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 /**
  41  * Format a short human-readable description of the given GLSL version.
  42  */
  43 const char *
  44 glsl_compute_version_string(void *mem_ctx, bool is_es, unsigned version)
  45 {
  46    return ralloc_asprintf(mem_ctx, "GLSL%s %d.%02d", is_es ? " ES" : "",
  47                           version / 100, version % 100);
  48 }
  49
  50
  51 static unsigned known_desktop_glsl_versions[] =
  52    { 110, 120, 130, 140, 150, 330, 400, 410, 420, 430 };
  53
  54
  55 _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
  56                                                GLenum target, void *mem_ctx)
  57  : ctx(_ctx)
  58 {
  59    switch (target) {
  60    case GL_VERTEX_SHADER:   this->target = vertex_shader; break;
  61    case GL_FRAGMENT_SHADER: this->target = fragment_shader; break;
  62    case GL_GEOMETRY_SHADER: this->target = geometry_shader; break;
  63    }
  64
  65    this->scanner = NULL;
  66    this->translation_unit.make_empty();
  67    this->symbols = new(mem_ctx) glsl_symbol_table;
  68    this->info_log = ralloc_strdup(mem_ctx, "");
  69    this->error = false;
  70    this->loop_nesting_ast = NULL;
  71    this->switch_state.switch_nesting_ast = NULL;
  72
  73    this->num_builtins_to_link = 0;
  74
  75    /* Set default language version and extensions */
  76    this->language_version = 110;
  77    this->es_shader = false;
  78    this->ARB_texture_rectangle_enable = true;
  79
  80    /* OpenGL ES 2.0 has different defaults from desktop GL. */
  81    if (ctx->API == API_OPENGLES2) {
  82       this->language_version = 100;
  83       this->es_shader = true;
  84       this->ARB_texture_rectangle_enable = false;
  85    }
  86
  87    this->extensions = &ctx->Extensions;
  88
  89    this->Const.MaxLights = ctx->Const.MaxLights;
  90    this->Const.MaxClipPlanes = ctx->Const.MaxClipPlanes;
  91    this->Const.MaxTextureUnits = ctx->Const.MaxTextureUnits;
  92    this->Const.MaxTextureCoords = ctx->Const.MaxTextureCoordUnits;
  93    this->Const.MaxVertexAttribs = ctx->Const.VertexProgram.MaxAttribs;
  94    this->Const.MaxVertexUniformComponents = ctx->Const.VertexProgram.MaxUniformComponents;
  95    this->Const.MaxVaryingFloats = ctx->Const.MaxVarying * 4;
  96    this->Const.MaxVertexTextureImageUnits = ctx->Const.MaxVertexTextureImageUnits;
  97    this->Const.MaxCombinedTextureImageUnits = ctx->Const.MaxCombinedTextureImageUnits;
  98    this->Const.MaxTextureImageUnits = ctx->Const.MaxTextureImageUnits;
  99    this->Const.MaxFragmentUniformComponents = ctx->Const.FragmentProgram.MaxUniformComponents;
 100    this->Const.MinProgramTexelOffset = ctx->Const.MinProgramTexelOffset;
 101    this->Const.MaxProgramTexelOffset = ctx->Const.MaxProgramTexelOffset;
 102
 103    this->Const.MaxDrawBuffers = ctx->Const.MaxDrawBuffers;
 104
 105    /* Populate the list of supported GLSL versions */
 106    /* FINISHME: Once the OpenGL 3.0 'forward compatible' context or
 107     * the OpenGL 3.2 Core context is supported, this logic will need
 108     * change.  Older versions of GLSL are no longer supported
 109     * outside the compatibility contexts of 3.x.
 110     */
 111    this->num_supported_versions = 0;
 112    if (_mesa_is_desktop_gl(ctx)) {
 113       for (unsigned i = 0; i < ARRAY_SIZE(known_desktop_glsl_versions); i++) {
 114          if (known_desktop_glsl_versions[i] <= ctx->Const.GLSLVersion) {
 115             this->supported_versions[this->num_supported_versions].ver
 116                = known_desktop_glsl_versions[i];
 117             this->supported_versions[this->num_supported_versions].es = false;
 118             this->num_supported_versions++;
 119          }
 120       }
 121    }
 122    if (ctx->API == API_OPENGLES2 || ctx->Extensions.ARB_ES2_compatibility) {
 123       this->supported_versions[this->num_supported_versions].ver = 100;
 124       this->supported_versions[this->num_supported_versions].es = true;
 125       this->num_supported_versions++;
 126    }
 127    if (_mesa_is_gles3(ctx) || ctx->Extensions.ARB_ES3_compatibility) {
 128       this->supported_versions[this->num_supported_versions].ver = 300;
 129       this->supported_versions[this->num_supported_versions].es = true;
 130       this->num_supported_versions++;
 131    }
 132    assert(this->num_supported_versions
 133           <= ARRAY_SIZE(this->supported_versions));
 134
 135    /* Create a string for use in error messages to tell the user which GLSL
 136     * versions are supported.
