kc3-lang/angle/src/compiler/translator/glslang.y

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• Hash : 255dc673
  Author :
  Date : 2025-10-09T00:17:59
  

  Translator: Validate ESSL 100 limitations during parse
  
  Validating the shape of the for loop as specifically required by WebGL
  (per ESSL 100 spec, Appendix A) is more easily done during parse, where
  the shape of the input GLSL is exactly known.
  
  Bug: angleproject:349994211
  Change-Id: I05a9b1b6915dbc1f6c74bb9159f6cc85fefc7b67
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/7022355
  Reviewed-by: Yuxin Hu <yuxinhu@google.com>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/compiler/translator/glslang.y

• /*
  //
  // Copyright 2002 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  This file contains the Yacc grammar for GLSL ES.
  Based on ANSI C Yacc grammar:
  http://www.lysator.liu.se/c/ANSI-C-grammar-y.html
  
  IF YOU MODIFY THIS FILE YOU ALSO NEED TO RUN scripts/run_code_generation.py
  WHICH GENERATES THE GLSL ES PARSER (glslang_tab_autogen.cpp AND glslang_tab_autogen.h).
  */
  
  %{
  // GENERATED FILE - DO NOT EDIT.
  // Generated by generate_parser.py from glslang.y
  //
  // Copyright 2019 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // glslang.y:
  //   Parser for the OpenGL shading language.
  
  // Ignore errors in auto-generated code.
  #if defined(__GNUC__)
  #pragma GCC diagnostic ignored "-Wunused-function"
  #pragma GCC diagnostic ignored "-Wunused-variable"
  #pragma GCC diagnostic ignored "-Wswitch-enum"
  #elif defined(_MSC_VER)
  #pragma warning(disable: 4065)
  #pragma warning(disable: 4189)
  #pragma warning(disable: 4244)
  #pragma warning(disable: 4505)
  #pragma warning(disable: 4701)
  #pragma warning(disable: 4702)
  #endif
  #if defined(__clang__)
  #pragma clang diagnostic ignored "-Wunreachable-code"
  #pragma clang diagnostic ignored "-Wunused-but-set-variable"
  #endif
  
  #include "angle_gl.h"
  #include "compiler/translator/Declarator.h"
  #include "compiler/translator/SymbolTable.h"
  #include "compiler/translator/ParseContext.h"
  #include "GLSLANG/ShaderLang.h"
  
  #define YYENABLE_NLS 0
  
  using namespace sh;
  
  %}
  %expect 1 /* One shift reduce conflict because of if | else */
  %parse-param {TParseContext* context}
  %param   {void *scanner}
  %define api.pure full
  %locations
  
  %code requires {
  #define YYLTYPE TSourceLoc
  #define YYLTYPE_IS_DECLARED 1
  #define YYLTYPE_IS_TRIVIAL 1
  }
  
  %union {
      struct {
          union {
              const char *string;  // pool allocated.
              float f;
              int i;
              unsigned int u;
              bool b;
          };
          const TSymbol* symbol;
      } lex;
      struct {
          TOperator op;
          union {
              TIntermNode *intermNode;
              TIntermNodePair nodePair;
              TIntermTyped *intermTypedNode;
              TIntermAggregate *intermAggregate;
              TIntermBlock *intermBlock;
              TIntermDeclaration *intermDeclaration;
              TIntermFunctionPrototype *intermFunctionPrototype;
              TIntermSwitch *intermSwitch;
              TIntermCase *intermCase;
          };
          union {
              TVector<unsigned int> *arraySizes;
              TTypeSpecifierNonArray typeSpecifierNonArray;
              TPublicType type;
              TPrecision precision;
              TLayoutQualifier layoutQualifier;
              TQualifier qualifier;
              TFunction *function;
              TFunctionLookup *functionLookup;
              TParameter param;
              TDeclarator *declarator;
              TDeclaratorList *declaratorList;
              TFieldList *fieldList;
              TQualifierWrapperBase *qualifierWrapper;
              TTypeQualifierBuilder *typeQualifierBuilder;
          };
      } interm;
  }
  
  %{
  extern int yylex(YYSTYPE* yylval, YYLTYPE* yylloc, void* yyscanner);
  extern void yyerror(YYLTYPE* yylloc, TParseContext* context, void *scanner, const char* reason);
  
  #define YYLLOC_DEFAULT(Current, Rhs, N)                      \
    do {                                                       \
        if (N) {                                         \
          (Current).first_file = YYRHSLOC(Rhs, 1).first_file;  \
          (Current).first_line = YYRHSLOC(Rhs, 1).first_line;  \
          (Current).last_file = YYRHSLOC(Rhs, N).last_file;    \
          (Current).last_line = YYRHSLOC(Rhs, N).last_line;    \
        }                                                      \
        else {                                                 \
          (Current).first_file = YYRHSLOC(Rhs, 0).last_file;   \
          (Current).first_line = YYRHSLOC(Rhs, 0).last_line;   \
          (Current).last_file = YYRHSLOC(Rhs, 0).last_file;    \
          (Current).last_line = YYRHSLOC(Rhs, 0).last_line;    \
        }                                                      \
    } while (0)
  
  #define VERTEX_ONLY(S, L) do {  \
      if (context->getShaderType() != GL_VERTEX_SHADER) {  \
          context->error(L, " supported in vertex shaders only", S);  \
      }  \
  } while (0)
  
  #define COMPUTE_ONLY(S, L) do {  \
      if (context->getShaderType() != GL_COMPUTE_SHADER) {  \
          context->error(L, " supported in compute shaders only", S);  \
      }  \
  } while (0)
  
  #define ES2_ONLY(S, L) do {  \
      if (context->getShaderVersion() != 100) {  \
          context->error(L, " supported in GLSL ES 1.00 only", S);  \
      }  \
  } while (0)
  
  #define ES3_OR_NEWER(TOKEN, LINE, REASON) do {  \
      if (context->getShaderVersion() < 300) {  \
          context->error(LINE, REASON " supported in GLSL ES 3.00 and above only", TOKEN);  \
      }  \
  } while (0)
  
  #define ES3_1_OR_NEWER(TOKEN, LINE, REASON) do {  \
      if (context->getShaderVersion() < 310) {  \
          context->error(LINE, REASON " supported in GLSL ES 3.10 and above only", TOKEN);  \
      }  \
  } while (0)
  %}
  
  %token <lex> INVARIANT PRECISE HIGH_PRECISION MEDIUM_PRECISION LOW_PRECISION PRECISION
  %token <lex> ATTRIBUTE CONST_QUAL BOOL_TYPE FLOAT_TYPE INT_TYPE UINT_TYPE
  %token <lex> BREAK CONTINUE DO ELSE FOR IF DISCARD RETURN SWITCH CASE DEFAULT
  %token <lex> BVEC2 BVEC3 BVEC4 IVEC2 IVEC3 IVEC4 VEC2 VEC3 VEC4 UVEC2 UVEC3 UVEC4
  %token <lex> MATRIX2 MATRIX3 MATRIX4 IN_QUAL OUT_QUAL INOUT_QUAL UNIFORM BUFFER VARYING
  %token <lex> MATRIX2x3 MATRIX3x2 MATRIX2x4 MATRIX4x2 MATRIX3x4 MATRIX4x3
  %token <lex> SAMPLE CENTROID FLAT SMOOTH NOPERSPECTIVE PATCH
  %token <lex> READONLY WRITEONLY COHERENT RESTRICT VOLATILE SHARED
  %token <lex> STRUCT VOID_TYPE WHILE
  %token <lex> SAMPLER2D SAMPLERCUBE SAMPLER_EXTERNAL_OES SAMPLER2DRECT SAMPLER2DARRAY
  %token <lex> ISAMPLER2D ISAMPLER3D ISAMPLERCUBE ISAMPLER2DARRAY
  %token <lex> USAMPLER2D USAMPLER3D USAMPLERCUBE USAMPLER2DARRAY
  %token <lex> SAMPLER2DMS ISAMPLER2DMS USAMPLER2DMS
  %token <lex> SAMPLER2DMSARRAY ISAMPLER2DMSARRAY USAMPLER2DMSARRAY
  %token <lex> SAMPLER3D SAMPLER3DRECT SAMPLER2DSHADOW SAMPLERCUBESHADOW SAMPLER2DARRAYSHADOW SAMPLERVIDEOWEBGL
  %token <lex> SAMPLERCUBEARRAYOES SAMPLERCUBEARRAYSHADOWOES ISAMPLERCUBEARRAYOES USAMPLERCUBEARRAYOES
  %token <lex> SAMPLERCUBEARRAYEXT SAMPLERCUBEARRAYSHADOWEXT ISAMPLERCUBEARRAYEXT USAMPLERCUBEARRAYEXT
  %token <lex> SAMPLERBUFFER ISAMPLERBUFFER USAMPLERBUFFER
  %token <lex> SAMPLEREXTERNAL2DY2YEXT
  %token <lex> IMAGE2D IIMAGE2D UIMAGE2D IMAGE3D IIMAGE3D UIMAGE3D IMAGE2DARRAY IIMAGE2DARRAY UIMAGE2DARRAY
  %token <lex> IMAGECUBE IIMAGECUBE UIMAGECUBE
  %token <lex> IMAGECUBEARRAYOES IIMAGECUBEARRAYOES UIMAGECUBEARRAYOES
  %token <lex> IMAGECUBEARRAYEXT IIMAGECUBEARRAYEXT UIMAGECUBEARRAYEXT
  %token <lex> IMAGEBUFFER IIMAGEBUFFER UIMAGEBUFFER
  %token <lex> ATOMICUINT
  %token <lex> PIXELLOCALANGLE IPIXELLOCALANGLE UPIXELLOCALANGLE
  %token <lex> LAYOUT
  %token <lex> YUVCSCSTANDARDEXT YUVCSCSTANDARDEXTCONSTANT
  
