src/compiler/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 #include "main/core.h" /* for struct gl_context */
  29 #include "main/context.h"
  30 #include "main/debug_output.h"
  31 #include "main/formats.h"
  32 #include "main/shaderobj.h"
  33 #include "util/u_atomic.h" /* for p_atomic_cmpxchg */
  34 #include "util/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 #include "builtin_functions.h"
  41
  42 /**
  43  * Format a short human-readable description of the given GLSL version.
  44  */
  45 const char *
  46 glsl_compute_version_string(void *mem_ctx, bool is_es, unsigned version)
  47 {
  48    return ralloc_asprintf(mem_ctx, "GLSL%s %d.%02d", is_es ? " ES" : "",
  49                           version / 100, version % 100);
  50 }
  51
  52
  53 static const unsigned known_desktop_glsl_versions[] =
  54    { 110, 120, 130, 140, 150, 330, 400, 410, 420, 430, 440, 450 };
  55 static const unsigned known_desktop_gl_versions[] =
  56    {  20,  21,  30,  31,  32,  33,  40,  41,  42,  43,  44,  45 };
  57
  58
  59 _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
  60                                                gl_shader_stage stage,
  61                                                void *mem_ctx)
  62    : ctx(_ctx), cs_input_local_size_specified(false), cs_input_local_size(),
  63      switch_state()
  64 {
  65    assert(stage < MESA_SHADER_STAGES);
  66    this->stage = stage;
  67
  68    this->scanner = NULL;
  69    this->translation_unit.make_empty();
  70    this->symbols = new(mem_ctx) glsl_symbol_table;
  71
  72    this->linalloc = linear_alloc_parent(this, 0);
  73
  74    this->info_log = ralloc_strdup(mem_ctx, "");
  75    this->error = false;
  76    this->loop_nesting_ast = NULL;
  77
  78    this->uses_builtin_functions = false;
  79
  80    /* Set default language version and extensions */
  81    this->language_version = 110;
  82    this->forced_language_version = ctx->Const.ForceGLSLVersion;
  83    this->zero_init = ctx->Const.GLSLZeroInit;
  84    this->gl_version = 20;
  85    this->es_shader = false;
  86    this->ARB_texture_rectangle_enable = true;
  87
  88    /* OpenGL ES 2.0 has different defaults from desktop GL. */
  89    if (ctx->API == API_OPENGLES2) {
  90       this->language_version = 100;
  91       this->es_shader = true;
  92       this->ARB_texture_rectangle_enable = false;
  93    }
  94
  95    this->extensions = &ctx->Extensions;
  96
  97    this->Const.MaxLights = ctx->Const.MaxLights;
  98    this->Const.MaxClipPlanes = ctx->Const.MaxClipPlanes;
  99    this->Const.MaxTextureUnits = ctx->Const.MaxTextureUnits;
 100    this->Const.MaxTextureCoords = ctx->Const.MaxTextureCoordUnits;
 101    this->Const.MaxVertexAttribs = ctx->Const.Program[MESA_SHADER_VERTEX].MaxAttribs;
 102    this->Const.MaxVertexUniformComponents = ctx->Const.Program[MESA_SHADER_VERTEX].MaxUniformComponents;
 103    this->Const.MaxVertexTextureImageUnits = ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits;
 104    this->Const.MaxCombinedTextureImageUnits = ctx->Const.MaxCombinedTextureImageUnits;
 105    this->Const.MaxTextureImageUnits = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits;
 106    this->Const.MaxFragmentUniformComponents = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxUniformComponents;
 107    this->Const.MinProgramTexelOffset = ctx->Const.MinProgramTexelOffset;
 108    this->Const.MaxProgramTexelOffset = ctx->Const.MaxProgramTexelOffset;
 109
 110    this->Const.MaxDrawBuffers = ctx->Const.MaxDrawBuffers;
 111
 112    this->Const.MaxDualSourceDrawBuffers = ctx->Const.MaxDualSourceDrawBuffers;
 113
 114    /* 1.50 constants */
 115    this->Const.MaxVertexOutputComponents = ctx->Const.Program[MESA_SHADER_VERTEX].MaxOutputComponents;
 116    this->Const.MaxGeometryInputComponents = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxInputComponents;
 117    this->Const.MaxGeometryOutputComponents = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxOutputComponents;
 118    this->Const.MaxFragmentInputComponents = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxInputComponents;
 119    this->Const.MaxGeometryTextureImageUnits = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits;
 120    this->Const.MaxGeometryOutputVertices = ctx->Const.MaxGeometryOutputVertices;
 121    this->Const.MaxGeometryTotalOutputComponents = ctx->Const.MaxGeometryTotalOutputComponents;
 122    this->Const.MaxGeometryUniformComponents = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxUniformComponents;
 123
 124    this->Const.MaxVertexAtomicCounters = ctx->Const.Program[MESA_SHADER_VERTEX].MaxAtomicCounters;
 125    this->Const.MaxTessControlAtomicCounters = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxAtomicCounters;
 126    this->Const.MaxTessEvaluationAtomicCounters = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxAtomicCounters;
 127    this->Const.MaxGeometryAtomicCounters = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxAtomicCounters;
 128    this->Const.MaxFragmentAtomicCounters = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxAtomicCounters;
 129    this->Const.MaxComputeAtomicCounters = ctx->Const.Program[MESA_SHADER_COMPUTE].MaxAtomicCounters;
 130    this->Const.MaxCombinedAtomicCounters = ctx->Const.MaxCombinedAtomicCounters;
 131    this->Const.MaxAtomicBufferBindings = ctx->Const.MaxAtomicBufferBindings;
 132    this->Const.MaxVertexAtomicCounterBuffers =
 133       ctx->Const.Program[MESA_SHADER_VERTEX].MaxAtomicBuffers;
 134    this->Const.MaxTessControlAtomicCounterBuffers =
 135       ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxAtomicBuffers;
 136    this->Const.MaxTessEvaluationAtomicCounterBuffers =
 137       ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxAtomicBuffers;
 138    this->Const.MaxGeometryAtomicCounterBuffers =
 139       ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxAtomicBuffers;
 140    this->Const.MaxFragmentAtomicCounterBuffers =
 141       ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxAtomicBuffers;
 142    this->Const.MaxComputeAtomicCounterBuffers =
 143       ctx->Const.Program[MESA_SHADER_COMPUTE].MaxAtomicBuffers;
 144    this->Const.MaxCombinedAtomicCounterBuffers =
 145       ctx->Const.MaxCombinedAtomicBuffers;
 146    this->Const.MaxAtomicCounterBufferSize =
 147       ctx->Const.MaxAtomicBufferSize;
 148
 149    /* ARB_enhanced_layouts constants */
 150    this->Const.MaxTransformFeedbackBuffers = ctx->Const.MaxTransformFeedbackBuffers;
 151    this->Const.MaxTransformFeedbackInterleavedComponents = ctx->Const.MaxTransformFeedbackInterleavedComponents;
 152
 153    /* Compute shader constants */
 154    for (unsigned i = 0; i < ARRAY_SIZE(this->Const.MaxComputeWorkGroupCount); i++)
 155       this->Const.MaxComputeWorkGroupCount[i] = ctx->Const.MaxComputeWorkGroupCount[i];
 156    for (unsigned i = 0; i < ARRAY_SIZE(this->Const.MaxComputeWorkGroupSize); i++)
 157       this->Const.MaxComputeWorkGroupSize[i] = ctx->Const.MaxComputeWorkGroupSize[i];
 158
 159    this->Const.MaxComputeTextureImageUnits = ctx->Const.Program[MESA_SHADER_COMPUTE].MaxTextureImageUnits;
 160    this->Const.MaxComputeUniformComponents = ctx->Const.Program[MESA_SHADER_COMPUTE].MaxUniformComponents;
 161
 162    this->Const.MaxImageUnits = ctx->Const.MaxImageUnits;
 163    this->Const.MaxCombinedShaderOutputResources = ctx->Const.MaxCombinedShaderOutputResources;
 164    this->Const.MaxImageSamples = ctx->Const.MaxImageSamples;
 165    this->Const.MaxVertexImageUniforms = ctx->Const.Program[MESA_SHADER_VERTEX].MaxImageUniforms;
 166    this->Const.MaxTessControlImageUniforms = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxImageUniforms;
 167    this->Const.MaxTessEvaluationImageUniforms = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxImageUniforms;
 168    this->Const.MaxGeometryImageUniforms = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxImageUniforms;
 169    this->Const.MaxFragmentImageUniforms = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxImageUniforms;
 170    this->Const.MaxComputeImageUniforms = ctx->Const.Program[MESA_SHADER_COMPUTE].MaxImageUniforms;
 171    this->Const.MaxCombinedImageUniforms = ctx->Const.MaxCombinedImageUniforms;
 172
 173    /* ARB_viewport_array */
 174    this->Const.MaxViewports = ctx->Const.MaxViewports;
 175
 176    /* tessellation shader constants */
 177    this->Const.MaxPatchVertices = ctx->Const.MaxPatchVertices;
 178    this->Const.MaxTessGenLevel = ctx->Const.MaxTessGenLevel;
 179    this->Const.MaxTessControlInputComponents = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxInputComponents;
 180    this->Const.MaxTessControlOutputComponents = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxOutputComponents;
 181    this->Const.MaxTessControlTextureImageUnits = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxTextureImageUnits;
 182    this->Const.MaxTessEvaluationInputComponents = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxInputComponents;
 183    this->Const.MaxTessEvaluationOutputComponents = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxOutputComponents;
 184    this->Const.MaxTessEvaluationTextureImageUnits = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxTextureImageUnits;
 185    this->Const.MaxTessPatchComponents = ctx->Const.MaxTessPatchComponents;
 186    this->Const.MaxTessControlTotalOutputComponents = ctx->Const.MaxTessControlTotalOutputComponents;
 187    this->Const.MaxTessControlUniformComponents = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxUniformComponents;
 188    this->Const.MaxTessEvaluationUniformComponents = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxUniformComponents;
 189
 190    /* GL 4.5 / OES_sample_variables */
 191    this->Const.MaxSamples = ctx->Const.MaxSamples;
 192
 193    this->current_function = NULL;
 194    this->toplevel_ir = NULL;
 195    this->found_return = false;
 196    this->all_invariant = false;
 197    this->user_structures = NULL;
 198    this->num_user_structures = 0;
 199    this->num_subroutines = 0;
 200    this->subroutines = NULL;
 201    this->num_subroutine_types = 0;
 202    this->subroutine_types = NULL;
 203
 204    /* supported_versions should be large enough to support the known desktop
 205     * GLSL versions plus 4 GLES versions (ES 1.00, ES 3.00, ES 3.10, ES 3.20)
 206     */
 207    STATIC_ASSERT((ARRAY_SIZE(known_desktop_glsl_versions) + 4) ==
 208                  ARRAY_SIZE(this->supported_versions));
 209
 210    /* Populate the list of supported GLSL versions */
 211    /* FINISHME: Once the OpenGL 3.0 'forward compatible' context or
 212     * the OpenGL 3.2 Core context is supported, this logic will need
 213     * change.  Older versions of GLSL are no longer supported
 214     * outside the compatibility contexts of 3.x.
