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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  24 //    from this software without specific prior written permission.
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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)["return"] =                  RETURN;
 369     (*KeywordMap)["void"] =                    VOID;
 370     (*KeywordMap)["bool"] =                    BOOL;
 371     (*KeywordMap)["float"] =                   FLOAT;
 372     (*KeywordMap)["int"] =                     INT;
 373     (*KeywordMap)["bvec2"] =                   BVEC2;
 374     (*KeywordMap)["bvec3"] =                   BVEC3;
 375     (*KeywordMap)["bvec4"] =                   BVEC4;
 376     (*KeywordMap)["vec2"] =                    VEC2;
 377     (*KeywordMap)["vec3"] =                    VEC3;
 378     (*KeywordMap)["vec4"] =                    VEC4;
 379     (*KeywordMap)["ivec2"] =                   IVEC2;
 380     (*KeywordMap)["ivec3"] =                   IVEC3;
 381     (*KeywordMap)["ivec4"] =                   IVEC4;
 382     (*KeywordMap)["mat2"] =                    MAT2;
 383     (*KeywordMap)["mat3"] =                    MAT3;
 384     (*KeywordMap)["mat4"] =                    MAT4;
 385     (*KeywordMap)["true"] =                    BOOLCONSTANT;
 386     (*KeywordMap)["false"] =                   BOOLCONSTANT;
 387     (*KeywordMap)["layout"] =                  LAYOUT;
 388     (*KeywordMap)["shared"] =                  SHARED;
 389     (*KeywordMap)["highp"] =                   HIGH_PRECISION;
 390     (*KeywordMap)["mediump"] =                 MEDIUM_PRECISION;
 391     (*KeywordMap)["lowp"] =                    LOW_PRECISION;
 392     (*KeywordMap)["superp"] =                  SUPERP;
 393     (*KeywordMap)["precision"] =               PRECISION;
 394     (*KeywordMap)["mat2x2"] =                  MAT2X2;
 395     (*KeywordMap)["mat2x3"] =                  MAT2X3;
 396     (*KeywordMap)["mat2x4"] =                  MAT2X4;
 397     (*KeywordMap)["mat3x2"] =                  MAT3X2;
 398     (*KeywordMap)["mat3x3"] =                  MAT3X3;
 399     (*KeywordMap)["mat3x4"] =                  MAT3X4;
 400     (*KeywordMap)["mat4x2"] =                  MAT4X2;
 401     (*KeywordMap)["mat4x3"] =                  MAT4X3;
 402     (*KeywordMap)["mat4x4"] =                  MAT4X4;
 403     (*KeywordMap)["uint"] =                    UINT;
 404     (*KeywordMap)["uvec2"] =                   UVEC2;
 405     (*KeywordMap)["uvec3"] =                   UVEC3;
 406     (*KeywordMap)["uvec4"] =                   UVEC4;
 407
 408 #ifndef GLSLANG_WEB
 409     (*KeywordMap)["nonuniformEXT"] =           NONUNIFORM;
 410     (*KeywordMap)["demote"] =                  DEMOTE;
 411     (*KeywordMap)["attribute"] =               ATTRIBUTE;
 412     (*KeywordMap)["varying"] =                 VARYING;
 413     (*KeywordMap)["noperspective"] =           NOPERSPECTIVE;
 414     (*KeywordMap)["coherent"] =                COHERENT;
 415     (*KeywordMap)["devicecoherent"] =          DEVICECOHERENT;
 416     (*KeywordMap)["queuefamilycoherent"] =     QUEUEFAMILYCOHERENT;
 417     (*KeywordMap)["workgroupcoherent"] =       WORKGROUPCOHERENT;
 418     (*KeywordMap)["subgroupcoherent"] =        SUBGROUPCOHERENT;
 419     (*KeywordMap)["shadercallcoherent"] =      SHADERCALLCOHERENT;
 420     (*KeywordMap)["nonprivate"] =              NONPRIVATE;
 421     (*KeywordMap)["restrict"] =                RESTRICT;
 422     (*KeywordMap)["readonly"] =                READONLY;
 423     (*KeywordMap)["writeonly"] =               WRITEONLY;
 424     (*KeywordMap)["atomic_uint"] =             ATOMIC_UINT;
 425     (*KeywordMap)["volatile"] =                VOLATILE;
 426     (*KeywordMap)["patch"] =                   PATCH;
 427     (*KeywordMap)["sample"] =                  SAMPLE;
 428     (*KeywordMap)["subroutine"] =              SUBROUTINE;
 429     (*KeywordMap)["dmat2"] =                   DMAT2;
 430     (*KeywordMap)["dmat3"] =                   DMAT3;
 431     (*KeywordMap)["dmat4"] =                   DMAT4;
 432     (*KeywordMap)["dmat2x2"] =                 DMAT2X2;
 433     (*KeywordMap)["dmat2x3"] =                 DMAT2X3;
 434     (*KeywordMap)["dmat2x4"] =                 DMAT2X4;
 435     (*KeywordMap)["dmat3x2"] =                 DMAT3X2;
 436     (*KeywordMap)["dmat3x3"] =                 DMAT3X3;
 437     (*KeywordMap)["dmat3x4"] =                 DMAT3X4;
 438     (*KeywordMap)["dmat4x2"] =                 DMAT4X2;
 439     (*KeywordMap)["dmat4x3"] =                 DMAT4X3;
 440     (*KeywordMap)["dmat4x4"] =                 DMAT4X4;
 441     (*KeywordMap)["image1D"] =                 IMAGE1D;
 442     (*KeywordMap)["iimage1D"] =                IIMAGE1D;
 443     (*KeywordMap)["uimage1D"] =                UIMAGE1D;
 444     (*KeywordMap)["image2D"] =                 IMAGE2D;
 445     (*KeywordMap)["iimage2D"] =                IIMAGE2D;
 446     (*KeywordMap)["uimage2D"] =                UIMAGE2D;
 447     (*KeywordMap)["image3D"] =                 IMAGE3D;
 448     (*KeywordMap)["iimage3D"] =                IIMAGE3D;
 449     (*KeywordMap)["uimage3D"] =                UIMAGE3D;
 450     (*KeywordMap)["image2DRect"] =             IMAGE2DRECT;
 451     (*KeywordMap)["iimage2DRect"] =            IIMAGE2DRECT;
 452     (*KeywordMap)["uimage2DRect"] =            UIMAGE2DRECT;
 453     (*KeywordMap)["imageCube"] =               IMAGECUBE;
 454     (*KeywordMap)["iimageCube"] =              IIMAGECUBE;
 455     (*KeywordMap)["uimageCube"] =              UIMAGECUBE;
 456     (*KeywordMap)["imageBuffer"] =             IMAGEBUFFER;
 457     (*KeywordMap)["iimageBuffer"] =            IIMAGEBUFFER;
 458     (*KeywordMap)["uimageBuffer"] =            UIMAGEBUFFER;
 459     (*KeywordMap)["image1DArray"] =            IMAGE1DARRAY;
 460     (*KeywordMap)["iimage1DArray"] =           IIMAGE1DARRAY;
 461     (*KeywordMap)["uimage1DArray"] =           UIMAGE1DARRAY;
 462     (*KeywordMap)["image2DArray"] =            IMAGE2DARRAY;
 463     (*KeywordMap)["iimage2DArray"] =           IIMAGE2DARRAY;
 464     (*KeywordMap)["uimage2DArray"] =           UIMAGE2DARRAY;
 465     (*KeywordMap)["imageCubeArray"] =          IMAGECUBEARRAY;
 466     (*KeywordMap)["iimageCubeArray"] =         IIMAGECUBEARRAY;
 467     (*KeywordMap)["uimageCubeArray"] =         UIMAGECUBEARRAY;
 468     (*KeywordMap)["image2DMS"] =               IMAGE2DMS;
 469     (*KeywordMap)["iimage2DMS"] =              IIMAGE2DMS;
 470     (*KeywordMap)["uimage2DMS"] =              UIMAGE2DMS;
 471     (*KeywordMap)["image2DMSArray"] =          IMAGE2DMSARRAY;
 472     (*KeywordMap)["iimage2DMSArray"] =         IIMAGE2DMSARRAY;
 473     (*KeywordMap)["uimage2DMSArray"] =         UIMAGE2DMSARRAY;
 474     (*KeywordMap)["double"] =                  DOUBLE;
 475     (*KeywordMap)["dvec2"] =                   DVEC2;
 476     (*KeywordMap)["dvec3"] =                   DVEC3;
 477     (*KeywordMap)["dvec4"] =                   DVEC4;
 478     (*KeywordMap)["int64_t"] =                 INT64_T;
 479     (*KeywordMap)["uint64_t"] =                UINT64_T;
 480     (*KeywordMap)["i64vec2"] =                 I64VEC2;
 481     (*KeywordMap)["i64vec3"] =                 I64VEC3;
 482     (*KeywordMap)["i64vec4"] =                 I64VEC4;
 483     (*KeywordMap)["u64vec2"] =                 U64VEC2;
 484     (*KeywordMap)["u64vec3"] =                 U64VEC3;
 485     (*KeywordMap)["u64vec4"] =                 U64VEC4;
 486
 487     // GL_EXT_shader_explicit_arithmetic_types
 488     (*KeywordMap)["int8_t"] =                  INT8_T;
 489     (*KeywordMap)["i8vec2"] =                  I8VEC2;
 490     (*KeywordMap)["i8vec3"] =                  I8VEC3;
 491     (*KeywordMap)["i8vec4"] =                  I8VEC4;
 492     (*KeywordMap)["uint8_t"] =                 UINT8_T;
