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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../intern.html" > Inter Modules< / a > < / li > < li > < a href = "index.html" > final< / a > < / li > < li > < a href = "index.html#2" > Chapter 2: Mechanism< / a > < / li > < li > < b > Vanilla Functions< / b > < / li > < / ul > < / div >
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< p class = "purpose" > How the vanilla code generation strategy declares functions.< / p >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > The following traverses the Inter tree to discover all of the functions
defined within it, and does two important things for each:
< / p >
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< ul class = "items" > < li > (a) Assigns it a < a href = "2-vf.html#SP3" class = "internal" > vanilla_function< / a > of metadata, and then
< / li > < li > (b) Calls < a href = "2-cg2.html#SP6" class = "internal" > Generators::predeclare_function< / a > to let the generator know that
the function exists. Not all target languages require functions to be predeclared,
so generators can if they choose ignore this.
< / li > < / ul >
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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" > VanillaFunctions::predeclare_functions< / 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" > VanillaFunctions::predeclare_functions< / span > < / span > :< br / > Vanilla - < a href = "2-vnl.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > code_generation< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > InterTree::traverse< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > from< / span > < span class = "plain-syntax" > , < / span > < a href = "2-vf.html#SP2" class = "function-link" > < span class = "function-syntax" > VanillaFunctions::predeclare_this< / span > < / a > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > PACKAGE_IST< / 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 = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > < / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VanillaFunctions::predeclare_this< / 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" > VanillaFunctions::predeclare_this< / span > < / span > :< br / > < a href = "2-vf.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > inter_tree< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > I< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > inter_tree_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > state< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > code_generation< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > = (< / span > < span class = "reserved-syntax" > code_generation< / 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" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > PackageInstruction::name_symbol< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PackageInstruction::at_this_head< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / 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" > PackageInstruction::is_function< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > )) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > vanilla_function< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > = < / span > < a href = "2-vf.html#SP6" class = "function-link" > < span class = "function-syntax" > VanillaFunctions::new< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP6" class = "function-link" > < span class = "function-syntax" > Generators::predeclare_function< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. < / b > Each function has metadata as follows. Note that:
< / p >
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< ul class = "items" > < li > (a) Phrase syntax will only exist for functions which originated in Inform 7
source text; so for functions coming from kits, < span class = "extract" > < span class = "extract-syntax" > phrase_syntax< / span > < / span > will be empty
and < span class = "extract" > < span class = "extract-syntax" > formal_arity< / span > < / span > will be 0.
< / li > < li > (b) For I7 functions, < span class = "extract" > < span class = "extract-syntax" > formal_arity< / span > < / span > will be the number of arguments in the
phrase preamble.
< / li > < li > (c) For all functions, < span class = "extract" > < span class = "extract-syntax" > max_arity< / span > < / span > is the total number of local variables in
the function, and that is by definition the largest number of arguments which
could possibly be passed to this function by a call. Note that it will always
be true that < span class = "extract" > < span class = "extract-syntax" > max_arity > = formal_arity< / span > < / span > .
< / li > < li > (d) Calling conventions for Inter functions are not entirely simple: see
< a href = "5-cfm.html" class = "internal" > C Function Model< / a > for discussion of how they differ from regular C functions.
In particular, any function with a local variable called < span class = "extract" > < span class = "extract-syntax" > _vararg_count< / span > < / span > is
called with a variable number of arguments, placed on the stack before the call,
rather than with arguments placed into local variables in the usual way.
< / li > < / ul >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > typedef< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > vanilla_function< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > phrase_syntax< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > linked_list< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > locals< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > of < / span > < span class = "extract" > < span class = "extract-syntax" > text_stream< / span > < / span > < span class = "comment-syntax" > , the names only< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > struct< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_tree_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > function_body< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > takes_variable_arguments< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > max_arity< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > formal_arity< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CLASS_DEFINITION< / span >
< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > vanilla_function< / span > < span class = "plain-syntax" > ;< / span >
< / pre >
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< ul class = "endnotetexts" > < li > The structure vanilla_function is accessed in 2/vi, 4/i6c2, 5/clt, 5/cfm and here.< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP4" class = "paragraph-anchor" > < / a > < b > § 4. < / b > This produces a synopsis of the phrase syntax which can be used in an identifier.