  %token <lex> IDENTIFIER TYPE_NAME FLOATCONSTANT INTCONSTANT UINTCONSTANT BOOLCONSTANT
  %token <lex> FIELD_SELECTION
  %token <lex> LEFT_OP RIGHT_OP
  %token <lex> INC_OP DEC_OP LE_OP GE_OP EQ_OP NE_OP
  %token <lex> AND_OP OR_OP XOR_OP MUL_ASSIGN DIV_ASSIGN ADD_ASSIGN
  %token <lex> MOD_ASSIGN LEFT_ASSIGN RIGHT_ASSIGN AND_ASSIGN XOR_ASSIGN OR_ASSIGN
  %token <lex> SUB_ASSIGN
  
  %token <lex> LEFT_PAREN RIGHT_PAREN LEFT_BRACKET RIGHT_BRACKET LEFT_BRACE RIGHT_BRACE DOT
  %token <lex> COMMA COLON EQUAL SEMICOLON BANG DASH TILDE PLUS STAR SLASH PERCENT
  %token <lex> LEFT_ANGLE RIGHT_ANGLE VERTICAL_BAR CARET AMPERSAND QUESTION
  
  %type <lex> identifier
  %type <interm.op> assignment_operator unary_operator
  %type <interm.intermTypedNode> variable_identifier primary_expression postfix_expression
  %type <interm.intermTypedNode> expression integer_expression assignment_expression
  %type <interm.intermTypedNode> unary_expression multiplicative_expression additive_expression
  %type <interm.intermTypedNode> relational_expression equality_expression
  %type <interm.intermTypedNode> conditional_expression constant_expression
  %type <interm.intermTypedNode> logical_or_expression logical_xor_expression logical_and_expression
  %type <interm.intermTypedNode> shift_expression and_expression exclusive_or_expression inclusive_or_expression
  %type <interm.intermTypedNode> function_call initializer
  
  %type <interm.intermNode> condition conditionopt
  %type <interm.intermBlock> translation_unit
  %type <interm.intermNode> function_definition statement simple_statement
  %type <interm.intermBlock> statement_list compound_statement_with_scope compound_statement_no_new_scope
  %type <interm.intermNode> declaration_statement selection_statement expression_statement
  %type <interm.intermNode> declaration external_declaration
  %type <interm.intermNode> for_init_statement
  %type <interm.nodePair> selection_rest_statement for_rest_statement
  %type <interm.intermSwitch> switch_statement
  %type <interm.intermCase> case_label
  %type <interm.intermNode> iteration_statement jump_statement statement_no_new_scope statement_with_scope
  %type <interm> single_declaration init_declarator_list
  
  %type <interm.param> parameter_declaration parameter_declarator
  %type <interm.layoutQualifier> layout_qualifier_id_list layout_qualifier_id
  
  // Note: array_specifier guaranteed to be non-null.
  %type <interm.arraySizes> array_specifier
  
  %type <interm.type> fully_specified_type type_specifier parameter_type_specifier
  
  %type <interm.precision> precision_qualifier
  %type <interm.layoutQualifier> layout_qualifier
  %type <interm.qualifier> interpolation_qualifier
  %type <interm.qualifierWrapper> storage_qualifier single_type_qualifier invariant_qualifier precise_qualifier
  %type <interm.typeQualifierBuilder> type_qualifier
  
  %type <interm.typeSpecifierNonArray> type_specifier_nonarray struct_specifier
  %type <interm.type> type_specifier_no_prec
  %type <interm.declarator> struct_declarator
  %type <interm.declaratorList> struct_declarator_list
  %type <interm.fieldList> struct_declaration struct_declaration_list
  %type <interm.function> function_header function_declarator
  %type <interm.function> function_header_with_parameters
  %type <interm.functionLookup> function_identifier function_call_header
  %type <interm.functionLookup> function_call_header_with_parameters function_call_header_no_parameters
  %type <interm.functionLookup> function_call_generic function_call_or_method
  %type <interm> function_prototype
  
  %type <lex> enter_struct
  
  %start translation_unit
  %%
  
  identifier
      : IDENTIFIER
      | TYPE_NAME
  
  variable_identifier
      : IDENTIFIER {
          // The symbol table search was done in the lexical phase
          $$ = context->parseVariableIdentifier(@1, ImmutableString($1.string), $1.symbol);
      }
      ;
  
  primary_expression
      : variable_identifier {
          $$ = $1;
      }
      | INTCONSTANT {
          TConstantUnion *unionArray = new TConstantUnion[1];
          unionArray->setIConst($1.i);
          $$ = context->addScalarLiteral(unionArray, @1);
      }
      | UINTCONSTANT {
          TConstantUnion *unionArray = new TConstantUnion[1];
          unionArray->setUConst($1.u);
          $$ = context->addScalarLiteral(unionArray, @1);
      }
      | FLOATCONSTANT {
          TConstantUnion *unionArray = new TConstantUnion[1];
          unionArray->setFConst($1.f);
          $$ = context->addScalarLiteral(unionArray, @1);
      }
      | BOOLCONSTANT {
          TConstantUnion *unionArray = new TConstantUnion[1];
          unionArray->setBConst($1.b);
          $$ = context->addScalarLiteral(unionArray, @1);
      }
      | YUVCSCSTANDARDEXTCONSTANT {
          if (!context->checkCanUseExtension(@1, TExtension::EXT_YUV_target))
          {
             context->error(@1, "unsupported value", ImmutableString($1.string));
          }
          TConstantUnion *unionArray = new TConstantUnion[1];
          unionArray->setYuvCscStandardEXTConst(getYuvCscStandardEXT(ImmutableString($1.string)));
          $$ = context->addScalarLiteral(unionArray, @1);
      }
      | LEFT_PAREN expression RIGHT_PAREN {
          $$ = $2;
      }
      ;
  
  postfix_expression
      : primary_expression {
          $$ = $1;
      }
      | postfix_expression LEFT_BRACKET integer_expression RIGHT_BRACKET {
          $$ = context->addIndexExpression($1, @2, $3);
      }
      | function_call {
          $$ = $1;
      }
      | postfix_expression DOT FIELD_SELECTION {
          $$ = context->addFieldSelectionExpression($1, @2, ImmutableString($3.string), @3);
      }
      | postfix_expression INC_OP {
          $$ = context->addUnaryMathLValue(EOpPostIncrement, $1, @2);
      }
      | postfix_expression DEC_OP {
          $$ = context->addUnaryMathLValue(EOpPostDecrement, $1, @2);
      }
      ;
  
