Add m-esr52 at 52.6.0

1 files changed, 4492 insertions, 0 deletions

diff --git a/gfx/angle/src/compiler/translator/ParseContext.cpp b/gfx/angle/src/compiler/translator/ParseContext.cpp
new file mode 100755
index 000000000..4ad597c4f
--- /dev/null
+++ b/gfx/angle/src/compiler/translator/ParseContext.cpp
@@ -0,0 +1,4492 @@
+//
+// Copyright (c) 2002-2014 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.
+//
+
+#include "compiler/translator/ParseContext.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+
+#include "compiler/preprocessor/SourceLocation.h"
+#include "compiler/translator/Cache.h"
+#include "compiler/translator/glslang.h"
+#include "compiler/translator/ValidateSwitch.h"
+#include "compiler/translator/ValidateGlobalInitializer.h"
+#include "compiler/translator/util.h"
+
+namespace sh
+{
+
+///////////////////////////////////////////////////////////////////////
+//
+// Sub- vector and matrix fields
+//
+////////////////////////////////////////////////////////////////////////
+
+namespace
+{
+
+const int kWebGLMaxStructNesting = 4;
+
+bool ContainsSampler(const TType &type)
+{
+    if (IsSampler(type.getBasicType()))
+        return true;
+
+    if (type.getBasicType() == EbtStruct || type.isInterfaceBlock())
+    {
+        const TFieldList &fields = type.getStruct()->fields();
+        for (unsigned int i = 0; i < fields.size(); ++i)
+        {
+            if (ContainsSampler(*fields[i]->type()))
+                return true;
+        }
+    }
+
+    return false;
+}
+
+bool ContainsImage(const TType &type)
+{
+    if (IsImage(type.getBasicType()))
+        return true;
+
+    if (type.getBasicType() == EbtStruct || type.isInterfaceBlock())
+    {
+        const TFieldList &fields = type.getStruct()->fields();
+        for (unsigned int i = 0; i < fields.size(); ++i)
+        {
+            if (ContainsImage(*fields[i]->type()))
+                return true;
+        }
+    }
+
+    return false;
+}
+
+}  // namespace
+
+TParseContext::TParseContext(TSymbolTable &symt,
+                             TExtensionBehavior &ext,
+                             sh::GLenum type,
+                             ShShaderSpec spec,
+                             ShCompileOptions options,
+                             bool checksPrecErrors,
+                             TInfoSink &is,
+                             const ShBuiltInResources &resources)
+    : intermediate(),
+      symbolTable(symt),
+      mDeferredSingleDeclarationErrorCheck(false),
+      mShaderType(type),
+      mShaderSpec(spec),
+      mCompileOptions(options),
+      mShaderVersion(100),
+      mTreeRoot(nullptr),
+      mLoopNestingLevel(0),
+      mStructNestingLevel(0),
+      mSwitchNestingLevel(0),
+      mCurrentFunctionType(nullptr),
+      mFunctionReturnsValue(false),
+      mChecksPrecisionErrors(checksPrecErrors),
+      mFragmentPrecisionHighOnESSL1(false),
+      mDefaultMatrixPacking(EmpColumnMajor),
+      mDefaultBlockStorage(sh::IsWebGLBasedSpec(spec) ? EbsStd140 : EbsShared),
+      mDiagnostics(is),
+      mDirectiveHandler(ext,
+                        mDiagnostics,
+                        mShaderVersion,
+                        mShaderType,
+                        resources.WEBGL_debug_shader_precision == 1),
+      mPreprocessor(&mDiagnostics, &mDirectiveHandler),
+      mScanner(nullptr),
+      mUsesFragData(false),
+      mUsesFragColor(false),
+      mUsesSecondaryOutputs(false),
+      mMinProgramTexelOffset(resources.MinProgramTexelOffset),
+      mMaxProgramTexelOffset(resources.MaxProgramTexelOffset),
+      mComputeShaderLocalSizeDeclared(false),
+      mDeclaringFunction(false)
+{
+    mComputeShaderLocalSize.fill(-1);
+}
+
+//
+// Look at a '.' field selector string and change it into offsets
+// for a vector.
+//
+bool TParseContext::parseVectorFields(const TString &compString,
+                                      int vecSize,
+                                      TVectorFields &fields,
+                                      const TSourceLoc &line)
+{
+    fields.num = (int)compString.size();
+    if (fields.num > 4)
+    {
+        error(line, "illegal vector field selection", compString.c_str());
+        return false;
+    }
+
+    enum
+    {
+        exyzw,
+        ergba,
+        estpq
+    } fieldSet[4];
+
+    for (int i = 0; i < fields.num; ++i)
+    {
+        switch (compString[i])
+        {
+            case 'x':
+                fields.offsets[i] = 0;
+                fieldSet[i]       = exyzw;
+                break;
+            case 'r':
+                fields.offsets[i] = 0;
+                fieldSet[i]       = ergba;
+                break;
+            case 's':
+                fields.offsets[i] = 0;
+                fieldSet[i]       = estpq;
+                break;
+            case 'y':
+                fields.offsets[i] = 1;
+                fieldSet[i]       = exyzw;
+                break;
+            case 'g':
+                fields.offsets[i] = 1;
+                fieldSet[i]       = ergba;
+                break;
+            case 't':
+                fields.offsets[i] = 1;
+                fieldSet[i]       = estpq;
+                break;
+            case 'z':
+                fields.offsets[i] = 2;
+                fieldSet[i]       = exyzw;
+                break;
+            case 'b':
+                fields.offsets[i] = 2;
+                fieldSet[i]       = ergba;
+                break;
+            case 'p':
+                fields.offsets[i] = 2;
+                fieldSet[i]       = estpq;
+                break;
+
+            case 'w':
+                fields.offsets[i] = 3;
+                fieldSet[i]       = exyzw;
+                break;
+            case 'a':
+                fields.offsets[i] = 3;
+                fieldSet[i]       = ergba;
+                break;
+            case 'q':
+                fields.offsets[i] = 3;
+                fieldSet[i]       = estpq;
+                break;
+            default:
+                error(line, "illegal vector field selection", compString.c_str());
+                return false;
+        }
+    }
+
+    for (int i = 0; i < fields.num; ++i)
+    {
+        if (fields.offsets[i] >= vecSize)
+        {
+            error(line, "vector field selection out of range", compString.c_str());
+            return false;
+        }
+
+        if (i > 0)
+        {
+            if (fieldSet[i] != fieldSet[i - 1])
+            {
+                error(line, "illegal - vector component fields not from the same set",
+                      compString.c_str());
+                return false;
+            }
+        }
+    }
+
+    return true;
+}
+
+///////////////////////////////////////////////////////////////////////
+//
+// Errors
+//
+////////////////////////////////////////////////////////////////////////
+
+
+//
+// Used by flex/bison to output all syntax and parsing errors.
+//
+void TParseContext::error(const TSourceLoc &loc,
+                          const char *reason,
+                          const char *token,
+                          const char *extraInfo)
+{
+    mDiagnostics.error(loc, reason, token, extraInfo);
+}
+
+void TParseContext::warning(const TSourceLoc &loc,
+                            const char *reason,
+                            const char *token,
+                            const char *extraInfo)
+{
+    mDiagnostics.warning(loc, reason, token, extraInfo);
+}
+
+void TParseContext::outOfRangeError(bool isError,
+                                    const TSourceLoc &loc,
+                                    const char *reason,
+                                    const char *token,
+                                    const char *extraInfo)
+{
+    if (isError)
+    {
+        error(loc, reason, token, extraInfo);
+    }
+    else
+    {
+        warning(loc, reason, token, extraInfo);
+    }
+}
+
+//
+// Same error message for all places assignments don't work.
+//
+void TParseContext::assignError(const TSourceLoc &line, const char *op, TString left, TString right)
+{
+    std::stringstream extraInfoStream;
+    extraInfoStream << "cannot convert from '" << right << "' to '" << left << "'";
+    std::string extraInfo = extraInfoStream.str();
+    error(line, "", op, extraInfo.c_str());
+}
+
+//
+// Same error message for all places unary operations don't work.
+//
+void TParseContext::unaryOpError(const TSourceLoc &line, const char *op, TString operand)
+{
+    std::stringstream extraInfoStream;
+    extraInfoStream << "no operation '" << op << "' exists that takes an operand of type "
+                    << operand << " (or there is no acceptable conversion)";
+    std::string extraInfo = extraInfoStream.str();
+    error(line, " wrong operand type", op, extraInfo.c_str());
+}
+
+//
+// Same error message for all binary operations don't work.
+//
+void TParseContext::binaryOpError(const TSourceLoc &line,
+                                  const char *op,
+                                  TString left,
+                                  TString right)
+{
+    std::stringstream extraInfoStream;
+    extraInfoStream << "no operation '" << op << "' exists that takes a left-hand operand of type '"
+                    << left << "' and a right operand of type '" << right
+                    << "' (or there is no acceptable conversion)";
+    std::string extraInfo = extraInfoStream.str();
+    error(line, " wrong operand types ", op, extraInfo.c_str());
+}
+
+void TParseContext::checkPrecisionSpecified(const TSourceLoc &line,
+                                            TPrecision precision,
+                                            TBasicType type)
+{
+    if (!mChecksPrecisionErrors)
+        return;
+
+    if (precision != EbpUndefined && !SupportsPrecision(type))
+    {
+        error(line, "illegal type for precision qualifier", getBasicString(type));
+    }
+
+    if (precision == EbpUndefined)
+    {
+        switch (type)
+        {
+            case EbtFloat:
+                error(line, "No precision specified for (float)", "");
+                return;
+            case EbtInt:
+            case EbtUInt:
+                UNREACHABLE();  // there's always a predeclared qualifier
+                error(line, "No precision specified (int)", "");
+                return;
+            default:
+                if (IsSampler(type))
+                {
+                    error(line, "No precision specified (sampler)", "");
+                    return;
+                }
+                if (IsImage(type))
+                {
+                    error(line, "No precision specified (image)", "");
+                    return;
+                }
+        }
+    }
+}
+
+// Both test and if necessary, spit out an error, to see if the node is really
+// an l-value that can be operated on this way.
+bool TParseContext::checkCanBeLValue(const TSourceLoc &line, const char *op, TIntermTyped *node)
+{
+    TIntermSymbol *symNode    = node->getAsSymbolNode();
+    TIntermBinary *binaryNode = node->getAsBinaryNode();
+    TIntermSwizzle *swizzleNode = node->getAsSwizzleNode();
+
+    if (swizzleNode)
+    {
+        bool ok = checkCanBeLValue(line, op, swizzleNode->getOperand());
+        if (ok && swizzleNode->hasDuplicateOffsets())
+        {
+            error(line, " l-value of swizzle cannot have duplicate components", op);
+            return false;
+        }
+        return ok;
+    }
+
+    if (binaryNode)
+    {
+        switch (binaryNode->getOp())
+        {
+            case EOpIndexDirect:
+            case EOpIndexIndirect:
+            case EOpIndexDirectStruct:
+            case EOpIndexDirectInterfaceBlock:
+                return checkCanBeLValue(line, op, binaryNode->getLeft());
+            default:
+                break;
+        }
+        error(line, " l-value required", op);
+        return false;
+    }
+
+    const char *symbol = 0;
+    if (symNode != 0)
+        symbol = symNode->getSymbol().c_str();
+
+    const char *message = 0;
+    switch (node->getQualifier())
+    {
+        case EvqConst:
+            message = "can't modify a const";
+            break;
+        case EvqConstReadOnly:
+            message = "can't modify a const";
+            break;
+        case EvqAttribute:
+            message = "can't modify an attribute";
+            break;
+        case EvqFragmentIn:
+            message = "can't modify an input";
+            break;
+        case EvqVertexIn:
+            message = "can't modify an input";
+            break;
+        case EvqUniform:
+            message = "can't modify a uniform";
+            break;
+        case EvqVaryingIn:
+            message = "can't modify a varying";
+            break;
+        case EvqFragCoord:
+            message = "can't modify gl_FragCoord";
+            break;
+        case EvqFrontFacing:
+            message = "can't modify gl_FrontFacing";
+            break;
+        case EvqPointCoord:
+            message = "can't modify gl_PointCoord";
+            break;
+        case EvqNumWorkGroups:
+            message = "can't modify gl_NumWorkGroups";
+            break;
+        case EvqWorkGroupSize:
+            message = "can't modify gl_WorkGroupSize";
+            break;
+        case EvqWorkGroupID:
+            message = "can't modify gl_WorkGroupID";
+            break;
+        case EvqLocalInvocationID:
+            message = "can't modify gl_LocalInvocationID";
+            break;
+        case EvqGlobalInvocationID:
+            message = "can't modify gl_GlobalInvocationID";
+            break;
+        case EvqLocalInvocationIndex:
+            message = "can't modify gl_LocalInvocationIndex";
+            break;
+        case EvqComputeIn:
+            message = "can't modify work group size variable";
+            break;
+        default:
+            //
+            // Type that can't be written to?
+            //
+            if (node->getBasicType() == EbtVoid)
+            {
+                message = "can't modify void";
+            }
+            if (IsSampler(node->getBasicType()))
+            {
+                message = "can't modify a sampler";
+            }
+            if (IsImage(node->getBasicType()))
+            {
+                message = "can't modify an image";
+            }
+    }
+
+    if (message == 0 && binaryNode == 0 && symNode == 0)
+    {
+        error(line, " l-value required", op);
+
+        return false;
+    }
+
+    //
+    // Everything else is okay, no error.
+    //
+    if (message == 0)
+        return true;
+
+    //
+    // If we get here, we have an error and a message.
+    //
+    if (symNode)
+    {
+        std::stringstream extraInfoStream;
+        extraInfoStream << "\"" << symbol << "\" (" << message << ")";
+        std::string extraInfo = extraInfoStream.str();
+        error(line, " l-value required", op, extraInfo.c_str());
+    }
+    else
+    {
+        std::stringstream extraInfoStream;
+        extraInfoStream << "(" << message << ")";
+        std::string extraInfo = extraInfoStream.str();
+        error(line, " l-value required", op, extraInfo.c_str());
+    }
+
+    return false;
+}
+
+// Both test, and if necessary spit out an error, to see if the node is really
+// a constant.
+void TParseContext::checkIsConst(TIntermTyped *node)
+{
+    if (node->getQualifier() != EvqConst)
+    {
+        error(node->getLine(), "constant expression required", "");
+    }
+}
+
+// Both test, and if necessary spit out an error, to see if the node is really
+// an integer.
+void TParseContext::checkIsScalarInteger(TIntermTyped *node, const char *token)
+{
+    if (!node->isScalarInt())
+    {
+        error(node->getLine(), "integer expression required", token);
+    }
+}
+
+// Both test, and if necessary spit out an error, to see if we are currently
+// globally scoped.
+bool TParseContext::checkIsAtGlobalLevel(const TSourceLoc &line, const char *token)
+{
+    if (!symbolTable.atGlobalLevel())
+    {
+        error(line, "only allowed at global scope", token);
+        return false;
+    }
+    return true;
+}
+
+// For now, keep it simple:  if it starts "gl_", it's reserved, independent
+// of scope.  Except, if the symbol table is at the built-in push-level,
+// which is when we are parsing built-ins.
+// Also checks for "webgl_" and "_webgl_" reserved identifiers if parsing a
+// webgl shader.
+bool TParseContext::checkIsNotReserved(const TSourceLoc &line, const TString &identifier)
+{
+    static const char *reservedErrMsg = "reserved built-in name";
+    if (!symbolTable.atBuiltInLevel())
+    {
+        if (identifier.compare(0, 3, "gl_") == 0)
+        {
+            error(line, reservedErrMsg, "gl_");
+            return false;
+        }
+        if (sh::IsWebGLBasedSpec(mShaderSpec))
+        {
+            if (identifier.compare(0, 6, "webgl_") == 0)
+            {
+                error(line, reservedErrMsg, "webgl_");
+                return false;
+            }
+            if (identifier.compare(0, 7, "_webgl_") == 0)
+            {
+                error(line, reservedErrMsg, "_webgl_");
+                return false;
+            }
+        }
+        if (identifier.find("__") != TString::npos)
+        {
+            error(line,
+                  "identifiers containing two consecutive underscores (__) are reserved as "
+                  "possible future keywords",
+                  identifier.c_str());
+            return false;
+        }
+    }
+
+    return true;
+}
+
+// Make sure there is enough data provided to the constructor to build
+// something of the type of the constructor.  Also returns the type of
+// the constructor.
+bool TParseContext::checkConstructorArguments(const TSourceLoc &line,
+                                              TIntermNode *argumentsNode,
+                                              const TFunction &function,
+                                              TOperator op,
+                                              const TType &type)
+{
+    bool constructingMatrix = false;
+    switch (op)
+    {
+        case EOpConstructMat2:
+        case EOpConstructMat2x3:
+        case EOpConstructMat2x4:
+        case EOpConstructMat3x2:
+        case EOpConstructMat3:
+        case EOpConstructMat3x4:
+        case EOpConstructMat4x2:
+        case EOpConstructMat4x3:
+        case EOpConstructMat4:
+            constructingMatrix = true;
+            break;
+        default:
+            break;
+    }
+
+    //
+    // Note: It's okay to have too many components available, but not okay to have unused
+    // arguments.  'full' will go to true when enough args have been seen.  If we loop
+    // again, there is an extra argument, so 'overfull' will become true.
+    //
+
+    size_t size         = 0;
+    bool full           = false;
+    bool overFull       = false;
+    bool matrixInMatrix = false;
+    bool arrayArg = false;
+    for (size_t i = 0; i < function.getParamCount(); ++i)
+    {
+        const TConstParameter &param = function.getParam(i);
+        size += param.type->getObjectSize();
+
+        if (constructingMatrix && param.type->isMatrix())
+            matrixInMatrix = true;
+        if (full)
+            overFull = true;
+        if (op != EOpConstructStruct && !type.isArray() && size >= type.getObjectSize())
+            full = true;
+        if (param.type->isArray())
+            arrayArg = true;
+    }
+
+    if (type.isArray())
+    {
+        // The size of an unsized constructor should already have been determined.
