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/*
* Copyright (C) 2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "WHLSLRecursionChecker.h"
#if ENABLE(WEBGPU)
#include "WHLSLCallExpression.h"
#include "WHLSLFunctionDefinition.h"
#include "WHLSLProgram.h"
#include "WHLSLVisitor.h"
#include <wtf/HashSet.h>
namespace WebCore {
namespace WHLSL {
// Makes sure there is no function recursion.
class RecursionChecker final : public Visitor {
private:
void visit(Program& program) override
{
for (auto& functionDefinition : program.functionDefinitions())
checkErrorAndVisit(functionDefinition);
}
void visit(AST::FunctionDefinition& functionDefinition) override
{
if (m_finishedVisiting.contains(&functionDefinition))
return;
auto addResult = m_startedVisiting.add(&functionDefinition);
if (!addResult.isNewEntry) {
setError(Error("Cannot use recursion in the call graph.", functionDefinition.codeLocation()));
return;
}
if (functionDefinition.parsingMode() != ParsingMode::StandardLibrary)
Visitor::visit(functionDefinition);
{
auto addResult = m_finishedVisiting.add(&functionDefinition);
ASSERT_UNUSED(addResult, addResult.isNewEntry);
}
}
void visit(AST::CallExpression& callExpression) override
{
Visitor::visit(callExpression);
if (is<AST::FunctionDefinition>(callExpression.function()))
checkErrorAndVisit(downcast<AST::FunctionDefinition>(callExpression.function()));
}
HashSet<AST::FunctionDefinition*> m_startedVisiting;
HashSet<AST::FunctionDefinition*> m_finishedVisiting;
};
Expected<void, Error> checkRecursion(Program& program)
{
RecursionChecker recursionChecker;
recursionChecker.Visitor::visit(program);
return recursionChecker.result();
}
}
}
#endif