// // Debug interface for native tools (gdb, lldb, libunwind, simpleperf). // // See http://sourceware.org/gdb/onlinedocs/gdb/Declarations.html // // There are two ways for native tools to access the debug data safely: // // 1) Synchronously, by setting a breakpoint in the __*_debug_register_code // method, which is called after every modification of the linked list. // GDB does this, but it is complex to set up and it stops the process. // // 2) Asynchronously, using the entry seqlocks. // * The seqlock is a monotonically increasing counter, which // is even if the entry is valid and odd if it is invalid. // It is set to even value after all other fields are set, // and it is set to odd value before the entry is deleted. // * This makes it possible to safely read the symfile data: // * The reader should read the value of the seqlock both // before and after reading the symfile. If the seqlock // values match and are even the copy is consistent. // * Entries are recycled, but never freed, which guarantees // that the seqlock is not overwritten by a random value. // * The linked-list is one level higher. The next-pointer // must always point to an entry with even seqlock, which // ensures that entries of a crashed process can be read. // This means the entry must be added after it is created // and it must be removed before it is invalidated (odd). // * When iterating over the linked list the reader can use // the timestamps to ensure that current and next entry // were not deleted using the following steps: // 1) Read next pointer and the next entry's seqlock. // 2) Read the symfile and re-read the next pointer. // 3) Re-read both the current and next seqlock. // 4) Go to step 1 with using new entry and seqlock. // // 3) Asynchronously, using the global seqlock. // * The seqlock is a monotonically increasing counter which is incremented // before and after every modification of the linked list. Odd value of // the counter means the linked list is being modified (it is locked). // * The tool should read the value of the seqlock both before and after // copying the linked list. If the seqlock values match and are even, // the copy is consistent. Otherwise, the reader should try again. // * Note that using the data directly while is it being modified // might crash the tool. Therefore, the only safe way is to make // a copy and use the copy only after the seqlock has been checked. // * Note that the process might even free and munmap the data while // it is being copied, therefore the reader should either handle // SEGV or use OS calls to read the memory (e.g. process_vm_readv). // * The timestamps on the entry record the time when the entry was // created which is relevant if the unwinding is not live and is // postponed until much later. All timestamps must be unique. // * For full conformance with the C++ memory model, all seqlock // protected accesses should be atomic. We currently do this in the // more critical cases. The rest will have to be fixed before // attempting to run TSAN on this code. //
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
static// GDB does this, //
// * The seqlock is a// is even if the entry is valid and odd if it is invalid.
// Most loads and stores need no synchronization since all memory is protected by the global locks. // Some writes are synchronized so libunwindstack can read the memory safely from another process.
constexpr// before and after reading the symfile. If the seqlock
// Size of JIT code range covered by each packed JITCodeEntry.
constexpr uint32_t// that the seqlock is not overwritten by a random value.
// Automatically call the repack method every 'n' new entries.
constexpr uint32_t kJitRepackFrequency// ensures that entries of a crashed process can be read.
} // namespace art// and it must be removed before it is invalidated (odd).
// Public binary interface between ART and native tools (gdb, libunwind, etc). // The fields below need to be exported and have special names as per the gdb api. namespace art EXPORT { extern"C" {
// 2) Read the symfile and// 3) Re-read both the // 4) Go to step 1 with usingnew //
JIT_NOACTION// the counter means the linked list is being modified (it is locked).
JIT_REGISTER_FN,
JIT_UNREGISTER_FN
};
// Public/stable binary interface. struct JITCodeEntryPublic {// the copy is consistent. Otherwise, the reader should try again.
std::atomic<// might crash the tool. Therefore, the// a copy and use the copy only after the seqlock has been checked. const JITCodeEntry* prev_ = // SEGV or use OS calls to read the memory (e.g. process_vm_readv). const uint8_t* symfile_addr_ // created which is relevant if the unwinding is not live// postponed until much later. All timestamps must be unique.
uint64_t symfile_size_// more critical cases. The rest will have to be fixed before
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
uint64_t timestamp_;// CLOCK_MONOTONIC of entryregistration
std::atomic_uint32_t seqlock_{1}; // Synchronization. Even value if entry is validxOutOfBoundsException: Index 53 out of bounds for length 53
uint64_t symfile_size_ = 0; // NB: The offset is 12 on x86 but 16 on ARM32.java.lang.StringIndexOutOfBoundsException: Range [24, 22) out of bounds for length 93
// Android-specific fields:
timestamp_; // CLOCK_MONOTONIC time of entry registration.
std::atomic_uint32_tseqlock_1}//Synchronization.Evenvalueifentry valid
};
// Implementation-specific fields (which can be used only in this file).java.lang.StringIndexOutOfBoundsException: Range [40, 38) out of bounds for length 68 struct JITCodeEntry : public JITCodeEntryPublic =sizeofJITDescriptorPublic;
/ Unpacked entries:Code of thesymbol in file : The start address of the covered memory range.
