src/glsl/ir_validate.cpp

   1 /*
   2  * Copyright © 2010 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
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file ir_validate.cpp
  26  *
  27  * Attempts to verify that various invariants of the IR tree are true.
  28  *
  29  * In particular, at the moment it makes sure that no single
  30  * ir_instruction node except for ir_variable appears multiple times
  31  * in the ir tree.  ir_variable does appear multiple times: Once as a
  32  * declaration in an exec_list, and multiple times as the endpoint of
  33  * a dereference chain.
  34  */
  35
  36 #include "ir.h"
  37 #include "ir_hierarchical_visitor.h"
  38 #include "util/hash_table.h"
  39 #include "util/set.h"
  40 #include "glsl_types.h"
  41
  42 namespace {
  43
  44 class ir_validate : public ir_hierarchical_visitor {
  45 public:
  46    ir_validate()
  47    {
  48       this->ir_set = _mesa_set_create(NULL, _mesa_hash_pointer,
  49                                       _mesa_key_pointer_equal);
  50
  51       this->current_function = NULL;
  52
  53       this->callback_enter = ir_validate::validate_ir;
  54       this->data_enter = ir_set;
  55    }
  56
  57    ~ir_validate()
  58    {
  59       _mesa_set_destroy(this->ir_set, NULL);
  60    }
  61
  62    virtual ir_visitor_status visit(ir_variable *v);
  63    virtual ir_visitor_status visit(ir_dereference_variable *ir);
  64
  65    virtual ir_visitor_status visit_enter(ir_discard *ir);
  66    virtual ir_visitor_status visit_enter(ir_if *ir);
  67
  68    virtual ir_visitor_status visit_enter(ir_function *ir);
  69    virtual ir_visitor_status visit_leave(ir_function *ir);
  70    virtual ir_visitor_status visit_enter(ir_function_signature *ir);
  71
  72    virtual ir_visitor_status visit_leave(ir_expression *ir);
  73    virtual ir_visitor_status visit_leave(ir_swizzle *ir);
  74
  75    virtual ir_visitor_status visit_enter(class ir_dereference_array *);
  76
  77    virtual ir_visitor_status visit_enter(ir_assignment *ir);
  78    virtual ir_visitor_status visit_enter(ir_call *ir);
  79
  80    static void validate_ir(ir_instruction *ir, void *data);
  81
  82    ir_function *current_function;
  83
  84    struct set *ir_set;
  85 };
  86
  87 } /* anonymous namespace */
  88
  89 ir_visitor_status
  90 ir_validate::visit(ir_dereference_variable *ir)
  91 {
  92    if ((ir->var == NULL) || (ir->var->as_variable() == NULL)) {
  93       printf("ir_dereference_variable @ %p does not specify a variable %p\n",
  94              (void *) ir, (void *) ir->var);
  95       abort();
  96    }
  97
  98    if (_mesa_set_search(ir_set, ir->var) == NULL) {
  99       printf("ir_dereference_variable @ %p specifies undeclared variable "
 100              "`%s' @ %p\n",
 101              (void *) ir, ir->var->name, (void *) ir->var);
 102       abort();
 103    }
 104
 105    this->validate_ir(ir, this->data_enter);
 106
 107    return visit_continue;
 108 }
 109
 110 ir_visitor_status
 111 ir_validate::visit_enter(class ir_dereference_array *ir)
 112 {
 113    if (!ir->array->type->is_array() && !ir->array->type->is_matrix() &&
 114       !ir->array->type->is_vector()) {
 115       printf("ir_dereference_array @ %p does not specify an array, a vector "
 116              "or a matrix\n",
 117              (void *) ir);
 118       ir->print();
 119       printf("\n");
 120       abort();
 121    }
 122
 123    if (!ir->array_index->type->is_scalar()) {
 124       printf("ir_dereference_array @ %p does not have scalar index: %s\n",
 125              (void *) ir, ir->array_index->type->name);
 126       abort();
 127    }
 128
 129    if (!ir->array_index->type->is_integer()) {
 130       printf("ir_dereference_array @ %p does not have integer index: %s\n",
 131              (void *) ir, ir->array_index->type->name);
 132       abort();
 133    }
 134
 135    return visit_continue;
 136 }
 137
 138 ir_visitor_status
 139 ir_validate::visit_enter(ir_discard *ir)
 140 {
 141    if (ir->condition && ir->condition->type != glsl_type::bool_type) {
 142       printf("ir_discard condition %s type instead of bool.\n",
 143              ir->condition->type->name);
 144       ir->print();
 145       printf("\n");
 146       abort();
 147    }
 148
 149    return visit_continue;
 150 }
 151
 152 ir_visitor_status
 153 ir_validate::visit_enter(ir_if *ir)
 154 {
 155    if (ir->condition->type != glsl_type::bool_type) {
 156       printf("ir_if condition %s type instead of bool.\n",
 157              ir->condition->type->name);
 158       ir->print();
 159       printf("\n");
 160       abort();
 161    }
 162
 163    return visit_continue;
 164 }
 165
 166
 167 ir_visitor_status
 168 ir_validate::visit_enter(ir_function *ir)
 169 {
 170    /* Function definitions cannot be nested.
