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 #include "main/shaderobj.h"
  32 }
  33
  34 #include "ralloc.h"
  35 #include "ast.h"
  36 #include "glsl_parser_extras.h"
  37 #include "glsl_parser.h"
  38 #include "ir_optimization.h"
  39 #include "loop_analysis.h"
  40
  41 /**
  42  * Format a short human-readable description of the given GLSL version.
  43  */
  44 const char *
  45 glsl_compute_version_string(void *mem_ctx, bool is_es, unsigned version)
  46 {
  47    return ralloc_asprintf(mem_ctx, "GLSL%s %d.%02d", is_es ? " ES" : "",
  48                           version / 100, version % 100);
  49 }
  50
  51
  52 static unsigned known_desktop_glsl_versions[] =
  53    { 110, 120, 130, 140, 150, 330, 400, 410, 420, 430, 440 };
  54
  55
  56 _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
  57                                                gl_shader_stage stage,
  58                                                void *mem_ctx)
  59    : ctx(_ctx), switch_state()
  60 {
  61    assert(stage < MESA_SHADER_STAGES);
  62    this->stage = stage;
  63
  64    this->scanner = NULL;
  65    this->translation_unit.make_empty();
  66    this->symbols = new(mem_ctx) glsl_symbol_table;
  67
  68    this->num_uniform_blocks = 0;
  69    this->uniform_block_array_size = 0;
  70    this->uniform_blocks = NULL;
  71
  72    this->info_log = ralloc_strdup(mem_ctx, "");
  73    this->error = false;
  74    this->loop_nesting_ast = NULL;
  75
  76    this->struct_specifier_depth = 0;
  77
  78    this->uses_builtin_functions = false;
  79
  80    /* Set default language version and extensions */
  81    this->language_version = ctx->Const.ForceGLSLVersion ?
  82                             ctx->Const.ForceGLSLVersion : 110;
  83    this->es_shader = false;
  84    this->ARB_texture_rectangle_enable = true;
  85
  86    /* OpenGL ES 2.0 has different defaults from desktop GL. */
  87    if (ctx->API == API_OPENGLES2) {
  88       this->language_version = 100;
  89       this->es_shader = true;
  90       this->ARB_texture_rectangle_enable = false;
  91    }
  92
  93    this->extensions = &ctx->Extensions;
  94
  95    this->Const.MaxLights = ctx->Const.MaxLights;
  96    this->Const.MaxClipPlanes = ctx->Const.MaxClipPlanes;
  97    this->Const.MaxTextureUnits = ctx->Const.MaxTextureUnits;
  98    this->Const.MaxTextureCoords = ctx->Const.MaxTextureCoordUnits;
  99    this->Const.MaxVertexAttribs = ctx->Const.Program[MESA_SHADER_VERTEX].MaxAttribs;
 100    this->Const.MaxVertexUniformComponents = ctx->Const.Program[MESA_SHADER_VERTEX].MaxUniformComponents;
 101    this->Const.MaxVertexTextureImageUnits = ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits;
 102    this->Const.MaxCombinedTextureImageUnits = ctx->Const.MaxCombinedTextureImageUnits;
 103    this->Const.MaxTextureImageUnits = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits;
 104    this->Const.MaxFragmentUniformComponents = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxUniformComponents;
 105    this->Const.MinProgramTexelOffset = ctx->Const.MinProgramTexelOffset;
 106    this->Const.MaxProgramTexelOffset = ctx->Const.MaxProgramTexelOffset;
 107
 108    this->Const.MaxDrawBuffers = ctx->Const.MaxDrawBuffers;
 109
 110    /* 1.50 constants */
 111    this->Const.MaxVertexOutputComponents = ctx->Const.Program[MESA_SHADER_VERTEX].MaxOutputComponents;
 112    this->Const.MaxGeometryInputComponents = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxInputComponents;
 113    this->Const.MaxGeometryOutputComponents = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxOutputComponents;
 114    this->Const.MaxFragmentInputComponents = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxInputComponents;
 115    this->Const.MaxGeometryTextureImageUnits = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits;
 116    this->Const.MaxGeometryOutputVertices = ctx->Const.MaxGeometryOutputVertices;
 117    this->Const.MaxGeometryTotalOutputComponents = ctx->Const.MaxGeometryTotalOutputComponents;
 118    this->Const.MaxGeometryUniformComponents = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxUniformComponents;
 119
 120    this->Const.MaxVertexAtomicCounters = ctx->Const.Program[MESA_SHADER_VERTEX].MaxAtomicCounters;
 121    this->Const.MaxGeometryAtomicCounters = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxAtomicCounters;
 122    this->Const.MaxFragmentAtomicCounters = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxAtomicCounters;
 123    this->Const.MaxCombinedAtomicCounters = ctx->Const.MaxCombinedAtomicCounters;
 124    this->Const.MaxAtomicBufferBindings = ctx->Const.MaxAtomicBufferBindings;
 125
 126    this->current_function = NULL;
 127    this->toplevel_ir = NULL;
 128    this->found_return = false;
 129    this->all_invariant = false;
 130    this->user_structures = NULL;
 131    this->num_user_structures = 0;
 132
 133    /* Populate the list of supported GLSL versions */
 134    /* FINISHME: Once the OpenGL 3.0 'forward compatible' context or
 135     * the OpenGL 3.2 Core context is supported, this logic will need
 136     * change.  Older versions of GLSL are no longer supported
 137     * outside the compatibility contexts of 3.x.
 138     */
 139    this->num_supported_versions = 0;
 140    if (_mesa_is_desktop_gl(ctx)) {
 141       for (unsigned i = 0; i < ARRAY_SIZE(known_desktop_glsl_versions); i++) {
 142          if (known_desktop_glsl_versions[i] <= ctx->Const.GLSLVersion) {
 143             this->supported_versions[this->num_supported_versions].ver
 144                = known_desktop_glsl_versions[i];
 145             this->supported_versions[this->num_supported_versions].es = false;
 146             this->num_supported_versions++;
 147          }
 148       }
 149    }
 150    if (ctx->API == API_OPENGLES2 || ctx->Extensions.ARB_ES2_compatibility) {
 151       this->supported_versions[this->num_supported_versions].ver = 100;
 152       this->supported_versions[this->num_supported_versions].es = true;
 153       this->num_supported_versions++;
 154    }
 155    if (_mesa_is_gles3(ctx) || ctx->Extensions.ARB_ES3_compatibility) {
 156       this->supported_versions[this->num_supported_versions].ver = 300;
 157       this->supported_versions[this->num_supported_versions].es = true;
 158       this->num_supported_versions++;
 159    }
 160    assert(this->num_supported_versions
 161           <= ARRAY_SIZE(this->supported_versions));
 162
 163    /* Create a string for use in error messages to tell the user which GLSL
 164     * versions are supported.
