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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../inform7n.html" > Inform7< / a > < / li > < li > < a href = "index.html" > imperative< / a > < / li > < li > < a href = "index.html#4" > Chapter 4: Propositions< / a > < / li > < li > < b > Cinders and Deferrals< / b > < / li > < / ul > < / div >
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< p class = "purpose" > Cinders are constants in deferred propositions referring to values in the original stack frame.< / p >
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< ul class = "toc" > < li > < a href = "4-cad.html#SP7" > § 7. The kind of terms< / a > < / li > < / ul > < hr class = "tocbar" >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > The issues giving rise to cinders are explained in < a href = "4-dtd.html" class = "internal" > Deciding to Defer< / a > .
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When a proposition contains a constant — in the predicate calculus sense;
it may well be a variable or even a function call in Inform — and this
cannot be accessed from the stack frame of the proposition's deferral
function, the constant is a "cinder".< sup id = "fnref:1" > < a href = "#fn:1" rel = "footnote" > 1< / a > < / sup >
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< / p >
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< p class = "commentary" > Clearly genuine constants — literal numbers, names of rules, and so on — and
global variables need not be cindered: those are the same in any stack frame
and can be evaluated without side-effects. We cinder everything else, which
seems only prudent. For example:
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< / p >
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< ul class = "items" > < li > (a) phrases to decide values, cindered because they might be slow or have
side-effects to evaluate;
< / li > < li > (b) shared non-local variables, such as variables attached to actions or
activities, cindered because they are only allowed in certain routines, and
the eventual deferred proposition routine might not qualify;
< / li > < li > (c) local variables, cindered since they won't exist in the deferred routine;
< / li > < li > (d) list and table entries, cindered since they are relatively slow to look up.
< / li > < / ul >
< ul class = "footnotetexts" > < li class = "footnote" id = "fn:1" > < p class = "inwebfootnote" > < sup id = "fnref:1" > < a href = "#fn:1" rel = "footnote" > 1< / a > < / sup > Originally a contraction of "constant in deferred routine".
< a href = "#fnref:1" title = "return to text" > ↩ < / a > < / p > < / li > < / ul >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Cinders::needs_to_be_cindered< / 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" > Cinders::needs_to_be_cindered< / span > < / span > :< br / > < a href = "4-cad.html#SP3" > § 3< / a > , < a href = "4-cad.html#SP4" > § 4< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > spec< / 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" > Node::is< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > CONSTANT_NT< / span > < span class = "plain-syntax" > )) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > FALSE< / 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" > Lvalues::is_global_variable< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > )) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > At any given moment, we can only be working on the compilation of a single
deferred proposition function, so we store its identity in the following
rather than waste space giving each < span class = "extract" > < span class = "extract-syntax" > pcalc_term< / span > < / span > a pointer to it:
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > pcalc_prop_deferral< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > current_pdef< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > used only in this section< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. < / b > Within any given proposition, the cinders are numbered 0, 1, 2, ...; these
numbers are recorded in the < span class = "extract" > < span class = "extract-syntax" > cinder< / span > < / span > field of the relevant < span class = "extract" > < span class = "extract-syntax" > pcalc_term< / span > < / span > structure.
A term with < span class = "extract" > < span class = "extract-syntax" > cinder< / span > < / span > set to \(-1\) is not a cinder.
