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 "main/core.h" /* for struct gl_context */
  30 }
  31
  32 #include "ralloc.h"
  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 = ralloc_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    /* Note: Once the OpenGL 3.0 'forward compatible' context or the OpenGL 3.2
  84     * Core context is supported, this logic will need change.  Older versions of
  85     * GLSL are no longer supported outside the compatibility contexts of 3.x.
  86     */
  87    this->Const.GLSL_100ES = (ctx->API == API_OPENGLES2)
  88       || ctx->Extensions.ARB_ES2_compatibility;
  89    this->Const.GLSL_110 = (ctx->API == API_OPENGL);
  90    this->Const.GLSL_120 = (ctx->API == API_OPENGL)
  91       && (ctx->Const.GLSLVersion >= 120);
  92    this->Const.GLSL_130 = (ctx->API == API_OPENGL)
  93       && (ctx->Const.GLSLVersion >= 130);
  94
  95    const unsigned lowest_version =
  96       (ctx->API == API_OPENGLES2) || ctx->Extensions.ARB_ES2_compatibility
  97       ? 100 : 110;
  98    const unsigned highest_version =
  99       (ctx->API == API_OPENGL) ? ctx->Const.GLSLVersion : 100;
 100    char *supported = ralloc_strdup(this, "");
 101
 102    for (unsigned ver = lowest_version; ver <= highest_version; ver += 10) {
 103       const char *const prefix = (ver == lowest_version)
 104          ? ""
 105          : ((ver == highest_version) ? ", and " : ", ");
 106
 107       ralloc_asprintf_append(& supported, "%s%d.%02d%s",
 108                              prefix,
 109                              ver / 100, ver % 100,
 110                              (ver == 100) ? " ES" : "");
 111    }
 112
 113    this->supported_version_string = supported;
 114 }
 115
 116 const char *
 117 _mesa_glsl_shader_target_name(enum _mesa_glsl_parser_targets target)
 118 {
 119    switch (target) {
 120    case vertex_shader:   return "vertex";
 121    case fragment_shader: return "fragment";
 122    case geometry_shader: return "geometry";
 123    }
 124
 125    assert(!"Should not get here.");
 126    return "unknown";
 127 }
 128
 129
 130 void
 131 _mesa_glsl_error(YYLTYPE *locp, _mesa_glsl_parse_state *state,
 132                  const char *fmt, ...)
 133 {
 134    va_list ap;
 135
 136    state->error = true;
 137
 138    assert(state->info_log != NULL);
 139    ralloc_asprintf_append(&state->info_log, "%u:%u(%u): error: ",
 140                                             locp->source,
 141                                             locp->first_line,
 142                                             locp->first_column);
 143    va_start(ap, fmt);
 144    ralloc_vasprintf_append(&state->info_log, fmt, ap);
 145    va_end(ap);
 146    ralloc_strcat(&state->info_log, "\n");
 147 }
 148
 149
 150 void
 151 _mesa_glsl_warning(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 152                    const char *fmt, ...)
 153 {
 154    va_list ap;
 155
 156    assert(state->info_log != NULL);
 157    ralloc_asprintf_append(&state->info_log, "%u:%u(%u): warning: ",
 158                                             locp->source,
 159                                             locp->first_line,
 160                                             locp->first_column);
 161    va_start(ap, fmt);
 162    ralloc_vasprintf_append(&state->info_log, fmt, ap);
 163    va_end(ap);
 164    ralloc_strcat(&state->info_log, "\n");
 165 }
 166
 167
 168 /**
 169  * Enum representing the possible behaviors that can be specified in
 170  * an #extension directive.
