1// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7// http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15#ifndef COMPILER_ANALYZE_CALL_DEPTH_H_
16#define COMPILER_ANALYZE_CALL_DEPTH_H_
17
18#include "intermediate.h"
19
20#include <set>
21#include <limits.h>
22
23// Traverses intermediate tree to analyze call depth or detect function recursion
24class AnalyzeCallDepth : public TIntermTraverser
25{
26public:
27 AnalyzeCallDepth(TIntermNode *root);
28 ~AnalyzeCallDepth();
29
30 virtual bool visitSwitch(Visit, TIntermSwitch*);
31 virtual bool visitAggregate(Visit, TIntermAggregate*);
32
33 unsigned int analyzeCallDepth();
34
35private:
36 class FunctionNode
37 {
38 public:
39 FunctionNode(TIntermAggregate *node);
40
41 const TString &getName() const;
42 void addCallee(FunctionNode *callee);
43 unsigned int analyzeCallDepth(AnalyzeCallDepth *analyzeCallDepth);
44 unsigned int getLastDepth() const;
45
46 void removeIfUnreachable();
47
48 private:
49 TIntermAggregate *const node;
50 TVector<FunctionNode*> callees;
51
52 Visit visit;
53 unsigned int callDepth;
54 };
55
56 FunctionNode *findFunctionByName(const TString &name);
57
58 std::vector<FunctionNode*> functions;
59 typedef std::set<FunctionNode*> FunctionSet;
60 FunctionSet globalFunctionCalls;
61 FunctionNode *currentFunction;
62};
63
64#endif // COMPILER_ANALYZE_CALL_DEPTH_H_
65