src/mesa/drivers/dri/i965/intel_asm_annotation.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
  24 #include "brw_cfg.h"
  25 #include "brw_eu.h"
  26 #include "intel_debug.h"
  27 #include "intel_asm_annotation.h"
  28 #include "glsl/nir/nir.h"
  29
  30 void
  31 dump_assembly(void *assembly, int num_annotations, struct annotation *annotation,
  32               const struct brw_device_info *devinfo)
  33 {
  34    const char *last_annotation_string = NULL;
  35    const void *last_annotation_ir = NULL;
  36
  37    for (int i = 0; i < num_annotations; i++) {
  38       int start_offset = annotation[i].offset;
  39       int end_offset = annotation[i + 1].offset;
  40
  41       if (annotation[i].block_start) {
  42          fprintf(stderr, "   START B%d", annotation[i].block_start->num);
  43          foreach_list_typed(struct bblock_link, predecessor_link, link,
  44                             &annotation[i].block_start->parents) {
  45             struct bblock_t *predecessor_block = predecessor_link->block;
  46             fprintf(stderr, " <-B%d", predecessor_block->num);
  47          }
  48          fprintf(stderr, "\n");
  49       }
  50
  51       if (last_annotation_ir != annotation[i].ir) {
  52          last_annotation_ir = annotation[i].ir;
  53          if (last_annotation_ir) {
  54             fprintf(stderr, "   ");
  55             nir_print_instr(annotation[i].ir, stderr);
  56             fprintf(stderr, "\n");
  57          }
  58       }
  59
  60       if (last_annotation_string != annotation[i].annotation) {
  61          last_annotation_string = annotation[i].annotation;
  62          if (last_annotation_string)
  63             fprintf(stderr, "   %s\n", last_annotation_string);
  64       }
  65
  66       brw_disassemble(devinfo, assembly, start_offset, end_offset, stderr);
  67
  68       if (annotation[i].error) {
  69          fputs(annotation[i].error, stderr);
  70       }
  71
  72       if (annotation[i].block_end) {
  73          fprintf(stderr, "   END B%d", annotation[i].block_end->num);
  74          foreach_list_typed(struct bblock_link, successor_link, link,
  75                             &annotation[i].block_end->children) {
  76             struct bblock_t *successor_block = successor_link->block;
  77             fprintf(stderr, " ->B%d", successor_block->num);
  78          }
  79          fprintf(stderr, "\n");
  80       }
  81    }
  82    fprintf(stderr, "\n");
  83 }
  84
  85 static bool
  86 annotation_array_ensure_space(struct annotation_info *annotation)
  87 {
  88    if (annotation->ann_size <= annotation->ann_count) {
  89       int old_size = annotation->ann_size;
  90       annotation->ann_size = MAX2(1024, annotation->ann_size * 2);
  91       annotation->ann = reralloc(annotation->mem_ctx, annotation->ann,
  92                                  struct annotation, annotation->ann_size);
  93       if (!annotation->ann)
  94          return false;
  95
  96       memset(annotation->ann + old_size, 0,
  97              (annotation->ann_size - old_size) * sizeof(struct annotation));
  98    }
  99
 100    return true;
 101 }
 102
 103 void annotate(const struct brw_device_info *devinfo,
 104               struct annotation_info *annotation, const struct cfg_t *cfg,
 105               struct backend_instruction *inst, unsigned offset)
 106 {
 107    if (annotation->mem_ctx == NULL)
 108       annotation->mem_ctx = ralloc_context(NULL);
 109
 110    if (!annotation_array_ensure_space(annotation))
 111       return;
 112
 113    struct annotation *ann = &annotation->ann[annotation->ann_count++];
 114    ann->offset = offset;
 115    if ((INTEL_DEBUG & DEBUG_ANNOTATION) != 0) {
 116       ann->ir = inst->ir;
 117       ann->annotation = inst->annotation;
 118    }
 119
 120    if (bblock_start(cfg->blocks[annotation->cur_block]) == inst) {
 121       ann->block_start = cfg->blocks[annotation->cur_block];
 122    }
 123
 124    if (bblock_end(cfg->blocks[annotation->cur_block]) == inst) {
 125       ann->block_end = cfg->blocks[annotation->cur_block];
 126       annotation->cur_block++;
 127    }
 128
 129    /* Merge this annotation with the previous if possible. */
 130    struct annotation *prev = annotation->ann_count > 1 ?
 131          &annotation->ann[annotation->ann_count - 2] : NULL;
 132    if (prev != NULL &&
 133        ann->ir == prev->ir &&
 134        ann->annotation == prev->annotation &&
 135        ann->block_start == NULL &&
 136        prev->block_end == NULL) {
 137       if (ann->block_end == NULL)
 138          annotation->ann_count--;
 139       return;
 140    }
 141
 142    /* There is no hardware DO instruction on Gen6+, so since DO always
 143     * starts a basic block, we need to set the .block_start of the next
 144     * instruction's annotation with a pointer to the bblock started by
 145     * the DO.
 146     *
 147     * There's also only complication from emitting an annotation without
 148     * a corresponding hardware instruction to disassemble.
 149     */
 150    if (devinfo->gen >= 6 && inst->opcode == BRW_OPCODE_DO) {
 151       annotation->ann_count--;
 152    }
 153 }
 154
 155 void
 156 annotation_finalize(struct annotation_info *annotation,
 157                     unsigned next_inst_offset)
 158 {
 159    if (!annotation->ann_count)
 160       return;
 161
 162    if (annotation->ann_count == annotation->ann_size) {
 163       annotation->ann = reralloc(annotation->mem_ctx, annotation->ann,
 164                                  struct annotation, annotation->ann_size + 1);
 165    }
 166    annotation->ann[annotation->ann_count].offset = next_inst_offset;
 167 }
 168
 169 void
 170 annotation_insert_error(struct annotation_info *annotation, unsigned offset,
 171                         const char *error)
 172 {
 173    struct annotation *ann;
 174
 175    if (!annotation->ann_count)
 176       return;
 177
 178    /* We may have to split an annotation, so ensure we have enough space
 179     * allocated for that case up front.
 180     */
 181    if (!annotation_array_ensure_space(annotation))
 182       return;
 183
 184    assume(annotation->ann_count > 0);
 185
 186    for (int i = 0; i < annotation->ann_count; i++) {
 187       struct annotation *cur = &annotation->ann[i];
 188       struct annotation *next = &annotation->ann[i + 1];
 189       ann = cur;
 190
 191       if (next->offset <= offset)
 192          continue;
 193
 194       if (offset + sizeof(brw_inst) != next->offset) {
 195          memmove(next, cur,
 196                  (annotation->ann_count - i + 2) * sizeof(struct annotation));
 197          cur->error = NULL;
 198          cur->error_length = 0;
 199          cur->block_end = NULL;
 200          next->offset = offset + sizeof(brw_inst);
 201          next->block_start = NULL;
 202          annotation->ann_count++;
 203       }
 204       break;
 205    }
 206
 207    if (ann->error)
 208       ralloc_strcat(&ann->error, error);
 209    else
 210       ann->error = ralloc_strdup(annotation->mem_ctx, error);
 211 }