 215     */
 216    this->num_supported_versions = 0;
 217    if (_mesa_is_desktop_gl(ctx)) {
 218       for (unsigned i = 0; i < ARRAY_SIZE(known_desktop_glsl_versions); i++) {
 219          if (known_desktop_glsl_versions[i] <= ctx->Const.GLSLVersion) {
 220             this->supported_versions[this->num_supported_versions].ver
 221                = known_desktop_glsl_versions[i];
 222             this->supported_versions[this->num_supported_versions].gl_ver
 223                = known_desktop_gl_versions[i];
 224             this->supported_versions[this->num_supported_versions].es = false;
 225             this->num_supported_versions++;
 226          }
 227       }
 228    }
 229    if (ctx->API == API_OPENGLES2 || ctx->Extensions.ARB_ES2_compatibility) {
 230       this->supported_versions[this->num_supported_versions].ver = 100;
 231       this->supported_versions[this->num_supported_versions].gl_ver = 20;
 232       this->supported_versions[this->num_supported_versions].es = true;
 233       this->num_supported_versions++;
 234    }
 235    if (_mesa_is_gles3(ctx) || ctx->Extensions.ARB_ES3_compatibility) {
 236       this->supported_versions[this->num_supported_versions].ver = 300;
 237       this->supported_versions[this->num_supported_versions].gl_ver = 30;
 238       this->supported_versions[this->num_supported_versions].es = true;
 239       this->num_supported_versions++;
 240    }
 241    if (_mesa_is_gles31(ctx) || ctx->Extensions.ARB_ES3_1_compatibility) {
 242       this->supported_versions[this->num_supported_versions].ver = 310;
 243       this->supported_versions[this->num_supported_versions].gl_ver = 31;
 244       this->supported_versions[this->num_supported_versions].es = true;
 245       this->num_supported_versions++;
 246    }
 247    if ((ctx->API == API_OPENGLES2 && ctx->Version >= 32) ||
 248        ctx->Extensions.ARB_ES3_2_compatibility) {
 249       this->supported_versions[this->num_supported_versions].ver = 320;
 250       this->supported_versions[this->num_supported_versions].gl_ver = 32;
 251       this->supported_versions[this->num_supported_versions].es = true;
 252       this->num_supported_versions++;
 253    }
 254
 255    /* Create a string for use in error messages to tell the user which GLSL
 256     * versions are supported.
 257     */
 258    char *supported = ralloc_strdup(this, "");
 259    for (unsigned i = 0; i < this->num_supported_versions; i++) {
 260       unsigned ver = this->supported_versions[i].ver;
 261       const char *const prefix = (i == 0)
 262          ? ""
 263          : ((i == this->num_supported_versions - 1) ? ", and " : ", ");
 264       const char *const suffix = (this->supported_versions[i].es) ? " ES" : "";
 265
 266       ralloc_asprintf_append(& supported, "%s%u.%02u%s",
 267                              prefix,
 268                              ver / 100, ver % 100,
 269                              suffix);
 270    }
 271
 272    this->supported_version_string = supported;
 273
 274    if (ctx->Const.ForceGLSLExtensionsWarn)
 275       _mesa_glsl_process_extension("all", NULL, "warn", NULL, this);
 276
 277    this->default_uniform_qualifier = new(this) ast_type_qualifier();
 278    this->default_uniform_qualifier->flags.q.shared = 1;
 279    this->default_uniform_qualifier->flags.q.column_major = 1;
 280
 281    this->default_shader_storage_qualifier = new(this) ast_type_qualifier();
 282    this->default_shader_storage_qualifier->flags.q.shared = 1;
 283    this->default_shader_storage_qualifier->flags.q.column_major = 1;
 284
 285    this->fs_uses_gl_fragcoord = false;
 286    this->fs_redeclares_gl_fragcoord = false;
 287    this->fs_origin_upper_left = false;
 288    this->fs_pixel_center_integer = false;
 289    this->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers = false;
 290
 291    this->gs_input_prim_type_specified = false;
 292    this->tcs_output_vertices_specified = false;
 293    this->gs_input_size = 0;
 294    this->in_qualifier = new(this) ast_type_qualifier();
 295    this->out_qualifier = new(this) ast_type_qualifier();
 296    this->fs_early_fragment_tests = false;
 297    this->fs_inner_coverage = false;
 298    this->fs_post_depth_coverage = false;
 299    this->fs_blend_support = 0;
 300    memset(this->atomic_counter_offsets, 0,
 301           sizeof(this->atomic_counter_offsets));
 302    this->allow_extension_directive_midshader =
 303       ctx->Const.AllowGLSLExtensionDirectiveMidShader;
 304
 305    this->cs_input_local_size_variable_specified = false;
 306 }
 307
 308 /**
 309  * Determine whether the current GLSL version is sufficiently high to support
 310  * a certain feature, and generate an error message if it isn't.
 311  *
 312  * \param required_glsl_version and \c required_glsl_es_version are
 313  * interpreted as they are in _mesa_glsl_parse_state::is_version().
 314  *
 315  * \param locp is the parser location where the error should be reported.
 316  *
 317  * \param fmt (and additional arguments) constitute a printf-style error
 318  * message to report if the version check fails.  Information about the
 319  * current and required GLSL versions will be appended.  So, for example, if
 320  * the GLSL version being compiled is 1.20, and check_version(130, 300, locp,
 321  * "foo unsupported") is called, the error message will be "foo unsupported in
 322  * GLSL 1.20 (GLSL 1.30 or GLSL 3.00 ES required)".
 323  */
 324 bool
 325 _mesa_glsl_parse_state::check_version(unsigned required_glsl_version,
 326                                       unsigned required_glsl_es_version,
 327                                       YYLTYPE *locp, const char *fmt, ...)
 328 {
 329    if (this->is_version(required_glsl_version, required_glsl_es_version))
 330       return true;
 331
 332    va_list args;
 333    va_start(args, fmt);
 334    char *problem = ralloc_vasprintf(this, fmt, args);
 335    va_end(args);
 336    const char *glsl_version_string
 337       = glsl_compute_version_string(this, false, required_glsl_version);
 338    const char *glsl_es_version_string
 339       = glsl_compute_version_string(this, true, required_glsl_es_version);
 340    const char *requirement_string = "";
 341    if (required_glsl_version && required_glsl_es_version) {
 342       requirement_string = ralloc_asprintf(this, " (%s or %s required)",
 343                                            glsl_version_string,
 344                                            glsl_es_version_string);
 345    } else if (required_glsl_version) {
 346       requirement_string = ralloc_asprintf(this, " (%s required)",
 347                                            glsl_version_string);
 348    } else if (required_glsl_es_version) {
 349       requirement_string = ralloc_asprintf(this, " (%s required)",
 350                                            glsl_es_version_string);
 351    }
 352    _mesa_glsl_error(locp, this, "%s in %s%s",
 353                     problem, this->get_version_string(),
 354                     requirement_string);
 355
 356    return false;
 357 }
 358
 359 /**
 360  * Process a GLSL #version directive.
 361  *
 362  * \param version is the integer that follows the #version token.
 363  *
 364  * \param ident is a string identifier that follows the integer, if any is
 365  * present.  Otherwise NULL.
 366  */
 367 void
 368 _mesa_glsl_parse_state::process_version_directive(YYLTYPE *locp, int version,
 369                                                   const char *ident)
 370 {
 371    bool es_token_present = false;
 372    if (ident) {
 373       if (strcmp(ident, "es") == 0) {
 374          es_token_present = true;
 375       } else if (version >= 150) {
 376          if (strcmp(ident, "core") == 0) {
 377             /* Accept the token.  There's no need to record that this is
 378              * a core profile shader since that's the only profile we support.
 379              */
 380          } else if (strcmp(ident, "compatibility") == 0) {
 381             _mesa_glsl_error(locp, this,
 382                              "the compatibility profile is not supported");
 383          } else {
 384             _mesa_glsl_error(locp, this,
 385                              "\"%s\" is not a valid shading language profile; "
 386                              "if present, it must be \"core\"", ident);
 387          }
 388       } else {
 389          _mesa_glsl_error(locp, this,
 390                           "illegal text following version number");
 391       }
 392    }
 393
 394    this->es_shader = es_token_present;
 395    if (version == 100) {
 396       if (es_token_present) {
 397          _mesa_glsl_error(locp, this,
 398                           "GLSL 1.00 ES should be selected using "
 399                           "`#version 100'");
 400       } else {
 401          this->es_shader = true;
 402       }
 403    }
 404
 405    if (this->es_shader) {
 406       this->ARB_texture_rectangle_enable = false;
 407    }
 408
 409    if (this->forced_language_version)
 410       this->language_version = this->forced_language_version;
 411    else
 412       this->language_version = version;
 413
 414    bool supported = false;
 415    for (unsigned i = 0; i < this->num_supported_versions; i++) {
 416       if (this->supported_versions[i].ver == this->language_version
 417           && this->supported_versions[i].es == this->es_shader) {
 418          this->gl_version = this->supported_versions[i].gl_ver;
 419          supported = true;
 420          break;
 421       }
 422    }
 423
 424    if (!supported) {
 425       _mesa_glsl_error(locp, this, "%s is not supported. "
 426                        "Supported versions are: %s",
 427                        this->get_version_string(),
 428                        this->supported_version_string);
 429
 430       /* On exit, the language_version must be set to a valid value.
