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 #define __STDC_FORMAT_MACROS 1
  24 #include <inttypes.h> /* for PRIx64 macro */
  25 #include <stdio.h>
  26 #include <stdarg.h>
  27 #include <string.h>
  28 #include <assert.h>
  29
  30 #include "main/core.h" /* for struct gl_context */
  31 #include "main/context.h"
  32 #include "main/debug_output.h"
  33 #include "main/formats.h"
  34 #include "main/shaderobj.h"
  35 #include "util/u_atomic.h" /* for p_atomic_cmpxchg */
  36 #include "util/ralloc.h"
  37 #include "ast.h"
  38 #include "glsl_parser_extras.h"
  39 #include "glsl_parser.h"
  40 #include "ir_optimization.h"
  41 #include "loop_analysis.h"
  42 #include "builtin_functions.h"
  43
  44 /**
  45  * Format a short human-readable description of the given GLSL version.
  46  */
  47 const char *
  48 glsl_compute_version_string(void *mem_ctx, bool is_es, unsigned version)
  49 {
  50    return ralloc_asprintf(mem_ctx, "GLSL%s %d.%02d", is_es ? " ES" : "",
  51                           version / 100, version % 100);
  52 }
  53
  54
  55 static const unsigned known_desktop_glsl_versions[] =
  56    { 110, 120, 130, 140, 150, 330, 400, 410, 420, 430, 440, 450 };
  57 static const unsigned known_desktop_gl_versions[] =
  58    {  20,  21,  30,  31,  32,  33,  40,  41,  42,  43,  44,  45 };
  59
  60
  61 _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
  62                                                gl_shader_stage stage,
  63                                                void *mem_ctx)
  64    : ctx(_ctx), cs_input_local_size_specified(false), cs_input_local_size(),
  65      switch_state()
  66 {
  67    assert(stage < MESA_SHADER_STAGES);
  68    this->stage = stage;
  69
  70    this->scanner = NULL;
  71    this->translation_unit.make_empty();
  72    this->symbols = new(mem_ctx) glsl_symbol_table;
  73
  74    this->linalloc = linear_alloc_parent(this, 0);
  75
  76    this->info_log = ralloc_strdup(mem_ctx, "");
  77    this->error = false;
  78    this->loop_nesting_ast = NULL;
  79
  80    this->uses_builtin_functions = false;
  81
  82    /* Set default language version and extensions */
  83    this->language_version = 110;
  84    this->forced_language_version = ctx->Const.ForceGLSLVersion;
  85    this->zero_init = ctx->Const.GLSLZeroInit;
  86    this->gl_version = 20;
  87    this->es_shader = false;
  88    this->ARB_texture_rectangle_enable = true;
  89
  90    /* OpenGL ES 2.0 has different defaults from desktop GL. */
  91    if (ctx->API == API_OPENGLES2) {
  92       this->language_version = 100;
  93       this->es_shader = true;
  94       this->ARB_texture_rectangle_enable = false;
  95    }
  96
  97    this->extensions = &ctx->Extensions;
  98
  99    this->Const.MaxLights = ctx->Const.MaxLights;
 100    this->Const.MaxClipPlanes = ctx->Const.MaxClipPlanes;
 101    this->Const.MaxTextureUnits = ctx->Const.MaxTextureUnits;
 102    this->Const.MaxTextureCoords = ctx->Const.MaxTextureCoordUnits;
 103    this->Const.MaxVertexAttribs = ctx->Const.Program[MESA_SHADER_VERTEX].MaxAttribs;
 104    this->Const.MaxVertexUniformComponents = ctx->Const.Program[MESA_SHADER_VERTEX].MaxUniformComponents;
 105    this->Const.MaxVertexTextureImageUnits = ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits;
 106    this->Const.MaxCombinedTextureImageUnits = ctx->Const.MaxCombinedTextureImageUnits;
 107    this->Const.MaxTextureImageUnits = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits;
 108    this->Const.MaxFragmentUniformComponents = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxUniformComponents;
 109    this->Const.MinProgramTexelOffset = ctx->Const.MinProgramTexelOffset;
 110    this->Const.MaxProgramTexelOffset = ctx->Const.MaxProgramTexelOffset;
 111
 112    this->Const.MaxDrawBuffers = ctx->Const.MaxDrawBuffers;
 113
 114    this->Const.MaxDualSourceDrawBuffers = ctx->Const.MaxDualSourceDrawBuffers;
 115
 116    /* 1.50 constants */
 117    this->Const.MaxVertexOutputComponents = ctx->Const.Program[MESA_SHADER_VERTEX].MaxOutputComponents;
 118    this->Const.MaxGeometryInputComponents = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxInputComponents;
 119    this->Const.MaxGeometryOutputComponents = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxOutputComponents;
 120    this->Const.MaxFragmentInputComponents = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxInputComponents;
 121    this->Const.MaxGeometryTextureImageUnits = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits;
 122    this->Const.MaxGeometryOutputVertices = ctx->Const.MaxGeometryOutputVertices;
 123    this->Const.MaxGeometryTotalOutputComponents = ctx->Const.MaxGeometryTotalOutputComponents;
 124    this->Const.MaxGeometryUniformComponents = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxUniformComponents;
 125
 126    this->Const.MaxVertexAtomicCounters = ctx->Const.Program[MESA_SHADER_VERTEX].MaxAtomicCounters;
 127    this->Const.MaxTessControlAtomicCounters = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxAtomicCounters;
 128    this->Const.MaxTessEvaluationAtomicCounters = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxAtomicCounters;
 129    this->Const.MaxGeometryAtomicCounters = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxAtomicCounters;
 130    this->Const.MaxFragmentAtomicCounters = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxAtomicCounters;
 131    this->Const.MaxComputeAtomicCounters = ctx->Const.Program[MESA_SHADER_COMPUTE].MaxAtomicCounters;
 132    this->Const.MaxCombinedAtomicCounters = ctx->Const.MaxCombinedAtomicCounters;
 133    this->Const.MaxAtomicBufferBindings = ctx->Const.MaxAtomicBufferBindings;
 134    this->Const.MaxVertexAtomicCounterBuffers =
 135       ctx->Const.Program[MESA_SHADER_VERTEX].MaxAtomicBuffers;
 136    this->Const.MaxTessControlAtomicCounterBuffers =
 137       ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxAtomicBuffers;
 138    this->Const.MaxTessEvaluationAtomicCounterBuffers =
 139       ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxAtomicBuffers;
 140    this->Const.MaxGeometryAtomicCounterBuffers =
 141       ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxAtomicBuffers;
 142    this->Const.MaxFragmentAtomicCounterBuffers =
 143       ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxAtomicBuffers;
 144    this->Const.MaxComputeAtomicCounterBuffers =
 145       ctx->Const.Program[MESA_SHADER_COMPUTE].MaxAtomicBuffers;
 146    this->Const.MaxCombinedAtomicCounterBuffers =
 147       ctx->Const.MaxCombinedAtomicBuffers;
 148    this->Const.MaxAtomicCounterBufferSize =
 149       ctx->Const.MaxAtomicBufferSize;
 150
 151    /* ARB_enhanced_layouts constants */
 152    this->Const.MaxTransformFeedbackBuffers = ctx->Const.MaxTransformFeedbackBuffers;
 153    this->Const.MaxTransformFeedbackInterleavedComponents = ctx->Const.MaxTransformFeedbackInterleavedComponents;
 154
 155    /* Compute shader constants */
 156    for (unsigned i = 0; i < ARRAY_SIZE(this->Const.MaxComputeWorkGroupCount); i++)
 157       this->Const.MaxComputeWorkGroupCount[i] = ctx->Const.MaxComputeWorkGroupCount[i];
 158    for (unsigned i = 0; i < ARRAY_SIZE(this->Const.MaxComputeWorkGroupSize); i++)
 159       this->Const.MaxComputeWorkGroupSize[i] = ctx->Const.MaxComputeWorkGroupSize[i];
 160
 161    this->Const.MaxComputeTextureImageUnits = ctx->Const.Program[MESA_SHADER_COMPUTE].MaxTextureImageUnits;
 162    this->Const.MaxComputeUniformComponents = ctx->Const.Program[MESA_SHADER_COMPUTE].MaxUniformComponents;
 163
 164    this->Const.MaxImageUnits = ctx->Const.MaxImageUnits;
 165    this->Const.MaxCombinedShaderOutputResources = ctx->Const.MaxCombinedShaderOutputResources;
 166    this->Const.MaxImageSamples = ctx->Const.MaxImageSamples;
 167    this->Const.MaxVertexImageUniforms = ctx->Const.Program[MESA_SHADER_VERTEX].MaxImageUniforms;
 168    this->Const.MaxTessControlImageUniforms = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxImageUniforms;
 169    this->Const.MaxTessEvaluationImageUniforms = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxImageUniforms;
 170    this->Const.MaxGeometryImageUniforms = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxImageUniforms;
 171    this->Const.MaxFragmentImageUniforms = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxImageUniforms;
 172    this->Const.MaxComputeImageUniforms = ctx->Const.Program[MESA_SHADER_COMPUTE].MaxImageUniforms;
 173    this->Const.MaxCombinedImageUniforms = ctx->Const.MaxCombinedImageUniforms;
 174
 175    /* ARB_viewport_array */
 176    this->Const.MaxViewports = ctx->Const.MaxViewports;
 177
 178    /* tessellation shader constants */
 179    this->Const.MaxPatchVertices = ctx->Const.MaxPatchVertices;
 180    this->Const.MaxTessGenLevel = ctx->Const.MaxTessGenLevel;
 181    this->Const.MaxTessControlInputComponents = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxInputComponents;
 182    this->Const.MaxTessControlOutputComponents = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxOutputComponents;
 183    this->Const.MaxTessControlTextureImageUnits = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxTextureImageUnits;
 184    this->Const.MaxTessEvaluationInputComponents = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxInputComponents;
 185    this->Const.MaxTessEvaluationOutputComponents = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxOutputComponents;
 186    this->Const.MaxTessEvaluationTextureImageUnits = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxTextureImageUnits;
 187    this->Const.MaxTessPatchComponents = ctx->Const.MaxTessPatchComponents;
 188    this->Const.MaxTessControlTotalOutputComponents = ctx->Const.MaxTessControlTotalOutputComponents;
 189    this->Const.MaxTessControlUniformComponents = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxUniformComponents;
 190    this->Const.MaxTessEvaluationUniformComponents = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxUniformComponents;
 191
 192    /* GL 4.5 / OES_sample_variables */
 193    this->Const.MaxSamples = ctx->Const.MaxSamples;
 194
 195    this->current_function = NULL;
 196    this->toplevel_ir = NULL;
 197    this->found_return = false;
 198    this->all_invariant = false;
 199    this->user_structures = NULL;
 200    this->num_user_structures = 0;
 201    this->num_subroutines = 0;
 202    this->subroutines = NULL;
 203    this->num_subroutine_types = 0;
 204    this->subroutine_types = NULL;
 205
 206    /* supported_versions should be large enough to support the known desktop
 207     * GLSL versions plus 4 GLES versions (ES 1.00, ES 3.00, ES 3.10, ES 3.20)
 208     */
 209    STATIC_ASSERT((ARRAY_SIZE(known_desktop_glsl_versions) + 4) ==
 210                  ARRAY_SIZE(this->supported_versions));
 211
 212    /* Populate the list of supported GLSL versions */
 213    /* FINISHME: Once the OpenGL 3.0 'forward compatible' context or
 214     * the OpenGL 3.2 Core context is supported, this logic will need
 215     * change.  Older versions of GLSL are no longer supported
 216     * outside the compatibility contexts of 3.x.
