src/compiler/nir/nir_array.h

   1 /*
   2  * Copyright © 2015 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Jason Ekstrand (jason@jlekstrand.net)
  25  *
  26  */
  27
  28 #ifndef NIR_ARRAY_H
  29 #define NIR_ARRAY_H
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 typedef struct {
  36    void *mem_ctx;
  37    size_t size;
  38    size_t alloc;
  39    void *data;
  40 } nir_array;
  41
  42 static inline void
  43 nir_array_init(nir_array *arr, void *mem_ctx)
  44 {
  45    arr->mem_ctx = mem_ctx;
  46    arr->size = 0;
  47    arr->alloc = 0;
  48    arr->data = NULL;
  49 }
  50
  51 static inline void
  52 nir_array_fini(nir_array *arr)
  53 {
  54    if (arr->mem_ctx)
  55       ralloc_free(arr->data);
  56    else
  57       free(arr->data);
  58 }
  59
  60 #define NIR_ARRAY_INITIAL_SIZE 64
  61
  62 /* Increments the size of the array by the given ammount and returns a
  63  * pointer to the beginning of the newly added space.
  64  */
  65 static inline void *
  66 nir_array_grow(nir_array *arr, size_t additional)
  67 {
  68    size_t new_size = arr->size + additional;
  69    if (new_size > arr->alloc) {
  70       if (arr->alloc == 0)
  71          arr->alloc = NIR_ARRAY_INITIAL_SIZE;
  72
  73       while (new_size > arr->alloc)
  74          arr->alloc *= 2;
  75
  76       if (arr->mem_ctx)
  77          arr->data = reralloc_size(arr->mem_ctx, arr->data, arr->alloc);
  78       else
  79          arr->data = realloc(arr->data, arr->alloc);
  80    }
  81
  82    void *ptr = (void *)((char *)arr->data + arr->size);
  83    arr->size = new_size;
  84
  85    return ptr;
  86 }
  87
  88 #define nir_array_add(arr, type, elem) \
  89    *(type *)nir_array_grow(arr, sizeof(type)) = (elem)
  90
  91 #define nir_array_foreach(arr, type, elem) \
  92    for (type *elem = (type *)(arr)->data; \
  93         elem < (type *)((char *)(arr)->data + (arr)->size); elem++)
  94
  95 #ifdef __cplusplus
  96 } /* extern "C" */
  97 #endif
  98
  99 #endif /* NIR_ARRAY_H */