 137     */
 138    char *supported = ralloc_strdup(this, "");
 139    for (unsigned i = 0; i < this->num_supported_versions; i++) {
 140       unsigned ver = this->supported_versions[i].ver;
 141       const char *const prefix = (i == 0)
 142          ? ""
 143          : ((i == this->num_supported_versions - 1) ? ", and " : ", ");
 144       const char *const suffix = (this->supported_versions[i].es) ? " ES" : "";
 145
 146       ralloc_asprintf_append(& supported, "%s%u.%02u%s",
 147                              prefix,
 148                              ver / 100, ver % 100,
 149                              suffix);
 150    }
 151
 152    this->supported_version_string = supported;
 153
 154    if (ctx->Const.ForceGLSLExtensionsWarn)
 155       _mesa_glsl_process_extension("all", NULL, "warn", NULL, this);
 156
 157    this->default_uniform_qualifier = new(this) ast_type_qualifier();
 158    this->default_uniform_qualifier->flags.q.shared = 1;
 159    this->default_uniform_qualifier->flags.q.column_major = 1;
 160 }
 161
 162 /**
 163  * Determine whether the current GLSL version is sufficiently high to support
 164  * a certain feature, and generate an error message if it isn't.
 165  *
 166  * \param required_glsl_version and \c required_glsl_es_version are
 167  * interpreted as they are in _mesa_glsl_parse_state::is_version().
 168  *
 169  * \param locp is the parser location where the error should be reported.
 170  *
 171  * \param fmt (and additional arguments) constitute a printf-style error
 172  * message to report if the version check fails.  Information about the
 173  * current and required GLSL versions will be appended.  So, for example, if
 174  * the GLSL version being compiled is 1.20, and check_version(130, 300, locp,
 175  * "foo unsupported") is called, the error message will be "foo unsupported in
 176  * GLSL 1.20 (GLSL 1.30 or GLSL 3.00 ES required)".
 177  */
 178 bool
 179 _mesa_glsl_parse_state::check_version(unsigned required_glsl_version,
 180                                       unsigned required_glsl_es_version,
 181                                       YYLTYPE *locp, const char *fmt, ...)
 182 {
 183    if (this->is_version(required_glsl_version, required_glsl_es_version))
 184       return true;
 185
 186    va_list args;
 187    va_start(args, fmt);
 188    char *problem = ralloc_vasprintf(this, fmt, args);
 189    va_end(args);
 190    const char *glsl_version_string
 191       = glsl_compute_version_string(this, false, required_glsl_version);
 192    const char *glsl_es_version_string
 193       = glsl_compute_version_string(this, true, required_glsl_es_version);
 194    const char *requirement_string = "";
 195    if (required_glsl_version && required_glsl_es_version) {
 196       requirement_string = ralloc_asprintf(this, " (%s or %s required)",
 197                                            glsl_version_string,
 198                                            glsl_es_version_string);
 199    } else if (required_glsl_version) {
 200       requirement_string = ralloc_asprintf(this, " (%s required)",
 201                                            glsl_version_string);
 202    } else if (required_glsl_es_version) {
 203       requirement_string = ralloc_asprintf(this, " (%s required)",
 204                                            glsl_es_version_string);
 205    }
 206    _mesa_glsl_error(locp, this, "%s in %s%s.",
 207                     problem, this->get_version_string(),
 208                     requirement_string);
 209
 210    return false;
 211 }
 212
 213 /**
 214  * Process a GLSL #version directive.
 215  *
 216  * \param version is the integer that follows the #version token.
 217  *
 218  * \param ident is a string identifier that follows the integer, if any is
 219  * present.  Otherwise NULL.
 220  */
 221 void
 222 _mesa_glsl_parse_state::process_version_directive(YYLTYPE *locp, int version,
 223                                                   const char *ident)
 224 {
 225    bool es_token_present = false;
 226    if (ident) {
 227       if (strcmp(ident, "es") == 0) {
 228          es_token_present = true;
 229       } else {
 230          _mesa_glsl_error(locp, this,
 231                           "Illegal text following version number\n");
 232       }
 233    }
 234
 235    this->es_shader = es_token_present;
 236    if (version == 100) {
 237       if (es_token_present) {
 238          _mesa_glsl_error(locp, this,
 239                           "GLSL 1.00 ES should be selected using "
 240                           "`#version 100'\n");
 241       } else {
 242          this->es_shader = true;
 243       }
 244    }
 245
 246    this->language_version = version;
 247
 248    bool supported = false;
 249    for (unsigned i = 0; i < this->num_supported_versions; i++) {
 250       if (this->supported_versions[i].ver == (unsigned) version
 251           && this->supported_versions[i].es == this->es_shader) {
 252          supported = true;
 253          break;
 254       }
 255    }
 256
 257    if (!supported) {
 258       _mesa_glsl_error(locp, this, "%s is not supported. "
 259                        "Supported versions are: %s\n",
 260                        this->get_version_string(),
 261                        this->supported_version_string);
 262
 263       /* On exit, the language_version must be set to a valid value.
 264        * Later calls to _mesa_glsl_initialize_types will misbehave if
 265        * the version is invalid.
