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Interpreter.cpp
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Interpreter.cpp
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#include "Forward.h"
#include "AST.h"
#include "Interpreter.h"
#include "Object.h"
#include "Table.h"
#include "Error.h"
#include "Terminal.h"
Interpreter::Interpreter()
:is_interactive(false)
{
}
//Fair warning: In this context Interpreter doesn't ensure that its Program will not be garbage collected in a higher scope.
Interpreter::Interpreter(Program& p, bool interact = false)
:is_interactive(interact)
{
prog = &p;
globalscope = p.globals;
}
Value Interpreter::execute(Program& program, Value& jarg)
{
prog = &program;
Function* main = prog->get_func("main");
if (!main)
{
RuntimeError(main, "/main() is not defined!");
exit(1); // HAS to be a forced-exit since this crashes the .exe otherwise!
}
std::vector<Value> jargs = {jarg};
main->give_args(*this,jargs,nullptr);
Value ret = main->resolve(*this);
if(error)
UncaughtRuntime(error);
return ret;
}
Value Interpreter::evaluate_expression(ASTNode* node) {
Value ret = node->resolve(*this);
return ret;
}
void Interpreter::RuntimeError(ASTNode* a, const std::string& what)
{
//Stack dump
if(objectscope.empty() || blockscope.empty()) UNLIKELY {// Can't stack dump if we never entered the program (a lack of a /main() function does this)
if(a) // if we should have some data
throw error::interpreter("Unknown runtime error, no stacktrace available!");
//if we shouldn't (this is the path that no /main() gets you to)
//NOTE: Although I want to point out that this shouldn't happen --
// Parser should throw a fit about there being no main way before interpretation occurs!
exit(1);
}
std::string whatFunction;
if(objectscope.top()) // If we runtimed within a method
{
whatFunction = "method of object of type " + objectscope.top()->object_type.to_string();
}
else
{
whatFunction = "global function";
}
std::string lineNumber;
if(a && a->my_line)
lineNumber = std::to_string(a->my_line);
else
lineNumber = "Unknown!"; // Eventually things should be configured to never do this
std::string errorHeader = "\nRuntime in " + blockscope.top().get_back_name().to_string() + ", a " + whatFunction + ", Line number: " + lineNumber + "\n";
#ifdef JOAO_SAFE
throw error::interpreter(errorHeader + what);
#else
Terminal::SetColor(std::cerr,Terminal::Color::Red);
Terminal::SetBold(std::cerr,true);
std::cerr << errorHeader;
Terminal::ClearFormatting(std::cerr);
std::cerr << what;
if(!is_interactive)
exit(1);
#endif
}
void Interpreter::RuntimeError([[maybe_unused]] ASTNode* node, ErrorCode err,const std::string& what)
{
error = Value(prog->definedObjTypes["/error"]->makeObject(*this, {Value(static_cast<int>(err)),Value(what) }));
//assert(error.t_value.as_object_ptr->get_property_raw("what").t_vType == Value::vType::String);
return;
}
void Interpreter::RuntimeError([[maybe_unused]] ASTNode* node, Value& err_val)
{
error = err_val;
return;
}
void Interpreter::UncaughtRuntime(const Value& err)
{
if(err.t_vType != Value::vType::Object) UNLIKELY {
exit(-(1 << 16));
}
std::cerr << *(err.t_value.as_object_ptr->get_property(*this, "what").t_value.as_string_ptr);
#ifdef JOAO_SAFE
throw err;
#else
int code = err.t_value.as_object_ptr->get_property(*this, "code").t_value.as_int;
std::cout.flush();
if (code)
exit(code);
else
exit(-(1 << 16));
#endif
}
void Interpreter::init_var(const ImmutableString& varname, const Value& val, [[maybe_unused]] ASTNode* setter)
{
#ifdef JOAO_SAFE
++value_init_count;
if (value_init_count > MAX_VARIABLES)
{
throw error::max_variables(std::string("Program reached the limit of ") + std::to_string(MAX_VARIABLES) + std::string("instantiated variables!"));
}
#endif
blockscope.top().set(varname, val);
}
void Interpreter::override_var(const ImmutableString& varname, Value val, ASTNode* setter)
{
//First try blockscope
Scope<Value>& varscope = blockscope.top();
Value* vptr = varscope.get(varname);
if (vptr)
{
varscope.Override(varname, val);
return;
}
//Then try objectscope
Object* objscope = objectscope.top();
if (objscope)
{
vptr = objscope->has_property(*this, varname);
if (vptr)
{
objscope->set_property(*this, varname, val);
return;
}
}
//Then try globalscope
if (globalscope.table.count(varname))
{
globalscope.table[varname] = val;
return;
}
//Give up. How the hell did we even fail to set it in globalscope?
