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.
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  35 // POSSIBILITY OF SUCH DAMAGE.
  36 //
  37
  38 //
  39 // GLSL scanning, leveraging the scanning done by the preprocessor.
  40 //
  41
  42 #include <cstring>
  43 #include <unordered_map>
  44 #include <unordered_set>
  45
  46 #include "../Include/Types.h"
  47 #include "SymbolTable.h"
  48 #include "ParseHelper.h"
  49 #include "attribute.h"
  50 #include "glslang_tab.cpp.h"
  51 #include "ScanContext.h"
  52 #include "Scan.h"
  53
  54 // preprocessor includes
  55 #include "preprocessor/PpContext.h"
  56 #include "preprocessor/PpTokens.h"
  57
  58 // Required to avoid missing prototype warnings for some compilers
  59 int yylex(YYSTYPE*, glslang::TParseContext&);
  60
  61 namespace glslang {
  62
  63 // read past any white space
  64 void TInputScanner::consumeWhiteSpace(bool& foundNonSpaceTab)
  65 {
  66     int c = peek();  // don't accidentally consume anything other than whitespace
  67     while (c == ' ' || c == '\t' || c == '\r' || c == '\n') {
  68         if (c == '\r' || c == '\n')
  69             foundNonSpaceTab = true;
  70         get();
  71         c = peek();
  72     }
  73 }
  74
  75 // return true if a comment was actually consumed
  76 bool TInputScanner::consumeComment()
  77 {
  78     if (peek() != '/')
  79         return false;
  80
  81     get();  // consume the '/'
  82     int c = peek();
  83     if (c == '/') {
  84
  85         // a '//' style comment
  86         get();  // consume the second '/'
  87         c = get();
  88         do {
  89             while (c != EndOfInput && c != '\\' && c != '\r' && c != '\n')
  90                 c = get();
  91
  92             if (c == EndOfInput || c == '\r' || c == '\n') {
  93                 while (c == '\r' || c == '\n')
  94                     c = get();
  95
  96                 // we reached the end of the comment
  97                 break;
  98             } else {
  99                 // it's a '\', so we need to keep going, after skipping what's escaped
 100
 101                 // read the skipped character
 102                 c = get();
 103
 104                 // if it's a two-character newline, skip both characters
 105                 if (c == '\r' && peek() == '\n')
 106                     get();
 107                 c = get();
 108             }
 109         } while (true);
 110
 111         // put back the last non-comment character
 112         if (c != EndOfInput)
 113             unget();
 114
 115         return true;
 116     } else if (c == '*') {
 117
 118         // a '/*' style comment
 119         get();  // consume the '*'
 120         c = get();
 121         do {
 122             while (c != EndOfInput && c != '*')
 123                 c = get();
 124             if (c == '*') {
 125                 c = get();
 126                 if (c == '/')
 127                     break;  // end of comment
 128                 // not end of comment
 129             } else // end of input
 130                 break;
 131         } while (true);
 132
 133         return true;
 134     } else {
 135         // it's not a comment, put the '/' back
 136         unget();
 137
 138         return false;
 139     }
 140 }
 141
 142 // skip whitespace, then skip a comment, rinse, repeat
 143 void TInputScanner::consumeWhitespaceComment(bool& foundNonSpaceTab)
 144 {
 145     do {
 146         consumeWhiteSpace(foundNonSpaceTab);
 147
 148         // if not starting a comment now, then done
 149         int c = peek();
 150         if (c != '/' || c == EndOfInput)
 151             return;
 152
 153         // skip potential comment
 154         foundNonSpaceTab = true;
 155         if (! consumeComment())
 156             return;
 157
 158     } while (true);
 159 }
 160
 161 // Returns true if there was non-white space (e.g., a comment, newline) before the #version
 162 // or no #version was found; otherwise, returns false.  There is no error case, it always
 163 // succeeds, but will leave version == 0 if no #version was found.
 164 //
 165 // Sets notFirstToken based on whether tokens (beyond white space and comments)
 166 // appeared before the #version.
 167 //
 168 // N.B. does not attempt to leave input in any particular known state.  The assumption
 169 // is that scanning will start anew, following the rules for the chosen version/profile,
 170 // and with a corresponding parsing context.
 171 //
 172 bool TInputScanner::scanVersion(int& version, EProfile& profile, bool& notFirstToken)
 173 {
 174     // This function doesn't have to get all the semantics correct,
 175     // just find the #version if there is a correct one present.
 176     // The preprocessor will have the responsibility of getting all the semantics right.
 177
 178     bool versionNotFirst = false;  // means not first WRT comments and white space, nothing more
 179     notFirstToken = false;         // means not first WRT to real tokens
 180     version = 0;                   // means not found
 181     profile = ENoProfile;
 182
 183     bool foundNonSpaceTab = false;
 184     bool lookingInMiddle = false;
 185     int c;
 186     do {
 187         if (lookingInMiddle) {
 188             notFirstToken = true;
 189             // make forward progress by finishing off the current line plus extra new lines
 190             if (peek() == '\n' || peek() == '\r') {
 191                 while (peek() == '\n' || peek() == '\r')
 192                     get();
 193             } else
 194                 do {
 195                     c = get();
 196                 } while (c != EndOfInput && c != '\n' && c != '\r');
 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)["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)["buffer"] =                  BUFFER;
 414     (*KeywordMap)["coherent"] =                COHERENT;