 165     */
 166    char *supported = ralloc_strdup(this, "");
 167    for (unsigned i = 0; i < this->num_supported_versions; i++) {
 168       unsigned ver = this->supported_versions[i].ver;
 169       const char *const prefix = (i == 0)
 170          ? ""
 171          : ((i == this->num_supported_versions - 1) ? ", and " : ", ");
 172       const char *const suffix = (this->supported_versions[i].es) ? " ES" : "";
 173
 174       ralloc_asprintf_append(& supported, "%s%u.%02u%s",
 175                              prefix,
 176                              ver / 100, ver % 100,
 177                              suffix);
 178    }
 179
 180    this->supported_version_string = supported;
 181
 182    if (ctx->Const.ForceGLSLExtensionsWarn)
 183       _mesa_glsl_process_extension("all", NULL, "warn", NULL, this);
 184
 185    this->default_uniform_qualifier = new(this) ast_type_qualifier();
 186    this->default_uniform_qualifier->flags.q.shared = 1;
 187    this->default_uniform_qualifier->flags.q.column_major = 1;
 188
 189    this->gs_input_prim_type_specified = false;
 190    this->gs_input_prim_type = GL_POINTS;
 191    this->gs_input_size = 0;
 192    this->out_qualifier = new(this) ast_type_qualifier();
 193    memset(this->atomic_counter_offsets, 0,
 194           sizeof(this->atomic_counter_offsets));
 195 }
 196
 197 /**
 198  * Determine whether the current GLSL version is sufficiently high to support
 199  * a certain feature, and generate an error message if it isn't.
 200  *
 201  * \param required_glsl_version and \c required_glsl_es_version are
 202  * interpreted as they are in _mesa_glsl_parse_state::is_version().
 203  *
 204  * \param locp is the parser location where the error should be reported.
 205  *
 206  * \param fmt (and additional arguments) constitute a printf-style error
 207  * message to report if the version check fails.  Information about the
 208  * current and required GLSL versions will be appended.  So, for example, if
 209  * the GLSL version being compiled is 1.20, and check_version(130, 300, locp,
 210  * "foo unsupported") is called, the error message will be "foo unsupported in
 211  * GLSL 1.20 (GLSL 1.30 or GLSL 3.00 ES required)".
 212  */
 213 bool
 214 _mesa_glsl_parse_state::check_version(unsigned required_glsl_version,
 215                                       unsigned required_glsl_es_version,
 216                                       YYLTYPE *locp, const char *fmt, ...)
 217 {
 218    if (this->is_version(required_glsl_version, required_glsl_es_version))
 219       return true;
 220
 221    va_list args;
 222    va_start(args, fmt);
 223    char *problem = ralloc_vasprintf(this, fmt, args);
 224    va_end(args);
 225    const char *glsl_version_string
 226       = glsl_compute_version_string(this, false, required_glsl_version);
 227    const char *glsl_es_version_string
 228       = glsl_compute_version_string(this, true, required_glsl_es_version);
 229    const char *requirement_string = "";
 230    if (required_glsl_version && required_glsl_es_version) {
 231       requirement_string = ralloc_asprintf(this, " (%s or %s required)",
 232                                            glsl_version_string,
 233                                            glsl_es_version_string);
 234    } else if (required_glsl_version) {
 235       requirement_string = ralloc_asprintf(this, " (%s required)",
 236                                            glsl_version_string);
 237    } else if (required_glsl_es_version) {
 238       requirement_string = ralloc_asprintf(this, " (%s required)",
 239                                            glsl_es_version_string);
 240    }
 241    _mesa_glsl_error(locp, this, "%s in %s%s",
 242                     problem, this->get_version_string(),
 243                     requirement_string);
 244
 245    return false;
 246 }
 247
 248 /**
 249  * Process a GLSL #version directive.
 250  *
 251  * \param version is the integer that follows the #version token.
 252  *
 253  * \param ident is a string identifier that follows the integer, if any is
 254  * present.  Otherwise NULL.
 255  */
 256 void
 257 _mesa_glsl_parse_state::process_version_directive(YYLTYPE *locp, int version,
 258                                                   const char *ident)
 259 {
 260    bool es_token_present = false;
 261    if (ident) {
 262       if (strcmp(ident, "es") == 0) {
 263          es_token_present = true;
 264       } else if (version >= 150) {
 265          if (strcmp(ident, "core") == 0) {
 266             /* Accept the token.  There's no need to record that this is
 267              * a core profile shader since that's the only profile we support.
 268              */
 269          } else if (strcmp(ident, "compatibility") == 0) {
 270             _mesa_glsl_error(locp, this,
 271                              "the compatibility profile is not supported");
 272          } else {
 273             _mesa_glsl_error(locp, this,
 274                              "\"%s\" is not a valid shading language profile; "
 275                              "if present, it must be \"core\"", ident);
 276          }
 277       } else {
 278          _mesa_glsl_error(locp, this,
 279                           "illegal text following version number");
 280       }
 281    }
 282
 283    this->es_shader = es_token_present;
 284    if (version == 100) {
 285       if (es_token_present) {
 286          _mesa_glsl_error(locp, this,
 287                           "GLSL 1.00 ES should be selected using "
 288                           "`#version 100'");
 289       } else {
 290          this->es_shader = true;
 291       }
 292    }
 293
 294    if (this->es_shader) {
 295       this->ARB_texture_rectangle_enable = false;
 296    }
 297
 298    this->language_version = version;
 299
 300    bool supported = false;
 301    for (unsigned i = 0; i < this->num_supported_versions; i++) {
 302       if (this->supported_versions[i].ver == (unsigned) version
 303           && this->supported_versions[i].es == this->es_shader) {
 304          supported = true;
 305          break;
 306       }
 307    }
 308
 309    if (!supported) {
 310       _mesa_glsl_error(locp, this, "%s is not supported. "
 311                        "Supported versions are: %s",
 312                        this->get_version_string(),
 313                        this->supported_version_string);
 314
 315       /* On exit, the language_version must be set to a valid value.
 316        * Later calls to _mesa_glsl_initialize_types will misbehave if
 317        * the version is invalid.
 318        */
 319       switch (this->ctx->API) {
 320       case API_OPENGL_COMPAT:
 321       case API_OPENGL_CORE:
 322          this->language_version = this->ctx->Const.GLSLVersion;
 323          break;
 324
 325       case API_OPENGLES:
 326          assert(!"Should not get here.");
 327          /* FALLTHROUGH */
 328
 329       case API_OPENGLES2:
 330          this->language_version = 100;
 331          break;
 332       }
 333    }
 334 }
 335
 336
 337 /**
 338  * Translate a gl_shader_stage to a short shader stage name for debug
 339  * printouts and error messages.
