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<!-- Weave of 'Vanilla Constants' generated by Inweb -->
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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 Constants< / b > < / li > < / ul > < / div >
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< p class = "purpose" > How the vanilla code generation strategy handles constants, including literal texts, lists, and arrays.< / p >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > During the main < a href = "2-vnl.html" class = "internal" > Vanilla< / a > traverse, this is called on each constant definition
in the tree:
< / 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" > VanillaConstants::constant< / 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" > VanillaConstants::constant< / span > < / span > :< br / > Vanilla - < a href = "2-vnl.html#SP3" > § 3< / 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 >
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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" > con_name< / span > < span class = "plain-syntax" > =< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > InterSymbolsTable::symbol_from_ID_at_node< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > DEFN_CONST_IFLD< / 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" > con_name< / 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 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" > InterSymbol::is_metadata_key< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > con_name< / 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" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > InterSymbol::identifier< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > con_name< / 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" > SymbolAnnotation::get_b< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > con_name< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > FAKE_ACTION_IANN< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-vc.html#SP1_2" class = "named-paragraph-link" > < span class = "named-paragraph" > Declare this constant as a fake action name< / span > < span class = "named-paragraph-number" > 1.2< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< 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" > Str::prefix_eq< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "##"< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 2< / span > < span class = "plain-syntax" > )) {< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-vc.html#SP1_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Declare this constant as an action name< / span > < span class = "named-paragraph-number" > 1.1< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< 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" > LargeScale::is_veneer_symbol< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > con_name< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-vc.html#SP1_3" class = "named-paragraph-link" > < span class = "named-paragraph" > Ignore this constant as part of the veneer< / span > < span class = "named-paragraph-number" > 1.3< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< 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" > SymbolAnnotation::get_b< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > con_name< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > OBJECT_IANN< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-vc.html#SP1_4" class = "named-paragraph-link" > < span class = "named-paragraph" > Declare this constant as a pseudo-object< / span > < span class = "named-paragraph-number" > 1.4< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< 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" > Str::eq< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > InterSymbol::identifier< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > con_name< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "UUID_ARRAY"< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-vc.html#SP1_5" class = "named-paragraph-link" > < span class = "named-paragraph" > Declare this constant as the special UUID string array< / span > < span class = "named-paragraph-number" > 1.5< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > switch< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ConstantInstruction::list_format< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CONST_LIST_FORMAT_NONE:< / span > < span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-vc.html#SP1_8" class = "named-paragraph-link" > < span class = "named-paragraph" > Declare this as an explicit constant< / span > < span class = "named-paragraph-number" > 1.8< / span > < / a > < / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CONST_LIST_FORMAT_SUM:< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CONST_LIST_FORMAT_PRODUCT:< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CONST_LIST_FORMAT_DIFFERENCE:< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CONST_LIST_FORMAT_QUOTIENT:< / span > < span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-vc.html#SP1_7" class = "named-paragraph-link" > < span class = "named-paragraph" > Declare this as a computed constant< / span > < span class = "named-paragraph-number" > 1.7< / span > < / a > < / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > default:< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ConstantInstruction::is_a_genuine_list_format< / span > < span class = "plain-syntax" > (< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ConstantInstruction::list_format< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ))) {< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-vc.html#SP1_6" class = "named-paragraph-link" > < span class = "named-paragraph" > Declare this as a list constant< / span > < span class = "named-paragraph-number" > 1.6< / span > < / a > < / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "ungenerated constant format"< / 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 = "plain-syntax" > }< / span >
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< / pre >
< p class = "commentary firstcommentary" > < a id = "SP1_1" class = "paragraph-anchor" > < / a > < b > § 1.1. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Declare this constant as an action name< / span > < span class = "named-paragraph-number" > 1.1< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > fa< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::duplicate< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > InterSymbol::identifier< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > con_name< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Str::delete_first_character< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > fa< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Str::delete_first_character< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > fa< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP7" class = "function-link" > < span class = "function-syntax" > Generators::new_action< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > fa< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > true_action_count< / span > < span class = "plain-syntax" > ++);< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ADD_TO_LINKED_LIST< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > fa< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > actions< / span > < span class = "plain-syntax" > );< / span >
