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71 lines
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<title>Full Calls - SBCL Internals</title>
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<a name="Full-Calls"></a>
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Next: <a rel="next" accesskey="n" href="Unknown_002dValues-Returns.html#Unknown_002dValues-Returns">Unknown-Values Returns</a>,
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Previous: <a rel="previous" accesskey="p" href="Local-Calls.html#Local-Calls">Local Calls</a>,
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Up: <a rel="up" accesskey="u" href="Calling-Convention.html#Calling-Convention">Calling Convention</a>
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<h3 class="section">2.3 Full Calls</h3>
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<pre class="example"> ;;; There is something of a cross-product effect with full calls.
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;;; Different versions are used depending on whether we know the
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;;; number of arguments or the name of the called function, and
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;;; whether we want fixed values, unknown values, or a tail call.
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;;;
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;;; In full call, the arguments are passed creating a partial frame on
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;;; the stack top and storing stack arguments into that frame. On
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;;; entry to the callee, this partial frame is pointed to by FP.
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</pre>
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<p>Basically, we use caller-allocated frames, pass an fdefinition,
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function, or closure in <code>EAX</code>,
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argcount in <code>ECX</code>, and first three args in <code>EDX</code>, <code>EDI</code>,
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and <code>ESI</code>. <code>EBP</code> points to just past the start of the frame
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(the first frame slot is at <code>[EBP-4]</code>, not the traditional <code>[EBP]</code>,
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due in part to how the frame allocation works). The caller stores the
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link for the old frame at <code>[EBP-4]</code> and reserved space for a
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return address at <code>[EBP-8]</code>. <code>[EBP-12]</code> appears to be an
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empty slot available to the compiler within a function, it
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may-or-may-not be used by some of the call/return junk. The first stack
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argument is at <code>[EBP-16]</code>. The callee then reallocates the
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frame to include sufficient space for its local variables, after
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possibly converting any <code>&rest</code> arguments to a proper list.
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