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<!--Weave of 'Inter Errors' generated by Inweb-->
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<div class="breadcrumbs">
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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#3">Chapter 3: Their Instructions</a></li><li><b>Inter Errors</b></li></ul></div>
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<p class="purpose">To issue error messages arising from loading incorrect Inter code from files.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>We use the following relatively lightweight structure to represent a position
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where an error has occurred, in reading in Inter either from a text or binary file:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">inter_error_location</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_file_position</span><span class="plain-syntax"> *</span><span class="identifier-syntax">error_tfp</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">error_line</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">error_interb</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">size_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">error_offset</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">inter_error_location</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure inter_error_location is accessed in 2/it, 3/iibf and here.</li></ul>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>These two possibilities have two creators. Note that neither of these requires
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any memory to be allocated, so they return quickly and cannot cause memory leaks.
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So it's no problem to manufacture an <a href="3-ie.html#SP1" class="internal">inter_error_location</a> for each location
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in the tree we look at.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">inter_error_location</span><span class="plain-syntax"> </span><span class="function-syntax">InterErrors::file_location</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">InterErrors::file_location</span></span>:<br/>Inter Trees - <a href="2-it.html#SP14">§14</a><br/>Inter Nodes - <a href="2-in.html#SP15">§15</a><br/>Inter in Text Files - <a href="3-iitf.html#SP2">§2</a>, <a href="3-iitf.html#SP7">§7</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">line</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_file_position</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tfp</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inter_error_location</span><span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_tfp</span><span class="plain-syntax"> = </span><span class="identifier-syntax">tfp</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_line</span><span class="plain-syntax"> = </span><span class="identifier-syntax">line</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_interb</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_offset</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">inter_error_location</span><span class="plain-syntax"> </span><span class="function-syntax">InterErrors::interb_location</span><button class="popup" onclick="togglePopup('usagePopup2')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup2">Usage of <span class="code-font"><span class="function-syntax">InterErrors::interb_location</span></span>:<br/>Inter Trees - <a href="2-it.html#SP14">§14</a><br/>Inter in Binary Files - <a href="3-iibf.html#SP9">§9</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">, </span><span class="identifier-syntax">size_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">at</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inter_error_location</span><span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_tfp</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_line</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_interb</span><span class="plain-syntax"> = </span><span class="identifier-syntax">F</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_offset</span><span class="plain-syntax"> = </span><span class="identifier-syntax">at</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>Every actual error message is defined by an instance of the following, which
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includes its location. (The point of making these is that errors might be passed
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higher up the call stack before being issued, and can be issued in a variety
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of ways.)
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">typedef</span><span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="reserved-syntax">inter_error_location</span><span class="plain-syntax"> </span><span class="identifier-syntax">error_at</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">error_body</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">struct</span><span class="plain-syntax"> </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">error_quote</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">CLASS_DEFINITION</span>
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<span class="plain-syntax">} </span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>The structure inter_error_message is accessed in 2/in and here.</li></ul>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>There are just two sorts of message: those quoting some text, and those not.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> *</span><span class="function-syntax">InterErrors::quoted</span><button class="popup" onclick="togglePopup('usagePopup3')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup3">Usage of <span class="code-font"><span class="function-syntax">InterErrors::quoted</span></span>:<br/>Annotations - <a href="2-ann.html#SP15">§15</a><br/>Inter Constructs - <a href="3-ic.html#SP7">§7</a><br/>Inter in Text Files - <a href="3-iitf.html#SP4">§4</a>, <a href="3-iitf.html#SP5">§5</a>, <a href="3-iitf.html#SP5_1">§5.1</a>, <a href="3-iitf.html#SP5_2">§5.2</a>, <a href="3-iitf.html#SP6">§6</a>, <a href="3-iitf.html#SP7_1">§7.1</a>, <a href="3-iitf.html#SP11">§11</a>, <a href="3-iitf.html#SP12">§12</a>, <a href="3-iitf.html#SP12_2">§12.2</a>, <a href="3-iitf.html#SP12_14">§12.14</a>, <a href="3-iitf.html#SP12_14_1">§12.14.1</a><br/>Inter Data Types - <a href="3-idt.html#SP17">§17</a>, <a href="3-idt.html#SP17_8">§17.8</a>, <a href="3-idt.html#SP18">§18</a><br/>The Pragma Construct - <a href="4-tpc.html#SP2">§2</a><br/>The Typename Construct - <a href="4-ttc.html#SP2">§2</a><br/>The Constant Construct - <a href="4-tcc2.html#SP2">§2</a><br/>The Instance Construct - <a href="4-tic.html#SP2">§2</a><br/>The PropertyValue Construct - <a href="4-tpc5.html#SP2">§2</a><br/>The Permission Construct - <a href="4-tpc6.html#SP2">§2</a><br/>The Primitive Construct - <a href="4-tpc7.html#SP2">§2</a><br/>The Inv Construct - <a href="5-tic.