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 <inttypes.h> /* for PRIx64 macro */
  24 #include <stdio.h>
  25 #include <stdarg.h>
  26 #include <string.h>
  27 #include <assert.h>
  28
  29 #include "main/core.h" /* for struct gl_context */
  30 #include "main/context.h"
  31 #include "main/debug_output.h"
  32 #include "main/formats.h"
  33 #include "main/shaderobj.h"
  34 #include "util/u_atomic.h" /* for p_atomic_cmpxchg */
  35 #include "util/ralloc.h"
  36 #include "util/disk_cache.h"
  37 #include "util/mesa-sha1.h"
  38 #include "ast.h"
  39 #include "glsl_parser_extras.h"
  40 #include "glsl_parser.h"
  41 #include "ir_optimization.h"
  42 #include "loop_analysis.h"
  43 #include "builtin_functions.h"
  44
  45 /**
  46  * Format a short human-readable description of the given GLSL version.
  47  */
  48 const char *
  49 glsl_compute_version_string(void *mem_ctx, bool is_es, unsigned version)
  50 {
  51    return ralloc_asprintf(mem_ctx, "GLSL%s %d.%02d", is_es ? " ES" : "",
  52                           version / 100, version % 100);
  53 }
  54
  55
  56 static const unsigned known_desktop_glsl_versions[] =
  57    { 110, 120, 130, 140, 150, 330, 400, 410, 420, 430, 440, 450 };
  58 static const unsigned known_desktop_gl_versions[] =
  59    {  20,  21,  30,  31,  32,  33,  40,  41,  42,  43,  44,  45 };
  60
  61
  62 _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
  63                                                gl_shader_stage stage,
  64                                                void *mem_ctx)
  65    : ctx(_ctx), cs_input_local_size_specified(false), cs_input_local_size(),
  66      switch_state()
  67 {
  68    assert(stage < MESA_SHADER_STAGES);
  69    this->stage = stage;
  70
  71    this->scanner = NULL;
  72    this->translation_unit.make_empty();
  73    this->symbols = new(mem_ctx) glsl_symbol_table;
  74
  75    this->linalloc = linear_alloc_parent(this, 0);
  76
  77    this->info_log = ralloc_strdup(mem_ctx, "");
  78    this->error = false;
  79    this->loop_nesting_ast = NULL;
  80
  81    this->uses_builtin_functions = false;
  82
  83    /* Set default language version and extensions */
  84    this->language_version = 110;
  85    this->forced_language_version = ctx->Const.ForceGLSLVersion;
  86    this->zero_init = ctx->Const.GLSLZeroInit;
  87    this->gl_version = 20;
  88    this->compat_shader = true;
  89    this->es_shader = false;
  90    this->ARB_texture_rectangle_enable = true;
  91
  92    /* OpenGL ES 2.0 has different defaults from desktop GL. */
  93    if (ctx->API == API_OPENGLES2) {
  94       this->language_version = 100;
  95       this->es_shader = true;
  96       this->ARB_texture_rectangle_enable = false;
  97    }
  98
  99    this->extensions = &ctx->Extensions;
 100
 101    this->Const.MaxLights = ctx->Const.MaxLights;
 102    this->Const.MaxClipPlanes = ctx->Const.MaxClipPlanes;
 103    this->Const.MaxTextureUnits = ctx->Const.MaxTextureUnits;
 104    this->Const.MaxTextureCoords = ctx->Const.MaxTextureCoordUnits;
 105    this->Const.MaxVertexAttribs = ctx->Const.Program[MESA_SHADER_VERTEX].MaxAttribs;
 106    this->Const.MaxVertexUniformComponents = ctx->Const.Program[MESA_SHADER_VERTEX].MaxUniformComponents;
 107    this->Const.MaxVertexTextureImageUnits = ctx->Const.Program[MESA_SHADER_VERTEX].MaxTextureImageUnits;
 108    this->Const.MaxCombinedTextureImageUnits = ctx->Const.MaxCombinedTextureImageUnits;
 109    this->Const.MaxTextureImageUnits = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxTextureImageUnits;
 110    this->Const.MaxFragmentUniformComponents = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxUniformComponents;
 111    this->Const.MinProgramTexelOffset = ctx->Const.MinProgramTexelOffset;
 112    this->Const.MaxProgramTexelOffset = ctx->Const.MaxProgramTexelOffset;
 113
 114    this->Const.MaxDrawBuffers = ctx->Const.MaxDrawBuffers;
 115
 116    this->Const.MaxDualSourceDrawBuffers = ctx->Const.MaxDualSourceDrawBuffers;
 117
 118    /* 1.50 constants */
 119    this->Const.MaxVertexOutputComponents = ctx->Const.Program[MESA_SHADER_VERTEX].MaxOutputComponents;
 120    this->Const.MaxGeometryInputComponents = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxInputComponents;
 121    this->Const.MaxGeometryOutputComponents = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxOutputComponents;
 122    this->Const.MaxFragmentInputComponents = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxInputComponents;
 123    this->Const.MaxGeometryTextureImageUnits = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxTextureImageUnits;
 124    this->Const.MaxGeometryOutputVertices = ctx->Const.MaxGeometryOutputVertices;
 125    this->Const.MaxGeometryTotalOutputComponents = ctx->Const.MaxGeometryTotalOutputComponents;
 126    this->Const.MaxGeometryUniformComponents = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxUniformComponents;
 127
 128    this->Const.MaxVertexAtomicCounters = ctx->Const.Program[MESA_SHADER_VERTEX].MaxAtomicCounters;
 129    this->Const.MaxTessControlAtomicCounters = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxAtomicCounters;
 130    this->Const.MaxTessEvaluationAtomicCounters = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxAtomicCounters;
 131    this->Const.MaxGeometryAtomicCounters = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxAtomicCounters;
 132    this->Const.MaxFragmentAtomicCounters = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxAtomicCounters;
 133    this->Const.MaxComputeAtomicCounters = ctx->Const.Program[MESA_SHADER_COMPUTE].MaxAtomicCounters;
 134    this->Const.MaxCombinedAtomicCounters = ctx->Const.MaxCombinedAtomicCounters;
 135    this->Const.MaxAtomicBufferBindings = ctx->Const.MaxAtomicBufferBindings;
 136    this->Const.MaxVertexAtomicCounterBuffers =
 137       ctx->Const.Program[MESA_SHADER_VERTEX].MaxAtomicBuffers;
 138    this->Const.MaxTessControlAtomicCounterBuffers =
 139       ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxAtomicBuffers;
 140    this->Const.MaxTessEvaluationAtomicCounterBuffers =
 141       ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxAtomicBuffers;
 142    this->Const.MaxGeometryAtomicCounterBuffers =
 143       ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxAtomicBuffers;
 144    this->Const.MaxFragmentAtomicCounterBuffers =
 145       ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxAtomicBuffers;
 146    this->Const.MaxComputeAtomicCounterBuffers =
 147       ctx->Const.Program[MESA_SHADER_COMPUTE].MaxAtomicBuffers;
 148    this->Const.MaxCombinedAtomicCounterBuffers =
 149       ctx->Const.MaxCombinedAtomicBuffers;
 150    this->Const.MaxAtomicCounterBufferSize =
 151       ctx->Const.MaxAtomicBufferSize;
 152
 153    /* ARB_enhanced_layouts constants */
 154    this->Const.MaxTransformFeedbackBuffers = ctx->Const.MaxTransformFeedbackBuffers;
 155    this->Const.MaxTransformFeedbackInterleavedComponents = ctx->Const.MaxTransformFeedbackInterleavedComponents;
 156
 157    /* Compute shader constants */
 158    for (unsigned i = 0; i < ARRAY_SIZE(this->Const.MaxComputeWorkGroupCount); i++)
 159       this->Const.MaxComputeWorkGroupCount[i] = ctx->Const.MaxComputeWorkGroupCount[i];
 160    for (unsigned i = 0; i < ARRAY_SIZE(this->Const.MaxComputeWorkGroupSize); i++)
 161       this->Const.MaxComputeWorkGroupSize[i] = ctx->Const.MaxComputeWorkGroupSize[i];
 162
 163    this->Const.MaxComputeTextureImageUnits = ctx->Const.Program[MESA_SHADER_COMPUTE].MaxTextureImageUnits;
 164    this->Const.MaxComputeUniformComponents = ctx->Const.Program[MESA_SHADER_COMPUTE].MaxUniformComponents;
 165
 166    this->Const.MaxImageUnits = ctx->Const.MaxImageUnits;
 167    this->Const.MaxCombinedShaderOutputResources = ctx->Const.MaxCombinedShaderOutputResources;
 168    this->Const.MaxImageSamples = ctx->Const.MaxImageSamples;
 169    this->Const.MaxVertexImageUniforms = ctx->Const.Program[MESA_SHADER_VERTEX].MaxImageUniforms;
 170    this->Const.MaxTessControlImageUniforms = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxImageUniforms;
 171    this->Const.MaxTessEvaluationImageUniforms = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxImageUniforms;
 172    this->Const.MaxGeometryImageUniforms = ctx->Const.Program[MESA_SHADER_GEOMETRY].MaxImageUniforms;
 173    this->Const.MaxFragmentImageUniforms = ctx->Const.Program[MESA_SHADER_FRAGMENT].MaxImageUniforms;
 174    this->Const.MaxComputeImageUniforms = ctx->Const.Program[MESA_SHADER_COMPUTE].MaxImageUniforms;
 175    this->Const.MaxCombinedImageUniforms = ctx->Const.MaxCombinedImageUniforms;
 176
 177    /* ARB_viewport_array */
 178    this->Const.MaxViewports = ctx->Const.MaxViewports;
 179
 180    /* tessellation shader constants */
 181    this->Const.MaxPatchVertices = ctx->Const.MaxPatchVertices;
 182    this->Const.MaxTessGenLevel = ctx->Const.MaxTessGenLevel;
 183    this->Const.MaxTessControlInputComponents = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxInputComponents;
 184    this->Const.MaxTessControlOutputComponents = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxOutputComponents;
 185    this->Const.MaxTessControlTextureImageUnits = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxTextureImageUnits;
 186    this->Const.MaxTessEvaluationInputComponents = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxInputComponents;
 187    this->Const.MaxTessEvaluationOutputComponents = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxOutputComponents;
 188    this->Const.MaxTessEvaluationTextureImageUnits = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxTextureImageUnits;
 189    this->Const.MaxTessPatchComponents = ctx->Const.MaxTessPatchComponents;
 190    this->Const.MaxTessControlTotalOutputComponents = ctx->Const.MaxTessControlTotalOutputComponents;
 191    this->Const.MaxTessControlUniformComponents = ctx->Const.Program[MESA_SHADER_TESS_CTRL].MaxUniformComponents;
 192    this->Const.MaxTessEvaluationUniformComponents = ctx->Const.Program[MESA_SHADER_TESS_EVAL].MaxUniformComponents;
 193
 194    /* GL 4.5 / OES_sample_variables */
 195    this->Const.MaxSamples = ctx->Const.MaxSamples;
 196
 197    this->current_function = NULL;
 198    this->toplevel_ir = NULL;
 199    this->found_return = false;
 200    this->all_invariant = false;
 201    this->user_structures = NULL;
 202    this->num_user_structures = 0;
 203    this->num_subroutines = 0;
 204    this->subroutines = NULL;
 205    this->num_subroutine_types = 0;
 206    this->subroutine_types = NULL;
 207
 208    /* supported_versions should be large enough to support the known desktop
 209     * GLSL versions plus 4 GLES versions (ES 1.00, ES 3.00, ES 3.10, ES 3.20)
 210     */
 211    STATIC_ASSERT((ARRAY_SIZE(known_desktop_glsl_versions) + 4) ==
 212                  ARRAY_SIZE(this->supported_versions));
 213
 214    /* Populate the list of supported GLSL versions */
 215    /* FINISHME: Once the OpenGL 3.0 'forward compatible' context or
 216     * the OpenGL 3.2 Core context is supported, this logic will need
 217     * change.  Older versions of GLSL are no longer supported
 218     * outside the compatibility contexts of 3.x.
