glslang/MachineIndependent/Scan.cpp

   1 //
   2 //Copyright (C) 2002-2005  3Dlabs Inc. Ltd.
   3 //Copyright (C) 2013 LunarG, Inc.
   4 //
   5 //All rights reserved.
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   8 //modification, are permitted provided that the following conditions
   9 //are met:
  10 //
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  12 //    notice, this list of conditions and the following disclaimer.
  13 //
  14 //    Redistributions in binary form must reproduce the above
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  16 //    disclaimer in the documentation and/or other materials provided
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  20 //    contributors may be used to endorse or promote products derived
  21 //    from this software without specific prior written permission.
  22 //
  23 //THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24 //"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  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,
  29 //BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  30 //LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  31 //CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32 //LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  33 //ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  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 "ParseHelper.h"
  46 #include "glslang_tab.cpp.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     int 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     int 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         int 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 // Sets versionNotFirstToken based on whether tokens (beyond white space and comments)
 159 // appeared before the #version.
 160 //
 161 // N.B. does not attempt to leave input in any particular known state.  The assumption
 162 // is that scanning will start anew, following the rules for the chosen version/profile,
 163 // and with a corresponding parsing context.
 164 //
 165 bool TInputScanner::scanVersion(int& version, EProfile& profile, bool& notFirstToken)
 166 {
 167     // This function doesn't have to get all the semantics correct,
 168     // just find the #version if there is a correct one present.
 169     // The preprocessor will have the responsibility of getting all the semantics right.
 170
 171     bool versionNotFirst = false;  // means not first WRT comments and white space, nothing more
 172     notFirstToken = false;         // means not first WRT to real tokens
 173     version = 0;  // means not found
 174     profile = ENoProfile;
 175
 176     bool foundNonSpaceTab = false;
 177     bool lookingInMiddle = false;
 178     int c;
 179     do {
 180         if (lookingInMiddle) {
 181             notFirstToken = true;
 182             // make forward progress by finishing off the current line plus extra new lines
 183             if (peek() == '\n' || peek() == '\r') {
 184                 while (peek() == '\n' || peek() == '\r')
 185                     get();
 186             } else
 187                 do {
 188                     c = get();
 189                 } while (c > 0 && c != '\n' && c != '\r');
 190                 while (peek() == '\n' || peek() == '\r')
 191                     get();
 192                 if (peek() < 0)
 193                     return true;
 194         }
 195         lookingInMiddle = true;
 196
 197         // Nominal start, skipping the desktop allowed comments and white space, but tracking if
 198         // something else was found for ES:
 199         consumeWhitespaceComment(foundNonSpaceTab);
 200         if (foundNonSpaceTab)
 201             versionNotFirst = true;
 202
 203         // "#"
 204         if (get() != '#') {
 205             versionNotFirst = true;
 206             continue;
 207         }
 208
 209         // whitespace
 210         do {
 211             c = get();
 212         } while (c == ' ' || c == '\t');
 213
 214         // "version"
 215         if (    c != 'v' ||
 216             get() != 'e' ||
 217             get() != 'r' ||
 218             get() != 's' ||
 219             get() != 'i' ||
 220             get() != 'o' ||
 221             get() != 'n') {
 222             versionNotFirst = true;
 223             continue;
 224         }
 225
 226         // whitespace
 227         do {
 228             c = get();
 229         } while (c == ' ' || c == '\t');
 230
 231         // version number
 232         while (c >= '0' && c <= '9') {
 233             version = 10 * version + (c - '0');
 234             c = get();
 235         }
 236         if (version == 0) {
 237             versionNotFirst = true;
 238             continue;
 239         }
 240
 241         // whitespace
 242         while (c == ' ' || c == '\t')
 243             c = get();
 244
 245         // profile
 246         const int maxProfileLength = 13;  // not including any 0
 247         char profileString[maxProfileLength];
 248         int profileLength;
 249         for (profileLength = 0; profileLength < maxProfileLength; ++profileLength) {
 250             if (c < 0 || c == ' ' || c == '\t' || c == '\n' || c == '\r')
 251                 break;
 252             profileString[profileLength] = c;
 253             c = get();
 254         }
 255         if (c > 0 && c != ' ' && c != '\t' && c != '\n' && c != '\r') {
 256             versionNotFirst = true;
 257             continue;
 258         }
 259
 260         if (profileLength == 2 && strncmp(profileString, "es", profileLength) == 0)
 261             profile = EEsProfile;
 262         else if (profileLength == 4 && strncmp(profileString, "core", profileLength) == 0)
 263             profile = ECoreProfile;
 264         else if (profileLength == 13 && strncmp(profileString, "compatibility", profileLength) == 0)
 265             profile = ECompatibilityProfile;
 266
 267         return versionNotFirst;
 268     } while (true);
 269 }
 270
 271 // Fill this in when doing glslang-level scanning, to hand back to the parser.
 272 class TParserToken {
 273 public:
 274     explicit TParserToken(YYSTYPE& b) : sType(b) { }
 275
 276     YYSTYPE& sType;
 277 };
 278
 279 } // end namespace glslang
 280
 281 // This is the function the glslang parser (i.e., bison) calls to get its next token
 282 int yylex(YYSTYPE* glslangTokenDesc, glslang::TParseContext& parseContext)
 283 {
 284     glslang::TParserToken token(*glslangTokenDesc);
 285
 286     return parseContext.getScanContext()->tokenize(parseContext.getPpContext(), token);
 287 }
 288
 289 namespace {
 290
 291 // A single global usable by all threads, by all versions, by all languages.
