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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../compiler.html" > Inter Modules< / a > < / li > < li > < a href = "index.html" > bytecode< / a > < / li > < li > < a href = "index.html#5" > Chapter 5: Code Constructs< / a > < / li > < li > < b > The Label Construct< / b > < / li > < / ul > < / div >
< p class = "purpose" > Defining the label construct.< / p >
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< ul class = "toc" > < li > < a href = "5-tlc2.html#SP1" > § 1. Definition< / a > < / li > < li > < a href = "5-tlc2.html#SP2" > § 2. Instructions< / a > < / li > < li > < a href = "5-tlc2.html#SP4" > § 4. Creating from textual Inter syntax< / a > < / li > < li > < a href = "5-tlc2.html#SP5" > § 5. Writing to textual Inter syntax< / a > < / li > < li > < a href = "5-tlc2.html#SP6" > § 6. Access function< / a > < / li > < / ul > < hr class = "tocbar" >
< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. Definition. < / b > For what this does and why it is used, see < a href = "../inter/M-ti.html" class = "internal" > Textual Inter (in inter)< / a > .
< / 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" > LabelInstruction::define_construct< / 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" > LabelInstruction::define_construct< / span > < / span > :< br / > Inter Constructs - < a href = "3-ic.html#SP15" > § 15< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inter_construct< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > = < / span > < a href = "3-ic.html#SP1" class = "function-link" > < span class = "function-syntax" > InterInstruction::create_construct< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > LABEL_IST< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "label"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-ic.html#SP2" class = "function-link" > < span class = "function-syntax" > InterInstruction::defines_symbol_in_fields< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > DEFN_LABEL_IFLD< / span > < span class = "plain-syntax" > , -1);< / span >
< span class = "plain-syntax" > < / span > < a href = "3-ic.html#SP8" class = "function-link" > < span class = "function-syntax" > InterInstruction::specify_syntax< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > ".IDENTIFIER"< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-ic.html#SP4" class = "function-link" > < span class = "function-syntax" > InterInstruction::fix_instruction_length_between< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 3< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 3< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-ic.html#SP3" class = "function-link" > < span class = "function-syntax" > InterInstruction::allow_in_depth_range< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > INFINITELY_DEEP< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-ic.html#SP3" class = "function-link" > < span class = "function-syntax" > InterInstruction::permit< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > INSIDE_CODE_PACKAGE_ICUP< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-ic.html#SP3" class = "function-link" > < span class = "function-syntax" > InterInstruction::permit< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > CAN_HAVE_CHILDREN_ICUP< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > METHOD_ADD< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > CONSTRUCT_READ_MTID< / span > < span class = "plain-syntax" > , < / span > < a href = "5-tlc2.html#SP4" class = "function-link" > < span class = "function-syntax" > LabelInstruction::read< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > METHOD_ADD< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > CONSTRUCT_VERIFY_MTID< / span > < span class = "plain-syntax" > , < / span > < a href = "5-tlc2.html#SP3" class = "function-link" > < span class = "function-syntax" > LabelInstruction::verify< / span > < / a > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > METHOD_ADD< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > CONSTRUCT_WRITE_MTID< / span > < span class = "plain-syntax" > , < / span > < a href = "5-tlc2.html#SP5" class = "function-link" > < span class = "function-syntax" > LabelInstruction::write< / span > < / a > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. Instructions. < / b > In bytecode, the frame of a < span class = "extract" > < span class = "extract-syntax" > label< / span > < / span > instruction is laid out with the two
compulsory words < span class = "extract" > < span class = "extract-syntax" > ID_IFLD< / span > < / span > and < span class = "extract" > < span class = "extract-syntax" > LEVEL_IFLD< / span > < / span > , followed by:
< / p >
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< pre class = "definitions code-font" > < span class = "definition-keyword" > define< / span > < span class = "constant-syntax" > DEFN_LABEL_IFLD< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 2< / span >
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< / pre >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > inter_error_message< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > LabelInstruction::new< / 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" > LabelInstruction::new< / span > < / span > :< br / > < a href = "5-tlc2.html#SP4" > § 4< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > inter_bookmark< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > IBM< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > lab_name< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "constant-syntax" > inter_ti< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > level< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > inter_error_location< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > eloc< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inter_tree_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > = < / span > < a href = "2-in.html#SP5" class = "function-link" > < span class = "function-syntax" > Inode::new_with_1_data_field< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IBM< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > LABEL_IST< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > /* < / span > < span class = "identifier-syntax" > DEFN_LABEL_IFLD:< / span > < span class = "plain-syntax" > */ < / span > < a href = "2-st.html#SP16" class = "function-link" > < span class = "function-syntax" > InterSymbolsTable::id_at_bookmark< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IBM< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > lab_name< / span > < span class = "plain-syntax" > ),< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > eloc< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > level< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inter_error_message< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "3-vi.html#SP1" class = "function-link" > < span class = "function-syntax" > VerifyingInter::instruction< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "2-bkm.html#SP6" class = "function-link" > < span class = "function-syntax" > InterBookmark::package< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IBM< / 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" > E< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-np.html#SP3" class = "function-link" > < span class = "function-syntax" > NodePlacement::move_to_moving_bookmark< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > IBM< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. < / b > Verification consists only of sanity checks.