  integer_expression
      : expression {
          context->checkIsScalarInteger($1, "[]");
          $$ = $1;
      }
      ;
  
  function_call
      : function_call_or_method {
          $$ = context->addFunctionCallOrMethod($1, @1);
      }
      ;
  
  function_call_or_method
      : function_call_generic {
          $$ = $1;
      }
      | postfix_expression DOT function_call_generic {
          ES3_OR_NEWER("", @3, "methods");
          $$ = $3;
          $$->setThisNode($1);
      }
      ;
  
  function_call_generic
      : function_call_header_with_parameters RIGHT_PAREN {
          $$ = $1;
      }
      | function_call_header_no_parameters RIGHT_PAREN {
          $$ = $1;
      }
      ;
  
  function_call_header_no_parameters
      : function_call_header VOID_TYPE {
          $$ = $1;
      }
      | function_call_header {
          $$ = $1;
      }
      ;
  
  function_call_header_with_parameters
      : function_call_header assignment_expression {
          $$ = $1;
          $$->addArgument($2);
      }
      | function_call_header_with_parameters COMMA assignment_expression {
          $$ = $1;
          $$->addArgument($3);
      }
      ;
  
  function_call_header
      : function_identifier LEFT_PAREN {
          $$ = $1;
      }
      ;
  
  // Grammar Note:  Constructors look like functions, but are recognized as types.
  
  function_identifier
      : type_specifier_no_prec {
          $$ = context->addConstructorFunc($1);
      }
      | IDENTIFIER {
          $$ = context->addNonConstructorFunc(ImmutableString($1.string), $1.symbol);
      }
      | FIELD_SELECTION {
          $$ = context->addNonConstructorFunc(ImmutableString($1.string), $1.symbol);
      }
      ;
  
  unary_expression
      : postfix_expression {
          $$ = $1;
      }
      | INC_OP unary_expression {
          $$ = context->addUnaryMathLValue(EOpPreIncrement, $2, @1);
      }
      | DEC_OP unary_expression {
          $$ = context->addUnaryMathLValue(EOpPreDecrement, $2, @1);
      }
      | unary_operator unary_expression {
          $$ = context->addUnaryMath($1, $2, @1);
      }
      ;
  // Grammar Note:  No traditional style type casts.
  
  unary_operator
      : PLUS  { $$ = EOpPositive; }
      | DASH  { $$ = EOpNegative; }
      | BANG  { $$ = EOpLogicalNot; }
      | TILDE {
          ES3_OR_NEWER("~", @$, "bit-wise operator");
          $$ = EOpBitwiseNot;
      }
      ;
  // Grammar Note:  No '*' or '&' unary ops.  Pointers are not supported.
  
  multiplicative_expression
      : unary_expression { $$ = $1; }
      | multiplicative_expression STAR unary_expression {
          $$ = context->addBinaryMath(EOpMul, $1, $3, @2);
      }
      | multiplicative_expression SLASH unary_expression {
          $$ = context->addBinaryMath(EOpDiv, $1, $3, @2);
      }
      | multiplicative_expression PERCENT unary_expression {
          ES3_OR_NEWER("%", @2, "integer modulus operator");
          $$ = context->addBinaryMath(EOpIMod, $1, $3, @2);
      }
      ;
  
  additive_expression
      : multiplicative_expression { $$ = $1; }
      | additive_expression PLUS multiplicative_expression {
          $$ = context->addBinaryMath(EOpAdd, $1, $3, @2);
      }
      | additive_expression DASH multiplicative_expression {
          $$ = context->addBinaryMath(EOpSub, $1, $3, @2);
      }
      ;
  
  shift_expression
      : additive_expression { $$ = $1; }
      | shift_expression LEFT_OP additive_expression {
          ES3_OR_NEWER("<<", @2, "bit-wise operator");
          $$ = context->addBinaryMath(EOpBitShiftLeft, $1, $3, @2);
      }
      | shift_expression RIGHT_OP additive_expression {
          ES3_OR_NEWER(">>", @2, "bit-wise operator");
          $$ = context->addBinaryMath(EOpBitShiftRight, $1, $3, @2);
      }
      ;
  
  relational_expression
      : shift_expression { $$ = $1; }
      | relational_expression LEFT_ANGLE shift_expression {
          $$ = context->addBinaryMathBooleanResult(EOpLessThan, $1, $3, @2);
      }
      | relational_expression RIGHT_ANGLE shift_expression  {
          $$ = context->addBinaryMathBooleanResult(EOpGreaterThan, $1, $3, @2);
      }
      | relational_expression LE_OP shift_expression  {
          $$ = context->addBinaryMathBooleanResult(EOpLessThanEqual, $1, $3, @2);
      }
      | relational_expression GE_OP shift_expression  {
          $$ = context->addBinaryMathBooleanResult(EOpGreaterThanEqual, $1, $3, @2);
      }
      ;
  
  equality_expression
      : relational_expression { $$ = $1; }
      | equality_expression EQ_OP relational_expression  {
          $$ = context->addBinaryMathBooleanResult(EOpEqual, $1, $3, @2);
      }
      | equality_expression NE_OP relational_expression {
          $$ = context->addBinaryMathBooleanResult(EOpNotEqual, $1, $3, @2);
      }
      ;
  
  and_expression
      : equality_expression { $$ = $1; }
      | and_expression AMPERSAND equality_expression {
          ES3_OR_NEWER("&", @2, "bit-wise operator");
          $$ = context->addBinaryMath(EOpBitwiseAnd, $1, $3, @2);
      }
      ;
  
  exclusive_or_expression
      : and_expression { $$ = $1; }
      | exclusive_or_expression CARET and_expression {
          ES3_OR_NEWER("^", @2, "bit-wise operator");
          $$ = context->addBinaryMath(EOpBitwiseXor, $1, $3, @2);
      }
      ;
  
  inclusive_or_expression
      : exclusive_or_expression { $$ = $1; }
      | inclusive_or_expression VERTICAL_BAR exclusive_or_expression {
          ES3_OR_NEWER("|", @2, "bit-wise operator");
          $$ = context->addBinaryMath(EOpBitwiseOr, $1, $3, @2);
      }
      ;
  
  logical_and_expression
      : inclusive_or_expression { $$ = $1; }
      | logical_and_expression AND_OP {
          context->onShortCircuitAndBegin($1, @2);
      } inclusive_or_expression {
          $$ = context->addBinaryMathBooleanResult(EOpLogicalAnd, $1, $4, @2);
      }
      ;
  
  logical_xor_expression
      : logical_and_expression { $$ = $1; }
      | logical_xor_expression XOR_OP logical_and_expression  {
          $$ = context->addBinaryMathBooleanResult(EOpLogicalXor, $1, $3, @2);
      }
      ;
  
  logical_or_expression
      : logical_xor_expression { $$ = $1; }
      | logical_or_expression OR_OP {
          context->onShortCircuitOrBegin($1, @2);
      } logical_xor_expression  {
          $$ = context->addBinaryMathBooleanResult(EOpLogicalOr, $1, $4, @2);
      }
      ;
  
  conditional_expression
      : logical_or_expression { $$ = $1; }
      | logical_or_expression QUESTION {
          context->onTernaryConditionParsed($1, @2);
      } expression COLON {
          context->onTernaryTrueExpressionParsed($4, @2);
      } assignment_expression {
          $$ = context->addTernarySelection($1, $4, $7, @2);
      }
      ;
  
  assignment_expression
      : conditional_expression { $$ = $1; }
      | unary_expression assignment_operator assignment_expression {
          $$ = context->addAssign($2, $1, $3, @2);
      }
      ;
  