 292 // After a single process-level initialization, this is read only and thread safe
 293 std::map<std::string, int>* KeywordMap = 0;
 294 std::set<std::string>* ReservedSet = 0;
 295
 296 };
 297
 298 namespace glslang {
 299
 300 void TScanContext::fillInKeywordMap()
 301 {
 302     if (KeywordMap != 0) {
 303         // this is really an error, as this should called only once per process
 304         // but, the only risk is if two threads called simultaneously
 305         return;
 306     }
 307     KeywordMap = new std::map<std::string, int>;
 308
 309     (*KeywordMap)["const"] =                   CONST;
 310     (*KeywordMap)["uniform"] =                 UNIFORM;
 311     (*KeywordMap)["in"] =                      IN;
 312     (*KeywordMap)["out"] =                     OUT;
 313     (*KeywordMap)["inout"] =                   INOUT;
 314     (*KeywordMap)["struct"] =                  STRUCT;
 315     (*KeywordMap)["break"] =                   BREAK;
 316     (*KeywordMap)["continue"] =                CONTINUE;
 317     (*KeywordMap)["do"] =                      DO;
 318     (*KeywordMap)["for"] =                     FOR;
 319     (*KeywordMap)["while"] =                   WHILE;
 320     (*KeywordMap)["switch"] =                  SWITCH;
 321     (*KeywordMap)["case"] =                    CASE;
 322     (*KeywordMap)["default"] =                 DEFAULT;
 323     (*KeywordMap)["if"] =                      IF;
 324     (*KeywordMap)["else"] =                    ELSE;
 325     (*KeywordMap)["discard"] =                 DISCARD;
 326     (*KeywordMap)["return"] =                  RETURN;
 327     (*KeywordMap)["void"] =                    VOID;
 328     (*KeywordMap)["bool"] =                    BOOL;
 329     (*KeywordMap)["float"] =                   FLOAT;
 330     (*KeywordMap)["int"] =                     INT;
 331     (*KeywordMap)["bvec2"] =                   BVEC2;
 332     (*KeywordMap)["bvec3"] =                   BVEC3;
 333     (*KeywordMap)["bvec4"] =                   BVEC4;
 334     (*KeywordMap)["vec2"] =                    VEC2;
 335     (*KeywordMap)["vec3"] =                    VEC3;
 336     (*KeywordMap)["vec4"] =                    VEC4;
 337     (*KeywordMap)["ivec2"] =                   IVEC2;
 338     (*KeywordMap)["ivec3"] =                   IVEC3;
 339     (*KeywordMap)["ivec4"] =                   IVEC4;
 340     (*KeywordMap)["mat2"] =                    MAT2;
 341     (*KeywordMap)["mat3"] =                    MAT3;
 342     (*KeywordMap)["mat4"] =                    MAT4;
 343     (*KeywordMap)["sampler2D"] =               SAMPLER2D;
 344     (*KeywordMap)["samplerCube"] =             SAMPLERCUBE;
 345     (*KeywordMap)["true"] =                    BOOLCONSTANT;
 346     (*KeywordMap)["false"] =                   BOOLCONSTANT;
 347     (*KeywordMap)["attribute"] =               ATTRIBUTE;
 348     (*KeywordMap)["varying"] =                 VARYING;
 349     (*KeywordMap)["buffer"] =                  BUFFER;
 350     (*KeywordMap)["coherent"] =                COHERENT;
 351     (*KeywordMap)["restrict"] =                RESTRICT;
 352     (*KeywordMap)["readonly"] =                READONLY;
 353     (*KeywordMap)["writeonly"] =               WRITEONLY;
 354     (*KeywordMap)["atomic_uint"] =             ATOMIC_UINT;
 355     (*KeywordMap)["volatile"] =                VOLATILE;
 356     (*KeywordMap)["layout"] =                  LAYOUT;
 357     (*KeywordMap)["shared"] =                  SHARED;
 358     (*KeywordMap)["patch"] =                   PATCH;
 359     (*KeywordMap)["sample"] =                  SAMPLE;
 360     (*KeywordMap)["subroutine"] =              SUBROUTINE;
 361     (*KeywordMap)["highp"] =                   HIGH_PRECISION;
 362     (*KeywordMap)["mediump"] =                 MEDIUM_PRECISION;
 363     (*KeywordMap)["lowp"] =                    LOW_PRECISION;
 364     (*KeywordMap)["precision"] =               PRECISION;
 365     (*KeywordMap)["mat2x2"] =                  MAT2X2;
 366     (*KeywordMap)["mat2x3"] =                  MAT2X3;
 367     (*KeywordMap)["mat2x4"] =                  MAT2X4;
 368     (*KeywordMap)["mat3x2"] =                  MAT3X2;
 369     (*KeywordMap)["mat3x3"] =                  MAT3X3;
 370     (*KeywordMap)["mat3x4"] =                  MAT3X4;
 371     (*KeywordMap)["mat4x2"] =                  MAT4X2;
 372     (*KeywordMap)["mat4x3"] =                  MAT4X3;
 373     (*KeywordMap)["mat4x4"] =                  MAT4X4;
 374     (*KeywordMap)["dmat2"] =                   DMAT2;
 375     (*KeywordMap)["dmat3"] =                   DMAT3;
 376     (*KeywordMap)["dmat4"] =                   DMAT4;
 377     (*KeywordMap)["dmat2x2"] =                 DMAT2X2;
 378     (*KeywordMap)["dmat2x3"] =                 DMAT2X3;
 379     (*KeywordMap)["dmat2x4"] =                 DMAT2X4;