 217     */
 218    this->num_supported_versions = 0;
 219    if (_mesa_is_desktop_gl(ctx)) {
 220       for (unsigned i = 0; i < ARRAY_SIZE(known_desktop_glsl_versions); i++) {
 221          if (known_desktop_glsl_versions[i] <= ctx->Const.GLSLVersion) {
 222             this->supported_versions[this->num_supported_versions].ver
 223                = known_desktop_glsl_versions[i];
 224             this->supported_versions[this->num_supported_versions].gl_ver
 225                = known_desktop_gl_versions[i];
 226             this->supported_versions[this->num_supported_versions].es = false;
 227             this->num_supported_versions++;
 228          }
 229       }
 230    }
 231    if (ctx->API == API_OPENGLES2 || ctx->Extensions.ARB_ES2_compatibility) {
 232       this->supported_versions[this->num_supported_versions].ver = 100;
 233       this->supported_versions[this->num_supported_versions].gl_ver = 20;
 234       this->supported_versions[this->num_supported_versions].es = true;
 235       this->num_supported_versions++;
 236    }
 237    if (_mesa_is_gles3(ctx) || ctx->Extensions.ARB_ES3_compatibility) {
 238       this->supported_versions[this->num_supported_versions].ver = 300;
 239       this->supported_versions[this->num_supported_versions].gl_ver = 30;
 240       this->supported_versions[this->num_supported_versions].es = true;
 241       this->num_supported_versions++;
 242    }
 243    if (_mesa_is_gles31(ctx) || ctx->Extensions.ARB_ES3_1_compatibility) {
 244       this->supported_versions[this->num_supported_versions].ver = 310;
 245       this->supported_versions[this->num_supported_versions].gl_ver = 31;
 246       this->supported_versions[this->num_supported_versions].es = true;
 247       this->num_supported_versions++;
 248    }
 249    if ((ctx->API == API_OPENGLES2 && ctx->Version >= 32) ||
 250        ctx->Extensions.ARB_ES3_2_compatibility) {
 251       this->supported_versions[this->num_supported_versions].ver = 320;
 252       this->supported_versions[this->num_supported_versions].gl_ver = 32;
 253       this->supported_versions[this->num_supported_versions].es = true;
 254       this->num_supported_versions++;
 255    }
 256
 257    /* Create a string for use in error messages to tell the user which GLSL
 258     * versions are supported.
 259     */
 260    char *supported = ralloc_strdup(this, "");
 261    for (unsigned i = 0; i < this->num_supported_versions; i++) {
 262       unsigned ver = this->supported_versions[i].ver;
 263       const char *const prefix = (i == 0)
 264          ? ""
 265          : ((i == this->num_supported_versions - 1) ? ", and " : ", ");
 266       const char *const suffix = (this->supported_versions[i].es) ? " ES" : "";
 267
 268       ralloc_asprintf_append(& supported, "%s%u.%02u%s",
 269                              prefix,
 270                              ver / 100, ver % 100,
 271                              suffix);
 272    }
 273
 274    this->supported_version_string = supported;
 275
 276    if (ctx->Const.ForceGLSLExtensionsWarn)
 277       _mesa_glsl_process_extension("all", NULL, "warn", NULL, this);
 278
 279    this->default_uniform_qualifier = new(this) ast_type_qualifier();
 280    this->default_uniform_qualifier->flags.q.shared = 1;
 281    this->default_uniform_qualifier->flags.q.column_major = 1;
 282
 283    this->default_shader_storage_qualifier = new(this) ast_type_qualifier();
 284    this->default_shader_storage_qualifier->flags.q.shared = 1;
 285    this->default_shader_storage_qualifier->flags.q.column_major = 1;
 286
 287    this->fs_uses_gl_fragcoord = false;
 288    this->fs_redeclares_gl_fragcoord = false;
 289    this->fs_origin_upper_left = false;
 290    this->fs_pixel_center_integer = false;
 291    this->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers = false;
 292
 293    this->gs_input_prim_type_specified = false;
 294    this->tcs_output_vertices_specified = false;
 295    this->gs_input_size = 0;
 296    this->in_qualifier = new(this) ast_type_qualifier();
 297    this->out_qualifier = new(this) ast_type_qualifier();
 298    this->fs_early_fragment_tests = false;
 299    this->fs_inner_coverage = false;
 300    this->fs_post_depth_coverage = false;
 301    this->fs_blend_support = 0;
 302    memset(this->atomic_counter_offsets, 0,
 303           sizeof(this->atomic_counter_offsets));
 304    this->allow_extension_directive_midshader =
 305       ctx->Const.AllowGLSLExtensionDirectiveMidShader;
 306
 307    this->cs_input_local_size_variable_specified = false;
 308 }
 309
 310 /**
 311  * Determine whether the current GLSL version is sufficiently high to support
 312  * a certain feature, and generate an error message if it isn't.
 313  *
 314  * \param required_glsl_version and \c required_glsl_es_version are
 315  * interpreted as they are in _mesa_glsl_parse_state::is_version().
 316  *
 317  * \param locp is the parser location where the error should be reported.
 318  *
 319  * \param fmt (and additional arguments) constitute a printf-style error
 320  * message to report if the version check fails.  Information about the
 321  * current and required GLSL versions will be appended.  So, for example, if
 322  * the GLSL version being compiled is 1.20, and check_version(130, 300, locp,
 323  * "foo unsupported") is called, the error message will be "foo unsupported in
 324  * GLSL 1.20 (GLSL 1.30 or GLSL 3.00 ES required)".
 325  */
 326 bool
 327 _mesa_glsl_parse_state::check_version(unsigned required_glsl_version,
 328                                       unsigned required_glsl_es_version,
 329                                       YYLTYPE *locp, const char *fmt, ...)
 330 {
 331    if (this->is_version(required_glsl_version, required_glsl_es_version))
 332       return true;
 333
 334    va_list args;
 335    va_start(args, fmt);
 336    char *problem = ralloc_vasprintf(this, fmt, args);
 337    va_end(args);
 338    const char *glsl_version_string
 339       = glsl_compute_version_string(this, false, required_glsl_version);
 340    const char *glsl_es_version_string
 341       = glsl_compute_version_string(this, true, required_glsl_es_version);
 342    const char *requirement_string = "";
 343    if (required_glsl_version && required_glsl_es_version) {
 344       requirement_string = ralloc_asprintf(this, " (%s or %s required)",
 345                                            glsl_version_string,
 346                                            glsl_es_version_string);
 347    } else if (required_glsl_version) {
 348       requirement_string = ralloc_asprintf(this, " (%s required)",
 349                                            glsl_version_string);
 350    } else if (required_glsl_es_version) {
 351       requirement_string = ralloc_asprintf(this, " (%s required)",
 352                                            glsl_es_version_string);
 353    }
 354    _mesa_glsl_error(locp, this, "%s in %s%s",
 355                     problem, this->get_version_string(),
 356                     requirement_string);
 357
 358    return false;
 359 }
 360
 361 /**
 362  * Process a GLSL #version directive.
 363  *
 364  * \param version is the integer that follows the #version token.
 365  *
 366  * \param ident is a string identifier that follows the integer, if any is
 367  * present.  Otherwise NULL.
 368  */
 369 void
 370 _mesa_glsl_parse_state::process_version_directive(YYLTYPE *locp, int version,
 371                                                   const char *ident)
 372 {
 373    bool es_token_present = false;
 374    if (ident) {
 375       if (strcmp(ident, "es") == 0) {
 376          es_token_present = true;
 377       } else if (version >= 150) {
 378          if (strcmp(ident, "core") == 0) {
 379             /* Accept the token.  There's no need to record that this is
 380              * a core profile shader since that's the only profile we support.
 381              */
 382          } else if (strcmp(ident, "compatibility") == 0) {
 383             _mesa_glsl_error(locp, this,
 384                              "the compatibility profile is not supported");
 385          } else {
 386             _mesa_glsl_error(locp, this,
 387                              "\"%s\" is not a valid shading language profile; "
 388                              "if present, it must be \"core\"", ident);
 389          }
 390       } else {
 391          _mesa_glsl_error(locp, this,
 392                           "illegal text following version number");
 393       }
 394    }
 395
 396    this->es_shader = es_token_present;
 397    if (version == 100) {
 398       if (es_token_present) {
 399          _mesa_glsl_error(locp, this,
 400                           "GLSL 1.00 ES should be selected using "
 401                           "`#version 100'");
 402       } else {
 403          this->es_shader = true;
 404       }
 405    }
 406
 407    if (this->es_shader) {
 408       this->ARB_texture_rectangle_enable = false;
 409    }
 410
 411    if (this->forced_language_version)
 412       this->language_version = this->forced_language_version;
 413    else
 414       this->language_version = version;
 415
 416    bool supported = false;
 417    for (unsigned i = 0; i < this->num_supported_versions; i++) {
 418       if (this->supported_versions[i].ver == this->language_version
 419           && this->supported_versions[i].es == this->es_shader) {
 420          this->gl_version = this->supported_versions[i].gl_ver;
 421          supported = true;
 422          break;
 423       }
 424    }
 425
 426    if (!supported) {
 427       _mesa_glsl_error(locp, this, "%s is not supported. "
 428                        "Supported versions are: %s",
 429                        this->get_version_string(),
 430                        this->supported_version_string);
 431
 432       /* On exit, the language_version must be set to a valid value.
