Leahnaya/Poke_Transporter_GB
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Reduce binary size by eliminating libstdc++

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This commit removes all references to things in the libstdc++ library to remove a decent chunk of bloat.

This means every std::to_string() call, std::string and std::vector. (as well as iostream related stuff).

I replaced those with my own versions ptgb::to_string() and ptgb::vector. Especially the latter is not exactly the same,
but close enough.

I also replaced operator new and delete with my own implementation to avoid pulling in everything related to exceptions
from libstdc++

Another problem was the fact that libtonc uses siscanf, which pulls in everything related to the scanf family of functions
and locale support. The worst part of that was that it included a 13KB "categories" symbol from libc_a-categories.o,
which was pulled in because of the locale support integrated into newlibc's siscanf() function. To fix that, I created a
custom, extremely restricted implementation of siscanf. libtonc only used this function to parse at most 2 integers from a
string anyway.
This commit is contained in:
Philippe Symons
2025-04-09 20:04:08 +02:00
parent 7338828331
commit 9268cbd42e
25 changed files with 1763 additions and 199 deletions
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36
source/main.cpp
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@@ -1,8 +1,7 @@
#include <tonc.h>
#include <string>
#include <cstring>
// #include <maxmod.h> //Music
#include "libstd_replacements.h"
#include "flash_mem.h"
#include "interrupt.h"
#include "gb_link.h"
@@ -85,14 +84,16 @@ int test_main(void) Music
// (R + G*32 + B*1024)
#define RGB(r, g, b) (r + (g * 32) + (b * 1024))
// make sure outBuffer is large enough! Should be at least hex_len + 1
template <typename I>
std::string n2hexstr(I w, size_t hex_len = sizeof(I) << 1)
void n2hexstr(char* outBuffer, I w, size_t hex_len = sizeof(I) << 1)
{
static const char *digits = "0123456789ABCDEF";
std::string rc(hex_len, '0');
memset(outBuffer, '0', hex_len);
outBuffer[hex_len] = '\0'; // we must make sure to terminate the string
for (size_t i = 0, j = (hex_len - 1) * 4; i < hex_len; ++i, j -= 4)
rc[i] = digits[(w >> j) & 0x0f];
return rc;
outBuffer[i] = digits[(w >> j) & 0x0f];
}
void load_graphics()
@@ -196,6 +197,7 @@ void first_load_message(void)
int credits()
{
char hexBuffer[16];
#define CREDITS_ARRAY_SIZE 19
int curr_credits_num = 0;
const byte *credits_array[CREDITS_ARRAY_SIZE] = {
@@ -269,9 +271,7 @@ int credits()
create_textbox(4, 1, 160, 80, true);
ptgb_write_debug("Debug info:\n\nG: ", true);
std::string lang;
lang += curr_rom.language;
ptgb_write_debug(lang.c_str(), true);
ptgb_write_debug(ptgb::to_string(curr_rom.language), true);
switch (curr_rom.gamecode)
{
case RUBY_ID:
@@ -290,18 +290,22 @@ int credits()
ptgb_write_debug("-E-", true);
break;
}
ptgb_write_debug(std::to_string(curr_rom.version).c_str(), true);
ptgb_write_debug(ptgb::to_string(curr_rom.version), true);
ptgb_write_debug("\nF: ", true);
ptgb_write_debug(std::to_string(e4_flag).c_str(), true);
ptgb_write_debug(std::to_string(mg_flag).c_str(), true);
ptgb_write_debug(std::to_string(all_collected_flag).c_str(), true);
ptgb_write_debug(ptgb::to_string(e4_flag), true);
ptgb_write_debug(ptgb::to_string(mg_flag), true);
ptgb_write_debug(ptgb::to_string(all_collected_flag), true);
ptgb_write_debug("-", true);
ptgb_write_debug((n2hexstr(pkmn_flags)).c_str(), true);
n2hexstr(hexBuffer, pkmn_flags);
ptgb_write_debug(hexBuffer, true);
ptgb_write_debug("\nS: ", true);
ptgb_write_debug(std::to_string(tutorial).c_str(), true);
ptgb_write_debug(ptgb::to_string(tutorial), true);
ptgb_write_debug("-", true);
ptgb_write_debug((n2hexstr(def_lang)).c_str(), true);
n2hexstr(hexBuffer, def_lang);
ptgb_write_debug(hexBuffer, true);
ptgb_write_debug("\n", true);
ptgb_write_debug(VERSION, true);