 380     (*KeywordMap)["dmat3x2"] =                 DMAT3X2;
 381     (*KeywordMap)["dmat3x3"] =                 DMAT3X3;
 382     (*KeywordMap)["dmat3x4"] =                 DMAT3X4;
 383     (*KeywordMap)["dmat4x2"] =                 DMAT4X2;
 384     (*KeywordMap)["dmat4x3"] =                 DMAT4X3;
 385     (*KeywordMap)["dmat4x4"] =                 DMAT4X4;
 386     (*KeywordMap)["image1D"] =                 IMAGE1D;
 387     (*KeywordMap)["iimage1D"] =                IIMAGE1D;
 388     (*KeywordMap)["uimage1D"] =                UIMAGE1D;
 389     (*KeywordMap)["image2D"] =                 IMAGE2D;
 390     (*KeywordMap)["iimage2D"] =                IIMAGE2D;
 391     (*KeywordMap)["uimage2D"] =                UIMAGE2D;
 392     (*KeywordMap)["image3D"] =                 IMAGE3D;
 393     (*KeywordMap)["iimage3D"] =                IIMAGE3D;
 394     (*KeywordMap)["uimage3D"] =                UIMAGE3D;
 395     (*KeywordMap)["image2DRect"] =             IMAGE2DRECT;
 396     (*KeywordMap)["iimage2DRect"] =            IIMAGE2DRECT;
 397     (*KeywordMap)["uimage2DRect"] =            UIMAGE2DRECT;
 398     (*KeywordMap)["imageCube"] =               IMAGECUBE;
 399     (*KeywordMap)["iimageCube"] =              IIMAGECUBE;
 400     (*KeywordMap)["uimageCube"] =              UIMAGECUBE;
 401     (*KeywordMap)["imageBuffer"] =             IMAGEBUFFER;
 402     (*KeywordMap)["iimageBuffer"] =            IIMAGEBUFFER;
 403     (*KeywordMap)["uimageBuffer"] =            UIMAGEBUFFER;
 404     (*KeywordMap)["image1DArray"] =            IMAGE1DARRAY;
 405     (*KeywordMap)["iimage1DArray"] =           IIMAGE1DARRAY;
 406     (*KeywordMap)["uimage1DArray"] =           UIMAGE1DARRAY;
 407     (*KeywordMap)["image2DArray"] =            IMAGE2DARRAY;
 408     (*KeywordMap)["iimage2DArray"] =           IIMAGE2DARRAY;
 409     (*KeywordMap)["uimage2DArray"] =           UIMAGE2DARRAY;
 410     (*KeywordMap)["imageCubeArray"] =          IMAGECUBEARRAY;
 411     (*KeywordMap)["iimageCubeArray"] =         IIMAGECUBEARRAY;
 412     (*KeywordMap)["uimageCubeArray"] =         UIMAGECUBEARRAY;
 413     (*KeywordMap)["image2DMS"] =               IMAGE2DMS;
 414     (*KeywordMap)["iimage2DMS"] =              IIMAGE2DMS;
 415     (*KeywordMap)["uimage2DMS"] =              UIMAGE2DMS;
 416     (*KeywordMap)["image2DMSArray"] =          IMAGE2DMSARRAY;
 417     (*KeywordMap)["iimage2DMSArray"] =         IIMAGE2DMSARRAY;
 418     (*KeywordMap)["uimage2DMSArray"] =         UIMAGE2DMSARRAY;
 419     (*KeywordMap)["double"] =                  DOUBLE;
 420     (*KeywordMap)["dvec2"] =                   DVEC2;
 421     (*KeywordMap)["dvec3"] =                   DVEC3;
 422     (*KeywordMap)["dvec4"] =                   DVEC4;
 423     (*KeywordMap)["samplerCubeArray"] =        SAMPLERCUBEARRAY;
 424     (*KeywordMap)["samplerCubeArrayShadow"] =  SAMPLERCUBEARRAYSHADOW;
 425     (*KeywordMap)["isamplerCubeArray"] =       ISAMPLERCUBEARRAY;
 426     (*KeywordMap)["usamplerCubeArray"] =       USAMPLERCUBEARRAY;
 427     (*KeywordMap)["sampler1DArrayShadow"] =    SAMPLER1DARRAYSHADOW;
 428     (*KeywordMap)["isampler1DArray"] =         ISAMPLER1DARRAY;
 429     (*KeywordMap)["usampler1D"] =              USAMPLER1D;
 430     (*KeywordMap)["isampler1D"] =              ISAMPLER1D;
 431     (*KeywordMap)["usampler1DArray"] =         USAMPLER1DARRAY;
 432     (*KeywordMap)["samplerBuffer"] =           SAMPLERBUFFER;
 433     (*KeywordMap)["uint"] =                    UINT;
 434     (*KeywordMap)["uvec2"] =                   UVEC2;
 435     (*KeywordMap)["uvec3"] =                   UVEC3;
 436     (*KeywordMap)["uvec4"] =                   UVEC4;
 437     (*KeywordMap)["samplerCubeShadow"] =       SAMPLERCUBESHADOW;
 438     (*KeywordMap)["sampler2DArray"] =          SAMPLER2DARRAY;
 439     (*KeywordMap)["sampler2DArrayShadow"] =    SAMPLER2DARRAYSHADOW;
 440     (*KeywordMap)["isampler2D"] =              ISAMPLER2D;
 441     (*KeywordMap)["isampler3D"] =              ISAMPLER3D;
 442     (*KeywordMap)["isamplerCube"] =            ISAMPLERCUBE;
 443     (*KeywordMap)["isampler2DArray"] =         ISAMPLER2DARRAY;
 444     (*KeywordMap)["usampler2D"] =              USAMPLER2D;
 445     (*KeywordMap)["usampler3D"] =              USAMPLER3D;
 446     (*KeywordMap)["usamplerCube"] =            USAMPLERCUBE;
 447     (*KeywordMap)["usampler2DArray"] =         USAMPLER2DARRAY;
 448     (*KeywordMap)["isampler2DRect"] =          ISAMPLER2DRECT;
 449     (*KeywordMap)["usampler2DRect"] =          USAMPLER2DRECT;
 450     (*KeywordMap)["isamplerBuffer"] =          ISAMPLERBUFFER;
 451     (*KeywordMap)["usamplerBuffer"] =          USAMPLERBUFFER;
 452     (*KeywordMap)["sampler2DMS"] =             SAMPLER2DMS;
 453     (*KeywordMap)["isampler2DMS"] =            ISAMPLER2DMS;
 454     (*KeywordMap)["usampler2DMS"] =            USAMPLER2DMS;