 415     (*KeywordMap)["devicecoherent"] =          DEVICECOHERENT;
 416     (*KeywordMap)["queuefamilycoherent"] =     QUEUEFAMILYCOHERENT;
 417     (*KeywordMap)["workgroupcoherent"] =       WORKGROUPCOHERENT;
 418     (*KeywordMap)["subgroupcoherent"] =        SUBGROUPCOHERENT;
 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)["samplerCubeArray"] =        SAMPLERCUBEARRAY;
 568     (*KeywordMap)["samplerCubeArrayShadow"] =  SAMPLERCUBEARRAYSHADOW;
 569     (*KeywordMap)["isamplerCubeArray"] =       ISAMPLERCUBEARRAY;
 570     (*KeywordMap)["usamplerCubeArray"] =       USAMPLERCUBEARRAY;
 571     (*KeywordMap)["samplerCubeShadow"] =       SAMPLERCUBESHADOW;
 572     (*KeywordMap)["sampler2DArray"] =          SAMPLER2DARRAY;
 573     (*KeywordMap)["sampler2DArrayShadow"] =    SAMPLER2DARRAYSHADOW;
 574     (*KeywordMap)["isampler2D"] =              ISAMPLER2D;
 575     (*KeywordMap)["isampler3D"] =              ISAMPLER3D;
 576     (*KeywordMap)["isamplerCube"] =            ISAMPLERCUBE;
 577     (*KeywordMap)["isampler2DArray"] =         ISAMPLER2DARRAY;
 578     (*KeywordMap)["usampler2D"] =              USAMPLER2D;
 579     (*KeywordMap)["usampler3D"] =              USAMPLER3D;
 580     (*KeywordMap)["usamplerCube"] =            USAMPLERCUBE;
 581     (*KeywordMap)["usampler2DArray"] =         USAMPLER2DARRAY;
 582     (*KeywordMap)["sampler3D"] =               SAMPLER3D;
 583     (*KeywordMap)["sampler2DShadow"] =         SAMPLER2DSHADOW;
 584
 585 #ifndef GLSLANG_WEB
 586     (*KeywordMap)["sampler1DArrayShadow"] =    SAMPLER1DARRAYSHADOW;
 587     (*KeywordMap)["isampler1DArray"] =         ISAMPLER1DARRAY;
 588     (*KeywordMap)["usampler1D"] =              USAMPLER1D;
 589     (*KeywordMap)["isampler1D"] =              ISAMPLER1D;
 590     (*KeywordMap)["usampler1DArray"] =         USAMPLER1DARRAY;
 591     (*KeywordMap)["samplerBuffer"] =           SAMPLERBUFFER;
 592     (*KeywordMap)["isampler2DRect"] =          ISAMPLER2DRECT;
 593     (*KeywordMap)["usampler2DRect"] =          USAMPLER2DRECT;
 594     (*KeywordMap)["isamplerBuffer"] =          ISAMPLERBUFFER;
 595     (*KeywordMap)["usamplerBuffer"] =          USAMPLERBUFFER;
 596     (*KeywordMap)["sampler2DMS"] =             SAMPLER2DMS;
 597     (*KeywordMap)["isampler2DMS"] =            ISAMPLER2DMS;
 598     (*KeywordMap)["usampler2DMS"] =            USAMPLER2DMS;
 599     (*KeywordMap)["sampler2DMSArray"] =        SAMPLER2DMSARRAY;
 600     (*KeywordMap)["isampler2DMSArray"] =       ISAMPLER2DMSARRAY;
 601     (*KeywordMap)["usampler2DMSArray"] =       USAMPLER2DMSARRAY;
 602     (*KeywordMap)["sampler1D"] =               SAMPLER1D;
 603     (*KeywordMap)["sampler1DShadow"] =         SAMPLER1DSHADOW;
 604     (*KeywordMap)["sampler2DRect"] =           SAMPLER2DRECT;
 605     (*KeywordMap)["sampler2DRectShadow"] =     SAMPLER2DRECTSHADOW;
 606     (*KeywordMap)["sampler1DArray"] =          SAMPLER1DARRAY;
 607
 608     (*KeywordMap)["samplerExternalOES"] =      SAMPLEREXTERNALOES; // GL_OES_EGL_image_external
 609
 610     (*KeywordMap)["__samplerExternal2DY2YEXT"] = SAMPLEREXTERNAL2DY2YEXT; // GL_EXT_YUV_target
 611
 612     (*KeywordMap)["sampler"] =                 SAMPLER;
 613     (*KeywordMap)["samplerShadow"] =           SAMPLERSHADOW;
 614
 615     (*KeywordMap)["texture2D"] =               TEXTURE2D;
 616     (*KeywordMap)["textureCube"] =             TEXTURECUBE;
 617     (*KeywordMap)["textureCubeArray"] =        TEXTURECUBEARRAY;
 618     (*KeywordMap)["itextureCubeArray"] =       ITEXTURECUBEARRAY;
 619     (*KeywordMap)["utextureCubeArray"] =       UTEXTURECUBEARRAY;
 620     (*KeywordMap)["itexture1DArray"] =         ITEXTURE1DARRAY;
 621     (*KeywordMap)["utexture1D"] =              UTEXTURE1D;
 622     (*KeywordMap)["itexture1D"] =              ITEXTURE1D;
 623     (*KeywordMap)["utexture1DArray"] =         UTEXTURE1DARRAY;
 624     (*KeywordMap)["textureBuffer"] =           TEXTUREBUFFER;
 625     (*KeywordMap)["texture2DArray"] =          TEXTURE2DARRAY;
 626     (*KeywordMap)["itexture2D"] =              ITEXTURE2D;
 627     (*KeywordMap)["itexture3D"] =              ITEXTURE3D;
 628     (*KeywordMap)["itextureCube"] =            ITEXTURECUBE;
 629     (*KeywordMap)["itexture2DArray"] =         ITEXTURE2DARRAY;
 630     (*KeywordMap)["utexture2D"] =              UTEXTURE2D;
 631     (*KeywordMap)["utexture3D"] =              UTEXTURE3D;
 632     (*KeywordMap)["utextureCube"] =            UTEXTURECUBE;
 633     (*KeywordMap)["utexture2DArray"] =         UTEXTURE2DARRAY;
 634     (*KeywordMap)["itexture2DRect"] =          ITEXTURE2DRECT;
 635     (*KeywordMap)["utexture2DRect"] =          UTEXTURE2DRECT;
 636     (*KeywordMap)["itextureBuffer"] =          ITEXTUREBUFFER;
 637     (*KeywordMap)["utextureBuffer"] =          UTEXTUREBUFFER;
 638     (*KeywordMap)["texture2DMS"] =             TEXTURE2DMS;
 639     (*KeywordMap)["itexture2DMS"] =            ITEXTURE2DMS;
 640     (*KeywordMap)["utexture2DMS"] =            UTEXTURE2DMS;
 641     (*KeywordMap)["texture2DMSArray"] =        TEXTURE2DMSARRAY;
 642     (*KeywordMap)["itexture2DMSArray"] =       ITEXTURE2DMSARRAY;
 643     (*KeywordMap)["utexture2DMSArray"] =       UTEXTURE2DMSARRAY;
 644     (*KeywordMap)["texture1D"] =               TEXTURE1D;
 645     (*KeywordMap)["texture3D"] =               TEXTURE3D;
 646     (*KeywordMap)["texture2DRect"] =           TEXTURE2DRECT;
 647     (*KeywordMap)["texture1DArray"] =          TEXTURE1DARRAY;
 648
 649     (*KeywordMap)["subpassInput"] =            SUBPASSINPUT;
 650     (*KeywordMap)["subpassInputMS"] =          SUBPASSINPUTMS;
 651     (*KeywordMap)["isubpassInput"] =           ISUBPASSINPUT;
 652     (*KeywordMap)["isubpassInputMS"] =         ISUBPASSINPUTMS;
 653     (*KeywordMap)["usubpassInput"] =           USUBPASSINPUT;
 654     (*KeywordMap)["usubpassInputMS"] =         USUBPASSINPUTMS;
 655
 656     (*KeywordMap)["f16sampler1D"] =                 F16SAMPLER1D;
