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* Copyright (C) 2011 The Android Open Source Project
* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <ostream>
#include "base/macros.h"
namespace art {
enum LogSeverity {
NONE, // Fake level, don't log at all.
INTERNAL_FATAL, // For Runtime::Abort.
// The members of this struct are the valid arguments to VLOG and VLOG_IS_ON in code,
// and the "-verbose:" command line argument.
struct LogVerbosity {
bool class_linker; // Enabled with "-verbose:class".
bool collector;
bool compiler;
bool deopt;
bool gc;
bool heap;
bool jdwp;
bool jit;
bool jni;
bool monitor;
bool oat;
bool profiler;
bool signals;
bool simulator;
bool startup;
bool third_party_jni; // Enabled with "-verbose:third-party-jni".
bool threads;
bool verifier;
bool image;
// Global log verbosity setting, initialized by InitLogging.
extern LogVerbosity gLogVerbosity;
// 0 if not abort, non-zero if an abort is in progress. Used on fatal exit to prevents recursive
// aborts. Global declaration allows us to disable some error checking to ensure fatal shutdown
// makes forward progress.
extern unsigned int gAborting;
// Configure logging based on ANDROID_LOG_TAGS environment variable.
// We need to parse a string that looks like
// *:v jdwp:d dalvikvm:d dalvikvm-gc:i dalvikvmi:i
// The tag (or '*' for the global level) comes first, followed by a colon
// and a letter indicating the minimum priority level we're expected to log.
// This can be used to reveal or conceal logs with specific tags.
extern void InitLogging(char* argv[]);
// Returns the command line used to invoke the current tool or null if InitLogging hasn't been
// performed.
extern const char* GetCmdLine();
// The command used to start the ART runtime, such as "/system/bin/dalvikvm". If InitLogging hasn't
// been performed then just returns "art"
extern const char* ProgramInvocationName();
// A short version of the command used to start the ART runtime, such as "dalvikvm". If InitLogging
// hasn't been performed then just returns "art"
extern const char* ProgramInvocationShortName();
// Logs a message to logcat on Android otherwise to stderr. If the severity is FATAL it also causes
// an abort. For example: LOG(FATAL) << "We didn't expect to reach here";
#define LOG(severity) ::art::LogMessage(__FILE__, __LINE__, severity, -1).stream()
// A variant of LOG that also logs the current errno value. To be used when library calls fail.
#define PLOG(severity) ::art::LogMessage(__FILE__, __LINE__, severity, errno).stream()
// Marker that code is yet to be implemented.
#define UNIMPLEMENTED(level) LOG(level) << __PRETTY_FUNCTION__ << " unimplemented "
// Is verbose logging enabled for the given module? Where the module is defined in LogVerbosity.
#define VLOG_IS_ON(module) UNLIKELY(::art::gLogVerbosity.module)
// Variant of LOG that logs when verbose logging is enabled for a module. For example,
// VLOG(jni) << "A JNI operation was performed";
#define VLOG(module) \
if (VLOG_IS_ON(module)) \
::art::LogMessage(__FILE__, __LINE__, INFO, -1).stream()
// Return the stream associated with logging for the given module.
#define VLOG_STREAM(module) ::art::LogMessage(__FILE__, __LINE__, INFO, -1).stream()
// Check whether condition x holds and LOG(FATAL) if not. The value of the expression x is only
// evaluated once. Extra logging can be appended using << after. For example,
// CHECK(false == true) results in a log message of "Check failed: false == true".
#define CHECK(x) \
if (UNLIKELY(!(x))) \
::art::LogMessage(__FILE__, __LINE__, ::art::FATAL, -1).stream() \
<< "Check failed: " #x << " "
// Helper for CHECK_xx(x,y) macros.
#define CHECK_OP(LHS, RHS, OP) \
for (auto _values = ::art::MakeEagerEvaluator(LHS, RHS); \
UNLIKELY(!(_values.lhs OP _values.rhs)); /* empty */) \
::art::LogMessage(__FILE__, __LINE__, ::art::FATAL, -1).stream() \
<< "Check failed: " << #LHS << " " << #OP << " " << #RHS \
<< " (" #LHS "=" << _values.lhs << ", " #RHS "=" << _values.rhs << ") "
// Check whether a condition holds between x and y, LOG(FATAL) if not. The value of the expressions
// x and y is evaluated once. Extra logging can be appended using << after. For example,
// CHECK_NE(0 == 1, false) results in "Check failed: false != false (0==1=false, false=false) ".
#define CHECK_EQ(x, y) CHECK_OP(x, y, ==)
#define CHECK_NE(x, y) CHECK_OP(x, y, !=)
#define CHECK_LE(x, y) CHECK_OP(x, y, <=)
#define CHECK_LT(x, y) CHECK_OP(x, y, <)
#define CHECK_GE(x, y) CHECK_OP(x, y, >=)
#define CHECK_GT(x, y) CHECK_OP(x, y, >)
// Helper for CHECK_STRxx(s1,s2) macros.
#define CHECK_STROP(s1, s2, sense) \
if (UNLIKELY((strcmp(s1, s2) == 0) != sense)) \
LOG(::art::FATAL) << "Check failed: " \
<< "\"" << s1 << "\"" \
<< (sense ? " == " : " != ") \
<< "\"" << s2 << "\""
// Check for string (const char*) equality between s1 and s2, LOG(FATAL) if not.
