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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inter Modules</a></li><li><a href="index.html">bytecode</a></li><li><a href="index.html#5">Chapter 5: Code Constructs</a></li><li><b>The Cast Construct</b></li></ul><p class="purpose">Defining the cast construct.</p>
<p class="inwebparagraph"><a id="SP1"></a><b>&#167;1. </b></p>
<pre class="definitions">
<span class="definitionkeyword">enum</span> <span class="constant">CAST_IST</span>
</pre>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Inter::Cast::define<button class="popup" onclick="togglePopup('usagePopup501')">...<span class="popuptext" id="usagePopup501">Usage of <b>Inter::Cast::define</b>:<br>Definition - <a href="3-dfn.html#SP3">&#167;3</a></span></button></span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
<span class="reserved">inter_construct</span><span class="plain"> *</span><span class="identifier">IC</span><span class="plain"> = </span><span class="functiontext"><a href="3-dfn.html#SP1">Inter::Defn::create_construct</a></span><span class="plain">(</span>
<span class="constant">CAST_IST</span><span class="plain">,</span>
<span class="identifier">L</span><span class="string">"cast (%i+) &lt;- (%i+)"</span><span class="plain">,</span>
<span class="identifier">I</span><span class="string">"cast"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"casts"</span><span class="plain">);</span>
<span class="identifier">IC</span><span class="plain">-&gt;</span><span class="element">min_level</span><span class="plain"> = </span><span class="constant">1</span><span class="plain">;</span>
<span class="identifier">IC</span><span class="plain">-&gt;</span><span class="element">max_level</span><span class="plain"> = </span><span class="constant">100000000</span><span class="plain">;</span>
<span class="identifier">IC</span><span class="plain">-&gt;</span><span class="element">usage_permissions</span><span class="plain"> = </span><span class="constant">INSIDE_CODE_PACKAGE</span><span class="plain"> + </span><span class="constant">CAN_HAVE_CHILDREN</span><span class="plain">;</span>
<span class="identifier">METHOD_ADD</span><span class="plain">(</span><span class="identifier">IC</span><span class="plain">, </span><span class="constant">CONSTRUCT_READ_MTID</span><span class="plain">, </span><span class="functiontext"><a href="#SP2">Inter::Cast::read</a></span><span class="plain">);</span>
<span class="identifier">METHOD_ADD</span><span class="plain">(</span><span class="identifier">IC</span><span class="plain">, </span><span class="constant">CONSTRUCT_VERIFY_MTID</span><span class="plain">, </span><span class="functiontext"><a href="#SP2">Inter::Cast::verify</a></span><span class="plain">);</span>
<span class="identifier">METHOD_ADD</span><span class="plain">(</span><span class="identifier">IC</span><span class="plain">, </span><span class="constant">CONSTRUCT_WRITE_MTID</span><span class="plain">, </span><span class="functiontext"><a href="#SP2">Inter::Cast::write</a></span><span class="plain">);</span>
<span class="identifier">METHOD_ADD</span><span class="plain">(</span><span class="identifier">IC</span><span class="plain">, </span><span class="constant">VERIFY_INTER_CHILDREN_MTID</span><span class="plain">, </span><span class="functiontext"><a href="#SP2">Inter::Cast::verify_children</a></span><span class="plain">);</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
<p class="inwebparagraph"><a id="SP2"></a><b>&#167;2. </b></p>
<pre class="definitions">
<span class="definitionkeyword">define</span> <span class="constant">BLOCK_CAST_IFLD</span><span class="plain"> </span><span class="constant">2</span>
<span class="definitionkeyword">define</span> <span class="constant">TO_KIND_CAST_IFLD</span><span class="plain"> </span><span class="constant">3</span>
<span class="definitionkeyword">define</span> <span class="constant">FROM_KIND_CAST_IFLD</span><span class="plain"> </span><span class="constant">4</span>
<span class="definitionkeyword">define</span> <span class="constant">EXTENT_CAST_IFR</span><span class="plain"> </span><span class="constant">5</span>
</pre>
<pre class="display">
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Inter::Cast::read<button class="popup" onclick="togglePopup('usagePopup502')">...<span class="popuptext" id="usagePopup502">Usage of <b>Inter::Cast::read</b>:<br><a href="#SP1">&#167;1</a></span></button></span><span class="plain">(</span><span class="reserved">inter_construct</span><span class="plain"> *</span><span class="identifier">IC</span><span class="plain">, </span><span class="reserved">inter_bookmark</span><span class="plain"> *</span><span class="identifier">IBM</span><span class="plain">, </span><span class="reserved">inter_line_parse</span><span class="plain"> *</span><span class="identifier">ilp</span><span class="plain">, </span><span class="reserved">inter_error_location</span><span class="plain"> *</span><span class="identifier">eloc</span><span class="plain">, </span><span class="reserved">inter_error_message</span><span class="plain"> **</span><span class="identifier">E</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext"><a href="2-ann.html#SP2">Inter::Annotations::exist</a></span><span class="plain">(&amp;(</span><span class="identifier">ilp</span><span class="plain">-&gt;</span><span class="element">set</span><span class="plain">))) { *</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="3-ie.html#SP1">Inter::Errors::plain</a></span><span class="plain">(</span><span class="identifier">I</span><span class="string">"__annotations are not allowed"</span><span class="plain">, </span><span class="identifier">eloc</span><span class="plain">); </span><span class="reserved">return</span><span class="plain">; }</span>
