glslang/MachineIndependent/Scan.cpp

   1 //
   2 //Copyright (C) 2002-2005  3Dlabs Inc. Ltd.
   3 //Copyright (C) 2013 LunarG, Inc.
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  12 //    notice, this list of conditions and the following disclaimer.
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  25 //LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  26 //FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  27 //COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  28 //INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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  30 //LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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  34 //POSSIBILITY OF SUCH DAMAGE.
  35 //
  36
  37 //
  38 // GLSL scanning, leveraging the scanning done by the preprocessor.
  39 //
  40
  41 #include <string.h>
  42
  43 #include "../Include/Types.h"
  44 #include "SymbolTable.h"
  45 #include "glslang_tab.cpp.h"
  46 #include "ParseHelper.h"
  47 #include "ScanContext.h"
  48 #include "Scan.h"
  49
  50 // preprocessor includes
  51 #include "preprocessor/PpContext.h"
  52 #include "preprocessor/PpTokens.h"
  53
  54 namespace glslang {
  55
  56 // read past any white space
  57 void TInputScanner::consumeWhiteSpace(bool& foundNonSpaceTab)
  58 {
  59     char c = peek();  // don't accidentally consume anything other than whitespace
  60     while (c == ' ' || c == '\t' || c == '\r' || c == '\n') {
  61         if (c == '\r' || c == '\n')
  62             foundNonSpaceTab = true;
  63         get();
  64         c = peek();
  65     }
  66 }
  67
  68 // return true if a comment was actually consumed
  69 bool TInputScanner::consumeComment()
  70 {
  71     if (peek() != '/')
  72         return false;
  73
  74     get();  // consume the '/'
  75     char c = peek();
  76     if (c == '/') {
  77
  78         // a '//' style comment
  79         get();  // consume the second '/'
  80         c = get();
  81         do {
  82             while (c > 0 && c != '\\' && c != '\r' && c != '\n')
  83                 c = get();
  84
  85             if (c <= 0 || c == '\r' || c == '\n') {
  86                 while (c == '\r' || c == '\n')
  87                     c = get();
  88
  89                 // we reached the end of the comment
  90                 break;
  91             } else {
  92                 // it's a '\', so we need to keep going, after skipping what's escaped
  93
  94                 // read the skipped character
  95                 c = get();
  96
  97                 // if it's a two-character newline, skip both characters
  98                 if (c == '\r' && peek() == '\n')
  99                     get();
 100                 c = get();
 101             }
 102         } while (true);
 103
 104         // put back the last non-comment character
 105         if (c > 0)
 106             unget();
 107
 108         return true;
 109     } else if (c == '*') {
 110
 111         // a '/*' style comment
 112         get();  // consume the '*'
 113         c = get();
 114         do {
 115             while (c > 0 && c != '*')
 116                 c = get();
 117             if (c == '*') {
 118                 c = get();
 119                 if (c == '/')
 120                     break;  // end of comment
 121                 // not end of comment
 122             } else // end of input
 123                 break;
 124         } while (true);
 125
 126         return true;
 127     } else {
 128         // it's not a comment, put the '/' back
 129         unget();
 130
 131         return false;
 132     }
 133 }
 134
 135 // skip whitespace, then skip a comment, rinse, repeat
 136 void TInputScanner::consumeWhitespaceComment(bool& foundNonSpaceTab)
 137 {
 138     do {
 139         consumeWhiteSpace(foundNonSpaceTab);
 140
 141         // if not starting a comment now, then done
 142         char c = peek();
 143         if (c != '/' || c < 0)
 144             return;
 145
 146         // skip potential comment
 147         foundNonSpaceTab = true;
 148         if (! consumeComment())
 149             return;
 150
 151     } while (true);
 152 }
 153
 154 // Returns true if there was non-white space (e.g., a comment, newline) before the #version
 155 // or no #version was found; otherwise, returns false.  There is no error case, it always
 156 // succeeds, but will leave version == 0 if no #version was found.
 157 //
 158 // N.B. does not attempt to leave input in any particular known state.  The assumption
 159 // is that scanning will start anew, following the rules for the chosen version/profile,
 160 // and with a corresponding parsing context.
 161 //
 162 bool TInputScanner::scanVersion(int& version, EProfile& profile)
 163 {
 164     // This function doesn't have to get all the semantics correct,
 165     // just find the #version if there is a correct one present.
 166     // The preprocessor will have the responsibility of getting all the semantics right.
 167
 168     version = 0;  // means not found
 169     profile = ENoProfile;
 170
 171     bool foundNonSpaceTab = false;
 172     consumeWhitespaceComment(foundNonSpaceTab);
 173
 174     // #
 175     if (get() != '#')
 176         return true;
 177
 178     // whitespace
 179     char c;
 180     do {
 181         c = get();
 182     } while (c == ' ' || c == '\t');
 183
 184     if (    c != 'v' ||
 185         get() != 'e' ||
 186         get() != 'r' ||
 187         get() != 's' ||
 188         get() != 'i' ||
 189         get() != 'o' ||
 190         get() != 'n')
 191         return true;
 192
 193     // whitespace
 194     do {
 195         c = get();
 196     } while (c == ' ' || c == '\t');
 197
 198     // version number
 199     while (c >= '0' && c <= '9') {
 200         version = 10 * version + (c - '0');
 201         c = get();
 202     }
 203     if (version == 0)
 204         return true;
 205
 206     // whitespace
 207     while (c == ' ' || c == '\t')
 208         c = get();
 209
 210     // profile
 211     const int maxProfileLength = 13;  // not including any 0
 212     char profileString[maxProfileLength];
 213     int profileLength;
 214     for (profileLength = 0; profileLength < maxProfileLength; ++profileLength) {
 215         if (c < 0 || c == ' ' || c == '\t' || c == '\n' || c == '\r')
 216             break;
 217         profileString[profileLength] = c;
 218         c = get();
 219     }
 220     if (c > 0 && c != ' ' && c != '\t' && c != '\n' && c != '\r')
 221         return true;
 222
 223     if (profileLength == 2 && strncmp(profileString, "es", profileLength) == 0)
 224         profile = EEsProfile;
 225     else if (profileLength == 4 && strncmp(profileString, "core", profileLength) == 0)
 226         profile = ECoreProfile;
 227     else if (profileLength == 13 && strncmp(profileString, "compatibility", profileLength) == 0)
 228         profile = ECompatibilityProfile;
 229
 230     return foundNonSpaceTab;
 231 }
 232
 233 // Fill this in when doing glslang-level scanning, to hand back to the parser.