 266        */
 267       switch (this->ctx->API) {
 268       case API_OPENGL_COMPAT:
 269       case API_OPENGL_CORE:
 270          this->language_version = this->ctx->Const.GLSLVersion;
 271          break;
 272
 273       case API_OPENGLES:
 274          assert(!"Should not get here.");
 275          /* FALLTHROUGH */
 276
 277       case API_OPENGLES2:
 278          this->language_version = 100;
 279          break;
 280       }
 281    }
 282
 283    if (this->language_version >= 140) {
 284       this->ARB_uniform_buffer_object_enable = true;
 285    }
 286
 287    if (this->language_version == 300 && this->es_shader) {
 288       this->ARB_explicit_attrib_location_enable = true;
 289    }
 290 }
 291
 292 const char *
 293 _mesa_glsl_shader_target_name(enum _mesa_glsl_parser_targets target)
 294 {
 295    switch (target) {
 296    case vertex_shader:   return "vertex";
 297    case fragment_shader: return "fragment";
 298    case geometry_shader: return "geometry";
 299    }
 300
 301    assert(!"Should not get here.");
 302    return "unknown";
 303 }
 304
 305 /* This helper function will append the given message to the shader's
 306    info log and report it via GL_ARB_debug_output. Per that extension,
 307    'type' is one of the enum values classifying the message, and
 308    'id' is the implementation-defined ID of the given message. */
 309 static void
 310 _mesa_glsl_msg(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 311                GLenum type, const char *fmt, va_list ap)
 312 {
 313    bool error = (type == MESA_DEBUG_TYPE_ERROR);
 314    GLuint msg_id = 0;
 315
 316    assert(state->info_log != NULL);
 317
 318    /* Get the offset that the new message will be written to. */
 319    int msg_offset = strlen(state->info_log);
 320
 321    ralloc_asprintf_append(&state->info_log, "%u:%u(%u): %s: ",
 322                                             locp->source,
 323                                             locp->first_line,
 324                                             locp->first_column,
 325                                             error ? "error" : "warning");
 326    ralloc_vasprintf_append(&state->info_log, fmt, ap);
 327
 328    const char *const msg = &state->info_log[msg_offset];
 329    struct gl_context *ctx = state->ctx;
 330
 331    /* Report the error via GL_ARB_debug_output. */
 332    _mesa_shader_debug(ctx, type, &msg_id, msg, strlen(msg));
 333
 334    ralloc_strcat(&state->info_log, "\n");
 335 }
 336
 337 void
 338 _mesa_glsl_error(YYLTYPE *locp, _mesa_glsl_parse_state *state,
 339                  const char *fmt, ...)
 340 {
 341    va_list ap;
 342
 343    state->error = true;
 344
 345    va_start(ap, fmt);
 346    _mesa_glsl_msg(locp, state, MESA_DEBUG_TYPE_ERROR, fmt, ap);
 347    va_end(ap);
 348 }
 349
 350
 351 void
 352 _mesa_glsl_warning(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 353                    const char *fmt, ...)
 354 {
 355    va_list ap;
 356
 357    va_start(ap, fmt);
 358    _mesa_glsl_msg(locp, state, MESA_DEBUG_TYPE_OTHER, fmt, ap);
 359    va_end(ap);
 360 }
 361
 362
 363 /**
 364  * Enum representing the possible behaviors that can be specified in
 365  * an #extension directive.
 366  */
 367 enum ext_behavior {
 368    extension_disable,
 369    extension_enable,
 370    extension_require,
 371    extension_warn
 372 };
 373
 374 /**
 375  * Element type for _mesa_glsl_supported_extensions
 376  */
 377 struct _mesa_glsl_extension {
 378    /**
 379     * Name of the extension when referred to in a GLSL extension
 380     * statement
 381     */
 382    const char *name;
 383
 384    /** True if this extension is available to vertex shaders */
 385    bool avail_in_VS;
 386
 387    /** True if this extension is available to geometry shaders */
 388    bool avail_in_GS;
 389
 390    /** True if this extension is available to fragment shaders */
 391    bool avail_in_FS;
 392
 393    /** True if this extension is available to desktop GL shaders */
 394    bool avail_in_GL;
 395
 396    /** True if this extension is available to GLES shaders */
 397    bool avail_in_ES;
 398
 399    /**
 400     * Flag in the gl_extensions struct indicating whether this
 401     * extension is supported by the driver, or
 402     * &gl_extensions::dummy_true if supported by all drivers.
 403     *
 404     * Note: the type (GLboolean gl_extensions::*) is a "pointer to
 405     * member" type, the type-safe alternative to the "offsetof" macro.
 406     * In a nutshell:
 407     *
 408     * - foo bar::* p declares p to be an "offset" to a field of type
 409     *   foo that exists within struct bar
 410     * - &bar::baz computes the "offset" of field baz within struct bar
 411     * - x.*p accesses the field of x that exists at "offset" p
 412     * - x->*p is equivalent to (*x).*p
 413     */
 414    const GLboolean gl_extensions::* supported_flag;
 415
 416    /**
 417     * Flag in the _mesa_glsl_parse_state struct that should be set
 418     * when this extension is enabled.
 419     *
 420     * See note in _mesa_glsl_extension::supported_flag about "pointer
 421     * to member" types.
 422     */
 423    bool _mesa_glsl_parse_state::* enable_flag;
 424
 425    /**
 426     * Flag in the _mesa_glsl_parse_state struct that should be set
 427     * when the shader requests "warn" behavior for this extension.
 428     *
 429     * See note in _mesa_glsl_extension::supported_flag about "pointer
 430     * to member" types.
