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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 = "../services.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
the exit code depends on whether the parent tool, perversely perhaps, actually
wants to have issued a given problem — this is used when testing Inform.
< / p >
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< p class = "commentary" > By convention our exit codes are 0 for success, 1 for failure, and 2 for a
filing-system-related failure.
< / 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 >
< 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 >
< 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 >
< 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 >
< span class = "plain-syntax" > }< / span >
< / 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.
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
else would detect that such an expression had no side effects and was not used.
What we now do is to dereference a null pointer, while apparently trying to make
use of the result.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< 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 >
< 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 >
< 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 >
< 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 = "plain-syntax" > < / span > < span class = "string-syntax" > "*** Intentionally crashing to force stack backtrace to console logs ***\n"< / span > < span class = "plain-syntax" > );< / span >
< 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 >
< 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 >
< 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 >
< span class = "plain-syntax" > }< / span >
< / 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 >
< 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 >
< 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.
< / 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.
< / 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
double quotes followed by the source section and line number at which it is
generated.
< / p >
< 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 >
< / 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 >
appears as a pseudo-argument in the function prototypes of the many of the
functions in this module as a result.
< / p >
< 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
another problem function, using < span class = "extract" > < span class = "extract-syntax" > PASS_SIGIL< / span > < / span > as the pseudo-argument.
< / 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 >
< 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 >
< / 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
to documentation; < span class = "extract" > < span class = "extract-syntax" > sigil_of_latest_unlinked_problem< / span > < / span > is then emptied when this
is done, whereas < span class = "extract" > < span class = "extract-syntax" > sigil_of_latest_problem< / span > < / span > keeps its value until the next
problem is issued.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< 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 >
< 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 >
< / 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 >
< pre class = "definitions code-font" > < span class = "definition-keyword" > define< / span > < span class = "constant-syntax" > ACT_ON_SIGIL< / span >
< 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 >
< 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 >
< 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 >
< 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 >
< 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" > sigil_of_latest_unlinked_problem< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > )< / 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" > Str::new< / span > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span >
< 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 >
< 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 >
< 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 >
< 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 >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span >
< 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 >
< 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 >
< 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 >
< 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 >
< 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 >
< 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 >
< / pre >
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< nav role = "progress" > < div class = "progresscontainer" >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "1-tlm.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-wtmd.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-pm.html" > 1< / a > < / li > < li class = "progresscurrentchapter" > 2< / li > < li class = "progresscurrent" > pl0< / li > < li class = "progresssection" > < a href = "2-pl1.html" > pl1< / a > < / li > < li class = "progresssection" > < a href = "2-pl2.html" > pl2< / a > < / li > < li class = "progresssection" > < a href = "2-pl3.html" > pl3< / a > < / li > < li class = "progressnext" > < a href = "2-pl1.html" > ❯ < / a > < / li > < / ul > < / div >
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< / nav > <!-- End of weave -->
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< / main >
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< / body >
< / html >
