src/compiler/nir/nir_metadata.c

   1 /*
   2  * Copyright © 2014 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 #include "nir.h"
  28
  29 /*
  30  * Handles management of the metadata.
  31  */
  32
  33 void
  34 nir_metadata_require(nir_function_impl *impl, nir_metadata required)
  35 {
  36 #define NEEDS_UPDATE(X) ((required & ~impl->valid_metadata) & (X))
  37
  38    if (NEEDS_UPDATE(nir_metadata_block_index))
  39       nir_index_blocks(impl);
  40    if (NEEDS_UPDATE(nir_metadata_dominance))
  41       nir_calc_dominance_impl(impl);
  42    if (NEEDS_UPDATE(nir_metadata_live_ssa_defs))
  43       nir_live_ssa_defs_impl(impl);
  44
  45 #undef NEEDS_UPDATE
  46
  47    impl->valid_metadata |= required;
  48 }
  49
  50 void
  51 nir_metadata_preserve(nir_function_impl *impl, nir_metadata preserved)
  52 {
  53    impl->valid_metadata &= preserved;
  54 }
  55
  56 #ifdef DEBUG
  57 /**
  58  * Make sure passes properly invalidate metadata (part 1).
  59  *
  60  * Call this before running a pass to set a bogus metadata flag, which will
  61  * only be preserved if the pass forgets to call nir_metadata_preserve().
  62  */
  63 void
  64 nir_metadata_set_validation_flag(nir_shader *shader)
  65 {
  66    nir_foreach_function(shader, function) {
  67       if (function->impl) {
  68          function->impl->valid_metadata |= nir_metadata_not_properly_reset;
  69       }
  70    }
  71 }
  72
  73 /**
  74  * Make sure passes properly invalidate metadata (part 2).
  75  *
  76  * Call this after a pass makes progress to verify that the bogus metadata set by
  77  * the earlier function was properly thrown away.  Note that passes may not call
  78  * nir_metadata_preserve() if they don't actually make any changes at all.
  79  */
  80 void
  81 nir_metadata_check_validation_flag(nir_shader *shader)
  82 {
  83    nir_foreach_function(shader, function) {
  84       if (function->impl) {
  85          assert(!(function->impl->valid_metadata &
  86                   nir_metadata_not_properly_reset));
  87       }
  88    }
  89 }
  90 #endif