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< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "2-vc.html#SP1" > § 1< / a > .< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP1_2" class = "paragraph-anchor" > < / a > < b > § 1.2. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Declare this constant as a fake action name< / span > < span class = "named-paragraph-number" > 1.2< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > fa< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::duplicate< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > InterSymbol::identifier< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > con_name< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Str::delete_first_character< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > fa< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Str::delete_first_character< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > fa< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP7" class = "function-link" > < span class = "function-syntax" > Generators::new_action< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > fa< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 4096< / span > < span class = "plain-syntax" > + < / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > fake_action_count< / span > < span class = "plain-syntax" > ++);< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-vc.html#SP1" > § 1< / a > .< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP1_3" class = "paragraph-anchor" > < / a > < b > § 1.3. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Ignore this constant as part of the veneer< / span > < span class = "named-paragraph-number" > 1.3< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > ;< / span >
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< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "2-vc.html#SP1" > § 1< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP1_4" class = "paragraph-anchor" > < / a > < b > § 1.4. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Declare this constant as a pseudo-object< / span > < span class = "named-paragraph-number" > 1.4< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP8" class = "function-link" > < span class = "function-syntax" > Generators::pseudo_object< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > InterSymbol::trans< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > con_name< / span > < span class = "plain-syntax" > ));< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-vc.html#SP1" > § 1< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP1_5" class = "paragraph-anchor" > < / a > < b > § 1.5. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Declare this constant as the special UUID string array< / span > < span class = "named-paragraph-number" > 1.5< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< 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" > P< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > InterValuePairs::to_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Inode::tree< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > segmentation_pos< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > saved< / 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" > content< / 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" > length< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > content< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "UUID:< / span > < span class = "comment-syntax" > ");< / span >
< span class = "string-syntax" > for (int i=0, L=Str::len(S); i< L; i++)< / span >
< span class = "string-syntax" > WRITE_TO(content, "< / span > < span class = "plain-syntax" > %< / span > < span class = "identifier-syntax" > c< / span > < span class = "string-syntax" > ", Characters::toupper(Str::get_at(S, i)));< / span >
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< span class = "string-syntax" > WRITE_TO(content, "< / span > < span class = "comment-syntax" > //");< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > length< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "%d"< / span > < span class = "plain-syntax" > , (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > Str::len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > content< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP10" class = "function-link" > < span class = "function-syntax" > Generators::begin_array< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "UUID_ARRAY"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > BYTE_ARRAY_FORMAT< / span > < span class = "plain-syntax" > , -1, & < / span > < span class = "identifier-syntax" > saved< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP10" class = "function-link" > < span class = "function-syntax" > Generators::array_entry< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > length< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > BYTE_ARRAY_FORMAT< / 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" > content< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ch< / 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" > ch< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "'%c'"< / 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 = "plain-syntax" > < / span > < a href = "2-cg2.html#SP10" class = "function-link" > < span class = "function-syntax" > Generators::array_entry< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > ch< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > BYTE_ARRAY_FORMAT< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ch< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP10" class = "function-link" > < span class = "function-syntax" > Generators::end_array< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > BYTE_ARRAY_FORMAT< / span > < span class = "plain-syntax" > , -1, & < / span > < span class = "identifier-syntax" > saved< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > length< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > content< / span > < span class = "plain-syntax" > )< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-vc.html#SP1" > § 1< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP1_6" class = "paragraph-anchor" > < / a > < b > § 1.6. < / b > Inter supports four sorts of arrays, with behaviour as laid out in this 2x2 grid:
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< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > | entries count 0, 1, 2,... | entry 0 is N, then entries count 1, 2, ..., N< / span >
< span class = "plain-syntax" > -------------+-------------------------------+-----------------------------------------------< / span >
< span class = "plain-syntax" > byte entries | BYTE_ARRAY_FORMAT | BUFFER_ARRAY_FORMAT< / span >
< span class = "plain-syntax" > -------------+-------------------------------+-----------------------------------------------< / span >
< span class = "plain-syntax" > word entries | WORD_ARRAY_FORMAT | TABLE_ARRAY_FORMAT< / span >
< span class = "plain-syntax" > -------------+-------------------------------+-----------------------------------------------< / span >
< / pre >
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< p class = "commentary" > Note that if an array assimilated from a kit has exactly one purported entry, then
in fact this should be interpreted as being that many blank entries. This number
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must however be carefully evaluated, as it may be another constant name rather
than a literal, or may even be computed.
