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//=-- lsan_common.h -------------------------------------------------------===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file is a part of LeakSanitizer.
// Private LSan header.
#include "sanitizer_common/sanitizer_allocator.h"
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_internal_defs.h"
#include "sanitizer_common/sanitizer_platform.h"
#include "sanitizer_common/sanitizer_stoptheworld.h"
#include "sanitizer_common/sanitizer_symbolizer.h"
// LeakSanitizer relies on some Glibc's internals (e.g. TLS machinery) thus
// supported for Linux only. Also, LSan doesn't like 32 bit architectures
// because of "small" (4 bytes) pointer size that leads to high false negative
// ratio on large leaks. But we still want to have it for some 32 bit arches
// (e.g. x86), see
// To enable LeakSanitizer on a new architecture, one needs to implement the
// internal_clone function as well as (probably) adjust the TLS machinery for
// the new architecture inside the sanitizer library.
(defined(__x86_64__) || defined(__mips64) || defined(__aarch64__) || \
#elif defined(__i386__) && \
#elif defined(__arm__) && \
namespace __sanitizer {
class FlagParser;
class ThreadRegistry;
struct DTLS;
namespace __lsan {
// Chunk tags.
enum ChunkTag {
kDirectlyLeaked = 0, // default
kIndirectlyLeaked = 1,
kReachable = 2,
kIgnored = 3
const u32 kInvalidTid = (u32) -1;
struct Flags {
#define LSAN_FLAG(Type, Name, DefaultValue, Description) Type Name;
#include ""
#undef LSAN_FLAG
void SetDefaults();
uptr pointer_alignment() const {
return use_unaligned ? 1 : sizeof(uptr);
extern Flags lsan_flags;
inline Flags *flags() { return &lsan_flags; }
void RegisterLsanFlags(FlagParser *parser, Flags *f);
struct Leak {
u32 id;
uptr hit_count;
uptr total_size;
u32 stack_trace_id;
bool is_directly_leaked;
bool is_suppressed;
struct LeakedObject {
u32 leak_id;
uptr addr;
uptr size;
// Aggregates leaks by stack trace prefix.
class LeakReport {
LeakReport() {}
void AddLeakedChunk(uptr chunk, u32 stack_trace_id, uptr leaked_size,
ChunkTag tag);
void ReportTopLeaks(uptr max_leaks);
void PrintSummary();
void ApplySuppressions();
uptr UnsuppressedLeakCount();
void PrintReportForLeak(uptr index);
void PrintLeakedObjectsForLeak(uptr index);
u32 next_id_ = 0;
InternalMmapVector<Leak> leaks_;
InternalMmapVector<LeakedObject> leaked_objects_;
typedef InternalMmapVector<uptr> Frontier;
// Platform-specific functions.
void InitializePlatformSpecificModules();
void ProcessGlobalRegions(Frontier *frontier);
void ProcessPlatformSpecificAllocations(Frontier *frontier);
struct RootRegion {
uptr begin;
uptr size;
InternalMmapVector<RootRegion> const *GetRootRegions();
void ScanRootRegion(Frontier *frontier, RootRegion const &region,
uptr region_begin, uptr region_end, bool is_readable);
// Run stoptheworld while holding any platform-specific locks.
void DoStopTheWorld(StopTheWorldCallback callback, void* argument);
void ScanRangeForPointers(uptr begin, uptr end,
Frontier *frontier,
const char *region_type, ChunkTag tag);
void ScanGlobalRange(uptr begin, uptr end, Frontier *frontier);
enum IgnoreObjectResult {
// Functions called from the parent tool.
const char *MaybeCallLsanDefaultOptions();
void InitCommonLsan();
void DoLeakCheck();
void DoRecoverableLeakCheckVoid();
void DisableCounterUnderflow();
bool DisabledInThisThread();
// Used to implement __lsan::ScopedDisabler.
void DisableInThisThread();
void EnableInThisThread();
// Can be used to ignore memory allocated by an intercepted
// function.
