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 #include "main/context.h"
  31 }
  32
  33 #include "ralloc.h"
  34 #include "ast.h"
  35 #include "glsl_parser_extras.h"
  36 #include "glsl_parser.h"
  37 #include "ir_optimization.h"
  38 #include "loop_analysis.h"
  39
  40 _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
  41                                                GLenum target, void *mem_ctx)
  42  : ctx(_ctx)
  43 {
  44    switch (target) {
  45    case GL_VERTEX_SHADER:   this->target = vertex_shader; break;
  46    case GL_FRAGMENT_SHADER: this->target = fragment_shader; break;
  47    case GL_GEOMETRY_SHADER: this->target = geometry_shader; break;
  48    }
  49
  50    this->scanner = NULL;
  51    this->translation_unit.make_empty();
  52    this->symbols = new(mem_ctx) glsl_symbol_table;
  53    this->info_log = ralloc_strdup(mem_ctx, "");
  54    this->error = false;
  55    this->loop_nesting_ast = NULL;
  56    this->switch_state.switch_nesting_ast = NULL;
  57
  58    this->num_builtins_to_link = 0;
  59
  60    /* Set default language version and extensions */
  61    this->language_version = 110;
  62    this->es_shader = false;
  63    this->ARB_texture_rectangle_enable = true;
  64
  65    /* OpenGL ES 2.0 has different defaults from desktop GL. */
  66    if (ctx->API == API_OPENGLES2) {
  67       this->language_version = 100;
  68       this->es_shader = true;
  69       this->ARB_texture_rectangle_enable = false;
  70    }
  71
  72    this->extensions = &ctx->Extensions;
  73
  74    this->Const.MaxLights = ctx->Const.MaxLights;
  75    this->Const.MaxClipPlanes = ctx->Const.MaxClipPlanes;
  76    this->Const.MaxTextureUnits = ctx->Const.MaxTextureUnits;
  77    this->Const.MaxTextureCoords = ctx->Const.MaxTextureCoordUnits;
  78    this->Const.MaxVertexAttribs = ctx->Const.VertexProgram.MaxAttribs;
  79    this->Const.MaxVertexUniformComponents = ctx->Const.VertexProgram.MaxUniformComponents;
  80    this->Const.MaxVaryingFloats = ctx->Const.MaxVarying * 4;
  81    this->Const.MaxVertexTextureImageUnits = ctx->Const.MaxVertexTextureImageUnits;
  82    this->Const.MaxCombinedTextureImageUnits = ctx->Const.MaxCombinedTextureImageUnits;
  83    this->Const.MaxTextureImageUnits = ctx->Const.MaxTextureImageUnits;
  84    this->Const.MaxFragmentUniformComponents = ctx->Const.FragmentProgram.MaxUniformComponents;
  85
  86    this->Const.MaxDrawBuffers = ctx->Const.MaxDrawBuffers;
  87
  88    const unsigned lowest_version =
  89       (ctx->API == API_OPENGLES2) || ctx->Extensions.ARB_ES2_compatibility
  90       ? 100 : 110;
  91    const unsigned highest_version =
  92       _mesa_is_desktop_gl(ctx) ? ctx->Const.GLSLVersion : 100;
  93    char *supported = ralloc_strdup(this, "");
  94
  95    for (unsigned ver = lowest_version; ver <= highest_version; ver += 10) {
  96       const char *const prefix = (ver == lowest_version)
  97          ? ""
  98          : ((ver == highest_version) ? ", and " : ", ");
  99
 100       ralloc_asprintf_append(& supported, "%s%d.%02d%s",
 101                              prefix,
 102                              ver / 100, ver % 100,
 103                              (ver == 100) ? " ES" : "");
 104    }
 105
 106    this->supported_version_string = supported;
 107
 108    if (ctx->Const.ForceGLSLExtensionsWarn)
 109       _mesa_glsl_process_extension("all", NULL, "warn", NULL, this);
 110
 111    this->default_uniform_qualifier = new(this) ast_type_qualifier();
 112    this->default_uniform_qualifier->flags.q.shared = 1;
 113    this->default_uniform_qualifier->flags.q.column_major = 1;
 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 /* This helper function will append the given message to the shader's
 130    info log and report it via GL_ARB_debug_output. Per that extension,
 131    'type' is one of the enum values classifying the message, and
 132    'id' is the implementation-defined ID of the given message. */
 133 static void
 134 _mesa_glsl_msg(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 135                GLenum type, GLuint id, const char *fmt, va_list ap)
 136 {
 137    bool error = (type == GL_DEBUG_TYPE_ERROR_ARB);
 138
 139    assert(state->info_log != NULL);
 140
 141    /* Get the offset that the new message will be written to. */
 142    int msg_offset = strlen(state->info_log);
 143
 144    ralloc_asprintf_append(&state->info_log, "%u:%u(%u): %s: ",
 145                                             locp->source,
 146                                             locp->first_line,
 147                                             locp->first_column,
 148                                             error ? "error" : "warning");
 149    ralloc_vasprintf_append(&state->info_log, fmt, ap);
 150
 151    const char *const msg = &state->info_log[msg_offset];
 152    struct gl_context *ctx = state->ctx;
 153    /* Report the error via GL_ARB_debug_output. */
 154    if (error)
 155       _mesa_shader_debug(ctx, type, id, msg, strlen(msg));
 156
 157    ralloc_strcat(&state->info_log, "\n");
 158 }
 159
 160 void
 161 _mesa_glsl_error(YYLTYPE *locp, _mesa_glsl_parse_state *state,
 162                  const char *fmt, ...)