 431     */
 432    bool _mesa_glsl_parse_state::* warn_flag;
 433
 434
 435    bool compatible_with_state(const _mesa_glsl_parse_state *state) const;
 436    void set_flags(_mesa_glsl_parse_state *state, ext_behavior behavior) const;
 437 };
 438
 439 #define EXT(NAME, VS, GS, FS, GL, ES, SUPPORTED_FLAG)                   \
 440    { "GL_" #NAME, VS, GS, FS, GL, ES, &gl_extensions::SUPPORTED_FLAG,   \
 441          &_mesa_glsl_parse_state::NAME##_enable,                        \
 442          &_mesa_glsl_parse_state::NAME##_warn }
 443
 444 /**
 445  * Table of extensions that can be enabled/disabled within a shader,
 446  * and the conditions under which they are supported.
 447  */
 448 static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
 449    /*                                  target availability  API availability */
 450    /* name                             VS     GS     FS     GL     ES         supported flag */
 451    EXT(ARB_conservative_depth,         false, false, true,  true,  false,     ARB_conservative_depth),
 452    EXT(ARB_draw_buffers,               false, false, true,  true,  false,     dummy_true),
 453    EXT(ARB_draw_instanced,             true,  false, false, true,  false,     ARB_draw_instanced),
 454    EXT(ARB_explicit_attrib_location,   true,  false, true,  true,  false,     ARB_explicit_attrib_location),
 455    EXT(ARB_fragment_coord_conventions, true,  false, true,  true,  false,     ARB_fragment_coord_conventions),
 456    EXT(ARB_texture_rectangle,          true,  false, true,  true,  false,     dummy_true),
 457    EXT(EXT_texture_array,              true,  false, true,  true,  false,     EXT_texture_array),
 458    EXT(ARB_shader_texture_lod,         true,  false, true,  true,  false,     ARB_shader_texture_lod),
 459    EXT(ARB_shader_stencil_export,      false, false, true,  true,  false,     ARB_shader_stencil_export),
 460    EXT(AMD_conservative_depth,         false, false, true,  true,  false,     ARB_conservative_depth),
 461    EXT(AMD_shader_stencil_export,      false, false, true,  true,  false,     ARB_shader_stencil_export),
 462    EXT(OES_texture_3D,                 true,  false, true,  false, true,      EXT_texture3D),
 463    EXT(OES_EGL_image_external,         true,  false, true,  false, true,      OES_EGL_image_external),
 464    EXT(ARB_shader_bit_encoding,        true,  true,  true,  true,  false,     ARB_shader_bit_encoding),
 465    EXT(ARB_uniform_buffer_object,      true,  false, true,  true,  false,     ARB_uniform_buffer_object),
 466    EXT(OES_standard_derivatives,       false, false, true,  false,  true,     OES_standard_derivatives),
 467    EXT(ARB_texture_cube_map_array,     true,  false, true,  true,  false,     ARB_texture_cube_map_array),
 468    EXT(ARB_shading_language_packing,   true,  false, true,  true,  false,     ARB_shading_language_packing),
 469    EXT(ARB_texture_multisample,        true,  false, true,  true,  false,     ARB_texture_multisample),
 470    EXT(ARB_texture_query_lod,          false, false, true,  true,  false,     ARB_texture_query_lod),
 471 };
 472
 473 #undef EXT
 474
 475
 476 /**
 477  * Determine whether a given extension is compatible with the target,
 478  * API, and extension information in the current parser state.
 479  */
 480 bool _mesa_glsl_extension::compatible_with_state(const _mesa_glsl_parse_state *
 481                                                  state) const
 482 {
 483    /* Check that this extension matches the type of shader we are
 484     * compiling to.
 485     */
 486    switch (state->target) {
 487    case vertex_shader:
 488       if (!this->avail_in_VS) {
 489          return false;
 490       }
 491       break;
 492    case geometry_shader:
 493       if (!this->avail_in_GS) {
 494          return false;
 495       }
 496       break;
 497    case fragment_shader:
 498       if (!this->avail_in_FS) {
 499          return false;
 500       }
 501       break;
 502    default:
 503       assert (!"Unrecognized shader target");
 504       return false;
 505    }
 506
 507    /* Check that this extension matches whether we are compiling
 508     * for desktop GL or GLES.
 509     */
 510    if (state->es_shader) {
 511       if (!this->avail_in_ES) return false;
 512    } else {
 513       if (!this->avail_in_GL) return false;
 514    }
 515
 516    /* Check that this extension is supported by the OpenGL
 517     * implementation.
 518     *
 519     * Note: the ->* operator indexes into state->extensions by the
 520     * offset this->supported_flag.  See
 521     * _mesa_glsl_extension::supported_flag for more info.
 522     */
 523    return state->extensions->*(this->supported_flag);
 524 }
 525
 526 /**
 527  * Set the appropriate flags in the parser state to establish the
 528  * given behavior for this extension.
 529  */
 530 void _mesa_glsl_extension::set_flags(_mesa_glsl_parse_state *state,
 531                                      ext_behavior behavior) const
 532 {
 533    /* Note: the ->* operator indexes into state by the
 534     * offsets this->enable_flag and this->warn_flag.  See
 535     * _mesa_glsl_extension::supported_flag for more info.