  assignment_operator
      : EQUAL        { $$ = EOpAssign; }
      | MUL_ASSIGN   { $$ = EOpMulAssign; }
      | DIV_ASSIGN   { $$ = EOpDivAssign; }
      | MOD_ASSIGN   {
          ES3_OR_NEWER("%=", @$, "integer modulus operator");
          $$ = EOpIModAssign;
      }
      | ADD_ASSIGN   { $$ = EOpAddAssign; }
      | SUB_ASSIGN   { $$ = EOpSubAssign; }
      | LEFT_ASSIGN {
          ES3_OR_NEWER("<<=", @$, "bit-wise operator");
          $$ = EOpBitShiftLeftAssign;
      }
      | RIGHT_ASSIGN {
          ES3_OR_NEWER(">>=", @$, "bit-wise operator");
          $$ = EOpBitShiftRightAssign;
      }
      | AND_ASSIGN {
          ES3_OR_NEWER("&=", @$, "bit-wise operator");
          $$ = EOpBitwiseAndAssign;
      }
      | XOR_ASSIGN {
          ES3_OR_NEWER("^=", @$, "bit-wise operator");
          $$ = EOpBitwiseXorAssign;
      }
      | OR_ASSIGN {
          ES3_OR_NEWER("|=", @$, "bit-wise operator");
          $$ = EOpBitwiseOrAssign;
      }
      ;
  
  expression
      : assignment_expression {
          $$ = $1;
      }
      | expression COMMA {
          context->onCommaLeftHandSideParsed($1);
      } assignment_expression {
          $$ = context->addComma($1, $4, @2);
      }
      ;
  
  constant_expression
      : conditional_expression {
          context->checkIsConst($1);
          $$ = $1;
      }
      ;
  
  enter_struct
      : IDENTIFIER LEFT_BRACE {
          context->enterStructDeclaration(@1, ImmutableString($1.string));
          $$ = $1;
      }
      ;
  
  declaration
      : function_prototype SEMICOLON {
          $$ = context->addFunctionPrototypeDeclaration(*($1.function), @1);
      }
      | init_declarator_list SEMICOLON {
          $$ = $1.intermDeclaration;
      }
      | PRECISION precision_qualifier type_specifier_no_prec SEMICOLON {
          context->parseDefaultPrecisionQualifier($2, $3, @1);
          $$ = nullptr;
      }
      | type_qualifier enter_struct struct_declaration_list RIGHT_BRACE SEMICOLON {
          ES3_OR_NEWER(ImmutableString($2.string), @1, "interface blocks");
          $$ = context->addInterfaceBlock(*$1, @2, ImmutableString($2.string), $3, kEmptyImmutableString, @$, NULL, @$);
      }
      | type_qualifier enter_struct struct_declaration_list RIGHT_BRACE IDENTIFIER SEMICOLON {
          ES3_OR_NEWER(ImmutableString($2.string), @1, "interface blocks");
          $$ = context->addInterfaceBlock(*$1, @2, ImmutableString($2.string), $3, ImmutableString($5.string), @5, NULL, @$);
      }
      | type_qualifier enter_struct struct_declaration_list RIGHT_BRACE IDENTIFIER array_specifier SEMICOLON {
          ES3_OR_NEWER(ImmutableString($2.string), @1, "interface blocks");
          $$ = context->addInterfaceBlock(*$1, @2, ImmutableString($2.string), $3, ImmutableString($5.string), @5, $6, @6);
      }
      | type_qualifier SEMICOLON {
          context->parseGlobalLayoutQualifier(*$1);
          $$ = nullptr;
      }
      | type_qualifier IDENTIFIER SEMICOLON // e.g. to qualify an existing variable as invariant or precise
      {
          $$ = context->parseGlobalQualifierDeclaration(*$1, @2, ImmutableString($2.string), $2.symbol);
      }
      ;
  
  function_prototype
      : function_declarator RIGHT_PAREN  {
          $$.function = context->parseFunctionDeclarator(@2, $1);
          context->exitFunctionDeclaration();
      }
      ;
  
  function_declarator
      : function_header {
          $$ = $1;
      }
      | function_header_with_parameters {
          $$ = $1;
      }
      ;
  
  
  function_header_with_parameters
      : function_header parameter_declaration {
          // Add the parameter
          $$ = $1;
          if ($2.type.getBasicType() != EbtVoid)
          {
              context->addParameter($1, &$2);
          }
          else
          {
              // Remember that void was seen, so error can be generated if another parameter is seen.
              $1->setHasVoidParameter();
          }
      }
      | function_header_with_parameters COMMA parameter_declaration {
          $$ = $1;
          // Only first parameter of one-parameter functions can be void
          // The check for named parameters not being void is done in parameter_declarator
          if ($3.type.getBasicType() == EbtVoid)
          {
              // This parameter > first is void
              context->error(@2, "cannot be a parameter type except for '(void)'", "void");
          }
          else
          {
              if ($1->hasVoidParameter())
              {
                  // Only first parameter of one-parameter functions can be void.  This check prevents
                  // (void, non_void) parameters.
                  context->error(@2, "cannot be a parameter type except for '(void)'", "void");
              }
              context->addParameter($1, &$3);
          }
      }
      ;
  
  function_header
      : fully_specified_type IDENTIFIER LEFT_PAREN {
          $$ = context->parseFunctionHeader($1, ImmutableString($2.string), @2);
  
          context->symbolTable.push();
          context->enterFunctionDeclaration();
      }
      ;
  
  parameter_declarator
      // Type + name
      : type_specifier identifier {
          $$ = context->parseParameterDeclarator($1, ImmutableString($2.string), @2);
      }
      | type_specifier identifier array_specifier {
          $$ = context->parseParameterArrayDeclarator($1, ImmutableString($2.string), @2, $3, @3);
      }
      ;
  
  parameter_declaration
      : type_qualifier parameter_declarator {
          $$ = $2;
          context->parseParameterQualifier(@2, *$1, $$.type);
      }
      | parameter_declarator {
          $$ = $1;
          $$.type.setQualifier(EvqParamIn);
      }
      | type_qualifier parameter_type_specifier {
          $$ = context->parseParameterDeclarator($2, kEmptyImmutableString, @2);
          context->parseParameterQualifier(@2, *$1, $$.type);
      }
      | parameter_type_specifier {
          $$ = context->parseParameterDeclarator($1, kEmptyImmutableString, @1);
          $$.type.setQualifier(EvqParamIn);
      }
      ;
  
  parameter_type_specifier
      : type_specifier {
          $$ = $1;
      }
      ;
  
  init_declarator_list
      : single_declaration {
          $$ = $1;
      }
      | init_declarator_list COMMA identifier {
          $$ = $1;
          context->parseDeclarator($$.type, @3, ImmutableString($3.string), $$.intermDeclaration);
      }
      | init_declarator_list COMMA identifier array_specifier {
          $$ = $1;
          context->parseArrayDeclarator($$.type, @3, ImmutableString($3.string), @4, *($4), $$.intermDeclaration);
      }
      | init_declarator_list COMMA identifier array_specifier EQUAL initializer {
          ES3_OR_NEWER("=", @5, "first-class arrays (array initializer)");
          $$ = $1;
          context->parseArrayInitDeclarator($$.type, @3, ImmutableString($3.string), @4, *($4), @5, $6, $$.intermDeclaration);
      }
      | init_declarator_list COMMA identifier EQUAL initializer {
          $$ = $1;
          context->parseInitDeclarator($$.type, @3, ImmutableString($3.string), @4, $5, $$.intermDeclaration);
      }
      ;
  
  single_declaration
      : fully_specified_type {
          $$.type = $1;
          $$.intermDeclaration = context->parseSingleDeclaration($$.type, @1, kEmptyImmutableString);
      }
      | fully_specified_type identifier {
          $$.type = $1;
          $$.intermDeclaration = context->parseSingleDeclaration($$.type, @2, ImmutableString($2.string));
      }
      | fully_specified_type identifier array_specifier {
          $$.type = $1;
          $$.intermDeclaration = context->parseSingleArrayDeclaration($$.type, @2, ImmutableString($2.string), @3, *($3));
      }
      | fully_specified_type identifier array_specifier EQUAL initializer {
          ES3_OR_NEWER("[]", @3, "first-class arrays (array initializer)");
          $$.type = $1;
          $$.intermDeclaration = context->parseSingleArrayInitDeclaration($$.type, @2, ImmutableString($2.string), @3, *($3), @4, $5);
      }
      | fully_specified_type identifier EQUAL initializer {
          $$.type = $1;
          $$.intermDeclaration = context->parseSingleInitDeclaration($$.type, @2, ImmutableString($2.string), @3, $4);
      }
      ;
  
