glslang/MachineIndependent/Scan.cpp

   1 //
   2 // Copyright (C) 2002-2005  3Dlabs Inc. Ltd.
   3 // Copyright (C) 2013 LunarG, Inc.
   4 // Copyright (C) 2017 ARM Limited.
   5 // Copyright (C) 2020 Google, Inc.
   6 //
   7 // All rights reserved.
   8 //
   9 // Redistribution and use in source and binary forms, with or without
  10 // modification, are permitted provided that the following conditions
  11 // are met:
  12 //
  13 //    Redistributions of source code must retain the above copyright
  14 //    notice, this list of conditions and the following disclaimer.
  15 //
  16 //    Redistributions in binary form must reproduce the above
  17 //    copyright notice, this list of conditions and the following
  18 //    disclaimer in the documentation and/or other materials provided
  19 //    with the distribution.
  20 //
  21 //    Neither the name of 3Dlabs Inc. Ltd. nor the names of its
  22 //    contributors may be used to endorse or promote products derived
  23 //    from this software without specific prior written permission.
  24 //
  25 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  26 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  27 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  28 // FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  29 // COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  30 // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  31 // BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  32 // LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  33 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  35 // ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  36 // POSSIBILITY OF SUCH DAMAGE.
  37 //
  38
  39 //
  40 // GLSL scanning, leveraging the scanning done by the preprocessor.
  41 //
  42
  43 #include <cstring>
  44 #include <unordered_map>
  45 #include <unordered_set>
  46
  47 #include "../Include/Types.h"
  48 #include "SymbolTable.h"
  49 #include "ParseHelper.h"
  50 #include "attribute.h"
  51 #include "glslang_tab.cpp.h"
  52 #include "ScanContext.h"
  53 #include "Scan.h"
  54
  55 // preprocessor includes
  56 #include "preprocessor/PpContext.h"
  57 #include "preprocessor/PpTokens.h"
  58
  59 // Required to avoid missing prototype warnings for some compilers
  60 int yylex(YYSTYPE*, glslang::TParseContext&);
  61
  62 namespace glslang {
  63
  64 // read past any white space
  65 void TInputScanner::consumeWhiteSpace(bool& foundNonSpaceTab)
  66 {
  67     int c = peek();  // don't accidentally consume anything other than whitespace
  68     while (c == ' ' || c == '\t' || c == '\r' || c == '\n') {
  69         if (c == '\r' || c == '\n')
  70             foundNonSpaceTab = true;
  71         get();
  72         c = peek();
  73     }
  74 }
  75
  76 // return true if a comment was actually consumed
  77 bool TInputScanner::consumeComment()
  78 {
  79     if (peek() != '/')
  80         return false;
  81
  82     get();  // consume the '/'
  83     int c = peek();
  84     if (c == '/') {
  85
  86         // a '//' style comment
  87         get();  // consume the second '/'
  88         c = get();
  89         do {
  90             while (c != EndOfInput && c != '\\' && c != '\r' && c != '\n')
  91                 c = get();
  92
  93             if (c == EndOfInput || c == '\r' || c == '\n') {
  94                 while (c == '\r' || c == '\n')
  95                     c = get();
  96
  97                 // we reached the end of the comment
  98                 break;
  99             } else {
 100                 // it's a '\', so we need to keep going, after skipping what's escaped
 101
 102                 // read the skipped character
 103                 c = get();
 104
 105                 // if it's a two-character newline, skip both characters
 106                 if (c == '\r' && peek() == '\n')
 107                     get();
 108                 c = get();
 109             }
 110         } while (true);
 111
 112         // put back the last non-comment character
 113         if (c != EndOfInput)
 114             unget();
 115
 116         return true;
 117     } else if (c == '*') {
 118
 119         // a '/*' style comment
 120         get();  // consume the '*'
 121         c = get();
 122         do {
 123             while (c != EndOfInput && c != '*')
 124                 c = get();
 125             if (c == '*') {
 126                 c = get();
 127                 if (c == '/')
 128                     break;  // end of comment
 129                 // not end of comment
 130             } else // end of input
 131                 break;
 132         } while (true);
 133
 134         return true;
 135     } else {
 136         // it's not a comment, put the '/' back
 137         unget();
 138
 139         return false;
 140     }
 141 }
 142
 143 // skip whitespace, then skip a comment, rinse, repeat
 144 void TInputScanner::consumeWhitespaceComment(bool& foundNonSpaceTab)
 145 {
 146     do {
 147         consumeWhiteSpace(foundNonSpaceTab);
 148
 149         // if not starting a comment now, then done
 150         int c = peek();
 151         if (c != '/' || c == EndOfInput)
 152             return;
 153
 154         // skip potential comment
 155         foundNonSpaceTab = true;
 156         if (! consumeComment())
 157             return;
 158
 159     } while (true);
 160 }
 161
 162 // Returns true if there was non-white space (e.g., a comment, newline) before the #version
 163 // or no #version was found; otherwise, returns false.  There is no error case, it always
 164 // succeeds, but will leave version == 0 if no #version was found.
 165 //
 166 // Sets notFirstToken based on whether tokens (beyond white space and comments)
 167 // appeared before the #version.
 168 //
 169 // N.B. does not attempt to leave input in any particular known state.  The assumption
 170 // is that scanning will start anew, following the rules for the chosen version/profile,
 171 // and with a corresponding parsing context.
 172 //
 173 bool TInputScanner::scanVersion(int& version, EProfile& profile, bool& notFirstToken)
 174 {
 175     // This function doesn't have to get all the semantics correct,
 176     // just find the #version if there is a correct one present.
 177     // The preprocessor will have the responsibility of getting all the semantics right.
 178
 179     bool versionNotFirst = false;  // means not first WRT comments and white space, nothing more
 180     notFirstToken = false;         // means not first WRT to real tokens
 181     version = 0;                   // means not found
 182     profile = ENoProfile;
 183
 184     bool foundNonSpaceTab = false;
 185     bool lookingInMiddle = false;
 186     int c;
 187     do {
 188         if (lookingInMiddle) {
 189             notFirstToken = true;
 190             // make forward progress by finishing off the current line plus extra new lines
 191             if (peek() != '\n' && peek() != '\r') {
 192                 do {
 193                     c = get();
 194                 } while (c != EndOfInput && c != '\n' && c != '\r');
 195             }
 196             while (peek() == '\n' || peek() == '\r')
 197                 get();
 198             if (peek() == EndOfInput)
 199                 return true;
 200         }
 201         lookingInMiddle = true;
 202
 203         // Nominal start, skipping the desktop allowed comments and white space, but tracking if
 204         // something else was found for ES:
 205         consumeWhitespaceComment(foundNonSpaceTab);
 206         if (foundNonSpaceTab)
 207             versionNotFirst = true;
 208
 209         // "#"
 210         if (get() != '#') {
 211             versionNotFirst = true;
 212             continue;
 213         }
 214
 215         // whitespace
 216         do {
 217             c = get();
 218         } while (c == ' ' || c == '\t');
 219
 220         // "version"
 221         if (    c != 'v' ||
 222             get() != 'e' ||
 223             get() != 'r' ||
 224             get() != 's' ||
 225             get() != 'i' ||
 226             get() != 'o' ||
 227             get() != 'n') {
 228             versionNotFirst = true;
 229             continue;
 230         }
 231
 232         // whitespace
 233         do {
 234             c = get();
 235         } while (c == ' ' || c == '\t');
 236
 237         // version number
 238         while (c >= '0' && c <= '9') {
 239             version = 10 * version + (c - '0');
 240             c = get();
 241         }
 242         if (version == 0) {
 243             versionNotFirst = true;
 244             continue;
 245         }
 246
 247         // whitespace
 248         while (c == ' ' || c == '\t')
 249             c = get();
 250
 251         // profile
 252         const int maxProfileLength = 13;  // not including any 0
 253         char profileString[maxProfileLength];
 254         int profileLength;
 255         for (profileLength = 0; profileLength < maxProfileLength; ++profileLength) {
 256             if (c == EndOfInput || c == ' ' || c == '\t' || c == '\n' || c == '\r')
 257                 break;
 258             profileString[profileLength] = (char)c;
 259             c = get();
 260         }
 261         if (c != EndOfInput && c != ' ' && c != '\t' && c != '\n' && c != '\r') {
 262             versionNotFirst = true;
 263             continue;
 264         }
 265
 266         if (profileLength == 2 && strncmp(profileString, "es", profileLength) == 0)
 267             profile = EEsProfile;
 268         else if (profileLength == 4 && strncmp(profileString, "core", profileLength) == 0)
 269             profile = ECoreProfile;
 270         else if (profileLength == 13 && strncmp(profileString, "compatibility", profileLength) == 0)
 271             profile = ECompatibilityProfile;
 272
 273         return versionNotFirst;
 274     } while (true);
 275 }
 276
 277 // Fill this in when doing glslang-level scanning, to hand back to the parser.
 278 class TParserToken {
 279 public:
 280     explicit TParserToken(YYSTYPE& b) : sType(b) { }
 281
 282     YYSTYPE& sType;
 283 protected:
 284     TParserToken(TParserToken&);
 285     TParserToken& operator=(TParserToken&);
 286 };
 287
 288 } // end namespace glslang
 289
 290 // This is the function the glslang parser (i.e., bison) calls to get its next token
 291 int yylex(YYSTYPE* glslangTokenDesc, glslang::TParseContext& parseContext)
 292 {
 293     glslang::TParserToken token(*glslangTokenDesc);
 294
 295     return parseContext.getScanContext()->tokenize(parseContext.getPpContext(), token);
 296 }
 297
 298 namespace {
 299
 300 struct str_eq
 301 {
 302     bool operator()(const char* lhs, const char* rhs) const
 303     {
 304         return strcmp(lhs, rhs) == 0;
 305     }
 306 };
 307
 308 struct str_hash
 309 {
 310     size_t operator()(const char* str) const
 311     {
 312         // djb2
 313         unsigned long hash = 5381;
 314         int c;
 315
 316         while ((c = *str++) != 0)
 317             hash = ((hash << 5) + hash) + c;
 318
 319         return hash;
 320     }
 321 };
 322
 323 // A single global usable by all threads, by all versions, by all languages.