 657     (*KeywordMap)["f16sampler2D"] =                 F16SAMPLER2D;
 658     (*KeywordMap)["f16sampler3D"] =                 F16SAMPLER3D;
 659     (*KeywordMap)["f16sampler2DRect"] =             F16SAMPLER2DRECT;
 660     (*KeywordMap)["f16samplerCube"] =               F16SAMPLERCUBE;
 661     (*KeywordMap)["f16sampler1DArray"] =            F16SAMPLER1DARRAY;
 662     (*KeywordMap)["f16sampler2DArray"] =            F16SAMPLER2DARRAY;
 663     (*KeywordMap)["f16samplerCubeArray"] =          F16SAMPLERCUBEARRAY;
 664     (*KeywordMap)["f16samplerBuffer"] =             F16SAMPLERBUFFER;
 665     (*KeywordMap)["f16sampler2DMS"] =               F16SAMPLER2DMS;
 666     (*KeywordMap)["f16sampler2DMSArray"] =          F16SAMPLER2DMSARRAY;
 667     (*KeywordMap)["f16sampler1DShadow"] =           F16SAMPLER1DSHADOW;
 668     (*KeywordMap)["f16sampler2DShadow"] =           F16SAMPLER2DSHADOW;
 669     (*KeywordMap)["f16sampler2DRectShadow"] =       F16SAMPLER2DRECTSHADOW;
 670     (*KeywordMap)["f16samplerCubeShadow"] =         F16SAMPLERCUBESHADOW;
 671     (*KeywordMap)["f16sampler1DArrayShadow"] =      F16SAMPLER1DARRAYSHADOW;
 672     (*KeywordMap)["f16sampler2DArrayShadow"] =      F16SAMPLER2DARRAYSHADOW;
 673     (*KeywordMap)["f16samplerCubeArrayShadow"] =    F16SAMPLERCUBEARRAYSHADOW;
 674
 675     (*KeywordMap)["f16image1D"] =                   F16IMAGE1D;
 676     (*KeywordMap)["f16image2D"] =                   F16IMAGE2D;
 677     (*KeywordMap)["f16image3D"] =                   F16IMAGE3D;
 678     (*KeywordMap)["f16image2DRect"] =               F16IMAGE2DRECT;
 679     (*KeywordMap)["f16imageCube"] =                 F16IMAGECUBE;
 680     (*KeywordMap)["f16image1DArray"] =              F16IMAGE1DARRAY;
 681     (*KeywordMap)["f16image2DArray"] =              F16IMAGE2DARRAY;
 682     (*KeywordMap)["f16imageCubeArray"] =            F16IMAGECUBEARRAY;
 683     (*KeywordMap)["f16imageBuffer"] =               F16IMAGEBUFFER;
 684     (*KeywordMap)["f16image2DMS"] =                 F16IMAGE2DMS;
 685     (*KeywordMap)["f16image2DMSArray"] =            F16IMAGE2DMSARRAY;
 686
 687     (*KeywordMap)["f16texture1D"] =                 F16TEXTURE1D;
 688     (*KeywordMap)["f16texture2D"] =                 F16TEXTURE2D;
 689     (*KeywordMap)["f16texture3D"] =                 F16TEXTURE3D;
 690     (*KeywordMap)["f16texture2DRect"] =             F16TEXTURE2DRECT;
 691     (*KeywordMap)["f16textureCube"] =               F16TEXTURECUBE;
 692     (*KeywordMap)["f16texture1DArray"] =            F16TEXTURE1DARRAY;
 693     (*KeywordMap)["f16texture2DArray"] =            F16TEXTURE2DARRAY;
 694     (*KeywordMap)["f16textureCubeArray"] =          F16TEXTURECUBEARRAY;
 695     (*KeywordMap)["f16textureBuffer"] =             F16TEXTUREBUFFER;
 696     (*KeywordMap)["f16texture2DMS"] =               F16TEXTURE2DMS;
 697     (*KeywordMap)["f16texture2DMSArray"] =          F16TEXTURE2DMSARRAY;
 698
 699     (*KeywordMap)["f16subpassInput"] =              F16SUBPASSINPUT;
 700     (*KeywordMap)["f16subpassInputMS"] =            F16SUBPASSINPUTMS;
 701     (*KeywordMap)["__explicitInterpAMD"] =     EXPLICITINTERPAMD;
 702     (*KeywordMap)["pervertexNV"] =             PERVERTEXNV;
 703     (*KeywordMap)["precise"] =                 PRECISE;
 704
 705     (*KeywordMap)["rayPayloadNV"] =            PAYLOADNV;
 706     (*KeywordMap)["rayPayloadInNV"] =          PAYLOADINNV;
 707     (*KeywordMap)["hitAttributeNV"] =          HITATTRNV;
 708     (*KeywordMap)["callableDataNV"] =          CALLDATANV;
 709     (*KeywordMap)["callableDataInNV"] =        CALLDATAINNV;
 710     (*KeywordMap)["accelerationStructureNV"] = ACCSTRUCTNV;
 711     (*KeywordMap)["perprimitiveNV"] =          PERPRIMITIVENV;
 712     (*KeywordMap)["perviewNV"] =               PERVIEWNV;
 713     (*KeywordMap)["taskNV"] =                  PERTASKNV;
 714
 715     (*KeywordMap)["fcoopmatNV"] =              FCOOPMATNV;
 716     (*KeywordMap)["icoopmatNV"] =              ICOOPMATNV;
 717     (*KeywordMap)["ucoopmatNV"] =              UCOOPMATNV;
 718
 719     ReservedSet = new std::unordered_set<const char*, str_hash, str_eq>;
 720
 721     ReservedSet->insert("common");
 722     ReservedSet->insert("partition");
 723     ReservedSet->insert("active");
 724     ReservedSet->insert("asm");
 725     ReservedSet->insert("class");
 726     ReservedSet->insert("union");
 727     ReservedSet->insert("enum");
 728     ReservedSet->insert("typedef");
 729     ReservedSet->insert("template");
 730     ReservedSet->insert("this");
 731     ReservedSet->insert("goto");
 732     ReservedSet->insert("inline");
 733     ReservedSet->insert("noinline");
 734     ReservedSet->insert("public");
 735     ReservedSet->insert("static");
 736     ReservedSet->insert("extern");
 737     ReservedSet->insert("external");
 738     ReservedSet->insert("interface");
 739     ReservedSet->insert("long");
 740     ReservedSet->insert("short");
 741     ReservedSet->insert("half");
 742     ReservedSet->insert("fixed");
 743     ReservedSet->insert("unsigned");
 744     ReservedSet->insert("input");
 745     ReservedSet->insert("output");
 746     ReservedSet->insert("hvec2");
 747     ReservedSet->insert("hvec3");
 748     ReservedSet->insert("hvec4");
 749     ReservedSet->insert("fvec2");
 750     ReservedSet->insert("fvec3");
 751     ReservedSet->insert("fvec4");
 752     ReservedSet->insert("sampler3DRect");
 753     ReservedSet->insert("filter");
 754     ReservedSet->insert("sizeof");
 755     ReservedSet->insert("cast");
 756     ReservedSet->insert("namespace");
 757     ReservedSet->insert("using");
 758 #endif
 759 }
 760
 761 void TScanContext::deleteKeywordMap()
 762 {
 763     delete KeywordMap;
 764     KeywordMap = nullptr;
 765 #ifndef GLSLANG_WEB
 766     delete ReservedSet;
 767     ReservedSet = nullptr;
 768 #endif
 769 }
 770
 771 // Called by yylex to get the next token.
 772 // Returning 0 implies end of input.
