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// Copyright 2018 The SwiftShader Authors. All Rights Reserved.
//
// 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 "Debug.hpp"
#include <atomic>
#include <cstdarg>
#include <cstdio>
#include <string>
#if __ANDROID__
# include <android/log.h>
#endif
#if defined(__unix__)
# define PTRACE
# include <sys/ptrace.h>
# include <sys/types.h>
#elif defined(_WIN32) || defined(_WIN64)
# include <windows.h>
#elif defined(__APPLE__) || defined(__MACH__)
# include <sys/sysctl.h>
# include <unistd.h>
#endif
#ifdef ERROR
# undef ERROR // b/127920555
#endif
#ifndef REACTOR_LOGGING_LEVEL
# define REACTOR_LOGGING_LEVEL Info
#endif
namespace {
bool IsUnderDebugger()
{
#if defined(PTRACE) && !defined(__APPLE__) && !defined(__MACH__)
static bool checked = false;
static bool res = false;
if(!checked)
{
// If a debugger is attached then we're already being ptraced and ptrace
// will return a non-zero value.
checked = true;
if(ptrace(PTRACE_TRACEME, 0, 1, 0) != 0)
{
res = true;
}
else
{
ptrace(PTRACE_DETACH, 0, 1, 0);
}
}
return res;
#elif defined(_WIN32) || defined(_WIN64)
return IsDebuggerPresent() != 0;
#elif defined(__APPLE__) || defined(__MACH__)
// Code comes from the Apple Technical Q&A QA1361
// Tell sysctl what info we're requestion. Specifically we're asking for
// info about this our PID.
int res = 0;
int request[4] = {
CTL_KERN,
KERN_PROC,
KERN_PROC_PID,
getpid()
};
struct kinfo_proc info;
size_t size = sizeof(info);
info.kp_proc.p_flag = 0;
// Get the info we're requesting, if sysctl fails then info.kp_proc.p_flag will remain 0.
res = sysctl(request, sizeof(request) / sizeof(*request), &info, &size, NULL, 0);
ASSERT_MSG(res == 0, "syscl returned %d", res);
// We're being debugged if the P_TRACED flag is set
return ((info.kp_proc.p_flag & P_TRACED) != 0);
#else
return false;
#endif
}
enum class Level
{
Debug,
Info,
Warn,
Error,
Fatal,
};
#ifdef __ANDROID__
void logv_android(Level level, const char *msg)
{
switch(level)
{
case Level::Debug:
__android_log_write(ANDROID_LOG_DEBUG, "SwiftShader", msg);
break;
case Level::Info:
__android_log_write(ANDROID_LOG_INFO, "SwiftShader", msg);
break;
case Level::Warn:
__android_log_write(ANDROID_LOG_WARN, "SwiftShader", msg);
break;
case Level::Error:
__android_log_write(ANDROID_LOG_ERROR, "SwiftShader", msg);
break;
case Level::Fatal:
__android_log_write(ANDROID_LOG_FATAL, "SwiftShader", msg);
break;
}
}
#else
void logv_std(Level level, const char *msg)
{
switch(level)
{
case Level::Debug:
case Level::Info:
fprintf(stdout, "%s", msg);
break;
case Level::Warn:
case Level::Error:
case Level::Fatal:
fprintf(stderr, "%s", msg);
break;
}
}
#endif
void logv(Level level, const char *format, va_list args)
{
if(static_cast<int>(level) < static_cast<int>(Level::REACTOR_LOGGING_LEVEL))
{
return;
}
#ifndef SWIFTSHADER_DISABLE_TRACE
char buffer[2048];
vsnprintf(buffer, sizeof(buffer), format, args);
# if defined(__ANDROID__)
logv_android(level, buffer);
# elif defined(_WIN32)
logv_std(level, buffer);
::OutputDebugString(buffer);
# else
logv_std(level, buffer);
# endif
const bool traceToFile = false;
if(traceToFile)
{
FILE *file = fopen(TRACE_OUTPUT_FILE, "a");
if(file)
{
vfprintf(file, format, args);
fclose(file);
}
}
#endif // SWIFTSHADER_DISABLE_TRACE
}
} // anonymous namespace
namespace rr {
void trace(const char *format, ...)
{
va_list vararg;
va_start(vararg, format);
logv(Level::Debug, format, vararg);
va_end(vararg);
}
void warn(const char *format, ...)
{
va_list vararg;
va_start(vararg, format);
logv(Level::Warn, format, vararg);
va_end(vararg);
}
void abort(const char *format, ...)
{
va_list vararg;
va_start(vararg, format);
logv(Level::Fatal, format, vararg);
va_end(vararg);
::abort();
}
void trace_assert(const char *format, ...)
{
static std::atomic<bool> asserted = { false };
if(IsUnderDebugger() && !asserted.exchange(true))
{
// Abort after tracing and printing to stderr
va_list vararg;
va_start(vararg, format);
logv(Level::Fatal, format, vararg);
va_end(vararg);
::abort();
}
else if(!asserted)
{
va_list vararg;
va_start(vararg, format);
logv(Level::Fatal, format, vararg);
va_end(vararg);
}
}
} // namespace rr
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