 324 // After a single process-level initialization, this is read only and thread safe
 325 std::unordered_map<const char*, int, str_hash, str_eq>* KeywordMap = nullptr;
 326 #ifndef GLSLANG_WEB
 327 std::unordered_set<const char*, str_hash, str_eq>* ReservedSet = nullptr;
 328 #endif
 329
 330 };
 331
 332 namespace glslang {
 333
 334 void TScanContext::fillInKeywordMap()
 335 {
 336     if (KeywordMap != nullptr) {
 337         // this is really an error, as this should called only once per process
 338         // but, the only risk is if two threads called simultaneously
 339         return;
 340     }
 341     KeywordMap = new std::unordered_map<const char*, int, str_hash, str_eq>;
 342
 343     (*KeywordMap)["const"] =                   CONST;
 344     (*KeywordMap)["uniform"] =                 UNIFORM;
 345     (*KeywordMap)["buffer"] =                  BUFFER;
 346     (*KeywordMap)["in"] =                      IN;
 347     (*KeywordMap)["out"] =                     OUT;
 348     (*KeywordMap)["smooth"] =                  SMOOTH;
 349     (*KeywordMap)["flat"] =                    FLAT;
 350     (*KeywordMap)["centroid"] =                CENTROID;
 351     (*KeywordMap)["invariant"] =               INVARIANT;
 352     (*KeywordMap)["packed"] =                  PACKED;
 353     (*KeywordMap)["resource"] =                RESOURCE;
 354     (*KeywordMap)["inout"] =                   INOUT;
 355     (*KeywordMap)["struct"] =                  STRUCT;
 356     (*KeywordMap)["break"] =                   BREAK;
 357     (*KeywordMap)["continue"] =                CONTINUE;
 358     (*KeywordMap)["do"] =                      DO;
 359     (*KeywordMap)["for"] =                     FOR;
 360     (*KeywordMap)["while"] =                   WHILE;
 361     (*KeywordMap)["switch"] =                  SWITCH;
 362     (*KeywordMap)["case"] =                    CASE;
 363     (*KeywordMap)["default"] =                 DEFAULT;
 364     (*KeywordMap)["if"] =                      IF;
 365     (*KeywordMap)["else"] =                    ELSE;
 366     (*KeywordMap)["discard"] =                 DISCARD;
 367     (*KeywordMap)["return"] =                  RETURN;
 368     (*KeywordMap)["void"] =                    VOID;
 369     (*KeywordMap)["bool"] =                    BOOL;
 370     (*KeywordMap)["float"] =                   FLOAT;
 371     (*KeywordMap)["int"] =                     INT;
 372     (*KeywordMap)["bvec2"] =                   BVEC2;
 373     (*KeywordMap)["bvec3"] =                   BVEC3;
 374     (*KeywordMap)["bvec4"] =                   BVEC4;
 375     (*KeywordMap)["vec2"] =                    VEC2;
 376     (*KeywordMap)["vec3"] =                    VEC3;
 377     (*KeywordMap)["vec4"] =                    VEC4;
 378     (*KeywordMap)["ivec2"] =                   IVEC2;
 379     (*KeywordMap)["ivec3"] =                   IVEC3;
 380     (*KeywordMap)["ivec4"] =                   IVEC4;
 381     (*KeywordMap)["mat2"] =                    MAT2;
 382     (*KeywordMap)["mat3"] =                    MAT3;
 383     (*KeywordMap)["mat4"] =                    MAT4;
 384     (*KeywordMap)["true"] =                    BOOLCONSTANT;
 385     (*KeywordMap)["false"] =                   BOOLCONSTANT;
 386     (*KeywordMap)["layout"] =                  LAYOUT;
 387     (*KeywordMap)["shared"] =                  SHARED;
 388     (*KeywordMap)["highp"] =                   HIGH_PRECISION;
 389     (*KeywordMap)["mediump"] =                 MEDIUM_PRECISION;
 390     (*KeywordMap)["lowp"] =                    LOW_PRECISION;
 391     (*KeywordMap)["superp"] =                  SUPERP;
 392     (*KeywordMap)["precision"] =               PRECISION;
 393     (*KeywordMap)["mat2x2"] =                  MAT2X2;
 394     (*KeywordMap)["mat2x3"] =                  MAT2X3;
 395     (*KeywordMap)["mat2x4"] =                  MAT2X4;
 396     (*KeywordMap)["mat3x2"] =                  MAT3X2;
 397     (*KeywordMap)["mat3x3"] =                  MAT3X3;
 398     (*KeywordMap)["mat3x4"] =                  MAT3X4;
 399     (*KeywordMap)["mat4x2"] =                  MAT4X2;
 400     (*KeywordMap)["mat4x3"] =                  MAT4X3;
 401     (*KeywordMap)["mat4x4"] =                  MAT4X4;
 402     (*KeywordMap)["uint"] =                    UINT;
 403     (*KeywordMap)["uvec2"] =                   UVEC2;
 404     (*KeywordMap)["uvec3"] =                   UVEC3;
 405     (*KeywordMap)["uvec4"] =                   UVEC4;
 406
 407 #ifndef GLSLANG_WEB
 408     (*KeywordMap)["nonuniformEXT"] =           NONUNIFORM;
 409     (*KeywordMap)["demote"] =                  DEMOTE;
 410     (*KeywordMap)["attribute"] =               ATTRIBUTE;
 411     (*KeywordMap)["varying"] =                 VARYING;
 412     (*KeywordMap)["noperspective"] =           NOPERSPECTIVE;
 413     (*KeywordMap)["coherent"] =                COHERENT;
 414     (*KeywordMap)["devicecoherent"] =          DEVICECOHERENT;
 415     (*KeywordMap)["queuefamilycoherent"] =     QUEUEFAMILYCOHERENT;
 416     (*KeywordMap)["workgroupcoherent"] =       WORKGROUPCOHERENT;
 417     (*KeywordMap)["subgroupcoherent"] =        SUBGROUPCOHERENT;
 418     (*KeywordMap)["shadercallcoherent"] =      SHADERCALLCOHERENT;
 419     (*KeywordMap)["nonprivate"] =              NONPRIVATE;
 420     (*KeywordMap)["restrict"] =                RESTRICT;
 421     (*KeywordMap)["readonly"] =                READONLY;
 422     (*KeywordMap)["writeonly"] =               WRITEONLY;
 423     (*KeywordMap)["atomic_uint"] =             ATOMIC_UINT;
 424     (*KeywordMap)["volatile"] =                VOLATILE;
 425     (*KeywordMap)["patch"] =                   PATCH;
 426     (*KeywordMap)["sample"] =                  SAMPLE;
 427     (*KeywordMap)["subroutine"] =              SUBROUTINE;
 428     (*KeywordMap)["dmat2"] =                   DMAT2;
 429     (*KeywordMap)["dmat3"] =                   DMAT3;
 430     (*KeywordMap)["dmat4"] =                   DMAT4;
 431     (*KeywordMap)["dmat2x2"] =                 DMAT2X2;
 432     (*KeywordMap)["dmat2x3"] =                 DMAT2X3;
 433     (*KeywordMap)["dmat2x4"] =                 DMAT2X4;
 434     (*KeywordMap)["dmat3x2"] =                 DMAT3X2;
 435     (*KeywordMap)["dmat3x3"] =                 DMAT3X3;
 436     (*KeywordMap)["dmat3x4"] =                 DMAT3X4;
 437     (*KeywordMap)["dmat4x2"] =                 DMAT4X2;
 438     (*KeywordMap)["dmat4x3"] =                 DMAT4X3;
 439     (*KeywordMap)["dmat4x4"] =                 DMAT4X4;
 440     (*KeywordMap)["image1D"] =                 IMAGE1D;
 441     (*KeywordMap)["iimage1D"] =                IIMAGE1D;
 442     (*KeywordMap)["uimage1D"] =                UIMAGE1D;
 443     (*KeywordMap)["image2D"] =                 IMAGE2D;
 444     (*KeywordMap)["iimage2D"] =                IIMAGE2D;
 445     (*KeywordMap)["uimage2D"] =                UIMAGE2D;
 446     (*KeywordMap)["image3D"] =                 IMAGE3D;
 447     (*KeywordMap)["iimage3D"] =                IIMAGE3D;
 448     (*KeywordMap)["uimage3D"] =                UIMAGE3D;
 449     (*KeywordMap)["image2DRect"] =             IMAGE2DRECT;
 450     (*KeywordMap)["iimage2DRect"] =            IIMAGE2DRECT;
 451     (*KeywordMap)["uimage2DRect"] =            UIMAGE2DRECT;
 452     (*KeywordMap)["imageCube"] =               IMAGECUBE;
 453     (*KeywordMap)["iimageCube"] =              IIMAGECUBE;
 454     (*KeywordMap)["uimageCube"] =              UIMAGECUBE;
 455     (*KeywordMap)["imageBuffer"] =             IMAGEBUFFER;
 456     (*KeywordMap)["iimageBuffer"] =            IIMAGEBUFFER;
 457     (*KeywordMap)["uimageBuffer"] =            UIMAGEBUFFER;
 458     (*KeywordMap)["image1DArray"] =            IMAGE1DARRAY;
 459     (*KeywordMap)["iimage1DArray"] =           IIMAGE1DARRAY;
 460     (*KeywordMap)["uimage1DArray"] =           UIMAGE1DARRAY;
 461     (*KeywordMap)["image2DArray"] =            IMAGE2DARRAY;
 462     (*KeywordMap)["iimage2DArray"] =           IIMAGE2DARRAY;
 463     (*KeywordMap)["uimage2DArray"] =           UIMAGE2DARRAY;
 464     (*KeywordMap)["imageCubeArray"] =          IMAGECUBEARRAY;
 465     (*KeywordMap)["iimageCubeArray"] =         IIMAGECUBEARRAY;
 466     (*KeywordMap)["uimageCubeArray"] =         UIMAGECUBEARRAY;
 467     (*KeywordMap)["image2DMS"] =               IMAGE2DMS;
 468     (*KeywordMap)["iimage2DMS"] =              IIMAGE2DMS;
 469     (*KeywordMap)["uimage2DMS"] =              UIMAGE2DMS;
 470     (*KeywordMap)["image2DMSArray"] =          IMAGE2DMSARRAY;
 471     (*KeywordMap)["iimage2DMSArray"] =         IIMAGE2DMSARRAY;
 472     (*KeywordMap)["uimage2DMSArray"] =         UIMAGE2DMSARRAY;
