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/mtypes.h"
  31 }
  32
  33 #include "ast.h"
  34 #include "glsl_parser_extras.h"
  35 #include "glsl_parser.h"
  36
  37 _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct __GLcontextRec *ctx,
  38                                                GLenum target, void *mem_ctx)
  39 {
  40    switch (target) {
  41    case GL_VERTEX_SHADER:   this->target = vertex_shader; break;
  42    case GL_FRAGMENT_SHADER: this->target = fragment_shader; break;
  43    case GL_GEOMETRY_SHADER: this->target = geometry_shader; break;
  44    }
  45
  46    this->scanner = NULL;
  47    this->translation_unit.make_empty();
  48    this->symbols = new(mem_ctx) glsl_symbol_table;
  49    this->info_log = talloc_strdup(mem_ctx, "");
  50    this->error = false;
  51    this->loop_or_switch_nesting = NULL;
  52    this->ARB_texture_rectangle_enable = true;
  53
  54    if (ctx != NULL) {
  55       this->extensions = &ctx->Extensions;
  56
  57       this->Const.MaxLights = ctx->Const.MaxLights;
  58       this->Const.MaxClipPlanes = ctx->Const.MaxClipPlanes;
  59       this->Const.MaxTextureUnits = ctx->Const.MaxTextureUnits;
  60       this->Const.MaxTextureCoords = ctx->Const.MaxTextureCoordUnits;
  61       this->Const.MaxVertexAttribs = ctx->Const.VertexProgram.MaxAttribs;
  62       this->Const.MaxVertexUniformComponents = ctx->Const.VertexProgram.MaxUniformComponents;
  63       this->Const.MaxVaryingFloats = ctx->Const.MaxVarying * 4;
  64       this->Const.MaxVertexTextureImageUnits = ctx->Const.MaxVertexTextureImageUnits;
  65       this->Const.MaxCombinedTextureImageUnits = ctx->Const.MaxCombinedTextureImageUnits;
  66       this->Const.MaxTextureImageUnits = ctx->Const.MaxTextureImageUnits;
  67       this->Const.MaxFragmentUniformComponents = ctx->Const.FragmentProgram.MaxUniformComponents;
  68
  69       this->Const.MaxDrawBuffers = ctx->Const.MaxDrawBuffers;
  70    } else {
  71       static struct gl_extensions null_extensions;
  72
  73       memset(&null_extensions, 0, sizeof(null_extensions));
  74       this->extensions = &null_extensions;
  75    }
  76 }
  77
  78 const char *
  79 _mesa_glsl_shader_target_name(enum _mesa_glsl_parser_targets target)
  80 {
  81    switch (target) {
  82    case vertex_shader:   return "vertex";
  83    case fragment_shader: return "fragment";
  84    case geometry_shader: return "geometry";
  85    case ir_shader:       break;
  86    }
  87
  88    assert(!"Should not get here.");
  89    return "unknown";
  90 }
  91
  92
  93 void
  94 _mesa_glsl_error(YYLTYPE *locp, _mesa_glsl_parse_state *state,
  95                  const char *fmt, ...)
  96 {
  97    va_list ap;
  98
  99    state->error = true;
 100
 101    assert(state->info_log != NULL);
 102    state->info_log = talloc_asprintf_append(state->info_log,
 103                                             "%u:%u(%u): error: ",
 104                                             locp->source,
 105                                             locp->first_line,
 106                                             locp->first_column);
 107    va_start(ap, fmt);
 108    state->info_log = talloc_vasprintf_append(state->info_log, fmt, ap);
 109    va_end(ap);
 110    state->info_log = talloc_strdup_append(state->info_log, "\n");
 111 }
 112
 113
 114 void
 115 _mesa_glsl_warning(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 116                    const char *fmt, ...)
