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/*
@author herumi
tiny calculator
This program generates a function to calc the value of
polynomial given by user in run-time.
use boost::spirit::classic
see calc2.cpp for new version of boost::spirit
*/
#include <stdio.h>
#include <sstream>
#include <map>
#define XBYAK_NO_OP_NAMES
#include "xbyak/xbyak.h"
#ifdef _MSC_VER
#pragma warning(disable : 4127) // for boost(constant condition)
#pragma warning(disable : 4512) // for boost
#endif
#include <boost/spirit/include/classic_file_iterator.hpp>
#include <boost/spirit/include/classic_core.hpp>
#include <boost/bind.hpp>
enum Error {
UNDEFINED_VARIABLE = 1
};
/*
JIT assemble of given polynomial for VC or gcc
*/
class FuncGen : public Xbyak::CodeGenerator {
public:
typedef std::map<std::string, int> Map;
private:
enum {
MAX_CONST_NUM = 32
};
double constTbl_[MAX_CONST_NUM];
size_t constTblPos_;
int regIdx_;
Map varMap_; // map var name to index
#ifdef XBYAK32
const Xbyak::Reg32& valTbl_;
const Xbyak::Reg32& tbl_;
#else
const Xbyak::Reg64& valTbl_;
const Xbyak::Reg64& tbl_;
#endif
public:
/*
@param y [out] the value of f(var)
@param var [in] table of input variables
func(double *y, const double var[]);
@note func does not return double to avoid difference of compiler
*/
FuncGen(const std::vector<std::string>& varTbl)
: constTblPos_(0)
, regIdx_(-1)
#ifdef XBYAK32
, valTbl_(eax)
, tbl_(edx)
#elif defined(XBYAK64_WIN)
, valTbl_(rcx)
, tbl_(rdx)
#else
, valTbl_(rdi)
, tbl_(rsi)
#endif
{
#ifdef XBYAK32
mov(valTbl_, ptr[esp+8]); // eax == varTbl
mov(tbl_, (size_t)constTbl_);
#else
#ifdef XBYAK64_WIN
movaps(ptr [rsp + 8], xm6); // save xm6, xm7
movaps(ptr [rsp + 8 + 16], xm7);
#endif
mov(tbl_, (size_t)constTbl_);
#endif
for (int i = 0, n = static_cast<int>(varTbl.size()); i < n; i++) {
varMap_[varTbl[i]] = i;
}
}
// use edx
void genPush(double n)
{
if (constTblPos_ >= MAX_CONST_NUM) throw;
constTbl_[constTblPos_] = n;
if (regIdx_ == 7) throw;
movsd(Xbyak::Xmm(++regIdx_), ptr[tbl_ + (int)(constTblPos_ * sizeof(double))]);
constTblPos_++;
}
// use eax
void genVal(const char *begin, const char *end)
{
std::string var(begin, end);
if (varMap_.find(var) == varMap_.end()) throw UNDEFINED_VARIABLE;
if (regIdx_ == 7) throw;
movsd(Xbyak::Xmm(++regIdx_), ptr[valTbl_ + varMap_[var] * sizeof(double)]);
}
void genAdd(const char*, const char*)
{
addsd(Xbyak::Xmm(regIdx_ - 1), Xbyak::Xmm(regIdx_)); regIdx_--;
}
void genSub(const char*, const char*)
{
subsd(Xbyak::Xmm(regIdx_ - 1), Xbyak::Xmm(regIdx_)); regIdx_--;
}
void genMul(const char*, const char*)
{
mulsd(Xbyak::Xmm(regIdx_ - 1), Xbyak::Xmm(regIdx_)); regIdx_--;
}
void genDiv(const char*, const char*)
{
divsd(Xbyak::Xmm(regIdx_ - 1), Xbyak::Xmm(regIdx_)); regIdx_--;
}
void complete()
{
#ifdef XBYAK32
mov(eax, ptr [esp + 4]); // eax = valTbl
movsd(ptr [eax], xm0);
#else
#ifdef XBYAK64_WIN
movaps(xm6, ptr [rsp + 8]);
movaps(xm7, ptr [rsp + 8 + 16]);
#endif
#endif
ret();
}
};
struct Grammar : public boost::spirit::classic::grammar<Grammar> {
FuncGen& f_;
Grammar(FuncGen& f) : f_(f) { }
template<typename ScannerT>
struct definition {
boost::spirit::classic::rule<ScannerT> poly0, poly1, poly2, var;
definition(const Grammar& self)
{
using namespace boost;
using namespace boost::spirit::classic;
poly0 = poly1 >> *(('+' >> poly1)[bind(&FuncGen::genAdd, ref(self.f_), _1, _2)]
| ('-' >> poly1)[bind(&FuncGen::genSub, ref(self.f_), _1, _2)]);
poly1 = poly2 >> *(('*' >> poly2)[bind(&FuncGen::genMul, ref(self.f_), _1, _2)]
| ('/' >> poly2)[bind(&FuncGen::genDiv, ref(self.f_), _1, _2)]);
var = (+alpha_p)[bind(&FuncGen::genVal, ref(self.f_), _1, _2)];
poly2 = real_p[bind(&FuncGen::genPush, ref(self.f_), _1)]
| var
| '(' >> poly0 >> ')';
}
const boost::spirit::classic::rule<ScannerT>& start() const { return poly0; }
};
};
void put(const std::vector<double>& x)
{
for (size_t i = 0, n = x.size(); i < n; i++) {
if (i > 0) printf(", ");
printf("%f", x[i]);
}
}
int main(int argc, char *argv[])
{
if (argc <= 2) {
fprintf(stderr, "calc \"var1 var2 ...\" \"function of var\"\n");
fprintf(stderr, "eg. calc x \"x*x\"\n");
fprintf(stderr, "eg. calc \"x y z\" \"x*x + y - z\"\n");
return 1;
}
const char *poly = argv[2];
try {
std::vector<std::string> varTbl;
// get varTbl from argv[1]
{
std::istringstream is(argv[1]);
int i = 0;
printf("varTbl = { ");
while (is) {
std::string var;
is >> var;
if (var.empty()) break;
printf("%s:%d, ", var.c_str(), i);
varTbl.push_back(var);
i++;
}
printf("}\n");
}
FuncGen funcGen(varTbl);
Grammar calc(funcGen);
boost::spirit::classic::parse_info<> r = parse(poly, calc, boost::spirit::classic::space_p);
if (!r.full) {
printf("err poly=%s\n", poly);
return 1;
}
funcGen.complete();
std::vector<double> valTbl;
valTbl.resize(varTbl.size());
#ifdef XBYAK32
puts("32bit mode");
void (*func)(double *ret, const double *valTbl) = funcGen.getCode<void (*)(double *, const double*)>();
#else
puts("64bit mode");
double (*func)(const double *valTbl) = funcGen.getCode<double (*)(const double*)>();
#endif
for (int i = 0; i < 10; i++) {
for (size_t j = 0, n = valTbl.size(); j < n; j++) {
valTbl[j] = rand() % 7;
}
double y;
#ifdef XBYAK32
func(&y, &valTbl[0]);
#else
y = func(&valTbl[0]);
#endif
printf("f("); put(valTbl); printf(")=%f\n", y);
}
} catch (std::exception& e) {
printf("ERR:%s\n", e.what());
} catch (Error err) {
printf("ERR:%d\n", err);
} catch (...) {
printf("unknown error\n");
}
return 0;
}
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