 493     (*KeywordMap)["u8vec2"] =                  U8VEC2;
 494     (*KeywordMap)["u8vec3"] =                  U8VEC3;
 495     (*KeywordMap)["u8vec4"] =                  U8VEC4;
 496
 497     (*KeywordMap)["int16_t"] =                 INT16_T;
 498     (*KeywordMap)["i16vec2"] =                 I16VEC2;
 499     (*KeywordMap)["i16vec3"] =                 I16VEC3;
 500     (*KeywordMap)["i16vec4"] =                 I16VEC4;
 501     (*KeywordMap)["uint16_t"] =                UINT16_T;
 502     (*KeywordMap)["u16vec2"] =                 U16VEC2;
 503     (*KeywordMap)["u16vec3"] =                 U16VEC3;
 504     (*KeywordMap)["u16vec4"] =                 U16VEC4;
 505
 506     (*KeywordMap)["int32_t"] =                 INT32_T;
 507     (*KeywordMap)["i32vec2"] =                 I32VEC2;
 508     (*KeywordMap)["i32vec3"] =                 I32VEC3;
 509     (*KeywordMap)["i32vec4"] =                 I32VEC4;
 510     (*KeywordMap)["uint32_t"] =                UINT32_T;
 511     (*KeywordMap)["u32vec2"] =                 U32VEC2;
 512     (*KeywordMap)["u32vec3"] =                 U32VEC3;
 513     (*KeywordMap)["u32vec4"] =                 U32VEC4;
 514
 515     (*KeywordMap)["float16_t"] =               FLOAT16_T;
 516     (*KeywordMap)["f16vec2"] =                 F16VEC2;
 517     (*KeywordMap)["f16vec3"] =                 F16VEC3;
 518     (*KeywordMap)["f16vec4"] =                 F16VEC4;
 519     (*KeywordMap)["f16mat2"] =                 F16MAT2;
 520     (*KeywordMap)["f16mat3"] =                 F16MAT3;
 521     (*KeywordMap)["f16mat4"] =                 F16MAT4;
 522     (*KeywordMap)["f16mat2x2"] =               F16MAT2X2;
 523     (*KeywordMap)["f16mat2x3"] =               F16MAT2X3;
 524     (*KeywordMap)["f16mat2x4"] =               F16MAT2X4;
 525     (*KeywordMap)["f16mat3x2"] =               F16MAT3X2;
 526     (*KeywordMap)["f16mat3x3"] =               F16MAT3X3;
 527     (*KeywordMap)["f16mat3x4"] =               F16MAT3X4;
 528     (*KeywordMap)["f16mat4x2"] =               F16MAT4X2;
 529     (*KeywordMap)["f16mat4x3"] =               F16MAT4X3;
 530     (*KeywordMap)["f16mat4x4"] =               F16MAT4X4;
 531
 532     (*KeywordMap)["float32_t"] =               FLOAT32_T;
 533     (*KeywordMap)["f32vec2"] =                 F32VEC2;
 534     (*KeywordMap)["f32vec3"] =                 F32VEC3;
 535     (*KeywordMap)["f32vec4"] =                 F32VEC4;
 536     (*KeywordMap)["f32mat2"] =                 F32MAT2;
 537     (*KeywordMap)["f32mat3"] =                 F32MAT3;
 538     (*KeywordMap)["f32mat4"] =                 F32MAT4;
 539     (*KeywordMap)["f32mat2x2"] =               F32MAT2X2;
 540     (*KeywordMap)["f32mat2x3"] =               F32MAT2X3;
 541     (*KeywordMap)["f32mat2x4"] =               F32MAT2X4;
 542     (*KeywordMap)["f32mat3x2"] =               F32MAT3X2;
 543     (*KeywordMap)["f32mat3x3"] =               F32MAT3X3;
 544     (*KeywordMap)["f32mat3x4"] =               F32MAT3X4;
 545     (*KeywordMap)["f32mat4x2"] =               F32MAT4X2;
 546     (*KeywordMap)["f32mat4x3"] =               F32MAT4X3;
 547     (*KeywordMap)["f32mat4x4"] =               F32MAT4X4;
 548     (*KeywordMap)["float64_t"] =               FLOAT64_T;
 549     (*KeywordMap)["f64vec2"] =                 F64VEC2;
 550     (*KeywordMap)["f64vec3"] =                 F64VEC3;
 551     (*KeywordMap)["f64vec4"] =                 F64VEC4;
 552     (*KeywordMap)["f64mat2"] =                 F64MAT2;
 553     (*KeywordMap)["f64mat3"] =                 F64MAT3;
 554     (*KeywordMap)["f64mat4"] =                 F64MAT4;
 555     (*KeywordMap)["f64mat2x2"] =               F64MAT2X2;
 556     (*KeywordMap)["f64mat2x3"] =               F64MAT2X3;
 557     (*KeywordMap)["f64mat2x4"] =               F64MAT2X4;
 558     (*KeywordMap)["f64mat3x2"] =               F64MAT3X2;
 559     (*KeywordMap)["f64mat3x3"] =               F64MAT3X3;
 560     (*KeywordMap)["f64mat3x4"] =               F64MAT3X4;
 561     (*KeywordMap)["f64mat4x2"] =               F64MAT4X2;
 562     (*KeywordMap)["f64mat4x3"] =               F64MAT4X3;
 563     (*KeywordMap)["f64mat4x4"] =               F64MAT4X4;
 564 #endif
 565
 566     (*KeywordMap)["sampler2D"] =               SAMPLER2D;
 567     (*KeywordMap)["samplerCube"] =             SAMPLERCUBE;
 568     (*KeywordMap)["samplerCubeShadow"] =       SAMPLERCUBESHADOW;
 569     (*KeywordMap)["sampler2DArray"] =          SAMPLER2DARRAY;
 570     (*KeywordMap)["sampler2DArrayShadow"] =    SAMPLER2DARRAYSHADOW;
 571     (*KeywordMap)["isampler2D"] =              ISAMPLER2D;
 572     (*KeywordMap)["isampler3D"] =              ISAMPLER3D;
 573     (*KeywordMap)["isamplerCube"] =            ISAMPLERCUBE;
 574     (*KeywordMap)["isampler2DArray"] =         ISAMPLER2DARRAY;
 575     (*KeywordMap)["usampler2D"] =              USAMPLER2D;
 576     (*KeywordMap)["usampler3D"] =              USAMPLER3D;
 577     (*KeywordMap)["usamplerCube"] =            USAMPLERCUBE;
 578     (*KeywordMap)["usampler2DArray"] =         USAMPLER2DARRAY;
 579     (*KeywordMap)["sampler3D"] =               SAMPLER3D;
 580     (*KeywordMap)["sampler2DShadow"] =         SAMPLER2DSHADOW;
 581
 582     (*KeywordMap)["texture2D"] =               TEXTURE2D;
 583     (*KeywordMap)["textureCube"] =             TEXTURECUBE;
 584     (*KeywordMap)["texture2DArray"] =          TEXTURE2DARRAY;
 585     (*KeywordMap)["itexture2D"] =              ITEXTURE2D;
 586     (*KeywordMap)["itexture3D"] =              ITEXTURE3D;
 587     (*KeywordMap)["itextureCube"] =            ITEXTURECUBE;
 588     (*KeywordMap)["itexture2DArray"] =         ITEXTURE2DARRAY;
 589     (*KeywordMap)["utexture2D"] =              UTEXTURE2D;
 590     (*KeywordMap)["utexture3D"] =              UTEXTURE3D;
 591     (*KeywordMap)["utextureCube"] =            UTEXTURECUBE;
 592     (*KeywordMap)["utexture2DArray"] =         UTEXTURE2DARRAY;
 593     (*KeywordMap)["texture3D"] =               TEXTURE3D;
 594
 595     (*KeywordMap)["sampler"] =                 SAMPLER;
 596     (*KeywordMap)["samplerShadow"] =           SAMPLERSHADOW;
 597
 598 #ifndef GLSLANG_WEB
 599     (*KeywordMap)["textureCubeArray"] =        TEXTURECUBEARRAY;
 600     (*KeywordMap)["itextureCubeArray"] =       ITEXTURECUBEARRAY;
 601     (*KeywordMap)["utextureCubeArray"] =       UTEXTURECUBEARRAY;
 602     (*KeywordMap)["samplerCubeArray"] =        SAMPLERCUBEARRAY;
 603     (*KeywordMap)["samplerCubeArrayShadow"] =  SAMPLERCUBEARRAYSHADOW;
 604     (*KeywordMap)["isamplerCubeArray"] =       ISAMPLERCUBEARRAY;
 605     (*KeywordMap)["usamplerCubeArray"] =       USAMPLERCUBEARRAY;
 606     (*KeywordMap)["sampler1DArrayShadow"] =    SAMPLER1DARRAYSHADOW;
 607     (*KeywordMap)["isampler1DArray"] =         ISAMPLER1DARRAY;
 608     (*KeywordMap)["usampler1D"] =              USAMPLER1D;
 609     (*KeywordMap)["isampler1D"] =              ISAMPLER1D;
 610     (*KeywordMap)["usampler1DArray"] =         USAMPLER1DARRAY;
 611     (*KeywordMap)["samplerBuffer"] =           SAMPLERBUFFER;
 612     (*KeywordMap)["isampler2DRect"] =          ISAMPLER2DRECT;
 613     (*KeywordMap)["usampler2DRect"] =          USAMPLER2DRECT;
 614     (*KeywordMap)["isamplerBuffer"] =          ISAMPLERBUFFER;
 615     (*KeywordMap)["usamplerBuffer"] =          USAMPLERBUFFER;
 616     (*KeywordMap)["sampler2DMS"] =             SAMPLER2DMS;
 617     (*KeywordMap)["isampler2DMS"] =            ISAMPLER2DMS;
 618     (*KeywordMap)["usampler2DMS"] =            USAMPLER2DMS;
 619     (*KeywordMap)["sampler2DMSArray"] =        SAMPLER2DMSARRAY;
 620     (*KeywordMap)["isampler2DMSArray"] =       ISAMPLER2DMSARRAY;
 621     (*KeywordMap)["usampler2DMSArray"] =       USAMPLER2DMSARRAY;
 622     (*KeywordMap)["sampler1D"] =               SAMPLER1D;
 623     (*KeywordMap)["sampler1DShadow"] =         SAMPLER1DSHADOW;
