test/dynalloc.cpp

// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#include "main.h"

#if EIGEN_MAX_ALIGN_BYTES>0
#define ALIGNMENT EIGEN_MAX_ALIGN_BYTES
#else
#define ALIGNMENT 1
#endif

typedef Matrix<float,16,1> Vector16f;
typedef Matrix<float,8,1> Vector8f;

void check_handmade_aligned_malloc()
{
  // Hand-make alignment needs at least sizeof(void*) to store the offset.
  constexpr int alignment = (std::max<int>)(EIGEN_DEFAULT_ALIGN_BYTES, sizeof(void*));
  
  for(int i = 1; i < 1000; i++)
  {
    char *p = (char*)internal::handmade_aligned_malloc(i, alignment);
    VERIFY(internal::UIntPtr(p)%ALIGNMENT==0);
    // if the buffer is wrongly allocated this will give a bad write --> check with valgrind
    for(int j = 0; j < i; j++) p[j]=0;
    internal::handmade_aligned_free(p);
  }
}

void check_aligned_malloc()
{
  for(int i = ALIGNMENT; i < 1000; i++)
  {
    char *p = (char*)internal::aligned_malloc(i);
    VERIFY(internal::UIntPtr(p)%ALIGNMENT==0);
    // if the buffer is wrongly allocated this will give a bad write --> check with valgrind
    for(int j = 0; j < i; j++) p[j]=0;
    internal::aligned_free(p);
  }
}

void check_aligned_new()
{
  for(int i = ALIGNMENT; i < 1000; i++)
  {
    float *p = internal::aligned_new<float>(i);
    VERIFY(internal::UIntPtr(p)%ALIGNMENT==0);
    // if the buffer is wrongly allocated this will give a bad write --> check with valgrind
    for(int j = 0; j < i; j++) p[j]=0;
    internal::aligned_delete(p,i);
  }
}

void check_aligned_stack_alloc()
{
  for(int i = ALIGNMENT; i < 400; i++)
  {
    ei_declare_aligned_stack_constructed_variable(float,p,i,0);
    VERIFY(internal::UIntPtr(p)%ALIGNMENT==0);
    // if the buffer is wrongly allocated this will give a bad write --> check with valgrind
    for(int j = 0; j < i; j++) p[j]=0;
  }
}


// test compilation with both a struct and a class...
struct MyStruct
{
  EIGEN_MAKE_ALIGNED_OPERATOR_NEW
  char dummychar;
  Vector16f avec;
};

class MyClassA
{
  public:
    EIGEN_MAKE_ALIGNED_OPERATOR_NEW
    char dummychar;
    Vector16f avec;
};

template<typename T> void check_dynaligned()
{
  // TODO have to be updated once we support multiple alignment values
  if(T::SizeAtCompileTime % ALIGNMENT == 0)
  {
    T* obj = new T;
    VERIFY(T::NeedsToAlign==1);
    VERIFY(internal::UIntPtr(obj)%ALIGNMENT==0);
    delete obj;
  }
}

template<typename T> void check_custom_new_delete()
{
  {
    T* t = new T;
    delete t;
  }
  
  {
    std::size_t N = internal::random<std::size_t>(1,10);
    T* t = new T[N];
    delete[] t;
  }
  
#if EIGEN_MAX_ALIGN_BYTES>0 && (!EIGEN_HAS_CXX17_OVERALIGN)
  {
    T* t = static_cast<T *>((T::operator new)(sizeof(T)));
    (T::operator delete)(t, sizeof(T));
  }
  
  {
    T* t = static_cast<T *>((T::operator new)(sizeof(T)));
    (T::operator delete)(t);
  }
#endif
}

EIGEN_DECLARE_TEST(dynalloc)
{
  // low level dynamic memory allocation
  CALL_SUBTEST(check_handmade_aligned_malloc());
  CALL_SUBTEST(check_aligned_malloc());
  CALL_SUBTEST(check_aligned_new());
  CALL_SUBTEST(check_aligned_stack_alloc());

  for (int i=0; i<g_repeat*100; ++i)
  {
    CALL_SUBTEST( check_custom_new_delete<Vector4f>() );
    CALL_SUBTEST( check_custom_new_delete<Vector2f>() );
    CALL_SUBTEST( check_custom_new_delete<Matrix4f>() );
    CALL_SUBTEST( check_custom_new_delete<MatrixXi>() );
  }
  
  // check static allocation, who knows ?
  #if EIGEN_MAX_STATIC_ALIGN_BYTES
  for (int i=0; i<g_repeat*100; ++i)
  {
    CALL_SUBTEST(check_dynaligned<Vector4f>() );
    CALL_SUBTEST(check_dynaligned<Vector2d>() );
    CALL_SUBTEST(check_dynaligned<Matrix4f>() );
    CALL_SUBTEST(check_dynaligned<Vector4d>() );
    CALL_SUBTEST(check_dynaligned<Vector4i>() );
    CALL_SUBTEST(check_dynaligned<Vector8f>() );
    CALL_SUBTEST(check_dynaligned<Vector16f>() );
  }

  {
    MyStruct foo0;  VERIFY(internal::UIntPtr(foo0.avec.data())%ALIGNMENT==0);
    MyClassA fooA;  VERIFY(internal::UIntPtr(fooA.avec.data())%ALIGNMENT==0);
  }
  
  // dynamic allocation, single object
  for (int i=0; i<g_repeat*100; ++i)
  {
    MyStruct *foo0 = new MyStruct();  VERIFY(internal::UIntPtr(foo0->avec.data())%ALIGNMENT==0);
    MyClassA *fooA = new MyClassA();  VERIFY(internal::UIntPtr(fooA->avec.data())%ALIGNMENT==0);
    delete foo0;
    delete fooA;
  }

  // dynamic allocation, array
  const int N = 10;
  for (int i=0; i<g_repeat*100; ++i)
  {
    MyStruct *foo0 = new MyStruct[N];  VERIFY(internal::UIntPtr(foo0->avec.data())%ALIGNMENT==0);
    MyClassA *fooA = new MyClassA[N];  VERIFY(internal::UIntPtr(fooA->avec.data())%ALIGNMENT==0);
    delete[] foo0;
    delete[] fooA;
  }
  #endif
  
}