 163 {
 164    va_list ap;
 165    GLenum type = GL_DEBUG_TYPE_ERROR_ARB;
 166
 167    state->error = true;
 168
 169    va_start(ap, fmt);
 170    _mesa_glsl_msg(locp, state, type, SHADER_ERROR_UNKNOWN, fmt, ap);
 171    va_end(ap);
 172 }
 173
 174
 175 void
 176 _mesa_glsl_warning(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 177                    const char *fmt, ...)
 178 {
 179    va_list ap;
 180    GLenum type = GL_DEBUG_TYPE_OTHER_ARB;
 181
 182    va_start(ap, fmt);
 183    _mesa_glsl_msg(locp, state, type, 0, fmt, ap);
 184    va_end(ap);
 185 }
 186
 187
 188 /**
 189  * Enum representing the possible behaviors that can be specified in
 190  * an #extension directive.
 191  */
 192 enum ext_behavior {
 193    extension_disable,
 194    extension_enable,
 195    extension_require,
 196    extension_warn
 197 };
 198
 199 /**
 200  * Element type for _mesa_glsl_supported_extensions
 201  */
 202 struct _mesa_glsl_extension {
 203    /**
 204     * Name of the extension when referred to in a GLSL extension
 205     * statement
 206     */
 207    const char *name;
 208
 209    /** True if this extension is available to vertex shaders */
 210    bool avail_in_VS;
 211
 212    /** True if this extension is available to geometry shaders */
 213    bool avail_in_GS;
 214
 215    /** True if this extension is available to fragment shaders */
 216    bool avail_in_FS;
 217
 218    /** True if this extension is available to desktop GL shaders */
 219    bool avail_in_GL;
 220
 221    /** True if this extension is available to GLES shaders */
 222    bool avail_in_ES;
 223
 224    /**
 225     * Flag in the gl_extensions struct indicating whether this
 226     * extension is supported by the driver, or
 227     * &gl_extensions::dummy_true if supported by all drivers.
 228     *
 229     * Note: the type (GLboolean gl_extensions::*) is a "pointer to
 230     * member" type, the type-safe alternative to the "offsetof" macro.
 231     * In a nutshell:
 232     *
 233     * - foo bar::* p declares p to be an "offset" to a field of type
 234     *   foo that exists within struct bar
 235     * - &bar::baz computes the "offset" of field baz within struct bar
 236     * - x.*p accesses the field of x that exists at "offset" p
 237     * - x->*p is equivalent to (*x).*p
 238     */
 239    const GLboolean gl_extensions::* supported_flag;
 240
 241    /**
 242     * Flag in the _mesa_glsl_parse_state struct that should be set
 243     * when this extension is enabled.
 244     *
 245     * See note in _mesa_glsl_extension::supported_flag about "pointer
 246     * to member" types.
 247     */
 248    bool _mesa_glsl_parse_state::* enable_flag;
 249
 250    /**
 251     * Flag in the _mesa_glsl_parse_state struct that should be set
 252     * when the shader requests "warn" behavior for this extension.