+        ASSERT(!type.isUnsizedArray());
+        if (static_cast<size_t>(type.getArraySize()) != function.getParamCount())
+        {
+            error(line, "array constructor needs one argument per array element", "constructor");
+            return false;
+        }
+    }
+
+    if (arrayArg && op != EOpConstructStruct)
+    {
+        error(line, "constructing from a non-dereferenced array", "constructor");
+        return false;
+    }
+
+    if (matrixInMatrix && !type.isArray())
+    {
+        if (function.getParamCount() != 1)
+        {
+            error(line, "constructing matrix from matrix can only take one argument",
+                  "constructor");
+            return false;
+        }
+    }
+
+    if (overFull)
+    {
+        error(line, "too many arguments", "constructor");
+        return false;
+    }
+
+    if (op == EOpConstructStruct && !type.isArray() &&
+        type.getStruct()->fields().size() != function.getParamCount())
+    {
+        error(line,
+              "Number of constructor parameters does not match the number of structure fields",
+              "constructor");
+        return false;
+    }
+
+    if (!type.isMatrix() || !matrixInMatrix)
+    {
+        if ((op != EOpConstructStruct && size != 1 && size < type.getObjectSize()) ||
+            (op == EOpConstructStruct && size < type.getObjectSize()))
+        {
+            error(line, "not enough data provided for construction", "constructor");
+            return false;
+        }
+    }
+
+    if (argumentsNode == nullptr)
+    {
+        error(line, "constructor does not have any arguments", "constructor");
+        return false;
+    }
+
+    TIntermAggregate *argumentsAgg = argumentsNode->getAsAggregate();
+    for (TIntermNode *&argNode : *argumentsAgg->getSequence())
+    {
+        TIntermTyped *argTyped = argNode->getAsTyped();
+        ASSERT(argTyped != nullptr);
+        if (op != EOpConstructStruct && IsSampler(argTyped->getBasicType()))
+        {
+            error(line, "cannot convert a sampler", "constructor");
+            return false;
+        }
+        if (op != EOpConstructStruct && IsImage(argTyped->getBasicType()))
+        {
+            error(line, "cannot convert an image", "constructor");
+            return false;
+        }
+        if (argTyped->getBasicType() == EbtVoid)
+        {
+            error(line, "cannot convert a void", "constructor");
+            return false;
+        }
+    }
+
+    if (type.isArray())
+    {
+        // GLSL ES 3.00 section 5.4.4: Each argument must be the same type as the element type of
+        // the array.
+        for (TIntermNode *&argNode : *argumentsAgg->getSequence())
+        {
+            const TType &argType = argNode->getAsTyped()->getType();
+            // It has already been checked that the argument is not an array.
+            ASSERT(!argType.isArray());
+            if (!argType.sameElementType(type))
+            {
+                error(line, "Array constructor argument has an incorrect type", "Error");
+                return false;
+            }
+        }
+    }
+    else if (op == EOpConstructStruct)
+    {
+        const TFieldList &fields = type.getStruct()->fields();
+        TIntermSequence *args    = argumentsAgg->getSequence();
+
+        for (size_t i = 0; i < fields.size(); i++)
+        {
+            if (i >= args->size() || (*args)[i]->getAsTyped()->getType() != *fields[i]->type())
+            {
+                error(line, "Structure constructor arguments do not match structure fields",
+                      "Error");
+                return false;
+            }
+        }
+    }
+
+    return true;
+}
+
+// This function checks to see if a void variable has been declared and raise an error message for
+// such a case
+//
+// returns true in case of an error
+//
+bool TParseContext::checkIsNonVoid(const TSourceLoc &line,
+                                   const TString &identifier,
+                                   const TBasicType &type)
+{
+    if (type == EbtVoid)
+    {
+        error(line, "illegal use of type 'void'", identifier.c_str());
+        return false;
+    }
+
+    return true;
+}
+
+// This function checks to see if the node (for the expression) contains a scalar boolean expression
+// or not.
+void TParseContext::checkIsScalarBool(const TSourceLoc &line, const TIntermTyped *type)
+{
+    if (type->getBasicType() != EbtBool || type->isArray() || type->isMatrix() || type->isVector())
+    {
+        error(line, "boolean expression expected", "");
+    }
+}
+
+// This function checks to see if the node (for the expression) contains a scalar boolean expression
+// or not.
+void TParseContext::checkIsScalarBool(const TSourceLoc &line, const TPublicType &pType)
+{
+    if (pType.getBasicType() != EbtBool || pType.isAggregate())
+    {
+        error(line, "boolean expression expected", "");
+    }
+}
+
+bool TParseContext::checkIsNotSampler(const TSourceLoc &line,
+                                      const TTypeSpecifierNonArray &pType,
+                                      const char *reason)
+{
+    if (pType.type == EbtStruct)
+    {
+        if (ContainsSampler(*pType.userDef))
+        {
+            error(line, reason, getBasicString(pType.type), "(structure contains a sampler)");
+            return false;
+        }
+
+        return true;
+    }
+    else if (IsSampler(pType.type))
+    {
+        error(line, reason, getBasicString(pType.type));
+        return false;
+    }
+
+    return true;
+}
+
+bool TParseContext::checkIsNotImage(const TSourceLoc &line,
+                                    const TTypeSpecifierNonArray &pType,
+                                    const char *reason)
+{
+    if (pType.type == EbtStruct)
+    {
+        if (ContainsImage(*pType.userDef))
+        {
+            error(line, reason, getBasicString(pType.type), "(structure contains an image)");
+
+            return false;
+        }
+
+        return true;
+    }
+    else if (IsImage(pType.type))
+    {
+        error(line, reason, getBasicString(pType.type));
+
+        return false;
+    }
+
+    return true;
+}
+
+void TParseContext::checkDeclaratorLocationIsNotSpecified(const TSourceLoc &line,
+                                                          const TPublicType &pType)
+{
+    if (pType.layoutQualifier.location != -1)
+    {
+        error(line, "location must only be specified for a single input or output variable",
+              "location");
+    }
+}
+
+void TParseContext::checkLocationIsNotSpecified(const TSourceLoc &location,
+                                                const TLayoutQualifier &layoutQualifier)
+{
+    if (layoutQualifier.location != -1)
+    {
+        error(location, "invalid layout qualifier:", "location",
+              "only valid on program inputs and outputs");
+    }
+}
+
+void TParseContext::checkOutParameterIsNotOpaqueType(const TSourceLoc &line,
+                                                     TQualifier qualifier,
+                                                     const TType &type)
+{
+    checkOutParameterIsNotSampler(line, qualifier, type);
+    checkOutParameterIsNotImage(line, qualifier, type);
+}
+
+void TParseContext::checkOutParameterIsNotSampler(const TSourceLoc &line,
+                                                  TQualifier qualifier,
+                                                  const TType &type)
+{
+    ASSERT(qualifier == EvqOut || qualifier == EvqInOut);
+    if (IsSampler(type.getBasicType()))
+    {
+        error(line, "samplers cannot be output parameters", type.getBasicString());
+    }
+}
+
+void TParseContext::checkOutParameterIsNotImage(const TSourceLoc &line,
+                                                TQualifier qualifier,
+                                                const TType &type)
+{
+    ASSERT(qualifier == EvqOut || qualifier == EvqInOut);
+    if (IsImage(type.getBasicType()))
+    {
+        error(line, "images cannot be output parameters", type.getBasicString());
+    }
+}
+
+// Do size checking for an array type's size.
+unsigned int TParseContext::checkIsValidArraySize(const TSourceLoc &line, TIntermTyped *expr)
+{
+    TIntermConstantUnion *constant = expr->getAsConstantUnion();
+
+    // TODO(oetuaho@nvidia.com): Get rid of the constant == nullptr check here once all constant
+    // expressions can be folded. Right now we don't allow constant expressions that ANGLE can't
+    // fold as array size.
+    if (expr->getQualifier() != EvqConst || constant == nullptr || !constant->isScalarInt())
+    {
+        error(line, "array size must be a constant integer expression", "");
+        return 1u;
+    }
+
+    unsigned int size = 0u;
+
+    if (constant->getBasicType() == EbtUInt)
+    {
+        size = constant->getUConst(0);
+    }
+    else
+    {
+        int signedSize = constant->getIConst(0);
+
+        if (signedSize < 0)
+        {
+            error(line, "array size must be non-negative", "");
+            return 1u;
+        }
+
+        size = static_cast<unsigned int>(signedSize);
+    }
+
+    if (size == 0u)
+    {
+        error(line, "array size must be greater than zero", "");
+        return 1u;
+    }
+
+    // The size of arrays is restricted here to prevent issues further down the
+    // compiler/translator/driver stack. Shader Model 5 generation hardware is limited to
+    // 4096 registers so this should be reasonable even for aggressively optimizable code.
+    const unsigned int sizeLimit = 65536;
+
+    if (size > sizeLimit)
+    {
+        error(line, "array size too large", "");
+        return 1u;
+    }
+
+    return size;
+}
+
+// See if this qualifier can be an array.
+bool TParseContext::checkIsValidQualifierForArray(const TSourceLoc &line,
+                                                  const TPublicType &elementQualifier)
+{
+    if ((elementQualifier.qualifier == EvqAttribute) ||
+        (elementQualifier.qualifier == EvqVertexIn) ||
+        (elementQualifier.qualifier == EvqConst && mShaderVersion < 300))
+    {
+        error(line, "cannot declare arrays of this qualifier",
+              TType(elementQualifier).getQualifierString());
+        return false;
+    }
+
+    return true;
+}
+
+// See if this element type can be formed into an array.
+bool TParseContext::checkIsValidTypeForArray(const TSourceLoc &line, const TPublicType &elementType)
+{
+    //
+    // Can the type be an array?
+    //
+    if (elementType.array)
+    {
+        error(line, "cannot declare arrays of arrays",
+              TType(elementType).getCompleteString().c_str());
+        return false;
+    }
+    // In ESSL1.00 shaders, structs cannot be varying (section 4.3.5). This is checked elsewhere.
+    // In ESSL3.00 shaders, struct inputs/outputs are allowed but not arrays of structs (section
+    // 4.3.4).
+    if (mShaderVersion >= 300 && elementType.getBasicType() == EbtStruct &&
+        sh::IsVarying(elementType.qualifier))
+    {
+        error(line, "cannot declare arrays of structs of this qualifier",
+              TType(elementType).getCompleteString().c_str());
+        return false;
+    }
+
+    return true;
+}
+
+// Check if this qualified element type can be formed into an array.
+bool TParseContext::checkIsValidTypeAndQualifierForArray(const TSourceLoc &indexLocation,
+                                                         const TPublicType &elementType)
+{
+    if (checkIsValidTypeForArray(indexLocation, elementType))
+    {
+        return checkIsValidQualifierForArray(indexLocation, elementType);
+    }
+    return false;
+}
+
+// Enforce non-initializer type/qualifier rules.
+void TParseContext::checkCanBeDeclaredWithoutInitializer(const TSourceLoc &line,
+                                                         const TString &identifier,
+                                                         TPublicType *type)
+{
+    ASSERT(type != nullptr);
+    if (type->qualifier == EvqConst)
+    {
+        // Make the qualifier make sense.
+        type->qualifier = EvqTemporary;
+
+        // Generate informative error messages for ESSL1.
+        // In ESSL3 arrays and structures containing arrays can be constant.
+        if (mShaderVersion < 300 && type->isStructureContainingArrays())
+        {
+            error(line,
+                  "structures containing arrays may not be declared constant since they cannot be "
+                  "initialized",
+                  identifier.c_str());
+        }
+        else
+        {
+            error(line, "variables with qualifier 'const' must be initialized", identifier.c_str());
+        }
+        return;
+    }
+    if (type->isUnsizedArray())
+    {
+        error(line, "implicitly sized arrays need to be initialized", identifier.c_str());
+    }
+}
+
+// Do some simple checks that are shared between all variable declarations,
+// and update the symbol table.
+//
+// Returns true if declaring the variable succeeded.
+//
+bool TParseContext::declareVariable(const TSourceLoc &line,
+                                    const TString &identifier,
+                                    const TType &type,
+                                    TVariable **variable)
+{
+    ASSERT((*variable) == nullptr);
+
+    bool needsReservedCheck = true;
+
+    // gl_LastFragData may be redeclared with a new precision qualifier
+    if (type.isArray() && identifier.compare(0, 15, "gl_LastFragData") == 0)
+    {
+        const TVariable *maxDrawBuffers = static_cast<const TVariable *>(
+            symbolTable.findBuiltIn("gl_MaxDrawBuffers", mShaderVersion));
+        if (static_cast<int>(type.getArraySize()) == maxDrawBuffers->getConstPointer()->getIConst())
+        {
+            if (TSymbol *builtInSymbol = symbolTable.findBuiltIn(identifier, mShaderVersion))
+            {
+                needsReservedCheck = !checkCanUseExtension(line, builtInSymbol->getExtension());
+            }
+        }
+        else
+        {
+            error(line, "redeclaration of gl_LastFragData with size != gl_MaxDrawBuffers",
+                  identifier.c_str());
+            return false;
+        }
+    }
+
+    if (needsReservedCheck && !checkIsNotReserved(line, identifier))
+        return false;
+
+    (*variable) = new TVariable(&identifier, type);
+    if (!symbolTable.declare(*variable))
+    {
+        error(line, "redefinition", identifier.c_str());
+        *variable = nullptr;
+        return false;
+    }
+
+    if (!checkIsNonVoid(line, identifier, type.getBasicType()))
+        return false;
+
+    return true;
+}
+
+void TParseContext::checkIsParameterQualifierValid(
+    const TSourceLoc &line,
+    const TTypeQualifierBuilder &typeQualifierBuilder,
+    TType *type)
+{
+    TTypeQualifier typeQualifier = typeQualifierBuilder.getParameterTypeQualifier(&mDiagnostics);
+
+    if (typeQualifier.qualifier == EvqOut || typeQualifier.qualifier == EvqInOut)
+    {
+        checkOutParameterIsNotOpaqueType(line, typeQualifier.qualifier, *type);
+    }
+
+    if (!IsImage(type->getBasicType()))
+    {
+        checkIsMemoryQualifierNotSpecified(typeQualifier.memoryQualifier, line);
+    }
+    else
+    {
+        type->setMemoryQualifier(typeQualifier.memoryQualifier);
+    }
+
+    type->setQualifier(typeQualifier.qualifier);
+
+    if (typeQualifier.precision != EbpUndefined)
+    {
+        type->setPrecision(typeQualifier.precision);
+    }
+}
+
+bool TParseContext::checkCanUseExtension(const TSourceLoc &line, const TString &extension)
+{
+    const TExtensionBehavior &extBehavior   = extensionBehavior();
+    TExtensionBehavior::const_iterator iter = extBehavior.find(extension.c_str());
+    if (iter == extBehavior.end())
+    {
+        error(line, "extension", extension.c_str(), "is not supported");
+        return false;
+    }
+    // In GLSL ES, an extension's default behavior is "disable".
+    if (iter->second == EBhDisable || iter->second == EBhUndefined)
+    {
+        error(line, "extension", extension.c_str(), "is disabled");
+        return false;
+    }
+    if (iter->second == EBhWarn)
+    {
+        warning(line, "extension", extension.c_str(), "is being used");
+        return true;
+    }
+
+    return true;
+}
+
+// These checks are common for all declarations starting a declarator list, and declarators that
+// follow an empty declaration.
+void TParseContext::singleDeclarationErrorCheck(const TPublicType &publicType,
+                                                const TSourceLoc &identifierLocation)
+{
+    switch (publicType.qualifier)
+    {
+        case EvqVaryingIn:
+        case EvqVaryingOut:
+        case EvqAttribute:
+        case EvqVertexIn:
+        case EvqFragmentOut:
+        case EvqComputeIn:
+            if (publicType.getBasicType() == EbtStruct)
+            {
+                error(identifierLocation, "cannot be used with a structure",
+                      getQualifierString(publicType.qualifier));
+                return;
+            }
+
+        default:
+            break;
+    }
+
+    if (publicType.qualifier != EvqUniform &&
+        !checkIsNotSampler(identifierLocation, publicType.typeSpecifierNonArray,
+                           "samplers must be uniform"))
+    {
+        return;
+    }
+    if (publicType.qualifier != EvqUniform &&
+        !checkIsNotImage(identifierLocation, publicType.typeSpecifierNonArray,
+                         "images must be uniform"))
+    {
+        return;
+    }
+
+    // check for layout qualifier issues
+    const TLayoutQualifier layoutQualifier = publicType.layoutQualifier;
+
+    if (layoutQualifier.matrixPacking != EmpUnspecified)
+    {
+        error(identifierLocation, "layout qualifier",
+              getMatrixPackingString(layoutQualifier.matrixPacking),
+              "only valid for interface blocks");
+        return;
+    }
+
+    if (layoutQualifier.blockStorage != EbsUnspecified)
+    {
+        error(identifierLocation, "layout qualifier",
+              getBlockStorageString(layoutQualifier.blockStorage),
+              "only valid for interface blocks");
+        return;
+    }
+
+    if (publicType.qualifier != EvqVertexIn && publicType.qualifier != EvqFragmentOut)
+    {
+        checkLocationIsNotSpecified(identifierLocation, publicType.layoutQualifier);
+    }
+
+    if (IsImage(publicType.getBasicType()))
+    {
+
+        switch (layoutQualifier.imageInternalFormat)
+        {
+            case EiifRGBA32F:
+            case EiifRGBA16F:
+            case EiifR32F:
+            case EiifRGBA8:
+            case EiifRGBA8_SNORM:
+                if (!IsFloatImage(publicType.getBasicType()))
+                {
+                    error(identifierLocation,
+                          "internal image format requires a floating image type",
+                          getBasicString(publicType.getBasicType()));
+                    return;
+                }
+                break;
+            case EiifRGBA32I:
+            case EiifRGBA16I:
+            case EiifRGBA8I:
+            case EiifR32I:
+                if (!IsIntegerImage(publicType.getBasicType()))
+                {
+                    error(identifierLocation,
+                          "internal image format requires an integer image type",
+                          getBasicString(publicType.getBasicType()));
+                    return;
+                }
+                break;
+            case EiifRGBA32UI:
+            case EiifRGBA16UI:
+            case EiifRGBA8UI:
+            case EiifR32UI:
+                if (!IsUnsignedImage(publicType.getBasicType()))
+                {
+                    error(identifierLocation,
+                          "internal image format requires an unsigned image type",
+                          getBasicString(publicType.getBasicType()));
+                    return;
+                }
+                break;
+            case EiifUnspecified:
+                error(identifierLocation, "layout qualifier", "No image internal format specified");
+                return;
+            default:
+                error(identifierLocation, "layout qualifier", "unrecognized token");
+                return;
+        }
+
+        // GLSL ES 3.10 Revision 4, 4.9 Memory Access Qualifiers
+        switch (layoutQualifier.imageInternalFormat)
+        {
+            case EiifR32F:
+            case EiifR32I:
+            case EiifR32UI:
+                break;
+            default:
+                if (!publicType.memoryQualifier.readonly && !publicType.memoryQualifier.writeonly)
+                {
+                    error(identifierLocation, "layout qualifier",
+                          "Except for images with the r32f, r32i and r32ui format qualifiers, "
+                          "image variables must be qualified readonly and/or writeonly");
+                    return;
+                }
+                break;
+        }
+    }
+    else
+    {
+
+        if (!checkInternalFormatIsNotSpecified(identifierLocation,
+                                               layoutQualifier.imageInternalFormat))
+        {
+            return;
+        }
+
+        if (!checkIsMemoryQualifierNotSpecified(publicType.memoryQualifier, identifierLocation))
+        {
+            return;
+        }
+    }
+}
+
+void TParseContext::checkLayoutQualifierSupported(const TSourceLoc &location,
+                                                  const TString &layoutQualifierName,
+                                                  int versionRequired)
+{
+
+    if (mShaderVersion < versionRequired)
+    {
+        error(location, "invalid layout qualifier:", layoutQualifierName.c_str(), "not supported");
+    }
+}
+
+bool TParseContext::checkWorkGroupSizeIsNotSpecified(const TSourceLoc &location,
+                                                     const TLayoutQualifier &layoutQualifier)
+{
+    const sh::WorkGroupSize &localSize = layoutQualifier.localSize;
+    for (size_t i = 0u; i < localSize.size(); ++i)
+    {
+        if (localSize[i] != -1)
+        {
+            error(location, "invalid layout qualifier:", getWorkGroupSizeString(i),
+                  "only valid when used with 'in' in a compute shader global layout declaration");
+            return false;
+        }
+    }
+
+    return true;
+}
+
+bool TParseContext::checkInternalFormatIsNotSpecified(const TSourceLoc &location,
+                                                      TLayoutImageInternalFormat internalFormat)
+{
+    if (internalFormat != EiifUnspecified)
+    {
+        error(location, "invalid layout qualifier:", getImageInternalFormatString(internalFormat),
+              "only valid when used with images");
+        return false;
+    }
+    return true;
+}
+
+void TParseContext::functionCallLValueErrorCheck(const TFunction *fnCandidate,
+                                                 TIntermAggregate *fnCall)
+{
+    for (size_t i = 0; i < fnCandidate->getParamCount(); ++i)
+    {
+        TQualifier qual = fnCandidate->getParam(i).type->getQualifier();
+        if (qual == EvqOut || qual == EvqInOut)
+        {
+            TIntermTyped *argument = (*(fnCall->getSequence()))[i]->getAsTyped();
+            if (!checkCanBeLValue(argument->getLine(), "assign", argument))
+            {
+                error(argument->getLine(),
+                      "Constant value cannot be passed for 'out' or 'inout' parameters.", "Error");
+                return;
+            }
+        }
+    }
+}
+
+void TParseContext::checkInvariantVariableQualifier(bool invariant,
+                                                    const TQualifier qualifier,
+                                                    const TSourceLoc &invariantLocation)
+{
+    if (!invariant)
+        return;
+
+    if (mShaderVersion < 300)
+    {
+        // input variables in the fragment shader can be also qualified as invariant
+        if (!sh::CanBeInvariantESSL1(qualifier))
+        {
+            error(invariantLocation, "Cannot be qualified as invariant.", "invariant");
+        }
+    }
+    else
+    {
+        if (!sh::CanBeInvariantESSL3OrGreater(qualifier))
+        {
+            error(invariantLocation, "Cannot be qualified as invariant.", "invariant");
+        }
+    }
+}
+
+bool TParseContext::supportsExtension(const char *extension)
+{
+    const TExtensionBehavior &extbehavior   = extensionBehavior();
+    TExtensionBehavior::const_iterator iter = extbehavior.find(extension);
+    return (iter != extbehavior.end());
+}
+
+bool TParseContext::isExtensionEnabled(const char *extension) const
+{
+    return ::IsExtensionEnabled(extensionBehavior(), extension);
+}
+
+void TParseContext::handleExtensionDirective(const TSourceLoc &loc,
+                                             const char *extName,
+                                             const char *behavior)
+{
+    pp::SourceLocation srcLoc;
+    srcLoc.file = loc.first_file;
+    srcLoc.line = loc.first_line;
+    mDirectiveHandler.handleExtension(srcLoc, extName, behavior);
+}
+
+void TParseContext::handlePragmaDirective(const TSourceLoc &loc,
+                                          const char *name,
+                                          const char *value,
+                                          bool stdgl)
+{
+    pp::SourceLocation srcLoc;
+    srcLoc.file = loc.first_file;
+    srcLoc.line = loc.first_line;
+    mDirectiveHandler.handlePragma(srcLoc, name, value, stdgl);
+}
+
+sh::WorkGroupSize TParseContext::getComputeShaderLocalSize() const
+{
+    sh::WorkGroupSize result;
+    for (size_t i = 0u; i < result.size(); ++i)
+    {
+        if (mComputeShaderLocalSizeDeclared && mComputeShaderLocalSize[i] == -1)
+        {
+            result[i] = 1;
+        }
+        else
+        {
+            result[i] = mComputeShaderLocalSize[i];
+        }
+    }
+    return result;
+}
+
+/////////////////////////////////////////////////////////////////////////////////
+//
+// Non-Errors.
