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//
// Copyright (c) 2002-2015 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.
//
// CallDAG.h: Defines a call graph DAG of functions to be re-used accross
// analyses, allows to efficiently traverse the functions in topological
// order.
#ifndef COMPILER_TRANSLATOR_CALLDAG_H_
#define COMPILER_TRANSLATOR_CALLDAG_H_
#include <map>
#include "compiler/translator/IntermNode.h"
#include "compiler/translator/VariableInfo.h"
// The translator needs to analyze the the graph of the function calls
// to run checks and analyses; since in GLSL recursion is not allowed
// that graph is a DAG.
// This class is used to precompute that function call DAG so that it
// can be reused by multiple analyses.
//
// It stores a vector of function records, with one record per function.
// Records are accessed by index but a mangled function name can be converted
// to the index of the corresponding record. The records mostly contain the
// AST node of the function and the indices of the function's callees.
//
// In addition, records are in reverse topological order: a function F being
// called by a function G will have index index(F) < index(G), that way
// depth-first analysis becomes analysis in the order of indices.
class CallDAG : angle::NonCopyable
{
public:
CallDAG();
~CallDAG();
struct Record
{
std::string name;
TIntermAggregate *node;
std::vector<int> callees;
};
enum InitResult
{
INITDAG_SUCCESS,
INITDAG_RECURSION,
INITDAG_UNDEFINED,
};
// Returns INITDAG_SUCCESS if it was able to create the DAG, otherwise prints
// the initialization error in info, if present.
InitResult init(TIntermNode *root, TInfoSinkBase *info);
// Returns InvalidIndex if the function wasn't found
size_t findIndex(const TIntermAggregate *function) const;
const Record &getRecordFromIndex(size_t index) const;
const Record &getRecord(const TIntermAggregate *function) const;
size_t size() const;
void clear();
const static size_t InvalidIndex;
private:
std::vector<Record> mRecords;
std::map<int, int> mFunctionIdToIndex;
class CallDAGCreator;
};
#endif // COMPILER_TRANSLATOR_CALLDAG_H_
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