 253     *
 254     * See note in _mesa_glsl_extension::supported_flag about "pointer
 255     * to member" types.
 256     */
 257    bool _mesa_glsl_parse_state::* warn_flag;
 258
 259
 260    bool compatible_with_state(const _mesa_glsl_parse_state *state) const;
 261    void set_flags(_mesa_glsl_parse_state *state, ext_behavior behavior) const;
 262 };
 263
 264 #define EXT(NAME, VS, GS, FS, GL, ES, SUPPORTED_FLAG)                   \
 265    { "GL_" #NAME, VS, GS, FS, GL, ES, &gl_extensions::SUPPORTED_FLAG,   \
 266          &_mesa_glsl_parse_state::NAME##_enable,                        \
 267          &_mesa_glsl_parse_state::NAME##_warn }
 268
 269 /**
 270  * Table of extensions that can be enabled/disabled within a shader,
 271  * and the conditions under which they are supported.
 272  */
 273 static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
 274    /*                                  target availability  API availability */
 275    /* name                             VS     GS     FS     GL     ES         supported flag */
 276    EXT(ARB_conservative_depth,         false, false, true,  true,  false,     ARB_conservative_depth),
 277    EXT(ARB_draw_buffers,               false, false, true,  true,  false,     dummy_true),
 278    EXT(ARB_draw_instanced,             true,  false, false, true,  false,     ARB_draw_instanced),
 279    EXT(ARB_explicit_attrib_location,   true,  false, true,  true,  false,     ARB_explicit_attrib_location),
 280    EXT(ARB_fragment_coord_conventions, true,  false, true,  true,  false,     ARB_fragment_coord_conventions),
 281    EXT(ARB_texture_rectangle,          true,  false, true,  true,  false,     dummy_true),
 282    EXT(EXT_texture_array,              true,  false, true,  true,  false,     EXT_texture_array),
 283    EXT(ARB_shader_texture_lod,         true,  false, true,  true,  false,     ARB_shader_texture_lod),
 284    EXT(ARB_shader_stencil_export,      false, false, true,  true,  false,     ARB_shader_stencil_export),
 285    EXT(AMD_conservative_depth,         false, false, true,  true,  false,     ARB_conservative_depth),
 286    EXT(AMD_shader_stencil_export,      false, false, true,  true,  false,     ARB_shader_stencil_export),
 287    EXT(OES_texture_3D,                 true,  false, true,  false, true,      EXT_texture3D),
 288    EXT(OES_EGL_image_external,         true,  false, true,  false, true,      OES_EGL_image_external),
 289    EXT(ARB_shader_bit_encoding,        true,  true,  true,  true,  false,     ARB_shader_bit_encoding),
 290    EXT(ARB_uniform_buffer_object,      true,  false, true,  true,  false,     ARB_uniform_buffer_object),
 291    EXT(OES_standard_derivatives,       false, false, true,  false,  true,     OES_standard_derivatives),
 292 };
 293
 294 #undef EXT
 295
 296
 297 /**
 298  * Determine whether a given extension is compatible with the target,
 299  * API, and extension information in the current parser state.
 300  */
 301 bool _mesa_glsl_extension::compatible_with_state(const _mesa_glsl_parse_state *
 302                                                  state) const
 303 {
 304    /* Check that this extension matches the type of shader we are
 305     * compiling to.
 306     */
 307    switch (state->target) {
 308    case vertex_shader:
 309       if (!this->avail_in_VS) {
 310          return false;
 311       }
 312       break;
 313    case geometry_shader:
 314       if (!this->avail_in_GS) {
 315          return false;
 316       }
 317       break;
 318    case fragment_shader:
 319       if (!this->avail_in_FS) {
 320          return false;
 321       }
 322       break;
 323    default:
 324       assert (!"Unrecognized shader target");
 325       return false;
 326    }
 327
 328    /* Check that this extension matches whether we are compiling
 329     * for desktop GL or GLES.
 330     */
 331    if (state->es_shader) {
 332       if (!this->avail_in_ES) return false;
 333    } else {
 334       if (!this->avail_in_GL) return false;
 335    }
 336
 337    /* Check that this extension is supported by the OpenGL
 338     * implementation.
 339     *
 340     * Note: the ->* operator indexes into state->extensions by the
 341     * offset this->supported_flag.  See
 342     * _mesa_glsl_extension::supported_flag for more info.
