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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