 219     */
 220    this->num_supported_versions = 0;
 221    if (_mesa_is_desktop_gl(ctx)) {
 222       for (unsigned i = 0; i < ARRAY_SIZE(known_desktop_glsl_versions); i++) {
 223          if (known_desktop_glsl_versions[i] <= ctx->Const.GLSLVersion) {
 224             this->supported_versions[this->num_supported_versions].ver
 225                = known_desktop_glsl_versions[i];
 226             this->supported_versions[this->num_supported_versions].gl_ver
 227                = known_desktop_gl_versions[i];
 228             this->supported_versions[this->num_supported_versions].es = false;
 229             this->num_supported_versions++;
 230          }
 231       }
 232    }
 233    if (ctx->API == API_OPENGLES2 || ctx->Extensions.ARB_ES2_compatibility) {
 234       this->supported_versions[this->num_supported_versions].ver = 100;
 235       this->supported_versions[this->num_supported_versions].gl_ver = 20;
 236       this->supported_versions[this->num_supported_versions].es = true;
 237       this->num_supported_versions++;
 238    }
 239    if (_mesa_is_gles3(ctx) || ctx->Extensions.ARB_ES3_compatibility) {
 240       this->supported_versions[this->num_supported_versions].ver = 300;
 241       this->supported_versions[this->num_supported_versions].gl_ver = 30;
 242       this->supported_versions[this->num_supported_versions].es = true;
 243       this->num_supported_versions++;
 244    }
 245    if (_mesa_is_gles31(ctx) || ctx->Extensions.ARB_ES3_1_compatibility) {
 246       this->supported_versions[this->num_supported_versions].ver = 310;
 247       this->supported_versions[this->num_supported_versions].gl_ver = 31;
 248       this->supported_versions[this->num_supported_versions].es = true;
 249       this->num_supported_versions++;
 250    }
 251    if ((ctx->API == API_OPENGLES2 && ctx->Version >= 32) ||
 252        ctx->Extensions.ARB_ES3_2_compatibility) {
 253       this->supported_versions[this->num_supported_versions].ver = 320;
 254       this->supported_versions[this->num_supported_versions].gl_ver = 32;
 255       this->supported_versions[this->num_supported_versions].es = true;
 256       this->num_supported_versions++;
 257    }
 258
 259    /* Create a string for use in error messages to tell the user which GLSL
 260     * versions are supported.
 261     */
 262    char *supported = ralloc_strdup(this, "");
 263    for (unsigned i = 0; i < this->num_supported_versions; i++) {
 264       unsigned ver = this->supported_versions[i].ver;
 265       const char *const prefix = (i == 0)
 266          ? ""
 267          : ((i == this->num_supported_versions - 1) ? ", and " : ", ");
 268       const char *const suffix = (this->supported_versions[i].es) ? " ES" : "";
 269
 270       ralloc_asprintf_append(& supported, "%s%u.%02u%s",
 271                              prefix,
 272                              ver / 100, ver % 100,
 273                              suffix);
 274    }
 275
 276    this->supported_version_string = supported;
 277
 278    if (ctx->Const.ForceGLSLExtensionsWarn)
 279       _mesa_glsl_process_extension("all", NULL, "warn", NULL, this);
 280
 281    this->default_uniform_qualifier = new(this) ast_type_qualifier();
 282    this->default_uniform_qualifier->flags.q.shared = 1;
 283    this->default_uniform_qualifier->flags.q.column_major = 1;
 284
 285    this->default_shader_storage_qualifier = new(this) ast_type_qualifier();
 286    this->default_shader_storage_qualifier->flags.q.shared = 1;
 287    this->default_shader_storage_qualifier->flags.q.column_major = 1;
 288
 289    this->fs_uses_gl_fragcoord = false;
 290    this->fs_redeclares_gl_fragcoord = false;
 291    this->fs_origin_upper_left = false;
 292    this->fs_pixel_center_integer = false;
 293    this->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers = false;
 294
 295    this->gs_input_prim_type_specified = false;
 296    this->tcs_output_vertices_specified = false;
 297    this->gs_input_size = 0;
 298    this->in_qualifier = new(this) ast_type_qualifier();
 299    this->out_qualifier = new(this) ast_type_qualifier();
 300    this->fs_early_fragment_tests = false;
 301    this->fs_inner_coverage = false;
 302    this->fs_post_depth_coverage = false;
 303    this->fs_blend_support = 0;
 304    memset(this->atomic_counter_offsets, 0,
 305           sizeof(this->atomic_counter_offsets));
 306    this->allow_extension_directive_midshader =
 307       ctx->Const.AllowGLSLExtensionDirectiveMidShader;
 308
 309    this->cs_input_local_size_variable_specified = false;
 310 }
 311
 312 /**
 313  * Determine whether the current GLSL version is sufficiently high to support
 314  * a certain feature, and generate an error message if it isn't.
 315  *
 316  * \param required_glsl_version and \c required_glsl_es_version are
 317  * interpreted as they are in _mesa_glsl_parse_state::is_version().
 318  *
 319  * \param locp is the parser location where the error should be reported.
 320  *
 321  * \param fmt (and additional arguments) constitute a printf-style error
 322  * message to report if the version check fails.  Information about the
 323  * current and required GLSL versions will be appended.  So, for example, if
 324  * the GLSL version being compiled is 1.20, and check_version(130, 300, locp,
 325  * "foo unsupported") is called, the error message will be "foo unsupported in
 326  * GLSL 1.20 (GLSL 1.30 or GLSL 3.00 ES required)".
 327  */
 328 bool
 329 _mesa_glsl_parse_state::check_version(unsigned required_glsl_version,
 330                                       unsigned required_glsl_es_version,
 331                                       YYLTYPE *locp, const char *fmt, ...)
 332 {
 333    if (this->is_version(required_glsl_version, required_glsl_es_version))
 334       return true;
 335
 336    va_list args;
 337    va_start(args, fmt);
 338    char *problem = ralloc_vasprintf(this, fmt, args);
 339    va_end(args);
 340    const char *glsl_version_string
 341       = glsl_compute_version_string(this, false, required_glsl_version);
 342    const char *glsl_es_version_string
 343       = glsl_compute_version_string(this, true, required_glsl_es_version);
 344    const char *requirement_string = "";
 345    if (required_glsl_version && required_glsl_es_version) {
 346       requirement_string = ralloc_asprintf(this, " (%s or %s required)",
 347                                            glsl_version_string,
 348                                            glsl_es_version_string);
 349    } else if (required_glsl_version) {
 350       requirement_string = ralloc_asprintf(this, " (%s required)",
 351                                            glsl_version_string);
 352    } else if (required_glsl_es_version) {
 353       requirement_string = ralloc_asprintf(this, " (%s required)",
 354                                            glsl_es_version_string);
 355    }
 356    _mesa_glsl_error(locp, this, "%s in %s%s",
 357                     problem, this->get_version_string(),
 358                     requirement_string);
 359
 360    return false;
 361 }
 362
 363 /**
 364  * Process a GLSL #version directive.
 365  *
 366  * \param version is the integer that follows the #version token.
 367  *
 368  * \param ident is a string identifier that follows the integer, if any is
 369  * present.  Otherwise NULL.
 370  */
 371 void
 372 _mesa_glsl_parse_state::process_version_directive(YYLTYPE *locp, int version,
 373                                                   const char *ident)
 374 {
 375    bool es_token_present = false;
 376    bool compat_token_present = false;
 377    if (ident) {
 378       if (strcmp(ident, "es") == 0) {
 379          es_token_present = true;
 380       } else if (version >= 150) {
 381          if (strcmp(ident, "core") == 0) {
 382             /* Accept the token.  There's no need to record that this is
 383              * a core profile shader since that's the only profile we support.
 384              */
 385          } else if (strcmp(ident, "compatibility") == 0) {
 386             compat_token_present = true;
 387
 388             if (this->ctx->API != API_OPENGL_COMPAT) {
 389                _mesa_glsl_error(locp, this,
 390                                 "the compatibility profile is not supported");
 391             }
 392          } else {
 393             _mesa_glsl_error(locp, this,
 394                              "\"%s\" is not a valid shading language profile; "
 395                              "if present, it must be \"core\"", ident);
 396          }
 397       } else {
 398          _mesa_glsl_error(locp, this,
 399                           "illegal text following version number");
 400       }
 401    }
 402
 403    this->es_shader = es_token_present;
 404    if (version == 100) {
 405       if (es_token_present) {
 406          _mesa_glsl_error(locp, this,
 407                           "GLSL 1.00 ES should be selected using "
 408                           "`#version 100'");
 409       } else {
 410          this->es_shader = true;
 411       }
 412    }
 413
 414    if (this->es_shader) {
 415       this->ARB_texture_rectangle_enable = false;
 416    }
 417
 418    if (this->forced_language_version)
 419       this->language_version = this->forced_language_version;
 420    else
 421       this->language_version = version;
 422
 423    this->compat_shader = compat_token_present ||
 424                          (!this->es_shader && this->language_version < 140);
 425
 426    bool supported = false;
 427    for (unsigned i = 0; i < this->num_supported_versions; i++) {
 428       if (this->supported_versions[i].ver == this->language_version
 429           && this->supported_versions[i].es == this->es_shader) {
 430          this->gl_version = this->supported_versions[i].gl_ver;
 431          supported = true;
 432          break;
 433       }
 434    }
 435
 436    if (!supported) {
 437       _mesa_glsl_error(locp, this, "%s is not supported. "
 438                        "Supported versions are: %s",
 439                        this->get_version_string(),
 440                        this->supported_version_string);
 441
 442       /* On exit, the language_version must be set to a valid value.