<span class="plain">*</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="3-dfn.html#SP4">Inter::Defn::vet_level</a></span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">, </span><span class="constant">CAST_IST</span><span class="plain">, </span><span class="identifier">ilp</span><span class="plain">-&gt;</span><span class="element">indent_level</span><span class="plain">, </span><span class="identifier">eloc</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (*</span><span class="identifier">E</span><span class="plain">) </span><span class="reserved">return</span><span class="plain">;</span>
<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">routine</span><span class="plain"> = </span><span class="functiontext"><a href="3-dfn.html#SP4">Inter::Defn::get_latest_block_package</a></span><span class="plain">();</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">routine</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) { *</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="3-ie.html#SP1">Inter::Errors::plain</a></span><span class="plain">(</span><span class="identifier">I</span><span class="string">"'val' used outside function"</span><span class="plain">, </span><span class="identifier">eloc</span><span class="plain">); </span><span class="reserved">return</span><span class="plain">; }</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">from_kind</span><span class="plain"> = </span><span class="functiontext"><a href="3-iitf.html#SP1">Inter::Textual::find_symbol</a></span><span class="plain">(</span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::tree</a></span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">), </span><span class="identifier">eloc</span><span class="plain">, </span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::scope</a></span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">), </span><span class="identifier">ilp</span><span class="plain">-&gt;</span><span class="element">mr</span><span class="plain">.</span><span class="identifier">exp</span><span class="plain">[1], </span><span class="constant">KIND_IST</span><span class="plain">, </span><span class="identifier">E</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (*</span><span class="identifier">E</span><span class="plain">) </span><span class="reserved">return</span><span class="plain">;</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">to_kind</span><span class="plain"> = </span><span class="functiontext"><a href="3-iitf.html#SP1">Inter::Textual::find_symbol</a></span><span class="plain">(</span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::tree</a></span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">), </span><span class="identifier">eloc</span><span class="plain">, </span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::scope</a></span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">), </span><span class="identifier">ilp</span><span class="plain">-&gt;</span><span class="element">mr</span><span class="plain">.</span><span class="identifier">exp</span><span class="plain">[0], </span><span class="constant">KIND_IST</span><span class="plain">, </span><span class="identifier">E</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (*</span><span class="identifier">E</span><span class="plain">) </span><span class="reserved">return</span><span class="plain">;</span>
<span class="plain">*</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="#SP2">Inter::Cast::new</a></span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">, </span><span class="identifier">from_kind</span><span class="plain">, </span><span class="identifier">to_kind</span><span class="plain">, (</span><span class="constant">inter_t</span><span class="plain">) </span><span class="identifier">ilp</span><span class="plain">-&gt;</span><span class="element">indent_level</span><span class="plain">, </span><span class="identifier">eloc</span><span class="plain">);</span>
<span class="plain">}</span>
<span class="reserved">inter_error_message</span><span class="plain"> *</span><span class="functiontext">Inter::Cast::new<button class="popup" onclick="togglePopup('usagePopup503')">...<span class="popuptext" id="usagePopup503">Usage of <b>Inter::Cast::new</b>:<br>none</span></button></span><span class="plain">(</span><span class="reserved">inter_bookmark</span><span class="plain"> *</span><span class="identifier">IBM</span><span class="plain">, </span><span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">from_kind</span><span class="plain">, </span><span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">to_kind</span><span class="plain">, </span><span class="constant">inter_t</span><span class="plain"> </span><span class="identifier">level</span><span class="plain">, </span><span class="reserved">inter_error_location</span><span class="plain"> *</span><span class="identifier">eloc</span><span class="plain">) {</span>
