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#include <iostream>
#include <vector>
#include <sstream>
#include "Complete.hpp"
#include "Expression.hpp"
#include "Operator.hpp"
#include "EquationSystem.hpp"
#include "MaxStrategy.hpp"
#include "FixpointAlgorithm.hpp"
extern "C" {
#include "EquationSystemParser.h"
#include "EquationSystemLexer.h"
}
using namespace std;
template<typename T>
Expression<T>& treeToExpression(pANTLR3_BASE_TREE node, ConcreteEquationSystem<T>& system) {
ANTLR3_UINT32 num = node->getChildCount(node);
string name = (char*) node->getText(node)->chars;
if (num == 0) {
// leaf node -> constant or variable
if (name == "inf") {
return system.constant(infinity<T>());
} else {
stringstream stream(name);
T output;
if (stream >> output) {
return system.constant(output);
} else {
return system.variable(name);
}
}
}
// anything that's not a constant/variable
std::vector<Expression<T>*> args;
pANTLR3_BASE_TREE childNode;
for (unsigned int i = 0; i < num; ++i) {
childNode = (pANTLR3_BASE_TREE) node->getChild(node, i);
args.push_back(&treeToExpression(childNode, system));
}
if (name == "max") {
return system.maxExpression(args);
} else {
Operator<T>* op = NULL;
if (name == "min") {
op = new Minimum<T>();
} else if (name == "+") {
op = new Addition<T>();
} else if (name == "-") {
if (args.size() == 1) {
op = new Negation<T>();
} else {
op = new Subtraction<T>();
}
} else if (name == ";") {
op = new Comma<T>();
} else if (name == "GUARD") {
op = new Guard<T>();
} else {
throw "Parse error: Unknown operator";
}
return system.expression(op, args);
}
}
template<typename T>
void treeToSystem(pANTLR3_BASE_TREE node, ConcreteEquationSystem<T>& system) {
ANTLR3_UINT32 num = node->getChildCount(node);
if (num % 2 == 1)
throw "Big problem here.";
pANTLR3_BASE_TREE varNode;
pANTLR3_BASE_TREE exprNode;
for (unsigned int i = 0; i < num; i += 2) {
varNode = (pANTLR3_BASE_TREE) node->getChild(node, i);
exprNode = (pANTLR3_BASE_TREE) node->getChild(node, i+1);
string varName = (char*) varNode->getText(varNode)->chars;
Variable<T>& var = system.variable(varName);
vector<Expression<T>*> args;
args.push_back(&system.constant(-infinity<T>()));
args.push_back(&treeToExpression(exprNode, system));
system[var] = &system.maxExpression(args);
}
}
typedef Complete<int> ZBar;
int main (int argc, char* argv[]) {
FixpointAlgorithm<ZBar>* algorithm = NULL;
if (argc > 2 && !strcmp(argv[2], "naive")) {
algorithm = new NaiveFixpointAlgorithm<ZBar>();
cout << "Naive fixpoint" << endl;
} else {
algorithm = new SmartFixpointAlgorithm<ZBar>();
cout << "Smart fixpoint" << endl;
}
pANTLR3_INPUT_STREAM input;
pEquationSystemLexer lex;
pANTLR3_COMMON_TOKEN_STREAM tokens;
pEquationSystemParser parser;
input = antlr3FileStreamNew((pANTLR3_UINT8)argv[1], ANTLR3_ENC_8BIT);
lex = EquationSystemLexerNew(input);
tokens = antlr3CommonTokenStreamSourceNew(ANTLR3_SIZE_HINT, TOKENSOURCE(lex));
parser = EquationSystemParserNew(tokens);
EquationSystemParser_equation_system_return ret = parser -> equation_system(parser);
ConcreteEquationSystem<ZBar> system;
treeToSystem<ZBar>(ret.tree, system);
// DO MORE HERE
cout << system << endl;
VariableAssignment<ZBar>* prev = NULL;
VariableAssignment<ZBar>* result = system.assignment(-infinity<ZBar>());
MaxStrategy<ZBar> strategy(system);
do {
if (prev) delete prev;
prev = result;
strategy.improve(*prev);
for (unsigned int i = 0, size = system.variableCount(); i < size; ++i) {
Variable<ZBar>& var = system.variable(i);
cout << var.name() << " = " << (*result)[var] << ", ";
}
cout << endl;
result = algorithm->maxFixpoint(strategy);
} while(!system.equalAssignments(*prev, *result));
if (prev) delete prev;
VariableAssignment<ZBar>* rho = result;
cout << endl;
for (unsigned int i = 0, size = system.variableCount(); i < size; ++i) {
Variable<ZBar>& var = system.variable(i);
cout << var.name() << " = " << (*rho)[var] << endl;
}
parser -> free(parser);
tokens -> free(tokens);
lex -> free(lex);
input -> close(input);
return 0;
}
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