  fully_specified_type
      : type_specifier {
          context->addFullySpecifiedType(&$1);
          $$ = $1;
      }
      | type_qualifier type_specifier {
          $$ = context->addFullySpecifiedType(*$1, $2);
      }
      ;
  
  interpolation_qualifier
      : SMOOTH {
          $$ = EvqSmooth;
      }
      | FLAT {
          $$ = EvqFlat;
      }
      | NOPERSPECTIVE {
          if (!context->checkCanUseExtension(@1, TExtension::NV_shader_noperspective_interpolation))
          {
              context->error(@1, "unsupported interpolation qualifier", "noperspective");
          }
          $$ = EvqNoPerspective;
      }
      ;
  
  type_qualifier
      : single_type_qualifier {
          $$ = context->createTypeQualifierBuilder(@1);
          $$->appendQualifier($1);
      }
      | type_qualifier single_type_qualifier {
          $$ = $1;
          $$->appendQualifier($2);
      }
      ;
  
  invariant_qualifier
      : INVARIANT {
          // empty
      }
      ;
  
  precise_qualifier
      : PRECISE {
          context->markShaderHasPrecise();
      }
      ;
  
  single_type_qualifier
      : storage_qualifier {
          context->checkLocalVariableConstStorageQualifier(*$1);
          $$ = $1;
      }
      | layout_qualifier {
          context->checkIsAtGlobalLevel(@1, "layout");
          $$ = new TLayoutQualifierWrapper($1, @1);
      }
      | precision_qualifier {
          $$ = new TPrecisionQualifierWrapper($1, @1);
      }
      | interpolation_qualifier {
          $$ = new TInterpolationQualifierWrapper($1, @1);
      }
      | invariant_qualifier {
          context->checkIsAtGlobalLevel(@1, "invariant");
          $$ = new TInvariantQualifierWrapper(@1);
      }
      | precise_qualifier {
          $$ = new TPreciseQualifierWrapper(@1);
      }
      ;
  
  
  storage_qualifier
      :
      ATTRIBUTE {
          VERTEX_ONLY("attribute", @1);
          ES2_ONLY("attribute", @1);
          $$ = context->parseGlobalStorageQualifier(EvqAttribute, @1);
      }
      | VARYING {
          ES2_ONLY("varying", @1);
          $$ = context->parseVaryingQualifier(@1);
      }
      | CONST_QUAL {
          $$ = new TStorageQualifierWrapper(EvqConst, @1);
      }
      | IN_QUAL {
          $$ = context->parseInQualifier(@1);
      }
      | OUT_QUAL {
          $$ = context->parseOutQualifier(@1);
      }
      | INOUT_QUAL {
          $$ = context->parseInOutQualifier(@1);
      }
      | CENTROID {
          ES3_OR_NEWER("centroid", @1, "storage qualifier");
          $$ = new TStorageQualifierWrapper(EvqCentroid, @1);
      }
      | PATCH {
          constexpr std::array<TExtension, 2u> extensions{ { TExtension::OES_tessellation_shader,
                                                             TExtension::EXT_tessellation_shader } };
          if (context->getShaderVersion() < 320
          && !context->checkCanUseOneOfExtensions(@1, extensions))
          {
              context->error(@1, "unsupported storage qualifier", "patch");
          }
          $$ = new TStorageQualifierWrapper(EvqPatch, @1);
      }
      | UNIFORM {
          $$ = context->parseGlobalStorageQualifier(EvqUniform, @1);
      }
      | BUFFER {
          ES3_1_OR_NEWER("buffer", @1, "storage qualifier");
          $$ = context->parseGlobalStorageQualifier(EvqBuffer, @1);
      }
      | READONLY {
          $$ = new TMemoryQualifierWrapper(EvqReadOnly, @1);
      }
      | WRITEONLY {
          $$ = new TMemoryQualifierWrapper(EvqWriteOnly, @1);
      }
      | COHERENT {
          $$ = new TMemoryQualifierWrapper(EvqCoherent, @1);
      }
      | RESTRICT {
          $$ = new TMemoryQualifierWrapper(EvqRestrict, @1);
      }
      | VOLATILE {
          $$ = new TMemoryQualifierWrapper(EvqVolatile, @1);
      }
      | SHARED {
          COMPUTE_ONLY("shared", @1);
          $$ = context->parseGlobalStorageQualifier(EvqShared, @1);
      }
      | SAMPLE {
          ES3_OR_NEWER("sample", @1, "storage qualifier");
          $$ = new TStorageQualifierWrapper(EvqSample, @1);
      }
      ;
  
  type_specifier
      : type_specifier_no_prec {
          $$ = $1;
          $$.precision = context->symbolTable.getDefaultPrecision($1.getBasicType());
      }
      ;
  
  precision_qualifier
      : HIGH_PRECISION {
          $$ = EbpHigh;
      }
      | MEDIUM_PRECISION {
          $$ = EbpMedium;
      }
      | LOW_PRECISION  {
          $$ = EbpLow;
      }
      ;
  
  layout_qualifier
      : LAYOUT LEFT_PAREN layout_qualifier_id_list RIGHT_PAREN {
          context->checkCanUseLayoutQualifier(@1);
          $$ = $3;
      }
      ;
  
  layout_qualifier_id_list
      : layout_qualifier_id {
          $$ = $1;
      }
      | layout_qualifier_id_list COMMA layout_qualifier_id {
          $$ = context->joinLayoutQualifiers($1, $3, @3);
      }
      ;
  
  layout_qualifier_id
      : IDENTIFIER {
          $$ = context->parseLayoutQualifier(ImmutableString($1.string), @1);
      }
      | IDENTIFIER EQUAL INTCONSTANT {
          $$ = context->parseLayoutQualifier(ImmutableString($1.string), @1, $3.i, @3);
      }
      | IDENTIFIER EQUAL UINTCONSTANT {
          $$ = context->parseLayoutQualifier(ImmutableString($1.string), @1, $3.i, @3);
      }
      | SHARED {
          $$ = context->parseLayoutQualifier(ImmutableString("shared"), @1);
      }
      ;
  
  type_specifier_no_prec
      : type_specifier_nonarray {
          $$.initialize($1, (context->symbolTable.atGlobalLevel() ? EvqGlobal : EvqTemporary));
      }
      | type_specifier_nonarray array_specifier {
          $$.initialize($1, (context->symbolTable.atGlobalLevel() ? EvqGlobal : EvqTemporary));
          $$.setArraySizes($2);
      }
      ;
  
  array_specifier
      : LEFT_BRACKET RIGHT_BRACKET {
          ES3_OR_NEWER("[]", @1, "implicitly sized array");
          $$ = new TVector<unsigned int>();
          $$->push_back(0u);
      }
      | LEFT_BRACKET constant_expression RIGHT_BRACKET {
          $$ = new TVector<unsigned int>();
          unsigned int size = context->checkIsValidArraySize(@1, $2);
          // Make the type an array even if size check failed.
          // This ensures useless error messages regarding a variable's non-arrayness won't follow.
          $$->push_back(size);
      }
      | array_specifier LEFT_BRACKET RIGHT_BRACKET {
          ES3_1_OR_NEWER("[]", @2, "arrays of arrays");
          $$ = $1;
          $$->insert($$->begin(), 0u);
          if (!context->checkIsValidArrayDimension(@2, $$)) {
              YYABORT;
          }
      }
      | array_specifier LEFT_BRACKET constant_expression RIGHT_BRACKET {
          ES3_1_OR_NEWER("[]", @2, "arrays of arrays");
          $$ = $1;
          unsigned int size = context->checkIsValidArraySize(@2, $3);
          // Make the type an array even if size check failed.
          // This ensures useless error messages regarding a variable's non-arrayness won't follow.
          $$->insert($$->begin(), size);
          if (!context->checkIsValidArrayDimension(@2, $$)) {
              YYABORT;
          }
      }
      ;
  