#define CHECK_STREQ(s1, s2) CHECK_STROP(s1, s2, true)
#define CHECK_STRNE(s1, s2) CHECK_STROP(s1, s2, false)
// Perform the pthread function call(args), LOG(FATAL) on error.
#define CHECK_PTHREAD_CALL(call, args, what) \
do { \
int rc = call args; \
if (rc != 0) { \
errno = rc; \
PLOG(::art::FATAL) << # call << " failed for " << what; \
} \
} while (false)
// CHECK that can be used in a constexpr function. For example,
// constexpr int half(int n) {
// return
// DCHECK_CONSTEXPR(n >= 0, , 0)
// CHECK_CONSTEXPR((n & 1) == 0), << "Extra debugging output: n = " << n, 0)
// n / 2;
// }
#define CHECK_CONSTEXPR(x, out, dummy) \
(UNLIKELY(!(x))) ? (LOG(::art::FATAL) << "Check failed: " << #x out, dummy) :
// DCHECKs are debug variants of CHECKs only enabled in debug builds. Generally CHECK should be
// used unless profiling identifies a CHECK as being in performance critical code.
#if defined(NDEBUG)
static constexpr bool kEnableDChecks = false;
static constexpr bool kEnableDChecks = true;
#define DCHECK(x) if (::art::kEnableDChecks) CHECK(x)
#define DCHECK_EQ(x, y) if (::art::kEnableDChecks) CHECK_EQ(x, y)
#define DCHECK_NE(x, y) if (::art::kEnableDChecks) CHECK_NE(x, y)
#define DCHECK_LE(x, y) if (::art::kEnableDChecks) CHECK_LE(x, y)
#define DCHECK_LT(x, y) if (::art::kEnableDChecks) CHECK_LT(x, y)
#define DCHECK_GE(x, y) if (::art::kEnableDChecks) CHECK_GE(x, y)
#define DCHECK_GT(x, y) if (::art::kEnableDChecks) CHECK_GT(x, y)
#define DCHECK_STREQ(s1, s2) if (::art::kEnableDChecks) CHECK_STREQ(s1, s2)
#define DCHECK_STRNE(s1, s2) if (::art::kEnableDChecks) CHECK_STRNE(s1, s2)
#if defined(NDEBUG)
#define DCHECK_CONSTEXPR(x, out, dummy)
#define DCHECK_CONSTEXPR(x, out, dummy) CHECK_CONSTEXPR(x, out, dummy)
// Temporary class created to evaluate the LHS and RHS, used with MakeEagerEvaluator to infer the
// types of LHS and RHS.
template <typename LHS, typename RHS>
struct EagerEvaluator {
EagerEvaluator(LHS l, RHS r) : lhs(l), rhs(r) { }
LHS lhs;
RHS rhs;
// Helper function for CHECK_xx.
template <typename LHS, typename RHS>
static inline EagerEvaluator<LHS, RHS> MakeEagerEvaluator(LHS lhs, RHS rhs) {
return EagerEvaluator<LHS, RHS>(lhs, rhs);
// Explicitly instantiate EagerEvalue for pointers so that char*s aren't treated as strings. To
// compare strings use CHECK_STREQ and CHECK_STRNE. We rely on signed/unsigned warnings to
// protect you against combinations not explicitly listed below.
template <> struct EagerEvaluator<T1, T2> { \
EagerEvaluator(T1 l, T2 r) \
: lhs(reinterpret_cast<const void*>(l)), \
rhs(reinterpret_cast<const void*>(r)) { } \
const void* lhs; \
const void* rhs; \
EAGER_PTR_EVALUATOR(const char*, const char*);
EAGER_PTR_EVALUATOR(const char*, char*);
EAGER_PTR_EVALUATOR(char*, const char*);
EAGER_PTR_EVALUATOR(char*, char*);
EAGER_PTR_EVALUATOR(const unsigned char*, const unsigned char*);
EAGER_PTR_EVALUATOR(const unsigned char*, unsigned char*);
EAGER_PTR_EVALUATOR(unsigned char*, const unsigned char*);
EAGER_PTR_EVALUATOR(unsigned char*, unsigned char*);
EAGER_PTR_EVALUATOR(const signed char*, const signed char*);
EAGER_PTR_EVALUATOR(const signed char*, signed char*);
EAGER_PTR_EVALUATOR(signed char*, const signed char*);
EAGER_PTR_EVALUATOR(signed char*, signed char*);
// Data for the log message, not stored in LogMessage to avoid increasing the stack size.
class LogMessageData;
// A LogMessage is a temporarily scoped object used by LOG and the unlikely part of a CHECK. The
// destructor will abort if the severity is FATAL.
class LogMessage {
LogMessage(const char* file, unsigned int line, LogSeverity severity, int error);
~LogMessage(); // TODO: enable REQUIRES(!Locks::logging_lock_).
// Returns the stream associated with the message, the LogMessage performs output when it goes
// out of scope.
std::ostream& stream();
// The routine that performs the actual logging.
static void LogLine(const char* file, unsigned int line, LogSeverity severity, const char* msg);
// A variant of the above for use with little stack.
static void LogLineLowStack(const char* file, unsigned int line, LogSeverity severity,
const char* msg);
const std::unique_ptr<LogMessageData> data_;
// Allows to temporarily change the minimum severity level for logging.
class ScopedLogSeverity {
explicit ScopedLogSeverity(LogSeverity level);
LogSeverity old_;
} // namespace art