 773 int TScanContext::tokenize(TPpContext* pp, TParserToken& token)
 774 {
 775     do {
 776         parserToken = &token;
 777         TPpToken ppToken;
 778         int token = pp->tokenize(ppToken);
 779         if (token == EndOfInput)
 780             return 0;
 781
 782         tokenText = ppToken.name;
 783         loc = ppToken.loc;
 784         parserToken->sType.lex.loc = loc;
 785         switch (token) {
 786         case ';':  afterType = false; afterBuffer = false; return SEMICOLON;
 787         case ',':  afterType = false;   return COMMA;
 788         case ':':                       return COLON;
 789         case '=':  afterType = false;   return EQUAL;
 790         case '(':  afterType = false;   return LEFT_PAREN;
 791         case ')':  afterType = false;   return RIGHT_PAREN;
 792         case '.':  field = true;        return DOT;
 793         case '!':                       return BANG;
 794         case '-':                       return DASH;
 795         case '~':                       return TILDE;
 796         case '+':                       return PLUS;
 797         case '*':                       return STAR;
 798         case '/':                       return SLASH;
 799         case '%':                       return PERCENT;
 800         case '<':                       return LEFT_ANGLE;
 801         case '>':                       return RIGHT_ANGLE;
 802         case '|':                       return VERTICAL_BAR;
 803         case '^':                       return CARET;
 804         case '&':                       return AMPERSAND;
 805         case '?':                       return QUESTION;
 806         case '[':                       return LEFT_BRACKET;
 807         case ']':                       return RIGHT_BRACKET;
 808         case '{':  afterStruct = false; afterBuffer = false; return LEFT_BRACE;
 809         case '}':                       return RIGHT_BRACE;
 810         case '\\':
 811             parseContext.error(loc, "illegal use of escape character", "\\", "");
 812             break;
 813
 814         case PPAtomAddAssign:          return ADD_ASSIGN;
 815         case PPAtomSubAssign:          return SUB_ASSIGN;
 816         case PPAtomMulAssign:          return MUL_ASSIGN;
 817         case PPAtomDivAssign:          return DIV_ASSIGN;
 818         case PPAtomModAssign:          return MOD_ASSIGN;
 819
 820         case PpAtomRight:              return RIGHT_OP;
 821         case PpAtomLeft:               return LEFT_OP;
 822
 823         case PpAtomRightAssign:        return RIGHT_ASSIGN;
 824         case PpAtomLeftAssign:         return LEFT_ASSIGN;
 825         case PpAtomAndAssign:          return AND_ASSIGN;
 826         case PpAtomOrAssign:           return OR_ASSIGN;
 827         case PpAtomXorAssign:          return XOR_ASSIGN;
 828
 829         case PpAtomAnd:                return AND_OP;
 830         case PpAtomOr:                 return OR_OP;
 831         case PpAtomXor:                return XOR_OP;
 832
 833         case PpAtomEQ:                 return EQ_OP;
 834         case PpAtomGE:                 return GE_OP;
 835         case PpAtomNE:                 return NE_OP;
 836         case PpAtomLE:                 return LE_OP;
 837
 838         case PpAtomDecrement:          return DEC_OP;
 839         case PpAtomIncrement:          return INC_OP;
 840
 841         case PpAtomColonColon:
 842             parseContext.error(loc, "not supported", "::", "");
 843             break;
 844
 845         case PpAtomConstInt:           parserToken->sType.lex.i    = ppToken.ival;       return INTCONSTANT;
 846         case PpAtomConstUint:          parserToken->sType.lex.i    = ppToken.ival;       return UINTCONSTANT;
 847         case PpAtomConstFloat:         parserToken->sType.lex.d    = ppToken.dval;       return FLOATCONSTANT;
 848 #ifndef GLSLANG_WEB
 849         case PpAtomConstInt16:         parserToken->sType.lex.i    = ppToken.ival;       return INT16CONSTANT;
 850         case PpAtomConstUint16:        parserToken->sType.lex.i    = ppToken.ival;       return UINT16CONSTANT;
 851         case PpAtomConstInt64:         parserToken->sType.lex.i64  = ppToken.i64val;     return INT64CONSTANT;
 852         case PpAtomConstUint64:        parserToken->sType.lex.i64  = ppToken.i64val;     return UINT64CONSTANT;
 853         case PpAtomConstDouble:        parserToken->sType.lex.d    = ppToken.dval;       return DOUBLECONSTANT;
 854         case PpAtomConstFloat16:       parserToken->sType.lex.d    = ppToken.dval;       return FLOAT16CONSTANT;
 855 #endif
 856         case PpAtomIdentifier:
 857         {
 858             int token = tokenizeIdentifier();
 859             field = false;
 860             return token;
 861         }
 862
 863         case EndOfInput:               return 0;
 864
 865         default:
 866             char buf[2];
 867             buf[0] = (char)token;
 868             buf[1] = 0;
 869             parseContext.error(loc, "unexpected token", buf, "");
 870             break;
 871         }
 872     } while (true);
 873 }
 874
 875 int TScanContext::tokenizeIdentifier()
 876 {
 877 #ifndef GLSLANG_WEB
 878     if (ReservedSet->find(tokenText) != ReservedSet->end())
 879         return reservedWord();
 880 #endif
 881
 882     auto it = KeywordMap->find(tokenText);
 883     if (it == KeywordMap->end()) {
 884         // Should have an identifier of some sort
 885         return identifierOrType();
 886     }
 887     keyword = it->second;
 888
 889     switch (keyword) {
 890     case CONST:
 891     case UNIFORM:
 892     case IN:
 893     case OUT:
 894     case INOUT:
 895     case BREAK:
 896     case CONTINUE:
 897     case DO:
 898     case FOR:
 899     case WHILE:
 900     case IF:
 901     case ELSE:
 902     case DISCARD:
 903     case RETURN:
 904     case CASE:
 905         return keyword;
 906
 907     case STRUCT:
 908         afterStruct = true;
 909         return keyword;
 910
 911     case SWITCH:
 912     case DEFAULT:
 913         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
 914             (!parseContext.isEsProfile() && parseContext.version < 130))
 915             reservedWord();
 916         return keyword;
 917
 918     case VOID:
 919     case BOOL:
 920     case FLOAT:
 921     case INT:
 922     case BVEC2:
 923     case BVEC3:
 924     case BVEC4:
 925     case VEC2:
 926     case VEC3:
 927     case VEC4:
 928     case IVEC2:
 929     case IVEC3:
 930     case IVEC4:
 931     case MAT2:
 932     case MAT3:
 933     case MAT4:
 934     case SAMPLER2D:
 935     case SAMPLERCUBE:
 936         afterType = true;
 937         return keyword;
 938
 939     case BOOLCONSTANT:
 940         if (strcmp("true", tokenText) == 0)
 941             parserToken->sType.lex.b = true;
 942         else
 943             parserToken->sType.lex.b = false;
 944         return keyword;
 945
 946     case SMOOTH:
 947         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
 948             (!parseContext.isEsProfile() && parseContext.version < 130))
 949             return identifierOrType();
 950         return keyword;
 951     case FLAT:
 952         if (parseContext.isEsProfile() && parseContext.version < 300)
 953             reservedWord();
 954         else if (!parseContext.isEsProfile() && parseContext.version < 130)
 955             return identifierOrType();
 956         return keyword;
 957     case CENTROID:
 958         if (parseContext.version < 120)
 959             return identifierOrType();
