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<!--Weave of '5/tlc3' generated by 7-->
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<ul class="crumbs"><li><a href="../webs.html">★</a></li><li><a href="index.html">inter</a></li><li><a href="index.html#5">Chapter 5: Code Constructs</a></li><li><b>The Lab Construct</b></li></ul><p class="purpose">Defining the Lab construct.</p>
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. </b></p>
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<pre class="definitions">
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<span class="definitionkeyword">enum</span> <span class="constant">LAB_IST</span>
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</pre>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Inter::Lab::define</span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="reserved">inter_construct</span><span class="plain"> *</span><span class="identifier">IC</span><span class="plain"> = </span><span class="functiontext">Inter::Defn::create_construct</span><span class="plain">(</span>
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<span class="constant">LAB_IST</span><span class="plain">,</span>
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<span class="identifier">L</span><span class="string">"lab (%C+)"</span><span class="plain">,</span>
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<span class="identifier">I</span><span class="string">"lab"</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"labs"</span><span class="plain">);</span>
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<span class="identifier">IC</span><span class="plain">-</span><span class="element">>min_level</span><span class="plain"> = 1;</span>
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<span class="identifier">IC</span><span class="plain">-</span><span class="element">>max_level</span><span class="plain"> = 100000000;</span>
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<span class="identifier">IC</span><span class="plain">-</span><span class="element">>usage_permissions</span><span class="plain"> = </span><span class="constant">INSIDE_CODE_PACKAGE</span><span class="plain">;</span>
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<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">Inter::Lab::read</span><span class="plain">);</span>
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<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">Inter::Lab::verify</span><span class="plain">);</span>
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<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">Inter::Lab::write</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Inter::Lab::define is used in 3/dfn (<a href="3-dfn.html#SP3">§3</a>).</p>
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<p class="inwebparagraph"><a id="SP2"></a><b>§2. </b></p>
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<pre class="definitions">
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<span class="definitionkeyword">define</span> <span class="constant">BLOCK_LAB_IFLD</span><span class="plain"> 2</span>
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<span class="definitionkeyword">define</span> <span class="constant">LABEL_LAB_IFLD</span><span class="plain"> 3</span>
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<span class="definitionkeyword">define</span> <span class="constant">EXTENT_LAB_IFR</span><span class="plain"> 4</span>
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</pre>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Inter::Lab::read</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>
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<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext">Inter::Annotations::exist</span><span class="plain">(&(</span><span class="identifier">ilp</span><span class="plain">-</span><span class="element">>set</span><span class="plain">))) { *</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext">Inter::Errors::plain</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>
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<span class="plain">*</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext">Inter::Defn::vet_level</span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">, </span><span class="constant">LAB_IST</span><span class="plain">, </span><span class="identifier">ilp</span><span class="plain">-</span><span class="element">>indent_level</span><span class="plain">, </span><span class="identifier">eloc</span><span class="plain">);</span>
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<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>
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<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">routine</span><span class="plain"> = </span><span class="functiontext">Inter::Defn::get_latest_block_package</span><span class="plain">();</span>
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<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">Inter::Errors::plain</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"'lab' 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>
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<span class="reserved">inter_symbols_table</span><span class="plain"> *</span><span class="identifier">locals</span><span class="plain"> = </span><span class="functiontext">Inter::Packages::scope</span><span class="plain">(</span><span class="identifier">routine</span><span class="plain">);</span>
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<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">Inter::Errors::plain</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">eloc</span><span class="plain">); </span><span class="reserved">return</span><span class="plain">; }</span>
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<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">label</span><span class="plain"> = </span><span class="functiontext">Inter::SymbolsTables::symbol_from_name</span><span class="plain">(</span><span class="identifier">locals</span><span class="plain">, </span><span class="identifier">ilp</span><span class="plain">-</span><span class="element">>mr</span><span class="plain">.</span><span class="identifier">exp</span><span class="plain">[0]);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext">Inter::Symbols::is_label</span><span class="plain">(</span><span class="identifier">label</span><span class="plain">) == </span><span class="identifier">FALSE</span><span class="plain">) { *</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext">Inter::Errors::plain</span><span class="plain">(</span><span class="identifier">I</span><span class="string">"not a label"</span><span class="plain">, </span><span class="identifier">eloc</span><span class="plain">); </span><span class="reserved">return</span><span class="plain">; }</span>
