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  : ctx(_ctx)
  42 {
  43    switch (target) {
  44    case GL_VERTEX_SHADER:   this->target = vertex_shader; break;
  45    case GL_FRAGMENT_SHADER: this->target = fragment_shader; break;
  46    case GL_GEOMETRY_SHADER: this->target = geometry_shader; break;
  47    }
  48
  49    this->scanner = NULL;
  50    this->translation_unit.make_empty();
  51    this->symbols = new(mem_ctx) glsl_symbol_table;
  52    this->info_log = ralloc_strdup(mem_ctx, "");
  53    this->error = false;
  54    this->loop_nesting_ast = NULL;
  55    this->switch_state.switch_nesting_ast = NULL;
  56
  57    this->num_builtins_to_link = 0;
  58
  59    /* Set default language version and extensions */
  60    this->language_version = 110;
  61    this->es_shader = false;
  62    this->ARB_texture_rectangle_enable = true;
  63
  64    /* OpenGL ES 2.0 has different defaults from desktop GL. */
  65    if (ctx->API == API_OPENGLES2) {
  66       this->language_version = 100;
  67       this->es_shader = true;
  68       this->ARB_texture_rectangle_enable = false;
  69    }
  70
  71    this->extensions = &ctx->Extensions;
  72
  73    this->Const.MaxLights = ctx->Const.MaxLights;
  74    this->Const.MaxClipPlanes = ctx->Const.MaxClipPlanes;
  75    this->Const.MaxTextureUnits = ctx->Const.MaxTextureUnits;
  76    this->Const.MaxTextureCoords = ctx->Const.MaxTextureCoordUnits;
  77    this->Const.MaxVertexAttribs = ctx->Const.VertexProgram.MaxAttribs;
  78    this->Const.MaxVertexUniformComponents = ctx->Const.VertexProgram.MaxUniformComponents;
  79    this->Const.MaxVaryingFloats = ctx->Const.MaxVarying * 4;
  80    this->Const.MaxVertexTextureImageUnits = ctx->Const.MaxVertexTextureImageUnits;
  81    this->Const.MaxCombinedTextureImageUnits = ctx->Const.MaxCombinedTextureImageUnits;
  82    this->Const.MaxTextureImageUnits = ctx->Const.MaxTextureImageUnits;
  83    this->Const.MaxFragmentUniformComponents = ctx->Const.FragmentProgram.MaxUniformComponents;
  84
  85    this->Const.MaxDrawBuffers = ctx->Const.MaxDrawBuffers;
  86
  87    /* Note: Once the OpenGL 3.0 'forward compatible' context or the OpenGL 3.2
  88     * Core context is supported, this logic will need change.  Older versions of
  89     * GLSL are no longer supported outside the compatibility contexts of 3.x.
  90     */
  91    this->Const.GLSL_100ES = (ctx->API == API_OPENGLES2)
  92       || ctx->Extensions.ARB_ES2_compatibility;
  93    this->Const.GLSL_110 = (ctx->API == API_OPENGL);
  94    this->Const.GLSL_120 = (ctx->API == API_OPENGL)
  95       && (ctx->Const.GLSLVersion >= 120);
  96    this->Const.GLSL_130 = (ctx->API == API_OPENGL)
  97       && (ctx->Const.GLSLVersion >= 130);
  98    this->Const.GLSL_140 = (ctx->API == API_OPENGL)
  99       && (ctx->Const.GLSLVersion >= 140);
 100
 101    const unsigned lowest_version =
 102       (ctx->API == API_OPENGLES2) || ctx->Extensions.ARB_ES2_compatibility
 103       ? 100 : 110;
 104    const unsigned highest_version =
 105       (ctx->API == API_OPENGL) ? ctx->Const.GLSLVersion : 100;
 106    char *supported = ralloc_strdup(this, "");
 107
 108    for (unsigned ver = lowest_version; ver <= highest_version; ver += 10) {
 109       const char *const prefix = (ver == lowest_version)
 110          ? ""
 111          : ((ver == highest_version) ? ", and " : ", ");
 112
 113       ralloc_asprintf_append(& supported, "%s%d.%02d%s",
 114                              prefix,
 115                              ver / 100, ver % 100,
 116                              (ver == 100) ? " ES" : "");
 117    }
 118
 119    this->supported_version_string = supported;
 120
 121    if (ctx->Const.ForceGLSLExtensionsWarn)
 122       _mesa_glsl_process_extension("all", NULL, "warn", NULL, this);
 123 }
 124
 125 const char *
 126 _mesa_glsl_shader_target_name(enum _mesa_glsl_parser_targets target)
 127 {
 128    switch (target) {
 129    case vertex_shader:   return "vertex";
 130    case fragment_shader: return "fragment";
 131    case geometry_shader: return "geometry";
 132    }
 133