 473     (*KeywordMap)["double"] =                  DOUBLE;
 474     (*KeywordMap)["dvec2"] =                   DVEC2;
 475     (*KeywordMap)["dvec3"] =                   DVEC3;
 476     (*KeywordMap)["dvec4"] =                   DVEC4;
 477     (*KeywordMap)["int64_t"] =                 INT64_T;
 478     (*KeywordMap)["uint64_t"] =                UINT64_T;
 479     (*KeywordMap)["i64vec2"] =                 I64VEC2;
 480     (*KeywordMap)["i64vec3"] =                 I64VEC3;
 481     (*KeywordMap)["i64vec4"] =                 I64VEC4;
 482     (*KeywordMap)["u64vec2"] =                 U64VEC2;
 483     (*KeywordMap)["u64vec3"] =                 U64VEC3;
 484     (*KeywordMap)["u64vec4"] =                 U64VEC4;
 485
 486     // GL_EXT_shader_explicit_arithmetic_types
 487     (*KeywordMap)["int8_t"] =                  INT8_T;
 488     (*KeywordMap)["i8vec2"] =                  I8VEC2;
 489     (*KeywordMap)["i8vec3"] =                  I8VEC3;
 490     (*KeywordMap)["i8vec4"] =                  I8VEC4;
 491     (*KeywordMap)["uint8_t"] =                 UINT8_T;
 492     (*KeywordMap)["u8vec2"] =                  U8VEC2;
 493     (*KeywordMap)["u8vec3"] =                  U8VEC3;
 494     (*KeywordMap)["u8vec4"] =                  U8VEC4;
 495
 496     (*KeywordMap)["int16_t"] =                 INT16_T;
 497     (*KeywordMap)["i16vec2"] =                 I16VEC2;
 498     (*KeywordMap)["i16vec3"] =                 I16VEC3;
 499     (*KeywordMap)["i16vec4"] =                 I16VEC4;
 500     (*KeywordMap)["uint16_t"] =                UINT16_T;
 501     (*KeywordMap)["u16vec2"] =                 U16VEC2;
 502     (*KeywordMap)["u16vec3"] =                 U16VEC3;
 503     (*KeywordMap)["u16vec4"] =                 U16VEC4;
 504
 505     (*KeywordMap)["int32_t"] =                 INT32_T;
 506     (*KeywordMap)["i32vec2"] =                 I32VEC2;
 507     (*KeywordMap)["i32vec3"] =                 I32VEC3;
 508     (*KeywordMap)["i32vec4"] =                 I32VEC4;
 509     (*KeywordMap)["uint32_t"] =                UINT32_T;
 510     (*KeywordMap)["u32vec2"] =                 U32VEC2;
 511     (*KeywordMap)["u32vec3"] =                 U32VEC3;
 512     (*KeywordMap)["u32vec4"] =                 U32VEC4;
 513
 514     (*KeywordMap)["float16_t"] =               FLOAT16_T;
 515     (*KeywordMap)["f16vec2"] =                 F16VEC2;
 516     (*KeywordMap)["f16vec3"] =                 F16VEC3;
 517     (*KeywordMap)["f16vec4"] =                 F16VEC4;
 518     (*KeywordMap)["f16mat2"] =                 F16MAT2;
 519     (*KeywordMap)["f16mat3"] =                 F16MAT3;
 520     (*KeywordMap)["f16mat4"] =                 F16MAT4;
 521     (*KeywordMap)["f16mat2x2"] =               F16MAT2X2;
 522     (*KeywordMap)["f16mat2x3"] =               F16MAT2X3;
 523     (*KeywordMap)["f16mat2x4"] =               F16MAT2X4;
 524     (*KeywordMap)["f16mat3x2"] =               F16MAT3X2;
 525     (*KeywordMap)["f16mat3x3"] =               F16MAT3X3;
 526     (*KeywordMap)["f16mat3x4"] =               F16MAT3X4;
 527     (*KeywordMap)["f16mat4x2"] =               F16MAT4X2;
 528     (*KeywordMap)["f16mat4x3"] =               F16MAT4X3;
 529     (*KeywordMap)["f16mat4x4"] =               F16MAT4X4;
 530
 531     (*KeywordMap)["float32_t"] =               FLOAT32_T;
 532     (*KeywordMap)["f32vec2"] =                 F32VEC2;
 533     (*KeywordMap)["f32vec3"] =                 F32VEC3;
 534     (*KeywordMap)["f32vec4"] =                 F32VEC4;
 535     (*KeywordMap)["f32mat2"] =                 F32MAT2;
 536     (*KeywordMap)["f32mat3"] =                 F32MAT3;
 537     (*KeywordMap)["f32mat4"] =                 F32MAT4;
 538     (*KeywordMap)["f32mat2x2"] =               F32MAT2X2;
 539     (*KeywordMap)["f32mat2x3"] =               F32MAT2X3;
 540     (*KeywordMap)["f32mat2x4"] =               F32MAT2X4;
 541     (*KeywordMap)["f32mat3x2"] =               F32MAT3X2;
 542     (*KeywordMap)["f32mat3x3"] =               F32MAT3X3;
 543     (*KeywordMap)["f32mat3x4"] =               F32MAT3X4;
 544     (*KeywordMap)["f32mat4x2"] =               F32MAT4X2;
 545     (*KeywordMap)["f32mat4x3"] =               F32MAT4X3;
 546     (*KeywordMap)["f32mat4x4"] =               F32MAT4X4;
 547     (*KeywordMap)["float64_t"] =               FLOAT64_T;
 548     (*KeywordMap)["f64vec2"] =                 F64VEC2;
 549     (*KeywordMap)["f64vec3"] =                 F64VEC3;
 550     (*KeywordMap)["f64vec4"] =                 F64VEC4;
 551     (*KeywordMap)["f64mat2"] =                 F64MAT2;
 552     (*KeywordMap)["f64mat3"] =                 F64MAT3;
 553     (*KeywordMap)["f64mat4"] =                 F64MAT4;
 554     (*KeywordMap)["f64mat2x2"] =               F64MAT2X2;
 555     (*KeywordMap)["f64mat2x3"] =               F64MAT2X3;
 556     (*KeywordMap)["f64mat2x4"] =               F64MAT2X4;
 557     (*KeywordMap)["f64mat3x2"] =               F64MAT3X2;
 558     (*KeywordMap)["f64mat3x3"] =               F64MAT3X3;
 559     (*KeywordMap)["f64mat3x4"] =               F64MAT3X4;
 560     (*KeywordMap)["f64mat4x2"] =               F64MAT4X2;
 561     (*KeywordMap)["f64mat4x3"] =               F64MAT4X3;
 562     (*KeywordMap)["f64mat4x4"] =               F64MAT4X4;
 563 #endif
 564
 565     (*KeywordMap)["sampler2D"] =               SAMPLER2D;
 566     (*KeywordMap)["samplerCube"] =             SAMPLERCUBE;
 567     (*KeywordMap)["samplerCubeShadow"] =       SAMPLERCUBESHADOW;
 568     (*KeywordMap)["sampler2DArray"] =          SAMPLER2DARRAY;
 569     (*KeywordMap)["sampler2DArrayShadow"] =    SAMPLER2DARRAYSHADOW;
 570     (*KeywordMap)["isampler2D"] =              ISAMPLER2D;
 571     (*KeywordMap)["isampler3D"] =              ISAMPLER3D;
 572     (*KeywordMap)["isamplerCube"] =            ISAMPLERCUBE;
 573     (*KeywordMap)["isampler2DArray"] =         ISAMPLER2DARRAY;
 574     (*KeywordMap)["usampler2D"] =              USAMPLER2D;
 575     (*KeywordMap)["usampler3D"] =              USAMPLER3D;
 576     (*KeywordMap)["usamplerCube"] =            USAMPLERCUBE;
 577     (*KeywordMap)["usampler2DArray"] =         USAMPLER2DARRAY;
 578     (*KeywordMap)["sampler3D"] =               SAMPLER3D;
 579     (*KeywordMap)["sampler2DShadow"] =         SAMPLER2DSHADOW;
 580
 581     (*KeywordMap)["texture2D"] =               TEXTURE2D;
 582     (*KeywordMap)["textureCube"] =             TEXTURECUBE;
 583     (*KeywordMap)["texture2DArray"] =          TEXTURE2DARRAY;
 584     (*KeywordMap)["itexture2D"] =              ITEXTURE2D;
 585     (*KeywordMap)["itexture3D"] =              ITEXTURE3D;
 586     (*KeywordMap)["itextureCube"] =            ITEXTURECUBE;
 587     (*KeywordMap)["itexture2DArray"] =         ITEXTURE2DARRAY;
 588     (*KeywordMap)["utexture2D"] =              UTEXTURE2D;
 589     (*KeywordMap)["utexture3D"] =              UTEXTURE3D;
 590     (*KeywordMap)["utextureCube"] =            UTEXTURECUBE;
 591     (*KeywordMap)["utexture2DArray"] =         UTEXTURE2DARRAY;
 592     (*KeywordMap)["texture3D"] =               TEXTURE3D;
 593
 594     (*KeywordMap)["sampler"] =                 SAMPLER;
 595     (*KeywordMap)["samplerShadow"] =           SAMPLERSHADOW;
 596
 597 #ifndef GLSLANG_WEB
 598     (*KeywordMap)["textureCubeArray"] =        TEXTURECUBEARRAY;
 599     (*KeywordMap)["itextureCubeArray"] =       ITEXTURECUBEARRAY;
 600     (*KeywordMap)["utextureCubeArray"] =       UTEXTURECUBEARRAY;
 601     (*KeywordMap)["samplerCubeArray"] =        SAMPLERCUBEARRAY;
 602     (*KeywordMap)["samplerCubeArrayShadow"] =  SAMPLERCUBEARRAYSHADOW;
 603     (*KeywordMap)["isamplerCubeArray"] =       ISAMPLERCUBEARRAY;
 604     (*KeywordMap)["usamplerCubeArray"] =       USAMPLERCUBEARRAY;
 605     (*KeywordMap)["sampler1DArrayShadow"] =    SAMPLER1DARRAYSHADOW;
 606     (*KeywordMap)["isampler1DArray"] =         ISAMPLER1DARRAY;
 607     (*KeywordMap)["usampler1D"] =              USAMPLER1D;
 608     (*KeywordMap)["isampler1D"] =              ISAMPLER1D;
 609     (*KeywordMap)["usampler1DArray"] =         USAMPLER1DARRAY;
 610     (*KeywordMap)["samplerBuffer"] =           SAMPLERBUFFER;
 611     (*KeywordMap)["isampler2DRect"] =          ISAMPLER2DRECT;
 612     (*KeywordMap)["usampler2DRect"] =          USAMPLER2DRECT;
 613     (*KeywordMap)["isamplerBuffer"] =          ISAMPLERBUFFER;
 614     (*KeywordMap)["usamplerBuffer"] =          USAMPLERBUFFER;
 615     (*KeywordMap)["sampler2DMS"] =             SAMPLER2DMS;
 616     (*KeywordMap)["isampler2DMS"] =            ISAMPLER2DMS;
 617     (*KeywordMap)["usampler2DMS"] =            USAMPLER2DMS;
 618     (*KeywordMap)["sampler2DMSArray"] =        SAMPLER2DMSARRAY;
