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+//
+// Copyright (c) 2013-2014 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.
+//
+// ShaderVars.h:
+//  Types to represent GL variables (varyings, uniforms, etc)
+//
+
+#ifndef GLSLANG_SHADERVARS_H_
+#define GLSLANG_SHADERVARS_H_
+
+#include <algorithm>
+#include <array>
+#include <string>
+#include <vector>
+
+// This type is defined here to simplify ANGLE's integration with glslang for SPIRv.
+using ShCompileOptions = uint64_t;
+
+namespace sh
+{
+// GLenum alias
+typedef unsigned int GLenum;
+
+// Varying interpolation qualifier, see section 4.3.9 of the ESSL 3.00.4 spec
+enum InterpolationType
+{
+    INTERPOLATION_SMOOTH,
+    INTERPOLATION_CENTROID,
+    INTERPOLATION_FLAT
+};
+
+// Validate link & SSO consistency of interpolation qualifiers
+bool InterpolationTypesMatch(InterpolationType a, InterpolationType b);
+
+// Uniform block layout qualifier, see section 4.3.8.3 of the ESSL 3.00.4 spec
+enum BlockLayoutType
+{
+    BLOCKLAYOUT_STANDARD,
+    BLOCKLAYOUT_STD140 = BLOCKLAYOUT_STANDARD,
+    BLOCKLAYOUT_STD430,  // Shader storage block layout qualifier
+    BLOCKLAYOUT_PACKED,
+    BLOCKLAYOUT_SHARED
+};
+
+// Interface Blocks, see section 4.3.9 of the ESSL 3.10 spec
+enum class BlockType
+{
+    BLOCK_UNIFORM,
+    BLOCK_BUFFER,
+
+    // Required in OpenGL ES 3.1 extension GL_OES_shader_io_blocks.
+    // TODO(jiawei.shao@intel.com): add BLOCK_OUT.
+    BLOCK_IN
+};
+
+// Base class for all variables defined in shaders, including Varyings, Uniforms, etc
+// Note: we must override the copy constructor and assignment operator so we can
+// work around excessive GCC binary bloating:
+// See https://code.google.com/p/angleproject/issues/detail?id=697
+struct ShaderVariable
+{
+    ShaderVariable();
+    ShaderVariable(GLenum typeIn);
+    ShaderVariable(GLenum typeIn, unsigned int arraySizeIn);
+    ~ShaderVariable();
+    ShaderVariable(const ShaderVariable &other);
+    ShaderVariable &operator=(const ShaderVariable &other);
+
+    bool isArrayOfArrays() const { return arraySizes.size() >= 2u; }
+    bool isArray() const { return !arraySizes.empty(); }
+    unsigned int getArraySizeProduct() const;
+    // Return the inner array size product.
+    // For example, if there's a variable declared as size 3 array of size 4 array of size 5 array
+    // of int:
+    //   int a[3][4][5];
+    // then getInnerArraySizeProduct of a would be 4*5.
+    unsigned int getInnerArraySizeProduct() const;
+
+    // Array size 0 means not an array when passed to or returned from these functions.
+    // Note that setArraySize() is deprecated and should not be used inside ANGLE.
+    unsigned int getOutermostArraySize() const { return isArray() ? arraySizes.back() : 0; }
+    void setArraySize(unsigned int size);
+
+    // Turn this ShaderVariable from an array into a specific element in that array. Will update
+    // flattenedOffsetInParentArrays.
+    void indexIntoArray(unsigned int arrayIndex);
+
+    // Get the nth nested array size from the top. Caller is responsible for range checking
+    // arrayNestingIndex.
+    unsigned int getNestedArraySize(unsigned int arrayNestingIndex) const;
+
+    // This function should only be used with variables that are of a basic type or an array of a
+    // basic type. Shader interface variables that are enumerated according to rules in GLES 3.1
+    // spec section 7.3.1.1 page 77 are fine. For those variables the return value should match the
+    // ARRAY_SIZE value that can be queried through the API.
+    unsigned int getBasicTypeElementCount() const;
+
+    bool isStruct() const { return !fields.empty(); }
+
+    // All of the shader's variables are described using nested data
+    // structures. This is needed in order to disambiguate similar looking
+    // types, such as two structs containing the same fields, but in
+    // different orders. "findInfoByMappedName" provides an easy query for
+    // users to dive into the data structure and fetch the unique variable
+    // instance corresponding to a dereferencing chain of the top-level
+    // variable.