 340  */
 341 const char *
 342 _mesa_shader_stage_to_string(unsigned stage)
 343 {
 344    switch (stage) {
 345    case MESA_SHADER_VERTEX:   return "vertex";
 346    case MESA_SHADER_FRAGMENT: return "fragment";
 347    case MESA_SHADER_GEOMETRY: return "geometry";
 348    }
 349
 350    assert(!"Should not get here.");
 351    return "unknown";
 352 }
 353
 354 /* This helper function will append the given message to the shader's
 355    info log and report it via GL_ARB_debug_output. Per that extension,
 356    'type' is one of the enum values classifying the message, and
 357    'id' is the implementation-defined ID of the given message. */
 358 static void
 359 _mesa_glsl_msg(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 360                GLenum type, const char *fmt, va_list ap)
 361 {
 362    bool error = (type == MESA_DEBUG_TYPE_ERROR);
 363    GLuint msg_id = 0;
 364
 365    assert(state->info_log != NULL);
 366
 367    /* Get the offset that the new message will be written to. */
 368    int msg_offset = strlen(state->info_log);
 369
 370    ralloc_asprintf_append(&state->info_log, "%u:%u(%u): %s: ",
 371                                             locp->source,
 372                                             locp->first_line,
 373                                             locp->first_column,
 374                                             error ? "error" : "warning");
 375    ralloc_vasprintf_append(&state->info_log, fmt, ap);
 376
 377    const char *const msg = &state->info_log[msg_offset];
 378    struct gl_context *ctx = state->ctx;
 379
 380    /* Report the error via GL_ARB_debug_output. */
 381    _mesa_shader_debug(ctx, type, &msg_id, msg, strlen(msg));
 382
 383    ralloc_strcat(&state->info_log, "\n");
 384 }
 385
 386 void
 387 _mesa_glsl_error(YYLTYPE *locp, _mesa_glsl_parse_state *state,
 388                  const char *fmt, ...)
 389 {
 390    va_list ap;
 391
 392    state->error = true;
 393
 394    va_start(ap, fmt);
 395    _mesa_glsl_msg(locp, state, MESA_DEBUG_TYPE_ERROR, fmt, ap);
 396    va_end(ap);
 397 }
 398
 399
 400 void
 401 _mesa_glsl_warning(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 402                    const char *fmt, ...)
 403 {
 404    va_list ap;
 405
 406    va_start(ap, fmt);
 407    _mesa_glsl_msg(locp, state, MESA_DEBUG_TYPE_OTHER, fmt, ap);
 408    va_end(ap);
 409 }
 410
 411
 412 /**
 413  * Enum representing the possible behaviors that can be specified in
 414  * an #extension directive.
 415  */
 416 enum ext_behavior {
 417    extension_disable,
 418    extension_enable,
 419    extension_require,
 420    extension_warn
 421 };
 422
 423 /**
 424  * Element type for _mesa_glsl_supported_extensions
 425  */
 426 struct _mesa_glsl_extension {
 427    /**
 428     * Name of the extension when referred to in a GLSL extension
 429     * statement
 430     */
 431    const char *name;
 432
 433    /** True if this extension is available to desktop GL shaders */
 434    bool avail_in_GL;
 435
 436    /** True if this extension is available to GLES shaders */
 437    bool avail_in_ES;
 438
 439    /**
 440     * Flag in the gl_extensions struct indicating whether this
 441     * extension is supported by the driver, or
 442     * &gl_extensions::dummy_true if supported by all drivers.
 443     *
 444     * Note: the type (GLboolean gl_extensions::*) is a "pointer to
 445     * member" type, the type-safe alternative to the "offsetof" macro.
 446     * In a nutshell:
 447     *
 448     * - foo bar::* p declares p to be an "offset" to a field of type
 449     *   foo that exists within struct bar
 450     * - &bar::baz computes the "offset" of field baz within struct bar
 451     * - x.*p accesses the field of x that exists at "offset" p
 452     * - x->*p is equivalent to (*x).*p
 453     */
 454    const GLboolean gl_extensions::* supported_flag;
 455
 456    /**
 457     * Flag in the _mesa_glsl_parse_state struct that should be set
 458     * when this extension is enabled.
 459     *
 460     * See note in _mesa_glsl_extension::supported_flag about "pointer
 461     * to member" types.
 462     */
 463    bool _mesa_glsl_parse_state::* enable_flag;
 464
 465    /**
 466     * Flag in the _mesa_glsl_parse_state struct that should be set
 467     * when the shader requests "warn" behavior for this extension.
 468     *
 469     * See note in _mesa_glsl_extension::supported_flag about "pointer
 470     * to member" types.
 471     */
 472    bool _mesa_glsl_parse_state::* warn_flag;
 473
 474
 475    bool compatible_with_state(const _mesa_glsl_parse_state *state) const;
 476    void set_flags(_mesa_glsl_parse_state *state, ext_behavior behavior) const;
 477 };
 478
 479 #define EXT(NAME, GL, ES, SUPPORTED_FLAG)                   \
 480    { "GL_" #NAME, GL, ES, &gl_extensions::SUPPORTED_FLAG,   \
 481          &_mesa_glsl_parse_state::NAME##_enable,            \
 482          &_mesa_glsl_parse_state::NAME##_warn }
 483
 484 /**
 485  * Table of extensions that can be enabled/disabled within a shader,
 486  * and the conditions under which they are supported.
