src/glsl/glsl_parser_extras.cpp

   1 /*
   2  * Copyright © 2008, 2009 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 #include <stdio.h>
  24 #include <stdarg.h>
  25 #include <string.h>
  26 #include <assert.h>
  27
  28 extern "C" {
  29 #include <talloc.h>
  30 #include "main/core.h" /* for struct gl_context */
  31 }
  32
  33 #include "ast.h"
  34 #include "glsl_parser_extras.h"
  35 #include "glsl_parser.h"
  36 #include "ir_optimization.h"
  37 #include "loop_analysis.h"
  38
  39 _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *ctx,
  40                                                GLenum target, void *mem_ctx)
  41 {
  42    switch (target) {
  43    case GL_VERTEX_SHADER:   this->target = vertex_shader; break;
  44    case GL_FRAGMENT_SHADER: this->target = fragment_shader; break;
  45    case GL_GEOMETRY_SHADER: this->target = geometry_shader; break;
  46    }
  47
  48    this->scanner = NULL;
  49    this->translation_unit.make_empty();
  50    this->symbols = new(mem_ctx) glsl_symbol_table;
  51    this->info_log = talloc_strdup(mem_ctx, "");
  52    this->error = false;
  53    this->loop_or_switch_nesting = NULL;
  54
  55    /* Set default language version and extensions */
  56    this->language_version = 110;
  57    this->es_shader = false;
  58    this->ARB_texture_rectangle_enable = true;
  59
  60    /* OpenGL ES 2.0 has different defaults from desktop GL. */
  61    if (ctx->API == API_OPENGLES2) {
  62       this->language_version = 100;
  63       this->es_shader = true;
  64       this->ARB_texture_rectangle_enable = false;
  65    }
  66
  67    this->extensions = &ctx->Extensions;
  68
  69    this->Const.MaxLights = ctx->Const.MaxLights;
  70    this->Const.MaxClipPlanes = ctx->Const.MaxClipPlanes;
  71    this->Const.MaxTextureUnits = ctx->Const.MaxTextureUnits;
  72    this->Const.MaxTextureCoords = ctx->Const.MaxTextureCoordUnits;
  73    this->Const.MaxVertexAttribs = ctx->Const.VertexProgram.MaxAttribs;
  74    this->Const.MaxVertexUniformComponents = ctx->Const.VertexProgram.MaxUniformComponents;
  75    this->Const.MaxVaryingFloats = ctx->Const.MaxVarying * 4;
  76    this->Const.MaxVertexTextureImageUnits = ctx->Const.MaxVertexTextureImageUnits;
  77    this->Const.MaxCombinedTextureImageUnits = ctx->Const.MaxCombinedTextureImageUnits;
  78    this->Const.MaxTextureImageUnits = ctx->Const.MaxTextureImageUnits;
  79    this->Const.MaxFragmentUniformComponents = ctx->Const.FragmentProgram.MaxUniformComponents;
  80
  81    this->Const.MaxDrawBuffers = ctx->Const.MaxDrawBuffers;
  82 }
  83
  84 const char *
  85 _mesa_glsl_shader_target_name(enum _mesa_glsl_parser_targets target)
  86 {
  87    switch (target) {
  88    case vertex_shader:   return "vertex";
  89    case fragment_shader: return "fragment";
  90    case geometry_shader: return "geometry";
  91    }
  92
  93    assert(!"Should not get here.");
  94    return "unknown";
  95 }
  96
  97
  98 void
  99 _mesa_glsl_error(YYLTYPE *locp, _mesa_glsl_parse_state *state,
 100                  const char *fmt, ...)
 101 {
 102    va_list ap;
 103
 104    state->error = true;
 105
 106    assert(state->info_log != NULL);
 107    state->info_log = talloc_asprintf_append(state->info_log,
 108                                             "%u:%u(%u): error: ",
 109                                             locp->source,
 110                                             locp->first_line,
 111                                             locp->first_column);
 112    va_start(ap, fmt);
 113    state->info_log = talloc_vasprintf_append(state->info_log, fmt, ap);
 114    va_end(ap);
 115    state->info_log = talloc_strdup_append(state->info_log, "\n");
 116 }
 117
 118
 119 void
 120 _mesa_glsl_warning(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 121                    const char *fmt, ...)