+//
+/////////////////////////////////////////////////////////////////////////////////
+
+const TVariable *TParseContext::getNamedVariable(const TSourceLoc &location,
+                                                 const TString *name,
+                                                 const TSymbol *symbol)
+{
+    const TVariable *variable = NULL;
+
+    if (!symbol)
+    {
+        error(location, "undeclared identifier", name->c_str());
+    }
+    else if (!symbol->isVariable())
+    {
+        error(location, "variable expected", name->c_str());
+    }
+    else
+    {
+        variable = static_cast<const TVariable *>(symbol);
+
+        if (symbolTable.findBuiltIn(variable->getName(), mShaderVersion) &&
+            !variable->getExtension().empty())
+        {
+            checkCanUseExtension(location, variable->getExtension());
+        }
+
+        // Reject shaders using both gl_FragData and gl_FragColor
+        TQualifier qualifier = variable->getType().getQualifier();
+        if (qualifier == EvqFragData || qualifier == EvqSecondaryFragDataEXT)
+        {
+            mUsesFragData = true;
+        }
+        else if (qualifier == EvqFragColor || qualifier == EvqSecondaryFragColorEXT)
+        {
+            mUsesFragColor = true;
+        }
+        if (qualifier == EvqSecondaryFragDataEXT || qualifier == EvqSecondaryFragColorEXT)
+        {
+            mUsesSecondaryOutputs = true;
+        }
+
+        // This validation is not quite correct - it's only an error to write to
+        // both FragData and FragColor. For simplicity, and because users shouldn't
+        // be rewarded for reading from undefined varaibles, return an error
+        // if they are both referenced, rather than assigned.
+        if (mUsesFragData && mUsesFragColor)
+        {
+            const char *errorMessage = "cannot use both gl_FragData and gl_FragColor";
+            if (mUsesSecondaryOutputs)
+            {
+                errorMessage =
+                    "cannot use both output variable sets (gl_FragData, gl_SecondaryFragDataEXT)"
+                    " and (gl_FragColor, gl_SecondaryFragColorEXT)";
+            }
+            error(location, errorMessage, name->c_str());
+        }
+
+        // GLSL ES 3.1 Revision 4, 7.1.3 Compute Shader Special Variables
+        if (getShaderType() == GL_COMPUTE_SHADER && !mComputeShaderLocalSizeDeclared &&
+            qualifier == EvqWorkGroupSize)
+        {
+            error(location,
+                  "It is an error to use gl_WorkGroupSize before declaring the local group size",
+                  "gl_WorkGroupSize");
+        }
+    }
+
+    if (!variable)
+    {
+        TType type(EbtFloat, EbpUndefined);
+        TVariable *fakeVariable = new TVariable(name, type);
+        symbolTable.declare(fakeVariable);
+        variable = fakeVariable;
+    }
+
+    return variable;
+}
+
+TIntermTyped *TParseContext::parseVariableIdentifier(const TSourceLoc &location,
+                                                     const TString *name,
+                                                     const TSymbol *symbol)
+{
+    const TVariable *variable = getNamedVariable(location, name, symbol);
+
+    if (variable->getConstPointer())
+    {
+        const TConstantUnion *constArray = variable->getConstPointer();
+        return intermediate.addConstantUnion(constArray, variable->getType(), location);
+    }
+    else
+    {
+        return intermediate.addSymbol(variable->getUniqueId(), variable->getName(),
+                                      variable->getType(), location);
+    }
+}
+
+//
+// Look up a function name in the symbol table, and make sure it is a function.
+//
+// Return the function symbol if found, otherwise 0.
+//
+const TFunction *TParseContext::findFunction(const TSourceLoc &line,
+                                             TFunction *call,
+                                             int inputShaderVersion,
+                                             bool *builtIn)
+{
+    // First find by unmangled name to check whether the function name has been
+    // hidden by a variable name or struct typename.
+    // If a function is found, check for one with a matching argument list.
+    const TSymbol *symbol = symbolTable.find(call->getName(), inputShaderVersion, builtIn);
+    if (symbol == 0 || symbol->isFunction())
+    {
+        symbol = symbolTable.find(call->getMangledName(), inputShaderVersion, builtIn);
+    }
+
+    if (symbol == 0)
+    {
+        error(line, "no matching overloaded function found", call->getName().c_str());
+        return 0;
+    }
+
+    if (!symbol->isFunction())
+    {
+        error(line, "function name expected", call->getName().c_str());
+        return 0;
+    }
+
+    return static_cast<const TFunction *>(symbol);
+}
+
+//
+// Initializers show up in several places in the grammar.  Have one set of
+// code to handle them here.
+//
+// Returns true on error, false if no error
+//
+bool TParseContext::executeInitializer(const TSourceLoc &line,
+                                       const TString &identifier,
+                                       const TPublicType &pType,
+                                       TIntermTyped *initializer,
+                                       TIntermBinary **initNode)
+{
+    ASSERT(initNode != nullptr);
+    ASSERT(*initNode == nullptr);
+    TType type = TType(pType);
+
+    TVariable *variable = nullptr;
+    if (type.isUnsizedArray())
+    {
+        // We have not checked yet whether the initializer actually is an array or not.
+        if (initializer->isArray())
+        {
+            type.setArraySize(initializer->getArraySize());
+        }
+        else
+        {
+            // Having a non-array initializer for an unsized array will result in an error later,
+            // so we don't generate an error message here.
+            type.setArraySize(1u);
+        }
+    }
+    if (!declareVariable(line, identifier, type, &variable))
+    {
+        return true;
+    }
+
+    bool globalInitWarning = false;
+    if (symbolTable.atGlobalLevel() &&
+        !ValidateGlobalInitializer(initializer, this, &globalInitWarning))
+    {
+        // Error message does not completely match behavior with ESSL 1.00, but
+        // we want to steer developers towards only using constant expressions.
+        error(line, "global variable initializers must be constant expressions", "=");
+        return true;
+    }
+    if (globalInitWarning)
+    {
+        warning(
+            line,
+            "global variable initializers should be constant expressions "
+            "(uniforms and globals are allowed in global initializers for legacy compatibility)",
+            "=");
+    }
+
+    //
+    // identifier must be of type constant, a global, or a temporary
+    //
+    TQualifier qualifier = variable->getType().getQualifier();
+    if ((qualifier != EvqTemporary) && (qualifier != EvqGlobal) && (qualifier != EvqConst))
+    {
+        error(line, " cannot initialize this type of qualifier ",
+              variable->getType().getQualifierString());
+        return true;
+    }
+    //
+    // test for and propagate constant
+    //
+
+    if (qualifier == EvqConst)
+    {
+        if (qualifier != initializer->getType().getQualifier())
+        {
+            std::stringstream extraInfoStream;
+            extraInfoStream << "'" << variable->getType().getCompleteString() << "'";
+            std::string extraInfo = extraInfoStream.str();
+            error(line, " assigning non-constant to", "=", extraInfo.c_str());
+            variable->getType().setQualifier(EvqTemporary);
+            return true;
+        }
+        if (type != initializer->getType())
+        {
+            error(line, " non-matching types for const initializer ",
+                  variable->getType().getQualifierString());
+            variable->getType().setQualifier(EvqTemporary);
+            return true;
+        }
+
+        // Save the constant folded value to the variable if possible. For example array
+        // initializers are not folded, since that way copying the array literal to multiple places
+        // in the shader is avoided.
+        // TODO(oetuaho@nvidia.com): Consider constant folding array initialization in cases where
+        // it would be beneficial.
+        if (initializer->getAsConstantUnion())
+        {
+            variable->shareConstPointer(initializer->getAsConstantUnion()->getUnionArrayPointer());
+            *initNode = nullptr;
+            return false;
+        }
+        else if (initializer->getAsSymbolNode())
+        {
+            const TSymbol *symbol =
+                symbolTable.find(initializer->getAsSymbolNode()->getSymbol(), 0);
+            const TVariable *tVar = static_cast<const TVariable *>(symbol);
+
+            const TConstantUnion *constArray = tVar->getConstPointer();
+            if (constArray)
+            {
+                variable->shareConstPointer(constArray);
+                *initNode = nullptr;
+                return false;
+            }
+        }
+    }
+
+    TIntermSymbol *intermSymbol = intermediate.addSymbol(
+        variable->getUniqueId(), variable->getName(), variable->getType(), line);
+    *initNode = createAssign(EOpInitialize, intermSymbol, initializer, line);
+    if (*initNode == nullptr)
+    {
+        assignError(line, "=", intermSymbol->getCompleteString(), initializer->getCompleteString());
+        return true;
+    }
+
+    return false;
+}
+
+void TParseContext::addFullySpecifiedType(TPublicType *typeSpecifier)
+{
+    checkPrecisionSpecified(typeSpecifier->getLine(), typeSpecifier->precision,
+                            typeSpecifier->getBasicType());
+
+    if (mShaderVersion < 300 && typeSpecifier->array)
+    {
+        error(typeSpecifier->getLine(), "not supported", "first-class array");
+        typeSpecifier->clearArrayness();
+    }
+}
+
+TPublicType TParseContext::addFullySpecifiedType(const TTypeQualifierBuilder &typeQualifierBuilder,
+                                                 const TPublicType &typeSpecifier)
+{
+    TTypeQualifier typeQualifier = typeQualifierBuilder.getVariableTypeQualifier(&mDiagnostics);
+
+    TPublicType returnType     = typeSpecifier;
+    returnType.qualifier       = typeQualifier.qualifier;
+    returnType.invariant       = typeQualifier.invariant;
+    returnType.layoutQualifier = typeQualifier.layoutQualifier;
+    returnType.memoryQualifier = typeQualifier.memoryQualifier;
+    returnType.precision       = typeSpecifier.precision;
+
+    if (typeQualifier.precision != EbpUndefined)
+    {
+        returnType.precision = typeQualifier.precision;
+    }
+
+    checkPrecisionSpecified(typeSpecifier.getLine(), returnType.precision,
+                            typeSpecifier.getBasicType());
+
+    checkInvariantVariableQualifier(returnType.invariant, returnType.qualifier,
+                                    typeSpecifier.getLine());
+
+    checkWorkGroupSizeIsNotSpecified(typeSpecifier.getLine(), returnType.layoutQualifier);
+
+    if (mShaderVersion < 300)
+    {
+        if (typeSpecifier.array)
+        {
+            error(typeSpecifier.getLine(), "not supported", "first-class array");
+            returnType.clearArrayness();
+        }
+
+        if (returnType.qualifier == EvqAttribute &&
+            (typeSpecifier.getBasicType() == EbtBool || typeSpecifier.getBasicType() == EbtInt))
+        {
+            error(typeSpecifier.getLine(), "cannot be bool or int",
+                  getQualifierString(returnType.qualifier));
+        }
+
+        if ((returnType.qualifier == EvqVaryingIn || returnType.qualifier == EvqVaryingOut) &&
+            (typeSpecifier.getBasicType() == EbtBool || typeSpecifier.getBasicType() == EbtInt))
+        {
+            error(typeSpecifier.getLine(), "cannot be bool or int",
+                  getQualifierString(returnType.qualifier));
+        }
+    }
+    else
+    {
+        if (!returnType.layoutQualifier.isEmpty())
+        {
+            checkIsAtGlobalLevel(typeSpecifier.getLine(), "layout");
+        }
+        if (sh::IsVarying(returnType.qualifier) || returnType.qualifier == EvqVertexIn ||
+            returnType.qualifier == EvqFragmentOut)
+        {
+            checkInputOutputTypeIsValidES3(returnType.qualifier, typeSpecifier,
+                                           typeSpecifier.getLine());
+        }
+        if (returnType.qualifier == EvqComputeIn)
+        {
+            error(typeSpecifier.getLine(), "'in' can be only used to specify the local group size",
+                  "in");
+        }
+    }
+
+    return returnType;
+}
+
+void TParseContext::checkInputOutputTypeIsValidES3(const TQualifier qualifier,
+                                                   const TPublicType &type,
+                                                   const TSourceLoc &qualifierLocation)
+{
+    // An input/output variable can never be bool or a sampler. Samplers are checked elsewhere.
+    if (type.getBasicType() == EbtBool)
+    {
+        error(qualifierLocation, "cannot be bool", getQualifierString(qualifier));
+    }
+
+    // Specific restrictions apply for vertex shader inputs and fragment shader outputs.
+    switch (qualifier)
+    {
+        case EvqVertexIn:
+            // ESSL 3.00 section 4.3.4
+            if (type.array)
+            {
+                error(qualifierLocation, "cannot be array", getQualifierString(qualifier));
+            }
+            // Vertex inputs with a struct type are disallowed in singleDeclarationErrorCheck
+            return;
+        case EvqFragmentOut:
+            // ESSL 3.00 section 4.3.6
+            if (type.typeSpecifierNonArray.isMatrix())
+            {
+                error(qualifierLocation, "cannot be matrix", getQualifierString(qualifier));
+            }
+            // Fragment outputs with a struct type are disallowed in singleDeclarationErrorCheck
+            return;
+        default:
+            break;
+    }
+
+    // Vertex shader outputs / fragment shader inputs have a different, slightly more lenient set of
+    // restrictions.
+    bool typeContainsIntegers =
+        (type.getBasicType() == EbtInt || type.getBasicType() == EbtUInt ||
+         type.isStructureContainingType(EbtInt) || type.isStructureContainingType(EbtUInt));
+    if (typeContainsIntegers && qualifier != EvqFlatIn && qualifier != EvqFlatOut)
+    {
+        error(qualifierLocation, "must use 'flat' interpolation here",
+              getQualifierString(qualifier));
+    }
+
+    if (type.getBasicType() == EbtStruct)
+    {
+        // ESSL 3.00 sections 4.3.4 and 4.3.6.
+        // These restrictions are only implied by the ESSL 3.00 spec, but
+        // the ESSL 3.10 spec lists these restrictions explicitly.