 443        * Later calls to _mesa_glsl_initialize_types will misbehave if
 444        * the version is invalid.
 445        */
 446       switch (this->ctx->API) {
 447       case API_OPENGL_COMPAT:
 448       case API_OPENGL_CORE:
 449          this->language_version = this->ctx->Const.GLSLVersion;
 450          break;
 451
 452       case API_OPENGLES:
 453          assert(!"Should not get here.");
 454          /* FALLTHROUGH */
 455
 456       case API_OPENGLES2:
 457          this->language_version = 100;
 458          break;
 459       }
 460    }
 461 }
 462
 463
 464 /* This helper function will append the given message to the shader's
 465    info log and report it via GL_ARB_debug_output. Per that extension,
 466    'type' is one of the enum values classifying the message, and
 467    'id' is the implementation-defined ID of the given message. */
 468 static void
 469 _mesa_glsl_msg(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 470                GLenum type, const char *fmt, va_list ap)
 471 {
 472    bool error = (type == MESA_DEBUG_TYPE_ERROR);
 473    GLuint msg_id = 0;
 474
 475    assert(state->info_log != NULL);
 476
 477    /* Get the offset that the new message will be written to. */
 478    int msg_offset = strlen(state->info_log);
 479
 480    ralloc_asprintf_append(&state->info_log, "%u:%u(%u): %s: ",
 481                                             locp->source,
 482                                             locp->first_line,
 483                                             locp->first_column,
 484                                             error ? "error" : "warning");
 485    ralloc_vasprintf_append(&state->info_log, fmt, ap);
 486
 487    const char *const msg = &state->info_log[msg_offset];
 488    struct gl_context *ctx = state->ctx;
 489
 490    /* Report the error via GL_ARB_debug_output. */
 491    _mesa_shader_debug(ctx, type, &msg_id, msg);
 492
 493    ralloc_strcat(&state->info_log, "\n");
 494 }
 495
 496 void
 497 _mesa_glsl_error(YYLTYPE *locp, _mesa_glsl_parse_state *state,
 498                  const char *fmt, ...)
 499 {
 500    va_list ap;
 501
 502    state->error = true;
 503
 504    va_start(ap, fmt);
 505    _mesa_glsl_msg(locp, state, MESA_DEBUG_TYPE_ERROR, fmt, ap);
 506    va_end(ap);
 507 }
 508
 509
 510 void
 511 _mesa_glsl_warning(const YYLTYPE *locp, _mesa_glsl_parse_state *state,
 512                    const char *fmt, ...)
 513 {
 514    va_list ap;
 515
 516    va_start(ap, fmt);
 517    _mesa_glsl_msg(locp, state, MESA_DEBUG_TYPE_OTHER, fmt, ap);
 518    va_end(ap);
 519 }
 520
 521
 522 /**
 523  * Enum representing the possible behaviors that can be specified in
 524  * an #extension directive.
 525  */
 526 enum ext_behavior {
 527    extension_disable,
 528    extension_enable,
 529    extension_require,
 530    extension_warn
 531 };
 532
 533 /**
 534  * Element type for _mesa_glsl_supported_extensions
 535  */
 536 struct _mesa_glsl_extension {
 537    /**
 538     * Name of the extension when referred to in a GLSL extension
 539     * statement
 540     */
 541    const char *name;
 542
 543    /**
 544     * Whether this extension is a part of AEP
 545     */
 546    bool aep;
 547
 548    /**
 549     * Predicate that checks whether the relevant extension is available for
 550     * this context.
 551     */
 552    bool (*available_pred)(const struct gl_context *,
 553                           gl_api api, uint8_t version);
 554
 555    /**
 556     * Flag in the _mesa_glsl_parse_state struct that should be set
 557     * when this extension is enabled.
 558     *
 559     * See note in _mesa_glsl_extension::supported_flag about "pointer
 560     * to member" types.
 561     */
 562    bool _mesa_glsl_parse_state::* enable_flag;
 563
 564    /**
 565     * Flag in the _mesa_glsl_parse_state struct that should be set
 566     * when the shader requests "warn" behavior for this extension.
 567     *
 568     * See note in _mesa_glsl_extension::supported_flag about "pointer
 569     * to member" types.
 570     */
 571    bool _mesa_glsl_parse_state::* warn_flag;
 572
 573
 574    bool compatible_with_state(const _mesa_glsl_parse_state *state,
 575                               gl_api api, uint8_t gl_version) const;
 576    void set_flags(_mesa_glsl_parse_state *state, ext_behavior behavior) const;
 577 };
 578
 579 /** Checks if the context supports a user-facing extension */
 580 #define EXT(name_str, driver_cap, ...) \
 581 static MAYBE_UNUSED bool \
 582 has_##name_str(const struct gl_context *ctx, gl_api api, uint8_t version) \
 583 { \
 584    return ctx->Extensions.driver_cap && (version >= \
 585           _mesa_extension_table[MESA_EXTENSION_##name_str].version[api]); \
 586 }
 587 #include "main/extensions_table.h"
 588 #undef EXT
 589
 590 #define EXT(NAME)                                           \
 591    { "GL_" #NAME, false, has_##NAME,                        \
 592      &_mesa_glsl_parse_state::NAME##_enable,                \
 593      &_mesa_glsl_parse_state::NAME##_warn }
 594
 595 #define EXT_AEP(NAME)                                       \
 596    { "GL_" #NAME, true, has_##NAME,                         \
 597      &_mesa_glsl_parse_state::NAME##_enable,                \
 598      &_mesa_glsl_parse_state::NAME##_warn }
 599
 600 /**
 601  * Table of extensions that can be enabled/disabled within a shader,
 602  * and the conditions under which they are supported.
 603  */
 604 static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
 605    /* ARB extensions go here, sorted alphabetically.
 606     */
 607    EXT(ARB_ES3_1_compatibility),
 608    EXT(ARB_ES3_2_compatibility),
 609    EXT(ARB_arrays_of_arrays),
 610    EXT(ARB_bindless_texture),
 611    EXT(ARB_compute_shader),
 612    EXT(ARB_compute_variable_group_size),
 613    EXT(ARB_conservative_depth),
 614    EXT(ARB_cull_distance),
 615    EXT(ARB_derivative_control),
 616    EXT(ARB_draw_buffers),
 617    EXT(ARB_draw_instanced),
 618    EXT(ARB_enhanced_layouts),
 619    EXT(ARB_explicit_attrib_location),
 620    EXT(ARB_explicit_uniform_location),
 621    EXT(ARB_fragment_coord_conventions),
 622    EXT(ARB_fragment_layer_viewport),
 623    EXT(ARB_gpu_shader5),
 624    EXT(ARB_gpu_shader_fp64),
 625    EXT(ARB_gpu_shader_int64),
 626    EXT(ARB_post_depth_coverage),
 627    EXT(ARB_sample_shading),
 628    EXT(ARB_separate_shader_objects),
 629    EXT(ARB_shader_atomic_counter_ops),
 630    EXT(ARB_shader_atomic_counters),
 631    EXT(ARB_shader_ballot),
 632    EXT(ARB_shader_bit_encoding),
 633    EXT(ARB_shader_clock),
 634    EXT(ARB_shader_draw_parameters),
 635    EXT(ARB_shader_group_vote),
 636    EXT(ARB_shader_image_load_store),
 637    EXT(ARB_shader_image_size),
 638    EXT(ARB_shader_precision),
 639    EXT(ARB_shader_stencil_export),
 640    EXT(ARB_shader_storage_buffer_object),
 641    EXT(ARB_shader_subroutine),
 642    EXT(ARB_shader_texture_image_samples),
 643    EXT(ARB_shader_texture_lod),
 644    EXT(ARB_shader_viewport_layer_array),
 645    EXT(ARB_shading_language_420pack),
 646    EXT(ARB_shading_language_packing),
 647    EXT(ARB_tessellation_shader),
 648    EXT(ARB_texture_cube_map_array),
 649    EXT(ARB_texture_gather),
 650    EXT(ARB_texture_multisample),
 651    EXT(ARB_texture_query_levels),
 652    EXT(ARB_texture_query_lod),
 653    EXT(ARB_texture_rectangle),
 654    EXT(ARB_uniform_buffer_object),
 655    EXT(ARB_vertex_attrib_64bit),
 656    EXT(ARB_viewport_array),
 657
 658    /* KHR extensions go here, sorted alphabetically.
 659     */
 660    EXT_AEP(KHR_blend_equation_advanced),
 661
 662    /* OES extensions go here, sorted alphabetically.
 663     */
 664    EXT(OES_EGL_image_external),
 665    EXT(OES_geometry_point_size),
 666    EXT(OES_geometry_shader),
 667    EXT(OES_gpu_shader5),
 668    EXT(OES_primitive_bounding_box),
 669    EXT_AEP(OES_sample_variables),
 670    EXT_AEP(OES_shader_image_atomic),
 671    EXT(OES_shader_io_blocks),
 672    EXT_AEP(OES_shader_multisample_interpolation),
 673    EXT(OES_standard_derivatives),
 674    EXT(OES_tessellation_point_size),
 675    EXT(OES_tessellation_shader),
 676    EXT(OES_texture_3D),
 677    EXT(OES_texture_buffer),
 678    EXT(OES_texture_cube_map_array),
 679    EXT_AEP(OES_texture_storage_multisample_2d_array),
 680    EXT(OES_viewport_array),
 681
 682    /* All other extensions go here, sorted alphabetically.
