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| <title>Using as: Type</title> |
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| <a name="g_t_002etype"></a> |
| <h3 class="section">7.115 <code>.type</code></h3> |
| |
| <p>This directive is used to set the type of a symbol. |
| </p> |
| <a name="COFF-Version-2"></a> |
| <h4 class="subheading">COFF Version</h4> |
| |
| <a name="index-COFF-symbol-type"></a> |
| <a name="index-symbol-type_002c-COFF"></a> |
| <a name="index-type-directive-_0028COFF-version_0029"></a> |
| <p>For COFF targets, this directive is permitted only within |
| <code>.def</code>/<code>.endef</code> pairs. It is used like this: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">.type <var>int</var> |
| </pre></div> |
| |
| <p>This records the integer <var>int</var> as the type attribute of a symbol table |
| entry. |
| </p> |
| |
| <a name="ELF-Version-2"></a> |
| <h4 class="subheading">ELF Version</h4> |
| |
| <a name="index-ELF-symbol-type"></a> |
| <a name="index-symbol-type_002c-ELF"></a> |
| <a name="index-type-directive-_0028ELF-version_0029"></a> |
| <p>For ELF targets, the <code>.type</code> directive is used like this: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">.type <var>name</var> , <var>type description</var> |
| </pre></div> |
| |
| <p>This sets the type of symbol <var>name</var> to be either a |
| function symbol or an object symbol. There are five different syntaxes |
| supported for the <var>type description</var> field, in order to provide |
| compatibility with various other assemblers. |
| </p> |
| <p>Because some of the characters used in these syntaxes (such as ‘<samp>@</samp>’ and |
| ‘<samp>#</samp>’) are comment characters for some architectures, some of the syntaxes |
| below do not work on all architectures. The first variant will be accepted by |
| the GNU assembler on all architectures so that variant should be used for |
| maximum portability, if you do not need to assemble your code with other |
| assemblers. |
| </p> |
| <p>The syntaxes supported are: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample"> .type <name> STT_<TYPE_IN_UPPER_CASE> |
| .type <name>,#<type> |
| .type <name>,@<type> |
| .type <name>,%<type> |
| .type <name>,"<type>" |
| </pre></div> |
| |
| <p>The types supported are: |
| </p> |
| <dl compact="compact"> |
| <dt><code>STT_FUNC</code></dt> |
| <dt><code>function</code></dt> |
| <dd><p>Mark the symbol as being a function name. |
| </p> |
| </dd> |
| <dt><code>STT_GNU_IFUNC</code></dt> |
| <dt><code>gnu_indirect_function</code></dt> |
| <dd><p>Mark the symbol as an indirect function when evaluated during reloc |
| processing. (This is only supported on assemblers targeting GNU systems). |
| </p> |
| </dd> |
| <dt><code>STT_OBJECT</code></dt> |
| <dt><code>object</code></dt> |
| <dd><p>Mark the symbol as being a data object. |
| </p> |
| </dd> |
| <dt><code>STT_TLS</code></dt> |
| <dt><code>tls_object</code></dt> |
| <dd><p>Mark the symbol as being a thead-local data object. |
| </p> |
| </dd> |
| <dt><code>STT_COMMON</code></dt> |
| <dt><code>common</code></dt> |
| <dd><p>Mark the symbol as being a common data object. |
| </p> |
| </dd> |
| <dt><code>STT_NOTYPE</code></dt> |
| <dt><code>notype</code></dt> |
| <dd><p>Does not mark the symbol in any way. It is supported just for completeness. |
| </p> |
| </dd> |
| <dt><code>gnu_unique_object</code></dt> |
| <dd><p>Marks the symbol as being a globally unique data object. The dynamic linker |
| will make sure that in the entire process there is just one symbol with this |
| name and type in use. (This is only supported on assemblers targeting GNU |
| systems). |
| </p> |
| </dd> |
| </dl> |
| |
| <p>Note: Some targets support extra types in addition to those listed above. |
| </p> |
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