 431        * Later calls to _mesa_glsl_initialize_types will misbehave if
 432        * the version is invalid.
 433        */
 434       switch (this->ctx->API) {
 435       case API_OPENGL_COMPAT:
 436       case API_OPENGL_CORE:
 437          this->language_version = this->ctx->Const.GLSLVersion;
 438          break;
 439
 440       case API_OPENGLES:
 441          assert(!"Should not get here.");
 442          /* FALLTHROUGH */
 443
 444       case API_OPENGLES2:
 445          this->language_version = 100;
 446          break;
 447       }
 448    }
 449 }
 450
 451
 452 /* This helper function will append the given message to the shader's
 453    info log and report it via GL_ARB_debug_output. Per that extension,
 454    'type' is one of the enum values classifying the message, and
 455    'id' is the implementation-defined ID of the given message. */
 456 static void
 457 _mesa_glsl_msg(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 458                GLenum type, const char *fmt, va_list ap)
 459 {
 460    bool error = (type == MESA_DEBUG_TYPE_ERROR);
 461    GLuint msg_id = 0;
 462
 463    assert(state->info_log != NULL);
 464
 465    /* Get the offset that the new message will be written to. */
 466    int msg_offset = strlen(state->info_log);
 467
 468    ralloc_asprintf_append(&state->info_log, "%u:%u(%u): %s: ",
 469                                             locp->source,
 470                                             locp->first_line,
 471                                             locp->first_column,
 472                                             error ? "error" : "warning");
 473    ralloc_vasprintf_append(&state->info_log, fmt, ap);
 474
 475    const char *const msg = &state->info_log[msg_offset];
 476    struct gl_context *ctx = state->ctx;
 477
 478    /* Report the error via GL_ARB_debug_output. */
 479    _mesa_shader_debug(ctx, type, &msg_id, msg);
 480
 481    ralloc_strcat(&state->info_log, "\n");
 482 }
 483
 484 void
 485 _mesa_glsl_error(YYLTYPE *locp, _mesa_glsl_parse_state *state,
 486                  const char *fmt, ...)
 487 {
 488    va_list ap;
 489
 490    state->error = true;
 491
 492    va_start(ap, fmt);
 493    _mesa_glsl_msg(locp, state, MESA_DEBUG_TYPE_ERROR, fmt, ap);
 494    va_end(ap);
 495 }
 496
 497
 498 void
 499 _mesa_glsl_warning(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 500                    const char *fmt, ...)
 501 {
 502    va_list ap;
 503
 504    va_start(ap, fmt);
 505    _mesa_glsl_msg(locp, state, MESA_DEBUG_TYPE_OTHER, fmt, ap);
 506    va_end(ap);
 507 }
 508
 509
 510 /**
 511  * Enum representing the possible behaviors that can be specified in
 512  * an #extension directive.
 513  */
 514 enum ext_behavior {
 515    extension_disable,
 516    extension_enable,
 517    extension_require,
 518    extension_warn
 519 };
 520
 521 /**
 522  * Element type for _mesa_glsl_supported_extensions
 523  */
 524 struct _mesa_glsl_extension {
 525    /**
 526     * Name of the extension when referred to in a GLSL extension
 527     * statement
 528     */
 529    const char *name;
 530
 531    /**
 532     * Whether this extension is a part of AEP
 533     */
 534    bool aep;
 535
 536    /**
 537     * Predicate that checks whether the relevant extension is available for
 538     * this context.
 539     */
 540    bool (*available_pred)(const struct gl_context *,
 541                           gl_api api, uint8_t version);
 542
 543    /**
 544     * Flag in the _mesa_glsl_parse_state struct that should be set
 545     * when this extension is enabled.
 546     *
 547     * See note in _mesa_glsl_extension::supported_flag about "pointer
 548     * to member" types.
 549     */
 550    bool _mesa_glsl_parse_state::* enable_flag;
 551
 552    /**
 553     * Flag in the _mesa_glsl_parse_state struct that should be set
 554     * when the shader requests "warn" behavior for this extension.
 555     *
 556     * See note in _mesa_glsl_extension::supported_flag about "pointer
 557     * to member" types.
 558     */
 559    bool _mesa_glsl_parse_state::* warn_flag;
 560
 561
 562    bool compatible_with_state(const _mesa_glsl_parse_state *state,
 563                               gl_api api, uint8_t gl_version) const;
 564    void set_flags(_mesa_glsl_parse_state *state, ext_behavior behavior) const;
 565 };
 566
 567 /** Checks if the context supports a user-facing extension */
 568 #define EXT(name_str, driver_cap, ...) \
 569 static MAYBE_UNUSED bool \
 570 has_##name_str(const struct gl_context *ctx, gl_api api, uint8_t version) \
 571 { \
 572    return ctx->Extensions.driver_cap && (version >= \
 573           _mesa_extension_table[MESA_EXTENSION_##name_str].version[api]); \
 574 }
 575 #include "main/extensions_table.h"
 576 #undef EXT
 577
 578 #define EXT(NAME)                                           \
 579    { "GL_" #NAME, false, has_##NAME,                        \
 580      &_mesa_glsl_parse_state::NAME##_enable,                \
 581      &_mesa_glsl_parse_state::NAME##_warn }
 582
 583 #define EXT_AEP(NAME)                                       \
 584    { "GL_" #NAME, true, has_##NAME,                         \
 585      &_mesa_glsl_parse_state::NAME##_enable,                \
 586      &_mesa_glsl_parse_state::NAME##_warn }
 587
 588 /**
 589  * Table of extensions that can be enabled/disabled within a shader,
 590  * and the conditions under which they are supported.
 591  */
 592 static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
 593    /* ARB extensions go here, sorted alphabetically.
 594     */
 595    EXT(ARB_ES3_1_compatibility),
 596    EXT(ARB_ES3_2_compatibility),
 597    EXT(ARB_arrays_of_arrays),
 598    EXT(ARB_compute_shader),
 599    EXT(ARB_compute_variable_group_size),
 600    EXT(ARB_conservative_depth),
 601    EXT(ARB_cull_distance),
 602    EXT(ARB_derivative_control),
 603    EXT(ARB_draw_buffers),
 604    EXT(ARB_draw_instanced),
 605    EXT(ARB_enhanced_layouts),
 606    EXT(ARB_explicit_attrib_location),
 607    EXT(ARB_explicit_uniform_location),
 608    EXT(ARB_fragment_coord_conventions),
 609    EXT(ARB_fragment_layer_viewport),
 610    EXT(ARB_gpu_shader5),
 611    EXT(ARB_gpu_shader_fp64),
 612    EXT(ARB_gpu_shader_int64),
 613    EXT(ARB_post_depth_coverage),
 614    EXT(ARB_sample_shading),
 615    EXT(ARB_separate_shader_objects),
 616    EXT(ARB_shader_atomic_counter_ops),
 617    EXT(ARB_shader_atomic_counters),
 618    EXT(ARB_shader_bit_encoding),
 619    EXT(ARB_shader_clock),
 620    EXT(ARB_shader_draw_parameters),
 621    EXT(ARB_shader_group_vote),
 622    EXT(ARB_shader_image_load_store),
 623    EXT(ARB_shader_image_size),
 624    EXT(ARB_shader_precision),
 625    EXT(ARB_shader_stencil_export),
 626    EXT(ARB_shader_storage_buffer_object),
 627    EXT(ARB_shader_subroutine),
 628    EXT(ARB_shader_texture_image_samples),
 629    EXT(ARB_shader_texture_lod),
 630    EXT(ARB_shader_viewport_layer_array),
 631    EXT(ARB_shading_language_420pack),
 632    EXT(ARB_shading_language_packing),
 633    EXT(ARB_tessellation_shader),
 634    EXT(ARB_texture_cube_map_array),
 635    EXT(ARB_texture_gather),
 636    EXT(ARB_texture_multisample),
 637    EXT(ARB_texture_query_levels),
 638    EXT(ARB_texture_query_lod),
 639    EXT(ARB_texture_rectangle),
 640    EXT(ARB_uniform_buffer_object),
 641    EXT(ARB_vertex_attrib_64bit),
 642    EXT(ARB_viewport_array),
 643
 644    /* KHR extensions go here, sorted alphabetically.
 645     */
 646    EXT_AEP(KHR_blend_equation_advanced),
 647
 648    /* OES extensions go here, sorted alphabetically.
 649     */
 650    EXT(OES_EGL_image_external),
 651    EXT(OES_geometry_point_size),
 652    EXT(OES_geometry_shader),
 653    EXT(OES_gpu_shader5),
 654    EXT(OES_primitive_bounding_box),
 655    EXT_AEP(OES_sample_variables),
 656    EXT_AEP(OES_shader_image_atomic),
 657    EXT(OES_shader_io_blocks),
 658    EXT_AEP(OES_shader_multisample_interpolation),
 659    EXT(OES_standard_derivatives),
 660    EXT(OES_tessellation_point_size),
 661    EXT(OES_tessellation_shader),
 662    EXT(OES_texture_3D),
 663    EXT(OES_texture_buffer),
 664    EXT(OES_texture_cube_map_array),
 665    EXT_AEP(OES_texture_storage_multisample_2d_array),
 666    EXT(OES_viewport_array),
 667
 668    /* All other extensions go here, sorted alphabetically.