 171     */
 172    if (this->current_function != NULL) {
 173       printf("Function definition nested inside another function "
 174              "definition:\n");
 175       printf("%s %p inside %s %p\n",
 176              ir->name, (void *) ir,
 177              this->current_function->name, (void *) this->current_function);
 178       abort();
 179    }
 180
 181    /* Store the current function hierarchy being traversed.  This is used
 182     * by the function signature visitor to ensure that the signatures are
 183     * linked with the correct functions.
 184     */
 185    this->current_function = ir;
 186
 187    this->validate_ir(ir, this->data_enter);
 188
 189    /* Verify that all of the things stored in the list of signatures are,
 190     * in fact, function signatures.
 191     */
 192    foreach_in_list(ir_instruction, sig, &ir->signatures) {
 193       if (sig->ir_type != ir_type_function_signature) {
 194          printf("Non-signature in signature list of function `%s'\n",
 195                 ir->name);
 196          abort();
 197       }
 198    }
 199
 200    return visit_continue;
 201 }
 202
 203 ir_visitor_status
 204 ir_validate::visit_leave(ir_function *ir)
 205 {
 206    assert(ralloc_parent(ir->name) == ir);
 207
 208    this->current_function = NULL;
 209    return visit_continue;
 210 }
 211
 212 ir_visitor_status
 213 ir_validate::visit_enter(ir_function_signature *ir)
 214 {
 215    if (this->current_function != ir->function()) {
 216       printf("Function signature nested inside wrong function "
 217              "definition:\n");
 218       printf("%p inside %s %p instead of %s %p\n",
 219              (void *) ir,
 220              this->current_function->name, (void *) this->current_function,
 221              ir->function_name(), (void *) ir->function());
 222       abort();
 223    }
 224
 225    if (ir->return_type == NULL) {
 226       printf("Function signature %p for function %s has NULL return type.\n",
 227              (void *) ir, ir->function_name());
 228       abort();
 229    }
 230
 231    this->validate_ir(ir, this->data_enter);
 232
 233    return visit_continue;
 234 }
 235
 236 ir_visitor_status
 237 ir_validate::visit_leave(ir_expression *ir)
 238 {
 239    switch (ir->operation) {
 240    case ir_unop_bit_not:
 241       assert(ir->operands[0]->type == ir->type);
 242       break;
 243    case ir_unop_logic_not:
 244       assert(ir->type->base_type == GLSL_TYPE_BOOL);
 245       assert(ir->operands[0]->type->base_type == GLSL_TYPE_BOOL);
 246       break;
 247
 248    case ir_unop_neg:
 249    case ir_unop_abs:
 250    case ir_unop_sign:
 251    case ir_unop_rcp:
 252    case ir_unop_rsq:
 253    case ir_unop_sqrt:
 254       assert(ir->type == ir->operands[0]->type);
 255       break;
 256
 257    case ir_unop_exp:
 258    case ir_unop_log:
 259    case ir_unop_exp2:
 260    case ir_unop_log2:
 261    case ir_unop_saturate:
 262       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
 263       assert(ir->type == ir->operands[0]->type);
 264       break;
 265
 266    case ir_unop_f2i:
 267       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
 268       assert(ir->type->base_type == GLSL_TYPE_INT);
 269       break;
 270    case ir_unop_f2u:
 271       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
 272       assert(ir->type->base_type == GLSL_TYPE_UINT);
 273       break;
 274    case ir_unop_i2f:
 275       assert(ir->operands[0]->type->base_type == GLSL_TYPE_INT);
 276       assert(ir->type->base_type == GLSL_TYPE_FLOAT);
 277       break;
 278    case ir_unop_f2b:
 279       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
 280       assert(ir->type->base_type == GLSL_TYPE_BOOL);
 281       break;
 282    case ir_unop_b2f:
 283       assert(ir->operands[0]->type->base_type == GLSL_TYPE_BOOL);
 284       assert(ir->type->base_type == GLSL_TYPE_FLOAT);
 285       break;
 286    case ir_unop_i2b:
 287       assert(ir->operands[0]->type->base_type == GLSL_TYPE_INT);
 288       assert(ir->type->base_type == GLSL_TYPE_BOOL);
 289       break;
 290    case ir_unop_b2i:
 291       assert(ir->operands[0]->type->base_type == GLSL_TYPE_BOOL);