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< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Declare this as a list constant< / span > < span class = "named-paragraph-number" > 1.6< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > format< / 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" > ConstantInstruction::is_a_byte_format< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ConstantInstruction::list_format< / 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" > ConstantInstruction::is_a_bounded_format< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ConstantInstruction::list_format< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > )))< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > format< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > BUFFER_ARRAY_FORMAT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > format< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > BYTE_ARRAY_FORMAT< / 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 = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ConstantInstruction::is_a_bounded_format< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ConstantInstruction::list_format< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > )))< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > format< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > TABLE_ARRAY_FORMAT< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > format< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > WORD_ARRAY_FORMAT< / span > < span class = "plain-syntax" > ;< / 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" > zero_count< / span > < span class = "plain-syntax" > = -1;< / 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" > entry_count< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ConstantInstruction::list_len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / 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" > ConstantInstruction::is_a_by_extent_format< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ConstantInstruction::list_format< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ))) {< / span >
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< 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::list_entry< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / 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" > zero_count< / span > < span class = "plain-syntax" > = (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > ConstantInstruction::evaluate< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > InterPackage::scope_of< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > segmentation_pos< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > saved< / 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 = "2-cg2.html#SP10" class = "function-link" > < span class = "function-syntax" > Generators::begin_array< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > InterSymbol::trans< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > con_name< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > con_name< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > format< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > zero_count< / span > < span class = "plain-syntax" > , & < / span > < span class = "identifier-syntax" > saved< / 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" > zero_count< / span > < span class = "plain-syntax" > == -1) {< / 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" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > < < / span > < span class = "identifier-syntax" > entry_count< / 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" > TEMPORARY_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > entry< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-cg.html#SP13" class = "function-link" > < span class = "function-syntax" > CodeGen::select_temporary< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > entry< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-cg.html#SP18" class = "function-link" > < span class = "function-syntax" > CodeGen::pair< / 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" > ConstantInstruction::list_entry< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < a href = "2-cg.html#SP13" class = "function-link" > < span class = "function-syntax" > CodeGen::deselect_temporary< / span > < / a > < 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 > < a href = "2-cg2.html#SP10" class = "function-link" > < span class = "function-syntax" > Generators::array_entry< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > entry< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > format< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DISCARD_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > entry< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP10" class = "function-link" > < span class = "function-syntax" > Generators::end_array< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > format< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > zero_count< / span > < span class = "plain-syntax" > , & < / span > < span class = "identifier-syntax" > saved< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-vc.html#SP1" > § 1< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP1_7" class = "paragraph-anchor" > < / a > < b > § 1.7. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Declare this as a computed constant< / span > < span class = "named-paragraph-number" > 1.7< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP11" class = "function-link" > < span class = "function-syntax" > Generators::declare_constant< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > con_name< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > COMPUTED_GDCFORM< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-vc.html#SP1" > § 1< / a > .< / li > < / ul >
2022-03-14 15:53:55 +02:00
< p class = "commentary firstcommentary" > < a id = "SP1_8" class = "paragraph-anchor" > < / a > < b > § 1.8. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Declare this as an explicit constant< / span > < span class = "named-paragraph-number" > 1.8< / span > < / span > < span class = "comment-syntax" > =< / span >
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< / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< 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" > P< / 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" > InterValuePairs::is_text< / 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" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > InterValuePairs::to_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Inode::tree< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-vc.html#SP3" class = "function-link" > < span class = "function-syntax" > VanillaConstants::defer_declaring_literal_text< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > con_name< / 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 > < a href = "2-cg2.html#SP11" class = "function-link" > < span class = "function-syntax" > Generators::declare_constant< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > con_name< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > DATA_GDCFORM< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-vc.html#SP1" > § 1< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > When called by < a href = "2-cg2.html#SP11" class = "internal" > Generators::declare_constant< / a > , generators may if they choose
make use of the following convenient function for generating the value to which a
constant name is given.
< / p >
< p class = "commentary" > Note that this assumes that the usual arithmetic operators and brackets can be
used in the syntax for literal quantities: e.g., it may produce < span class = "extract" > < span class = "extract-syntax" > (A + (3 * B))< / span > < / span >
for constants < span class = "extract" > < span class = "extract-syntax" > A< / span > < / span > , < span class = "extract" > < span class = "extract-syntax" > B< / span > < / span > . If the generator is for a language which doesn't allow
that, it will have to make other arrangements.