 487  */
 488 static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
 489    /*                                  API availability */
 490    /* name                             GL     ES         supported flag */
 491    EXT(ARB_arrays_of_arrays,           true,  false,     ARB_arrays_of_arrays),
 492    EXT(ARB_conservative_depth,         true,  false,     ARB_conservative_depth),
 493    EXT(ARB_draw_buffers,               true,  false,     dummy_true),
 494    EXT(ARB_draw_instanced,             true,  false,     ARB_draw_instanced),
 495    EXT(ARB_explicit_attrib_location,   true,  false,     ARB_explicit_attrib_location),
 496    EXT(ARB_fragment_coord_conventions, true,  false,     ARB_fragment_coord_conventions),
 497    EXT(ARB_texture_rectangle,          true,  false,     dummy_true),
 498    EXT(EXT_texture_array,              true,  false,     EXT_texture_array),
 499    EXT(ARB_shader_texture_lod,         true,  false,     ARB_shader_texture_lod),
 500    EXT(ARB_shader_stencil_export,      true,  false,     ARB_shader_stencil_export),
 501    EXT(AMD_conservative_depth,         true,  false,     ARB_conservative_depth),
 502    EXT(AMD_shader_stencil_export,      true,  false,     ARB_shader_stencil_export),
 503    EXT(OES_texture_3D,                 false, true,      EXT_texture3D),
 504    EXT(OES_EGL_image_external,         false, true,      OES_EGL_image_external),
 505    EXT(ARB_shader_bit_encoding,        true,  false,     ARB_shader_bit_encoding),
 506    EXT(ARB_uniform_buffer_object,      true,  false,     ARB_uniform_buffer_object),
 507    EXT(OES_standard_derivatives,       false,  true,     OES_standard_derivatives),
 508    EXT(ARB_texture_cube_map_array,     true,  false,     ARB_texture_cube_map_array),
 509    EXT(ARB_shading_language_packing,   true,  false,     ARB_shading_language_packing),
 510    EXT(ARB_shading_language_420pack,   true,  false,     ARB_shading_language_420pack),
 511    EXT(ARB_texture_multisample,        true,  false,     ARB_texture_multisample),
 512    EXT(ARB_texture_query_levels,       true,  false,     ARB_texture_query_levels),
 513    EXT(ARB_texture_query_lod,          true,  false,     ARB_texture_query_lod),
 514    EXT(ARB_gpu_shader5,                true,  false,     ARB_gpu_shader5),
 515    EXT(AMD_vertex_shader_layer,        true,  false,     AMD_vertex_shader_layer),
 516    EXT(EXT_shader_integer_mix,         true,  true,      EXT_shader_integer_mix),
 517    EXT(ARB_texture_gather,             true,  false,     ARB_texture_gather),
 518    EXT(ARB_shader_atomic_counters,     true,  false,     ARB_shader_atomic_counters),
 519    EXT(ARB_sample_shading,             true,  false,     ARB_sample_shading),
 520    EXT(AMD_shader_trinary_minmax,      true,  false,     dummy_true),
 521    EXT(ARB_viewport_array,             true,  false,     ARB_viewport_array),
 522 };
 523
 524 #undef EXT
 525
 526
 527 /**
 528  * Determine whether a given extension is compatible with the target,
 529  * API, and extension information in the current parser state.
 530  */
 531 bool _mesa_glsl_extension::compatible_with_state(const _mesa_glsl_parse_state *
 532                                                  state) const
 533 {
 534    /* Check that this extension matches whether we are compiling
 535     * for desktop GL or GLES.
 536     */
 537    if (state->es_shader) {
 538       if (!this->avail_in_ES) return false;
 539    } else {
 540       if (!this->avail_in_GL) return false;
 541    }
 542
 543    /* Check that this extension is supported by the OpenGL
 544     * implementation.
 545     *
 546     * Note: the ->* operator indexes into state->extensions by the
 547     * offset this->supported_flag.  See
 548     * _mesa_glsl_extension::supported_flag for more info.
 549     */
 550    return state->extensions->*(this->supported_flag);
 551 }
 552
 553 /**
 554  * Set the appropriate flags in the parser state to establish the
 555  * given behavior for this extension.
 556  */
 557 void _mesa_glsl_extension::set_flags(_mesa_glsl_parse_state *state,
 558                                      ext_behavior behavior) const
 559 {
 560    /* Note: the ->* operator indexes into state by the
 561     * offsets this->enable_flag and this->warn_flag.  See
 562     * _mesa_glsl_extension::supported_flag for more info.
 563     */
 564    state->*(this->enable_flag) = (behavior != extension_disable);
 565    state->*(this->warn_flag)   = (behavior == extension_warn);
 566 }
 567
 568 /**
 569  * Find an extension by name in _mesa_glsl_supported_extensions.  If
 570  * the name is not found, return NULL.
 571  */
 572 static const _mesa_glsl_extension *find_extension(const char *name)
 573 {
 574    for (unsigned i = 0; i < Elements(_mesa_glsl_supported_extensions); ++i) {
 575       if (strcmp(name, _mesa_glsl_supported_extensions[i].name) == 0) {
 576          return &_mesa_glsl_supported_extensions[i];
 577       }
 578    }
 579    return NULL;
 580 }
 581
 582
 583 bool
 584 _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
 585                              const char *behavior_string, YYLTYPE *behavior_locp,
 586                              _mesa_glsl_parse_state *state)
 587 {
 588    ext_behavior behavior;
 589    if (strcmp(behavior_string, "warn") == 0) {
 590       behavior = extension_warn;
 591    } else if (strcmp(behavior_string, "require") == 0) {
 592       behavior = extension_require;
 593    } else if (strcmp(behavior_string, "enable") == 0) {
 594       behavior = extension_enable;
 595    } else if (strcmp(behavior_string, "disable") == 0) {
 596       behavior = extension_disable;
 597    } else {
 598       _mesa_glsl_error(behavior_locp, state,
 599                        "unknown extension behavior `%s'",
 600                        behavior_string);
 601       return false;
 602    }
 603
 604    if (strcmp(name, "all") == 0) {
 605       if ((behavior == extension_enable) || (behavior == extension_require)) {
 606          _mesa_glsl_error(name_locp, state, "cannot %s all extensions",
 607                           (behavior == extension_enable)
 608                           ? "enable" : "require");
 609          return false;
 610       } else {
 611          for (unsigned i = 0;
 612               i < Elements(_mesa_glsl_supported_extensions); ++i) {
 613             const _mesa_glsl_extension *extension
 614                = &_mesa_glsl_supported_extensions[i];
 615             if (extension->compatible_with_state(state)) {
 616                _mesa_glsl_supported_extensions[i].set_flags(state, behavior);
 617             }
 618          }
 619       }
 620    } else {
 621       const _mesa_glsl_extension *extension = find_extension(name);
 622       if (extension && extension->compatible_with_state(state)) {
 623          extension->set_flags(state, behavior);
 624       } else {
 625          static const char *const fmt = "extension `%s' unsupported in %s shader";
 626
 627          if (behavior == extension_require) {
 628             _mesa_glsl_error(name_locp, state, fmt,
 629                              name, _mesa_shader_stage_to_string(state->stage));
 630             return false;
 631          } else {
 632             _mesa_glsl_warning(name_locp, state, fmt,
 633                                name, _mesa_shader_stage_to_string(state->stage));
 634          }
 635       }
 636    }
 637
 638    return true;
 639 }
 640
 641
 642 /**
 643  * Recurses through <type> and <expr> if <expr> is an aggregate initializer
 644  * and sets <expr>'s <constructor_type> field to <type>. Gives later functions
 645  * (process_array_constructor, et al) sufficient information to do type
 646  * checking.