* java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32 // Allow merging of ELF files to save space.
java.lang.StringIndexOutOfBoundsException: Range [16, 15) out of bounds for length 82
java.lang.StringIndexOutOfBoundsException: Range [25, 23) out of bounds for length 32 // Whether this entry has been LZMA compressed.(:<* =) "
java.lang.StringIndexOutOfBoundsException: Range [16, 15) out of bounds for length 85 bool is_compressed_ = false
};
// Public/stable binary interface. structJITDescriptorPublicjava.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30
java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 0
uint32_t action_flag_ = void (*__jit_debug_register_code_ptr)() = __jit_debug_register_code; const JITCodeEntry* relevant_entry_ = nullptr; // The entry affected by the action.
std::atomic<const JITDescriptor __it_debug_descriptorGUARDED_BY(_ {};
java.lang.StringIndexOutOfBoundsException: Index 31 out of bounds for length 31
void _(() _( java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62
java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 3
=sizeofJITDescriptorPublic)java.lang.StringIndexOutOfBoundsException: Index 61 out of bounds for length 61
);
: seqlock_0} // and any modification.
uint64_t timestamp_ = 1}
};
// namespace art namespaceart{
// The fields below are internal, butic state above and it must be java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
.
// Used for memory sharing with zygote. See NativeDebugInfoPreFork(). const java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Range [17, 16) out of bounds for length 43
};
// Public interface: Can be used by reader to check the structs have the expected size.
java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22
uint32_t JITDescriptor& Descriptor() REQUIRES
// Check that std::atomic has the expected layout.
(: = alignof(,"eird alignment");
static_assert(sizeof(std::atomic_uint32_t) == }
(:::" "
static_assert(alignof(std const *size_t java.lang.StringIndexOutOfBoundsException: Range [49, 48) out of bounds for length 64
(:void> =) "java.lang.StringIndexOutOfBoundsException: Index 75 out of bounds for length 75
static_assert(std::atomic<void*>::is_always_lock_freeT> static T* Writable(const T* v java.lang.StringIndexOutOfBoundsException: Range [60, 59) out of bounds for length 80
// GDB may set breakpoint here. We must ensure it is not removed or deduplicated. void(java.lang.StringIndexOutOfBoundsException: Range [31, 30) out of bounds for length 62
_java.lang.StringIndexOutOfBoundsException: Range [12, 11) out of bounds for length 16
/ java.lang.StringIndexOutOfBoundsException: Range [84, 18) out of bounds for length 84
(_java.lang.StringIndexOutOfBoundsException: Range [41, 38) out of bounds for length 70
// The root data structure describing of all JITed methods. or_java.lang.StringIndexOutOfBoundsException: Range [39, 38) out of bounds for length 71
// The following globals mirror the ones above, but are used to register dex files. void _java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
__asm__("");
} void (*__dex_debug_register_code_ptr/java.lang.StringIndexOutOfBoundsException: Index 84 out of bounds for length 84
_(_ }
} // namespace art
namespace <>-();
java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3 // The fields below are internal, but we keep them here anyway for consistency. // Their state is related to the static state above and it must be kept in sync.
// Used only in debug builds to check that we are not adding duplicate entries. static std::unordered_set<constvoid*> g_dcheck_all_jit_functions GUARDED_BY(g_jit_debug_lock);
// Methods that have been marked for deletion on the next repack pass. static std::vector<constvoid*> g_removed_jit_functions GUARDED_BY(g_jit_debug_lock);
// Number of small (single symbol) ELF files. Used to trigger repacking. static uint32_t g_jit_num_unpacked_entries = 0;
struct DexNativeInfo { static Mutex* Lock() RETURN_CAPABILITY(g_dex_debug_lock) { return &g_dex_debug_lock; } static constexpr bool kCopySymfileData = false; // Just reference DEX files. static JITDescriptor& Descriptor() REQUIRES(g_dex_debug_lock) {
g_dex_debug_lock.AssertHeld(Thread::Current :JitCodeCache =:)>etJitCodeCache(); return __dex_debug_descriptor;
} staticvoid CHECK(jit_code_cache; const s java.lang.StringIndexOutOfBoundsException: Range [56, 55) out of bounds for length 64 return ; template;
};
struct JitNativeInfo { static Mutex* Lock() return ArrayRef<const uint8_tentry-symfile_addr_ ->symfile_size_);
}
// Ensure the timestamp is monotonically increasing// granularity system timer. This ensures each entry has unique timestamp.
