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<h1><a name="parrot_calling_conventions_state_table"
>parrot calling conventions state table</a></h1>

<p>this document expresses the calling conventions as outlined in PDD03 in table format.
this is a work in progress,
which,
when finished,
should assist in creating an exhaustive test suite for calling conventions.</p>

<pre>              1      2      3      4      5      6      7      8      9

           |                          DEST                         |      |
           |          unnamed          |           named         *3|      |
           |   required  |   optional  |   required  |   optional  |      |
           |      |    *1|      |    *1|      |    *1|      |    *1|      |
           | nrml | slrp | nrml | slrp | nrml | slrp | nrml | slrp | END  |
   &#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;
           |      |      |      |      |      |      |      |      |      |
 A    nrml |  P1  |  P2  |  P1  |  P2  |  E6  |  E6  |  E6  |  E6  |  E1  |
    u      |      |      |      |      |      |      |      |      |      |
    n&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;
    n  *1,2|      |      |      |      |      |      |      |      |      |
 B  a flat |  P3  |  P3  |  P3  |  P3  |  P4  |  P5  | P4   |  P5  |  E2  |
    m      |      |      |      |      |      |      |      |      |      |
    e&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;
    d    *1|      |      |      |      |      |      |      |      |      |
 C    mayb |  P1  |  X1  |  P1  |  X1  |      |      |      |      |  E2  |
   S       |      |      |      |      |      |      |      |      |      |
   R&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;
   C       |      |      |      |      |      |      |      |      |      |
 D    nrml |  E5  |  E5  |  E5  |  E5  |      |      |      |      |  E1  |
           |      |      |      |      |      |      |      |      |      |
    n&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;
    a    *3|      |      |      |      |      |      |      |      |      |
 E  m flat |  E5  |  E5  |  E5  |  E5  |      |      |      |      |  E2  |
    e      |      |      |      |      |      |      |      |      |      |
    d&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;
           |      |      |      |      |      |      |      |      |      |
 F    mayb |  E4  |  E4  |  E4  |  E4  |  E4  |  E4  |  E4  |  E4  |  E2  |
           |      |      |      |      |      |      |      |      |      |
   &#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;
           |      |      |      |      |      |      |      |      |      |
 G     END |  E3  |  E3  |  D1  |  D1  |  E3  |  E3  |  D1  |  D1  |  D1  |
           |      |      |      |      |      |      |      |      |      |
   &#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;</pre>

<h2><a name="Glossary"
>Glossary</a></h2>

<dl>
<dt><a name="Flag_Values"
>Flag Values</a></dt>

<pre>  nrml  no flags   (src: val &#38; 0x03a0 = 0; dest: val &#38; 0x0260 = 0)
  slrp  SLURPY     (val &#38; 0x0020 = 1)
  flat  FLAT       (val &#38; 0x0020 = 1)</pre>

<dt><a name="Passing"
>Passing</a></dt>

<pre>  P1  pass as&#45;is, next state
  P2  pass as&#45;is, next src
  P3  pass contents as array items, next
  P4  pass current array item as&#45;is, next src array item
  P5  pass current array items as pairs (a[0],a[0]) or as (a[0],a[1]) (a.size % 2 = 0)
  P4  pass current array item as&#45;is, next src array item
  P5  pass current array items as pairs (a[0],a[0]) or as (a[0],a[1]) (a.size % 2 = 0)</pre>

<dt><a name="Expressions"
>Expressions</a></dt>

<pre>  X1  if(src pmc is aggregate or reference to aggregate)
        if dest is array, pass as flat
        if dest is hash, pass as pairs</pre>

<dt><a name="Errors"
>Errors</a></dt>

<pre>  E1  overflow
  E2  overflow if aggregate is not empty
  E3  underflow
  E4  [removed]
  E5  named parameter passed, unnamed expected
  E6  unnamed parameter passed, named expected</pre>

<dt><a name="Done"
>Done</a></dt>

<pre>  D1  done</pre>

<dt><a name="Notes"
>Notes</a></dt>

<pre>  *1  pmc only
  *2  error unless pmc is aggregate or reference to aggregate
  *3  pmc or string constant only</pre>
</dl>

<h2><a name="Examples"
>Examples</a></h2>

<dl>
<dt><a name="A:5_&#39;caller&#39;(1,_2)_#_caller_.param_pmc_two_:named(&#39;two&#39;)_;_.param_pmc_one_:named(&#39;one&#39;)_two_=_1_;_one_=_2"
>A:5 &#39;caller&#39;(1, 2) # caller .param pmc two :named(&#39;two&#39;) ; .param pmc one :named(&#39;one&#39;) two = 1 ; one = 2</a></dt>
</dl>
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