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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
*
* 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.
*/
#ifndef ART_RUNTIME_UTILS_H_
#define ART_RUNTIME_UTILS_H_
#include <pthread.h>
#include <string>
#include <vector>
#include "base/logging.h"
#include "base/stringprintf.h"
#include "globals.h"
#include "primitive.h"
namespace art {
class DexFile;
namespace mirror {
class ArtField;
class ArtMethod;
class Class;
class Object;
class String;
} // namespace mirror
enum TimeUnit {
kTimeUnitNanosecond,
kTimeUnitMicrosecond,
kTimeUnitMillisecond,
kTimeUnitSecond,
};
template<typename T>
static constexpr bool IsPowerOfTwo(T x) {
return (x & (x - 1)) == 0;
}
template<int n, typename T>
static inline bool IsAligned(T x) {
COMPILE_ASSERT((n & (n - 1)) == 0, n_not_power_of_two);
return (x & (n - 1)) == 0;
}
template<int n, typename T>
static inline bool IsAligned(T* x) {
return IsAligned<n>(reinterpret_cast<const uintptr_t>(x));
}
template<typename T>
static inline bool IsAlignedParam(T x, int n) {
return (x & (n - 1)) == 0;
}
#define CHECK_ALIGNED(value, alignment) \
CHECK(::art::IsAligned<alignment>(value)) << reinterpret_cast<const void*>(value)
#define DCHECK_ALIGNED(value, alignment) \
DCHECK(::art::IsAligned<alignment>(value)) << reinterpret_cast<const void*>(value)
#define DCHECK_ALIGNED_PARAM(value, alignment) \
DCHECK(::art::IsAlignedParam(value, alignment)) << reinterpret_cast<const void*>(value)
// Check whether an N-bit two's-complement representation can hold value.
static inline bool IsInt(int N, word value) {
CHECK_LT(0, N);
CHECK_LT(N, kBitsPerWord);
word limit = static_cast<word>(1) << (N - 1);
return (-limit <= value) && (value < limit);
}
static inline bool IsUint(int N, word value) {
CHECK_LT(0, N);
CHECK_LT(N, kBitsPerWord);
word limit = static_cast<word>(1) << N;
return (0 <= value) && (value < limit);
}
static inline bool IsAbsoluteUint(int N, word value) {
CHECK_LT(0, N);
CHECK_LT(N, kBitsPerWord);
if (value < 0) value = -value;
return IsUint(N, value);
}
static inline uint16_t Low16Bits(uint32_t value) {
return static_cast<uint16_t>(value);
}
static inline uint16_t High16Bits(uint32_t value) {
return static_cast<uint16_t>(value >> 16);
}
static inline uint32_t Low32Bits(uint64_t value) {
return static_cast<uint32_t>(value);
}
static inline uint32_t High32Bits(uint64_t value) {
return static_cast<uint32_t>(value >> 32);
}
// A static if which determines whether to return type A or B based on the condition boolean.
template <bool condition, typename A, typename B>
struct TypeStaticIf {
typedef A type;
};
// Specialization to handle the false case.
template <typename A, typename B>
struct TypeStaticIf<false, A, B> {
typedef B type;
};
// Type identity.
template <typename T>
struct TypeIdentity {
typedef T type;
};
// For rounding integers.
template<typename T>
static constexpr T RoundDown(T x, typename TypeIdentity<T>::type n) {
return
// DCHECK(IsPowerOfTwo(n)) in a form acceptable in a constexpr function:
(kIsDebugBuild && !IsPowerOfTwo(n)) ? (LOG(FATAL) << n << " isn't a power of 2", T(0))
: (x & -n);
}
template<typename T>
static constexpr T RoundUp(T x, typename TypeIdentity<T>::type n) {
return RoundDown(x + n - 1, n);
}
// For aligning pointers.
template<typename T>
static inline T* AlignDown(T* x, uintptr_t n) {
return reinterpret_cast<T*>(RoundDown(reinterpret_cast<uintptr_t>(x), n));
}
template<typename T>
static inline T* AlignUp(T* x, uintptr_t n) {
return reinterpret_cast<T*>(RoundUp(reinterpret_cast<uintptr_t>(x), n));
}
// Implementation is from "Hacker's Delight" by Henry S. Warren, Jr.,
// figure 3-3, page 48, where the function is called clp2.