+        if (type.array)
+        {
+            error(qualifierLocation, "cannot be an array of structures",
+                  getQualifierString(qualifier));
+        }
+        if (type.isStructureContainingArrays())
+        {
+            error(qualifierLocation, "cannot be a structure containing an array",
+                  getQualifierString(qualifier));
+        }
+        if (type.isStructureContainingType(EbtStruct))
+        {
+            error(qualifierLocation, "cannot be a structure containing a structure",
+                  getQualifierString(qualifier));
+        }
+        if (type.isStructureContainingType(EbtBool))
+        {
+            error(qualifierLocation, "cannot be a structure containing a bool",
+                  getQualifierString(qualifier));
+        }
+    }
+}
+
+void TParseContext::checkLocalVariableConstStorageQualifier(const TQualifierWrapperBase &qualifier)
+{
+    if (qualifier.getType() == QtStorage)
+    {
+        const TStorageQualifierWrapper &storageQualifier =
+            static_cast<const TStorageQualifierWrapper &>(qualifier);
+        if (!declaringFunction() && storageQualifier.getQualifier() != EvqConst &&
+            !symbolTable.atGlobalLevel())
+        {
+            error(storageQualifier.getLine(),
+                  "Local variables can only use the const storage qualifier.",
+                  storageQualifier.getQualifierString().c_str());
+        }
+    }
+}
+
+bool TParseContext::checkIsMemoryQualifierNotSpecified(const TMemoryQualifier &memoryQualifier,
+                                                       const TSourceLoc &location)
+{
+    if (memoryQualifier.readonly)
+    {
+        error(location, "Only allowed with images.", "readonly");
+        return false;
+    }
+    if (memoryQualifier.writeonly)
+    {
+        error(location, "Only allowed with images.", "writeonly");
+        return false;
+    }
+    if (memoryQualifier.coherent)
+    {
+        error(location, "Only allowed with images.", "coherent");
+        return false;
+    }
+    if (memoryQualifier.restrictQualifier)
+    {
+        error(location, "Only allowed with images.", "restrict");
+        return false;
+    }
+    if (memoryQualifier.volatileQualifier)
+    {
+        error(location, "Only allowed with images.", "volatile");
+        return false;
+    }
+    return true;
+}
+
+TIntermDeclaration *TParseContext::parseSingleDeclaration(
+    TPublicType &publicType,
+    const TSourceLoc &identifierOrTypeLocation,
+    const TString &identifier)
+{
+    TType type(publicType);
+    if ((mCompileOptions & SH_FLATTEN_PRAGMA_STDGL_INVARIANT_ALL) &&
+        mDirectiveHandler.pragma().stdgl.invariantAll)
+    {
+        TQualifier qualifier = type.getQualifier();
+
+        // The directive handler has already taken care of rejecting invalid uses of this pragma
+        // (for example, in ESSL 3.00 fragment shaders), so at this point, flatten it into all
+        // affected variable declarations:
+        //
+        // 1. Built-in special variables which are inputs to the fragment shader. (These are handled
+        // elsewhere, in TranslatorGLSL.)
+        //
+        // 2. Outputs from vertex shaders in ESSL 1.00 and 3.00 (EvqVaryingOut and EvqVertexOut). It
+        // is actually less likely that there will be bugs in the handling of ESSL 3.00 shaders, but
+        // the way this is currently implemented we have to enable this compiler option before
+        // parsing the shader and determining the shading language version it uses. If this were
+        // implemented as a post-pass, the workaround could be more targeted.
+        //
+        // 3. Inputs in ESSL 1.00 fragment shaders (EvqVaryingIn). This is somewhat in violation of
+        // the specification, but there are desktop OpenGL drivers that expect that this is the
+        // behavior of the #pragma when specified in ESSL 1.00 fragment shaders.
+        if (qualifier == EvqVaryingOut || qualifier == EvqVertexOut || qualifier == EvqVaryingIn)
+        {
+            type.setInvariant(true);
+        }
+    }
+
+    TIntermSymbol *symbol = intermediate.addSymbol(0, identifier, type, identifierOrTypeLocation);
+
+    bool emptyDeclaration = (identifier == "");
+
+    mDeferredSingleDeclarationErrorCheck = emptyDeclaration;
+
+    TIntermDeclaration *declaration = new TIntermDeclaration();
+    declaration->setLine(identifierOrTypeLocation);
+
+    if (emptyDeclaration)
+    {
+        if (publicType.isUnsizedArray())
+        {
+            // ESSL3 spec section 4.1.9: Array declaration which leaves the size unspecified is an
+            // error. It is assumed that this applies to empty declarations as well.
+            error(identifierOrTypeLocation, "empty array declaration needs to specify a size",
+                  identifier.c_str());
+        }
+    }
+    else
+    {
+        singleDeclarationErrorCheck(publicType, identifierOrTypeLocation);
+
+        checkCanBeDeclaredWithoutInitializer(identifierOrTypeLocation, identifier, &publicType);
+
+        TVariable *variable = nullptr;
+        declareVariable(identifierOrTypeLocation, identifier, type, &variable);
+
+        if (variable && symbol)
+        {
+            symbol->setId(variable->getUniqueId());
+        }
+    }
+
+    // We append the symbol even if the declaration is empty, mainly because of struct declarations
+    // that may just declare a type.
+    declaration->appendDeclarator(symbol);
+
+    return declaration;
+}
+
+TIntermDeclaration *TParseContext::parseSingleArrayDeclaration(TPublicType &publicType,
+                                                               const TSourceLoc &identifierLocation,
+                                                               const TString &identifier,
+                                                               const TSourceLoc &indexLocation,
+                                                               TIntermTyped *indexExpression)
+{
+    mDeferredSingleDeclarationErrorCheck = false;
+
+    singleDeclarationErrorCheck(publicType, identifierLocation);
+
+    checkCanBeDeclaredWithoutInitializer(identifierLocation, identifier, &publicType);
+
+    checkIsValidTypeAndQualifierForArray(indexLocation, publicType);
+
+    TType arrayType(publicType);
+
+    unsigned int size = checkIsValidArraySize(identifierLocation, indexExpression);
+    // Make the type an array even if size check failed.
+    // This ensures useless error messages regarding the variable's non-arrayness won't follow.
+    arrayType.setArraySize(size);
+
+    TVariable *variable = nullptr;
+    declareVariable(identifierLocation, identifier, arrayType, &variable);
+
+    TIntermDeclaration *declaration = new TIntermDeclaration();
+    declaration->setLine(identifierLocation);
+
+    TIntermSymbol *symbol = intermediate.addSymbol(0, identifier, arrayType, identifierLocation);
+    if (variable && symbol)
+    {
+        symbol->setId(variable->getUniqueId());
+        declaration->appendDeclarator(symbol);
+    }
+
+    return declaration;
+}
+
+TIntermDeclaration *TParseContext::parseSingleInitDeclaration(const TPublicType &publicType,
+                                                              const TSourceLoc &identifierLocation,
+                                                              const TString &identifier,
+                                                              const TSourceLoc &initLocation,
+                                                              TIntermTyped *initializer)
+{
+    mDeferredSingleDeclarationErrorCheck = false;
+
+    singleDeclarationErrorCheck(publicType, identifierLocation);
+
+    TIntermDeclaration *declaration = new TIntermDeclaration();
+    declaration->setLine(identifierLocation);
+
+    TIntermBinary *initNode = nullptr;
+    if (!executeInitializer(identifierLocation, identifier, publicType, initializer, &initNode))
+    {
+        if (initNode)
+        {
+            declaration->appendDeclarator(initNode);
+        }
+    }
+    return declaration;
+}
+
+TIntermDeclaration *TParseContext::parseSingleArrayInitDeclaration(
+    TPublicType &publicType,
+    const TSourceLoc &identifierLocation,
+    const TString &identifier,
+    const TSourceLoc &indexLocation,
+    TIntermTyped *indexExpression,
+    const TSourceLoc &initLocation,
+    TIntermTyped *initializer)
+{
+    mDeferredSingleDeclarationErrorCheck = false;
+
+    singleDeclarationErrorCheck(publicType, identifierLocation);
+
+    checkIsValidTypeAndQualifierForArray(indexLocation, publicType);
+
+    TPublicType arrayType(publicType);
+
+    unsigned int size = 0u;
+    // If indexExpression is nullptr, then the array will eventually get its size implicitly from
+    // the initializer.
+    if (indexExpression != nullptr)
+    {
+        size = checkIsValidArraySize(identifierLocation, indexExpression);
+    }
+    // Make the type an array even if size check failed.
+    // This ensures useless error messages regarding the variable's non-arrayness won't follow.
+    arrayType.setArraySize(size);
+
+    TIntermDeclaration *declaration = new TIntermDeclaration();
+    declaration->setLine(identifierLocation);
+
+    // initNode will correspond to the whole of "type b[n] = initializer".
+    TIntermBinary *initNode = nullptr;
+    if (!executeInitializer(identifierLocation, identifier, arrayType, initializer, &initNode))
+    {
+        if (initNode)
+        {
+            declaration->appendDeclarator(initNode);
+        }
+    }
+
+    return declaration;
+}
+
+TIntermAggregate *TParseContext::parseInvariantDeclaration(
+    const TTypeQualifierBuilder &typeQualifierBuilder,
+    const TSourceLoc &identifierLoc,
+    const TString *identifier,
+    const TSymbol *symbol)
+{
+    TTypeQualifier typeQualifier = typeQualifierBuilder.getVariableTypeQualifier(&mDiagnostics);
+
+    if (!typeQualifier.invariant)
+    {
+        error(identifierLoc, "Expected invariant", identifier->c_str());
+        return nullptr;
+    }
+    if (!checkIsAtGlobalLevel(identifierLoc, "invariant varying"))
+    {
+        return nullptr;
+    }
+    if (!symbol)
+    {
+        error(identifierLoc, "undeclared identifier declared as invariant", identifier->c_str());
+        return nullptr;
+    }
+    if (!IsQualifierUnspecified(typeQualifier.qualifier))
+    {
+        error(identifierLoc, "invariant declaration specifies qualifier",
+              getQualifierString(typeQualifier.qualifier));
+    }
+    if (typeQualifier.precision != EbpUndefined)
+    {
+        error(identifierLoc, "invariant declaration specifies precision",
+              getPrecisionString(typeQualifier.precision));
+    }
+    if (!typeQualifier.layoutQualifier.isEmpty())
+    {
+        error(identifierLoc, "invariant declaration specifies layout", "'layout'");
+    }
+
+    const TVariable *variable = getNamedVariable(identifierLoc, identifier, symbol);
+    ASSERT(variable);
+    const TType &type = variable->getType();
+
+    checkInvariantVariableQualifier(typeQualifier.invariant, type.getQualifier(),
+                                    typeQualifier.line);
+    checkIsMemoryQualifierNotSpecified(typeQualifier.memoryQualifier, typeQualifier.line);
+
+    symbolTable.addInvariantVarying(std::string(identifier->c_str()));
+
+    TIntermSymbol *intermSymbol =
+        intermediate.addSymbol(variable->getUniqueId(), *identifier, type, identifierLoc);
+
+    TIntermAggregate *aggregate = TIntermediate::MakeAggregate(intermSymbol, identifierLoc);
+    aggregate->setOp(EOpInvariantDeclaration);
+    return aggregate;
+}
+
+void TParseContext::parseDeclarator(TPublicType &publicType,
+                                    const TSourceLoc &identifierLocation,
+                                    const TString &identifier,
+                                    TIntermDeclaration *declarationOut)
+{
+    // If the declaration starting this declarator list was empty (example: int,), some checks were
+    // not performed.
+    if (mDeferredSingleDeclarationErrorCheck)
+    {
+        singleDeclarationErrorCheck(publicType, identifierLocation);
+        mDeferredSingleDeclarationErrorCheck = false;
+    }
+
+    checkDeclaratorLocationIsNotSpecified(identifierLocation, publicType);
+
+    checkCanBeDeclaredWithoutInitializer(identifierLocation, identifier, &publicType);
+
+    TVariable *variable = nullptr;
+    declareVariable(identifierLocation, identifier, TType(publicType), &variable);
+
+    TIntermSymbol *symbol =
+        intermediate.addSymbol(0, identifier, TType(publicType), identifierLocation);
+    if (variable && symbol)
+    {
+        symbol->setId(variable->getUniqueId());
+        declarationOut->appendDeclarator(symbol);
+    }
+}
+
+void TParseContext::parseArrayDeclarator(TPublicType &publicType,
+                                         const TSourceLoc &identifierLocation,
+                                         const TString &identifier,
+                                         const TSourceLoc &arrayLocation,
+                                         TIntermTyped *indexExpression,
+                                         TIntermDeclaration *declarationOut)
+{
+    // If the declaration starting this declarator list was empty (example: int,), some checks were
+    // not performed.
+    if (mDeferredSingleDeclarationErrorCheck)
+    {
+        singleDeclarationErrorCheck(publicType, identifierLocation);
+        mDeferredSingleDeclarationErrorCheck = false;
+    }
+
+    checkDeclaratorLocationIsNotSpecified(identifierLocation, publicType);
+
+    checkCanBeDeclaredWithoutInitializer(identifierLocation, identifier, &publicType);
+
+    if (checkIsValidTypeAndQualifierForArray(arrayLocation, publicType))
+    {
+        TType arrayType = TType(publicType);
+        unsigned int size = checkIsValidArraySize(arrayLocation, indexExpression);
+        arrayType.setArraySize(size);
+
+        TVariable *variable = nullptr;
+        declareVariable(identifierLocation, identifier, arrayType, &variable);
+
+        TIntermSymbol *symbol =
+            intermediate.addSymbol(0, identifier, arrayType, identifierLocation);
+        if (variable && symbol)
+            symbol->setId(variable->getUniqueId());
+
+        declarationOut->appendDeclarator(symbol);
+    }
+}
+
+void TParseContext::parseInitDeclarator(const TPublicType &publicType,
+                                        const TSourceLoc &identifierLocation,
+                                        const TString &identifier,
+                                        const TSourceLoc &initLocation,
+                                        TIntermTyped *initializer,
+                                        TIntermDeclaration *declarationOut)
+{
+    // If the declaration starting this declarator list was empty (example: int,), some checks were
+    // not performed.
+    if (mDeferredSingleDeclarationErrorCheck)
+    {
+        singleDeclarationErrorCheck(publicType, identifierLocation);
+        mDeferredSingleDeclarationErrorCheck = false;
+    }
+
+    checkDeclaratorLocationIsNotSpecified(identifierLocation, publicType);
+
+    TIntermBinary *initNode = nullptr;
+    if (!executeInitializer(identifierLocation, identifier, publicType, initializer, &initNode))
+    {
+        //
+        // build the intermediate representation
+        //
+        if (initNode)
+        {
+            declarationOut->appendDeclarator(initNode);
+        }
+    }
+}
+
+void TParseContext::parseArrayInitDeclarator(const TPublicType &publicType,
+                                             const TSourceLoc &identifierLocation,
+                                             const TString &identifier,
+                                             const TSourceLoc &indexLocation,
+                                             TIntermTyped *indexExpression,
+                                             const TSourceLoc &initLocation,
+                                             TIntermTyped *initializer,
+                                             TIntermDeclaration *declarationOut)
+{
+    // If the declaration starting this declarator list was empty (example: int,), some checks were
+    // not performed.
+    if (mDeferredSingleDeclarationErrorCheck)
+    {
+        singleDeclarationErrorCheck(publicType, identifierLocation);
+        mDeferredSingleDeclarationErrorCheck = false;
+    }
+
+    checkDeclaratorLocationIsNotSpecified(identifierLocation, publicType);
+
+    checkIsValidTypeAndQualifierForArray(indexLocation, publicType);
+
+    TPublicType arrayType(publicType);
+
+    unsigned int size = 0u;
+    // If indexExpression is nullptr, then the array will eventually get its size implicitly from
+    // the initializer.
+    if (indexExpression != nullptr)
+    {
+        size = checkIsValidArraySize(identifierLocation, indexExpression);
+    }
+    // Make the type an array even if size check failed.
+    // This ensures useless error messages regarding the variable's non-arrayness won't follow.
+    arrayType.setArraySize(size);
+
+    // initNode will correspond to the whole of "b[n] = initializer".
+    TIntermBinary *initNode = nullptr;
+    if (!executeInitializer(identifierLocation, identifier, arrayType, initializer, &initNode))
+    {
+        if (initNode)
+        {
+            declarationOut->appendDeclarator(initNode);
+        }
+    }
+}
+
+void TParseContext::parseGlobalLayoutQualifier(const TTypeQualifierBuilder &typeQualifierBuilder)
+{
+    TTypeQualifier typeQualifier = typeQualifierBuilder.getVariableTypeQualifier(&mDiagnostics);
+    const TLayoutQualifier layoutQualifier = typeQualifier.layoutQualifier;
+
+    checkInvariantVariableQualifier(typeQualifier.invariant, typeQualifier.qualifier,
+                                    typeQualifier.line);
+
+    // It should never be the case, but some strange parser errors can send us here.
+    if (layoutQualifier.isEmpty())
+    {
+        error(typeQualifier.line, "Error during layout qualifier parsing.", "?");
+        return;
+    }
+
+    if (!layoutQualifier.isCombinationValid())
+    {
+        error(typeQualifier.line, "invalid combination:", "layout");
+        return;
+    }
+
+    checkIsMemoryQualifierNotSpecified(typeQualifier.memoryQualifier, typeQualifier.line);
+
+    checkInternalFormatIsNotSpecified(typeQualifier.line, layoutQualifier.imageInternalFormat);
+
+    if (typeQualifier.qualifier == EvqComputeIn)
+    {
+        if (mComputeShaderLocalSizeDeclared &&
+            !layoutQualifier.isLocalSizeEqual(mComputeShaderLocalSize))
+        {
+            error(typeQualifier.line, "Work group size does not match the previous declaration",
+                  "layout");
+            return;
+        }
+
+        if (mShaderVersion < 310)
+        {
+            error(typeQualifier.line, "in type qualifier supported in GLSL ES 3.10 only", "layout");
+            return;
+        }
+
+        if (!layoutQualifier.localSize.isAnyValueSet())
+        {
+            error(typeQualifier.line, "No local work group size specified", "layout");
+            return;
+        }
+
+        const TVariable *maxComputeWorkGroupSize = static_cast<const TVariable *>(
+            symbolTable.findBuiltIn("gl_MaxComputeWorkGroupSize", mShaderVersion));
+
+        const TConstantUnion *maxComputeWorkGroupSizeData =
+            maxComputeWorkGroupSize->getConstPointer();
+
+        for (size_t i = 0u; i < layoutQualifier.localSize.size(); ++i)
+        {
+            if (layoutQualifier.localSize[i] != -1)
+            {
+                mComputeShaderLocalSize[i]             = layoutQualifier.localSize[i];
+                const int maxComputeWorkGroupSizeValue = maxComputeWorkGroupSizeData[i].getIConst();
+                if (mComputeShaderLocalSize[i] < 1 ||
+                    mComputeShaderLocalSize[i] > maxComputeWorkGroupSizeValue)
+                {
+                    std::stringstream errorMessageStream;
+                    errorMessageStream << "Value must be at least 1 and no greater than "
+                                       << maxComputeWorkGroupSizeValue;
+                    const std::string &errorMessage = errorMessageStream.str();
+
+                    error(typeQualifier.line, "invalid value:", getWorkGroupSizeString(i),
+                          errorMessage.c_str());
+                    return;
+                }
+            }
+        }
+
+        mComputeShaderLocalSizeDeclared = true;
+    }
+    else
+    {
+
+        if (!checkWorkGroupSizeIsNotSpecified(typeQualifier.line, typeQualifier.layoutQualifier))
+        {
+            return;
+        }
+
+        if (typeQualifier.qualifier != EvqUniform)
+        {
+            error(typeQualifier.line, "invalid qualifier:",
+                  getQualifierString(typeQualifier.qualifier), "global layout must be uniform");
+            return;
+        }
+
+        if (mShaderVersion < 300)
+        {
+            error(typeQualifier.line, "layout qualifiers supported in GLSL ES 3.00 and above",
+                  "layout");
+            return;
+        }
+
+        checkLocationIsNotSpecified(typeQualifier.line, typeQualifier.layoutQualifier);
+
+        if (layoutQualifier.matrixPacking != EmpUnspecified)
+        {
+            mDefaultMatrixPacking = layoutQualifier.matrixPacking;
+        }
+
+        if (layoutQualifier.blockStorage != EbsUnspecified)
+        {
+            mDefaultBlockStorage = layoutQualifier.blockStorage;
+        }
+    }
+}
+
+TIntermAggregate *TParseContext::addFunctionPrototypeDeclaration(const TFunction &parsedFunction,
+                                                                 const TSourceLoc &location)
+{
+    // Note: function found from the symbol table could be the same as parsedFunction if this is the
+    // first declaration. Either way the instance in the symbol table is used to track whether the
+    // function is declared multiple times.