For example, for "To award (N - number) points to (P - person)", the following
writes < span class = "extract" > < span class = "extract-syntax" > award_X_points_to_X< / span > < / span > :
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VanillaFunctions::syntax_synopsis< / 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" > VanillaFunctions::syntax_synopsis< / span > < / span > :< br / > C Function Model - < a href = "5-cfm.html#SP14_3" > § 14.3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > OUTPUT_STREAM< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > vanilla_function< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > md< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > phrase_syntax< / span > < span class = "plain-syntax" > ;< / span >
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< 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" > =3, < / span > < span class = "identifier-syntax" > bracketed< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > < < / span > < span class = "identifier-syntax" > Str::len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > md< / span > < span class = "plain-syntax" > ); < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > c< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::get_at< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > md< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > bracketed< / 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" > c< / span > < span class = "plain-syntax" > == < / span > < span class = "character-syntax" > ')'< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > bracketed< / 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" > else< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > c< / span > < span class = "plain-syntax" > == < / span > < span class = "character-syntax" > '('< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PUT< / span > < span class = "plain-syntax" > (< / span > < span class = "character-syntax" > 'X'< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > bracketed< / 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" > else< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Characters::isalpha< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > c< / span > < span class = "plain-syntax" > )) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > PUT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > c< / 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" > PUT< / span > < span class = "plain-syntax" > (< / span > < span class = "character-syntax" > '_'< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP5" class = "paragraph-anchor" > < / a > < b > § 5. < / b > And on the same example, this would return 2:
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< / p >
< 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" > VanillaFunctions::formal_arity< / 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" > VanillaFunctions::formal_arity< / span > < / span > :< br / > < a href = "2-vf.html#SP6" > § 6< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > vanilla_function< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > A< / 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" > LOOP_THROUGH_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > phrase_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" > Str::get< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > ) == < / span > < span class = "character-syntax" > '('< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > A< / 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" > A< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > }< / span >
< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP6" class = "paragraph-anchor" > < / a > < b > § 6. < / b > So, then:
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > vanilla_function< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > VanillaFunctions::new< / 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" > VanillaFunctions::new< / span > < / span > :< br / > < a href = "2-vf.html#SP2" > § 2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > code_generation< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_package< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > InterPackage::container< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > definition< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_package< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > PP< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > InterPackage::parent< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > );< / span >
2022-03-01 00:24:58 +02:00
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > i7_syntax< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > PP< / span > < span class = "plain-syntax" > ?(< / span > < span class = "identifier-syntax" > Metadata::optional_textual< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PP< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "^phrase_syntax"< / span > < span class = "plain-syntax" > )):< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > vanilla_function< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > CREATE< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > vanilla_function< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > takes_variable_arguments< / 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" > vf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > identifier< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::duplicate< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > InterSymbol::trans< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > locals< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NEW_LINKED_LIST< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > phrase_syntax< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::duplicate< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > i7_syntax< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_package< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > code_block< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > PackageInstruction::which< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > function_body< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > InterPackage::head< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > code_block< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > translation_data< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > STORE_POINTER_vanilla_function< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-vf.html#SP7" class = "function-link" > < span class = "function-syntax" > VanillaFunctions::seek_locals< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > function_body< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > max_arity< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > LinkedLists::len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > locals< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > formal_arity< / span > < span class = "plain-syntax" > = < / span > < a href = "2-vf.html#SP5" class = "function-link" > < span class = "function-syntax" > VanillaFunctions::formal_arity< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > vf< / 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" > vf< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP7" class = "paragraph-anchor" > < / a > < b > § 7. < / b > This performs a local traverse of the body of the function to look for local
variable declarations.
< / p >
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< p class = "commentary" > Note that we look at < span class = "extract" > < span class = "extract-syntax" > InterSymbol::identifier(local_s)< / span > < / span > not < span class = "extract" > < span class = "extract-syntax" > InterSymbol::trans(local_s)< / span > < / span >
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when checking for < span class = "extract" > < span class = "extract-syntax" > _vararg_count< / span > < / span > because the translated name may have been mangled
in some way by the generator. (As indeed the C generator does, mangling this to
< span class = "extract" > < span class = "extract-syntax" > local__vararg_count< / span > < / span > .)