 683     */
 684    EXT(AMD_conservative_depth),
 685    EXT(AMD_shader_stencil_export),
 686    EXT(AMD_shader_trinary_minmax),
 687    EXT(AMD_vertex_shader_layer),
 688    EXT(AMD_vertex_shader_viewport_index),
 689    EXT(ANDROID_extension_pack_es31a),
 690    EXT(EXT_blend_func_extended),
 691    EXT(EXT_frag_depth),
 692    EXT(EXT_draw_buffers),
 693    EXT(EXT_clip_cull_distance),
 694    EXT(EXT_geometry_point_size),
 695    EXT_AEP(EXT_geometry_shader),
 696    EXT_AEP(EXT_gpu_shader5),
 697    EXT_AEP(EXT_primitive_bounding_box),
 698    EXT(EXT_separate_shader_objects),
 699    EXT(EXT_shader_framebuffer_fetch),
 700    EXT(EXT_shader_integer_mix),
 701    EXT_AEP(EXT_shader_io_blocks),
 702    EXT(EXT_shader_samples_identical),
 703    EXT(EXT_tessellation_point_size),
 704    EXT_AEP(EXT_tessellation_shader),
 705    EXT(EXT_texture_array),
 706    EXT_AEP(EXT_texture_buffer),
 707    EXT_AEP(EXT_texture_cube_map_array),
 708    EXT(INTEL_conservative_rasterization),
 709    EXT(MESA_shader_integer_functions),
 710    EXT(NV_image_formats),
 711 };
 712
 713 #undef EXT
 714
 715
 716 /**
 717  * Determine whether a given extension is compatible with the target,
 718  * API, and extension information in the current parser state.
 719  */
 720 bool _mesa_glsl_extension::compatible_with_state(
 721       const _mesa_glsl_parse_state *state, gl_api api, uint8_t gl_version) const
 722 {
 723    return this->available_pred(state->ctx, api, gl_version);
 724 }
 725
 726 /**
 727  * Set the appropriate flags in the parser state to establish the
 728  * given behavior for this extension.
 729  */
 730 void _mesa_glsl_extension::set_flags(_mesa_glsl_parse_state *state,
 731                                      ext_behavior behavior) const
 732 {
 733    /* Note: the ->* operator indexes into state by the
 734     * offsets this->enable_flag and this->warn_flag.  See
 735     * _mesa_glsl_extension::supported_flag for more info.
 736     */
 737    state->*(this->enable_flag) = (behavior != extension_disable);
 738    state->*(this->warn_flag)   = (behavior == extension_warn);
 739 }
 740
 741 /**
 742  * Find an extension by name in _mesa_glsl_supported_extensions.  If
 743  * the name is not found, return NULL.
 744  */
 745 static const _mesa_glsl_extension *find_extension(const char *name)
 746 {
 747    for (unsigned i = 0; i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
 748       if (strcmp(name, _mesa_glsl_supported_extensions[i].name) == 0) {
 749          return &_mesa_glsl_supported_extensions[i];
 750       }
 751    }
 752    return NULL;
 753 }
 754
 755 bool
 756 _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
 757                              const char *behavior_string, YYLTYPE *behavior_locp,
 758                              _mesa_glsl_parse_state *state)
 759 {
 760    uint8_t gl_version = state->ctx->Extensions.Version;
 761    gl_api api = state->ctx->API;
 762    ext_behavior behavior;
 763    if (strcmp(behavior_string, "warn") == 0) {
 764       behavior = extension_warn;
 765    } else if (strcmp(behavior_string, "require") == 0) {
 766       behavior = extension_require;
 767    } else if (strcmp(behavior_string, "enable") == 0) {
 768       behavior = extension_enable;
 769    } else if (strcmp(behavior_string, "disable") == 0) {
 770       behavior = extension_disable;
 771    } else {
 772       _mesa_glsl_error(behavior_locp, state,
 773                        "unknown extension behavior `%s'",
 774                        behavior_string);
 775       return false;
 776    }
 777
 778    /* If we're in a desktop context but with an ES shader, use an ES API enum
 779     * to verify extension availability.
 780     */
 781    if (state->es_shader && api != API_OPENGLES2)
 782       api = API_OPENGLES2;
 783    /* Use the language-version derived GL version to extension checks, unless
 784     * we're using meta, which sets the version to the max.
 785     */
 786    if (gl_version != 0xff)
 787       gl_version = state->gl_version;
 788
 789    if (strcmp(name, "all") == 0) {
 790       if ((behavior == extension_enable) || (behavior == extension_require)) {
 791          _mesa_glsl_error(name_locp, state, "cannot %s all extensions",
 792                           (behavior == extension_enable)
 793                           ? "enable" : "require");
 794          return false;
 795       } else {
 796          for (unsigned i = 0;
 797               i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
 798             const _mesa_glsl_extension *extension
 799                = &_mesa_glsl_supported_extensions[i];
 800             if (extension->compatible_with_state(state, api, gl_version)) {
 801                _mesa_glsl_supported_extensions[i].set_flags(state, behavior);
 802             }
 803          }
 804       }
 805    } else {
 806       const _mesa_glsl_extension *extension = find_extension(name);
 807       if (extension && extension->compatible_with_state(state, api, gl_version)) {
 808          extension->set_flags(state, behavior);
 809          if (extension->available_pred == has_ANDROID_extension_pack_es31a) {
 810             for (unsigned i = 0;
 811                  i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
 812                const _mesa_glsl_extension *extension =
 813                   &_mesa_glsl_supported_extensions[i];
 814
 815                if (!extension->aep)
 816                   continue;
 817                /* AEP should not be enabled if all of the sub-extensions can't
 818                 * also be enabled. This is not the proper layer to do such
 819                 * error-checking though.
 820                 */
 821                assert(extension->compatible_with_state(state, api, gl_version));
 822                extension->set_flags(state, behavior);
 823             }
 824          }
 825       } else {
 826          static const char fmt[] = "extension `%s' unsupported in %s shader";
 827
 828          if (behavior == extension_require) {
 829             _mesa_glsl_error(name_locp, state, fmt,
 830                              name, _mesa_shader_stage_to_string(state->stage));
 831             return false;
 832          } else {
 833             _mesa_glsl_warning(name_locp, state, fmt,
 834                                name, _mesa_shader_stage_to_string(state->stage));
 835          }
 836       }
 837    }
 838
 839    return true;
 840 }
 841
 842
 843 /**
 844  * Recurses through <type> and <expr> if <expr> is an aggregate initializer
 845  * and sets <expr>'s <constructor_type> field to <type>. Gives later functions
 846  * (process_array_constructor, et al) sufficient information to do type
 847  * checking.
 848  *
 849  * Operates on assignments involving an aggregate initializer. E.g.,
 850  *
 851  * vec4 pos = {1.0, -1.0, 0.0, 1.0};
 852  *
 853  * or more ridiculously,
 854  *
 855  * struct S {
 856  *     vec4 v[2];
 857  * };
 858  *
 859  * struct {
 860  *     S a[2], b;
 861  *     int c;
 862  * } aggregate = {
 863  *     {
 864  *         {
 865  *             {
 866  *                 {1.0, 2.0, 3.0, 4.0}, // a[0].v[0]
 867  *                 {5.0, 6.0, 7.0, 8.0}  // a[0].v[1]
 868  *             } // a[0].v
 869  *         }, // a[0]
 870  *         {
 871  *             {
 872  *                 {1.0, 2.0, 3.0, 4.0}, // a[1].v[0]
 873  *                 {5.0, 6.0, 7.0, 8.0}  // a[1].v[1]
 874  *             } // a[1].v
 875  *         } // a[1]
 876  *     }, // a
 877  *     {
 878  *         {
 879  *             {1.0, 2.0, 3.0, 4.0}, // b.v[0]
 880  *             {5.0, 6.0, 7.0, 8.0}  // b.v[1]
 881  *         } // b.v
 882  *     }, // b
 883  *     4 // c
 884  * };
 885  *
 886  * This pass is necessary because the right-hand side of <type> e = { ... }
 887  * doesn't contain sufficient information to determine if the types match.
 888  */
 889 void
 890 _mesa_ast_set_aggregate_type(const glsl_type *type,
 891                              ast_expression *expr)
 892 {
 893    ast_aggregate_initializer *ai = (ast_aggregate_initializer *)expr;
 894    ai->constructor_type = type;
 895
 896    /* If the aggregate is an array, recursively set its elements' types. */
 897    if (type->is_array()) {
 898       /* Each array element has the type type->fields.array.
 899        *
 900        * E.g., if <type> if struct S[2] we want to set each element's type to
 901        * struct S.
 902        */
 903       for (exec_node *expr_node = ai->expressions.get_head_raw();
 904            !expr_node->is_tail_sentinel();
 905            expr_node = expr_node->next) {
 906          ast_expression *expr = exec_node_data(ast_expression, expr_node,
 907                                                link);
 908
 909          if (expr->oper == ast_aggregate)
 910             _mesa_ast_set_aggregate_type(type->fields.array, expr);
 911       }
 912
 913    /* If the aggregate is a struct, recursively set its fields' types. */
 914    } else if (type->is_record()) {
 915       exec_node *expr_node = ai->expressions.get_head_raw();
 916
 917       /* Iterate through the struct's fields. */
 918       for (unsigned i = 0; !expr_node->is_tail_sentinel() && i < type->length;
 919            i++, expr_node = expr_node->next) {
 920          ast_expression *expr = exec_node_data(ast_expression, expr_node,
 921                                                link);
 922
 923          if (expr->oper == ast_aggregate) {
 924             _mesa_ast_set_aggregate_type(type->fields.structure[i].type, expr);
 925          }
 926       }
 927    /* If the aggregate is a matrix, set its columns' types. */
 928    } else if (type->is_matrix()) {
 929       for (exec_node *expr_node = ai->expressions.get_head_raw();
 930            !expr_node->is_tail_sentinel();
 931            expr_node = expr_node->next) {
 932          ast_expression *expr = exec_node_data(ast_expression, expr_node,
 933                                                link);
 934
 935          if (expr->oper == ast_aggregate)
 936             _mesa_ast_set_aggregate_type(type->column_type(), expr);
 937       }
 938    }
 939 }
 940
 941 void
 942 _mesa_ast_process_interface_block(YYLTYPE *locp,
 943                                   _mesa_glsl_parse_state *state,
 944                                   ast_interface_block *const block,
 945                                   const struct ast_type_qualifier &q)
 946 {
 947    if (q.flags.q.buffer) {
 948       if (!state->has_shader_storage_buffer_objects()) {
 949          _mesa_glsl_error(locp, state,
 950                           "#version 430 / GL_ARB_shader_storage_buffer_object "
 951                           "required for defining shader storage blocks");
 952       } else if (state->ARB_shader_storage_buffer_object_warn) {
 953          _mesa_glsl_warning(locp, state,
 954                             "#version 430 / GL_ARB_shader_storage_buffer_object "
 955                             "required for defining shader storage blocks");
 956       }
 957    } else if (q.flags.q.uniform) {
 958       if (!state->has_uniform_buffer_objects()) {
 959          _mesa_glsl_error(locp, state,
 960                           "#version 140 / GL_ARB_uniform_buffer_object "
 961                           "required for defining uniform blocks");
 962       } else if (state->ARB_uniform_buffer_object_warn) {
 963          _mesa_glsl_warning(locp, state,
 964                             "#version 140 / GL_ARB_uniform_buffer_object "
 965                             "required for defining uniform blocks");
 966       }
 967    } else {
 968       if (!state->has_shader_io_blocks()) {
 969          if (state->es_shader) {
 970             _mesa_glsl_error(locp, state,
 971                              "GL_OES_shader_io_blocks or #version 320 "
 972                              "required for using interface blocks");
 973          } else {
 974             _mesa_glsl_error(locp, state,
 975                              "#version 150 required for using "
 976                              "interface blocks");
 977          }
 978       }
 979    }
 980
 981    /* From the GLSL 1.50.11 spec, section 4.3.7 ("Interface Blocks"):
 982     * "It is illegal to have an input block in a vertex shader
 983     *  or an output block in a fragment shader"
 984     */
 985    if ((state->stage == MESA_SHADER_VERTEX) && q.flags.q.in) {
 986       _mesa_glsl_error(locp, state,
 987                        "`in' interface block is not allowed for "
 988                        "a vertex shader");
 989    } else if ((state->stage == MESA_SHADER_FRAGMENT) && q.flags.q.out) {
 990       _mesa_glsl_error(locp, state,
 991                        "`out' interface block is not allowed for "
 992                        "a fragment shader");
 993    }
 994
 995    /* Since block arrays require names, and both features are added in
 996     * the same language versions, we don't have to explicitly
 997     * version-check both things.
