Function cx_build_bigpkg

tests/test_complexity.c:278–305

Corpus shape #2 — the growing shared package. Real monorepos concentrate * files in a few large packages (org. .common, …), and the JVM filter * branch includes every def sharing the file's namespace — so per-file work * tracks PACKAGE size. A package whose file count scales with the corpus is * therefore the honest reproducer for the #1669 growth pattern that fully * independent modules

 * be linear in k, while a namespace/module-scoped per-file registry build
 * goes quadratic. */
static int cx_build_bigpkg(const char *root, int k) {
    char dir[1024];
    char path[1200];
    snprintf(dir, sizeof(dir), "%s/bigsrc/bigpkg", root);
    if (th_mkdir_p(dir) != 0) {
        return -1;
    }
    int files = k * CX_BIGPKG_FILES_PER_K;
    for (int j = 0; j < files; j++) {
        snprintf(path, sizeof(path), "%s/B%d.java", dir, j);
        FILE *f = fopen(path, "w");
        if (!f) {
            return -1;
        }
        fprintf(f, "package bigpkg;\n\npublic class B%d {\n", j);
        fprintf(f, "    public int val%d(int x) {\n        return x + %d;\n    }\n", j, j);
        if (j > 0) {
            fprintf(f, "    public int chain() {\n");
            fprintf(f, "        B%d prev = new B%d();\n", j - 1, j - 1);
            fprintf(f, "        return prev.val%d(1) + val%d(2);\n    }\n", j - 1, j);
        } else {
            fprintf(f, "    public int chain() {\n        return val0(2);\n    }\n");
        }
        fprintf(f, "}\n");
        fclose(f);
    }
    return 0;
}

/* ── Metrics ─────────────────────────────────────────────────────────── */