mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-30 03:22:14 +00:00
423 lines
17 KiB
C++
423 lines
17 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
|
|
// Copyright (c) 2005, Google Inc.
|
|
// All rights reserved.
|
|
//
|
|
// Redistribution and use in source and binary forms, with or without
|
|
// modification, are permitted provided that the following conditions are
|
|
// met:
|
|
//
|
|
// * Redistributions of source code must retain the above copyright
|
|
// notice, this list of conditions and the following disclaimer.
|
|
// * Redistributions in binary form must reproduce the above
|
|
// copyright notice, this list of conditions and the following disclaimer
|
|
// in the documentation and/or other materials provided with the
|
|
// distribution.
|
|
// * Neither the name of Google Inc. nor the names of its
|
|
// contributors may be used to endorse or promote products derived from
|
|
// this software without specific prior written permission.
|
|
//
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
// ---
|
|
// Author: Maxim Lifantsev (with design ideas by Sanjay Ghemawat)
|
|
//
|
|
//
|
|
// Module for detecing heap (memory) leaks.
|
|
//
|
|
// For full(er) information, see doc/heap_checker.html
|
|
//
|
|
// This module can be linked into programs with
|
|
// no slowdown caused by this unless you activate the leak-checker:
|
|
//
|
|
// 1. Set the environment variable HEAPCHEK to _type_ before
|
|
// running the program.
|
|
//
|
|
// _type_ is usually "normal" but can also be "minimal", "strict", or
|
|
// "draconian". (See the html file for other options, like 'local'.)
|
|
//
|
|
// After that, just run your binary. If the heap-checker detects
|
|
// a memory leak at program-exit, it will print instructions on how
|
|
// to track down the leak.
|
|
|
|
#ifndef BASE_HEAP_CHECKER_H_
|
|
#define BASE_HEAP_CHECKER_H_
|
|
|
|
#include <sys/types.h> // for size_t
|
|
// I can't #include config.h in this public API file, but I should
|
|
// really use configure (and make malloc_extension.h a .in file) to
|
|
// figure out if the system has stdint.h or not. But I'm lazy, so
|
|
// for now I'm assuming it's a problem only with MSVC.
|
|
#ifndef _MSC_VER
|
|
#include <stdint.h> // for uintptr_t
|
|
#endif
|
|
#include <stdarg.h> // for va_list
|
|
#include <vector>
|
|
|
|
// Annoying stuff for windows -- makes sure clients can import these functions
|
|
#ifndef PERFTOOLS_DLL_DECL
|
|
# ifdef _WIN32
|
|
# define PERFTOOLS_DLL_DECL __declspec(dllimport)
|
|
# else
|
|
# define PERFTOOLS_DLL_DECL
|
|
# endif
|
|
#endif
|
|
|
|
|
|
// The class is thread-safe with respect to all the provided static methods,
|
|
// as well as HeapLeakChecker objects: they can be accessed by multiple threads.
|
|
class PERFTOOLS_DLL_DECL HeapLeakChecker {
|
|
public:
|
|
|
|
// ----------------------------------------------------------------------- //
|
|
// Static functions for working with (whole-program) leak checking.
|
|
|
|
// If heap leak checking is currently active in some mode
|
|
// e.g. if leak checking was started (and is still active now)
|
|
// due to HEAPCHECK=... defined in the environment.
|
|
// The return value reflects iff HeapLeakChecker objects manually
|
|
// constructed right now will be doing leak checking or nothing.
|
|
// Note that we can go from active to inactive state during InitGoogle()
|
|
// if FLAGS_heap_check gets set to "" by some code before/during InitGoogle().
|
|
static bool IsActive();
|
|
|
|
// Return pointer to the whole-program checker if it has been created
|
|
// and NULL otherwise.
|
|
// Once GlobalChecker() returns non-NULL that object will not disappear and
|
|
// will be returned by all later GlobalChecker calls.