RuntimeError(setter, "Unable to override value of variable named " + varname.to_string() + "!");
}
Value& Interpreter::get_var(const ImmutableString& varname, ASTNode *getter)
{
//First try blockscope
Scope<Value>& varscope = blockscope.top();
Value* vptr = varscope.get(varname);
if (vptr)
return *vptr;
//Then try objectscope
Object* objscope = objectscope.top();
if(objscope)
{
vptr = objscope->has_property(*this, varname);
if (vptr)
return *vptr;
}
//Then try globalscope
Value* globptr = globalscope.table.lazy_at(varname);
if (globptr)
return *globptr;
//Give up :(
RuntimeError(getter, ErrorCode::BadAccess, std::string("Unable to access variable named ") + varname.to_string() + std::string("!"));
return Value::dev_null;
}
Function* Interpreter::get_func(const std::string& funkname, ASTNode *caller, bool loud)
{
//Try to find an objectscope function with this name
Object* obj = objectscope.top();
if (obj)
{
Function* method = obj->has_method(*this, funkname);
if (method)
return method;
}
//Try to find a global function with this name
if (prog->definedFunctions.count(funkname))
{
return prog->get_func(funkname);
}
if(loud)
RuntimeError(caller, ErrorCode::BadAccess, "Failed to find function named " + funkname + "!");
return nullptr;
}
Value Interpreter::get_property(const ImmutableString& str, ASTNode* getter)
{
Object* obj = objectscope.top();
if (obj)
{
return obj->get_property(*this,str);
}
RuntimeError(getter, ErrorCode::BadMemberAccess, "Failed to get property of Parent objectscope!");
return Value();
}
void Interpreter::set_property(const ImmutableString& str, Value val, ASTNode* getter)
{
Object* obj = objectscope.top();
if (obj)
{
obj->set_property(*this, str, val);
return;
}
RuntimeError(getter, ErrorCode::BadMemberAccess, "Failed to set property of Parent objectscope!");
return;
}
Value Interpreter::grand_property(unsigned int depth, const ImmutableString& str, ASTNode* getter)
{
Object* obj = objectscope.top();
if (!obj)
{
RuntimeError(getter, ErrorCode::BadMemberAccess, "Cannot get grandparent property in classless objectscope!");
return Value();
}
std::string dir = obj->object_type.to_string();
for (unsigned int i = 0; i < depth; ++i)
{
dir = Directory::DotDot(dir);
}
if (dir == "/")
{
RuntimeError(getter, ErrorCode::BadMemberAccess, "Attempted to get grandparent of root directory!");
return Value();
}
if (!prog->definedObjTypes.count(dir))
{
RuntimeError(getter, ErrorCode::BadMemberAccess, "Failed to find objecttype of type " + dir + " during GrandparentAccess!"); // This'll be a weird error to get once inheritence is functional
return Value();
}
ObjectType* objt = prog->definedObjTypes.at(dir);
return objt->get_typeproperty(*this, str, getter);
}
Value& Interpreter::grand_handle(unsigned int depth, const ImmutableString& str, ASTNode* getter)
{
Object* obj = objectscope.top();
if (!obj)
{
RuntimeError(getter, ErrorCode::BadMemberAccess, "Cannot get grandparent handle in classless objectscope!");
return Value::dev_null;
}
std::string dir = obj->object_type.to_string();
for (unsigned int i = 0; i < depth; ++i)
{
dir = Directory::DotDot(dir);
}
if (dir == "/")
{
RuntimeError(getter, ErrorCode::BadMemberAccess, "Attempted to get grandparent handle of root directory!");
return Value::dev_null;
}
if (!prog->definedObjTypes.count(dir))
{
RuntimeError(getter, ErrorCode::BadMemberAccess, "Failed to find objecttype of type " + dir + " during GrandparentAccess!"); // This'll be a weird error to get once inheritence is functional
return Value::dev_null;
}
ObjectType* objt = prog->definedObjTypes.at(dir);
//If it's a property
Value* vuh = objt->has_typeproperty(*this, str, getter);
if (vuh)
{
return *vuh;
}
//If it's a method
Function* fnuh = objt->has_typemethod(*this, str, getter);
if (fnuh)
{
return fnuh->to_value();
}
RuntimeError(getter, ErrorCode::BadMemberAccess, "Failed to get property of Parent objectscope!");
return Value::dev_null;
}
Value Interpreter::makeObject(std::string str, std::vector<ASTNode*>& args, ASTNode* maker)
{
if (!(prog->definedObjTypes.contains(str)))
RuntimeError(maker, "Constructor attempts to instantiate unknown type! (" + str + ")"); // FIXME: This should really be a Parsetime error
std::vector<Value> eval_args;
for (size_t i = 0; i < args.size(); ++i)
{
eval_args.push_back(args[i]->resolve(*this));
if (this->error) // Ohp, the arguments were bad!
return Value();
}
return Value(prog->definedObjTypes[str]->makeObject(*this, std::move(eval_args)));
}
Value Interpreter::makeObject(std::string str, std::vector<Value>&& eval_args, ASTNode* maker)
{
if (!(prog->definedObjTypes.contains(str)))
RuntimeError(maker, "Constructor attempts to instantiate unknown type! (" + str + ")"); // FIXME: This should really be a Parsetime error
return Value(prog->definedObjTypes[str]->makeObject(*this, std::move(eval_args)));
}
Value Interpreter::makeBaseTable()
{
return Value(prog->definedObjTypes["/table"]->makeObject(*this, {}));
}
Value Interpreter::makeBaseTable( std::vector<Value> elements, Hashtable<std::string,Value> entries, [[maybe_unused]] ASTNode* maker = nullptr)
{
Object* objdesk = prog->definedObjTypes["/table"]->makeObject(*this,{});
Table* desk = static_cast<Table*>(objdesk);
for(size_t i = 0; i < elements.size(); ++i)
{
desk->at_set(*this,Value(i), elements[i]);
}
for(auto it = entries.begin(); it != entries.end(); ++it)
{
desk->at_set(*this,Value(it.key()), it.value());
}
return Value(objdesk);
}