 455     (*KeywordMap)["sampler2DMSArray"] =        SAMPLER2DMSARRAY;
 456     (*KeywordMap)["isampler2DMSArray"] =       ISAMPLER2DMSARRAY;
 457     (*KeywordMap)["usampler2DMSArray"] =       USAMPLER2DMSARRAY;
 458     (*KeywordMap)["sampler1D"] =               SAMPLER1D;
 459     (*KeywordMap)["sampler1DShadow"] =         SAMPLER1DSHADOW;
 460     (*KeywordMap)["sampler3D"] =               SAMPLER3D;
 461     (*KeywordMap)["sampler2DShadow"] =         SAMPLER2DSHADOW;
 462     (*KeywordMap)["sampler2DRect"] =           SAMPLER2DRECT;
 463     (*KeywordMap)["sampler2DRectShadow"] =     SAMPLER2DRECTSHADOW;
 464     (*KeywordMap)["sampler1DArray"] =          SAMPLER1DARRAY;
 465     (*KeywordMap)["samplerExternalOES"] =      SAMPLEREXTERNALOES; // GL_OES_EGL_image_external
 466     (*KeywordMap)["noperspective"] =           NOPERSPECTIVE;
 467     (*KeywordMap)["smooth"] =                  SMOOTH;
 468     (*KeywordMap)["flat"] =                    FLAT;
 469     (*KeywordMap)["centroid"] =                CENTROID;
 470     (*KeywordMap)["precise"] =                 PRECISE;
 471     (*KeywordMap)["invariant"] =               INVARIANT;
 472     (*KeywordMap)["packed"] =                  PACKED;
 473     (*KeywordMap)["resource"] =                RESOURCE;
 474     (*KeywordMap)["superp"] =                  SUPERP;
 475
 476     ReservedSet = new std::set<std::string>;
 477
 478     ReservedSet->insert("common");
 479     ReservedSet->insert("partition");
 480     ReservedSet->insert("active");
 481     ReservedSet->insert("asm");
 482     ReservedSet->insert("class");
 483     ReservedSet->insert("union");
 484     ReservedSet->insert("enum");
 485     ReservedSet->insert("typedef");
 486     ReservedSet->insert("template");
 487     ReservedSet->insert("this");
 488     ReservedSet->insert("goto");
 489     ReservedSet->insert("inline");
 490     ReservedSet->insert("noinline");
 491     ReservedSet->insert("public");
 492     ReservedSet->insert("static");
 493     ReservedSet->insert("extern");
 494     ReservedSet->insert("external");
 495     ReservedSet->insert("interface");
 496     ReservedSet->insert("long");
 497     ReservedSet->insert("short");
 498     ReservedSet->insert("half");
 499     ReservedSet->insert("fixed");
 500     ReservedSet->insert("unsigned");
 501     ReservedSet->insert("input");
 502     ReservedSet->insert("output");
 503     ReservedSet->insert("hvec2");
 504     ReservedSet->insert("hvec3");
 505     ReservedSet->insert("hvec4");
 506     ReservedSet->insert("fvec2");
 507     ReservedSet->insert("fvec3");
 508     ReservedSet->insert("fvec4");
 509     ReservedSet->insert("sampler3DRect");
 510     ReservedSet->insert("filter");
 511     ReservedSet->insert("sizeof");
 512     ReservedSet->insert("cast");
 513     ReservedSet->insert("namespace");
 514     ReservedSet->insert("using");
 515 }
 516
 517 int TScanContext::tokenize(TPpContext* pp, TParserToken& token)
 518 {
 519     do {
 520         parserToken = &token;
 521         TPpToken ppToken;
 522         tokenText = pp->tokenize(&ppToken);
 523         if (tokenText == 0)
 524             return 0;
 525
 526         loc = ppToken.loc;
 527         parserToken->sType.lex.loc = loc;
 528         switch (ppToken.token) {
 529         case ';':  afterType = false;   return SEMICOLON;
 530         case ',':  afterType = false;   return COMMA;
 531         case ':':                       return COLON;
 532         case '=':  afterType = false;   return EQUAL;
 533         case '(':  afterType = false;   return LEFT_PAREN;
 534         case ')':  afterType = false;   return RIGHT_PAREN;
 535         case '.':  field = true;        return DOT;
 536         case '!':                       return BANG;
 537         case '-':                       return DASH;
 538         case '~':                       return TILDE;
 539         case '+':                       return PLUS;
 540         case '*':                       return STAR;
 541         case '/':                       return SLASH;
 542         case '%':                       return PERCENT;
 543         case '<':                       return LEFT_ANGLE;
 544         case '>':                       return RIGHT_ANGLE;
 545         case '|':                       return VERTICAL_BAR;
 546         case '^':                       return CARET;
 547         case '&':                       return AMPERSAND;
 548         case '?':                       return QUESTION;
 549         case '[':                       return LEFT_BRACKET;
 550         case ']':                       return RIGHT_BRACKET;
 551         case '{':                       return LEFT_BRACE;
 552         case '}':                       return RIGHT_BRACE;
 553         case '\\':
 554             parseContext.error(loc, "illegal use of escape character", "\\", "");
