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.
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  13 //
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  15 //    notice, this list of conditions and the following disclaimer.
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  37 // POSSIBILITY OF SUCH DAMAGE.
  38 //
  39
  40 //
  41 // GLSL scanning, leveraging the scanning done by the preprocessor.
  42 //
  43
  44 #include <cstring>
  45 #include <unordered_map>
  46 #include <unordered_set>
  47
  48 #include "../Include/Types.h"
  49 #include "SymbolTable.h"
  50 #include "ParseHelper.h"
  51 #include "attribute.h"
  52 #include "glslang_tab.cpp.h"
  53 #include "ScanContext.h"
  54 #include "Scan.h"
  55
  56 // preprocessor includes
  57 #include "preprocessor/PpContext.h"
  58 #include "preprocessor/PpTokens.h"
  59
  60 // Required to avoid missing prototype warnings for some compilers
  61 int yylex(YYSTYPE*, glslang::TParseContext&);
  62
  63 namespace glslang {
  64
  65 // read past any white space
  66 void TInputScanner::consumeWhiteSpace(bool& foundNonSpaceTab)
  67 {
  68     int c = peek();  // don't accidentally consume anything other than whitespace
  69     while (c == ' ' || c == '\t' || c == '\r' || c == '\n') {
  70         if (c == '\r' || c == '\n')
  71             foundNonSpaceTab = true;
  72         get();
  73         c = peek();
  74     }
  75 }
  76
  77 // return true if a comment was actually consumed
  78 bool TInputScanner::consumeComment()
  79 {
  80     if (peek() != '/')
  81         return false;
  82
  83     get();  // consume the '/'
  84     int c = peek();
  85     if (c == '/') {
  86
  87         // a '//' style comment
  88         get();  // consume the second '/'
  89         c = get();
  90         do {
  91             while (c != EndOfInput && c != '\\' && c != '\r' && c != '\n')
  92                 c = get();
  93
  94             if (c == EndOfInput || c == '\r' || c == '\n') {
  95                 while (c == '\r' || c == '\n')
  96                     c = get();
  97
  98                 // we reached the end of the comment
  99                 break;
 100             } else {
 101                 // it's a '\', so we need to keep going, after skipping what's escaped
 102
 103                 // read the skipped character
 104                 c = get();
 105
 106                 // if it's a two-character newline, skip both characters
 107                 if (c == '\r' && peek() == '\n')
 108                     get();
 109                 c = get();
 110             }
 111         } while (true);
 112
 113         // put back the last non-comment character
 114         if (c != EndOfInput)
 115             unget();
 116
 117         return true;
 118     } else if (c == '*') {
 119
 120         // a '/*' style comment
 121         get();  // consume the '*'
 122         c = get();
 123         do {
 124             while (c != EndOfInput && c != '*')
 125                 c = get();
 126             if (c == '*') {
 127                 c = get();
 128                 if (c == '/')
 129                     break;  // end of comment
 130                 // not end of comment
 131             } else // end of input
 132                 break;
 133         } while (true);
 134
 135         return true;
 136     } else {
 137         // it's not a comment, put the '/' back
 138         unget();
 139
 140         return false;
 141     }
 142 }
 143
 144 // skip whitespace, then skip a comment, rinse, repeat
 145 void TInputScanner::consumeWhitespaceComment(bool& foundNonSpaceTab)
 146 {
 147     do {
 148         consumeWhiteSpace(foundNonSpaceTab);
 149
 150         // if not starting a comment now, then done
 151         int c = peek();
 152         if (c != '/' || c == EndOfInput)
 153             return;
 154
 155         // skip potential comment
 156         foundNonSpaceTab = true;
 157         if (! consumeComment())
 158             return;
 159
 160     } while (true);
 161 }
 162
 163 // Returns true if there was non-white space (e.g., a comment, newline) before the #version
 164 // or no #version was found; otherwise, returns false.  There is no error case, it always
 165 // succeeds, but will leave version == 0 if no #version was found.
 166 //
 167 // Sets notFirstToken based on whether tokens (beyond white space and comments)
 168 // appeared before the #version.
 169 //
 170 // N.B. does not attempt to leave input in any particular known state.  The assumption
 171 // is that scanning will start anew, following the rules for the chosen version/profile,
 172 // and with a corresponding parsing context.
 173 //
 174 bool TInputScanner::scanVersion(int& version, EProfile& profile, bool& notFirstToken)
 175 {
 176     // This function doesn't have to get all the semantics correct,
 177     // just find the #version if there is a correct one present.
 178     // The preprocessor will have the responsibility of getting all the semantics right.
 179
 180     bool versionNotFirst = false;  // means not first WRT comments and white space, nothing more
 181     notFirstToken = false;         // means not first WRT to real tokens
 182     version = 0;                   // means not found
 183     profile = ENoProfile;
 184
 185     bool foundNonSpaceTab = false;
 186     bool lookingInMiddle = false;
 187     int c;
 188     do {
 189         if (lookingInMiddle) {
 190             notFirstToken = true;
 191             // make forward progress by finishing off the current line plus extra new lines
 192             if (peek() != '\n' && peek() != '\r') {
 193                 do {
 194                     c = get();
 195                 } while (c != EndOfInput && c != '\n' && c != '\r');
 196             }
 197             while (peek() == '\n' || peek() == '\r')
 198                 get();
 199             if (peek() == EndOfInput)
 200                 return true;
 201         }
 202         lookingInMiddle = true;
 203
 204         // Nominal start, skipping the desktop allowed comments and white space, but tracking if
 205         // something else was found for ES:
 206         consumeWhitespaceComment(foundNonSpaceTab);
 207         if (foundNonSpaceTab)
 208             versionNotFirst = true;
 209
 210         // "#"
 211         if (get() != '#') {
 212             versionNotFirst = true;
 213             continue;
 214         }
 215
 216         // whitespace
 217         do {
 218             c = get();
 219         } while (c == ' ' || c == '\t');
 220
 221         // "version"
 222         if (    c != 'v' ||
 223             get() != 'e' ||
 224             get() != 'r' ||
 225             get() != 's' ||
 226             get() != 'i' ||
 227             get() != 'o' ||
 228             get() != 'n') {
 229             versionNotFirst = true;
 230             continue;
 231         }
 232
 233         // whitespace
 234         do {
 235             c = get();
 236         } while (c == ' ' || c == '\t');
 237
 238         // version number
 239         while (c >= '0' && c <= '9') {
 240             version = 10 * version + (c - '0');
 241             c = get();
 242         }
 243         if (version == 0) {
 244             versionNotFirst = true;
 245             continue;
 246         }
 247
 248         // whitespace
 249         while (c == ' ' || c == '\t')
 250             c = get();
 251
 252         // profile
 253         const int maxProfileLength = 13;  // not including any 0
 254         char profileString[maxProfileLength];
 255         int profileLength;
 256         for (profileLength = 0; profileLength < maxProfileLength; ++profileLength) {
 257             if (c == EndOfInput || c == ' ' || c == '\t' || c == '\n' || c == '\r')
 258                 break;
 259             profileString[profileLength] = (char)c;
 260             c = get();
 261         }
 262         if (c != EndOfInput && c != ' ' && c != '\t' && c != '\n' && c != '\r') {
 263             versionNotFirst = true;
 264             continue;
 265         }
 266
 267         if (profileLength == 2 && strncmp(profileString, "es", profileLength) == 0)
 268             profile = EEsProfile;
 269         else if (profileLength == 4 && strncmp(profileString, "core", profileLength) == 0)
 270             profile = ECoreProfile;
 271         else if (profileLength == 13 && strncmp(profileString, "compatibility", profileLength) == 0)
 272             profile = ECompatibilityProfile;
 273
 274         return versionNotFirst;
 275     } while (true);
 276 }
 277
 278 // Fill this in when doing glslang-level scanning, to hand back to the parser.
 279 class TParserToken {
 280 public:
 281     explicit TParserToken(YYSTYPE& b) : sType(b) { }
 282
 283     YYSTYPE& sType;
 284 protected:
 285     TParserToken(TParserToken&);
 286     TParserToken& operator=(TParserToken&);
 287 };
 288
 289 } // end namespace glslang
 290
 291 // This is the function the glslang parser (i.e., bison) calls to get its next token
 292 int yylex(YYSTYPE* glslangTokenDesc, glslang::TParseContext& parseContext)
 293 {
 294     glslang::TParserToken token(*glslangTokenDesc);
 295
 296     return parseContext.getScanContext()->tokenize(parseContext.getPpContext(), token);
 297 }
 298
 299 namespace {
 300
 301 struct str_eq
 302 {
 303     bool operator()(const char* lhs, const char* rhs) const
 304     {
 305         return strcmp(lhs, rhs) == 0;
 306     }
 307 };
 308
 309 struct str_hash
 310 {
 311     size_t operator()(const char* str) const
 312     {
 313         // djb2
 314         unsigned long hash = 5381;
 315         int c;
 316
 317         while ((c = *str++) != 0)
 318             hash = ((hash << 5) + hash) + c;
 319
 320         return hash;
 321     }
 322 };
 323
 324 // A single global usable by all threads, by all versions, by all languages.
