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//=-- lsan_common.h -------------------------------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
#ifndef LSAN_COMMON_H
#define LSAN_COMMON_H
#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_symbolizer.h"
#if SANITIZER_LINUX && defined(__x86_64__) && (SANITIZER_WORDSIZE == 64)
#define CAN_SANITIZE_LEAKS 1
#else
#define CAN_SANITIZE_LEAKS 0
#endif
namespace __lsan {
// Chunk tags.
enum ChunkTag {
kDirectlyLeaked = 0, // default
kIndirectlyLeaked = 1,
kReachable = 2,
kIgnored = 3
};
struct Flags {
uptr pointer_alignment() const {
return use_unaligned ? 1 : sizeof(uptr);
}
// Print addresses of leaked objects after main leak report.
bool report_objects;
// Aggregate two objects into one leak if this many stack frames match. If
// zero, the entire stack trace must match.
int resolution;
// The number of leaks reported.
int max_leaks;
// If nonzero kill the process with this exit code upon finding leaks.
int exitcode;
// Flags controlling the root set of reachable memory.
// Global variables (.data and .bss).
bool use_globals;
// Thread stacks.
bool use_stacks;
// Thread registers.
bool use_registers;
// TLS and thread-specific storage.
bool use_tls;
// Regions added via __lsan_register_root_region().
bool use_root_regions;
// Consider unaligned pointers valid.
bool use_unaligned;
// Consider pointers found in poisoned memory to be valid.
bool use_poisoned;
// Debug logging.
bool log_pointers;
bool log_threads;
};
extern Flags lsan_flags;
inline Flags *flags() { return &lsan_flags; }
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 {
public:
LeakReport() : next_id_(0), leaks_(1), leaked_objects_(1) {}
void AddLeakedChunk(uptr chunk, u32 stack_trace_id, uptr leaked_size,
ChunkTag tag);
void ReportTopLeaks(uptr max_leaks);
void PrintSummary();
void ApplySuppressions();
uptr UnsuppressedLeakCount();
private:
void PrintReportForLeak(uptr index);
void PrintLeakedObjectsForLeak(uptr index);
u32 next_id_;
InternalMmapVector<Leak> leaks_;
InternalMmapVector<LeakedObject> leaked_objects_;
};
typedef InternalMmapVector<uptr> Frontier;
// Platform-specific functions.
void InitializePlatformSpecificModules();
void ProcessGlobalRegions(Frontier *frontier);
void ProcessPlatformSpecificAllocations(Frontier *frontier);
void ScanRangeForPointers(uptr begin, uptr end,
Frontier *frontier,
const char *region_type, ChunkTag tag);
enum IgnoreObjectResult {
kIgnoreObjectSuccess,
kIgnoreObjectAlreadyIgnored,
kIgnoreObjectInvalid
};
// Functions called from the parent tool.
void InitCommonLsan(bool standalone);
void DoLeakCheck();
bool DisabledInThisThread();
// Special case for "new T[0]" where T is a type with DTOR.
// new T[0] will allocate one word for the array size (0) and store a pointer
// to the end of allocated chunk.
inline bool IsSpecialCaseOfOperatorNew0(uptr chunk_beg, uptr chunk_size,
uptr addr) {
return chunk_size == sizeof(uptr) && chunk_beg + chunk_size == addr &&
*reinterpret_cast<uptr *>(chunk_beg) == 0;
}
// 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();
bool GetThreadRangesLocked(uptr os_id, uptr *stack_begin, uptr *stack_end,
uptr *tls_begin, uptr *tls_end,
uptr *cache_begin, uptr *cache_end);
void ForEachExtraStackRange(uptr 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);
// Wrapper for chunk metadata operations.
class LsanMetadata {
public:
// 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;
private:
void *metadata_;
};
} // namespace __lsan
extern "C" {
SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
int __lsan_is_turned_off();
SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
const char *__lsan_default_suppressions();
} // extern "C"
#endif // LSAN_COMMON_H
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