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<span class="plain">*</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext">Inter::Lab::new</span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">, </span><span class="identifier">label</span><span class="plain">, (</span><span class="constant">inter_t</span><span class="plain">) </span><span class="identifier">ilp</span><span class="plain">-</span><span class="element">>indent_level</span><span class="plain">, </span><span class="identifier">eloc</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="reserved">inter_error_message</span><span class="plain"> *</span><span class="functiontext">Inter::Lab::new</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">label</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>
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<span class="reserved">inter_tree_node</span><span class="plain"> *</span><span class="identifier">P</span><span class="plain"> = </span><span class="functiontext">Inter::Node::fill_2</span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">, </span><span class="constant">LAB_IST</span><span class="plain">, 0, </span><span class="functiontext">Inter::SymbolsTables::id_from_IRS_and_symbol</span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">, </span><span class="identifier">label</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>
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<span class="reserved">inter_error_message</span><span class="plain"> *</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext">Inter::Defn::verify_construct</span><span class="plain">(</span><span class="functiontext">Inter::Bookmarks::package</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>
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<span class="functiontext">Inter::Bookmarks::insert</span><span class="plain">(</span><span class="identifier">IBM</span><span class="plain">, </span><span class="identifier">P</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">NULL</span><span class="plain">;</span>
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<span class="plain">}</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Inter::Lab::verify</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>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">P</span><span class="plain">-</span><span class="element">>W.extent</span><span class="plain"> != </span><span class="constant">EXTENT_LAB_IFR</span><span class="plain">) { *</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext">Inter::Node::error</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>
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<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">label</span><span class="plain"> = </span><span class="functiontext">Inter::SymbolsTables::local_symbol_from_id</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="element">>W.data</span><span class="plain">[</span><span class="constant">LABEL_LAB_IFLD</span><span class="plain">]);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="functiontext">Inter::Symbols::is_label</span><span class="plain">(</span><span class="identifier">label</span><span class="plain">) == </span><span class="identifier">FALSE</span><span class="plain">) { *</span><span class="identifier">E</span><span class="plain"> = </span><span class="functiontext">Inter::Node::error</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"no such label"</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">); </span><span class="reserved">return</span><span class="plain">; }</span>
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<span class="plain">}</span>
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">Inter::Lab::write</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>
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<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">pack</span><span class="plain"> = </span><span class="functiontext">Inter::Packages::container</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">);</span>
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<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">label</span><span class="plain"> = </span><span class="functiontext">Inter::SymbolsTables::local_symbol_from_id</span><span class="plain">(</span><span class="identifier">pack</span><span class="plain">, </span><span class="identifier">P</span><span class="plain">-</span><span class="element">>W.data</span><span class="plain">[</span><span class="constant">LABEL_LAB_IFLD</span><span class="plain">]);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">label</span><span class="plain">) {</span>
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<span class="identifier">WRITE</span><span class="plain">(</span><span class="string">"lab %S"</span><span class="plain">, </span><span class="identifier">label</span><span class="plain">-</span><span class="element">>symbol_name</span><span class="plain">);</span>
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<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">Inter::Node::error</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">, </span><span class="identifier">I</span><span class="string">"cannot write lab"</span><span class="plain">, </span><span class="identifier">NULL</span><span class="plain">); </span><span class="reserved">return</span><span class="plain">; }</span>
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<span class="plain">}</span>
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<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="functiontext">Inter::Lab::label_symbol</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>
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<span class="reserved">inter_package</span><span class="plain"> *</span><span class="identifier">pack</span><span class="plain"> = </span><span class="functiontext">Inter::Packages::container</span><span class="plain">(</span><span class="identifier">P</span><span class="plain">);</span>
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<span class="reserved">inter_symbol</span><span class="plain"> *</span><span class="identifier">lab</span><span class="plain"> = </span><span class="functiontext">Inter::SymbolsTables::local_symbol_from_id</span><span class="plain">(</span><span class="identifier">pack</span><span class="plain">, </span><span class="identifier">P</span><span class="plain">-</span><span class="element">>W.data</span><span class="plain">[</span><span class="constant">LABEL_LAB_IFLD</span><span class="plain">]);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">lab</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="identifier">internal_error</span><span class="plain">(</span><span class="string">"bad lab"</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">lab</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="endnote">The function Inter::Lab::read is used in <a href="#SP1">§1</a>.</p>
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<p class="endnote">The function Inter::Lab::new appears nowhere else.</p>
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<p class="endnote">The function Inter::Lab::verify is used in <a href="#SP1">§1</a>.</p>
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<p class="endnote">The function Inter::Lab::write is used in <a href="#SP1">§1</a>.</p>
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<p class="endnote">The function Inter::Lab::label_symbol appears nowhere else.</p>
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