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">err</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">quote</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_error_location</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eloc</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iem</span><span class="plain-syntax"> = </span><a href="3-ie.html#SP4" class="function-link"><span class="function-syntax">InterErrors::plain</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">err</span><span class="plain-syntax">, </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">iem</span><span class="plain-syntax">-></span><span class="element-syntax">error_quote</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">quote</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">iem</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> *</span><span class="function-syntax">InterErrors::plain</span><button class="popup" onclick="togglePopup('usagePopup4')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup4">Usage of <span class="code-font"><span class="function-syntax">InterErrors::plain</span></span>:<br/>Inter Constructs - <a href="3-ic.html#SP5">§5</a>, <a href="3-ic.html#SP6">§6</a>, <a href="3-ic.html#SP7">§7</a>, <a href="3-ic.html#SP17">§17</a><br/>Inter in Binary Files - <a href="3-iibf.html#SP10">§10</a><br/>Inter in Text Files - <a href="3-iitf.html#SP3_1">§3.1</a>, <a href="3-iitf.html#SP11">§11</a><br/>Inter Data Types - <a href="3-idt.html#SP22_5">§22.5</a><br/>The Comment Construct - <a href="4-tcc.html#SP1">§1</a><br/>The Pragma Construct - <a href="4-tpc.html#SP2">§2</a><br/>The Link Construct - <a href="4-tlc.html#SP2">§2</a><br/>The Append Construct - <a href="4-tac.html#SP2">§2</a><br/>The PackageType Construct - <a href="4-tpc2.html#SP2">§2</a><br/>The Instance Construct - <a href="4-tic.html#SP2">§2</a><br/>The PropertyValue Construct - <a href="4-tpc5.html#SP2">§2</a><br/>The Permission Construct - <a href="4-tpc6.html#SP2">§2</a><br/>The Primitive Construct - <a href="4-tpc7.html#SP2">§2</a><br/>The Label Construct - <a href="5-tlc.html#SP2">§2</a><br/>The Local Construct - <a href="5-tlc2.html#SP2">§2</a><br/>The Inv Construct - <a href="5-tic.html#SP2">§2</a><br/>The Ref Construct - <a href="5-trc.html#SP2">§2</a><br/>The Val Construct - <a href="5-tvc.html#SP2">§2</a><br/>The Lab Construct - <a href="5-tlc3.html#SP2">§2</a><br/>The Lab Construct - <a href="5-tac.html#SP2">§2</a><br/>The Code Construct - <a href="5-tcc.html#SP2">§2</a><br/>The Evaluation Construct - <a href="5-tec.html#SP2">§2</a><br/>The Reference Construct - <a href="5-trc2.html#SP2">§2</a><br/>The Cast Construct - <a href="5-tcc2.html#SP2">§2</a><br/>The Splat Construct - <a href="5-tsc.html#SP2">§2</a><br/>The Plug Construct - <a href="6-tpc.html#SP1">§1</a><br/>The Socket Construct - <a href="6-tsc.html#SP1">§1</a><br/>The Version Construct - <a href="6-tvc.html#SP2">§2</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">err</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_error_location</span><span class="plain-syntax"> *</span><span class="identifier-syntax">eloc</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iem</span><span class="plain-syntax"> = </span><span class="identifier-syntax">CREATE</span><span class="plain-syntax">(</span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">iem</span><span class="plain-syntax">-></span><span class="element-syntax">error_body</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">err</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">iem</span><span class="plain-syntax">-></span><span class="element-syntax">error_quote</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">eloc</span><span class="plain-syntax">) </span><span class="identifier-syntax">iem</span><span class="plain-syntax">-></span><span class="element-syntax">error_at</span><span class="plain-syntax"> = *</span><span class="identifier-syntax">eloc</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">iem</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>The textual form of an error can be output to <span class="extract"><span class="extract-syntax">STDERR</span></span> and also the Inform 7
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debugging log at the same time, if there is one:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterErrors::issue</span><button class="popup" onclick="togglePopup('usagePopup5')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup5">Usage of <span class="code-font"><span class="function-syntax">InterErrors::issue</span></span>:<br/>Transmigration - <a href="2-trn.html#SP4_1_1">§4.1.1</a>, <a href="2-trn.html#SP4_2_1_1">§4.2.1.1</a><br/>Inter Constructs - <a href="3-ic.html#SP7">§7</a><br/>Inter in Binary Files - <a href="3-iibf.html#SP9_1_5_4">§9.1.5.4</a>, <a href="3-iibf.html#SP10">§10</a><br/>Inter in Text Files - <a href="3-iitf.html#SP2">§2</a>, <a href="3-iitf.html#SP7_1">§7.1</a>, <a href="3-iitf.html#SP9">§9</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iem</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">iem</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="identifier-syntax">internal_error</span><span class="plain-syntax">(</span><span class="string-syntax">"no error to issue"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="3-ie.html#SP5" class="function-link"><span class="function-syntax">InterErrors::issue_to</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">STDERR</span><span class="plain-syntax">, </span><span class="identifier-syntax">iem</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">ifdef</span><span class="plain-syntax"> </span><span class="identifier-syntax">CORE_MODULE</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Inter error:\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="3-ie.html#SP5" class="function-link"><span class="function-syntax">InterErrors::issue_to</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">DL</span><span class="plain-syntax">, </span><span class="identifier-syntax">iem</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> #</span><span class="identifier-syntax">endif</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterErrors::issue_to</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_error_message</span><span class="plain-syntax"> *</span><span class="identifier-syntax">iem</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">E</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">E</span><span class="plain-syntax">, </span><span class="string-syntax">"%S"</span><span class="plain-syntax">, </span><span class="identifier-syntax">iem</span><span class="plain-syntax">-></span><span class="element-syntax">error_body</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">iem</span><span