 647  *
 648  * Operates on assignments involving an aggregate initializer. E.g.,
 649  *
 650  * vec4 pos = {1.0, -1.0, 0.0, 1.0};
 651  *
 652  * or more ridiculously,
 653  *
 654  * struct S {
 655  *     vec4 v[2];
 656  * };
 657  *
 658  * struct {
 659  *     S a[2], b;
 660  *     int c;
 661  * } aggregate = {
 662  *     {
 663  *         {
 664  *             {
 665  *                 {1.0, 2.0, 3.0, 4.0}, // a[0].v[0]
 666  *                 {5.0, 6.0, 7.0, 8.0}  // a[0].v[1]
 667  *             } // a[0].v
 668  *         }, // a[0]
 669  *         {
 670  *             {
 671  *                 {1.0, 2.0, 3.0, 4.0}, // a[1].v[0]
 672  *                 {5.0, 6.0, 7.0, 8.0}  // a[1].v[1]
 673  *             } // a[1].v
 674  *         } // a[1]
 675  *     }, // a
 676  *     {
 677  *         {
 678  *             {1.0, 2.0, 3.0, 4.0}, // b.v[0]
 679  *             {5.0, 6.0, 7.0, 8.0}  // b.v[1]
 680  *         } // b.v
 681  *     }, // b
 682  *     4 // c
 683  * };
 684  *
 685  * This pass is necessary because the right-hand side of <type> e = { ... }
 686  * doesn't contain sufficient information to determine if the types match.
 687  */
 688 void
 689 _mesa_ast_set_aggregate_type(const glsl_type *type,
 690                              ast_expression *expr)
 691 {
 692    ast_aggregate_initializer *ai = (ast_aggregate_initializer *)expr;
 693    ai->constructor_type = type;
 694
 695    /* If the aggregate is an array, recursively set its elements' types. */
 696    if (type->is_array()) {
 697       /* Each array element has the type type->element_type().
 698        *
 699        * E.g., if <type> if struct S[2] we want to set each element's type to
 700        * struct S.
 701        */
 702       for (exec_node *expr_node = ai->expressions.head;
 703            !expr_node->is_tail_sentinel();
 704            expr_node = expr_node->next) {
 705          ast_expression *expr = exec_node_data(ast_expression, expr_node,
 706                                                link);
 707
 708          if (expr->oper == ast_aggregate)
 709             _mesa_ast_set_aggregate_type(type->element_type(), expr);
 710       }
 711
 712    /* If the aggregate is a struct, recursively set its fields' types. */
 713    } else if (type->is_record()) {
 714       exec_node *expr_node = ai->expressions.head;
 715
 716       /* Iterate through the struct's fields. */
 717       for (unsigned i = 0; !expr_node->is_tail_sentinel() && i < type->length;
 718            i++, expr_node = expr_node->next) {
 719          ast_expression *expr = exec_node_data(ast_expression, expr_node,
 720                                                link);
 721
 722          if (expr->oper == ast_aggregate) {
 723             _mesa_ast_set_aggregate_type(type->fields.structure[i].type, expr);
 724          }
 725       }
 726    /* If the aggregate is a matrix, set its columns' types. */
 727    } else if (type->is_matrix()) {
 728       for (exec_node *expr_node = ai->expressions.head;
 729            !expr_node->is_tail_sentinel();
 730            expr_node = expr_node->next) {
 731          ast_expression *expr = exec_node_data(ast_expression, expr_node,
 732                                                link);
 733
 734          if (expr->oper == ast_aggregate)
 735             _mesa_ast_set_aggregate_type(type->column_type(), expr);
 736       }
 737    }
 738 }
 739
 740
 741 void
 742 _mesa_ast_type_qualifier_print(const struct ast_type_qualifier *q)
 743 {
 744    if (q->flags.q.constant)
 745       printf("const ");
 746
 747    if (q->flags.q.invariant)
 748       printf("invariant ");
 749
 750    if (q->flags.q.attribute)
 751       printf("attribute ");
 752
 753    if (q->flags.q.varying)
 754       printf("varying ");
 755
 756    if (q->flags.q.in && q->flags.q.out)
 757       printf("inout ");
 758    else {
 759       if (q->flags.q.in)
 760          printf("in ");
 761
 762       if (q->flags.q.out)
 763          printf("out ");
 764    }
 765
 766    if (q->flags.q.centroid)
 767       printf("centroid ");
 768    if (q->flags.q.sample)
 769       printf("sample ");
 770    if (q->flags.q.uniform)
 771       printf("uniform ");
 772    if (q->flags.q.smooth)
 773       printf("smooth ");
 774    if (q->flags.q.flat)
 775       printf("flat ");
 776    if (q->flags.q.noperspective)
 777       printf("noperspective ");
 778 }
 779
 780
 781 void
 782 ast_node::print(void) const
 783 {
 784    printf("unhandled node ");
 785 }
 786
 787
 788 ast_node::ast_node(void)
 789 {
 790    this->location.source = 0;
 791    this->location.line = 0;
 792    this->location.column = 0;
 793 }
 794
 795
 796 static void
 797 ast_opt_array_dimensions_print(const ast_array_specifier *array_specifier)
 798 {
 799    if (array_specifier)
 800       array_specifier->print();
 801 }
 802
 803
 804 void
 805 ast_compound_statement::print(void) const
 806 {
 807    printf("{\n");
 808
 809    foreach_list_const(n, &this->statements) {
 810       ast_node *ast = exec_node_data(ast_node, n, link);
 811       ast->print();
 812    }
 813
 814    printf("}\n");
 815 }
 816
 817
 818 ast_compound_statement::ast_compound_statement(int new_scope,
 819                                                ast_node *statements)
 820 {
 821    this->new_scope = new_scope;
 822
 823    if (statements != NULL) {
 824       this->statements.push_degenerate_list_at_head(&statements->link);
 825    }
 826 }
 827
 828
 829 void
 830 ast_expression::print(void) const
 831 {
 832    switch (oper) {
 833    case ast_assign:
 834    case ast_mul_assign:
 835    case ast_div_assign:
 836    case ast_mod_assign:
 837    case ast_add_assign:
 838    case ast_sub_assign:
 839    case ast_ls_assign:
 840    case ast_rs_assign:
 841    case ast_and_assign:
 842    case ast_xor_assign:
 843    case ast_or_assign:
 844       subexpressions[0]->print();
 845       printf("%s ", operator_string(oper));
 846       subexpressions[1]->print();
 847       break;
 848
 849    case ast_field_selection:
 850       subexpressions[0]->print();
 851       printf(". %s ", primary_expression.identifier);
 852       break;
 853
 854    case ast_plus:
 855    case ast_neg:
 856    case ast_bit_not:
 857    case ast_logic_not:
 858    case ast_pre_inc:
 859    case ast_pre_dec:
 860       printf("%s ", operator_string(oper));
 861       subexpressions[0]->print();
 862       break;
 863
 864    case ast_post_inc:
 865    case ast_post_dec:
 866       subexpressions[0]->print();
 867       printf("%s ", operator_string(oper));
 868       break;
 869
 870    case ast_conditional:
 871       subexpressions[0]->print();
 872       printf("? ");
 873       subexpressions[1]->print();
 874       printf(": ");
 875       subexpressions[2]->print();
 876       break;
 877
 878    case ast_array_index:
 879       subexpressions[0]->print();
 880       printf("[ ");
 881       subexpressions[1]->print();
 882       printf("] ");
 883       break;
 884
 885    case ast_function_call: {
 886       subexpressions[0]->print();
 887       printf("( ");
 888
 889       foreach_list_const (n, &this->expressions) {
 890          if (n != this->expressions.get_head())
 891             printf(", ");
 892
 893          ast_node *ast = exec_node_data(ast_node, n, link);
 894          ast->print();
 895       }
 896
 897       printf(") ");
 898       break;
 899    }
 900
 901    case ast_identifier:
 902       printf("%s ", primary_expression.identifier);
 903       break;
 904
 905    case ast_int_constant:
 906       printf("%d ", primary_expression.int_constant);
 907       break;
 908
 909    case ast_uint_constant:
 910       printf("%u ", primary_expression.uint_constant);
 911       break;
 912
 913    case ast_float_constant:
 914       printf("%f ", primary_expression.float_constant);
 915       break;
 916
 917    case ast_bool_constant:
 918       printf("%s ",
 919              primary_expression.bool_constant
 920              ? "true" : "false");
 921       break;
 922
 923    case ast_sequence: {
 924       printf("( ");
 925       foreach_list_const(n, & this->expressions) {
 926          if (n != this->expressions.get_head())
 927             printf(", ");
 928
 929          ast_node *ast = exec_node_data(ast_node, n, link);
 930          ast->print();
 931       }
 932       printf(") ");
 933       break;
 934    }
 935
 936    case ast_aggregate: {
 937       printf("{ ");
 938       foreach_list_const(n, & this->expressions) {
 939          if (n != this->expressions.get_head())
 940             printf(", ");
 941
 942          ast_node *ast = exec_node_data(ast_node, n, link);
 943          ast->print();
 944       }
 945       printf("} ");
 946       break;
 947    }
 948
 949    default:
 950       assert(0);
 951       break;
 952    }
 953 }
 954
 955 ast_expression::ast_expression(int oper,
 956                                ast_expression *ex0,
 957                                ast_expression *ex1,
 958                                ast_expression *ex2) :
 959    primary_expression()
 960 {
 961    this->oper = ast_operators(oper);
 962    this->subexpressions[0] = ex0;
 963    this->subexpressions[1] = ex1;
 964    this->subexpressions[2] = ex2;
 965    this->non_lvalue_description = NULL;
 966 }
 967
 968
 969 void
 970 ast_expression_statement::print(void) const
 971 {
 972    if (expression)
 973       expression->print();
 974
 975    printf("; ");
 976 }
 977
 978
 979 ast_expression_statement::ast_expression_statement(ast_expression *ex) :
 980    expression(ex)
 981 {
 982    /* empty */
 983 }
 984
 985
 986 void
 987 ast_function::print(void) const
 988 {
 989    return_type->print();
 990    printf(" %s (", identifier);
 991
 992    foreach_list_const(n, & this->parameters) {
 993       ast_node *ast = exec_node_data(ast_node, n, link);
 994       ast->print();
 995    }
 996
 997    printf(")");
 998 }
 999
1000
1001 ast_function::ast_function(void)
1002    : return_type(NULL), identifier(NULL), is_definition(false),
1003      signature(NULL)
1004 {
1005    /* empty */
1006 }
1007
1008
1009 void
1010 ast_fully_specified_type::print(void) const
1011 {
1012    _mesa_ast_type_qualifier_print(& qualifier);
1013    specifier->print();
1014 }
1015
1016
1017 void
1018 ast_parameter_declarator::print(void) const
1019 {
1020    type->print();
1021    if (identifier)
1022       printf("%s ", identifier);
1023    ast_opt_array_dimensions_print(array_specifier);
1024 }
1025
1026
1027 void
1028 ast_function_definition::print(void) const
1029 {
1030    prototype->print();
1031    body->print();
1032 }
1033
1034
1035 void
1036 ast_declaration::print(void) const
1037 {
1038    printf("%s ", identifier);
1039    ast_opt_array_dimensions_print(array_specifier);
1040
1041    if (initializer) {
1042       printf("= ");
1043       initializer->print();
1044    }
1045 }
1046
1047
1048 ast_declaration::ast_declaration(const char *identifier,
1049                                  ast_array_specifier *array_specifier,
1050                                  ast_expression *initializer)
1051 {
1052    this->identifier = identifier;
1053    this->array_specifier = array_specifier;
1054    this->initializer = initializer;
1055 }
1056
1057
1058 void
1059 ast_declarator_list::print(void) const
1060 {
1061    assert(type || invariant);
1062
1063    if (type)
1064       type->print();
1065    else
1066       printf("invariant ");
1067
1068    foreach_list_const (ptr, & this->declarations) {
1069       if (ptr != this->declarations.get_head())
1070          printf(", ");
1071
1072       ast_node *ast = exec_node_data(ast_node, ptr, link);
1073       ast->print();
1074    }
1075
1076    printf("; ");
1077 }
1078
1079
1080 ast_declarator_list::ast_declarator_list(ast_fully_specified_type *type)
1081 {
1082    this->type = type;
1083    this->invariant = false;
1084 }
1085
1086 void
1087 ast_jump_statement::print(void) const
1088 {
1089    switch (mode) {
1090    case ast_continue:
1091       printf("continue; ");
1092       break;
1093    case ast_break:
1094       printf("break; ");
1095       break;
1096    case ast_return:
1097       printf("return ");
1098       if (opt_return_value)
1099          opt_return_value->print();
1100
1101       printf("; ");
1102       break;
1103    case ast_discard:
1104       printf("discard; ");
1105       break;
1106    }
1107 }
1108
1109
1110 ast_jump_statement::ast_jump_statement(int mode, ast_expression *return_value)
1111    : opt_return_value(NULL)
1112 {
1113    this->mode = ast_jump_modes(mode);
1114
1115    if (mode == ast_return)
1116       opt_return_value = return_value;
1117 }
1118
1119
1120 void
1121 ast_selection_statement::print(void) const
1122 {
1123    printf("if ( ");
1124    condition->print();
1125    printf(") ");
1126
1127    then_statement->print();
1128
1129    if (else_statement) {
1130       printf("else ");
