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// Copyright 2006 Google Inc. All Rights Reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// pattern.h : global pattern references and initialization
// This file implements easy access to statically declared
// data patterns.
#ifndef STRESSAPPTEST_PATTERN_H_
#define STRESSAPPTEST_PATTERN_H_
#include <vector>
#include <string>
// This file must work with autoconf on its public version,
// so these includes are correct.
#include "adler32memcpy.h"
#include "sattypes.h"
// 2 = 128 bit bus, 1 = 64 bit bus, 0 = 32 bit bus
const int kBusShift = 2;
// Pattern and CRC data structure
struct PatternData {
const char *name; // Name of this pattern.
unsigned int *pat; // Data array.
unsigned int mask; // Size - 1. data[index & mask] is always valid.
unsigned char weight[4]; // Weighted frequency of this pattern.
// Each pattern has 32,64,128,256 width versions.
// All weights are added up, a random number is
// chosen between 0-sum(weights), and the
// appropriate pattern is chosen. Thus a weight of
// 1 is rare, a weight of 10 is 2x as likely to be
// chosen as a weight of 5.
};
// Data structure to access data patterns.
class Pattern {
public:
Pattern();
~Pattern();
// Fill pattern data and calculate CRC.
int Initialize(const struct PatternData &pattern_init,
int buswidth,
bool invert,
int weight);
// Access data members.
// "busshift_" allows for repeating each pattern word 1, 2, 4, etc. times.
// in order to create patterns of different width.
unsigned int pattern(unsigned int offset) {
unsigned int data = pattern_->pat[(offset >> busshift_) & pattern_->mask];
if (inverse_)
data = ~data;
return data;
}
const AdlerChecksum *crc() {return crc_;}
unsigned int mask() {return pattern_->mask;}
unsigned int weight() {return weight_;}
const char *name() {return name_.c_str();}
private:
int CalculateCrc();
const struct PatternData *pattern_;
int busshift_; // Target data bus width.
bool inverse_; // Invert the data from the original pattern.
AdlerChecksum *crc_; // CRC of this pattern.
string name_; // The human readable pattern name.
int weight_; // This is the likelihood that this
// pattern will be chosen.
// We want to copy this!
// DISALLOW_COPY_AND_ASSIGN(Pattern);
};
// Object used to access global pattern list.
class PatternList {
public:
PatternList();
~PatternList();
// Initialize pointers to global data patterns, and calculate CRC.
int Initialize();
int Destroy();
// Return the pattern designated by index i.
Pattern *GetPattern(int i);
// Return a random pattern according to the specified weighted probability.
Pattern *GetRandomPattern();
// Return the number of patterns available.
int Size() {return size_;}
private:
vector<class Pattern> patterns_;
int weightcount_; // Total count of pattern weights.
unsigned int size_;
int initialized_;
DISALLOW_COPY_AND_ASSIGN(PatternList);
};
// CrcIncrement allows an abstracted way to add a 32bit
// value into a running CRC. This function should be fast, and
// generate meaningful CRCs for the types of data patterns that
// we are using here.
// This CRC formula may not be optimal, but it does work.
// It may be improved in the future.
static inline uint32 CrcIncrement(uint32 crc, uint32 expected, int index) {
uint32 addition = (expected ^ index);
uint32 carry = (addition & crc) >> 31;
return crc + addition + carry;
}
#endif // STRESSAPPTEST_PATTERN_H_
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