 433        * Later calls to _mesa_glsl_initialize_types will misbehave if
 434        * the version is invalid.
 435        */
 436       switch (this->ctx->API) {
 437       case API_OPENGL_COMPAT:
 438       case API_OPENGL_CORE:
 439          this->language_version = this->ctx->Const.GLSLVersion;
 440          break;
 441
 442       case API_OPENGLES:
 443          assert(!"Should not get here.");
 444          /* FALLTHROUGH */
 445
 446       case API_OPENGLES2:
 447          this->language_version = 100;
 448          break;
 449       }
 450    }
 451 }
 452
 453
 454 /* This helper function will append the given message to the shader's
 455    info log and report it via GL_ARB_debug_output. Per that extension,
 456    'type' is one of the enum values classifying the message, and
 457    'id' is the implementation-defined ID of the given message. */
 458 static void
 459 _mesa_glsl_msg(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 460                GLenum type, const char *fmt, va_list ap)
 461 {
 462    bool error = (type == MESA_DEBUG_TYPE_ERROR);
 463    GLuint msg_id = 0;
 464
 465    assert(state->info_log != NULL);
 466
 467    /* Get the offset that the new message will be written to. */
 468    int msg_offset = strlen(state->info_log);
 469
 470    ralloc_asprintf_append(&state->info_log, "%u:%u(%u): %s: ",
 471                                             locp->source,
 472                                             locp->first_line,
 473                                             locp->first_column,
 474                                             error ? "error" : "warning");
 475    ralloc_vasprintf_append(&state->info_log, fmt, ap);
 476
 477    const char *const msg = &state->info_log[msg_offset];
 478    struct gl_context *ctx = state->ctx;
 479
 480    /* Report the error via GL_ARB_debug_output. */
 481    _mesa_shader_debug(ctx, type, &msg_id, msg);
 482
 483    ralloc_strcat(&state->info_log, "\n");
 484 }
 485
 486 void
 487 _mesa_glsl_error(YYLTYPE *locp, _mesa_glsl_parse_state *state,
 488                  const char *fmt, ...)
 489 {
 490    va_list ap;
 491
 492    state->error = true;
 493
 494    va_start(ap, fmt);
 495    _mesa_glsl_msg(locp, state, MESA_DEBUG_TYPE_ERROR, fmt, ap);
 496    va_end(ap);
 497 }
 498
 499
 500 void
 501 _mesa_glsl_warning(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 502                    const char *fmt, ...)
 503 {
 504    va_list ap;
 505
 506    va_start(ap, fmt);
 507    _mesa_glsl_msg(locp, state, MESA_DEBUG_TYPE_OTHER, fmt, ap);
 508    va_end(ap);
 509 }
 510
 511
 512 /**
 513  * Enum representing the possible behaviors that can be specified in
 514  * an #extension directive.
 515  */
 516 enum ext_behavior {
 517    extension_disable,
 518    extension_enable,
 519    extension_require,
 520    extension_warn
 521 };
 522
 523 /**
 524  * Element type for _mesa_glsl_supported_extensions
 525  */
 526 struct _mesa_glsl_extension {
 527    /**
 528     * Name of the extension when referred to in a GLSL extension
 529     * statement
 530     */
 531    const char *name;
 532
 533    /**
 534     * Whether this extension is a part of AEP
 535     */
 536    bool aep;
 537
 538    /**
 539     * Predicate that checks whether the relevant extension is available for
 540     * this context.
 541     */
 542    bool (*available_pred)(const struct gl_context *,
 543                           gl_api api, uint8_t version);
 544
 545    /**
 546     * Flag in the _mesa_glsl_parse_state struct that should be set
 547     * when this extension is enabled.
 548     *
 549     * See note in _mesa_glsl_extension::supported_flag about "pointer
 550     * to member" types.
 551     */
 552    bool _mesa_glsl_parse_state::* enable_flag;
 553
 554    /**
 555     * Flag in the _mesa_glsl_parse_state struct that should be set
 556     * when the shader requests "warn" behavior for this extension.
 557     *
 558     * See note in _mesa_glsl_extension::supported_flag about "pointer
 559     * to member" types.
 560     */
 561    bool _mesa_glsl_parse_state::* warn_flag;
 562
 563
 564    bool compatible_with_state(const _mesa_glsl_parse_state *state,
 565                               gl_api api, uint8_t gl_version) const;
 566    void set_flags(_mesa_glsl_parse_state *state, ext_behavior behavior) const;
 567 };
 568
 569 /** Checks if the context supports a user-facing extension */
 570 #define EXT(name_str, driver_cap, ...) \
 571 static MAYBE_UNUSED bool \
 572 has_##name_str(const struct gl_context *ctx, gl_api api, uint8_t version) \
 573 { \
 574    return ctx->Extensions.driver_cap && (version >= \
 575           _mesa_extension_table[MESA_EXTENSION_##name_str].version[api]); \
 576 }
 577 #include "main/extensions_table.h"
 578 #undef EXT
 579
 580 #define EXT(NAME)                                           \
 581    { "GL_" #NAME, false, has_##NAME,                        \
 582      &_mesa_glsl_parse_state::NAME##_enable,                \
 583      &_mesa_glsl_parse_state::NAME##_warn }
 584
 585 #define EXT_AEP(NAME)                                       \
 586    { "GL_" #NAME, true, has_##NAME,                         \
 587      &_mesa_glsl_parse_state::NAME##_enable,                \
 588      &_mesa_glsl_parse_state::NAME##_warn }
 589
 590 /**
 591  * Table of extensions that can be enabled/disabled within a shader,
 592  * and the conditions under which they are supported.
 593  */
 594 static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
 595    /* ARB extensions go here, sorted alphabetically.
 596     */
 597    EXT(ARB_ES3_1_compatibility),
 598    EXT(ARB_ES3_2_compatibility),
 599    EXT(ARB_arrays_of_arrays),
 600    EXT(ARB_compute_shader),
 601    EXT(ARB_compute_variable_group_size),
 602    EXT(ARB_conservative_depth),
 603    EXT(ARB_cull_distance),
 604    EXT(ARB_derivative_control),
 605    EXT(ARB_draw_buffers),
 606    EXT(ARB_draw_instanced),
 607    EXT(ARB_enhanced_layouts),
 608    EXT(ARB_explicit_attrib_location),
 609    EXT(ARB_explicit_uniform_location),
 610    EXT(ARB_fragment_coord_conventions),
 611    EXT(ARB_fragment_layer_viewport),
 612    EXT(ARB_gpu_shader5),
 613    EXT(ARB_gpu_shader_fp64),
 614    EXT(ARB_gpu_shader_int64),
 615    EXT(ARB_post_depth_coverage),
 616    EXT(ARB_sample_shading),
 617    EXT(ARB_separate_shader_objects),
 618    EXT(ARB_shader_atomic_counter_ops),
 619    EXT(ARB_shader_atomic_counters),
 620    EXT(ARB_shader_bit_encoding),
 621    EXT(ARB_shader_clock),
 622    EXT(ARB_shader_draw_parameters),
 623    EXT(ARB_shader_group_vote),
 624    EXT(ARB_shader_image_load_store),
 625    EXT(ARB_shader_image_size),
 626    EXT(ARB_shader_precision),
 627    EXT(ARB_shader_stencil_export),
 628    EXT(ARB_shader_storage_buffer_object),
 629    EXT(ARB_shader_subroutine),
 630    EXT(ARB_shader_texture_image_samples),
 631    EXT(ARB_shader_texture_lod),
 632    EXT(ARB_shader_viewport_layer_array),
 633    EXT(ARB_shading_language_420pack),
 634    EXT(ARB_shading_language_packing),
 635    EXT(ARB_tessellation_shader),
 636    EXT(ARB_texture_cube_map_array),
 637    EXT(ARB_texture_gather),
 638    EXT(ARB_texture_multisample),
 639    EXT(ARB_texture_query_levels),
 640    EXT(ARB_texture_query_lod),
 641    EXT(ARB_texture_rectangle),
 642    EXT(ARB_uniform_buffer_object),
 643    EXT(ARB_vertex_attrib_64bit),
 644    EXT(ARB_viewport_array),
 645
 646    /* KHR extensions go here, sorted alphabetically.
 647     */
 648    EXT_AEP(KHR_blend_equation_advanced),
 649
 650    /* OES extensions go here, sorted alphabetically.
 651     */
 652    EXT(OES_EGL_image_external),
 653    EXT(OES_geometry_point_size),
 654    EXT(OES_geometry_shader),
 655    EXT(OES_gpu_shader5),
 656    EXT(OES_primitive_bounding_box),
 657    EXT_AEP(OES_sample_variables),
 658    EXT_AEP(OES_shader_image_atomic),
 659    EXT(OES_shader_io_blocks),
 660    EXT_AEP(OES_shader_multisample_interpolation),
 661    EXT(OES_standard_derivatives),
 662    EXT(OES_tessellation_point_size),
 663    EXT(OES_tessellation_shader),
 664    EXT(OES_texture_3D),
 665    EXT(OES_texture_buffer),
 666    EXT(OES_texture_cube_map_array),
 667    EXT_AEP(OES_texture_storage_multisample_2d_array),
 668    EXT(OES_viewport_array),
 669
 670    /* All other extensions go here, sorted alphabetically.