 171  */
 172 enum ext_behavior {
 173    extension_disable,
 174    extension_enable,
 175    extension_require,
 176    extension_warn
 177 };
 178
 179 /**
 180  * Element type for _mesa_glsl_supported_extensions
 181  */
 182 struct _mesa_glsl_extension {
 183    /**
 184     * Name of the extension when referred to in a GLSL extension
 185     * statement
 186     */
 187    const char *name;
 188
 189    /** True if this extension is available to vertex shaders */
 190    bool avail_in_VS;
 191
 192    /** True if this extension is available to geometry shaders */
 193    bool avail_in_GS;
 194
 195    /** True if this extension is available to fragment shaders */
 196    bool avail_in_FS;
 197
 198    /** True if this extension is available to desktop GL shaders */
 199    bool avail_in_GL;
 200
 201    /** True if this extension is available to GLES shaders */
 202    bool avail_in_ES;
 203
 204    /**
 205     * Flag in the gl_extensions struct indicating whether this
 206     * extension is supported by the driver, or
 207     * &gl_extensions::dummy_true if supported by all drivers.
 208     *
 209     * Note: the type (GLboolean gl_extensions::*) is a "pointer to
 210     * member" type, the type-safe alternative to the "offsetof" macro.
 211     * In a nutshell:
 212     *
 213     * - foo bar::* p declares p to be an "offset" to a field of type
 214     *   foo that exists within struct bar
 215     * - &bar::baz computes the "offset" of field baz within struct bar
 216     * - x.*p accesses the field of x that exists at "offset" p
 217     * - x->*p is equivalent to (*x).*p
 218     */
 219    const GLboolean gl_extensions::* supported_flag;
 220
 221    /**
 222     * Flag in the _mesa_glsl_parse_state struct that should be set
 223     * when this extension is enabled.
 224     *
 225     * See note in _mesa_glsl_extension::supported_flag about "pointer
 226     * to member" types.
 227     */
 228    bool _mesa_glsl_parse_state::* enable_flag;
 229
 230    /**
 231     * Flag in the _mesa_glsl_parse_state struct that should be set
 232     * when the shader requests "warn" behavior for this extension.
 233     *
 234     * See note in _mesa_glsl_extension::supported_flag about "pointer
 235     * to member" types.
 236     */
 237    bool _mesa_glsl_parse_state::* warn_flag;
 238
 239
 240    bool compatible_with_state(const _mesa_glsl_parse_state *state) const;
 241    void set_flags(_mesa_glsl_parse_state *state, ext_behavior behavior) const;
 242 };
 243
 244 #define EXT(NAME, VS, GS, FS, GL, ES, SUPPORTED_FLAG)                   \
 245    { "GL_" #NAME, VS, GS, FS, GL, ES, &gl_extensions::SUPPORTED_FLAG,   \
 246          &_mesa_glsl_parse_state::NAME##_enable,                        \
 247          &_mesa_glsl_parse_state::NAME##_warn }
 248
 249 /**
 250  * Table of extensions that can be enabled/disabled within a shader,
 251  * and the conditions under which they are supported.
 252  */
 253 static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
 254    /*                                  target availability  API availability */
 255    /* name                             VS     GS     FS     GL     ES         supported flag */
 256    EXT(ARB_draw_buffers,               false, false, true,  true,  false,     dummy_true),
 257    EXT(ARB_draw_instanced,             true,  false, false, true,  false,     ARB_draw_instanced),
 258    EXT(ARB_explicit_attrib_location,   true,  false, true,  true,  false,     ARB_explicit_attrib_location),
 259    EXT(ARB_fragment_coord_conventions, true,  false, true,  true,  false,     ARB_fragment_coord_conventions),
 260    EXT(ARB_texture_rectangle,          true,  false, true,  true,  false,     dummy_true),
 261    EXT(EXT_texture_array,              true,  false, true,  true,  false,     EXT_texture_array),
 262    EXT(ARB_shader_texture_lod,         true,  false, true,  true,  false,     ARB_shader_texture_lod),
 263    EXT(ARB_shader_stencil_export,      false, false, true,  true,  false,     ARB_shader_stencil_export),
 264    EXT(AMD_conservative_depth,         true,  false, true,  true,  false,     AMD_conservative_depth),
 265    EXT(AMD_shader_stencil_export,      false, false, true,  true,  false,     ARB_shader_stencil_export),
 266    EXT(OES_texture_3D,                 true,  false, true,  false, true,      EXT_texture3D),
 267 };
 268
 269 #undef EXT
 270
 271
 272 /**
 273  * Determine whether a given extension is compatible with the target,
 274  * API, and extension information in the current parser state.