1131       else_statement->print();
1132    }
1133
1134 }
1135
1136
1137 ast_selection_statement::ast_selection_statement(ast_expression *condition,
1138                                                  ast_node *then_statement,
1139                                                  ast_node *else_statement)
1140 {
1141    this->condition = condition;
1142    this->then_statement = then_statement;
1143    this->else_statement = else_statement;
1144 }
1145
1146
1147 void
1148 ast_switch_statement::print(void) const
1149 {
1150    printf("switch ( ");
1151    test_expression->print();
1152    printf(") ");
1153
1154    body->print();
1155 }
1156
1157
1158 ast_switch_statement::ast_switch_statement(ast_expression *test_expression,
1159                                            ast_node *body)
1160 {
1161    this->test_expression = test_expression;
1162    this->body = body;
1163 }
1164
1165
1166 void
1167 ast_switch_body::print(void) const
1168 {
1169    printf("{\n");
1170    if (stmts != NULL) {
1171       stmts->print();
1172    }
1173    printf("}\n");
1174 }
1175
1176
1177 ast_switch_body::ast_switch_body(ast_case_statement_list *stmts)
1178 {
1179    this->stmts = stmts;
1180 }
1181
1182
1183 void ast_case_label::print(void) const
1184 {
1185    if (test_value != NULL) {
1186       printf("case ");
1187       test_value->print();
1188       printf(": ");
1189    } else {
1190       printf("default: ");
1191    }
1192 }
1193
1194
1195 ast_case_label::ast_case_label(ast_expression *test_value)
1196 {
1197    this->test_value = test_value;
1198 }
1199
1200
1201 void ast_case_label_list::print(void) const
1202 {
1203    foreach_list_const(n, & this->labels) {
1204       ast_node *ast = exec_node_data(ast_node, n, link);
1205       ast->print();
1206    }
1207    printf("\n");
1208 }
1209
1210
1211 ast_case_label_list::ast_case_label_list(void)
1212 {
1213 }
1214
1215
1216 void ast_case_statement::print(void) const
1217 {
1218    labels->print();
1219    foreach_list_const(n, & this->stmts) {
1220       ast_node *ast = exec_node_data(ast_node, n, link);
1221       ast->print();
1222       printf("\n");
1223    }
1224 }
1225
1226
1227 ast_case_statement::ast_case_statement(ast_case_label_list *labels)
1228 {
1229    this->labels = labels;
1230 }
1231
1232
1233 void ast_case_statement_list::print(void) const
1234 {
1235    foreach_list_const(n, & this->cases) {
1236       ast_node *ast = exec_node_data(ast_node, n, link);
1237       ast->print();
1238    }
1239 }
1240
1241
1242 ast_case_statement_list::ast_case_statement_list(void)
1243 {
1244 }
1245
1246
1247 void
1248 ast_iteration_statement::print(void) const
1249 {
1250    switch (mode) {
1251    case ast_for:
1252       printf("for( ");
1253       if (init_statement)
1254          init_statement->print();
1255       printf("; ");
1256
1257       if (condition)
1258          condition->print();
1259       printf("; ");
1260
1261       if (rest_expression)
1262          rest_expression->print();
1263       printf(") ");
1264
1265       body->print();
1266       break;
1267
1268    case ast_while:
1269       printf("while ( ");
1270       if (condition)
1271          condition->print();
1272       printf(") ");
1273       body->print();
1274       break;
1275
1276    case ast_do_while:
1277       printf("do ");
1278       body->print();
1279       printf("while ( ");
1280       if (condition)
1281          condition->print();
1282       printf("); ");
1283       break;
1284    }
1285 }
1286
1287
1288 ast_iteration_statement::ast_iteration_statement(int mode,
1289                                                  ast_node *init,
1290                                                  ast_node *condition,
1291                                                  ast_expression *rest_expression,
1292                                                  ast_node *body)
1293 {
1294    this->mode = ast_iteration_modes(mode);
1295    this->init_statement = init;
1296    this->condition = condition;
1297    this->rest_expression = rest_expression;
1298    this->body = body;
1299 }
1300
1301
1302 void
1303 ast_struct_specifier::print(void) const
1304 {
1305    printf("struct %s { ", name);
1306    foreach_list_const(n, &this->declarations) {
1307       ast_node *ast = exec_node_data(ast_node, n, link);
1308       ast->print();
1309    }
1310    printf("} ");
1311 }
1312
1313
1314 ast_struct_specifier::ast_struct_specifier(const char *identifier,
1315                                            ast_declarator_list *declarator_list)
1316 {
1317    if (identifier == NULL) {
1318       static unsigned anon_count = 1;
1319       identifier = ralloc_asprintf(this, "#anon_struct_%04x", anon_count);
1320       anon_count++;
1321    }
1322    name = identifier;
1323    this->declarations.push_degenerate_list_at_head(&declarator_list->link);
1324    is_declaration = true;
1325 }
1326
1327 static void
1328 set_shader_inout_layout(struct gl_shader *shader,
1329                      struct _mesa_glsl_parse_state *state)
1330 {
1331    if (shader->Stage != MESA_SHADER_GEOMETRY) {
1332       /* Should have been prevented by the parser. */
1333       assert(!state->gs_input_prim_type_specified);
1334       assert(!state->out_qualifier->flags.i);
1335       return;
1336    }
1337
1338    shader->Geom.VerticesOut = 0;
1339    if (state->out_qualifier->flags.q.max_vertices)
1340       shader->Geom.VerticesOut = state->out_qualifier->max_vertices;
1341
1342    if (state->gs_input_prim_type_specified) {
1343       shader->Geom.InputType = state->gs_input_prim_type;
1344    } else {
1345       shader->Geom.InputType = PRIM_UNKNOWN;
1346    }
1347
1348    if (state->out_qualifier->flags.q.prim_type) {
1349       shader->Geom.OutputType = state->out_qualifier->prim_type;
1350    } else {
1351       shader->Geom.OutputType = PRIM_UNKNOWN;
1352    }
1353 }
1354
1355 extern "C" {
1356
1357 void
1358 _mesa_glsl_compile_shader(struct gl_context *ctx, struct gl_shader *shader,
1359                           bool dump_ast, bool dump_hir)
1360 {
1361    struct _mesa_glsl_parse_state *state =
1362       new(shader) _mesa_glsl_parse_state(ctx, shader->Stage, shader);
1363    const char *source = shader->Source;
1364
1365    state->error = glcpp_preprocess(state, &source, &state->info_log,
1366                              &ctx->Extensions, ctx);
1367
1368    if (!state->error) {
1369      _mesa_glsl_lexer_ctor(state, source);
