ruby/wasm/tests/setjmp_test.c

#include "wasm/setjmp.h"
#include "wasm/asyncify.h"
#include "wasm/machine.h"
#include <stdio.h>
#include <assert.h>

void check_direct(void) {
  rb_wasm_jmp_buf buf;
  int val;
  printf("[%s] start\n", __func__);
  printf("[%s] call rb_wasm_setjmp\n", __func__);
  if ((val = rb_wasm_setjmp(buf)) == 0) {
    printf("[%s] rb_wasm_setjmp(buf) == 0\n", __func__);
    printf("[%s] call rb_wasm_longjmp(buf, 2)\n", __func__);
    rb_wasm_longjmp(buf, 2);
    assert(0 && "unreachable after longjmp");
  } else {
    printf("[%s] rb_wasm_setjmp(buf) == %d\n", __func__, val);
    printf("[%s] sp = %p\n", __func__, rb_wasm_get_stack_pointer());
    assert(val == 2 && "unexpected returned value");
  }
  printf("[%s] end\n", __func__);
}

void jump_to_dst(rb_wasm_jmp_buf *dst) {
  rb_wasm_jmp_buf buf;
  printf("[%s] start sp = %p\n", __func__, rb_wasm_get_stack_pointer());
  printf("[%s] call rb_wasm_setjmp\n", __func__);
  if (rb_wasm_setjmp(buf) == 0) {
    printf("[%s] rb_wasm_setjmp(buf) == 0\n", __func__);
    printf("[%s] call rb_wasm_longjmp(dst, 4)\n", __func__);
    rb_wasm_longjmp(*dst, 4);
    assert(0 && "unreachable after longjmp");
  } else {
    assert(0 && "unreachable");
  }
  printf("[%s] end\n", __func__);
}

void check_jump_two_level(void) {
  rb_wasm_jmp_buf buf;
  int val;
  printf("[%s] start\n", __func__);
  printf("[%s] call rb_wasm_setjmp\n", __func__);
  if ((val = rb_wasm_setjmp(buf)) == 0) {
    printf("[%s] rb_wasm_setjmp(buf) == 0\n", __func__);
    printf("[%s] call jump_to_dst(&buf)\n", __func__);
    jump_to_dst(&buf);
    assert(0 && "unreachable after longjmp");
  } else {
    printf("[%s] rb_wasm_setjmp(buf) == %d\n", __func__, val);
    assert(val == 4 && "unexpected returned value");
  }
  printf("[%s] end\n", __func__);
}

void check_reuse(void) {
  rb_wasm_jmp_buf buf;
  int val;
  printf("[%s] start\n", __func__);
  printf("[%s] call rb_wasm_setjmp\n", __func__);
  if ((val = rb_wasm_setjmp(buf)) == 0) {
    printf("[%s] rb_wasm_setjmp(buf) == 0\n", __func__);
    printf("[%s] call rb_wasm_longjmp(buf, 2)\n", __func__);
    rb_wasm_longjmp(buf, 2);
    assert(0 && "unreachable after longjmp");
  } else {
    printf("[%s] rb_wasm_setjmp(buf) == %d\n", __func__, val);
    if (val < 5) {
      printf("[%s] re-call rb_wasm_longjmp(buf, %d)\n", __func__, val + 1);
      rb_wasm_longjmp(buf, val + 1);
    }
  }
  printf("[%s] end\n", __func__);
}

void check_stack_ptr(void) {
  static void *normal_sp;
  rb_wasm_jmp_buf buf;
  normal_sp = rb_wasm_get_stack_pointer();

  printf("[%s] start sp = %p\n", __func__, normal_sp);
  printf("[%s] call rb_wasm_setjmp\n", __func__);
  if (rb_wasm_setjmp(buf) == 0) {
    printf("[%s] call jump_to_dst(&buf)\n", __func__);
    jump_to_dst(&buf);
    assert(0 && "unreachable after longjmp");
  } else {
    printf("[%s] sp = %p\n", __func__, rb_wasm_get_stack_pointer());
    assert(rb_wasm_get_stack_pointer() == normal_sp);
  }
  printf("[%s] end\n", __func__);
}

// top level function should not be inlined to stop unwinding immediately after this function returns
__attribute__((noinline))
int start(int argc, char **argv) {
  check_direct();
  check_jump_two_level();
  check_reuse();
  check_stack_ptr();
  return 0;
}

int main(int argc, char **argv) {
  extern int rb_wasm_rt_start(int (main)(int argc, char **argv), int argc, char **argv);
  return rb_wasm_rt_start(start, argc, argv);
}