|
|
// This is mainly to access BytesLeaked() and ObjectsLeaked() (see below)
|
|
// for the whole-program checker after one calls NoGlobalLeaks()
|
|
// or similar and gets false.
|
|
static HeapLeakChecker* GlobalChecker();
|
|
|
|
// Do whole-program leak check now (if it was activated for this binary);
|
|
// return false only if it was activated and has failed.
|
|
// The mode of the check is controlled by the command-line flags.
|
|
// This method can be called repeatedly.
|
|
// Things like GlobalChecker()->SameHeap() can also be called explicitly
|
|
// to do the desired flavor of the check.
|
|
static bool NoGlobalLeaks();
|
|
|
|
// If whole-program checker if active,
|
|
// cancel its automatic execution after main() exits.
|
|
// This requires that some leak check (e.g. NoGlobalLeaks())
|
|
// has been called at least once on the whole-program checker.
|
|
static void CancelGlobalCheck();
|
|
|
|
// ----------------------------------------------------------------------- //
|
|
// Non-static functions for starting and doing leak checking.
|
|
|
|
// Start checking and name the leak check performed.
|
|
// The name is used in naming dumped profiles
|
|
// and needs to be unique only within your binary.
|
|
// It must also be a string that can be a part of a file name,
|
|
// in particular not contain path expressions.
|
|
explicit HeapLeakChecker(const char *name);
|
|
|
|
// Destructor (verifies that some *NoLeaks or *SameHeap method
|
|
// has been called at least once).
|
|
~HeapLeakChecker();
|
|
|
|
// These used to be different but are all the same now: they return
|
|
// true iff all memory allocated since this HeapLeakChecker object
|
|
// was constructor is still reachable from global state.
|
|
//
|
|
// Because we fork to convert addresses to symbol-names, and forking
|
|
// is not thread-safe, and we may be called in a threaded context,
|
|
// we do not try to symbolize addresses when called manually.
|
|
bool NoLeaks() { return DoNoLeaks(DO_NOT_SYMBOLIZE); }
|
|
|
|
// These forms are obsolete; use NoLeaks() instead.
|
|
// TODO(csilvers): mark as DEPRECATED.
|
|
bool QuickNoLeaks() { return NoLeaks(); }
|
|
bool BriefNoLeaks() { return NoLeaks(); }
|
|
bool SameHeap() { return NoLeaks(); }
|
|
bool QuickSameHeap() { return NoLeaks(); }
|
|
bool BriefSameHeap() { return NoLeaks(); }
|
|
|
|
// Detailed information about the number of leaked bytes and objects
|
|
// (both of these can be negative as well).
|
|
// These are available only after a *SameHeap or *NoLeaks
|
|
// method has been called.
|
|
// Note that it's possible for both of these to be zero
|
|
// while SameHeap() or NoLeaks() returned false in case
|
|
// of a heap state change that is significant
|
|
// but preserves the byte and object counts.
|
|
ssize_t BytesLeaked() const;
|
|
ssize_t ObjectsLeaked() const;
|
|
|
|
// ----------------------------------------------------------------------- //
|
|
// Static helpers to make us ignore certain leaks.
|
|
|
|
// Scoped helper class. Should be allocated on the stack inside a
|
|
// block of code. Any heap allocations done in the code block
|
|
// covered by the scoped object (including in nested function calls
|
|
// done by the code block) will not be reported as leaks. This is
|
|
// the recommended replacement for the GetDisableChecksStart() and
|
|
// DisableChecksToHereFrom() routines below.
|
|
//
|
|
// Example:
|
|
// void Foo() {
|
|
// HeapLeakChecker::Disabler disabler;
|
|
// ... code that allocates objects whose leaks should be ignored ...