 536     */
 537    state->*(this->enable_flag) = (behavior != extension_disable);
 538    state->*(this->warn_flag)   = (behavior == extension_warn);
 539 }
 540
 541 /**
 542  * Find an extension by name in _mesa_glsl_supported_extensions.  If
 543  * the name is not found, return NULL.
 544  */
 545 static const _mesa_glsl_extension *find_extension(const char *name)
 546 {
 547    for (unsigned i = 0; i < Elements(_mesa_glsl_supported_extensions); ++i) {
 548       if (strcmp(name, _mesa_glsl_supported_extensions[i].name) == 0) {
 549          return &_mesa_glsl_supported_extensions[i];
 550       }
 551    }
 552    return NULL;
 553 }
 554
 555
 556 bool
 557 _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
 558                              const char *behavior_string, YYLTYPE *behavior_locp,
 559                              _mesa_glsl_parse_state *state)
 560 {
 561    ext_behavior behavior;
 562    if (strcmp(behavior_string, "warn") == 0) {
 563       behavior = extension_warn;
 564    } else if (strcmp(behavior_string, "require") == 0) {
 565       behavior = extension_require;
 566    } else if (strcmp(behavior_string, "enable") == 0) {
 567       behavior = extension_enable;
 568    } else if (strcmp(behavior_string, "disable") == 0) {
 569       behavior = extension_disable;
 570    } else {
 571       _mesa_glsl_error(behavior_locp, state,
 572                        "Unknown extension behavior `%s'",
 573                        behavior_string);
 574       return false;
 575    }
 576
 577    if (strcmp(name, "all") == 0) {
 578       if ((behavior == extension_enable) || (behavior == extension_require)) {
 579          _mesa_glsl_error(name_locp, state, "Cannot %s all extensions",
 580                           (behavior == extension_enable)
 581                           ? "enable" : "require");
 582          return false;
 583       } else {
 584          for (unsigned i = 0;
 585               i < Elements(_mesa_glsl_supported_extensions); ++i) {
 586             const _mesa_glsl_extension *extension
 587                = &_mesa_glsl_supported_extensions[i];
 588             if (extension->compatible_with_state(state)) {
 589                _mesa_glsl_supported_extensions[i].set_flags(state, behavior);
 590             }
 591          }
 592       }
 593    } else {
 594       const _mesa_glsl_extension *extension = find_extension(name);
 595       if (extension && extension->compatible_with_state(state)) {
 596          extension->set_flags(state, behavior);
 597       } else {
 598          static const char *const fmt = "extension `%s' unsupported in %s shader";
 599
 600          if (behavior == extension_require) {
 601             _mesa_glsl_error(name_locp, state, fmt,
 602                              name, _mesa_glsl_shader_target_name(state->target));
 603             return false;
 604          } else {
 605             _mesa_glsl_warning(name_locp, state, fmt,
 606                                name, _mesa_glsl_shader_target_name(state->target));
 607          }
 608       }
 609    }
 610
 611    return true;
 612 }
 613
 614 void
 615 _mesa_ast_type_qualifier_print(const struct ast_type_qualifier *q)
 616 {
 617    if (q->flags.q.constant)
 618       printf("const ");
 619
 620    if (q->flags.q.invariant)
 621       printf("invariant ");
 622
 623    if (q->flags.q.attribute)
 624       printf("attribute ");
 625
 626    if (q->flags.q.varying)
 627       printf("varying ");
 628
 629    if (q->flags.q.in && q->flags.q.out)
 630       printf("inout ");
 631    else {
 632       if (q->flags.q.in)
 633          printf("in ");
 634
 635       if (q->flags.q.out)
 636          printf("out ");
 637    }
 638
 639    if (q->flags.q.centroid)
 640       printf("centroid ");
 641    if (q->flags.q.uniform)
 642       printf("uniform ");
 643    if (q->flags.q.smooth)
 644       printf("smooth ");
 645    if (q->flags.q.flat)
 646       printf("flat ");
 647    if (q->flags.q.noperspective)
 648       printf("noperspective ");
 649 }
 650
 651
 652 void
 653 ast_node::print(void) const
 654 {
 655    printf("unhandled node ");
 656 }
 657
 658
 659 ast_node::ast_node(void)
 660 {
 661    this->location.source = 0;
 662    this->location.line = 0;
 663    this->location.column = 0;
 664 }
 665
 666
 667 static void
 668 ast_opt_array_size_print(bool is_array, const ast_expression *array_size)
 669 {
 670    if (is_array) {
 671       printf("[ ");
 672
 673       if (array_size)
 674          array_size->print();
 675
 676       printf("] ");
 677    }
 678 }
 679
 680
 681 void
 682 ast_compound_statement::print(void) const
 683 {
 684    printf("{\n");
 685
 686    foreach_list_const(n, &this->statements) {
 687       ast_node *ast = exec_node_data(ast_node, n, link);
 688       ast->print();
 689    }
 690
 691    printf("}\n");
 692 }
 693
 694
 695 ast_compound_statement::ast_compound_statement(int new_scope,
 696                                                ast_node *statements)
 697 {
 698    this->new_scope = new_scope;
 699
 700    if (statements != NULL) {
 701       this->statements.push_degenerate_list_at_head(&statements->link);
 702    }
 703 }
 704
 705
 706 void
 707 ast_expression::print(void) const