 325 // After a single process-level initialization, this is read only and thread safe
 326 std::unordered_map<const char*, int, str_hash, str_eq>* KeywordMap = nullptr;
 327 #ifndef GLSLANG_WEB
 328 std::unordered_set<const char*, str_hash, str_eq>* ReservedSet = nullptr;
 329 #endif
 330
 331 };
 332
 333 namespace glslang {
 334
 335 void TScanContext::fillInKeywordMap()
 336 {
 337     if (KeywordMap != nullptr) {
 338         // this is really an error, as this should called only once per process
 339         // but, the only risk is if two threads called simultaneously
 340         return;
 341     }
 342     KeywordMap = new std::unordered_map<const char*, int, str_hash, str_eq>;
 343
 344     (*KeywordMap)["const"] =                   CONST;
 345     (*KeywordMap)["uniform"] =                 UNIFORM;
 346     (*KeywordMap)["buffer"] =                  BUFFER;
 347     (*KeywordMap)["in"] =                      IN;
 348     (*KeywordMap)["out"] =                     OUT;
 349     (*KeywordMap)["smooth"] =                  SMOOTH;
 350     (*KeywordMap)["flat"] =                    FLAT;
 351     (*KeywordMap)["centroid"] =                CENTROID;
 352     (*KeywordMap)["invariant"] =               INVARIANT;
 353     (*KeywordMap)["packed"] =                  PACKED;
 354     (*KeywordMap)["resource"] =                RESOURCE;
 355     (*KeywordMap)["inout"] =                   INOUT;
 356     (*KeywordMap)["struct"] =                  STRUCT;
 357     (*KeywordMap)["break"] =                   BREAK;
 358     (*KeywordMap)["continue"] =                CONTINUE;
 359     (*KeywordMap)["do"] =                      DO;
 360     (*KeywordMap)["for"] =                     FOR;
 361     (*KeywordMap)["while"] =                   WHILE;
 362     (*KeywordMap)["switch"] =                  SWITCH;
 363     (*KeywordMap)["case"] =                    CASE;
 364     (*KeywordMap)["default"] =                 DEFAULT;
 365     (*KeywordMap)["if"] =                      IF;
 366     (*KeywordMap)["else"] =                    ELSE;
 367     (*KeywordMap)["discard"] =                 DISCARD;
 368     (*KeywordMap)["terminateInvocation"] =     TERMINATE_INVOCATION;
 369     (*KeywordMap)["terminateRayEXT"] =         TERMINATE_RAY;
 370     (*KeywordMap)["ignoreIntersectionEXT"] =   IGNORE_INTERSECTION;
 371     (*KeywordMap)["return"] =                  RETURN;
 372     (*KeywordMap)["void"] =                    VOID;
 373     (*KeywordMap)["bool"] =                    BOOL;
 374     (*KeywordMap)["float"] =                   FLOAT;
 375     (*KeywordMap)["int"] =                     INT;
 376     (*KeywordMap)["bvec2"] =                   BVEC2;
 377     (*KeywordMap)["bvec3"] =                   BVEC3;
 378     (*KeywordMap)["bvec4"] =                   BVEC4;
 379     (*KeywordMap)["vec2"] =                    VEC2;
 380     (*KeywordMap)["vec3"] =                    VEC3;
 381     (*KeywordMap)["vec4"] =                    VEC4;
 382     (*KeywordMap)["ivec2"] =                   IVEC2;
 383     (*KeywordMap)["ivec3"] =                   IVEC3;
 384     (*KeywordMap)["ivec4"] =                   IVEC4;
 385     (*KeywordMap)["mat2"] =                    MAT2;
 386     (*KeywordMap)["mat3"] =                    MAT3;
 387     (*KeywordMap)["mat4"] =                    MAT4;
 388     (*KeywordMap)["true"] =                    BOOLCONSTANT;
 389     (*KeywordMap)["false"] =                   BOOLCONSTANT;
 390     (*KeywordMap)["layout"] =                  LAYOUT;
 391     (*KeywordMap)["shared"] =                  SHARED;
 392     (*KeywordMap)["highp"] =                   HIGH_PRECISION;
 393     (*KeywordMap)["mediump"] =                 MEDIUM_PRECISION;
 394     (*KeywordMap)["lowp"] =                    LOW_PRECISION;
 395     (*KeywordMap)["superp"] =                  SUPERP;
 396     (*KeywordMap)["precision"] =               PRECISION;
 397     (*KeywordMap)["mat2x2"] =                  MAT2X2;
 398     (*KeywordMap)["mat2x3"] =                  MAT2X3;
 399     (*KeywordMap)["mat2x4"] =                  MAT2X4;
 400     (*KeywordMap)["mat3x2"] =                  MAT3X2;
 401     (*KeywordMap)["mat3x3"] =                  MAT3X3;
 402     (*KeywordMap)["mat3x4"] =                  MAT3X4;
 403     (*KeywordMap)["mat4x2"] =                  MAT4X2;
 404     (*KeywordMap)["mat4x3"] =                  MAT4X3;
 405     (*KeywordMap)["mat4x4"] =                  MAT4X4;
 406     (*KeywordMap)["uint"] =                    UINT;
 407     (*KeywordMap)["uvec2"] =                   UVEC2;
 408     (*KeywordMap)["uvec3"] =                   UVEC3;
 409     (*KeywordMap)["uvec4"] =                   UVEC4;
 410
 411 #ifndef GLSLANG_WEB
 412     (*KeywordMap)["nonuniformEXT"] =           NONUNIFORM;
 413     (*KeywordMap)["demote"] =                  DEMOTE;
 414     (*KeywordMap)["attribute"] =               ATTRIBUTE;
 415     (*KeywordMap)["varying"] =                 VARYING;
 416     (*KeywordMap)["noperspective"] =           NOPERSPECTIVE;
 417     (*KeywordMap)["coherent"] =                COHERENT;
 418     (*KeywordMap)["devicecoherent"] =          DEVICECOHERENT;
 419     (*KeywordMap)["queuefamilycoherent"] =     QUEUEFAMILYCOHERENT;
 420     (*KeywordMap)["workgroupcoherent"] =       WORKGROUPCOHERENT;
 421     (*KeywordMap)["subgroupcoherent"] =        SUBGROUPCOHERENT;
 422     (*KeywordMap)["shadercallcoherent"] =      SHADERCALLCOHERENT;
 423     (*KeywordMap)["nonprivate"] =              NONPRIVATE;
 424     (*KeywordMap)["restrict"] =                RESTRICT;
 425     (*KeywordMap)["readonly"] =                READONLY;
 426     (*KeywordMap)["writeonly"] =               WRITEONLY;
 427     (*KeywordMap)["atomic_uint"] =             ATOMIC_UINT;
 428     (*KeywordMap)["volatile"] =                VOLATILE;
 429     (*KeywordMap)["patch"] =                   PATCH;
 430     (*KeywordMap)["sample"] =                  SAMPLE;
 431     (*KeywordMap)["subroutine"] =              SUBROUTINE;
 432     (*KeywordMap)["dmat2"] =                   DMAT2;
 433     (*KeywordMap)["dmat3"] =                   DMAT3;
 434     (*KeywordMap)["dmat4"] =                   DMAT4;
 435     (*KeywordMap)["dmat2x2"] =                 DMAT2X2;
 436     (*KeywordMap)["dmat2x3"] =                 DMAT2X3;
 437     (*KeywordMap)["dmat2x4"] =                 DMAT2X4;
 438     (*KeywordMap)["dmat3x2"] =                 DMAT3X2;
 439     (*KeywordMap)["dmat3x3"] =                 DMAT3X3;
 440     (*KeywordMap)["dmat3x4"] =                 DMAT3X4;
 441     (*KeywordMap)["dmat4x2"] =                 DMAT4X2;
 442     (*KeywordMap)["dmat4x3"] =                 DMAT4X3;
 443     (*KeywordMap)["dmat4x4"] =                 DMAT4X4;
 444     (*KeywordMap)["image1D"] =                 IMAGE1D;
 445     (*KeywordMap)["iimage1D"] =                IIMAGE1D;
 446     (*KeywordMap)["uimage1D"] =                UIMAGE1D;
 447     (*KeywordMap)["image2D"] =                 IMAGE2D;
 448     (*KeywordMap)["iimage2D"] =                IIMAGE2D;
 449     (*KeywordMap)["uimage2D"] =                UIMAGE2D;
 450     (*KeywordMap)["image3D"] =                 IMAGE3D;
 451     (*KeywordMap)["iimage3D"] =                IIMAGE3D;
 452     (*KeywordMap)["uimage3D"] =                UIMAGE3D;
 453     (*KeywordMap)["image2DRect"] =             IMAGE2DRECT;
 454     (*KeywordMap)["iimage2DRect"] =            IIMAGE2DRECT;
 455     (*KeywordMap)["uimage2DRect"] =            UIMAGE2DRECT;
 456     (*KeywordMap)["imageCube"] =               IMAGECUBE;
 457     (*KeywordMap)["iimageCube"] =              IIMAGECUBE;
 458     (*KeywordMap)["uimageCube"] =              UIMAGECUBE;
 459     (*KeywordMap)["imageBuffer"] =             IMAGEBUFFER;
 460     (*KeywordMap)["iimageBuffer"] =            IIMAGEBUFFER;
 461     (*KeywordMap)["uimageBuffer"] =            UIMAGEBUFFER;
 462     (*KeywordMap)["image1DArray"] =            IMAGE1DARRAY;
 463     (*KeywordMap)["iimage1DArray"] =           IIMAGE1DARRAY;
 464     (*KeywordMap)["uimage1DArray"] =           UIMAGE1DARRAY;
 465     (*KeywordMap)["image2DArray"] =            IMAGE2DARRAY;
 466     (*KeywordMap)["iimage2DArray"] =           IIMAGE2DARRAY;
 467     (*KeywordMap)["uimage2DArray"] =           UIMAGE2DARRAY;
 468     (*KeywordMap)["imageCubeArray"] =          IMAGECUBEARRAY;
 469     (*KeywordMap)["iimageCubeArray"] =         IIMAGECUBEARRAY;
 470     (*KeywordMap)["uimageCubeArray"] =         UIMAGECUBEARRAY;
 471     (*KeywordMap)["image2DMS"] =               IMAGE2DMS;
 472     (*KeywordMap)["iimage2DMS"] =              IIMAGE2DMS;
 473     (*KeywordMap)["uimage2DMS"] =              UIMAGE2DMS;
 474     (*KeywordMap)["image2DMSArray"] =          IMAGE2DMSARRAY;
 475     (*KeywordMap)["iimage2DMSArray"] =         IIMAGE2DMSARRAY;
 476     (*KeywordMap)["uimage2DMSArray"] =         UIMAGE2DMSARRAY;
 477     (*KeywordMap)["i64image1D"] =              I64IMAGE1D;
 478     (*KeywordMap)["u64image1D"] =              U64IMAGE1D;
 479     (*KeywordMap)["i64image2D"] =              I64IMAGE2D;
 480     (*KeywordMap)["u64image2D"] =              U64IMAGE2D;
 481     (*KeywordMap)["i64image3D"] =              I64IMAGE3D;
 482     (*KeywordMap)["u64image3D"] =              U64IMAGE3D;
 483     (*KeywordMap)["i64image2DRect"] =          I64IMAGE2DRECT;
 484     (*KeywordMap)["u64image2DRect"] =          U64IMAGE2DRECT;
 485     (*KeywordMap)["i64imageCube"] =            I64IMAGECUBE;
 486     (*KeywordMap)["u64imageCube"] =            U64IMAGECUBE;
