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<!--Weave of 'Problems, Level 0' generated by Inweb-->
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Services</a></li><li><a href="index.html">problems</a></li><li><a href="index.html#2">Chapter 2: Problems</a></li><li><b>Problems, Level 0</b></li></ul></div>
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<p class="purpose">To handle fatal errors and establish how problem sigils work.</p>
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<ul class="toc"><li><a href="2-pl0.html#SP1">§1. Sudden exits</a></li><li><a href="2-pl0.html#SP3">§3. Configuration</a></li><li><a href="2-pl0.html#SP6">§6. Sigils</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Sudden exits. </b>In my beginning is my end: this lowest level of the error-handling system
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deals with systemic collapses, and it begins with the exit itself. Note that
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the exit code depends on whether the parent tool, perversely perhaps, actually
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wants to have issued a given problem — this is used when testing Inform.
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</p>
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<p class="commentary">By convention our exit codes are 0 for success, 1 for failure, and 2 for a
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filing-system-related failure.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sigil_of_required_problem</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">sigil_of_required_problem_found</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">echo_problem_message_sigils</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">crash_on_all_problems</span><span class="plain-syntax"> = </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">ProblemSigils::exit</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">ProblemSigils::exit</span></span>:<br/><a href="2-pl0.html#SP2">§2</a><br/>Problems, Level 2 - <a href="2-pl2.html#SP14">§14</a><br/>Problems, Level 3 - <a href="2-pl3.html#SP3">§3</a>, <a href="2-pl3.html#SP11">§11</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">code</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">sigil_of_required_problem</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">sigil_of_required_problem_found</span><span class="plain-syntax"> == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">exit</span><span class="plain-syntax">(0); </span><span class="comment-syntax"> so that the problem test case will fail in </span><span class="extract"><span class="extract-syntax">intest</span></span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">exit</span><span class="plain-syntax">(</span><span class="identifier-syntax">code</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="SP2" class="paragraph-anchor"></a><b>§2. </b>The following function has had an amusing evolution over the years. It does
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something nobody is ever supposed to do: deliberately crashes the process.
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At one time it executed <span class="extract"><span class="extract-syntax">int x = 1/0;</span></span>, but compilers got wise to that, or
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else would detect that such an expression had no side effects and was not used.
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What we now do is to dereference a null pointer, while apparently trying to make
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use of the result.
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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">ProblemSigils::force_crash</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">ProblemSigils::force_crash</span></span>:<br/>Problems, Level 2 - <a href="2-pl2.html#SP9">§9</a>, <a href="2-pl2.html#SP14">§14</a><br/>Problems, Level 3 - <a href="2-pl3.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">STREAM_FLUSH</span><span class="plain-syntax">(</span><span class="identifier-syntax">STDOUT</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">STREAM_FLUSH</span><span class="plain-syntax">(</span><span class="identifier-syntax">DL</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">STDERR</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"*** Intentionally crashing to force stack backtrace to console logs ***\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">STREAM_FLUSH</span><span class="plain-syntax">(</span><span class="identifier-syntax">STDERR</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">PN</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">; </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"$T"</span><span class="plain-syntax">, </span><span class="identifier-syntax">PN</span><span class="plain-syntax">-></span><span class="identifier-syntax">next</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="2-pl0.html#SP1" class="function-link"><span class="function-syntax">ProblemSigils::exit</span></a><span class="plain-syntax">(1); </span><span class="comment-syntax"> should never in fact be reached</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. Configuration. </b>Inform calls this in response to its <span class="extract"><span class="extract-syntax">-require-problem</span></span> command line switch:
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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">ProblemSigils::require</span><span class="plain-syntax">(</span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sigil</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">sigil_of_required_problem</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::duplicate</span><span class="plain-syntax">(</span><span class="identifier-syntax">sigil</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="SP4" class="paragraph-anchor"></a><b>§4. </b>And this in response to <span class="extract"><span class="extract-syntax">-sigils</span></span>, which causes the sigil of any problem to
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be echoed to standard output (i.e., printed). Again, this is useful in testing.
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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">ProblemSigils::echo_sigils</span><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">state</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">echo_problem_message_sigils</span><span class="plain-syntax"> = </span><span class="identifier-syntax">state</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>And this in response to <span class="extract"><span class="extract-syntax">-crash-all</span></span>, an ugly expedient for working with
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Inform in the debugger.
