src/testing_portal.h

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#ifndef TESTING_PORTAL_H_
#define TESTING_PORTAL_H_
#include "config.h"

#include <stdlib.h>
#include <string.h>

#include <gperftools/malloc_extension.h>

#include "base/function_ref.h"
#include "base/basictypes.h"

namespace tcmalloc {

class ATTRIBUTE_HIDDEN TestingPortal {
public:
  static inline constexpr char kMagic[] = "tcmalloc.impl.testing-portal";
  static TestingPortal* Get() {
    static TestingPortal* instance = ([] () {
      struct {
        TestingPortal* ptr = nullptr;
        size_t v = 0;
      } s;
      bool ok = MallocExtension::instance()->GetNumericProperty(kMagic, &s.v);
      if (!ok || s.ptr == nullptr) {
        abort();
      }
      return s.ptr;
    })();

    return instance;
  }
  static TestingPortal** CheckGetPortal(const char* property_name, size_t* value) {
    if (strcmp(property_name, kMagic) != 0) {
      return nullptr;
    }
    return reinterpret_cast<TestingPortal**>(value) - 1;
  }

  virtual bool HaveSystemRelease() = 0;
  virtual bool IsDebuggingMalloc() = 0;
  virtual size_t GetPageSize() = 0;
  virtual size_t GetMinAlign() = 0;
  virtual size_t GetMaxSize() = 0;
  virtual int64_t& GetSampleParameter() = 0;
  virtual double& GetReleaseRate() = 0;
  virtual int32_t& GetMaxFreeQueueSize() = 0;

  virtual bool HasEmergencyMalloc() = 0;
  virtual bool IsEmergencyPtr(void* ptr) = 0;
  virtual void WithEmergencyMallocEnabled(FunctionRef<void()> body) = 0;

protected:
  virtual ~TestingPortal();
};

}  // namespace tcmalloc

#endif  // TESTING_PORTAL_H_