 487     (*KeywordMap)["i64imageBuffer"] =          I64IMAGEBUFFER;
 488     (*KeywordMap)["u64imageBuffer"] =          U64IMAGEBUFFER;
 489     (*KeywordMap)["i64image1DArray"] =         I64IMAGE1DARRAY;
 490     (*KeywordMap)["u64image1DArray"] =         U64IMAGE1DARRAY;
 491     (*KeywordMap)["i64image2DArray"] =         I64IMAGE2DARRAY;
 492     (*KeywordMap)["u64image2DArray"] =         U64IMAGE2DARRAY;
 493     (*KeywordMap)["i64imageCubeArray"] =       I64IMAGECUBEARRAY;
 494     (*KeywordMap)["u64imageCubeArray"] =       U64IMAGECUBEARRAY;
 495     (*KeywordMap)["i64image2DMS"] =            I64IMAGE2DMS;
 496     (*KeywordMap)["u64image2DMS"] =            U64IMAGE2DMS;
 497     (*KeywordMap)["i64image2DMSArray"] =       I64IMAGE2DMSARRAY;
 498     (*KeywordMap)["u64image2DMSArray"] =       U64IMAGE2DMSARRAY;
 499     (*KeywordMap)["double"] =                  DOUBLE;
 500     (*KeywordMap)["dvec2"] =                   DVEC2;
 501     (*KeywordMap)["dvec3"] =                   DVEC3;
 502     (*KeywordMap)["dvec4"] =                   DVEC4;
 503     (*KeywordMap)["int64_t"] =                 INT64_T;
 504     (*KeywordMap)["uint64_t"] =                UINT64_T;
 505     (*KeywordMap)["i64vec2"] =                 I64VEC2;
 506     (*KeywordMap)["i64vec3"] =                 I64VEC3;
 507     (*KeywordMap)["i64vec4"] =                 I64VEC4;
 508     (*KeywordMap)["u64vec2"] =                 U64VEC2;
 509     (*KeywordMap)["u64vec3"] =                 U64VEC3;
 510     (*KeywordMap)["u64vec4"] =                 U64VEC4;
 511
 512     // GL_EXT_shader_explicit_arithmetic_types
 513     (*KeywordMap)["int8_t"] =                  INT8_T;
 514     (*KeywordMap)["i8vec2"] =                  I8VEC2;
 515     (*KeywordMap)["i8vec3"] =                  I8VEC3;
 516     (*KeywordMap)["i8vec4"] =                  I8VEC4;
 517     (*KeywordMap)["uint8_t"] =                 UINT8_T;
 518     (*KeywordMap)["u8vec2"] =                  U8VEC2;
 519     (*KeywordMap)["u8vec3"] =                  U8VEC3;
 520     (*KeywordMap)["u8vec4"] =                  U8VEC4;
 521
 522     (*KeywordMap)["int16_t"] =                 INT16_T;
 523     (*KeywordMap)["i16vec2"] =                 I16VEC2;
 524     (*KeywordMap)["i16vec3"] =                 I16VEC3;
 525     (*KeywordMap)["i16vec4"] =                 I16VEC4;
 526     (*KeywordMap)["uint16_t"] =                UINT16_T;
 527     (*KeywordMap)["u16vec2"] =                 U16VEC2;
 528     (*KeywordMap)["u16vec3"] =                 U16VEC3;
 529     (*KeywordMap)["u16vec4"] =                 U16VEC4;
 530
 531     (*KeywordMap)["int32_t"] =                 INT32_T;
 532     (*KeywordMap)["i32vec2"] =                 I32VEC2;
 533     (*KeywordMap)["i32vec3"] =                 I32VEC3;
 534     (*KeywordMap)["i32vec4"] =                 I32VEC4;
 535     (*KeywordMap)["uint32_t"] =                UINT32_T;
 536     (*KeywordMap)["u32vec2"] =                 U32VEC2;
 537     (*KeywordMap)["u32vec3"] =                 U32VEC3;
 538     (*KeywordMap)["u32vec4"] =                 U32VEC4;
 539
 540     (*KeywordMap)["float16_t"] =               FLOAT16_T;
 541     (*KeywordMap)["f16vec2"] =                 F16VEC2;
 542     (*KeywordMap)["f16vec3"] =                 F16VEC3;
 543     (*KeywordMap)["f16vec4"] =                 F16VEC4;
 544     (*KeywordMap)["f16mat2"] =                 F16MAT2;
 545     (*KeywordMap)["f16mat3"] =                 F16MAT3;
 546     (*KeywordMap)["f16mat4"] =                 F16MAT4;
 547     (*KeywordMap)["f16mat2x2"] =               F16MAT2X2;
 548     (*KeywordMap)["f16mat2x3"] =               F16MAT2X3;
 549     (*KeywordMap)["f16mat2x4"] =               F16MAT2X4;
 550     (*KeywordMap)["f16mat3x2"] =               F16MAT3X2;
 551     (*KeywordMap)["f16mat3x3"] =               F16MAT3X3;
 552     (*KeywordMap)["f16mat3x4"] =               F16MAT3X4;
 553     (*KeywordMap)["f16mat4x2"] =               F16MAT4X2;
 554     (*KeywordMap)["f16mat4x3"] =               F16MAT4X3;
 555     (*KeywordMap)["f16mat4x4"] =               F16MAT4X4;
 556
 557     (*KeywordMap)["float32_t"] =               FLOAT32_T;
 558     (*KeywordMap)["f32vec2"] =                 F32VEC2;
 559     (*KeywordMap)["f32vec3"] =                 F32VEC3;
 560     (*KeywordMap)["f32vec4"] =                 F32VEC4;
 561     (*KeywordMap)["f32mat2"] =                 F32MAT2;
 562     (*KeywordMap)["f32mat3"] =                 F32MAT3;
 563     (*KeywordMap)["f32mat4"] =                 F32MAT4;
 564     (*KeywordMap)["f32mat2x2"] =               F32MAT2X2;
 565     (*KeywordMap)["f32mat2x3"] =               F32MAT2X3;
 566     (*KeywordMap)["f32mat2x4"] =               F32MAT2X4;
 567     (*KeywordMap)["f32mat3x2"] =               F32MAT3X2;
 568     (*KeywordMap)["f32mat3x3"] =               F32MAT3X3;
 569     (*KeywordMap)["f32mat3x4"] =               F32MAT3X4;
 570     (*KeywordMap)["f32mat4x2"] =               F32MAT4X2;
 571     (*KeywordMap)["f32mat4x3"] =               F32MAT4X3;
 572     (*KeywordMap)["f32mat4x4"] =               F32MAT4X4;
 573     (*KeywordMap)["float64_t"] =               FLOAT64_T;
 574     (*KeywordMap)["f64vec2"] =                 F64VEC2;
 575     (*KeywordMap)["f64vec3"] =                 F64VEC3;
 576     (*KeywordMap)["f64vec4"] =                 F64VEC4;
 577     (*KeywordMap)["f64mat2"] =                 F64MAT2;
 578     (*KeywordMap)["f64mat3"] =                 F64MAT3;
 579     (*KeywordMap)["f64mat4"] =                 F64MAT4;
 580     (*KeywordMap)["f64mat2x2"] =               F64MAT2X2;
 581     (*KeywordMap)["f64mat2x3"] =               F64MAT2X3;
 582     (*KeywordMap)["f64mat2x4"] =               F64MAT2X4;
 583     (*KeywordMap)["f64mat3x2"] =               F64MAT3X2;
 584     (*KeywordMap)["f64mat3x3"] =               F64MAT3X3;
 585     (*KeywordMap)["f64mat3x4"] =               F64MAT3X4;
 586     (*KeywordMap)["f64mat4x2"] =               F64MAT4X2;
 587     (*KeywordMap)["f64mat4x3"] =               F64MAT4X3;
 588     (*KeywordMap)["f64mat4x4"] =               F64MAT4X4;
 589
 590     // GL_EXT_spirv_intrinsics
 591     (*KeywordMap)["spirv_instruction"] =       SPIRV_INSTRUCTION;
 592     (*KeywordMap)["spirv_execution_mode"] =    SPIRV_EXECUTION_MODE;
 593     (*KeywordMap)["spirv_execution_mode_id"] = SPIRV_EXECUTION_MODE_ID;
 594     (*KeywordMap)["spirv_decorate"] =          SPIRV_DECORATE;
 595     (*KeywordMap)["spirv_decorate_id"] =       SPIRV_DECORATE_ID;
 596     (*KeywordMap)["spirv_decorate_string"] =   SPIRV_DECORATE_STRING;
 597     (*KeywordMap)["spirv_type"] =              SPIRV_TYPE;
 598     (*KeywordMap)["spirv_storage_class"] =     SPIRV_STORAGE_CLASS;
 599     (*KeywordMap)["spirv_by_reference"] =      SPIRV_BY_REFERENCE;
 600     (*KeywordMap)["spirv_literal"] =           SPIRV_LITERAL;
 601 #endif
 602
 603     (*KeywordMap)["sampler2D"] =               SAMPLER2D;
 604     (*KeywordMap)["samplerCube"] =             SAMPLERCUBE;
 605     (*KeywordMap)["samplerCubeShadow"] =       SAMPLERCUBESHADOW;
 606     (*KeywordMap)["sampler2DArray"] =          SAMPLER2DARRAY;
 607     (*KeywordMap)["sampler2DArrayShadow"] =    SAMPLER2DARRAYSHADOW;
 608     (*KeywordMap)["isampler2D"] =              ISAMPLER2D;
 609     (*KeywordMap)["isampler3D"] =              ISAMPLER3D;
 610     (*KeywordMap)["isamplerCube"] =            ISAMPLERCUBE;
 611     (*KeywordMap)["isampler2DArray"] =         ISAMPLER2DARRAY;
 612     (*KeywordMap)["usampler2D"] =              USAMPLER2D;
 613     (*KeywordMap)["usampler3D"] =              USAMPLER3D;
 614     (*KeywordMap)["usamplerCube"] =            USAMPLERCUBE;
 615     (*KeywordMap)["usampler2DArray"] =         USAMPLER2DARRAY;
 616     (*KeywordMap)["sampler3D"] =               SAMPLER3D;
 617     (*KeywordMap)["sampler2DShadow"] =         SAMPLER2DSHADOW;
 618
 619     (*KeywordMap)["texture2D"] =               TEXTURE2D;
 620     (*KeywordMap)["textureCube"] =             TEXTURECUBE;
 621     (*KeywordMap)["texture2DArray"] =          TEXTURE2DARRAY;
 622     (*KeywordMap)["itexture2D"] =              ITEXTURE2D;
 623     (*KeywordMap)["itexture3D"] =              ITEXTURE3D;
 624     (*KeywordMap)["itextureCube"] =            ITEXTURECUBE;
 625     (*KeywordMap)["itexture2DArray"] =         ITEXTURE2DARRAY;
 626     (*KeywordMap)["utexture2D"] =              UTEXTURE2D;
 627     (*KeywordMap)["utexture3D"] =              UTEXTURE3D;
 628     (*KeywordMap)["utextureCube"] =            UTEXTURECUBE;
 629     (*KeywordMap)["utexture2DArray"] =         UTEXTURE2DARRAY;
 630     (*KeywordMap)["texture3D"] =               TEXTURE3D;
 631
 632     (*KeywordMap)["sampler"] =                 SAMPLER;
 633     (*KeywordMap)["samplerShadow"] =           SAMPLERSHADOW;
 634
 635 #ifndef GLSLANG_WEB
 636     (*KeywordMap)["textureCubeArray"] =        TEXTURECUBEARRAY;
 637     (*KeywordMap)["itextureCubeArray"] =       ITEXTURECUBEARRAY;
 638     (*KeywordMap)["utextureCubeArray"] =       UTEXTURECUBEARRAY;
 639     (*KeywordMap)["samplerCubeArray"] =        SAMPLERCUBEARRAY;
 640     (*KeywordMap)["samplerCubeArrayShadow"] =  SAMPLERCUBEARRAYSHADOW;
 641     (*KeywordMap)["isamplerCubeArray"] =       ISAMPLERCUBEARRAY;
 642     (*KeywordMap)["usamplerCubeArray"] =       USAMPLERCUBEARRAY;
 643     (*KeywordMap)["sampler1DArrayShadow"] =    SAMPLER1DARRAYSHADOW;
 644     (*KeywordMap)["isampler1DArray"] =         ISAMPLER1DARRAY;
 645     (*KeywordMap)["usampler1D"] =              USAMPLER1D;