< / 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" > VanillaConstants::definition_value< / 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" > VanillaConstants::definition_value< / span > < / span > :< br / > Inform 6 Constants - < a href = "4-i6c.html#SP2" > § 2< / a > , < a href = "4-i6c.html#SP2_4" > § 2.4< / a > , < a href = "4-i6c.html#SP2_5" > § 2.5< / a > < br / > C Namespace - < a href = "5-cnm.html#SP7" > § 7< / 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 = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > form< / 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" > con_name< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > ) {< / span >
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< 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 = "identifier-syntax" > con_name< / 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 = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > = < / span > < a href = "2-cg.html#SP14" class = "function-link" > < span class = "function-syntax" > CodeGen::current< / span > < / a > < 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 = "reserved-syntax" > switch< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > form< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > RAW_GDCFORM:< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Str::len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > ) > < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "%S"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > {< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP20" class = "function-link" > < span class = "function-syntax" > Generators::compile_literal_number< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 1< / 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 = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > MANGLED_GDCFORM:< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Str::len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > val< / 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 > < a href = "2-cg2.html#SP16" class = "function-link" > < span class = "function-syntax" > Generators::mangle< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > OUT< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > val< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > {< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP20" class = "function-link" > < span class = "function-syntax" > Generators::compile_literal_number< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 1< / 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 = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > DATA_GDCFORM:< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-cg.html#SP18" class = "function-link" > < span class = "function-syntax" > CodeGen::pair< / 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" > ConstantInstruction::constant< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > COMPUTED_GDCFORM:< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "("< / 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" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > < < / span > < span class = "identifier-syntax" > ConstantInstruction::list_len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ); < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > > 0) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > switch< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ConstantInstruction::list_format< / 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" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CONST_LIST_FORMAT_SUM:< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > " + "< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CONST_LIST_FORMAT_PRODUCT:< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > " * "< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CONST_LIST_FORMAT_DIFFERENCE:< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > " - "< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > CONST_LIST_FORMAT_QUOTIENT:< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > " / "< / span > < span class = "plain-syntax" > ); < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< 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" > bracket< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > TRUE< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_pair< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > operand< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ConstantInstruction::list_entry< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > InterValuePairs::is_number< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > operand< / span > < span class = "plain-syntax" > )) ||< / span >
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< span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > InterValuePairs::is_symbolic< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > operand< / span > < span class = "plain-syntax" > ))) < / span > < span class = "identifier-syntax" > bracket< / 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 = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > bracket< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "("< / span > < span class = "plain-syntax" > );< / span >
2022-03-20 15:41:13 +02:00
< span class = "plain-syntax" > < / span > < a href = "2-cg.html#SP18" class = "function-link" > < span class = "function-syntax" > CodeGen::pair< / 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" > operand< / 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" > bracket< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > ")"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > ")"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LITERAL_TEXT_GDCFORM:< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-cg2.html#SP20" class = "function-link" > < span class = "function-syntax" > Generators::compile_literal_text< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > val< / 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 = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
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< 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 = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. < / b > During the above process, a constant set equal to a text literal is not
immediately declared: instead, the following mechanism is used to stash it for
later.
< / p >
2020-05-03 03:01:21 +03:00
2021-09-26 13:01:13 +03:00
< 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" > text_literal_holder< / 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" > literal_content< / 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" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > con_name< / 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" > text_literal_holder< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VanillaConstants::defer_declaring_literal_text< / 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" > VanillaConstants::defer_declaring_literal_text< / span > < / span > :< br / > < a href = "2-vc.html#SP1_8" > § 1.8< / 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" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > S< / 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" > con_name< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > text_literal_holder< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > tlh< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > CREATE< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > text_literal_holder< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > tlh< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > literal_content< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > S< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > tlh< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > con_name< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > con_name< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ADD_TO_LINKED_LIST< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > tlh< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_literal_holder< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > text_literals< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
< ul class = "endnotetexts" > < li > The structure text_literal_holder is private to this section.< / li > < / ul >
< p class = "commentary firstcommentary" > < a id = "SP4" class = "paragraph-anchor" > < / a > < b > § 4. < / b > And now it's later. We go through all of the stashed text literals, and sort
them into alphabetical order; and then declare them. What this whole business
achieves, then, is to declare text constants in alphabetical order rather than
in tree order.