 234 class TParserToken {
 235 public:
 236     explicit TParserToken(YYSTYPE& b) : sType(b) { }
 237
 238     YYSTYPE& sType;
 239 };
 240
 241 } // end namespace glslang
 242
 243 // This is the function the glslang parser (i.e., bison) calls to get its next token
 244 int yylex(YYSTYPE* glslangTokenDesc, glslang::TParseContext& parseContext)
 245 {
 246     glslang::TParserToken token(*glslangTokenDesc);
 247
 248     return parseContext.getScanContext()->tokenize(parseContext.getPpContext(), token);
 249 }
 250
 251 namespace {
 252
 253 // A single global usable by all threads, by all versions, by all languages.
 254 // After a single process-level initialization, this is read only and thread safe
 255 std::map<std::string, int>* KeywordMap = 0;
 256 std::set<std::string>* ReservedSet = 0;
 257
 258 };
 259
 260 namespace glslang {
 261
 262 void TScanContext::fillInKeywordMap()
 263 {
 264     if (KeywordMap != 0) {
 265         // this is really an error, as this should called only once per process
 266         // but, the only risk is if two threads called simultaneously
 267         return;
 268     }
 269     KeywordMap = new std::map<std::string, int>;
 270
 271     (*KeywordMap)["const"] =                   CONST;
 272     (*KeywordMap)["uniform"] =                 UNIFORM;
 273     (*KeywordMap)["in"] =                      IN;
 274     (*KeywordMap)["out"] =                     OUT;
 275     (*KeywordMap)["inout"] =                   INOUT;
 276     (*KeywordMap)["struct"] =                  STRUCT;
 277     (*KeywordMap)["break"] =                   BREAK;
 278     (*KeywordMap)["continue"] =                CONTINUE;
 279     (*KeywordMap)["do"] =                      DO;
 280     (*KeywordMap)["for"] =                     FOR;
 281     (*KeywordMap)["while"] =                   WHILE;
 282     (*KeywordMap)["switch"] =                  SWITCH;
 283     (*KeywordMap)["case"] =                    CASE;
 284     (*KeywordMap)["default"] =                 DEFAULT;
 285     (*KeywordMap)["if"] =                      IF;
 286     (*KeywordMap)["else"] =                    ELSE;
 287     (*KeywordMap)["discard"] =                 DISCARD;
 288     (*KeywordMap)["return"] =                  RETURN;
 289     (*KeywordMap)["void"] =                    VOID;
 290     (*KeywordMap)["bool"] =                    BOOL;
 291     (*KeywordMap)["float"] =                   FLOAT;
 292     (*KeywordMap)["int"] =                     INT;
 293     (*KeywordMap)["bvec2"] =                   BVEC2;
 294     (*KeywordMap)["bvec3"] =                   BVEC3;
 295     (*KeywordMap)["bvec4"] =                   BVEC4;
 296     (*KeywordMap)["vec2"] =                    VEC2;
 297     (*KeywordMap)["vec3"] =                    VEC3;
 298     (*KeywordMap)["vec4"] =                    VEC4;
 299     (*KeywordMap)["ivec2"] =                   IVEC2;
 300     (*KeywordMap)["ivec3"] =                   IVEC3;
 301     (*KeywordMap)["ivec4"] =                   IVEC4;
 302     (*KeywordMap)["mat2"] =                    MAT2;
 303     (*KeywordMap)["mat3"] =                    MAT3;
 304     (*KeywordMap)["mat4"] =                    MAT4;
 305     (*KeywordMap)["sampler2D"] =               SAMPLER2D;
 306     (*KeywordMap)["samplerCube"] =             SAMPLERCUBE;
 307     (*KeywordMap)["true"] =                    BOOLCONSTANT;
 308     (*KeywordMap)["false"] =                   BOOLCONSTANT;
 309     (*KeywordMap)["attribute"] =               ATTRIBUTE;
 310     (*KeywordMap)["varying"] =                 VARYING;
 311     (*KeywordMap)["buffer"] =                  BUFFER;
 312     (*KeywordMap)["coherent"] =                COHERENT;
 313     (*KeywordMap)["restrict"] =                RESTRICT;
 314     (*KeywordMap)["readonly"] =                READONLY;
 315     (*KeywordMap)["writeonly"] =               WRITEONLY;
 316     (*KeywordMap)["atomic_uint"] =             ATOMIC_UINT;
 317     (*KeywordMap)["volatile"] =                VOLATILE;
 318     (*KeywordMap)["layout"] =                  LAYOUT;
 319     (*KeywordMap)["shared"] =                  SHARED;
 320     (*KeywordMap)["patch"] =                   PATCH;
 321     (*KeywordMap)["sample"] =                  SAMPLE;
 322     (*KeywordMap)["subroutine"] =              SUBROUTINE;
 323     (*KeywordMap)["highp"] =                   HIGH_PRECISION;
 324     (*KeywordMap)["mediump"] =                 MEDIUM_PRECISION;
 325     (*KeywordMap)["lowp"] =                    LOW_PRECISION;
 326     (*KeywordMap)["precision"] =               PRECISION;
 327     (*KeywordMap)["mat2x2"] =                  MAT2X2;
 328     (*KeywordMap)["mat2x3"] =                  MAT2X3;
 329     (*KeywordMap)["mat2x4"] =                  MAT2X4;
 330     (*KeywordMap)["mat3x2"] =                  MAT3X2;
