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CodeRunner.cpp
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CodeRunner.cpp
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/* Copyright (C)
* 2012 - Zheng Sun (http://pursuer.me)
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <vector>
#include "CodeRunner.h"
#include "Exception.h"
#include "Utils.h"
Variable::Variable(){
}
Variable::Variable(const string &type, const string &value) : type(type), value(value){
}
Variable::Variable(const Variable &variable) : type(variable.type), value(variable.value){
}
Variable &Variable::operator = (const Variable &variable){
type = variable.type;
value = variable.value;
return *this;
}
void CodeRunner::execute(const vector <string> &codes){
map <int, map <string, Variable *> > variables;
map <string, int> labels;
vector <pair <int, string> > call_stack;
vector <vector <int> > scopes_stack;
vector <Variable> variable_stack;
int scopes_count = 0;
for (int i = 0; i < codes.size(); i ++)
if (codes[i].length() > 0 && codes[i][codes[i].length() - 1])
labels[codes[i].substr(0, codes[i].length() - 1)] = i;
if (labels.find("L.main") == labels.end()) throw Exception("ERROR: Cannot find the entry of the code.");
call_stack.push_back(make_pair(-1, "#"));
scopes_stack.push_back(vector <int>());
for (int location = labels["L.main"]; ; location ++){
const string &cmd = codes[location];
vector <int> &cur_scopes = scopes_stack[scopes_stack.size() - 1];
if (cur_scopes.size() == 0) cur_scopes.push_back(++ scopes_count);
int cur_scope = cur_scopes[cur_scopes.size() - 1];
if (cmd == "SCOPE"){
scopes_count ++;
cur_scopes.push_back(scopes_count);
} else if (cmd == "ENDSCOPE"){
cur_scopes.pop_back();
if (variables.find(cur_scope) != variables.end())
for (map <string, Variable *>::iterator it = variables[cur_scope].begin(); it != variables[cur_scope].end(); it ++) delete it -> second;
} else if (cmd.substr(0, 7) == "ASSIGN\t"){
char s1[100], s2[100];
sscanf(cmd.c_str(), "%*s%s%s", s1, s2);
string a = s1, b = s2;
if (b == "int" || b == "double"){
if (getVariable_p(variables, cur_scopes, a))
throw Exception("ERROR: Duplicate variable allocation " + a + " on line " + Utils::toString(location + 1) + ".");
variables[cur_scope][a] = new Variable(b, "0");
} else if (b[0] <= '9' && b[0] >= '0'){
Variable *va = getVariable_p(variables, cur_scopes, a);
if (!va) variables[cur_scope][a] = new Variable(b.find('.') != string::npos ? "double" : "int", b);
else {
if (va -> type == "int") va -> value = Utils::toString(atoi(b.c_str()));
else va -> value = Utils::toString(atof(b.c_str()));
}
} else {
Variable *va = getVariable_p(variables, cur_scopes, a);
Variable *vb = getVariable_p(variables, cur_scopes, b);
if (!vb) throw Exception("ERROR: Unknown variable " + b + " on line " + Utils::toString(location + 1) + ".");
if (!va){
if (a.substr(0, 2) != "t.") throw Exception("ERROR: Unknown variable " + a + " on line " + Utils::toString(location + 1) + ".");
else variables[cur_scope][a] = new Variable(*vb);
} else {
if (va -> type == "int") va -> value = Utils::toString(atoi(vb -> value.c_str()));
else va -> value = Utils::toString(atof(vb -> value.c_str()));
}
}
} else if (cmd.substr(0, 4) == "ADD\t" || cmd.substr(0, 4) == "SUB\t" || cmd.substr(0, 4) == "MUL\t" || cmd.substr(0, 4) == "DIV\t"){
char s1[100], s2[100];
sscanf(cmd.c_str(), "%*s%s%s", s1, s2);
string a = s1, b = s2;
Variable *va = getVariable_p(variables, cur_scopes, a);
Variable *vb = getVariable_p(variables, cur_scopes, b);
if (!va) throw Exception("ERROR: Unknown variable " + a + " on line " + Utils::toString(location + 1) + ".");
if (!vb) throw Exception("ERROR: Unknown variable " + b + " on line " + Utils::toString(location + 1) + ".");
if (va -> type == "double" || vb -> type == "double"){
double a = atof(va -> value.c_str());
double b = atof(vb -> value.c_str());
double result = a;
string sc = cmd.substr(0, 4);
if (sc == "ADD\t") result += b;
else if (sc == "SUB\t") result -= b;
else if (sc == "MUL\t") result *= b;
else if (sc == "DIV\t") result /= b;
if (va -> type == "int") va -> value = Utils::toString((int)result);
else va -> value = Utils::toString(result);
} else {
int a = atoi(va -> value.c_str());
int b = atoi(vb -> value.c_str());
string sc = cmd.substr(0, 4);