 646     (*KeywordMap)["isampler1D"] =              ISAMPLER1D;
 647     (*KeywordMap)["usampler1DArray"] =         USAMPLER1DARRAY;
 648     (*KeywordMap)["samplerBuffer"] =           SAMPLERBUFFER;
 649     (*KeywordMap)["isampler2DRect"] =          ISAMPLER2DRECT;
 650     (*KeywordMap)["usampler2DRect"] =          USAMPLER2DRECT;
 651     (*KeywordMap)["isamplerBuffer"] =          ISAMPLERBUFFER;
 652     (*KeywordMap)["usamplerBuffer"] =          USAMPLERBUFFER;
 653     (*KeywordMap)["sampler2DMS"] =             SAMPLER2DMS;
 654     (*KeywordMap)["isampler2DMS"] =            ISAMPLER2DMS;
 655     (*KeywordMap)["usampler2DMS"] =            USAMPLER2DMS;
 656     (*KeywordMap)["sampler2DMSArray"] =        SAMPLER2DMSARRAY;
 657     (*KeywordMap)["isampler2DMSArray"] =       ISAMPLER2DMSARRAY;
 658     (*KeywordMap)["usampler2DMSArray"] =       USAMPLER2DMSARRAY;
 659     (*KeywordMap)["sampler1D"] =               SAMPLER1D;
 660     (*KeywordMap)["sampler1DShadow"] =         SAMPLER1DSHADOW;
 661     (*KeywordMap)["sampler2DRect"] =           SAMPLER2DRECT;
 662     (*KeywordMap)["sampler2DRectShadow"] =     SAMPLER2DRECTSHADOW;
 663     (*KeywordMap)["sampler1DArray"] =          SAMPLER1DARRAY;
 664
 665     (*KeywordMap)["samplerExternalOES"] =      SAMPLEREXTERNALOES; // GL_OES_EGL_image_external
 666
 667     (*KeywordMap)["__samplerExternal2DY2YEXT"] = SAMPLEREXTERNAL2DY2YEXT; // GL_EXT_YUV_target
 668
 669     (*KeywordMap)["itexture1DArray"] =         ITEXTURE1DARRAY;
 670     (*KeywordMap)["utexture1D"] =              UTEXTURE1D;
 671     (*KeywordMap)["itexture1D"] =              ITEXTURE1D;
 672     (*KeywordMap)["utexture1DArray"] =         UTEXTURE1DARRAY;
 673     (*KeywordMap)["textureBuffer"] =           TEXTUREBUFFER;
 674     (*KeywordMap)["itexture2DRect"] =          ITEXTURE2DRECT;
 675     (*KeywordMap)["utexture2DRect"] =          UTEXTURE2DRECT;
 676     (*KeywordMap)["itextureBuffer"] =          ITEXTUREBUFFER;
 677     (*KeywordMap)["utextureBuffer"] =          UTEXTUREBUFFER;
 678     (*KeywordMap)["texture2DMS"] =             TEXTURE2DMS;
 679     (*KeywordMap)["itexture2DMS"] =            ITEXTURE2DMS;
 680     (*KeywordMap)["utexture2DMS"] =            UTEXTURE2DMS;
 681     (*KeywordMap)["texture2DMSArray"] =        TEXTURE2DMSARRAY;
 682     (*KeywordMap)["itexture2DMSArray"] =       ITEXTURE2DMSARRAY;
 683     (*KeywordMap)["utexture2DMSArray"] =       UTEXTURE2DMSARRAY;
 684     (*KeywordMap)["texture1D"] =               TEXTURE1D;
 685     (*KeywordMap)["texture2DRect"] =           TEXTURE2DRECT;
 686     (*KeywordMap)["texture1DArray"] =          TEXTURE1DARRAY;
 687
 688     (*KeywordMap)["subpassInput"] =            SUBPASSINPUT;
 689     (*KeywordMap)["subpassInputMS"] =          SUBPASSINPUTMS;
 690     (*KeywordMap)["isubpassInput"] =           ISUBPASSINPUT;
 691     (*KeywordMap)["isubpassInputMS"] =         ISUBPASSINPUTMS;
 692     (*KeywordMap)["usubpassInput"] =           USUBPASSINPUT;
 693     (*KeywordMap)["usubpassInputMS"] =         USUBPASSINPUTMS;
 694
 695     (*KeywordMap)["f16sampler1D"] =                 F16SAMPLER1D;
 696     (*KeywordMap)["f16sampler2D"] =                 F16SAMPLER2D;
 697     (*KeywordMap)["f16sampler3D"] =                 F16SAMPLER3D;
 698     (*KeywordMap)["f16sampler2DRect"] =             F16SAMPLER2DRECT;
 699     (*KeywordMap)["f16samplerCube"] =               F16SAMPLERCUBE;
 700     (*KeywordMap)["f16sampler1DArray"] =            F16SAMPLER1DARRAY;
 701     (*KeywordMap)["f16sampler2DArray"] =            F16SAMPLER2DARRAY;
 702     (*KeywordMap)["f16samplerCubeArray"] =          F16SAMPLERCUBEARRAY;
 703     (*KeywordMap)["f16samplerBuffer"] =             F16SAMPLERBUFFER;
 704     (*KeywordMap)["f16sampler2DMS"] =               F16SAMPLER2DMS;
 705     (*KeywordMap)["f16sampler2DMSArray"] =          F16SAMPLER2DMSARRAY;
 706     (*KeywordMap)["f16sampler1DShadow"] =           F16SAMPLER1DSHADOW;
 707     (*KeywordMap)["f16sampler2DShadow"] =           F16SAMPLER2DSHADOW;
 708     (*KeywordMap)["f16sampler2DRectShadow"] =       F16SAMPLER2DRECTSHADOW;
 709     (*KeywordMap)["f16samplerCubeShadow"] =         F16SAMPLERCUBESHADOW;
 710     (*KeywordMap)["f16sampler1DArrayShadow"] =      F16SAMPLER1DARRAYSHADOW;
 711     (*KeywordMap)["f16sampler2DArrayShadow"] =      F16SAMPLER2DARRAYSHADOW;
 712     (*KeywordMap)["f16samplerCubeArrayShadow"] =    F16SAMPLERCUBEARRAYSHADOW;
 713
 714     (*KeywordMap)["f16image1D"] =                   F16IMAGE1D;
 715     (*KeywordMap)["f16image2D"] =                   F16IMAGE2D;
 716     (*KeywordMap)["f16image3D"] =                   F16IMAGE3D;
 717     (*KeywordMap)["f16image2DRect"] =               F16IMAGE2DRECT;
 718     (*KeywordMap)["f16imageCube"] =                 F16IMAGECUBE;
 719     (*KeywordMap)["f16image1DArray"] =              F16IMAGE1DARRAY;
 720     (*KeywordMap)["f16image2DArray"] =              F16IMAGE2DARRAY;
 721     (*KeywordMap)["f16imageCubeArray"] =            F16IMAGECUBEARRAY;
 722     (*KeywordMap)["f16imageBuffer"] =               F16IMAGEBUFFER;
 723     (*KeywordMap)["f16image2DMS"] =                 F16IMAGE2DMS;
 724     (*KeywordMap)["f16image2DMSArray"] =            F16IMAGE2DMSARRAY;
 725
 726     (*KeywordMap)["f16texture1D"] =                 F16TEXTURE1D;
 727     (*KeywordMap)["f16texture2D"] =                 F16TEXTURE2D;
 728     (*KeywordMap)["f16texture3D"] =                 F16TEXTURE3D;
 729     (*KeywordMap)["f16texture2DRect"] =             F16TEXTURE2DRECT;
 730     (*KeywordMap)["f16textureCube"] =               F16TEXTURECUBE;
 731     (*KeywordMap)["f16texture1DArray"] =            F16TEXTURE1DARRAY;
 732     (*KeywordMap)["f16texture2DArray"] =            F16TEXTURE2DARRAY;
 733     (*KeywordMap)["f16textureCubeArray"] =          F16TEXTURECUBEARRAY;
 734     (*KeywordMap)["f16textureBuffer"] =             F16TEXTUREBUFFER;
 735     (*KeywordMap)["f16texture2DMS"] =               F16TEXTURE2DMS;
 736     (*KeywordMap)["f16texture2DMSArray"] =          F16TEXTURE2DMSARRAY;
 737
 738     (*KeywordMap)["f16subpassInput"] =              F16SUBPASSINPUT;
 739     (*KeywordMap)["f16subpassInputMS"] =            F16SUBPASSINPUTMS;
 740     (*KeywordMap)["__explicitInterpAMD"] =     EXPLICITINTERPAMD;
 741     (*KeywordMap)["pervertexNV"] =             PERVERTEXNV;
 742     (*KeywordMap)["precise"] =                 PRECISE;
 743
 744     (*KeywordMap)["rayPayloadNV"] =            PAYLOADNV;
 745     (*KeywordMap)["rayPayloadEXT"] =           PAYLOADEXT;
 746     (*KeywordMap)["rayPayloadInNV"] =          PAYLOADINNV;
 747     (*KeywordMap)["rayPayloadInEXT"] =         PAYLOADINEXT;
 748     (*KeywordMap)["hitAttributeNV"] =          HITATTRNV;
 749     (*KeywordMap)["hitAttributeEXT"] =         HITATTREXT;
 750     (*KeywordMap)["callableDataNV"] =          CALLDATANV;
 751     (*KeywordMap)["callableDataEXT"] =         CALLDATAEXT;
 752     (*KeywordMap)["callableDataInNV"] =        CALLDATAINNV;
 753     (*KeywordMap)["callableDataInEXT"] =       CALLDATAINEXT;
 754     (*KeywordMap)["accelerationStructureNV"] = ACCSTRUCTNV;
 755     (*KeywordMap)["accelerationStructureEXT"]   = ACCSTRUCTEXT;
 756     (*KeywordMap)["rayQueryEXT"] =              RAYQUERYEXT;
 757     (*KeywordMap)["perprimitiveNV"] =          PERPRIMITIVENV;
 758     (*KeywordMap)["perviewNV"] =               PERVIEWNV;
 759     (*KeywordMap)["taskNV"] =                  PERTASKNV;
 760
 761     (*KeywordMap)["fcoopmatNV"] =              FCOOPMATNV;
 762     (*KeywordMap)["icoopmatNV"] =              ICOOPMATNV;
 763     (*KeywordMap)["ucoopmatNV"] =              UCOOPMATNV;
 764
 765     ReservedSet = new std::unordered_set<const char*, str_hash, str_eq>;
 766
 767     ReservedSet->insert("common");
 768     ReservedSet->insert("partition");
 769     ReservedSet->insert("active");
 770     ReservedSet->insert("asm");
 771     ReservedSet->insert("class");
 772     ReservedSet->insert("union");
 773     ReservedSet->insert("enum");
 774     ReservedSet->insert("typedef");
 775     ReservedSet->insert("template");
 776     ReservedSet->insert("this");
 777     ReservedSet->insert("goto");
 778     ReservedSet->insert("inline");
 779     ReservedSet->insert("noinline");
 780     ReservedSet->insert("public");
 781     ReservedSet->insert("static");
 782     ReservedSet->insert("extern");
 783     ReservedSet->insert("external");
 784     ReservedSet->insert("interface");
 785     ReservedSet->insert("long");
 786     ReservedSet->insert("short");
 787     ReservedSet->insert("half");
 788     ReservedSet->insert("fixed");
 789     ReservedSet->insert("unsigned");
 790     ReservedSet->insert("input");
 791     ReservedSet->insert("output");
 792     ReservedSet->insert("hvec2");
 793     ReservedSet->insert("hvec3");
 794     ReservedSet->insert("hvec4");
 795     ReservedSet->insert("fvec2");
 796     ReservedSet->insert("fvec3");
 797     ReservedSet->insert("fvec4");
 798     ReservedSet->insert("sampler3DRect");
 799     ReservedSet->insert("filter");
 800     ReservedSet->insert("sizeof");
 801     ReservedSet->insert("cast");
 802     ReservedSet->insert("namespace");
 803     ReservedSet->insert("using");
 804 #endif
 805 }
 806
 807 void TScanContext::deleteKeywordMap()
 808 {
 809     delete KeywordMap;
 810     KeywordMap = nullptr;
 811 #ifndef GLSLANG_WEB
 812     delete ReservedSet;
 813     ReservedSet = nullptr;
 814 #endif
 815 }
 816
 817 // Called by yylex to get the next token.