 960         return keyword;
 961     case INVARIANT:
 962         if (!parseContext.isEsProfile() && parseContext.version < 120)
 963             return identifierOrType();
 964         return keyword;
 965     case PACKED:
 966         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
 967             (!parseContext.isEsProfile() && parseContext.version < 330))
 968             return reservedWord();
 969         return identifierOrType();
 970
 971     case RESOURCE:
 972     {
 973         bool reserved = (parseContext.isEsProfile() && parseContext.version >= 300) ||
 974                         (!parseContext.isEsProfile() && parseContext.version >= 420);
 975         return identifierOrReserved(reserved);
 976     }
 977     case SUPERP:
 978     {
 979         bool reserved = parseContext.isEsProfile() || parseContext.version >= 130;
 980         return identifierOrReserved(reserved);
 981     }
 982
 983 #ifndef GLSLANG_WEB
 984     case NOPERSPECTIVE:
 985         if (parseContext.isEsProfile() && parseContext.version >= 300 &&
 986             parseContext.extensionTurnedOn(E_GL_NV_shader_noperspective_interpolation))
 987             return keyword;
 988         return es30ReservedFromGLSL(130);
 989
 990     case NONUNIFORM:
 991         if (parseContext.extensionTurnedOn(E_GL_EXT_nonuniform_qualifier))
 992             return keyword;
 993         else
 994             return identifierOrType();
 995     case ATTRIBUTE:
 996     case VARYING:
 997         if (parseContext.isEsProfile() && parseContext.version >= 300)
 998             reservedWord();
 999         return keyword;
1000     case BUFFER:
1001         afterBuffer = true;
1002         if ((parseContext.isEsProfile() && parseContext.version < 310) ||
1003             (!parseContext.isEsProfile() && parseContext.version < 430))
1004             return identifierOrType();
1005         return keyword;
1006     case PAYLOADNV:
1007     case PAYLOADINNV:
1008     case HITATTRNV:
1009     case CALLDATANV:
1010     case CALLDATAINNV:
1011     case ACCSTRUCTNV:
1012         if (parseContext.symbolTable.atBuiltInLevel() ||
1013             (!parseContext.isEsProfile() && parseContext.version >= 460
1014                  && parseContext.extensionTurnedOn(E_GL_NV_ray_tracing)))
1015             return keyword;
1016         return identifierOrType();
1017     case ATOMIC_UINT:
1018         if ((parseContext.isEsProfile() && parseContext.version >= 310) ||
1019             parseContext.extensionTurnedOn(E_GL_ARB_shader_atomic_counters))
1020             return keyword;
1021         return es30ReservedFromGLSL(420);
1022
1023     case COHERENT:
1024     case DEVICECOHERENT:
1025     case QUEUEFAMILYCOHERENT:
1026     case WORKGROUPCOHERENT:
1027     case SUBGROUPCOHERENT:
1028     case NONPRIVATE:
1029     case RESTRICT:
1030     case READONLY:
1031     case WRITEONLY:
1032         if (parseContext.isEsProfile() && parseContext.version >= 310)
1033             return keyword;
1034         return es30ReservedFromGLSL(parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store) ? 130 : 420);
1035     case VOLATILE:
1036         if (parseContext.isEsProfile() && parseContext.version >= 310)
1037             return keyword;
1038         if (! parseContext.symbolTable.atBuiltInLevel() && (parseContext.isEsProfile() ||
1039             (parseContext.version < 420 && ! parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store))))
1040             reservedWord();
1041         return keyword;
1042     case PATCH:
1043         if (parseContext.symbolTable.atBuiltInLevel() ||
1044             (parseContext.isEsProfile() &&
1045              (parseContext.version >= 320 ||
1046               parseContext.extensionsTurnedOn(Num_AEP_tessellation_shader, AEP_tessellation_shader))) ||
1047             (!parseContext.isEsProfile() && parseContext.extensionTurnedOn(E_GL_ARB_tessellation_shader)))
1048             return keyword;
1049
1050         return es30ReservedFromGLSL(400);
1051
1052     case SAMPLE:
1053         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1054             parseContext.extensionsTurnedOn(1, &E_GL_OES_shader_multisample_interpolation))
1055             return keyword;
1056         return es30ReservedFromGLSL(400);
1057
1058     case SUBROUTINE:
1059         return es30ReservedFromGLSL(400);
1060     case SHARED:
1061         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1062             (!parseContext.isEsProfile() && parseContext.version < 140))
1063             return identifierOrType();
1064         return keyword;
1065 #endif
1066
1067     case LAYOUT:
1068     {
1069         const int numLayoutExts = 2;
1070         const char* layoutExts[numLayoutExts] = { E_GL_ARB_shading_language_420pack,
1071                                                   E_GL_ARB_explicit_attrib_location };
1072         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1073             (!parseContext.isEsProfile() && parseContext.version < 140 &&
1074             ! parseContext.extensionsTurnedOn(numLayoutExts, layoutExts)))
1075             return identifierOrType();
1076         return keyword;
1077     }
1078
1079     case HIGH_PRECISION:
1080     case MEDIUM_PRECISION:
1081     case LOW_PRECISION:
1082     case PRECISION:
1083         return precisionKeyword();
1084
1085     case MAT2X2:
1086     case MAT2X3:
1087     case MAT2X4:
1088     case MAT3X2:
1089     case MAT3X3:
1090     case MAT3X4:
1091     case MAT4X2:
1092     case MAT4X3:
1093     case MAT4X4:
1094         return matNxM();
1095
1096 #ifndef GLSLANG_WEB
1097     case DMAT2:
1098     case DMAT3:
1099     case DMAT4:
1100     case DMAT2X2:
1101     case DMAT2X3:
1102     case DMAT2X4:
1103     case DMAT3X2:
1104     case DMAT3X3:
1105     case DMAT3X4:
1106     case DMAT4X2:
1107     case DMAT4X3:
1108     case DMAT4X4:
1109         return dMat();
1110
1111     case IMAGE1D:
1112     case IIMAGE1D:
1113     case UIMAGE1D:
1114     case IMAGE1DARRAY:
1115     case IIMAGE1DARRAY:
1116     case UIMAGE1DARRAY:
1117     case IMAGE2DRECT:
1118     case IIMAGE2DRECT:
1119     case UIMAGE2DRECT:
1120         afterType = true;
1121         return firstGenerationImage(false);
1122
1123     case IMAGEBUFFER:
1124     case IIMAGEBUFFER:
1125     case UIMAGEBUFFER:
1126         afterType = true;
1127         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1128             parseContext.extensionsTurnedOn(Num_AEP_texture_buffer, AEP_texture_buffer))
1129             return keyword;
1130         return firstGenerationImage(false);
1131
1132     case IMAGE2D:
1133     case IIMAGE2D:
1134     case UIMAGE2D:
1135     case IMAGE3D:
1136     case IIMAGE3D:
1137     case UIMAGE3D:
1138     case IMAGECUBE:
1139     case IIMAGECUBE:
1140     case UIMAGECUBE:
1141     case IMAGE2DARRAY:
1142     case IIMAGE2DARRAY:
1143     case UIMAGE2DARRAY:
1144         afterType = true;
1145         return firstGenerationImage(true);
1146
1147     case IMAGECUBEARRAY:
1148     case IIMAGECUBEARRAY:
1149     case UIMAGECUBEARRAY:
1150         afterType = true;
1151         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1152             parseContext.extensionsTurnedOn(Num_AEP_texture_cube_map_array, AEP_texture_cube_map_array))
1153             return keyword;
1154         return secondGenerationImage();
1155
1156     case IMAGE2DMS:
1157     case IIMAGE2DMS:
1158     case UIMAGE2DMS:
1159     case IMAGE2DMSARRAY:
1160     case IIMAGE2DMSARRAY:
1161     case UIMAGE2DMSARRAY:
1162         afterType = true;
1163         return secondGenerationImage();