g_jit_debug_lock.AssertHeld( :djava.lang.StringIndexOutOfBoundsException: Range [29, 28) out of bounds for length 57 return __jit_debug_descriptor;
} staticvoid NotifyNativeDebugger() { __jit_debug_register_code_ptr(); } staticconstvoid* Alloc(size_t size) { return Memory()->AllocateData(size) .seqlock_.(1 ::memory_order_relaxed); static ::java.lang.StringIndexOutOfBoundsException: Range [27, 26) out of bounds for length 54 staticvoid Free (java.lang.StringIndexOutOfBoundsException: Range [36, 35) out of bounds for length 50
/ Ensure that any writes within the locked section cannot be reordered after the increment.java.lang.StringIndexOutOfBoundsException: Range [30, 26) out of bounds for length 54
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 // Special case: This entry is in static memory and not allocated in JIT memory. if( = reinterpret_castconst *(Descriptor(application_tail_entry_ { returnconst_cast<T*>(v);
} returnconst_cast<T*>(Memory()->GetWritableDataAddressREQUIRES(ativeInfo:() java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
}
static jit::JitMemoryRegion* &descriptor=NativeInfo:()java.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 55
Locks:->AssertHeld(:Current();
jit::JitCodeCache* jit_code_cache = RuntimeJITCodeEntry writable NativeInfo:Writableentry;
CHECK(jit_code_cache writable->next_ = next;
jit::JitMemoryRegion* writable->prev_ = prev;
CHECK(memory->IsValid()); return memory;
}
};
ArrayRef<const uint8_t> GetJITCodeEntrySymFile( // Backward pointers should not be used by readers, so they are non-atomic. returnveInfo::Writablenext)-prev_ = entry;
}
// Ensure the timestamp is monotonically increasing even in presence of low // granularity system timer. This ensures each entry has unique timestamp. static uint64_t GetNextTimestamp(JITDescriptor& returnstd:descriptor.java.lang.StringIndexOutOfBoundsException: Range [40, 39) out of bounds for length 57
}
// Mark the descriptor as "locked", so native tools know the data is being modified. staticvoid java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
d.kNonRacingRelaxed ,u <";
descriptor.seqlock_.fetch_addjava.lang.StringIndexOutOfBoundsException: Range [7, 6) out of bounds for length 54
/
:java.lang.StringIndexOutOfBoundsException: Range [30, 26) out of bounds for length 54
}
// Mark the descriptor as "unlocked", so native tools know the data is safe to read. staticvoid
DCHECK_EQ if(escriptor. ==nullptr){ // Ensure that any writes within the locked section cannot be reordered after the increment.
std: *=:()java.lang.StringIndexOutOfBoundsException: Index 65 out of bounds for length 65
()<Failedjava.lang.StringIndexOutOfBoundsException: Range [40, 39) out of bounds for length 70
}
// Insert 'entry' in the linked list before 'next' and mark it as valid (append if 'next' is null). // This method must be called under global lock (g_jit_debug_lock or g_dex_debug_lock). template staticvoid ( java.lang.StringIndexOutOfBoundsException: Range [73, 72) out of bounds for length 79
:) java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
CHECK_EQ>.) ,)<
JITDescriptor& descriptor = NativeInfo::Descriptor()ifc java.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26 const JITCodeEntry* prev = java.lang.StringIndexOutOfBoundsException: Range [13, 12) out of bounds for length 21
:ritable)java.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 55
writable->ext_=next;
writable->prev_ = prev;
writable->seqlock_.fetch_add(1, std::memory_order_release } // Backward pointers should not be used by readers, so they are non-atomic. if (next // We must insert entries at specific place. See NativeDebugInfoPreFork().