 331     (*KeywordMap)["mat3x3"] =                  MAT3X3;
 332     (*KeywordMap)["mat3x4"] =                  MAT3X4;
 333     (*KeywordMap)["mat4x2"] =                  MAT4X2;
 334     (*KeywordMap)["mat4x3"] =                  MAT4X3;
 335     (*KeywordMap)["mat4x4"] =                  MAT4X4;
 336     (*KeywordMap)["dmat2"] =                   DMAT2;
 337     (*KeywordMap)["dmat3"] =                   DMAT3;
 338     (*KeywordMap)["dmat4"] =                   DMAT4;
 339     (*KeywordMap)["dmat2x2"] =                 DMAT2X2;
 340     (*KeywordMap)["dmat2x3"] =                 DMAT2X3;
 341     (*KeywordMap)["dmat2x4"] =                 DMAT2X4;
 342     (*KeywordMap)["dmat3x2"] =                 DMAT3X2;
 343     (*KeywordMap)["dmat3x3"] =                 DMAT3X3;
 344     (*KeywordMap)["dmat3x4"] =                 DMAT3X4;
 345     (*KeywordMap)["dmat4x2"] =                 DMAT4X2;
 346     (*KeywordMap)["dmat4x3"] =                 DMAT4X3;
 347     (*KeywordMap)["dmat4x4"] =                 DMAT4X4;
 348     (*KeywordMap)["image1D"] =                 IMAGE1D;
 349     (*KeywordMap)["iimage1D"] =                IIMAGE1D;
 350     (*KeywordMap)["uimage1D"] =                UIMAGE1D;
 351     (*KeywordMap)["image2D"] =                 IMAGE2D;
 352     (*KeywordMap)["iimage2D"] =                IIMAGE2D;
 353     (*KeywordMap)["uimage2D"] =                UIMAGE2D;
 354     (*KeywordMap)["image3D"] =                 IMAGE3D;
 355     (*KeywordMap)["iimage3D"] =                IIMAGE3D;
 356     (*KeywordMap)["uimage3D"] =                UIMAGE3D;
 357     (*KeywordMap)["image2DRect"] =             IMAGE2DRECT;
 358     (*KeywordMap)["iimage2DRect"] =            IIMAGE2DRECT;
 359     (*KeywordMap)["uimage2DRect"] =            UIMAGE2DRECT;
 360     (*KeywordMap)["imageCube"] =               IMAGECUBE;
 361     (*KeywordMap)["iimageCube"] =              IIMAGECUBE;
 362     (*KeywordMap)["uimageCube"] =              UIMAGECUBE;
 363     (*KeywordMap)["imageBuffer"] =             IMAGEBUFFER;
 364     (*KeywordMap)["iimageBuffer"] =            IIMAGEBUFFER;
 365     (*KeywordMap)["uimageBuffer"] =            UIMAGEBUFFER;
 366     (*KeywordMap)["image1DArray"] =            IMAGE1DARRAY;
 367     (*KeywordMap)["iimage1DArray"] =           IIMAGE1DARRAY;
 368     (*KeywordMap)["uimage1DArray"] =           UIMAGE1DARRAY;
 369     (*KeywordMap)["image2DArray"] =            IMAGE2DARRAY;
 370     (*KeywordMap)["iimage2DArray"] =           IIMAGE2DARRAY;
 371     (*KeywordMap)["uimage2DArray"] =           UIMAGE2DARRAY;
 372     (*KeywordMap)["imageCubeArray"] =          IMAGECUBEARRAY;
 373     (*KeywordMap)["iimageCubeArray"] =         IIMAGECUBEARRAY;
 374     (*KeywordMap)["uimageCubeArray"] =         UIMAGECUBEARRAY;
 375     (*KeywordMap)["image2DMS"] =               IMAGE2DMS;
 376     (*KeywordMap)["iimage2DMS"] =              IIMAGE2DMS;
 377     (*KeywordMap)["uimage2DMS"] =              UIMAGE2DMS;
 378     (*KeywordMap)["image2DMSArray"] =          IMAGE2DMSARRAY;
 379     (*KeywordMap)["iimage2DMSArray"] =         IIMAGE2DMSARRAY;
 380     (*KeywordMap)["uimage2DMSArray"] =         UIMAGE2DMSARRAY;
 381     (*KeywordMap)["double"] =                  DOUBLE;
 382     (*KeywordMap)["dvec2"] =                   DVEC2;
 383     (*KeywordMap)["dvec3"] =                   DVEC3;
 384     (*KeywordMap)["dvec4"] =                   DVEC4;
 385     (*KeywordMap)["samplerCubeArray"] =        SAMPLERCUBEARRAY;
 386     (*KeywordMap)["samplerCubeArrayShadow"] =  SAMPLERCUBEARRAYSHADOW;
 387     (*KeywordMap)["isamplerCubeArray"] =       ISAMPLERCUBEARRAY;
 388     (*KeywordMap)["usamplerCubeArray"] =       USAMPLERCUBEARRAY;
 389     (*KeywordMap)["sampler1DArrayShadow"] =    SAMPLER1DARRAYSHADOW;
 390     (*KeywordMap)["isampler1DArray"] =         ISAMPLER1DARRAY;
 391     (*KeywordMap)["usampler1D"] =              USAMPLER1D;
 392     (*KeywordMap)["isampler1D"] =              ISAMPLER1D;
 393     (*KeywordMap)["usampler1DArray"] =         USAMPLER1DARRAY;
 394     (*KeywordMap)["samplerBuffer"] =           SAMPLERBUFFER;
 395     (*KeywordMap)["uint"] =                    UINT;
 396     (*KeywordMap)["uvec2"] =                   UVEC2;
 397     (*KeywordMap)["uvec3"] =                   UVEC3;
 398     (*KeywordMap)["uvec4"] =                   UVEC4;
 399     (*KeywordMap)["samplerCubeShadow"] =       SAMPLERCUBESHADOW;
 400     (*KeywordMap)["sampler2DArray"] =          SAMPLER2DARRAY;
 401     (*KeywordMap)["sampler2DArrayShadow"] =    SAMPLER2DARRAYSHADOW;
 402     (*KeywordMap)["isampler2D"] =              ISAMPLER2D;
 403     (*KeywordMap)["isampler3D"] =              ISAMPLER3D;
 404     (*KeywordMap)["isamplerCube"] =            ISAMPLERCUBE;
 405     (*KeywordMap)["isampler2DArray"] =         ISAMPLER2DARRAY;