 619     (*KeywordMap)["isampler2DMSArray"] =       ISAMPLER2DMSARRAY;
 620     (*KeywordMap)["usampler2DMSArray"] =       USAMPLER2DMSARRAY;
 621     (*KeywordMap)["sampler1D"] =               SAMPLER1D;
 622     (*KeywordMap)["sampler1DShadow"] =         SAMPLER1DSHADOW;
 623     (*KeywordMap)["sampler2DRect"] =           SAMPLER2DRECT;
 624     (*KeywordMap)["sampler2DRectShadow"] =     SAMPLER2DRECTSHADOW;
 625     (*KeywordMap)["sampler1DArray"] =          SAMPLER1DARRAY;
 626
 627     (*KeywordMap)["samplerExternalOES"] =      SAMPLEREXTERNALOES; // GL_OES_EGL_image_external
 628
 629     (*KeywordMap)["__samplerExternal2DY2YEXT"] = SAMPLEREXTERNAL2DY2YEXT; // GL_EXT_YUV_target
 630
 631     (*KeywordMap)["itexture1DArray"] =         ITEXTURE1DARRAY;
 632     (*KeywordMap)["utexture1D"] =              UTEXTURE1D;
 633     (*KeywordMap)["itexture1D"] =              ITEXTURE1D;
 634     (*KeywordMap)["utexture1DArray"] =         UTEXTURE1DARRAY;
 635     (*KeywordMap)["textureBuffer"] =           TEXTUREBUFFER;
 636     (*KeywordMap)["itexture2DRect"] =          ITEXTURE2DRECT;
 637     (*KeywordMap)["utexture2DRect"] =          UTEXTURE2DRECT;
 638     (*KeywordMap)["itextureBuffer"] =          ITEXTUREBUFFER;
 639     (*KeywordMap)["utextureBuffer"] =          UTEXTUREBUFFER;
 640     (*KeywordMap)["texture2DMS"] =             TEXTURE2DMS;
 641     (*KeywordMap)["itexture2DMS"] =            ITEXTURE2DMS;
 642     (*KeywordMap)["utexture2DMS"] =            UTEXTURE2DMS;
 643     (*KeywordMap)["texture2DMSArray"] =        TEXTURE2DMSARRAY;
 644     (*KeywordMap)["itexture2DMSArray"] =       ITEXTURE2DMSARRAY;
 645     (*KeywordMap)["utexture2DMSArray"] =       UTEXTURE2DMSARRAY;
 646     (*KeywordMap)["texture1D"] =               TEXTURE1D;
 647     (*KeywordMap)["texture2DRect"] =           TEXTURE2DRECT;
 648     (*KeywordMap)["texture1DArray"] =          TEXTURE1DARRAY;
 649
 650     (*KeywordMap)["subpassInput"] =            SUBPASSINPUT;
 651     (*KeywordMap)["subpassInputMS"] =          SUBPASSINPUTMS;
 652     (*KeywordMap)["isubpassInput"] =           ISUBPASSINPUT;
 653     (*KeywordMap)["isubpassInputMS"] =         ISUBPASSINPUTMS;
 654     (*KeywordMap)["usubpassInput"] =           USUBPASSINPUT;
 655     (*KeywordMap)["usubpassInputMS"] =         USUBPASSINPUTMS;
 656
 657     (*KeywordMap)["f16sampler1D"] =                 F16SAMPLER1D;
 658     (*KeywordMap)["f16sampler2D"] =                 F16SAMPLER2D;
 659     (*KeywordMap)["f16sampler3D"] =                 F16SAMPLER3D;
 660     (*KeywordMap)["f16sampler2DRect"] =             F16SAMPLER2DRECT;
 661     (*KeywordMap)["f16samplerCube"] =               F16SAMPLERCUBE;
 662     (*KeywordMap)["f16sampler1DArray"] =            F16SAMPLER1DARRAY;
 663     (*KeywordMap)["f16sampler2DArray"] =            F16SAMPLER2DARRAY;
 664     (*KeywordMap)["f16samplerCubeArray"] =          F16SAMPLERCUBEARRAY;
 665     (*KeywordMap)["f16samplerBuffer"] =             F16SAMPLERBUFFER;
 666     (*KeywordMap)["f16sampler2DMS"] =               F16SAMPLER2DMS;
 667     (*KeywordMap)["f16sampler2DMSArray"] =          F16SAMPLER2DMSARRAY;
 668     (*KeywordMap)["f16sampler1DShadow"] =           F16SAMPLER1DSHADOW;
 669     (*KeywordMap)["f16sampler2DShadow"] =           F16SAMPLER2DSHADOW;
 670     (*KeywordMap)["f16sampler2DRectShadow"] =       F16SAMPLER2DRECTSHADOW;
 671     (*KeywordMap)["f16samplerCubeShadow"] =         F16SAMPLERCUBESHADOW;
 672     (*KeywordMap)["f16sampler1DArrayShadow"] =      F16SAMPLER1DARRAYSHADOW;
 673     (*KeywordMap)["f16sampler2DArrayShadow"] =      F16SAMPLER2DARRAYSHADOW;
 674     (*KeywordMap)["f16samplerCubeArrayShadow"] =    F16SAMPLERCUBEARRAYSHADOW;
 675
 676     (*KeywordMap)["f16image1D"] =                   F16IMAGE1D;
 677     (*KeywordMap)["f16image2D"] =                   F16IMAGE2D;
 678     (*KeywordMap)["f16image3D"] =                   F16IMAGE3D;
 679     (*KeywordMap)["f16image2DRect"] =               F16IMAGE2DRECT;
 680     (*KeywordMap)["f16imageCube"] =                 F16IMAGECUBE;
 681     (*KeywordMap)["f16image1DArray"] =              F16IMAGE1DARRAY;
 682     (*KeywordMap)["f16image2DArray"] =              F16IMAGE2DARRAY;
 683     (*KeywordMap)["f16imageCubeArray"] =            F16IMAGECUBEARRAY;
 684     (*KeywordMap)["f16imageBuffer"] =               F16IMAGEBUFFER;
 685     (*KeywordMap)["f16image2DMS"] =                 F16IMAGE2DMS;
 686     (*KeywordMap)["f16image2DMSArray"] =            F16IMAGE2DMSARRAY;
 687
 688     (*KeywordMap)["f16texture1D"] =                 F16TEXTURE1D;
 689     (*KeywordMap)["f16texture2D"] =                 F16TEXTURE2D;
 690     (*KeywordMap)["f16texture3D"] =                 F16TEXTURE3D;
 691     (*KeywordMap)["f16texture2DRect"] =             F16TEXTURE2DRECT;
 692     (*KeywordMap)["f16textureCube"] =               F16TEXTURECUBE;
 693     (*KeywordMap)["f16texture1DArray"] =            F16TEXTURE1DARRAY;
 694     (*KeywordMap)["f16texture2DArray"] =            F16TEXTURE2DARRAY;
 695     (*KeywordMap)["f16textureCubeArray"] =          F16TEXTURECUBEARRAY;
 696     (*KeywordMap)["f16textureBuffer"] =             F16TEXTUREBUFFER;
 697     (*KeywordMap)["f16texture2DMS"] =               F16TEXTURE2DMS;
 698     (*KeywordMap)["f16texture2DMSArray"] =          F16TEXTURE2DMSARRAY;
 699
 700     (*KeywordMap)["f16subpassInput"] =              F16SUBPASSINPUT;
 701     (*KeywordMap)["f16subpassInputMS"] =            F16SUBPASSINPUTMS;
 702     (*KeywordMap)["__explicitInterpAMD"] =     EXPLICITINTERPAMD;
 703     (*KeywordMap)["pervertexNV"] =             PERVERTEXNV;
 704     (*KeywordMap)["precise"] =                 PRECISE;
 705
 706     (*KeywordMap)["rayPayloadNV"] =            PAYLOADNV;
 707     (*KeywordMap)["rayPayloadEXT"] =           PAYLOADEXT;
 708     (*KeywordMap)["rayPayloadInNV"] =          PAYLOADINNV;
 709     (*KeywordMap)["rayPayloadInEXT"] =         PAYLOADINEXT;
 710     (*KeywordMap)["hitAttributeNV"] =          HITATTRNV;
 711     (*KeywordMap)["hitAttributeEXT"] =         HITATTREXT;
 712     (*KeywordMap)["callableDataNV"] =          CALLDATANV;
 713     (*KeywordMap)["callableDataEXT"] =         CALLDATAEXT;
 714     (*KeywordMap)["callableDataInNV"] =        CALLDATAINNV;
 715     (*KeywordMap)["callableDataInEXT"] =       CALLDATAINEXT;
 716     (*KeywordMap)["accelerationStructureNV"] = ACCSTRUCTNV;
 717     (*KeywordMap)["accelerationStructureEXT"]   = ACCSTRUCTEXT;
 718     (*KeywordMap)["perprimitiveNV"] =          PERPRIMITIVENV;
 719     (*KeywordMap)["perviewNV"] =               PERVIEWNV;
 720     (*KeywordMap)["taskNV"] =                  PERTASKNV;
 721
 722     (*KeywordMap)["fcoopmatNV"] =              FCOOPMATNV;
 723     (*KeywordMap)["icoopmatNV"] =              ICOOPMATNV;
 724     (*KeywordMap)["ucoopmatNV"] =              UCOOPMATNV;
 725
 726     ReservedSet = new std::unordered_set<const char*, str_hash, str_eq>;
 727
 728     ReservedSet->insert("common");
 729     ReservedSet->insert("partition");
 730     ReservedSet->insert("active");
 731     ReservedSet->insert("asm");
 732     ReservedSet->insert("class");
 733     ReservedSet->insert("union");
 734     ReservedSet->insert("enum");
 735     ReservedSet->insert("typedef");
 736     ReservedSet->insert("template");
 737     ReservedSet->insert("this");
 738     ReservedSet->insert("goto");
 739     ReservedSet->insert("inline");
 740     ReservedSet->insert("noinline");
 741     ReservedSet->insert("public");
 742     ReservedSet->insert("static");
 743     ReservedSet->insert("extern");
 744     ReservedSet->insert("external");
 745     ReservedSet->insert("interface");
 746     ReservedSet->insert("long");
 747     ReservedSet->insert("short");
 748     ReservedSet->insert("half");
 749     ReservedSet->insert("fixed");
 750     ReservedSet->insert("unsigned");
 751     ReservedSet->insert("input");
 752     ReservedSet->insert("output");
 753     ReservedSet->insert("hvec2");
 754     ReservedSet->insert("hvec3");
 755     ReservedSet->insert("hvec4");
 756     ReservedSet->insert("fvec2");
 757     ReservedSet->insert("fvec3");
 758     ReservedSet->insert("fvec4");
 759     ReservedSet->insert("sampler3DRect");
 760     ReservedSet->insert("filter");
 761     ReservedSet->insert("sizeof");
 762     ReservedSet->insert("cast");
 763     ReservedSet->insert("namespace");
 764     ReservedSet->insert("using");
 765 #endif
 766 }
 767
 768 void TScanContext::deleteKeywordMap()
 769 {
 770     delete KeywordMap;
 771     KeywordMap = nullptr;
 772 #ifndef GLSLANG_WEB
 773     delete ReservedSet;
 774     ReservedSet = nullptr;
 775 #endif
 776 }
 777
 778 // Called by yylex to get the next token.