 998     */
 999    if (block->instance_name != NULL) {
1000       state->check_version(150, 300, locp, "interface blocks with "
1001                            "an instance name are not allowed");
1002    }
1003
1004    uint64_t interface_type_mask;
1005    struct ast_type_qualifier temp_type_qualifier;
1006
1007    /* Get a bitmask containing only the in/out/uniform/buffer
1008     * flags, allowing us to ignore other irrelevant flags like
1009     * interpolation qualifiers.
1010     */
1011    temp_type_qualifier.flags.i = 0;
1012    temp_type_qualifier.flags.q.uniform = true;
1013    temp_type_qualifier.flags.q.in = true;
1014    temp_type_qualifier.flags.q.out = true;
1015    temp_type_qualifier.flags.q.buffer = true;
1016    temp_type_qualifier.flags.q.patch = true;
1017    interface_type_mask = temp_type_qualifier.flags.i;
1018
1019    /* Get the block's interface qualifier.  The interface_qualifier
1020     * production rule guarantees that only one bit will be set (and
1021     * it will be in/out/uniform).
1022     */
1023    uint64_t block_interface_qualifier = q.flags.i;
1024
1025    block->default_layout.flags.i |= block_interface_qualifier;
1026
1027    if (state->stage == MESA_SHADER_GEOMETRY &&
1028        state->has_explicit_attrib_stream() &&
1029        block->default_layout.flags.q.out) {
1030       /* Assign global layout's stream value. */
1031       block->default_layout.flags.q.stream = 1;
1032       block->default_layout.flags.q.explicit_stream = 0;
1033       block->default_layout.stream = state->out_qualifier->stream;
1034    }
1035
1036    if (state->has_enhanced_layouts() && block->default_layout.flags.q.out) {
1037       /* Assign global layout's xfb_buffer value. */
1038       block->default_layout.flags.q.xfb_buffer = 1;
1039       block->default_layout.flags.q.explicit_xfb_buffer = 0;
1040       block->default_layout.xfb_buffer = state->out_qualifier->xfb_buffer;
1041    }
1042
1043    foreach_list_typed (ast_declarator_list, member, link, &block->declarations) {
1044       ast_type_qualifier& qualifier = member->type->qualifier;
1045       if ((qualifier.flags.i & interface_type_mask) == 0) {
1046          /* GLSLangSpec.1.50.11, 4.3.7 (Interface Blocks):
1047           * "If no optional qualifier is used in a member declaration, the
1048           *  qualifier of the variable is just in, out, or uniform as declared
1049           *  by interface-qualifier."
1050           */
1051          qualifier.flags.i |= block_interface_qualifier;
1052       } else if ((qualifier.flags.i & interface_type_mask) !=
1053                  block_interface_qualifier) {
1054          /* GLSLangSpec.1.50.11, 4.3.7 (Interface Blocks):
1055           * "If optional qualifiers are used, they can include interpolation
1056           *  and storage qualifiers and they must declare an input, output,
1057           *  or uniform variable consistent with the interface qualifier of
1058           *  the block."
1059           */
1060          _mesa_glsl_error(locp, state,
1061                           "uniform/in/out qualifier on "
1062                           "interface block member does not match "
1063                           "the interface block");
1064       }
1065
1066       if (!(q.flags.q.in || q.flags.q.out) && qualifier.flags.q.invariant)
1067          _mesa_glsl_error(locp, state,
1068                           "invariant qualifiers can be used only "
1069                           "in interface block members for shader "
1070                           "inputs or outputs");
1071    }
1072 }
1073
1074 void
1075 _mesa_ast_type_qualifier_print(const struct ast_type_qualifier *q)
1076 {
1077    if (q->is_subroutine_decl())
1078       printf("subroutine ");
1079
1080    if (q->subroutine_list) {
1081       printf("subroutine (");
1082       q->subroutine_list->print();
1083       printf(")");
1084    }
1085
1086    if (q->flags.q.constant)
1087       printf("const ");
1088
1089    if (q->flags.q.invariant)
1090       printf("invariant ");
1091
1092    if (q->flags.q.attribute)
1093       printf("attribute ");
1094
1095    if (q->flags.q.varying)
1096       printf("varying ");
1097
1098    if (q->flags.q.in && q->flags.q.out)
1099       printf("inout ");
1100    else {
1101       if (q->flags.q.in)
1102          printf("in ");
1103
1104       if (q->flags.q.out)
1105          printf("out ");
1106    }
1107
1108    if (q->flags.q.centroid)
1109       printf("centroid ");
1110    if (q->flags.q.sample)
1111       printf("sample ");
1112    if (q->flags.q.patch)
1113       printf("patch ");
1114    if (q->flags.q.uniform)
1115       printf("uniform ");
1116    if (q->flags.q.buffer)
1117       printf("buffer ");
1118    if (q->flags.q.smooth)
1119       printf("smooth ");
1120    if (q->flags.q.flat)
1121       printf("flat ");
1122    if (q->flags.q.noperspective)
1123       printf("noperspective ");
1124 }
1125
1126
1127 void
1128 ast_node::print(void) const
1129 {
1130    printf("unhandled node ");
1131 }
1132
1133
1134 ast_node::ast_node(void)
1135 {
1136    this->location.source = 0;
1137    this->location.first_line = 0;
1138    this->location.first_column = 0;
1139    this->location.last_line = 0;
1140    this->location.last_column = 0;
1141 }
1142
1143
1144 static void
1145 ast_opt_array_dimensions_print(const ast_array_specifier *array_specifier)
1146 {
1147    if (array_specifier)
1148       array_specifier->print();
1149 }
1150
1151
1152 void
1153 ast_compound_statement::print(void) const
1154 {
1155    printf("{\n");
1156
1157    foreach_list_typed(ast_node, ast, link, &this->statements) {
1158       ast->print();
1159    }
1160
1161    printf("}\n");
1162 }
1163
1164
1165 ast_compound_statement::ast_compound_statement(int new_scope,
1166                                                ast_node *statements)
1167 {
1168    this->new_scope = new_scope;
1169
1170    if (statements != NULL) {
1171       this->statements.push_degenerate_list_at_head(&statements->link);
1172    }
1173 }
1174
1175
1176 void
1177 ast_expression::print(void) const
1178 {
1179    switch (oper) {
1180    case ast_assign:
1181    case ast_mul_assign:
1182    case ast_div_assign:
1183    case ast_mod_assign:
1184    case ast_add_assign:
1185    case ast_sub_assign:
1186    case ast_ls_assign:
1187    case ast_rs_assign:
1188    case ast_and_assign:
1189    case ast_xor_assign:
1190    case ast_or_assign:
1191       subexpressions[0]->print();
1192       printf("%s ", operator_string(oper));
1193       subexpressions[1]->print();
1194       break;
1195
1196    case ast_field_selection:
1197       subexpressions[0]->print();
1198       printf(". %s ", primary_expression.identifier);
1199       break;
1200
1201    case ast_plus:
1202    case ast_neg:
1203    case ast_bit_not:
1204    case ast_logic_not:
1205    case ast_pre_inc:
1206    case ast_pre_dec:
1207       printf("%s ", operator_string(oper));
1208       subexpressions[0]->print();
1209       break;
1210
1211    case ast_post_inc:
1212    case ast_post_dec:
1213       subexpressions[0]->print();
1214       printf("%s ", operator_string(oper));
1215       break;
1216
1217    case ast_conditional:
1218       subexpressions[0]->print();
1219       printf("? ");
1220       subexpressions[1]->print();
1221       printf(": ");
1222       subexpressions[2]->print();
1223       break;
1224
1225    case ast_array_index:
1226       subexpressions[0]->print();
1227       printf("[ ");
1228       subexpressions[1]->print();
1229       printf("] ");
1230       break;
1231
1232    case ast_function_call: {
1233       subexpressions[0]->print();
1234       printf("( ");
1235
1236       foreach_list_typed (ast_node, ast, link, &this->expressions) {
1237          if (&ast->link != this->expressions.get_head())
1238             printf(", ");
1239
1240          ast->print();
1241       }
1242
1243       printf(") ");
1244       break;
1245    }
1246
1247    case ast_identifier:
1248       printf("%s ", primary_expression.identifier);
1249       break;
1250
1251    case ast_int_constant:
1252       printf("%d ", primary_expression.int_constant);
1253       break;
1254
1255    case ast_uint_constant:
1256       printf("%u ", primary_expression.uint_constant);
1257       break;
1258
1259    case ast_float_constant:
1260       printf("%f ", primary_expression.float_constant);
1261       break;
1262
1263    case ast_double_constant:
1264       printf("%f ", primary_expression.double_constant);
1265       break;
1266
1267    case ast_int64_constant:
1268       printf("%" PRId64 " ", primary_expression.int64_constant);
1269       break;
1270
1271    case ast_uint64_constant:
1272       printf("%" PRIu64 " ", primary_expression.uint64_constant);
1273       break;
1274
1275    case ast_bool_constant:
1276       printf("%s ",
1277              primary_expression.bool_constant
1278              ? "true" : "false");
1279       break;
1280
1281    case ast_sequence: {
1282       printf("( ");
1283       foreach_list_typed (ast_node, ast, link, & this->expressions) {
1284          if (&ast->link != this->expressions.get_head())
1285             printf(", ");
1286
1287          ast->print();
1288       }
1289       printf(") ");
1290       break;
1291    }
1292
1293    case ast_aggregate: {
1294       printf("{ ");
1295       foreach_list_typed (ast_node, ast, link, & this->expressions) {
1296          if (&ast->link != this->expressions.get_head())
1297             printf(", ");
1298
1299          ast->print();
1300       }
1301       printf("} ");
1302       break;
1303    }
1304
1305    default:
1306       assert(0);
1307       break;
1308    }
1309 }
1310
1311 ast_expression::ast_expression(int oper,
1312                                ast_expression *ex0,
1313                                ast_expression *ex1,
1314                                ast_expression *ex2) :
1315    primary_expression()
1316 {
1317    this->oper = ast_operators(oper);
