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#pragma once
#include <iostream>
#include <string>
#include <unordered_map>
#include "ast.h"
using namespace std;
class CompilationError : public runtime_error{
public:
explicit CompilationError(const string &what_arg);
explicit CompilationError(const char *what_arg);
CompilationError(Site site,const string &what_arg);
};
class ExecutionError : public runtime_error{
public:
explicit ExecutionError(const string &what_arg);
explicit ExecutionError(const char *what_arg);
};
class ScopeVal;
class Value{
public:
enum class Type{
nil,
number, // numval
string, // strval
scope, // scopeval
};
Type type;
double numval;
string strval;
ScopeVal *scopeval;
Value();
Value(double numval);
Value(const string &strval);
Value(ScopeVal *scopeval);
};
class ScopeVal{
public:
ScopeDef scopeDef;
unordered_map<string,Value> values;
ScopeVal(const ScopeDef &scopeDef);
};
namespace A {
template <typename T>
T* ref(T *value);
template <typename T>
void unref(T *value);
void unref_all();
}
class Assembly{
class Instruction{
public:
enum class Type{ // Effect on the value stack is given
pushnil, // [ -> nil]
pushnum, // [ -> this.num]
pushstr, // [ -> this.str]
pushscope, // [ -> this.scope]
pop, // [x -> ]
swap, // [x,y -> y,x]
add, // [x,y -> x+y]
sub, // [x,y -> x-y]
mul, // [x,y -> x*y]
div, // [x,y -> x/y]
mod, // [x,y -> x%y]
create, // [value -> ] Creates binding this.name in the top scope
store, // [value -> ] Stores in the first scope to contain a this.name binding
load, // [ -> value] Retrieves from the first scope to contain a this.name binding
enter, // [scope -> ] Pushes the given scope on the scope stack
leave, // [ -> ] Pops from the scope stack
call, // [scope,arg,...,arg -> scope] Pops this.nargs arguments and replaces for names from scope.scopeDef.args
};
Type type;
double num;
string str;
ScopeDef *scope;
string name;
int nargs;
Instruction(Type type);
Instruction(Type type,double num); // pushnum
Instruction(Type type,const string &str); // pushstr, create, store, load
Instruction(Type type,ScopeDef *scope); // pushscope
Instruction(Type type,int nargs); // call
};
vector<Instruction> listing;
void codegen(const StatementList &stl);
void codegen(const Statement &stmt);
void codegen(const Expression &expr);
public:
Assembly(const StatementList &stl);
friend ostream& operator<<(ostream &os,const Assembly &as);
};
ostream& operator<<(ostream &os,const Assembly &as);
class Context{
vector<ScopeVal> sstack;
public:
void evaluate(const Assembly &as);
};
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