< / 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" > VanillaConstants::declare_text_literals< / 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" > VanillaConstants::declare_text_literals< / 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 = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > no_tlh< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > LinkedLists::len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > text_literals< / 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" > no_tlh< / 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" > text_literal_holder< / span > < span class = "plain-syntax" > **< / span > < span class = "identifier-syntax" > sorted< / span > < span class = "plain-syntax" > = (< / span > < span class = "reserved-syntax" > text_literal_holder< / span > < span class = "plain-syntax" > **)< / span >
< span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Memory::calloc< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > no_tlh< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > sizeof< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > text_literal_holder< / span > < span class = "plain-syntax" > *), < / span > < span class = "constant-syntax" > CODE_GENERATION_MREASON< / 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" > i< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > text_literal_holder< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > tlh< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_LINKED_LIST< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > tlh< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_literal_holder< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > text_literals< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > sorted< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++] = < / span > < span class = "identifier-syntax" > tlh< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > qsort< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > sorted< / span > < span class = "plain-syntax" > , (< / span > < span class = "identifier-syntax" > size_t< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > no_tlh< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > sizeof< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > text_literal_holder< / span > < span class = "plain-syntax" > *),< / span >
< span class = "plain-syntax" > < / span > < a href = "2-vc.html#SP5" class = "function-link" > < span class = "function-syntax" > VanillaConstants::compare_tlh< / span > < / a > < 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" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > < < / span > < span class = "identifier-syntax" > no_tlh< / 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" > text_literal_holder< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > tlh< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > sorted< / 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 > < a href = "2-cg2.html#SP11" class = "function-link" > < span class = "function-syntax" > Generators::declare_constant< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gen< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > tlh< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > con_name< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > LITERAL_TEXT_GDCFORM< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > tlh< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > literal_content< / span > < span class = "plain-syntax" > );< / span >
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< 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 > Note that < span class = "extract" > < span class = "extract-syntax" > Str::cmp< / span > < / span > is a case-sensitive comparison, so < span class = "extract" > < span class = "extract-syntax" > Zebra< / span > < / span > will come
before < span class = "extract" > < span class = "extract-syntax" > armadillo< / span > < / span > , for example, < span class = "extract" > < span class = "extract-syntax" > Z< / span > < / span > being before < span class = "extract" > < span class = "extract-syntax" > a< / span > < / span > in Unicode.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VanillaConstants::compare_tlh< / 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" > VanillaConstants::compare_tlh< / span > < / span > :< br / > < a href = "2-vc.html#SP4" > § 4< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > const< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > elem1< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > const< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > elem2< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > const< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > text_literal_holder< / span > < span class = "plain-syntax" > **< / span > < span class = "identifier-syntax" > e1< / span > < span class = "plain-syntax" > = (< / span > < span class = "reserved-syntax" > const< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > text_literal_holder< / span > < span class = "plain-syntax" > **) < / span > < span class = "identifier-syntax" > elem1< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > const< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > text_literal_holder< / span > < span class = "plain-syntax" > **< / span > < span class = "identifier-syntax" > e2< / span > < span class = "plain-syntax" > = (< / span > < span class = "reserved-syntax" > const< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > text_literal_holder< / span > < span class = "plain-syntax" > **) < / span > < span class = "identifier-syntax" > elem2< / 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" > e1< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) || (*< / span > < span class = "identifier-syntax" > e2< / 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" > "Disaster while sorting text literals"< / 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" > s1< / span > < span class = "plain-syntax" > = (*< / span > < span class = "identifier-syntax" > e1< / span > < span class = "plain-syntax" > )-> < / span > < span class = "element-syntax" > literal_content< / 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" > s2< / span > < span class = "plain-syntax" > = (*< / span > < span class = "identifier-syntax" > e2< / span > < span class = "plain-syntax" > )-> < / span > < span class = "element-syntax" > literal_content< / 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" > Str::cmp< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > s1< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > s2< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP6" class = "paragraph-anchor" > < / a > < b > § 6. < / b > The remainder of this section is given over to a utility function which
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generators may want to use: it turns an Inter-notation text for a real number
into an unsigned 32-bit integer which can represent that number at runtime
(provided we are on a 32-bit computer: the Z-machine need not apply).
< / p >
< p class = "commentary" > No error messages should be printed, of course, because the syntax should have
been checked before the text here entered the Inter hierarchy.