1164
1165     case DOUBLE:
1166     case DVEC2:
1167     case DVEC3:
1168     case DVEC4:
1169         afterType = true;
1170         if (parseContext.isEsProfile() || parseContext.version < 400)
1171             reservedWord();
1172         return keyword;
1173
1174     case INT64_T:
1175     case UINT64_T:
1176     case I64VEC2:
1177     case I64VEC3:
1178     case I64VEC4:
1179     case U64VEC2:
1180     case U64VEC3:
1181     case U64VEC4:
1182         afterType = true;
1183         if (parseContext.symbolTable.atBuiltInLevel() ||
1184             (!parseContext.isEsProfile() && parseContext.version >= 450 &&
1185              (parseContext.extensionTurnedOn(E_GL_ARB_gpu_shader_int64) ||
1186               parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1187               parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int64))))
1188             return keyword;
1189         return identifierOrType();
1190
1191     case INT8_T:
1192     case UINT8_T:
1193     case I8VEC2:
1194     case I8VEC3:
1195     case I8VEC4:
1196     case U8VEC2:
1197     case U8VEC3:
1198     case U8VEC4:
1199         afterType = true;
1200         if (parseContext.symbolTable.atBuiltInLevel() ||
1201             ((parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1202               parseContext.extensionTurnedOn(E_GL_EXT_shader_8bit_storage) ||
1203               parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int8)) &&
1204               !parseContext.isEsProfile() && parseContext.version >= 450))
1205             return keyword;
1206         return identifierOrType();
1207
1208     case INT16_T:
1209     case UINT16_T:
1210     case I16VEC2:
1211     case I16VEC3:
1212     case I16VEC4:
1213     case U16VEC2:
1214     case U16VEC3:
1215     case U16VEC4:
1216         afterType = true;
1217         if (parseContext.symbolTable.atBuiltInLevel() ||
1218             (!parseContext.isEsProfile() && parseContext.version >= 450 &&
1219              (parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_int16) ||
1220               parseContext.extensionTurnedOn(E_GL_EXT_shader_16bit_storage) ||
1221               parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1222               parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int16))))
1223             return keyword;
1224         return identifierOrType();
1225     case INT32_T:
1226     case UINT32_T:
1227     case I32VEC2:
1228     case I32VEC3:
1229     case I32VEC4:
1230     case U32VEC2:
1231     case U32VEC3:
1232     case U32VEC4:
1233         afterType = true;
1234         if (parseContext.symbolTable.atBuiltInLevel() ||
1235            ((parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1236              parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int32)) &&
1237              !parseContext.isEsProfile() && parseContext.version >= 450))
1238             return keyword;
1239         return identifierOrType();
1240     case FLOAT32_T:
1241     case F32VEC2:
1242     case F32VEC3:
1243     case F32VEC4:
1244     case F32MAT2:
1245     case F32MAT3:
1246     case F32MAT4:
1247     case F32MAT2X2:
1248     case F32MAT2X3:
1249     case F32MAT2X4:
1250     case F32MAT3X2:
1251     case F32MAT3X3:
1252     case F32MAT3X4:
1253     case F32MAT4X2:
1254     case F32MAT4X3:
1255     case F32MAT4X4:
1256         afterType = true;
1257         if (parseContext.symbolTable.atBuiltInLevel() ||
1258             ((parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1259               parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float32)) &&
1260               !parseContext.isEsProfile() && parseContext.version >= 450))
1261             return keyword;
1262         return identifierOrType();
1263
1264     case FLOAT64_T:
1265     case F64VEC2:
1266     case F64VEC3:
1267     case F64VEC4:
1268     case F64MAT2:
1269     case F64MAT3:
1270     case F64MAT4:
1271     case F64MAT2X2:
1272     case F64MAT2X3:
1273     case F64MAT2X4:
1274     case F64MAT3X2:
1275     case F64MAT3X3:
1276     case F64MAT3X4:
1277     case F64MAT4X2:
1278     case F64MAT4X3:
1279     case F64MAT4X4:
1280         afterType = true;
1281         if (parseContext.symbolTable.atBuiltInLevel() ||
1282             ((parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1283               parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float64)) &&
1284               !parseContext.isEsProfile() && parseContext.version >= 450))
1285             return keyword;
1286         return identifierOrType();
1287
1288     case FLOAT16_T:
1289     case F16VEC2:
1290     case F16VEC3:
1291     case F16VEC4:
1292         afterType = true;
1293         if (parseContext.symbolTable.atBuiltInLevel() ||
1294             (!parseContext.isEsProfile() && parseContext.version >= 450 &&
1295              (parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_half_float) ||
1296               parseContext.extensionTurnedOn(E_GL_EXT_shader_16bit_storage) ||
1297               parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1298               parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float16))))
1299             return keyword;
1300
1301         return identifierOrType();
1302
1303     case F16MAT2:
1304     case F16MAT3:
1305     case F16MAT4:
1306     case F16MAT2X2:
1307     case F16MAT2X3:
1308     case F16MAT2X4:
1309     case F16MAT3X2:
1310     case F16MAT3X3:
1311     case F16MAT3X4:
1312     case F16MAT4X2:
1313     case F16MAT4X3:
1314     case F16MAT4X4:
1315         afterType = true;
1316         if (parseContext.symbolTable.atBuiltInLevel() ||
1317             (!parseContext.isEsProfile() && parseContext.version >= 450 &&
1318              (parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_half_float) ||
1319               parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1320               parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float16))))
1321             return keyword;
1322
1323         return identifierOrType();
1324 #endif
1325
1326     case SAMPLERCUBEARRAY:
1327     case SAMPLERCUBEARRAYSHADOW:
1328     case ISAMPLERCUBEARRAY:
1329     case USAMPLERCUBEARRAY:
1330         afterType = true;
1331         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1332             parseContext.extensionsTurnedOn(Num_AEP_texture_cube_map_array, AEP_texture_cube_map_array))
1333             return keyword;
1334         if (parseContext.isEsProfile() || (parseContext.version < 400 && ! parseContext.extensionTurnedOn(E_GL_ARB_texture_cube_map_array)))
1335             reservedWord();
1336         return keyword;
1337
1338     case UINT:
1339     case UVEC2:
1340     case UVEC3:
1341     case UVEC4:
1342     case SAMPLERCUBESHADOW:
1343     case SAMPLER2DARRAY:
1344     case SAMPLER2DARRAYSHADOW:
1345     case ISAMPLER2D:
1346     case ISAMPLER3D:
1347     case ISAMPLERCUBE:
1348     case ISAMPLER2DARRAY:
1349     case USAMPLER2D:
1350     case USAMPLER3D:
1351     case USAMPLERCUBE:
1352     case USAMPLER2DARRAY:
1353         afterType = true;
1354         return nonreservedKeyword(300, 130);
1355
1356     case SAMPLER3D:
1357         afterType = true;
1358         if (parseContext.isEsProfile() && parseContext.version < 300) {
1359             if (!parseContext.extensionTurnedOn(E_GL_OES_texture_3D))
1360                 reservedWord();
1361         }
1362         return keyword;
1363
1364     case SAMPLER2DSHADOW:
1365         afterType = true;
1366         if (parseContext.isEsProfile() && parseContext.version < 300) {