< / 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" > VanillaFunctions::seek_locals< / span > < button class = "popup" onclick = "togglePopup('usagePopup6')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup6" > Usage of < span class = "code-font" > < span class = "function-syntax" > VanillaFunctions::seek_locals< / span > < / span > :< br / > < a href = "2-vf.html#SP6" > § 6< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > code_generation< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > inter_tree_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > vanilla_function< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > ) {< / span >
2022-03-14 00:08:41 +02:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Inode::is< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > LOCAL_IST< / span > < span class = "plain-syntax" > )) {< / span >
2022-03-13 13:28:33 +02:00
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > local_s< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > LocalInstruction::variable< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > );< / span >
2022-02-04 02:55:12 +02:00
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ADD_TO_LINKED_LIST< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > InterSymbol::trans< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > local_s< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > locals< / span > < span class = "plain-syntax" > );< / span >
2022-02-14 01:44:50 +02:00
< 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" > InterSymbol::identifier< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > local_s< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "_vararg_count"< / span > < span class = "plain-syntax" > ))< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > takes_variable_arguments< / 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 >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_THROUGH_INTER_CHILDREN< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ) < / span > < a href = "2-vf.html#SP7" class = "function-link" > < span class = "function-syntax" > VanillaFunctions::seek_locals< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > F< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP8" class = "paragraph-anchor" > < / a > < b > § 8. < / b > Note that a pointer to < span class = "extract" > < span class = "extract-syntax" > vf< / span > < / span > is cached with each function name symbol for speed:
< / 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" > VanillaFunctions::declare_function< / span > < button class = "popup" onclick = "togglePopup('usagePopup7')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup7" > Usage of < span class = "code-font" > < span class = "function-syntax" > VanillaFunctions::declare_function< / span > < / span > :< br / > Vanilla - < a href = "2-vnl.html#SP2" > § 2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > code_generation< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > vanilla_function< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > RETRIEVE_POINTER_vanilla_function< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > translation_data< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP9" class = "function-link" > < span class = "function-syntax" > Generators::declare_function< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP9" class = "paragraph-anchor" > < / a > < b > § 9. < / b > < / 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" > VanillaFunctions::invoke_function< / span > < button class = "popup" onclick = "togglePopup('usagePopup8')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup8" > Usage of < span class = "code-font" > < span class = "function-syntax" > VanillaFunctions::invoke_function< / span > < / span > :< br / > Vanilla Code - < a href = "2-vc2.html#SP3_2" > § 3.2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > code_generation< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_tree_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > void_context< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_tree_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > definition< / 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" > Inode::is< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > CONSTANT_IST< / span > < span class = "plain-syntax" > )) & & < / span >
2022-03-13 23:18:06 +02:00
< span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ConstantInstruction::list_format< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > ) == < / span > < span class = "identifier-syntax" > CONST_LIST_FORMAT_NONE< / span > < span class = "plain-syntax" > )) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_pair< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ConstantInstruction::constant< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > );< / span >
2022-02-28 01:52:33 +02:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > InterValuePairs::is_symbolic< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > )) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > InterValuePairs::to_symbol_at< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > D< / span > < span class = "plain-syntax" > );< / span >
2021-11-06 16:35:25 +02:00
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > ;< / span >
2021-11-06 01:12:14 +02:00
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > vanilla_function< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > RETRIEVE_POINTER_vanilla_function< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > fn_s< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > translation_data< / 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" > vf< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "no translation data"< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP15" class = "function-link" > < span class = "function-syntax" > Generators::invoke_function< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > vf< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > void_context< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
< / pre >
< nav role = "progress" > < div class = "progresscontainer" >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "2-vc.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-wtmd.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-fm.html" > 1< / a > < / li > < li class = "progresscurrentchapter" > 2< / li > < li class = "progresssection" > < a href = "2-cg.html" > cg< / a > < / li > < li class = "progresssection" > < a href = "2-cg2.html" > cg2< / a > < / li > < li class = "progresssection" > < a href = "2-vnl.html" > vnl< / a > < / li > < li class = "progresssection" > < a href = "2-vc.html" > vc< / a > < / li > < li class = "progresscurrent" > vf< / li > < li class = "progresssection" > < a href = "2-vo.html" > vo< / a > < / li > < li class = "progresssection" > < a href = "2-vc2.html" > vc2< / a > < / li > < li class = "progresssection" > < a href = "2-vi.html" > vi< / a > < / li > < li class = "progresschapter" > < a href = "3-fti.html" > 3< / a > < / li > < li class = "progresschapter" > < a href = "4-fi6.html" > 4< / a > < / li > < li class = "progresschapter" > < a href = "5-fnc.html" > 5< / a > < / li > < li class = "progressnext" > < a href = "2-vo.html" > ❯ < / a > < / li > < / ul > < / div >
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< / nav > <!-- End of weave -->
< / main >
< / body >
< / html >