<span class="reserved">inter_tree_node</span><span class="plain"> *</span><span class="identifier">P</span><span class="plain"> = </span><span class="functiontext"><a href="2-in.html#SP4">Inter::Node::fill_3</a></span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">, </span><span class="constant">CAST_IST</span><span class="plain">, </span><span class="constant">0</span><span class="plain">, </span><span class="functiontext"><a href="2-st.html#SP9">Inter::SymbolsTables::id_from_IRS_and_symbol</a></span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">, </span><span class="identifier">to_kind</span><span class="plain">), </span><span class="functiontext"><a href="2-st.html#SP9">Inter::SymbolsTables::id_from_IRS_and_symbol</a></span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">, </span><span class="identifier">from_kind</span><span class="plain">), </span><span class="identifier">eloc</span><span class="plain">, (</span><span class="constant">inter_t</span><span class="plain">) </span><span class="identifier">level</span><span class="plain">);</span>
<span class="reserved">inter_error_message</span><span class="plain"> *</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="3-dfn.html#SP4">Inter::Defn::verify_construct</a></span><span class="plain">(</span><span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::package</a></span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">), </span><span class="identifier">P</span><span class="plain">); </span><span class="reserved">if</span><span class="plain"> (</span><span class="identifier">E</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">E</span><span class="plain">;</span>
<span class="functiontext"><a href="2-bkm.html#SP1">Inter::Bookmarks::insert</a></span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">, </span><span class="identifier">P</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Inter::Cast::verify<button class="popup" onclick="togglePopup('usagePopup504')">...<span class="popuptext" id="usagePopup504">Usage of <b>Inter::Cast::verify</b>:<br><a href="#SP1">&#167;1</a></span></button></span><span class="plain">(</span><span class="reserved">inter_construct</span><span class="plain"> *</span><span class="identifier">IC</span><span class="plain">, </span><span class="reserved">inter_tree_node</span><span class="plain"> *</span><span class="identifier">P</span><span class="plain">, </span><span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">owner</span><span class="plain">, </span><span class="reserved">inter_error_message</span><span class="plain"> **</span><span class="identifier">E</span><span class="plain">) {</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">P</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">extent</span><span class="plain"> != </span><span class="constant">EXTENT_CAST_IFR</span><span class="plain">) { *</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="2-in.html#SP6">Inter::Node::error</a></span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"extent wrong"</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">); </span><span class="reserved">return</span><span class="plain">; }</span>
<span class="plain">*</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="3-vi.html#SP1">Inter::Verify::symbol</a></span><span class="plain">(</span><span class="identifier">owner</span><span class="plain">, </span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">P</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[</span><span class="constant">TO_KIND_CAST_IFLD</span><span class="plain">], </span><span class="constant">KIND_IST</span><span class="plain">); </span><span class="reserved">if</span><span class="plain"> (*</span><span class="identifier">E</span><span class="plain">) </span><span class="reserved">return</span><span class="plain">;</span>
<span class="plain">*</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="3-vi.html#SP1">Inter::Verify::symbol</a></span><span class="plain">(</span><span class="identifier">owner</span><span class="plain">, </span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">P</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[</span><span class="constant">FROM_KIND_CAST_IFLD</span><span class="plain">], </span><span class="constant">KIND_IST</span><span class="plain">); </span><span class="reserved">if</span><span class="plain"> (*</span><span class="identifier">E</span><span class="plain">) </span><span class="reserved">return</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Inter::Cast::write<button class="popup" onclick="togglePopup('usagePopup505')">...<span class="popuptext" id="usagePopup505">Usage of <b>Inter::Cast::write</b>:<br><a href="#SP1">&#167;1</a></span></button></span><span class="plain">(</span><span class="reserved">inter_construct</span><span class="plain"> *</span><span class="identifier">IC</span><span class="plain">, </span><span class="identifier">OUTPUT_STREAM</span><span class="plain">, </span><span class="reserved">inter_tree_node</span><span class="plain"> *</span><span class="identifier">P</span><span class="plain">, </span><span class="reserved">inter_error_message</span><span class="plain"> **</span><span class="identifier">E</span><span class="plain">) {</span>