struct ScopedInterceptorDisabler {
ScopedInterceptorDisabler() { DisableInThisThread(); }
~ScopedInterceptorDisabler() { EnableInThisThread(); }
// According to Itanium C++ ABI array cookie is a one word containing
// size of allocated array.
static inline bool IsItaniumABIArrayCookie(uptr chunk_beg, uptr chunk_size,
uptr addr) {
return chunk_size == sizeof(uptr) && chunk_beg + chunk_size == addr &&
*reinterpret_cast<uptr *>(chunk_beg) == 0;
// According to ARM C++ ABI array cookie consists of two words:
// struct array_cookie {
// std::size_t element_size; // element_size != 0
// std::size_t element_count;
// };
static inline bool IsARMABIArrayCookie(uptr chunk_beg, uptr chunk_size,
uptr addr) {
return chunk_size == 2 * sizeof(uptr) && chunk_beg + chunk_size == addr &&
*reinterpret_cast<uptr *>(chunk_beg + sizeof(uptr)) == 0;
// Special case for "new T[0]" where T is a type with DTOR.
// new T[0] will allocate a cookie (one or two words) for the array size (0)
// and store a pointer to the end of allocated chunk. The actual cookie layout
// varies between platforms according to their C++ ABI implementation.
inline bool IsSpecialCaseOfOperatorNew0(uptr chunk_beg, uptr chunk_size,
uptr addr) {
#if defined(__arm__)
return IsARMABIArrayCookie(chunk_beg, chunk_size, addr);
return IsItaniumABIArrayCookie(chunk_beg, chunk_size, addr);
// The following must be implemented in the parent tool.
void ForEachChunk(ForEachChunkCallback callback, void *arg);
// Returns the address range occupied by the global allocator object.
void GetAllocatorGlobalRange(uptr *begin, uptr *end);
// Wrappers for allocator's ForceLock()/ForceUnlock().
void LockAllocator();
void UnlockAllocator();
// Returns true if [addr, addr + sizeof(void *)) is poisoned.
bool WordIsPoisoned(uptr addr);
// Wrappers for ThreadRegistry access.
void LockThreadRegistry();
void UnlockThreadRegistry();
ThreadRegistry *GetThreadRegistryLocked();
bool GetThreadRangesLocked(tid_t os_id, uptr *stack_begin, uptr *stack_end,
uptr *tls_begin, uptr *tls_end, uptr *cache_begin,
uptr *cache_end, DTLS **dtls);
void ForEachExtraStackRange(tid_t os_id, RangeIteratorCallback callback,
void *arg);
// If called from the main thread, updates the main thread's TID in the thread
// registry. We need this to handle processes that fork() without a subsequent
// exec(), which invalidates the recorded TID. To update it, we must call
// gettid() from the main thread. Our solution is to call this function before
// leak checking and also before every call to pthread_create() (to handle cases
// where leak checking is initiated from a non-main thread).
void EnsureMainThreadIDIsCorrect();
// If p points into a chunk that has been allocated to the user, returns its
// user-visible address. Otherwise, returns 0.
uptr PointsIntoChunk(void *p);
// Returns address of user-visible chunk contained in this allocator chunk.
uptr GetUserBegin(uptr chunk);
// Helper for __lsan_ignore_object().
IgnoreObjectResult IgnoreObjectLocked(const void *p);
// Return the linker module, if valid for the platform.
LoadedModule *GetLinker();
// Return true if LSan has finished leak checking and reported leaks.
bool HasReportedLeaks();
// Run platform-specific leak handlers.
void HandleLeaks();
// Wrapper for chunk metadata operations.
class LsanMetadata {
// Constructor accepts address of user-visible chunk.
explicit LsanMetadata(uptr chunk);
bool allocated() const;
ChunkTag tag() const;
void set_tag(ChunkTag value);
uptr requested_size() const;
u32 stack_trace_id() const;
void *metadata_;
} // namespace __lsan
extern "C" {
const char *__lsan_default_options();
int __lsan_is_turned_off();
const char *__lsan_default_suppressions();
} // extern "C"
#endif // LSAN_COMMON_H