 275  */
 276 bool _mesa_glsl_extension::compatible_with_state(const _mesa_glsl_parse_state *
 277                                                  state) const
 278 {
 279    /* Check that this extension matches the type of shader we are
 280     * compiling to.
 281     */
 282    switch (state->target) {
 283    case vertex_shader:
 284       if (!this->avail_in_VS) {
 285          return false;
 286       }
 287       break;
 288    case geometry_shader:
 289       if (!this->avail_in_GS) {
 290          return false;
 291       }
 292       break;
 293    case fragment_shader:
 294       if (!this->avail_in_FS) {
 295          return false;
 296       }
 297       break;
 298    default:
 299       assert (!"Unrecognized shader target");
 300       return false;
 301    }
 302
 303    /* Check that this extension matches whether we are compiling
 304     * for desktop GL or GLES.
 305     */
 306    if (state->es_shader) {
 307       if (!this->avail_in_ES) return false;
 308    } else {
 309       if (!this->avail_in_GL) return false;
 310    }
 311
 312    /* Check that this extension is supported by the OpenGL
 313     * implementation.
 314     *
 315     * Note: the ->* operator indexes into state->extensions by the
 316     * offset this->supported_flag.  See
 317     * _mesa_glsl_extension::supported_flag for more info.
 318     */
 319    return state->extensions->*(this->supported_flag);
 320 }
 321
 322 /**
 323  * Set the appropriate flags in the parser state to establish the
 324  * given behavior for this extension.
 325  */
 326 void _mesa_glsl_extension::set_flags(_mesa_glsl_parse_state *state,
 327                                      ext_behavior behavior) const
 328 {
 329    /* Note: the ->* operator indexes into state by the
 330     * offsets this->enable_flag and this->warn_flag.  See
 331     * _mesa_glsl_extension::supported_flag for more info.
 332     */
 333    state->*(this->enable_flag) = (behavior != extension_disable);
 334    state->*(this->warn_flag)   = (behavior == extension_warn);
 335 }
 336
 337 /**
 338  * Find an extension by name in _mesa_glsl_supported_extensions.  If
 339  * the name is not found, return NULL.
 340  */
 341 static const _mesa_glsl_extension *find_extension(const char *name)
 342 {
 343    for (unsigned i = 0; i < Elements(_mesa_glsl_supported_extensions); ++i) {
 344       if (strcmp(name, _mesa_glsl_supported_extensions[i].name) == 0) {
 345          return &_mesa_glsl_supported_extensions[i];
 346       }
 347    }
 348    return NULL;
 349 }
 350
 351
 352 bool
 353 _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
 354                              const char *behavior_string, YYLTYPE *behavior_locp,
 355                              _mesa_glsl_parse_state *state)
 356 {
 357    ext_behavior behavior;
 358    if (strcmp(behavior_string, "warn") == 0) {
 359       behavior = extension_warn;
 360    } else if (strcmp(behavior_string, "require") == 0) {
 361       behavior = extension_require;
 362    } else if (strcmp(behavior_string, "enable") == 0) {
 363       behavior = extension_enable;
 364    } else if (strcmp(behavior_string, "disable") == 0) {
 365       behavior = extension_disable;
 366    } else {
 367       _mesa_glsl_error(behavior_locp, state,
 368                        "Unknown extension behavior `%s'",
 369                        behavior_string);
 370       return false;
 371    }
 372
 373    if (strcmp(name, "all") == 0) {
 374       if ((behavior == extension_enable) || (behavior == extension_require)) {
 375          _mesa_glsl_error(name_locp, state, "Cannot %s all extensions",
 376                           (behavior == extension_enable)
 377                           ? "enable" : "require");
 378          return false;
 379       } else {
 380          for (unsigned i = 0;