 669     */
 670    EXT(AMD_conservative_depth),
 671    EXT(AMD_shader_stencil_export),
 672    EXT(AMD_shader_trinary_minmax),
 673    EXT(AMD_vertex_shader_layer),
 674    EXT(AMD_vertex_shader_viewport_index),
 675    EXT(ANDROID_extension_pack_es31a),
 676    EXT(EXT_blend_func_extended),
 677    EXT(EXT_draw_buffers),
 678    EXT(EXT_clip_cull_distance),
 679    EXT(EXT_geometry_point_size),
 680    EXT_AEP(EXT_geometry_shader),
 681    EXT_AEP(EXT_gpu_shader5),
 682    EXT_AEP(EXT_primitive_bounding_box),
 683    EXT(EXT_separate_shader_objects),
 684    EXT(EXT_shader_framebuffer_fetch),
 685    EXT(EXT_shader_integer_mix),
 686    EXT_AEP(EXT_shader_io_blocks),
 687    EXT(EXT_shader_samples_identical),
 688    EXT(EXT_tessellation_point_size),
 689    EXT_AEP(EXT_tessellation_shader),
 690    EXT(EXT_texture_array),
 691    EXT_AEP(EXT_texture_buffer),
 692    EXT_AEP(EXT_texture_cube_map_array),
 693    EXT(INTEL_conservative_rasterization),
 694    EXT(MESA_shader_integer_functions),
 695    EXT(NV_image_formats),
 696 };
 697
 698 #undef EXT
 699
 700
 701 /**
 702  * Determine whether a given extension is compatible with the target,
 703  * API, and extension information in the current parser state.
 704  */
 705 bool _mesa_glsl_extension::compatible_with_state(
 706       const _mesa_glsl_parse_state *state, gl_api api, uint8_t gl_version) const
 707 {
 708    return this->available_pred(state->ctx, api, gl_version);
 709 }
 710
 711 /**
 712  * Set the appropriate flags in the parser state to establish the
 713  * given behavior for this extension.
 714  */
 715 void _mesa_glsl_extension::set_flags(_mesa_glsl_parse_state *state,
 716                                      ext_behavior behavior) const
 717 {
 718    /* Note: the ->* operator indexes into state by the
 719     * offsets this->enable_flag and this->warn_flag.  See
 720     * _mesa_glsl_extension::supported_flag for more info.
 721     */
 722    state->*(this->enable_flag) = (behavior != extension_disable);
 723    state->*(this->warn_flag)   = (behavior == extension_warn);
 724 }
 725
 726 /**
 727  * Find an extension by name in _mesa_glsl_supported_extensions.  If
 728  * the name is not found, return NULL.
 729  */
 730 static const _mesa_glsl_extension *find_extension(const char *name)
 731 {
 732    for (unsigned i = 0; i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
 733       if (strcmp(name, _mesa_glsl_supported_extensions[i].name) == 0) {
 734          return &_mesa_glsl_supported_extensions[i];
 735       }
 736    }
 737    return NULL;
 738 }
 739
 740 bool
 741 _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
 742                              const char *behavior_string, YYLTYPE *behavior_locp,
 743                              _mesa_glsl_parse_state *state)
 744 {
 745    uint8_t gl_version = state->ctx->Extensions.Version;
 746    gl_api api = state->ctx->API;
 747    ext_behavior behavior;
 748    if (strcmp(behavior_string, "warn") == 0) {
 749       behavior = extension_warn;
 750    } else if (strcmp(behavior_string, "require") == 0) {
 751       behavior = extension_require;
 752    } else if (strcmp(behavior_string, "enable") == 0) {
 753       behavior = extension_enable;
 754    } else if (strcmp(behavior_string, "disable") == 0) {
 755       behavior = extension_disable;
 756    } else {
 757       _mesa_glsl_error(behavior_locp, state,
 758                        "unknown extension behavior `%s'",
 759                        behavior_string);
 760       return false;
 761    }
 762
 763    /* If we're in a desktop context but with an ES shader, use an ES API enum
 764     * to verify extension availability.
 765     */
 766    if (state->es_shader && api != API_OPENGLES2)
 767       api = API_OPENGLES2;
 768    /* Use the language-version derived GL version to extension checks, unless
 769     * we're using meta, which sets the version to the max.
 770     */
 771    if (gl_version != 0xff)
 772       gl_version = state->gl_version;
 773
 774    if (strcmp(name, "all") == 0) {
 775       if ((behavior == extension_enable) || (behavior == extension_require)) {
 776          _mesa_glsl_error(name_locp, state, "cannot %s all extensions",
 777                           (behavior == extension_enable)
 778                           ? "enable" : "require");
 779          return false;
 780       } else {
 781          for (unsigned i = 0;
 782               i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
 783             const _mesa_glsl_extension *extension
 784                = &_mesa_glsl_supported_extensions[i];
 785             if (extension->compatible_with_state(state, api, gl_version)) {
 786                _mesa_glsl_supported_extensions[i].set_flags(state, behavior);
 787             }
 788          }
 789       }
 790    } else {
 791       const _mesa_glsl_extension *extension = find_extension(name);
 792       if (extension && extension->compatible_with_state(state, api, gl_version)) {
 793          extension->set_flags(state, behavior);
 794          if (extension->available_pred == has_ANDROID_extension_pack_es31a) {
 795             for (unsigned i = 0;
 796                  i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
 797                const _mesa_glsl_extension *extension =
 798                   &_mesa_glsl_supported_extensions[i];
 799
 800                if (!extension->aep)
 801                   continue;
 802                /* AEP should not be enabled if all of the sub-extensions can't
 803                 * also be enabled. This is not the proper layer to do such
 804                 * error-checking though.
 805                 */
 806                assert(extension->compatible_with_state(state, api, gl_version));
 807                extension->set_flags(state, behavior);
 808             }
 809          }
 810       } else {
 811          static const char fmt[] = "extension `%s' unsupported in %s shader";
 812
 813          if (behavior == extension_require) {
 814             _mesa_glsl_error(name_locp, state, fmt,
 815                              name, _mesa_shader_stage_to_string(state->stage));
 816             return false;
 817          } else {
 818             _mesa_glsl_warning(name_locp, state, fmt,
 819                                name, _mesa_shader_stage_to_string(state->stage));
 820          }
 821       }
 822    }
 823
 824    return true;
 825 }
 826
 827
 828 /**
 829  * Recurses through <type> and <expr> if <expr> is an aggregate initializer
 830  * and sets <expr>'s <constructor_type> field to <type>. Gives later functions
 831  * (process_array_constructor, et al) sufficient information to do type
 832  * checking.
 833  *
 834  * Operates on assignments involving an aggregate initializer. E.g.,
 835  *
 836  * vec4 pos = {1.0, -1.0, 0.0, 1.0};
 837  *
 838  * or more ridiculously,
 839  *
 840  * struct S {
 841  *     vec4 v[2];
 842  * };
 843  *
 844  * struct {
 845  *     S a[2], b;
 846  *     int c;
 847  * } aggregate = {
 848  *     {
 849  *         {
 850  *             {
 851  *                 {1.0, 2.0, 3.0, 4.0}, // a[0].v[0]
 852  *                 {5.0, 6.0, 7.0, 8.0}  // a[0].v[1]
 853  *             } // a[0].v
 854  *         }, // a[0]
 855  *         {
 856  *             {
 857  *                 {1.0, 2.0, 3.0, 4.0}, // a[1].v[0]
 858  *                 {5.0, 6.0, 7.0, 8.0}  // a[1].v[1]
 859  *             } // a[1].v
 860  *         } // a[1]
 861  *     }, // a
 862  *     {
 863  *         {
 864  *             {1.0, 2.0, 3.0, 4.0}, // b.v[0]
 865  *             {5.0, 6.0, 7.0, 8.0}  // b.v[1]
 866  *         } // b.v
 867  *     }, // b
 868  *     4 // c
 869  * };
 870  *
 871  * This pass is necessary because the right-hand side of <type> e = { ... }
 872  * doesn't contain sufficient information to determine if the types match.
 873  */
 874 void
 875 _mesa_ast_set_aggregate_type(const glsl_type *type,
 876                              ast_expression *expr)
 877 {
 878    ast_aggregate_initializer *ai = (ast_aggregate_initializer *)expr;
 879    ai->constructor_type = type;
 880
 881    /* If the aggregate is an array, recursively set its elements' types. */
 882    if (type->is_array()) {
 883       /* Each array element has the type type->fields.array.
 884        *
 885        * E.g., if <type> if struct S[2] we want to set each element's type to
 886        * struct S.
 887        */
 888       for (exec_node *expr_node = ai->expressions.get_head_raw();
 889            !expr_node->is_tail_sentinel();
 890            expr_node = expr_node->next) {
 891          ast_expression *expr = exec_node_data(ast_expression, expr_node,
 892                                                link);
 893
 894          if (expr->oper == ast_aggregate)
 895             _mesa_ast_set_aggregate_type(type->fields.array, expr);
 896       }
 897
 898    /* If the aggregate is a struct, recursively set its fields' types. */
 899    } else if (type->is_record()) {
 900       exec_node *expr_node = ai->expressions.get_head_raw();
 901
 902       /* Iterate through the struct's fields. */
 903       for (unsigned i = 0; !expr_node->is_tail_sentinel() && i < type->length;
 904            i++, expr_node = expr_node->next) {
 905          ast_expression *expr = exec_node_data(ast_expression, expr_node,
 906                                                link);
 907
 908          if (expr->oper == ast_aggregate) {
 909             _mesa_ast_set_aggregate_type(type->fields.structure[i].type, expr);
 910          }
 911       }
 912    /* If the aggregate is a matrix, set its columns' types. */
 913    } else if (type->is_matrix()) {
 914       for (exec_node *expr_node = ai->expressions.get_head_raw();
 915            !expr_node->is_tail_sentinel();
 916            expr_node = expr_node->next) {
 917          ast_expression *expr = exec_node_data(ast_expression, expr_node,
 918                                                link);
 919
 920          if (expr->oper == ast_aggregate)
 921             _mesa_ast_set_aggregate_type(type->column_type(), expr);
 922       }
 923    }
 924 }
 925
 926 void
 927 _mesa_ast_process_interface_block(YYLTYPE *locp,
 928                                   _mesa_glsl_parse_state *state,
 929                                   ast_interface_block *const block,
 930                                   const struct ast_type_qualifier &q)
 931 {
 932    if (q.flags.q.buffer) {
 933       if (!state->has_shader_storage_buffer_objects()) {
 934          _mesa_glsl_error(locp, state,
 935                           "#version 430 / GL_ARB_shader_storage_buffer_object "
 936                           "required for defining shader storage blocks");
 937       } else if (state->ARB_shader_storage_buffer_object_warn) {
 938          _mesa_glsl_warning(locp, state,
 939                             "#version 430 / GL_ARB_shader_storage_buffer_object "
 940                             "required for defining shader storage blocks");
 941       }
 942    } else if (q.flags.q.uniform) {
 943       if (!state->has_uniform_buffer_objects()) {
 944          _mesa_glsl_error(locp, state,
 945                           "#version 140 / GL_ARB_uniform_buffer_object "
 946                           "required for defining uniform blocks");
 947       } else if (state->ARB_uniform_buffer_object_warn) {
 948          _mesa_glsl_warning(locp, state,
 949                             "#version 140 / GL_ARB_uniform_buffer_object "
 950                             "required for defining uniform blocks");
 951       }
 952    } else {
 953       if (!state->has_shader_io_blocks()) {
 954          if (state->es_shader) {
 955             _mesa_glsl_error(locp, state,
 956                              "GL_OES_shader_io_blocks or #version 320 "
 957                              "required for using interface blocks");
 958          } else {
 959             _mesa_glsl_error(locp, state,
 960                              "#version 150 required for using "
 961                              "interface blocks");
 962          }
 963       }
 964    }
 965
 966    /* From the GLSL 1.50.11 spec, section 4.3.7 ("Interface Blocks"):
 967     * "It is illegal to have an input block in a vertex shader
 968     *  or an output block in a fragment shader"
 969     */
 970    if ((state->stage == MESA_SHADER_VERTEX) && q.flags.q.in) {
 971       _mesa_glsl_error(locp, state,
 972                        "`in' interface block is not allowed for "
 973                        "a vertex shader");
 974    } else if ((state->stage == MESA_SHADER_FRAGMENT) && q.flags.q.out) {
 975       _mesa_glsl_error(locp, state,
 976                        "`out' interface block is not allowed for "
 977                        "a fragment shader");
 978    }
 979
 980    /* Since block arrays require names, and both features are added in
 981     * the same language versions, we don't have to explicitly
 982     * version-check both things.