 555             break;
 556
 557         case CPP_AND_OP:                return AND_OP;
 558         case CPP_SUB_ASSIGN:            return SUB_ASSIGN;
 559         case CPP_MOD_ASSIGN:            return MOD_ASSIGN;
 560         case CPP_ADD_ASSIGN:            return ADD_ASSIGN;
 561         case CPP_DIV_ASSIGN:            return DIV_ASSIGN;
 562         case CPP_MUL_ASSIGN:            return MUL_ASSIGN;
 563         case CPP_EQ_OP:                 return EQ_OP;
 564         case CPP_XOR_OP:                return XOR_OP;
 565         case CPP_GE_OP:                 return GE_OP;
 566         case CPP_RIGHT_OP:              return RIGHT_OP;
 567         case CPP_LE_OP:                 return LE_OP;
 568         case CPP_LEFT_OP:               return LEFT_OP;
 569         case CPP_DEC_OP:                return DEC_OP;
 570         case CPP_NE_OP:                 return NE_OP;
 571         case CPP_OR_OP:                 return OR_OP;
 572         case CPP_INC_OP:                return INC_OP;
 573         case CPP_RIGHT_ASSIGN:          return RIGHT_ASSIGN;
 574         case CPP_LEFT_ASSIGN:           return LEFT_ASSIGN;
 575         case CPP_AND_ASSIGN:            return AND_ASSIGN;
 576         case CPP_OR_ASSIGN:             return OR_ASSIGN;
 577         case CPP_XOR_ASSIGN:            return XOR_ASSIGN;
 578
 579         case CPP_INTCONSTANT:           parserToken->sType.lex.i = ppToken.ival;       return INTCONSTANT;
 580         case CPP_UINTCONSTANT:          parserToken->sType.lex.i = ppToken.ival;       return UINTCONSTANT;
 581         case CPP_FLOATCONSTANT:         parserToken->sType.lex.d = ppToken.dval;       return FLOATCONSTANT;
 582         case CPP_DOUBLECONSTANT:        parserToken->sType.lex.d = ppToken.dval;       return DOUBLECONSTANT;
 583         case CPP_IDENTIFIER:            return tokenizeIdentifier();
 584
 585         case EOF:                       return 0;
 586
 587         default:
 588             char buf[2];
 589             buf[0] = ppToken.token;
 590             buf[1] = 0;
 591             parseContext.error(loc, "unexpected token", buf, "");
 592             break;
 593         }
 594     } while (true);
 595 }
 596
 597 int TScanContext::tokenizeIdentifier()
 598 {
 599     if (ReservedSet->find(tokenText) != ReservedSet->end())
 600         return reservedWord();
 601
 602     std::map<std::string, int>::const_iterator it = KeywordMap->find(tokenText);
 603     if (it == KeywordMap->end()) {
 604         // Should have an identifier of some sort
 605         return identifierOrType();
 606     }
 607     keyword = it->second;
 608     field = false;
 609
 610     switch (keyword) {
 611     case CONST:
 612     case UNIFORM:
 613     case IN:
 614     case OUT:
 615     case INOUT:
 616     case STRUCT:
 617     case BREAK:
 618     case CONTINUE:
 619     case DO:
 620     case FOR:
 621     case WHILE:
 622     case IF:
 623     case ELSE:
 624     case DISCARD:
 625     case RETURN:
 626     case CASE:
 627         return keyword;
 628
 629     case SWITCH:
 630     case DEFAULT:
 631         if ((parseContext.profile == EEsProfile && parseContext.version < 300) ||
 632             (parseContext.profile != EEsProfile && parseContext.version < 130))
 633             reservedWord();
 634         return keyword;
 635
 636     case VOID:
 637     case BOOL:
 638     case FLOAT:
 639     case INT:
 640     case BVEC2:
 641     case BVEC3:
 642     case BVEC4:
 643     case VEC2:
 644     case VEC3:
 645     case VEC4:
 646     case IVEC2:
 647     case IVEC3:
 648     case IVEC4:
 649     case MAT2:
 650     case MAT3:
 651     case MAT4:
 652     case SAMPLER2D:
 653     case SAMPLERCUBE:
 654         afterType = true;
 655         return keyword;
 656
 657     case BOOLCONSTANT:
 658         if (strcmp("true", tokenText) == 0)
 659             parserToken->sType.lex.b = true;
 660         else
 661             parserToken->sType.lex.b = false;
 662         return keyword;
 663
 664     case ATTRIBUTE:
 665     case VARYING:
 666         if (parseContext.profile == EEsProfile && parseContext.version >= 300)
 667             reservedWord();
 668         return keyword;
 669
 670     case BUFFER:
 671         if (parseContext.version < 430)
 672             return identifierOrType();
 673         return keyword;
 674
 675     case ATOMIC_UINT:
 676         return es30ReservedFromGLSL(420);
 677
 678     case COHERENT:
 679     case RESTRICT:
 680     case READONLY:
 681     case WRITEONLY:
 682         return es30ReservedFromGLSL(parseContext.extensionsTurnedOn(1, &GL_ARB_shader_image_load_store) ? 130 : 420);
 683
 684     case VOLATILE:
 685         if (! parseContext.symbolTable.atBuiltInLevel() && (parseContext.profile == EEsProfile || (parseContext.version < 420 && ! parseContext.extensionsTurnedOn(1, &GL_ARB_shader_image_load_store))))
