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/*
* Copyright 2006 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
// Most of this was borrowed (with minor modifications) from V8's and Chromium's
// src/base/logging.cc.
#include <cstdarg>
#include <cstdio>
#include <cstdlib>
#include "absl/strings/string_view.h"
#if defined(WEBRTC_ANDROID)
#define RTC_LOG_TAG_ANDROID "rtc"
#include <android/log.h> // NOLINT
#endif
#if defined(WEBRTC_WIN)
#include <windows.h>
#endif
#if defined(WEBRTC_WIN)
#define LAST_SYSTEM_ERROR (::GetLastError())
#elif defined(__native_client__) && __native_client__
#define LAST_SYSTEM_ERROR (0)
#elif defined(WEBRTC_POSIX)
#include <errno.h>
#define LAST_SYSTEM_ERROR (errno)
#endif // WEBRTC_WIN
#include "rtc_base/checks.h"
namespace {
#if defined(__GNUC__)
__attribute__((__format__(__printf__, 2, 3)))
#endif
void AppendFormat(std::string* s, const char* fmt, ...) {
va_list args, copy;
va_start(args, fmt);
va_copy(copy, args);
const int predicted_length = std::vsnprintf(nullptr, 0, fmt, copy);
va_end(copy);
if (predicted_length > 0) {
const size_t size = s->size();
s->resize(size + predicted_length);
// Pass "+ 1" to vsnprintf to include space for the '\0'.
std::vsnprintf(&((*s)[size]), predicted_length + 1, fmt, args);
}
va_end(args);
}
} // namespace
namespace rtc {
namespace webrtc_checks_impl {
#if !defined(WEBRTC_CHROMIUM_BUILD)
RTC_NORETURN void WriteFatalLog(absl::string_view output) {
#if defined(WEBRTC_ANDROID)
std::string output_str(output);
__android_log_print(ANDROID_LOG_ERROR, RTC_LOG_TAG_ANDROID, "%s\n",
output_str.c_str());
#endif
fflush(stdout);
fwrite(output.data(), output.size(), 1, stderr);
fflush(stderr);
#if defined(WEBRTC_WIN)
DebugBreak();
#endif
abort();
}
RTC_NORETURN void WriteFatalLog(const char* file,
int line,
absl::string_view output) {
WriteFatalLog(output);
}
#endif // !defined(WEBRTC_CHROMIUM_BUILD)
#if RTC_CHECK_MSG_ENABLED
// Reads one argument from args, appends it to s and advances fmt.
// Returns true iff an argument was sucessfully parsed.
bool ParseArg(va_list* args, const CheckArgType** fmt, std::string* s) {
if (**fmt == CheckArgType::kEnd)
return false;
switch (**fmt) {
case CheckArgType::kInt:
AppendFormat(s, "%d", va_arg(*args, int));
break;
case CheckArgType::kLong:
AppendFormat(s, "%ld", va_arg(*args, long));
break;
case CheckArgType::kLongLong:
AppendFormat(s, "%lld", va_arg(*args, long long));
break;
case CheckArgType::kUInt:
AppendFormat(s, "%u", va_arg(*args, unsigned));
break;
case CheckArgType::kULong:
AppendFormat(s, "%lu", va_arg(*args, unsigned long));
break;
case CheckArgType::kULongLong:
AppendFormat(s, "%llu", va_arg(*args, unsigned long long));
break;
case CheckArgType::kDouble:
AppendFormat(s, "%g", va_arg(*args, double));
break;
case CheckArgType::kLongDouble:
AppendFormat(s, "%Lg", va_arg(*args, long double));
break;
case CheckArgType::kCharP:
s->append(va_arg(*args, const char*));
break;
case CheckArgType::kStdString:
s->append(*va_arg(*args, const std::string*));
break;
case CheckArgType::kStringView: {
const absl::string_view sv = *va_arg(*args, const absl::string_view*);
s->append(sv.data(), sv.size());
break;
}
case CheckArgType::kVoidP:
AppendFormat(s, "%p", va_arg(*args, const void*));
break;
default:
s->append("[Invalid CheckArgType]");
return false;
}
(*fmt)++;
return true;
}
RTC_NORETURN void FatalLog(const char* file,
int line,
const char* message,
const CheckArgType* fmt,
...) {
va_list args;
va_start(args, fmt);
std::string s;
AppendFormat(&s,
"\n\n"
"#\n"
"# Fatal error in: %s, line %d\n"
"# last system error: %u\n"
"# Check failed: %s",
file, line, LAST_SYSTEM_ERROR, message);
if (*fmt == CheckArgType::kCheckOp) {
// This log message was generated by RTC_CHECK_OP, so we have to complete
// the error message using the operands that have been passed as the first
// two arguments.
fmt++;
std::string s1, s2;
if (ParseArg(&args, &fmt, &s1) && ParseArg(&args, &fmt, &s2))
AppendFormat(&s, " (%s vs. %s)\n# ", s1.c_str(), s2.c_str());
} else {
s.append("\n# ");
}
// Append all the user-supplied arguments to the message.
while (ParseArg(&args, &fmt, &s))
;
va_end(args);
WriteFatalLog(file, line, s);
}
#else // RTC_CHECK_MSG_ENABLED
RTC_NORETURN void FatalLog(const char* file, int line) {
std::string s;
AppendFormat(&s,
"\n\n"
"#\n"
"# Fatal error in: %s, line %d\n"
"# last system error: %u\n"
"# Check failed.\n"
"# ",
file, line, LAST_SYSTEM_ERROR);
WriteFatalLog(file, line, s);
}
#endif // RTC_CHECK_MSG_ENABLED
#if RTC_DCHECK_IS_ON
RTC_NORETURN void UnreachableCodeReached(const char* file, int line) {
std::string s;
AppendFormat(&s,
"\n\n"
"#\n"
"# Unreachable code reached: %s, line %d\n"
"# last system error: %u\n"
"# ",
file, line, LAST_SYSTEM_ERROR);
WriteFatalLog(file, line, s);
}
#else // !RTC_DCHECK_IS_ON
RTC_NORETURN void UnreachableCodeReached() {
std::string s;
AppendFormat(&s,
"\n\n"
"#\n"
"# Unreachable code reached (file and line unknown)\n"
"# last system error: %u\n"
"# ",
LAST_SYSTEM_ERROR);
WriteFatalLog(s);
}
#endif // !RTC_DCHECK_IS_ON
} // namespace webrtc_checks_impl
} // namespace rtc
// Function to call from the C version of the RTC_CHECK and RTC_DCHECK macros.
RTC_NORETURN void rtc_FatalMessage(const char* file,
int line,
const char* msg) {
#if RTC_CHECK_MSG_ENABLED
static constexpr rtc::webrtc_checks_impl::CheckArgType t[] = {
rtc::webrtc_checks_impl::CheckArgType::kEnd};
rtc::webrtc_checks_impl::FatalLog(file, line, msg, t);
#else
rtc::webrtc_checks_impl::FatalLog(file, line);
#endif
}
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