 983     */
 984    if (block->instance_name != NULL) {
 985       state->check_version(150, 300, locp, "interface blocks with "
 986                            "an instance name are not allowed");
 987    }
 988
 989    uint64_t interface_type_mask;
 990    struct ast_type_qualifier temp_type_qualifier;
 991
 992    /* Get a bitmask containing only the in/out/uniform/buffer
 993     * flags, allowing us to ignore other irrelevant flags like
 994     * interpolation qualifiers.
 995     */
 996    temp_type_qualifier.flags.i = 0;
 997    temp_type_qualifier.flags.q.uniform = true;
 998    temp_type_qualifier.flags.q.in = true;
 999    temp_type_qualifier.flags.q.out = true;
1000    temp_type_qualifier.flags.q.buffer = true;
1001    temp_type_qualifier.flags.q.patch = true;
1002    interface_type_mask = temp_type_qualifier.flags.i;
1003
1004    /* Get the block's interface qualifier.  The interface_qualifier
1005     * production rule guarantees that only one bit will be set (and
1006     * it will be in/out/uniform).
1007     */
1008    uint64_t block_interface_qualifier = q.flags.i;
1009
1010    block->default_layout.flags.i |= block_interface_qualifier;
1011
1012    if (state->stage == MESA_SHADER_GEOMETRY &&
1013        state->has_explicit_attrib_stream() &&
1014        block->default_layout.flags.q.out) {
1015       /* Assign global layout's stream value. */
1016       block->default_layout.flags.q.stream = 1;
1017       block->default_layout.flags.q.explicit_stream = 0;
1018       block->default_layout.stream = state->out_qualifier->stream;
1019    }
1020
1021    if (state->has_enhanced_layouts() && block->default_layout.flags.q.out) {
1022       /* Assign global layout's xfb_buffer value. */
1023       block->default_layout.flags.q.xfb_buffer = 1;
1024       block->default_layout.flags.q.explicit_xfb_buffer = 0;
1025       block->default_layout.xfb_buffer = state->out_qualifier->xfb_buffer;
1026    }
1027
1028    foreach_list_typed (ast_declarator_list, member, link, &block->declarations) {
1029       ast_type_qualifier& qualifier = member->type->qualifier;
1030       if ((qualifier.flags.i & interface_type_mask) == 0) {
1031          /* GLSLangSpec.1.50.11, 4.3.7 (Interface Blocks):
1032           * "If no optional qualifier is used in a member declaration, the
1033           *  qualifier of the variable is just in, out, or uniform as declared
1034           *  by interface-qualifier."
1035           */
1036          qualifier.flags.i |= block_interface_qualifier;
1037       } else if ((qualifier.flags.i & interface_type_mask) !=
1038                  block_interface_qualifier) {
1039          /* GLSLangSpec.1.50.11, 4.3.7 (Interface Blocks):
1040           * "If optional qualifiers are used, they can include interpolation
1041           *  and storage qualifiers and they must declare an input, output,
1042           *  or uniform variable consistent with the interface qualifier of
1043           *  the block."
1044           */
1045          _mesa_glsl_error(locp, state,
1046                           "uniform/in/out qualifier on "
1047                           "interface block member does not match "
1048                           "the interface block");
1049       }
1050
1051       if (!(q.flags.q.in || q.flags.q.out) && qualifier.flags.q.invariant)
1052          _mesa_glsl_error(locp, state,
1053                           "invariant qualifiers can be used only "
1054                           "in interface block members for shader "
1055                           "inputs or outputs");
1056    }
1057 }
1058
1059 void
1060 _mesa_ast_type_qualifier_print(const struct ast_type_qualifier *q)
1061 {
1062    if (q->flags.q.subroutine)
1063       printf("subroutine ");
1064
1065    if (q->flags.q.subroutine_def) {
1066       printf("subroutine (");
1067       q->subroutine_list->print();
1068       printf(")");
1069    }
1070
1071    if (q->flags.q.constant)
1072       printf("const ");
1073
1074    if (q->flags.q.invariant)
1075       printf("invariant ");
1076
1077    if (q->flags.q.attribute)
1078       printf("attribute ");
1079
1080    if (q->flags.q.varying)
1081       printf("varying ");
1082
1083    if (q->flags.q.in && q->flags.q.out)
1084       printf("inout ");
1085    else {
1086       if (q->flags.q.in)
1087          printf("in ");
1088
1089       if (q->flags.q.out)
1090          printf("out ");
1091    }
1092
1093    if (q->flags.q.centroid)
1094       printf("centroid ");
1095    if (q->flags.q.sample)
1096       printf("sample ");
1097    if (q->flags.q.patch)
1098       printf("patch ");
1099    if (q->flags.q.uniform)
1100       printf("uniform ");
1101    if (q->flags.q.buffer)
1102       printf("buffer ");
1103    if (q->flags.q.smooth)
1104       printf("smooth ");
1105    if (q->flags.q.flat)
1106       printf("flat ");
1107    if (q->flags.q.noperspective)
1108       printf("noperspective ");
1109 }
1110
1111
1112 void
1113 ast_node::print(void) const
1114 {
1115    printf("unhandled node ");
1116 }
1117
1118
1119 ast_node::ast_node(void)
1120 {
1121    this->location.source = 0;
1122    this->location.first_line = 0;
1123    this->location.first_column = 0;
1124    this->location.last_line = 0;
1125    this->location.last_column = 0;
1126 }
1127
1128
1129 static void
1130 ast_opt_array_dimensions_print(const ast_array_specifier *array_specifier)
1131 {
1132    if (array_specifier)
1133       array_specifier->print();
1134 }
1135
1136
1137 void
1138 ast_compound_statement::print(void) const
1139 {
1140    printf("{\n");
1141
1142    foreach_list_typed(ast_node, ast, link, &this->statements) {
1143       ast->print();
1144    }
1145
1146    printf("}\n");
1147 }
1148
1149
1150 ast_compound_statement::ast_compound_statement(int new_scope,
1151                                                ast_node *statements)
1152 {
1153    this->new_scope = new_scope;
1154
1155    if (statements != NULL) {
1156       this->statements.push_degenerate_list_at_head(&statements->link);
1157    }
1158 }
1159
1160
1161 void
1162 ast_expression::print(void) const
1163 {
1164    switch (oper) {
1165    case ast_assign:
1166    case ast_mul_assign:
1167    case ast_div_assign:
1168    case ast_mod_assign:
1169    case ast_add_assign:
1170    case ast_sub_assign:
1171    case ast_ls_assign:
1172    case ast_rs_assign:
1173    case ast_and_assign:
1174    case ast_xor_assign:
1175    case ast_or_assign:
1176       subexpressions[0]->print();
1177       printf("%s ", operator_string(oper));
1178       subexpressions[1]->print();
1179       break;
1180
1181    case ast_field_selection:
1182       subexpressions[0]->print();
1183       printf(". %s ", primary_expression.identifier);
1184       break;
1185
1186    case ast_plus:
1187    case ast_neg:
1188    case ast_bit_not:
1189    case ast_logic_not:
1190    case ast_pre_inc:
1191    case ast_pre_dec:
1192       printf("%s ", operator_string(oper));
1193       subexpressions[0]->print();
1194       break;
1195
1196    case ast_post_inc:
1197    case ast_post_dec:
1198       subexpressions[0]->print();
1199       printf("%s ", operator_string(oper));
1200       break;
1201
1202    case ast_conditional:
1203       subexpressions[0]->print();
1204       printf("? ");
1205       subexpressions[1]->print();
1206       printf(": ");
1207       subexpressions[2]->print();
1208       break;
1209
1210    case ast_array_index:
1211       subexpressions[0]->print();
1212       printf("[ ");
1213       subexpressions[1]->print();
1214       printf("] ");
1215       break;
1216
1217    case ast_function_call: {
1218       subexpressions[0]->print();
1219       printf("( ");
1220
1221       foreach_list_typed (ast_node, ast, link, &this->expressions) {
1222          if (&ast->link != this->expressions.get_head())
1223             printf(", ");
1224
1225          ast->print();
1226       }
1227
1228       printf(") ");
1229       break;
1230    }
1231
1232    case ast_identifier:
1233       printf("%s ", primary_expression.identifier);
1234       break;
1235
1236    case ast_int_constant:
1237       printf("%d ", primary_expression.int_constant);
1238       break;
1239
1240    case ast_uint_constant:
1241       printf("%u ", primary_expression.uint_constant);
1242       break;
1243
1244    case ast_float_constant:
1245       printf("%f ", primary_expression.float_constant);
1246       break;
1247
1248    case ast_double_constant:
1249       printf("%f ", primary_expression.double_constant);
1250       break;
1251
1252    case ast_int64_constant:
1253       printf("%" PRId64 " ", primary_expression.int64_constant);
1254       break;
1255
1256    case ast_uint64_constant:
1257       printf("%" PRIu64 " ", primary_expression.uint64_constant);
1258       break;
1259
1260    case ast_bool_constant:
1261       printf("%s ",
1262              primary_expression.bool_constant
1263              ? "true" : "false");
1264       break;
1265
1266    case ast_sequence: {
1267       printf("( ");
1268       foreach_list_typed (ast_node, ast, link, & this->expressions) {
1269          if (&ast->link != this->expressions.get_head())
1270             printf(", ");
1271
1272          ast->print();
1273       }
1274       printf(") ");
1275       break;
1276    }
1277
1278    case ast_aggregate: {
1279       printf("{ ");
1280       foreach_list_typed (ast_node, ast, link, & this->expressions) {
1281          if (&ast->link != this->expressions.get_head())
1282             printf(", ");
1283
1284          ast->print();
1285       }
1286       printf("} ");
1287       break;
1288    }
1289
1290    default:
1291       assert(0);