 134    assert(!"Should not get here.");
 135    return "unknown";
 136 }
 137
 138 /* This helper function will append the given message to the shader's
 139    info log and report it via GL_ARB_debug_output. Per that extension,
 140    'type' is one of the enum values classifying the message, and
 141    'id' is the implementation-defined ID of the given message. */
 142 static void
 143 _mesa_glsl_msg(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 144                GLenum type, GLuint id, const char *fmt, va_list ap)
 145 {
 146    bool error = (type == GL_DEBUG_TYPE_ERROR_ARB);
 147
 148    assert(state->info_log != NULL);
 149
 150    /* Get the offset that the new message will be written to. */
 151    int msg_offset = strlen(state->info_log);
 152
 153    ralloc_asprintf_append(&state->info_log, "%u:%u(%u): %s: ",
 154                                             locp->source,
 155                                             locp->first_line,
 156                                             locp->first_column,
 157                                             error ? "error" : "warning");
 158    ralloc_vasprintf_append(&state->info_log, fmt, ap);
 159
 160    const char *const msg = &state->info_log[msg_offset];
 161    struct gl_context *ctx = state->ctx;
 162    /* Report the error via GL_ARB_debug_output. */
 163    if (error)
 164       _mesa_shader_debug(ctx, type, id, msg, strlen(msg));
 165
 166    ralloc_strcat(&state->info_log, "\n");
 167 }
 168
 169 void
 170 _mesa_glsl_error(YYLTYPE *locp, _mesa_glsl_parse_state *state,
 171                  const char *fmt, ...)
 172 {
 173    va_list ap;
 174    GLenum type = GL_DEBUG_TYPE_ERROR_ARB;
 175
 176    state->error = true;
 177
 178    va_start(ap, fmt);
 179    _mesa_glsl_msg(locp, state, type, SHADER_ERROR_UNKNOWN, fmt, ap);
 180    va_end(ap);
 181 }
 182
 183
 184 void
 185 _mesa_glsl_warning(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 186                    const char *fmt, ...)
 187 {
 188    va_list ap;
 189    GLenum type = GL_DEBUG_TYPE_OTHER_ARB;
 190
 191    va_start(ap, fmt);
 192    _mesa_glsl_msg(locp, state, type, 0, fmt, ap);
 193    va_end(ap);
 194 }
 195
 196
 197 /**
 198  * Enum representing the possible behaviors that can be specified in
 199  * an #extension directive.
 200  */
 201 enum ext_behavior {
 202    extension_disable,
 203    extension_enable,
 204    extension_require,
 205    extension_warn
 206 };
 207
 208 /**
 209  * Element type for _mesa_glsl_supported_extensions
 210  */
 211 struct _mesa_glsl_extension {
 212    /**
 213     * Name of the extension when referred to in a GLSL extension
 214     * statement
 215     */
 216    const char *name;
 217
 218    /** True if this extension is available to vertex shaders */
 219    bool avail_in_VS;
 220
 221    /** True if this extension is available to geometry shaders */
 222    bool avail_in_GS;
 223
 224    /** True if this extension is available to fragment shaders */
 225    bool avail_in_FS;
 226
 227    /** True if this extension is available to desktop GL shaders */
 228    bool avail_in_GL;
 229
 230    /** True if this extension is available to GLES shaders */
 231    bool avail_in_ES;
 232
 233    /**
 234     * Flag in the gl_extensions struct indicating whether this
 235     * extension is supported by the driver, or
 236     * &gl_extensions::dummy_true if supported by all drivers.
 237     *
 238     * Note: the type (GLboolean gl_extensions::*) is a "pointer to
 239     * member" type, the type-safe alternative to the "offsetof" macro.
 240     * In a nutshell:
 241     *
 242     * - foo bar::* p declares p to be an "offset" to a field of type
 243     *   foo that exists within struct bar
 244     * - &bar::baz computes the "offset" of field baz within struct bar
 245     * - x.*p accesses the field of x that exists at "offset" p
 246     * - x->*p is equivalent to (*x).*p
 247     */
 248    const GLboolean gl_extensions::* supported_flag;
 249
 250    /**
 251     * Flag in the _mesa_glsl_parse_state struct that should be set
 252     * when this extension is enabled.