 381               i < Elements(_mesa_glsl_supported_extensions); ++i) {
 382             const _mesa_glsl_extension *extension
 383                = &_mesa_glsl_supported_extensions[i];
 384             if (extension->compatible_with_state(state)) {
 385                _mesa_glsl_supported_extensions[i].set_flags(state, behavior);
 386             }
 387          }
 388       }
 389    } else {
 390       const _mesa_glsl_extension *extension = find_extension(name);
 391       if (extension && extension->compatible_with_state(state)) {
 392          extension->set_flags(state, behavior);
 393       } else {
 394          static const char *const fmt = "extension `%s' unsupported in %s shader";
 395
 396          if (behavior == extension_require) {
 397             _mesa_glsl_error(name_locp, state, fmt,
 398                              name, _mesa_glsl_shader_target_name(state->target));
 399             return false;
 400          } else {
 401             _mesa_glsl_warning(name_locp, state, fmt,
 402                                name, _mesa_glsl_shader_target_name(state->target));
 403          }
 404       }
 405    }
 406
 407    return true;
 408 }
 409
 410 void
 411 _mesa_ast_type_qualifier_print(const struct ast_type_qualifier *q)
 412 {
 413    if (q->flags.q.constant)
 414       printf("const ");
 415
 416    if (q->flags.q.invariant)
 417       printf("invariant ");
 418
 419    if (q->flags.q.attribute)
 420       printf("attribute ");
 421
 422    if (q->flags.q.varying)
 423       printf("varying ");
 424
 425    if (q->flags.q.in && q->flags.q.out)
 426       printf("inout ");
 427    else {
 428       if (q->flags.q.in)
 429          printf("in ");
 430
 431       if (q->flags.q.out)
 432          printf("out ");
 433    }
 434
 435    if (q->flags.q.centroid)
 436       printf("centroid ");
 437    if (q->flags.q.uniform)
 438       printf("uniform ");
 439    if (q->flags.q.smooth)
 440       printf("smooth ");
 441    if (q->flags.q.flat)
 442       printf("flat ");
 443    if (q->flags.q.noperspective)
 444       printf("noperspective ");
 445 }
 446
 447
 448 void
 449 ast_node::print(void) const
 450 {
 451    printf("unhandled node ");
 452 }
 453
 454
 455 ast_node::ast_node(void)
 456 {
 457    this->location.source = 0;
 458    this->location.line = 0;
 459    this->location.column = 0;
 460 }
 461
 462
 463 static void
 464 ast_opt_array_size_print(bool is_array, const ast_expression *array_size)
 465 {
 466    if (is_array) {
 467       printf("[ ");
 468
 469       if (array_size)
 470          array_size->print();
 471
 472       printf("] ");
 473    }
 474 }
 475
 476
 477 void
 478 ast_compound_statement::print(void) const
 479 {
 480    printf("{\n");
 481
 482    foreach_list_const(n, &this->statements) {
 483       ast_node *ast = exec_node_data(ast_node, n, link);
 484       ast->print();
 485    }
 486
 487    printf("}\n");
 488 }
 489
 490
 491 ast_compound_statement::ast_compound_statement(int new_scope,
 492                                                ast_node *statements)
 493 {
 494    this->new_scope = new_scope;
 495
 496    if (statements != NULL) {
 497       this->statements.push_degenerate_list_at_head(&statements->link);
 498    }
 499 }
 500
 501
 502 void
 503 ast_expression::print(void) const
 504 {
 505    switch (oper) {
 506    case ast_assign:
 507    case ast_mul_assign:
 508    case ast_div_assign:
 509    case ast_mod_assign:
 510    case ast_add_assign:
 511    case ast_sub_assign:
 512    case ast_ls_assign:
 513    case ast_rs_assign:
 514    case ast_and_assign:
 515    case ast_xor_assign:
 516    case ast_or_assign:
 517       subexpressions[0]->print();
 518       printf("%s ", operator_string(oper));
 519       subexpressions[1]->print();
 520       break;
 521
 522    case ast_field_selection:
 523       subexpressions[0]->print();