 624     (*KeywordMap)["sampler2DRect"] =           SAMPLER2DRECT;
 625     (*KeywordMap)["sampler2DRectShadow"] =     SAMPLER2DRECTSHADOW;
 626     (*KeywordMap)["sampler1DArray"] =          SAMPLER1DARRAY;
 627
 628     (*KeywordMap)["samplerExternalOES"] =      SAMPLEREXTERNALOES; // GL_OES_EGL_image_external
 629
 630     (*KeywordMap)["__samplerExternal2DY2YEXT"] = SAMPLEREXTERNAL2DY2YEXT; // GL_EXT_YUV_target
 631
 632     (*KeywordMap)["itexture1DArray"] =         ITEXTURE1DARRAY;
 633     (*KeywordMap)["utexture1D"] =              UTEXTURE1D;
 634     (*KeywordMap)["itexture1D"] =              ITEXTURE1D;
 635     (*KeywordMap)["utexture1DArray"] =         UTEXTURE1DARRAY;
 636     (*KeywordMap)["textureBuffer"] =           TEXTUREBUFFER;
 637     (*KeywordMap)["itexture2DRect"] =          ITEXTURE2DRECT;
 638     (*KeywordMap)["utexture2DRect"] =          UTEXTURE2DRECT;
 639     (*KeywordMap)["itextureBuffer"] =          ITEXTUREBUFFER;
 640     (*KeywordMap)["utextureBuffer"] =          UTEXTUREBUFFER;
 641     (*KeywordMap)["texture2DMS"] =             TEXTURE2DMS;
 642     (*KeywordMap)["itexture2DMS"] =            ITEXTURE2DMS;
 643     (*KeywordMap)["utexture2DMS"] =            UTEXTURE2DMS;
 644     (*KeywordMap)["texture2DMSArray"] =        TEXTURE2DMSARRAY;
 645     (*KeywordMap)["itexture2DMSArray"] =       ITEXTURE2DMSARRAY;
 646     (*KeywordMap)["utexture2DMSArray"] =       UTEXTURE2DMSARRAY;
 647     (*KeywordMap)["texture1D"] =               TEXTURE1D;
 648     (*KeywordMap)["texture2DRect"] =           TEXTURE2DRECT;
 649     (*KeywordMap)["texture1DArray"] =          TEXTURE1DARRAY;
 650
 651     (*KeywordMap)["subpassInput"] =            SUBPASSINPUT;
 652     (*KeywordMap)["subpassInputMS"] =          SUBPASSINPUTMS;
 653     (*KeywordMap)["isubpassInput"] =           ISUBPASSINPUT;
 654     (*KeywordMap)["isubpassInputMS"] =         ISUBPASSINPUTMS;
 655     (*KeywordMap)["usubpassInput"] =           USUBPASSINPUT;
 656     (*KeywordMap)["usubpassInputMS"] =         USUBPASSINPUTMS;
 657
 658     (*KeywordMap)["f16sampler1D"] =                 F16SAMPLER1D;
 659     (*KeywordMap)["f16sampler2D"] =                 F16SAMPLER2D;
 660     (*KeywordMap)["f16sampler3D"] =                 F16SAMPLER3D;
 661     (*KeywordMap)["f16sampler2DRect"] =             F16SAMPLER2DRECT;
 662     (*KeywordMap)["f16samplerCube"] =               F16SAMPLERCUBE;
 663     (*KeywordMap)["f16sampler1DArray"] =            F16SAMPLER1DARRAY;
 664     (*KeywordMap)["f16sampler2DArray"] =            F16SAMPLER2DARRAY;
 665     (*KeywordMap)["f16samplerCubeArray"] =          F16SAMPLERCUBEARRAY;
 666     (*KeywordMap)["f16samplerBuffer"] =             F16SAMPLERBUFFER;
 667     (*KeywordMap)["f16sampler2DMS"] =               F16SAMPLER2DMS;
 668     (*KeywordMap)["f16sampler2DMSArray"] =          F16SAMPLER2DMSARRAY;
 669     (*KeywordMap)["f16sampler1DShadow"] =           F16SAMPLER1DSHADOW;
 670     (*KeywordMap)["f16sampler2DShadow"] =           F16SAMPLER2DSHADOW;
 671     (*KeywordMap)["f16sampler2DRectShadow"] =       F16SAMPLER2DRECTSHADOW;
 672     (*KeywordMap)["f16samplerCubeShadow"] =         F16SAMPLERCUBESHADOW;
 673     (*KeywordMap)["f16sampler1DArrayShadow"] =      F16SAMPLER1DARRAYSHADOW;
 674     (*KeywordMap)["f16sampler2DArrayShadow"] =      F16SAMPLER2DARRAYSHADOW;
 675     (*KeywordMap)["f16samplerCubeArrayShadow"] =    F16SAMPLERCUBEARRAYSHADOW;
 676
 677     (*KeywordMap)["f16image1D"] =                   F16IMAGE1D;
 678     (*KeywordMap)["f16image2D"] =                   F16IMAGE2D;
 679     (*KeywordMap)["f16image3D"] =                   F16IMAGE3D;
 680     (*KeywordMap)["f16image2DRect"] =               F16IMAGE2DRECT;
 681     (*KeywordMap)["f16imageCube"] =                 F16IMAGECUBE;
 682     (*KeywordMap)["f16image1DArray"] =              F16IMAGE1DARRAY;
 683     (*KeywordMap)["f16image2DArray"] =              F16IMAGE2DARRAY;
 684     (*KeywordMap)["f16imageCubeArray"] =            F16IMAGECUBEARRAY;
 685     (*KeywordMap)["f16imageBuffer"] =               F16IMAGEBUFFER;
 686     (*KeywordMap)["f16image2DMS"] =                 F16IMAGE2DMS;
 687     (*KeywordMap)["f16image2DMSArray"] =            F16IMAGE2DMSARRAY;
 688
 689     (*KeywordMap)["f16texture1D"] =                 F16TEXTURE1D;
 690     (*KeywordMap)["f16texture2D"] =                 F16TEXTURE2D;
 691     (*KeywordMap)["f16texture3D"] =                 F16TEXTURE3D;
 692     (*KeywordMap)["f16texture2DRect"] =             F16TEXTURE2DRECT;
 693     (*KeywordMap)["f16textureCube"] =               F16TEXTURECUBE;
 694     (*KeywordMap)["f16texture1DArray"] =            F16TEXTURE1DARRAY;
 695     (*KeywordMap)["f16texture2DArray"] =            F16TEXTURE2DARRAY;
 696     (*KeywordMap)["f16textureCubeArray"] =          F16TEXTURECUBEARRAY;
 697     (*KeywordMap)["f16textureBuffer"] =             F16TEXTUREBUFFER;
 698     (*KeywordMap)["f16texture2DMS"] =               F16TEXTURE2DMS;
 699     (*KeywordMap)["f16texture2DMSArray"] =          F16TEXTURE2DMSARRAY;
 700
 701     (*KeywordMap)["f16subpassInput"] =              F16SUBPASSINPUT;
 702     (*KeywordMap)["f16subpassInputMS"] =            F16SUBPASSINPUTMS;
 703     (*KeywordMap)["__explicitInterpAMD"] =     EXPLICITINTERPAMD;
 704     (*KeywordMap)["pervertexNV"] =             PERVERTEXNV;
 705     (*KeywordMap)["precise"] =                 PRECISE;
 706
 707     (*KeywordMap)["rayPayloadNV"] =            PAYLOADNV;
 708     (*KeywordMap)["rayPayloadEXT"] =           PAYLOADEXT;
 709     (*KeywordMap)["rayPayloadInNV"] =          PAYLOADINNV;
 710     (*KeywordMap)["rayPayloadInEXT"] =         PAYLOADINEXT;
 711     (*KeywordMap)["hitAttributeNV"] =          HITATTRNV;
 712     (*KeywordMap)["hitAttributeEXT"] =         HITATTREXT;
 713     (*KeywordMap)["callableDataNV"] =          CALLDATANV;
 714     (*KeywordMap)["callableDataEXT"] =         CALLDATAEXT;
 715     (*KeywordMap)["callableDataInNV"] =        CALLDATAINNV;
 716     (*KeywordMap)["callableDataInEXT"] =       CALLDATAINEXT;
 717     (*KeywordMap)["accelerationStructureNV"] = ACCSTRUCTNV;
 718     (*KeywordMap)["accelerationStructureEXT"]   = ACCSTRUCTEXT;
 719     (*KeywordMap)["rayQueryEXT"] =              RAYQUERYEXT;
 720     (*KeywordMap)["perprimitiveNV"] =          PERPRIMITIVENV;
 721     (*KeywordMap)["perviewNV"] =               PERVIEWNV;
 722     (*KeywordMap)["taskNV"] =                  PERTASKNV;
 723
 724     (*KeywordMap)["fcoopmatNV"] =              FCOOPMATNV;
 725     (*KeywordMap)["icoopmatNV"] =              ICOOPMATNV;
 726     (*KeywordMap)["ucoopmatNV"] =              UCOOPMATNV;
 727
 728     ReservedSet = new std::unordered_set<const char*, str_hash, str_eq>;
 729
 730     ReservedSet->insert("common");
 731     ReservedSet->insert("partition");
 732     ReservedSet->insert("active");
 733     ReservedSet->insert("asm");
 734     ReservedSet->insert("class");
 735     ReservedSet->insert("union");
 736     ReservedSet->insert("enum");
 737     ReservedSet->insert("typedef");
 738     ReservedSet->insert("template");
 739     ReservedSet->insert("this");
 740     ReservedSet->insert("goto");
 741     ReservedSet->insert("inline");
 742     ReservedSet->insert("noinline");
 743     ReservedSet->insert("public");
 744     ReservedSet->insert("static");
 745     ReservedSet->insert("extern");
 746     ReservedSet->insert("external");
 747     ReservedSet->insert("interface");
 748     ReservedSet->insert("long");
 749     ReservedSet->insert("short");
 750     ReservedSet->insert("half");
 751     ReservedSet->insert("fixed");
 752     ReservedSet->insert("unsigned");
 753     ReservedSet->insert("input");
 754     ReservedSet->insert("output");
 755     ReservedSet->insert("hvec2");
 756     ReservedSet->insert("hvec3");
 757     ReservedSet->insert("hvec4");