 686             reservedWord();
 687         return keyword;
 688
 689     case LAYOUT:
 690         if ((parseContext.profile == EEsProfile && parseContext.version < 300) ||
 691             (parseContext.profile != EEsProfile && parseContext.version < 140 &&
 692             ! parseContext.extensionsTurnedOn(1, &GL_ARB_shading_language_420pack)))
 693             return identifierOrType();
 694         return keyword;
 695
 696     case SHARED:
 697         if ((parseContext.profile == EEsProfile && parseContext.version < 300) ||
 698             (parseContext.profile != EEsProfile && parseContext.version < 140))
 699             return identifierOrType();
 700         return keyword;
 701
 702     case PATCH:
 703         if (parseContext.symbolTable.atBuiltInLevel() || parseContext.extensionsTurnedOn(1, &GL_ARB_tessellation_shader))
 704             return es30ReservedFromGLSL(150);
 705         else
 706             return es30ReservedFromGLSL(400);
 707
 708     case SAMPLE:
 709     case SUBROUTINE:
 710         return es30ReservedFromGLSL(400);
 711
 712     case HIGH_PRECISION:
 713     case MEDIUM_PRECISION:
 714     case LOW_PRECISION:
 715     case PRECISION:
 716         return precisionKeyword();
 717
 718     case MAT2X2:
 719     case MAT2X3:
 720     case MAT2X4:
 721     case MAT3X2:
 722     case MAT3X3:
 723     case MAT3X4:
 724     case MAT4X2:
 725     case MAT4X3:
 726     case MAT4X4:
 727         return matNxM();
 728
 729     case DMAT2:
 730     case DMAT3:
 731     case DMAT4:
 732     case DMAT2X2:
 733     case DMAT2X3:
 734     case DMAT2X4:
 735     case DMAT3X2:
 736     case DMAT3X3:
 737     case DMAT3X4:
 738     case DMAT4X2:
 739     case DMAT4X3:
 740     case DMAT4X4:
 741         return dMat();
 742
 743     case IMAGE1D:
 744     case IIMAGE1D:
 745     case UIMAGE1D:
 746     case IMAGE2D:
 747     case IIMAGE2D:
 748     case UIMAGE2D:
 749     case IMAGE3D:
 750     case IIMAGE3D:
 751     case UIMAGE3D:
 752     case IMAGE2DRECT:
 753     case IIMAGE2DRECT:
 754     case UIMAGE2DRECT:
 755     case IMAGECUBE:
 756     case IIMAGECUBE:
 757     case UIMAGECUBE:
 758     case IMAGEBUFFER:
 759     case IIMAGEBUFFER:
 760     case UIMAGEBUFFER:
 761     case IMAGE1DARRAY:
 762     case IIMAGE1DARRAY:
 763     case UIMAGE1DARRAY:
 764     case IMAGE2DARRAY:
 765     case IIMAGE2DARRAY:
 766     case UIMAGE2DARRAY:
 767         return firstGenerationImage();
 768
 769     case IMAGECUBEARRAY:
 770     case IIMAGECUBEARRAY:
 771     case UIMAGECUBEARRAY:
 772     case IMAGE2DMS:
 773     case IIMAGE2DMS:
 774     case UIMAGE2DMS:
 775     case IMAGE2DMSARRAY:
 776     case IIMAGE2DMSARRAY:
 777     case UIMAGE2DMSARRAY:
 778         return secondGenerationImage();
 779
 780     case DOUBLE:
 781     case DVEC2:
 782     case DVEC3:
 783     case DVEC4:
 784         afterType = true;
 785         if (parseContext.profile == EEsProfile || parseContext.version < 400)
 786             reservedWord();
 787         return keyword;
 788
 789     case SAMPLERCUBEARRAY:
 790     case SAMPLERCUBEARRAYSHADOW:
 791     case ISAMPLERCUBEARRAY:
 792     case USAMPLERCUBEARRAY:
 793         afterType = true;
 794         if (parseContext.profile == EEsProfile || (parseContext.version < 400 && ! parseContext.extensionsTurnedOn(1, &GL_ARB_texture_cube_map_array)))
 795             reservedWord();
 796         return keyword;
 797
 798     case ISAMPLER1D:
 799     case ISAMPLER1DARRAY:
 800     case SAMPLER1DARRAYSHADOW:
 801     case USAMPLER1D:
 802     case USAMPLER1DARRAY:
 803     case SAMPLERBUFFER:
 804         afterType = true;
 805         return es30ReservedFromGLSL(130);
 806
 807     case UINT:
 808     case UVEC2:
 809     case UVEC3:
 810     case UVEC4:
 811     case SAMPLERCUBESHADOW:
 812     case SAMPLER2DARRAY:
 813     case SAMPLER2DARRAYSHADOW:
 814     case ISAMPLER2D:
 815     case ISAMPLER3D:
 816     case ISAMPLERCUBE:
 817     case ISAMPLER2DARRAY:
 818     case USAMPLER2D:
 819     case USAMPLER3D:
 820     case USAMPLERCUBE:
 821     case USAMPLER2DARRAY:
 822         afterType = true;
 823         return nonreservedKeyword(300, 130);
 824
 825     case ISAMPLER2DRECT:
 826     case USAMPLER2DRECT:
 827     case ISAMPLERBUFFER:
 828     case USAMPLERBUFFER:
 829         afterType = true;
 830         return es30ReservedFromGLSL(140);
 831
 832     case SAMPLER2DMS:
 833     case ISAMPLER2DMS:
 834     case USAMPLER2DMS:
 835     case SAMPLER2DMSARRAY:
 836     case ISAMPLER2DMSARRAY:
 837     case USAMPLER2DMSARRAY:
 838         afterType = true;
 839         return es30ReservedFromGLSL(150);
 840
 841     case SAMPLER1D:
 842     case SAMPLER1DSHADOW:
 843         afterType = true;
 844         if (parseContext.profile == EEsProfile)
 845             reservedWord();