 671     */
 672    EXT(AMD_conservative_depth),
 673    EXT(AMD_shader_stencil_export),
 674    EXT(AMD_shader_trinary_minmax),
 675    EXT(AMD_vertex_shader_layer),
 676    EXT(AMD_vertex_shader_viewport_index),
 677    EXT(ANDROID_extension_pack_es31a),
 678    EXT(EXT_blend_func_extended),
 679    EXT(EXT_draw_buffers),
 680    EXT(EXT_clip_cull_distance),
 681    EXT(EXT_geometry_point_size),
 682    EXT_AEP(EXT_geometry_shader),
 683    EXT_AEP(EXT_gpu_shader5),
 684    EXT_AEP(EXT_primitive_bounding_box),
 685    EXT(EXT_separate_shader_objects),
 686    EXT(EXT_shader_framebuffer_fetch),
 687    EXT(EXT_shader_integer_mix),
 688    EXT_AEP(EXT_shader_io_blocks),
 689    EXT(EXT_shader_samples_identical),
 690    EXT(EXT_tessellation_point_size),
 691    EXT_AEP(EXT_tessellation_shader),
 692    EXT(EXT_texture_array),
 693    EXT_AEP(EXT_texture_buffer),
 694    EXT_AEP(EXT_texture_cube_map_array),
 695    EXT(INTEL_conservative_rasterization),
 696    EXT(MESA_shader_integer_functions),
 697    EXT(NV_image_formats),
 698 };
 699
 700 #undef EXT
 701
 702
 703 /**
 704  * Determine whether a given extension is compatible with the target,
 705  * API, and extension information in the current parser state.
 706  */
 707 bool _mesa_glsl_extension::compatible_with_state(
 708       const _mesa_glsl_parse_state *state, gl_api api, uint8_t gl_version) const
 709 {
 710    return this->available_pred(state->ctx, api, gl_version);
 711 }
 712
 713 /**
 714  * Set the appropriate flags in the parser state to establish the
 715  * given behavior for this extension.
 716  */
 717 void _mesa_glsl_extension::set_flags(_mesa_glsl_parse_state *state,
 718                                      ext_behavior behavior) const
 719 {
 720    /* Note: the ->* operator indexes into state by the
 721     * offsets this->enable_flag and this->warn_flag.  See
 722     * _mesa_glsl_extension::supported_flag for more info.
 723     */
 724    state->*(this->enable_flag) = (behavior != extension_disable);
 725    state->*(this->warn_flag)   = (behavior == extension_warn);
 726 }
 727
 728 /**
 729  * Find an extension by name in _mesa_glsl_supported_extensions.  If
 730  * the name is not found, return NULL.
 731  */
 732 static const _mesa_glsl_extension *find_extension(const char *name)
 733 {
 734    for (unsigned i = 0; i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
 735       if (strcmp(name, _mesa_glsl_supported_extensions[i].name) == 0) {
 736          return &_mesa_glsl_supported_extensions[i];
 737       }
 738    }
 739    return NULL;
 740 }
 741
 742 bool
 743 _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
 744                              const char *behavior_string, YYLTYPE *behavior_locp,
 745                              _mesa_glsl_parse_state *state)
 746 {
 747    uint8_t gl_version = state->ctx->Extensions.Version;
 748    gl_api api = state->ctx->API;
 749    ext_behavior behavior;
 750    if (strcmp(behavior_string, "warn") == 0) {
 751       behavior = extension_warn;
 752    } else if (strcmp(behavior_string, "require") == 0) {
 753       behavior = extension_require;
 754    } else if (strcmp(behavior_string, "enable") == 0) {
 755       behavior = extension_enable;
 756    } else if (strcmp(behavior_string, "disable") == 0) {
 757       behavior = extension_disable;
 758    } else {
 759       _mesa_glsl_error(behavior_locp, state,
 760                        "unknown extension behavior `%s'",
 761                        behavior_string);
 762       return false;
 763    }
 764
 765    /* If we're in a desktop context but with an ES shader, use an ES API enum
 766     * to verify extension availability.
 767     */
 768    if (state->es_shader && api != API_OPENGLES2)
 769       api = API_OPENGLES2;
 770    /* Use the language-version derived GL version to extension checks, unless
 771     * we're using meta, which sets the version to the max.
 772     */
 773    if (gl_version != 0xff)
 774       gl_version = state->gl_version;
 775
 776    if (strcmp(name, "all") == 0) {
 777       if ((behavior == extension_enable) || (behavior == extension_require)) {
 778          _mesa_glsl_error(name_locp, state, "cannot %s all extensions",
 779                           (behavior == extension_enable)
 780                           ? "enable" : "require");
 781          return false;
 782       } else {
 783          for (unsigned i = 0;
 784               i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
 785             const _mesa_glsl_extension *extension
 786                = &_mesa_glsl_supported_extensions[i];
 787             if (extension->compatible_with_state(state, api, gl_version)) {
 788                _mesa_glsl_supported_extensions[i].set_flags(state, behavior);
 789             }
 790          }
 791       }
 792    } else {
 793       const _mesa_glsl_extension *extension = find_extension(name);
 794       if (extension && extension->compatible_with_state(state, api, gl_version)) {
 795          extension->set_flags(state, behavior);
 796          if (extension->available_pred == has_ANDROID_extension_pack_es31a) {
 797             for (unsigned i = 0;
 798                  i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
 799                const _mesa_glsl_extension *extension =
 800                   &_mesa_glsl_supported_extensions[i];
 801
 802                if (!extension->aep)
 803                   continue;
 804                /* AEP should not be enabled if all of the sub-extensions can't
 805                 * also be enabled. This is not the proper layer to do such
 806                 * error-checking though.
 807                 */
 808                assert(extension->compatible_with_state(state, api, gl_version));
 809                extension->set_flags(state, behavior);
 810             }
 811          }
 812       } else {
 813          static const char fmt[] = "extension `%s' unsupported in %s shader";
 814
 815          if (behavior == extension_require) {
 816             _mesa_glsl_error(name_locp, state, fmt,
 817                              name, _mesa_shader_stage_to_string(state->stage));
 818             return false;
 819          } else {
 820             _mesa_glsl_warning(name_locp, state, fmt,
 821                                name, _mesa_shader_stage_to_string(state->stage));
 822          }
 823       }
 824    }
 825
 826    return true;
 827 }
 828
 829
 830 /**
 831  * Recurses through <type> and <expr> if <expr> is an aggregate initializer
 832  * and sets <expr>'s <constructor_type> field to <type>. Gives later functions
 833  * (process_array_constructor, et al) sufficient information to do type
 834  * checking.
 835  *
 836  * Operates on assignments involving an aggregate initializer. E.g.,
 837  *
 838  * vec4 pos = {1.0, -1.0, 0.0, 1.0};
 839  *
 840  * or more ridiculously,
 841  *
 842  * struct S {
 843  *     vec4 v[2];
 844  * };
 845  *
 846  * struct {
 847  *     S a[2], b;
 848  *     int c;
 849  * } aggregate = {
 850  *     {
 851  *         {
 852  *             {
 853  *                 {1.0, 2.0, 3.0, 4.0}, // a[0].v[0]
 854  *                 {5.0, 6.0, 7.0, 8.0}  // a[0].v[1]
 855  *             } // a[0].v
 856  *         }, // a[0]
 857  *         {
 858  *             {
 859  *                 {1.0, 2.0, 3.0, 4.0}, // a[1].v[0]
 860  *                 {5.0, 6.0, 7.0, 8.0}  // a[1].v[1]
 861  *             } // a[1].v
 862  *         } // a[1]
 863  *     }, // a
 864  *     {
 865  *         {
 866  *             {1.0, 2.0, 3.0, 4.0}, // b.v[0]
 867  *             {5.0, 6.0, 7.0, 8.0}  // b.v[1]
 868  *         } // b.v
 869  *     }, // b
 870  *     4 // c
 871  * };
 872  *
 873  * This pass is necessary because the right-hand side of <type> e = { ... }
 874  * doesn't contain sufficient information to determine if the types match.
 875  */
 876 void
 877 _mesa_ast_set_aggregate_type(const glsl_type *type,
 878                              ast_expression *expr)
 879 {
 880    ast_aggregate_initializer *ai = (ast_aggregate_initializer *)expr;
 881    ai->constructor_type = type;
 882
 883    /* If the aggregate is an array, recursively set its elements' types. */
 884    if (type->is_array()) {
 885       /* Each array element has the type type->fields.array.
 886        *
 887        * E.g., if <type> if struct S[2] we want to set each element's type to
 888        * struct S.
