1/*
2 * Copyright (C) 2019 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "WHLSLRecursionChecker.h"
28
29#if ENABLE(WEBGPU)
30
31#include "WHLSLCallExpression.h"
32#include "WHLSLFunctionDefinition.h"
33#include "WHLSLVisitor.h"
34#include <wtf/HashSet.h>
35
36namespace WebCore {
37
38namespace WHLSL {
39
40// Makes sure there is no function recursion.
41class RecursionChecker : public Visitor {
42private:
43 void visit(AST::FunctionDefinition& functionDefinition) override
44 {
45 auto addResult = m_visitingSet.add(&functionDefinition);
46 if (!addResult.isNewEntry) {
47 setError();
48 return;
49 }
50
51 Visitor::visit(functionDefinition);
52
53 auto success = m_visitingSet.remove(&functionDefinition);
54 ASSERT_UNUSED(success, success);
55 }
56
57 void visit(AST::CallExpression& callExpression) override
58 {
59 ASSERT(callExpression.function());
60 Visitor::visit(*callExpression.function());
61 }
62
63 HashSet<AST::FunctionDefinition*> m_visitingSet;
64};
65
66bool checkRecursion(Program& program)
67{
68 RecursionChecker recursionChecker;
69 recursionChecker.Visitor::visit(program);
70 return !recursionChecker.error();
71}
72
73}
74
75}
76
77#endif
78