 253     *
 254     * See note in _mesa_glsl_extension::supported_flag about "pointer
 255     * to member" types.
 256     */
 257    bool _mesa_glsl_parse_state::* enable_flag;
 258
 259    /**
 260     * Flag in the _mesa_glsl_parse_state struct that should be set
 261     * when the shader requests "warn" behavior for this extension.
 262     *
 263     * See note in _mesa_glsl_extension::supported_flag about "pointer
 264     * to member" types.
 265     */
 266    bool _mesa_glsl_parse_state::* warn_flag;
 267
 268
 269    bool compatible_with_state(const _mesa_glsl_parse_state *state) const;
 270    void set_flags(_mesa_glsl_parse_state *state, ext_behavior behavior) const;
 271 };
 272
 273 #define EXT(NAME, VS, GS, FS, GL, ES, SUPPORTED_FLAG)                   \
 274    { "GL_" #NAME, VS, GS, FS, GL, ES, &gl_extensions::SUPPORTED_FLAG,   \
 275          &_mesa_glsl_parse_state::NAME##_enable,                        \
 276          &_mesa_glsl_parse_state::NAME##_warn }
 277
 278 /**
 279  * Table of extensions that can be enabled/disabled within a shader,
 280  * and the conditions under which they are supported.
 281  */
 282 static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
 283    /*                                  target availability  API availability */
 284    /* name                             VS     GS     FS     GL     ES         supported flag */
 285    EXT(ARB_conservative_depth,         false, false, true,  true,  false,     ARB_conservative_depth),
 286    EXT(ARB_draw_buffers,               false, false, true,  true,  false,     dummy_true),
 287    EXT(ARB_draw_instanced,             true,  false, false, true,  false,     ARB_draw_instanced),
 288    EXT(ARB_explicit_attrib_location,   true,  false, true,  true,  false,     ARB_explicit_attrib_location),
 289    EXT(ARB_fragment_coord_conventions, true,  false, true,  true,  false,     ARB_fragment_coord_conventions),
 290    EXT(ARB_texture_rectangle,          true,  false, true,  true,  false,     dummy_true),
 291    EXT(EXT_texture_array,              true,  false, true,  true,  false,     EXT_texture_array),
 292    EXT(ARB_shader_texture_lod,         true,  false, true,  true,  false,     ARB_shader_texture_lod),
 293    EXT(ARB_shader_stencil_export,      false, false, true,  true,  false,     ARB_shader_stencil_export),
 294    EXT(AMD_conservative_depth,         false, false, true,  true,  false,     ARB_conservative_depth),
 295    EXT(AMD_shader_stencil_export,      false, false, true,  true,  false,     ARB_shader_stencil_export),
 296    EXT(OES_texture_3D,                 true,  false, true,  false, true,      EXT_texture3D),
 297    EXT(OES_EGL_image_external,         true,  false, true,  false, true,      OES_EGL_image_external),
 298    EXT(ARB_shader_bit_encoding,        true,  true,  true,  true,  false,     ARB_shader_bit_encoding),
 299 };
 300
 301 #undef EXT
 302
 303
 304 /**
 305  * Determine whether a given extension is compatible with the target,
 306  * API, and extension information in the current parser state.
 307  */
 308 bool _mesa_glsl_extension::compatible_with_state(const _mesa_glsl_parse_state *
 309                                                  state) const
 310 {
 311    /* Check that this extension matches the type of shader we are
 312     * compiling to.
 313     */
 314    switch (state->target) {
 315    case vertex_shader:
 316       if (!this->avail_in_VS) {
 317          return false;
 318       }
 319       break;
 320    case geometry_shader:
 321       if (!this->avail_in_GS) {
 322          return false;
 323       }
 324       break;
 325    case fragment_shader:
 326       if (!this->avail_in_FS) {
 327          return false;
 328       }
 329       break;
 330    default:
 331       assert (!"Unrecognized shader target");
 332       return false;
 333    }
 334
 335    /* Check that this extension matches whether we are compiling
 336     * for desktop GL or GLES.
 337     */
 338    if (state->es_shader) {
 339       if (!this->avail_in_ES) return false;
 340    } else {
 341       if (!this->avail_in_GL) return false;
 342    }
 343
 344    /* Check that this extension is supported by the OpenGL
 345     * implementation.
