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#include <stdexcept>
#include <cassert>
#include "evaluate.h"
using namespace std;
ExecutionError::ExecutionError(const string &what_arg)
:runtime_error(what_arg){}
ExecutionError::ExecutionError(const char *what_arg)
:runtime_error(what_arg){}
CompilationError::CompilationError(const string &what_arg)
:runtime_error(what_arg){}
CompilationError::CompilationError(const char *what_arg)
:runtime_error(what_arg){}
CompilationError::CompilationError(Site site,const string &what_arg)
:runtime_error(site.filename+":"+to_string(site.lnum)+":"+to_string(site.linex)+": "+what_arg){}
Value::Value()
:type(Type::nil){}
Value::Value(double numval)
:type(Type::number),numval(numval){}
Value::Value(const string &strval)
:type(Type::string),strval(strval){}
Value::Value(ScopeVal *scopeval)
:type(Type::scope),scopeval(scopeval){}
ScopeVal::ScopeVal(const ScopeDef &scopeDef)
:scopeDef(scopeDef){}
namespace A {
struct CollItem{
int count;
void (*deleter)(void*);
};
template <typename T>
static void generic_deleter(void *p){
delete (T*)p;
}
unordered_map<void*,CollItem> collection;
template <typename T>
T* ref(T *p){
auto it=collection.find((void*)p);
if(it==collection.end()){
collection.emplace((void*)p,(CollItem){1,generic_deleter<T>});
} else {
it->second.count++;
}
return p;
}
template <typename T>
void unref(T *p){
auto it=collection.find(p);
assert(it!=collection.end());
if(it->second.count==1){
if(it->second.deleter!=generic_deleter<T>){
throw runtime_error("Unref'd pointer type not the same as the ref'd version!");
}
it->second.deleter(p);
collection.erase(it);
} else {
it->second.count--;
}
}
void unref_all(){
for(const pair<void*,CollItem> &p : collection){
p.second.deleter(p.first);
}
}
}
Assembly::Instruction::Instruction(Type type):type(type){
if(type==Type::pushnum||type==Type::pushstr||type==Type::pushscope||
type==Type::create||type==Type::store||type==Type::load||type==Type::call){
throw runtime_error("Instruction(type) called with invalid type "+to_string((int)type));
}
}
Assembly::Instruction::Instruction(Type type,double num):type(type),num(num){
if(type!=Type::pushnum){
throw runtime_error("Instruction(type,num) called with invalid type "+to_string((int)type));
}
}
Assembly::Instruction::Instruction(Type type,const string &arg):type(type){
if(type==Type::pushstr){
str=arg;
} else if(type==Type::create||type==Type::store||type==Type::load){
name=arg;
} else {
throw runtime_error("Instruction(type,string) called with invalid type "+to_string((int)type));
}
}
Assembly::Instruction::Instruction(Type type,ScopeDef *scope):type(type),scope(scope){
if(type!=Type::pushscope){
throw runtime_error("Instruction(type,scope) called with invalid type "+to_string((int)type));
}
}
Assembly::Instruction::Instruction(Type type,int nargs):type(type),nargs(nargs){
if(type!=Type::call){
throw runtime_error("Instruction(type,nargs) called with invalid type "+to_string((int)type));
}
}
void Assembly::codegen(const StatementList &stl){
for(const Statement &stmt : stl){
codegen(stmt);
}
}
void Assembly::codegen(const Statement &stmt){
switch(stmt.type){
case Statement::Type::create:
codegen(stmt.expr);
listing.emplace_back(Instruction::Type::create,stmt.dstvar);
break;
case Statement::Type::assign:
codegen(stmt.expr);
listing.emplace_back(Instruction::Type::store,stmt.dstvar);
break;
case Statement::Type::expression:
codegen(stmt.expr);
listing.emplace_back(Instruction::Type::pop);
break;
}
}
void Assembly::codegen(const Expression &expr){
switch(expr.type){
case Expression::Type::binop:
codegen(expr.args[0]);
codegen(expr.args[1]);
if(expr.name=="+")listing.emplace_back(Instruction::Type::add);
else if(expr.name=="-")listing.emplace_back(Instruction::Type::sub);
else if(expr.name=="*")listing.emplace_back(Instruction::Type::mul);
else if(expr.name=="/")listing.emplace_back(Instruction::Type::div);
else if(expr.name=="%")listing.emplace_back(Instruction::Type::mod);
else throw runtime_error("Unknown binop name '"+expr.name+"'");
break;
case Expression::Type::unop:
throw runtime_error("No unary operators known?");
case Expression::Type::call:
case Expression::Type::dive:
if(expr.name=="nil"){
if(expr.args.size()!=0||expr.type==Expression::Type::dive){
if(expr.type==Expression::Type::call)throw CompilationError(expr.site,"Cannot call nil");
else throw CompilationError(expr.site,"Cannot dive into nil");
}
listing.emplace_back(Instruction::Type::pushnil);
break;
}
listing.emplace_back(Instruction::Type::load,expr.name);
for(const Expression &arg : expr.args){
codegen(arg);
}
if(expr.args.size()!=0){
listing.emplace_back(Instruction::Type::call,(int)expr.args.size());
}
if(expr.type==Expression::Type::dive){
listing.emplace_back(Instruction::Type::enter);
assert(expr.scope.type==ScopeDef::Type::direct);
codegen(expr.scope.body);
listing.emplace_back(Instruction::Type::leave);
}
break;
case Expression::Type::number:
listing.emplace_back(Instruction::Type::pushnum,expr.numval);
break;
case Expression::Type::string:
listing.emplace_back(Instruction::Type::pushstr,expr.strval);
break;
case Expression::Type::scope:
listing.emplace_back(Instruction::Type::pushscope,new ScopeDef(expr.scope));
break;
}
}
Assembly::Assembly(const StatementList &stl){
codegen(stl);
}
ostream& operator<<(ostream &os,const Assembly &as){
for(const Assembly::Instruction &ins : as.listing){
switch(ins.type){
case Assembly::Instruction::Type::pushnil: os<<"pushnil\n"; break;
case Assembly::Instruction::Type::pushnum: os<<"pushnum "<<ins.num<<"\n"; break;
case Assembly::Instruction::Type::pushstr: os<<"pushstr "<<ins.str<<"\n"; break;
case Assembly::Instruction::Type::pushscope: os<<"pushscope "<<*ins.scope<<"\n"; break;
case Assembly::Instruction::Type::pop: os<<"pop\n"; break;
case Assembly::Instruction::Type::swap: os<<"swap\n"; break;
case Assembly::Instruction::Type::add: os<<"add\n"; break;
case Assembly::Instruction::Type::sub: os<<"sub\n"; break;
case Assembly::Instruction::Type::mul: os<<"mul\n"; break;
case Assembly::Instruction::Type::div: os<<"div\n"; break;
case Assembly::Instruction::Type::mod: os<<"mod\n"; break;
case Assembly::Instruction::Type::create: os<<"create "<<ins.name<<"\n"; break;
case Assembly::Instruction::Type::store: os<<"store "<<ins.name<<"\n"; break;
case Assembly::Instruction::Type::load: os<<"load "<<ins.name<<"\n"; break;
case Assembly::Instruction::Type::enter: os<<"enter\n"; break;
case Assembly::Instruction::Type::leave: os<<"leave\n"; break;
case Assembly::Instruction::Type::call: os<<"call "<<ins.nargs<<"\n"; break;
}
}
return os;
}
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