 889        */
 890       for (exec_node *expr_node = ai->expressions.get_head_raw();
 891            !expr_node->is_tail_sentinel();
 892            expr_node = expr_node->next) {
 893          ast_expression *expr = exec_node_data(ast_expression, expr_node,
 894                                                link);
 895
 896          if (expr->oper == ast_aggregate)
 897             _mesa_ast_set_aggregate_type(type->fields.array, expr);
 898       }
 899
 900    /* If the aggregate is a struct, recursively set its fields' types. */
 901    } else if (type->is_record()) {
 902       exec_node *expr_node = ai->expressions.get_head_raw();
 903
 904       /* Iterate through the struct's fields. */
 905       for (unsigned i = 0; !expr_node->is_tail_sentinel() && i < type->length;
 906            i++, expr_node = expr_node->next) {
 907          ast_expression *expr = exec_node_data(ast_expression, expr_node,
 908                                                link);
 909
 910          if (expr->oper == ast_aggregate) {
 911             _mesa_ast_set_aggregate_type(type->fields.structure[i].type, expr);
 912          }
 913       }
 914    /* If the aggregate is a matrix, set its columns' types. */
 915    } else if (type->is_matrix()) {
 916       for (exec_node *expr_node = ai->expressions.get_head_raw();
 917            !expr_node->is_tail_sentinel();
 918            expr_node = expr_node->next) {
 919          ast_expression *expr = exec_node_data(ast_expression, expr_node,
 920                                                link);
 921
 922          if (expr->oper == ast_aggregate)
 923             _mesa_ast_set_aggregate_type(type->column_type(), expr);
 924       }
 925    }
 926 }
 927
 928 void
 929 _mesa_ast_process_interface_block(YYLTYPE *locp,
 930                                   _mesa_glsl_parse_state *state,
 931                                   ast_interface_block *const block,
 932                                   const struct ast_type_qualifier &q)
 933 {
 934    if (q.flags.q.buffer) {
 935       if (!state->has_shader_storage_buffer_objects()) {
 936          _mesa_glsl_error(locp, state,
 937                           "#version 430 / GL_ARB_shader_storage_buffer_object "
 938                           "required for defining shader storage blocks");
 939       } else if (state->ARB_shader_storage_buffer_object_warn) {
 940          _mesa_glsl_warning(locp, state,
 941                             "#version 430 / GL_ARB_shader_storage_buffer_object "
 942                             "required for defining shader storage blocks");
 943       }
 944    } else if (q.flags.q.uniform) {
 945       if (!state->has_uniform_buffer_objects()) {
 946          _mesa_glsl_error(locp, state,
 947                           "#version 140 / GL_ARB_uniform_buffer_object "
 948                           "required for defining uniform blocks");
 949       } else if (state->ARB_uniform_buffer_object_warn) {
 950          _mesa_glsl_warning(locp, state,
 951                             "#version 140 / GL_ARB_uniform_buffer_object "
 952                             "required for defining uniform blocks");
 953       }
 954    } else {
 955       if (!state->has_shader_io_blocks()) {
 956          if (state->es_shader) {
 957             _mesa_glsl_error(locp, state,
 958                              "GL_OES_shader_io_blocks or #version 320 "
 959                              "required for using interface blocks");
 960          } else {
 961             _mesa_glsl_error(locp, state,
 962                              "#version 150 required for using "
 963                              "interface blocks");
 964          }
 965       }
 966    }
 967
 968    /* From the GLSL 1.50.11 spec, section 4.3.7 ("Interface Blocks"):
 969     * "It is illegal to have an input block in a vertex shader
 970     *  or an output block in a fragment shader"
 971     */
 972    if ((state->stage == MESA_SHADER_VERTEX) && q.flags.q.in) {
 973       _mesa_glsl_error(locp, state,
 974                        "`in' interface block is not allowed for "
 975                        "a vertex shader");
 976    } else if ((state->stage == MESA_SHADER_FRAGMENT) && q.flags.q.out) {
 977       _mesa_glsl_error(locp, state,
 978                        "`out' interface block is not allowed for "
 979                        "a fragment shader");
 980    }
 981
 982    /* Since block arrays require names, and both features are added in
 983     * the same language versions, we don't have to explicitly
 984     * version-check both things.
 985     */
 986    if (block->instance_name != NULL) {
 987       state->check_version(150, 300, locp, "interface blocks with "
 988                            "an instance name are not allowed");
 989    }
 990
 991    uint64_t interface_type_mask;
 992    struct ast_type_qualifier temp_type_qualifier;
 993
 994    /* Get a bitmask containing only the in/out/uniform/buffer
 995     * flags, allowing us to ignore other irrelevant flags like
 996     * interpolation qualifiers.
 997     */
 998    temp_type_qualifier.flags.i = 0;
 999    temp_type_qualifier.flags.q.uniform = true;
1000    temp_type_qualifier.flags.q.in = true;
1001    temp_type_qualifier.flags.q.out = true;
1002    temp_type_qualifier.flags.q.buffer = true;
1003    temp_type_qualifier.flags.q.patch = true;
1004    interface_type_mask = temp_type_qualifier.flags.i;
1005
1006    /* Get the block's interface qualifier.  The interface_qualifier
1007     * production rule guarantees that only one bit will be set (and
1008     * it will be in/out/uniform).
1009     */
1010    uint64_t block_interface_qualifier = q.flags.i;
1011
1012    block->default_layout.flags.i |= block_interface_qualifier;
1013
1014    if (state->stage == MESA_SHADER_GEOMETRY &&
1015        state->has_explicit_attrib_stream() &&
1016        block->default_layout.flags.q.out) {
1017       /* Assign global layout's stream value. */
1018       block->default_layout.flags.q.stream = 1;
1019       block->default_layout.flags.q.explicit_stream = 0;
1020       block->default_layout.stream = state->out_qualifier->stream;
1021    }
1022
1023    if (state->has_enhanced_layouts() && block->default_layout.flags.q.out) {
1024       /* Assign global layout's xfb_buffer value. */
1025       block->default_layout.flags.q.xfb_buffer = 1;
1026       block->default_layout.flags.q.explicit_xfb_buffer = 0;
1027       block->default_layout.xfb_buffer = state->out_qualifier->xfb_buffer;
1028    }
1029
1030    foreach_list_typed (ast_declarator_list, member, link, &block->declarations) {
1031       ast_type_qualifier& qualifier = member->type->qualifier;
1032       if ((qualifier.flags.i & interface_type_mask) == 0) {
1033          /* GLSLangSpec.1.50.11, 4.3.7 (Interface Blocks):
1034           * "If no optional qualifier is used in a member declaration, the
1035           *  qualifier of the variable is just in, out, or uniform as declared
1036           *  by interface-qualifier."
1037           */
1038          qualifier.flags.i |= block_interface_qualifier;
1039       } else if ((qualifier.flags.i & interface_type_mask) !=
1040                  block_interface_qualifier) {
1041          /* GLSLangSpec.1.50.11, 4.3.7 (Interface Blocks):
1042           * "If optional qualifiers are used, they can include interpolation
1043           *  and storage qualifiers and they must declare an input, output,
1044           *  or uniform variable consistent with the interface qualifier of
1045           *  the block."
1046           */
1047          _mesa_glsl_error(locp, state,
1048                           "uniform/in/out qualifier on "
1049                           "interface block member does not match "
1050                           "the interface block");
1051       }
1052
1053       if (!(q.flags.q.in || q.flags.q.out) && qualifier.flags.q.invariant)
1054          _mesa_glsl_error(locp, state,
1055                           "invariant qualifiers can be used only "
1056                           "in interface block members for shader "
1057                           "inputs or outputs");
1058    }
1059 }
1060
1061 void
1062 _mesa_ast_type_qualifier_print(const struct ast_type_qualifier *q)
1063 {
1064    if (q->flags.q.subroutine)
1065       printf("subroutine ");
1066
1067    if (q->flags.q.subroutine_def) {
1068       printf("subroutine (");
1069       q->subroutine_list->print();
1070       printf(")");
1071    }
1072
1073    if (q->flags.q.constant)
1074       printf("const ");
1075
1076    if (q->flags.q.invariant)
1077       printf("invariant ");
1078
1079    if (q->flags.q.attribute)
1080       printf("attribute ");
1081
1082    if (q->flags.q.varying)
1083       printf("varying ");
1084
1085    if (q->flags.q.in && q->flags.q.out)
1086       printf("inout ");
1087    else {
1088       if (q->flags.q.in)
1089          printf("in ");
1090
1091       if (q->flags.q.out)
1092          printf("out ");
1093    }
1094
1095    if (q->flags.q.centroid)
1096       printf("centroid ");
1097    if (q->flags.q.sample)
1098       printf("sample ");
1099    if (q->flags.q.patch)
1100       printf("patch ");
1101    if (q->flags.q.uniform)
1102       printf("uniform ");
1103    if (q->flags.q.buffer)
1104       printf("buffer ");
1105    if (q->flags.q.smooth)
1106       printf("smooth ");
1107    if (q->flags.q.flat)
1108       printf("flat ");
1109    if (q->flags.q.noperspective)
1110       printf("noperspective ");
1111 }
1112
1113
1114 void
1115 ast_node::print(void) const
1116 {
1117    printf("unhandled node ");
1118 }
1119
1120
1121 ast_node::ast_node(void)
1122 {
1123    this->location.source = 0;
1124    this->location.first_line = 0;
1125    this->location.first_column = 0;
1126    this->location.last_line = 0;
1127    this->location.last_column = 0;
1128 }
1129
1130
1131 static void
1132 ast_opt_array_dimensions_print(const ast_array_specifier *array_specifier)
1133 {
1134    if (array_specifier)
1135       array_specifier->print();
1136 }
1137
1138
1139 void
1140 ast_compound_statement::print(void) const
1141 {
1142    printf("{\n");
1143
1144    foreach_list_typed(ast_node, ast, link, &this->statements) {
1145       ast->print();
1146    }
1147
1148    printf("}\n");
1149 }
1150
1151
1152 ast_compound_statement::ast_compound_statement(int new_scope,
1153                                                ast_node *statements)
1154 {
1155    this->new_scope = new_scope;
1156
1157    if (statements != NULL) {
1158       this->statements.push_degenerate_list_at_head(&statements->link);
1159    }
1160 }
1161
1162
1163 void
1164 ast_expression::print(void) const
1165 {
1166    switch (oper) {
1167    case ast_assign:
1168    case ast_mul_assign:
1169    case ast_div_assign:
