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 <inttypes.h>
  37 #include "ir.h"
  38 #include "ir_hierarchical_visitor.h"
  39 #include "program/hash_table.h"
  40 #include "glsl_types.h"
  41
  42 class ir_validate : public ir_hierarchical_visitor {
  43 public:
  44    ir_validate()
  45    {
  46       this->ht = hash_table_ctor(0, hash_table_pointer_hash,
  47                                  hash_table_pointer_compare);
  48
  49       this->current_function = NULL;
  50
  51       this->callback = ir_validate::validate_ir;
  52       this->data = ht;
  53    }
  54
  55    ~ir_validate()
  56    {
  57       hash_table_dtor(this->ht);
  58    }
  59
  60    virtual ir_visitor_status visit(ir_variable *v);
  61    virtual ir_visitor_status visit(ir_dereference_variable *ir);
  62    virtual ir_visitor_status visit(ir_if *ir);
  63
  64    virtual ir_visitor_status visit_leave(ir_loop *ir);
  65    virtual ir_visitor_status visit_enter(ir_function *ir);
  66    virtual ir_visitor_status visit_leave(ir_function *ir);
  67    virtual ir_visitor_status visit_enter(ir_function_signature *ir);
  68
  69    virtual ir_visitor_status visit_leave(ir_expression *ir);
  70
  71    virtual ir_visitor_status visit_enter(ir_assignment *ir);
  72
  73    static void validate_ir(ir_instruction *ir, void *data);
  74
  75    ir_function *current_function;
  76
  77    struct hash_table *ht;
  78 };
  79
  80
  81 ir_visitor_status
  82 ir_validate::visit(ir_dereference_variable *ir)
  83 {
  84    if ((ir->var == NULL) || (ir->var->as_variable() == NULL)) {
  85       printf("ir_dereference_variable @ %p does not specify a variable %p\n",
  86              (void *) ir, (void *) ir->var);
  87       abort();
  88    }
  89
  90    if (hash_table_find(ht, ir->var) == NULL) {
  91       printf("ir_dereference_variable @ %p specifies undeclared variable "
  92              "`%s' @ %p\n",
  93              (void *) ir, ir->var->name, (void *) ir->var);
  94       abort();
  95    }
  96
  97    this->validate_ir(ir, this->data);
  98
  99    return visit_continue;
 100 }
 101
 102 ir_visitor_status
 103 ir_validate::visit(ir_if *ir)
 104 {
 105    if (ir->condition->type != glsl_type::bool_type) {
 106       printf("ir_if condition %s type instead of bool.\n",
 107              ir->condition->type->name);
 108       ir->print();
 109       printf("\n");
 110       abort();
 111    }
 112
 113    return visit_continue;
 114 }
 115
 116
 117 ir_visitor_status
 118 ir_validate::visit_leave(ir_loop *ir)
 119 {
 120    if (ir->counter != NULL) {
 121       if ((ir->from == NULL) || (ir->from == NULL) || (ir->increment == NULL)) {
 122          printf("ir_loop has invalid loop controls:\n"
 123                 "    counter:   %p\n"
 124                 "    from:      %p\n"
 125                 "    to:        %p\n"
 126                 "    increment: %p\n",
 127                 ir->counter, ir->from, ir->to, ir->increment);
 128          abort();
 129       }
 130
 131       if ((ir->cmp < ir_binop_less) || (ir->cmp > ir_binop_nequal)) {
 132          printf("ir_loop has invalid comparitor %d\n", ir->cmp);
 133          abort();
 134       }
 135    } else {
 136       if ((ir->from != NULL) || (ir->from != NULL) || (ir->increment != NULL)) {
 137          printf("ir_loop has invalid loop controls:\n"
 138                 "    counter:   %p\n"
 139                 "    from:      %p\n"
 140                 "    to:        %p\n"
 141                 "    increment: %p\n",
 142                 ir->counter, ir->from, ir->to, ir->increment);
 143          abort();
 144       }
 145    }
 146
 147    return visit_continue;
 148 }
 149
 150
 151 ir_visitor_status
 152 ir_validate::visit_enter(ir_function *ir)
 153 {
 154    /* Function definitions cannot be nested.
 155     */
 156    if (this->current_function != NULL) {
 157       printf("Function definition nested inside another function "
 158              "definition:\n");
 159       printf("%s %p inside %s %p\n",
 160              ir->name, (void *) ir,
 161              this->current_function->name, (void *) this->current_function);
 162       abort();
 163    }
 164
 165    /* Store the current function hierarchy being traversed.  This is used
 166     * by the function signature visitor to ensure that the signatures are
 167     * linked with the correct functions.