static inline uint32_t RoundUpToPowerOfTwo(uint32_t x) {
x = x - 1;
x = x | (x >> 1);
x = x | (x >> 2);
x = x | (x >> 4);
x = x | (x >> 8);
x = x | (x >> 16);
return x + 1;
}
template<typename T>
static constexpr int CLZ(T x) {
return (sizeof(T) == sizeof(uint32_t))
? __builtin_clz(x)
: __builtin_clzll(x);
}
template<typename T>
static constexpr int CTZ(T x) {
return (sizeof(T) == sizeof(uint32_t))
? __builtin_ctz(x)
: __builtin_ctzll(x);
}
template<typename T>
static constexpr int POPCOUNT(T x) {
return (sizeof(T) == sizeof(uint32_t))
? __builtin_popcount(x)
: __builtin_popcountll(x);
}
static inline uint32_t PointerToLowMemUInt32(const void* p) {
uintptr_t intp = reinterpret_cast<uintptr_t>(p);
DCHECK_LE(intp, 0xFFFFFFFFU);
return intp & 0xFFFFFFFFU;
}
static inline bool NeedsEscaping(uint16_t ch) {
return (ch < ' ' || ch > '~');
}
static inline std::string PrintableChar(uint16_t ch) {
std::string result;
result += '\'';
if (NeedsEscaping(ch)) {
StringAppendF(&result, "\\u%04x", ch);
} else {
result += ch;
}
result += '\'';
return result;
}
// Returns an ASCII string corresponding to the given UTF-8 string.
// Java escapes are used for non-ASCII characters.
std::string PrintableString(const std::string& utf8);
// Tests whether 's' starts with 'prefix'.
bool StartsWith(const std::string& s, const char* prefix);
// Tests whether 's' starts with 'suffix'.
bool EndsWith(const std::string& s, const char* suffix);
// Used to implement PrettyClass, PrettyField, PrettyMethod, and PrettyTypeOf,
// one of which is probably more useful to you.
// Returns a human-readable equivalent of 'descriptor'. So "I" would be "int",
// "[[I" would be "int[][]", "[Ljava/lang/String;" would be
// "java.lang.String[]", and so forth.
std::string PrettyDescriptor(mirror::String* descriptor)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
std::string PrettyDescriptor(const std::string& descriptor);
std::string PrettyDescriptor(Primitive::Type type);
std::string PrettyDescriptor(mirror::Class* klass)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Returns a human-readable signature for 'f'. Something like "a.b.C.f" or
// "int a.b.C.f" (depending on the value of 'with_type').
std::string PrettyField(mirror::ArtField* f, bool with_type = true)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
std::string PrettyField(uint32_t field_idx, const DexFile& dex_file, bool with_type = true);
// Returns a human-readable signature for 'm'. Something like "a.b.C.m" or
// "a.b.C.m(II)V" (depending on the value of 'with_signature').
std::string PrettyMethod(mirror::ArtMethod* m, bool with_signature = true)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
std::string PrettyMethod(uint32_t method_idx, const DexFile& dex_file, bool with_signature = true);
// Returns a human-readable form of the name of the *class* of the given object.
// So given an instance of java.lang.String, the output would
// be "java.lang.String". Given an array of int, the output would be "int[]".
// Given String.class, the output would be "java.lang.Class<java.lang.String>".
std::string PrettyTypeOf(mirror::Object* obj)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Returns a human-readable form of the type at an index in the specified dex file.
// Example outputs: char[], java.lang.String.
std::string PrettyType(uint32_t type_idx, const DexFile& dex_file);
// Returns a human-readable form of the name of the given class.
// Given String.class, the output would be "java.lang.Class<java.lang.String>".
std::string PrettyClass(mirror::Class* c)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Returns a human-readable form of the name of the given class with its class loader.
std::string PrettyClassAndClassLoader(mirror::Class* c)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Returns a human-readable size string such as "1MB".
std::string PrettySize(int64_t size_in_bytes);
// Returns a human-readable time string which prints every nanosecond while trying to limit the
// number of trailing zeros. Prints using the largest human readable unit up to a second.
// e.g. "1ms", "1.000000001s", "1.001us"
std::string PrettyDuration(uint64_t nano_duration);
// Format a nanosecond time to specified units.
std::string FormatDuration(uint64_t nano_duration, TimeUnit time_unit);
// Get the appropriate unit for a nanosecond duration.
TimeUnit GetAppropriateTimeUnit(uint64_t nano_duration);
// Get the divisor to convert from a nanoseconds to a time unit.
uint64_t GetNsToTimeUnitDivisor(TimeUnit time_unit);
// Performs JNI name mangling as described in section 11.3 "Linking Native Methods"
// of the JNI spec.
std::string MangleForJni(const std::string& s);
// Turn "java.lang.String" into "Ljava/lang/String;".
std::string DotToDescriptor(const char* class_name);
// Turn "Ljava/lang/String;" into "java.lang.String".
std::string DescriptorToDot(const char* descriptor);
// Turn "Ljava/lang/String;" into "java/lang/String".
std::string DescriptorToName(const char* descriptor);
// Tests for whether 's' is a valid class name in the three common forms:
bool IsValidBinaryClassName(const char* s); // "java.lang.String"
bool IsValidJniClassName(const char* s); // "java/lang/String"
bool IsValidDescriptor(const char* s); // "Ljava/lang/String;"
// Returns whether the given string is a valid field or method name,
// additionally allowing names that begin with '<' and end with '>'.