1170    case ast_mod_assign:
1171    case ast_add_assign:
1172    case ast_sub_assign:
1173    case ast_ls_assign:
1174    case ast_rs_assign:
1175    case ast_and_assign:
1176    case ast_xor_assign:
1177    case ast_or_assign:
1178       subexpressions[0]->print();
1179       printf("%s ", operator_string(oper));
1180       subexpressions[1]->print();
1181       break;
1182
1183    case ast_field_selection:
1184       subexpressions[0]->print();
1185       printf(". %s ", primary_expression.identifier);
1186       break;
1187
1188    case ast_plus:
1189    case ast_neg:
1190    case ast_bit_not:
1191    case ast_logic_not:
1192    case ast_pre_inc:
1193    case ast_pre_dec:
1194       printf("%s ", operator_string(oper));
1195       subexpressions[0]->print();
1196       break;
1197
1198    case ast_post_inc:
1199    case ast_post_dec:
1200       subexpressions[0]->print();
1201       printf("%s ", operator_string(oper));
1202       break;
1203
1204    case ast_conditional:
1205       subexpressions[0]->print();
1206       printf("? ");
1207       subexpressions[1]->print();
1208       printf(": ");
1209       subexpressions[2]->print();
1210       break;
1211
1212    case ast_array_index:
1213       subexpressions[0]->print();
1214       printf("[ ");
1215       subexpressions[1]->print();
1216       printf("] ");
1217       break;
1218
1219    case ast_function_call: {
1220       subexpressions[0]->print();
1221       printf("( ");
1222
1223       foreach_list_typed (ast_node, ast, link, &this->expressions) {
1224          if (&ast->link != this->expressions.get_head())
1225             printf(", ");
1226
1227          ast->print();
1228       }
1229
1230       printf(") ");
1231       break;
1232    }
1233
1234    case ast_identifier:
1235       printf("%s ", primary_expression.identifier);
1236       break;
1237
1238    case ast_int_constant:
1239       printf("%d ", primary_expression.int_constant);
1240       break;
1241
1242    case ast_uint_constant:
1243       printf("%u ", primary_expression.uint_constant);
1244       break;
1245
1246    case ast_float_constant:
1247       printf("%f ", primary_expression.float_constant);
1248       break;
1249
1250    case ast_double_constant:
1251       printf("%f ", primary_expression.double_constant);
1252       break;
1253
1254    case ast_int64_constant:
1255       printf("%" PRId64 " ", primary_expression.int64_constant);
1256       break;
1257
1258    case ast_uint64_constant:
1259       printf("%" PRIu64 " ", primary_expression.uint64_constant);
1260       break;
1261
1262    case ast_bool_constant:
1263       printf("%s ",
1264              primary_expression.bool_constant
1265              ? "true" : "false");
1266       break;
1267
1268    case ast_sequence: {
1269       printf("( ");
1270       foreach_list_typed (ast_node, ast, link, & this->expressions) {
1271          if (&ast->link != this->expressions.get_head())
1272             printf(", ");
1273
1274          ast->print();
1275       }
1276       printf(") ");
1277       break;
1278    }
1279
1280    case ast_aggregate: {
1281       printf("{ ");
1282       foreach_list_typed (ast_node, ast, link, & this->expressions) {
1283          if (&ast->link != this->expressions.get_head())
1284             printf(", ");
1285
1286          ast->print();
1287       }
1288       printf("} ");
1289       break;
1290    }
1291
1292    default:
1293       assert(0);
1294       break;
1295    }
1296 }
1297
1298 ast_expression::ast_expression(int oper,
1299                                ast_expression *ex0,
1300                                ast_expression *ex1,
1301                                ast_expression *ex2) :
1302    primary_expression()
1303 {
1304    this->oper = ast_operators(oper);
1305    this->subexpressions[0] = ex0;
1306    this->subexpressions[1] = ex1;
1307    this->subexpressions[2] = ex2;
1308    this->non_lvalue_description = NULL;
1309    this->is_lhs = false;
1310 }
1311
1312
1313 void
1314 ast_expression_statement::print(void) const
1315 {
1316    if (expression)
1317       expression->print();
1318
1319    printf("; ");
1320 }
1321
1322
1323 ast_expression_statement::ast_expression_statement(ast_expression *ex) :
1324    expression(ex)
1325 {
1326    /* empty */
1327 }
1328
1329
1330 void
1331 ast_function::print(void) const
1332 {
1333    return_type->print();
1334    printf(" %s (", identifier);
1335
1336    foreach_list_typed(ast_node, ast, link, & this->parameters) {
1337       ast->print();
1338    }
1339
1340    printf(")");
1341 }
1342
1343
1344 ast_function::ast_function(void)
1345    : return_type(NULL), identifier(NULL), is_definition(false),
1346      signature(NULL)
1347 {
1348    /* empty */
1349 }
1350
1351
1352 void
1353 ast_fully_specified_type::print(void) const
1354 {
1355    _mesa_ast_type_qualifier_print(& qualifier);
1356    specifier->print();
1357 }
1358
1359
1360 void
1361 ast_parameter_declarator::print(void) const
1362 {
1363    type->print();
1364    if (identifier)
1365       printf("%s ", identifier);
1366    ast_opt_array_dimensions_print(array_specifier);
1367 }
1368
1369
1370 void
1371 ast_function_definition::print(void) const
1372 {
1373    prototype->print();
1374    body->print();
1375 }
1376
1377
1378 void
1379 ast_declaration::print(void) const
1380 {
1381    printf("%s ", identifier);
1382    ast_opt_array_dimensions_print(array_specifier);
1383
1384    if (initializer) {
1385       printf("= ");
1386       initializer->print();
1387    }
1388 }
1389
1390
1391 ast_declaration::ast_declaration(const char *identifier,
1392                                  ast_array_specifier *array_specifier,
1393                                  ast_expression *initializer)
1394 {
1395    this->identifier = identifier;
1396    this->array_specifier = array_specifier;
1397    this->initializer = initializer;
1398 }
1399
1400
1401 void
1402 ast_declarator_list::print(void) const
1403 {
1404    assert(type || invariant);
1405
1406    if (type)
1407       type->print();
1408    else if (invariant)
1409       printf("invariant ");
1410    else
1411       printf("precise ");
1412
1413    foreach_list_typed (ast_node, ast, link, & this->declarations) {
1414       if (&ast->link != this->declarations.get_head())
1415          printf(", ");
1416
1417       ast->print();
1418    }
1419
1420    printf("; ");
1421 }
1422
1423
1424 ast_declarator_list::ast_declarator_list(ast_fully_specified_type *type)
1425 {
1426    this->type = type;
1427    this->invariant = false;
1428    this->precise = false;
1429 }
1430
1431 void
1432 ast_jump_statement::print(void) const
1433 {
1434    switch (mode) {
1435    case ast_continue:
1436       printf("continue; ");
1437       break;
1438    case ast_break:
1439       printf("break; ");
1440       break;
1441    case ast_return:
1442       printf("return ");
1443       if (opt_return_value)
1444          opt_return_value->print();
1445
1446       printf("; ");
1447       break;
1448    case ast_discard:
1449       printf("discard; ");
1450       break;
1451    }
1452 }
1453
1454
1455 ast_jump_statement::ast_jump_statement(int mode, ast_expression *return_value)
1456    : opt_return_value(NULL)
1457 {
1458    this->mode = ast_jump_modes(mode);
1459
1460    if (mode == ast_return)
1461       opt_return_value = return_value;
1462 }
1463
1464
1465 void
1466 ast_selection_statement::print(void) const
1467 {
1468    printf("if ( ");
1469    condition->print();
1470    printf(") ");
1471
1472    then_statement->print();
1473
1474    if (else_statement) {
1475       printf("else ");
1476       else_statement->print();
1477    }
1478 }
1479
1480
1481 ast_selection_statement::ast_selection_statement(ast_expression *condition,
1482                                                  ast_node *then_statement,
1483                                                  ast_node *else_statement)
1484 {
1485    this->condition = condition;
1486    this->then_statement = then_statement;
1487    this->else_statement = else_statement;
1488 }
1489
1490
1491 void
1492 ast_switch_statement::print(void) const
1493 {
1494    printf("switch ( ");
1495    test_expression->print();
1496    printf(") ");
1497
1498    body->print();
1499 }
1500
1501
1502 ast_switch_statement::ast_switch_statement(ast_expression *test_expression,
1503                                            ast_node *body)
1504 {
1505    this->test_expression = test_expression;
1506    this->body = body;
1507 }
1508
1509
1510 void
1511 ast_switch_body::print(void) const
1512 {
1513    printf("{\n");
1514    if (stmts != NULL) {
1515       stmts->print();
1516    }
1517    printf("}\n");
1518 }
1519
1520
1521 ast_switch_body::ast_switch_body(ast_case_statement_list *stmts)
1522 {
1523    this->stmts = stmts;
1524 }
1525
1526
1527 void ast_case_label::print(void) const
1528 {
1529    if (test_value != NULL) {
1530       printf("case ");
1531       test_value->print();
1532       printf(": ");
1533    } else {
1534       printf("default: ");
1535    }
1536 }
1537
1538
1539 ast_case_label::ast_case_label(ast_expression *test_value)
1540 {
1541    this->test_value = test_value;
1542 }
1543
1544
1545 void ast_case_label_list::print(void) const
1546 {
1547    foreach_list_typed(ast_node, ast, link, & this->labels) {
1548       ast->print();
1549    }
1550    printf("\n");
1551 }
1552
1553
1554 ast_case_label_list::ast_case_label_list(void)
1555 {
1556 }
1557
1558
1559 void ast_case_statement::print(void) const
1560 {
1561    labels->print();
1562    foreach_list_typed(ast_node, ast, link, & this->stmts) {
1563       ast->print();
1564       printf("\n");
1565    }
1566 }
1567
1568
1569 ast_case_statement::ast_case_statement(ast_case_label_list *labels)
1570 {
1571    this->labels = labels;
1572 }
1573
1574
1575 void ast_case_statement_list::print(void) const
1576 {
1577    foreach_list_typed(ast_node, ast, link, & this->cases) {
1578       ast->print();
1579    }
1580 }
1581
1582
1583 ast_case_statement_list::ast_case_statement_list(void)
1584 {
1585 }
1586
1587
1588 void
1589 ast_iteration_statement::print(void) const
1590 {
1591    switch (mode) {
1592    case ast_for:
1593       printf("for( ");
1594       if (init_statement)
1595          init_statement->print();
1596       printf("; ");
1597
1598       if (condition)
1599          condition->print();
1600       printf("; ");
1601
1602       if (rest_expression)
1603          rest_expression->print();
1604       printf(") ");
1605
1606       body->print();
1607       break;
1608
1609    case ast_while:
1610       printf("while ( ");
1611       if (condition)
1612          condition->print();
1613       printf(") ");
1614       body->print();
1615       break;
1616
1617    case ast_do_while:
1618       printf("do ");