 758     ReservedSet->insert("fvec2");
 759     ReservedSet->insert("fvec3");
 760     ReservedSet->insert("fvec4");
 761     ReservedSet->insert("sampler3DRect");
 762     ReservedSet->insert("filter");
 763     ReservedSet->insert("sizeof");
 764     ReservedSet->insert("cast");
 765     ReservedSet->insert("namespace");
 766     ReservedSet->insert("using");
 767 #endif
 768 }
 769
 770 void TScanContext::deleteKeywordMap()
 771 {
 772     delete KeywordMap;
 773     KeywordMap = nullptr;
 774 #ifndef GLSLANG_WEB
 775     delete ReservedSet;
 776     ReservedSet = nullptr;
 777 #endif
 778 }
 779
 780 // Called by yylex to get the next token.
 781 // Returning 0 implies end of input.
 782 int TScanContext::tokenize(TPpContext* pp, TParserToken& token)
 783 {
 784     do {
 785         parserToken = &token;
 786         TPpToken ppToken;
 787         int token = pp->tokenize(ppToken);
 788         if (token == EndOfInput)
 789             return 0;
 790
 791         tokenText = ppToken.name;
 792         loc = ppToken.loc;
 793         parserToken->sType.lex.loc = loc;
 794         switch (token) {
 795         case ';':  afterType = false; afterBuffer = false; return SEMICOLON;
 796         case ',':  afterType = false;   return COMMA;
 797         case ':':                       return COLON;
 798         case '=':  afterType = false;   return EQUAL;
 799         case '(':  afterType = false;   return LEFT_PAREN;
 800         case ')':  afterType = false;   return RIGHT_PAREN;
 801         case '.':  field = true;        return DOT;
 802         case '!':                       return BANG;
 803         case '-':                       return DASH;
 804         case '~':                       return TILDE;
 805         case '+':                       return PLUS;
 806         case '*':                       return STAR;
 807         case '/':                       return SLASH;
 808         case '%':                       return PERCENT;
 809         case '<':                       return LEFT_ANGLE;
 810         case '>':                       return RIGHT_ANGLE;
 811         case '|':                       return VERTICAL_BAR;
 812         case '^':                       return CARET;
 813         case '&':                       return AMPERSAND;
 814         case '?':                       return QUESTION;
 815         case '[':                       return LEFT_BRACKET;
 816         case ']':                       return RIGHT_BRACKET;
 817         case '{':  afterStruct = false; afterBuffer = false; return LEFT_BRACE;
 818         case '}':                       return RIGHT_BRACE;
 819         case '\\':
 820             parseContext.error(loc, "illegal use of escape character", "\\", "");
 821             break;
 822
 823         case PPAtomAddAssign:          return ADD_ASSIGN;
 824         case PPAtomSubAssign:          return SUB_ASSIGN;
 825         case PPAtomMulAssign:          return MUL_ASSIGN;
 826         case PPAtomDivAssign:          return DIV_ASSIGN;
 827         case PPAtomModAssign:          return MOD_ASSIGN;
 828
 829         case PpAtomRight:              return RIGHT_OP;
 830         case PpAtomLeft:               return LEFT_OP;
 831
 832         case PpAtomRightAssign:        return RIGHT_ASSIGN;
 833         case PpAtomLeftAssign:         return LEFT_ASSIGN;
 834         case PpAtomAndAssign:          return AND_ASSIGN;
 835         case PpAtomOrAssign:           return OR_ASSIGN;
 836         case PpAtomXorAssign:          return XOR_ASSIGN;
 837
 838         case PpAtomAnd:                return AND_OP;
 839         case PpAtomOr:                 return OR_OP;
 840         case PpAtomXor:                return XOR_OP;
 841
 842         case PpAtomEQ:                 return EQ_OP;
 843         case PpAtomGE:                 return GE_OP;
 844         case PpAtomNE:                 return NE_OP;
 845         case PpAtomLE:                 return LE_OP;
 846
 847         case PpAtomDecrement:          return DEC_OP;
 848         case PpAtomIncrement:          return INC_OP;
 849
 850         case PpAtomColonColon:
 851             parseContext.error(loc, "not supported", "::", "");
 852             break;
 853
 854         case PpAtomConstString:        parserToken->sType.lex.string = NewPoolTString(tokenText);     return STRING_LITERAL;
 855         case PpAtomConstInt:           parserToken->sType.lex.i    = ppToken.ival;       return INTCONSTANT;
 856         case PpAtomConstUint:          parserToken->sType.lex.i    = ppToken.ival;       return UINTCONSTANT;
 857         case PpAtomConstFloat:         parserToken->sType.lex.d    = ppToken.dval;       return FLOATCONSTANT;
 858 #ifndef GLSLANG_WEB
 859         case PpAtomConstInt16:         parserToken->sType.lex.i    = ppToken.ival;       return INT16CONSTANT;
 860         case PpAtomConstUint16:        parserToken->sType.lex.i    = ppToken.ival;       return UINT16CONSTANT;
 861         case PpAtomConstInt64:         parserToken->sType.lex.i64  = ppToken.i64val;     return INT64CONSTANT;
 862         case PpAtomConstUint64:        parserToken->sType.lex.i64  = ppToken.i64val;     return UINT64CONSTANT;
 863         case PpAtomConstDouble:        parserToken->sType.lex.d    = ppToken.dval;       return DOUBLECONSTANT;
 864         case PpAtomConstFloat16:       parserToken->sType.lex.d    = ppToken.dval;       return FLOAT16CONSTANT;
 865 #endif
 866         case PpAtomIdentifier:
 867         {
 868             int token = tokenizeIdentifier();
 869             field = false;
 870             return token;
 871         }
 872
 873         case EndOfInput:               return 0;
 874
 875         default:
 876             char buf[2];
 877             buf[0] = (char)token;
 878             buf[1] = 0;
 879             parseContext.error(loc, "unexpected token", buf, "");
 880             break;
 881         }
 882     } while (true);
 883 }
 884
 885 int TScanContext::tokenizeIdentifier()
 886 {
 887 #ifndef GLSLANG_WEB
 888     if (ReservedSet->find(tokenText) != ReservedSet->end())
 889         return reservedWord();
 890 #endif
 891
 892     auto it = KeywordMap->find(tokenText);
 893     if (it == KeywordMap->end()) {
 894         // Should have an identifier of some sort
 895         return identifierOrType();
 896     }
 897     keyword = it->second;
 898
 899     switch (keyword) {
 900     case CONST:
 901     case UNIFORM:
 902     case IN:
 903     case OUT:
 904     case INOUT:
 905     case BREAK:
 906     case CONTINUE:
 907     case DO:
 908     case FOR:
 909     case WHILE:
 910     case IF:
 911     case ELSE:
 912     case DISCARD:
 913     case RETURN:
 914     case CASE:
 915         return keyword;
 916
 917     case BUFFER:
 918         afterBuffer = true;
 919         if ((parseContext.isEsProfile() && parseContext.version < 310) ||
 920             (!parseContext.isEsProfile() && parseContext.version < 430))
 921             return identifierOrType();
 922         return keyword;
 923
 924     case STRUCT:
 925         afterStruct = true;
 926         return keyword;
 927
 928     case SWITCH:
 929     case DEFAULT:
 930         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
 931             (!parseContext.isEsProfile() && parseContext.version < 130))
 932             reservedWord();
 933         return keyword;
 934
 935     case VOID:
 936     case BOOL:
 937     case FLOAT:
 938     case INT:
 939     case BVEC2:
 940     case BVEC3:
 941     case BVEC4:
 942     case VEC2:
 943     case VEC3:
 944     case VEC4:
 945     case IVEC2:
 946     case IVEC3:
 947     case IVEC4:
 948     case MAT2:
 949     case MAT3:
 950     case MAT4:
 951     case SAMPLER2D:
 952     case SAMPLERCUBE:
 953         afterType = true;
 954         return keyword;
 955
 956     case BOOLCONSTANT:
 957         if (strcmp("true", tokenText) == 0)
 958             parserToken->sType.lex.b = true;
 959         else
 960             parserToken->sType.lex.b = false;
 961         return keyword;
 962
 963     case SMOOTH:
 964         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
 965             (!parseContext.isEsProfile() && parseContext.version < 130))
 966             return identifierOrType();
 967         return keyword;
 968     case FLAT:
 969         if (parseContext.isEsProfile() && parseContext.version < 300)
 970             reservedWord();
 971         else if (!parseContext.isEsProfile() && parseContext.version < 130)
 972             return identifierOrType();
 973         return keyword;
 974     case CENTROID:
 975         if (parseContext.version < 120)
 976             return identifierOrType();
 977         return keyword;
 978     case INVARIANT:
 979         if (!parseContext.isEsProfile() && parseContext.version < 120)
 980             return identifierOrType();
 981         return keyword;
 982     case PACKED:
 983         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
 984             (!parseContext.isEsProfile() && parseContext.version < 330))
 985             return reservedWord();
 986         return identifierOrType();
 987
 988     case RESOURCE:
 989     {
 990         bool reserved = (parseContext.isEsProfile() && parseContext.version >= 300) ||
 991                         (!parseContext.isEsProfile() && parseContext.version >= 420);
 992         return identifierOrReserved(reserved);
 993     }
 994     case SUPERP:
 995     {
 996         bool reserved = parseContext.isEsProfile() || parseContext.version >= 130;
 997         return identifierOrReserved(reserved);
 998     }
 999
1000 #ifndef GLSLANG_WEB
1001     case NOPERSPECTIVE:
1002         if (parseContext.extensionTurnedOn(E_GL_NV_shader_noperspective_interpolation))
1003             return keyword;
1004         return es30ReservedFromGLSL(130);
1005
1006     case NONUNIFORM:
1007         if (parseContext.extensionTurnedOn(E_GL_EXT_nonuniform_qualifier))
1008             return keyword;
1009         else
1010             return identifierOrType();
1011     case ATTRIBUTE:
1012     case VARYING:
1013         if (parseContext.isEsProfile() && parseContext.version >= 300)
1014             reservedWord();
1015         return keyword;
1016     case PAYLOADNV:
1017     case PAYLOADINNV:
1018     case HITATTRNV:
1019     case CALLDATANV:
1020     case CALLDATAINNV:
1021     case ACCSTRUCTNV:
1022         if (parseContext.symbolTable.atBuiltInLevel() ||
1023             parseContext.extensionTurnedOn(E_GL_NV_ray_tracing))
1024             return keyword;
1025         return identifierOrType();
1026     case PAYLOADEXT:
1027     case PAYLOADINEXT:
1028     case HITATTREXT:
1029     case CALLDATAEXT:
1030     case CALLDATAINEXT:
1031     case ACCSTRUCTEXT:
1032         if (parseContext.symbolTable.atBuiltInLevel() ||
1033             parseContext.extensionTurnedOn(E_GL_EXT_ray_query))
1034             return keyword;
1035         return identifierOrType();
1036     case RAYQUERYEXT:
1037         if (parseContext.symbolTable.atBuiltInLevel() ||
1038             (!parseContext.isEsProfile() && parseContext.version >= 460
1039                  && parseContext.extensionTurnedOn(E_GL_EXT_ray_query)))
1040             return keyword;
1041         return identifierOrType();
1042     case ATOMIC_UINT:
1043         if ((parseContext.isEsProfile() && parseContext.version >= 310) ||
1044             parseContext.extensionTurnedOn(E_GL_ARB_shader_atomic_counters))
1045             return keyword;
1046         return es30ReservedFromGLSL(420);
1047
1048     case COHERENT:
1049     case DEVICECOHERENT:
1050     case QUEUEFAMILYCOHERENT:
1051     case WORKGROUPCOHERENT:
1052     case SUBGROUPCOHERENT:
1053     case SHADERCALLCOHERENT:
1054     case NONPRIVATE:
1055     case RESTRICT:
1056     case READONLY:
1057     case WRITEONLY:
1058         if (parseContext.isEsProfile() && parseContext.version >= 310)
1059             return keyword;
1060         return es30ReservedFromGLSL(parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store) ? 130 : 420);
1061     case VOLATILE:
1062         if (parseContext.isEsProfile() && parseContext.version >= 310)
1063             return keyword;
1064         if (! parseContext.symbolTable.atBuiltInLevel() && (parseContext.isEsProfile() ||
1065             (parseContext.version < 420 && ! parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store))))
1066             reservedWord();
1067         return keyword;
1068     case PATCH:
1069         if (parseContext.symbolTable.atBuiltInLevel() ||
1070             (parseContext.isEsProfile() &&
1071              (parseContext.version >= 320 ||
1072               parseContext.extensionsTurnedOn(Num_AEP_tessellation_shader, AEP_tessellation_shader))) ||
1073             (!parseContext.isEsProfile() && parseContext.extensionTurnedOn(E_GL_ARB_tessellation_shader)))
1074             return keyword;
1075
1076         return es30ReservedFromGLSL(400);
1077
1078     case SAMPLE:
1079         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1080             parseContext.extensionsTurnedOn(1, &E_GL_OES_shader_multisample_interpolation))
1081             return keyword;
1082         return es30ReservedFromGLSL(400);
1083
1084     case SUBROUTINE:
1085         return es30ReservedFromGLSL(400);
1086 #endif
1087     case SHARED:
1088         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1089             (!parseContext.isEsProfile() && parseContext.version < 140))
1090             return identifierOrType();
1091         return keyword;
1092     case LAYOUT:
1093     {
1094         const int numLayoutExts = 2;
1095         const char* layoutExts[numLayoutExts] = { E_GL_ARB_shading_language_420pack,
1096                                                   E_GL_ARB_explicit_attrib_location };
1097         if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1098             (!parseContext.isEsProfile() && parseContext.version < 140 &&
1099             ! parseContext.extensionsTurnedOn(numLayoutExts, layoutExts)))
1100             return identifierOrType();
1101         return keyword;
1102     }
1103
1104     case HIGH_PRECISION:
1105     case MEDIUM_PRECISION:
1106     case LOW_PRECISION:
1107     case PRECISION:
1108         return precisionKeyword();
1109
1110     case MAT2X2:
1111     case MAT2X3:
1112     case MAT2X4:
1113     case MAT3X2:
1114     case MAT3X3:
1115     case MAT3X4:
1116     case MAT4X2:
1117     case MAT4X3:
1118     case MAT4X4:
1119         return matNxM();
1120
1121 #ifndef GLSLANG_WEB
1122     case DMAT2:
1123     case DMAT3:
1124     case DMAT4:
1125     case DMAT2X2:
1126     case DMAT2X3:
1127     case DMAT2X4:
1128     case DMAT3X2:
1129     case DMAT3X3:
1130     case DMAT3X4:
1131     case DMAT4X2:
1132     case DMAT4X3:
1133     case DMAT4X4:
1134         return dMat();
1135
1136     case IMAGE1D:
1137     case IIMAGE1D:
1138     case UIMAGE1D:
1139     case IMAGE1DARRAY:
1140     case IIMAGE1DARRAY:
1141     case UIMAGE1DARRAY:
1142     case IMAGE2DRECT:
1143     case IIMAGE2DRECT:
1144     case UIMAGE2DRECT:
1145         afterType = true;
1146         return firstGenerationImage(false);
1147
1148     case IMAGEBUFFER:
1149     case IIMAGEBUFFER:
1150     case UIMAGEBUFFER:
1151         afterType = true;
1152         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1153             parseContext.extensionsTurnedOn(Num_AEP_texture_buffer, AEP_texture_buffer))
1154             return keyword;
1155         return firstGenerationImage(false);
1156
1157     case IMAGE2D:
1158     case IIMAGE2D:
1159     case UIMAGE2D:
1160     case IMAGE3D:
1161     case IIMAGE3D:
1162     case UIMAGE3D:
1163     case IMAGECUBE:
1164     case IIMAGECUBE:
1165     case UIMAGECUBE:
1166     case IMAGE2DARRAY:
1167     case IIMAGE2DARRAY:
1168     case UIMAGE2DARRAY:
1169         afterType = true;
1170         return firstGenerationImage(true);
1171
1172     case IMAGECUBEARRAY:
1173     case IIMAGECUBEARRAY:
1174     case UIMAGECUBEARRAY:
1175         afterType = true;
1176         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1177             parseContext.extensionsTurnedOn(Num_AEP_texture_cube_map_array, AEP_texture_cube_map_array))
1178             return keyword;
1179         return secondGenerationImage();
1180
1181     case IMAGE2DMS:
1182     case IIMAGE2DMS:
1183     case UIMAGE2DMS:
1184     case IMAGE2DMSARRAY:
1185     case IIMAGE2DMSARRAY:
1186     case UIMAGE2DMSARRAY:
1187         afterType = true;
1188         return secondGenerationImage();
1189
1190     case DOUBLE:
1191     case DVEC2:
1192     case DVEC3:
1193     case DVEC4:
1194         afterType = true;
1195         if (parseContext.isEsProfile() || parseContext.version < 150 ||
1196             (!parseContext.symbolTable.atBuiltInLevel() &&
1197               parseContext.version < 400 &&
1198              !parseContext.extensionTurnedOn(E_GL_ARB_gpu_shader_fp64)))
1199             reservedWord();
1200         return keyword;
1201
1202     case INT64_T:
1203     case UINT64_T:
1204     case I64VEC2:
1205     case I64VEC3:
1206     case I64VEC4:
1207     case U64VEC2:
1208     case U64VEC3:
1209     case U64VEC4:
1210         afterType = true;
1211         if (parseContext.symbolTable.atBuiltInLevel() ||
1212             parseContext.extensionTurnedOn(E_GL_ARB_gpu_shader_int64) ||
1213             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1214             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int64))
1215             return keyword;
1216         return identifierOrType();
1217
1218     case INT8_T:
1219     case UINT8_T:
1220     case I8VEC2:
1221     case I8VEC3:
1222     case I8VEC4:
1223     case U8VEC2:
1224     case U8VEC3:
1225     case U8VEC4:
1226         afterType = true;
1227         if (parseContext.symbolTable.atBuiltInLevel() ||
1228             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1229             parseContext.extensionTurnedOn(E_GL_EXT_shader_8bit_storage) ||
1230             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int8))
1231             return keyword;
1232         return identifierOrType();
1233
1234     case INT16_T:
1235     case UINT16_T:
1236     case I16VEC2:
1237     case I16VEC3:
1238     case I16VEC4:
1239     case U16VEC2:
1240     case U16VEC3:
1241     case U16VEC4:
1242         afterType = true;
1243         if (parseContext.symbolTable.atBuiltInLevel() ||
1244             parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_int16) ||
1245             parseContext.extensionTurnedOn(E_GL_EXT_shader_16bit_storage) ||
1246             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1247             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int16))
1248             return keyword;
1249         return identifierOrType();
1250     case INT32_T:
1251     case UINT32_T:
1252     case I32VEC2:
1253     case I32VEC3:
1254     case I32VEC4:
1255     case U32VEC2:
1256     case U32VEC3:
1257     case U32VEC4:
1258         afterType = true;
1259         if (parseContext.symbolTable.atBuiltInLevel() ||
1260             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1261             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_int32))
1262             return keyword;
1263         return identifierOrType();
1264     case FLOAT32_T:
1265     case F32VEC2:
1266     case F32VEC3:
1267     case F32VEC4:
1268     case F32MAT2:
1269     case F32MAT3:
1270     case F32MAT4:
1271     case F32MAT2X2:
1272     case F32MAT2X3:
1273     case F32MAT2X4:
1274     case F32MAT3X2:
1275     case F32MAT3X3:
1276     case F32MAT3X4:
1277     case F32MAT4X2:
1278     case F32MAT4X3:
1279     case F32MAT4X4:
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_float32))
1284             return keyword;
1285         return identifierOrType();
1286
1287     case FLOAT64_T:
1288     case F64VEC2:
1289     case F64VEC3:
1290     case F64VEC4:
1291     case F64MAT2:
1292     case F64MAT3:
1293     case F64MAT4:
1294     case F64MAT2X2:
1295     case F64MAT2X3:
1296     case F64MAT2X4:
1297     case F64MAT3X2:
1298     case F64MAT3X3:
1299     case F64MAT3X4:
1300     case F64MAT4X2:
1301     case F64MAT4X3:
1302     case F64MAT4X4:
1303         afterType = true;
1304         if (parseContext.symbolTable.atBuiltInLevel() ||
1305             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1306             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float64))
1307             return keyword;
1308         return identifierOrType();
1309
1310     case FLOAT16_T:
1311     case F16VEC2:
1312     case F16VEC3:
1313     case F16VEC4:
1314         afterType = true;
1315         if (parseContext.symbolTable.atBuiltInLevel() ||
1316             parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_half_float) ||
1317             parseContext.extensionTurnedOn(E_GL_EXT_shader_16bit_storage) ||
1318             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1319             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float16))
1320             return keyword;
1321
1322         return identifierOrType();
1323
1324     case F16MAT2:
1325     case F16MAT3:
1326     case F16MAT4:
1327     case F16MAT2X2:
1328     case F16MAT2X3:
1329     case F16MAT2X4:
1330     case F16MAT3X2:
1331     case F16MAT3X3:
1332     case F16MAT3X4:
1333     case F16MAT4X2:
1334     case F16MAT4X3:
1335     case F16MAT4X4:
1336         afterType = true;
1337         if (parseContext.symbolTable.atBuiltInLevel() ||
1338             parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_half_float) ||
1339             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types) ||
1340             parseContext.extensionTurnedOn(E_GL_EXT_shader_explicit_arithmetic_types_float16))
1341             return keyword;
1342
1343         return identifierOrType();
1344
1345     case SAMPLERCUBEARRAY:
1346     case SAMPLERCUBEARRAYSHADOW:
1347     case ISAMPLERCUBEARRAY:
1348     case USAMPLERCUBEARRAY:
1349         afterType = true;
1350         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1351             parseContext.extensionsTurnedOn(Num_AEP_texture_cube_map_array, AEP_texture_cube_map_array))
1352             return keyword;
1353         if (parseContext.isEsProfile() || (parseContext.version < 400 && ! parseContext.extensionTurnedOn(E_GL_ARB_texture_cube_map_array)))
1354             reservedWord();
1355         return keyword;
1356
1357     case TEXTURECUBEARRAY:
1358     case ITEXTURECUBEARRAY:
1359     case UTEXTURECUBEARRAY:
1360         if (parseContext.spvVersion.vulkan > 0)
1361             return keyword;
1362         else
1363             return identifierOrType();
1364 #endif
1365
1366     case UINT:
1367     case UVEC2:
1368     case UVEC3:
1369     case UVEC4:
1370     case SAMPLERCUBESHADOW:
1371     case SAMPLER2DARRAY:
1372     case SAMPLER2DARRAYSHADOW:
1373     case ISAMPLER2D:
1374     case ISAMPLER3D:
1375     case ISAMPLERCUBE:
1376     case ISAMPLER2DARRAY:
1377     case USAMPLER2D:
1378     case USAMPLER3D:
1379     case USAMPLERCUBE:
1380     case USAMPLER2DARRAY:
1381         afterType = true;
1382         return nonreservedKeyword(300, 130);
1383
1384     case SAMPLER3D:
1385         afterType = true;
1386         if (parseContext.isEsProfile() && parseContext.version < 300) {
1387             if (!parseContext.extensionTurnedOn(E_GL_OES_texture_3D))
1388                 reservedWord();
1389         }
1390         return keyword;
1391
1392     case SAMPLER2DSHADOW:
1393         afterType = true;
1394         if (parseContext.isEsProfile() && parseContext.version < 300) {
1395             if (!parseContext.extensionTurnedOn(E_GL_EXT_shadow_samplers))
1396                 reservedWord();
1397         }
1398         return keyword;
1399
1400     case TEXTURE2D:
1401     case TEXTURECUBE:
1402     case TEXTURE2DARRAY:
1403     case ITEXTURE2D:
1404     case ITEXTURE3D:
1405     case ITEXTURECUBE:
1406     case ITEXTURE2DARRAY:
1407     case UTEXTURE2D:
1408     case UTEXTURE3D:
1409     case UTEXTURECUBE:
1410     case UTEXTURE2DARRAY:
1411     case TEXTURE3D:
1412     case SAMPLER:
1413     case SAMPLERSHADOW:
1414         if (parseContext.spvVersion.vulkan > 0)
1415             return keyword;
1416         else
1417             return identifierOrType();
1418
1419 #ifndef GLSLANG_WEB
1420     case ISAMPLER1D:
1421     case ISAMPLER1DARRAY:
1422     case SAMPLER1DARRAYSHADOW:
1423     case USAMPLER1D:
1424     case USAMPLER1DARRAY:
1425         afterType = true;
1426         return es30ReservedFromGLSL(130);
1427     case ISAMPLER2DRECT:
1428     case USAMPLER2DRECT:
1429         afterType = true;
1430         return es30ReservedFromGLSL(140);
1431
1432     case SAMPLERBUFFER:
1433         afterType = true;
1434         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1435             parseContext.extensionsTurnedOn(Num_AEP_texture_buffer, AEP_texture_buffer))
1436             return keyword;
1437         return es30ReservedFromGLSL(130);
1438
1439     case ISAMPLERBUFFER:
1440     case USAMPLERBUFFER:
1441         afterType = true;
1442         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1443             parseContext.extensionsTurnedOn(Num_AEP_texture_buffer, AEP_texture_buffer))
1444             return keyword;
1445         return es30ReservedFromGLSL(140);
1446
1447     case SAMPLER2DMS:
1448     case ISAMPLER2DMS:
1449     case USAMPLER2DMS:
1450         afterType = true;
1451         if (parseContext.isEsProfile() && parseContext.version >= 310)
1452             return keyword;
1453         if (!parseContext.isEsProfile() && (parseContext.version > 140 ||
1454             (parseContext.version == 140 && parseContext.extensionsTurnedOn(1, &E_GL_ARB_texture_multisample))))
1455             return keyword;
1456         return es30ReservedFromGLSL(150);
1457
1458     case SAMPLER2DMSARRAY:
1459     case ISAMPLER2DMSARRAY:
1460     case USAMPLER2DMSARRAY:
1461         afterType = true;
1462         if ((parseContext.isEsProfile() && parseContext.version >= 320) ||
1463             parseContext.extensionsTurnedOn(1, &E_GL_OES_texture_storage_multisample_2d_array))
1464             return keyword;
1465         if (!parseContext.isEsProfile() && (parseContext.version > 140 ||
1466             (parseContext.version == 140 && parseContext.extensionsTurnedOn(1, &E_GL_ARB_texture_multisample))))
1467             return keyword;
1468         return es30ReservedFromGLSL(150);
1469
1470     case SAMPLER1D:
1471     case SAMPLER1DSHADOW:
1472         afterType = true;
1473         if (parseContext.isEsProfile())
1474             reservedWord();
1475         return keyword;
1476
1477     case SAMPLER2DRECT:
1478     case SAMPLER2DRECTSHADOW:
1479         afterType = true;
1480         if (parseContext.isEsProfile())
1481             reservedWord();
1482         else if (parseContext.version < 140 && ! parseContext.symbolTable.atBuiltInLevel() && ! parseContext.extensionTurnedOn(E_GL_ARB_texture_rectangle)) {
1483             if (parseContext.relaxedErrors())
1484                 parseContext.requireExtensions(loc, 1, &E_GL_ARB_texture_rectangle, "texture-rectangle sampler keyword");
1485             else
1486                 reservedWord();
1487         }
1488         return keyword;
1489
1490     case SAMPLER1DARRAY:
1491         afterType = true;
1492         if (parseContext.isEsProfile() && parseContext.version == 300)
1493             reservedWord();
1494         else if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1495                  (!parseContext.isEsProfile() && parseContext.version < 130))
1496             return identifierOrType();
1497         return keyword;
1498
1499     case SAMPLEREXTERNALOES:
1500         afterType = true;
1501         if (parseContext.symbolTable.atBuiltInLevel() ||
1502             parseContext.extensionTurnedOn(E_GL_OES_EGL_image_external) ||
1503             parseContext.extensionTurnedOn(E_GL_OES_EGL_image_external_essl3))
1504             return keyword;
1505         return identifierOrType();
1506
1507     case SAMPLEREXTERNAL2DY2YEXT:
1508         afterType = true;
1509         if (parseContext.symbolTable.atBuiltInLevel() ||
1510             parseContext.extensionTurnedOn(E_GL_EXT_YUV_target))
1511             return keyword;
1512         return identifierOrType();
1513
1514     case ITEXTURE1DARRAY:
1515     case UTEXTURE1D:
1516     case ITEXTURE1D:
1517     case UTEXTURE1DARRAY:
1518     case TEXTUREBUFFER:
1519     case ITEXTURE2DRECT:
1520     case UTEXTURE2DRECT:
1521     case ITEXTUREBUFFER:
1522     case UTEXTUREBUFFER:
1523     case TEXTURE2DMS:
1524     case ITEXTURE2DMS:
1525     case UTEXTURE2DMS:
1526     case TEXTURE2DMSARRAY:
1527     case ITEXTURE2DMSARRAY:
1528     case UTEXTURE2DMSARRAY:
1529     case TEXTURE1D:
1530     case TEXTURE2DRECT:
1531     case TEXTURE1DARRAY:
1532         if (parseContext.spvVersion.vulkan > 0)
1533             return keyword;
1534         else
1535             return identifierOrType();
1536
1537     case SUBPASSINPUT:
1538     case SUBPASSINPUTMS:
1539     case ISUBPASSINPUT:
1540     case ISUBPASSINPUTMS:
1541     case USUBPASSINPUT:
1542     case USUBPASSINPUTMS:
1543         if (parseContext.spvVersion.vulkan > 0)
1544             return keyword;
1545         else
1546             return identifierOrType();
1547
1548     case F16SAMPLER1D:
1549     case F16SAMPLER2D:
1550     case F16SAMPLER3D:
1551     case F16SAMPLER2DRECT:
1552     case F16SAMPLERCUBE:
1553     case F16SAMPLER1DARRAY:
1554     case F16SAMPLER2DARRAY:
1555     case F16SAMPLERCUBEARRAY:
1556     case F16SAMPLERBUFFER:
1557     case F16SAMPLER2DMS:
1558     case F16SAMPLER2DMSARRAY:
1559     case F16SAMPLER1DSHADOW:
1560     case F16SAMPLER2DSHADOW:
1561     case F16SAMPLER1DARRAYSHADOW:
1562     case F16SAMPLER2DARRAYSHADOW:
1563     case F16SAMPLER2DRECTSHADOW:
1564     case F16SAMPLERCUBESHADOW:
1565     case F16SAMPLERCUBEARRAYSHADOW:
1566
1567     case F16IMAGE1D:
1568     case F16IMAGE2D:
1569     case F16IMAGE3D:
1570     case F16IMAGE2DRECT:
1571     case F16IMAGECUBE:
1572     case F16IMAGE1DARRAY:
1573     case F16IMAGE2DARRAY:
1574     case F16IMAGECUBEARRAY:
1575     case F16IMAGEBUFFER:
1576     case F16IMAGE2DMS:
1577     case F16IMAGE2DMSARRAY:
1578
1579     case F16TEXTURE1D:
1580     case F16TEXTURE2D:
1581     case F16TEXTURE3D:
1582     case F16TEXTURE2DRECT:
1583     case F16TEXTURECUBE:
1584     case F16TEXTURE1DARRAY:
1585     case F16TEXTURE2DARRAY:
1586     case F16TEXTURECUBEARRAY:
1587     case F16TEXTUREBUFFER:
1588     case F16TEXTURE2DMS:
1589     case F16TEXTURE2DMSARRAY:
1590
1591     case F16SUBPASSINPUT:
1592     case F16SUBPASSINPUTMS:
1593         afterType = true;
1594         if (parseContext.symbolTable.atBuiltInLevel() ||
1595             parseContext.extensionTurnedOn(E_GL_AMD_gpu_shader_half_float_fetch))
1596             return keyword;
1597         return identifierOrType();
1598
1599     case EXPLICITINTERPAMD:
1600         if (parseContext.extensionTurnedOn(E_GL_AMD_shader_explicit_vertex_parameter))
1601             return keyword;
1602         return identifierOrType();
1603
1604     case PERVERTEXNV:
1605         if ((!parseContext.isEsProfile() && parseContext.version >= 450) ||
1606             parseContext.extensionTurnedOn(E_GL_NV_fragment_shader_barycentric))