 122 {
 123    va_list ap;
 124
 125    assert(state->info_log != NULL);
 126    state->info_log = talloc_asprintf_append(state->info_log,
 127                                             "%u:%u(%u): warning: ",
 128                                             locp->source,
 129                                             locp->first_line,
 130                                             locp->first_column);
 131    va_start(ap, fmt);
 132    state->info_log = talloc_vasprintf_append(state->info_log, fmt, ap);
 133    va_end(ap);
 134    state->info_log = talloc_strdup_append(state->info_log, "\n");
 135 }
 136
 137
 138 bool
 139 _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
 140                              const char *behavior, YYLTYPE *behavior_locp,
 141                              _mesa_glsl_parse_state *state)
 142 {
 143    enum {
 144       extension_disable,
 145       extension_enable,
 146       extension_require,
 147       extension_warn
 148    } ext_mode;
 149
 150    if (strcmp(behavior, "warn") == 0) {
 151       ext_mode = extension_warn;
 152    } else if (strcmp(behavior, "require") == 0) {
 153       ext_mode = extension_require;
 154    } else if (strcmp(behavior, "enable") == 0) {
 155       ext_mode = extension_enable;
 156    } else if (strcmp(behavior, "disable") == 0) {
 157       ext_mode = extension_disable;
 158    } else {
 159       _mesa_glsl_error(behavior_locp, state,
 160                        "Unknown extension behavior `%s'",
 161                        behavior);
 162       return false;
 163    }
 164
 165    bool unsupported = false;
 166
 167    if (strcmp(name, "all") == 0) {
 168       if ((ext_mode == extension_enable) || (ext_mode == extension_require)) {
 169          _mesa_glsl_error(name_locp, state, "Cannot %s all extensions",
 170                           (ext_mode == extension_enable)
 171                           ? "enable" : "require");
 172          return false;
 173       }
 174    } else if (strcmp(name, "GL_ARB_draw_buffers") == 0) {
 175       /* This extension is only supported in fragment shaders.
 176        */
 177       if (state->target != fragment_shader) {
 178          unsupported = true;
 179       } else {
 180          state->ARB_draw_buffers_enable = (ext_mode != extension_disable);
 181          state->ARB_draw_buffers_warn = (ext_mode == extension_warn);
 182       }
 183    } else if (strcmp(name, "GL_ARB_explicit_attrib_location") == 0) {
 184       state->ARB_explicit_attrib_location_enable =
 185          (ext_mode != extension_disable);
 186       state->ARB_explicit_attrib_location_warn =
 187          (ext_mode == extension_warn);
 188
 189       unsupported = !state->extensions->ARB_explicit_attrib_location;
 190    } else if (strcmp(name, "GL_ARB_fragment_coord_conventions") == 0) {
 191       state->ARB_fragment_coord_conventions_enable =
 192          (ext_mode != extension_disable);
 193       state->ARB_fragment_coord_conventions_warn =
 194          (ext_mode == extension_warn);
 195
 196       unsupported = !state->extensions->ARB_fragment_coord_conventions;
 197    } else if (strcmp(name, "GL_ARB_texture_rectangle") == 0) {
 198       state->ARB_texture_rectangle_enable = (ext_mode != extension_disable);
 199       state->ARB_texture_rectangle_warn = (ext_mode == extension_warn);
 200    } else if (strcmp(name, "GL_EXT_texture_array") == 0) {
 201       state->EXT_texture_array_enable = (ext_mode != extension_disable);
 202       state->EXT_texture_array_warn = (ext_mode == extension_warn);
 203
 204       unsupported = !state->extensions->EXT_texture_array;
 205    } else if (strcmp(name, "GL_ARB_shader_stencil_export") == 0) {
 206       if (state->target != fragment_shader) {
 207          unsupported = true;