 168     */
 169    this->current_function = ir;
 170
 171    this->validate_ir(ir, this->data);
 172
 173    return visit_continue;
 174 }
 175
 176 ir_visitor_status
 177 ir_validate::visit_leave(ir_function *ir)
 178 {
 179    assert(talloc_parent(ir->name) == ir);
 180
 181    this->current_function = NULL;
 182    return visit_continue;
 183 }
 184
 185 ir_visitor_status
 186 ir_validate::visit_enter(ir_function_signature *ir)
 187 {
 188    if (this->current_function != ir->function()) {
 189       printf("Function signature nested inside wrong function "
 190              "definition:\n");
 191       printf("%p inside %s %p instead of %s %p\n",
 192              (void *) ir,
 193              this->current_function->name, (void *) this->current_function,
 194              ir->function_name(), (void *) ir->function());
 195       abort();
 196    }
 197
 198    this->validate_ir(ir, this->data);
 199
 200    return visit_continue;
 201 }
 202
 203 ir_visitor_status
 204 ir_validate::visit_leave(ir_expression *ir)
 205 {
 206    switch (ir->operation) {
 207    case ir_unop_bit_not:
 208       assert(ir->operands[0]->type == ir->type);
 209       break;
 210    case ir_unop_logic_not:
 211       assert(ir->type->base_type == GLSL_TYPE_BOOL);
 212       assert(ir->operands[0]->type->base_type == GLSL_TYPE_BOOL);
 213       break;
 214
 215    case ir_unop_neg:
 216    case ir_unop_abs:
 217    case ir_unop_sign:
 218    case ir_unop_rcp:
 219    case ir_unop_rsq:
 220    case ir_unop_sqrt:
 221       assert(ir->type == ir->operands[0]->type);
 222       break;
 223
 224    case ir_unop_exp:
 225    case ir_unop_log:
 226    case ir_unop_exp2:
 227    case ir_unop_log2:
 228       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
 229       assert(ir->type == ir->operands[0]->type);
 230       break;
 231
 232    case ir_unop_f2i:
 233       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
 234       assert(ir->type->base_type == GLSL_TYPE_INT);
 235       break;
 236    case ir_unop_i2f:
 237       assert(ir->operands[0]->type->base_type == GLSL_TYPE_INT);
 238       assert(ir->type->base_type == GLSL_TYPE_FLOAT);
 239       break;
 240    case ir_unop_f2b:
 241       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
 242       assert(ir->type->base_type == GLSL_TYPE_BOOL);
 243       break;
 244    case ir_unop_b2f:
 245       assert(ir->operands[0]->type->base_type == GLSL_TYPE_BOOL);
 246       assert(ir->type->base_type == GLSL_TYPE_FLOAT);
 247       break;
 248    case ir_unop_i2b:
 249       assert(ir->operands[0]->type->base_type == GLSL_TYPE_INT);
 250       assert(ir->type->base_type == GLSL_TYPE_BOOL);
 251       break;
 252    case ir_unop_b2i:
 253       assert(ir->operands[0]->type->base_type == GLSL_TYPE_BOOL);
 254       assert(ir->type->base_type == GLSL_TYPE_INT);
 255       break;
 256    case ir_unop_u2f:
 257       assert(ir->operands[0]->type->base_type == GLSL_TYPE_UINT);
 258       assert(ir->type->base_type == GLSL_TYPE_FLOAT);
 259       break;
 260
 261    case ir_unop_any:
 262       assert(ir->operands[0]->type->base_type == GLSL_TYPE_BOOL);
 263       assert(ir->type == glsl_type::bool_type);
 264       break;
 265
 266    case ir_unop_trunc:
 267    case ir_unop_ceil:
 268    case ir_unop_floor:
 269    case ir_unop_fract:
 270    case ir_unop_sin:
 271    case ir_unop_cos:
 272    case ir_unop_dFdx:
 273    case ir_unop_dFdy:
 274       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
 275       assert(ir->operands[0]->type == ir->type);
 276       break;
 277
 278    case ir_binop_add:
 279    case ir_binop_sub:
 280    case ir_binop_mul:
 281    case ir_binop_div:
 282    case ir_binop_mod:
 283    case ir_binop_min:
 284    case ir_binop_max:
 285    case ir_binop_pow:
 286       if (ir->operands[0]->type->is_scalar())
 287          assert(ir->operands[1]->type == ir->type);
 288       else if (ir->operands[1]->type->is_scalar())
 289          assert(ir->operands[0]->type == ir->type);
 290       else if (ir->operands[0]->type->is_vector() &&
 291                ir->operands[1]->type->is_vector()) {
 292          assert(ir->operands[0]->type == ir->operands[1]->type);
 293          assert(ir->operands[0]->type == ir->type);
 294       }
 295       break;
 296    case ir_binop_less:
 297    case ir_binop_greater:
 298    case ir_binop_lequal:
 299    case ir_binop_gequal:
 300       /* GLSL < > <= >= operators take scalar floats/ints, but in the
 301        * IR we may want to do them for vectors instead to support the
 302        * lessEqual() and friends builtins.