 846         return keyword;
 847
 848     case SAMPLER3D:
 849         afterType = true;
 850         if (parseContext.profile == EEsProfile && parseContext.version < 300) {
 851             if (! parseContext.extensionsTurnedOn(1, &GL_OES_texture_3D))
 852                 reservedWord();
 853         }
 854         return keyword;
 855
 856     case SAMPLER2DSHADOW:
 857         afterType = true;
 858         if (parseContext.profile == EEsProfile && parseContext.version < 300)
 859             reservedWord();
 860         return keyword;
 861
 862     case SAMPLER2DRECT:
 863     case SAMPLER2DRECTSHADOW:
 864         afterType = true;
 865         if (parseContext.profile == EEsProfile)
 866             reservedWord();
 867         else if (parseContext.version < 140 && ! parseContext.symbolTable.atBuiltInLevel() && ! parseContext.extensionsTurnedOn(1, &GL_ARB_texture_rectangle)) {
 868             if (parseContext.messages & EShMsgRelaxedErrors)
 869                 parseContext.requireExtensions(loc, 1, &GL_ARB_texture_rectangle, "texture-rectangle sampler keyword");
 870             else
 871                 reservedWord();
 872         }
 873         return keyword;
 874
 875     case SAMPLER1DARRAY:
 876         afterType = true;
 877         if (parseContext.profile == EEsProfile && parseContext.version == 300)
 878             reservedWord();
 879         else if ((parseContext.profile == EEsProfile && parseContext.version < 300) ||
 880                  (parseContext.profile != EEsProfile && parseContext.version < 130))
 881             return identifierOrType();
 882         return keyword;
 883
 884     case SAMPLEREXTERNALOES:
 885         afterType = true;
 886         if (parseContext.symbolTable.atBuiltInLevel() || parseContext.extensionsTurnedOn(1, &GL_OES_EGL_image_external))
 887             return keyword;
 888         return identifierOrType();
 889
 890     case NOPERSPECTIVE:
 891         return es30ReservedFromGLSL(130);
 892
 893     case SMOOTH:
 894         if ((parseContext.profile == EEsProfile && parseContext.version < 300) ||
 895             (parseContext.profile != EEsProfile && parseContext.version < 130))
 896             return identifierOrType();
 897         return keyword;
 898
 899     case FLAT:
 900         if (parseContext.profile == EEsProfile && parseContext.version < 300)
 901             reservedWord();
 902         else if (parseContext.profile != EEsProfile && parseContext.version < 130)
 903             return identifierOrType();
 904         return keyword;
 905
 906     case CENTROID:
 907         if (parseContext.version < 120)
 908             return identifierOrType();
 909         return keyword;
 910
 911     case PRECISE:
 912         if (parseContext.profile == EEsProfile ||
 913             (parseContext.profile != EEsProfile && parseContext.version < 400))
 914             return identifierOrType();
 915         return keyword;
 916
 917     case INVARIANT:
 918         if (parseContext.profile != EEsProfile && parseContext.version < 120)
 919             return identifierOrType();
 920         return keyword;
 921
 922     case PACKED:
 923         if ((parseContext.profile == EEsProfile && parseContext.version < 300) ||
 924             (parseContext.profile != EEsProfile && parseContext.version < 330))
 925             return reservedWord();
 926         return identifierOrType();
 927
 928     case RESOURCE:
 929     {
 930         bool reserved = (parseContext.profile == EEsProfile && parseContext.version >= 300) ||
 931                         (parseContext.profile != EEsProfile && parseContext.version >= 420);
 932         return identifierOrReserved(reserved);
 933     }
 934     case SUPERP:
 935     {
 936         bool reserved = parseContext.profile == EEsProfile || parseContext.version >= 130;
 937         return identifierOrReserved(reserved);
 938     }
 939
 940     default:
 941         parseContext.infoSink.info.message(EPrefixInternalError, "Unknown glslang keyword", loc);
 942         return 0;
 943     }
 944 }
 945
 946 int TScanContext::identifierOrType()
 947 {
 948     parserToken->sType.lex.string = NewPoolTString(tokenText);
 949     if (field) {
 950         field = false;
 951
 952         return FIELD_SELECTION;
 953     }
 954
 955     parserToken->sType.lex.symbol = parseContext.symbolTable.find(*parserToken->sType.lex.string);
 956     if (afterType == false && parserToken->sType.lex.symbol) {
 957         if (const TVariable* variable = parserToken->sType.lex.symbol->getAsVariable()) {
 958             if (variable->isUserType()) {
 959                 afterType = true;
 960
 961                 return TYPE_NAME;
 962             }
 963         }
 964     }
 965
 966     return IDENTIFIER;
 967 }
 968
 969 // Give an error for use of a reserved symbol.