 708 {
 709    switch (oper) {
 710    case ast_assign:
 711    case ast_mul_assign:
 712    case ast_div_assign:
 713    case ast_mod_assign:
 714    case ast_add_assign:
 715    case ast_sub_assign:
 716    case ast_ls_assign:
 717    case ast_rs_assign:
 718    case ast_and_assign:
 719    case ast_xor_assign:
 720    case ast_or_assign:
 721       subexpressions[0]->print();
 722       printf("%s ", operator_string(oper));
 723       subexpressions[1]->print();
 724       break;
 725
 726    case ast_field_selection:
 727       subexpressions[0]->print();
 728       printf(". %s ", primary_expression.identifier);
 729       break;
 730
 731    case ast_plus:
 732    case ast_neg:
 733    case ast_bit_not:
 734    case ast_logic_not:
 735    case ast_pre_inc:
 736    case ast_pre_dec:
 737       printf("%s ", operator_string(oper));
 738       subexpressions[0]->print();
 739       break;
 740
 741    case ast_post_inc:
 742    case ast_post_dec:
 743       subexpressions[0]->print();
 744       printf("%s ", operator_string(oper));
 745       break;
 746
 747    case ast_conditional:
 748       subexpressions[0]->print();
 749       printf("? ");
 750       subexpressions[1]->print();
 751       printf(": ");
 752       subexpressions[2]->print();
 753       break;
 754
 755    case ast_array_index:
 756       subexpressions[0]->print();
 757       printf("[ ");
 758       subexpressions[1]->print();
 759       printf("] ");
 760       break;
 761
 762    case ast_function_call: {
 763       subexpressions[0]->print();
 764       printf("( ");
 765
 766       foreach_list_const (n, &this->expressions) {
 767          if (n != this->expressions.get_head())
 768             printf(", ");
 769
 770          ast_node *ast = exec_node_data(ast_node, n, link);
 771          ast->print();
 772       }
 773
 774       printf(") ");
 775       break;
 776    }
 777
 778    case ast_identifier:
 779       printf("%s ", primary_expression.identifier);
 780       break;
 781
 782    case ast_int_constant:
 783       printf("%d ", primary_expression.int_constant);
 784       break;
 785
 786    case ast_uint_constant:
 787       printf("%u ", primary_expression.uint_constant);
 788       break;
 789
 790    case ast_float_constant:
 791       printf("%f ", primary_expression.float_constant);
 792       break;
 793
 794    case ast_bool_constant:
 795       printf("%s ",
 796              primary_expression.bool_constant
 797              ? "true" : "false");
 798       break;
 799
 800    case ast_sequence: {
 801       printf("( ");
 802       foreach_list_const(n, & this->expressions) {
 803          if (n != this->expressions.get_head())
 804             printf(", ");
 805
 806          ast_node *ast = exec_node_data(ast_node, n, link);
 807          ast->print();
 808       }
 809       printf(") ");
 810       break;
 811    }
 812
 813    default:
 814       assert(0);
 815       break;
 816    }
 817 }
 818
 819 ast_expression::ast_expression(int oper,
 820                                ast_expression *ex0,
 821                                ast_expression *ex1,
 822                                ast_expression *ex2)
 823 {
 824    this->oper = ast_operators(oper);
 825    this->subexpressions[0] = ex0;
 826    this->subexpressions[1] = ex1;
 827    this->subexpressions[2] = ex2;
 828    this->non_lvalue_description = NULL;
 829 }
 830
 831
 832 void
 833 ast_expression_statement::print(void) const
 834 {
 835    if (expression)
 836       expression->print();
 837
 838    printf("; ");
 839 }
 840
 841
 842 ast_expression_statement::ast_expression_statement(ast_expression *ex) :
 843    expression(ex)
 844 {
 845    /* empty */
 846 }
 847
 848
 849 void
 850 ast_function::print(void) const
 851 {
 852    return_type->print();
 853    printf(" %s (", identifier);
 854
 855    foreach_list_const(n, & this->parameters) {
 856       ast_node *ast = exec_node_data(ast_node, n, link);
 857       ast->print();
 858    }
 859
 860    printf(")");
 861 }
 862
 863
 864 ast_function::ast_function(void)
 865    : is_definition(false), signature(NULL)
 866 {
 867    /* empty */
 868 }
 869
 870
 871 void
 872 ast_fully_specified_type::print(void) const
 873 {
 874    _mesa_ast_type_qualifier_print(& qualifier);
 875    specifier->print();
 876 }
 877
 878
 879 void
 880 ast_parameter_declarator::print(void) const
 881 {
 882    type->print();
 883    if (identifier)
 884       printf("%s ", identifier);
 885    ast_opt_array_size_print(is_array, array_size);
 886 }
 887
 888
 889 void
 890 ast_function_definition::print(void) const
 891 {
 892    prototype->print();
 893    body->print();
 894 }
 895
 896
 897 void
 898 ast_declaration::print(void) const
 899 {
 900    printf("%s ", identifier);
 901    ast_opt_array_size_print(is_array, array_size);
 902
 903    if (initializer) {
 904       printf("= ");
 905       initializer->print();
 906    }
 907 }
 908
 909
 910 ast_declaration::ast_declaration(const char *identifier, int is_array,
 911                                  ast_expression *array_size,
 912                                  ast_expression *initializer)
 913 {
 914    this->identifier = identifier;
 915    this->is_array = is_array;
