Data from different banks being conflated

[wendelscardua]

The repro below shows the issue (compiled with mos-nes-unrom-clang++ -Os -flto -g -gdwarf-4 -std=c++23 -Wl,-Map,repro.map repro.cpp -o repro.nes).

It defines two identical arrays, foo on bank 1 and bar on bank 2. The main loop calls functions (one on each bank) that prints an element from the respective array.

The thing is, the test1() calls print only zeroes. I think the arrays are being conflated - no sign of foo in either repro.map or repro.mlb, only bar shows up. Whatever test1() is accessing isn't foo (instead it's probably accessing bar's equivalent address on bank 1)

#include <cstdio>
#include <mapper.h>

#pragma clang section text = ".prg_rom_fixed.text"

void put_digit(unsigned char h) { putchar('0' + h); }

#pragma clang section rodata = ".prg_rom_1.rodata"
const unsigned char foo[] = {4, 1, 3};

#pragma clang section rodata = ".prg_rom_2.rodata"
const unsigned char bar[] = {4, 1, 3};

#pragma clang section text = ".prg_rom_1.text"
void test1(unsigned char index) {
  puts("test1");
  put_digit(foo[index]);
  putchar('\n');
}

#pragma clang section text = ".prg_rom_2.text"
void test2(unsigned char index) {
  puts("test2");
  put_digit(bar[index]);
  putchar('\n');
}

#pragma clang section text = ".prg_rom_fixed.text"
int main() {
  for (unsigned char i = 0; i < 3; i++) {
    set_prg_bank(1);
    [[clang::noinline]] test1(i);
    set_prg_bank(2);
    [[clang::noinline]] test2(i);
    set_prg_bank(0);
  }
}