|
|
// }
|
|
//
|
|
// REQUIRES: Destructor runs in same thread as constructor
|
|
class Disabler {
|
|
public:
|
|
Disabler();
|
|
~Disabler();
|
|
private:
|
|
Disabler(const Disabler&); // disallow copy
|
|
void operator=(const Disabler&); // and assign
|
|
};
|
|
|
|
// Ignore an object located at 'ptr' (can go at the start or into the object)
|
|
// as well as all heap objects (transitively) referenced from it for the
|
|
// purposes of heap leak checking. Returns 'ptr' so that one can write
|
|
// static T* obj = IgnoreObject(new T(...));
|
|
//
|
|
// If 'ptr' does not point to an active allocated object at the time of this
|
|
// call, it is ignored; but if it does, the object must not get deleted from
|
|
// the heap later on.
|
|
//
|
|
// See also HiddenPointer, below, if you need to prevent a pointer from
|
|
// being traversed by the heap checker but do not wish to transitively
|
|
// whitelist objects referenced through it.
|
|
template <typename T>
|
|
static T* IgnoreObject(T* ptr) {
|
|
DoIgnoreObject(static_cast<const void*>(const_cast<const T*>(ptr)));
|
|
return ptr;
|
|
}
|
|
|
|
// Undo what an earlier IgnoreObject() call promised and asked to do.
|
|
// At the time of this call 'ptr' must point at or inside of an active
|
|
// allocated object which was previously registered with IgnoreObject().
|
|
static void UnIgnoreObject(const void* ptr);
|
|
|
|
// ----------------------------------------------------------------------- //
|
|
// Internal types defined in .cc
|
|
|
|
class Allocator;
|
|
struct RangeValue;
|
|
|
|
private:
|
|
|
|
// ----------------------------------------------------------------------- //
|
|
// Various helpers
|
|
|
|
// Create the name of the heap profile file.
|
|
// Should be deleted via Allocator::Free().
|
|
char* MakeProfileNameLocked();
|
|
|
|
// Helper for constructors
|
|
void Create(const char *name, bool make_start_snapshot);
|
|
|
|
enum ShouldSymbolize { SYMBOLIZE, DO_NOT_SYMBOLIZE };
|
|
|
|
// Helper for *NoLeaks and *SameHeap
|
|
bool DoNoLeaks(ShouldSymbolize should_symbolize);
|
|
|
|
// Helper for NoGlobalLeaks, also called by the global destructor.
|
|
static bool NoGlobalLeaksMaybeSymbolize(ShouldSymbolize should_symbolize);
|
|
|
|
// These used to be public, but they are now deprecated.
|
|
// Will remove entirely when all internal uses are fixed.
|
|
// In the meantime, use friendship so the unittest can still test them.
|
|
static void* GetDisableChecksStart();
|
|
static void DisableChecksToHereFrom(const void* start_address);
|
|
static void DisableChecksIn(const char* pattern);
|
|
friend void RangeDisabledLeaks();
|
|
friend void NamedTwoDisabledLeaks();
|
|
friend void* RunNamedDisabledLeaks(void*);
|
|
friend void TestHeapLeakCheckerNamedDisabling();
|
|
|
|
// Actually implements IgnoreObject().
|
|
static void DoIgnoreObject(const void* ptr);
|
|
|
|
// Disable checks based on stack trace entry at a depth <=
|
|
// max_depth. Used to hide allocations done inside some special
|
|
// libraries.
|
|
static void DisableChecksFromToLocked(const void* start_address,
|
|
const void* end_address,
|
|
int max_depth);
|
|
|
|
// Helper for DoNoLeaks to ignore all objects reachable from all live data
|
|
static void IgnoreAllLiveObjectsLocked(const void* self_stack_top);
|
|
|
|
// Callback we pass to TCMalloc_ListAllProcessThreads (see thread_lister.h)
|
|
// that is invoked when all threads of our process are found and stopped.
|
|
// The call back does the things needed to ignore live data reachable from
|
|
// thread stacks and registers for all our threads
|
|
// as well as do other global-live-data ignoring
|
|
// (via IgnoreNonThreadLiveObjectsLocked)
|
|
// during the quiet state of all threads being stopped.
