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//
// Copyright (c) 2002-2014 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.
//
#ifndef COMPILER_TRANSLATOR_LOOPINFO_H_
#define COMPILER_TRANSLATOR_LOOPINFO_H_
#include "compiler/translator/IntermNode.h"
class TLoopIndexInfo
{
public:
TLoopIndexInfo();
// If type is EbtInt, fill all fields of the structure with info
// extracted from a loop node.
// If type is not EbtInt, only fill id and type.
void fillInfo(TIntermLoop *node);
int getId() const { return mId; }
void setId(int id) { mId = id; }
TBasicType getType() const { return mType; }
void setType(TBasicType type) { mType = type; }
int getCurrentValue() const { return mCurrentValue; }
void step() { mCurrentValue += mIncrementValue; }
// Check if the current value satisfies the loop condition.
bool satisfiesLoopCondition() const;
private:
int mId;
TBasicType mType; // Either EbtInt or EbtFloat
// Below fields are only valid if the index's type is int.
int mInitValue;
int mStopValue;
int mIncrementValue;
TOperator mOp;
int mCurrentValue;
};
struct TLoopInfo
{
TLoopIndexInfo index;
TIntermLoop *loop;
TLoopInfo();
TLoopInfo(TIntermLoop *node);
};
class TLoopStack : public TVector<TLoopInfo>
{
public:
// Search loop stack for a loop whose index matches the input symbol.
TIntermLoop *findLoop(TIntermSymbol *symbol);
// Find the loop index info in the loop stack by the input symbol.
TLoopIndexInfo *getIndexInfo(TIntermSymbol *symbol);
// Update the currentValue for the next loop iteration.
void step();
// Return false if loop condition is no longer satisfied.
bool satisfiesLoopCondition();
// Check if the symbol is the index of a loop that's unrolled.
bool needsToReplaceSymbolWithValue(TIntermSymbol *symbol);
// Return the current value of a given loop index symbol.
int getLoopIndexValue(TIntermSymbol *symbol);
void push(TIntermLoop *info);
void pop();
};
#endif // COMPILER_TRANSLATOR_LOOPINFO_H_
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