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FFI: Box all accessed or returned enums.

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This commit is contained in:
Mike Pall
2012-07-17 22:20:03 +02:00
parent 2139c6791f
commit 4d9c29a78c
11 changed files with 121 additions and 60 deletions
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23
doc/ext_ffi_semantics.html
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@@ -250,19 +250,20 @@ constant values; retrieving return values from C calls:
<tr class="even separate">
<td class="convin"><tt>bool</tt></td><td class="convop">0 &rarr; <tt>false</tt>, otherwise <tt>true</tt></td><td class="convout">boolean</td></tr>
<tr class="odd separate">
<td class="convin">Complex number</td><td class="convop">boxed value</td><td class="convout">complex cdata</td></tr>
<td class="convin"><tt>enum</tt></td><td class="convop">boxed value</td><td class="convout">enum cdata</td></tr>
<tr class="even">
<td class="convin">Complex number</td><td class="convop">boxed value</td><td class="convout">complex cdata</td></tr>
<tr class="odd">
<td class="convin">Vector</td><td class="convop">boxed value</td><td class="convout">vector cdata</td></tr>
<tr class="odd">
<tr class="even">
<td class="convin">Pointer</td><td class="convop">boxed value</td><td class="convout">pointer cdata</td></tr>
<tr class="even separate">
<tr class="odd separate">
<td class="convin">Array</td><td class="convop">boxed reference</td><td class="convout">reference cdata</td></tr>
<tr class="odd">
<tr class="even">
<td class="convin"><tt>struct</tt>/<tt>union</tt></td><td class="convop">boxed reference</td><td class="convout">reference cdata</td></tr>
</table>
<p>
Bitfields or <tt>enum</tt> types are treated like their underlying
type.
Bitfields are treated like their underlying type.
</p>
<p>
Reference types are dereferenced <em>before</em> a conversion can take
@@ -715,6 +716,10 @@ is performed. Otherwise both sides are converted to an
<tt>int64_t</tt> and a signed arithmetic operation is performed. The
result is a boxed 64&nbsp;bit cdata object.<br>
If one of the operands is an <tt>enum</tt> and the other operand is a
string, the string is converted to the value of a matching <tt>enum</tt>
constant before the above conversion.<br>
These rules ensure that 64&nbsp;bit integers are "sticky". Any
expression involving at least one 64&nbsp;bit integer operand results
in another one. The undefined cases for the division, modulo and power
@@ -740,7 +745,11 @@ cdata number and a Lua number can be compared with each other. If one
of them is an <tt>uint64_t</tt>, the other side is converted to an
<tt>uint64_t</tt> and an unsigned comparison is performed. Otherwise
both sides are converted to an <tt>int64_t</tt> and a signed
comparison is performed.</li>
comparison is performed.<br>
If one of the operands is an <tt>enum</tt> and the other operand is a
string, the string is converted to the value of a matching <tt>enum</tt>
constant before the above conversion.<br>
<li><b>Comparisons for equality/inequality</b> never raise an error.
Even incompatible pointers can be compared for equality by address. Any