 343     */
 344    return state->extensions->*(this->supported_flag);
 345 }
 346
 347 /**
 348  * Set the appropriate flags in the parser state to establish the
 349  * given behavior for this extension.
 350  */
 351 void _mesa_glsl_extension::set_flags(_mesa_glsl_parse_state *state,
 352                                      ext_behavior behavior) const
 353 {
 354    /* Note: the ->* operator indexes into state by the
 355     * offsets this->enable_flag and this->warn_flag.  See
 356     * _mesa_glsl_extension::supported_flag for more info.
 357     */
 358    state->*(this->enable_flag) = (behavior != extension_disable);
 359    state->*(this->warn_flag)   = (behavior == extension_warn);
 360 }
 361
 362 /**
 363  * Find an extension by name in _mesa_glsl_supported_extensions.  If
 364  * the name is not found, return NULL.
 365  */
 366 static const _mesa_glsl_extension *find_extension(const char *name)
 367 {
 368    for (unsigned i = 0; i < Elements(_mesa_glsl_supported_extensions); ++i) {
 369       if (strcmp(name, _mesa_glsl_supported_extensions[i].name) == 0) {
 370          return &_mesa_glsl_supported_extensions[i];
 371       }
 372    }
 373    return NULL;
 374 }
 375
 376
 377 bool
 378 _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
 379                              const char *behavior_string, YYLTYPE *behavior_locp,
 380                              _mesa_glsl_parse_state *state)
 381 {
 382    ext_behavior behavior;
 383    if (strcmp(behavior_string, "warn") == 0) {
 384       behavior = extension_warn;
 385    } else if (strcmp(behavior_string, "require") == 0) {
 386       behavior = extension_require;
 387    } else if (strcmp(behavior_string, "enable") == 0) {
 388       behavior = extension_enable;
 389    } else if (strcmp(behavior_string, "disable") == 0) {
 390       behavior = extension_disable;
 391    } else {
 392       _mesa_glsl_error(behavior_locp, state,
 393                        "Unknown extension behavior `%s'",
 394                        behavior_string);
 395       return false;
 396    }
 397
 398    if (strcmp(name, "all") == 0) {
 399       if ((behavior == extension_enable) || (behavior == extension_require)) {
 400          _mesa_glsl_error(name_locp, state, "Cannot %s all extensions",
 401                           (behavior == extension_enable)
 402                           ? "enable" : "require");
 403          return false;
 404       } else {
 405          for (unsigned i = 0;
 406               i < Elements(_mesa_glsl_supported_extensions); ++i) {
 407             const _mesa_glsl_extension *extension
 408                = &_mesa_glsl_supported_extensions[i];
 409             if (extension->compatible_with_state(state)) {
 410                _mesa_glsl_supported_extensions[i].set_flags(state, behavior);
 411             }
 412          }
 413       }
 414    } else {
 415       const _mesa_glsl_extension *extension = find_extension(name);
 416       if (extension && extension->compatible_with_state(state)) {
 417          extension->set_flags(state, behavior);
 418       } else {
 419          static const char *const fmt = "extension `%s' unsupported in %s shader";
 420
 421          if (behavior == extension_require) {
 422             _mesa_glsl_error(name_locp, state, fmt,
 423                              name, _mesa_glsl_shader_target_name(state->target));
 424             return false;
 425          } else {
 426             _mesa_glsl_warning(name_locp, state, fmt,
 427                                name, _mesa_glsl_shader_target_name(state->target));
 428          }
 429       }
 430    }
 431
 432    return true;
 433 }
 434
 435 void
 436 _mesa_ast_type_qualifier_print(const struct ast_type_qualifier *q)
 437 {
 438    if (q->flags.q.constant)
 439       printf("const ");
 440
 441    if (q->flags.q.invariant)
 442       printf("invariant ");
 443
 444    if (q->flags.q.attribute)
 445       printf("attribute ");
 446
 447    if (q->flags.q.varying)
 448       printf("varying ");
 449
 450    if (q->flags.q.in && q->flags.q.out)
 451       printf("inout ");
 452    else {
 453       if (q->flags.q.in)
 454          printf("in ");
 455
 456       if (q->flags.q.out)
 457          printf("out ");
 458    }
 459
 460    if (q->flags.q.centroid)
 461       printf("centroid ");
 462    if (q->flags.q.uniform)
 463       printf("uniform ");
 464    if (q->flags.q.smooth)
 465       printf("smooth ");
 466    if (q->flags.q.flat)
 467       printf("flat ");
