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/*
* Copyright (C) 2007 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 ANDROID_CALLSTACK_H
#define ANDROID_CALLSTACK_H
#include <memory>
#include <android/log.h>
#include <utils/String8.h>
#include <utils/Vector.h>
#include <stdint.h>
#include <sys/types.h>
#if !defined(__APPLE__) && !defined(_WIN32)
# define WEAKS_AVAILABLE 1
#endif
#ifndef CALLSTACK_WEAK
# ifdef WEAKS_AVAILABLE
# define CALLSTACK_WEAK __attribute__((weak))
# else // !WEAKS_AVAILABLE
# define CALLSTACK_WEAK
# endif // !WEAKS_AVAILABLE
#endif // CALLSTACK_WEAK predefined
#define ALWAYS_INLINE __attribute__((always_inline))
namespace android {
class Printer;
// Collect/print the call stack (function, file, line) traces for a single thread.
class CallStack {
public:
// Create an empty call stack. No-op.
CallStack();
// Create a callstack with the current thread's stack trace.
// Immediately dump it to logcat using the given logtag.
CallStack(const char* logtag, int32_t ignoreDepth = 1);
~CallStack();
// Reset the stack frames (same as creating an empty call stack).
void clear() { mFrameLines.clear(); }
// Immediately collect the stack traces for the specified thread.
// The default is to dump the stack of the current call.
void update(int32_t ignoreDepth = 1, pid_t tid = -1);
// Dump a stack trace to the log using the supplied logtag.
void log(const char* logtag,
android_LogPriority priority = ANDROID_LOG_DEBUG,
const char* prefix = nullptr) const;
// Dump a stack trace to the specified file descriptor.
void dump(int fd, int indent = 0, const char* prefix = nullptr) const;
// Return a string (possibly very long) containing the complete stack trace.
String8 toString(const char* prefix = nullptr) const;
// Dump a serialized representation of the stack trace to the specified printer.
void print(Printer& printer) const;
// Get the count of stack frames that are in this call stack.
size_t size() const { return mFrameLines.size(); }
// DO NOT USE ANYTHING BELOW HERE. The following public members are expected
// to disappear again shortly, once a better replacement facility exists.
// The replacement facility will be incompatible!
// Debugging accesses to some basic functionality. These use weak symbols to
// avoid introducing a dependency on libutilscallstack. Such a dependency from
// libutils results in a cyclic build dependency. These routines can be called
// from within libutils. But if the actual library is unavailable, they do
// nothing.
//
// DO NOT USE THESE. They will disappear.
struct StackDeleter {
#ifdef WEAKS_AVAILABLE
void operator()(CallStack* stack) {
deleteStack(stack);
}
#else
void operator()(CallStack*) {}
#endif
};
typedef std::unique_ptr<CallStack, StackDeleter> CallStackUPtr;
// Return current call stack if possible, nullptr otherwise.
#ifdef WEAKS_AVAILABLE
static CallStackUPtr ALWAYS_INLINE getCurrent(int32_t ignoreDepth = 1) {
if (reinterpret_cast<uintptr_t>(getCurrentInternal) == 0) {
ALOGW("CallStack::getCurrentInternal not linked, returning null");
return CallStackUPtr(nullptr);
} else {
return getCurrentInternal(ignoreDepth);
}
}
#else // !WEAKS_AVAILABLE
static CallStackUPtr ALWAYS_INLINE getCurrent(int32_t = 1) {
return CallStackUPtr(nullptr);
}
#endif // !WEAKS_AVAILABLE
#ifdef WEAKS_AVAILABLE
static void ALWAYS_INLINE logStack(const char* logtag, CallStack* stack = getCurrent().get(),
android_LogPriority priority = ANDROID_LOG_DEBUG) {
if (reinterpret_cast<uintptr_t>(logStackInternal) != 0 && stack != nullptr) {
logStackInternal(logtag, stack, priority);
} else {
ALOG(LOG_WARN, logtag, "CallStack::logStackInternal not linked");
}
}
#else
static void ALWAYS_INLINE logStack(const char* logtag, CallStack* = getCurrent().get(),
android_LogPriority = ANDROID_LOG_DEBUG) {
ALOG(LOG_WARN, logtag, "CallStack::logStackInternal not linked");
}
#endif // !WEAKS_AVAILABLE
#ifdef WEAKS_AVAILABLE
static String8 ALWAYS_INLINE stackToString(const char* prefix = nullptr,
const CallStack* stack = getCurrent().get()) {
if (reinterpret_cast<uintptr_t>(stackToStringInternal) != 0 && stack != nullptr) {
return stackToStringInternal(prefix, stack);
} else {
return String8::format("%s<CallStack package not linked>", (prefix ? prefix : ""));
}
}
#else // !WEAKS_AVAILABLE
static String8 ALWAYS_INLINE stackToString(const char* prefix = nullptr,
const CallStack* = getCurrent().get()) {
return String8::format("%s<CallStack package not linked>", (prefix ? prefix : ""));
}
#endif // !WEAKS_AVAILABLE
private:
#ifdef WEAKS_AVAILABLE
static CallStackUPtr CALLSTACK_WEAK getCurrentInternal(int32_t ignoreDepth);
static void CALLSTACK_WEAK logStackInternal(const char* logtag, const CallStack* stack,
android_LogPriority priority);
static String8 CALLSTACK_WEAK stackToStringInternal(const char* prefix, const CallStack* stack);
// The deleter is only invoked on non-null pointers. Hence it will never be
// invoked if CallStack is not linked.
static void CALLSTACK_WEAK deleteStack(CallStack* stack);
#endif // WEAKS_AVAILABLE
Vector<String8> mFrameLines;
};
} // namespace android
#endif // ANDROID_CALLSTACK_H
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