bool IsValidMemberName(const char* s);
// Returns the JNI native function name for the non-overloaded method 'm'.
std::string JniShortName(mirror::ArtMethod* m)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
// Returns the JNI native function name for the overloaded method 'm'.
std::string JniLongName(mirror::ArtMethod* m)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
bool ReadFileToString(const std::string& file_name, std::string* result);
// Returns the current date in ISO yyyy-mm-dd hh:mm:ss format.
std::string GetIsoDate();
// Returns the monotonic time since some unspecified starting point in milliseconds.
uint64_t MilliTime();
// Returns the monotonic time since some unspecified starting point in microseconds.
uint64_t MicroTime();
// Returns the monotonic time since some unspecified starting point in nanoseconds.
uint64_t NanoTime();
// Returns the thread-specific CPU-time clock in nanoseconds or -1 if unavailable.
uint64_t ThreadCpuNanoTime();
// Converts the given number of nanoseconds to milliseconds.
static constexpr inline uint64_t NsToMs(uint64_t ns) {
return ns / 1000 / 1000;
}
// Converts the given number of milliseconds to nanoseconds
static constexpr inline uint64_t MsToNs(uint64_t ns) {
return ns * 1000 * 1000;
}
#if defined(__APPLE__)
// No clocks to specify on OS/X, fake value to pass to routines that require a clock.
#define CLOCK_REALTIME 0xebadf00d
#endif
// Sleep for the given number of nanoseconds, a bad way to handle contention.
void NanoSleep(uint64_t ns);
// Initialize a timespec to either an absolute or relative time.
void InitTimeSpec(bool absolute, int clock, int64_t ms, int32_t ns, timespec* ts);
// Splits a string using the given separator character into a vector of
// strings. Empty strings will be omitted.
void Split(const std::string& s, char separator, std::vector<std::string>& result);
// Trims whitespace off both ends of the given string.
std::string Trim(std::string s);
// Joins a vector of strings into a single string, using the given separator.
template <typename StringT> std::string Join(std::vector<StringT>& strings, char separator);
// Returns the calling thread's tid. (The C libraries don't expose this.)
pid_t GetTid();
// Returns the given thread's name.
std::string GetThreadName(pid_t tid);
// Returns details of the given thread's stack.
void GetThreadStack(pthread_t thread, void** stack_base, size_t* stack_size);
// Reads data from "/proc/self/task/${tid}/stat".
void GetTaskStats(pid_t tid, char* state, int* utime, int* stime, int* task_cpu);
// Returns the name of the scheduler group for the given thread the current process, or the empty string.
std::string GetSchedulerGroupName(pid_t tid);
// Sets the name of the current thread. The name may be truncated to an
// implementation-defined limit.
void SetThreadName(const char* thread_name);
// Dumps the native stack for thread 'tid' to 'os'.
void DumpNativeStack(std::ostream& os, pid_t tid, const char* prefix = "",
mirror::ArtMethod* current_method = nullptr)
NO_THREAD_SAFETY_ANALYSIS;
// Dumps the kernel stack for thread 'tid' to 'os'. Note that this is only available on linux-x86.
void DumpKernelStack(std::ostream& os, pid_t tid, const char* prefix = "", bool include_count = true);
// Find $ANDROID_ROOT, /system, or abort.
const char* GetAndroidRoot();
// Find $ANDROID_DATA, /data, or abort.
const char* GetAndroidData();
// Returns the dalvik-cache location, or dies trying. subdir will be
// appended to the cache location.
std::string GetDalvikCacheOrDie(const char* subdir, bool create_if_absent = true);
// Returns the absolute dalvik-cache path for a DexFile or OatFile, or
// dies trying. The path returned will be rooted at cache_location.
std::string GetDalvikCacheFilenameOrDie(const char* file_location,
const char* cache_location);
// Check whether the given magic matches a known file type.
bool IsZipMagic(uint32_t magic);
bool IsDexMagic(uint32_t magic);
bool IsOatMagic(uint32_t magic);
// Wrapper on fork/execv to run a command in a subprocess.
bool Exec(std::vector<std::string>& arg_vector, std::string* error_msg);
class VoidFunctor {
public:
template <typename A>
inline void operator() (A a) const {
UNUSED(a);
}
template <typename A, typename B>
inline void operator() (A a, B b) const {
UNUSED(a);
UNUSED(b);
}
template <typename A, typename B, typename C>
inline void operator() (A a, B b, C c) const {
UNUSED(a);
UNUSED(b);
UNUSED(c);
}
};
} // namespace art
#endif // ART_RUNTIME_UTILS_H_