 406     (*KeywordMap)["usampler2D"] =              USAMPLER2D;
 407     (*KeywordMap)["usampler3D"] =              USAMPLER3D;
 408     (*KeywordMap)["usamplerCube"] =            USAMPLERCUBE;
 409     (*KeywordMap)["usampler2DArray"] =         USAMPLER2DARRAY;
 410     (*KeywordMap)["isampler2DRect"] =          ISAMPLER2DRECT;
 411     (*KeywordMap)["usampler2DRect"] =          USAMPLER2DRECT;
 412     (*KeywordMap)["isamplerBuffer"] =          ISAMPLERBUFFER;
 413     (*KeywordMap)["usamplerBuffer"] =          USAMPLERBUFFER;
 414     (*KeywordMap)["sampler2DMS"] =             SAMPLER2DMS;
 415     (*KeywordMap)["isampler2DMS"] =            ISAMPLER2DMS;
 416     (*KeywordMap)["usampler2DMS"] =            USAMPLER2DMS;
 417     (*KeywordMap)["sampler2DMSArray"] =        SAMPLER2DMSARRAY;
 418     (*KeywordMap)["isampler2DMSArray"] =       ISAMPLER2DMSARRAY;
 419     (*KeywordMap)["usampler2DMSArray"] =       USAMPLER2DMSARRAY;
 420     (*KeywordMap)["sampler1D"] =               SAMPLER1D;
 421     (*KeywordMap)["sampler1DShadow"] =         SAMPLER1DSHADOW;
 422     (*KeywordMap)["sampler3D"] =               SAMPLER3D;
 423     (*KeywordMap)["sampler2DShadow"] =         SAMPLER2DSHADOW;
 424     (*KeywordMap)["sampler2DRect"] =           SAMPLER2DRECT;
 425     (*KeywordMap)["sampler2DRectShadow"] =     SAMPLER2DRECTSHADOW;
 426     (*KeywordMap)["sampler1DArray"] =          SAMPLER1DARRAY;
 427     (*KeywordMap)["samplerExternalOES"] =      SAMPLEREXTERNALOES; // GL_OES_EGL_image_external
 428     (*KeywordMap)["noperspective"] =           NOPERSPECTIVE;
 429     (*KeywordMap)["smooth"] =                  SMOOTH;
 430     (*KeywordMap)["flat"] =                    FLAT;
 431     (*KeywordMap)["centroid"] =                CENTROID;
 432     (*KeywordMap)["precise"] =                 PRECISE;
 433     (*KeywordMap)["invariant"] =               INVARIANT;
 434     (*KeywordMap)["packed"] =                  PACKED;
 435     (*KeywordMap)["resource"] =                RESOURCE;
 436     (*KeywordMap)["superp"] =                  SUPERP;
 437
 438     ReservedSet = new std::set<std::string>;
 439
 440     ReservedSet->insert("common");
 441     ReservedSet->insert("partition");
 442     ReservedSet->insert("active");
 443     ReservedSet->insert("asm");
 444     ReservedSet->insert("class");
 445     ReservedSet->insert("union");
 446     ReservedSet->insert("enum");
 447     ReservedSet->insert("typedef");
 448     ReservedSet->insert("template");
 449     ReservedSet->insert("this");
 450     ReservedSet->insert("goto");
 451     ReservedSet->insert("inline");
 452     ReservedSet->insert("noinline");
 453     ReservedSet->insert("public");
 454     ReservedSet->insert("static");
 455     ReservedSet->insert("extern");
 456     ReservedSet->insert("external");
 457     ReservedSet->insert("interface");
 458     ReservedSet->insert("long");
 459     ReservedSet->insert("short");
 460     ReservedSet->insert("half");
 461     ReservedSet->insert("fixed");
 462     ReservedSet->insert("unsigned");
 463     ReservedSet->insert("input");
 464     ReservedSet->insert("output");
 465     ReservedSet->insert("hvec2");
 466     ReservedSet->insert("hvec3");
 467     ReservedSet->insert("hvec4");
 468     ReservedSet->insert("fvec2");
 469     ReservedSet->insert("fvec3");
 470     ReservedSet->insert("fvec4");
 471     ReservedSet->insert("sampler3DRect");
 472     ReservedSet->insert("filter");
 473     ReservedSet->insert("sizeof");
 474     ReservedSet->insert("cast");
 475     ReservedSet->insert("namespace");
 476     ReservedSet->insert("using");
 477 }
 478
 479 int TScanContext::tokenize(TPpContext* pp, TParserToken& token)
 480 {
 481     do {
 482         parserToken = &token;
 483         TPpToken ppToken;
 484         tokenText = pp->tokenize(&ppToken);
 485         if (tokenText == 0)
 486             return 0;
 487
 488         loc = ppToken.loc;
 489         parserToken->sType.lex.loc = loc;
 490         switch (ppToken.token) {
 491         case ';':  afterType = false;   return SEMICOLON;
 492         case ',':  afterType = false;   return COMMA;
 493         case ':':                       return COLON;
 494         case '=':  afterType = false;   return EQUAL;
 495         case '(':  afterType = false;   return LEFT_PAREN;
 496         case ')':  afterType = false;   return RIGHT_PAREN;
 497         case '.':  field = true;        return DOT;
 498         case '!':                       return BANG;
 499         case '-':                       return DASH;
 500         case '~':                       return TILDE;
 501         case '+':                       return PLUS;
 502         case '*':                       return STAR;
 503         case '/':                       return SLASH;
 504         case '%':                       return PERCENT;