 818 // Returning 0 implies end of input.
 819 int TScanContext::tokenize(TPpContext* pp, TParserToken& token)
 820 {
 821     do {
 822         parserToken = &token;
 823         TPpToken ppToken;
 824         int token = pp->tokenize(ppToken);
 825         if (token == EndOfInput)
 826             return 0;
 827
 828         tokenText = ppToken.name;
 829         loc = ppToken.loc;
 830         parserToken->sType.lex.loc = loc;
 831         switch (token) {
 832         case ';':  afterType = false; afterBuffer = false; return SEMICOLON;
 833         case ',':  afterType = false;   return COMMA;
 834         case ':':                       return COLON;
 835         case '=':  afterType = false;   return EQUAL;
 836         case '(':  afterType = false;   return LEFT_PAREN;
 837         case ')':  afterType = false;   return RIGHT_PAREN;
 838         case '.':  field = true;        return DOT;
 839         case '!':                       return BANG;
 840         case '-':                       return DASH;
 841         case '~':                       return TILDE;
 842         case '+':                       return PLUS;
 843         case '*':                       return STAR;
 844         case '/':                       return SLASH;
 845         case '%':                       return PERCENT;
 846         case '<':                       return LEFT_ANGLE;
 847         case '>':                       return RIGHT_ANGLE;
 848         case '|':                       return VERTICAL_BAR;
 849         case '^':                       return CARET;
 850         case '&':                       return AMPERSAND;
 851         case '?':                       return QUESTION;
 852         case '[':                       return LEFT_BRACKET;
 853         case ']':                       return RIGHT_BRACKET;
 854         case '{':  afterStruct = false; afterBuffer = false; return LEFT_BRACE;
 855         case '}':                       return RIGHT_BRACE;
 856         case '\\':
 857             parseContext.error(loc, "illegal use of escape character", "\\", "");
 858             break;
 859
 860         case PPAtomAddAssign:          return ADD_ASSIGN;
 861         case PPAtomSubAssign:          return SUB_ASSIGN;
 862         case PPAtomMulAssign:          return MUL_ASSIGN;
 863         case PPAtomDivAssign:          return DIV_ASSIGN;
 864         case PPAtomModAssign:          return MOD_ASSIGN;
 865
 866         case PpAtomRight:              return RIGHT_OP;
 867         case PpAtomLeft:               return LEFT_OP;
 868
 869         case PpAtomRightAssign:        return RIGHT_ASSIGN;
 870         case PpAtomLeftAssign:         return LEFT_ASSIGN;
 871         case PpAtomAndAssign:          return AND_ASSIGN;
 872         case PpAtomOrAssign:           return OR_ASSIGN;
 873         case PpAtomXorAssign:          return XOR_ASSIGN;
 874
 875         case PpAtomAnd:                return AND_OP;
 876         case PpAtomOr:                 return OR_OP;
 877         case PpAtomXor:                return XOR_OP;
 878
 879         case PpAtomEQ:                 return EQ_OP;
 880         case PpAtomGE:                 return GE_OP;
 881         case PpAtomNE:                 return NE_OP;
 882         case PpAtomLE:                 return LE_OP;
 883
 884         case PpAtomDecrement:          return DEC_OP;
 885         case PpAtomIncrement:          return INC_OP;
 886
 887         case PpAtomColonColon:
 888             parseContext.error(loc, "not supported", "::", "");
 889             break;
 890
 891         case PpAtomConstString:        parserToken->sType.lex.string = NewPoolTString(tokenText);     return STRING_LITERAL;
 892         case PpAtomConstInt:           parserToken->sType.lex.i    = ppToken.ival;       return INTCONSTANT;
 893         case PpAtomConstUint:          parserToken->sType.lex.i    = ppToken.ival;       return UINTCONSTANT;
 894         case PpAtomConstFloat:         parserToken->sType.lex.d    = ppToken.dval;       return FLOATCONSTANT;
 895 #ifndef GLSLANG_WEB
 896         case PpAtomConstInt16:         parserToken->sType.lex.i    = ppToken.ival;       return INT16CONSTANT;
 897         case PpAtomConstUint16:        parserToken->sType.lex.i    = ppToken.ival;       return UINT16CONSTANT;
 898         case PpAtomConstInt64:         parserToken->sType.lex.i64  = ppToken.i64val;     return INT64CONSTANT;
 899         case PpAtomConstUint64:        parserToken->sType.lex.i64  = ppToken.i64val;     return UINT64CONSTANT;
 900         case PpAtomConstDouble:        parserToken->sType.lex.d    = ppToken.dval;       return DOUBLECONSTANT;
 901         case PpAtomConstFloat16:       parserToken->sType.lex.d    = ppToken.dval;       return FLOAT16CONSTANT;
 902 #endif
 903         case PpAtomIdentifier:
 904         {
 905             int token = tokenizeIdentifier();
 906             field = false;
 907             return token;
 908         }
 909
 910         case EndOfInput:               return 0;
 911
 912         default:
 913             char buf[2];
 914             buf[0] = (char)token;
 915             buf[1] = 0;
 916             parseContext.error(loc, "unexpected token", buf, "");
 917             break;
 918         }
 919     } while (true);
 920 }
 921
 922 int TScanContext::tokenizeIdentifier()
 923 {
 924 #ifndef GLSLANG_WEB
 925     if (ReservedSet->find(tokenText) != ReservedSet->end())
 926         return reservedWord();
 927 #endif
 928
 929     auto it = KeywordMap->find(tokenText);
 930     if (it == KeywordMap->end()) {
 931         // Should have an identifier of some sort
 932         return identifierOrType();
 933     }
 934     keyword = it->second;
 935
 936     switch (keyword) {
 937     case CONST:
 938     case UNIFORM:
 939     case IN:
 940     case OUT:
 941     case INOUT:
 942     case BREAK:
 943     case CONTINUE:
 944     case DO:
 945     case FOR:
 946     case WHILE:
 947     case IF:
 948     case ELSE:
 949     case DISCARD:
 950     case RETURN:
 951     case CASE:
 952         return keyword;
 953
 954     case TERMINATE_INVOCATION:
 955         if (!parseContext.extensionTurnedOn(E_GL_EXT_terminate_invocation))
 956             return identifierOrType();
 957         return keyword;
 958
 959     case TERMINATE_RAY:
 960     case IGNORE_INTERSECTION:
 961         if (!parseContext.extensionTurnedOn(E_GL_EXT_ray_tracing))
 962             return identifierOrType();
 963         return keyword;
 964
 965     case BUFFER:
 966         afterBuffer = true;
 967         if ((parseContext.isEsProfile() && parseContext.version < 310) ||
 968             (!parseContext.isEsProfile() && (parseContext.version < 430 &&
 969             !parseContext.extensionTurnedOn(E_GL_ARB_shader_storage_buffer_object))))
 970             return identifierOrType();
 971         return keyword;
 972
 973     case STRUCT:
 974         afterStruct = true;
 975         return keyword;
 976
 977     case SWITCH:
 978     case DEFAULT:
 979         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
 980             (!parseContext.isEsProfile() && parseContext.version < 130))
 981             reservedWord();
 982         return keyword;
 983
 984     case VOID:
 985     case BOOL:
 986     case FLOAT:
 987     case INT:
 988     case BVEC2:
 989     case BVEC3:
 990     case BVEC4:
 991     case VEC2:
 992     case VEC3:
 993     case VEC4:
 994     case IVEC2:
 995     case IVEC3:
 996     case IVEC4:
 997     case MAT2:
 998     case MAT3:
 999     case MAT4:
1000     case SAMPLER2D:
1001     case SAMPLERCUBE:
1002         afterType = true;
1003         return keyword;
1004
1005     case BOOLCONSTANT:
1006         if (strcmp("true", tokenText) == 0)
1007             parserToken->sType.lex.b = true;
1008         else
1009             parserToken->sType.lex.b = false;
1010         return keyword;
1011
1012     case SMOOTH:
1013         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1014             (!parseContext.isEsProfile() && parseContext.version < 130))
1015             return identifierOrType();
1016         return keyword;
1017     case FLAT:
1018         if (parseContext.isEsProfile() && parseContext.version < 300)
1019             reservedWord();
1020         else if (!parseContext.isEsProfile() && parseContext.version < 130)
1021             return identifierOrType();
1022         return keyword;
1023     case CENTROID:
1024         if (parseContext.version < 120)
1025             return identifierOrType();
1026         return keyword;
1027     case INVARIANT:
1028         if (!parseContext.isEsProfile() && parseContext.version < 120)
1029             return identifierOrType();
1030         return keyword;
1031     case PACKED:
1032         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1033             (!parseContext.isEsProfile() && parseContext.version < 140))
1034             return reservedWord();
1035         return identifierOrType();
1036
1037     case RESOURCE:
1038     {
1039         bool reserved = (parseContext.isEsProfile() && parseContext.version >= 300) ||
1040                         (!parseContext.isEsProfile() && parseContext.version >= 420);
1041         return identifierOrReserved(reserved);
1042     }
1043     case SUPERP:
1044     {
1045         bool reserved = parseContext.isEsProfile() || parseContext.version >= 130;
1046         return identifierOrReserved(reserved);
1047     }
1048
1049 #ifndef GLSLANG_WEB
1050     case NOPERSPECTIVE:
1051         if (parseContext.extensionTurnedOn(E_GL_NV_shader_noperspective_interpolation))
1052             return keyword;
1053         return es30ReservedFromGLSL(130);
1054
1055     case NONUNIFORM:
1056         if (parseContext.extensionTurnedOn(E_GL_EXT_nonuniform_qualifier))
1057             return keyword;
1058         else
1059             return identifierOrType();
1060     case ATTRIBUTE:
1061     case VARYING:
1062         if (parseContext.isEsProfile() && parseContext.version >= 300)
1063             reservedWord();
1064         return keyword;
1065     case PAYLOADNV:
1066     case PAYLOADINNV:
1067     case HITATTRNV:
1068     case CALLDATANV:
1069     case CALLDATAINNV:
1070     case ACCSTRUCTNV:
1071         if (parseContext.symbolTable.atBuiltInLevel() ||
1072             parseContext.extensionTurnedOn(E_GL_NV_ray_tracing))
1073             return keyword;
1074         return identifierOrType();
1075     case PAYLOADEXT:
1076     case PAYLOADINEXT:
1077     case HITATTREXT:
1078     case CALLDATAEXT:
1079     case CALLDATAINEXT:
1080     case ACCSTRUCTEXT:
1081         if (parseContext.symbolTable.atBuiltInLevel() ||