 468    if (q->flags.q.noperspective)
 469       printf("noperspective ");
 470 }
 471
 472
 473 void
 474 ast_node::print(void) const
 475 {
 476    printf("unhandled node ");
 477 }
 478
 479
 480 ast_node::ast_node(void)
 481 {
 482    this->location.source = 0;
 483    this->location.line = 0;
 484    this->location.column = 0;
 485 }
 486
 487
 488 static void
 489 ast_opt_array_size_print(bool is_array, const ast_expression *array_size)
 490 {
 491    if (is_array) {
 492       printf("[ ");
 493
 494       if (array_size)
 495          array_size->print();
 496
 497       printf("] ");
 498    }
 499 }
 500
 501
 502 void
 503 ast_compound_statement::print(void) const
 504 {
 505    printf("{\n");
 506
 507    foreach_list_const(n, &this->statements) {
 508       ast_node *ast = exec_node_data(ast_node, n, link);
 509       ast->print();
 510    }
 511
 512    printf("}\n");
 513 }
 514
 515
 516 ast_compound_statement::ast_compound_statement(int new_scope,
 517                                                ast_node *statements)
 518 {
 519    this->new_scope = new_scope;
 520
 521    if (statements != NULL) {
 522       this->statements.push_degenerate_list_at_head(&statements->link);
 523    }
 524 }
 525
 526
 527 void
 528 ast_expression::print(void) const
 529 {
 530    switch (oper) {
 531    case ast_assign:
 532    case ast_mul_assign:
 533    case ast_div_assign:
 534    case ast_mod_assign:
 535    case ast_add_assign:
 536    case ast_sub_assign:
 537    case ast_ls_assign:
 538    case ast_rs_assign:
 539    case ast_and_assign:
 540    case ast_xor_assign:
 541    case ast_or_assign:
 542       subexpressions[0]->print();
 543       printf("%s ", operator_string(oper));
 544       subexpressions[1]->print();
 545       break;
 546
 547    case ast_field_selection:
 548       subexpressions[0]->print();
 549       printf(". %s ", primary_expression.identifier);
 550       break;
 551
 552    case ast_plus:
 553    case ast_neg:
 554    case ast_bit_not:
 555    case ast_logic_not:
 556    case ast_pre_inc:
 557    case ast_pre_dec:
 558       printf("%s ", operator_string(oper));
 559       subexpressions[0]->print();
 560       break;
 561
 562    case ast_post_inc:
 563    case ast_post_dec:
 564       subexpressions[0]->print();
 565       printf("%s ", operator_string(oper));
 566       break;
 567
 568    case ast_conditional:
 569       subexpressions[0]->print();
 570       printf("? ");
 571       subexpressions[1]->print();
 572       printf(": ");
 573       subexpressions[2]->print();
 574       break;
 575
 576    case ast_array_index:
 577       subexpressions[0]->print();
 578       printf("[ ");
 579       subexpressions[1]->print();
 580       printf("] ");
 581       break;
 582
 583    case ast_function_call: {
 584       subexpressions[0]->print();
 585       printf("( ");
 586
 587       foreach_list_const (n, &this->expressions) {
 588          if (n != this->expressions.get_head())
 589             printf(", ");
 590
 591          ast_node *ast = exec_node_data(ast_node, n, link);
 592          ast->print();
 593       }
 594
 595       printf(") ");
 596       break;
 597    }
 598
 599    case ast_identifier:
 600       printf("%s ", primary_expression.identifier);
 601       break;
 602
 603    case ast_int_constant:
 604       printf("%d ", primary_expression.int_constant);
 605       break;
 606
 607    case ast_uint_constant:
 608       printf("%u ", primary_expression.uint_constant);
 609       break;
 610
 611    case ast_float_constant:
 612       printf("%f ", primary_expression.float_constant);
 613       break;
 614
 615    case ast_bool_constant:
 616       printf("%s ",
 617              primary_expression.bool_constant
 618              ? "true" : "false");
 619       break;
 620
 621    case ast_sequence: {
 622       printf("( ");
 623       foreach_list_const(n, & this->expressions) {
 624          if (n != this->expressions.get_head())
 625             printf(", ");
 626
 627          ast_node *ast = exec_node_data(ast_node, n, link);
 628          ast->print();
 629       }
 630       printf(") ");
 631       break;
 632    }
 633
 634    default:
 635       assert(0);
 636       break;
 637    }
 638 }
 639
 640 ast_expression::ast_expression(int oper,
 641                                ast_expression *ex0,
 642                                ast_expression *ex1,
 643                                ast_expression *ex2)
 644 {
 645    this->oper = ast_operators(oper);
 646    this->subexpressions[0] = ex0;