|
|
// For the argument meaning see the comment by TCMalloc_ListAllProcessThreads.
|
|
// Here we only use num_threads and thread_pids, that TCMalloc_ListAllProcessThreads
|
|
// fills for us with the number and pids of all the threads of our process
|
|
// it found and attached to.
|
|
static int IgnoreLiveThreadsLocked(void* parameter,
|
|
int num_threads,
|
|
pid_t* thread_pids,
|
|
va_list ap);
|
|
|
|
// Helper for IgnoreAllLiveObjectsLocked and IgnoreLiveThreadsLocked
|
|
// that we prefer to execute from IgnoreLiveThreadsLocked
|
|
// while all threads are stopped.
|
|
// This helper does live object discovery and ignoring
|
|
// for all objects that are reachable from everything
|
|
// not related to thread stacks and registers.
|
|
static void IgnoreNonThreadLiveObjectsLocked();
|
|
|
|
// Helper for IgnoreNonThreadLiveObjectsLocked and IgnoreLiveThreadsLocked
|
|
// to discover and ignore all heap objects
|
|
// reachable from currently considered live objects
|
|
// (live_objects static global variable in out .cc file).
|
|
// "name", "name2" are two strings that we print one after another
|
|
// in a debug message to describe what kind of live object sources
|
|
// are being used.
|
|
static void IgnoreLiveObjectsLocked(const char* name, const char* name2);
|
|
|
|
// Do the overall whole-program heap leak check if needed;
|
|
// returns true when did the leak check.
|
|
static bool DoMainHeapCheck();
|
|
|
|
// Type of task for UseProcMapsLocked
|
|
enum ProcMapsTask {
|
|
RECORD_GLOBAL_DATA,
|
|
DISABLE_LIBRARY_ALLOCS
|
|
};
|
|
|
|
// Success/Error Return codes for UseProcMapsLocked.
|
|
enum ProcMapsResult {
|
|
PROC_MAPS_USED,
|
|
CANT_OPEN_PROC_MAPS,
|
|
NO_SHARED_LIBS_IN_PROC_MAPS
|
|
};
|
|
|
|
// Read /proc/self/maps, parse it, and do the 'proc_maps_task' for each line.
|
|
static ProcMapsResult UseProcMapsLocked(ProcMapsTask proc_maps_task);
|
|
|
|
// A ProcMapsTask to disable allocations from 'library'
|
|
// that is mapped to [start_address..end_address)
|
|
// (only if library is a certain system library).
|
|
static void DisableLibraryAllocsLocked(const char* library,
|
|
uintptr_t start_address,
|
|
uintptr_t end_address);
|
|
|
|
// Return true iff "*ptr" points to a heap object
|
|
// ("*ptr" can point at the start or inside of a heap object
|
|
// so that this works e.g. for pointers to C++ arrays, C++ strings,
|
|
// multiple-inherited objects, or pointers to members).
|
|
// We also fill *object_size for this object then
|
|
// and we move "*ptr" to point to the very start of the heap object.
|
|
static inline bool HaveOnHeapLocked(const void** ptr, size_t* object_size);
|
|
|
|
// Helper to shutdown heap leak checker when it's not needed
|
|
// or can't function properly.
|
|
static void TurnItselfOffLocked();
|
|
|
|
// Internally-used c-tor to start whole-executable checking.
|
|
HeapLeakChecker();
|
|
|
|
// ----------------------------------------------------------------------- //
|
|
// Friends and externally accessed helpers.
|
|
|
|
// Helper for VerifyHeapProfileTableStackGet in the unittest
|
|
// to get the recorded allocation caller for ptr,
|
|
// which must be a heap object.