 346     *
 347     * Note: the ->* operator indexes into state->extensions by the
 348     * offset this->supported_flag.  See
 349     * _mesa_glsl_extension::supported_flag for more info.
 350     */
 351    return state->extensions->*(this->supported_flag);
 352 }
 353
 354 /**
 355  * Set the appropriate flags in the parser state to establish the
 356  * given behavior for this extension.
 357  */
 358 void _mesa_glsl_extension::set_flags(_mesa_glsl_parse_state *state,
 359                                      ext_behavior behavior) const
 360 {
 361    /* Note: the ->* operator indexes into state by the
 362     * offsets this->enable_flag and this->warn_flag.  See
 363     * _mesa_glsl_extension::supported_flag for more info.
 364     */
 365    state->*(this->enable_flag) = (behavior != extension_disable);
 366    state->*(this->warn_flag)   = (behavior == extension_warn);
 367 }
 368
 369 /**
 370  * Find an extension by name in _mesa_glsl_supported_extensions.  If
 371  * the name is not found, return NULL.
 372  */
 373 static const _mesa_glsl_extension *find_extension(const char *name)
 374 {
 375    for (unsigned i = 0; i < Elements(_mesa_glsl_supported_extensions); ++i) {
 376       if (strcmp(name, _mesa_glsl_supported_extensions[i].name) == 0) {
 377          return &_mesa_glsl_supported_extensions[i];
 378       }
 379    }
 380    return NULL;
 381 }
 382
 383
 384 bool
 385 _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
 386                              const char *behavior_string, YYLTYPE *behavior_locp,
 387                              _mesa_glsl_parse_state *state)
 388 {
 389    ext_behavior behavior;
 390    if (strcmp(behavior_string, "warn") == 0) {
 391       behavior = extension_warn;
 392    } else if (strcmp(behavior_string, "require") == 0) {
 393       behavior = extension_require;
 394    } else if (strcmp(behavior_string, "enable") == 0) {
 395       behavior = extension_enable;
 396    } else if (strcmp(behavior_string, "disable") == 0) {
 397       behavior = extension_disable;
 398    } else {
 399       _mesa_glsl_error(behavior_locp, state,
 400                        "Unknown extension behavior `%s'",
 401                        behavior_string);
 402       return false;
 403    }
 404
 405    if (strcmp(name, "all") == 0) {
 406       if ((behavior == extension_enable) || (behavior == extension_require)) {
 407          _mesa_glsl_error(name_locp, state, "Cannot %s all extensions",
 408                           (behavior == extension_enable)
 409                           ? "enable" : "require");
 410          return false;
 411       } else {
 412          for (unsigned i = 0;
 413               i < Elements(_mesa_glsl_supported_extensions); ++i) {
 414             const _mesa_glsl_extension *extension
 415                = &_mesa_glsl_supported_extensions[i];
 416             if (extension->compatible_with_state(state)) {
 417                _mesa_glsl_supported_extensions[i].set_flags(state, behavior);
 418             }
 419          }
 420       }
 421    } else {
 422       const _mesa_glsl_extension *extension = find_extension(name);
 423       if (extension && extension->compatible_with_state(state)) {
 424          extension->set_flags(state, behavior);
 425       } else {
 426          static const char *const fmt = "extension `%s' unsupported in %s shader";
 427
 428          if (behavior == extension_require) {
 429             _mesa_glsl_error(name_locp, state, fmt,
 430                              name, _mesa_glsl_shader_target_name(state->target));
 431             return false;
 432          } else {
 433             _mesa_glsl_warning(name_locp, state, fmt,
 434                                name, _mesa_glsl_shader_target_name(state->target));
 435          }
 436       }
 437    }
 438
 439    return true;
 440 }
 441
 442 void
 443 _mesa_ast_type_qualifier_print(const struct ast_type_qualifier *q)
 444 {
 445    if (q->flags.q.constant)
 446       printf("const ");
 447
 448    if (q->flags.q.invariant)
 449       printf("invariant ");
 450
 451    if (q->flags.q.attribute)
 452       printf("attribute ");
 453
 454    if (q->flags.q.varying)
 455       printf("varying ");
 456
 457    if (q->flags.q.in && q->flags.q.out)
 458       printf("inout ");
 459    else {
 460       if (q->flags.q.in)
 461          printf("in ");
 462
 463       if (q->flags.q.out)
 464          printf("out ");
 465    }
 466
 467    if (q->flags.q.centroid)
 468       printf("centroid ");
 469    if (q->flags.q.uniform)
