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src/share/vm/memory/padded.inline.hpp

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  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_MEMORY_PADDED_INLINE_HPP
  26 #define SHARE_VM_MEMORY_PADDED_INLINE_HPP
  27 
  28 #include "memory/allocation.inline.hpp"
  29 #include "memory/padded.hpp"
  30 #include "utilities/debug.hpp"
  31 #include "utilities/globalDefinitions.hpp"
  32 
  33 // Creates an aligned padded array.
  34 // The memory can't be deleted since the raw memory chunk is not returned.
  35 template <class T, MEMFLAGS flags, size_t alignment>
  36 PaddedEnd<T>* PaddedArray<T, flags, alignment>::create_unfreeable(uint length) {
  37   // Check that the PaddedEnd class works as intended.
  38   STATIC_ASSERT(is_size_aligned_(sizeof(PaddedEnd<T>), alignment));
  39 
  40   // Allocate a chunk of memory large enough to allow for some alignment.
  41   void* chunk = AllocateHeap(length * sizeof(PaddedEnd<T, alignment>) + alignment, flags);
  42 
  43   // Make the initial alignment.
  44   PaddedEnd<T>* aligned_padded_array = (PaddedEnd<T>*)align_ptr_up(chunk, alignment);
  45 
  46   // Call the default constructor for each element.
  47   for (uint i = 0; i < length; i++) {
  48     ::new (&aligned_padded_array[i]) T();
  49   }
  50 
  51   return aligned_padded_array;
  52 }
  53 
  54 template <class T, MEMFLAGS flags, size_t alignment>
  55 T** Padded2DArray<T, flags, alignment>::create_unfreeable(uint rows, uint columns, size_t* allocation_size) {
  56   // Calculate and align the size of the first dimension's table.
  57   size_t table_size = align_size_up_(rows * sizeof(T*), alignment);
  58   // The size of the separate rows.
  59   size_t row_size = align_size_up_(columns * sizeof(T), alignment);
  60   // Total size consists of the indirection table plus the rows.
  61   size_t total_size = table_size + rows * row_size + alignment;
  62 
  63   // Allocate a chunk of memory large enough to allow alignment of the chunk.
  64   void* chunk = AllocateHeap(total_size, flags);
  65   // Clear the allocated memory.
  66   memset(chunk, 0, total_size);
  67   // Align the chunk of memory.
  68   T** result = (T**)align_ptr_up(chunk, alignment);
  69   void* data_start = (void*)((uintptr_t)result + table_size);
  70 
  71   // Fill in the row table.
  72   for (size_t i = 0; i < rows; i++) {
  73     result[i] = (T*)((uintptr_t)data_start + i * row_size);
  74   }
  75 
  76   if (allocation_size != NULL) {
  77     *allocation_size = total_size;
  78   }
  79 
  80   return result;
  81 }
  82 
  83 template <class T, MEMFLAGS flags, size_t alignment>
  84 T* PaddedPrimitiveArray<T, flags, alignment>::create_unfreeable(size_t length) {
  85   // Allocate a chunk of memory large enough to allow for some alignment.
  86   void* chunk = AllocateHeap(length * sizeof(T) + alignment, flags);
  87 
  88   memset(chunk, 0, length * sizeof(T) + alignment);
  89 
  90   return (T*)align_ptr_up(chunk, alignment);
  91 }
  92 
  93 #endif // SHARE_VM_MEMORY_PADDED_INLINE_HPP


  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_MEMORY_PADDED_INLINE_HPP
  26 #define SHARE_VM_MEMORY_PADDED_INLINE_HPP
  27 
  28 #include "memory/allocation.inline.hpp"
  29 #include "memory/padded.hpp"
  30 #include "utilities/debug.hpp"
  31 #include "utilities/globalDefinitions.hpp"
  32 
  33 // Creates an aligned padded array.
  34 // The memory can't be deleted since the raw memory chunk is not returned.
  35 template <class T, MEMFLAGS flags, size_t alignment>
  36 PaddedEnd<T>* PaddedArray<T, flags, alignment>::create_unfreeable(uint length) {
  37   // Check that the PaddedEnd class works as intended.
  38   STATIC_ASSERT(is_aligned_(sizeof(PaddedEnd<T>), alignment));
  39 
  40   // Allocate a chunk of memory large enough to allow for some alignment.
  41   void* chunk = AllocateHeap(length * sizeof(PaddedEnd<T, alignment>) + alignment, flags);
  42 
  43   // Make the initial alignment.
  44   PaddedEnd<T>* aligned_padded_array = (PaddedEnd<T>*)align_up(chunk, alignment);
  45 
  46   // Call the default constructor for each element.
  47   for (uint i = 0; i < length; i++) {
  48     ::new (&aligned_padded_array[i]) T();
  49   }
  50 
  51   return aligned_padded_array;
  52 }
  53 
  54 template <class T, MEMFLAGS flags, size_t alignment>
  55 T** Padded2DArray<T, flags, alignment>::create_unfreeable(uint rows, uint columns, size_t* allocation_size) {
  56   // Calculate and align the size of the first dimension's table.
  57   size_t table_size = align_up_(rows * sizeof(T*), alignment);
  58   // The size of the separate rows.
  59   size_t row_size = align_up_(columns * sizeof(T), alignment);
  60   // Total size consists of the indirection table plus the rows.
  61   size_t total_size = table_size + rows * row_size + alignment;
  62 
  63   // Allocate a chunk of memory large enough to allow alignment of the chunk.
  64   void* chunk = AllocateHeap(total_size, flags);
  65   // Clear the allocated memory.
  66   memset(chunk, 0, total_size);
  67   // Align the chunk of memory.
  68   T** result = (T**)align_up(chunk, alignment);
  69   void* data_start = (void*)((uintptr_t)result + table_size);
  70 
  71   // Fill in the row table.
  72   for (size_t i = 0; i < rows; i++) {
  73     result[i] = (T*)((uintptr_t)data_start + i * row_size);
  74   }
  75 
  76   if (allocation_size != NULL) {
  77     *allocation_size = total_size;
  78   }
  79 
  80   return result;
  81 }
  82 
  83 template <class T, MEMFLAGS flags, size_t alignment>
  84 T* PaddedPrimitiveArray<T, flags, alignment>::create_unfreeable(size_t length) {
  85   // Allocate a chunk of memory large enough to allow for some alignment.
  86   void* chunk = AllocateHeap(length * sizeof(T) + alignment, flags);
  87 
  88   memset(chunk, 0, length * sizeof(T) + alignment);
  89 
  90   return (T*)align_up(chunk, alignment);
  91 }
  92 
  93 #endif // SHARE_VM_MEMORY_PADDED_INLINE_HPP
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