 303        */
 304       assert(ir->type == glsl_type::bool_type);
 305       assert(ir->operands[0]->type == ir->operands[1]->type);
 306       break;
 307
 308    case ir_binop_equal:
 309    case ir_binop_nequal:
 310       /* GLSL == and != operate on vectors and return a bool, and the
 311        * IR matches that.  We may want to switch up the IR to work on
 312        * vectors and return a bvec and make the operators break down
 313        * to ANDing/ORing the results of the vector comparison.
 314        */
 315       assert(ir->type == glsl_type::bool_type);
 316       assert(ir->operands[0]->type == ir->operands[1]->type);
 317       break;
 318
 319    case ir_binop_lshift:
 320    case ir_binop_rshift:
 321    case ir_binop_bit_and:
 322    case ir_binop_bit_xor:
 323    case ir_binop_bit_or:
 324       assert(ir->operands[0]->type == ir->operands[1]->type);
 325       assert(ir->type == ir->operands[0]->type);
 326       assert(ir->type->base_type == GLSL_TYPE_INT ||
 327              ir->type->base_type == GLSL_TYPE_UINT);
 328       break;
 329
 330    case ir_binop_logic_and:
 331    case ir_binop_logic_xor:
 332    case ir_binop_logic_or:
 333       assert(ir->type == glsl_type::bool_type);
 334       assert(ir->operands[0]->type == glsl_type::bool_type);
 335       assert(ir->operands[1]->type == glsl_type::bool_type);
 336       break;
 337
 338    case ir_binop_dot:
 339       assert(ir->type == glsl_type::float_type);
 340       assert(ir->operands[0]->type->base_type == GLSL_TYPE_FLOAT);
 341       assert(ir->operands[0]->type == ir->operands[1]->type);
 342       break;
 343
 344    case ir_binop_cross:
 345       assert(ir->operands[0]->type == glsl_type::vec3_type);
 346       assert(ir->operands[1]->type == glsl_type::vec3_type);
 347       assert(ir->type == glsl_type::vec3_type);
 348       break;
 349    }
 350
 351    return visit_continue;
 352 }
 353
 354 ir_visitor_status
 355 ir_validate::visit(ir_variable *ir)
 356 {
 357    /* An ir_variable is the one thing that can (and will) appear multiple times
 358     * in an IR tree.  It is added to the hashtable so that it can be used
 359     * in the ir_dereference_variable handler to ensure that a variable is
 360     * declared before it is dereferenced.
 361     */
 362    if (ir->name)
 363       assert(talloc_parent(ir->name) == ir);
 364
 365    hash_table_insert(ht, ir, ir);
 366    return visit_continue;
 367 }
 368
 369 ir_visitor_status
 370 ir_validate::visit_enter(ir_assignment *ir)
 371 {
 372    const ir_dereference *const lhs = ir->lhs;
 373    if (lhs->type->is_scalar() || lhs->type->is_vector()) {
 374       if (ir->write_mask == 0) {
 375          printf("Assignment LHS is %s, but write mask is 0:\n",
 376                 lhs->type->is_scalar() ? "scalar" : "vector");
 377          ir->print();
 378          abort();
 379       }
 380
 381       /* Mask of fields that do not exist in the destination.  These should
 382        * not be written by the assignment.
 383        */
 384       const unsigned invalid_mask = ~((1U << lhs->type->components()) - 1);
 385
 386       if ((invalid_mask & ir->write_mask) != 0) {
 387          printf("Assignment write mask enables invalid components for "
 388                 "type %s:\n", lhs->type->name);
 389          ir->print();
 390          abort();
 391       }
 392    }
 393
 394    this->validate_ir(ir, this->data);
 395
 396    return visit_continue;
 397 }
 398
 399 void
 400 ir_validate::validate_ir(ir_instruction *ir, void *data)
 401 {
 402    struct hash_table *ht = (struct hash_table *) data;
 403
 404    if (hash_table_find(ht, ir)) {
 405       printf("Instruction node present twice in ir tree:\n");
 406       ir->print();
 407       printf("\n");
 408       abort();
 409    }
 410    hash_table_insert(ht, ir, ir);
 411 }
 412
 413 void
 414 check_node_type(ir_instruction *ir, void *data)
 415 {
 416    (void) data;
 417
 418    if (ir->ir_type <= ir_type_unset || ir->ir_type >= ir_type_max) {
 419       printf("Instruction node with unset type\n");
 420       ir->print(); printf("\n");
 421    }
 422    assert(ir->type != glsl_type::error_type);
 423 }
 424
 425 void
 426 validate_ir_tree(exec_list *instructions)
 427 {
 428    ir_validate v;
 429
 430    v.run(instructions);
 431
 432    foreach_iter(exec_list_iterator, iter, *instructions) {
 433       ir_instruction *ir = (ir_instruction *)iter.get();
 434
 435       visit_tree(ir, check_node_type, NULL);
 436    }
 437 }