 470       printf("uniform ");
 471    if (q->flags.q.smooth)
 472       printf("smooth ");
 473    if (q->flags.q.flat)
 474       printf("flat ");
 475    if (q->flags.q.noperspective)
 476       printf("noperspective ");
 477 }
 478
 479
 480 void
 481 ast_node::print(void) const
 482 {
 483    printf("unhandled node ");
 484 }
 485
 486
 487 ast_node::ast_node(void)
 488 {
 489    this->location.source = 0;
 490    this->location.line = 0;
 491    this->location.column = 0;
 492 }
 493
 494
 495 static void
 496 ast_opt_array_size_print(bool is_array, const ast_expression *array_size)
 497 {
 498    if (is_array) {
 499       printf("[ ");
 500
 501       if (array_size)
 502          array_size->print();
 503
 504       printf("] ");
 505    }
 506 }
 507
 508
 509 void
 510 ast_compound_statement::print(void) const
 511 {
 512    printf("{\n");
 513
 514    foreach_list_const(n, &this->statements) {
 515       ast_node *ast = exec_node_data(ast_node, n, link);
 516       ast->print();
 517    }
 518
 519    printf("}\n");
 520 }
 521
 522
 523 ast_compound_statement::ast_compound_statement(int new_scope,
 524                                                ast_node *statements)
 525 {
 526    this->new_scope = new_scope;
 527
 528    if (statements != NULL) {
 529       this->statements.push_degenerate_list_at_head(&statements->link);
 530    }
 531 }
 532
 533
 534 void
 535 ast_expression::print(void) const
 536 {
 537    switch (oper) {
 538    case ast_assign:
 539    case ast_mul_assign:
 540    case ast_div_assign:
 541    case ast_mod_assign:
 542    case ast_add_assign:
 543    case ast_sub_assign:
 544    case ast_ls_assign:
 545    case ast_rs_assign:
 546    case ast_and_assign:
 547    case ast_xor_assign:
 548    case ast_or_assign:
 549       subexpressions[0]->print();
 550       printf("%s ", operator_string(oper));
 551       subexpressions[1]->print();
 552       break;
 553
 554    case ast_field_selection:
 555       subexpressions[0]->print();
 556       printf(". %s ", primary_expression.identifier);
 557       break;
 558
 559    case ast_plus:
 560    case ast_neg:
 561    case ast_bit_not:
 562    case ast_logic_not:
 563    case ast_pre_inc:
 564    case ast_pre_dec:
 565       printf("%s ", operator_string(oper));
 566       subexpressions[0]->print();
 567       break;
 568
 569    case ast_post_inc:
 570    case ast_post_dec:
 571       subexpressions[0]->print();
 572       printf("%s ", operator_string(oper));
 573       break;
 574
 575    case ast_conditional:
 576       subexpressions[0]->print();
 577       printf("? ");
 578       subexpressions[1]->print();
 579       printf(": ");
 580       subexpressions[2]->print();
 581       break;
 582
 583    case ast_array_index:
 584       subexpressions[0]->print();
 585       printf("[ ");
 586       subexpressions[1]->print();
 587       printf("] ");
 588       break;
 589
 590    case ast_function_call: {
 591       subexpressions[0]->print();
 592       printf("( ");
 593
 594       foreach_list_const (n, &this->expressions) {
 595          if (n != this->expressions.get_head())
 596             printf(", ");
 597
 598          ast_node *ast = exec_node_data(ast_node, n, link);
 599          ast->print();
 600       }
 601
 602       printf(") ");
 603       break;
 604    }
 605
 606    case ast_identifier:
 607       printf("%s ", primary_expression.identifier);
 608       break;
 609
 610    case ast_int_constant:
 611       printf("%d ", primary_expression.int_constant);
 612       break;
 613
 614    case ast_uint_constant:
 615       printf("%u ", primary_expression.uint_constant);
 616       break;
 617
 618    case ast_float_constant:
 619       printf("%f ", primary_expression.float_constant);
 620       break;
 621
 622    case ast_bool_constant:
 623       printf("%s ",
 624              primary_expression.bool_constant
 625              ? "true" : "false");
 626       break;
 627
 628    case ast_sequence: {
 629       printf("( ");
 630       foreach_list_const(n, & this->expressions) {
 631          if (n != this->expressions.get_head())
 632             printf(", ");
 633
 634          ast_node *ast = exec_node_data(ast_node, n, link);
 635          ast->print();
 636       }
 637       printf(") ");
 638       break;
 639    }
 640
 641    default:
 642       assert(0);
 643       break;
 644    }
 645 }
 646
 647 ast_expression::ast_expression(int oper,
 648                                ast_expression *ex0,
 649                                ast_expression *ex1,