1370      _mesa_glsl_parse(state);
1371      _mesa_glsl_lexer_dtor(state);
1372    }
1373
1374    if (dump_ast) {
1375       foreach_list_const(n, &state->translation_unit) {
1376          ast_node *ast = exec_node_data(ast_node, n, link);
1377          ast->print();
1378       }
1379       printf("\n\n");
1380    }
1381
1382    ralloc_free(shader->ir);
1383    shader->ir = new(shader) exec_list;
1384    if (!state->error && !state->translation_unit.is_empty())
1385       _mesa_ast_to_hir(shader->ir, state);
1386
1387    if (!state->error) {
1388       validate_ir_tree(shader->ir);
1389
1390       /* Print out the unoptimized IR. */
1391       if (dump_hir) {
1392          _mesa_print_ir(shader->ir, state);
1393       }
1394    }
1395
1396
1397    if (!state->error && !shader->ir->is_empty()) {
1398       struct gl_shader_compiler_options *options =
1399          &ctx->ShaderCompilerOptions[shader->Stage];
1400
1401       /* Do some optimization at compile time to reduce shader IR size
1402        * and reduce later work if the same shader is linked multiple times
1403        */
1404       while (do_common_optimization(shader->ir, false, false, 32, options))
1405          ;
1406
1407       validate_ir_tree(shader->ir);
1408    }
1409
1410    if (shader->InfoLog)
1411       ralloc_free(shader->InfoLog);
1412
1413    shader->symbols = state->symbols;
1414    shader->CompileStatus = !state->error;
1415    shader->InfoLog = state->info_log;
1416    shader->Version = state->language_version;
1417    shader->IsES = state->es_shader;
1418    shader->uses_builtin_functions = state->uses_builtin_functions;
1419
1420    if (shader->UniformBlocks)
1421       ralloc_free(shader->UniformBlocks);
1422    shader->NumUniformBlocks = state->num_uniform_blocks;
1423    shader->UniformBlocks = state->uniform_blocks;
1424    ralloc_steal(shader, shader->UniformBlocks);
1425
1426    if (!state->error)
1427       set_shader_inout_layout(shader, state);
1428
1429    /* Retain any live IR, but trash the rest. */
1430    reparent_ir(shader->ir, shader->ir);
1431
1432    ralloc_free(state);
1433 }
1434
1435 } /* extern "C" */
1436 /**
1437  * Do the set of common optimizations passes
1438  *
1439  * \param ir                          List of instructions to be optimized
1440  * \param linked                      Is the shader linked?  This enables
1441  *                                    optimizations passes that remove code at
1442  *                                    global scope and could cause linking to
1443  *                                    fail.
1444  * \param uniform_locations_assigned  Have locations already been assigned for
1445  *                                    uniforms?  This prevents the declarations
1446  *                                    of unused uniforms from being removed.
1447  *                                    The setting of this flag only matters if
1448  *                                    \c linked is \c true.
1449  * \param max_unroll_iterations       Maximum number of loop iterations to be
1450  *                                    unrolled.  Setting to 0 disables loop
1451  *                                    unrolling.
1452  * \param options                     The driver's preferred shader options.
1453  */
1454 bool
1455 do_common_optimization(exec_list *ir, bool linked,
1456                        bool uniform_locations_assigned,
1457                        unsigned max_unroll_iterations,
1458                        const struct gl_shader_compiler_options *options)
1459 {
1460    GLboolean progress = GL_FALSE;
1461
1462    progress = lower_instructions(ir, SUB_TO_ADD_NEG) || progress;
1463
1464    if (linked) {
1465       progress = do_function_inlining(ir) || progress;
1466       progress = do_dead_functions(ir) || progress;
1467       progress = do_structure_splitting(ir) || progress;
1468    }
1469    progress = do_if_simplification(ir) || progress;
1470    progress = opt_flatten_nested_if_blocks(ir) || progress;
1471    progress = do_copy_propagation(ir) || progress;
1472    progress = do_copy_propagation_elements(ir) || progress;
1473
1474    if (options->OptimizeForAOS && !linked)
1475       progress = opt_flip_matrices(ir) || progress;
1476
1477    if (linked && options->OptimizeForAOS) {
1478       progress = do_vectorize(ir) || progress;
1479    }
1480
1481    if (linked)
1482       progress = do_dead_code(ir, uniform_locations_assigned) || progress;
1483    else
1484       progress = do_dead_code_unlinked(ir) || progress;
1485    progress = do_dead_code_local(ir) || progress;
1486    progress = do_tree_grafting(ir) || progress;
1487    progress = do_constant_propagation(ir) || progress;
1488    if (linked)
1489       progress = do_constant_variable(ir) || progress;
1490    else
1491       progress = do_constant_variable_unlinked(ir) || progress;
1492    progress = do_constant_folding(ir) || progress;
1493    progress = do_cse(ir) || progress;
1494    progress = do_algebraic(ir) || progress;
1495    progress = do_lower_jumps(ir) || progress;
1496    progress = do_vec_index_to_swizzle(ir) || progress;
1497    progress = lower_vector_insert(ir, false) || progress;
1498    progress = do_swizzle_swizzle(ir) || progress;
1499    progress = do_noop_swizzle(ir) || progress;
1500
1501    progress = optimize_split_arrays(ir, linked) || progress;
1502    progress = optimize_redundant_jumps(ir) || progress;
1503
1504    loop_state *ls = analyze_loop_variables(ir);
1505    if (ls->loop_found) {
1506       progress = set_loop_controls(ir, ls) || progress;
1507       progress = unroll_loops(ir, ls, max_unroll_iterations) || progress;
1508    }
1509    delete ls;
1510
1511    return progress;
1512 }
1513
1514 extern "C" {
1515
1516 /**
1517  * To be called at GL teardown time, this frees compiler datastructures.
1518  *
1519  * After calling this, any previously compiled shaders and shader
1520  * programs would be invalid.  So this should happen at approximately
1521  * program exit.
1522  */
1523 void
1524 _mesa_destroy_shader_compiler(void)
1525 {
1526    _mesa_destroy_shader_compiler_caches();
1527
1528    _mesa_glsl_release_types();
1529 }
1530
1531 /**
1532  * Releases compiler caches to trade off performance for memory.
1533  *
1534  * Intended to be used with glReleaseShaderCompiler().
1535  */
1536 void
1537 _mesa_destroy_shader_compiler_caches(void)
1538 {
1539    _mesa_glsl_release_builtin_functions();
1540 }
1541
1542 }