 916    this->array_size = array_size;
 917    this->initializer = initializer;
 918 }
 919
 920
 921 void
 922 ast_declarator_list::print(void) const
 923 {
 924    assert(type || invariant);
 925
 926    if (type)
 927       type->print();
 928    else
 929       printf("invariant ");
 930
 931    foreach_list_const (ptr, & this->declarations) {
 932       if (ptr != this->declarations.get_head())
 933          printf(", ");
 934
 935       ast_node *ast = exec_node_data(ast_node, ptr, link);
 936       ast->print();
 937    }
 938
 939    printf("; ");
 940 }
 941
 942
 943 ast_declarator_list::ast_declarator_list(ast_fully_specified_type *type)
 944 {
 945    this->type = type;
 946    this->invariant = false;
 947    this->ubo_qualifiers_valid = false;
 948 }
 949
 950 void
 951 ast_jump_statement::print(void) const
 952 {
 953    switch (mode) {
 954    case ast_continue:
 955       printf("continue; ");
 956       break;
 957    case ast_break:
 958       printf("break; ");
 959       break;
 960    case ast_return:
 961       printf("return ");
 962       if (opt_return_value)
 963          opt_return_value->print();
 964
 965       printf("; ");
 966       break;
 967    case ast_discard:
 968       printf("discard; ");
 969       break;
 970    }
 971 }
 972
 973
 974 ast_jump_statement::ast_jump_statement(int mode, ast_expression *return_value)
 975 {
 976    this->mode = ast_jump_modes(mode);
 977
 978    if (mode == ast_return)
 979       opt_return_value = return_value;
 980 }
 981
 982
 983 void
 984 ast_selection_statement::print(void) const
 985 {
 986    printf("if ( ");
 987    condition->print();
 988    printf(") ");
 989
 990    then_statement->print();
 991
 992    if (else_statement) {
 993       printf("else ");
 994       else_statement->print();
 995    }
 996
 997 }
 998
 999
1000 ast_selection_statement::ast_selection_statement(ast_expression *condition,
1001                                                  ast_node *then_statement,
1002                                                  ast_node *else_statement)
1003 {
1004    this->condition = condition;
1005    this->then_statement = then_statement;
1006    this->else_statement = else_statement;
1007 }
1008
1009
1010 void
1011 ast_switch_statement::print(void) const
1012 {
1013    printf("switch ( ");
1014    test_expression->print();
1015    printf(") ");
1016
1017    body->print();
1018 }
1019
1020
1021 ast_switch_statement::ast_switch_statement(ast_expression *test_expression,
1022                                            ast_node *body)
1023 {
1024    this->test_expression = test_expression;
1025    this->body = body;
1026 }
1027
1028
1029 void
1030 ast_switch_body::print(void) const
1031 {
1032    printf("{\n");
1033    if (stmts != NULL) {
1034       stmts->print();
1035    }
1036    printf("}\n");
1037 }
1038
1039
1040 ast_switch_body::ast_switch_body(ast_case_statement_list *stmts)
1041 {
1042    this->stmts = stmts;
1043 }
1044
1045
1046 void ast_case_label::print(void) const
1047 {
1048    if (test_value != NULL) {
1049       printf("case ");
1050       test_value->print();
1051       printf(": ");
1052    } else {
1053       printf("default: ");
1054    }
1055 }
1056
1057
1058 ast_case_label::ast_case_label(ast_expression *test_value)
1059 {
1060    this->test_value = test_value;
1061 }
1062
1063
1064 void ast_case_label_list::print(void) const
1065 {
1066    foreach_list_const(n, & this->labels) {
1067       ast_node *ast = exec_node_data(ast_node, n, link);
1068       ast->print();
1069    }
1070    printf("\n");
1071 }
1072
1073
1074 ast_case_label_list::ast_case_label_list(void)
1075 {
1076 }
1077
1078
1079 void ast_case_statement::print(void) const
1080 {
1081    labels->print();
1082    foreach_list_const(n, & this->stmts) {
1083       ast_node *ast = exec_node_data(ast_node, n, link);
1084       ast->print();
1085       printf("\n");
1086    }
1087 }
1088
1089
1090 ast_case_statement::ast_case_statement(ast_case_label_list *labels)
1091 {
1092    this->labels = labels;
1093 }
1094
1095
1096 void ast_case_statement_list::print(void) const
1097 {
1098    foreach_list_const(n, & this->cases) {
1099       ast_node *ast = exec_node_data(ast_node, n, link);
1100       ast->print();
1101    }
1102 }
1103
1104
1105 ast_case_statement_list::ast_case_statement_list(void)
1106 {
1107 }
1108
1109
1110 void
1111 ast_iteration_statement::print(void) const
1112 {
1113    switch (mode) {
1114    case ast_for:
1115       printf("for( ");
1116       if (init_statement)
1117          init_statement->print();
1118       printf("; ");
1119
1120       if (condition)
1121          condition->print();
1122       printf("; ");
1123
1124       if (rest_expression)
1125          rest_expression->print();
1126       printf(") ");
1127
1128       body->print();
1129       break;
1130
1131    case ast_while:
1132       printf("while ( ");
1133       if (condition)
1134          condition->print();
1135       printf(") ");
1136       body->print();
1137       break;
1138
1139    case ast_do_while:
1140       printf("do ");
1141       body->print();
1142       printf("while ( ");
1143       if (condition)
1144          condition->print();
1145       printf("); ");
