)
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return reinterpret_cast<void*>(
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__darwin_arm_thread_state64_get_pc(signal_ucontext->uc_mcontext->__ss));
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#elif defined(__arm__)
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#if __DARWIN_UNIX03
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return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->__ss.__pc);
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#else
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return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->ss.pc);
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#endif
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#elif defined(__i386__)
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#if __DARWIN_UNIX03
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return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->__ss.__eip);
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#else
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return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->ss.eip);
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#endif
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#elif defined(__x86_64__)
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#if __DARWIN_UNIX03
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return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->__ss.__rip);
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#else
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return reinterpret_cast<void*>(signal_ucontext->uc_mcontext->ss.rip);
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#endif
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#endif
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}
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#elif defined(__akaros__)
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auto* ctx = reinterpret_cast<struct user_context*>(vuc);
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return reinterpret_cast<void*>(get_user_ctx_pc(ctx));
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#endif
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static_cast<void>(vuc);
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return nullptr;
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}
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// The %p field width for printf() functions is two characters per byte,
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// and two extra for the leading "0x".
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static constexpr int kPrintfPointerFieldWidth = 2 + 2 * sizeof(void*);
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// Print a program counter, its stack frame size, and its symbol name.
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// Note that there is a separate symbolize_pc argument. Return addresses may be
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// at the end of the function, and this allows the caller to back up from pc if
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// appropriate.
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static void DumpPCAndFrameSizeAndSymbol(void (*writerfn)(const char*, void*),
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void* writerfn_arg, void* pc,
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void* symbolize_pc, int framesize,
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const char* const prefix) {
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char tmp[1024];
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const char* symbol = "(unknown)";
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if (absl::Symbolize(symbolize_pc, tmp, sizeof(tmp))) {
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symbol = tmp;
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}
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char buf[1024];
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if (framesize <= 0) {
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snprintf(buf, sizeof(buf), "%s@ %*p (unknown) %s\n", prefix,
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kPrintfPointerFieldWidth, pc, symbol);
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} else {
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snprintf(buf, sizeof(buf), "%s@ %*p %9d %s\n", prefix,
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kPrintfPointerFieldWidth, pc, framesize, symbol);
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}
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writerfn(buf, writerfn_arg);
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}
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// Print a program counter and the corresponding stack frame size.
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static void DumpPCAndFrameSize(void (*writerfn)(const char*, void*),
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void* writerfn_arg, void* pc, int framesize,
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const char* const prefix) {
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char buf[100];
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if (framesize <= 0) {
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snprintf(buf, sizeof(buf), "%s@ %*p (unknown)\n", prefix,
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kPrintfPointerFieldWidth, pc);
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} else {
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snprintf(buf, sizeof(buf), "%s@ %*p %9d\n", prefix,
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kPrintfPointerFieldWidth, pc, framesize);
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}
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writerfn(buf, writerfn_arg);
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}
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void DumpPCAndFrameSizesAndStackTrace(
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void* pc, void* const stack[], int frame_sizes[], int depth,
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int min_dropped_frames, bool symbolize_stacktrace,
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void (*writerfn)(const char*, void*), void* writerfn_arg) {
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if (pc != nullptr) {
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// We don't know the stack frame size for PC, use 0.
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if (symbolize_stacktrace) {
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DumpPCAndFrameSizeAndSymbol(writerfn, writerfn_arg, pc, pc, 0, "PC: ");
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} else {
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DumpPCAndFrameSize(writerfn, writerfn_arg, pc, 0, "PC: ");
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}
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}
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for (int i = 0; i < depth; i++) {
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if (symbolize_stacktrace) {
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// Pass the previous address of pc as the symbol address because pc is a
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// return address, and an overrun may occur when the function ends with a
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// call to a function annotated noreturn (e.g. CHECK). Note that we don't
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// do this for pc above, as the adjustment is only correct for return
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// addresses.
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DumpPCAndFrameSizeAndSymbol(writerfn, writerfn_arg, stack[i],
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reinterpret_cast<char*>(stack[i]) - 1,
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frame_sizes[i], " ");
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} else {
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DumpPCAndFrameSize(writerfn, writerfn_arg, stack[i], frame_sizes[i],
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" ");
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}
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}
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if (min_dropped_frames > 0) {
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char buf[100];
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snprintf(buf, sizeof(buf), " @ ... and at least %d more frames\n",
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min_dropped_frames);
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writerfn(buf, writerfn_arg);
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}
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}
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} // namespace debugging_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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