ValidateAST.h - mozsearch

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//

// Copyright 2019 The ANGLE Project Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

//

#ifndef COMPILER_TRANSLATOR_VALIDATEAST_H_

#define COMPILER_TRANSLATOR_VALIDATEAST_H_

#include "compiler/translator/BaseTypes.h"

#include "compiler/translator/Common.h"

namespace sh

class TDiagnostics;

class TIntermNode;

// The following options (stored in Compiler) tell the validator what to validate.  Some validations

// are conditional to certain passes.

struct ValidateASTOptions

    // TODO: add support for the flags marked with TODO. http://anglebug.com/2733

    // Check that every node always has only one parent,

    bool validateSingleParent = true;

    // Check that all symbols reference TVariables that have been declared.  For built-ins, this

    // makes sure that the same GLSL built-in uses the same TVariable consistently.

    bool validateVariableReferences = true;

    // Whether validateVariableReferences should also include specialization constants.  Their

    // declaration is output after their usage is discovered, so this is disabled until then.

    bool validateSpecConstReferences = false;

    // Check that TIntermUnary and TIntermAggregate nodes with a built-in op reference a function

    // with said op.

    bool validateBuiltInOps = true;

    // Check that all EOpCallFunctionInAST have their corresponding function definitions in the AST,

    // with matching symbol ids. There should also be at least a prototype declaration before the

    // function is called.

    bool validateFunctionCall = true;

    // Check that EOpCallInternalRawFunction is not used.  This OP is deprecated and needs to be

    // removed.  http://anglebug.com/6059

    bool validateNoRawFunctionCalls = true;

    // Check that there are no null nodes where they are not allowed, for example as children of

    // TIntermDeclaration or TIntermBlock.

    bool validateNullNodes = true;

    // Check that symbols that reference variables have consistent qualifiers and symbol ids with

    // the variable declaration.  The following needs to be validated:

//

    // Implemented:

//

    //  - Function parameters having one of EvqParam* qualifiers.

    //  - No const qualifier on opaque function parameters.

    //  - gl_ClipDistance, gl_CullDistance and gl_LastFragData are correctly qualified even when

    //    redeclared in the shader.

//

    // TODO:

//

    //  - Function-local variables must have the EvqTemporary qualifier.

    //  - Symbol references and declarations have identical qualifiers.

    bool validateQualifiers = true;

    // Check that every symbol has its precision specified.  That includes variables, block members,

    // function parameters and return values.

    bool validatePrecision = true;

    // Check that variable declarations that can't have initializers don't have initializers

    // (varyings, uniforms for example).

    bool validateInitializers = true;  // TODO

    // Check that there is only one TFunction with each function name referenced in the nodes (no

    // two TFunctions with the same name, taking internal/non-internal namespaces into account).

    bool validateUniqueFunctions = true;  // TODO

    // Check that references to structs are matched with the corresponding struct declaration.

    bool validateStructUsage = true;

    // Check that expression nodes have the correct type considering their operand(s).  The

    // following validation is possible:

//

    // Implemented:

//

    //  - Binary node that indexes T[] should have type T

    //  - Binary nodes with EOpIndexDirect* should have a constant as the right node

    //  - Switch nodes should have an integer type in the selector

//

    // TODO:

//

    //  - Function calls (including built-ins) have the same return type in the node and function.

    //  - Unary and binary operators have the correct type based on operands

    //  - Swizzle result has same type as the operand except for vector size

    //  - Ternary operator has the same type as the operands

    //  - Case expressions have the same type as the switch selector

    bool validateExpressionTypes = true;

    // If SeparateDeclarations has been run, check for the absence of multi declarations as well.

    bool validateMultiDeclarations = false;

    // If PruneNoOps has been run, check that no statements are ever added after branches in the

    // same block.  Those statements would be dead code.

    bool validateNoStatementsAfterBranch = false;

    // Check that swizzle is not applied to swizzle.  Swizzles of swizzles are folded in

    // TIntermSwizzle::fold.

    bool validateNoSwizzleOfSwizzle = true;

    // Once set, disallows any further transformations on the tree.  Used before AST post-processing

    // which requires that the tree remains unmodified.

    bool validateNoMoreTransformations = false;

};

// Check for errors and output error messages on the context.

// Returns true if there are no errors.

bool ValidateAST(TIntermNode *root, TDiagnostics *diagnostics, const ValidateASTOptions &options);

}  // namespace sh

#endif  // COMPILER_TRANSLATOR_VALIDATESWITCH_H_