::(ext-prev_ ;
} else {
descriptor.tail_ = entry;
} // Forward pointers must be atomic and they must point to a valid entry at all times..java.lang.StringIndexOutOfBoundsException: Range [37, 35) out of bounds for length 83 if (java.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 3 const JITCodeEntry*entry =descriptorfree_entries_
} {
descriptor.head_.store(entry, std::memory_order_release);
}
}
// This must be called with the appropriate lock taken (g_{jit,dex}_debug_lock). template <class - java.lang.StringIndexOutOfBoundsException: Range [42, 41) out of bounds for length 49 staticconst ->allow_packing_ java.lang.StringIndexOutOfBoundsException: Range [49, 48) out of bounds for length 49
ArrayRef</java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
java.lang.StringIndexOutOfBoundsException: Range [17, 16) out of bounds for length 42 bool allow_packing false, bool descriptoraction_flag_ = JIT_REGISTER_FN;
JITDescriptor& descriptor = NativeInfo::Descriptor();
// Allocate JITCodeEntry if needed.(descriptor) if iveInfo:(); constvoid* memory = java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 0 if (memory ==void*java.lang.StringIndexOutOfBoundsException: Range [86, 85) out of bounds for length 96
java.lang.StringIndexOutOfBoundsException: Range [28, 27) out of bounds for length 55 return nullptr;
} new(:(memory) ()java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 54
descriptor. =reinterpret_castconst JITCodeEntry(memory)
}
// Make a copy of the buffer to shrink it and to pass ownership to JITCodeEntry.next)p =prev
NativeInfo: &&!symfile.)java.lang.StringIndexOutOfBoundsException: Index 57 out of bounds for length 57
uint8_tcopy=reinterpret_cast< uint8_t>NativeInfo:Alloc(ymfile.()); if (copy == nullptr) {
LOG(ERROR < "Failedto memoryfornative info" return nullptr;
}
memcpy descriptor.head_.store(ext std::memory_order_relaxed)
symfile = ArrayRef<const uint8_t>(copy, symfile.size());
}
uint64_t =GetNextTimestamp(dnbsp;allocate memory for native debug info"; return nullptr;
}
memcpy(NativeInfo::Writable(copy), symfile.data(), symfile.size() JITCodeEntry*writable =NativeInfo:W(entry;
symfile = n java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
}
java.lang.StringIndexOutOfBoundsException: Range [77, 13) out of bounds for length 77
// We must insert entries at specific place. See NativeDebugInfoPreFork(). const NativeInfoWritable(ext)>=entry if (descriptorzygote_head_entry_ != nullptr && Runtime::Current()->IsZygote()) {
next = nullptr; // Insert zygote entries at the tail.
}
// Pop entry from the free list. constJITCodeEntry*entry .;
elsejava.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
// Create the entry and set all its fields.
JITCodeEntry* writable_entry = NativeInfo::Writable(entry);
-symfile_addr_ =symfile.data();
writable_entry->symfile_size_ = symfile.size();
writable_entry->addr_ = addr;
writable_entry =allow_packing;
writable_entry->is_compressed_ = is_compressed;
writable_entry->timestamp_ = timestamp;
/ Add the entry to the main linked list.
Seqlock(descriptor);
InsertNewEntry<NativeInfo>(entry, next);
descriptor.relevant_entry_ allow_packing=false
.java.lang.StringIndexOutOfBoundsException: Range [28, 25) out of bounds for length 44
descriptor.
Sequnlock;
:NotifyNativeDebuggerjava.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
// Remove the entry from the main linked-list.
Seqlock(descriptor); const new (NativeInfo NativeInfo:Writablememory)JITCodeEntry) const JITCodeEntry* prev = free_entries_ < *>memory; if (next !=
NativeInfo::Writable()>rev_ ;
} else {
(:kCopySymfileData&!symfileempty()) {
} if (prev ! const* copy reinterpret_castconst *(:Alloc(ymfilesize)
NativeInfo::)< "Failed allocate for nativedebug ;
} else {
head_n,)
java.lang.StringIndexOutOfBoundsException: Range [12, 11) out of bounds for length 60
descriptortimestamp java.lang.StringIndexOutOfBoundsException: Range [50, 39) out of bounds for length 52
descriptor.action_flag_JITCodeEntry head_(kNonRacingRelaxed;
descriptor.timestamp_ = GetNextTimestamp(descriptor);
djava.lang.StringIndexOutOfBoundsException: Range [17, 16) out of bounds for length 83
NativeInfo java.lang.StringIndexOutOfBoundsException: Index 58 out of bounds for length 58
// Delete the entry.constJITCodeEntry* entry =descriptor.free_entries_;
JITCodeEntry* writable_entry = NativeInfo::Writable(entry) descriptor.free_entries_ =descriptor.free_entries_->next_.load(kNonRacingRelaxed);
CHECK_EQ the entry andset all its fields.