 292       assert(ir->type->base_type == GLSL_TYPE_INT);
 293       break;
 294    case ir_unop_u2f:
 295       assert(ir->operands[0]->type->base_type == GLSL_TYPE_UINT);
 296       assert(ir->type->base_type == GLSL_TYPE_FLOAT);
 297       break;
 298    case ir_unop_i2u:
 299       assert(ir->operands[0]->type->base_type == GLSL_TYPE_INT);
 300       assert(ir->type->base_type == GLSL_TYPE_UINT);
 301       break;
 302    case ir_unop_u2i:
 303       assert(ir->operands[0]->type->base_type == GLSL_TYPE_UINT);
 304       assert(ir->type->base_type == GLSL_TYPE_INT);
 305       break;
 306    case ir_unop_bitcast_i2f:
 307       assert(ir->operands[0]->type->base_type == GLSL_TYPE_INT);
 308       assert(ir->type->base_type == GLSL_TYPE_FLOAT);
 309       break;
 310    case ir_unop_bitcast_f2i:
 311       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
 312       assert(ir->type->base_type == GLSL_TYPE_INT);
 313       break;
 314    case ir_unop_bitcast_u2f:
 315       assert(ir->operands[0]->type->base_type == GLSL_TYPE_UINT);
 316       assert(ir->type->base_type == GLSL_TYPE_FLOAT);
 317       break;
 318    case ir_unop_bitcast_f2u:
 319       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
 320       assert(ir->type->base_type == GLSL_TYPE_UINT);
 321       break;
 322
 323    case ir_unop_trunc:
 324    case ir_unop_round_even:
 325    case ir_unop_ceil:
 326    case ir_unop_floor:
 327    case ir_unop_fract:
 328       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT ||
 329              ir->operands[0]->type->base_type == GLSL_TYPE_DOUBLE);
 330       assert(ir->operands[0]->type == ir->type);
 331       break;
 332    case ir_unop_sin:
 333    case ir_unop_cos:
 334    case ir_unop_dFdx:
 335    case ir_unop_dFdx_coarse:
 336    case ir_unop_dFdx_fine:
 337    case ir_unop_dFdy:
 338    case ir_unop_dFdy_coarse:
 339    case ir_unop_dFdy_fine:
 340       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
 341       assert(ir->operands[0]->type == ir->type);
 342       break;
 343
 344    case ir_unop_pack_snorm_2x16:
 345    case ir_unop_pack_unorm_2x16:
 346    case ir_unop_pack_half_2x16:
 347       assert(ir->type == glsl_type::uint_type);
 348       assert(ir->operands[0]->type == glsl_type::vec2_type);
 349       break;
 350
 351    case ir_unop_pack_snorm_4x8:
 352    case ir_unop_pack_unorm_4x8:
 353       assert(ir->type == glsl_type::uint_type);
 354       assert(ir->operands[0]->type == glsl_type::vec4_type);
 355       break;
 356
 357    case ir_unop_pack_double_2x32:
 358       assert(ir->type == glsl_type::double_type);
 359       assert(ir->operands[0]->type == glsl_type::uvec2_type);
 360       break;
 361
 362    case ir_unop_unpack_snorm_2x16:
 363    case ir_unop_unpack_unorm_2x16:
 364    case ir_unop_unpack_half_2x16:
 365       assert(ir->type == glsl_type::vec2_type);
 366       assert(ir->operands[0]->type == glsl_type::uint_type);
 367       break;
 368
 369    case ir_unop_unpack_snorm_4x8:
 370    case ir_unop_unpack_unorm_4x8:
 371       assert(ir->type == glsl_type::vec4_type);
 372       assert(ir->operands[0]->type == glsl_type::uint_type);
 373       break;
 374
 375    case ir_unop_unpack_half_2x16_split_x:
 376    case ir_unop_unpack_half_2x16_split_y:
 377       assert(ir->type == glsl_type::float_type);
 378       assert(ir->operands[0]->type == glsl_type::uint_type);
 379       break;
 380
 381    case ir_unop_unpack_double_2x32:
 382       assert(ir->type == glsl_type::uvec2_type);
 383       assert(ir->operands[0]->type == glsl_type::double_type);
 384       break;
 385
 386    case ir_unop_bitfield_reverse:
 387       assert(ir->operands[0]->type == ir->type);
 388       assert(ir->type->is_integer());
 389       break;
 390
 391    case ir_unop_bit_count:
 392    case ir_unop_find_msb:
 393    case ir_unop_find_lsb:
 394       assert(ir->operands[0]->type->vector_elements == ir->type->vector_elements);
 395       assert(ir->operands[0]->type->is_integer());
 396       assert(ir->type->base_type == GLSL_TYPE_INT);
 397       break;
 398
 399    case ir_unop_noise:
 400       /* XXX what can we assert here? */
 401       break;
 402
 403    case ir_unop_interpolate_at_centroid:
 404       assert(ir->operands[0]->type == ir->type);
 405       assert(ir->operands[0]->type->is_float());
 406       break;
 407
 408    case ir_unop_get_buffer_size:
 409       assert(ir->type == glsl_type::int_type);
 410       assert(ir->operands[0]->type == glsl_type::uint_type);
 411       break;
 412
 413    case ir_unop_ssbo_unsized_array_length:
 414       assert(ir->type == glsl_type::int_type);
 415       assert(ir->operands[0]->type->is_array());
 416       assert(ir->operands[0]->type->is_unsized_array());
 417       break;
 418
 419    case ir_unop_d2f:
 420       assert(ir->operands[0]->type->base_type == GLSL_TYPE_DOUBLE);
 421       assert(ir->type->base_type == GLSL_TYPE_FLOAT);
 422       break;
 423    case ir_unop_f2d:
 424       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
 425       assert(ir->type->base_type == GLSL_TYPE_DOUBLE);
 426       break;
 427    case ir_unop_d2i:
 428       assert(ir->operands[0]->type->base_type == GLSL_TYPE_DOUBLE);
 429       assert(ir->type->base_type == GLSL_TYPE_INT);
 430       break;
 431    case ir_unop_i2d:
 432       assert(ir->operands[0]->type->base_type == GLSL_TYPE_INT);
 433       assert(ir->type->base_type == GLSL_TYPE_DOUBLE);
 434       break;
 435    case ir_unop_d2u:
 436       assert(ir->operands[0]->type->base_type == GLSL_TYPE_DOUBLE);
 437       assert(ir->type->base_type == GLSL_TYPE_UINT);
 438       break;
 439    case ir_unop_u2d:
 440       assert(ir->operands[0]->type->base_type == GLSL_TYPE_UINT);
 441       assert(ir->type->base_type == GLSL_TYPE_DOUBLE);
 442       break;
 443    case ir_unop_d2b:
 444       assert(ir->operands[0]->type->base_type == GLSL_TYPE_DOUBLE);
 445       assert(ir->type->base_type == GLSL_TYPE_BOOL);
 446       break;
 447
 448    case ir_unop_frexp_sig:
 449       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT ||
 450              ir->operands[0]->type->base_type == GLSL_TYPE_DOUBLE);
 451       assert(ir->type->base_type == GLSL_TYPE_DOUBLE);
 452       break;
 453    case ir_unop_frexp_exp:
 454       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT ||
 455              ir->operands[0]->type->base_type == GLSL_TYPE_DOUBLE);
 456       assert(ir->type->base_type == GLSL_TYPE_INT);
 457       break;
 458    case ir_unop_subroutine_to_int:
 459       assert(ir->operands[0]->type->base_type == GLSL_TYPE_SUBROUTINE);
 460       assert(ir->type->base_type == GLSL_TYPE_INT);
 461       break;
 462    case ir_binop_add:
 463    case ir_binop_sub:
 464    case ir_binop_mul:
 465    case ir_binop_div:
 466    case ir_binop_mod:
 467    case ir_binop_min:
 468    case ir_binop_max:
 469    case ir_binop_pow:
 470       assert(ir->operands[0]->type->base_type ==
 471              ir->operands[1]->type->base_type);
 472
 473       if (ir->operands[0]->type->is_scalar())
 474          assert(ir->operands[1]->type == ir->type);
 475       else if (ir->operands[1]->type->is_scalar())
 476          assert(ir->operands[0]->type == ir->type);
 477       else if (ir->operands[0]->type->is_vector() &&
 478                ir->operands[1]->type->is_vector()) {
 479          assert(ir->operands[0]->type == ir->operands[1]->type);
 480          assert(ir->operands[0]->type == ir->type);
 481       }
 482       break;
 483
 484    case ir_binop_imul_high:
 485       assert(ir->type == ir->operands[0]->type);
 486       assert(ir->type == ir->operands[1]->type);
 487       assert(ir->type->is_integer());
 488       break;
 489
 490    case ir_binop_carry:
 491    case ir_binop_borrow:
 492       assert(ir->type == ir->operands[0]->type);
 493       assert(ir->type == ir->operands[1]->type);
 494       assert(ir->type->base_type == GLSL_TYPE_UINT);
 495       break;
 496
 497    case ir_binop_less:
 498    case ir_binop_greater:
 499    case ir_binop_lequal:
 500    case ir_binop_gequal:
 501    case ir_binop_equal:
 502    case ir_binop_nequal:
 503       /* The semantics of the IR operators differ from the GLSL <, >, <=, >=,
 504        * ==, and != operators.  The IR operators perform a component-wise
 505        * comparison on scalar or vector types and return a boolean scalar or
 506        * vector type of the same size.
