kc3-lang/angle/src/compiler/translator/PoolAlloc.h

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• Hash : 5546fb4f
  Author :
  Date : 2019-01-17T12:25:54
  

  Vulkan:Adding custom pool allocator
  
  Migrated pool allocator used by compiler to common.
  
  Planning to use this for ANGLE custom command buffers so this some
  refactoring in preparation for that work.
  
  Added a unit test to check PoolAllocator functionality.
  
  Bug: angleproject:2951
  Reviewed-on: https://chromium-review.googlesource.com/c/1476953
  Reviewed-by: Jamie Madill <jmadill@google.com>
  Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
  Commit-Queue: Tobin Ehlis <tobine@google.com>
  Change-Id: I0b4f3d55ea1799e35c9799c221f7129233f30b24
  Reviewed-on: https://chromium-review.googlesource.com/c/1492972
  

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• src/compiler/translator/PoolAlloc.h

• //
  // Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #ifndef COMPILER_TRANSLATOR_POOLALLOC_H_
  #define COMPILER_TRANSLATOR_POOLALLOC_H_
  
  //
  // This header defines the pool_allocator class that allows STL containers
  // to use the angle::PoolAllocator class by using the pool_allocator
  // class as the allocator (second) template argument.
  //
  // It also defines functions for managing the GlobalPoolAllocator used by the compiler.
  //
  
  #include <stddef.h>
  #include <string.h>
  #include <vector>
  
  #include "common/PoolAlloc.h"
  
  //
  // There could potentially be many pools with pops happening at
  // different times.  But a simple use is to have a global pop
  // with everyone using the same global allocator.
  //
  extern angle::PoolAllocator *GetGlobalPoolAllocator();
  extern void SetGlobalPoolAllocator(angle::PoolAllocator *poolAllocator);
  
  //
  // This STL compatible allocator is intended to be used as the allocator
  // parameter to templatized STL containers, like vector and map.
  //
  // It will use the pools for allocation, and not
  // do any deallocation, but will still do destruction.
  //
  template <class T>
  class pool_allocator
  {
    public:
      typedef size_t size_type;
      typedef ptrdiff_t difference_type;
      typedef T *pointer;
      typedef const T *const_pointer;
      typedef T &reference;
      typedef const T &const_reference;
      typedef T value_type;
  
      template <class Other>
      struct rebind
      {
          typedef pool_allocator<Other> other;
      };
      pointer address(reference x) const { return &x; }
      const_pointer address(const_reference x) const { return &x; }
  
      pool_allocator() {}
  
      template <class Other>
      pool_allocator(const pool_allocator<Other> &p)
      {}
  
      template <class Other>
      pool_allocator<T> &operator=(const pool_allocator<Other> &p)
      {
          return *this;
      }
  
  #if defined(__SUNPRO_CC) && !defined(_RWSTD_ALLOCATOR)
      // libCStd on some platforms have a different allocate/deallocate interface.
      // Caller pre-bakes sizeof(T) into 'n' which is the number of bytes to be
      // allocated, not the number of elements.
      void *allocate(size_type n) { return getAllocator().allocate(n); }
      void *allocate(size_type n, const void *) { return getAllocator().allocate(n); }
      void deallocate(void *, size_type) {}
  #else
      pointer allocate(size_type n)
      {
          return static_cast<pointer>(getAllocator().allocate(n * sizeof(T)));
      }
      pointer allocate(size_type n, const void *)
      {
          return static_cast<pointer>(getAllocator().allocate(n * sizeof(T)));
      }
      void deallocate(pointer, size_type) {}
  #endif  // _RWSTD_ALLOCATOR
  
      void construct(pointer p, const T &val) { new ((void *)p) T(val); }
      void destroy(pointer p) { p->T::~T(); }
  
      bool operator==(const pool_allocator &rhs) const { return true; }
      bool operator!=(const pool_allocator &rhs) const { return false; }
  
      size_type max_size() const { return static_cast<size_type>(-1) / sizeof(T); }
      size_type max_size(int size) const { return static_cast<size_type>(-1) / size; }
  
      angle::PoolAllocator &getAllocator() const { return *GetGlobalPoolAllocator(); }
  };
  
  #endif  // COMPILER_TRANSLATOR_POOLALLOC_H_
  

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