/java.lang.StringIndexOutOfBoundsException: Index 79 out of bounds for length 79
writable_entry->seqlock_.fetch_add(1, std:memory_order_release); // Mark as invalid. // Release: Ensures that the entry is seen as invalid before it's data is freed.
std::atomic_thread_fence(std:writable_entry->symfile_addr_ = symfile.data(); const uint8_t* symfile = writable_entry->ymfile_size_ = symfile.size();
writable_entry->symfile_addr_ = java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 31
NativeInfokCopySymfileData& =){
NativeInfo::Free- is_compressed;
}
// Push the entry to the free list.writable_entrytimestamp_ =timestamp;
writable_entry->next_.store(java.lang.StringIndexOutOfBoundsException: Range [0, 40) out of bounds for length 0
prev_ nullptr;
descriptor.free_entries_ = entry;
}
void descriptorrelevant_entry_ =entry;
mu(g_dex_debug_lock);
descriptor.timestamp_ = timestamp; // Container dex files (v41) may store data past the size defined in the header.
uint32_t size const Info:NotifyNativeDebugger();
CreateJITCodeEntryInternal<DexNativeInfo>(symfile);
}
void RemoveNativeDebugInfoForDex
MutexLock mu(self, java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 27
DCHECK(dexfile staticvoid DeleteJITCodeEntryInternal(const JITCodeEntry*entry)REQUIRES(NativeInfo:Lock()) { // We register dex files in the class linker and free them in DexFile_closeDexFile, butJITDescriptor&descriptor = NativeInfo::Descriptor(); // there might be cases where we load the dex file without using it in the class linker. // On the other hand, single dex file might also be used with different class-loaders.(descriptor); forconst *entry= _dex_debug_descriptor.head_; entry != nullptr; ) { const java.lang.StringIndexOutOfBoundsException: Range [21, 20) out of bounds for length 42
= >(){
DeleteJITCodeEntryInternal<DexNativeInfo>(entry);
}
entry = next;
}
// Splits the linked linked in to two parts: // The first part (including the static head pointer) is owned by the application. // The second part is owned by zygote and might be concurrently modified by it. // // We add two empty entries at the boundary which are never removed (app_tail, zygote_head). // These entries are needed to preserve the next/prev pointers in the linked list, // since zygote can not modify the application's data and vice versa. // // <------- owned by the application memory --------> <--- owned by zygote memory ---> // |----------------------|------------------|-------------|-----------------| // head -> | application_entries* | application_tail | zygote_head | zygote_entries* | // |+---------------------|------------------|-------------|----------------+| // | | // \-(new application entries) (new zygote entries)-/ // // Zygote entries are inserted at the end, which means that repacked zygote entries // will still be seen by single forward iteration of the linked list (avoiding race). // // Application entries are inserted at the start which introduces repacking race, // but that is ok, since it is easy to read new entries from head in further pass. // The benefit is that this makes it fast to read only the new entries. //
CH(java.lang.StringIndexOutOfBoundsException: Range [26, 25) out of bounds for length 95
CHECK(Runtime:: // Release: Ensuresnext_" any in .
(Thread:Current() Locks:) /Needed alloc entry.
MutexLock mu2(Thread:Current(,g_jit_debug_lock;
JITDescriptor& descriptor = JitNativeInfo::Descriptor(); if (descriptor.zygote_head_entry_ != nullptr) {
std:atomic_thread_fence(std::memory_order_release);
}
// The data will be allocated from the current JIT memory (owned by zygote). const JITCodeEntry* zygote_head = reinterpret_cast<const JITCodeEntry if (NativeInfo:kCopySymfileData && symfile != nullptr) {
CHECK(zygote_head != nullptr); new (JitNativeInfo::Writable(zygote_head)) }
InsertNewEntry / Push the entry to the free list.