 117 {
 118    va_list ap;
 119
 120    assert(state->info_log != NULL);
 121    state->info_log = talloc_asprintf_append(state->info_log,
 122                                             "%u:%u(%u): warning: ",
 123                                             locp->source,
 124                                             locp->first_line,
 125                                             locp->first_column);
 126    va_start(ap, fmt);
 127    state->info_log = talloc_vasprintf_append(state->info_log, fmt, ap);
 128    va_end(ap);
 129    state->info_log = talloc_strdup_append(state->info_log, "\n");
 130 }
 131
 132
 133 bool
 134 _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
 135                              const char *behavior, YYLTYPE *behavior_locp,
 136                              _mesa_glsl_parse_state *state)
 137 {
 138    enum {
 139       extension_disable,
 140       extension_enable,
 141       extension_require,
 142       extension_warn
 143    } ext_mode;
 144
 145    if (strcmp(behavior, "warn") == 0) {
 146       ext_mode = extension_warn;
 147    } else if (strcmp(behavior, "require") == 0) {
 148       ext_mode = extension_require;
 149    } else if (strcmp(behavior, "enable") == 0) {
 150       ext_mode = extension_enable;
 151    } else if (strcmp(behavior, "disable") == 0) {
 152       ext_mode = extension_disable;
 153    } else {
 154       _mesa_glsl_error(behavior_locp, state,
 155                        "Unknown extension behavior `%s'",
 156                        behavior);
 157       return false;
 158    }
 159
 160    bool unsupported = false;
 161
 162    if (strcmp(name, "all") == 0) {
 163       if ((ext_mode == extension_enable) || (ext_mode == extension_require)) {
 164          _mesa_glsl_error(name_locp, state, "Cannot %s all extensions",
 165                           (ext_mode == extension_enable)
 166                           ? "enable" : "require");
 167          return false;
 168       }
 169    } else if (strcmp(name, "GL_ARB_draw_buffers") == 0) {
 170       /* This extension is only supported in fragment shaders.
 171        */
 172       if (state->target != fragment_shader) {
 173          unsupported = true;
 174       } else {
 175          state->ARB_draw_buffers_enable = (ext_mode != extension_disable);
 176          state->ARB_draw_buffers_warn = (ext_mode == extension_warn);
 177       }
 178    } else if (strcmp(name, "GL_ARB_texture_rectangle") == 0) {
 179       state->ARB_texture_rectangle_enable = (ext_mode != extension_disable);
 180       state->ARB_texture_rectangle_warn = (ext_mode == extension_warn);
 181    } else if (strcmp(name, "GL_EXT_texture_array") == 0) {
 182       state->EXT_texture_array_enable = (ext_mode != extension_disable);
 183       state->EXT_texture_array_warn = (ext_mode == extension_warn);
 184
 185       unsupported = !state->extensions->EXT_texture_array;
 186    } else {
 187       unsupported = true;
 188    }
 189
 190    if (unsupported) {
 191       static const char *const fmt = "extension `%s' unsupported in %s shader";
 192
 193       if (ext_mode == extension_require) {
 194          _mesa_glsl_error(name_locp, state, fmt,
 195                           name, _mesa_glsl_shader_target_name(state->target));
 196          return false;
 197       } else {
 198          _mesa_glsl_warning(name_locp, state, fmt,
 199                             name, _mesa_glsl_shader_target_name(state->target));
 200       }
 201    }
 202
 203    return true;
 204 }
 205
 206 void
 207 _mesa_ast_type_qualifier_print(const struct ast_type_qualifier *q)
 208 {
 209    if (q->constant)
 210       printf("const ");
 211
 212    if (q->invariant)
 213       printf("invariant ");
 214
 215    if (q->attribute)
 216       printf("attribute ");
 217
 218    if (q->varying)
 219       printf("varying ");
 220
 221    if (q->in && q->out)
 222       printf("inout ");
 223    else {
 224       if (q->in)
 225          printf("in ");
 226
 227       if (q->out)
 228          printf("out ");
 229    }
 230
 231    if (q->centroid)
 232       printf("centroid ");
 233    if (q->uniform)
 234       printf("uniform ");
 235    if (q->smooth)
 236       printf("smooth ");
 237    if (q->flat)
 238       printf("flat ");
 239    if (q->noperspective)
 240       printf("noperspective ");
 241 }
 242
 243
 244 void
 245 ast_node::print(void) const
 246 {
 247    printf("unhandled node ");
 248 }
 249
 250
 251 ast_node::ast_node(void)
 252 {
 253    /* empty */
 254 }
 255
 256
 257 static void
 258 ast_opt_array_size_print(bool is_array, const ast_expression *array_size)
 259 {
 260    if (is_array) {
 261       printf("[ ");
 262
 263       if (array_size)
 264          array_size->print();
 265
 266       printf("] ");
 267    }
 268 }
 269
 270
 271 void
 272 ast_compound_statement::print(void) const
 273 {
 274    printf("{\n");
 275
 276    foreach_list_const(n, &this->statements) {
