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Use vectors for storage, to cut down on cache-misses.

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ADAM David Alan Martin
2025-09-16 22:43:11 -04:00
parent 905a01efd3
commit e8e2027a1a
2 changed files with 19 additions and 10 deletions
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2
js4g/StackMachine.cc
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@ -277,7 +277,7 @@ namespace Dillo::Hydrogen::JavaScriptForge ::detail:: StackMachine_m
int
main()
{
std::deque< std::string > program;
std::vector< std::string > program;
while( std::cin )
{

27
js4g/StackMachine.h
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@ -12,6 +12,9 @@ static_assert( __cplusplus >= 2023'02 );
#include <string>
#include <variant>
#include <deque>
#include <list>
#include <boost/container/flat_map.hpp>
namespace Dillo::Hydrogen::JavaScriptForge ::detail:: StackMachine_m
{
@ -36,20 +39,26 @@ namespace Dillo::Hydrogen::JavaScriptForge ::detail:: StackMachine_m
// It grows on the "back".
// A `std::deque` is used instead of `std::vector`, because
// it helps cut down on large allocations, by subdividing things.
std::deque< std::variant< std::string, Integer > > stack;
std::vector< std::variant< std::string, Integer > > stack;
// TODO: Should these tokens be binary?
// Upside: compressed.
// Downside: more memory management in the machine end?
std::deque< std::string > tokens;
// It's `void *` to break the cycle with itself
struct TokenHolder;
//using Token= std::variant< std::string, TokenHolder * >;
using Token= std::string;
std::vector< std::string > tokens;
struct Tokenizer
{
std::deque< std::string >::const_iterator pos;
std::deque< std::string >::const_iterator end;
std::vector< Token >::const_iterator pos;
std::vector< Token >::const_iterator end;
explicit
Tokenizer( const std::deque< std::string > &tokens )
Tokenizer( const std::vector< Token > &tokens )
: pos( tokens.begin() ), end( tokens.end() ) {}
bool hasNext() const { return pos != end; }
@ -60,8 +69,8 @@ namespace Dillo::Hydrogen::JavaScriptForge ::detail:: StackMachine_m
std::vector< Tokenizer > tokenStack;
std::deque< std::string > wordNames;
std::unordered_map< std::string_view, std::deque< std::string > > words;
std::list< std::string > wordNames;
std::unordered_map< std::string_view, std::vector< std::string > > words;
// Which side of the current conditional to take.
enum ConditionalState { If, Else, Skipped };
@ -78,7 +87,7 @@ namespace Dillo::Hydrogen::JavaScriptForge ::detail:: StackMachine_m
void runWord( std::string_view word );
std::variant< std::string, Integer > pop();
const std::variant< std::string, Integer > &peek();
std::variant< std::string, Integer > &peek();
void push( std::string s );
void push( Integer s );
@ -99,7 +108,7 @@ namespace Dillo::Hydrogen::JavaScriptForge ::detail:: StackMachine_m
StackMachine( std::ostream &output= std::cout );
void
loadProgram( std::deque< std::string > tokens )
loadProgram( std::vector< std::string > tokens )
{
this->tokens= std::move( tokens );
tokenStack.clear();