class="plain-syntax">-></span><span class="element-syntax">error_quote</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">E</span><span class="plain-syntax">, </span><span class="string-syntax">": '%S'"</span><span class="plain-syntax">, </span><span class="identifier-syntax">iem</span><span class="plain-syntax">-></span><span class="element-syntax">error_quote</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inter_error_location</span><span class="plain-syntax"> </span><span class="identifier-syntax">eloc</span><span class="plain-syntax"> = </span><span class="identifier-syntax">iem</span><span class="plain-syntax">-></span><span class="element-syntax">error_at</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_interb</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%f, position %08x: "</span><span class="plain-syntax">, </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_interb</span><span class="plain-syntax">, </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_offset</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_tfp</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Errors::in_text_file_S</span><span class="plain-syntax">(</span><span class="identifier-syntax">E</span><span class="plain-syntax">, </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_tfp</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">else</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">Errors::in_text_file_S</span><span class="plain-syntax">(</span><span class="identifier-syntax">E</span><span class="plain-syntax">, </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_line</span><span class="plain-syntax">)</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">">--> %S\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">eloc</span><span class="plain-syntax">.</span><span class="element-syntax">error_line</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">E</span><span class="plain-syntax">)</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
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|
<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>This shows a debugger-like backtrace: this isn't done for every Inter error,
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|
but only in cases where at least a superficially plausible Inter program does
|
|
exist. See <a href="3-ic.html#SP7" class="internal">InterConstruct::tree_lint</a>.
|
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</p>
|
|
|
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">InterErrors::backtrace</span><button class="popup" onclick="togglePopup('usagePopup6')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup6">Usage of <span class="code-font"><span class="function-syntax">InterErrors::backtrace</span></span>:<br/>Inter Constructs - <a href="3-ic.html#SP7">§7</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">X</span><span class="plain-syntax"> = </span><span class="identifier-syntax">F</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">n</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">) {</span>
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|
<span class="plain-syntax"> </span><span class="identifier-syntax">X</span><span class="plain-syntax"> = </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::parent</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">X</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">X</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">n</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">for</span><span class="plain-syntax"> (</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">i</span><span class="plain-syntax"> = </span><span class="identifier-syntax">n</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax"> >= </span><span class="constant-syntax">0</span><span class="plain-syntax">; </span><span class="identifier-syntax">i</span><span class="plain-syntax">--) {</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">X</span><span class="plain-syntax"> = </span><span class="identifier-syntax">F</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">m</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">while</span><span class="plain-syntax"> (</span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">inter_tree_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">Y</span><span class="plain-syntax"> = </span><a href="2-it.html#SP4" class="function-link"><span class="function-syntax">InterTree::parent</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">X</span><span class="plain-syntax">);</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Y</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
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|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">m</span><span class="plain-syntax"> == </span><span class="identifier-syntax">i</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> == </span><span class="constant-syntax">0</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%2d. ** "</span><span class="plain-syntax">, </span><span class="identifier-syntax">n</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%2d. "</span><span class="plain-syntax">, (</span><span class="identifier-syntax">n</span><span class="plain-syntax">-</span><span class="identifier-syntax">i</span><span class="plain-syntax">));</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><a href="3-ic.html#SP15" class="function-link"><span class="function-syntax">InterConstruct::write_construct_text_allowing_nop</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">X</span><span class="plain-syntax">);</span>
|
|
<span class="plain-syntax"> </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">X</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Y</span><span class="plain-syntax">;</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">m</span><span class="plain-syntax">++;</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">LOOP_THROUGH_INTER_CHILDREN</span><span class="plain-syntax">(</span><span class="identifier-syntax">C</span><span class="plain-syntax">, </span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
|
|
<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE</span><span class="plain-syntax">(</span><span class="string-syntax">"%2d. "</span><span class="plain-syntax">, (</span><span class="identifier-syntax">n</span><span class="plain-syntax">+1));</span>
|
|
<span class="plain-syntax"> </span><a href="3-ic.html#SP15" class="function-link"><span class="function-syntax">InterConstruct::write_construct_text_allowing_nop</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">C</span><span class="plain-syntax">);</span>
|
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<span class="plain-syntax"> }</span>
|
|
<span class="plain-syntax">}</span>
|
|
</pre>
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