1619       body->print();
1620       printf("while ( ");
1621       if (condition)
1622          condition->print();
1623       printf("); ");
1624       break;
1625    }
1626 }
1627
1628
1629 ast_iteration_statement::ast_iteration_statement(int mode,
1630                                                  ast_node *init,
1631                                                  ast_node *condition,
1632                                                  ast_expression *rest_expression,
1633                                                  ast_node *body)
1634 {
1635    this->mode = ast_iteration_modes(mode);
1636    this->init_statement = init;
1637    this->condition = condition;
1638    this->rest_expression = rest_expression;
1639    this->body = body;
1640 }
1641
1642
1643 void
1644 ast_struct_specifier::print(void) const
1645 {
1646    printf("struct %s { ", name);
1647    foreach_list_typed(ast_node, ast, link, &this->declarations) {
1648       ast->print();
1649    }
1650    printf("} ");
1651 }
1652
1653
1654 ast_struct_specifier::ast_struct_specifier(void *lin_ctx, const char *identifier,
1655                                            ast_declarator_list *declarator_list)
1656 {
1657    if (identifier == NULL) {
1658       static mtx_t mutex = _MTX_INITIALIZER_NP;
1659       static unsigned anon_count = 1;
1660       unsigned count;
1661
1662       mtx_lock(&mutex);
1663       count = anon_count++;
1664       mtx_unlock(&mutex);
1665
1666       identifier = linear_asprintf(lin_ctx, "#anon_struct_%04x", count);
1667    }
1668    name = identifier;
1669    this->declarations.push_degenerate_list_at_head(&declarator_list->link);
1670    is_declaration = true;
1671    layout = NULL;
1672 }
1673
1674 void ast_subroutine_list::print(void) const
1675 {
1676    foreach_list_typed (ast_node, ast, link, & this->declarations) {
1677       if (&ast->link != this->declarations.get_head())
1678          printf(", ");
1679       ast->print();
1680    }
1681 }
1682
1683 static void
1684 set_shader_inout_layout(struct gl_shader *shader,
1685                      struct _mesa_glsl_parse_state *state)
1686 {
1687    /* Should have been prevented by the parser. */
1688    if (shader->Stage == MESA_SHADER_TESS_CTRL ||
1689        shader->Stage == MESA_SHADER_VERTEX) {
1690       assert(!state->in_qualifier->flags.i);
1691    } else if (shader->Stage != MESA_SHADER_GEOMETRY &&
1692               shader->Stage != MESA_SHADER_TESS_EVAL) {
1693       assert(!state->in_qualifier->flags.i);
1694    }
1695
1696    if (shader->Stage != MESA_SHADER_COMPUTE) {
1697       /* Should have been prevented by the parser. */
1698       assert(!state->cs_input_local_size_specified);
1699       assert(!state->cs_input_local_size_variable_specified);
1700    }
1701
1702    if (shader->Stage != MESA_SHADER_FRAGMENT) {
1703       /* Should have been prevented by the parser. */
1704       assert(!state->fs_uses_gl_fragcoord);
1705       assert(!state->fs_redeclares_gl_fragcoord);
1706       assert(!state->fs_pixel_center_integer);
1707       assert(!state->fs_origin_upper_left);
1708       assert(!state->fs_early_fragment_tests);
1709       assert(!state->fs_inner_coverage);
1710       assert(!state->fs_post_depth_coverage);
1711    }
1712
1713    for (unsigned i = 0; i < MAX_FEEDBACK_BUFFERS; i++) {
1714       if (state->out_qualifier->out_xfb_stride[i]) {
1715          unsigned xfb_stride;
1716          if (state->out_qualifier->out_xfb_stride[i]->
1717                 process_qualifier_constant(state, "xfb_stride", &xfb_stride,
1718                 true)) {
1719             shader->TransformFeedbackBufferStride[i] = xfb_stride;
1720          }
1721       }
1722    }
1723
1724    switch (shader->Stage) {
1725    case MESA_SHADER_TESS_CTRL:
1726       shader->info.TessCtrl.VerticesOut = 0;
1727       if (state->tcs_output_vertices_specified) {
1728          unsigned vertices;
1729          if (state->out_qualifier->vertices->
1730                process_qualifier_constant(state, "vertices", &vertices,
1731                                           false)) {
1732
1733             YYLTYPE loc = state->out_qualifier->vertices->get_location();
1734             if (vertices > state->Const.MaxPatchVertices) {
1735                _mesa_glsl_error(&loc, state, "vertices (%d) exceeds "
1736                                 "GL_MAX_PATCH_VERTICES", vertices);
1737             }
1738             shader->info.TessCtrl.VerticesOut = vertices;
1739          }
1740       }
1741       break;
1742    case MESA_SHADER_TESS_EVAL:
1743       shader->info.TessEval.PrimitiveMode = PRIM_UNKNOWN;
1744       if (state->in_qualifier->flags.q.prim_type)
1745          shader->info.TessEval.PrimitiveMode = state->in_qualifier->prim_type;
1746
1747       shader->info.TessEval.Spacing = TESS_SPACING_UNSPECIFIED;
1748       if (state->in_qualifier->flags.q.vertex_spacing)
1749          shader->info.TessEval.Spacing = state->in_qualifier->vertex_spacing;
1750
1751       shader->info.TessEval.VertexOrder = 0;
1752       if (state->in_qualifier->flags.q.ordering)
1753          shader->info.TessEval.VertexOrder = state->in_qualifier->ordering;
1754
1755       shader->info.TessEval.PointMode = -1;
1756       if (state->in_qualifier->flags.q.point_mode)
1757          shader->info.TessEval.PointMode = state->in_qualifier->point_mode;
1758       break;
1759    case MESA_SHADER_GEOMETRY:
1760       shader->info.Geom.VerticesOut = -1;
1761       if (state->out_qualifier->flags.q.max_vertices) {
1762          unsigned qual_max_vertices;
1763          if (state->out_qualifier->max_vertices->
1764                process_qualifier_constant(state, "max_vertices",
1765                                           &qual_max_vertices, true)) {
1766
1767             if (qual_max_vertices > state->Const.MaxGeometryOutputVertices) {
1768                YYLTYPE loc = state->out_qualifier->max_vertices->get_location();
1769                _mesa_glsl_error(&loc, state,
1770                                 "maximum output vertices (%d) exceeds "
1771                                 "GL_MAX_GEOMETRY_OUTPUT_VERTICES",
1772                                 qual_max_vertices);
1773             }
1774             shader->info.Geom.VerticesOut = qual_max_vertices;
1775          }
1776       }
1777
1778       if (state->gs_input_prim_type_specified) {
1779          shader->info.Geom.InputType = state->in_qualifier->prim_type;
1780       } else {
1781          shader->info.Geom.InputType = PRIM_UNKNOWN;
1782       }
1783
1784       if (state->out_qualifier->flags.q.prim_type) {
1785          shader->info.Geom.OutputType = state->out_qualifier->prim_type;
1786       } else {
1787          shader->info.Geom.OutputType = PRIM_UNKNOWN;
1788       }
1789
1790       shader->info.Geom.Invocations = 0;
1791       if (state->in_qualifier->flags.q.invocations) {
1792          unsigned invocations;
1793          if (state->in_qualifier->invocations->
1794                process_qualifier_constant(state, "invocations",
1795                                           &invocations, false)) {
1796
1797             YYLTYPE loc = state->in_qualifier->invocations->get_location();
1798             if (invocations > MAX_GEOMETRY_SHADER_INVOCATIONS) {
1799                _mesa_glsl_error(&loc, state,
1800                                 "invocations (%d) exceeds "
1801                                 "GL_MAX_GEOMETRY_SHADER_INVOCATIONS",
1802                                 invocations);
1803             }
1804             shader->info.Geom.Invocations = invocations;
1805          }
1806       }
1807       break;
1808
1809    case MESA_SHADER_COMPUTE:
1810       if (state->cs_input_local_size_specified) {
1811          for (int i = 0; i < 3; i++)
1812             shader->info.Comp.LocalSize[i] = state->cs_input_local_size[i];
1813       } else {
1814          for (int i = 0; i < 3; i++)
1815             shader->info.Comp.LocalSize[i] = 0;
1816       }
1817
1818       shader->info.Comp.LocalSizeVariable =
1819          state->cs_input_local_size_variable_specified;
1820       break;
1821
1822    case MESA_SHADER_FRAGMENT:
1823       shader->redeclares_gl_fragcoord = state->fs_redeclares_gl_fragcoord;
1824       shader->uses_gl_fragcoord = state->fs_uses_gl_fragcoord;
1825       shader->pixel_center_integer = state->fs_pixel_center_integer;
1826       shader->origin_upper_left = state->fs_origin_upper_left;
1827       shader->ARB_fragment_coord_conventions_enable =
1828          state->ARB_fragment_coord_conventions_enable;
1829       shader->EarlyFragmentTests = state->fs_early_fragment_tests;
1830       shader->InnerCoverage = state->fs_inner_coverage;
1831       shader->PostDepthCoverage = state->fs_post_depth_coverage;
1832       shader->BlendSupport = state->fs_blend_support;
1833       break;
1834
1835    default:
1836       /* Nothing to do. */
1837       break;
1838    }
1839 }
1840
1841 extern "C" {
1842
1843 static void
1844 assign_subroutine_indexes(struct gl_shader *sh,
1845                           struct _mesa_glsl_parse_state *state)
1846 {
1847    int j, k;
1848    int index = 0;
1849
1850    for (j = 0; j < state->num_subroutines; j++) {
1851       while (state->subroutines[j]->subroutine_index == -1) {
1852          for (k = 0; k < state->num_subroutines; k++) {
1853             if (state->subroutines[k]->subroutine_index == index)
1854                break;
1855             else if (k == state->num_subroutines - 1) {
1856                state->subroutines[j]->subroutine_index = index;
1857             }
1858          }
1859          index++;
1860       }
1861    }
1862 }
1863
1864 static void
1865 add_builtin_defines(struct _mesa_glsl_parse_state *state,
1866                     void (*add_builtin_define)(struct glcpp_parser *, const char *, int),
1867                     struct glcpp_parser *data,
1868                     unsigned version,
1869                     bool es)
1870 {
1871    unsigned gl_version = state->ctx->Extensions.Version;
1872    gl_api api = state->ctx->API;
1873
1874    if (gl_version != 0xff) {
1875       unsigned i;
1876       for (i = 0; i < state->num_supported_versions; i++) {
1877          if (state->supported_versions[i].ver == version &&
1878              state->supported_versions[i].es == es) {
1879             gl_version = state->supported_versions[i].gl_ver;
1880             break;
1881          }
1882       }
1883
1884       if (i == state->num_supported_versions)
1885          return;
1886    }
1887
1888    if (es)
1889       api = API_OPENGLES2;
1890
1891    for (unsigned i = 0;
1892         i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
1893       const _mesa_glsl_extension *extension
1894          = &_mesa_glsl_supported_extensions[i];
