ValidateGlobalInitializer.cpp

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Author : Stuart Morgan
Date : 2019-08-14 12:25:12
Hash : 9d737966
Message : Standardize copyright notices to project style For all "ANGLE Project" copyrights, standardize to the format specified by the style guide. Changes: - "Copyright (c)" and "Copyright(c)" changed to just "Copyright". - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1"). - Fixed a small number of files that had no copyright date using the initial commit year from the version control history. - Fixed one instance of copyright being "The ANGLE Project" rather than "The ANGLE Project Authors" These changes are applied both to the copyright of source file, and where applicable to copyright statements that are generated by templates. BUG=angleproject:3811 Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

src/compiler/translator/ValidateGlobalInitializer.cpp

//
// Copyright 2002 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

#include "compiler/translator/ValidateGlobalInitializer.h"

#include "compiler/translator/tree_util/IntermTraverse.h"

namespace sh
{

namespace
{

const int kMaxAllowedTraversalDepth = 256;

class ValidateGlobalInitializerTraverser : public TIntermTraverser
{
  public:
    ValidateGlobalInitializerTraverser(int shaderVersion, bool isWebGL);

    void visitSymbol(TIntermSymbol *node) override;
    void visitConstantUnion(TIntermConstantUnion *node) override;
    bool visitAggregate(Visit visit, TIntermAggregate *node) override;
    bool visitBinary(Visit visit, TIntermBinary *node) override;
    bool visitUnary(Visit visit, TIntermUnary *node) override;

    bool isValid() const { return mIsValid && mMaxDepth < mMaxAllowedDepth; }
    bool issueWarning() const { return mIssueWarning; }

  private:
    int mShaderVersion;
    bool mIsWebGL;
    bool mIsValid;
    bool mIssueWarning;
};

void ValidateGlobalInitializerTraverser::visitSymbol(TIntermSymbol *node)
{
    // ESSL 1.00 section 4.3 (or ESSL 3.00 section 4.3):
    // Global initializers must be constant expressions.
    switch (node->getType().getQualifier())
    {
        case EvqConst:
            break;
        case EvqGlobal:
        case EvqTemporary:
        case EvqUniform:
            // We allow these cases to be compatible with legacy ESSL 1.00 content.
            // Implement stricter rules for ESSL 3.00 since there's no legacy content to deal
            // with.
            if ((mShaderVersion >= 300) || !mIsWebGL)
            {
                mIsValid = false;
            }
            else
            {
                mIssueWarning = true;
            }
            break;
        default:
            mIsValid = false;
    }
}

void ValidateGlobalInitializerTraverser::visitConstantUnion(TIntermConstantUnion *node)
{
    // Constant unions that are not constant expressions may result from folding a ternary
    // expression.
    switch (node->getType().getQualifier())
    {
        case EvqConst:
            break;
        case EvqTemporary:
            if ((mShaderVersion >= 300) || !mIsWebGL)
            {
                mIsValid = false;
            }
            else
            {
                mIssueWarning = true;
            }
            break;
        default:
            UNREACHABLE();
    }
}

bool ValidateGlobalInitializerTraverser::visitAggregate(Visit visit, TIntermAggregate *node)
{
    // Disallow calls to user-defined functions and texture lookup functions in global variable
    // initializers.
    // This is done simply by disabling all function calls - built-in math functions don't use
    // the function call ops.
    if (node->isFunctionCall())
    {
        mIsValid = false;
    }
    return true;
}

bool ValidateGlobalInitializerTraverser::visitBinary(Visit visit, TIntermBinary *node)
{
    if (node->isAssignment())
    {
        mIsValid = false;
    }
    return true;
}

bool ValidateGlobalInitializerTraverser::visitUnary(Visit visit, TIntermUnary *node)
{
    if (node->isAssignment())
    {
        mIsValid = false;
    }
    return true;
}

ValidateGlobalInitializerTraverser::ValidateGlobalInitializerTraverser(int shaderVersion,
                                                                       bool isWebGL)
    : TIntermTraverser(true, false, false, nullptr),
      mShaderVersion(shaderVersion),
      mIsWebGL(isWebGL),
      mIsValid(true),
      mIssueWarning(false)
{
    setMaxAllowedDepth(kMaxAllowedTraversalDepth);
}

}  // namespace

bool ValidateGlobalInitializer(TIntermTyped *initializer,
                               int shaderVersion,
                               bool isWebGL,
                               bool *warning)
{
    ValidateGlobalInitializerTraverser validate(shaderVersion, isWebGL);
    initializer->traverse(&validate);
    ASSERT(warning != nullptr);
    *warning = validate.issueWarning();
    return validate.isValid();
}

}  // namespace sh

kc3-lang/angle/src/compiler/translator/ValidateGlobalInitializer.cpp

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kc3-lang/angle /src/compiler/translator/ValidateGlobalInitializer.cpp