 524       printf(". %s ", primary_expression.identifier);
 525       break;
 526
 527    case ast_plus:
 528    case ast_neg:
 529    case ast_bit_not:
 530    case ast_logic_not:
 531    case ast_pre_inc:
 532    case ast_pre_dec:
 533       printf("%s ", operator_string(oper));
 534       subexpressions[0]->print();
 535       break;
 536
 537    case ast_post_inc:
 538    case ast_post_dec:
 539       subexpressions[0]->print();
 540       printf("%s ", operator_string(oper));
 541       break;
 542
 543    case ast_conditional:
 544       subexpressions[0]->print();
 545       printf("? ");
 546       subexpressions[1]->print();
 547       printf(": ");
 548       subexpressions[2]->print();
 549       break;
 550
 551    case ast_array_index:
 552       subexpressions[0]->print();
 553       printf("[ ");
 554       subexpressions[1]->print();
 555       printf("] ");
 556       break;
 557
 558    case ast_function_call: {
 559       subexpressions[0]->print();
 560       printf("( ");
 561
 562       foreach_list_const (n, &this->expressions) {
 563          if (n != this->expressions.get_head())
 564             printf(", ");
 565
 566          ast_node *ast = exec_node_data(ast_node, n, link);
 567          ast->print();
 568       }
 569
 570       printf(") ");
 571       break;
 572    }
 573
 574    case ast_identifier:
 575       printf("%s ", primary_expression.identifier);
 576       break;
 577
 578    case ast_int_constant:
 579       printf("%d ", primary_expression.int_constant);
 580       break;
 581
 582    case ast_uint_constant:
 583       printf("%u ", primary_expression.uint_constant);
 584       break;
 585
 586    case ast_float_constant:
 587       printf("%f ", primary_expression.float_constant);
 588       break;
 589
 590    case ast_bool_constant:
 591       printf("%s ",
 592              primary_expression.bool_constant
 593              ? "true" : "false");
 594       break;
 595
 596    case ast_sequence: {
 597       printf("( ");
 598       foreach_list_const(n, & this->expressions) {
 599          if (n != this->expressions.get_head())
 600             printf(", ");
 601
 602          ast_node *ast = exec_node_data(ast_node, n, link);
 603          ast->print();
 604       }
 605       printf(") ");
 606       break;
 607    }
 608
 609    default:
 610       assert(0);
 611       break;
 612    }
 613 }
 614
 615 ast_expression::ast_expression(int oper,
 616                                ast_expression *ex0,
 617                                ast_expression *ex1,
 618                                ast_expression *ex2)
 619 {
 620    this->oper = ast_operators(oper);
 621    this->subexpressions[0] = ex0;
 622    this->subexpressions[1] = ex1;
 623    this->subexpressions[2] = ex2;
 624 }
 625
 626
 627 void
 628 ast_expression_statement::print(void) const
 629 {
 630    if (expression)
 631       expression->print();
 632
 633    printf("; ");
 634 }
 635
 636
 637 ast_expression_statement::ast_expression_statement(ast_expression *ex) :
 638    expression(ex)
 639 {
 640    /* empty */
 641 }
 642
 643
 644 void
 645 ast_function::print(void) const
 646 {
 647    return_type->print();
 648    printf(" %s (", identifier);
 649
 650    foreach_list_const(n, & this->parameters) {
 651       ast_node *ast = exec_node_data(ast_node, n, link);
 652       ast->print();
 653    }
 654
 655    printf(")");
 656 }
 657
 658
 659 ast_function::ast_function(void)
 660    : is_definition(false), signature(NULL)
 661 {
 662    /* empty */
 663 }
 664
 665
 666 void
 667 ast_fully_specified_type::print(void) const
 668 {
 669    _mesa_ast_type_qualifier_print(& qualifier);
 670    specifier->print();
 671 }
 672
 673
 674 void
 675 ast_parameter_declarator::print(void) const
 676 {
 677    type->print();
 678    if (identifier)
 679       printf("%s ", identifier);