< / p >
< p class = "commentary" > The code below is adapted from additions made by Andrew Plotkin to the Inform 6
compiler to accommodate floating-point arithmetic.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "identifier-syntax" > uint32_t< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VanillaConstants::textual_real_to_uint32< / 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" > VanillaConstants::textual_real_to_uint32< / span > < / span > :< br / > C Literals - < a href = "5-clt.html#SP4" > § 4< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > text_stream< / span > < 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 = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > at< / 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" > wchar_t< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > lookahead< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::get_at< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > at< / 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" > expo< / span > < span class = "plain-syntax" > =0; < / span > < span class = "reserved-syntax" > double< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > intv< / span > < span class = "plain-syntax" > =0, < / span > < span class = "identifier-syntax" > fracv< / span > < span class = "plain-syntax" > =0;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > expocount< / span > < span class = "plain-syntax" > =0, < / span > < span class = "identifier-syntax" > intcount< / span > < span class = "plain-syntax" > =0, < / span > < span class = "identifier-syntax" > fraccount< / span > < span class = "plain-syntax" > =0, < / span > < span class = "identifier-syntax" > signbit< / span > < span class = "plain-syntax" > =0;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lookahead< / 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" > signbit< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > lookahead< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::get_at< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > at< / 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" > lookahead< / 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" > signbit< / 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" > lookahead< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::get_at< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > at< / span > < span class = "plain-syntax" > ++);< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > while< / span > < span class = "plain-syntax" > (< / span > < a href = "2-vc.html#SP6" class = "function-link" > < span class = "function-syntax" > VanillaConstants::character_digit_value< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lookahead< / span > < span class = "plain-syntax" > ) < < / span > < span class = "constant-syntax" > 10< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > intv< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 10< / span > < span class = "plain-syntax" > .0*< / span > < span class = "identifier-syntax" > intv< / span > < span class = "plain-syntax" > + < / span > < a href = "2-vc.html#SP6" class = "function-link" > < span class = "function-syntax" > VanillaConstants::character_digit_value< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lookahead< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > intcount< / span > < span class = "plain-syntax" > ++;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > lookahead< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::get_at< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > at< / 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" > lookahead< / span > < span class = "plain-syntax" > == < / span > < span class = "character-syntax" > '.'< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > double< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > fracpow< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > .0;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > lookahead< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::get_at< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > at< / span > < span class = "plain-syntax" > ++);< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > while< / span > < span class = "plain-syntax" > (< / span > < a href = "2-vc.html#SP6" class = "function-link" > < span class = "function-syntax" > VanillaConstants::character_digit_value< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lookahead< / span > < span class = "plain-syntax" > ) < < / span > < span class = "constant-syntax" > 10< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > fracpow< / span > < span class = "plain-syntax" > *= < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > .1;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > fracv< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > fracv< / span > < span class = "plain-syntax" > + < / span > < span class = "identifier-syntax" > fracpow< / span > < span class = "plain-syntax" > *< / span > < a href = "2-vc.html#SP6" class = "function-link" > < span class = "function-syntax" > VanillaConstants::character_digit_value< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lookahead< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > fraccount< / span > < span class = "plain-syntax" > ++;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > lookahead< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::get_at< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > at< / span > < span class = "plain-syntax" > ++);< / 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" > lookahead< / span > < span class = "plain-syntax" > == < / span > < span class = "character-syntax" > 'e'< / span > < span class = "plain-syntax" > || < / span > < span class = "identifier-syntax" > lookahead< / span > < span class = "plain-syntax" > == < / span > < span class = "character-syntax" > 'E'< / 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" > exposign< / 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" > lookahead< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::get_at< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > at< / 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" > lookahead< / span > < span class = "plain-syntax" > == < / span > < span class = "character-syntax" > '+'< / span > < span class = "plain-syntax" > || < / span > < span class = "identifier-syntax" > lookahead< / 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" > exposign< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > lookahead< / 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" > lookahead< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::get_at< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > at< / span > < span class = "plain-syntax" > ++);< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > while< / span > < span class = "plain-syntax" > (< / span > < a href = "2-vc.html#SP6" class = "function-link" > < span class = "function-syntax" > VanillaConstants::character_digit_value< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lookahead< / span > < span class = "plain-syntax" > ) < < / span > < span class = "constant-syntax" > 10< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 10< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > + < / span > < a href = "2-vc.html#SP6" class = "function-link" > < span class = "function-syntax" > VanillaConstants::character_digit_value< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lookahead< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > expocount< / span > < span class = "plain-syntax" > ++;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > lookahead< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::get_at< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > T< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > at< / 