WHLSLRecursionChecker.cpp [plain text]
#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 {
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