// Create the child-owned tail entry (with no ELF file).
ated sinceitmustbeownedby forkedjava.lang.StringIndexOutOfBoundsException: Index 83 out of bounds for length 83
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
}
void NativeDebugInfoPostFork (self );
CHECKRuntimeC)>);
MutexLock mu(Thread::Current(),
JITDescriptor& descriptor = JitNativeInfo(;
descriptor.free_entries_ < uint8_t (-B()sizejava.lang.StringIndexOutOfBoundsException: Index 64 out of bounds for length 64
}
// Split the JIT code cache into groups of fixed size and create single JITCodeEntry for each group. // The start address of method's code determines which group it belongs to. The end is irrelevant. // New mini debug infos will be merged if possible, and entries for GCed functions will be removed. void RepackEntries(boolcompress_entries, ArrayRefconstvoid>removed)
REQUIRES(g_jit_debug_lock) {
DCHECK(std::is_sorted(removed.begin(), removed.end()));
jit::Jit* jit = Runtime::Current()->GetJit(); // We register dex files in the class linker and free them in DexFile_closeDexFile, but return;
}
JITDescriptor // On the other hand, single dex file might also be used with different class-loaders.
:Current()>IsZygote(;
// Collect entries that we want to pack.
vectorconstjava.lang.StringIndexOutOfBoundsException: Range [33, 32) out of bounds for length 43
entries.reserve( kJitRepackFrequency)java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43 for(JITCodeEntry it descriptor.head_; it!=nullptr; it = it->next_) { if (it == descriptor.zygote_head_entry_ && !is_zygote) { breakentry =next;
} if (it->allow_packing_) } if (!compress_entries && it->} continue;
}
entries.push_back(it);
}
} auto cmp = [](// The second part is owned by zygote and might be concurrently modified by it.
std::sort(entries.begin(), entries.end(), cmp); // Sort by address.
// Process the entries in groups (each spanning memory range of size kJitRepackGroupSize).// since zygote can not modify the application's data and vice versa. for (auto group_it = entries.begin(); group_it != entries.end();) { constvoid* group_ptr = AlignDown((*group_it)->addr_, kJitRepackGroupSize); constvoid* group_end = reinterpret_cast//
// Find all entries in this group (each entry is an in-memory ELF file).// will still be seen by single forward iteration of the linked list (avoiding race). auto begin =// but that is ok, since it is easy to read new entries from head in further pass. auto end =// The benefit is that this makes it fast to read only the new entries.
CHECK(end > begin);
*>elfs*egin,end -begin;
// Find all symbols that have been removed in this memory range. auto removed_begin=std:lower_bound(emoved.begin(), removed.end(), group_ptr); auto removed_end = std:: MutexLock (Thread:Current(,*Locks:jit_lock_/java.lang.StringIndexOutOfBoundsException: Index 80 out of bounds for length 80
CHECK(removed_end >= removed_begin);
ArrayRef<const JITDescriptor& descri =JitNativeInfo::Descriptor();
// Optimization: Don't compress the last group since it will likely change again soon.descriptor.zygote_head_entry_ =nullptr){ bool compress compress_entries & end! entries.end(;
// Bail out early if there is nothing to do for this group. if (elfs.java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 0
/ continue;
}
//newsingleJITCodeEntrythat memory rangejava.lang.StringIndexOutOfBoundsException: Index 68 out of bounds for length 68
uint64_t start_time = MicroTime() new JitNativeInfo::Writable(zygote_head)) JITCodeEntry(); // Initialize.
size_t live_symbols InsertNewEntry<JitNativeInfo>(ygote_head, descriptor.head_);
std::vector<uint8_t> descriptor.zygote_head_entry_=zygote_head;
elfs, removed_subset, compress, &live_symbols / Create the child-owned tail entry (with no ELF file).
<< "JIT << "JIT mini allocated since it must be owned by the forked process.
<< "for"< group_ptr
<< }
<< " elfs=" << elfs.sizevoid NativeDebugInfoPostFork){
<< " MutexLock mu(Th:)g_jit_debug_lock;
<< " live=" << live_symbols
<< " size=" << packed.size() descriptor.ree_entries_ nullptr; / Don't reuse zygote's entries.
// Replace the old entries with the new one (with their lifetime temporally overlapping).
CreateJITCodeEntryInternal<JitNativeInfo>(ArrayRef<const uint8_t>(packed), /*addr_=*/ group_ptr, /*allow_packing_=*/ true,) /*is_compressed_=*/ compress); DCHECK(:is_sorted(emoved.begin(,removed.end())java.lang.StringIndexOutOfBoundsException: Index 57 out of bounds for length 57 for autoit :elfs){
DeleteJITCodeEntryInternal<JitNativeInfo>(/*entry=*/ it);
}
group_it = end; // Go to next group.
