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Fix errors introduced when giving multiple-values objects a tc7

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* libguile/values.c (scm_c_value_ref): Fix a case in which a request for
  the 0th value of a zero-valued object would return the object instead
  of erroring.
* libguile/vm-engine.c (halt): Fix construction of a multiple-valued
  return (off-by-one error).  Fixes a crash introduced in
  4a2d78b4d4.
This commit is contained in:
Andy Wingo 2018-07-16 12:16:58 +02:00
parent 0465c8834e
commit e6461cf1b2
2 changed files with 11 additions and 5 deletions
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2
libguile/vm-engine.c
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@ -335,7 +335,7 @@ VM_NAME (scm_thread *thread)
VM_ASSERT (nvals <= (UINTPTR_MAX >> 8), abort ());
ret = scm_words ((nvals << 8) | scm_tc7_values, nvals + 1);
for (n = 0; n < nvals; n++)
SCM_SET_CELL_OBJECT (ret, n+1, FP_REF (4 + n - 1));
SCM_SET_CELL_OBJECT (ret, n+1, FP_REF (4 + n));
}
VP->ip = SCM_FRAME_RETURN_ADDRESS (VP->fp);