 650                                ast_expression *ex2)
 651 {
 652    this->oper = ast_operators(oper);
 653    this->subexpressions[0] = ex0;
 654    this->subexpressions[1] = ex1;
 655    this->subexpressions[2] = ex2;
 656    this->non_lvalue_description = NULL;
 657 }
 658
 659
 660 void
 661 ast_expression_statement::print(void) const
 662 {
 663    if (expression)
 664       expression->print();
 665
 666    printf("; ");
 667 }
 668
 669
 670 ast_expression_statement::ast_expression_statement(ast_expression *ex) :
 671    expression(ex)
 672 {
 673    /* empty */
 674 }
 675
 676
 677 void
 678 ast_function::print(void) const
 679 {
 680    return_type->print();
 681    printf(" %s (", identifier);
 682
 683    foreach_list_const(n, & this->parameters) {
 684       ast_node *ast = exec_node_data(ast_node, n, link);
 685       ast->print();
 686    }
 687
 688    printf(")");
 689 }
 690
 691
 692 ast_function::ast_function(void)
 693    : is_definition(false), signature(NULL)
 694 {
 695    /* empty */
 696 }
 697
 698
 699 void
 700 ast_fully_specified_type::print(void) const
 701 {
 702    _mesa_ast_type_qualifier_print(& qualifier);
 703    specifier->print();
 704 }
 705
 706
 707 void
 708 ast_parameter_declarator::print(void) const
 709 {
 710    type->print();
 711    if (identifier)
 712       printf("%s ", identifier);
 713    ast_opt_array_size_print(is_array, array_size);
 714 }
 715
 716
 717 void
 718 ast_function_definition::print(void) const
 719 {
 720    prototype->print();
 721    body->print();
 722 }
 723
 724
 725 void
 726 ast_declaration::print(void) const
 727 {
 728    printf("%s ", identifier);
 729    ast_opt_array_size_print(is_array, array_size);
 730
 731    if (initializer) {
 732       printf("= ");
 733       initializer->print();
 734    }
 735 }
 736
 737
 738 ast_declaration::ast_declaration(const char *identifier, int is_array,
 739                                  ast_expression *array_size,
 740                                  ast_expression *initializer)
 741 {
 742    this->identifier = identifier;
 743    this->is_array = is_array;
 744    this->array_size = array_size;
 745    this->initializer = initializer;
 746 }
 747
 748
 749 void
 750 ast_declarator_list::print(void) const
 751 {
 752    assert(type || invariant);
 753
 754    if (type)
 755       type->print();
 756    else
 757       printf("invariant ");
 758
 759    foreach_list_const (ptr, & this->declarations) {
 760       if (ptr != this->declarations.get_head())
 761          printf(", ");
 762
 763       ast_node *ast = exec_node_data(ast_node, ptr, link);
 764       ast->print();
 765    }
 766
 767    printf("; ");
 768 }
 769
 770
 771 ast_declarator_list::ast_declarator_list(ast_fully_specified_type *type)
 772 {
 773    this->type = type;
 774    this->invariant = false;
 775 }
 776
 777 void
 778 ast_jump_statement::print(void) const
 779 {
 780    switch (mode) {
 781    case ast_continue:
 782       printf("continue; ");
 783       break;
 784    case ast_break:
 785       printf("break; ");
 786       break;
 787    case ast_return:
 788       printf("return ");
 789       if (opt_return_value)
 790          opt_return_value->print();
 791
 792       printf("; ");
 793       break;
 794    case ast_discard:
 795       printf("discard; ");
 796       break;
 797    }
 798 }
 799
 800
 801 ast_jump_statement::ast_jump_statement(int mode, ast_expression *return_value)
 802 {
 803    this->mode = ast_jump_modes(mode);
 804
 805    if (mode == ast_return)
 806       opt_return_value = return_value;
 807 }
 808
 809
 810 void
 811 ast_selection_statement::print(void) const
 812 {
 813    printf("if ( ");
 814    condition->print();
 815    printf(") ");
 816
 817    then_statement->print();
 818
 819    if (else_statement) {
 820       printf("else ");
 821       else_statement->print();
 822    }
 823
 824 }
 825
 826
 827 ast_selection_statement::ast_selection_statement(ast_expression *condition,
 828                                                  ast_node *then_statement,
 829                                                  ast_node *else_statement)
 830 {
 831    this->condition = condition;
 832    this->then_statement = then_statement;
 833    this->else_statement = else_statement;
 834 }
 835
 836
 837 void
 838 ast_switch_statement::print(void) const
 839 {
 840    printf("switch ( ");
 841    test_expression->print();
 842    printf(") ");
 843
 844    body->print();
 845 }
 846
 847
 848 ast_switch_statement::ast_switch_statement(ast_expression *test_expression,