1318    this->subexpressions[0] = ex0;
1319    this->subexpressions[1] = ex1;
1320    this->subexpressions[2] = ex2;
1321    this->non_lvalue_description = NULL;
1322    this->is_lhs = false;
1323 }
1324
1325
1326 void
1327 ast_expression_statement::print(void) const
1328 {
1329    if (expression)
1330       expression->print();
1331
1332    printf("; ");
1333 }
1334
1335
1336 ast_expression_statement::ast_expression_statement(ast_expression *ex) :
1337    expression(ex)
1338 {
1339    /* empty */
1340 }
1341
1342
1343 void
1344 ast_function::print(void) const
1345 {
1346    return_type->print();
1347    printf(" %s (", identifier);
1348
1349    foreach_list_typed(ast_node, ast, link, & this->parameters) {
1350       ast->print();
1351    }
1352
1353    printf(")");
1354 }
1355
1356
1357 ast_function::ast_function(void)
1358    : return_type(NULL), identifier(NULL), is_definition(false),
1359      signature(NULL)
1360 {
1361    /* empty */
1362 }
1363
1364
1365 void
1366 ast_fully_specified_type::print(void) const
1367 {
1368    _mesa_ast_type_qualifier_print(& qualifier);
1369    specifier->print();
1370 }
1371
1372
1373 void
1374 ast_parameter_declarator::print(void) const
1375 {
1376    type->print();
1377    if (identifier)
1378       printf("%s ", identifier);
1379    ast_opt_array_dimensions_print(array_specifier);
1380 }
1381
1382
1383 void
1384 ast_function_definition::print(void) const
1385 {
1386    prototype->print();
1387    body->print();
1388 }
1389
1390
1391 void
1392 ast_declaration::print(void) const
1393 {
1394    printf("%s ", identifier);
1395    ast_opt_array_dimensions_print(array_specifier);
1396
1397    if (initializer) {
1398       printf("= ");
1399       initializer->print();
1400    }
1401 }
1402
1403
1404 ast_declaration::ast_declaration(const char *identifier,
1405                                  ast_array_specifier *array_specifier,
1406                                  ast_expression *initializer)
1407 {
1408    this->identifier = identifier;
1409    this->array_specifier = array_specifier;
1410    this->initializer = initializer;
1411 }
1412
1413
1414 void
1415 ast_declarator_list::print(void) const
1416 {
1417    assert(type || invariant);
1418
1419    if (type)
1420       type->print();
1421    else if (invariant)
1422       printf("invariant ");
1423    else
1424       printf("precise ");
1425
1426    foreach_list_typed (ast_node, ast, link, & this->declarations) {
1427       if (&ast->link != this->declarations.get_head())
1428          printf(", ");
1429
1430       ast->print();
1431    }
1432
1433    printf("; ");
1434 }
1435
1436
1437 ast_declarator_list::ast_declarator_list(ast_fully_specified_type *type)
1438 {
1439    this->type = type;
1440    this->invariant = false;
1441    this->precise = false;
1442 }
1443
1444 void
1445 ast_jump_statement::print(void) const
1446 {
1447    switch (mode) {
1448    case ast_continue:
1449       printf("continue; ");
1450       break;
1451    case ast_break:
1452       printf("break; ");
1453       break;
1454    case ast_return:
1455       printf("return ");
1456       if (opt_return_value)
1457          opt_return_value->print();
1458
1459       printf("; ");
1460       break;
1461    case ast_discard:
1462       printf("discard; ");
1463       break;
1464    }
1465 }
1466
1467
1468 ast_jump_statement::ast_jump_statement(int mode, ast_expression *return_value)
1469    : opt_return_value(NULL)
1470 {
1471    this->mode = ast_jump_modes(mode);
1472
1473    if (mode == ast_return)
1474       opt_return_value = return_value;
1475 }
1476
1477
1478 void
1479 ast_selection_statement::print(void) const
1480 {
1481    printf("if ( ");
1482    condition->print();
1483    printf(") ");
1484
1485    then_statement->print();
1486
1487    if (else_statement) {
1488       printf("else ");
1489       else_statement->print();
1490    }
1491 }
1492
1493
1494 ast_selection_statement::ast_selection_statement(ast_expression *condition,
1495                                                  ast_node *then_statement,
1496                                                  ast_node *else_statement)
1497 {
1498    this->condition = condition;
1499    this->then_statement = then_statement;
1500    this->else_statement = else_statement;
1501 }
1502
1503
1504 void
1505 ast_switch_statement::print(void) const
1506 {
1507    printf("switch ( ");
1508    test_expression->print();
1509    printf(") ");
1510
1511    body->print();
1512 }
1513
1514
1515 ast_switch_statement::ast_switch_statement(ast_expression *test_expression,
1516                                            ast_node *body)
1517 {
1518    this->test_expression = test_expression;
1519    this->body = body;
1520 }
1521
1522
1523 void
1524 ast_switch_body::print(void) const
1525 {
1526    printf("{\n");
1527    if (stmts != NULL) {
1528       stmts->print();
1529    }
1530    printf("}\n");
1531 }
1532
1533
1534 ast_switch_body::ast_switch_body(ast_case_statement_list *stmts)
1535 {
1536    this->stmts = stmts;
1537 }
1538
1539
1540 void ast_case_label::print(void) const
1541 {
1542    if (test_value != NULL) {
1543       printf("case ");
1544       test_value->print();
1545       printf(": ");
1546    } else {
1547       printf("default: ");
1548    }
1549 }
1550
1551
1552 ast_case_label::ast_case_label(ast_expression *test_value)
1553 {
1554    this->test_value = test_value;
1555 }
1556
1557
1558 void ast_case_label_list::print(void) const
1559 {
1560    foreach_list_typed(ast_node, ast, link, & this->labels) {
1561       ast->print();
1562    }
1563    printf("\n");
1564 }
1565
1566
1567 ast_case_label_list::ast_case_label_list(void)
1568 {
1569 }
1570
1571
1572 void ast_case_statement::print(void) const
1573 {
1574    labels->print();
1575    foreach_list_typed(ast_node, ast, link, & this->stmts) {
1576       ast->print();
1577       printf("\n");
1578    }
1579 }
1580
1581
1582 ast_case_statement::ast_case_statement(ast_case_label_list *labels)
1583 {
1584    this->labels = labels;
1585 }
1586
1587
1588 void ast_case_statement_list::print(void) const
1589 {
1590    foreach_list_typed(ast_node, ast, link, & this->cases) {
1591       ast->print();
1592    }
1593 }
1594
1595
1596 ast_case_statement_list::ast_case_statement_list(void)
1597 {
1598 }
1599
1600
1601 void
1602 ast_iteration_statement::print(void) const
1603 {
1604    switch (mode) {
1605    case ast_for:
1606       printf("for( ");
1607       if (init_statement)
1608          init_statement->print();
1609       printf("; ");
1610
1611       if (condition)
1612          condition->print();
1613       printf("; ");
1614
1615       if (rest_expression)
1616          rest_expression->print();
1617       printf(") ");
1618
1619       body->print();
1620       break;
1621
1622    case ast_while:
1623       printf("while ( ");
1624       if (condition)
1625          condition->print();
1626       printf(") ");
1627       body->print();
1628       break;
1629
1630    case ast_do_while:
1631       printf("do ");
1632       body->print();
1633       printf("while ( ");
1634       if (condition)
1635          condition->print();
1636       printf("); ");
1637       break;
1638    }
1639 }
1640
1641
1642 ast_iteration_statement::ast_iteration_statement(int mode,
1643                                                  ast_node *init,
1644                                                  ast_node *condition,
1645                                                  ast_expression *rest_expression,
1646                                                  ast_node *body)
1647 {
1648    this->mode = ast_iteration_modes(mode);
1649    this->init_statement = init;
1650    this->condition = condition;
1651    this->rest_expression = rest_expression;
1652    this->body = body;
1653 }
1654
1655
1656 void
1657 ast_struct_specifier::print(void) const
1658 {
1659    printf("struct %s { ", name);
1660    foreach_list_typed(ast_node, ast, link, &this->declarations) {
1661       ast->print();
1662    }
1663    printf("} ");
1664 }
1665
1666
1667 ast_struct_specifier::ast_struct_specifier(void *lin_ctx, const char *identifier,
1668                                            ast_declarator_list *declarator_list)
1669 {
1670    if (identifier == NULL) {
1671       static mtx_t mutex = _MTX_INITIALIZER_NP;
1672       static unsigned anon_count = 1;
1673       unsigned count;
1674
1675       mtx_lock(&mutex);
1676       count = anon_count++;
1677       mtx_unlock(&mutex);
1678
1679       identifier = linear_asprintf(lin_ctx, "#anon_struct_%04x", count);
1680    }
1681    name = identifier;
1682    this->declarations.push_degenerate_list_at_head(&declarator_list->link);
1683    is_declaration = true;
1684    layout = NULL;
1685 }
1686
1687 void ast_subroutine_list::print(void) const
1688 {
1689    foreach_list_typed (ast_node, ast, link, & this->declarations) {
1690       if (&ast->link != this->declarations.get_head())
1691          printf(", ");
1692       ast->print();
1693    }
1694 }
1695
1696 static void
1697 set_shader_inout_layout(struct gl_shader *shader,
1698                      struct _mesa_glsl_parse_state *state)
1699 {
1700    /* Should have been prevented by the parser. */
1701    if (shader->Stage == MESA_SHADER_TESS_CTRL ||
1702        shader->Stage == MESA_SHADER_VERTEX) {
1703       assert(!state->in_qualifier->flags.i);
1704    } else if (shader->Stage != MESA_SHADER_GEOMETRY &&
1705               shader->Stage != MESA_SHADER_TESS_EVAL) {
1706       assert(!state->in_qualifier->flags.i);
1707    }
1708
1709    if (shader->Stage != MESA_SHADER_COMPUTE) {
1710       /* Should have been prevented by the parser. */
1711       assert(!state->cs_input_local_size_specified);
1712       assert(!state->cs_input_local_size_variable_specified);
1713    }
1714
1715    if (shader->Stage != MESA_SHADER_FRAGMENT) {
1716       /* Should have been prevented by the parser. */
1717       assert(!state->fs_uses_gl_fragcoord);