 507        */
 508       assert(ir->type->base_type == GLSL_TYPE_BOOL);
 509       assert(ir->operands[0]->type == ir->operands[1]->type);
 510       assert(ir->operands[0]->type->is_vector()
 511              || ir->operands[0]->type->is_scalar());
 512       assert(ir->operands[0]->type->vector_elements
 513              == ir->type->vector_elements);
 514       break;
 515
 516    case ir_binop_all_equal:
 517    case ir_binop_any_nequal:
 518       /* GLSL == and != operate on scalars, vectors, matrices and arrays, and
 519        * return a scalar boolean.  The IR matches that.
 520        */
 521       assert(ir->type == glsl_type::bool_type);
 522       assert(ir->operands[0]->type == ir->operands[1]->type);
 523       break;
 524
 525    case ir_binop_lshift:
 526    case ir_binop_rshift:
 527       assert(ir->operands[0]->type->is_integer() &&
 528              ir->operands[1]->type->is_integer());
 529       if (ir->operands[0]->type->is_scalar()) {
 530           assert(ir->operands[1]->type->is_scalar());
 531       }
 532       if (ir->operands[0]->type->is_vector() &&
 533           ir->operands[1]->type->is_vector()) {
 534           assert(ir->operands[0]->type->components() ==
 535                  ir->operands[1]->type->components());
 536       }
 537       assert(ir->type == ir->operands[0]->type);
 538       break;
 539
 540    case ir_binop_bit_and:
 541    case ir_binop_bit_xor:
 542    case ir_binop_bit_or:
 543        assert(ir->operands[0]->type->base_type ==
 544               ir->operands[1]->type->base_type);
 545        assert(ir->type->is_integer());
 546        if (ir->operands[0]->type->is_vector() &&
 547            ir->operands[1]->type->is_vector()) {
 548            assert(ir->operands[0]->type->vector_elements ==
 549                   ir->operands[1]->type->vector_elements);
 550        }
 551        break;
 552
 553    case ir_binop_logic_and:
 554    case ir_binop_logic_xor:
 555    case ir_binop_logic_or:
 556       assert(ir->type->base_type == GLSL_TYPE_BOOL);
 557       assert(ir->operands[0]->type->base_type == GLSL_TYPE_BOOL);
 558       assert(ir->operands[1]->type->base_type == GLSL_TYPE_BOOL);
 559       break;
 560
 561    case ir_binop_dot:
 562       assert(ir->type == glsl_type::float_type ||
 563              ir->type == glsl_type::double_type);
 564       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT ||
 565              ir->operands[0]->type->base_type == GLSL_TYPE_DOUBLE);
 566       assert(ir->operands[0]->type->is_vector());
 567       assert(ir->operands[0]->type == ir->operands[1]->type);
 568       break;
 569
 570    case ir_binop_pack_half_2x16_split:
 571       assert(ir->type == glsl_type::uint_type);
 572       assert(ir->operands[0]->type == glsl_type::float_type);
 573       assert(ir->operands[1]->type == glsl_type::float_type);
 574       break;
 575
 576    case ir_binop_ubo_load:
 577       assert(ir->operands[0]->type == glsl_type::uint_type);
 578
 579       assert(ir->operands[1]->type == glsl_type::uint_type);
 580       break;
 581
 582    case ir_binop_ldexp:
 583       assert(ir->operands[0]->type == ir->type);
 584       assert(ir->operands[0]->type->is_float() ||
 585              ir->operands[0]->type->is_double());
 586       assert(ir->operands[1]->type->base_type == GLSL_TYPE_INT);