 208       } else {
 209          state->ARB_shader_stencil_export_enable = (ext_mode != extension_disable);
 210          state->ARB_shader_stencil_export_warn = (ext_mode == extension_warn);
 211          unsupported = !state->extensions->ARB_shader_stencil_export;
 212       }
 213    } else {
 214       unsupported = true;
 215    }
 216
 217    if (unsupported) {
 218       static const char *const fmt = "extension `%s' unsupported in %s shader";
 219
 220       if (ext_mode == extension_require) {
 221          _mesa_glsl_error(name_locp, state, fmt,
 222                           name, _mesa_glsl_shader_target_name(state->target));
 223          return false;
 224       } else {
 225          _mesa_glsl_warning(name_locp, state, fmt,
 226                             name, _mesa_glsl_shader_target_name(state->target));
 227       }
 228    }
 229
 230    return true;
 231 }
 232
 233 void
 234 _mesa_ast_type_qualifier_print(const struct ast_type_qualifier *q)
 235 {
 236    if (q->flags.q.constant)
 237       printf("const ");
 238
 239    if (q->flags.q.invariant)
 240       printf("invariant ");
 241
 242    if (q->flags.q.attribute)
 243       printf("attribute ");
 244
 245    if (q->flags.q.varying)
 246       printf("varying ");
 247
 248    if (q->flags.q.in && q->flags.q.out)
 249       printf("inout ");
 250    else {
 251       if (q->flags.q.in)
 252          printf("in ");
 253
 254       if (q->flags.q.out)
 255          printf("out ");
 256    }
 257
 258    if (q->flags.q.centroid)
 259       printf("centroid ");
 260    if (q->flags.q.uniform)
 261       printf("uniform ");
 262    if (q->flags.q.smooth)
 263       printf("smooth ");
 264    if (q->flags.q.flat)
 265       printf("flat ");
 266    if (q->flags.q.noperspective)
 267       printf("noperspective ");
 268 }
 269
 270
 271 void
 272 ast_node::print(void) const
 273 {
 274    printf("unhandled node ");
 275 }
 276
 277
 278 ast_node::ast_node(void)
 279 {
 280    this->location.source = 0;
 281    this->location.line = 0;
 282    this->location.column = 0;
 283 }
 284
 285
 286 static void
 287 ast_opt_array_size_print(bool is_array, const ast_expression *array_size)
 288 {
 289    if (is_array) {
 290       printf("[ ");
 291
 292       if (array_size)
 293          array_size->print();
 294
 295       printf("] ");
 296    }
 297 }
 298
 299
 300 void
 301 ast_compound_statement::print(void) const
 302 {
 303    printf("{\n");
 304
 305    foreach_list_const(n, &this->statements) {
 306       ast_node *ast = exec_node_data(ast_node, n, link);
 307       ast->print();
 308    }
 309
 310    printf("}\n");
 311 }
 312
 313
 314 ast_compound_statement::ast_compound_statement(int new_scope,
 315                                                ast_node *statements)
 316 {
 317    this->new_scope = new_scope;
 318
 319    if (statements != NULL) {
 320       this->statements.push_degenerate_list_at_head(&statements->link);
 321    }
 322 }
 323
 324
 325 void
 326 ast_expression::print(void) const
 327 {
 328    switch (oper) {
 329    case ast_assign:
 330    case ast_mul_assign:
 331    case ast_div_assign:
 332    case ast_mod_assign:
 333    case ast_add_assign:
 334    case ast_sub_assign:
 335    case ast_ls_assign:
 336    case ast_rs_assign:
 337    case ast_and_assign:
 338    case ast_xor_assign:
 339    case ast_or_assign:
 340       subexpressions[0]->print();
 341       printf("%s ", operator_string(oper));
 342       subexpressions[1]->print();
 343       break;
 344
 345    case ast_field_selection:
 346       subexpressions[0]->print();
 347       printf(". %s ", primary_expression.identifier);
 348       break;
 349
 350    case ast_plus:
 351    case ast_neg:
 352    case ast_bit_not:
 353    case ast_logic_not:
 354    case ast_pre_inc:
 355    case ast_pre_dec:
 356       printf("%s ", operator_string(oper));
 357       subexpressions[0]->print();
 358       break;
 359
 360    case ast_post_inc:
 361    case ast_post_dec:
 362       subexpressions[0]->print();
 363       printf("%s ", operator_string(oper));
 364       break;
 365
 366    case ast_conditional:
 367       subexpressions[0]->print();
 368       printf("? ");
 369       subexpressions[1]->print();
 370       printf(": ");
 371       subexpressions[1]->print();
 372       break;
 373
 374    case ast_array_index:
 375       subexpressions[0]->print();
 376       printf("[ ");
 377       subexpressions[1]->print();
 378       printf("] ");
 379       break;
 380
 381    case ast_function_call: {
 382       subexpressions[0]->print();
 383       printf("( ");
 384
 385       foreach_list_const (n, &this->expressions) {
 386          if (n != this->expressions.get_head())
 387             printf(", ");
 388
 389          ast_node *ast = exec_node_data(ast_node, n, link);
 390          ast->print();
 391       }
 392
 393       printf(") ");
 394       break;
 395    }
 396
 397    case ast_identifier:
 398       printf("%s ", primary_expression.identifier);
 399       break;
 400
 401    case ast_int_constant:
 402       printf("%d ", primary_expression.int_constant);
 403       break;
 404
 405    case ast_uint_constant:
 406       printf("%u ", primary_expression.uint_constant);
 407       break;
 408
 409    case ast_float_constant:
 410       printf("%f ", primary_expression.float_constant);
 411       break;
 412
 413    case ast_bool_constant:
 414       printf("%s ",
 415              primary_expression.bool_constant
 416              ? "true" : "false");
 417       break;
 418
 419    case ast_sequence: {
 420       printf("( ");
 421       foreach_list_const(n, & this->expressions) {
 422          if (n != this->expressions.get_head())
 423             printf(", ");
 424
 425          ast_node *ast = exec_node_data(ast_node, n, link);
 426          ast->print();
 427       }
 428       printf(") ");
 429       break;
 430    }
 431
 432    default:
 433       assert(0);
 434       break;
 435    }
 436 }
 437
 438 ast_expression::ast_expression(int oper,
 439                                ast_expression *ex0,
 440                                ast_expression *ex1,
 441                                ast_expression *ex2)
 442 {
 443    this->oper = ast_operators(oper);
 444    this->subexpressions[0] = ex0;
 445    this->subexpressions[1] = ex1;
 446    this->subexpressions[2] = ex2;
 447 }
 448
 449
 450 void
 451 ast_expression_statement::print(void) const
 452 {
 453    if (expression)
 454       expression->print();
 455
 456    printf("; ");
 457 }
 458
 459
 460 ast_expression_statement::ast_expression_statement(ast_expression *ex) :
 461    expression(ex)
 462 {
 463    /* empty */
 464 }
 465
 466
 467 void
 468 ast_function::print(void) const
 469 {
 470    return_type->print();
 471    printf(" %s (", identifier);
 472
 473    foreach_list_const(n, & this->parameters) {
 474       ast_node *ast = exec_node_data(ast_node, n, link);
 475       ast->print();
 476    }
 477
 478    printf(")");
 479 }
 480
 481
 482 ast_function::ast_function(void)
 483    : is_definition(false), signature(NULL)
 484 {
 485    /* empty */
 486 }
 487
 488
 489 void
 490 ast_fully_specified_type::print(void) const
 491 {
 492    _mesa_ast_type_qualifier_print(& qualifier);
 493    specifier->print();
 494 }
 495
 496
 497 void
 498 ast_parameter_declarator::print(void) const
 499 {
 500    type->print();
 501    if (identifier)
 502       printf("%s ", identifier);
 503    ast_opt_array_size_print(is_array, array_size);
 504 }
 505
 506
 507 void