 779 // Returning 0 implies end of input.
 780 int TScanContext::tokenize(TPpContext* pp, TParserToken& token)
 781 {
 782     do {
 783         parserToken = &token;
 784         TPpToken ppToken;
 785         int token = pp->tokenize(ppToken);
 786         if (token == EndOfInput)
 787             return 0;
 788
 789         tokenText = ppToken.name;
 790         loc = ppToken.loc;
 791         parserToken->sType.lex.loc = loc;
 792         switch (token) {
 793         case ';':  afterType = false; afterBuffer = false; return SEMICOLON;
 794         case ',':  afterType = false;   return COMMA;
 795         case ':':                       return COLON;
 796         case '=':  afterType = false;   return EQUAL;
 797         case '(':  afterType = false;   return LEFT_PAREN;
 798         case ')':  afterType = false;   return RIGHT_PAREN;
 799         case '.':  field = true;        return DOT;
 800         case '!':                       return BANG;
 801         case '-':                       return DASH;
 802         case '~':                       return TILDE;
 803         case '+':                       return PLUS;
 804         case '*':                       return STAR;
 805         case '/':                       return SLASH;
 806         case '%':                       return PERCENT;
 807         case '<':                       return LEFT_ANGLE;
 808         case '>':                       return RIGHT_ANGLE;
 809         case '|':                       return VERTICAL_BAR;
 810         case '^':                       return CARET;
 811         case '&':                       return AMPERSAND;
 812         case '?':                       return QUESTION;
 813         case '[':                       return LEFT_BRACKET;
 814         case ']':                       return RIGHT_BRACKET;
 815         case '{':  afterStruct = false; afterBuffer = false; return LEFT_BRACE;
 816         case '}':                       return RIGHT_BRACE;
 817         case '\\':
 818             parseContext.error(loc, "illegal use of escape character", "\\", "");
 819             break;
 820
 821         case PPAtomAddAssign:          return ADD_ASSIGN;
 822         case PPAtomSubAssign:          return SUB_ASSIGN;
 823         case PPAtomMulAssign:          return MUL_ASSIGN;
 824         case PPAtomDivAssign:          return DIV_ASSIGN;
 825         case PPAtomModAssign:          return MOD_ASSIGN;
 826
 827         case PpAtomRight:              return RIGHT_OP;
 828         case PpAtomLeft:               return LEFT_OP;
 829
 830         case PpAtomRightAssign:        return RIGHT_ASSIGN;
 831         case PpAtomLeftAssign:         return LEFT_ASSIGN;
 832         case PpAtomAndAssign:          return AND_ASSIGN;
 833         case PpAtomOrAssign:           return OR_ASSIGN;
 834         case PpAtomXorAssign:          return XOR_ASSIGN;
 835
 836         case PpAtomAnd:                return AND_OP;
 837         case PpAtomOr:                 return OR_OP;
 838         case PpAtomXor:                return XOR_OP;
 839
 840         case PpAtomEQ:                 return EQ_OP;
 841         case PpAtomGE:                 return GE_OP;
 842         case PpAtomNE:                 return NE_OP;
 843         case PpAtomLE:                 return LE_OP;
 844
 845         case PpAtomDecrement:          return DEC_OP;
 846         case PpAtomIncrement:          return INC_OP;
 847
 848         case PpAtomColonColon:
 849             parseContext.error(loc, "not supported", "::", "");
 850             break;
 851
 852         case PpAtomConstString:        parserToken->sType.lex.string = NewPoolTString(tokenText);     return STRING_LITERAL;
 853         case PpAtomConstInt:           parserToken->sType.lex.i    = ppToken.ival;       return INTCONSTANT;
 854         case PpAtomConstUint:          parserToken->sType.lex.i    = ppToken.ival;       return UINTCONSTANT;
 855         case PpAtomConstFloat:         parserToken->sType.lex.d    = ppToken.dval;       return FLOATCONSTANT;
 856 #ifndef GLSLANG_WEB
 857         case PpAtomConstInt16:         parserToken->sType.lex.i    = ppToken.ival;       return INT16CONSTANT;
 858         case PpAtomConstUint16:        parserToken->sType.lex.i    = ppToken.ival;       return UINT16CONSTANT;
 859         case PpAtomConstInt64:         parserToken->sType.lex.i64  = ppToken.i64val;     return INT64CONSTANT;
 860         case PpAtomConstUint64:        parserToken->sType.lex.i64  = ppToken.i64val;     return UINT64CONSTANT;
 861         case PpAtomConstDouble:        parserToken->sType.lex.d    = ppToken.dval;       return DOUBLECONSTANT;
 862         case PpAtomConstFloat16:       parserToken->sType.lex.d    = ppToken.dval;       return FLOAT16CONSTANT;
 863 #endif
 864         case PpAtomIdentifier:
 865         {
 866             int token = tokenizeIdentifier();
 867             field = false;
 868             return token;
 869         }
 870
 871         case EndOfInput:               return 0;
 872
 873         default:
 874             char buf[2];
 875             buf[0] = (char)token;
 876             buf[1] = 0;
 877             parseContext.error(loc, "unexpected token", buf, "");
 878             break;
 879         }
 880     } while (true);
 881 }
 882
 883 int TScanContext::tokenizeIdentifier()
 884 {
 885 #ifndef GLSLANG_WEB
 886     if (ReservedSet->find(tokenText) != ReservedSet->end())
 887         return reservedWord();
 888 #endif
 889
 890     auto it = KeywordMap->find(tokenText);
 891     if (it == KeywordMap->end()) {
 892         // Should have an identifier of some sort
 893         return identifierOrType();
 894     }
 895     keyword = it->second;
 896
 897     switch (keyword) {
 898     case CONST:
 899     case UNIFORM:
 900     case IN:
 901     case OUT:
 902     case INOUT:
 903     case BREAK:
 904     case CONTINUE:
 905     case DO:
 906     case FOR:
 907     case WHILE:
 908     case IF:
 909     case ELSE:
 910     case DISCARD:
 911     case RETURN:
 912     case CASE:
 913         return keyword;
 914
 915     case BUFFER:
 916         afterBuffer = true;
 917         if ((parseContext.isEsProfile() && parseContext.version < 310) ||
 918             (!parseContext.isEsProfile() && parseContext.version < 430))
 919             return identifierOrType();
 920         return keyword;
 921
 922     case STRUCT:
 923         afterStruct = true;
 924         return keyword;
 925
 926     case SWITCH:
 927     case DEFAULT:
 928         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
 929             (!parseContext.isEsProfile() && parseContext.version < 130))
 930             reservedWord();
 931         return keyword;
 932
 933     case VOID:
 934     case BOOL:
 935     case FLOAT:
 936     case INT:
 937     case BVEC2:
 938     case BVEC3:
 939     case BVEC4:
 940     case VEC2:
 941     case VEC3:
 942     case VEC4:
 943     case IVEC2:
 944     case IVEC3:
 945     case IVEC4:
 946     case MAT2:
 947     case MAT3:
 948     case MAT4:
 949     case SAMPLER2D:
 950     case SAMPLERCUBE:
 951         afterType = true;
 952         return keyword;
 953
 954     case BOOLCONSTANT:
 955         if (strcmp("true", tokenText) == 0)
 956             parserToken->sType.lex.b = true;
 957         else
 958             parserToken->sType.lex.b = false;
 959         return keyword;
 960
 961     case SMOOTH:
 962         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
 963             (!parseContext.isEsProfile() && parseContext.version < 130))
 964             return identifierOrType();
 965         return keyword;
 966     case FLAT:
 967         if (parseContext.isEsProfile() && parseContext.version < 300)
 968             reservedWord();
 969         else if (!parseContext.isEsProfile() && parseContext.version < 130)
 970             return identifierOrType();
 971         return keyword;
 972     case CENTROID:
 973         if (parseContext.version < 120)
 974             return identifierOrType();
 975         return keyword;
 976     case INVARIANT:
 977         if (!parseContext.isEsProfile() && parseContext.version < 120)
 978             return identifierOrType();
 979         return keyword;
 980     case PACKED:
 981         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
 982             (!parseContext.isEsProfile() && parseContext.version < 330))
 983             return reservedWord();
 984         return identifierOrType();
 985
 986     case RESOURCE:
 987     {
 988         bool reserved = (parseContext.isEsProfile() && parseContext.version >= 300) ||
 989                         (!parseContext.isEsProfile() && parseContext.version >= 420);
 990         return identifierOrReserved(reserved);
 991     }
 992     case SUPERP:
 993     {
 994         bool reserved = parseContext.isEsProfile() || parseContext.version >= 130;
 995         return identifierOrReserved(reserved);
 996     }
 997
 998 #ifndef GLSLANG_WEB
 999     case NOPERSPECTIVE:
1000         if (parseContext.extensionTurnedOn(E_GL_NV_shader_noperspective_interpolation))
1001             return keyword;
1002         return es30ReservedFromGLSL(130);
1003
1004     case NONUNIFORM:
1005         if (parseContext.extensionTurnedOn(E_GL_EXT_nonuniform_qualifier))
1006             return keyword;
1007         else
1008             return identifierOrType();
1009     case ATTRIBUTE:
1010     case VARYING:
1011         if (parseContext.isEsProfile() && parseContext.version >= 300)
1012             reservedWord();
1013         return keyword;
1014     case PAYLOADNV:
1015     case PAYLOADINNV:
1016     case HITATTRNV:
1017     case CALLDATANV:
1018     case CALLDATAINNV:
1019     case ACCSTRUCTNV:
1020         if (parseContext.symbolTable.atBuiltInLevel() ||
1021             parseContext.extensionTurnedOn(E_GL_NV_ray_tracing))
1022             return keyword;
1023         return identifierOrType();
1024     case PAYLOADEXT:
1025     case PAYLOADINEXT:
1026     case HITATTREXT:
1027     case CALLDATAEXT:
1028     case CALLDATAINEXT:
1029     case ACCSTRUCTEXT:
1030         if (parseContext.symbolTable.atBuiltInLevel() ||
1031             parseContext.extensionTurnedOn(E_GL_EXT_ray_tracing))
1032             return keyword;
1033         return identifierOrType();
1034     case ATOMIC_UINT:
1035         if ((parseContext.isEsProfile() && parseContext.version >= 310) ||
1036             parseContext.extensionTurnedOn(E_GL_ARB_shader_atomic_counters))
1037             return keyword;
1038         return es30ReservedFromGLSL(420);
1039
1040     case COHERENT:
1041     case DEVICECOHERENT:
1042     case QUEUEFAMILYCOHERENT:
1043     case WORKGROUPCOHERENT:
1044     case SUBGROUPCOHERENT:
1045     case SHADERCALLCOHERENT:
1046     case NONPRIVATE:
1047     case RESTRICT:
1048     case READONLY:
1049     case WRITEONLY:
1050         if (parseContext.isEsProfile() && parseContext.version >= 310)
1051             return keyword;
1052         return es30ReservedFromGLSL(parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store) ? 130 : 420);
1053     case VOLATILE:
1054         if (parseContext.isEsProfile() && parseContext.version >= 310)
1055             return keyword;
1056         if (! parseContext.symbolTable.atBuiltInLevel() && (parseContext.isEsProfile() ||
1057             (parseContext.version < 420 && ! parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store))))
1058             reservedWord();
1059         return keyword;
1060     case PATCH:
1061         if (parseContext.symbolTable.atBuiltInLevel() ||
1062             (parseContext.isEsProfile() &&
1063              (parseContext.version >= 320 ||
1064               parseContext.extensionsTurnedOn(Num_AEP_tessellation_shader, AEP_tessellation_shader))) ||
1065             (!parseContext.isEsProfile() && parseContext.extensionTurnedOn(E_GL_ARB_tessellation_shader)))
1066             return keyword;
1067
1068         return es30ReservedFromGLSL(400);
1069
1070     case SAMPLE:
1071         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1072             parseContext.extensionsTurnedOn(1, &E_GL_OES_shader_multisample_interpolation))
1073             return keyword;
1074         return es30ReservedFromGLSL(400);
1075
1076     case SUBROUTINE:
1077         return es30ReservedFromGLSL(400);
1078 #endif
1079     case SHARED:
1080         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1081             (!parseContext.isEsProfile() && parseContext.version < 140))
1082             return identifierOrType();
1083         return keyword;
1084     case LAYOUT:
1085     {
1086         const int numLayoutExts = 2;
1087         const char* layoutExts[numLayoutExts] = { E_GL_ARB_shading_language_420pack,
1088                                                   E_GL_ARB_explicit_attrib_location };
1089         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1090             (!parseContext.isEsProfile() && parseContext.version < 140 &&
1091             ! parseContext.extensionsTurnedOn(numLayoutExts, layoutExts)))
1092             return identifierOrType();
1093         return keyword;
1094     }
1095
1096     case HIGH_PRECISION:
1097     case MEDIUM_PRECISION:
1098     case LOW_PRECISION:
1099     case PRECISION:
1100         return precisionKeyword();
1101
1102     case MAT2X2:
1103     case MAT2X3:
1104     case MAT2X4:
1105     case MAT3X2:
1106     case MAT3X3:
1107     case MAT3X4:
1108     case MAT4X2:
1109     case MAT4X3:
1110     case MAT4X4:
1111         return matNxM();
1112
1113 #ifndef GLSLANG_WEB
1114     case DMAT2:
1115     case DMAT3:
1116     case DMAT4:
1117     case DMAT2X2:
1118     case DMAT2X3:
1119     case DMAT2X4:
1120     case DMAT3X2:
1121     case DMAT3X3:
1122     case DMAT3X4:
1123     case DMAT4X2:
1124     case DMAT4X3:
1125     case DMAT4X4:
1126         return dMat();
1127
1128     case IMAGE1D:
1129     case IIMAGE1D:
1130     case UIMAGE1D:
1131     case IMAGE1DARRAY:
1132     case IIMAGE1DARRAY:
1133     case UIMAGE1DARRAY:
1134     case IMAGE2DRECT:
1135     case IIMAGE2DRECT:
1136     case UIMAGE2DRECT:
1137         afterType = true;
1138         return firstGenerationImage(false);
1139
1140     case IMAGEBUFFER:
1141     case IIMAGEBUFFER:
1142     case UIMAGEBUFFER:
1143         afterType = true;
1144         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1145             parseContext.extensionsTurnedOn(Num_AEP_texture_buffer, AEP_texture_buffer))
1146             return keyword;
1147         return firstGenerationImage(false);
1148
1149     case IMAGE2D:
1150     case IIMAGE2D:
1151     case UIMAGE2D:
1152     case IMAGE3D:
1153     case IIMAGE3D:
1154     case UIMAGE3D:
1155     case IMAGECUBE:
1156     case IIMAGECUBE:
1157     case UIMAGECUBE:
1158     case IMAGE2DARRAY:
1159     case IIMAGE2DARRAY:
1160     case UIMAGE2DARRAY:
1161         afterType = true;
1162         return firstGenerationImage(true);
1163
1164     case IMAGECUBEARRAY:
1165     case IIMAGECUBEARRAY:
1166     case UIMAGECUBEARRAY:
1167         afterType = true;
1168         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1169             parseContext.extensionsTurnedOn(Num_AEP_texture_cube_map_array, AEP_texture_cube_map_array))
1170             return keyword;
1171         return secondGenerationImage();
1172
1173     case IMAGE2DMS:
1174     case IIMAGE2DMS:
1175     case UIMAGE2DMS:
1176     case IMAGE2DMSARRAY:
1177     case IIMAGE2DMSARRAY:
1178     case UIMAGE2DMSARRAY:
1179         afterType = true;
1180         return secondGenerationImage();
1181
1182     case DOUBLE:
1183     case DVEC2:
1184     case DVEC3:
1185     case DVEC4:
1186         afterType = true;
1187         if (parseContext.isEsProfile() || parseContext.version < 150 ||
1188             (!parseContext.symbolTable.atBuiltInLevel() &&
1189               parseContext.version < 400 &&
1190              !parseContext.extensionTurnedOn(E_GL_ARB_gpu_shader_fp64)))
1191             reservedWord();
1192         return keyword;
1193
1194     case INT64_T:
1195     case UINT64_T:
1196     case I64VEC2:
1197     case I64VEC3:
1198     case I64VEC4:
1199     case U64VEC2:
1200     case U64VEC3:
1201     case U64VEC4:
1202         afterType = true;
1203         if (parseContext.symbolTable.atBuiltInLevel() ||
1204             parseContext.extensionTurnedOn(E_GL_ARB_gpu_shader_int64) ||
1205             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1206             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int64))
1207             return keyword;
1208         return identifierOrType();
1209
1210     case INT8_T:
1211     case UINT8_T:
1212     case I8VEC2:
1213     case I8VEC3:
1214     case I8VEC4:
1215     case U8VEC2:
1216     case U8VEC3:
1217     case U8VEC4:
1218         afterType = true;
1219         if (parseContext.symbolTable.atBuiltInLevel() ||
1220             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1221             parseContext.extensionTurnedOn(E_GL_EXT_shader_8bit_storage) ||
1222             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int8))
1223             return keyword;
1224         return identifierOrType();
1225
1226     case INT16_T:
1227     case UINT16_T:
1228     case I16VEC2:
1229     case I16VEC3:
1230     case I16VEC4:
1231     case U16VEC2:
1232     case U16VEC3:
1233     case U16VEC4:
1234         afterType = true;
1235         if (parseContext.symbolTable.atBuiltInLevel() ||
1236             parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_int16) ||
1237             parseContext.extensionTurnedOn(E_GL_EXT_shader_16bit_storage) ||
1238             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1239             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int16))
1240             return keyword;
1241         return identifierOrType();
1242     case INT32_T:
1243     case UINT32_T:
1244     case I32VEC2:
1245     case I32VEC3:
1246     case I32VEC4:
1247     case U32VEC2:
1248     case U32VEC3:
1249     case U32VEC4:
1250         afterType = true;
1251         if (parseContext.symbolTable.atBuiltInLevel() ||
1252             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1253             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int32))
1254             return keyword;
1255         return identifierOrType();
1256     case FLOAT32_T:
1257     case F32VEC2:
1258     case F32VEC3:
1259     case F32VEC4:
1260     case F32MAT2:
1261     case F32MAT3:
1262     case F32MAT4:
1263     case F32MAT2X2:
1264     case F32MAT2X3:
1265     case F32MAT2X4:
1266     case F32MAT3X2:
1267     case F32MAT3X3:
1268     case F32MAT3X4:
1269     case F32MAT4X2:
1270     case F32MAT4X3:
1271     case F32MAT4X4:
1272         afterType = true;
1273         if (parseContext.symbolTable.atBuiltInLevel() ||
1274             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1275             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float32))
1276             return keyword;
1277         return identifierOrType();
1278
1279     case FLOAT64_T:
1280     case F64VEC2:
1281     case F64VEC3:
1282     case F64VEC4:
1283     case F64MAT2:
1284     case F64MAT3:
1285     case F64MAT4:
1286     case F64MAT2X2:
1287     case F64MAT2X3:
1288     case F64MAT2X4:
1289     case F64MAT3X2:
1290     case F64MAT3X3:
1291     case F64MAT3X4:
1292     case F64MAT4X2:
1293     case F64MAT4X3:
1294     case F64MAT4X4:
1295         afterType = true;
1296         if (parseContext.symbolTable.atBuiltInLevel() ||
1297             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1298             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float64))
1299             return keyword;
1300         return identifierOrType();
1301
1302     case FLOAT16_T:
1303     case F16VEC2:
1304     case F16VEC3:
1305     case F16VEC4:
1306         afterType = true;
1307         if (parseContext.symbolTable.atBuiltInLevel() ||
1308             parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_half_float) ||
1309             parseContext.extensionTurnedOn(E_GL_EXT_shader_16bit_storage) ||
1310             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1311             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float16))
1312             return keyword;
1313
1314         return identifierOrType();
1315
1316     case F16MAT2:
1317     case F16MAT3:
1318     case F16MAT4:
1319     case F16MAT2X2:
1320     case F16MAT2X3:
1321     case F16MAT2X4:
1322     case F16MAT3X2:
1323     case F16MAT3X3:
1324     case F16MAT3X4:
1325     case F16MAT4X2:
1326     case F16MAT4X3:
1327     case F16MAT4X4:
1328         afterType = true;
1329         if (parseContext.symbolTable.atBuiltInLevel() ||
1330             parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_half_float) ||
1331             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1332             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float16))
1333             return keyword;
1334
1335         return identifierOrType();
1336
1337     case SAMPLERCUBEARRAY:
1338     case SAMPLERCUBEARRAYSHADOW:
1339     case ISAMPLERCUBEARRAY:
1340     case USAMPLERCUBEARRAY:
1341         afterType = true;
1342         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1343             parseContext.extensionsTurnedOn(Num_AEP_texture_cube_map_array, AEP_texture_cube_map_array))
1344             return keyword;
1345         if (parseContext.isEsProfile() || (parseContext.version < 400 && ! parseContext.extensionTurnedOn(E_GL_ARB_texture_cube_map_array)))
1346             reservedWord();
1347         return keyword;
1348
1349     case TEXTURECUBEARRAY:
1350     case ITEXTURECUBEARRAY:
1351     case UTEXTURECUBEARRAY:
1352         if (parseContext.spvVersion.vulkan > 0)
1353             return keyword;
1354         else
1355             return identifierOrType();
1356 #endif
1357
1358     case UINT:
1359     case UVEC2:
1360     case UVEC3:
1361     case UVEC4:
1362     case SAMPLERCUBESHADOW:
1363     case SAMPLER2DARRAY:
1364     case SAMPLER2DARRAYSHADOW:
1365     case ISAMPLER2D:
1366     case ISAMPLER3D:
1367     case ISAMPLERCUBE:
1368     case ISAMPLER2DARRAY:
1369     case USAMPLER2D:
1370     case USAMPLER3D:
1371     case USAMPLERCUBE:
1372     case USAMPLER2DARRAY:
1373         afterType = true;
1374         return nonreservedKeyword(300, 130);
1375
1376     case SAMPLER3D:
1377         afterType = true;
1378         if (parseContext.isEsProfile() && parseContext.version < 300) {
1379             if (!parseContext.extensionTurnedOn(E_GL_OES_texture_3D))
1380                 reservedWord();
1381         }
1382         return keyword;
1383
1384     case SAMPLER2DSHADOW:
1385         afterType = true;
1386         if (parseContext.isEsProfile() && parseContext.version < 300) {
1387             if (!parseContext.extensionTurnedOn(E_GL_EXT_shadow_samplers))
1388                 reservedWord();
1389         }
1390         return keyword;
1391
1392     case TEXTURE2D:
1393     case TEXTURECUBE:
1394     case TEXTURE2DARRAY:
1395     case ITEXTURE2D:
1396     case ITEXTURE3D:
1397     case ITEXTURECUBE:
1398     case ITEXTURE2DARRAY:
1399     case UTEXTURE2D:
1400     case UTEXTURE3D:
1401     case UTEXTURECUBE:
1402     case UTEXTURE2DARRAY:
1403     case TEXTURE3D:
1404     case SAMPLER:
1405     case SAMPLERSHADOW:
1406         if (parseContext.spvVersion.vulkan > 0)
1407             return keyword;
1408         else
1409             return identifierOrType();
1410
1411 #ifndef GLSLANG_WEB
1412     case ISAMPLER1D:
1413     case ISAMPLER1DARRAY:
1414     case SAMPLER1DARRAYSHADOW:
1415     case USAMPLER1D:
1416     case USAMPLER1DARRAY:
1417         afterType = true;
1418         return es30ReservedFromGLSL(130);
1419     case ISAMPLER2DRECT:
1420     case USAMPLER2DRECT:
1421         afterType = true;
1422         return es30ReservedFromGLSL(140);
1423
1424     case SAMPLERBUFFER:
1425         afterType = true;
1426         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1427             parseContext.extensionsTurnedOn(Num_AEP_texture_buffer, AEP_texture_buffer))
1428             return keyword;
1429         return es30ReservedFromGLSL(130);
1430
1431     case ISAMPLERBUFFER:
1432     case USAMPLERBUFFER:
1433         afterType = true;
1434         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1435             parseContext.extensionsTurnedOn(Num_AEP_texture_buffer, AEP_texture_buffer))
1436             return keyword;
1437         return es30ReservedFromGLSL(140);
1438
1439     case SAMPLER2DMS:
1440     case ISAMPLER2DMS:
1441     case USAMPLER2DMS:
1442         afterType = true;
1443         if (parseContext.isEsProfile() && parseContext.version >= 310)
1444             return keyword;
1445         if (!parseContext.isEsProfile() && (parseContext.version > 140 ||
1446             (parseContext.version == 140 && parseContext.extensionsTurnedOn(1, &E_GL_ARB_texture_multisample))))
1447             return keyword;
1448         return es30ReservedFromGLSL(150);
1449
1450     case SAMPLER2DMSARRAY:
1451     case ISAMPLER2DMSARRAY:
1452     case USAMPLER2DMSARRAY:
1453         afterType = true;
1454         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1455             parseContext.extensionsTurnedOn(1, &E_GL_OES_texture_storage_multisample_2d_array))
1456             return keyword;
1457         if (!parseContext.isEsProfile() && (parseContext.version > 140 ||
1458             (parseContext.version == 140 && parseContext.extensionsTurnedOn(1, &E_GL_ARB_texture_multisample))))
1459             return keyword;
1460         return es30ReservedFromGLSL(150);
1461
1462     case SAMPLER1D:
1463     case SAMPLER1DSHADOW:
1464         afterType = true;
1465         if (parseContext.isEsProfile())
1466             reservedWord();
1467         return keyword;
1468
1469     case SAMPLER2DRECT:
1470     case SAMPLER2DRECTSHADOW:
1471         afterType = true;
1472         if (parseContext.isEsProfile())
1473             reservedWord();
1474         else if (parseContext.version < 140 && ! parseContext.symbolTable.atBuiltInLevel() && ! parseContext.extensionTurnedOn(E_GL_ARB_texture_rectangle)) {
1475             if (parseContext.relaxedErrors())
1476                 parseContext.requireExtensions(loc, 1, &E_GL_ARB_texture_rectangle, "texture-rectangle sampler keyword");
1477             else
1478                 reservedWord();
1479         }
1480         return keyword;
1481
1482     case SAMPLER1DARRAY:
1483         afterType = true;
1484         if (parseContext.isEsProfile() && parseContext.version == 300)
1485             reservedWord();
1486         else if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1487                  (!parseContext.isEsProfile() && parseContext.version < 130))
1488             return identifierOrType();
1489         return keyword;
1490
1491     case SAMPLEREXTERNALOES:
1492         afterType = true;
1493         if (parseContext.symbolTable.atBuiltInLevel() ||
1494             parseContext.extensionTurnedOn(E_GL_OES_EGL_image_external) ||
1495             parseContext.extensionTurnedOn(E_GL_OES_EGL_image_external_essl3))
1496             return keyword;
1497         return identifierOrType();
1498
1499     case SAMPLEREXTERNAL2DY2YEXT:
1500         afterType = true;
1501         if (parseContext.symbolTable.atBuiltInLevel() ||
1502             parseContext.extensionTurnedOn(E_GL_EXT_YUV_target))
1503             return keyword;
1504         return identifierOrType();
1505
1506     case ITEXTURE1DARRAY:
1507     case UTEXTURE1D:
1508     case ITEXTURE1D:
1509     case UTEXTURE1DARRAY:
1510     case TEXTUREBUFFER:
1511     case ITEXTURE2DRECT:
1512     case UTEXTURE2DRECT:
1513     case ITEXTUREBUFFER:
1514     case UTEXTUREBUFFER:
1515     case TEXTURE2DMS:
1516     case ITEXTURE2DMS:
1517     case UTEXTURE2DMS:
1518     case TEXTURE2DMSARRAY:
1519     case ITEXTURE2DMSARRAY:
1520     case UTEXTURE2DMSARRAY:
1521     case TEXTURE1D:
1522     case TEXTURE2DRECT:
1523     case TEXTURE1DARRAY:
1524         if (parseContext.spvVersion.vulkan > 0)
1525             return keyword;
1526         else
1527             return identifierOrType();
1528
1529     case SUBPASSINPUT:
1530     case SUBPASSINPUTMS:
1531     case ISUBPASSINPUT:
1532     case ISUBPASSINPUTMS:
1533     case USUBPASSINPUT:
1534     case USUBPASSINPUTMS:
1535         if (parseContext.spvVersion.vulkan > 0)
1536             return keyword;
1537         else
1538             return identifierOrType();
1539
1540     case F16SAMPLER1D:
1541     case F16SAMPLER2D:
1542     case F16SAMPLER3D:
1543     case F16SAMPLER2DRECT:
1544     case F16SAMPLERCUBE:
1545     case F16SAMPLER1DARRAY:
1546     case F16SAMPLER2DARRAY:
1547     case F16SAMPLERCUBEARRAY:
1548     case F16SAMPLERBUFFER:
1549     case F16SAMPLER2DMS:
1550     case F16SAMPLER2DMSARRAY:
1551     case F16SAMPLER1DSHADOW:
1552     case F16SAMPLER2DSHADOW:
1553     case F16SAMPLER1DARRAYSHADOW:
1554     case F16SAMPLER2DARRAYSHADOW:
1555     case F16SAMPLER2DRECTSHADOW:
1556     case F16SAMPLERCUBESHADOW:
1557     case F16SAMPLERCUBEARRAYSHADOW:
1558
1559     case F16IMAGE1D:
1560     case F16IMAGE2D:
1561     case F16IMAGE3D:
1562     case F16IMAGE2DRECT:
1563     case F16IMAGECUBE:
1564     case F16IMAGE1DARRAY:
1565     case F16IMAGE2DARRAY:
1566     case F16IMAGECUBEARRAY:
1567     case F16IMAGEBUFFER:
1568     case F16IMAGE2DMS:
1569     case F16IMAGE2DMSARRAY:
1570
1571     case F16TEXTURE1D:
1572     case F16TEXTURE2D:
1573     case F16TEXTURE3D:
1574     case F16TEXTURE2DRECT:
1575     case F16TEXTURECUBE:
1576     case F16TEXTURE1DARRAY:
1577     case F16TEXTURE2DARRAY:
1578     case F16TEXTURECUBEARRAY:
1579     case F16TEXTUREBUFFER:
1580     case F16TEXTURE2DMS:
1581     case F16TEXTURE2DMSARRAY:
1582
1583     case F16SUBPASSINPUT:
1584     case F16SUBPASSINPUTMS:
1585         afterType = true;
1586         if (parseContext.symbolTable.atBuiltInLevel() ||
1587             parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_half_float_fetch))
1588             return keyword;
1589         return identifierOrType();
1590
1591     case EXPLICITINTERPAMD:
1592         if (parseContext.extensionTurnedOn(E_GL_AMD_shader_explicit_vertex_parameter))
1593             return keyword;
1594         return identifierOrType();
1595
1596     case PERVERTEXNV:
1597         if ((!parseContext.isEsProfile() && parseContext.version >= 450) ||
1598             parseContext.extensionTurnedOn(E_GL_NV_fragment_shader_barycentric))
1599             return keyword;
1600         return identifierOrType();
1601
1602     case PRECISE:
1603         if ((parseContext.isEsProfile() &&
1604              (parseContext.version >= 320 || parseContext.extensionsTurnedOn(Num_AEP_gpu_shader5, AEP_gpu_shader5))) ||
1605             (!parseContext.isEsProfile() && parseContext.version >= 400))
1606             return keyword;
1607         if (parseContext.isEsProfile() && parseContext.version == 310) {
1608             reservedWord();
1609             return keyword;
1610         }
1611         return identifierOrType();
1612
1613     case PERPRIMITIVENV:
1614     case PERVIEWNV:
1615     case PERTASKNV:
1616         if ((!parseContext.isEsProfile() && parseContext.version >= 450) ||
1617             (parseContext.isEsProfile() && parseContext.version >= 320) ||
1618             parseContext.extensionTurnedOn(E_GL_NV_mesh_shader))
1619             return keyword;
1620         return identifierOrType();
1621
1622     case FCOOPMATNV:
1623         afterType = true;
1624         if (parseContext.symbolTable.atBuiltInLevel() ||
1625             parseContext.extensionTurnedOn(E_GL_NV_cooperative_matrix))
1626             return keyword;
1627         return identifierOrType();
1628
1629     case UCOOPMATNV:
1630     case ICOOPMATNV:
1631         afterType = true;
1632         if (parseContext.symbolTable.atBuiltInLevel() ||
1633             parseContext.extensionTurnedOn(E_GL_NV_integer_cooperative_matrix))
1634             return keyword;
1635         return identifierOrType();
1636
1637     case DEMOTE:
1638         if (parseContext.extensionTurnedOn(E_GL_EXT_demote_to_helper_invocation))
1639             return keyword;
1640         else
1641             return identifierOrType();
1642 #endif
1643
1644     default:
1645         parseContext.infoSink.info.message(EPrefixInternalError, "Unknown glslang keyword", loc);
1646         return 0;
1647     }
1648 }
1649
1650 int TScanContext::identifierOrType()
1651 {
1652     parserToken->sType.lex.string = NewPoolTString(tokenText);
1653     if (field)
1654         return IDENTIFIER;
1655
1656     parserToken->sType.lex.symbol = parseContext.symbolTable.find(*parserToken->sType.lex.string);
1657     if ((afterType == false && afterStruct == false) && parserToken->sType.lex.symbol != nullptr) {
1658         if (const TVariable* variable = parserToken->sType.lex.symbol->getAsVariable()) {
1659             if (variable->isUserType() &&
1660                 // treat redeclaration of forward-declared buffer/uniform reference as an identifier
1661                 !(variable->getType().isReference() && afterBuffer)) {
1662                 afterType = true;
1663
1664                 return TYPE_NAME;
1665             }
1666         }
1667     }
1668
1669     return IDENTIFIER;
1670 }
1671
1672 // Give an error for use of a reserved symbol.
1673 // However, allow built-in declarations to use reserved words, to allow
1674 // extension support before the extension is enabled.
1675 int TScanContext::reservedWord()
1676 {
1677     if (! parseContext.symbolTable.atBuiltInLevel())
1678         parseContext.error(loc, "Reserved word.", tokenText, "", "");
1679
1680     return 0;
1681 }
1682
1683 int TScanContext::identifierOrReserved(bool reserved)
1684 {
1685     if (reserved) {
1686         reservedWord();
1687
1688         return 0;
1689     }
1690
1691     if (parseContext.isForwardCompatible())
1692         parseContext.warn(loc, "using future reserved keyword", tokenText, "");
1693
1694     return identifierOrType();
1695 }
1696
1697 // For keywords that suddenly showed up on non-ES (not previously reserved)
1698 // but then got reserved by ES 3.0.
1699 int TScanContext::es30ReservedFromGLSL(int version)
1700 {
1701     if (parseContext.symbolTable.atBuiltInLevel())
1702         return keyword;
1703
1704     if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1705         (!parseContext.isEsProfile() && parseContext.version < version)) {
1706             if (parseContext.isForwardCompatible())
1707                 parseContext.warn(loc, "future reserved word in ES 300 and keyword in GLSL", tokenText, "");
1708
1709             return identifierOrType();
1710     } else if (parseContext.isEsProfile() && parseContext.version >= 300)
1711         reservedWord();
1712
1713     return keyword;
1714 }
1715
1716 // For a keyword that was never reserved, until it suddenly
1717 // showed up, both in an es version and a non-ES version.
1718 int TScanContext::nonreservedKeyword(int esVersion, int nonEsVersion)
1719 {
1720     if ((parseContext.isEsProfile() && parseContext.version < esVersion) ||
1721         (!parseContext.isEsProfile() && parseContext.version < nonEsVersion)) {
1722         if (parseContext.isForwardCompatible())
1723             parseContext.warn(loc, "using future keyword", tokenText, "");
1724
1725         return identifierOrType();
1726     }
1727
1728     return keyword;
1729 }
1730
1731 int TScanContext::precisionKeyword()
1732 {
1733     if (parseContext.isEsProfile() || parseContext.version >= 130)
1734         return keyword;
1735
1736     if (parseContext.isForwardCompatible())
1737         parseContext.warn(loc, "using ES precision qualifier keyword", tokenText, "");
1738
1739     return identifierOrType();
1740 }
1741
1742 int TScanContext::matNxM()
1743 {
1744     afterType = true;
1745
1746     if (parseContext.version > 110)
1747         return keyword;
1748
1749     if (parseContext.isForwardCompatible())
1750         parseContext.warn(loc, "using future non-square matrix type keyword", tokenText, "");
1751
1752     return identifierOrType();
1753 }
1754
1755 int TScanContext::dMat()
1756 {
1757     afterType = true;
1758
1759     if (parseContext.isEsProfile() && parseContext.version >= 300) {
1760         reservedWord();
1761
1762         return keyword;
1763     }
1764
1765     if (!parseContext.isEsProfile() && (parseContext.version >= 400 ||
1766         parseContext.symbolTable.atBuiltInLevel() ||
1767         (parseContext.version >= 150 && parseContext.extensionTurnedOn(E_GL_ARB_gpu_shader_fp64))))
1768         return keyword;
1769
1770     if (parseContext.isForwardCompatible())
1771         parseContext.warn(loc, "using future type keyword", tokenText, "");
1772
1773     return identifierOrType();
1774 }
1775
1776 int TScanContext::firstGenerationImage(bool inEs310)
1777 {
1778     if (parseContext.symbolTable.atBuiltInLevel() ||
1779         (!parseContext.isEsProfile() && (parseContext.version >= 420 ||
1780          parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store))) ||
1781         (inEs310 && parseContext.isEsProfile() && parseContext.version >= 310))
1782         return keyword;
1783
1784     if ((parseContext.isEsProfile() && parseContext.version >= 300) ||
1785         (!parseContext.isEsProfile() && parseContext.version >= 130)) {
1786         reservedWord();
1787
1788         return keyword;
1789     }
1790
1791     if (parseContext.isForwardCompatible())
1792         parseContext.warn(loc, "using future type keyword", tokenText, "");
1793
1794     return identifierOrType();
1795 }
1796
1797 int TScanContext::secondGenerationImage()
1798 {
1799     if (parseContext.isEsProfile() && parseContext.version >= 310) {
1800         reservedWord();
1801         return keyword;
1802     }
1803
1804     if (parseContext.symbolTable.atBuiltInLevel() ||
1805         (!parseContext.isEsProfile() &&
1806          (parseContext.version >= 420 || parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store))))
1807         return keyword;
1808
1809     if (parseContext.isForwardCompatible())
1810         parseContext.warn(loc, "using future type keyword", tokenText, "");
1811
1812     return identifierOrType();
1813 }
1814
1815 } // end namespace glslang