dart::BacktrackStack Class Reference

Public Member Functions
	BacktrackStack ()
	~BacktrackStack ()
bool	out_of_memory () const
int32_t *	data () const
intptr_t	max_size () const

Detailed Description

Definition at line 140 of file regexp_interpreter.cc.

Constructor & Destructor Documentation

BacktrackStack()

dart::BacktrackStack::BacktrackStack ( )

inline

Definition at line 142 of file regexp_interpreter.cc.

                   {
    memory_ = Isolate::Current()->TakeRegexpBacktrackStack();
    // Note: using malloc here has a potential of triggering jemalloc/tcmalloc
    // bugs which cause application to leak memory and eventually OOM.
    // See https://github.com/dart-lang/sdk/issues/38820 and
    // https://github.com/flutter/flutter/issues/29007 for examples.
    // So instead we directly ask OS to provide us memory.
    if (memory_ == nullptr) {
      const bool executable = false;
      const bool compressed = false;
      const intptr_t size_in_bytes = Utils::RoundUp(
          FLAG_regexp_backtrack_stack_size_kb * KB, VirtualMemory::PageSize());
      memory_ = std::unique_ptr<VirtualMemory>(VirtualMemory::Allocate(
          size_in_bytes, executable, compressed, "regexp-backtrack-stack"));
    }
  }

~BacktrackStack()

dart::BacktrackStack::~BacktrackStack ( )

inline

Definition at line 159 of file regexp_interpreter.cc.

                    {
    if (memory_ != nullptr) {
      Isolate::Current()->CacheRegexpBacktrackStack(std::move(memory_));
    }
  }

Member Function Documentation

data()

int32_t * dart::BacktrackStack::data ( ) const

inline

Definition at line 167 of file regexp_interpreter.cc.

                        {
    return reinterpret_cast<int32_t*>(memory_->address());
  }

max_size()

intptr_t dart::BacktrackStack::max_size ( ) const

inline

Definition at line 171 of file regexp_interpreter.cc.

{ return memory_->size() / sizeof(int32_t); }

out_of_memory()

bool dart::BacktrackStack::out_of_memory ( ) const

inline

Definition at line 165 of file regexp_interpreter.cc.

{ return memory_ == nullptr; }

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The documentation for this class was generated from the following file:

• third_party/dart-lang/sdk/runtime/vm/regexp_interpreter.cc