+    TFunction *function = static_cast<TFunction *>(
+        symbolTable.find(parsedFunction.getMangledName(), getShaderVersion()));
+    if (function->hasPrototypeDeclaration() && mShaderVersion == 100)
+    {
+        // ESSL 1.00.17 section 4.2.7.
+        // Doesn't apply to ESSL 3.00.4: see section 4.2.3.
+        error(location, "duplicate function prototype declarations are not allowed", "function");
+    }
+    function->setHasPrototypeDeclaration();
+
+    TIntermAggregate *prototype = new TIntermAggregate;
+    // TODO(oetuaho@nvidia.com): Instead of converting the function information here, the node could
+    // point to the data that already exists in the symbol table.
+    prototype->setType(function->getReturnType());
+    prototype->getFunctionSymbolInfo()->setFromFunction(*function);
+
+    for (size_t i = 0; i < function->getParamCount(); i++)
+    {
+        const TConstParameter &param = function->getParam(i);
+        if (param.name != 0)
+        {
+            TVariable variable(param.name, *param.type);
+
+            TIntermSymbol *paramSymbol = intermediate.addSymbol(
+                variable.getUniqueId(), variable.getName(), variable.getType(), location);
+            prototype = intermediate.growAggregate(prototype, paramSymbol, location);
+        }
+        else
+        {
+            TIntermSymbol *paramSymbol = intermediate.addSymbol(0, "", *param.type, location);
+            prototype                  = intermediate.growAggregate(prototype, paramSymbol, location);
+        }
+    }
+
+    prototype->setOp(EOpPrototype);
+
+    symbolTable.pop();
+
+    if (!symbolTable.atGlobalLevel())
+    {
+        // ESSL 3.00.4 section 4.2.4.
+        error(location, "local function prototype declarations are not allowed", "function");
+    }
+
+    return prototype;
+}
+
+TIntermFunctionDefinition *TParseContext::addFunctionDefinition(
+    const TFunction &function,
+    TIntermAggregate *functionParameters,
+    TIntermBlock *functionBody,
+    const TSourceLoc &location)
+{
+    // Check that non-void functions have at least one return statement.
+    if (mCurrentFunctionType->getBasicType() != EbtVoid && !mFunctionReturnsValue)
+    {
+        error(location, "function does not return a value:", "", function.getName().c_str());
+    }
+
+    if (functionBody == nullptr)
+    {
+        functionBody = new TIntermBlock();
+        functionBody->setLine(location);
+    }
+    TIntermFunctionDefinition *functionNode =
+        new TIntermFunctionDefinition(function.getReturnType(), functionParameters, functionBody);
+    functionNode->setLine(location);
+
+    functionNode->getFunctionSymbolInfo()->setFromFunction(function);
+
+    symbolTable.pop();
+    return functionNode;
+}
+
+void TParseContext::parseFunctionDefinitionHeader(const TSourceLoc &location,
+                                                  TFunction **function,
+                                                  TIntermAggregate **aggregateOut)
+{
+    ASSERT(function);
+    ASSERT(*function);
+    const TSymbol *builtIn =
+        symbolTable.findBuiltIn((*function)->getMangledName(), getShaderVersion());
+
+    if (builtIn)
+    {
+        error(location, "built-in functions cannot be redefined", (*function)->getName().c_str());
+    }
+    else
+    {
+        TFunction *prevDec = static_cast<TFunction *>(
+            symbolTable.find((*function)->getMangledName(), getShaderVersion()));
+
+        // Note: 'prevDec' could be 'function' if this is the first time we've seen function as it
+        // would have just been put in the symbol table. Otherwise, we're looking up an earlier
+        // occurance.
+        if (*function != prevDec)
+        {
+            // Swap the parameters of the previous declaration to the parameters of the function
+            // definition (parameter names may differ).
+            prevDec->swapParameters(**function);
+
+            // The function definition will share the same symbol as any previous declaration.
+            *function = prevDec;
+        }
+
+        if ((*function)->isDefined())
+        {
+            error(location, "function already has a body", (*function)->getName().c_str());
+        }
+
+        (*function)->setDefined();
+    }
+
+    // Raise error message if main function takes any parameters or return anything other than void
+    if ((*function)->getName() == "main")
+    {
+        if ((*function)->getParamCount() > 0)
+        {
+            error(location, "function cannot take any parameter(s)",
+                  (*function)->getName().c_str());
+        }
+        if ((*function)->getReturnType().getBasicType() != EbtVoid)
+        {
+            error(location, "", (*function)->getReturnType().getBasicString(),
+                  "main function cannot return a value");
+        }
+    }
+
+    //
+    // Remember the return type for later checking for RETURN statements.
+    //
+    mCurrentFunctionType  = &((*function)->getReturnType());
+    mFunctionReturnsValue = false;
+
+    //
+    // Insert parameters into the symbol table.
+    // If the parameter has no name, it's not an error, just don't insert it
+    // (could be used for unused args).
+    //
+    // Also, accumulate the list of parameters into the HIL, so lower level code
+    // knows where to find parameters.
+    //
+    TIntermAggregate *paramNodes = new TIntermAggregate;
+    for (size_t i = 0; i < (*function)->getParamCount(); i++)
+    {
+        const TConstParameter &param = (*function)->getParam(i);
+        if (param.name != 0)
+        {
+            TVariable *variable = new TVariable(param.name, *param.type);
+            //
+            // Insert the parameters with name in the symbol table.
+            //
+            if (!symbolTable.declare(variable))
+            {
+                error(location, "redefinition", variable->getName().c_str());
+                paramNodes = intermediate.growAggregate(
+                    paramNodes, intermediate.addSymbol(0, "", *param.type, location), location);
+                continue;
+            }
+
+            //
+            // Add the parameter to the HIL
+            //
+            TIntermSymbol *symbol = intermediate.addSymbol(
+                variable->getUniqueId(), variable->getName(), variable->getType(), location);
+
+            paramNodes = intermediate.growAggregate(paramNodes, symbol, location);
+        }
+        else
+        {
+            paramNodes = intermediate.growAggregate(
+                paramNodes, intermediate.addSymbol(0, "", *param.type, location), location);
+        }
+    }
+    intermediate.setAggregateOperator(paramNodes, EOpParameters, location);
+    *aggregateOut = paramNodes;
+    setLoopNestingLevel(0);
+}
+
+TFunction *TParseContext::parseFunctionDeclarator(const TSourceLoc &location, TFunction *function)
+{
+    //
+    // We don't know at this point whether this is a function definition or a prototype.
+    // The definition production code will check for redefinitions.
+    // In the case of ESSL 1.00 the prototype production code will also check for redeclarations.
+    //
+    // Return types and parameter qualifiers must match in all redeclarations, so those are checked
+    // here.
+    //
+    TFunction *prevDec =
+        static_cast<TFunction *>(symbolTable.find(function->getMangledName(), getShaderVersion()));
+
+    if (getShaderVersion() >= 300 && symbolTable.hasUnmangledBuiltIn(function->getName().c_str()))
+    {
+        // With ESSL 3.00, names of built-in functions cannot be redeclared as functions.
+        // Therefore overloading or redefining builtin functions is an error.
+        error(location, "Name of a built-in function cannot be redeclared as function",
+              function->getName().c_str());
+    }
+    else if (prevDec)
+    {
+        if (prevDec->getReturnType() != function->getReturnType())
+        {
+            error(location, "function must have the same return type in all of its declarations",
+                  function->getReturnType().getBasicString());
+        }
+        for (size_t i = 0; i < prevDec->getParamCount(); ++i)
+        {
+            if (prevDec->getParam(i).type->getQualifier() !=
+                function->getParam(i).type->getQualifier())
+            {
+                error(location,
+                      "function must have the same parameter qualifiers in all of its declarations",
+                      function->getParam(i).type->getQualifierString());
+            }
+        }
+    }
+
+    //
+    // Check for previously declared variables using the same name.
+    //
+    TSymbol *prevSym = symbolTable.find(function->getName(), getShaderVersion());
+    if (prevSym)
+    {
+        if (!prevSym->isFunction())
+        {
+            error(location, "redefinition", function->getName().c_str(), "function");
+        }
+    }
+    else
+    {
+        // Insert the unmangled name to detect potential future redefinition as a variable.
+        symbolTable.getOuterLevel()->insertUnmangled(function);
+    }
+
+    // We're at the inner scope level of the function's arguments and body statement.
+    // Add the function prototype to the surrounding scope instead.
+    symbolTable.getOuterLevel()->insert(function);
+
+    //
+    // If this is a redeclaration, it could also be a definition, in which case, we want to use the
+    // variable names from this one, and not the one that's
+    // being redeclared.  So, pass back up this declaration, not the one in the symbol table.
+    //
+    return function;
+}
+
+TFunction *TParseContext::parseFunctionHeader(const TPublicType &type,
+                                              const TString *name,
+                                              const TSourceLoc &location)
+{
+    if (type.qualifier != EvqGlobal && type.qualifier != EvqTemporary)
+    {
+        error(location, "no qualifiers allowed for function return",
+              getQualifierString(type.qualifier));
+    }
+    if (!type.layoutQualifier.isEmpty())
+    {
+        error(location, "no qualifiers allowed for function return", "layout");
+    }
+    // make sure a sampler or an image is not involved as well...
+    checkIsNotSampler(location, type.typeSpecifierNonArray,
+                      "samplers can't be function return values");
+    checkIsNotImage(location, type.typeSpecifierNonArray, "images can't be function return values");
+    if (mShaderVersion < 300)
+    {
+        // Array return values are forbidden, but there's also no valid syntax for declaring array
+        // return values in ESSL 1.00.
+        ASSERT(type.arraySize == 0 || mDiagnostics.numErrors() > 0);
+
+        if (type.isStructureContainingArrays())
+        {
+            // ESSL 1.00.17 section 6.1 Function Definitions
+            error(location, "structures containing arrays can't be function return values",
+                  TType(type).getCompleteString().c_str());
+        }
+    }
+
+    // Add the function as a prototype after parsing it (we do not support recursion)
+    return new TFunction(name, new TType(type));
+}
+
+TFunction *TParseContext::addConstructorFunc(const TPublicType &publicTypeIn)
+{
+    TPublicType publicType = publicTypeIn;
+    if (publicType.isStructSpecifier())
+    {
+        error(publicType.getLine(), "constructor can't be a structure definition",
+              getBasicString(publicType.getBasicType()));
+    }
+
+    TOperator op = EOpNull;
+    if (publicType.getUserDef())
+    {
+        op = EOpConstructStruct;
+    }
+    else
+    {
+        op = sh::TypeToConstructorOperator(TType(publicType));
+        if (op == EOpNull)
+        {
+            error(publicType.getLine(), "cannot construct this type",
+                  getBasicString(publicType.getBasicType()));
+            publicType.setBasicType(EbtFloat);
+            op              = EOpConstructFloat;
+        }
+    }
+
+    TString tempString;
+    const TType *type = new TType(publicType);
+    return new TFunction(&tempString, type, op);
+}
+
+// This function is used to test for the correctness of the parameters passed to various constructor
+// functions and also convert them to the right datatype if it is allowed and required.
+//
+// Returns a node to add to the tree regardless of if an error was generated or not.
+//
+TIntermTyped *TParseContext::addConstructor(TIntermNode *arguments,
+                                            TOperator op,
+                                            TFunction *fnCall,
+                                            const TSourceLoc &line)
+{
+    TType type = fnCall->getReturnType();
+    if (type.isUnsizedArray())
+    {
+        if (fnCall->getParamCount() == 0)
+        {
+            error(line, "implicitly sized array constructor must have at least one argument", "[]");
+            type.setArraySize(1u);
+            return TIntermTyped::CreateZero(type);
+        }
+        type.setArraySize(static_cast<unsigned int>(fnCall->getParamCount()));
+    }
+    bool constType = true;
+    for (size_t i = 0; i < fnCall->getParamCount(); ++i)
+    {
+        const TConstParameter &param = fnCall->getParam(i);
+        if (param.type->getQualifier() != EvqConst)
+            constType = false;
+    }
+    if (constType)
+        type.setQualifier(EvqConst);
+
+    if (!checkConstructorArguments(line, arguments, *fnCall, op, type))
+    {
+        TIntermTyped *dummyNode = intermediate.setAggregateOperator(nullptr, op, line);
+        dummyNode->setType(type);
+        return dummyNode;
+    }
+    TIntermAggregate *constructor = arguments->getAsAggregate();
+    ASSERT(constructor != nullptr);
+
+    // Turn the argument list itself into a constructor
+    constructor->setOp(op);
+    constructor->setLine(line);
+    ASSERT(constructor->isConstructor());
+
+    // Need to set type before setPrecisionFromChildren() because bool doesn't have precision.
+    constructor->setType(type);
+
+    // Structs should not be precision qualified, the individual members may be.
+    // Built-in types on the other hand should be precision qualified.
+    if (op != EOpConstructStruct)
+    {
+        constructor->setPrecisionFromChildren();
+        type.setPrecision(constructor->getPrecision());
+    }
+
+    constructor->setType(type);
+
+    TIntermTyped *constConstructor = intermediate.foldAggregateBuiltIn(constructor, &mDiagnostics);
+    if (constConstructor)
+    {
+        return constConstructor;
+    }
+
+    return constructor;
+}
+
+//
+// Interface/uniform blocks
+//
+TIntermDeclaration *TParseContext::addInterfaceBlock(
+    const TTypeQualifierBuilder &typeQualifierBuilder,
+    const TSourceLoc &nameLine,
+    const TString &blockName,
+    TFieldList *fieldList,
+    const TString *instanceName,
+    const TSourceLoc &instanceLine,
+    TIntermTyped *arrayIndex,
+    const TSourceLoc &arrayIndexLine)
+{
+    checkIsNotReserved(nameLine, blockName);
+
+    TTypeQualifier typeQualifier = typeQualifierBuilder.getVariableTypeQualifier(&mDiagnostics);
+
+    if (typeQualifier.qualifier != EvqUniform)
+    {
+        error(typeQualifier.line, "invalid qualifier:", getQualifierString(typeQualifier.qualifier),
+              "interface blocks must be uniform");
+    }
+
+    if (typeQualifier.invariant)
+    {
+        error(typeQualifier.line, "invalid qualifier on interface block member", "invariant");
+    }
+
+    checkIsMemoryQualifierNotSpecified(typeQualifier.memoryQualifier, typeQualifier.line);
+
+    TLayoutQualifier blockLayoutQualifier = typeQualifier.layoutQualifier;
+    checkLocationIsNotSpecified(typeQualifier.line, blockLayoutQualifier);
+
+    if (blockLayoutQualifier.matrixPacking == EmpUnspecified)
+    {
+        blockLayoutQualifier.matrixPacking = mDefaultMatrixPacking;
+    }
+
+    if (blockLayoutQualifier.blockStorage == EbsUnspecified)
+    {
+        blockLayoutQualifier.blockStorage = mDefaultBlockStorage;
+    }
+
+    checkWorkGroupSizeIsNotSpecified(nameLine, blockLayoutQualifier);
+
+    checkInternalFormatIsNotSpecified(nameLine, blockLayoutQualifier.imageInternalFormat);
+
+    TSymbol *blockNameSymbol = new TInterfaceBlockName(&blockName);
+    if (!symbolTable.declare(blockNameSymbol))
+    {
+        error(nameLine, "redefinition", blockName.c_str(), "interface block name");
+    }
+
+    // check for sampler types and apply layout qualifiers
+    for (size_t memberIndex = 0; memberIndex < fieldList->size(); ++memberIndex)
+    {
+        TField *field    = (*fieldList)[memberIndex];
+        TType *fieldType = field->type();
+        if (IsSampler(fieldType->getBasicType()))
+        {
+            error(field->line(), "unsupported type", fieldType->getBasicString(),
+                  "sampler types are not allowed in interface blocks");
+        }
+
+        if (IsImage(fieldType->getBasicType()))
+        {
+            error(field->line(), "unsupported type", fieldType->getBasicString(),
+                  "image types are not allowed in interface blocks");
+        }
+
+        const TQualifier qualifier = fieldType->getQualifier();
+        switch (qualifier)
+        {
+            case EvqGlobal:
+            case EvqUniform:
+                break;
+            default:
+                error(field->line(), "invalid qualifier on interface block member",
+                      getQualifierString(qualifier));
+                break;
+        }
+
+        if (fieldType->isInvariant())
+        {
+            error(field->line(), "invalid qualifier on interface block member", "invariant");
+        }
+
+        // check layout qualifiers
+        TLayoutQualifier fieldLayoutQualifier = fieldType->getLayoutQualifier();
+        checkLocationIsNotSpecified(field->line(), fieldLayoutQualifier);
+
+        if (fieldLayoutQualifier.blockStorage != EbsUnspecified)
+        {
+            error(field->line(), "invalid layout qualifier:",
+                  getBlockStorageString(fieldLayoutQualifier.blockStorage), "cannot be used here");
+        }
+
+        if (fieldLayoutQualifier.matrixPacking == EmpUnspecified)
+        {
+            fieldLayoutQualifier.matrixPacking = blockLayoutQualifier.matrixPacking;
+        }
+        else if (!fieldType->isMatrix() && fieldType->getBasicType() != EbtStruct)
+        {
+            warning(field->line(), "extraneous layout qualifier:",
+                    getMatrixPackingString(fieldLayoutQualifier.matrixPacking),
+                    "only has an effect on matrix types");
+        }
+
+        fieldType->setLayoutQualifier(fieldLayoutQualifier);
+    }
+
+    // add array index
+    unsigned int arraySize = 0;
+    if (arrayIndex != nullptr)
+    {
+        arraySize = checkIsValidArraySize(arrayIndexLine, arrayIndex);
+    }
+
+    TInterfaceBlock *interfaceBlock =
+        new TInterfaceBlock(&blockName, fieldList, instanceName, arraySize, blockLayoutQualifier);
+    TType interfaceBlockType(interfaceBlock, typeQualifier.qualifier, blockLayoutQualifier,
+                             arraySize);
+
+    TString symbolName = "";
+    int symbolId       = 0;
+
+    if (!instanceName)
+    {
+        // define symbols for the members of the interface block
+        for (size_t memberIndex = 0; memberIndex < fieldList->size(); ++memberIndex)
+        {
+            TField *field    = (*fieldList)[memberIndex];
+            TType *fieldType = field->type();
+
+            // set parent pointer of the field variable
+            fieldType->setInterfaceBlock(interfaceBlock);
+
+            TVariable *fieldVariable = new TVariable(&field->name(), *fieldType);
+            fieldVariable->setQualifier(typeQualifier.qualifier);
+
+            if (!symbolTable.declare(fieldVariable))
+            {
+                error(field->line(), "redefinition", field->name().c_str(),
+                      "interface block member name");
+            }
+        }
+    }
+    else
+    {
+        checkIsNotReserved(instanceLine, *instanceName);
+
+        // add a symbol for this interface block
+        TVariable *instanceTypeDef = new TVariable(instanceName, interfaceBlockType, false);
+        instanceTypeDef->setQualifier(typeQualifier.qualifier);
+
+        if (!symbolTable.declare(instanceTypeDef))
+        {
+            error(instanceLine, "redefinition", instanceName->c_str(),
+                  "interface block instance name");
+        }
+
+        symbolId   = instanceTypeDef->getUniqueId();
+        symbolName = instanceTypeDef->getName();
+    }
+
+    TIntermSymbol *blockSymbol =
+        intermediate.addSymbol(symbolId, symbolName, interfaceBlockType, typeQualifier.line);
+    TIntermDeclaration *declaration = new TIntermDeclaration();
+    declaration->appendDeclarator(blockSymbol);
+    declaration->setLine(nameLine);
+
+    exitStructDeclaration();
+    return declaration;
+}
+
+void TParseContext::enterStructDeclaration(const TSourceLoc &line, const TString &identifier)
+{
+    ++mStructNestingLevel;
+
+    // Embedded structure definitions are not supported per GLSL ES spec.