1146       break;
1147    }
1148 }
1149
1150
1151 ast_iteration_statement::ast_iteration_statement(int mode,
1152                                                  ast_node *init,
1153                                                  ast_node *condition,
1154                                                  ast_expression *rest_expression,
1155                                                  ast_node *body)
1156 {
1157    this->mode = ast_iteration_modes(mode);
1158    this->init_statement = init;
1159    this->condition = condition;
1160    this->rest_expression = rest_expression;
1161    this->body = body;
1162 }
1163
1164
1165 void
1166 ast_struct_specifier::print(void) const
1167 {
1168    printf("struct %s { ", name);
1169    foreach_list_const(n, &this->declarations) {
1170       ast_node *ast = exec_node_data(ast_node, n, link);
1171       ast->print();
1172    }
1173    printf("} ");
1174 }
1175
1176
1177 ast_struct_specifier::ast_struct_specifier(const char *identifier,
1178                                            ast_declarator_list *declarator_list)
1179 {
1180    if (identifier == NULL) {
1181       static unsigned anon_count = 1;
1182       identifier = ralloc_asprintf(this, "#anon_struct_%04x", anon_count);
1183       anon_count++;
1184    }
1185    name = identifier;
1186    this->declarations.push_degenerate_list_at_head(&declarator_list->link);
1187 }
1188
1189 /**
1190  * Do the set of common optimizations passes
1191  *
1192  * \param ir                          List of instructions to be optimized
1193  * \param linked                      Is the shader linked?  This enables
1194  *                                    optimizations passes that remove code at
1195  *                                    global scope and could cause linking to
1196  *                                    fail.
1197  * \param uniform_locations_assigned  Have locations already been assigned for
1198  *                                    uniforms?  This prevents the declarations
1199  *                                    of unused uniforms from being removed.
1200  *                                    The setting of this flag only matters if
1201  *                                    \c linked is \c true.
1202  * \param max_unroll_iterations       Maximum number of loop iterations to be
1203  *                                    unrolled.  Setting to 0 disables loop
1204  *                                    unrolling.
1205  */
1206 bool
1207 do_common_optimization(exec_list *ir, bool linked,
1208                        bool uniform_locations_assigned,
1209                        unsigned max_unroll_iterations)
1210 {
1211    GLboolean progress = GL_FALSE;
1212
1213    progress = lower_instructions(ir, SUB_TO_ADD_NEG) || progress;
1214
1215    if (linked) {
1216       progress = do_function_inlining(ir) || progress;
1217       progress = do_dead_functions(ir) || progress;
1218       progress = do_structure_splitting(ir) || progress;
1219    }
1220    progress = do_if_simplification(ir) || progress;
1221    progress = opt_flatten_nested_if_blocks(ir) || progress;
1222    progress = do_copy_propagation(ir) || progress;
1223    progress = do_copy_propagation_elements(ir) || progress;
1224    if (linked)
1225       progress = do_dead_code(ir, uniform_locations_assigned) || progress;
1226    else
1227       progress = do_dead_code_unlinked(ir) || progress;
1228    progress = do_dead_code_local(ir) || progress;
1229    progress = do_tree_grafting(ir) || progress;
1230    progress = do_constant_propagation(ir) || progress;
1231    if (linked)
1232       progress = do_constant_variable(ir) || progress;
1233    else
1234       progress = do_constant_variable_unlinked(ir) || progress;
1235    progress = do_constant_folding(ir) || progress;
1236    progress = do_algebraic(ir) || progress;
1237    progress = do_lower_jumps(ir) || progress;
1238    progress = do_vec_index_to_swizzle(ir) || progress;
1239    progress = do_swizzle_swizzle(ir) || progress;
1240    progress = do_noop_swizzle(ir) || progress;
1241
1242    progress = optimize_split_arrays(ir, linked) || progress;
1243    progress = optimize_redundant_jumps(ir) || progress;
1244
1245    loop_state *ls = analyze_loop_variables(ir);
1246    if (ls->loop_found) {
1247       progress = set_loop_controls(ir, ls) || progress;
1248       progress = unroll_loops(ir, ls, max_unroll_iterations) || progress;
1249    }
1250    delete ls;
1251
1252    return progress;
1253 }
1254
1255 extern "C" {
1256
1257 /**
1258  * To be called at GL teardown time, this frees compiler datastructures.
1259  *
1260  * After calling this, any previously compiled shaders and shader
1261  * programs would be invalid.  So this should happen at approximately
1262  * program exit.
1263  */
1264 void
1265 _mesa_destroy_shader_compiler(void)
1266 {
1267    _mesa_destroy_shader_compiler_caches();
1268
1269    _mesa_glsl_release_types();
1270 }
1271
1272 /**
1273  * Releases compiler caches to trade off performance for memory.
1274  *
1275  * Intended to be used with glReleaseShaderCompiler().
1276  */
1277 void
1278 _mesa_destroy_shader_compiler_caches(void)
1279 {
1280    _mesa_glsl_release_functions();
1281 }
1282
1283 }