1082             parseContext.extensionTurnedOn(E_GL_EXT_ray_tracing) ||
1083             parseContext.extensionTurnedOn(E_GL_EXT_ray_query))
1084             return keyword;
1085         return identifierOrType();
1086     case RAYQUERYEXT:
1087         if (parseContext.symbolTable.atBuiltInLevel() ||
1088             (!parseContext.isEsProfile() && parseContext.version >= 460
1089                  && parseContext.extensionTurnedOn(E_GL_EXT_ray_query)))
1090             return keyword;
1091         return identifierOrType();
1092     case ATOMIC_UINT:
1093         if ((parseContext.isEsProfile() && parseContext.version >= 310) ||
1094             parseContext.extensionTurnedOn(E_GL_ARB_shader_atomic_counters))
1095             return keyword;
1096         return es30ReservedFromGLSL(420);
1097
1098     case COHERENT:
1099     case DEVICECOHERENT:
1100     case QUEUEFAMILYCOHERENT:
1101     case WORKGROUPCOHERENT:
1102     case SUBGROUPCOHERENT:
1103     case SHADERCALLCOHERENT:
1104     case NONPRIVATE:
1105     case RESTRICT:
1106     case READONLY:
1107     case WRITEONLY:
1108         if (parseContext.isEsProfile() && parseContext.version >= 310)
1109             return keyword;
1110         return es30ReservedFromGLSL(parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store) ? 130 : 420);
1111     case VOLATILE:
1112         if (parseContext.isEsProfile() && parseContext.version >= 310)
1113             return keyword;
1114         if (! parseContext.symbolTable.atBuiltInLevel() && (parseContext.isEsProfile() ||
1115             (parseContext.version < 420 && ! parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store))))
1116             reservedWord();
1117         return keyword;
1118     case PATCH:
1119         if (parseContext.symbolTable.atBuiltInLevel() ||
1120             (parseContext.isEsProfile() &&
1121              (parseContext.version >= 320 ||
1122               parseContext.extensionsTurnedOn(Num_AEP_tessellation_shader, AEP_tessellation_shader))) ||
1123             (!parseContext.isEsProfile() && parseContext.extensionTurnedOn(E_GL_ARB_tessellation_shader)))
1124             return keyword;
1125
1126         return es30ReservedFromGLSL(400);
1127
1128     case SAMPLE:
1129         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1130             parseContext.extensionsTurnedOn(1, &E_GL_OES_shader_multisample_interpolation))
1131             return keyword;
1132         return es30ReservedFromGLSL(400);
1133
1134     case SUBROUTINE:
1135         return es30ReservedFromGLSL(400);
1136 #endif
1137     case SHARED:
1138         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1139             (!parseContext.isEsProfile() && parseContext.version < 140))
1140             return identifierOrType();
1141         return keyword;
1142     case LAYOUT:
1143     {
1144         const int numLayoutExts = 2;
1145         const char* layoutExts[numLayoutExts] = { E_GL_ARB_shading_language_420pack,
1146                                                   E_GL_ARB_explicit_attrib_location };
1147         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1148             (!parseContext.isEsProfile() && parseContext.version < 140 &&
1149             ! parseContext.extensionsTurnedOn(numLayoutExts, layoutExts)))
1150             return identifierOrType();
1151         return keyword;
1152     }
1153
1154     case HIGH_PRECISION:
1155     case MEDIUM_PRECISION:
1156     case LOW_PRECISION:
1157     case PRECISION:
1158         return precisionKeyword();
1159
1160     case MAT2X2:
1161     case MAT2X3:
1162     case MAT2X4:
1163     case MAT3X2:
1164     case MAT3X3:
1165     case MAT3X4:
1166     case MAT4X2:
1167     case MAT4X3:
1168     case MAT4X4:
1169         return matNxM();
1170
1171 #ifndef GLSLANG_WEB
1172     case DMAT2:
1173     case DMAT3:
1174     case DMAT4:
1175     case DMAT2X2:
1176     case DMAT2X3:
1177     case DMAT2X4:
1178     case DMAT3X2:
1179     case DMAT3X3:
1180     case DMAT3X4:
1181     case DMAT4X2:
1182     case DMAT4X3:
1183     case DMAT4X4:
1184         return dMat();
1185
1186     case IMAGE1D:
1187     case IIMAGE1D:
1188     case UIMAGE1D:
1189     case IMAGE1DARRAY:
1190     case IIMAGE1DARRAY:
1191     case UIMAGE1DARRAY:
1192     case IMAGE2DRECT:
1193     case IIMAGE2DRECT:
1194     case UIMAGE2DRECT:
1195         afterType = true;
1196         return firstGenerationImage(false);
1197
1198     case I64IMAGE1D:
1199     case U64IMAGE1D:
1200     case I64IMAGE1DARRAY:
1201     case U64IMAGE1DARRAY:
1202     case I64IMAGE2DRECT:
1203     case U64IMAGE2DRECT:
1204         afterType = true;
1205         if (parseContext.symbolTable.atBuiltInLevel() ||
1206             parseContext.extensionTurnedOn(E_GL_EXT_shader_image_int64)) {
1207             return firstGenerationImage(false);
1208         }
1209         return identifierOrType();
1210
1211     case IMAGEBUFFER:
1212     case IIMAGEBUFFER:
1213     case UIMAGEBUFFER:
1214         afterType = true;
1215         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1216             parseContext.extensionsTurnedOn(Num_AEP_texture_buffer, AEP_texture_buffer))
1217             return keyword;
1218         return firstGenerationImage(false);
1219
1220     case I64IMAGEBUFFER:
1221     case U64IMAGEBUFFER:
1222         afterType = true;
1223         if (parseContext.symbolTable.atBuiltInLevel() ||
1224             parseContext.extensionTurnedOn(E_GL_EXT_shader_image_int64)) {
1225             if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1226                 parseContext.extensionsTurnedOn(Num_AEP_texture_buffer, AEP_texture_buffer))
1227                 return keyword;
1228             return firstGenerationImage(false);
1229         }
1230         return identifierOrType();
1231
1232     case IMAGE2D:
1233     case IIMAGE2D:
1234     case UIMAGE2D:
1235     case IMAGE3D:
1236     case IIMAGE3D:
1237     case UIMAGE3D:
1238     case IMAGECUBE:
1239     case IIMAGECUBE:
1240     case UIMAGECUBE:
1241     case IMAGE2DARRAY:
1242     case IIMAGE2DARRAY:
1243     case UIMAGE2DARRAY:
1244         afterType = true;
1245         return firstGenerationImage(true);
1246
1247     case I64IMAGE2D:
1248     case U64IMAGE2D:
1249     case I64IMAGE3D:
1250     case U64IMAGE3D:
1251     case I64IMAGECUBE:
1252     case U64IMAGECUBE:
1253     case I64IMAGE2DARRAY:
1254     case U64IMAGE2DARRAY:
1255         afterType = true;
1256         if (parseContext.symbolTable.atBuiltInLevel() ||
1257             parseContext.extensionTurnedOn(E_GL_EXT_shader_image_int64))
1258             return firstGenerationImage(true);
1259         return identifierOrType();
1260
1261     case IMAGECUBEARRAY:
1262     case IIMAGECUBEARRAY:
1263     case UIMAGECUBEARRAY:
1264         afterType = true;
1265         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1266             parseContext.extensionsTurnedOn(Num_AEP_texture_cube_map_array, AEP_texture_cube_map_array))
1267             return keyword;
1268         return secondGenerationImage();
1269
1270     case I64IMAGECUBEARRAY:
1271     case U64IMAGECUBEARRAY:
1272         afterType = true;
1273         if (parseContext.symbolTable.atBuiltInLevel() ||
1274             parseContext.extensionTurnedOn(E_GL_EXT_shader_image_int64)) {
1275             if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1276                 parseContext.extensionsTurnedOn(Num_AEP_texture_cube_map_array, AEP_texture_cube_map_array))
1277                 return keyword;
1278             return secondGenerationImage();
1279         }
1280         return identifierOrType();
1281
1282     case IMAGE2DMS:
1283     case IIMAGE2DMS:
1284     case UIMAGE2DMS:
1285     case IMAGE2DMSARRAY:
1286     case IIMAGE2DMSARRAY:
1287     case UIMAGE2DMSARRAY:
1288         afterType = true;
1289         return secondGenerationImage();
1290
1291     case I64IMAGE2DMS:
1292     case U64IMAGE2DMS:
1293     case I64IMAGE2DMSARRAY:
1294     case U64IMAGE2DMSARRAY:
1295         afterType = true;
1296         if (parseContext.symbolTable.atBuiltInLevel() ||
1297             parseContext.extensionTurnedOn(E_GL_EXT_shader_image_int64)) {
1298             return secondGenerationImage();
1299         }
1300         return identifierOrType();
1301
1302     case DOUBLE:
1303     case DVEC2:
1304     case DVEC3:
1305     case DVEC4:
1306         afterType = true;
1307         if (parseContext.isEsProfile() || parseContext.version < 150 ||
1308             (!parseContext.symbolTable.atBuiltInLevel() &&
1309               (parseContext.version < 400 && !parseContext.extensionTurnedOn(E_GL_ARB_gpu_shader_fp64) &&
1310               (parseContext.version < 410 && !parseContext.extensionTurnedOn(E_GL_ARB_vertex_attrib_64bit)))))
1311             reservedWord();
1312         return keyword;
1313
1314     case INT64_T:
1315     case UINT64_T:
1316     case I64VEC2:
1317     case I64VEC3:
1318     case I64VEC4:
1319     case U64VEC2:
1320     case U64VEC3:
1321     case U64VEC4:
1322         afterType = true;
1323         if (parseContext.symbolTable.atBuiltInLevel() ||
1324             parseContext.extensionTurnedOn(E_GL_ARB_gpu_shader_int64) ||
1325             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1326             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int64))
1327             return keyword;
1328         return identifierOrType();
1329
1330     case INT8_T:
1331     case UINT8_T:
1332     case I8VEC2:
1333     case I8VEC3:
1334     case I8VEC4:
1335     case U8VEC2:
1336     case U8VEC3:
1337     case U8VEC4:
1338         afterType = true;
1339         if (parseContext.symbolTable.atBuiltInLevel() ||
1340             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1341             parseContext.extensionTurnedOn(E_GL_EXT_shader_8bit_storage) ||
1342             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int8))
1343             return keyword;
1344         return identifierOrType();
1345
1346     case INT16_T:
1347     case UINT16_T:
1348     case I16VEC2:
1349     case I16VEC3:
1350     case I16VEC4:
1351     case U16VEC2:
1352     case U16VEC3:
1353     case U16VEC4:
1354         afterType = true;
1355         if (parseContext.symbolTable.atBuiltInLevel() ||
1356             parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_int16) ||
1357             parseContext.extensionTurnedOn(E_GL_EXT_shader_16bit_storage) ||
1358             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1359             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int16))
1360             return keyword;
1361         return identifierOrType();