 587       assert(ir->operands[0]->type->components() ==
 588              ir->operands[1]->type->components());
 589       break;
 590
 591    case ir_binop_vector_extract:
 592       assert(ir->operands[0]->type->is_vector());
 593       assert(ir->operands[1]->type->is_scalar()
 594              && ir->operands[1]->type->is_integer());
 595       break;
 596
 597    case ir_binop_interpolate_at_offset:
 598       assert(ir->operands[0]->type == ir->type);
 599       assert(ir->operands[0]->type->is_float());
 600       assert(ir->operands[1]->type->components() == 2);
 601       assert(ir->operands[1]->type->is_float());
 602       break;
 603
 604    case ir_binop_interpolate_at_sample:
 605       assert(ir->operands[0]->type == ir->type);
 606       assert(ir->operands[0]->type->is_float());
 607       assert(ir->operands[1]->type == glsl_type::int_type);
 608       break;
 609
 610    case ir_triop_fma:
 611       assert(ir->type->base_type == GLSL_TYPE_FLOAT ||
 612              ir->type->base_type == GLSL_TYPE_DOUBLE);
 613       assert(ir->type == ir->operands[0]->type);
 614       assert(ir->type == ir->operands[1]->type);
 615       assert(ir->type == ir->operands[2]->type);
 616       break;
 617
 618    case ir_triop_lrp:
 619       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT ||
 620              ir->operands[0]->type->base_type == GLSL_TYPE_DOUBLE);
 621       assert(ir->operands[0]->type == ir->operands[1]->type);
 622       assert(ir->operands[2]->type == ir->operands[0]->type ||
 623              ir->operands[2]->type == glsl_type::float_type ||
 624              ir->operands[2]->type == glsl_type::double_type);
 625       break;
 626
 627    case ir_triop_csel:
 628       assert(ir->operands[0]->type->base_type == GLSL_TYPE_BOOL);
 629       assert(ir->type->vector_elements == ir->operands[0]->type->vector_elements);
 630       assert(ir->type == ir->operands[1]->type);
 631       assert(ir->type == ir->operands[2]->type);
 632       break;
 633
 634    case ir_triop_bitfield_extract:
 635       assert(ir->operands[0]->type == ir->type);
 636       assert(ir->operands[1]->type == glsl_type::int_type);
 637       assert(ir->operands[2]->type == glsl_type::int_type);
 638       break;
 639
 640    case ir_triop_vector_insert:
 641       assert(ir->operands[0]->type->is_vector());
 642       assert(ir->operands[1]->type->is_scalar());
 643       assert(ir->operands[0]->type->base_type == ir->operands[1]->type->base_type);
 644       assert(ir->operands[2]->type->is_scalar()
 645              && ir->operands[2]->type->is_integer());
 646       assert(ir->type == ir->operands[0]->type);
 647       break;
 648
 649    case ir_quadop_bitfield_insert:
 650       assert(ir->type->is_integer());
 651       assert(ir->operands[0]->type == ir->type);
 652       assert(ir->operands[1]->type == ir->type);
 653       assert(ir->operands[2]->type == ir->type);
 654       assert(ir->operands[3]->type == ir->type);
 655       break;
 656
 657    case ir_quadop_vector:
 658       /* The vector operator collects some number of scalars and generates a
 659        * vector from them.
 660        *
 661        *  - All of the operands must be scalar.
 662        *  - Number of operands must matche the size of the resulting vector.
 663        *  - Base type of the operands must match the base type of the result.