< / p >
< p class = "commentary" > Here we count the cinders in a proposition, but compile nothing and change nothing:
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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" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Cinders::count< / 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" > Cinders::count< / span > < / span > :< br / > Compile Loops - < a href = "4-cl.html#SP2" > § 2< / a > < br / > Deciding to Defer - < a href = "4-dtd.html#SP11" > § 11< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pcalc_prop< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > prop< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > pcalc_prop_deferral< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > pdef< / 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 >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TRAVERSE_VARIABLE< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > atom< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TRAVERSE_PROPOSITION< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > atom< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > prop< / 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" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "function-syntax" > < atom-> < / span > < span class = "identifier-syntax" > arity< / 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 = "identifier-syntax" > N< / span > < span class = "plain-syntax" > = < / span > < a href = "4-cad.html#SP3" class = "function-link" > < span class = "function-syntax" > Cinders::count_in_term< / span > < / a > < span class = "plain-syntax" > (& (< / span > < span class = "identifier-syntax" > atom< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > terms< / 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 >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Cinders::count_in_term< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pcalc_term< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > pt< / span > < 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 >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > function< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < a href = "4-cad.html#SP3" class = "function-link" > < span class = "function-syntax" > Cinders::count_in_term< / span > < / a > < span class = "plain-syntax" > (& (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > function< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > fn_of< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > N< / 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" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > constant< / 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 > < a href = "4-cad.html#SP1" class = "function-link" > < span class = "function-syntax" > Cinders::needs_to_be_cindered< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > constant< / span > < span class = "plain-syntax" > ))< / span >
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< 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" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
< p class = "commentary firstcommentary" > < a id = "SP4" class = "paragraph-anchor" > < / a > < b > § 4. < / b > This more ambitious function sets the < span class = "extract" > < span class = "extract-syntax" > cinder< / span > < / span > field for each term, and also
sets the kinds of the cinder values in the deferred function.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Cinders::compile_cindered_values< / 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" > Cinders::compile_cindered_values< / span > < / span > :< br / > Compile Loops - < a href = "4-cl.html#SP2" > § 2< / a > < br / > Deciding to Defer - < a href = "4-dtd.html#SP4_2" > § 4.2< / a > , < a href = "4-dtd.html#SP10" > § 10< / a > , < a href = "4-dtd.html#SP11" > § 11< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pcalc_prop< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > prop< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > pcalc_prop_deferral< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > pdef< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > pcalc_prop_deferral< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > save_current_pdef< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > current_pdef< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > current_pdef< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > pdef< / 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 >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TRAVERSE_VARIABLE< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > atom< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TRAVERSE_PROPOSITION< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > atom< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > prop< / 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" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "function-syntax" > < atom-> < / span > < span class = "identifier-syntax" > arity< / 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 = "identifier-syntax" > N< / span > < span class = "plain-syntax" > = < / span > < a href = "4-cad.html#SP4" class = "function-link" > < span class = "function-syntax" > Cinders::compile_cindered_value_in_term< / span > < / a > < span class = "plain-syntax" > (& (< / span > < span class = "identifier-syntax" > atom< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > terms< / 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 >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > current_pdef< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > save_current_pdef< / 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" > N< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Cinders::compile_cindered_value_in_term< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pcalc_term< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > pt< / span > < 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 >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > function< / 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 > < a href = "4-cad.html#SP4" class = "function-link" > < span class = "function-syntax" > Cinders::compile_cindered_value_in_term< / span > < / a > < span class = "plain-syntax" > (& (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > function< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > fn_of< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > N< / 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" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > constant< / 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 > < a href = "4-cad.html#SP1" class = "function-link" > < span class = "function-syntax" > Cinders::needs_to_be_cindered< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > constant< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > cinder< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > ++;< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-cv.html#SP5" class = "function-link" > < span class = "function-syntax" > CompileValues::to_code_val< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > constant< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > current_pdef< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > cinder_kinds< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > cinder< / span > < span class = "plain-syntax" > ] = < / span > < span class = "identifier-syntax" > Specifications::to_kind< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > constant< / 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" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > cinder< / span > < span class = "plain-syntax" > = -1;< / span >
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< span class = "plain-syntax" > }< / 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" > N< / 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 > Symmetrically, when we come to compiled our deferred proposition function,
we need to declare local variables to hold these cinders.