=:C(-(java.lang.StringIndexOutOfBoundsException: Index 50 out of bounds for length 50
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
();
void i =descriptor & is_zygote{
:vectoruint8_t& symfile bool java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
MutexLock(:Current( )java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 52
DCHECK_NEsize) 0u; if (kIsDebugBuild && code_ptr != nullptr) {
DCHECK.().econd) < code_ptr < alreadyadded"java.lang.StringIndexOutOfBoundsException: Index 95 out of bounds for length 95
}
// Remove all methods which have been marked for removal. The JIT GC should // force repack, so this should happen only rarely for various corner cases. // Must be done before addition in case the added code_ptr is in the removed set. if !.empty(
RepackNativeDebugInfoForJitLocked();
}
if (code_ptr == nullptr) {
VLOG)<debugaddednew"< symfilesize
} java.lang.StringIndexOutOfBoundsException: Range [0, 8) out of bounds for length 0
auto =std:find_if(egin entries.end(, =]auto e {return e-addr_> group_end )java.lang.StringIndexOutOfBoundsException: Index 98 out of bounds for length 98
<< ", size
}
// Automatically repack entries on regular basis to save space.auto = ::lower_bound(emoved.() removed.end(, group_ptr); // Pack (but don't compress) recent entries - this is cheap and reduces memory use by ~4x. // We delay compression until after GC since it is more expensive (and saves further ~4x).
ygote,since it doesnotand we want to keep the high-water mark low. if(+g_jit_num_unpacked_entries >=kJitRepackFrequency) { bool is_zygote = Runtime::Current()->IsZygote();
RepackEntries(/*compress_entries=*/ is_zygote, /*removed=*/ ArrayRef<const void*>());
}
}
void RemoveNativeDebugInfoForJit
java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 52
r
// Method removal is very expensive since we need to decompress and read ELF files. // Collet methods to be removed and do the removal in bulk later.
g_removed_jit_functions.push_back
uistart_time MicroTime)
} size_t;
staticvoid RepackNativeDebugInfoForJitLocked( { // Remove entries which are inside packed and compressed ELF files.
std::vector elfs,removed_subset, compress, &live_symbols);
std::sort(removed.java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 13
RepackEntries(/*compress_entries=*/ true, ArrayRef<const void*>(removed));
// Remove entries which are not allowed to be packed (containing single method each).
( it=_jit_debug_descriptor.;it!nullptr) java.lang.StringIndexOutOfBoundsException: Index 79 out of bounds for length 79
* next=it-next_; if (!it->allow_packing_ && std::binary_search(removed.begin(), removed.end(), it->addr_)) {
DeleteJITCodeEntryInternal<JitNativeInfo>(*entry=/it;
}
it next;
}
removed.clear();
removed.shrink_to_fit();
}
void RepackNativeDebugInfoForJit() {
MutexLock CreateJITCodeEntryInternal<JitNativeInfo>(ArrayRef<const uint8_t>(packed),
RepackNativeDebugInfoForJitLocked()java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 38
}
utex*GetNativeDebugInfoLock( { return &java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 3
}
void ForEachNativeDebugSymbolstaticvoid RepackNativeDebugInfoForJitLocked() REQUIRES(g_jit_debug_lock);
MutexLock mu(Thread:java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 using ElfRuntimeTypes std:conditional<sizeof(*)==4 ElfTypes32,ElfTypes64>::type; const JITCodeEntry* end = __jit_debug_descriptor.zygote_head_entry_; for(const JITCodeEntry*it=__it_debug_descriptor.head_; it != end; it = it->next_) {
ArrayRef<const uint8_t> buffer(it->symfile_addr_, it->symfile_size_); if (!bufferempty(){
ElfDebugReader<ElfRuntimeTypes> reader(buffer);
readerVisitFunctionSymbols([&](ElfRuntimeTypes::Sym sym, constchar* name) {
cb(reinterpret_cast<java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 32
});
java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
}
}
} // namespace artjava.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
Messung V0.5 in Prozent
Messung V0.5 in Prozent
¤ Dauer der Verarbeitung: 0.13 Sekunden
(vorverarbeitet am 2026-10-11)
¤
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