 680    ast_opt_array_size_print(is_array, array_size);
 681 }
 682
 683
 684 void
 685 ast_function_definition::print(void) const
 686 {
 687    prototype->print();
 688    body->print();
 689 }
 690
 691
 692 void
 693 ast_declaration::print(void) const
 694 {
 695    printf("%s ", identifier);
 696    ast_opt_array_size_print(is_array, array_size);
 697
 698    if (initializer) {
 699       printf("= ");
 700       initializer->print();
 701    }
 702 }
 703
 704
 705 ast_declaration::ast_declaration(char *identifier, int is_array,
 706                                  ast_expression *array_size,
 707                                  ast_expression *initializer)
 708 {
 709    this->identifier = identifier;
 710    this->is_array = is_array;
 711    this->array_size = array_size;
 712    this->initializer = initializer;
 713 }
 714
 715
 716 void
 717 ast_declarator_list::print(void) const
 718 {
 719    assert(type || invariant);
 720
 721    if (type)
 722       type->print();
 723    else
 724       printf("invariant ");
 725
 726    foreach_list_const (ptr, & this->declarations) {
 727       if (ptr != this->declarations.get_head())
 728          printf(", ");
 729
 730       ast_node *ast = exec_node_data(ast_node, ptr, link);
 731       ast->print();
 732    }
 733
 734    printf("; ");
 735 }
 736
 737
 738 ast_declarator_list::ast_declarator_list(ast_fully_specified_type *type)
 739 {
 740    this->type = type;
 741    this->invariant = false;
 742 }
 743
 744 void
 745 ast_jump_statement::print(void) const
 746 {
 747    switch (mode) {
 748    case ast_continue:
 749       printf("continue; ");
 750       break;
 751    case ast_break:
 752       printf("break; ");
 753       break;
 754    case ast_return:
 755       printf("return ");
 756       if (opt_return_value)
 757          opt_return_value->print();
 758
 759       printf("; ");
 760       break;
 761    case ast_discard:
 762       printf("discard; ");
 763       break;
 764    }
 765 }
 766
 767
 768 ast_jump_statement::ast_jump_statement(int mode, ast_expression *return_value)
 769 {
 770    this->mode = ast_jump_modes(mode);
 771
 772    if (mode == ast_return)
 773       opt_return_value = return_value;
 774 }
 775
 776
 777 void
 778 ast_selection_statement::print(void) const
 779 {
 780    printf("if ( ");
 781    condition->print();
 782    printf(") ");
 783
 784    then_statement->print();
 785
 786    if (else_statement) {
 787       printf("else ");
 788       else_statement->print();
 789    }
 790
 791 }
 792
 793
 794 ast_selection_statement::ast_selection_statement(ast_expression *condition,
 795                                                  ast_node *then_statement,
 796                                                  ast_node *else_statement)
 797 {
 798    this->condition = condition;
 799    this->then_statement = then_statement;
 800    this->else_statement = else_statement;
 801 }
 802
 803
 804 void
 805 ast_iteration_statement::print(void) const
 806 {
 807    switch (mode) {
 808    case ast_for:
 809       printf("for( ");
 810       if (init_statement)
 811          init_statement->print();
 812       printf("; ");
 813
 814       if (condition)
 815          condition->print();
 816       printf("; ");
 817
 818       if (rest_expression)
 819          rest_expression->print();
 820       printf(") ");
 821
 822       body->print();
 823       break;
 824
 825    case ast_while:
 826       printf("while ( ");
 827       if (condition)
 828          condition->print();
 829       printf(") ");
 830       body->print();
 831       break;
 832
 833    case ast_do_while:
 834       printf("do ");
 835       body->print();
 836       printf("while ( ");
 837       if (condition)
 838          condition->print();
 839       printf("); ");
 840       break;
 841    }
 842 }
 843
 844
 845 ast_iteration_statement::ast_iteration_statement(int mode,