 849                                            ast_node *body)
 850 {
 851    this->test_expression = test_expression;
 852    this->body = body;
 853 }
 854
 855
 856 void
 857 ast_switch_body::print(void) const
 858 {
 859    printf("{\n");
 860    if (stmts != NULL) {
 861       stmts->print();
 862    }
 863    printf("}\n");
 864 }
 865
 866
 867 ast_switch_body::ast_switch_body(ast_case_statement_list *stmts)
 868 {
 869    this->stmts = stmts;
 870 }
 871
 872
 873 void ast_case_label::print(void) const
 874 {
 875    if (test_value != NULL) {
 876       printf("case ");
 877       test_value->print();
 878       printf(": ");
 879    } else {
 880       printf("default: ");
 881    }
 882 }
 883
 884
 885 ast_case_label::ast_case_label(ast_expression *test_value)
 886 {
 887    this->test_value = test_value;
 888 }
 889
 890
 891 void ast_case_label_list::print(void) const
 892 {
 893    foreach_list_const(n, & this->labels) {
 894       ast_node *ast = exec_node_data(ast_node, n, link);
 895       ast->print();
 896    }
 897    printf("\n");
 898 }
 899
 900
 901 ast_case_label_list::ast_case_label_list(void)
 902 {
 903 }
 904
 905
 906 void ast_case_statement::print(void) const
 907 {
 908    labels->print();
 909    foreach_list_const(n, & this->stmts) {
 910       ast_node *ast = exec_node_data(ast_node, n, link);
 911       ast->print();
 912       printf("\n");
 913    }
 914 }
 915
 916
 917 ast_case_statement::ast_case_statement(ast_case_label_list *labels)
 918 {
 919    this->labels = labels;
 920 }
 921
 922
 923 void ast_case_statement_list::print(void) const
 924 {
 925    foreach_list_const(n, & this->cases) {
 926       ast_node *ast = exec_node_data(ast_node, n, link);
 927       ast->print();
 928    }
 929 }
 930
 931
 932 ast_case_statement_list::ast_case_statement_list(void)
 933 {
 934 }
 935
 936
 937 void
 938 ast_iteration_statement::print(void) const
 939 {
 940    switch (mode) {
 941    case ast_for:
 942       printf("for( ");
 943       if (init_statement)
 944          init_statement->print();
 945       printf("; ");
 946
 947       if (condition)
 948          condition->print();
 949       printf("; ");
 950
 951       if (rest_expression)
 952          rest_expression->print();
 953       printf(") ");
 954
 955       body->print();
 956       break;
 957
 958    case ast_while:
 959       printf("while ( ");
 960       if (condition)
 961          condition->print();
 962       printf(") ");
 963       body->print();
 964       break;
 965
 966    case ast_do_while:
 967       printf("do ");
 968       body->print();
 969       printf("while ( ");
 970       if (condition)
 971          condition->print();
 972       printf("); ");
 973       break;
 974    }
 975 }
 976
 977
 978 ast_iteration_statement::ast_iteration_statement(int mode,
 979                                                  ast_node *init,
 980                                                  ast_node *condition,
 981                                                  ast_expression *rest_expression,
 982                                                  ast_node *body)
 983 {
 984    this->mode = ast_iteration_modes(mode);
 985    this->init_statement = init;
 986    this->condition = condition;
 987    this->rest_expression = rest_expression;
 988    this->body = body;
 989 }
 990
 991
 992 void
 993 ast_struct_specifier::print(void) const
 994 {
 995    printf("struct %s { ", name);
 996    foreach_list_const(n, &this->declarations) {
 997       ast_node *ast = exec_node_data(ast_node, n, link);
 998       ast->print();
 999    }
1000    printf("} ");
1001 }
1002
1003
1004 ast_struct_specifier::ast_struct_specifier(const char *identifier,
1005                                            ast_node *declarator_list)
1006 {
1007    if (identifier == NULL) {
1008       static unsigned anon_count = 1;
1009       identifier = ralloc_asprintf(this, "#anon_struct_%04x", anon_count);
1010       anon_count++;
1011    }
1012    name = identifier;
1013    this->declarations.push_degenerate_list_at_head(&declarator_list->link);
1014 }
1015
1016 /**
1017  * Do the set of common optimizations passes
1018  *
1019  * \param ir                          List of instructions to be optimized
1020  * \param linked                      Is the shader linked?  This enables
1021  *                                    optimizations passes that remove code at
1022  *                                    global scope and could cause linking to
1023  *                                    fail.
