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264 lines
8.6 KiB
C++
264 lines
8.6 KiB
C++
//=-- lsan_common.h -------------------------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of LeakSanitizer.
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// Private LSan header.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LSAN_COMMON_H
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#define LSAN_COMMON_H
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#include "sanitizer_common/sanitizer_allocator.h"
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_internal_defs.h"
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#include "sanitizer_common/sanitizer_platform.h"
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#include "sanitizer_common/sanitizer_stoptheworld.h"
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#include "sanitizer_common/sanitizer_symbolizer.h"
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// LeakSanitizer relies on some Glibc's internals (e.g. TLS machinery) thus
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// supported for Linux only. Also, LSan doesn't like 32 bit architectures
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// because of "small" (4 bytes) pointer size that leads to high false negative
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// ratio on large leaks. But we still want to have it for some 32 bit arches
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// (e.g. x86), see https://github.com/google/sanitizers/issues/403.
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// To enable LeakSanitizer on a new architecture, one needs to implement the
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// internal_clone function as well as (probably) adjust the TLS machinery for
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// the new architecture inside the sanitizer library.
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#if (SANITIZER_LINUX && !SANITIZER_ANDROID || SANITIZER_MAC) && \
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(SANITIZER_WORDSIZE == 64) && \
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(defined(__x86_64__) || defined(__mips64) || defined(__aarch64__) || \
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defined(__powerpc64__))
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#define CAN_SANITIZE_LEAKS 1
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#elif defined(__i386__) && \
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(SANITIZER_LINUX && !SANITIZER_ANDROID || SANITIZER_MAC)
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#define CAN_SANITIZE_LEAKS 1
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#elif defined(__arm__) && \
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SANITIZER_LINUX && !SANITIZER_ANDROID
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#define CAN_SANITIZE_LEAKS 1
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#else
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#define CAN_SANITIZE_LEAKS 0
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#endif
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namespace __sanitizer {
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class FlagParser;
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class ThreadRegistry;
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struct DTLS;
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}
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namespace __lsan {
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// Chunk tags.
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enum ChunkTag {
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kDirectlyLeaked = 0, // default
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kIndirectlyLeaked = 1,
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kReachable = 2,
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kIgnored = 3
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};
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const u32 kInvalidTid = (u32) -1;
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struct Flags {
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#define LSAN_FLAG(Type, Name, DefaultValue, Description) Type Name;
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#include "lsan_flags.inc"
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#undef LSAN_FLAG
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void SetDefaults();
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uptr pointer_alignment() const {
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return use_unaligned ? 1 : sizeof(uptr);
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}
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};
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extern Flags lsan_flags;
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inline Flags *flags() { return &lsan_flags; }
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void RegisterLsanFlags(FlagParser *parser, Flags *f);
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struct Leak {
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u32 id;
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uptr hit_count;
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uptr total_size;
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u32 stack_trace_id;
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bool is_directly_leaked;
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bool is_suppressed;
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};
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struct LeakedObject {
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u32 leak_id;
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uptr addr;
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uptr size;
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};
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// Aggregates leaks by stack trace prefix.
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class LeakReport {
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public:
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LeakReport() {}
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void AddLeakedChunk(uptr chunk, u32 stack_trace_id, uptr leaked_size,
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ChunkTag tag);
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void ReportTopLeaks(uptr max_leaks);
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void PrintSummary();
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void ApplySuppressions();
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uptr UnsuppressedLeakCount();
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private:
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void PrintReportForLeak(uptr index);
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void PrintLeakedObjectsForLeak(uptr index);
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u32 next_id_ = 0;
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InternalMmapVector<Leak> leaks_;
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InternalMmapVector<LeakedObject> leaked_objects_;
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};
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typedef InternalMmapVector<uptr> Frontier;
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// Platform-specific functions.
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void InitializePlatformSpecificModules();
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void ProcessGlobalRegions(Frontier *frontier);
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void ProcessPlatformSpecificAllocations(Frontier *frontier);
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struct RootRegion {
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uptr begin;
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uptr size;
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};
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InternalMmapVector<RootRegion> const *GetRootRegions();
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void ScanRootRegion(Frontier *frontier, RootRegion const ®ion,
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uptr region_begin, uptr region_end, bool is_readable);
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// Run stoptheworld while holding any platform-specific locks.
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void DoStopTheWorld(StopTheWorldCallback callback, void* argument);
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void ScanRangeForPointers(uptr begin, uptr end,
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Frontier *frontier,
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const char *region_type, ChunkTag tag);
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void ScanGlobalRange(uptr begin, uptr end, Frontier *frontier);
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enum IgnoreObjectResult {
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kIgnoreObjectSuccess,
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kIgnoreObjectAlreadyIgnored,
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kIgnoreObjectInvalid
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};
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// Functions called from the parent tool.