 846                                                  ast_node *init,
 847                                                  ast_node *condition,
 848                                                  ast_expression *rest_expression,
 849                                                  ast_node *body)
 850 {
 851    this->mode = ast_iteration_modes(mode);
 852    this->init_statement = init;
 853    this->condition = condition;
 854    this->rest_expression = rest_expression;
 855    this->body = body;
 856 }
 857
 858
 859 void
 860 ast_struct_specifier::print(void) const
 861 {
 862    printf("struct %s { ", name);
 863    foreach_list_const(n, &this->declarations) {
 864       ast_node *ast = exec_node_data(ast_node, n, link);
 865       ast->print();
 866    }
 867    printf("} ");
 868 }
 869
 870
 871 ast_struct_specifier::ast_struct_specifier(char *identifier,
 872                                            ast_node *declarator_list)
 873 {
 874    if (identifier == NULL) {
 875       static unsigned anon_count = 1;
 876       identifier = ralloc_asprintf(this, "#anon_struct_%04x", anon_count);
 877       anon_count++;
 878    }
 879    name = identifier;
 880    this->declarations.push_degenerate_list_at_head(&declarator_list->link);
 881 }
 882
 883 bool
 884 do_common_optimization(exec_list *ir, bool linked, unsigned max_unroll_iterations)
 885 {
 886    GLboolean progress = GL_FALSE;
 887
 888    progress = lower_instructions(ir, SUB_TO_ADD_NEG) || progress;
 889
 890    if (linked) {
 891       progress = do_function_inlining(ir) || progress;
 892       progress = do_dead_functions(ir) || progress;
 893    }
 894    progress = do_structure_splitting(ir) || progress;
 895    progress = do_if_simplification(ir) || progress;
 896    progress = do_discard_simplification(ir) || progress;
 897    progress = do_copy_propagation(ir) || progress;
 898    progress = do_copy_propagation_elements(ir) || progress;
 899    if (linked)
 900       progress = do_dead_code(ir) || progress;
 901    else
 902       progress = do_dead_code_unlinked(ir) || progress;
 903    progress = do_dead_code_local(ir) || progress;
 904    progress = do_tree_grafting(ir) || progress;
 905    progress = do_constant_propagation(ir) || progress;
 906    if (linked)
 907       progress = do_constant_variable(ir) || progress;
 908    else
 909       progress = do_constant_variable_unlinked(ir) || progress;
 910    progress = do_constant_folding(ir) || progress;
 911    progress = do_algebraic(ir) || progress;
 912    progress = do_lower_jumps(ir) || progress;
 913    progress = do_vec_index_to_swizzle(ir) || progress;
 914    progress = do_swizzle_swizzle(ir) || progress;
 915    progress = do_noop_swizzle(ir) || progress;
 916
 917    progress = optimize_redundant_jumps(ir) || progress;
 918
 919    loop_state *ls = analyze_loop_variables(ir);
 920    if (ls->loop_found) {
 921       progress = set_loop_controls(ir, ls) || progress;
 922       progress = unroll_loops(ir, ls, max_unroll_iterations) || progress;
 923    }
 924    delete ls;
 925
 926    return progress;
 927 }
 928
 929 extern "C" {
 930
 931 /**
 932  * To be called at GL teardown time, this frees compiler datastructures.
 933  *
 934  * After calling this, any previously compiled shaders and shader
 935  * programs would be invalid.  So this should happen at approximately
 936  * program exit.
 937  */
 938 void
 939 _mesa_destroy_shader_compiler(void)
 940 {
 941    _mesa_destroy_shader_compiler_caches();
 942
 943    _mesa_glsl_release_types();
 944 }
 945
 946 /**
 947  * Releases compiler caches to trade off performance for memory.
 948  *
 949  * Intended to be used with glReleaseShaderCompiler().
 950  */
 951 void
 952 _mesa_destroy_shader_compiler_caches(void)
 953 {
 954    _mesa_glsl_release_functions();
 955 }
 956
 957 }