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Allow for parse time evaluation of const values.

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The goal is to allow for more evaluation at parse time, in general, to
increase eval time performance.

 - Make AST_Node non-constructable except by derived classes.
 - Make data in AST_Node const (as much as possible).
 - Replace reflection "text = " with replace_child() (where the
   replacement must be with a new parse tree).
 - Evaluate floats, strings, ints, chars at parse time to avoid repeat
   evaluations (~10% speed up in loops in -O3)
This commit is contained in:
Jason Turner
2011-03-27 08:17:04 -06:00
parent bbe89e61bc
commit d6b8e32373
5 changed files with 84 additions and 51 deletions
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83
include/chaiscript/language/chaiscript_common.hpp
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@@ -61,48 +61,57 @@ namespace chaiscript
* The struct that doubles as both a parser ast_node and an AST node
*/
struct AST_Node {
std::string text;
int identifier;
boost::shared_ptr<std::string> filename;
File_Position start, end;
std::vector<AST_NodePtr> children;
AST_NodePtr annotation;
public:
const std::string text;
const int identifier;
boost::shared_ptr<const std::string> filename;
File_Position start, end;
std::vector<AST_NodePtr> children;
AST_NodePtr annotation;
AST_Node(const std::string &t_ast_node_text, int t_id, const boost::shared_ptr<std::string> &t_fname,
int t_start_line, int t_start_col, int t_end_line, int t_end_col) :
text(t_ast_node_text), identifier(t_id), filename(t_fname),
start(t_start_line, t_start_col), end(t_end_line, t_end_col)
{
}
/**
* Prints the contents of an AST node, including its children, recursively
*/
std::string to_string(std::string t_prepend = "") {
std::ostringstream oss;
AST_Node(const std::string &t_ast_node_text, int t_id, const boost::shared_ptr<std::string> &t_fname) :
text(t_ast_node_text), identifier(t_id), filename(t_fname) {}
virtual ~AST_Node() {}
/**
* Prints the contents of an AST node, including its children, recursively
*/
std::string to_string(std::string t_prepend = "") {
std::ostringstream oss;
oss << t_prepend << "(" << ast_node_type_to_string(this->identifier) << ") "
<< this->text << " : " << this->start.line << ", " << this->start.column << std::endl;
for (unsigned int j = 0; j < this->children.size(); ++j) {
oss << this->children[j]->to_string(t_prepend + " ");
oss << t_prepend << "(" << ast_node_type_to_string(this->identifier) << ") "
<< this->text << " : " << this->start.line << ", " << this->start.column << std::endl;
for (unsigned int j = 0; j < this->children.size(); ++j) {
oss << this->children[j]->to_string(t_prepend + " ");
}
return oss.str();
}
return oss.str();
}
std::string internal_to_string() {
return to_string();
}
std::string internal_to_string() {
return to_string();
}
virtual Boxed_Value eval(chaiscript::detail::Dispatch_Engine &)
{
Boxed_Value bv;
throw std::runtime_error("Undispatched ast_node (internal error)");
}
void replace_child(const AST_NodePtr &t_child, const AST_NodePtr &t_new_child)
{
std::replace(children.begin(), children.end(), t_child, t_new_child);
}
protected:
AST_Node(const std::string &t_ast_node_text, int t_id, const boost::shared_ptr<std::string> &t_fname,
int t_start_line, int t_start_col, int t_end_line, int t_end_col) :
text(t_ast_node_text), identifier(t_id), filename(t_fname),
start(t_start_line, t_start_col), end(t_end_line, t_end_col)
{
}
AST_Node(const std::string &t_ast_node_text, int t_id, const boost::shared_ptr<std::string> &t_fname) :
text(t_ast_node_text), identifier(t_id), filename(t_fname) {}
virtual ~AST_Node() {}
virtual Boxed_Value eval(chaiscript::detail::Dispatch_Engine &) {
Boxed_Value bv;
throw std::runtime_error("Undispatched ast_node (internal error)");
}
};