+    // They aren't allowed in GLSL either, but we need to detect this here
+    // so we don't rely on the GLSL compiler to catch it.
+    if (mStructNestingLevel > 1)
+    {
+        error(line, "", "Embedded struct definitions are not allowed");
+    }
+}
+
+void TParseContext::exitStructDeclaration()
+{
+    --mStructNestingLevel;
+}
+
+void TParseContext::checkIsBelowStructNestingLimit(const TSourceLoc &line, const TField &field)
+{
+    if (!sh::IsWebGLBasedSpec(mShaderSpec))
+    {
+        return;
+    }
+
+    if (field.type()->getBasicType() != EbtStruct)
+    {
+        return;
+    }
+
+    // We're already inside a structure definition at this point, so add
+    // one to the field's struct nesting.
+    if (1 + field.type()->getDeepestStructNesting() > kWebGLMaxStructNesting)
+    {
+        std::stringstream reasonStream;
+        reasonStream << "Reference of struct type " << field.type()->getStruct()->name().c_str()
+                     << " exceeds maximum allowed nesting level of " << kWebGLMaxStructNesting;
+        std::string reason = reasonStream.str();
+        error(line, reason.c_str(), field.name().c_str(), "");
+        return;
+    }
+}
+
+//
+// Parse an array index expression
+//
+TIntermTyped *TParseContext::addIndexExpression(TIntermTyped *baseExpression,
+                                                const TSourceLoc &location,
+                                                TIntermTyped *indexExpression)
+{
+    if (!baseExpression->isArray() && !baseExpression->isMatrix() && !baseExpression->isVector())
+    {
+        if (baseExpression->getAsSymbolNode())
+        {
+            error(location, " left of '[' is not of type array, matrix, or vector ",
+                  baseExpression->getAsSymbolNode()->getSymbol().c_str());
+        }
+        else
+        {
+            error(location, " left of '[' is not of type array, matrix, or vector ", "expression");
+        }
+
+        TConstantUnion *unionArray = new TConstantUnion[1];
+        unionArray->setFConst(0.0f);
+        return intermediate.addConstantUnion(unionArray, TType(EbtFloat, EbpHigh, EvqConst),
+                                             location);
+    }
+
+    TIntermConstantUnion *indexConstantUnion = indexExpression->getAsConstantUnion();
+
+    // TODO(oetuaho@nvidia.com): Get rid of indexConstantUnion == nullptr below once ANGLE is able
+    // to constant fold all constant expressions. Right now we don't allow indexing interface blocks
+    // or fragment outputs with expressions that ANGLE is not able to constant fold, even if the
+    // index is a constant expression.
+    if (indexExpression->getQualifier() != EvqConst || indexConstantUnion == nullptr)
+    {
+        if (baseExpression->isInterfaceBlock())
+        {
+            error(
+                location, "", "[",
+                "array indexes for interface blocks arrays must be constant integral expressions");
+        }
+        else if (baseExpression->getQualifier() == EvqFragmentOut)
+        {
+            error(location, "", "[",
+                  "array indexes for fragment outputs must be constant integral expressions");
+        }
+        else if (mShaderSpec == SH_WEBGL2_SPEC && baseExpression->getQualifier() == EvqFragData)
+        {
+            error(location, "", "[", "array index for gl_FragData must be constant zero");
+        }
+    }
+
+    if (indexConstantUnion)
+    {
+        // If an out-of-range index is not qualified as constant, the behavior in the spec is
+        // undefined. This applies even if ANGLE has been able to constant fold it (ANGLE may
+        // constant fold expressions that are not constant expressions). The most compatible way to
+        // handle this case is to report a warning instead of an error and force the index to be in
+        // the correct range.
+        bool outOfRangeIndexIsError = indexExpression->getQualifier() == EvqConst;
+        int index = indexConstantUnion->getIConst(0);
+
+        int safeIndex = -1;
+
+        if (baseExpression->isArray())
+        {
+            if (baseExpression->getQualifier() == EvqFragData && index > 0)
+            {
+                if (mShaderSpec == SH_WEBGL2_SPEC)
+                {
+                    // Error has been already generated if index is not const.
+                    if (indexExpression->getQualifier() == EvqConst)
+                    {
+                        error(location, "", "[",
+                              "array index for gl_FragData must be constant zero");
+                    }
+                    safeIndex = 0;
+                }
+                else if (!isExtensionEnabled("GL_EXT_draw_buffers"))
+                {
+                    outOfRangeError(outOfRangeIndexIsError, location, "", "[",
+                                    "array index for gl_FragData must be zero when "
+                                    "GL_EXT_draw_buffers is disabled");
+                    safeIndex = 0;
+                }
+            }
+            // Only do generic out-of-range check if similar error hasn't already been reported.
+            if (safeIndex < 0)
+            {
+                safeIndex = checkIndexOutOfRange(outOfRangeIndexIsError, location, index,
+                                                 baseExpression->getArraySize(),
+                                                 "array index out of range", "[]");
+            }
+        }
+        else if (baseExpression->isMatrix())
+        {
+            safeIndex = checkIndexOutOfRange(outOfRangeIndexIsError, location, index,
+                                             baseExpression->getType().getCols(),
+                                             "matrix field selection out of range", "[]");
+        }
+        else if (baseExpression->isVector())
+        {
+            safeIndex = checkIndexOutOfRange(outOfRangeIndexIsError, location, index,
+                                             baseExpression->getType().getNominalSize(),
+                                             "vector field selection out of range", "[]");
+        }
+
+        ASSERT(safeIndex >= 0);
+        // Data of constant unions can't be changed, because it may be shared with other
+        // constant unions or even builtins, like gl_MaxDrawBuffers. Instead use a new
+        // sanitized object.
+        if (safeIndex != index)
+        {
+            TConstantUnion *safeConstantUnion = new TConstantUnion();
+            safeConstantUnion->setIConst(safeIndex);
+            indexConstantUnion->replaceConstantUnion(safeConstantUnion);
+        }
+
+        return intermediate.addIndex(EOpIndexDirect, baseExpression, indexExpression, location,
+                                     &mDiagnostics);
+    }
+    else
+    {
+        return intermediate.addIndex(EOpIndexIndirect, baseExpression, indexExpression, location,
+                                     &mDiagnostics);
+    }
+}
+
+int TParseContext::checkIndexOutOfRange(bool outOfRangeIndexIsError,
+                                        const TSourceLoc &location,
+                                        int index,
+                                        int arraySize,
+                                        const char *reason,
+                                        const char *token)
+{
+    if (index >= arraySize || index < 0)
+    {
+        std::stringstream extraInfoStream;
+        extraInfoStream << "'" << index << "'";
+        std::string extraInfo = extraInfoStream.str();
+        outOfRangeError(outOfRangeIndexIsError, location, reason, token, extraInfo.c_str());
+        if (index < 0)
+        {
+            return 0;
+        }
+        else
+        {
+            return arraySize - 1;
+        }
+    }
+    return index;
+}
+
+TIntermTyped *TParseContext::addFieldSelectionExpression(TIntermTyped *baseExpression,
+                                                         const TSourceLoc &dotLocation,
+                                                         const TString &fieldString,
+                                                         const TSourceLoc &fieldLocation)
+{
+    if (baseExpression->isArray())
+    {
+        error(fieldLocation, "cannot apply dot operator to an array", ".");
+        return baseExpression;
+    }
+
+    if (baseExpression->isVector())
+    {
+        TVectorFields fields;
+        if (!parseVectorFields(fieldString, baseExpression->getNominalSize(), fields,
+                               fieldLocation))
+        {
+            fields.num        = 1;
+            fields.offsets[0] = 0;
+        }
+
+        return TIntermediate::AddSwizzle(baseExpression, fields, dotLocation);
+    }
+    else if (baseExpression->getBasicType() == EbtStruct)
+    {
+        const TFieldList &fields = baseExpression->getType().getStruct()->fields();
+        if (fields.empty())
+        {
+            error(dotLocation, "structure has no fields", "Internal Error");
+            return baseExpression;
+        }
+        else
+        {
+            bool fieldFound = false;
+            unsigned int i;
+            for (i = 0; i < fields.size(); ++i)
+            {
+                if (fields[i]->name() == fieldString)
+                {
+                    fieldFound = true;
+                    break;
+                }
+            }
+            if (fieldFound)
+            {
+                TIntermTyped *index = TIntermTyped::CreateIndexNode(i);
+                index->setLine(fieldLocation);
+                return intermediate.addIndex(EOpIndexDirectStruct, baseExpression, index,
+                                             dotLocation, &mDiagnostics);
+            }
+            else
+            {
+                error(dotLocation, " no such field in structure", fieldString.c_str());
+                return baseExpression;
+            }
+        }
+    }
+    else if (baseExpression->isInterfaceBlock())
+    {
+        const TFieldList &fields = baseExpression->getType().getInterfaceBlock()->fields();
+        if (fields.empty())
+        {
+            error(dotLocation, "interface block has no fields", "Internal Error");
+            return baseExpression;
+        }
+        else
+        {
+            bool fieldFound = false;
+            unsigned int i;
+            for (i = 0; i < fields.size(); ++i)
+            {
+                if (fields[i]->name() == fieldString)
+                {
+                    fieldFound = true;
+                    break;
+                }
+            }
+            if (fieldFound)
+            {
+                TIntermTyped *index = TIntermTyped::CreateIndexNode(i);
+                index->setLine(fieldLocation);
+                return intermediate.addIndex(EOpIndexDirectInterfaceBlock, baseExpression, index,
+                                             dotLocation, &mDiagnostics);
+            }
+            else
+            {
+                error(dotLocation, " no such field in interface block", fieldString.c_str());
+                return baseExpression;
+            }
+        }
+    }
+    else
+    {
+        if (mShaderVersion < 300)
+        {
+            error(dotLocation, " field selection requires structure or vector on left hand side",
+                  fieldString.c_str());
+        }
+        else
+        {
+            error(dotLocation,
+                  " field selection requires structure, vector, or interface block on left hand "
+                  "side",
+                  fieldString.c_str());
+        }
+        return baseExpression;
+    }
+}
+
+TLayoutQualifier TParseContext::parseLayoutQualifier(const TString &qualifierType,
+                                                     const TSourceLoc &qualifierTypeLine)
+{
+    TLayoutQualifier qualifier = TLayoutQualifier::create();
+
+    if (qualifierType == "shared")
+    {
+        if (sh::IsWebGLBasedSpec(mShaderSpec))
+        {
+            error(qualifierTypeLine, "Only std140 layout is allowed in WebGL", "shared");
+        }
+        qualifier.blockStorage = EbsShared;
+    }
+    else if (qualifierType == "packed")
+    {
+        if (sh::IsWebGLBasedSpec(mShaderSpec))
+        {
+            error(qualifierTypeLine, "Only std140 layout is allowed in WebGL", "packed");
+        }
+        qualifier.blockStorage = EbsPacked;
+    }
+    else if (qualifierType == "std140")
+    {
+        qualifier.blockStorage = EbsStd140;
+    }
+    else if (qualifierType == "row_major")
+    {
+        qualifier.matrixPacking = EmpRowMajor;
+    }
+    else if (qualifierType == "column_major")
+    {
+        qualifier.matrixPacking = EmpColumnMajor;
+    }
+    else if (qualifierType == "location")
+    {
+        error(qualifierTypeLine, "invalid layout qualifier", qualifierType.c_str(),
+              "location requires an argument");
+    }
+    else if (qualifierType == "rgba32f")
+    {
+        checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+        qualifier.imageInternalFormat = EiifRGBA32F;
+    }
+    else if (qualifierType == "rgba16f")
+    {
+        checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+        qualifier.imageInternalFormat = EiifRGBA16F;
+    }
+    else if (qualifierType == "r32f")
+    {
+        checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+        qualifier.imageInternalFormat = EiifR32F;
+    }
+    else if (qualifierType == "rgba8")
+    {
+        checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+        qualifier.imageInternalFormat = EiifRGBA8;
+    }
+    else if (qualifierType == "rgba8_snorm")
+    {
+        checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+        qualifier.imageInternalFormat = EiifRGBA8_SNORM;
+    }
+    else if (qualifierType == "rgba32i")
+    {
+        checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+        qualifier.imageInternalFormat = EiifRGBA32I;
+    }
+    else if (qualifierType == "rgba16i")
+    {
+        checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+        qualifier.imageInternalFormat = EiifRGBA16I;
+    }
+    else if (qualifierType == "rgba8i")
+    {
+        checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+        qualifier.imageInternalFormat = EiifRGBA8I;
+    }
+    else if (qualifierType == "r32i")
+    {
+        checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+        qualifier.imageInternalFormat = EiifR32I;
+    }
+    else if (qualifierType == "rgba32ui")
+    {
+        checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+        qualifier.imageInternalFormat = EiifRGBA32UI;
+    }
+    else if (qualifierType == "rgba16ui")
+    {
+        checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+        qualifier.imageInternalFormat = EiifRGBA16UI;
+    }
+    else if (qualifierType == "rgba8ui")
+    {
+        checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+        qualifier.imageInternalFormat = EiifRGBA8UI;
+    }
+    else if (qualifierType == "r32ui")
+    {
+        checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+        qualifier.imageInternalFormat = EiifR32UI;
+    }
+
+    else
+    {
+        error(qualifierTypeLine, "invalid layout qualifier", qualifierType.c_str());
+    }
+
+    return qualifier;
+}
+
+void TParseContext::parseLocalSize(const TString &qualifierType,
+                                   const TSourceLoc &qualifierTypeLine,
+                                   int intValue,
+                                   const TSourceLoc &intValueLine,
+                                   const std::string &intValueString,
+                                   size_t index,
+                                   sh::WorkGroupSize *localSize)
+{
+    checkLayoutQualifierSupported(qualifierTypeLine, qualifierType, 310);
+    if (intValue < 1)
+    {
+        std::string errorMessage = std::string(getWorkGroupSizeString(index)) + " must be positive";
+        error(intValueLine, "out of range:", intValueString.c_str(), errorMessage.c_str());
+    }
+    (*localSize)[index] = intValue;
+}
+
+TLayoutQualifier TParseContext::parseLayoutQualifier(const TString &qualifierType,
+                                                     const TSourceLoc &qualifierTypeLine,
+                                                     int intValue,
+                                                     const TSourceLoc &intValueLine)
+{
+    TLayoutQualifier qualifier = TLayoutQualifier::create();
+
+    std::string intValueString = Str(intValue);
+
+    if (qualifierType == "location")
+    {
+        // must check that location is non-negative
+        if (intValue < 0)
+        {
+            error(intValueLine, "out of range:", intValueString.c_str(),
+                  "location must be non-negative");
+        }
+        else
+        {
+            qualifier.location = intValue;
+            qualifier.locationsSpecified = 1;
+        }
+    }
+    else if (qualifierType == "local_size_x")
+    {
+        parseLocalSize(qualifierType, qualifierTypeLine, intValue, intValueLine, intValueString, 0u,
+                       &qualifier.localSize);
+    }
+    else if (qualifierType == "local_size_y")
+    {
+        parseLocalSize(qualifierType, qualifierTypeLine, intValue, intValueLine, intValueString, 1u,
+                       &qualifier.localSize);
+    }
+    else if (qualifierType == "local_size_z")
+    {
+        parseLocalSize(qualifierType, qualifierTypeLine, intValue, intValueLine, intValueString, 2u,
+                       &qualifier.localSize);
+    }
+    else
+    {
+        error(qualifierTypeLine, "invalid layout qualifier", qualifierType.c_str());
+    }
+
+    return qualifier;
+}
+
+TTypeQualifierBuilder *TParseContext::createTypeQualifierBuilder(const TSourceLoc &loc)
+{
+    return new TTypeQualifierBuilder(
+        new TStorageQualifierWrapper(symbolTable.atGlobalLevel() ? EvqGlobal : EvqTemporary, loc),
+        mShaderVersion);
+}
+
+TLayoutQualifier TParseContext::joinLayoutQualifiers(TLayoutQualifier leftQualifier,
+                                                     TLayoutQualifier rightQualifier,
+                                                     const TSourceLoc &rightQualifierLocation)
+{
+    return sh::JoinLayoutQualifiers(leftQualifier, rightQualifier, rightQualifierLocation,
+                                    &mDiagnostics);
+}
+
+TFieldList *TParseContext::addStructDeclaratorListWithQualifiers(
+    const TTypeQualifierBuilder &typeQualifierBuilder,
+    TPublicType *typeSpecifier,
+    TFieldList *fieldList)
+{
+    TTypeQualifier typeQualifier = typeQualifierBuilder.getVariableTypeQualifier(&mDiagnostics);
+
+    typeSpecifier->qualifier       = typeQualifier.qualifier;
+    typeSpecifier->layoutQualifier = typeQualifier.layoutQualifier;
+    typeSpecifier->memoryQualifier = typeQualifier.memoryQualifier;
+    typeSpecifier->invariant       = typeQualifier.invariant;
+    if (typeQualifier.precision != EbpUndefined)
+    {
+        typeSpecifier->precision = typeQualifier.precision;
+    }
+    return addStructDeclaratorList(*typeSpecifier, fieldList);
+}
+
+TFieldList *TParseContext::addStructDeclaratorList(const TPublicType &typeSpecifier,
+                                                   TFieldList *fieldList)
+{
+    checkPrecisionSpecified(typeSpecifier.getLine(), typeSpecifier.precision,
+                            typeSpecifier.getBasicType());
+
+    checkIsNonVoid(typeSpecifier.getLine(), (*fieldList)[0]->name(), typeSpecifier.getBasicType());
+
+    checkWorkGroupSizeIsNotSpecified(typeSpecifier.getLine(), typeSpecifier.layoutQualifier);
+
+    for (unsigned int i = 0; i < fieldList->size(); ++i)
+    {
+        //
+        // Careful not to replace already known aspects of type, like array-ness
+        //
+        TType *type = (*fieldList)[i]->type();
+        type->setBasicType(typeSpecifier.getBasicType());
+        type->setPrimarySize(typeSpecifier.getPrimarySize());
+        type->setSecondarySize(typeSpecifier.getSecondarySize());
+        type->setPrecision(typeSpecifier.precision);
+        type->setQualifier(typeSpecifier.qualifier);
+        type->setLayoutQualifier(typeSpecifier.layoutQualifier);
+        type->setMemoryQualifier(typeSpecifier.memoryQualifier);
+        type->setInvariant(typeSpecifier.invariant);
+
+        // don't allow arrays of arrays
+        if (type->isArray())
+        {
+            checkIsValidTypeForArray(typeSpecifier.getLine(), typeSpecifier);
+        }
+        if (typeSpecifier.array)
+            type->setArraySize(static_cast<unsigned int>(typeSpecifier.arraySize));
+        if (typeSpecifier.getUserDef())
+        {
+            type->setStruct(typeSpecifier.getUserDef()->getStruct());
+        }
+
+        checkIsBelowStructNestingLimit(typeSpecifier.getLine(), *(*fieldList)[i]);
+    }
+
+    return fieldList;
+}
+
+TTypeSpecifierNonArray TParseContext::addStructure(const TSourceLoc &structLine,
+                                                   const TSourceLoc &nameLine,
+                                                   const TString *structName,
+                                                   TFieldList *fieldList)
+{
+    TStructure *structure = new TStructure(structName, fieldList);
+    TType *structureType  = new TType(structure);
+
+    // Store a bool in the struct if we're at global scope, to allow us to
+    // skip the local struct scoping workaround in HLSL.