+    // Given a mapped name like 'a[0].b.c[0]', return the ShaderVariable
+    // that defines 'c' in |leafVar|, and the original name 'A[0].B.C[0]'
+    // in |originalName|, based on the assumption that |this| defines 'a'.
+    // If no match is found, return false.
+    bool findInfoByMappedName(const std::string &mappedFullName,
+                              const ShaderVariable **leafVar,
+                              std::string *originalFullName) const;
+
+    bool isBuiltIn() const;
+    bool isEmulatedBuiltIn() const;
+
+    GLenum type;
+    GLenum precision;
+    std::string name;
+    std::string mappedName;
+
+    // Used to make an array type. Outermost array size is stored at the end of the vector.
+    std::vector<unsigned int> arraySizes;
+
+    // Offset of this variable in parent arrays. In case the parent is an array of arrays, the
+    // offset is outerArrayElement * innerArraySize + innerArrayElement.
+    // For example, if there's a variable declared as size 3 array of size 4 array of int:
+    //   int a[3][4];
+    // then the flattenedOffsetInParentArrays of a[2] would be 2.
+    // and flattenedOffsetInParentArrays of a[2][1] would be 2*4 + 1 = 9.
+    int parentArrayIndex() const
+    {
+        return hasParentArrayIndex() ? flattenedOffsetInParentArrays : 0;
+    }
+
+    void setParentArrayIndex(int index) { flattenedOffsetInParentArrays = index; }
+
+    bool hasParentArrayIndex() const { return flattenedOffsetInParentArrays != -1; }
+
+    // Static use means that the variable is accessed somewhere in the shader source.
+    bool staticUse;
+    // A variable is active unless the compiler determined that it is not accessed by the shader.
+    // All active variables are statically used, but not all statically used variables are
+    // necessarily active. GLES 3.0.5 section 2.12.6. GLES 3.1 section 7.3.1.
+    bool active;
+    std::vector<ShaderVariable> fields;
+    std::string structName;
+
+    // Only applies to interface block fields. Kept here for simplicity.
+    bool isRowMajorLayout;
+
+  protected:
+    bool isSameVariableAtLinkTime(const ShaderVariable &other,
+                                  bool matchPrecision,
+                                  bool matchName) const;
+
+    bool operator==(const ShaderVariable &other) const;
+    bool operator!=(const ShaderVariable &other) const { return !operator==(other); }
+
+    int flattenedOffsetInParentArrays;
+};
+
+// A variable with an integer location to pass back to the GL API: either uniform (can have location
+// in GLES3.1+), vertex shader input or fragment shader output.
+struct VariableWithLocation : public ShaderVariable
+{
+    VariableWithLocation();
+    ~VariableWithLocation();
+    VariableWithLocation(const VariableWithLocation &other);
+    VariableWithLocation &operator=(const VariableWithLocation &other);
+    bool operator==(const VariableWithLocation &other) const;
+    bool operator!=(const VariableWithLocation &other) const { return !operator==(other); }
+
+    int location;
+};
+
+struct Uniform : public VariableWithLocation
+{
+    Uniform();
+    ~Uniform();
+    Uniform(const Uniform &other);
+    Uniform &operator=(const Uniform &other);
+    bool operator==(const Uniform &other) const;
+    bool operator!=(const Uniform &other) const { return !operator==(other); }
+
+    int binding;
+    GLenum imageUnitFormat;
+    int offset;
+    bool readonly;
+    bool writeonly;
+
+    // Decide whether two uniforms are the same at shader link time,
+    // assuming one from vertex shader and the other from fragment shader.
+    // GLSL ES Spec 3.00.3, section 4.3.5.
+    // GLSL ES Spec 3.10.4, section 4.4.5
+    bool isSameUniformAtLinkTime(const Uniform &other) const;
+};
+
+struct Attribute : public VariableWithLocation
+{
+    Attribute();
+    ~Attribute();
+    Attribute(const Attribute &other);
+    Attribute &operator=(const Attribute &other);
+    bool operator==(const Attribute &other) const;
+    bool operator!=(const Attribute &other) const { return !operator==(other); }
+};
+
+struct OutputVariable : public VariableWithLocation
+{
+    OutputVariable();
+    ~OutputVariable();
+    OutputVariable(const OutputVariable &other);
+    OutputVariable &operator=(const OutputVariable &other);
+    bool operator==(const OutputVariable &other) const;
+    bool operator!=(const OutputVariable &other) const { return !operator==(other); }
+
+    // From EXT_blend_func_extended.