1607             return keyword;
1608         return identifierOrType();
1609
1610     case PRECISE:
1611         if ((parseContext.isEsProfile() &&
1612              (parseContext.version >= 320 || parseContext.extensionsTurnedOn(Num_AEP_gpu_shader5, AEP_gpu_shader5))) ||
1613             (!parseContext.isEsProfile() && parseContext.version >= 400))
1614             return keyword;
1615         if (parseContext.isEsProfile() && parseContext.version == 310) {
1616             reservedWord();
1617             return keyword;
1618         }
1619         return identifierOrType();
1620
1621     case PERPRIMITIVENV:
1622     case PERVIEWNV:
1623     case PERTASKNV:
1624         if ((!parseContext.isEsProfile() && parseContext.version >= 450) ||
1625             (parseContext.isEsProfile() && parseContext.version >= 320) ||
1626             parseContext.extensionTurnedOn(E_GL_NV_mesh_shader))
1627             return keyword;
1628         return identifierOrType();
1629
1630     case FCOOPMATNV:
1631         afterType = true;
1632         if (parseContext.symbolTable.atBuiltInLevel() ||
1633             parseContext.extensionTurnedOn(E_GL_NV_cooperative_matrix))
1634             return keyword;
1635         return identifierOrType();
1636
1637     case UCOOPMATNV:
1638     case ICOOPMATNV:
1639         afterType = true;
1640         if (parseContext.symbolTable.atBuiltInLevel() ||
1641             parseContext.extensionTurnedOn(E_GL_NV_integer_cooperative_matrix))
1642             return keyword;
1643         return identifierOrType();
1644
1645     case DEMOTE:
1646         if (parseContext.extensionTurnedOn(E_GL_EXT_demote_to_helper_invocation))
1647             return keyword;
1648         else
1649             return identifierOrType();
1650 #endif
1651
1652     default:
1653         parseContext.infoSink.info.message(EPrefixInternalError, "Unknown glslang keyword", loc);
1654         return 0;
1655     }
1656 }
1657
1658 int TScanContext::identifierOrType()
1659 {
1660     parserToken->sType.lex.string = NewPoolTString(tokenText);
1661     if (field)
1662         return IDENTIFIER;
1663
1664     parserToken->sType.lex.symbol = parseContext.symbolTable.find(*parserToken->sType.lex.string);
1665     if ((afterType == false && afterStruct == false) && parserToken->sType.lex.symbol != nullptr) {
1666         if (const TVariable* variable = parserToken->sType.lex.symbol->getAsVariable()) {
1667             if (variable->isUserType() &&
1668                 // treat redeclaration of forward-declared buffer/uniform reference as an identifier
1669                 !(variable->getType().isReference() && afterBuffer)) {
1670                 afterType = true;
1671
1672                 return TYPE_NAME;
1673             }
1674         }
1675     }
1676
1677     return IDENTIFIER;
1678 }
1679
1680 // Give an error for use of a reserved symbol.
1681 // However, allow built-in declarations to use reserved words, to allow
1682 // extension support before the extension is enabled.
1683 int TScanContext::reservedWord()
1684 {
1685     if (! parseContext.symbolTable.atBuiltInLevel())
1686         parseContext.error(loc, "Reserved word.", tokenText, "", "");
1687
1688     return 0;
1689 }
1690
1691 int TScanContext::identifierOrReserved(bool reserved)
1692 {
1693     if (reserved) {
1694         reservedWord();
1695
1696         return 0;
1697     }
1698
1699     if (parseContext.isForwardCompatible())
1700         parseContext.warn(loc, "using future reserved keyword", tokenText, "");
1701
1702     return identifierOrType();
1703 }
1704
1705 // For keywords that suddenly showed up on non-ES (not previously reserved)
1706 // but then got reserved by ES 3.0.
1707 int TScanContext::es30ReservedFromGLSL(int version)
1708 {
1709     if (parseContext.symbolTable.atBuiltInLevel())
1710         return keyword;
1711
1712     if ((parseContext.isEsProfile() && parseContext.version < 300) ||
1713         (!parseContext.isEsProfile() && parseContext.version < version)) {
1714             if (parseContext.isForwardCompatible())
1715                 parseContext.warn(loc, "future reserved word in ES 300 and keyword in GLSL", tokenText, "");
1716
1717             return identifierOrType();
1718     } else if (parseContext.isEsProfile() && parseContext.version >= 300)
1719         reservedWord();
1720
1721     return keyword;
1722 }
1723
1724 // For a keyword that was never reserved, until it suddenly
1725 // showed up, both in an es version and a non-ES version.
1726 int TScanContext::nonreservedKeyword(int esVersion, int nonEsVersion)
1727 {
1728     if ((parseContext.isEsProfile() && parseContext.version < esVersion) ||
1729         (!parseContext.isEsProfile() && parseContext.version < nonEsVersion)) {
1730         if (parseContext.isForwardCompatible())
1731             parseContext.warn(loc, "using future keyword", tokenText, "");
1732
1733         return identifierOrType();
1734     }
1735
1736     return keyword;
1737 }
1738
1739 int TScanContext::precisionKeyword()
1740 {
1741     if (parseContext.isEsProfile() || parseContext.version >= 130)
1742         return keyword;
1743
1744     if (parseContext.isForwardCompatible())
1745         parseContext.warn(loc, "using ES precision qualifier keyword", tokenText, "");
1746
1747     return identifierOrType();
1748 }
1749
1750 int TScanContext::matNxM()
1751 {
1752     afterType = true;
1753
1754     if (parseContext.version > 110)
1755         return keyword;
1756
1757     if (parseContext.isForwardCompatible())
1758         parseContext.warn(loc, "using future non-square matrix type keyword", tokenText, "");
1759
1760     return identifierOrType();
1761 }
1762
1763 int TScanContext::dMat()
1764 {
1765     afterType = true;
1766
1767     if (parseContext.isEsProfile() && parseContext.version >= 300) {
1768         reservedWord();
1769
1770         return keyword;
1771     }
1772
1773     if (!parseContext.isEsProfile() && (parseContext.version >= 400 ||
1774         parseContext.symbolTable.atBuiltInLevel() ||
1775         (parseContext.version >= 150 && parseContext.extensionTurnedOn(E_GL_ARB_gpu_shader_fp64))))
1776         return keyword;
1777
1778     if (parseContext.isForwardCompatible())
1779         parseContext.warn(loc, "using future type keyword", tokenText, "");
1780
1781     return identifierOrType();
1782 }
1783
1784 int TScanContext::firstGenerationImage(bool inEs310)
1785 {
1786     if (parseContext.symbolTable.atBuiltInLevel() ||
1787         (!parseContext.isEsProfile() && (parseContext.version >= 420 ||
1788          parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store))) ||
1789         (inEs310 && parseContext.isEsProfile() && parseContext.version >= 310))
1790         return keyword;
1791
1792     if ((parseContext.isEsProfile() && parseContext.version >= 300) ||
1793         (!parseContext.isEsProfile() && parseContext.version >= 130)) {
1794         reservedWord();
1795
1796         return keyword;
1797     }
1798
1799     if (parseContext.isForwardCompatible())
1800         parseContext.warn(loc, "using future type keyword", tokenText, "");
1801
1802     return identifierOrType();
1803 }
1804
1805 int TScanContext::secondGenerationImage()
1806 {
1807     if (parseContext.isEsProfile() && parseContext.version >= 310) {
1808         reservedWord();
1809         return keyword;
1810     }
1811
1812     if (parseContext.symbolTable.atBuiltInLevel() ||
1813         (!parseContext.isEsProfile() &&
1814          (parseContext.version >= 420 || parseContext.extensionTurnedOn(E_GL_ARB_shader_image_load_store))))
1815         return keyword;
1816
1817     if (parseContext.isForwardCompatible())
1818         parseContext.warn(loc, "using future type keyword", tokenText, "");
1819
1820     return identifierOrType();
1821 }
1822
1823 } // end namespace glslang