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" > expocount< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > STDERR< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "Floating-point literal '%S' must have digits after the 'e'"< / 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" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "bad floating-point literal"< / 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" > exposign< / span > < span class = "plain-syntax" > ) { < / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > = -< / span > < span class = "identifier-syntax" > expo< / 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" > intcount< / span > < span class = "plain-syntax" > + < / span > < span class = "identifier-syntax" > fraccount< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > STDERR< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "Floating-point literal '%S' must have digits"< / 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" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "bad floating-point literal"< / span > < 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 > < a href = "2-vc.html#SP8" class = "function-link" > < span class = "function-syntax" > VanillaConstants::real_components_to_uint32< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > signbit< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > intv< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > fracv< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > expo< / 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 = "function-syntax" > VanillaConstants::character_digit_value< / 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 = "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" > '0'< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > c< / span > < span class = "plain-syntax" > < = < / span > < span class = "character-syntax" > '9'< / span > < span class = "plain-syntax" > )) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > c< / span > < span class = "plain-syntax" > - < / span > < span class = "character-syntax" > '0'< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 10< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP7" class = "paragraph-anchor" > < / a > < b > § 7. < / b > And this returns 10 raised to the power < span class = "extract" > < span class = "extract-syntax" > expo< / span > < / span > , which is an integer. Andrew
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Plotkin refers to this as "cheap" because it avoids the C library < span class = "extract" > < span class = "extract-syntax" > pow10< / span > < / span > ,
which is awkward on some platforms.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > ifndef< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > POW10_RANGE< / span >
< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > define< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > POW10_RANGE< / span > < span class = "plain-syntax" > (8)< / span >
< span class = "plain-syntax" > #< / span > < span class = "identifier-syntax" > endif< / span >
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< span class = "reserved-syntax" > double< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VanillaConstants::pow10_cheap< / 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" > VanillaConstants::pow10_cheap< / span > < / span > :< br / > < a href = "2-vc.html#SP8" > § 8< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > static< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > double< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > powers< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > POW10_RANGE< / span > < span class = "plain-syntax" > *2+1] = {< / span >
< span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > .00000001, < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > .0000001, < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > .000001, < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > .00001, < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > .0001, < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > .001, < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > .01, < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > .1,< / span >
< span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > .0,< / span >
< span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 10< / span > < span class = "plain-syntax" > .0, < / span > < span class = "constant-syntax" > 100< / span > < span class = "plain-syntax" > .0, < / span > < span class = "constant-syntax" > 1000< / span > < span class = "plain-syntax" > .0, < / span > < span class = "constant-syntax" > 10000< / span > < span class = "plain-syntax" > .0, < / span > < span class = "constant-syntax" > 100000< / span > < span class = "plain-syntax" > .0, < / span > < span class = "constant-syntax" > 1000000< / span > < span class = "plain-syntax" > .0, < / span > < span class = "constant-syntax" > 10000000< / span > < span class = "plain-syntax" > .0, < / span > < span class = "constant-syntax" > 100000000< / span > < span class = "plain-syntax" > .0< / span >
< span class = "plain-syntax" > };< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > double< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > res< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > .0;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > expo< / 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" > for< / span > < span class = "plain-syntax" > (; < / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > < -< / span > < span class = "identifier-syntax" > POW10_RANGE< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > += < / span > < span class = "identifier-syntax" > POW10_RANGE< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > res< / span > < span class = "plain-syntax" > *= < / span > < span class = "identifier-syntax" > powers< / span > < span class = "plain-syntax" > [0];< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > res< / span > < span class = "plain-syntax" > * < / span > < span class = "identifier-syntax" > powers< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > POW10_RANGE< / span > < span class = "plain-syntax" > +< / span > < span class = "identifier-syntax" > expo< / 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 = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (; < / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > > < / span > < span class = "identifier-syntax" > POW10_RANGE< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > -= < / span > < span class = "identifier-syntax" > POW10_RANGE< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > res< / span > < span class = "plain-syntax" > *= < / span > < span class = "identifier-syntax" > powers< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > POW10_RANGE< / span > < span class = "plain-syntax" > *2];< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > res< / span > < span class = "plain-syntax" > * < / span > < span class = "identifier-syntax" > powers< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > POW10_RANGE< / span > < span class = "plain-syntax" > +< / span > < span class = "identifier-syntax" > expo< / 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 = "SP8" class = "paragraph-anchor" > < / a > < b > § 8. < / b > Finally, this function returns the IEEE-754 single-precision encoding of a
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floating-point number from its various components.
< / p >
< p class = "commentary" > See < a href = "http://www.psc.edu/general/software/packages/ieee/ieee.php" class = "external" > http://www.psc.edu/general/software/packages/ieee/ieee.php< / a > for an explanation.
< / p >
< p class = "commentary" > If the magnitude is too large (beyond about 3.4e+38), this returns
an infinite value (0x7f800000 or 0xff800000). If the magnitude is too
small (below about 1e-45), this returns a zero value (0x00000000 or
0x80000000). If any of the inputs are NaN, this returns NaN.
