1/* -*- c++ -*- */
2/*
3 * Copyright © 2010-2014 Intel Corporation
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
14 * Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25#ifndef BRW_IR_ALLOCATOR_H
26#define BRW_IR_ALLOCATOR_H
27
28#include "main/macros.h"
29
30namespace brw {
31   /**
32    * Simple allocator used to keep track of virtual GRFs.
33    */
34   class simple_allocator {
35   public:
36      simple_allocator() :
37         sizes(NULL), offsets(NULL), count(0), total_size(0), capacity(0)
38      {
39      }
40
41      ~simple_allocator()
42      {
43         free(offsets);
44         free(sizes);
45      }
46
47      unsigned
48      allocate(unsigned size)
49      {
50         assert(size > 0);
51         if (capacity <= count) {
52            capacity = MAX2(16, capacity * 2);
53            sizes = (unsigned *)realloc(sizes, capacity * sizeof(unsigned));
54            offsets = (unsigned *)realloc(offsets, capacity * sizeof(unsigned));
55         }
56
57         sizes[count] = size;
58         offsets[count] = total_size;
59         total_size += size;
60
61         return count++;
62      }
63
64      /**
65       * Array of sizes for each allocation.  The allocation unit is up to the
66       * back-end, but it's expected to be one scalar value in the FS back-end
67       * and one vec4 in the VEC4 back-end.
68       */
69      unsigned *sizes;
70
71      /**
72       * Array of offsets from the start of the VGRF space in allocation
73       * units.
74       */
75      unsigned *offsets;
76
77      /** Total number of VGRFs allocated. */
78      unsigned count;
79
80      /** Cumulative size in allocation units. */
81      unsigned total_size;
82
83   private:
84      unsigned capacity;
85   };
86}
87
88#endif
89