 277       ast_node *ast = exec_node_data(ast_node, n, link);
 278       ast->print();
 279    }
 280
 281    printf("}\n");
 282 }
 283
 284
 285 ast_compound_statement::ast_compound_statement(int new_scope,
 286                                                ast_node *statements)
 287 {
 288    this->new_scope = new_scope;
 289
 290    if (statements != NULL) {
 291       this->statements.push_degenerate_list_at_head(&statements->link);
 292    }
 293 }
 294
 295
 296 void
 297 ast_expression::print(void) const
 298 {
 299    switch (oper) {
 300    case ast_assign:
 301    case ast_mul_assign:
 302    case ast_div_assign:
 303    case ast_mod_assign:
 304    case ast_add_assign:
 305    case ast_sub_assign:
 306    case ast_ls_assign:
 307    case ast_rs_assign:
 308    case ast_and_assign:
 309    case ast_xor_assign:
 310    case ast_or_assign:
 311       subexpressions[0]->print();
 312       printf("%s ", operator_string(oper));
 313       subexpressions[1]->print();
 314       break;
 315
 316    case ast_field_selection:
 317       subexpressions[0]->print();
 318       printf(". %s ", primary_expression.identifier);
 319       break;
 320
 321    case ast_plus:
 322    case ast_neg:
 323    case ast_bit_not:
 324    case ast_logic_not:
 325    case ast_pre_inc:
 326    case ast_pre_dec:
 327       printf("%s ", operator_string(oper));
 328       subexpressions[0]->print();
 329       break;
 330
 331    case ast_post_inc:
 332    case ast_post_dec:
 333       subexpressions[0]->print();
 334       printf("%s ", operator_string(oper));
 335       break;
 336
 337    case ast_conditional:
 338       subexpressions[0]->print();
 339       printf("? ");
 340       subexpressions[1]->print();
 341       printf(": ");
 342       subexpressions[1]->print();
 343       break;
 344
 345    case ast_array_index:
 346       subexpressions[0]->print();
 347       printf("[ ");
 348       subexpressions[1]->print();
 349       printf("] ");
 350       break;
 351
 352    case ast_function_call: {
 353       subexpressions[0]->print();
 354       printf("( ");
 355
 356       foreach_list_const (n, &this->expressions) {
 357          if (n != this->expressions.get_head())
 358             printf(", ");
 359
 360          ast_node *ast = exec_node_data(ast_node, n, link);
 361          ast->print();
 362       }
 363
 364       printf(") ");
 365       break;
 366    }
 367
 368    case ast_identifier:
 369       printf("%s ", primary_expression.identifier);
 370       break;
 371
 372    case ast_int_constant:
 373       printf("%d ", primary_expression.int_constant);
 374       break;
 375
 376    case ast_uint_constant:
 377       printf("%u ", primary_expression.uint_constant);
 378       break;
 379
 380    case ast_float_constant:
 381       printf("%f ", primary_expression.float_constant);
 382       break;
 383
 384    case ast_bool_constant:
 385       printf("%s ",
 386              primary_expression.bool_constant
 387              ? "true" : "false");
 388       break;
 389
 390    case ast_sequence: {
 391       printf("( ");
 392       foreach_list_const(n, & this->expressions) {
 393          if (n != this->expressions.get_head())
 394             printf(", ");
 395
 396          ast_node *ast = exec_node_data(ast_node, n, link);
 397          ast->print();
 398       }
 399       printf(") ");
 400       break;
 401    }
 402
 403    default:
 404       assert(0);
 405       break;
 406    }
 407 }
 408
 409 ast_expression::ast_expression(int oper,
 410                                ast_expression *ex0,
 411                                ast_expression *ex1,
 412                                ast_expression *ex2)
 413 {
 414    this->oper = ast_operators(oper);
 415    this->subexpressions[0] = ex0;
 416    this->subexpressions[1] = ex1;
 417    this->subexpressions[2] = ex2;
 418 }
 419
 420
 421 void
 422 ast_expression_statement::print(void) const
 423 {
 424    if (expression)
 425       expression->print();
 426
 427    printf("; ");
 428 }
 429
 430
 431 ast_expression_statement::ast_expression_statement(ast_expression *ex) :
 432    expression(ex)
 433 {
 434    /* empty */
 435 }
 436
 437
 438 void
 439 ast_function::print(void) const
 440 {
 441    return_type->print();
 442    printf(" %s (", identifier);
 443
 444    foreach_list_const(n, & this->parameters) {
 445       ast_node *ast = exec_node_data(ast_node, n, link);
 446       ast->print();
 447    }
 448
 449    printf(")");
 450 }
 451
 452
 453 ast_function::ast_function(void)
 454    : is_definition(false), signature(NULL)
 455 {
 456    /* empty */
 457 }
 458
 459
 460 void
 461 ast_fully_specified_type::print(void) const
 462 {
 463    _mesa_ast_type_qualifier_print(& qualifier);
 464    specifier->print();
 465 }
 466
 467
 468 void
 469 ast_parameter_declarator::print(void) const
 470 {
 471    type->print();
 472    if (identifier)
 473       printf("%s ", identifier);