+    int index;
+};
+
+struct InterfaceBlockField : public ShaderVariable
+{
+    InterfaceBlockField();
+    ~InterfaceBlockField();
+    InterfaceBlockField(const InterfaceBlockField &other);
+    InterfaceBlockField &operator=(const InterfaceBlockField &other);
+    bool operator==(const InterfaceBlockField &other) const;
+    bool operator!=(const InterfaceBlockField &other) const { return !operator==(other); }
+
+    // Decide whether two InterfaceBlock fields are the same at shader
+    // link time, assuming one from vertex shader and the other from
+    // fragment shader.
+    // See GLSL ES Spec 3.00.3, sec 4.3.7.
+    bool isSameInterfaceBlockFieldAtLinkTime(const InterfaceBlockField &other) const;
+};
+
+struct Varying : public VariableWithLocation
+{
+    Varying();
+    ~Varying();
+    Varying(const Varying &other);
+    Varying &operator=(const Varying &other);
+    bool operator==(const Varying &other) const;
+    bool operator!=(const Varying &other) const { return !operator==(other); }
+
+    // Decide whether two varyings are the same at shader link time,
+    // assuming one from vertex shader and the other from fragment shader.
+    // Invariance needs to match only in ESSL1. Relevant spec sections:
+    // GLSL ES 3.00.4, sections 4.6.1 and 4.3.9.
+    // GLSL ES 1.00.17, section 4.6.4.
+    bool isSameVaryingAtLinkTime(const Varying &other, int shaderVersion) const;
+
+    // Deprecated version of isSameVaryingAtLinkTime, which assumes ESSL1.
+    bool isSameVaryingAtLinkTime(const Varying &other) const;
+
+    InterpolationType interpolation;
+    bool isInvariant;
+};
+
+struct InterfaceBlock
+{
+    InterfaceBlock();
+    ~InterfaceBlock();
+    InterfaceBlock(const InterfaceBlock &other);
+    InterfaceBlock &operator=(const InterfaceBlock &other);
+
+    // Fields from blocks with non-empty instance names are prefixed with the block name.
+    std::string fieldPrefix() const;
+    std::string fieldMappedPrefix() const;
+
+    // Decide whether two interface blocks are the same at shader link time.
+    bool isSameInterfaceBlockAtLinkTime(const InterfaceBlock &other) const;
+
+    bool isBuiltIn() const;
+
+    bool isArray() const { return arraySize > 0; }
+    unsigned int elementCount() const { return std::max(1u, arraySize); }
+
+    std::string name;
+    std::string mappedName;
+    std::string instanceName;
+    unsigned int arraySize;
+    BlockLayoutType layout;
+
+    // Deprecated. Matrix packing should only be queried from individual fields of the block.
+    // TODO(oetuaho): Remove this once it is no longer used in Chromium.
+    bool isRowMajorLayout;
+
+    int binding;
+    bool staticUse;
+    bool active;
+    BlockType blockType;
+    std::vector<InterfaceBlockField> fields;
+};
+
+struct WorkGroupSize
+{
+    // Must have a trivial default constructor since it is used in YYSTYPE.
+    inline WorkGroupSize() = default;
+    inline explicit constexpr WorkGroupSize(int initialSize);
+
+    void fill(int fillValue);
+    void setLocalSize(int localSizeX, int localSizeY, int localSizeZ);
+
+    int &operator[](size_t index);
+    int operator[](size_t index) const;
+    size_t size() const;
+
+    // Checks whether two work group size declarations match.
+    // Two work group size declarations are the same if the explicitly specified elements are the
+    // same or if one of them is specified as one and the other one is not specified
+    bool isWorkGroupSizeMatching(const WorkGroupSize &right) const;
+
+    // Checks whether any of the values are set.
+    bool isAnyValueSet() const;
+
+    // Checks whether all of the values are set.
+    bool isDeclared() const;
+
+    // Checks whether either all of the values are set, or none of them are.
+    bool isLocalSizeValid() const;
+
+    int localSizeQualifiers[3];
+};
+
+inline constexpr WorkGroupSize::WorkGroupSize(int initialSize)
+    : localSizeQualifiers{initialSize, initialSize, initialSize}
+{}
+
+}  // namespace sh
+
+#endif  // GLSLANG_SHADERVARS_H_