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Avoid side effects in argument to SCM_I_INUM.

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* libguile/vm-i-system.c (halt): Avoid side effects in argument to
  SCM_I_INUM.
This commit is contained in:
Mark H Weaver 2014-03-11 20:12:32 -04:00
parent 3b7601cb34
commit 19c0bd22a8
1 changed files with 4 additions and 1 deletions
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5
libguile/vm-i-system.c
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@ -32,8 +32,11 @@ VM_DEFINE_INSTRUCTION (0, nop, "nop", 0, 0, 0)
VM_DEFINE_INSTRUCTION (1, halt, "halt", 0, 0, 0)
{
SCM ret;
SCM nvalues_scm;
nvalues = SCM_I_INUM (*sp--);
nvalues_scm = *sp--; /* SCM_I_INUM may evaluate its argument
more than once. */
nvalues = SCM_I_INUM (nvalues_scm);
NULLSTACK (1);
if (nvalues == 1)