<span class="reserved">inter_symbols_table</span><span class="plain"> *</span><span class="identifier">locals</span><span class="plain"> = </span><span class="functiontext"><a href="2-pck.html#SP3">Inter::Packages::scope_of</a></span><span class="plain">(</span><span class="identifier">P</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">locals</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) { *</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="2-in.html#SP6">Inter::Node::error</a></span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"function has no symbols table"</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">); </span><span class="reserved">return</span><span class="plain">; }</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">from_kind</span><span class="plain"> = </span><span class="functiontext"><a href="2-st.html#SP7">Inter::SymbolsTables::symbol_from_frame_data</a></span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="constant">FROM_KIND_CAST_IFLD</span><span class="plain">);</span>
<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">to_kind</span><span class="plain"> = </span><span class="functiontext"><a href="2-st.html#SP7">Inter::SymbolsTables::symbol_from_frame_data</a></span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="constant">TO_KIND_CAST_IFLD</span><span class="plain">);</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">from_kind</span><span class="plain">) &amp;&amp; (</span><span class="identifier">to_kind</span><span class="plain">)) {</span>
<span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"cast %S &lt;- %S"</span><span class="plain">, </span><span class="identifier">to_kind</span><span class="plain">-&gt;</span><span class="element">symbol_name</span><span class="plain">, </span><span class="identifier">from_kind</span><span class="plain">-&gt;</span><span class="element">symbol_name</span><span class="plain">);</span>
<span class="plain">} </span><span class="reserved">else</span><span class="plain"> { *</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="2-in.html#SP6">Inter::Node::error</a></span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"cannot write cast"</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">); </span><span class="reserved">return</span><span class="plain">; }</span>
<span class="plain">}</span>
<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Inter::Cast::verify_children<button class="popup" onclick="togglePopup('usagePopup506')">...<span class="popuptext" id="usagePopup506">Usage of <b>Inter::Cast::verify_children</b>:<br><a href="#SP1">&#167;1</a></span></button></span><span class="plain">(</span><span class="reserved">inter_construct</span><span class="plain"> *</span><span class="identifier">IC</span><span class="plain">, </span><span class="reserved">inter_tree_node</span><span class="plain"> *</span><span class="identifier">P</span><span class="plain">, </span><span class="reserved">inter_error_message</span><span class="plain"> **</span><span class="identifier">E</span><span class="plain">) {</span>
<span class="reserved">int</span><span class="plain"> </span><span class="identifier">arity_as_invoked</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">;</span>
<span class="identifier">LOOP_THROUGH_INTER_CHILDREN</span><span class="plain">(</span><span class="identifier">C</span><span class="plain">, </span><span class="identifier">P</span><span class="plain">) {</span>
<span class="identifier">arity_as_invoked</span><span class="plain">++;</span>
<span class="reserved">if</span><span class="plain"> ((</span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="identifier">data</span><span class="plain">[0] != </span><span class="constant">INV_IST</span><span class="plain">) &amp;&amp; (</span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[0] != </span><span class="constant">VAL_IST</span><span class="plain">) &amp;&amp; (</span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[0] != </span><span class="constant">EVALUATION_IST</span><span class="plain">) &amp;&amp; (</span><span class="identifier">C</span><span class="plain">-&gt;</span><span class="element">W</span><span class="plain">.</span><span class="element">data</span><span class="plain">[0] != </span><span class="constant">CAST_IST</span><span class="plain">)) {</span>
<span class="plain">*</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="2-in.html#SP6">Inter::Node::error</a></span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"only inv, cast, concatenate and val can be under a cast"</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="plain">}</span>
<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">arity_as_invoked</span><span class="plain"> != </span><span class="constant">1</span><span class="plain">) {</span>
<span class="plain">*</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext"><a href="2-in.html#SP6">Inter::Node::error</a></span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"a cast should have exactly one child"</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">);</span>
<span class="reserved">return</span><span class="plain">;</span>
<span class="plain">}</span>
<span class="plain">}</span>
</pre>
<p class="inwebparagraph"></p>
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