 647    this->subexpressions[1] = ex1;
 648    this->subexpressions[2] = ex2;
 649    this->non_lvalue_description = NULL;
 650 }
 651
 652
 653 void
 654 ast_expression_statement::print(void) const
 655 {
 656    if (expression)
 657       expression->print();
 658
 659    printf("; ");
 660 }
 661
 662
 663 ast_expression_statement::ast_expression_statement(ast_expression *ex) :
 664    expression(ex)
 665 {
 666    /* empty */
 667 }
 668
 669
 670 void
 671 ast_function::print(void) const
 672 {
 673    return_type->print();
 674    printf(" %s (", identifier);
 675
 676    foreach_list_const(n, & this->parameters) {
 677       ast_node *ast = exec_node_data(ast_node, n, link);
 678       ast->print();
 679    }
 680
 681    printf(")");
 682 }
 683
 684
 685 ast_function::ast_function(void)
 686    : is_definition(false), signature(NULL)
 687 {
 688    /* empty */
 689 }
 690
 691
 692 void
 693 ast_fully_specified_type::print(void) const
 694 {
 695    _mesa_ast_type_qualifier_print(& qualifier);
 696    specifier->print();
 697 }
 698
 699
 700 void
 701 ast_parameter_declarator::print(void) const
 702 {
 703    type->print();
 704    if (identifier)
 705       printf("%s ", identifier);
 706    ast_opt_array_size_print(is_array, array_size);
 707 }
 708
 709
 710 void
 711 ast_function_definition::print(void) const
 712 {
 713    prototype->print();
 714    body->print();
 715 }
 716
 717
 718 void
 719 ast_declaration::print(void) const
 720 {
 721    printf("%s ", identifier);
 722    ast_opt_array_size_print(is_array, array_size);
 723
 724    if (initializer) {
 725       printf("= ");
 726       initializer->print();
 727    }
 728 }
 729
 730
 731 ast_declaration::ast_declaration(const char *identifier, int is_array,
 732                                  ast_expression *array_size,
 733                                  ast_expression *initializer)
 734 {
 735    this->identifier = identifier;
 736    this->is_array = is_array;
 737    this->array_size = array_size;
 738    this->initializer = initializer;
 739 }
 740
 741
 742 void
 743 ast_declarator_list::print(void) const
 744 {
 745    assert(type || invariant);
 746
 747    if (type)
 748       type->print();
 749    else
 750       printf("invariant ");
 751
 752    foreach_list_const (ptr, & this->declarations) {
 753       if (ptr != this->declarations.get_head())
 754          printf(", ");
 755
 756       ast_node *ast = exec_node_data(ast_node, ptr, link);
 757       ast->print();
 758    }
 759
 760    printf("; ");
 761 }
 762
 763
 764 ast_declarator_list::ast_declarator_list(ast_fully_specified_type *type)
 765 {
 766    this->type = type;
 767    this->invariant = false;
 768    this->ubo_qualifiers_valid = false;
 769 }
 770
 771 void
 772 ast_jump_statement::print(void) const
 773 {
 774    switch (mode) {
 775    case ast_continue:
 776       printf("continue; ");
 777       break;
 778    case ast_break:
 779       printf("break; ");
 780       break;
 781    case ast_return:
 782       printf("return ");
 783       if (opt_return_value)
 784          opt_return_value->print();
 785
 786       printf("; ");
 787       break;
 788    case ast_discard:
 789       printf("discard; ");
 790       break;
 791    }
 792 }
 793
 794
 795 ast_jump_statement::ast_jump_statement(int mode, ast_expression *return_value)
 796 {
 797    this->mode = ast_jump_modes(mode);
 798
 799    if (mode == ast_return)
 800       opt_return_value = return_value;
 801 }
 802
 803
 804 void
 805 ast_selection_statement::print(void) const
 806 {
 807    printf("if ( ");
 808    condition->print();
 809    printf(") ");
 810
 811    then_statement->print();
 812
 813    if (else_statement) {
 814       printf("else ");
 815       else_statement->print();
 816    }
 817
 818 }
 819
 820
 821 ast_selection_statement::ast_selection_statement(ast_expression *condition,
 822                                                  ast_node *then_statement,
 823                                                  ast_node *else_statement)
 824 {
 825    this->condition = condition;
 826    this->then_statement = then_statement;
 827    this->else_statement = else_statement;
 828 }
 829
 830
 831 void
 832 ast_switch_statement::print(void) const
 833 {
 834    printf("switch ( ");
 835    test_expression->print();
 836    printf(") ");
 837
 838    body->print();
 839 }
 840
 841
 842 ast_switch_statement::ast_switch_statement(ast_expression *test_expression,
 843                                            ast_node *body)