1292       break;
1293    }
1294 }
1295
1296 ast_expression::ast_expression(int oper,
1297                                ast_expression *ex0,
1298                                ast_expression *ex1,
1299                                ast_expression *ex2) :
1300    primary_expression()
1301 {
1302    this->oper = ast_operators(oper);
1303    this->subexpressions[0] = ex0;
1304    this->subexpressions[1] = ex1;
1305    this->subexpressions[2] = ex2;
1306    this->non_lvalue_description = NULL;
1307    this->is_lhs = false;
1308 }
1309
1310
1311 void
1312 ast_expression_statement::print(void) const
1313 {
1314    if (expression)
1315       expression->print();
1316
1317    printf("; ");
1318 }
1319
1320
1321 ast_expression_statement::ast_expression_statement(ast_expression *ex) :
1322    expression(ex)
1323 {
1324    /* empty */
1325 }
1326
1327
1328 void
1329 ast_function::print(void) const
1330 {
1331    return_type->print();
1332    printf(" %s (", identifier);
1333
1334    foreach_list_typed(ast_node, ast, link, & this->parameters) {
1335       ast->print();
1336    }
1337
1338    printf(")");
1339 }
1340
1341
1342 ast_function::ast_function(void)
1343    : return_type(NULL), identifier(NULL), is_definition(false),
1344      signature(NULL)
1345 {
1346    /* empty */
1347 }
1348
1349
1350 void
1351 ast_fully_specified_type::print(void) const
1352 {
1353    _mesa_ast_type_qualifier_print(& qualifier);
1354    specifier->print();
1355 }
1356
1357
1358 void
1359 ast_parameter_declarator::print(void) const
1360 {
1361    type->print();
1362    if (identifier)
1363       printf("%s ", identifier);
1364    ast_opt_array_dimensions_print(array_specifier);
1365 }
1366
1367
1368 void
1369 ast_function_definition::print(void) const
1370 {
1371    prototype->print();
1372    body->print();
1373 }
1374
1375
1376 void
1377 ast_declaration::print(void) const
1378 {
1379    printf("%s ", identifier);
1380    ast_opt_array_dimensions_print(array_specifier);
1381
1382    if (initializer) {
1383       printf("= ");
1384       initializer->print();
1385    }
1386 }
1387
1388
1389 ast_declaration::ast_declaration(const char *identifier,
1390                                  ast_array_specifier *array_specifier,
1391                                  ast_expression *initializer)
1392 {
1393    this->identifier = identifier;
1394    this->array_specifier = array_specifier;
1395    this->initializer = initializer;
1396 }
1397
1398
1399 void
1400 ast_declarator_list::print(void) const
1401 {
1402    assert(type || invariant);
1403
1404    if (type)
1405       type->print();
1406    else if (invariant)
1407       printf("invariant ");
1408    else
1409       printf("precise ");
1410
1411    foreach_list_typed (ast_node, ast, link, & this->declarations) {
1412       if (&ast->link != this->declarations.get_head())
1413          printf(", ");
1414
1415       ast->print();
1416    }
1417
1418    printf("; ");
1419 }
1420
1421
1422 ast_declarator_list::ast_declarator_list(ast_fully_specified_type *type)
1423 {
1424    this->type = type;
1425    this->invariant = false;
1426    this->precise = false;
1427 }
1428
1429 void
1430 ast_jump_statement::print(void) const
1431 {
1432    switch (mode) {
1433    case ast_continue:
1434       printf("continue; ");
1435       break;
1436    case ast_break:
1437       printf("break; ");
1438       break;
1439    case ast_return:
1440       printf("return ");
1441       if (opt_return_value)
1442          opt_return_value->print();
1443
1444       printf("; ");
1445       break;
1446    case ast_discard:
1447       printf("discard; ");
1448       break;
1449    }
1450 }
1451
1452
1453 ast_jump_statement::ast_jump_statement(int mode, ast_expression *return_value)
1454    : opt_return_value(NULL)
1455 {
1456    this->mode = ast_jump_modes(mode);
1457
1458    if (mode == ast_return)
1459       opt_return_value = return_value;
1460 }
1461
1462
1463 void
1464 ast_selection_statement::print(void) const
1465 {
1466    printf("if ( ");
1467    condition->print();
1468    printf(") ");
1469
1470    then_statement->print();
1471
1472    if (else_statement) {
1473       printf("else ");
1474       else_statement->print();
1475    }
1476 }
1477
1478
1479 ast_selection_statement::ast_selection_statement(ast_expression *condition,
1480                                                  ast_node *then_statement,
1481                                                  ast_node *else_statement)
1482 {
1483    this->condition = condition;
1484    this->then_statement = then_statement;
1485    this->else_statement = else_statement;
1486 }
1487
1488
1489 void
1490 ast_switch_statement::print(void) const
1491 {
1492    printf("switch ( ");
1493    test_expression->print();
1494    printf(") ");
1495
1496    body->print();
1497 }
1498
1499
1500 ast_switch_statement::ast_switch_statement(ast_expression *test_expression,
1501                                            ast_node *body)
1502 {
1503    this->test_expression = test_expression;
1504    this->body = body;
1505 }
1506
1507
1508 void
1509 ast_switch_body::print(void) const
1510 {
1511    printf("{\n");
1512    if (stmts != NULL) {
1513       stmts->print();
1514    }
1515    printf("}\n");
1516 }
1517
1518
1519 ast_switch_body::ast_switch_body(ast_case_statement_list *stmts)
1520 {
1521    this->stmts = stmts;
1522 }
1523
1524
1525 void ast_case_label::print(void) const
1526 {
1527    if (test_value != NULL) {
1528       printf("case ");
1529       test_value->print();
1530       printf(": ");
1531    } else {
1532       printf("default: ");
1533    }
1534 }
1535
1536
1537 ast_case_label::ast_case_label(ast_expression *test_value)
1538 {
1539    this->test_value = test_value;
1540 }
1541
1542
1543 void ast_case_label_list::print(void) const
1544 {
1545    foreach_list_typed(ast_node, ast, link, & this->labels) {
1546       ast->print();
1547    }
1548    printf("\n");
1549 }
1550
1551
1552 ast_case_label_list::ast_case_label_list(void)
1553 {
1554 }
1555
1556
1557 void ast_case_statement::print(void) const
1558 {
1559    labels->print();
1560    foreach_list_typed(ast_node, ast, link, & this->stmts) {
1561       ast->print();
1562       printf("\n");
1563    }
1564 }
1565
1566
1567 ast_case_statement::ast_case_statement(ast_case_label_list *labels)
1568 {
1569    this->labels = labels;
1570 }
1571
1572
1573 void ast_case_statement_list::print(void) const
1574 {
1575    foreach_list_typed(ast_node, ast, link, & this->cases) {
1576       ast->print();
1577    }
1578 }
1579
1580
1581 ast_case_statement_list::ast_case_statement_list(void)
1582 {
1583 }
1584
1585
1586 void
1587 ast_iteration_statement::print(void) const
1588 {
1589    switch (mode) {
1590    case ast_for:
1591       printf("for( ");
1592       if (init_statement)
1593          init_statement->print();
1594       printf("; ");
1595
1596       if (condition)
1597          condition->print();
1598       printf("; ");
1599
1600       if (rest_expression)
1601          rest_expression->print();
1602       printf(") ");
1603
1604       body->print();
1605       break;
1606
1607    case ast_while:
1608       printf("while ( ");
1609       if (condition)
1610          condition->print();
1611       printf(") ");
1612       body->print();
1613       break;
1614
1615    case ast_do_while:
1616       printf("do ");
1617       body->print();
1618       printf("while ( ");
1619       if (condition)
1620          condition->print();
1621       printf("); ");
1622       break;
1623    }
1624 }
1625
1626
1627 ast_iteration_statement::ast_iteration_statement(int mode,
1628                                                  ast_node *init,
1629                                                  ast_node *condition,
1630                                                  ast_expression *rest_expression,
1631                                                  ast_node *body)
1632 {
1633    this->mode = ast_iteration_modes(mode);
1634    this->init_statement = init;
1635    this->condition = condition;
1636    this->rest_expression = rest_expression;
1637    this->body = body;
1638 }
1639
1640
1641 void
1642 ast_struct_specifier::print(void) const
1643 {
1644    printf("struct %s { ", name);
1645    foreach_list_typed(ast_node, ast, link, &this->declarations) {
1646       ast->print();
1647    }
1648    printf("} ");
1649 }
1650
1651
1652 ast_struct_specifier::ast_struct_specifier(void *lin_ctx, const char *identifier,
1653                                            ast_declarator_list *declarator_list)
1654 {
1655    if (identifier == NULL) {
1656       static mtx_t mutex = _MTX_INITIALIZER_NP;
1657       static unsigned anon_count = 1;
1658       unsigned count;
1659
1660       mtx_lock(&mutex);
1661       count = anon_count++;
1662       mtx_unlock(&mutex);
1663
1664       identifier = linear_asprintf(lin_ctx, "#anon_struct_%04x", count);
1665    }
1666    name = identifier;
1667    this->declarations.push_degenerate_list_at_head(&declarator_list->link);
1668    is_declaration = true;
1669    layout = NULL;
1670 }
1671
1672 void ast_subroutine_list::print(void) const
1673 {
1674    foreach_list_typed (ast_node, ast, link, & this->declarations) {
1675       if (&ast->link != this->declarations.get_head())
1676          printf(", ");
1677       ast->print();
1678    }
1679 }
1680
1681 static void
1682 set_shader_inout_layout(struct gl_shader *shader,
1683                      struct _mesa_glsl_parse_state *state)
1684 {
1685    /* Should have been prevented by the parser. */
1686    if (shader->Stage == MESA_SHADER_TESS_CTRL ||
1687        shader->Stage == MESA_SHADER_VERTEX) {