|
|
static const void* GetAllocCaller(void* ptr);
|
|
friend void VerifyHeapProfileTableStackGet();
|
|
|
|
// This gets to execute before constructors for all global objects
|
|
static void BeforeConstructorsLocked();
|
|
friend void HeapLeakChecker_BeforeConstructors();
|
|
|
|
// This gets to execute after destructors for all global objects
|
|
friend void HeapLeakChecker_AfterDestructors();
|
|
|
|
// Full starting of recommended whole-program checking.
|
|
friend void HeapLeakChecker_InternalInitStart();
|
|
|
|
// Runs REGISTER_HEAPCHECK_CLEANUP cleanups and potentially
|
|
// calls DoMainHeapCheck
|
|
friend void HeapLeakChecker_RunHeapCleanups();
|
|
|
|
// ----------------------------------------------------------------------- //
|
|
// Member data.
|
|
|
|
class SpinLock* lock_; // to make HeapLeakChecker objects thread-safe
|
|
const char* name_; // our remembered name (we own it)
|
|
// NULL means this leak checker is a noop
|
|
|
|
// Snapshot taken when the checker was created. May be NULL
|
|
// for the global heap checker object. We use void* instead of
|
|
// HeapProfileTable::Snapshot* to avoid including heap-profile-table.h.
|
|
void* start_snapshot_;
|
|
|
|
bool has_checked_; // if we have done the leak check, so these are ready:
|
|
ssize_t inuse_bytes_increase_; // bytes-in-use increase for this checker
|
|
ssize_t inuse_allocs_increase_; // allocations-in-use increase
|
|
// for this checker
|
|
bool keep_profiles_; // iff we should keep the heap profiles we've made
|
|
|
|
// ----------------------------------------------------------------------- //
|
|
|
|
// Disallow "evil" constructors.
|
|
HeapLeakChecker(const HeapLeakChecker&);
|
|
void operator=(const HeapLeakChecker&);
|
|
};
|
|
|
|
|
|
// Holds a pointer that will not be traversed by the heap checker.
|
|
// Contrast with HeapLeakChecker::IgnoreObject(o), in which o and
|
|
// all objects reachable from o are ignored by the heap checker.
|
|
template <class T>
|
|
class HiddenPointer {
|
|
public:
|
|
explicit HiddenPointer(T* t)
|
|
: masked_t_(reinterpret_cast<uintptr_t>(t) ^ kHideMask) {
|
|
}
|
|
// Returns unhidden pointer. Be careful where you save the result.
|
|
T* get() const { return reinterpret_cast<T*>(masked_t_ ^ kHideMask); }
|
|
|
|
private:
|
|
// Arbitrary value, but not such that xor'ing with it is likely
|
|
// to map one valid pointer to another valid pointer:
|
|
static const uintptr_t kHideMask =
|
|
static_cast<uintptr_t>(0xF03A5F7BF03A5F7Bll);
|
|
uintptr_t masked_t_;
|
|
};
|
|
|
|
// A class that exists solely to run its destructor. This class should not be
|
|
// used directly, but instead by the REGISTER_HEAPCHECK_CLEANUP macro below.
|
|
class PERFTOOLS_DLL_DECL HeapCleaner {
|
|
public:
|
|
typedef void (*void_function)(void);
|
|
HeapCleaner(void_function f);
|
|
static void RunHeapCleanups();
|
|
private:
|
|
static std::vector<void_function>* heap_cleanups_;
|
|
};
|
|
|
|
// A macro to declare module heap check cleanup tasks
|
|
// (they run only if we are doing heap leak checking.)
|
|
// 'body' should be the cleanup code to run. 'name' doesn't matter,
|
|
// but must be unique amongst all REGISTER_HEAPCHECK_CLEANUP calls.
|
|
#define REGISTER_HEAPCHECK_CLEANUP(name, body) \
|
|
namespace { \
|
|
void heapcheck_cleanup_##name() { body; } \
|
|
static HeapCleaner heapcheck_cleaner_##name(&heapcheck_cleanup_##name); \
|
|
}
|
|
|
|
#endif // BASE_HEAP_CHECKER_H_
|