 844 {
 845    this->test_expression = test_expression;
 846    this->body = body;
 847 }
 848
 849
 850 void
 851 ast_switch_body::print(void) const
 852 {
 853    printf("{\n");
 854    if (stmts != NULL) {
 855       stmts->print();
 856    }
 857    printf("}\n");
 858 }
 859
 860
 861 ast_switch_body::ast_switch_body(ast_case_statement_list *stmts)
 862 {
 863    this->stmts = stmts;
 864 }
 865
 866
 867 void ast_case_label::print(void) const
 868 {
 869    if (test_value != NULL) {
 870       printf("case ");
 871       test_value->print();
 872       printf(": ");
 873    } else {
 874       printf("default: ");
 875    }
 876 }
 877
 878
 879 ast_case_label::ast_case_label(ast_expression *test_value)
 880 {
 881    this->test_value = test_value;
 882 }
 883
 884
 885 void ast_case_label_list::print(void) const
 886 {
 887    foreach_list_const(n, & this->labels) {
 888       ast_node *ast = exec_node_data(ast_node, n, link);
 889       ast->print();
 890    }
 891    printf("\n");
 892 }
 893
 894
 895 ast_case_label_list::ast_case_label_list(void)
 896 {
 897 }
 898
 899
 900 void ast_case_statement::print(void) const
 901 {
 902    labels->print();
 903    foreach_list_const(n, & this->stmts) {
 904       ast_node *ast = exec_node_data(ast_node, n, link);
 905       ast->print();
 906       printf("\n");
 907    }
 908 }
 909
 910
 911 ast_case_statement::ast_case_statement(ast_case_label_list *labels)
 912 {
 913    this->labels = labels;
 914 }
 915
 916
 917 void ast_case_statement_list::print(void) const
 918 {
 919    foreach_list_const(n, & this->cases) {
 920       ast_node *ast = exec_node_data(ast_node, n, link);
 921       ast->print();
 922    }
 923 }
 924
 925
 926 ast_case_statement_list::ast_case_statement_list(void)
 927 {
 928 }
 929
 930
 931 void
 932 ast_iteration_statement::print(void) const
 933 {
 934    switch (mode) {
 935    case ast_for:
 936       printf("for( ");
 937       if (init_statement)
 938          init_statement->print();
 939       printf("; ");
 940
 941       if (condition)
 942          condition->print();
 943       printf("; ");
 944
 945       if (rest_expression)
 946          rest_expression->print();
 947       printf(") ");
 948
 949       body->print();
 950       break;
 951
 952    case ast_while:
 953       printf("while ( ");
 954       if (condition)
 955          condition->print();
 956       printf(") ");
 957       body->print();
 958       break;
 959
 960    case ast_do_while:
 961       printf("do ");
 962       body->print();
 963       printf("while ( ");
 964       if (condition)
 965          condition->print();
 966       printf("); ");
 967       break;
 968    }
 969 }
 970
 971
 972 ast_iteration_statement::ast_iteration_statement(int mode,
 973                                                  ast_node *init,
 974                                                  ast_node *condition,
 975                                                  ast_expression *rest_expression,
 976                                                  ast_node *body)
 977 {
 978    this->mode = ast_iteration_modes(mode);
 979    this->init_statement = init;
 980    this->condition = condition;
 981    this->rest_expression = rest_expression;
 982    this->body = body;
 983 }
 984
 985
 986 void
 987 ast_struct_specifier::print(void) const
 988 {
 989    printf("struct %s { ", name);
 990    foreach_list_const(n, &this->declarations) {
 991       ast_node *ast = exec_node_data(ast_node, n, link);
 992       ast->print();
 993    }
 994    printf("} ");
 995 }
 996
 997
 998 ast_struct_specifier::ast_struct_specifier(const char *identifier,
 999                                            ast_declarator_list *declarator_list)
1000 {
1001    if (identifier == NULL) {
1002       static unsigned anon_count = 1;
1003       identifier = ralloc_asprintf(this, "#anon_struct_%04x", anon_count);
1004       anon_count++;
1005    }
1006    name = identifier;
1007    this->declarations.push_degenerate_list_at_head(&declarator_list->link);
1008 }
1009
1010 /**
1011  * Do the set of common optimizations passes
1012  *
1013  * \param ir                          List of instructions to be optimized
1014  * \param linked                      Is the shader linked?  This enables
1015  *                                    optimizations passes that remove code at
1016  *                                    global scope and could cause linking to
1017  *                                    fail.