 505         case '<':                       return LEFT_ANGLE;
 506         case '>':                       return RIGHT_ANGLE;
 507         case '|':                       return VERTICAL_BAR;
 508         case '^':                       return CARET;
 509         case '&':                       return AMPERSAND;
 510         case '?':                       return QUESTION;
 511         case '[':                       return LEFT_BRACKET;
 512         case ']':                       return RIGHT_BRACKET;
 513         case '{':                       return LEFT_BRACE;
 514         case '}':                       return RIGHT_BRACE;
 515         case '\\':
 516             parseContext.error(loc, "illegal use of escape character", "\\", "");
 517             break;
 518
 519         case CPP_AND_OP:                return AND_OP;
 520         case CPP_SUB_ASSIGN:            return SUB_ASSIGN;
 521         case CPP_MOD_ASSIGN:            return MOD_ASSIGN;
 522         case CPP_ADD_ASSIGN:            return ADD_ASSIGN;
 523         case CPP_DIV_ASSIGN:            return DIV_ASSIGN;
 524         case CPP_MUL_ASSIGN:            return MUL_ASSIGN;
 525         case CPP_EQ_OP:                 return EQ_OP;
 526         case CPP_XOR_OP:                return XOR_OP;
 527         case CPP_GE_OP:                 return GE_OP;
 528         case CPP_RIGHT_OP:              return RIGHT_OP;
 529         case CPP_LE_OP:                 return LE_OP;
 530         case CPP_LEFT_OP:               return LEFT_OP;
 531         case CPP_DEC_OP:                return DEC_OP;
 532         case CPP_NE_OP:                 return NE_OP;
 533         case CPP_OR_OP:                 return OR_OP;
 534         case CPP_INC_OP:                return INC_OP;
 535         case CPP_RIGHT_ASSIGN:          return RIGHT_ASSIGN;
 536         case CPP_LEFT_ASSIGN:           return LEFT_ASSIGN;
 537         case CPP_AND_ASSIGN:            return AND_ASSIGN;
 538         case CPP_OR_ASSIGN:             return OR_ASSIGN;
 539         case CPP_XOR_ASSIGN:            return XOR_ASSIGN;
 540
 541         case CPP_INTCONSTANT:           parserToken->sType.lex.i = ppToken.ival;       return INTCONSTANT;
 542         case CPP_UINTCONSTANT:          parserToken->sType.lex.i = ppToken.ival;       return UINTCONSTANT;
 543         case CPP_FLOATCONSTANT:         parserToken->sType.lex.d = ppToken.dval;       return FLOATCONSTANT;
 544         case CPP_DOUBLECONSTANT:        parserToken->sType.lex.d = ppToken.dval;       return DOUBLECONSTANT;
 545         case CPP_IDENTIFIER:            return tokenizeIdentifier();
 546
 547         case EOF:                       return 0;
 548
 549         default:
 550             char buf[2];
 551             buf[0] = ppToken.token;
 552             buf[1] = 0;
 553             parseContext.error(loc, "unexpected token", buf, "");
 554             break;
 555         }
 556     } while (true);
 557 }
 558
 559 int TScanContext::tokenizeIdentifier()
 560 {
 561     if (ReservedSet->find(tokenText) != ReservedSet->end())
 562         return reservedWord();
 563
 564     std::map<std::string, int>::const_iterator it = KeywordMap->find(tokenText);
 565     if (it == KeywordMap->end()) {
 566         // Should have an identifier of some sort
 567         return identifierOrType();
 568     }
 569     keyword = it->second;
 570     field = false;
 571
 572     switch (keyword) {
 573     case CONST:
 574     case UNIFORM:
 575     case IN:
 576     case OUT:
 577     case INOUT:
 578     case STRUCT:
 579     case BREAK:
 580     case CONTINUE:
 581     case DO:
 582     case FOR:
 583     case WHILE:
 584     case IF:
 585     case ELSE:
 586     case DISCARD:
 587     case RETURN:
 588     case CASE:
 589         return keyword;
 590
 591     case SWITCH:
 592     case DEFAULT:
 593         if ((parseContext.profile == EEsProfile && parseContext.version < 300) ||
 594             (parseContext.profile != EEsProfile && parseContext.version < 130))
 595             reservedWord();
 596         return keyword;
 597
 598     case VOID:
 599     case BOOL:
 600     case FLOAT:
 601     case INT:
 602     case BVEC2:
 603     case BVEC3:
 604     case BVEC4:
 605     case VEC2:
 606     case VEC3:
 607     case VEC4:
 608     case IVEC2:
 609     case IVEC3:
 610     case IVEC4:
 611     case MAT2:
 612     case MAT3:
 613     case MAT4:
 614     case SAMPLER2D:
 615     case SAMPLERCUBE:
 616         afterType = true;
 617         return keyword;
 618
 619     case BOOLCONSTANT:
 620         if (strcmp("true", tokenText) == 0)
 621             parserToken->sType.lex.b = true;
 622         else
 623             parserToken->sType.lex.b = false;
 624         return keyword;
 625
 626     case ATTRIBUTE:
 627     case VARYING:
 628         if (parseContext.profile == EEsProfile && parseContext.version >= 300)
 629             reservedWord();
 630         return keyword;
 631
 632     case BUFFER:
 633         if (parseContext.version < 430)
 634             return identifierOrType();
 635         return keyword;
 636
 637     case COHERENT:
 638     case RESTRICT:
 639     case READONLY:
 640     case WRITEONLY:
 641     case ATOMIC_UINT:
 642         return es30ReservedFromGLSL(420);
 643
 644     case VOLATILE:
 645         if (parseContext.profile == EEsProfile || parseContext.version < 420)
 646             reservedWord();
 647         return keyword;
 648
 649     case LAYOUT:
 650     case SHARED:
 651         if ((parseContext.profile == EEsProfile && parseContext.version < 300) ||
 652             (parseContext.profile != EEsProfile && parseContext.version < 140))
 653             return identifierOrType();
 654         return keyword;
 655
 656     case PATCH:
 657         if (parseContext.symbolTable.atBuiltInLevel() || parseContext.extensionsTurnedOn(1, &GL_ARB_tessellation_shader))
 658             return es30ReservedFromGLSL(150);
 659         else
 660             return es30ReservedFromGLSL(400);
 661
 662     case SAMPLE:
 663     case SUBROUTINE:
 664         return es30ReservedFromGLSL(400);
 665
 666     case HIGH_PRECISION:
 667     case MEDIUM_PRECISION:
 668     case LOW_PRECISION:
 669     case PRECISION:
 670         return precisionKeyword();
 671
 672     case MAT2X2:
 673     case MAT2X3:
 674     case MAT2X4:
 675     case MAT3X2:
 676     case MAT3X3:
 677     case MAT3X4:
 678     case MAT4X2:
 679     case MAT4X3:
 680     case MAT4X4:
 681         return matNxM();
 682
 683     case DMAT2:
 684     case DMAT3:
 685     case DMAT4:
 686     case DMAT2X2:
 687     case DMAT2X3:
 688     case DMAT2X4:
 689     case DMAT3X2:
 690     case DMAT3X3:
 691     case DMAT3X4:
 692     case DMAT4X2:
 693     case DMAT4X3:
 694     case DMAT4X4:
 695         return dMat();
 696
 697     case IMAGE1D:
 698     case IIMAGE1D:
 699     case UIMAGE1D:
 700     case IMAGE2D:
 701     case IIMAGE2D:
 702     case UIMAGE2D:
 703     case IMAGE3D:
 704     case IIMAGE3D:
 705     case UIMAGE3D:
 706     case IMAGE2DRECT:
 707     case IIMAGE2DRECT:
 708     case UIMAGE2DRECT:
 709     case IMAGECUBE:
 710     case IIMAGECUBE:
 711     case UIMAGECUBE:
 712     case IMAGEBUFFER:
 713     case IIMAGEBUFFER:
 714     case UIMAGEBUFFER:
 715     case IMAGE1DARRAY:
 716     case IIMAGE1DARRAY:
 717     case UIMAGE1DARRAY:
 718     case IMAGE2DARRAY:
 719     case IIMAGE2DARRAY:
 720     case UIMAGE2DARRAY:
 721         return firstGenerationImage();
 722
 723     case IMAGECUBEARRAY:
 724     case IIMAGECUBEARRAY:
 725     case UIMAGECUBEARRAY:
 726     case IMAGE2DMS:
 727     case IIMAGE2DMS:
 728     case UIMAGE2DMS:
 729     case IMAGE2DMSARRAY:
 730     case IIMAGE2DMSARRAY:
 731     case UIMAGE2DMSARRAY:
 732         return secondGenerationImage();
 733
 734     case DOUBLE:
 735     case DVEC2:
 736     case DVEC3:
 737     case DVEC4:
 738         afterType = true;
 739         if (parseContext.profile == EEsProfile || parseContext.version < 400)
 740             reservedWord();
 741         return keyword;
 742
 743     case SAMPLERCUBEARRAY:
 744     case SAMPLERCUBEARRAYSHADOW:
 745     case ISAMPLERCUBEARRAY:
 746     case USAMPLERCUBEARRAY:
 747         afterType = true;
 748         if (parseContext.profile == EEsProfile || (parseContext.version < 400 && ! parseContext.extensionsTurnedOn(1, &GL_ARB_texture_cube_map_array)))
 749             reservedWord();
 750         return keyword;
 751
 752     case ISAMPLER1D:
 753     case ISAMPLER1DARRAY:
 754     case SAMPLER1DARRAYSHADOW:
 755     case USAMPLER1D:
 756     case USAMPLER1DARRAY:
 757     case SAMPLERBUFFER:
 758         afterType = true;
 759         return es30ReservedFromGLSL(130);
 760
 761     case UINT:
 762     case UVEC2:
 763     case UVEC3:
 764     case UVEC4:
 765     case SAMPLERCUBESHADOW:
 766     case SAMPLER2DARRAY:
 767     case SAMPLER2DARRAYSHADOW:
 768     case ISAMPLER2D:
 769     case ISAMPLER3D:
 770     case ISAMPLERCUBE:
 771     case ISAMPLER2DARRAY:
 772     case USAMPLER2D:
 773     case USAMPLER3D:
 774     case USAMPLERCUBE:
 775     case USAMPLER2DARRAY:
 776         afterType = true;
 777         return nonreservedKeyword(300, 130);
 778
 779     case ISAMPLER2DRECT:
 780     case USAMPLER2DRECT:
 781     case ISAMPLERBUFFER:
 782     case USAMPLERBUFFER:
 783         afterType = true;
 784         return es30ReservedFromGLSL(140);
 785
 786     case SAMPLER2DMS:
 787     case ISAMPLER2DMS:
 788     case USAMPLER2DMS:
 789     case SAMPLER2DMSARRAY:
 790     case ISAMPLER2DMSARRAY:
 791     case USAMPLER2DMSARRAY:
 792         afterType = true;
