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  1. /*
  2.  * Copyright © 2012 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.  *    Eric Anholt <eric@anholt.net>
  25.  *
  26.  */
  27.  
  28. #include "brw_fs.h"
  29. #include "main/bitset.h"
  30.  
  31. namespace brw {
  32.  
  33. struct block_data {
  34.    /**
  35.     * Which variables are defined before being used in the block.
  36.     *
  37.     * Note that for our purposes, "defined" means unconditionally, completely
  38.     * defined.
  39.     */
  40.    BITSET_WORD *def;
  41.  
  42.    /**
  43.     * Which variables are used before being defined in the block.
  44.     */
  45.    BITSET_WORD *use;
  46.  
  47.    /** Which defs reach the entry point of the block. */
  48.    BITSET_WORD *livein;
  49.  
  50.    /** Which defs reach the exit point of the block. */
  51.    BITSET_WORD *liveout;
  52. };
  53.  
  54. class fs_live_variables {
  55. public:
  56.    static void* operator new(size_t size, void *ctx)
  57.    {
  58.       void *node;
  59.  
  60.       node = rzalloc_size(ctx, size);
  61.       assert(node != NULL);
  62.  
  63.       return node;
  64.    }
  65.  
  66.    fs_live_variables(fs_visitor *v, cfg_t *cfg);
  67.    ~fs_live_variables();
  68.  
  69.    void setup_def_use();
  70.    void compute_live_variables();
  71.  
  72.    fs_visitor *v;
  73.    cfg_t *cfg;
  74.    void *mem_ctx;
  75.  
  76.    int num_vars;
  77.    int bitset_words;
  78.  
  79.    /** Per-basic-block information on live variables */
  80.    struct block_data *bd;
  81. };
  82.  
  83. } /* namespace brw */
  84.