  type_specifier_nonarray
      : VOID_TYPE {
          $$.initialize(EbtVoid, @1);
      }
      | FLOAT_TYPE {
          $$.initialize(EbtFloat, @1);
      }
      | INT_TYPE {
          $$.initialize(EbtInt, @1);
      }
      | UINT_TYPE {
          $$.initialize(EbtUInt, @1);
      }
      | BOOL_TYPE {
          $$.initialize(EbtBool, @1);
      }
      | VEC2 {
          $$.initialize(EbtFloat, @1);
          $$.setAggregate(2);
      }
      | VEC3 {
          $$.initialize(EbtFloat, @1);
          $$.setAggregate(3);
      }
      | VEC4 {
          $$.initialize(EbtFloat, @1);
          $$.setAggregate(4);
      }
      | BVEC2 {
          $$.initialize(EbtBool, @1);
          $$.setAggregate(2);
      }
      | BVEC3 {
          $$.initialize(EbtBool, @1);
          $$.setAggregate(3);
      }
      | BVEC4 {
          $$.initialize(EbtBool, @1);
          $$.setAggregate(4);
      }
      | IVEC2 {
          $$.initialize(EbtInt, @1);
          $$.setAggregate(2);
      }
      | IVEC3 {
          $$.initialize(EbtInt, @1);
          $$.setAggregate(3);
      }
      | IVEC4 {
          $$.initialize(EbtInt, @1);
          $$.setAggregate(4);
      }
      | UVEC2 {
          $$.initialize(EbtUInt, @1);
          $$.setAggregate(2);
      }
      | UVEC3 {
          $$.initialize(EbtUInt, @1);
          $$.setAggregate(3);
      }
      | UVEC4 {
          $$.initialize(EbtUInt, @1);
          $$.setAggregate(4);
      }
      | MATRIX2 {
          $$.initialize(EbtFloat, @1);
          $$.setMatrix(2, 2);
      }
      | MATRIX3 {
          $$.initialize(EbtFloat, @1);
          $$.setMatrix(3, 3);
      }
      | MATRIX4 {
          $$.initialize(EbtFloat, @1);
          $$.setMatrix(4, 4);
      }
      | MATRIX2x3 {
          $$.initialize(EbtFloat, @1);
          $$.setMatrix(2, 3);
      }
      | MATRIX3x2 {
          $$.initialize(EbtFloat, @1);
          $$.setMatrix(3, 2);
      }
      | MATRIX2x4 {
          $$.initialize(EbtFloat, @1);
          $$.setMatrix(2, 4);
      }
      | MATRIX4x2 {
          $$.initialize(EbtFloat, @1);
          $$.setMatrix(4, 2);
      }
      | MATRIX3x4 {
          $$.initialize(EbtFloat, @1);
          $$.setMatrix(3, 4);
      }
      | MATRIX4x3 {
          $$.initialize(EbtFloat, @1);
          $$.setMatrix(4, 3);
      }
      | YUVCSCSTANDARDEXT {
          if (!context->checkCanUseExtension(@1, TExtension::EXT_YUV_target))
          {
              context->error(@1, "unsupported type", "yuvCscStandardEXT");
          }
          $$.initialize(EbtYuvCscStandardEXT, @1);
      }
      | SAMPLER2D {
          $$.initialize(EbtSampler2D, @1);
      }
      | SAMPLER3D {
          $$.initialize(EbtSampler3D, @1);
      }
      | SAMPLERCUBE {
          $$.initialize(EbtSamplerCube, @1);
      }
      | SAMPLER2DARRAY {
          $$.initialize(EbtSampler2DArray, @1);
      }
      | SAMPLER2DMS {
          $$.initialize(EbtSampler2DMS, @1);
      }
      | SAMPLER2DMSARRAY {
          $$.initialize(EbtSampler2DMSArray, @1);
      }
      | SAMPLERCUBEARRAYOES {
          if (context->getShaderVersion() < 320
          && !context->checkCanUseExtension(@1, TExtension::OES_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__samplerCubeArray");
          }
          $$.initialize(EbtSamplerCubeArray, @1);
      }
      | SAMPLERCUBEARRAYEXT {
          if (context->getShaderVersion() < 320
          && !context->checkCanUseExtension(@1, TExtension::EXT_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__samplerCubeArray");
          }
          $$.initialize(EbtSamplerCubeArray, @1);
      }
      | SAMPLERBUFFER {
          constexpr std::array<TExtension, 2u> extensions{ { TExtension::OES_texture_buffer,
                                                             TExtension::EXT_texture_buffer } };
          if (context->getShaderVersion() < 320
          && !context->checkCanUseOneOfExtensions(@1, extensions))
          {
              context->error(@1, "unsupported type", "__samplerBuffer");
          }
          $$.initialize(EbtSamplerBuffer, @1);
      }
      | ISAMPLER2D {
          $$.initialize(EbtISampler2D, @1);
      }
      | ISAMPLER3D {
          $$.initialize(EbtISampler3D, @1);
      }
      | ISAMPLERCUBE {
          $$.initialize(EbtISamplerCube, @1);
      }
      | ISAMPLER2DARRAY {
          $$.initialize(EbtISampler2DArray, @1);
      }
      | ISAMPLER2DMS {
          $$.initialize(EbtISampler2DMS, @1);
      }
      | ISAMPLER2DMSARRAY {
          $$.initialize(EbtISampler2DMSArray, @1);
      }
      | ISAMPLERCUBEARRAYOES {
          if (context->getShaderVersion() < 320
          && !context->checkCanUseExtension(@1, TExtension::OES_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__isamplerCubeArray");
          }
          $$.initialize(EbtISamplerCubeArray, @1);
      }
      | ISAMPLERCUBEARRAYEXT {
          if (context->getShaderVersion() < 320
          && !context->checkCanUseExtension(@1, TExtension::EXT_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__isamplerCubeArray");
          }
          $$.initialize(EbtISamplerCubeArray, @1);
      }
      | ISAMPLERBUFFER {
          constexpr std::array<TExtension, 2u> extensions{ { TExtension::OES_texture_buffer,
                                                             TExtension::EXT_texture_buffer } };
          if (context->getShaderVersion() < 320
          && !context->checkCanUseOneOfExtensions(@1, extensions))
          {
              context->error(@1, "unsupported type", "__isamplerBuffer");
          }
          $$.initialize(EbtISamplerBuffer, @1);
      }
      | USAMPLER2D {
          $$.initialize(EbtUSampler2D, @1);
      }
      | USAMPLER3D {
          $$.initialize(EbtUSampler3D, @1);
      }
      | USAMPLERCUBE {
          $$.initialize(EbtUSamplerCube, @1);
      }
      | USAMPLER2DARRAY {
          $$.initialize(EbtUSampler2DArray, @1);
      }
      | USAMPLER2DMS {
          $$.initialize(EbtUSampler2DMS, @1);
      }
      | USAMPLER2DMSARRAY {
          $$.initialize(EbtUSampler2DMSArray, @1);
      }
      | USAMPLERCUBEARRAYOES {
          if (context->getShaderVersion() < 320
          && !context->checkCanUseExtension(@1, TExtension::OES_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__usamplerCubeArray");
          }
          $$.initialize(EbtUSamplerCubeArray, @1);
      }
      | USAMPLERCUBEARRAYEXT {
          if (context->getShaderVersion() < 320
          && !context->checkCanUseExtension(@1, TExtension::EXT_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__usamplerCubeArray");
          }
          $$.initialize(EbtUSamplerCubeArray, @1);
      }
      | USAMPLERBUFFER {
          constexpr std::array<TExtension, 2u> extensions{ { TExtension::OES_texture_buffer,
                                                             TExtension::EXT_texture_buffer } };
          if (context->getShaderVersion() < 320
          && !context->checkCanUseOneOfExtensions(@1, extensions))
          {
              context->error(@1, "unsupported type", "__usamplerBuffer");
          }
          $$.initialize(EbtUSamplerBuffer, @1);
      }
      | SAMPLER2DSHADOW {
          $$.initialize(EbtSampler2DShadow, @1);
      }
      | SAMPLERCUBESHADOW {
          $$.initialize(EbtSamplerCubeShadow, @1);
      }
      | SAMPLER2DARRAYSHADOW {
          $$.initialize(EbtSampler2DArrayShadow, @1);
      }
      | SAMPLERCUBEARRAYSHADOWOES {
          if (context->getShaderVersion() < 320
          && !context->checkCanUseExtension(@1, TExtension::OES_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__samplerCubeArrayShadow");
          }
          $$.initialize(EbtSamplerCubeArrayShadow, @1);
      }
      | SAMPLERCUBEARRAYSHADOWEXT {
          if (context->getShaderVersion() < 320
          && !context->checkCanUseExtension(@1, TExtension::EXT_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__samplerCubeArrayShadow");
          }
          $$.initialize(EbtSamplerCubeArrayShadow, @1);
      }
      | SAMPLERVIDEOWEBGL {
          if (!context->checkCanUseExtension(@1, TExtension::WEBGL_video_texture))
          {
              context->error(@1, "unsupported type", "samplerVideoWEBGL");
          }
          $$.initialize(EbtSamplerVideoWEBGL, @1);
      }
      | SAMPLER_EXTERNAL_OES {
          constexpr std::array<TExtension, 3u> extensions{ { TExtension::NV_EGL_stream_consumer_external,
                                                             TExtension::OES_EGL_image_external_essl3,
                                                             TExtension::OES_EGL_image_external } };
          if (!context->checkCanUseOneOfExtensions(@1, extensions))
          {
              context->error(@1, "unsupported type", "samplerExternalOES");
          }
          $$.initialize(EbtSamplerExternalOES, @1);
      }
      | SAMPLEREXTERNAL2DY2YEXT {
          if (!context->checkCanUseExtension(@1, TExtension::EXT_YUV_target))
          {
              context->error(@1, "unsupported type", "__samplerExternal2DY2YEXT");
          }
          $$.initialize(EbtSamplerExternal2DY2YEXT, @1);
      }
      | SAMPLER2DRECT {
          if (!context->checkCanUseExtension(@1, TExtension::ARB_texture_rectangle))
          {
              context->error(@1, "unsupported type", "sampler2DRect");
          }
          $$.initialize(EbtSampler2DRect, @1);
      }
      | IMAGE2D {
          $$.initialize(EbtImage2D, @1);
      }
      | IIMAGE2D {
          $$.initialize(EbtIImage2D, @1);
      }
      | UIMAGE2D {
          $$.initialize(EbtUImage2D, @1);
      }
      | IMAGE3D {
          $$.initialize(EbtImage3D, @1);
      }
      | IIMAGE3D {
          $$.initialize(EbtIImage3D, @1);
      }
      | UIMAGE3D {
          $$.initialize(EbtUImage3D, @1);
      }
      | IMAGE2DARRAY {
          $$.initialize(EbtImage2DArray, @1);
      }
      | IIMAGE2DARRAY {
          $$.initialize(EbtIImage2DArray, @1);
      }
      | UIMAGE2DARRAY {
          $$.initialize(EbtUImage2DArray, @1);
      }
      | IMAGECUBE {
          $$.initialize(EbtImageCube, @1);
      }
      | IIMAGECUBE {
          $$.initialize(EbtIImageCube, @1);
      }
      | UIMAGECUBE {
          $$.initialize(EbtUImageCube, @1);
      }
      | IMAGECUBEARRAYOES {
          if (context->getShaderVersion() < 320
          && !context->checkCanUseExtension(@1, TExtension::OES_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__imageCubeArray");
          }
          $$.initialize(EbtImageCubeArray, @1);
      }
      | IMAGECUBEARRAYEXT {
          if (context->getShaderVersion() < 320
          && !context->checkCanUseExtension(@1, TExtension::EXT_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__imageCubeArray");
          }
          $$.initialize(EbtImageCubeArray, @1);
      }
      | IIMAGECUBEARRAYOES {
          if (context->getShaderVersion() < 320
          && !context->checkCanUseExtension(@1, TExtension::OES_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__iimageCubeArray");
          }
          $$.initialize(EbtIImageCubeArray, @1);
      }
      | IIMAGECUBEARRAYEXT {
          if (context->getShaderVersion() < 320
          && !context->checkCanUseExtension(@1, TExtension::EXT_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__iimageCubeArray");
          }
          $$.initialize(EbtIImageCubeArray, @1);
      }
      | UIMAGECUBEARRAYOES {
         if (context->getShaderVersion() < 320
         && !context->checkCanUseExtension(@1, TExtension::OES_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__uimageCubeArray");
          }
          $$.initialize(EbtUImageCubeArray, @1);
      }
      | UIMAGECUBEARRAYEXT {
         if (context->getShaderVersion() < 320
         && !context->checkCanUseExtension(@1, TExtension::EXT_texture_cube_map_array))
          {
              context->error(@1, "unsupported type", "__uimageCubeArray");
          }
          $$.initialize(EbtUImageCubeArray, @1);
      }
      | IMAGEBUFFER {
          constexpr std::array<TExtension, 2u> extensions{ { TExtension::OES_texture_buffer,
                                                             TExtension::EXT_texture_buffer } };
          if (context->getShaderVersion() < 320
          && !context->checkCanUseOneOfExtensions(@1, extensions))
          {
              context->error(@1, "unsupported type", "__imageBuffer");
          }
          $$.initialize(EbtImageBuffer, @1);
      }
      | IIMAGEBUFFER {
          constexpr std::array<TExtension, 2u> extensions{ { TExtension::OES_texture_buffer,
                                                             TExtension::EXT_texture_buffer } };
          if (context->getShaderVersion() < 320
          && !context->checkCanUseOneOfExtensions(@1, extensions))
          {
              context->error(@1, "unsupported type", "__iimageBuffer");
          }
          $$.initialize(EbtIImageBuffer, @1);
      }
      | UIMAGEBUFFER {
          constexpr std::array<TExtension, 2u> extensions{ { TExtension::OES_texture_buffer,
                                                             TExtension::EXT_texture_buffer } };
          if (context->getShaderVersion() < 320
          && !context->checkCanUseOneOfExtensions(@1, extensions))
          {
              context->error(@1, "unsupported type", "__uimageBuffer");
          }
          $$.initialize(EbtUImageBuffer, @1);
      }
      | ATOMICUINT {
          $$.initialize(EbtAtomicCounter, @1);
      }
      | PIXELLOCALANGLE {
          if (!context->checkCanUseExtension(@1, TExtension::ANGLE_shader_pixel_local_storage))
          {
              context->error(@1, "unsupported type", "__pixelLocalANGLE");
          }
          $$.initialize(EbtPixelLocalANGLE, @1);
      }
      | IPIXELLOCALANGLE {
          if (!context->checkCanUseExtension(@1, TExtension::ANGLE_shader_pixel_local_storage))
          {
              context->error(@1, "unsupported type", "__ipixelLocalANGLE");
          }
          $$.initialize(EbtIPixelLocalANGLE, @1);
      }
      | UPIXELLOCALANGLE {
          if (!context->checkCanUseExtension(@1, TExtension::ANGLE_shader_pixel_local_storage))
          {
              context->error(@1, "unsupported type", "__upixelLocalANGLE");
          }
          $$.initialize(EbtUPixelLocalANGLE, @1);
      }
      | struct_specifier {
          $$ = $1;
      }
      | TYPE_NAME {
          // This is for user defined type names. The lexical phase looked up the type.
          const TStructure *structure = static_cast<const TStructure*>($1.symbol);
          // Temporary check until VK and Metal backends support type name like gl_DepthRangeParameters.
          context->checkIsNotReserved(@1, ImmutableString($1.string));
          $$.initializeStruct(structure, false, @1);
      }
      ;
  