1688       assert(!state->in_qualifier->flags.i);
1689    } else if (shader->Stage != MESA_SHADER_GEOMETRY &&
1690               shader->Stage != MESA_SHADER_TESS_EVAL) {
1691       assert(!state->in_qualifier->flags.i);
1692    }
1693
1694    if (shader->Stage != MESA_SHADER_COMPUTE) {
1695       /* Should have been prevented by the parser. */
1696       assert(!state->cs_input_local_size_specified);
1697       assert(!state->cs_input_local_size_variable_specified);
1698    }
1699
1700    if (shader->Stage != MESA_SHADER_FRAGMENT) {
1701       /* Should have been prevented by the parser. */
1702       assert(!state->fs_uses_gl_fragcoord);
1703       assert(!state->fs_redeclares_gl_fragcoord);
1704       assert(!state->fs_pixel_center_integer);
1705       assert(!state->fs_origin_upper_left);
1706       assert(!state->fs_early_fragment_tests);
1707       assert(!state->fs_inner_coverage);
1708       assert(!state->fs_post_depth_coverage);
1709    }
1710
1711    for (unsigned i = 0; i < MAX_FEEDBACK_BUFFERS; i++) {
1712       if (state->out_qualifier->out_xfb_stride[i]) {
1713          unsigned xfb_stride;
1714          if (state->out_qualifier->out_xfb_stride[i]->
1715                 process_qualifier_constant(state, "xfb_stride", &xfb_stride,
1716                 true)) {
1717             shader->TransformFeedbackBufferStride[i] = xfb_stride;
1718          }
1719       }
1720    }
1721
1722    switch (shader->Stage) {
1723    case MESA_SHADER_TESS_CTRL:
1724       shader->info.TessCtrl.VerticesOut = 0;
1725       if (state->tcs_output_vertices_specified) {
1726          unsigned vertices;
1727          if (state->out_qualifier->vertices->
1728                process_qualifier_constant(state, "vertices", &vertices,
1729                                           false)) {
1730
1731             YYLTYPE loc = state->out_qualifier->vertices->get_location();
1732             if (vertices > state->Const.MaxPatchVertices) {
1733                _mesa_glsl_error(&loc, state, "vertices (%d) exceeds "
1734                                 "GL_MAX_PATCH_VERTICES", vertices);
1735             }
1736             shader->info.TessCtrl.VerticesOut = vertices;
1737          }
1738       }
1739       break;
1740    case MESA_SHADER_TESS_EVAL:
1741       shader->info.TessEval.PrimitiveMode = PRIM_UNKNOWN;
1742       if (state->in_qualifier->flags.q.prim_type)
1743          shader->info.TessEval.PrimitiveMode = state->in_qualifier->prim_type;
1744
1745       shader->info.TessEval.Spacing = TESS_SPACING_UNSPECIFIED;
1746       if (state->in_qualifier->flags.q.vertex_spacing)
1747          shader->info.TessEval.Spacing = state->in_qualifier->vertex_spacing;
1748
1749       shader->info.TessEval.VertexOrder = 0;
1750       if (state->in_qualifier->flags.q.ordering)
1751          shader->info.TessEval.VertexOrder = state->in_qualifier->ordering;
1752
1753       shader->info.TessEval.PointMode = -1;
1754       if (state->in_qualifier->flags.q.point_mode)
1755          shader->info.TessEval.PointMode = state->in_qualifier->point_mode;
1756       break;
1757    case MESA_SHADER_GEOMETRY:
1758       shader->info.Geom.VerticesOut = -1;
1759       if (state->out_qualifier->flags.q.max_vertices) {
1760          unsigned qual_max_vertices;
1761          if (state->out_qualifier->max_vertices->
1762                process_qualifier_constant(state, "max_vertices",
1763                                           &qual_max_vertices, true)) {
1764
1765             if (qual_max_vertices > state->Const.MaxGeometryOutputVertices) {
1766                YYLTYPE loc = state->out_qualifier->max_vertices->get_location();
1767                _mesa_glsl_error(&loc, state,
1768                                 "maximum output vertices (%d) exceeds "
1769                                 "GL_MAX_GEOMETRY_OUTPUT_VERTICES",
1770                                 qual_max_vertices);
1771             }
1772             shader->info.Geom.VerticesOut = qual_max_vertices;
1773          }
1774       }
1775
1776       if (state->gs_input_prim_type_specified) {
1777          shader->info.Geom.InputType = state->in_qualifier->prim_type;
1778       } else {
1779          shader->info.Geom.InputType = PRIM_UNKNOWN;
1780       }
1781
1782       if (state->out_qualifier->flags.q.prim_type) {
1783          shader->info.Geom.OutputType = state->out_qualifier->prim_type;
1784       } else {
1785          shader->info.Geom.OutputType = PRIM_UNKNOWN;
1786       }
1787
1788       shader->info.Geom.Invocations = 0;
1789       if (state->in_qualifier->flags.q.invocations) {
1790          unsigned invocations;
1791          if (state->in_qualifier->invocations->
1792                process_qualifier_constant(state, "invocations",
1793                                           &invocations, false)) {
1794
1795             YYLTYPE loc = state->in_qualifier->invocations->get_location();
1796             if (invocations > MAX_GEOMETRY_SHADER_INVOCATIONS) {
1797                _mesa_glsl_error(&loc, state,
1798                                 "invocations (%d) exceeds "
1799                                 "GL_MAX_GEOMETRY_SHADER_INVOCATIONS",
1800                                 invocations);
1801             }
1802             shader->info.Geom.Invocations = invocations;
1803          }
1804       }
1805       break;
1806
1807    case MESA_SHADER_COMPUTE:
1808       if (state->cs_input_local_size_specified) {
1809          for (int i = 0; i < 3; i++)
1810             shader->info.Comp.LocalSize[i] = state->cs_input_local_size[i];
1811       } else {
1812          for (int i = 0; i < 3; i++)
1813             shader->info.Comp.LocalSize[i] = 0;
1814       }
1815
1816       shader->info.Comp.LocalSizeVariable =
1817          state->cs_input_local_size_variable_specified;
1818       break;
1819
1820    case MESA_SHADER_FRAGMENT:
1821       shader->redeclares_gl_fragcoord = state->fs_redeclares_gl_fragcoord;
1822       shader->uses_gl_fragcoord = state->fs_uses_gl_fragcoord;
1823       shader->pixel_center_integer = state->fs_pixel_center_integer;
1824       shader->origin_upper_left = state->fs_origin_upper_left;
1825       shader->ARB_fragment_coord_conventions_enable =
1826          state->ARB_fragment_coord_conventions_enable;
1827       shader->EarlyFragmentTests = state->fs_early_fragment_tests;
1828       shader->InnerCoverage = state->fs_inner_coverage;
1829       shader->PostDepthCoverage = state->fs_post_depth_coverage;
1830       shader->BlendSupport = state->fs_blend_support;
1831       break;
1832
1833    default:
1834       /* Nothing to do. */
1835       break;
1836    }
1837 }
1838
1839 extern "C" {
1840
1841 static void
1842 assign_subroutine_indexes(struct gl_shader *sh,
1843                           struct _mesa_glsl_parse_state *state)
1844 {
1845    int j, k;
1846    int index = 0;
1847
1848    for (j = 0; j < state->num_subroutines; j++) {
1849       while (state->subroutines[j]->subroutine_index == -1) {
1850          for (k = 0; k < state->num_subroutines; k++) {
1851             if (state->subroutines[k]->subroutine_index == index)
1852                break;
1853             else if (k == state->num_subroutines - 1) {
1854                state->subroutines[j]->subroutine_index = index;
1855             }
1856          }
1857          index++;
1858       }
1859    }
1860 }
1861
1862 static void
1863 add_builtin_defines(struct _mesa_glsl_parse_state *state,
1864                     void (*add_builtin_define)(struct glcpp_parser *, const char *, int),
1865                     struct glcpp_parser *data,
1866                     unsigned version,
1867                     bool es)
1868 {
1869    unsigned gl_version = state->ctx->Extensions.Version;
1870    gl_api api = state->ctx->API;
1871
1872    if (gl_version != 0xff) {
1873       unsigned i;
1874       for (i = 0; i < state->num_supported_versions; i++) {
1875          if (state->supported_versions[i].ver == version &&
1876              state->supported_versions[i].es == es) {
1877             gl_version = state->supported_versions[i].gl_ver;
1878             break;
1879          }
1880       }
1881
1882       if (i == state->num_supported_versions)
1883          return;
1884    }
1885
1886    if (es)
1887       api = API_OPENGLES2;
1888
1889    for (unsigned i = 0;
1890         i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
1891       const _mesa_glsl_extension *extension
1892          = &_mesa_glsl_supported_extensions[i];
1893       if (extension->compatible_with_state(state, api, gl_version)) {
1894          add_builtin_define(data, extension->name, 1);
1895       }
1896    }
1897 }
1898
1899 /* Implements parsing checks that we can't do during parsing */
1900 static void
1901 do_late_parsing_checks(struct _mesa_glsl_parse_state *state)
1902 {
1903    if (state->stage == MESA_SHADER_COMPUTE && !state->has_compute_shader()) {
1904       YYLTYPE loc;
1905       memset(&loc, 0, sizeof(loc));
1906       _mesa_glsl_error(&loc, state, "Compute shaders require "
1907                        "GLSL 4.30 or GLSL ES 3.10");
1908    }
1909 }
1910
1911 void
1912 _mesa_glsl_compile_shader(struct gl_context *ctx, struct gl_shader *shader,
1913                           bool dump_ast, bool dump_hir)
1914 {
1915    struct _mesa_glsl_parse_state *state =
1916       new(shader) _mesa_glsl_parse_state(ctx, shader->Stage, shader);
1917    const char *source = shader->Source;
1918
1919    if (ctx->Const.GenerateTemporaryNames)
1920       (void) p_atomic_cmpxchg(&ir_variable::temporaries_allocate_names,
1921                               false, true);