 970 // However, allow built-in declarations to use reserved words, to allow
 971 // extension support before the extension is enabled.
 972 int TScanContext::reservedWord()
 973 {
 974     if (! parseContext.symbolTable.atBuiltInLevel())
 975         parseContext.error(loc, "Reserved word.", tokenText, "", "");
 976
 977     return 0;
 978 }
 979
 980 int TScanContext::identifierOrReserved(bool reserved)
 981 {
 982     if (reserved) {
 983         reservedWord();
 984
 985         return 0;
 986     }
 987
 988     if (parseContext.forwardCompatible)
 989         parseContext.warn(loc, "using future reserved keyword", tokenText, "");
 990
 991     return identifierOrType();
 992 }
 993
 994 // For keywords that suddenly showed up on non-ES (not previously reserved)
 995 // but then got reserved by ES 3.0.
 996 int TScanContext::es30ReservedFromGLSL(int version)
 997 {
 998     if (parseContext.symbolTable.atBuiltInLevel())
 999         return keyword;
1000
1001     if ((parseContext.profile == EEsProfile && parseContext.version < 300) ||
1002         (parseContext.profile != EEsProfile && parseContext.version < version)) {
1003             if (parseContext.forwardCompatible)
1004                 parseContext.warn(loc, "future reserved word in ES 300 and keyword in GLSL", tokenText, "");
1005
1006             return identifierOrType();
1007     } else if (parseContext.profile == EEsProfile && parseContext.version >= 300)
1008         reservedWord();
1009
1010     return keyword;
1011 }
1012
1013 // For a keyword that was never reserved, until it suddenly
1014 // showed up, both in an es version and a non-ES version.
1015 int TScanContext::nonreservedKeyword(int esVersion, int nonEsVersion)
1016 {
1017     if ((parseContext.profile == EEsProfile && parseContext.version < esVersion) ||
1018         (parseContext.profile != EEsProfile && parseContext.version < nonEsVersion)) {
1019         if (parseContext.forwardCompatible)
1020             parseContext.warn(loc, "using future keyword", tokenText, "");
1021
1022         return identifierOrType();
1023     }
1024
1025     return keyword;
1026 }
1027
1028 int TScanContext::precisionKeyword()
1029 {
1030     if (parseContext.profile == EEsProfile || parseContext.version >= 130)
1031         return keyword;
1032
1033     if (parseContext.forwardCompatible)
1034         parseContext.warn(loc, "using ES precision qualifier keyword", tokenText, "");
1035
1036     return identifierOrType();
1037 }
1038
1039 int TScanContext::matNxM()
1040 {
1041     afterType = true;
1042
1043     if (parseContext.version > 110)
1044         return keyword;
1045
1046     if (parseContext.forwardCompatible)
1047         parseContext.warn(loc, "using future non-square matrix type keyword", tokenText, "");
1048
1049     return identifierOrType();
1050 }
1051
1052 int TScanContext::dMat()
1053 {
1054     afterType = true;
1055
1056     if (parseContext.profile == EEsProfile && parseContext.version >= 300) {
1057         reservedWord();
1058
1059         return keyword;
1060     }
1061
1062     if (parseContext.profile != EEsProfile && parseContext.version >= 400)
1063         return keyword;
1064
1065     if (parseContext.forwardCompatible)
1066         parseContext.warn(loc, "using future type keyword", tokenText, "");
1067
1068     return identifierOrType();
1069 }
1070
1071 int TScanContext::firstGenerationImage()
1072 {
1073     afterType = true;
1074
1075     if (parseContext.symbolTable.atBuiltInLevel() || (parseContext.profile != EEsProfile && (parseContext.version >= 420 || parseContext.extensionsTurnedOn(1, &GL_ARB_shader_image_load_store))))
1076         return keyword;
1077
1078     if ((parseContext.profile == EEsProfile && parseContext.version >= 300) ||
1079         (parseContext.profile != EEsProfile && parseContext.version >= 130)) {
1080         reservedWord();
1081
1082         return keyword;
1083     }
1084
1085     if (parseContext.forwardCompatible)
1086         parseContext.warn(loc, "using future type keyword", tokenText, "");
1087
1088     return identifierOrType();
1089 }
1090
1091 int TScanContext::secondGenerationImage()
1092 {
1093     afterType = true;
1094
1095     if (parseContext.symbolTable.atBuiltInLevel() || parseContext.profile != EEsProfile && (parseContext.version >= 420 || parseContext.extensionsTurnedOn(1, &GL_ARB_shader_image_load_store)))
1096         return keyword;
1097
1098     if (parseContext.forwardCompatible)
1099         parseContext.warn(loc, "using future type keyword", tokenText, "");
1100
1101     return identifierOrType();
1102 }
1103
1104 } // end namespace glslang