 793         return es30ReservedFromGLSL(150);
 794
 795     case SAMPLER1D:
 796     case SAMPLER1DSHADOW:
 797         afterType = true;
 798         if (parseContext.profile == EEsProfile)
 799             reservedWord();
 800         return keyword;
 801
 802     case SAMPLER3D:
 803         afterType = true;
 804         if (parseContext.profile == EEsProfile && parseContext.version < 300) {
 805             if (! parseContext.extensionsTurnedOn(1, &GL_OES_texture_3D))
 806                 reservedWord();
 807         }
 808         return keyword;
 809
 810     case SAMPLER2DSHADOW:
 811         afterType = true;
 812         if (parseContext.profile == EEsProfile && parseContext.version < 300)
 813             reservedWord();
 814         return keyword;
 815
 816     case SAMPLER2DRECT:
 817     case SAMPLER2DRECTSHADOW:
 818         afterType = true;
 819         if (parseContext.profile == EEsProfile)
 820             reservedWord();
 821         else if (parseContext.version < 140 && ! parseContext.symbolTable.atBuiltInLevel() && ! parseContext.extensionsTurnedOn(1, &GL_ARB_texture_rectangle))
 822             reservedWord();
 823         return keyword;
 824
 825     case SAMPLER1DARRAY:
 826         afterType = true;
 827         if (parseContext.profile == EEsProfile && parseContext.version == 300)
 828             reservedWord();
 829         else if ((parseContext.profile == EEsProfile && parseContext.version < 300) ||
 830                  (parseContext.profile != EEsProfile && parseContext.version < 130))
 831             return identifierOrType();
 832         return keyword;
 833
 834     case SAMPLEREXTERNALOES:
 835         afterType = true;
 836         if (parseContext.symbolTable.atBuiltInLevel() || parseContext.extensionsTurnedOn(1, &GL_OES_EGL_image_external))
 837             return keyword;
 838         return identifierOrType();
 839
 840     case NOPERSPECTIVE:
 841         return es30ReservedFromGLSL(130);
 842
 843     case SMOOTH:
 844         if ((parseContext.profile == EEsProfile && parseContext.version < 300) ||
 845             (parseContext.profile != EEsProfile && parseContext.version < 130))
 846             return identifierOrType();
 847         return keyword;
 848
 849     case FLAT:
 850         if (parseContext.profile == EEsProfile && parseContext.version < 300)
 851             reservedWord();
 852         else if (parseContext.profile != EEsProfile && parseContext.version < 130)
 853             return identifierOrType();
 854         return keyword;
 855
 856     case CENTROID:
 857         if (parseContext.version < 120)
 858             return identifierOrType();
 859         return keyword;
 860
 861     case PRECISE:
 862         if (parseContext.profile == EEsProfile ||
 863             (parseContext.profile != EEsProfile && parseContext.version < 400))
 864             return identifierOrType();
 865         return keyword;
 866
 867     case INVARIANT:
 868         if (parseContext.profile != EEsProfile && parseContext.version < 120)
 869             return identifierOrType();
 870         return keyword;
 871
 872     case PACKED:
 873         if ((parseContext.profile == EEsProfile && parseContext.version < 300) ||
 874             (parseContext.profile != EEsProfile && parseContext.version < 330))
 875             return reservedWord();
 876         return identifierOrType();
 877
 878     case RESOURCE:
 879     {
 880         bool reserved = (parseContext.profile == EEsProfile && parseContext.version >= 300) ||
 881                         (parseContext.profile != EEsProfile && parseContext.version >= 420);
 882         return identifierOrReserved(reserved);
 883     }
 884     case SUPERP:
 885     {
 886         bool reserved = parseContext.profile == EEsProfile || parseContext.version >= 130;
 887         return identifierOrReserved(reserved);
 888     }
 889
 890     default:
 891         parseContext.infoSink.info.message(EPrefixInternalError, "Unknown glslang keyword", loc);
 892         return 0;
 893     }
 894 }
 895
 896 int TScanContext::identifierOrType()
 897 {
 898     parserToken->sType.lex.string = NewPoolTString(tokenText);
 899     if (field) {
 900         field = false;
 901
 902         return FIELD_SELECTION;
 903     }
 904
 905     parserToken->sType.lex.symbol = parseContext.symbolTable.find(*parserToken->sType.lex.string);
 906     if (afterType == false && parserToken->sType.lex.symbol) {
 907         if (const TVariable* variable = parserToken->sType.lex.symbol->getAsVariable()) {
 908             if (variable->isUserType()) {
 909                 afterType = true;
 910
 911                 return TYPE_NAME;
 912             }
 913         }
 914     }
 915
 916     return IDENTIFIER;
 917 }
 918
 919 // Give an error for use of a reserved symbol.