if (sc == "ADD\t") va -> value = Utils::toString(a + b);
else if (sc == "SUB\t") va -> value = Utils::toString(a - b);
else if (sc == "MUL\t") va -> value = Utils::toString(a * b);
else if (sc == "DIV\t") va -> value = Utils::toString(a / b);
}
} else if (cmd.substr(0, 5) == "BEQZ\t" || cmd.substr(0, 5) == "BGEZ\t" || cmd.substr(0, 5) == "BGTZ\t" || cmd.substr(0, 5) == "BLEZ\t" || cmd.substr(0, 5) == "BLTZ\t"){
char s1[100], s2[100];
sscanf(cmd.c_str(), "%*s%s%s", s1, s2);
string a = s1, b = s2;
Variable *va = getVariable_p(variables, cur_scopes, a);
if (!va) throw Exception("ERROR: Unknown variable " + a + " on line " + Utils::toString(location + 1) + ".");
if (labels.find(b) == labels.end()) throw Exception("ERROR: Unknown label " + b + " on line " + Utils::toString(location + 1) + ".");
int should_jmp = 0;
string sc = cmd.substr(0, 5);
if (va -> type == "double"){
double a = atof(va -> value.c_str());
if (sc == "BEQZ\t" && a == 0.0) should_jmp = 1;
else if (sc == "BGEZ\t" && a >= 0.0) should_jmp = 1;
else if (sc == "BGTZ\t" && a > 0.0) should_jmp = 1;
else if (sc == "BLEZ\t" && a <= 0.0) should_jmp = 1;
else if (sc == "BLTZ\t" && a < 0.0) should_jmp = 1;
} else {
int a = atoi(va -> value.c_str());
if (sc == "BEQZ\t" && a == 0.0) should_jmp = 1;
else if (sc == "BGEZ\t" && a >= 0.0) should_jmp = 1;
else if (sc == "BGTZ\t" && a > 0.0) should_jmp = 1;
else if (sc == "BLEZ\t" && a <= 0.0) should_jmp = 1;
else if (sc == "BLTZ\t" && a < 0.0) should_jmp = 1;
}
if (should_jmp) location = labels[b];
} else if (cmd.substr(0, 2) == "J\t"){
char s1[100];
sscanf(cmd.c_str(), "%*s%s", s1);
if (labels.find(s1) == labels.end()) throw Exception("ERROR: Unknown label " + string(s1) + " on line " + Utils::toString(location + 1) + ".");
location = labels[s1];
} else if (cmd.substr(0, 5) == "PUSH\t"){
char s1[100];
sscanf(cmd.c_str(), "%*s%s", s1);
string a = s1;
Variable *va = getVariable_p(variables, cur_scopes, a);
if (!va) throw Exception("ERROR: Unknown variable " + a + " on line " + Utils::toString(location + 1) + ".");
variable_stack.push_back(*va);
} else if (cmd.substr(0, 4) == "POP\t"){
char s1[100];
sscanf(cmd.c_str(), "%*s%s", s1);
string a = s1;
Variable *va = getVariable_p(variables, cur_scopes, a);
if (!va) throw Exception("ERROR: Unknown variable " + a + " on line " + Utils::toString(location + 1) + ".");
(*va) = variable_stack[variable_stack.size() - 1];
variable_stack.pop_back();
} else if (cmd.substr(0, 5) == "CALL\t"){
char s1[100], s2[100];
sscanf(cmd.c_str(), "%*s%s%s", s1, s2);
string a = s1, b = s2;
Variable *vb = getVariable_p(variables, cur_scopes, b);
if (labels.find(a) == labels.end()) throw Exception("ERROR: Unknown label " + a + " on line " + Utils::toString(location + 1) + ".");
if (!vb) variables[cur_scope][b] = new Variable("double", "0");
call_stack.push_back(make_pair(location, b));
scopes_stack.push_back(vector <int>());
location = labels[a];
} else if (cmd.substr(0, 4) == "RET\t"){
char s1[100];
sscanf(cmd.c_str(), "%*s%s", s1);
string a = s1;
Variable *va = getVariable_p(variables, cur_scopes, a);
if (!va) throw Exception("ERROR: Unknown variable " + a + " on line " + Utils::toString(location + 1) + ".");
scopes_stack.pop_back();
if (scopes_stack.size() == 0) break;
const vector <int> &cs = scopes_stack[scopes_stack.size() - 1];
Variable *vret = getVariable_p(variables, cs, call_stack[call_stack.size() - 1].second);
*vret = *va;
location = call_stack[call_stack.size() - 1].first;
call_stack.pop_back();
}
printf("After %d:", location + 1);
for (int i = 0; i < cur_scopes.size(); i ++){
if (variables.find(cur_scopes[i]) == variables.end()) continue;
for (map <string, Variable *>::iterator it = variables[cur_scopes[i]].begin(); it != variables[cur_scopes[i]].end(); it ++)
if (it -> first.substr(0, 2) != "t.") printf("\t%s:%s", it -> first.c_str(), it -> second -> value.c_str());
}
printf("\n");
}
}
Variable *CodeRunner::getVariable_p(const map <int, map <string, Variable *> > &variables, const vector <int> &cur_scopes, const string &name){
for (int i = 0; i < cur_scopes.size(); i ++){
map <int, map <string, Variable *> >::const_iterator it = variables.find(cur_scopes[i]);
if (it != variables.end()){
map <string, Variable *>::const_iterator itx = it -> second.find(name);
if (itx != it -> second.end()) return itx -> second;
}
}
return 0;
}