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "identifier-syntax" > uint32_t< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > VanillaConstants::real_components_to_uint32< / 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" > VanillaConstants::real_components_to_uint32< / span > < / span > :< br / > < a href = "2-vc.html#SP6" > § 6< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > signbit< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > double< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > intv< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > double< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > fracv< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > double< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > absval< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > intv< / span > < span class = "plain-syntax" > + < / span > < span class = "identifier-syntax" > fracv< / span > < span class = "plain-syntax" > ) * < / span > < a href = "2-vc.html#SP7" class = "function-link" > < span class = "function-syntax" > VanillaConstants::pow10_cheap< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > uint32_t< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > sign< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > signbit< / span > < span class = "plain-syntax" > ? < / span > < span class = "constant-syntax" > 0x80000000< / span > < span class = "plain-syntax" > : < / span > < span class = "constant-syntax" > 0x0< / 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" > isinf< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > absval< / span > < span class = "plain-syntax" > )) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > sign< / span > < span class = "plain-syntax" > | < / span > < span class = "constant-syntax" > 0x7f800000< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > infinity< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > isnan< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > absval< / span > < span class = "plain-syntax" > )) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > sign< / span > < span class = "plain-syntax" > | < / span > < span class = "constant-syntax" > 0x7fc00000< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > NaN< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > double< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > mant< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > frexp< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > absval< / span > < span class = "plain-syntax" > , & < / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "comment-syntax" > Normalize mantissa to be in the range [1.0, 2.0)< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (0.5 < = < / span > < span class = "identifier-syntax" > mant< / span > < span class = "plain-syntax" > & & < / span > < span class = "identifier-syntax" > mant< / span > < span class = "plain-syntax" > < < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > .0) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > mant< / span > < span class = "plain-syntax" > *= < / span > < span class = "constant-syntax" > 2< / span > < span class = "plain-syntax" > .0;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > expo< / 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" > mant< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > .0) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > expo< / 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" > else< / 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" > sign< / span > < span class = "plain-syntax" > | < / span > < span class = "constant-syntax" > 0x7f800000< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > infinity< / 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" > expo< / span > < span class = "plain-syntax" > > = < / span > < span class = "constant-syntax" > 128< / 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" > sign< / span > < span class = "plain-syntax" > | < / span > < span class = "constant-syntax" > 0x7f800000< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > infinity< / 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" > expo< / span > < span class = "plain-syntax" > < -126) {< / span >
< span class = "plain-syntax" > < / span > < span class = "comment-syntax" > Denormalized (very small) number< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > mant< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ldexp< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > mant< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 126< / span > < span class = "plain-syntax" > + < / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > expo< / 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" > else< / span > < span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (!(< / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > & & < / span > < span class = "identifier-syntax" > mant< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > .0)) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > += < / span > < span class = "constant-syntax" > 127< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > mant< / span > < span class = "plain-syntax" > -= < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > .0; < / span > < span class = "comment-syntax" > Get rid of leading 1< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > mant< / span > < span class = "plain-syntax" > *= < / span > < span class = "constant-syntax" > 8388608< / span > < span class = "plain-syntax" > .0; < / span > < span class = "comment-syntax" > 2^23< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > uint32_t< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > fbits< / span > < span class = "plain-syntax" > = (< / span > < span class = "identifier-syntax" > uint32_t< / span > < span class = "plain-syntax" > )(< / span > < span class = "identifier-syntax" > mant< / span > < span class = "plain-syntax" > + < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > .5); < / span > < span class = "comment-syntax" > round mant to nearest int< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > fbits< / span > < span class = "plain-syntax" > > > < / span > < span class = "constant-syntax" > 23< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "comment-syntax" > The carry propagated out of a string of 23 1 bits.< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > fbits< / 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" > expo< / 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" > expo< / span > < span class = "plain-syntax" > > = < / span > < span class = "constant-syntax" > 255< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > sign< / span > < span class = "plain-syntax" > | < / span > < span class = "constant-syntax" > 0x7f800000< / span > < span class = "plain-syntax" > ; < / span > < span class = "comment-syntax" > infinity< / 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" > sign< / span > < span class = "plain-syntax" > ) | ((< / span > < span class = "identifier-syntax" > uint32_t< / span > < span class = "plain-syntax" > )(< / span > < span class = "identifier-syntax" > expo< / span > < span class = "plain-syntax" > < < < / span > < span class = "constant-syntax" > 23< / span > < span class = "plain-syntax" > )) | (< / span > < span class = "identifier-syntax" > fbits< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
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< nav role = "progress" > < div class = "progresscontainer" >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "2-vnl.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 = "progresscurrent" > vc< / li > < li class = "progresssection" > < a href = "2-vf.html" > vf< / a > < / 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-vf.html" > ❯ < / a > < / li > < / ul > < / div >
2020-05-03 03:01:21 +03:00
< / nav > <!-- End of weave -->
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2020-03-19 02:11:25 +02:00
< / main >
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< / body >
< / html >