+    structure->setAtGlobalScope(symbolTable.atGlobalLevel());
+
+    if (!structName->empty())
+    {
+        checkIsNotReserved(nameLine, *structName);
+        TVariable *userTypeDef = new TVariable(structName, *structureType, true);
+        if (!symbolTable.declare(userTypeDef))
+        {
+            error(nameLine, "redefinition", structName->c_str(), "struct");
+        }
+    }
+
+    // ensure we do not specify any storage qualifiers on the struct members
+    for (unsigned int typeListIndex = 0; typeListIndex < fieldList->size(); typeListIndex++)
+    {
+        const TField &field        = *(*fieldList)[typeListIndex];
+        const TQualifier qualifier = field.type()->getQualifier();
+        switch (qualifier)
+        {
+            case EvqGlobal:
+            case EvqTemporary:
+                break;
+            default:
+                error(field.line(), "invalid qualifier on struct member",
+                      getQualifierString(qualifier));
+                break;
+        }
+        if (field.type()->isInvariant())
+        {
+            error(field.line(), "invalid qualifier on struct member", "invariant");
+        }
+        if (IsImage(field.type()->getBasicType()))
+        {
+            error(field.line(), "disallowed type in struct", field.type()->getBasicString());
+        }
+
+        checkIsMemoryQualifierNotSpecified(field.type()->getMemoryQualifier(), field.line());
+
+        checkLocationIsNotSpecified(field.line(), field.type()->getLayoutQualifier());
+    }
+
+    TTypeSpecifierNonArray typeSpecifierNonArray;
+    typeSpecifierNonArray.initialize(EbtStruct, structLine);
+    typeSpecifierNonArray.userDef           = structureType;
+    typeSpecifierNonArray.isStructSpecifier = true;
+    exitStructDeclaration();
+
+    return typeSpecifierNonArray;
+}
+
+TIntermSwitch *TParseContext::addSwitch(TIntermTyped *init,
+                                        TIntermBlock *statementList,
+                                        const TSourceLoc &loc)
+{
+    TBasicType switchType = init->getBasicType();
+    if ((switchType != EbtInt && switchType != EbtUInt) || init->isMatrix() || init->isArray() ||
+        init->isVector())
+    {
+        error(init->getLine(), "init-expression in a switch statement must be a scalar integer",
+              "switch");
+        return nullptr;
+    }
+
+    if (statementList)
+    {
+        if (!ValidateSwitch::validate(switchType, this, statementList, loc))
+        {
+            return nullptr;
+        }
+    }
+
+    TIntermSwitch *node = intermediate.addSwitch(init, statementList, loc);
+    if (node == nullptr)
+    {
+        error(loc, "erroneous switch statement", "switch");
+        return nullptr;
+    }
+    return node;
+}
+
+TIntermCase *TParseContext::addCase(TIntermTyped *condition, const TSourceLoc &loc)
+{
+    if (mSwitchNestingLevel == 0)
+    {
+        error(loc, "case labels need to be inside switch statements", "case");
+        return nullptr;
+    }
+    if (condition == nullptr)
+    {
+        error(loc, "case label must have a condition", "case");
+        return nullptr;
+    }
+    if ((condition->getBasicType() != EbtInt && condition->getBasicType() != EbtUInt) ||
+        condition->isMatrix() || condition->isArray() || condition->isVector())
+    {
+        error(condition->getLine(), "case label must be a scalar integer", "case");
+    }
+    TIntermConstantUnion *conditionConst = condition->getAsConstantUnion();
+    // TODO(oetuaho@nvidia.com): Get rid of the conditionConst == nullptr check once all constant
+    // expressions can be folded. Right now we don't allow constant expressions that ANGLE can't
+    // fold in case labels.
+    if (condition->getQualifier() != EvqConst || conditionConst == nullptr)
+    {
+        error(condition->getLine(), "case label must be constant", "case");
+    }
+    TIntermCase *node = intermediate.addCase(condition, loc);
+    if (node == nullptr)
+    {
+        error(loc, "erroneous case statement", "case");
+        return nullptr;
+    }
+    return node;
+}
+
+TIntermCase *TParseContext::addDefault(const TSourceLoc &loc)
+{
+    if (mSwitchNestingLevel == 0)
+    {
+        error(loc, "default labels need to be inside switch statements", "default");
+        return nullptr;
+    }
+    TIntermCase *node = intermediate.addCase(nullptr, loc);
+    if (node == nullptr)
+    {
+        error(loc, "erroneous default statement", "default");
+        return nullptr;
+    }
+    return node;
+}
+
+TIntermTyped *TParseContext::createUnaryMath(TOperator op,
+                                             TIntermTyped *child,
+                                             const TSourceLoc &loc,
+                                             const TType *funcReturnType)
+{
+    if (child == nullptr)
+    {
+        return nullptr;
+    }
+
+    switch (op)
+    {
+        case EOpLogicalNot:
+            if (child->getBasicType() != EbtBool || child->isMatrix() || child->isArray() ||
+                child->isVector())
+            {
+                return nullptr;
+            }
+            break;
+        case EOpBitwiseNot:
+            if ((child->getBasicType() != EbtInt && child->getBasicType() != EbtUInt) ||
+                child->isMatrix() || child->isArray())
+            {
+                return nullptr;
+            }
+            break;
+        case EOpPostIncrement:
+        case EOpPreIncrement:
+        case EOpPostDecrement:
+        case EOpPreDecrement:
+        case EOpNegative:
+        case EOpPositive:
+            if (child->getBasicType() == EbtStruct || child->getBasicType() == EbtBool ||
+                child->isArray() || IsOpaqueType(child->getBasicType()))
+            {
+                return nullptr;
+            }
+        // Operators for built-ins are already type checked against their prototype.
+        default:
+            break;
+    }
+
+    TIntermUnary *node = new TIntermUnary(op, child);
+    node->setLine(loc);
+
+    TIntermTyped *foldedNode = node->fold(&mDiagnostics);
+    if (foldedNode)
+        return foldedNode;
+
+    return node;
+}
+
+TIntermTyped *TParseContext::addUnaryMath(TOperator op, TIntermTyped *child, const TSourceLoc &loc)
+{
+    TIntermTyped *node = createUnaryMath(op, child, loc, nullptr);
+    if (node == nullptr)
+    {
+        unaryOpError(loc, GetOperatorString(op), child->getCompleteString());
+        return child;
+    }
+    return node;
+}
+
+TIntermTyped *TParseContext::addUnaryMathLValue(TOperator op,
+                                                TIntermTyped *child,
+                                                const TSourceLoc &loc)
+{
+    checkCanBeLValue(loc, GetOperatorString(op), child);
+    return addUnaryMath(op, child, loc);
+}
+
+bool TParseContext::binaryOpCommonCheck(TOperator op,
+                                        TIntermTyped *left,
+                                        TIntermTyped *right,
+                                        const TSourceLoc &loc)
+{
+    if (left->getType().getStruct() || right->getType().getStruct())
+    {
+        switch (op)
+        {
+            case EOpIndexDirectStruct:
+                ASSERT(left->getType().getStruct());
+                break;
+            case EOpEqual:
+            case EOpNotEqual:
+            case EOpAssign:
+            case EOpInitialize:
+                if (left->getType() != right->getType())
+                {
+                    return false;
+                }
+                break;
+            default:
+                error(loc, "Invalid operation for structs", GetOperatorString(op));
+                return false;
+        }
+    }
+
+    if (left->isArray() || right->isArray())
+    {
+        if (mShaderVersion < 300)
+        {
+            error(loc, "Invalid operation for arrays", GetOperatorString(op));
+            return false;
+        }
+
+        if (left->isArray() != right->isArray())
+        {
+            error(loc, "array / non-array mismatch", GetOperatorString(op));
+            return false;
+        }
+
+        switch (op)
+        {
+            case EOpEqual:
+            case EOpNotEqual:
+            case EOpAssign:
+            case EOpInitialize:
+                break;
+            default:
+                error(loc, "Invalid operation for arrays", GetOperatorString(op));
+                return false;
+        }
+        // At this point, size of implicitly sized arrays should be resolved.
+        if (left->getArraySize() != right->getArraySize())
+        {
+            error(loc, "array size mismatch", GetOperatorString(op));
+            return false;
+        }
+    }
+
+    // Check ops which require integer / ivec parameters
+    bool isBitShift = false;
+    switch (op)
+    {
+        case EOpBitShiftLeft:
+        case EOpBitShiftRight:
+        case EOpBitShiftLeftAssign:
+        case EOpBitShiftRightAssign:
+            // Unsigned can be bit-shifted by signed and vice versa, but we need to
+            // check that the basic type is an integer type.
+            isBitShift = true;
+            if (!IsInteger(left->getBasicType()) || !IsInteger(right->getBasicType()))
+            {
+                return false;
+            }
+            break;
+        case EOpBitwiseAnd:
+        case EOpBitwiseXor:
+        case EOpBitwiseOr:
+        case EOpBitwiseAndAssign:
+        case EOpBitwiseXorAssign:
+        case EOpBitwiseOrAssign:
+            // It is enough to check the type of only one operand, since later it
+            // is checked that the operand types match.
+            if (!IsInteger(left->getBasicType()))
+            {
+                return false;
+            }
+            break;
+        default:
+            break;
+    }
+
+    // GLSL ES 1.00 and 3.00 do not support implicit type casting.
+    // So the basic type should usually match.
+    if (!isBitShift && left->getBasicType() != right->getBasicType())
+    {
+        return false;
+    }
+
+    // Check that:
+    // 1. Type sizes match exactly on ops that require that.
+    // 2. Restrictions for structs that contain arrays or samplers are respected.
+    // 3. Arithmetic op type dimensionality restrictions for ops other than multiply are respected.
+    switch (op)
+    {
+        case EOpAssign:
+        case EOpInitialize:
+        case EOpEqual:
+        case EOpNotEqual:
+            // ESSL 1.00 sections 5.7, 5.8, 5.9
+            if (mShaderVersion < 300 && left->getType().isStructureContainingArrays())
+            {
+                error(loc, "undefined operation for structs containing arrays",
+                      GetOperatorString(op));
+                return false;
+            }
+            // Samplers as l-values are disallowed also in ESSL 3.00, see section 4.1.7,
+            // we interpret the spec so that this extends to structs containing samplers,
+            // similarly to ESSL 1.00 spec.
+            if ((mShaderVersion < 300 || op == EOpAssign || op == EOpInitialize) &&
+                left->getType().isStructureContainingSamplers())
+            {
+                error(loc, "undefined operation for structs containing samplers",
+                      GetOperatorString(op));
+                return false;
+            }
+
+            if ((op == EOpAssign || op == EOpInitialize) &&
+                left->getType().isStructureContainingImages())
+            {
+                error(loc, "undefined operation for structs containing images",
+                      GetOperatorString(op));
+                return false;
+            }
+        case EOpLessThan:
+        case EOpGreaterThan:
+        case EOpLessThanEqual:
+        case EOpGreaterThanEqual:
+            if ((left->getNominalSize() != right->getNominalSize()) ||
+                (left->getSecondarySize() != right->getSecondarySize()))
+            {
+                return false;
+            }
+            break;
+        case EOpAdd:
+        case EOpSub:
+        case EOpDiv:
+        case EOpIMod:
+        case EOpBitShiftLeft:
+        case EOpBitShiftRight:
+        case EOpBitwiseAnd:
+        case EOpBitwiseXor:
+        case EOpBitwiseOr:
+        case EOpAddAssign:
+        case EOpSubAssign:
+        case EOpDivAssign:
+        case EOpIModAssign:
+        case EOpBitShiftLeftAssign:
+        case EOpBitShiftRightAssign:
+        case EOpBitwiseAndAssign:
+        case EOpBitwiseXorAssign:
+        case EOpBitwiseOrAssign:
+            if ((left->isMatrix() && right->isVector()) || (left->isVector() && right->isMatrix()))
+            {
+                return false;
+            }
+
+            // Are the sizes compatible?
+            if (left->getNominalSize() != right->getNominalSize() ||
+                left->getSecondarySize() != right->getSecondarySize())
+            {
+                // If the nominal sizes of operands do not match:
+                // One of them must be a scalar.
+                if (!left->isScalar() && !right->isScalar())
+                    return false;
+
+                // In the case of compound assignment other than multiply-assign,
+                // the right side needs to be a scalar. Otherwise a vector/matrix
+                // would be assigned to a scalar. A scalar can't be shifted by a
+                // vector either.
+                if (!right->isScalar() &&
+                    (IsAssignment(op) || op == EOpBitShiftLeft || op == EOpBitShiftRight))
+                    return false;
+            }
+            break;
+        default:
+            break;
+    }
+
+    return true;
+}
+
+bool TParseContext::isMultiplicationTypeCombinationValid(TOperator op,
+                                                         const TType &left,
+                                                         const TType &right)
+{
+    switch (op)
+    {
+        case EOpMul:
+        case EOpMulAssign:
+            return left.getNominalSize() == right.getNominalSize() &&
+                   left.getSecondarySize() == right.getSecondarySize();
+        case EOpVectorTimesScalar:
+            return true;
+        case EOpVectorTimesScalarAssign:
+            ASSERT(!left.isMatrix() && !right.isMatrix());
+            return left.isVector() && !right.isVector();
+        case EOpVectorTimesMatrix:
+            return left.getNominalSize() == right.getRows();
+        case EOpVectorTimesMatrixAssign:
+            ASSERT(!left.isMatrix() && right.isMatrix());
+            return left.isVector() && left.getNominalSize() == right.getRows() &&
+                   left.getNominalSize() == right.getCols();
+        case EOpMatrixTimesVector:
+            return left.getCols() == right.getNominalSize();
+        case EOpMatrixTimesScalar:
+            return true;
+        case EOpMatrixTimesScalarAssign:
+            ASSERT(left.isMatrix() && !right.isMatrix());
+            return !right.isVector();
+        case EOpMatrixTimesMatrix:
+            return left.getCols() == right.getRows();
+        case EOpMatrixTimesMatrixAssign:
+            ASSERT(left.isMatrix() && right.isMatrix());
+            // We need to check two things:
+            // 1. The matrix multiplication step is valid.
+            // 2. The result will have the same number of columns as the lvalue.
+            return left.getCols() == right.getRows() && left.getCols() == right.getCols();
+
+        default:
+            UNREACHABLE();
+            return false;
+    }
+}
+
+TIntermTyped *TParseContext::addBinaryMathInternal(TOperator op,
+                                                   TIntermTyped *left,
+                                                   TIntermTyped *right,
+                                                   const TSourceLoc &loc)
+{
+    if (!binaryOpCommonCheck(op, left, right, loc))
+        return nullptr;
+
+    switch (op)
+    {
+        case EOpEqual:
+        case EOpNotEqual:
+            break;
+        case EOpLessThan:
+        case EOpGreaterThan:
+        case EOpLessThanEqual:
+        case EOpGreaterThanEqual:
+            ASSERT(!left->isArray() && !right->isArray() && !left->getType().getStruct() &&
+                   !right->getType().getStruct());
+            if (left->isMatrix() || left->isVector())
+            {
+                return nullptr;
+            }
+            break;
+        case EOpLogicalOr:
+        case EOpLogicalXor:
+        case EOpLogicalAnd:
+            ASSERT(!left->isArray() && !right->isArray() && !left->getType().getStruct() &&
+                   !right->getType().getStruct());
+            if (left->getBasicType() != EbtBool || !left->isScalar() || !right->isScalar())
+            {
+                return nullptr;
+            }
+            // Basic types matching should have been already checked.
+            ASSERT(right->getBasicType() == EbtBool);
+            break;
+        case EOpAdd:
+        case EOpSub:
+        case EOpDiv:
+        case EOpMul:
+            ASSERT(!left->isArray() && !right->isArray() && !left->getType().getStruct() &&
+                   !right->getType().getStruct());
+            if (left->getBasicType() == EbtBool)
+            {
+                return nullptr;
+            }
+            break;
+        case EOpIMod:
+            ASSERT(!left->isArray() && !right->isArray() && !left->getType().getStruct() &&
+                   !right->getType().getStruct());
+            // Note that this is only for the % operator, not for mod()
+            if (left->getBasicType() == EbtBool || left->getBasicType() == EbtFloat)
+            {
+                return nullptr;
+            }
+            break;
+        default:
+            break;
+    }
+
+    if (op == EOpMul)
+    {
+        op = TIntermBinary::GetMulOpBasedOnOperands(left->getType(), right->getType());
+        if (!isMultiplicationTypeCombinationValid(op, left->getType(), right->getType()))
+        {
+            return nullptr;
+        }
+    }
+
+    TIntermBinary *node = new TIntermBinary(op, left, right);
+    node->setLine(loc);
+
+    // See if we can fold constants.