 508 ast_function_definition::print(void) const
 509 {
 510    prototype->print();
 511    body->print();
 512 }
 513
 514
 515 void
 516 ast_declaration::print(void) const
 517 {
 518    printf("%s ", identifier);
 519    ast_opt_array_size_print(is_array, array_size);
 520
 521    if (initializer) {
 522       printf("= ");
 523       initializer->print();
 524    }
 525 }
 526
 527
 528 ast_declaration::ast_declaration(char *identifier, int is_array,
 529                                  ast_expression *array_size,
 530                                  ast_expression *initializer)
 531 {
 532    this->identifier = identifier;
 533    this->is_array = is_array;
 534    this->array_size = array_size;
 535    this->initializer = initializer;
 536 }
 537
 538
 539 void
 540 ast_declarator_list::print(void) const
 541 {
 542    assert(type || invariant);
 543
 544    if (type)
 545       type->print();
 546    else
 547       printf("invariant ");
 548
 549    foreach_list_const (ptr, & this->declarations) {
 550       if (ptr != this->declarations.get_head())
 551          printf(", ");
 552
 553       ast_node *ast = exec_node_data(ast_node, ptr, link);
 554       ast->print();
 555    }
 556
 557    printf("; ");
 558 }
 559
 560
 561 ast_declarator_list::ast_declarator_list(ast_fully_specified_type *type)
 562 {
 563    this->type = type;
 564    this->invariant = false;
 565 }
 566
 567 void
 568 ast_jump_statement::print(void) const
 569 {
 570    switch (mode) {
 571    case ast_continue:
 572       printf("continue; ");
 573       break;
 574    case ast_break:
 575       printf("break; ");
 576       break;
 577    case ast_return:
 578       printf("return ");
 579       if (opt_return_value)
 580          opt_return_value->print();
 581
 582       printf("; ");
 583       break;
 584    case ast_discard:
 585       printf("discard; ");
 586       break;
 587    }
 588 }
 589
 590
 591 ast_jump_statement::ast_jump_statement(int mode, ast_expression *return_value)
 592 {
 593    this->mode = ast_jump_modes(mode);
 594
 595    if (mode == ast_return)
 596       opt_return_value = return_value;
 597 }
 598
 599
 600 void
 601 ast_selection_statement::print(void) const
 602 {
 603    printf("if ( ");
 604    condition->print();
 605    printf(") ");
 606
 607    then_statement->print();
 608
 609    if (else_statement) {
 610       printf("else ");
 611       else_statement->print();
 612    }
 613
 614 }
 615
 616
 617 ast_selection_statement::ast_selection_statement(ast_expression *condition,
 618                                                  ast_node *then_statement,
 619                                                  ast_node *else_statement)
 620 {
 621    this->condition = condition;
 622    this->then_statement = then_statement;
 623    this->else_statement = else_statement;
 624 }
 625
 626
 627 void
 628 ast_iteration_statement::print(void) const
 629 {
 630    switch (mode) {
 631    case ast_for:
 632       printf("for( ");
 633       if (init_statement)
 634          init_statement->print();
 635       printf("; ");
 636
 637       if (condition)
 638          condition->print();
 639       printf("; ");
 640
 641       if (rest_expression)
 642          rest_expression->print();
 643       printf(") ");
 644
 645       body->print();
 646       break;
 647
 648    case ast_while:
 649       printf("while ( ");
 650       if (condition)
 651          condition->print();
 652       printf(") ");
 653       body->print();
 654       break;
 655
 656    case ast_do_while:
 657       printf("do ");
 658       body->print();
 659       printf("while ( ");
 660       if (condition)
 661          condition->print();
 662       printf("); ");
 663       break;
 664    }
 665 }
 666
 667
