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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Slightly adapted for inclusion in V8.
// Copyright 2016 the V8 project authors. All rights reserved.
#include "src/base/debug/stack_trace.h"
#include <signal.h>
#include <stddef.h>
#include <string.h>
#include <unwind.h>
#include <src/base/platform/platform.h>
#include <iomanip>
#include <ostream>
namespace {
struct StackCrawlState {
StackCrawlState(uintptr_t* frames, size_t max_depth)
: frames(frames),
frame_count(0),
max_depth(max_depth),
have_skipped_self(false) {}
uintptr_t* frames;
size_t frame_count;
size_t max_depth;
bool have_skipped_self;
};
_Unwind_Reason_Code TraceStackFrame(_Unwind_Context* context, void* arg) {
StackCrawlState* state = static_cast<StackCrawlState*>(arg);
uintptr_t ip = _Unwind_GetIP(context);
// The first stack frame is this function itself. Skip it.
if (ip != 0 && !state->have_skipped_self) {
state->have_skipped_self = true;
return _URC_NO_REASON;
}
state->frames[state->frame_count++] = ip;
if (state->frame_count >= state->max_depth)
return _URC_END_OF_STACK;
return _URC_NO_REASON;
}
} // namespace
namespace v8 {
namespace base {
namespace debug {
bool EnableInProcessStackDumping() {
// When running in an application, our code typically expects SIGPIPE
// to be ignored. Therefore, when testing that same code, it should run
// with SIGPIPE ignored as well.
// TODO(phajdan.jr): De-duplicate this SIGPIPE code.
struct sigaction action;
memset(&action, 0, sizeof(action));
action.sa_handler = SIG_IGN;
sigemptyset(&action.sa_mask);
return (sigaction(SIGPIPE, &action, nullptr) == 0);
}
void DisableSignalStackDump() {
}
StackTrace::StackTrace() {
StackCrawlState state(reinterpret_cast<uintptr_t*>(trace_), kMaxTraces);
_Unwind_Backtrace(&TraceStackFrame, &state);
count_ = state.frame_count;
}
void StackTrace::Print() const {
std::string backtrace = ToString();
OS::Print("%s\n", backtrace.c_str());
}
void StackTrace::OutputToStream(std::ostream* os) const {
for (size_t i = 0; i < count_; ++i) {
*os << "#" << std::setw(2) << i << trace_[i] << "\n";
}
}
} // namespace debug
} // namespace base
} // namespace v8