1718       assert(!state->fs_redeclares_gl_fragcoord);
1719       assert(!state->fs_pixel_center_integer);
1720       assert(!state->fs_origin_upper_left);
1721       assert(!state->fs_early_fragment_tests);
1722       assert(!state->fs_inner_coverage);
1723       assert(!state->fs_post_depth_coverage);
1724    }
1725
1726    for (unsigned i = 0; i < MAX_FEEDBACK_BUFFERS; i++) {
1727       if (state->out_qualifier->out_xfb_stride[i]) {
1728          unsigned xfb_stride;
1729          if (state->out_qualifier->out_xfb_stride[i]->
1730                 process_qualifier_constant(state, "xfb_stride", &xfb_stride,
1731                 true)) {
1732             shader->TransformFeedbackBufferStride[i] = xfb_stride;
1733          }
1734       }
1735    }
1736
1737    switch (shader->Stage) {
1738    case MESA_SHADER_TESS_CTRL:
1739       shader->info.TessCtrl.VerticesOut = 0;
1740       if (state->tcs_output_vertices_specified) {
1741          unsigned vertices;
1742          if (state->out_qualifier->vertices->
1743                process_qualifier_constant(state, "vertices", &vertices,
1744                                           false)) {
1745
1746             YYLTYPE loc = state->out_qualifier->vertices->get_location();
1747             if (vertices > state->Const.MaxPatchVertices) {
1748                _mesa_glsl_error(&loc, state, "vertices (%d) exceeds "
1749                                 "GL_MAX_PATCH_VERTICES", vertices);
1750             }
1751             shader->info.TessCtrl.VerticesOut = vertices;
1752          }
1753       }
1754       break;
1755    case MESA_SHADER_TESS_EVAL:
1756       shader->info.TessEval.PrimitiveMode = PRIM_UNKNOWN;
1757       if (state->in_qualifier->flags.q.prim_type)
1758          shader->info.TessEval.PrimitiveMode = state->in_qualifier->prim_type;
1759
1760       shader->info.TessEval.Spacing = TESS_SPACING_UNSPECIFIED;
1761       if (state->in_qualifier->flags.q.vertex_spacing)
1762          shader->info.TessEval.Spacing = state->in_qualifier->vertex_spacing;
1763
1764       shader->info.TessEval.VertexOrder = 0;
1765       if (state->in_qualifier->flags.q.ordering)
1766          shader->info.TessEval.VertexOrder = state->in_qualifier->ordering;
1767
1768       shader->info.TessEval.PointMode = -1;
1769       if (state->in_qualifier->flags.q.point_mode)
1770          shader->info.TessEval.PointMode = state->in_qualifier->point_mode;
1771       break;
1772    case MESA_SHADER_GEOMETRY:
1773       shader->info.Geom.VerticesOut = -1;
1774       if (state->out_qualifier->flags.q.max_vertices) {
1775          unsigned qual_max_vertices;
1776          if (state->out_qualifier->max_vertices->
1777                process_qualifier_constant(state, "max_vertices",
1778                                           &qual_max_vertices, true)) {
1779
1780             if (qual_max_vertices > state->Const.MaxGeometryOutputVertices) {
1781                YYLTYPE loc = state->out_qualifier->max_vertices->get_location();
1782                _mesa_glsl_error(&loc, state,
1783                                 "maximum output vertices (%d) exceeds "
1784                                 "GL_MAX_GEOMETRY_OUTPUT_VERTICES",
1785                                 qual_max_vertices);
1786             }
1787             shader->info.Geom.VerticesOut = qual_max_vertices;
1788          }
1789       }
1790
1791       if (state->gs_input_prim_type_specified) {
1792          shader->info.Geom.InputType = state->in_qualifier->prim_type;
1793       } else {
1794          shader->info.Geom.InputType = PRIM_UNKNOWN;
1795       }
1796
1797       if (state->out_qualifier->flags.q.prim_type) {
1798          shader->info.Geom.OutputType = state->out_qualifier->prim_type;
1799       } else {
1800          shader->info.Geom.OutputType = PRIM_UNKNOWN;
1801       }
1802
1803       shader->info.Geom.Invocations = 0;
1804       if (state->in_qualifier->flags.q.invocations) {
1805          unsigned invocations;
1806          if (state->in_qualifier->invocations->
1807                process_qualifier_constant(state, "invocations",
1808                                           &invocations, false)) {
1809
1810             YYLTYPE loc = state->in_qualifier->invocations->get_location();
1811             if (invocations > MAX_GEOMETRY_SHADER_INVOCATIONS) {
1812                _mesa_glsl_error(&loc, state,
1813                                 "invocations (%d) exceeds "
1814                                 "GL_MAX_GEOMETRY_SHADER_INVOCATIONS",
1815                                 invocations);
1816             }
1817             shader->info.Geom.Invocations = invocations;
1818          }
1819       }
1820       break;
1821
1822    case MESA_SHADER_COMPUTE:
1823       if (state->cs_input_local_size_specified) {
1824          for (int i = 0; i < 3; i++)
1825             shader->info.Comp.LocalSize[i] = state->cs_input_local_size[i];
1826       } else {
1827          for (int i = 0; i < 3; i++)
1828             shader->info.Comp.LocalSize[i] = 0;
1829       }
1830
1831       shader->info.Comp.LocalSizeVariable =
1832          state->cs_input_local_size_variable_specified;
1833       break;
1834
1835    case MESA_SHADER_FRAGMENT:
1836       shader->redeclares_gl_fragcoord = state->fs_redeclares_gl_fragcoord;
1837       shader->uses_gl_fragcoord = state->fs_uses_gl_fragcoord;
1838       shader->pixel_center_integer = state->fs_pixel_center_integer;
1839       shader->origin_upper_left = state->fs_origin_upper_left;
1840       shader->ARB_fragment_coord_conventions_enable =
1841          state->ARB_fragment_coord_conventions_enable;
1842       shader->EarlyFragmentTests = state->fs_early_fragment_tests;
1843       shader->InnerCoverage = state->fs_inner_coverage;
1844       shader->PostDepthCoverage = state->fs_post_depth_coverage;
1845       shader->BlendSupport = state->fs_blend_support;
1846       break;
1847
1848    default:
1849       /* Nothing to do. */
1850       break;
1851    }
1852 }
1853
1854 extern "C" {
1855
1856 static void
1857 assign_subroutine_indexes(struct gl_shader *sh,
1858                           struct _mesa_glsl_parse_state *state)
1859 {
1860    int j, k;
1861    int index = 0;
1862
1863    for (j = 0; j < state->num_subroutines; j++) {
1864       while (state->subroutines[j]->subroutine_index == -1) {
1865          for (k = 0; k < state->num_subroutines; k++) {
1866             if (state->subroutines[k]->subroutine_index == index)
1867                break;
1868             else if (k == state->num_subroutines - 1) {
1869                state->subroutines[j]->subroutine_index = index;
1870             }
1871          }
1872          index++;
1873       }
1874    }
1875 }
1876
1877 static void
1878 add_builtin_defines(struct _mesa_glsl_parse_state *state,
1879                     void (*add_builtin_define)(struct glcpp_parser *, const char *, int),
1880                     struct glcpp_parser *data,
1881                     unsigned version,
1882                     bool es)
1883 {
1884    unsigned gl_version = state->ctx->Extensions.Version;
1885    gl_api api = state->ctx->API;
1886
1887    if (gl_version != 0xff) {
1888       unsigned i;
1889       for (i = 0; i < state->num_supported_versions; i++) {
1890          if (state->supported_versions[i].ver == version &&
1891              state->supported_versions[i].es == es) {
1892             gl_version = state->supported_versions[i].gl_ver;
1893             break;
1894          }
1895       }
1896
1897       if (i == state->num_supported_versions)
1898          return;
1899    }
1900
1901    if (es)
1902       api = API_OPENGLES2;
1903
1904    for (unsigned i = 0;
1905         i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
1906       const _mesa_glsl_extension *extension
1907          = &_mesa_glsl_supported_extensions[i];
1908       if (extension->compatible_with_state(state, api, gl_version)) {
1909          add_builtin_define(data, extension->name, 1);
1910       }
1911    }
1912 }
1913
1914 /* Implements parsing checks that we can't do during parsing */
1915 static void
1916 do_late_parsing_checks(struct _mesa_glsl_parse_state *state)
1917 {
1918    if (state->stage == MESA_SHADER_COMPUTE && !state->has_compute_shader()) {
1919       YYLTYPE loc;
1920       memset(&loc, 0, sizeof(loc));
1921       _mesa_glsl_error(&loc, state, "Compute shaders require "
1922                        "GLSL 4.30 or GLSL ES 3.10");
1923    }
1924 }
1925
1926 static void
1927 opt_shader_and_create_symbol_table(struct gl_context *ctx,
1928                                    struct gl_shader *shader)
1929 {
1930    assert(shader->CompileStatus != compile_failure &&
1931           !shader->ir->is_empty());
1932
1933    struct gl_shader_compiler_options *options =
1934       &ctx->Const.ShaderCompilerOptions[shader->Stage];
1935
1936    /* Do some optimization at compile time to reduce shader IR size
1937     * and reduce later work if the same shader is linked multiple times
1938     */
1939    if (ctx->Const.GLSLOptimizeConservatively) {
1940       /* Run it just once. */
1941       do_common_optimization(shader->ir, false, false, options,
1942                              ctx->Const.NativeIntegers);
1943    } else {
1944       /* Repeat it until it stops making changes. */
1945       while (do_common_optimization(shader->ir, false, false, options,
1946                                     ctx->Const.NativeIntegers))
1947          ;
1948    }
1949
1950    validate_ir_tree(shader->ir);
1951
1952    enum ir_variable_mode other;
1953    switch (shader->Stage) {
1954    case MESA_SHADER_VERTEX:
1955       other = ir_var_shader_in;
1956       break;
1957    case MESA_SHADER_FRAGMENT:
1958       other = ir_var_shader_out;
1959       break;
1960    default:
1961       /* Something invalid to ensure optimize_dead_builtin_uniforms
1962        * doesn't remove anything other than uniforms or constants.