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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" > Cinders::declare< / 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" > Cinders::declare< / span > < / span > :< br / > Compile Deferred Propositions - < a href = "4-cdp.html#SP3_5" > § 3.5< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pcalc_prop< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > prop< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > pcalc_prop_deferral< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > pdef< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > pcalc_prop_deferral< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > save_current_pdef< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > current_pdef< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > current_pdef< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > pdef< / 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 >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TRAVERSE_VARIABLE< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > atom< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TRAVERSE_PROPOSITION< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > atom< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > prop< / 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" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "function-syntax" > < atom-> < / span > < span class = "identifier-syntax" > arity< / 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 = "identifier-syntax" > N< / span > < span class = "plain-syntax" > = < / span > < a href = "4-cad.html#SP5" class = "function-link" > < span class = "function-syntax" > Cinders::cind_declare_in_term< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > , & (< / span > < span class = "identifier-syntax" > atom< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > terms< / 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 = "identifier-syntax" > current_pdef< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > save_current_pdef< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Cinders::cind_declare_in_term< / span > < 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 = "identifier-syntax" > pcalc_term< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > pt< / 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" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > function< / 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 > < a href = "4-cad.html#SP5" class = "function-link" > < span class = "function-syntax" > Cinders::cind_declare_in_term< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > , & (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > function< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > fn_of< / 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" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > constant< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > cinder< / 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 = "identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > cinder_name< / 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" > cinder_name< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "const_%d"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > ++);< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-lv.html#SP4" class = "function-link" > < span class = "function-syntax" > LocalVariables::new_other_as_symbol< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > cinder_name< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > cinder_name< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > N< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP6" class = "paragraph-anchor" > < / a > < b > § 6. < / b > Given, say, < span class = "extract" > < span class = "extract-syntax" > v == 2< / span > < / span > , we return the local variable < span class = "extract" > < span class = "extract-syntax" > const_2< / span > < / span > holding cindered
value 2. Speed is not critical here.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > local_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Cinders::find_cinder_var< / 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" > Cinders::find_cinder_var< / span > < / span > :< br / > Compile Schemas - < a href = "4-cs.html#SP5_2" > § 5.2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > v< / 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" > T< / 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" > T< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "const_%d"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > v< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > local_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > found< / span > < span class = "plain-syntax" > = < / span > < a href = "3-lv.html#SP13" class = "function-link" > < span class = "function-syntax" > LocalVariables::by_identifier< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > found< / 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 = "SP7" class = "paragraph-anchor" > < / a > < b > § 7. The kind of terms. < / b > We are now finally able to say what the kind of value of a term to be
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compiled is. The only troublesome case is when the term is a cinder; its
kind is then part of the information recorded at deferral time.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > Cinders::kind_of_term< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pcalc_term< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / 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" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > variable< / 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" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > term_checked_as_kind< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > term_checked_as_kind< / 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" > K_object< / 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" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > constant< / 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" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > cinder< / span > < span class = "plain-syntax" > > = < / span > < span class = "constant-syntax" > 0< / 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" > current_pdef< / 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" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "cindered term outside of deferral"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > current_pdef< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > cinder_kinds< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > cinder< / span > < span class = "plain-syntax" > ];< / 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" > Specifications::is_phrasal< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > constant< / span > < span class = "plain-syntax" > ))< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Dash::check_value< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > constant< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Specifications::to_kind< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > constant< / span > < span class = "plain-syntax" > );< / span >
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< 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" > pt< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > function< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > K_object< / 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" > NULL< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > never reached, though compilers cannot prove that< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
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< nav role = "progress" > < div class = "progresscontainer" >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "4-dtd.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-wtmd.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-im.html" > 1< / a > < / li > < li class = "progresschapter" > < a href = "2-cv.html" > 2< / a > < / li > < li class = "progresschapter" > < a href = "3-sf.html" > 3< / a > < / li > < li class = "progresscurrentchapter" > 4< / li > < li class = "progresssection" > < a href = "4-cs.html" > cs< / a > < / li > < li class = "progresssection" > < a href = "4-ca.html" > ca< / a > < / li > < li class = "progresssection" > < a href = "4-cp.html" > cp< / a > < / li > < li class = "progresssection" > < a href = "4-cl.html" > cl< / a > < / li > < li class = "progresssection" > < a href = "4-dtd.html" > dtd< / a > < / li > < li class = "progresscurrent" > cad< / li > < li class = "progresssection" > < a href = "4-cdp.html" > cdp< / a > < / li > < li class = "progresschapter" > < a href = "5-cbal.html" > 5< / a > < / li > < li class = "progressnext" > < a href = "4-cdp.html" > ❯ < / a > < / li > < / ul > < / div >
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< / nav > <!-- End of weave -->
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< / main >
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< / body >
< / html >