 474    ast_opt_array_size_print(is_array, array_size);
 475 }
 476
 477
 478 void
 479 ast_function_definition::print(void) const
 480 {
 481    prototype->print();
 482    body->print();
 483 }
 484
 485
 486 void
 487 ast_declaration::print(void) const
 488 {
 489    printf("%s ", identifier);
 490    ast_opt_array_size_print(is_array, array_size);
 491
 492    if (initializer) {
 493       printf("= ");
 494       initializer->print();
 495    }
 496 }
 497
 498
 499 ast_declaration::ast_declaration(char *identifier, int is_array,
 500                                  ast_expression *array_size,
 501                                  ast_expression *initializer)
 502 {
 503    this->identifier = identifier;
 504    this->is_array = is_array;
 505    this->array_size = array_size;
 506    this->initializer = initializer;
 507 }
 508
 509
 510 void
 511 ast_declarator_list::print(void) const
 512 {
 513    assert(type || invariant);
 514
 515    if (type)
 516       type->print();
 517    else
 518       printf("invariant ");
 519
 520    foreach_list_const (ptr, & this->declarations) {
 521       if (ptr != this->declarations.get_head())
 522          printf(", ");
 523
 524       ast_node *ast = exec_node_data(ast_node, ptr, link);
 525       ast->print();
 526    }
 527
 528    printf("; ");
 529 }
 530
 531
 532 ast_declarator_list::ast_declarator_list(ast_fully_specified_type *type)
 533 {
 534    this->type = type;
 535    this->invariant = false;
 536 }
 537
 538 void
 539 ast_jump_statement::print(void) const
 540 {
 541    switch (mode) {
 542    case ast_continue:
 543       printf("continue; ");
 544       break;
 545    case ast_break:
 546       printf("break; ");
 547       break;
 548    case ast_return:
 549       printf("return ");
 550       if (opt_return_value)
 551          opt_return_value->print();
 552
 553       printf("; ");
 554       break;
 555    case ast_discard:
 556       printf("discard; ");
 557       break;
 558    }
 559 }
 560
 561
 562 ast_jump_statement::ast_jump_statement(int mode, ast_expression *return_value)
 563 {
 564    this->mode = ast_jump_modes(mode);
 565
 566    if (mode == ast_return)
 567       opt_return_value = return_value;
 568 }
 569
 570
 571 void
 572 ast_selection_statement::print(void) const
 573 {
 574    printf("if ( ");
 575    condition->print();
 576    printf(") ");
 577
 578    then_statement->print();
 579
 580    if (else_statement) {
 581       printf("else ");
 582       else_statement->print();
 583    }
 584
 585 }
 586
 587
 588 ast_selection_statement::ast_selection_statement(ast_expression *condition,
 589                                                  ast_node *then_statement,
 590                                                  ast_node *else_statement)
 591 {
 592    this->condition = condition;
 593    this->then_statement = then_statement;
 594    this->else_statement = else_statement;
 595 }
 596
 597
 598 void
 599 ast_iteration_statement::print(void) const
 600 {
 601    switch (mode) {
 602    case ast_for:
 603       printf("for( ");
 604       if (init_statement)
 605          init_statement->print();
 606       printf("; ");
 607
 608       if (condition)
 609          condition->print();
 610       printf("; ");
 611
 612       if (rest_expression)
 613          rest_expression->print();
 614       printf(") ");
 615
 616       body->print();
 617       break;
 618
 619    case ast_while:
 620       printf("while ( ");
 621       if (condition)
 622          condition->print();
 623       printf(") ");
 624       body->print();
 625       break;
 626
 627    case ast_do_while:
 628       printf("do ");
 629       body->print();
 630       printf("while ( ");
 631       if (condition)
 632          condition->print();
 633       printf("); ");
 634       break;
 635    }
 636 }
 637
 638
 639 ast_iteration_statement::ast_iteration_statement(int mode,
 640                                                  ast_node *init,
 641                                                  ast_node *condition,
 642                                                  ast_expression *rest_expression,
 643                                                  ast_node *body)
 644 {
 645    this->mode = ast_iteration_modes(mode);
 646    this->init_statement = init;
 647    this->condition = condition;
 648    this->rest_expression = rest_expression;
 649    this->body = body;
 650 }
 651
 652
 653 void
 654 ast_struct_specifier::print(void) const
 655 {
 656    printf("struct %s { ", name);
 657    foreach_list_const(n, &this->declarations) {
 658       ast_node *ast = exec_node_data(ast_node, n, link);
 659       ast->print();
 660    }
 661    printf("} ");
 662 }
 663
 664
 665 ast_struct_specifier::ast_struct_specifier(char *identifier,
 666                                            ast_node *declarator_list)
 667 {
 668    name = identifier;
 669    this->declarations.push_degenerate_list_at_head(&declarator_list->link);
 670 }