1362     case INT32_T:
1363     case UINT32_T:
1364     case I32VEC2:
1365     case I32VEC3:
1366     case I32VEC4:
1367     case U32VEC2:
1368     case U32VEC3:
1369     case U32VEC4:
1370         afterType = true;
1371         if (parseContext.symbolTable.atBuiltInLevel() ||
1372             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1373             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int32))
1374             return keyword;
1375         return identifierOrType();
1376     case FLOAT32_T:
1377     case F32VEC2:
1378     case F32VEC3:
1379     case F32VEC4:
1380     case F32MAT2:
1381     case F32MAT3:
1382     case F32MAT4:
1383     case F32MAT2X2:
1384     case F32MAT2X3:
1385     case F32MAT2X4:
1386     case F32MAT3X2:
1387     case F32MAT3X3:
1388     case F32MAT3X4:
1389     case F32MAT4X2:
1390     case F32MAT4X3:
1391     case F32MAT4X4:
1392         afterType = true;
1393         if (parseContext.symbolTable.atBuiltInLevel() ||
1394             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1395             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float32))
1396             return keyword;
1397         return identifierOrType();
1398
1399     case FLOAT64_T:
1400     case F64VEC2:
1401     case F64VEC3:
1402     case F64VEC4:
1403     case F64MAT2:
1404     case F64MAT3:
1405     case F64MAT4:
1406     case F64MAT2X2:
1407     case F64MAT2X3:
1408     case F64MAT2X4:
1409     case F64MAT3X2:
1410     case F64MAT3X3:
1411     case F64MAT3X4:
1412     case F64MAT4X2:
1413     case F64MAT4X3:
1414     case F64MAT4X4:
1415         afterType = true;
1416         if (parseContext.symbolTable.atBuiltInLevel() ||
1417             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1418             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float64))
1419             return keyword;
1420         return identifierOrType();
1421
1422     case FLOAT16_T:
1423     case F16VEC2:
1424     case F16VEC3:
1425     case F16VEC4:
1426         afterType = true;
1427         if (parseContext.symbolTable.atBuiltInLevel() ||
1428             parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_half_float) ||
1429             parseContext.extensionTurnedOn(E_GL_EXT_shader_16bit_storage) ||
1430             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1431             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float16))
1432             return keyword;
1433
1434         return identifierOrType();
1435
1436     case F16MAT2:
1437     case F16MAT3:
1438     case F16MAT4:
1439     case F16MAT2X2:
1440     case F16MAT2X3:
1441     case F16MAT2X4:
1442     case F16MAT3X2:
1443     case F16MAT3X3:
1444     case F16MAT3X4:
1445     case F16MAT4X2:
1446     case F16MAT4X3:
1447     case F16MAT4X4:
1448         afterType = true;
1449         if (parseContext.symbolTable.atBuiltInLevel() ||
1450             parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_half_float) ||
1451             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1452             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float16))
1453             return keyword;
1454
1455         return identifierOrType();
1456
1457     case SAMPLERCUBEARRAY:
1458     case SAMPLERCUBEARRAYSHADOW:
1459     case ISAMPLERCUBEARRAY:
1460     case USAMPLERCUBEARRAY:
1461         afterType = true;
1462         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1463             parseContext.extensionsTurnedOn(Num_AEP_texture_cube_map_array, AEP_texture_cube_map_array))
1464             return keyword;
1465         if (parseContext.isEsProfile() || (parseContext.version < 400 && ! parseContext.extensionTurnedOn(E_GL_ARB_texture_cube_map_array)))
1466             reservedWord();
1467         return keyword;
1468
1469     case TEXTURECUBEARRAY:
1470     case ITEXTURECUBEARRAY:
1471     case UTEXTURECUBEARRAY:
1472         if (parseContext.spvVersion.vulkan > 0)
1473             return keyword;
1474         else
1475             return identifierOrType();
1476 #endif
1477
1478     case UINT:
1479     case UVEC2:
1480     case UVEC3:
1481     case UVEC4:
1482     case SAMPLERCUBESHADOW:
1483     case SAMPLER2DARRAY:
1484     case SAMPLER2DARRAYSHADOW:
1485     case ISAMPLER2D:
1486     case ISAMPLER3D:
1487     case ISAMPLERCUBE:
1488     case ISAMPLER2DARRAY:
1489     case USAMPLER2D:
1490     case USAMPLER3D:
1491     case USAMPLERCUBE:
1492     case USAMPLER2DARRAY:
1493         afterType = true;
1494         return nonreservedKeyword(300, 130);
1495
1496     case SAMPLER3D:
1497         afterType = true;
1498         if (parseContext.isEsProfile() && parseContext.version < 300) {
1499             if (!parseContext.extensionTurnedOn(E_GL_OES_texture_3D))
1500                 reservedWord();
1501         }
1502         return keyword;
1503
1504     case SAMPLER2DSHADOW:
1505         afterType = true;
1506         if (parseContext.isEsProfile() && parseContext.version < 300) {
1507             if (!parseContext.extensionTurnedOn(E_GL_EXT_shadow_samplers))
1508                 reservedWord();
1509         }
1510         return keyword;
1511
1512     case TEXTURE2D:
1513     case TEXTURECUBE:
1514     case TEXTURE2DARRAY:
1515     case ITEXTURE2D:
1516     case ITEXTURE3D:
1517     case ITEXTURECUBE:
1518     case ITEXTURE2DARRAY:
1519     case UTEXTURE2D:
1520     case UTEXTURE3D:
1521     case UTEXTURECUBE:
1522     case UTEXTURE2DARRAY:
1523     case TEXTURE3D:
1524     case SAMPLER:
1525     case SAMPLERSHADOW:
1526         if (parseContext.spvVersion.vulkan > 0)
1527             return keyword;
1528         else
1529             return identifierOrType();
1530
1531 #ifndef GLSLANG_WEB
1532     case ISAMPLER1D:
1533     case ISAMPLER1DARRAY:
1534     case SAMPLER1DARRAYSHADOW:
1535     case USAMPLER1D:
1536     case USAMPLER1DARRAY:
1537         afterType = true;
1538         return es30ReservedFromGLSL(130);
1539     case ISAMPLER2DRECT:
1540     case USAMPLER2DRECT:
1541         afterType = true;
1542         return es30ReservedFromGLSL(140);
1543
1544     case SAMPLERBUFFER:
1545         afterType = true;
1546         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1547             parseContext.extensionsTurnedOn(Num_AEP_texture_buffer, AEP_texture_buffer))
1548             return keyword;
1549         return es30ReservedFromGLSL(130);
1550
1551     case ISAMPLERBUFFER:
1552     case USAMPLERBUFFER:
1553         afterType = true;
1554         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1555             parseContext.extensionsTurnedOn(Num_AEP_texture_buffer, AEP_texture_buffer))
1556             return keyword;
1557         return es30ReservedFromGLSL(140);
1558
1559     case SAMPLER2DMS:
1560     case ISAMPLER2DMS:
1561     case USAMPLER2DMS:
1562         afterType = true;
1563         if (parseContext.isEsProfile() && parseContext.version >= 310)
1564             return keyword;
1565         if (!parseContext.isEsProfile() && (parseContext.version > 140 ||
1566             (parseContext.version == 140 && parseContext.extensionsTurnedOn(1, &E_GL_ARB_texture_multisample))))
1567             return keyword;
1568         return es30ReservedFromGLSL(150);
1569
1570     case SAMPLER2DMSARRAY:
1571     case ISAMPLER2DMSARRAY:
1572     case USAMPLER2DMSARRAY:
1573         afterType = true;
1574         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1575             parseContext.extensionsTurnedOn(1, &E_GL_OES_texture_storage_multisample_2d_array))
1576             return keyword;
1577         if (!parseContext.isEsProfile() && (parseContext.version > 140 ||
1578             (parseContext.version == 140 && parseContext.extensionsTurnedOn(1, &E_GL_ARB_texture_multisample))))
1579             return keyword;
1580         return es30ReservedFromGLSL(150);
1581
1582     case SAMPLER1D:
1583     case SAMPLER1DSHADOW:
1584         afterType = true;
1585         if (parseContext.isEsProfile())
1586             reservedWord();
1587         return keyword;
1588
1589     case SAMPLER2DRECT:
1590     case SAMPLER2DRECTSHADOW:
1591         afterType = true;
1592         if (parseContext.isEsProfile())
1593             reservedWord();
1594         else if (parseContext.version < 140 && ! parseContext.symbolTable.atBuiltInLevel() && ! parseContext.extensionTurnedOn(E_GL_ARB_texture_rectangle)) {
1595             if (parseContext.relaxedErrors())
1596                 parseContext.requireExtensions(loc, 1, &E_GL_ARB_texture_rectangle, "texture-rectangle sampler keyword");
1597             else
1598                 reservedWord();
1599         }
1600         return keyword;
1601
1602     case SAMPLER1DARRAY:
1603         afterType = true;
1604         if (parseContext.isEsProfile() && parseContext.version == 300)
1605             reservedWord();
1606         else if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1607                  (!parseContext.isEsProfile() && parseContext.version < 130))
1608             return identifierOrType();
1609         return keyword;
1610
1611     case SAMPLEREXTERNALOES:
1612         afterType = true;
1613         if (parseContext.symbolTable.atBuiltInLevel() ||
1614             parseContext.extensionTurnedOn(E_GL_OES_EGL_image_external) ||
1615             parseContext.extensionTurnedOn(E_GL_OES_EGL_image_external_essl3))
1616             return keyword;
1617         return identifierOrType();
1618
1619     case SAMPLEREXTERNAL2DY2YEXT:
1620         afterType = true;
1621         if (parseContext.symbolTable.atBuiltInLevel() ||
1622             parseContext.extensionTurnedOn(E_GL_EXT_YUV_target))
1623             return keyword;
1624         return identifierOrType();
1625
1626     case ITEXTURE1DARRAY:
1627     case UTEXTURE1D:
1628     case ITEXTURE1D:
1629     case UTEXTURE1DARRAY:
1630     case TEXTUREBUFFER:
1631     case ITEXTURE2DRECT:
1632     case UTEXTURE2DRECT:
1633     case ITEXTUREBUFFER:
1634     case UTEXTUREBUFFER:
1635     case TEXTURE2DMS:
1636     case ITEXTURE2DMS:
1637     case UTEXTURE2DMS:
1638     case TEXTURE2DMSARRAY:
1639     case ITEXTURE2DMSARRAY:
1640     case UTEXTURE2DMSARRAY:
1641     case TEXTURE1D:
1642     case TEXTURE2DRECT:
1643     case TEXTURE1DARRAY:
1644         if (parseContext.spvVersion.vulkan > 0)
1645             return keyword;
1646         else
1647             return identifierOrType();
1648
1649     case SUBPASSINPUT:
1650     case SUBPASSINPUTMS:
1651     case ISUBPASSINPUT:
1652     case ISUBPASSINPUTMS:
1653     case USUBPASSINPUT:
1654     case USUBPASSINPUTMS:
1655         if (parseContext.spvVersion.vulkan > 0)