 668 ast_iteration_statement::ast_iteration_statement(int mode,
 669                                                  ast_node *init,
 670                                                  ast_node *condition,
 671                                                  ast_expression *rest_expression,
 672                                                  ast_node *body)
 673 {
 674    this->mode = ast_iteration_modes(mode);
 675    this->init_statement = init;
 676    this->condition = condition;
 677    this->rest_expression = rest_expression;
 678    this->body = body;
 679 }
 680
 681
 682 void
 683 ast_struct_specifier::print(void) const
 684 {
 685    printf("struct %s { ", name);
 686    foreach_list_const(n, &this->declarations) {
 687       ast_node *ast = exec_node_data(ast_node, n, link);
 688       ast->print();
 689    }
 690    printf("} ");
 691 }
 692
 693
 694 ast_struct_specifier::ast_struct_specifier(char *identifier,
 695                                            ast_node *declarator_list)
 696 {
 697    if (identifier == NULL) {
 698       static unsigned anon_count = 1;
 699       identifier = talloc_asprintf(this, "#anon_struct_%04x", anon_count);
 700       anon_count++;
 701    }
 702    name = identifier;
 703    this->declarations.push_degenerate_list_at_head(&declarator_list->link);
 704 }
 705
 706 bool
 707 do_common_optimization(exec_list *ir, bool linked, unsigned max_unroll_iterations)
 708 {
 709    GLboolean progress = GL_FALSE;
 710
 711    progress = lower_instructions(ir, SUB_TO_ADD_NEG) || progress;
 712
 713    if (linked) {
 714       progress = do_function_inlining(ir) || progress;
 715       progress = do_dead_functions(ir) || progress;
 716    }
 717    progress = do_structure_splitting(ir) || progress;
 718    progress = do_if_simplification(ir) || progress;
 719    progress = do_discard_simplification(ir) || progress;
 720    progress = do_copy_propagation(ir) || progress;
 721    if (linked)
 722       progress = do_dead_code(ir) || progress;
 723    else
 724       progress = do_dead_code_unlinked(ir) || progress;
 725    progress = do_dead_code_local(ir) || progress;
 726    progress = do_tree_grafting(ir) || progress;
 727    progress = do_constant_propagation(ir) || progress;
 728    if (linked)
 729       progress = do_constant_variable(ir) || progress;
 730    else
 731       progress = do_constant_variable_unlinked(ir) || progress;
 732    progress = do_constant_folding(ir) || progress;
 733    progress = do_algebraic(ir) || progress;
 734    progress = do_lower_jumps(ir) || progress;
 735    progress = do_vec_index_to_swizzle(ir) || progress;
 736    progress = do_swizzle_swizzle(ir) || progress;
 737    progress = do_noop_swizzle(ir) || progress;
 738
 739    progress = optimize_redundant_jumps(ir) || progress;
 740
 741    loop_state *ls = analyze_loop_variables(ir);
 742    progress = set_loop_controls(ir, ls) || progress;
 743    progress = unroll_loops(ir, ls, max_unroll_iterations) || progress;
 744    delete ls;
 745
 746    return progress;
 747 }
 748
 749 extern "C" {
 750
 751 /**
 752  * To be called at GL teardown time, this frees compiler datastructures.
 753  *
 754  * After calling this, any previously compiled shaders and shader
 755  * programs would be invalid.  So this should happen at approximately
 756  * program exit.
 757  */
 758 void
 759 _mesa_destroy_shader_compiler(void)
 760 {
 761    _mesa_destroy_shader_compiler_caches();
 762
 763    _mesa_glsl_release_types();
 764 }
 765
 766 /**
 767  * Releases compiler caches to trade off performance for memory.
 768  *
 769  * Intended to be used with glReleaseShaderCompiler().
 770  */
 771 void
 772 _mesa_destroy_shader_compiler_caches(void)
 773 {
 774    _mesa_glsl_release_functions();
 775 }
 776
 777 }