1/*
2 * Copyright (C) 2021 Collabora, Ltd.
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 FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24#include "compiler.h"
25#include "util/u_memory.h"
26
27/* Validatation doesn't make sense in release builds */
28#ifndef NDEBUG
29
30/* Validate that all sources are initialized in all read components. This is
31 * required for correct register allocation. We check a weaker condition, that
32 * all sources that are read are written at some point (equivalently, the live
33 * set is empty at the start of the program). TODO: Strengthen */
34
35bool
36bi_validate_initialization(bi_context *ctx)
37{
38        bool success = true;
39
40        /* Calculate the live set */
41        bi_block *entry = bi_entry_block(ctx);
42        unsigned temp_count = bi_max_temp(ctx);
43        bi_invalidate_liveness(ctx);
44        bi_compute_liveness(ctx);
45
46        /* Validate that the live set is indeed empty */
47        for (unsigned i = 0; i < temp_count; ++i) {
48                if (entry->live_in[i] == 0) continue;
49
50                fprintf(stderr, "%s%u\n", (i & PAN_IS_REG) ? "r" : "", i >> 1);
51                success = false;
52        }
53
54        return success;
55}
56
57void
58bi_validate(bi_context *ctx, const char *after)
59{
60        bool fail = false;
61
62        if (bifrost_debug & BIFROST_DBG_NOVALIDATE)
63                return;
64
65        if (!bi_validate_initialization(ctx)) {
66                fprintf(stderr, "Uninitialized data read after %s\n", after);
67                fail = true;
68        }
69
70        /* TODO: Validate more invariants */
71
72        if (fail) {
73                bi_print_shader(ctx, stderr);
74                exit(1);
75        }
76}
77
78#endif /* NDEBUG */
79