1367             if (!parseContext.extensionTurnedOn(E_GL_EXT_shadow_samplers))
1368                 reservedWord();
1369         }
1370         return keyword;
1371
1372 #ifndef GLSLANG_WEB
1373     case ISAMPLER1D:
1374     case ISAMPLER1DARRAY:
1375     case SAMPLER1DARRAYSHADOW:
1376     case USAMPLER1D:
1377     case USAMPLER1DARRAY:
1378         afterType = true;
1379         return es30ReservedFromGLSL(130);
1380     case ISAMPLER2DRECT:
1381     case USAMPLER2DRECT:
1382         afterType = true;
1383         return es30ReservedFromGLSL(140);
1384
1385     case SAMPLERBUFFER:
1386         afterType = true;
1387         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1388             parseContext.extensionsTurnedOn(Num_AEP_texture_buffer, AEP_texture_buffer))
1389             return keyword;
1390         return es30ReservedFromGLSL(130);
1391
1392     case ISAMPLERBUFFER:
1393     case USAMPLERBUFFER:
1394         afterType = true;
1395         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1396             parseContext.extensionsTurnedOn(Num_AEP_texture_buffer, AEP_texture_buffer))
1397             return keyword;
1398         return es30ReservedFromGLSL(140);
1399
1400     case SAMPLER2DMS:
1401     case ISAMPLER2DMS:
1402     case USAMPLER2DMS:
1403         afterType = true;
1404         if (parseContext.isEsProfile() && parseContext.version >= 310)
1405             return keyword;
1406         return es30ReservedFromGLSL(150);
1407
1408     case SAMPLER2DMSARRAY:
1409     case ISAMPLER2DMSARRAY:
1410     case USAMPLER2DMSARRAY:
1411         afterType = true;
1412         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1413             parseContext.extensionsTurnedOn(1, &E_GL_OES_texture_storage_multisample_2d_array))
1414             return keyword;
1415         return es30ReservedFromGLSL(150);
1416
1417     case SAMPLER1D:
1418     case SAMPLER1DSHADOW:
1419         afterType = true;
1420         if (parseContext.isEsProfile())
1421             reservedWord();
1422         return keyword;
1423
1424     case SAMPLER2DRECT:
1425     case SAMPLER2DRECTSHADOW:
1426         afterType = true;
1427         if (parseContext.isEsProfile())
1428             reservedWord();
1429         else if (parseContext.version < 140 && ! parseContext.symbolTable.atBuiltInLevel() && ! parseContext.extensionTurnedOn(E_GL_ARB_texture_rectangle)) {
1430             if (parseContext.relaxedErrors())
1431                 parseContext.requireExtensions(loc, 1, &E_GL_ARB_texture_rectangle, "texture-rectangle sampler keyword");
1432             else
1433                 reservedWord();
1434         }
1435         return keyword;
1436
1437     case SAMPLER1DARRAY:
1438         afterType = true;
1439         if (parseContext.isEsProfile() && parseContext.version == 300)
1440             reservedWord();
1441         else if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1442                  (!parseContext.isEsProfile() && parseContext.version < 130))
1443             return identifierOrType();
1444         return keyword;
1445
1446     case SAMPLEREXTERNALOES:
1447         afterType = true;
1448         if (parseContext.symbolTable.atBuiltInLevel() ||
1449             parseContext.extensionTurnedOn(E_GL_OES_EGL_image_external) ||
1450             parseContext.extensionTurnedOn(E_GL_OES_EGL_image_external_essl3))
1451             return keyword;
1452         return identifierOrType();
1453
1454     case SAMPLEREXTERNAL2DY2YEXT:
1455         afterType = true;
1456         if (parseContext.symbolTable.atBuiltInLevel() ||
1457             parseContext.extensionTurnedOn(E_GL_EXT_YUV_target))
1458             return keyword;
1459         return identifierOrType();
1460
1461     case TEXTURE2D:
1462     case TEXTURECUBE:
1463     case TEXTURECUBEARRAY:
1464     case ITEXTURECUBEARRAY:
1465     case UTEXTURECUBEARRAY:
1466     case ITEXTURE1DARRAY:
1467     case UTEXTURE1D:
1468     case ITEXTURE1D:
1469     case UTEXTURE1DARRAY:
1470     case TEXTUREBUFFER:
1471     case TEXTURE2DARRAY:
1472     case ITEXTURE2D:
1473     case ITEXTURE3D:
1474     case ITEXTURECUBE:
1475     case ITEXTURE2DARRAY:
1476     case UTEXTURE2D:
1477     case UTEXTURE3D:
1478     case UTEXTURECUBE:
1479     case UTEXTURE2DARRAY:
1480     case ITEXTURE2DRECT:
1481     case UTEXTURE2DRECT:
1482     case ITEXTUREBUFFER:
1483     case UTEXTUREBUFFER:
1484     case TEXTURE2DMS:
1485     case ITEXTURE2DMS:
1486     case UTEXTURE2DMS:
1487     case TEXTURE2DMSARRAY:
1488     case ITEXTURE2DMSARRAY:
1489     case UTEXTURE2DMSARRAY:
1490     case TEXTURE1D:
1491     case TEXTURE3D:
1492     case TEXTURE2DRECT:
1493     case TEXTURE1DARRAY:
1494     case SAMPLER:
1495     case SAMPLERSHADOW:
1496         if (parseContext.spvVersion.vulkan > 0)
1497             return keyword;
1498         else
1499             return identifierOrType();
1500
1501     case SUBPASSINPUT:
1502     case SUBPASSINPUTMS:
1503     case ISUBPASSINPUT:
1504     case ISUBPASSINPUTMS:
1505     case USUBPASSINPUT:
1506     case USUBPASSINPUTMS:
1507         if (parseContext.spvVersion.vulkan > 0)
1508             return keyword;
1509         else
1510             return identifierOrType();
1511
1512     case F16SAMPLER1D:
1513     case F16SAMPLER2D:
1514     case F16SAMPLER3D:
1515     case F16SAMPLER2DRECT:
1516     case F16SAMPLERCUBE:
1517     case F16SAMPLER1DARRAY:
1518     case F16SAMPLER2DARRAY:
1519     case F16SAMPLERCUBEARRAY:
1520     case F16SAMPLERBUFFER:
1521     case F16SAMPLER2DMS:
1522     case F16SAMPLER2DMSARRAY:
1523     case F16SAMPLER1DSHADOW:
1524     case F16SAMPLER2DSHADOW:
1525     case F16SAMPLER1DARRAYSHADOW:
1526     case F16SAMPLER2DARRAYSHADOW:
1527     case F16SAMPLER2DRECTSHADOW:
1528     case F16SAMPLERCUBESHADOW:
1529     case F16SAMPLERCUBEARRAYSHADOW:
1530
1531     case F16IMAGE1D:
1532     case F16IMAGE2D:
1533     case F16IMAGE3D:
1534     case F16IMAGE2DRECT:
1535     case F16IMAGECUBE:
1536     case F16IMAGE1DARRAY:
1537     case F16IMAGE2DARRAY:
1538     case F16IMAGECUBEARRAY:
1539     case F16IMAGEBUFFER:
1540     case F16IMAGE2DMS:
1541     case F16IMAGE2DMSARRAY:
1542
1543     case F16TEXTURE1D:
1544     case F16TEXTURE2D:
1545     case F16TEXTURE3D:
1546     case F16TEXTURE2DRECT:
1547     case F16TEXTURECUBE:
1548     case F16TEXTURE1DARRAY:
1549     case F16TEXTURE2DARRAY:
1550     case F16TEXTURECUBEARRAY:
1551     case F16TEXTUREBUFFER:
1552     case F16TEXTURE2DMS:
1553     case F16TEXTURE2DMSARRAY:
1554
1555     case F16SUBPASSINPUT:
1556     case F16SUBPASSINPUTMS:
1557         afterType = true;
1558         if (parseContext.symbolTable.atBuiltInLevel() ||
1559             (parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_half_float_fetch) &&
1560              !parseContext.isEsProfile() && parseContext.version >= 450))
1561             return keyword;
1562         return identifierOrType();
1563
1564     case EXPLICITINTERPAMD:
1565         if (!parseContext.isEsProfile() && parseContext.version >= 450 &&
1566             parseContext.extensionTurnedOn(E_GL_AMD_shader_explicit_vertex_parameter))
1567             return keyword;
1568         return identifierOrType();
1569
1570     case PERVERTEXNV:
1571         if (((!parseContext.isEsProfile() && parseContext.version >= 450) ||
1572             (parseContext.isEsProfile() && parseContext.version >= 320)) &&
1573             parseContext.extensionTurnedOn(E_GL_NV_fragment_shader_barycentric))
1574             return keyword;
1575         return identifierOrType();
1576
1577     case PRECISE:
