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// Copyright 2022 The Tint 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
//
// http://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.
#include "src/tint/utils/debug/debugger.h"
#ifdef TINT_ENABLE_BREAK_IN_DEBUGGER
#ifdef _MSC_VER
#include <Windows.h>
#elif defined(__linux__)
#include <signal.h>
#include <fstream>
#include <string>
#endif
#ifdef _MSC_VER
#define TINT_DEBUGGER_BREAK_DEFINED
void tint::debugger::Break() {
if (::IsDebuggerPresent()) {
::DebugBreak();
}
}
#elif defined(__linux__)
#define TINT_DEBUGGER_BREAK_DEFINED
void tint::debugger::Break() {
// A process is being traced (debugged) if "/proc/self/status" contains a
// line with "TracerPid: <non-zero-digit>...".
bool is_traced = false;
std::ifstream fin("/proc/self/status");
std::string line;
while (!is_traced && std::getline(fin, line)) {
const char kPrefix[] = "TracerPid:\t";
static constexpr int kPrefixLen = sizeof(kPrefix) - 1;
if (line.length() > kPrefixLen && line.compare(0, kPrefixLen, kPrefix) == 0) {
is_traced = line[kPrefixLen] != '0';
}
}
if (is_traced) {
raise(SIGTRAP);
}
}
#endif // platform
#endif // TINT_ENABLE_BREAK_IN_DEBUGGER
#ifndef TINT_DEBUGGER_BREAK_DEFINED
void tint::debugger::Break() {}
#endif