1018  * \param uniform_locations_assigned  Have locations already been assigned for
1019  *                                    uniforms?  This prevents the declarations
1020  *                                    of unused uniforms from being removed.
1021  *                                    The setting of this flag only matters if
1022  *                                    \c linked is \c true.
1023  * \param max_unroll_iterations       Maximum number of loop iterations to be
1024  *                                    unrolled.  Setting to 0 forces all loops
1025  *                                    to be unrolled.
1026  */
1027 bool
1028 do_common_optimization(exec_list *ir, bool linked,
1029                        bool uniform_locations_assigned,
1030                        unsigned max_unroll_iterations)
1031 {
1032    GLboolean progress = GL_FALSE;
1033
1034    progress = lower_instructions(ir, SUB_TO_ADD_NEG) || progress;
1035
1036    if (linked) {
1037       progress = do_function_inlining(ir) || progress;
1038       progress = do_dead_functions(ir) || progress;
1039       progress = do_structure_splitting(ir) || progress;
1040    }
1041    progress = do_if_simplification(ir) || progress;
1042    progress = do_copy_propagation(ir) || progress;
1043    progress = do_copy_propagation_elements(ir) || progress;
1044    if (linked)
1045       progress = do_dead_code(ir, uniform_locations_assigned) || progress;
1046    else
1047       progress = do_dead_code_unlinked(ir) || progress;
1048    progress = do_dead_code_local(ir) || progress;
1049    progress = do_tree_grafting(ir) || progress;
1050    progress = do_constant_propagation(ir) || progress;
1051    if (linked)
1052       progress = do_constant_variable(ir) || progress;
1053    else
1054       progress = do_constant_variable_unlinked(ir) || progress;
1055    progress = do_constant_folding(ir) || progress;
1056    progress = do_algebraic(ir) || progress;
1057    progress = do_lower_jumps(ir) || progress;
1058    progress = do_vec_index_to_swizzle(ir) || progress;
1059    progress = do_swizzle_swizzle(ir) || progress;
1060    progress = do_noop_swizzle(ir) || progress;
1061
1062    progress = optimize_split_arrays(ir, linked) || progress;
1063    progress = optimize_redundant_jumps(ir) || progress;
1064
1065    loop_state *ls = analyze_loop_variables(ir);
1066    if (ls->loop_found) {
1067       progress = set_loop_controls(ir, ls) || progress;
1068       progress = unroll_loops(ir, ls, max_unroll_iterations) || progress;
1069    }
1070    delete ls;
1071
1072    return progress;
1073 }
1074
1075 extern "C" {
1076
1077 /**
1078  * To be called at GL teardown time, this frees compiler datastructures.
1079  *
1080  * After calling this, any previously compiled shaders and shader
1081  * programs would be invalid.  So this should happen at approximately
1082  * program exit.
1083  */
1084 void
1085 _mesa_destroy_shader_compiler(void)
1086 {
1087    _mesa_destroy_shader_compiler_caches();
1088
1089    _mesa_glsl_release_types();
1090 }
1091
1092 /**
1093  * Releases compiler caches to trade off performance for memory.
1094  *
1095  * Intended to be used with glReleaseShaderCompiler().
1096  */
1097 void
1098 _mesa_destroy_shader_compiler_caches(void)
1099 {
1100    _mesa_glsl_release_functions();
1101 }
1102
1103 }