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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">ProblemSigils::crash_on_problems</span><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">state</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">crash_on_all_problems</span><span class="plain-syntax"> = </span><span class="identifier-syntax">state</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="SP6" class="paragraph-anchor"></a><b>§6. Sigils. </b>Every problem message in Inform is identified by a sigil, a short alphanumeric
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symbol. The <span class="extract"><span class="extract-syntax">_p_</span></span> notation is used to write these; this expands to the name in
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double quotes followed by the source section and line number at which it is
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generated.
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">sigil</span><span class="plain-syntax">) #</span><span class="identifier-syntax">sigil</span><span class="plain-syntax">, </span><span class="identifier-syntax">__FILE__</span><span class="plain-syntax">, </span><span class="identifier-syntax">__LINE__</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP7" class="paragraph-anchor"></a><b>§7. </b>That means that when a <span class="extract"><span class="extract-syntax">_p_</span></span> argument is given to a function, it is actually
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a list of three arguments, matching the <span class="extract"><span class="extract-syntax">SIGIL_ARGUMENTS</span></span> prototype. <span class="extract"><span class="extract-syntax">SIGIL_ARGUMENTS</span></span>
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appears as a pseudo-argument in the function prototypes of the many of the
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functions in this module as a result.
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</p>
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<p class="commentary">Each such function should either <span class="extract"><span class="extract-syntax">ACT_ON_SIGIL</span></span> itself or else pass over to
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another problem function, using <span class="extract"><span class="extract-syntax">PASS_SIGIL</span></span> as the pseudo-argument.
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">SIGIL_ARGUMENTS</span><span class="plain-syntax"> </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sigil</span><span class="plain-syntax">, </span><span class="reserved-syntax">char</span><span class="plain-syntax"> *</span><span class="identifier-syntax">file</span><span class="plain-syntax">, </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">line</span>
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<span class="definition-keyword">define</span> <span class="constant-syntax">PASS_SIGIL</span><span class="plain-syntax"> </span><span class="identifier-syntax">sigil</span><span class="plain-syntax">, </span><span class="identifier-syntax">file</span><span class="plain-syntax">, </span><span class="identifier-syntax">line</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP8" class="paragraph-anchor"></a><b>§8. </b>We will maintain the following variables. The distinction is that the
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"unlinked" one holds the sigil of a message which is next up to be hyperlinked
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to documentation; <span class="extract"><span class="extract-syntax">sigil_of_latest_unlinked_problem</span></span> is then emptied when this
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is done, whereas <span class="extract"><span class="extract-syntax">sigil_of_latest_problem</span></span> keeps its value until the next
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problem is issued.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sigil_of_latest_problem</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">sigil_of_latest_unlinked_problem</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP9" class="paragraph-anchor"></a><b>§9. </b>So, then, the following long macro is how a function "acts" on a sigil:
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</p>
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<pre class="definitions code-font"><span class="definition-keyword">define</span> <span class="constant-syntax">ACT_ON_SIGIL</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">"Problem %s issued from %s, line %d\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">sigil</span><span class="plain-syntax">, </span><span class="identifier-syntax">file</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">telemetry_recording</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="1-tlm.html#SP2" class="function-link"><span class="function-syntax">Telemetry::ensure_telemetry_file</span></a><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">telmy</span><span class="plain-syntax">, </span><span class="string-syntax">"Problem %s issued from %s, line %d\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">sigil</span><span class="plain-syntax">, </span><span class="identifier-syntax">file</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>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">sigil_of_latest_unlinked_problem</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">sigil_of_latest_unlinked_problem</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::new</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">Str::clear</span><span class="plain-syntax">(</span><span class="identifier-syntax">sigil_of_latest_unlinked_problem</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">sigil_of_latest_unlinked_problem</span><span class="plain-syntax">, </span><span class="string-syntax">"%s"</span><span class="plain-syntax">, </span><span class="identifier-syntax">sigil</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">sigil_of_latest_problem</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">sigil_of_latest_problem</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Str::new</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">Str::clear</span><span class="plain-syntax">(</span><span class="identifier-syntax">sigil_of_latest_problem</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">sigil_of_latest_problem</span><span class="plain-syntax">, </span><span class="string-syntax">"%s"</span><span class="plain-syntax">, </span><span class="identifier-syntax">sigil</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">Str::eq</span><span class="plain-syntax">(</span><span class="identifier-syntax">sigil_of_required_problem</span><span class="plain-syntax">, </span><span class="identifier-syntax">sigil_of_latest_problem</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">sigil_of_required_problem_found</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="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">echo_problem_message_sigils</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">STDERR</span><span class="plain-syntax">, </span><span class="string-syntax">"Problem__ %S\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">sigil_of_latest_problem</span><span class="plain-syntax">);</span>
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</pre>
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