1578         if ((parseContext.isEsProfile() &&
1579              (parseContext.version >= 320 || parseContext.extensionsTurnedOn(Num_AEP_gpu_shader5, AEP_gpu_shader5))) ||
1580             (!parseContext.isEsProfile() && parseContext.version >= 400))
1581             return keyword;
1582         if (parseContext.isEsProfile() && parseContext.version == 310) {
1583             reservedWord();
1584             return keyword;
1585         }
1586         return identifierOrType();
1587
1588     case PERPRIMITIVENV:
1589     case PERVIEWNV:
1590     case PERTASKNV:
1591         if ((!parseContext.isEsProfile() && parseContext.version >= 450) ||
1592             (parseContext.isEsProfile() && parseContext.version >= 320) ||
1593             parseContext.extensionTurnedOn(E_GL_NV_mesh_shader))
1594             return keyword;
1595         return identifierOrType();
1596
1597     case FCOOPMATNV:
1598         afterType = true;
1599         if (parseContext.symbolTable.atBuiltInLevel() ||
1600             parseContext.extensionTurnedOn(E_GL_NV_cooperative_matrix))
1601             return keyword;
1602         return identifierOrType();
1603
1604     case UCOOPMATNV:
1605     case ICOOPMATNV:
1606         afterType = true;
1607         if (parseContext.symbolTable.atBuiltInLevel() ||
1608             parseContext.extensionTurnedOn(E_GL_NV_integer_cooperative_matrix))
1609             return keyword;
1610         return identifierOrType();
1611
1612     case DEMOTE:
1613         if (parseContext.extensionTurnedOn(E_GL_EXT_demote_to_helper_invocation))
1614             return keyword;
1615         else
1616             return identifierOrType();
1617 #endif
1618
1619     default:
1620         parseContext.infoSink.info.message(EPrefixInternalError, "Unknown glslang keyword", loc);
1621         return 0;
1622     }
1623 }
1624
1625 int TScanContext::identifierOrType()
1626 {
1627     parserToken->sType.lex.string = NewPoolTString(tokenText);
1628     if (field)
1629         return IDENTIFIER;
1630
1631     parserToken->sType.lex.symbol = parseContext.symbolTable.find(*parserToken->sType.lex.string);
1632     if ((afterType == false && afterStruct == false) && parserToken->sType.lex.symbol != nullptr) {
1633         if (const TVariable* variable = parserToken->sType.lex.symbol->getAsVariable()) {
1634             if (variable->isUserType() &&
1635                 // treat redeclaration of forward-declared buffer/uniform reference as an identifier
1636                 !(variable->getType().isReference() && afterBuffer)) {
1637                 afterType = true;
1638
1639                 return TYPE_NAME;
1640             }
1641         }
1642     }
1643
1644     return IDENTIFIER;
1645 }
1646
1647 // Give an error for use of a reserved symbol.
1648 // However, allow built-in declarations to use reserved words, to allow
1649 // extension support before the extension is enabled.
1650 int TScanContext::reservedWord()
1651 {
1652     if (! parseContext.symbolTable.atBuiltInLevel())
1653         parseContext.error(loc, "Reserved word.", tokenText, "", "");
1654
1655     return 0;
1656 }
1657
1658 int TScanContext::identifierOrReserved(bool reserved)
1659 {
1660     if (reserved) {
1661         reservedWord();
1662
1663         return 0;
1664     }
1665
1666     if (parseContext.isForwardCompatible())
1667         parseContext.warn(loc, "using future reserved keyword", tokenText, "");
1668
1669     return identifierOrType();
1670 }
1671
1672 // For keywords that suddenly showed up on non-ES (not previously reserved)
1673 // but then got reserved by ES 3.0.
1674 int TScanContext::es30ReservedFromGLSL(int version)
1675 {
1676     if (parseContext.symbolTable.atBuiltInLevel())
1677         return keyword;
1678
1679     if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1680         (!parseContext.isEsProfile() && parseContext.version < version)) {
1681             if (parseContext.isForwardCompatible())
1682                 parseContext.warn(loc, "future reserved word in ES 300 and keyword in GLSL", tokenText, "");
1683
1684             return identifierOrType();
1685     } else if (parseContext.isEsProfile() && parseContext.version >= 300)
1686         reservedWord();
1687
1688     return keyword;
1689 }
1690
1691 // For a keyword that was never reserved, until it suddenly
1692 // showed up, both in an es version and a non-ES version.
1693 int TScanContext::nonreservedKeyword(int esVersion, int nonEsVersion)
1694 {
1695     if ((parseContext.isEsProfile() && parseContext.version < esVersion) ||
1696         (!parseContext.isEsProfile() && parseContext.version < nonEsVersion)) {
1697         if (parseContext.isForwardCompatible())
1698             parseContext.warn(loc, "using future keyword", tokenText, "");
1699
1700         return identifierOrType();
1701     }
1702
1703     return keyword;
1704 }
1705
1706 int TScanContext::precisionKeyword()
1707 {
1708     if (parseContext.isEsProfile() || parseContext.version >= 130)
1709         return keyword;
1710
1711     if (parseContext.isForwardCompatible())
1712         parseContext.warn(loc, "using ES precision qualifier keyword", tokenText, "");
1713
1714     return identifierOrType();
1715 }
1716
1717 int TScanContext::matNxM()
1718 {
1719     afterType = true;
1720
1721     if (parseContext.version > 110)
1722         return keyword;
1723
1724     if (parseContext.isForwardCompatible())
1725         parseContext.warn(loc, "using future non-square matrix type keyword", tokenText, "");
1726
1727     return identifierOrType();
1728 }
1729
1730 int TScanContext::dMat()
1731 {
1732     afterType = true;
1733
1734     if (parseContext.isEsProfile() && parseContext.version >= 300) {
1735         reservedWord();
1736
1737         return keyword;
1738     }
1739
1740     if (!parseContext.isEsProfile() && parseContext.version >= 400)
1741         return keyword;
1742
1743     if (parseContext.isForwardCompatible())
1744         parseContext.warn(loc, "using future type keyword", tokenText, "");
1745
1746     return identifierOrType();
1747 }
1748
1749 int TScanContext::firstGenerationImage(bool inEs310)
1750 {
1751     if (parseContext.symbolTable.atBuiltInLevel() ||
1752         (!parseContext.isEsProfile() && (parseContext.version >= 420 ||
1753          parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store))) ||
1754         (inEs310 && parseContext.isEsProfile() && parseContext.version >= 310))
1755         return keyword;
1756
1757     if ((parseContext.isEsProfile() && parseContext.version >= 300) ||
1758         (!parseContext.isEsProfile() && parseContext.version >= 130)) {
1759         reservedWord();
1760
1761         return keyword;
1762     }
1763
1764     if (parseContext.isForwardCompatible())
1765         parseContext.warn(loc, "using future type keyword", tokenText, "");
1766
1767     return identifierOrType();
1768 }
1769
1770 int TScanContext::secondGenerationImage()
1771 {
1772     if (parseContext.isEsProfile() && parseContext.version >= 310) {
1773         reservedWord();
1774         return keyword;
1775     }
1776
1777     if (parseContext.symbolTable.atBuiltInLevel() ||
1778         (!parseContext.isEsProfile() &&
1779          (parseContext.version >= 420 || parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store))))
1780         return keyword;
1781
1782     if (parseContext.isForwardCompatible())
1783         parseContext.warn(loc, "using future type keyword", tokenText, "");
1784
1785     return identifierOrType();
1786 }
1787
1788 } // end namespace glslang