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 #pragma once
  29
  30 #ifdef __cplusplus
  31 extern "C" {
  32 #endif
  33
  34 typedef struct {
  35    void *mem_ctx;
  36    size_t size;
  37    size_t alloc;
  38    void *data;
  39 } nir_array;
  40
  41 static inline void
  42 nir_array_init(nir_array *arr, void *mem_ctx)
  43 {
  44    arr->mem_ctx = mem_ctx;
  45    arr->size = 0;
  46    arr->alloc = 0;
  47    arr->data = NULL;
  48 }
  49
  50 static inline void
  51 nir_array_fini(nir_array *arr)
  52 {
  53    if (arr->mem_ctx)
  54       ralloc_free(arr->data);
  55    else
  56       free(arr->data);
  57 }
  58
  59 #define NIR_ARRAY_INITIAL_SIZE 64
  60
  61 /* Increments the size of the array by the given ammount and returns a
  62  * pointer to the beginning of the newly added space.
  63  */
  64 static inline void *
  65 nir_array_grow(nir_array *arr, size_t additional)
  66 {
  67    size_t new_size = arr->size + additional;
  68    if (new_size > arr->alloc) {
  69       if (arr->alloc == 0)
  70          arr->alloc = NIR_ARRAY_INITIAL_SIZE;
  71
  72       while (new_size > arr->alloc)
  73          arr->alloc *= 2;
  74
  75       if (arr->mem_ctx)
  76          arr->data = reralloc_size(arr->mem_ctx, arr->data, arr->alloc);
  77       else
  78          arr->data = realloc(arr->data, arr->alloc);
  79    }
  80
  81    void *ptr = (void *)((char *)arr->data + arr->size);
  82    arr->size = new_size;
  83
  84    return ptr;
  85 }
  86
  87 #define nir_array_add(arr, type, elem) \
  88    *(type *)nir_array_grow(arr, sizeof(type)) = (elem)
  89
  90 #define nir_array_foreach(arr, type, elem) \
  91    for (type *elem = (type *)(arr)->data; \
  92         elem < (type *)((char *)(arr)->data + (arr)->size); elem++)
  93
  94 #ifdef __cplusplus
  95 } /* extern "C" */
  96 #endif