1024  * \param uniform_locations_assigned  Have locations already been assigned for
1025  *                                    uniforms?  This prevents the declarations
1026  *                                    of unused uniforms from being removed.
1027  *                                    The setting of this flag only matters if
1028  *                                    \c linked is \c true.
1029  * \param max_unroll_iterations       Maximum number of loop iterations to be
1030  *                                    unrolled.  Setting to 0 forces all loops
1031  *                                    to be unrolled.
1032  */
1033 bool
1034 do_common_optimization(exec_list *ir, bool linked,
1035                        bool uniform_locations_assigned,
1036                        unsigned max_unroll_iterations)
1037 {
1038    GLboolean progress = GL_FALSE;
1039
1040    progress = lower_instructions(ir, SUB_TO_ADD_NEG) || progress;
1041
1042    if (linked) {
1043       progress = do_function_inlining(ir) || progress;
1044       progress = do_dead_functions(ir) || progress;
1045       progress = do_structure_splitting(ir) || progress;
1046    }
1047    progress = do_if_simplification(ir) || progress;
1048    progress = do_copy_propagation(ir) || progress;
1049    progress = do_copy_propagation_elements(ir) || progress;
1050    if (linked)
1051       progress = do_dead_code(ir, uniform_locations_assigned) || progress;
1052    else
1053       progress = do_dead_code_unlinked(ir) || progress;
1054    progress = do_dead_code_local(ir) || progress;
1055    progress = do_tree_grafting(ir) || progress;
1056    progress = do_constant_propagation(ir) || progress;
1057    if (linked)
1058       progress = do_constant_variable(ir) || progress;
1059    else
1060       progress = do_constant_variable_unlinked(ir) || progress;
1061    progress = do_constant_folding(ir) || progress;
1062    progress = do_algebraic(ir) || progress;
1063    progress = do_lower_jumps(ir) || progress;
1064    progress = do_vec_index_to_swizzle(ir) || progress;
1065    progress = do_swizzle_swizzle(ir) || progress;
1066    progress = do_noop_swizzle(ir) || progress;
1067
1068    progress = optimize_split_arrays(ir, linked) || progress;
1069    progress = optimize_redundant_jumps(ir) || progress;
1070
1071    loop_state *ls = analyze_loop_variables(ir);
1072    if (ls->loop_found) {
1073       progress = set_loop_controls(ir, ls) || progress;
1074       progress = unroll_loops(ir, ls, max_unroll_iterations) || progress;
1075    }
1076    delete ls;
1077
1078    return progress;
1079 }
1080
1081 extern "C" {
1082
1083 /**
1084  * To be called at GL teardown time, this frees compiler datastructures.
1085  *
1086  * After calling this, any previously compiled shaders and shader
1087  * programs would be invalid.  So this should happen at approximately
1088  * program exit.
1089  */
1090 void
1091 _mesa_destroy_shader_compiler(void)
1092 {
1093    _mesa_destroy_shader_compiler_caches();
1094
1095    _mesa_glsl_release_types();
1096 }
1097
1098 /**
1099  * Releases compiler caches to trade off performance for memory.
1100  *
1101  * Intended to be used with glReleaseShaderCompiler().
1102  */
1103 void
1104 _mesa_destroy_shader_compiler_caches(void)
1105 {
1106    _mesa_glsl_release_functions();
1107 }
1108
1109 }