  struct_specifier
      : STRUCT identifier LEFT_BRACE { context->enterStructDeclaration(@2, ImmutableString($2.string)); } struct_declaration_list RIGHT_BRACE {
          $$ = context->addStructure(@1, @2, ImmutableString($2.string), $5);
      }
      | STRUCT LEFT_BRACE { context->enterStructDeclaration(@2, kEmptyImmutableString); } struct_declaration_list RIGHT_BRACE {
          $$ = context->addStructure(@1, @$, kEmptyImmutableString, $4);
      }
      ;
  
  struct_declaration_list
      : struct_declaration {
          $$ = context->addStructFieldList($1, @1);
      }
      | struct_declaration_list struct_declaration {
          $$ = context->combineStructFieldLists($1, $2, @2);
      }
      ;
  
  struct_declaration
      : type_specifier struct_declarator_list SEMICOLON {
          $$ = context->addStructDeclaratorList($1, $2);
      }
      | type_qualifier type_specifier struct_declarator_list SEMICOLON {
          // ES3 Only, but errors should be handled elsewhere
          $$ = context->addStructDeclaratorListWithQualifiers(*$1, &$2, $3);
      }
      ;
  
  struct_declarator_list
      : struct_declarator {
          $$ = new TDeclaratorList();
          $$->push_back($1);
      }
      | struct_declarator_list COMMA struct_declarator {
          $$->push_back($3);
      }
      ;
  
  struct_declarator
      : identifier {
          $$ = context->parseStructDeclarator(ImmutableString($1.string), @1);
      }
      | identifier array_specifier {
          $$ = context->parseStructArrayDeclarator(ImmutableString($1.string), @1, $2);
      }
      ;
  
  initializer
      : assignment_expression { $$ = $1; }
      ;
  
  declaration_statement
      : declaration { $$ = $1; }
      ;
  
  statement
      : compound_statement_with_scope { $$ = $1; }
      | simple_statement              { $$ = $1; }
      ;
  