 664        */
 665       assert(ir->type->is_vector());
 666       switch (ir->type->vector_elements) {
 667       case 2:
 668          assert(ir->operands[0]->type->is_scalar());
 669          assert(ir->operands[0]->type->base_type == ir->type->base_type);
 670          assert(ir->operands[1]->type->is_scalar());
 671          assert(ir->operands[1]->type->base_type == ir->type->base_type);
 672          assert(ir->operands[2] == NULL);
 673          assert(ir->operands[3] == NULL);
 674          break;
 675       case 3:
 676          assert(ir->operands[0]->type->is_scalar());
 677          assert(ir->operands[0]->type->base_type == ir->type->base_type);
 678          assert(ir->operands[1]->type->is_scalar());
 679          assert(ir->operands[1]->type->base_type == ir->type->base_type);
 680          assert(ir->operands[2]->type->is_scalar());
 681          assert(ir->operands[2]->type->base_type == ir->type->base_type);
 682          assert(ir->operands[3] == NULL);
 683          break;
 684       case 4:
 685          assert(ir->operands[0]->type->is_scalar());
 686          assert(ir->operands[0]->type->base_type == ir->type->base_type);
 687          assert(ir->operands[1]->type->is_scalar());
 688          assert(ir->operands[1]->type->base_type == ir->type->base_type);
 689          assert(ir->operands[2]->type->is_scalar());
 690          assert(ir->operands[2]->type->base_type == ir->type->base_type);
 691          assert(ir->operands[3]->type->is_scalar());
 692          assert(ir->operands[3]->type->base_type == ir->type->base_type);
 693          break;
 694       default:
 695          /* The is_vector assertion above should prevent execution from ever
 696           * getting here.
 697           */
 698          assert(!"Should not get here.");
 699          break;
 700       }
 701    }
 702
 703    return visit_continue;
 704 }
 705
 706 ir_visitor_status
 707 ir_validate::visit_leave(ir_swizzle *ir)
 708 {
 709    unsigned int chans[4] = {ir->mask.x, ir->mask.y, ir->mask.z, ir->mask.w};
 710
 711    for (unsigned int i = 0; i < ir->type->vector_elements; i++) {
 712       if (chans[i] >= ir->val->type->vector_elements) {
 713          printf("ir_swizzle @ %p specifies a channel not present "
 714                 "in the value.\n", (void *) ir);
 715          ir->print();
 716          abort();
 717       }
 718    }
 719
 720    return visit_continue;
 721 }
 722
 723 ir_visitor_status
 724 ir_validate::visit(ir_variable *ir)
 725 {
 726    /* An ir_variable is the one thing that can (and will) appear multiple times
 727     * in an IR tree.  It is added to the hashtable so that it can be used
 728     * in the ir_dereference_variable handler to ensure that a variable is
 729     * declared before it is dereferenced.
 730     */
 731    if (ir->name && ir->is_name_ralloced())
 732       assert(ralloc_parent(ir->name) == ir);
 733
 734    _mesa_set_add(ir_set, ir);
 735
 736    /* If a variable is an array, verify that the maximum array index is in
 737     * bounds.  There was once an error in AST-to-HIR conversion that set this
 738     * to be out of bounds.
 739     */
 740    if (ir->type->array_size() > 0) {
 741       if (ir->data.max_array_access >= ir->type->length) {
 742          printf("ir_variable has maximum access out of bounds (%d vs %d)\n",
 743                 ir->data.max_array_access, ir->type->length - 1);
 744          ir->print();
 745          abort();
 746       }
 747    }
 748
 749    /* If a variable is an interface block (or an array of interface blocks),
 750     * verify that the maximum array index for each interface member is in
 751     * bounds.
 752     */
 753    if (ir->is_interface_instance()) {
 754       const glsl_struct_field *fields =
 755          ir->get_interface_type()->fields.structure;
 756       for (unsigned i = 0; i < ir->get_interface_type()->length; i++) {
 757          if (fields[i].type->array_size() > 0) {
 758             const unsigned *const max_ifc_array_access =
 759                ir->get_max_ifc_array_access();
 760
 761             assert(max_ifc_array_access != NULL);
 762
 763             if (max_ifc_array_access[i] >= fields[i].type->length) {
 764                printf("ir_variable has maximum access out of bounds for "
 765                       "field %s (%d vs %d)\n", fields[i].name,
 766                       max_ifc_array_access[i], fields[i].type->length);
 767                ir->print();
 768                abort();
 769             }
 770          }
 771       }
 772    }
 773
 774    if (ir->constant_initializer != NULL && !ir->data.has_initializer) {
 775       printf("ir_variable didn't have an initializer, but has a constant "
 776              "initializer value.\n");
 777       ir->print();
 778       abort();
 779    }