+    TIntermTyped *foldedNode = node->fold(&mDiagnostics);
+    if (foldedNode)
+        return foldedNode;
+
+    return node;
+}
+
+TIntermTyped *TParseContext::addBinaryMath(TOperator op,
+                                           TIntermTyped *left,
+                                           TIntermTyped *right,
+                                           const TSourceLoc &loc)
+{
+    TIntermTyped *node = addBinaryMathInternal(op, left, right, loc);
+    if (node == 0)
+    {
+        binaryOpError(loc, GetOperatorString(op), left->getCompleteString(),
+                      right->getCompleteString());
+        return left;
+    }
+    return node;
+}
+
+TIntermTyped *TParseContext::addBinaryMathBooleanResult(TOperator op,
+                                                        TIntermTyped *left,
+                                                        TIntermTyped *right,
+                                                        const TSourceLoc &loc)
+{
+    TIntermTyped *node = addBinaryMathInternal(op, left, right, loc);
+    if (node == 0)
+    {
+        binaryOpError(loc, GetOperatorString(op), left->getCompleteString(),
+                      right->getCompleteString());
+        TConstantUnion *unionArray = new TConstantUnion[1];
+        unionArray->setBConst(false);
+        return intermediate.addConstantUnion(unionArray, TType(EbtBool, EbpUndefined, EvqConst),
+                                             loc);
+    }
+    return node;
+}
+
+TIntermBinary *TParseContext::createAssign(TOperator op,
+                                           TIntermTyped *left,
+                                           TIntermTyped *right,
+                                           const TSourceLoc &loc)
+{
+    if (binaryOpCommonCheck(op, left, right, loc))
+    {
+        if (op == EOpMulAssign)
+        {
+            op = TIntermBinary::GetMulAssignOpBasedOnOperands(left->getType(), right->getType());
+            if (!isMultiplicationTypeCombinationValid(op, left->getType(), right->getType()))
+            {
+                return nullptr;
+            }
+        }
+        TIntermBinary *node = new TIntermBinary(op, left, right);
+        node->setLine(loc);
+
+        return node;
+    }
+    return nullptr;
+}
+
+TIntermTyped *TParseContext::addAssign(TOperator op,
+                                       TIntermTyped *left,
+                                       TIntermTyped *right,
+                                       const TSourceLoc &loc)
+{
+    TIntermTyped *node = createAssign(op, left, right, loc);
+    if (node == nullptr)
+    {
+        assignError(loc, "assign", left->getCompleteString(), right->getCompleteString());
+        return left;
+    }
+    return node;
+}
+
+TIntermTyped *TParseContext::addComma(TIntermTyped *left,
+                                      TIntermTyped *right,
+                                      const TSourceLoc &loc)
+{
+    // WebGL2 section 5.26, the following results in an error:
+    // "Sequence operator applied to void, arrays, or structs containing arrays"
+    if (mShaderSpec == SH_WEBGL2_SPEC && (left->isArray() || left->getBasicType() == EbtVoid ||
+                                          left->getType().isStructureContainingArrays() ||
+                                          right->isArray() || right->getBasicType() == EbtVoid ||
+                                          right->getType().isStructureContainingArrays()))
+    {
+        error(loc,
+              "sequence operator is not allowed for void, arrays, or structs containing arrays",
+              ",");
+    }
+
+    return TIntermediate::AddComma(left, right, loc, mShaderVersion);
+}
+
+TIntermBranch *TParseContext::addBranch(TOperator op, const TSourceLoc &loc)
+{
+    switch (op)
+    {
+        case EOpContinue:
+            if (mLoopNestingLevel <= 0)
+            {
+                error(loc, "continue statement only allowed in loops", "");
+            }
+            break;
+        case EOpBreak:
+            if (mLoopNestingLevel <= 0 && mSwitchNestingLevel <= 0)
+            {
+                error(loc, "break statement only allowed in loops and switch statements", "");
+            }
+            break;
+        case EOpReturn:
+            if (mCurrentFunctionType->getBasicType() != EbtVoid)
+            {
+                error(loc, "non-void function must return a value", "return");
+            }
+            break;
+        default:
+            // No checks for discard
+            break;
+    }
+    return intermediate.addBranch(op, loc);
+}
+
+TIntermBranch *TParseContext::addBranch(TOperator op,
+                                        TIntermTyped *returnValue,
+                                        const TSourceLoc &loc)
+{
+    ASSERT(op == EOpReturn);
+    mFunctionReturnsValue = true;
+    if (mCurrentFunctionType->getBasicType() == EbtVoid)
+    {
+        error(loc, "void function cannot return a value", "return");
+    }
+    else if (*mCurrentFunctionType != returnValue->getType())
+    {
+        error(loc, "function return is not matching type:", "return");
+    }
+    return intermediate.addBranch(op, returnValue, loc);
+}
+
+void TParseContext::checkTextureOffsetConst(TIntermAggregate *functionCall)
+{
+    ASSERT(!functionCall->isUserDefined());
+    const TString &name        = functionCall->getFunctionSymbolInfo()->getName();
+    TIntermNode *offset        = nullptr;
+    TIntermSequence *arguments = functionCall->getSequence();
+    if (name.compare(0, 16, "texelFetchOffset") == 0 ||
+        name.compare(0, 16, "textureLodOffset") == 0 ||
+        name.compare(0, 20, "textureProjLodOffset") == 0 ||
+        name.compare(0, 17, "textureGradOffset") == 0 ||
+        name.compare(0, 21, "textureProjGradOffset") == 0)
+    {
+        offset = arguments->back();
+    }
+    else if (name.compare(0, 13, "textureOffset") == 0 ||
+             name.compare(0, 17, "textureProjOffset") == 0)
+    {
+        // A bias parameter might follow the offset parameter.
+        ASSERT(arguments->size() >= 3);
+        offset = (*arguments)[2];
+    }
+    if (offset != nullptr)
+    {
+        TIntermConstantUnion *offsetConstantUnion = offset->getAsConstantUnion();
+        if (offset->getAsTyped()->getQualifier() != EvqConst || !offsetConstantUnion)
+        {
+            TString unmangledName = TFunction::unmangleName(name);
+            error(functionCall->getLine(), "Texture offset must be a constant expression",
+                  unmangledName.c_str());
+        }
+        else
+        {
+            ASSERT(offsetConstantUnion->getBasicType() == EbtInt);
+            size_t size                  = offsetConstantUnion->getType().getObjectSize();
+            const TConstantUnion *values = offsetConstantUnion->getUnionArrayPointer();
+            for (size_t i = 0u; i < size; ++i)
+            {
+                int offsetValue = values[i].getIConst();
+                if (offsetValue > mMaxProgramTexelOffset || offsetValue < mMinProgramTexelOffset)
+                {
+                    std::stringstream tokenStream;
+                    tokenStream << offsetValue;
+                    std::string token = tokenStream.str();
+                    error(offset->getLine(), "Texture offset value out of valid range",
+                          token.c_str());
+                }
+            }
+        }
+    }
+}
+
+// GLSL ES 3.10 Revision 4, 4.9 Memory Access Qualifiers
+void TParseContext::checkImageMemoryAccessForBuiltinFunctions(TIntermAggregate *functionCall)
+{
+    ASSERT(!functionCall->isUserDefined());
+    const TString &name = functionCall->getFunctionSymbolInfo()->getName();
+
+    if (name.compare(0, 5, "image") == 0)
+    {
+        TIntermSequence *arguments = functionCall->getSequence();
+        TIntermNode *imageNode     = (*arguments)[0];
+        TIntermSymbol *imageSymbol = imageNode->getAsSymbolNode();
+
+        const TMemoryQualifier &memoryQualifier = imageSymbol->getMemoryQualifier();
+
+        if (name.compare(5, 5, "Store") == 0)
+        {
+            if (memoryQualifier.readonly)
+            {
+                error(imageNode->getLine(),
+                      "'imageStore' cannot be used with images qualified as 'readonly'",
+                      imageSymbol->getSymbol().c_str());
+            }
+        }
+        else if (name.compare(5, 4, "Load") == 0)
+        {
+            if (memoryQualifier.writeonly)
+            {
+                error(imageNode->getLine(),
+                      "'imageLoad' cannot be used with images qualified as 'writeonly'",
+                      imageSymbol->getSymbol().c_str());
+            }
+        }
+    }
+}
+
+// GLSL ES 3.10 Revision 4, 13.51 Matching of Memory Qualifiers in Function Parameters
+void TParseContext::checkImageMemoryAccessForUserDefinedFunctions(
+    const TFunction *functionDefinition,
+    const TIntermAggregate *functionCall)
+{
+    ASSERT(functionCall->isUserDefined());
+
+    const TIntermSequence &arguments = *functionCall->getSequence();
+
+    ASSERT(functionDefinition->getParamCount() == arguments.size());
+
+    for (size_t i = 0; i < arguments.size(); ++i)
+    {
+        const TType &functionArgumentType  = arguments[i]->getAsTyped()->getType();
+        const TType &functionParameterType = *functionDefinition->getParam(i).type;
+        ASSERT(functionArgumentType.getBasicType() == functionParameterType.getBasicType());
+
+        if (IsImage(functionArgumentType.getBasicType()))
+        {
+            const TMemoryQualifier &functionArgumentMemoryQualifier =
+                functionArgumentType.getMemoryQualifier();
+            const TMemoryQualifier &functionParameterMemoryQualifier =
+                functionParameterType.getMemoryQualifier();
+            if (functionArgumentMemoryQualifier.readonly &&
+                !functionParameterMemoryQualifier.readonly)
+            {
+                error(functionCall->getLine(),
+                      "Function call discards the 'readonly' qualifier from image",
+                      arguments[i]->getAsSymbolNode()->getSymbol().c_str());
+            }
+
+            if (functionArgumentMemoryQualifier.writeonly &&
+                !functionParameterMemoryQualifier.writeonly)
+            {
+                error(functionCall->getLine(),
+                      "Function call discards the 'writeonly' qualifier from image",
+                      arguments[i]->getAsSymbolNode()->getSymbol().c_str());
+            }
+
+            if (functionArgumentMemoryQualifier.coherent &&
+                !functionParameterMemoryQualifier.coherent)
+            {
+                error(functionCall->getLine(),
+                      "Function call discards the 'coherent' qualifier from image",
+                      arguments[i]->getAsSymbolNode()->getSymbol().c_str());
+            }
+
+            if (functionArgumentMemoryQualifier.volatileQualifier &&
+                !functionParameterMemoryQualifier.volatileQualifier)
+            {
+                error(functionCall->getLine(),
+                      "Function call discards the 'volatile' qualifier from image",
+                      arguments[i]->getAsSymbolNode()->getSymbol().c_str());
+            }
+        }
+    }
+}
+
+TIntermTyped *TParseContext::addFunctionCallOrMethod(TFunction *fnCall,
+                                                     TIntermNode *paramNode,
+                                                     TIntermNode *thisNode,
+                                                     const TSourceLoc &loc,
+                                                     bool *fatalError)
+{
+    *fatalError            = false;
+    TOperator op           = fnCall->getBuiltInOp();
+    TIntermTyped *callNode = nullptr;
+
+    if (thisNode != nullptr)
+    {
+        TConstantUnion *unionArray = new TConstantUnion[1];
+        int arraySize              = 0;
+        TIntermTyped *typedThis = thisNode->getAsTyped();
+        if (fnCall->getName() != "length")
+        {
+            error(loc, "invalid method", fnCall->getName().c_str());
+        }
+        else if (paramNode != nullptr)
+        {
+            error(loc, "method takes no parameters", "length");
+        }
+        else if (typedThis == nullptr || !typedThis->isArray())
+        {
+            error(loc, "length can only be called on arrays", "length");
+        }
+        else
+        {
+            arraySize = typedThis->getArraySize();
+            if (typedThis->getAsSymbolNode() == nullptr)
+            {
+                // This code path can be hit with expressions like these:
+                // (a = b).length()
+                // (func()).length()
+                // (int[3](0, 1, 2)).length()
+                // ESSL 3.00 section 5.9 defines expressions so that this is not actually a valid
+                // expression.
+                // It allows "An array name with the length method applied" in contrast to GLSL 4.4
+                // spec section 5.9 which allows "An array, vector or matrix expression with the
+                // length method applied".
+                error(loc, "length can only be called on array names, not on array expressions",
+                      "length");
+            }
+        }
+        unionArray->setIConst(arraySize);
+        callNode =
+            intermediate.addConstantUnion(unionArray, TType(EbtInt, EbpUndefined, EvqConst), loc);
+    }
+    else if (op != EOpNull)
+    {
+        // Then this should be a constructor.
+        callNode = addConstructor(paramNode, op, fnCall, loc);
+    }
+    else
+    {
+        //
+        // Not a constructor.  Find it in the symbol table.
+        //
+        const TFunction *fnCandidate;
+        bool builtIn;
+        fnCandidate = findFunction(loc, fnCall, mShaderVersion, &builtIn);
+        if (fnCandidate)
+        {
+            //
+            // A declared function.
+            //
+            if (builtIn && !fnCandidate->getExtension().empty())
+            {
+                checkCanUseExtension(loc, fnCandidate->getExtension());
+            }
+            op = fnCandidate->getBuiltInOp();
+            if (builtIn && op != EOpNull)
+            {
+                //
+                // A function call mapped to a built-in operation.
+                //
+                if (fnCandidate->getParamCount() == 1)
+                {
+                    //
+                    // Treat it like a built-in unary operator.
+                    //
+                    TIntermAggregate *paramAgg = paramNode->getAsAggregate();
+                    paramNode                  = paramAgg->getSequence()->front();
+                    callNode = createUnaryMath(op, paramNode->getAsTyped(), loc,
+                                               &fnCandidate->getReturnType());
+                    if (callNode == nullptr)
+                    {
+                        std::stringstream extraInfoStream;
+                        extraInfoStream
+                            << "built in unary operator function.  Type: "
+                            << static_cast<TIntermTyped *>(paramNode)->getCompleteString();
+                        std::string extraInfo = extraInfoStream.str();
+                        error(paramNode->getLine(), " wrong operand type", "Internal Error",
+                              extraInfo.c_str());
+                        *fatalError = true;
+                        return nullptr;
+                    }
+                }
+                else
+                {
+                    TIntermAggregate *aggregate =
+                        intermediate.setAggregateOperator(paramNode, op, loc);
+                    aggregate->setType(fnCandidate->getReturnType());
+                    aggregate->setPrecisionFromChildren();
+                    if (aggregate->areChildrenConstQualified())
+                    {
+                        aggregate->getTypePointer()->setQualifier(EvqConst);
+                    }
+
+                    // Some built-in functions have out parameters too.
+                    functionCallLValueErrorCheck(fnCandidate, aggregate);
+
+                    // See if we can constant fold a built-in. Note that this may be possible even
+                    // if it is not const-qualified.
+                    TIntermTyped *foldedNode =
+                        intermediate.foldAggregateBuiltIn(aggregate, &mDiagnostics);
+                    if (foldedNode)
+                    {
+                        callNode = foldedNode;
+                    }
+                    else
+                    {
+                        callNode = aggregate;
+                    }
+                }
+            }
+            else
+            {
+                // This is a real function call
+                TIntermAggregate *aggregate =
+                    intermediate.setAggregateOperator(paramNode, EOpFunctionCall, loc);
+                aggregate->setType(fnCandidate->getReturnType());
+
+                // this is how we know whether the given function is a builtIn function or a user
+                // defined function
+                // if builtIn == false, it's a userDefined -> could be an overloaded
+                // builtIn function also
+                // if builtIn == true, it's definitely a builtIn function with EOpNull
+                if (!builtIn)
+                    aggregate->setUserDefined();
+                aggregate->getFunctionSymbolInfo()->setFromFunction(*fnCandidate);
+
+                // This needs to happen after the function info including name is set
+                if (builtIn)
+                {
+                    aggregate->setBuiltInFunctionPrecision();
+
+                    checkTextureOffsetConst(aggregate);
+
+                    checkImageMemoryAccessForBuiltinFunctions(aggregate);
+                }
+                else
+                {
+                    checkImageMemoryAccessForUserDefinedFunctions(fnCandidate, aggregate);
+                }
+
+                callNode = aggregate;
+
+                functionCallLValueErrorCheck(fnCandidate, aggregate);
+            }
+        }
+        else
+        {
+            // error message was put out by findFunction()
+            // Put on a dummy node for error recovery
+            TConstantUnion *unionArray = new TConstantUnion[1];
+            unionArray->setFConst(0.0f);
+            callNode = intermediate.addConstantUnion(unionArray,
+                                                     TType(EbtFloat, EbpUndefined, EvqConst), loc);
+        }
+    }
+    return callNode;
+}
+
+TIntermTyped *TParseContext::addTernarySelection(TIntermTyped *cond,
+                                                 TIntermTyped *trueExpression,
+                                                 TIntermTyped *falseExpression,
+                                                 const TSourceLoc &loc)
+{
+    checkIsScalarBool(loc, cond);
+
+    if (trueExpression->getType() != falseExpression->getType())
+    {
+        binaryOpError(loc, ":", trueExpression->getCompleteString(),
+                      falseExpression->getCompleteString());
+        return falseExpression;
+    }
+    if (IsOpaqueType(trueExpression->getBasicType()))
+    {
+        // ESSL 1.00 section 4.1.7
+        // ESSL 3.00 section 4.1.7
+        // Opaque/sampler types are not allowed in most types of expressions, including ternary.
+        // Note that structs containing opaque types don't need to be checked as structs are
+        // forbidden below.
+        error(loc, "ternary operator is not allowed for opaque types", ":");
+        return falseExpression;
+    }
+
+    // ESSL1 sections 5.2 and 5.7:
+    // ESSL3 section 5.7:
+    // Ternary operator is not among the operators allowed for structures/arrays.
+    if (trueExpression->isArray() || trueExpression->getBasicType() == EbtStruct)
+    {
+        error(loc, "ternary operator is not allowed for structures or arrays", ":");
+        return falseExpression;
+    }
+    // WebGL2 section 5.26, the following results in an error:
+    // "Ternary operator applied to void, arrays, or structs containing arrays"
+    if (mShaderSpec == SH_WEBGL2_SPEC && trueExpression->getBasicType() == EbtVoid)
+    {
+        error(loc, "ternary operator is not allowed for void", ":");
+        return falseExpression;
+    }
+
+    return TIntermediate::AddTernarySelection(cond, trueExpression, falseExpression, loc);
+}
+
+//
+// Parse an array of strings using yyparse.
+//
+// Returns 0 for success.
+//
+int PaParseStrings(size_t count,
+                   const char *const string[],
+                   const int length[],
+                   TParseContext *context)
+{
+    if ((count == 0) || (string == NULL))
+        return 1;
+
+    if (glslang_initialize(context))
+        return 1;
+
+    int error = glslang_scan(count, string, length, context);
+    if (!error)
+        error = glslang_parse(context);
+
+    glslang_finalize(context);
+
+    return (error == 0) && (context->numErrors() == 0) ? 0 : 1;
+}
+
+}  // namespace sh