1963        */
1964       other = ir_var_mode_count;
1965       break;
1966    }
1967
1968    optimize_dead_builtin_variables(shader->ir, other);
1969
1970    validate_ir_tree(shader->ir);
1971
1972    /* Retain any live IR, but trash the rest. */
1973    reparent_ir(shader->ir, shader->ir);
1974
1975    /* Destroy the symbol table.  Create a new symbol table that contains only
1976     * the variables and functions that still exist in the IR.  The symbol
1977     * table will be used later during linking.
1978     *
1979     * There must NOT be any freed objects still referenced by the symbol
1980     * table.  That could cause the linker to dereference freed memory.
1981     *
1982     * We don't have to worry about types or interface-types here because those
1983     * are fly-weights that are looked up by glsl_type.
1984     */
1985    foreach_in_list (ir_instruction, ir, shader->ir) {
1986       switch (ir->ir_type) {
1987       case ir_type_function:
1988          shader->symbols->add_function((ir_function *) ir);
1989          break;
1990       case ir_type_variable: {
1991          ir_variable *const var = (ir_variable *) ir;
1992
1993          if (var->data.mode != ir_var_temporary)
1994             shader->symbols->add_variable(var);
1995          break;
1996       }
1997       default:
1998          break;
1999       }
2000    }
2001
2002    _mesa_glsl_initialize_derived_variables(ctx, shader);
2003 }
2004
2005 void
2006 _mesa_glsl_compile_shader(struct gl_context *ctx, struct gl_shader *shader,
2007                           bool dump_ast, bool dump_hir, bool force_recompile)
2008 {
2009    const char *source = force_recompile && shader->FallbackSource ?
2010       shader->FallbackSource : shader->Source;
2011
2012    if (!force_recompile) {
2013       if (ctx->Cache) {
2014          char buf[41];
2015          disk_cache_compute_key(ctx->Cache, source, strlen(source),
2016                                 shader->sha1);
2017          if (disk_cache_has_key(ctx->Cache, shader->sha1)) {
2018             /* We've seen this shader before and know it compiles */
2019             if (ctx->_Shader->Flags & GLSL_CACHE_INFO) {
2020                _mesa_sha1_format(buf, shader->sha1);
2021                fprintf(stderr, "deferring compile of shader: %s\n", buf);
2022             }
2023             shader->CompileStatus = compile_skipped;
2024
2025             free((void *)shader->FallbackSource);
2026             shader->FallbackSource = NULL;
2027             return;
2028          }
2029       }
2030    } else {
2031       /* We should only ever end up here if a re-compile has been forced by a
2032        * shader cache miss. In which case we can skip the compile if its
2033        * already be done by a previous fallback or the initial compile call.
2034        */
2035       if (shader->CompileStatus == compile_success)
2036          return;
2037
2038       if (shader->CompileStatus == compiled_no_opts) {
2039          opt_shader_and_create_symbol_table(ctx, shader);
2040          shader->CompileStatus = compile_success;
2041          return;
2042       }
2043    }
2044
2045    struct _mesa_glsl_parse_state *state =
2046       new(shader) _mesa_glsl_parse_state(ctx, shader->Stage, shader);
2047
2048    if (ctx->Const.GenerateTemporaryNames)
2049       (void) p_atomic_cmpxchg(&ir_variable::temporaries_allocate_names,
2050                               false, true);
2051
2052    state->error = glcpp_preprocess(state, &source, &state->info_log,
2053                                    add_builtin_defines, state, ctx);
2054
2055    if (!state->error) {
2056      _mesa_glsl_lexer_ctor(state, source);
2057      _mesa_glsl_parse(state);
2058      _mesa_glsl_lexer_dtor(state);
2059      do_late_parsing_checks(state);
2060    }
2061
2062    if (dump_ast) {
2063       foreach_list_typed(ast_node, ast, link, &state->translation_unit) {
2064          ast->print();
2065       }
2066       printf("\n\n");
2067    }
2068
2069    ralloc_free(shader->ir);
2070    shader->ir = new(shader) exec_list;
2071    if (!state->error && !state->translation_unit.is_empty())
2072       _mesa_ast_to_hir(shader->ir, state);
2073
2074    if (!state->error) {
2075       validate_ir_tree(shader->ir);
2076
2077       /* Print out the unoptimized IR. */
2078       if (dump_hir) {
2079          _mesa_print_ir(stdout, shader->ir, state);
2080       }
2081    }
2082
2083    if (shader->InfoLog)
2084       ralloc_free(shader->InfoLog);
2085
2086    if (!state->error)
2087       set_shader_inout_layout(shader, state);
2088
2089    shader->symbols = new(shader->ir) glsl_symbol_table;
2090    shader->CompileStatus = state->error ? compile_failure : compile_success;
2091    shader->InfoLog = state->info_log;
2092    shader->Version = state->language_version;
2093    shader->IsES = state->es_shader;
2094
2095    if (!state->error && !shader->ir->is_empty()) {
2096       assign_subroutine_indexes(shader, state);
2097       lower_subroutine(shader->ir, state);
2098
2099       if (!ctx->Cache || force_recompile)
2100          opt_shader_and_create_symbol_table(ctx, shader);
2101       else {
2102          reparent_ir(shader->ir, shader->ir);
2103          shader->CompileStatus = compiled_no_opts;
2104       }
2105    }
2106
2107    if (!force_recompile) {
2108       free((void *)shader->FallbackSource);
2109       shader->FallbackSource = NULL;
2110    }
2111
2112    delete state->symbols;
2113    ralloc_free(state);
2114 }
2115
2116 } /* extern "C" */
2117 /**
2118  * Do the set of common optimizations passes
2119  *
2120  * \param ir                          List of instructions to be optimized
2121  * \param linked                      Is the shader linked?  This enables
2122  *                                    optimizations passes that remove code at
2123  *                                    global scope and could cause linking to
2124  *                                    fail.
2125  * \param uniform_locations_assigned  Have locations already been assigned for
2126  *                                    uniforms?  This prevents the declarations
2127  *                                    of unused uniforms from being removed.
2128  *                                    The setting of this flag only matters if
2129  *                                    \c linked is \c true.
2130  * \param options                     The driver's preferred shader options.
2131  * \param native_integers             Selects optimizations that depend on the
2132  *                                    implementations supporting integers
2133  *                                    natively (as opposed to supporting
2134  *                                    integers in floating point registers).
2135  */
2136 bool
2137 do_common_optimization(exec_list *ir, bool linked,
2138                        bool uniform_locations_assigned,
2139                        const struct gl_shader_compiler_options *options,
2140                        bool native_integers)
2141 {
2142    const bool debug = false;
2143    GLboolean progress = GL_FALSE;
2144
2145 #define OPT(PASS, ...) do {                                             \
2146       if (debug) {                                                      \
2147          fprintf(stderr, "START GLSL optimization %s\n", #PASS);        \
2148          const bool opt_progress = PASS(__VA_ARGS__);                   \
2149          progress = opt_progress || progress;                           \
2150          if (opt_progress)                                              \
2151             _mesa_print_ir(stderr, ir, NULL);                           \
2152          fprintf(stderr, "GLSL optimization %s: %s progress\n",         \
2153                  #PASS, opt_progress ? "made" : "no");                  \
2154       } else {                                                          \
2155          progress = PASS(__VA_ARGS__) || progress;                      \
2156       }                                                                 \
2157    } while (false)
2158
2159    OPT(lower_instructions, ir, SUB_TO_ADD_NEG);
2160
2161    if (linked) {
2162       OPT(do_function_inlining, ir);
2163       OPT(do_dead_functions, ir);
2164       OPT(do_structure_splitting, ir);
2165    }
2166    propagate_invariance(ir);
2167    OPT(do_if_simplification, ir);
2168    OPT(opt_flatten_nested_if_blocks, ir);
2169    OPT(opt_conditional_discard, ir);
2170    OPT(do_copy_propagation, ir);
2171    OPT(do_copy_propagation_elements, ir);
2172
2173    if (options->OptimizeForAOS && !linked)
2174       OPT(opt_flip_matrices, ir);
2175
2176    if (linked && options->OptimizeForAOS) {
2177       OPT(do_vectorize, ir);
2178    }
2179
2180    if (linked)
2181       OPT(do_dead_code, ir, uniform_locations_assigned);
2182    else
2183       OPT(do_dead_code_unlinked, ir);
2184    OPT(do_dead_code_local, ir);
2185    OPT(do_tree_grafting, ir);
2186    OPT(do_constant_propagation, ir);
2187    if (linked)
2188       OPT(do_constant_variable, ir);
2189    else
2190       OPT(do_constant_variable_unlinked, ir);
2191    OPT(do_constant_folding, ir);
2192    OPT(do_minmax_prune, ir);
2193    OPT(do_rebalance_tree, ir);
2194    OPT(do_algebraic, ir, native_integers, options);
2195    OPT(do_lower_jumps, ir, true, true, options->EmitNoMainReturn,
2196        options->EmitNoCont, options->EmitNoLoops);
2197    OPT(do_vec_index_to_swizzle, ir);
2198    OPT(lower_vector_insert, ir, false);
2199    OPT(do_swizzle_swizzle, ir);
2200    OPT(do_noop_swizzle, ir);
2201
2202    OPT(optimize_split_arrays, ir, linked);
2203    OPT(optimize_redundant_jumps, ir);
2204
2205    if (options->MaxUnrollIterations) {
2206       loop_state *ls = analyze_loop_variables(ir);
2207       if (ls->loop_found) {
2208          OPT(set_loop_controls, ir, ls);
2209          OPT(unroll_loops, ir, ls, options);
2210       }
2211       delete ls;
2212    }
2213
2214 #undef OPT
2215
2216    return progress;
2217 }
2218
2219 extern "C" {
2220
2221 /**
2222  * To be called at GL teardown time, this frees compiler datastructures.
2223  *
2224  * After calling this, any previously compiled shaders and shader
2225  * programs would be invalid.  So this should happen at approximately
2226  * program exit.
2227  */
2228 void
2229 _mesa_destroy_shader_compiler(void)
2230 {
2231    _mesa_destroy_shader_compiler_caches();
2232
2233    _mesa_glsl_release_types();
2234 }
2235
2236 /**
2237  * Releases compiler caches to trade off performance for memory.
2238  *
2239  * Intended to be used with glReleaseShaderCompiler().
2240  */
2241 void
2242 _mesa_destroy_shader_compiler_caches(void)
2243 {
2244    _mesa_glsl_release_builtin_functions();
2245 }
2246
2247 }