1895       if (extension->compatible_with_state(state, api, gl_version)) {
1896          add_builtin_define(data, extension->name, 1);
1897       }
1898    }
1899 }
1900
1901 /* Implements parsing checks that we can't do during parsing */
1902 static void
1903 do_late_parsing_checks(struct _mesa_glsl_parse_state *state)
1904 {
1905    if (state->stage == MESA_SHADER_COMPUTE && !state->has_compute_shader()) {
1906       YYLTYPE loc;
1907       memset(&loc, 0, sizeof(loc));
1908       _mesa_glsl_error(&loc, state, "Compute shaders require "
1909                        "GLSL 4.30 or GLSL ES 3.10");
1910    }
1911 }
1912
1913 void
1914 _mesa_glsl_compile_shader(struct gl_context *ctx, struct gl_shader *shader,
1915                           bool dump_ast, bool dump_hir)
1916 {
1917    struct _mesa_glsl_parse_state *state =
1918       new(shader) _mesa_glsl_parse_state(ctx, shader->Stage, shader);
1919    const char *source = shader->Source;
1920
1921    if (ctx->Const.GenerateTemporaryNames)
1922       (void) p_atomic_cmpxchg(&ir_variable::temporaries_allocate_names,
1923                               false, true);
1924
1925    state->error = glcpp_preprocess(state, &source, &state->info_log,
1926                              add_builtin_defines, state, ctx);
1927
1928    if (!state->error) {
1929      _mesa_glsl_lexer_ctor(state, source);
1930      _mesa_glsl_parse(state);
1931      _mesa_glsl_lexer_dtor(state);
1932      do_late_parsing_checks(state);
1933    }
1934
1935    if (dump_ast) {
1936       foreach_list_typed(ast_node, ast, link, &state->translation_unit) {
1937          ast->print();
1938       }
1939       printf("\n\n");
1940    }
1941
1942    ralloc_free(shader->ir);
1943    shader->ir = new(shader) exec_list;
1944    if (!state->error && !state->translation_unit.is_empty())
1945       _mesa_ast_to_hir(shader->ir, state);
1946
1947    if (!state->error) {
1948       validate_ir_tree(shader->ir);
1949
1950       /* Print out the unoptimized IR. */
1951       if (dump_hir) {
1952          _mesa_print_ir(stdout, shader->ir, state);
1953       }
1954    }
1955
1956
1957    if (!state->error && !shader->ir->is_empty()) {
1958       struct gl_shader_compiler_options *options =
1959          &ctx->Const.ShaderCompilerOptions[shader->Stage];
1960
1961       assign_subroutine_indexes(shader, state);
1962       lower_subroutine(shader->ir, state);
1963
1964       /* Do some optimization at compile time to reduce shader IR size
1965        * and reduce later work if the same shader is linked multiple times
1966        */
1967       if (ctx->Const.GLSLOptimizeConservatively) {
1968          /* Run it just once. */
1969          do_common_optimization(shader->ir, false, false, options,
1970                                 ctx->Const.NativeIntegers);
1971       } else {
1972          /* Repeat it until it stops making changes. */
1973          while (do_common_optimization(shader->ir, false, false, options,
1974                                        ctx->Const.NativeIntegers))
1975             ;
1976       }
1977
1978       validate_ir_tree(shader->ir);
1979
1980       enum ir_variable_mode other;
1981       switch (shader->Stage) {
1982       case MESA_SHADER_VERTEX:
1983          other = ir_var_shader_in;
1984          break;
1985       case MESA_SHADER_FRAGMENT:
1986          other = ir_var_shader_out;
1987          break;
1988       default:
1989          /* Something invalid to ensure optimize_dead_builtin_uniforms
1990           * doesn't remove anything other than uniforms or constants.
1991           */
1992          other = ir_var_mode_count;
1993          break;
1994       }
1995
1996       optimize_dead_builtin_variables(shader->ir, other);
1997
1998       validate_ir_tree(shader->ir);
1999    }
2000
2001    if (shader->InfoLog)
2002       ralloc_free(shader->InfoLog);
2003
2004    if (!state->error)
2005       set_shader_inout_layout(shader, state);
2006
2007    shader->symbols = new(shader->ir) glsl_symbol_table;
2008    shader->CompileStatus = !state->error;
2009    shader->InfoLog = state->info_log;
2010    shader->Version = state->language_version;
2011    shader->IsES = state->es_shader;
2012
2013    /* Retain any live IR, but trash the rest. */
2014    reparent_ir(shader->ir, shader->ir);
2015
2016    /* Destroy the symbol table.  Create a new symbol table that contains only
2017     * the variables and functions that still exist in the IR.  The symbol
2018     * table will be used later during linking.
2019     *
2020     * There must NOT be any freed objects still referenced by the symbol
2021     * table.  That could cause the linker to dereference freed memory.
2022     *
2023     * We don't have to worry about types or interface-types here because those
2024     * are fly-weights that are looked up by glsl_type.
2025     */
2026    foreach_in_list (ir_instruction, ir, shader->ir) {
2027       switch (ir->ir_type) {
2028       case ir_type_function:
2029          shader->symbols->add_function((ir_function *) ir);
2030          break;
2031       case ir_type_variable: {
2032          ir_variable *const var = (ir_variable *) ir;
2033
2034          if (var->data.mode != ir_var_temporary)
2035             shader->symbols->add_variable(var);
2036          break;
2037       }
2038       default:
2039          break;
2040       }
2041    }
2042
2043    _mesa_glsl_initialize_derived_variables(ctx, shader);
2044
2045    delete state->symbols;
2046    ralloc_free(state);
2047 }
2048
2049 } /* extern "C" */
2050 /**
2051  * Do the set of common optimizations passes
2052  *
2053  * \param ir                          List of instructions to be optimized
2054  * \param linked                      Is the shader linked?  This enables
2055  *                                    optimizations passes that remove code at
2056  *                                    global scope and could cause linking to
2057  *                                    fail.
2058  * \param uniform_locations_assigned  Have locations already been assigned for
2059  *                                    uniforms?  This prevents the declarations
2060  *                                    of unused uniforms from being removed.
2061  *                                    The setting of this flag only matters if
2062  *                                    \c linked is \c true.
2063  * \param options                     The driver's preferred shader options.
2064  * \param native_integers             Selects optimizations that depend on the
2065  *                                    implementations supporting integers
2066  *                                    natively (as opposed to supporting
2067  *                                    integers in floating point registers).
2068  */
2069 bool
2070 do_common_optimization(exec_list *ir, bool linked,
2071                        bool uniform_locations_assigned,
2072                        const struct gl_shader_compiler_options *options,
2073                        bool native_integers)
2074 {
2075    const bool debug = false;
2076    GLboolean progress = GL_FALSE;
2077
2078 #define OPT(PASS, ...) do {                                             \
2079       if (debug) {                                                      \
2080          fprintf(stderr, "START GLSL optimization %s\n", #PASS);        \
2081          const bool opt_progress = PASS(__VA_ARGS__);                   \
2082          progress = opt_progress || progress;                           \
2083          if (opt_progress)                                              \
2084             _mesa_print_ir(stderr, ir, NULL);                           \
2085          fprintf(stderr, "GLSL optimization %s: %s progress\n",         \
2086                  #PASS, opt_progress ? "made" : "no");                  \
2087       } else {                                                          \
2088          progress = PASS(__VA_ARGS__) || progress;                      \
2089       }                                                                 \
2090    } while (false)
2091
2092    OPT(lower_instructions, ir, SUB_TO_ADD_NEG);
2093
2094    if (linked) {
2095       OPT(do_function_inlining, ir);
2096       OPT(do_dead_functions, ir);
2097       OPT(do_structure_splitting, ir);
2098    }
2099    propagate_invariance(ir);
2100    OPT(do_if_simplification, ir);
2101    OPT(opt_flatten_nested_if_blocks, ir);
2102    OPT(opt_conditional_discard, ir);
2103    OPT(do_copy_propagation, ir);
2104    OPT(do_copy_propagation_elements, ir);
2105
2106    if (options->OptimizeForAOS && !linked)
2107       OPT(opt_flip_matrices, ir);
2108
2109    if (linked && options->OptimizeForAOS) {
2110       OPT(do_vectorize, ir);
2111    }
2112
2113    if (linked)
2114       OPT(do_dead_code, ir, uniform_locations_assigned);
2115    else
2116       OPT(do_dead_code_unlinked, ir);
2117    OPT(do_dead_code_local, ir);
2118    OPT(do_tree_grafting, ir);
2119    OPT(do_constant_propagation, ir);
2120    if (linked)
2121       OPT(do_constant_variable, ir);
2122    else
2123       OPT(do_constant_variable_unlinked, ir);
2124    OPT(do_constant_folding, ir);
2125    OPT(do_minmax_prune, ir);
2126    OPT(do_rebalance_tree, ir);
2127    OPT(do_algebraic, ir, native_integers, options);
2128    OPT(do_lower_jumps, ir, true, true, options->EmitNoMainReturn,
2129        options->EmitNoCont, options->EmitNoLoops);
2130    OPT(do_vec_index_to_swizzle, ir);
2131    OPT(lower_vector_insert, ir, false);
2132    OPT(do_swizzle_swizzle, ir);
2133    OPT(do_noop_swizzle, ir);
2134
2135    OPT(optimize_split_arrays, ir, linked);
2136    OPT(optimize_redundant_jumps, ir);
2137
2138    if (options->MaxUnrollIterations) {
2139       loop_state *ls = analyze_loop_variables(ir);
2140       if (ls->loop_found) {
2141          OPT(set_loop_controls, ir, ls);
2142          OPT(unroll_loops, ir, ls, options);
2143       }
2144       delete ls;
2145    }
2146
2147 #undef OPT
2148
2149    return progress;
2150 }
2151
2152 extern "C" {
2153
2154 /**
2155  * To be called at GL teardown time, this frees compiler datastructures.
2156  *
2157  * After calling this, any previously compiled shaders and shader
2158  * programs would be invalid.  So this should happen at approximately
2159  * program exit.
2160  */
2161 void
2162 _mesa_destroy_shader_compiler(void)
2163 {
2164    _mesa_destroy_shader_compiler_caches();
2165
2166    _mesa_glsl_release_types();
2167 }
2168
2169 /**
2170  * Releases compiler caches to trade off performance for memory.
2171  *
2172  * Intended to be used with glReleaseShaderCompiler().
2173  */
2174 void
2175 _mesa_destroy_shader_compiler_caches(void)
2176 {
2177    _mesa_glsl_release_builtin_functions();
2178 }
2179
2180 }