 920 // However, allow built-in declarations to use reserved words, to allow
 921 // extension support before the extension is enabled.
 922 int TScanContext::reservedWord()
 923 {
 924     if (! parseContext.symbolTable.atBuiltInLevel())
 925         parseContext.error(loc, "Reserved word.", tokenText, "", "");
 926
 927     return 0;
 928 }
 929
 930 int TScanContext::identifierOrReserved(bool reserved)
 931 {
 932     if (reserved) {
 933         reservedWord();
 934
 935         return 0;
 936     }
 937
 938     if (parseContext.forwardCompatible)
 939         parseContext.warn(loc, "using future reserved keyword", tokenText, "");
 940
 941     return identifierOrType();
 942 }
 943
 944 // For keywords that suddenly showed up on non-ES (not previously reserved)
 945 // but then got reserved by ES 3.0.
 946 int TScanContext::es30ReservedFromGLSL(int version)
 947 {
 948     if ((parseContext.profile == EEsProfile && parseContext.version < 300) ||
 949         (parseContext.profile != EEsProfile && parseContext.version < version)) {
 950             if (parseContext.forwardCompatible)
 951                 parseContext.warn(loc, "future reserved word in ES 300 and keyword in GLSL", tokenText, "");
 952
 953             return identifierOrType();
 954     } else if (parseContext.profile == EEsProfile && parseContext.version >= 300)
 955         reservedWord();
 956
 957     return keyword;
 958 }
 959
 960 // For a keyword that was never reserved, until it suddenly
 961 // showed up, both in an es version and a non-ES version.
 962 int TScanContext::nonreservedKeyword(int esVersion, int nonEsVersion)
 963 {
 964     if ((parseContext.profile == EEsProfile && parseContext.version < esVersion) ||
 965         (parseContext.profile != EEsProfile && parseContext.version < nonEsVersion)) {
 966         if (parseContext.forwardCompatible)
 967             parseContext.warn(loc, "using future keyword", tokenText, "");
 968
 969         return identifierOrType();
 970     }
 971
 972     return keyword;
 973 }
 974
 975 int TScanContext::precisionKeyword()
 976 {
 977     if (parseContext.profile == EEsProfile || parseContext.version >= 130)
 978         return keyword;
 979
 980     if (parseContext.forwardCompatible)
 981         parseContext.warn(loc, "using ES precision qualifier keyword", tokenText, "");
 982
 983     return identifierOrType();
 984 }
 985
 986 int TScanContext::matNxM()
 987 {
 988     afterType = true;
 989
 990     if (parseContext.version > 110)
 991         return keyword;
 992
 993     if (parseContext.forwardCompatible)
 994         parseContext.warn(loc, "using future non-square matrix type keyword", tokenText, "");
 995
 996     return identifierOrType();
 997 }
 998
 999 int TScanContext::dMat()
1000 {
1001     afterType = true;
1002
1003     if (parseContext.profile == EEsProfile && parseContext.version >= 300) {
1004         reservedWord();
1005
1006         return keyword;
1007     }
1008
1009     if (parseContext.profile != EEsProfile && parseContext.version >= 400)
1010         return keyword;
1011
1012     if (parseContext.forwardCompatible)
1013         parseContext.warn(loc, "using future type keyword", tokenText, "");
1014
1015     return identifierOrType();
1016 }
1017
1018 int TScanContext::firstGenerationImage()
1019 {
1020     afterType = true;
1021
1022     if (parseContext.profile != EEsProfile && parseContext.version >= 420)
1023         return keyword;
1024
1025     if ((parseContext.profile == EEsProfile && parseContext.version >= 300) ||
1026         (parseContext.profile != EEsProfile && parseContext.version >= 130)) {
1027         reservedWord();
1028
1029         return keyword;
1030     }
1031
1032     if (parseContext.forwardCompatible)
1033         parseContext.warn(loc, "using future type keyword", tokenText, "");
1034
1035     return identifierOrType();
1036 }
1037
1038 int TScanContext::secondGenerationImage()
1039 {
1040     afterType = true;
1041
1042     if (parseContext.profile != EEsProfile && parseContext.version >= 420)
1043         return keyword;
1044
1045     if (parseContext.forwardCompatible)
1046         parseContext.warn(loc, "using future type keyword", tokenText, "");
1047
1048     return identifierOrType();
1049 }
1050
1051 } // end namespace glslang