1922
1923    state->error = glcpp_preprocess(state, &source, &state->info_log,
1924                              add_builtin_defines, state, ctx);
1925
1926    if (!state->error) {
1927      _mesa_glsl_lexer_ctor(state, source);
1928      _mesa_glsl_parse(state);
1929      _mesa_glsl_lexer_dtor(state);
1930      do_late_parsing_checks(state);
1931    }
1932
1933    if (dump_ast) {
1934       foreach_list_typed(ast_node, ast, link, &state->translation_unit) {
1935          ast->print();
1936       }
1937       printf("\n\n");
1938    }
1939
1940    ralloc_free(shader->ir);
1941    shader->ir = new(shader) exec_list;
1942    if (!state->error && !state->translation_unit.is_empty())
1943       _mesa_ast_to_hir(shader->ir, state);
1944
1945    if (!state->error) {
1946       validate_ir_tree(shader->ir);
1947
1948       /* Print out the unoptimized IR. */
1949       if (dump_hir) {
1950          _mesa_print_ir(stdout, shader->ir, state);
1951       }
1952    }
1953
1954
1955    if (!state->error && !shader->ir->is_empty()) {
1956       struct gl_shader_compiler_options *options =
1957          &ctx->Const.ShaderCompilerOptions[shader->Stage];
1958
1959       assign_subroutine_indexes(shader, state);
1960       lower_subroutine(shader->ir, state);
1961
1962       /* Do some optimization at compile time to reduce shader IR size
1963        * and reduce later work if the same shader is linked multiple times
1964        */
1965       if (ctx->Const.GLSLOptimizeConservatively) {
1966          /* Run it just once. */
1967          do_common_optimization(shader->ir, false, false, options,
1968                                 ctx->Const.NativeIntegers);
1969       } else {
1970          /* Repeat it until it stops making changes. */
1971          while (do_common_optimization(shader->ir, false, false, options,
1972                                        ctx->Const.NativeIntegers))
1973             ;
1974       }
1975
1976       validate_ir_tree(shader->ir);
1977
1978       enum ir_variable_mode other;
1979       switch (shader->Stage) {
1980       case MESA_SHADER_VERTEX:
1981          other = ir_var_shader_in;
1982          break;
1983       case MESA_SHADER_FRAGMENT:
1984          other = ir_var_shader_out;
1985          break;
1986       default:
1987          /* Something invalid to ensure optimize_dead_builtin_uniforms
1988           * doesn't remove anything other than uniforms or constants.
1989           */
1990          other = ir_var_mode_count;
1991          break;
1992       }
1993
1994       optimize_dead_builtin_variables(shader->ir, other);
1995
1996       validate_ir_tree(shader->ir);
1997    }
1998
1999    if (shader->InfoLog)
2000       ralloc_free(shader->InfoLog);
2001
2002    if (!state->error)
2003       set_shader_inout_layout(shader, state);
2004
2005    shader->symbols = new(shader->ir) glsl_symbol_table;
2006    shader->CompileStatus = !state->error;
2007    shader->InfoLog = state->info_log;
2008    shader->Version = state->language_version;
2009    shader->IsES = state->es_shader;
2010
2011    /* Retain any live IR, but trash the rest. */
2012    reparent_ir(shader->ir, shader->ir);
2013
2014    /* Destroy the symbol table.  Create a new symbol table that contains only
2015     * the variables and functions that still exist in the IR.  The symbol
2016     * table will be used later during linking.
2017     *
2018     * There must NOT be any freed objects still referenced by the symbol
2019     * table.  That could cause the linker to dereference freed memory.
2020     *
2021     * We don't have to worry about types or interface-types here because those
2022     * are fly-weights that are looked up by glsl_type.
2023     */
2024    foreach_in_list (ir_instruction, ir, shader->ir) {
2025       switch (ir->ir_type) {
2026       case ir_type_function:
2027          shader->symbols->add_function((ir_function *) ir);
2028          break;
2029       case ir_type_variable: {
2030          ir_variable *const var = (ir_variable *) ir;
2031
2032          if (var->data.mode != ir_var_temporary)
2033             shader->symbols->add_variable(var);
2034          break;
2035       }
2036       default:
2037          break;
2038       }
2039    }
2040
2041    _mesa_glsl_initialize_derived_variables(ctx, shader);
2042
2043    delete state->symbols;
2044    ralloc_free(state);
2045 }
2046
2047 } /* extern "C" */
2048 /**
2049  * Do the set of common optimizations passes
2050  *
2051  * \param ir                          List of instructions to be optimized
2052  * \param linked                      Is the shader linked?  This enables
2053  *                                    optimizations passes that remove code at
2054  *                                    global scope and could cause linking to
2055  *                                    fail.
2056  * \param uniform_locations_assigned  Have locations already been assigned for
2057  *                                    uniforms?  This prevents the declarations
2058  *                                    of unused uniforms from being removed.
2059  *                                    The setting of this flag only matters if
2060  *                                    \c linked is \c true.
2061  * \param options                     The driver's preferred shader options.
2062  * \param native_integers             Selects optimizations that depend on the
2063  *                                    implementations supporting integers
2064  *                                    natively (as opposed to supporting
2065  *                                    integers in floating point registers).
2066  */
2067 bool
2068 do_common_optimization(exec_list *ir, bool linked,
2069                        bool uniform_locations_assigned,
2070                        const struct gl_shader_compiler_options *options,
2071                        bool native_integers)
2072 {
2073    const bool debug = false;
2074    GLboolean progress = GL_FALSE;
2075
2076 #define OPT(PASS, ...) do {                                             \
2077       if (debug) {                                                      \
2078          fprintf(stderr, "START GLSL optimization %s\n", #PASS);        \
2079          const bool opt_progress = PASS(__VA_ARGS__);                   \
2080          progress = opt_progress || progress;                           \
2081          if (opt_progress)                                              \
2082             _mesa_print_ir(stderr, ir, NULL);                           \
2083          fprintf(stderr, "GLSL optimization %s: %s progress\n",         \
2084                  #PASS, opt_progress ? "made" : "no");                  \
2085       } else {                                                          \
2086          progress = PASS(__VA_ARGS__) || progress;                      \
2087       }                                                                 \
2088    } while (false)
2089
2090    OPT(lower_instructions, ir, SUB_TO_ADD_NEG);
2091
2092    if (linked) {
2093       OPT(do_function_inlining, ir);
2094       OPT(do_dead_functions, ir);
2095       OPT(do_structure_splitting, ir);
2096    }
2097    propagate_invariance(ir);
2098    OPT(do_if_simplification, ir);
2099    OPT(opt_flatten_nested_if_blocks, ir);
2100    OPT(opt_conditional_discard, ir);
2101    OPT(do_copy_propagation, ir);
2102    OPT(do_copy_propagation_elements, ir);
2103
2104    if (options->OptimizeForAOS && !linked)
2105       OPT(opt_flip_matrices, ir);
2106
2107    if (linked && options->OptimizeForAOS) {
2108       OPT(do_vectorize, ir);
2109    }
2110
2111    if (linked)
2112       OPT(do_dead_code, ir, uniform_locations_assigned);
2113    else
2114       OPT(do_dead_code_unlinked, ir);
2115    OPT(do_dead_code_local, ir);
2116    OPT(do_tree_grafting, ir);
2117    OPT(do_constant_propagation, ir);
2118    if (linked)
2119       OPT(do_constant_variable, ir);
2120    else
2121       OPT(do_constant_variable_unlinked, ir);
2122    OPT(do_constant_folding, ir);
2123    OPT(do_minmax_prune, ir);
2124    OPT(do_rebalance_tree, ir);
2125    OPT(do_algebraic, ir, native_integers, options);
2126    OPT(do_lower_jumps, ir, true, true, options->EmitNoMainReturn,
2127        options->EmitNoCont, options->EmitNoLoops);
2128    OPT(do_vec_index_to_swizzle, ir);
2129    OPT(lower_vector_insert, ir, false);
2130    OPT(do_swizzle_swizzle, ir);
2131    OPT(do_noop_swizzle, ir);
2132
2133    OPT(optimize_split_arrays, ir, linked);
2134    OPT(optimize_redundant_jumps, ir);
2135
2136    if (options->MaxUnrollIterations) {
2137       loop_state *ls = analyze_loop_variables(ir);
2138       if (ls->loop_found) {
2139          OPT(set_loop_controls, ir, ls);
2140          OPT(unroll_loops, ir, ls, options);
2141       }
2142       delete ls;
2143    }
2144
2145 #undef OPT
2146
2147    return progress;
2148 }
2149
2150 extern "C" {
2151
2152 /**
2153  * To be called at GL teardown time, this frees compiler datastructures.
2154  *
2155  * After calling this, any previously compiled shaders and shader
2156  * programs would be invalid.  So this should happen at approximately
2157  * program exit.
2158  */
2159 void
2160 _mesa_destroy_shader_compiler(void)
2161 {
2162    _mesa_destroy_shader_compiler_caches();
2163
2164    _mesa_glsl_release_types();
2165 }
2166
2167 /**
2168  * Releases compiler caches to trade off performance for memory.
2169  *
2170  * Intended to be used with glReleaseShaderCompiler().
2171  */
2172 void
2173 _mesa_destroy_shader_compiler_caches(void)
2174 {
2175    _mesa_glsl_release_builtin_functions();
2176 }
2177
2178 }