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const char *MaybeCallLsanDefaultOptions();
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void InitCommonLsan();
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void DoLeakCheck();
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void DoRecoverableLeakCheckVoid();
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void DisableCounterUnderflow();
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bool DisabledInThisThread();
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// Used to implement __lsan::ScopedDisabler.
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void DisableInThisThread();
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void EnableInThisThread();
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// Can be used to ignore memory allocated by an intercepted
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// function.
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struct ScopedInterceptorDisabler {
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ScopedInterceptorDisabler() { DisableInThisThread(); }
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~ScopedInterceptorDisabler() { EnableInThisThread(); }
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};
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// According to Itanium C++ ABI array cookie is a one word containing
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// size of allocated array.
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static inline bool IsItaniumABIArrayCookie(uptr chunk_beg, uptr chunk_size,
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uptr addr) {
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return chunk_size == sizeof(uptr) && chunk_beg + chunk_size == addr &&
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*reinterpret_cast<uptr *>(chunk_beg) == 0;
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}
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// According to ARM C++ ABI array cookie consists of two words:
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// struct array_cookie {
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// std::size_t element_size; // element_size != 0
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// std::size_t element_count;
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// };
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static inline bool IsARMABIArrayCookie(uptr chunk_beg, uptr chunk_size,
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uptr addr) {
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return chunk_size == 2 * sizeof(uptr) && chunk_beg + chunk_size == addr &&
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*reinterpret_cast<uptr *>(chunk_beg + sizeof(uptr)) == 0;
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}
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// Special case for "new T[0]" where T is a type with DTOR.
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// new T[0] will allocate a cookie (one or two words) for the array size (0)
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// and store a pointer to the end of allocated chunk. The actual cookie layout
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// varies between platforms according to their C++ ABI implementation.
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inline bool IsSpecialCaseOfOperatorNew0(uptr chunk_beg, uptr chunk_size,
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uptr addr) {
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#if defined(__arm__)
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return IsARMABIArrayCookie(chunk_beg, chunk_size, addr);
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#else
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return IsItaniumABIArrayCookie(chunk_beg, chunk_size, addr);
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#endif
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}
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// The following must be implemented in the parent tool.
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void ForEachChunk(ForEachChunkCallback callback, void *arg);
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// Returns the address range occupied by the global allocator object.
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void GetAllocatorGlobalRange(uptr *begin, uptr *end);
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// Wrappers for allocator's ForceLock()/ForceUnlock().
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void LockAllocator();
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void UnlockAllocator();
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// Returns true if [addr, addr + sizeof(void *)) is poisoned.
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bool WordIsPoisoned(uptr addr);
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// Wrappers for ThreadRegistry access.
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void LockThreadRegistry();
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void UnlockThreadRegistry();
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ThreadRegistry *GetThreadRegistryLocked();
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bool GetThreadRangesLocked(tid_t os_id, uptr *stack_begin, uptr *stack_end,
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uptr *tls_begin, uptr *tls_end, uptr *cache_begin,
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uptr *cache_end, DTLS **dtls);
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void ForEachExtraStackRange(tid_t os_id, RangeIteratorCallback callback,
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void *arg);
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// If called from the main thread, updates the main thread's TID in the thread
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// registry. We need this to handle processes that fork() without a subsequent
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// exec(), which invalidates the recorded TID. To update it, we must call
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// gettid() from the main thread. Our solution is to call this function before
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// leak checking and also before every call to pthread_create() (to handle cases
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// where leak checking is initiated from a non-main thread).
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void EnsureMainThreadIDIsCorrect();
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// If p points into a chunk that has been allocated to the user, returns its
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// user-visible address. Otherwise, returns 0.
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uptr PointsIntoChunk(void *p);
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// Returns address of user-visible chunk contained in this allocator chunk.
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uptr GetUserBegin(uptr chunk);
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// Helper for __lsan_ignore_object().
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IgnoreObjectResult IgnoreObjectLocked(const void *p);
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// Return the linker module, if valid for the platform.
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LoadedModule *GetLinker();
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// Return true if LSan has finished leak checking and reported leaks.
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bool HasReportedLeaks();
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// Run platform-specific leak handlers.
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void HandleLeaks();
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// Wrapper for chunk metadata operations.
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class LsanMetadata {
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public:
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// Constructor accepts address of user-visible chunk.
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explicit LsanMetadata(uptr chunk);
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bool allocated() const;
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ChunkTag tag() const;
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void set_tag(ChunkTag value);
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uptr requested_size() const;
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u32 stack_trace_id() const;
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private:
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void *metadata_;
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};
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} // namespace __lsan
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extern "C" {
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SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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const char *__lsan_default_options();
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SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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int __lsan_is_turned_off();
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SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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const char *__lsan_default_suppressions();
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} // extern "C"
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#endif // LSAN_COMMON_H
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