1656             return keyword;
1657         else
1658             return identifierOrType();
1659
1660     case F16SAMPLER1D:
1661     case F16SAMPLER2D:
1662     case F16SAMPLER3D:
1663     case F16SAMPLER2DRECT:
1664     case F16SAMPLERCUBE:
1665     case F16SAMPLER1DARRAY:
1666     case F16SAMPLER2DARRAY:
1667     case F16SAMPLERCUBEARRAY:
1668     case F16SAMPLERBUFFER:
1669     case F16SAMPLER2DMS:
1670     case F16SAMPLER2DMSARRAY:
1671     case F16SAMPLER1DSHADOW:
1672     case F16SAMPLER2DSHADOW:
1673     case F16SAMPLER1DARRAYSHADOW:
1674     case F16SAMPLER2DARRAYSHADOW:
1675     case F16SAMPLER2DRECTSHADOW:
1676     case F16SAMPLERCUBESHADOW:
1677     case F16SAMPLERCUBEARRAYSHADOW:
1678
1679     case F16IMAGE1D:
1680     case F16IMAGE2D:
1681     case F16IMAGE3D:
1682     case F16IMAGE2DRECT:
1683     case F16IMAGECUBE:
1684     case F16IMAGE1DARRAY:
1685     case F16IMAGE2DARRAY:
1686     case F16IMAGECUBEARRAY:
1687     case F16IMAGEBUFFER:
1688     case F16IMAGE2DMS:
1689     case F16IMAGE2DMSARRAY:
1690
1691     case F16TEXTURE1D:
1692     case F16TEXTURE2D:
1693     case F16TEXTURE3D:
1694     case F16TEXTURE2DRECT:
1695     case F16TEXTURECUBE:
1696     case F16TEXTURE1DARRAY:
1697     case F16TEXTURE2DARRAY:
1698     case F16TEXTURECUBEARRAY:
1699     case F16TEXTUREBUFFER:
1700     case F16TEXTURE2DMS:
1701     case F16TEXTURE2DMSARRAY:
1702
1703     case F16SUBPASSINPUT:
1704     case F16SUBPASSINPUTMS:
1705         afterType = true;
1706         if (parseContext.symbolTable.atBuiltInLevel() ||
1707             parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_half_float_fetch))
1708             return keyword;
1709         return identifierOrType();
1710
1711     case EXPLICITINTERPAMD:
1712         if (parseContext.extensionTurnedOn(E_GL_AMD_shader_explicit_vertex_parameter))
1713             return keyword;
1714         return identifierOrType();
1715
1716     case PERVERTEXNV:
1717         if ((!parseContext.isEsProfile() && parseContext.version >= 450) ||
1718             parseContext.extensionTurnedOn(E_GL_NV_fragment_shader_barycentric))
1719             return keyword;
1720         return identifierOrType();
1721
1722     case PRECISE:
1723         if ((parseContext.isEsProfile() &&
1724              (parseContext.version >= 320 || parseContext.extensionsTurnedOn(Num_AEP_gpu_shader5, AEP_gpu_shader5))) ||
1725             (!parseContext.isEsProfile() && parseContext.version >= 400))
1726             return keyword;
1727         if (parseContext.isEsProfile() && parseContext.version == 310) {
1728             reservedWord();
1729             return keyword;
1730         }
1731         return identifierOrType();
1732
1733     case PERPRIMITIVENV:
1734     case PERVIEWNV:
1735     case PERTASKNV:
1736         if ((!parseContext.isEsProfile() && parseContext.version >= 450) ||
1737             (parseContext.isEsProfile() && parseContext.version >= 320) ||
1738             parseContext.extensionTurnedOn(E_GL_NV_mesh_shader))
1739             return keyword;
1740         return identifierOrType();
1741
1742     case FCOOPMATNV:
1743         afterType = true;
1744         if (parseContext.symbolTable.atBuiltInLevel() ||
1745             parseContext.extensionTurnedOn(E_GL_NV_cooperative_matrix))
1746             return keyword;
1747         return identifierOrType();
1748
1749     case UCOOPMATNV:
1750     case ICOOPMATNV:
1751         afterType = true;
1752         if (parseContext.symbolTable.atBuiltInLevel() ||
1753             parseContext.extensionTurnedOn(E_GL_NV_integer_cooperative_matrix))
1754             return keyword;
1755         return identifierOrType();
1756
1757     case DEMOTE:
1758         if (parseContext.extensionTurnedOn(E_GL_EXT_demote_to_helper_invocation))
1759             return keyword;
1760         else
1761             return identifierOrType();
1762
1763     case SPIRV_INSTRUCTION:
1764     case SPIRV_EXECUTION_MODE:
1765     case SPIRV_EXECUTION_MODE_ID:
1766     case SPIRV_DECORATE:
1767     case SPIRV_DECORATE_ID:
1768     case SPIRV_DECORATE_STRING:
1769     case SPIRV_TYPE:
1770     case SPIRV_STORAGE_CLASS:
1771     case SPIRV_BY_REFERENCE:
1772     case SPIRV_LITERAL:
1773         if (parseContext.symbolTable.atBuiltInLevel() ||
1774             parseContext.extensionTurnedOn(E_GL_EXT_spirv_intrinsics))
1775             return keyword;
1776         return identifierOrType();
1777 #endif
1778
1779     default:
1780         parseContext.infoSink.info.message(EPrefixInternalError, "Unknown glslang keyword", loc);
1781         return 0;
1782     }
1783 }
1784
1785 int TScanContext::identifierOrType()
1786 {
1787     parserToken->sType.lex.string = NewPoolTString(tokenText);
1788     if (field)
1789         return IDENTIFIER;
1790
1791     parserToken->sType.lex.symbol = parseContext.symbolTable.find(*parserToken->sType.lex.string);
1792     if ((afterType == false && afterStruct == false) && parserToken->sType.lex.symbol != nullptr) {
1793         if (const TVariable* variable = parserToken->sType.lex.symbol->getAsVariable()) {
1794             if (variable->isUserType() &&
1795                 // treat redeclaration of forward-declared buffer/uniform reference as an identifier
1796                 !(variable->getType().isReference() && afterBuffer)) {
1797                 afterType = true;
1798
1799                 return TYPE_NAME;
1800             }
1801         }
1802     }
1803
1804     return IDENTIFIER;
1805 }
1806
1807 // Give an error for use of a reserved symbol.
1808 // However, allow built-in declarations to use reserved words, to allow
1809 // extension support before the extension is enabled.
1810 int TScanContext::reservedWord()
1811 {
1812     if (! parseContext.symbolTable.atBuiltInLevel())
1813         parseContext.error(loc, "Reserved word.", tokenText, "", "");
1814
1815     return 0;
1816 }
1817
1818 int TScanContext::identifierOrReserved(bool reserved)
1819 {
1820     if (reserved) {
1821         reservedWord();
1822
1823         return 0;
1824     }
1825
1826     if (parseContext.isForwardCompatible())
1827         parseContext.warn(loc, "using future reserved keyword", tokenText, "");
1828
1829     return identifierOrType();
1830 }
1831
1832 // For keywords that suddenly showed up on non-ES (not previously reserved)
1833 // but then got reserved by ES 3.0.
1834 int TScanContext::es30ReservedFromGLSL(int version)
1835 {
1836     if (parseContext.symbolTable.atBuiltInLevel())
1837         return keyword;
1838
1839     if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1840         (!parseContext.isEsProfile() && parseContext.version < version)) {
1841             if (parseContext.isForwardCompatible())
1842                 parseContext.warn(loc, "future reserved word in ES 300 and keyword in GLSL", tokenText, "");
1843
1844             return identifierOrType();
1845     } else if (parseContext.isEsProfile() && parseContext.version >= 300)
1846         reservedWord();
1847
1848     return keyword;
1849 }
1850
1851 // For a keyword that was never reserved, until it suddenly
1852 // showed up, both in an es version and a non-ES version.
1853 int TScanContext::nonreservedKeyword(int esVersion, int nonEsVersion)
1854 {
1855     if ((parseContext.isEsProfile() && parseContext.version < esVersion) ||
1856         (!parseContext.isEsProfile() && parseContext.version < nonEsVersion)) {
1857         if (parseContext.isForwardCompatible())
1858             parseContext.warn(loc, "using future keyword", tokenText, "");
1859
1860         return identifierOrType();
1861     }
1862
1863     return keyword;
1864 }
1865
1866 int TScanContext::precisionKeyword()
1867 {
1868     if (parseContext.isEsProfile() || parseContext.version >= 130)
1869         return keyword;
1870
1871     if (parseContext.isForwardCompatible())
1872         parseContext.warn(loc, "using ES precision qualifier keyword", tokenText, "");
1873
1874     return identifierOrType();
1875 }
1876
1877 int TScanContext::matNxM()
1878 {
1879     afterType = true;
1880
1881     if (parseContext.version > 110)
1882         return keyword;
1883
1884     if (parseContext.isForwardCompatible())
1885         parseContext.warn(loc, "using future non-square matrix type keyword", tokenText, "");
1886
1887     return identifierOrType();
1888 }
1889
1890 int TScanContext::dMat()
1891 {
1892     afterType = true;
1893
1894     if (parseContext.isEsProfile() && parseContext.version >= 300) {
1895         reservedWord();
1896
1897         return keyword;
1898     }
1899
1900     if (!parseContext.isEsProfile() && (parseContext.version >= 400 ||
1901         parseContext.symbolTable.atBuiltInLevel() ||
1902         (parseContext.version >= 150 && parseContext.extensionTurnedOn(E_GL_ARB_gpu_shader_fp64)) ||
1903         (parseContext.version >= 150 && parseContext.extensionTurnedOn(E_GL_ARB_vertex_attrib_64bit)
1904          && parseContext.language == EShLangVertex)))
1905         return keyword;
1906
1907     if (parseContext.isForwardCompatible())
1908         parseContext.warn(loc, "using future type keyword", tokenText, "");
1909
1910     return identifierOrType();
1911 }
1912
1913 int TScanContext::firstGenerationImage(bool inEs310)
1914 {
1915     if (parseContext.symbolTable.atBuiltInLevel() ||
1916         (!parseContext.isEsProfile() && (parseContext.version >= 420 ||
1917          parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store))) ||
1918         (inEs310 && parseContext.isEsProfile() && parseContext.version >= 310))
1919         return keyword;
1920
1921     if ((parseContext.isEsProfile() && parseContext.version >= 300) ||
1922         (!parseContext.isEsProfile() && parseContext.version >= 130)) {
1923         reservedWord();
1924
1925         return keyword;
1926     }
1927
1928     if (parseContext.isForwardCompatible())
1929         parseContext.warn(loc, "using future type keyword", tokenText, "");
1930
1931     return identifierOrType();
1932 }
1933
1934 int TScanContext::secondGenerationImage()
1935 {
1936     if (parseContext.isEsProfile() && parseContext.version >= 310) {
1937         reservedWord();
1938         return keyword;
1939     }
1940
1941     if (parseContext.symbolTable.atBuiltInLevel() ||
1942         (!parseContext.isEsProfile() &&
1943          (parseContext.version >= 420 || parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store))))
1944         return keyword;
1945
1946     if (parseContext.isForwardCompatible())
1947         parseContext.warn(loc, "using future type keyword", tokenText, "");
1948
1949     return identifierOrType();
1950 }
1951
1952 } // end namespace glslang