  // Grammar Note:  Labeled statements for SWITCH only; 'goto' is not supported.
  
  simple_statement
      : declaration_statement { $$ = $1; }
      | expression_statement  { $$ = $1; }
      | selection_statement   { $$ = $1; }
      | switch_statement      { $$ = $1; }
      | case_label            { $$ = $1; }
      | iteration_statement   { $$ = $1; }
      | jump_statement        { $$ = $1; }
      ;
  
  compound_statement_with_scope
      : LEFT_BRACE RIGHT_BRACE {
          $$ = new TIntermBlock();
          $$->setLine(@$);
      }
      | LEFT_BRACE { context->symbolTable.push(); } statement_list { context->symbolTable.pop(); } RIGHT_BRACE {
          $3->setLine(@$);
          $$ = $3;
      }
      ;
  
  statement_no_new_scope
      : compound_statement_no_new_scope { $$ = $1; }
      | simple_statement                {
          context->endStatementWithValue($1);
          $$ = $1;
      }
      ;
  
  statement_with_scope
      : { context->symbolTable.push(); } compound_statement_no_new_scope { context->symbolTable.pop(); $$ = $2; }
      | { context->symbolTable.push(); } simple_statement                {
          context->endStatementWithValue($2);
          context->symbolTable.pop();
          $$ = $2;
      }
      ;
  
  compound_statement_no_new_scope
      // Statement that doesn't create a new scope for iteration_statement, function definition (scope is created for parameters)
      : LEFT_BRACE RIGHT_BRACE {
          $$ = new TIntermBlock();
          $$->setLine(@$);
      }
      | LEFT_BRACE statement_list RIGHT_BRACE {
          $2->setLine(@$);
          $$ = $2;
      }
      ;
  
  statement_list
      : statement {
          $$ = new TIntermBlock();
          context->appendStatement($$, $1);
      }
      | statement_list statement {
          $$ = $1;
          context->appendStatement($$, $2);
      }
      ;
  
  expression_statement
      : SEMICOLON  { $$ = context->addEmptyStatement(@$); }
      | expression SEMICOLON  {
          context->checkIsValidExpressionStatement(@$, $1);
          $$ = $1;
      }
      ;
  
  selection_statement
      : IF LEFT_PAREN expression RIGHT_PAREN {
          context->onIfTrueBlockBegin($3, @1);
      } selection_rest_statement {
          $$ = context->addIfElse($3, $6, @1);
      }
      ;
  
  selection_rest_statement
      : statement_with_scope ELSE {
          context->onIfTrueBlockEnd();
          context->onIfFalseBlockBegin();
      } statement_with_scope {
          context->onIfFalseBlockEnd();
          $$.node1 = $1;
          $$.node2 = $4;
      }
      | statement_with_scope {
          context->onIfTrueBlockEnd();
          $$.node1 = $1;
          $$.node2 = nullptr;
      }
      ;
  
  // Note that we've diverged from the spec grammar here a bit for the sake of simplicity.
  // We're reusing compound_statement_with_scope instead of having separate rules for switch.
  switch_statement
      : SWITCH LEFT_PAREN expression RIGHT_PAREN { context->beginSwitch(@1); } compound_statement_with_scope {
          $$ = context->addSwitch($3, $6, @1);
      }
      ;
  
  case_label
      : CASE constant_expression COLON {
          $$ = context->addCase($2, @1);
      }
      | DEFAULT COLON {
          $$ = context->addDefault(@1);
      }
      ;
  
  condition
      : expression {
          $$ = $1;
          context->checkIsScalarBool($1->getLine(), $1);
      }
      | fully_specified_type identifier EQUAL initializer {
          $$ = context->addConditionInitializer($1, ImmutableString($2.string), $4, @2);
      }
      ;
  
  iteration_statement
      : WHILE LEFT_PAREN {
          context->symbolTable.push(); context->beginLoop(ELoopWhile, @1);
          context->onLoopConditionBegin(nullptr, @1);
      } condition {
          context->onLoopConditionEnd($4, @4);
      } RIGHT_PAREN statement_no_new_scope {
          context->symbolTable.pop();
          $$ = context->addLoop(ELoopWhile, 0, $4, 0, $7, @1);
      }
      | DO {
          context->beginLoop(ELoopDoWhile, @1);
          context->onDoLoopBegin();
      } statement_with_scope WHILE LEFT_PAREN {
          context->onDoLoopConditionBegin();
      } expression RIGHT_PAREN SEMICOLON {
          $$ = context->addLoop(ELoopDoWhile, 0, $7, 0, $3, @4);
      }
      | FOR LEFT_PAREN { context->symbolTable.push(); context->beginLoop(ELoopFor, @1); } for_init_statement {
          context->onLoopConditionBegin($4, @4);
      } for_rest_statement RIGHT_PAREN statement_no_new_scope {
          context->symbolTable.pop();
          $$ = context->addLoop(ELoopFor, $4, $6.node1, reinterpret_cast<TIntermTyped*>($6.node2), $8, @1);
      }
      ;
  
  for_init_statement
      : expression_statement {
          context->endStatementWithValue($1);
          $$ = $1;
      }
      | declaration_statement {
          $$ = $1;
      }
      ;
  
  conditionopt
      : condition {
          $$ = $1;
      }
      | /* May be null */ {
          $$ = nullptr;
      }
      ;
  
  for_rest_statement
      : conditionopt SEMICOLON {
          context->onLoopConditionEnd($1, @1);
          context->onLoopContinueEnd(nullptr, @1);
          $$.node1 = $1;
          $$.node2 = 0;
      }
      | conditionopt SEMICOLON {
          context->onLoopConditionEnd($1, @1);
      } expression {
          context->onLoopContinueEnd($4, @4);
          $$.node1 = $1;
          $$.node2 = $4;
      }
      ;
  
  jump_statement
      : CONTINUE SEMICOLON {
          $$ = context->addBranch(EOpContinue, @1);
      }
      | BREAK SEMICOLON {
          $$ = context->addBranch(EOpBreak, @1);
      }
      | RETURN SEMICOLON {
          $$ = context->addBranch(EOpReturn, @1);
      }
      | RETURN expression SEMICOLON {
          $$ = context->addBranch(EOpReturn, $2, @1);
      }
      | DISCARD SEMICOLON {
          $$ = context->addBranch(EOpKill, @1);
      }
      ;
  
  // Grammar Note:  No 'goto'.  Gotos are not supported.
  
  translation_unit
      : external_declaration {
          $$ = new TIntermBlock();
          $$->setLine(@$);
          $$->appendStatement($1);
          context->setTreeRoot($$);
      }
      | translation_unit external_declaration {
          $$->appendStatement($2);
      }
      ;
  
  external_declaration
      : function_definition {
          $$ = $1;
      }
      | declaration {
          $$ = $1;
      }
      ;
  
  function_definition
      : function_prototype {
          context->parseFunctionDefinitionHeader(@1, $1.function, &($1.intermFunctionPrototype));
      }
      compound_statement_no_new_scope {
          $$ = context->addFunctionDefinition($1.intermFunctionPrototype, $3, @1);
      }
      ;
  
  %%
  
  int glslang_parse(TParseContext* context) {
      return yyparse(context, context->getScanner());
  }
  

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