 780
 781    if (ir->data.mode == ir_var_uniform
 782        && is_gl_identifier(ir->name)
 783        && ir->get_state_slots() == NULL) {
 784       printf("built-in uniform has no state\n");
 785       ir->print();
 786       abort();
 787    }
 788
 789    return visit_continue;
 790 }
 791
 792 ir_visitor_status
 793 ir_validate::visit_enter(ir_assignment *ir)
 794 {
 795    const ir_dereference *const lhs = ir->lhs;
 796    if (lhs->type->is_scalar() || lhs->type->is_vector()) {
 797       if (ir->write_mask == 0) {
 798          printf("Assignment LHS is %s, but write mask is 0:\n",
 799                 lhs->type->is_scalar() ? "scalar" : "vector");
 800          ir->print();
 801          abort();
 802       }
 803
 804       int lhs_components = 0;
 805       for (int i = 0; i < 4; i++) {
 806          if (ir->write_mask & (1 << i))
 807             lhs_components++;
 808       }
 809
 810       if (lhs_components != ir->rhs->type->vector_elements) {
 811          printf("Assignment count of LHS write mask channels enabled not\n"
 812                 "matching RHS vector size (%d LHS, %d RHS).\n",
 813                 lhs_components, ir->rhs->type->vector_elements);
 814          ir->print();
 815          abort();
 816       }
 817    }
 818
 819    this->validate_ir(ir, this->data_enter);
 820
 821    return visit_continue;
 822 }
 823
 824 ir_visitor_status
 825 ir_validate::visit_enter(ir_call *ir)
 826 {
 827    ir_function_signature *const callee = ir->callee;
 828
 829    if (callee->ir_type != ir_type_function_signature) {
 830       printf("IR called by ir_call is not ir_function_signature!\n");
 831       abort();
 832    }
 833
 834    if (ir->return_deref) {
 835       if (ir->return_deref->type != callee->return_type) {
 836          printf("callee type %s does not match return storage type %s\n",
 837                 callee->return_type->name, ir->return_deref->type->name);
 838          abort();
 839       }
 840    } else if (callee->return_type != glsl_type::void_type) {
 841       printf("ir_call has non-void callee but no return storage\n");
 842       abort();
 843    }
 844
 845    const exec_node *formal_param_node = callee->parameters.head;
 846    const exec_node *actual_param_node = ir->actual_parameters.head;
 847    while (true) {
 848       if (formal_param_node->is_tail_sentinel()
 849           != actual_param_node->is_tail_sentinel()) {
 850          printf("ir_call has the wrong number of parameters:\n");
 851          goto dump_ir;
 852       }
 853       if (formal_param_node->is_tail_sentinel()) {
 854          break;
 855       }
 856       const ir_variable *formal_param
 857          = (const ir_variable *) formal_param_node;
 858       const ir_rvalue *actual_param
 859          = (const ir_rvalue *) actual_param_node;
 860       if (formal_param->type != actual_param->type) {
 861          printf("ir_call parameter type mismatch:\n");
 862          goto dump_ir;
 863       }
 864       if (formal_param->data.mode == ir_var_function_out
 865           || formal_param->data.mode == ir_var_function_inout) {
 866          if (!actual_param->is_lvalue()) {
 867             printf("ir_call out/inout parameters must be lvalues:\n");
 868             goto dump_ir;
 869          }
 870       }
 871       formal_param_node = formal_param_node->next;
 872       actual_param_node = actual_param_node->next;
 873    }
 874
 875    return visit_continue;
 876
 877 dump_ir:
 878    ir->print();
 879    printf("callee:\n");
 880    callee->print();
 881    abort();
 882    return visit_stop;
 883 }
 884
 885 void
 886 ir_validate::validate_ir(ir_instruction *ir, void *data)
 887 {
 888    struct set *ir_set = (struct set *) data;
 889
 890    if (_mesa_set_search(ir_set, ir)) {
 891       printf("Instruction node present twice in ir tree:\n");
 892       ir->print();
 893       printf("\n");
 894       abort();
 895    }
 896    _mesa_set_add(ir_set, ir);
 897 }
 898
 899 void
 900 check_node_type(ir_instruction *ir, void *data)
 901 {
 902    (void) data;
 903
 904    if (ir->ir_type >= ir_type_max) {
 905       printf("Instruction node with unset type\n");
 906       ir->print(); printf("\n");
 907    }
 908    ir_rvalue *value = ir->as_rvalue();
 909    if (value != NULL)
 910       assert(value->type != glsl_type::error_type);
 911 }
 912
 913 void
 914 validate_ir_tree(exec_list *instructions)
 915 {
 916    /* We shouldn't have any reason to validate IR in a release build,
 917     * and it's half composed of assert()s anyway which wouldn't do
 918     * anything.
 919     */
 920 #ifdef DEBUG
 921    ir_validate v;
 922
 923    v.run(instructions);
 924
 925    foreach_in_list(ir_instruction, ir, instructions) {
 926       visit_tree(ir, check_node_type, NULL);
 927    }
 928 #endif
 929 }