< / 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" > LabelInstruction::verify< / 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" > LabelInstruction::verify< / span > < / span > :< br / > < a href = "5-tlc2.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > inter_construct< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > inter_tree_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > inter_package< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > owner< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inter_error_message< / span > < span class = "plain-syntax" > **< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > lab_name< / span > < span class = "plain-syntax" > = < / span > < a href = "5-tlc2.html#SP6" class = "function-link" > < span class = "function-syntax" > LabelInstruction::label_symbol< / span > < / a > < 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 > < a href = "2-sym.html#SP11" class = "function-link" > < span class = "function-syntax" > InterSymbol::is_label< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lab_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" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "2-in.html#SP15" class = "function-link" > < span class = "function-syntax" > Inode::error< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "not a label"< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lab_name< / span > < span class = "plain-syntax" > )?(< / span > < a href = "2-sym.html#SP19" class = "function-link" > < span class = "function-syntax" > InterSymbol::identifier< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lab_name< / span > < span class = "plain-syntax" > )):< / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > instruction< / span > < span class = "plain-syntax" > [< / span > < span class = "constant-syntax" > LEVEL_IFLD< / 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" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "2-in.html#SP15" class = "function-link" > < span class = "function-syntax" > Inode::error< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "label with bad level"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
< p class = "commentary firstcommentary" > < a id = "SP4" class = "paragraph-anchor" > < / a > < b > § 4. Creating from textual Inter syntax. < / b > Note that a < span class = "extract" > < span class = "extract-syntax" > .LABEL< / span > < / span > can occur either before or after it is used in < span class = "extract" > < span class = "extract-syntax" > lab< / span > < / span > instructions,
so that the label name might already have been created: see < a href = "5-tlc.html#SP4" class = "internal" > LabInstruction::read< / a > .
< / 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" > LabelInstruction::read< / 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" > LabelInstruction::read< / span > < / span > :< br / > < a href = "5-tlc2.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > inter_construct< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > inter_bookmark< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > IBM< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > inter_line_parse< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > ilp< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inter_error_location< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > eloc< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > inter_error_message< / span > < span class = "plain-syntax" > **< / span > < span class = "identifier-syntax" > E< / 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" > label_name< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ilp< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > mr< / span > < span class = "plain-syntax" > .< / span > < span class = "identifier-syntax" > exp< / span > < span class = "plain-syntax" > [0];< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > label_s< / span > < span class = "plain-syntax" > =< / span >
< span class = "plain-syntax" > < / span > < a href = "2-st.html#SP6" class = "function-link" > < span class = "function-syntax" > InterSymbolsTable::symbol_from_name< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "2-bkm.html#SP7" class = "function-link" > < span class = "function-syntax" > InterBookmark::scope< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IBM< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > label_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" > label_s< / 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" > label_s< / span > < span class = "plain-syntax" > = < / span > < a href = "3-iitf.html#SP4" class = "function-link" > < span class = "function-syntax" > TextualInter::new_symbol< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > eloc< / span > < span class = "plain-syntax" > , < / span > < a href = "2-bkm.html#SP7" class = "function-link" > < span class = "function-syntax" > InterBookmark::scope< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IBM< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > label_name< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > E< / 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" > E< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / 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 > < a href = "2-sym.html#SP15" class = "function-link" > < span class = "function-syntax" > InterSymbol::is_defined< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > label_s< / span > < span class = "plain-syntax" > )) {< / span >
< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "3-ie.html#SP4" class = "function-link" > < span class = "function-syntax" > InterErrors::plain< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "label_s defined in function once already"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > eloc< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < a href = "2-sym.html#SP11" class = "function-link" > < span class = "function-syntax" > InterSymbol::make_label< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > label_s< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > E< / span > < span class = "plain-syntax" > = < / span > < a href = "5-tlc2.html#SP2" class = "function-link" > < span class = "function-syntax" > LabelInstruction::new< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IBM< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > label_s< / span > < span class = "plain-syntax" > , (< / span > < span class = "constant-syntax" > inter_ti< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > ilp< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > indent_level< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > eloc< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP5" class = "paragraph-anchor" > < / a > < b > § 5. Writing to textual Inter syntax. < / b > < / p >
< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > LabelInstruction::write< / 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" > LabelInstruction::write< / span > < / span > :< br / > < a href = "5-tlc2.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > inter_construct< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > IC< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > OUTPUT_STREAM< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-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 = "reserved-syntax" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > label_s< / span > < span class = "plain-syntax" > = < / span > < a href = "5-tlc2.html#SP6" class = "function-link" > < span class = "function-syntax" > LabelInstruction::label_symbol< / span > < / a > < 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" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "%S"< / span > < span class = "plain-syntax" > , < / span > < a href = "2-sym.html#SP19" class = "function-link" > < span class = "function-syntax" > InterSymbol::identifier< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > label_s< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP6" class = "paragraph-anchor" > < / a > < b > § 6. Access function. < / b > < / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > LabelInstruction::label_symbol< / 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" > LabelInstruction::label_symbol< / span > < / span > :< br / > < a href = "5-tlc2.html#SP3" > § 3< / a > , < a href = "5-tlc2.html#SP5" > § 5< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > inter_tree_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > .< / span > < span class = "element-syntax" > instruction< / span > < span class = "plain-syntax" > [< / span > < span class = "constant-syntax" > ID_IFLD< / span > < span class = "plain-syntax" > ] != < / span > < span class = "constant-syntax" > LABEL_IST< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < a href = "2-st.html#SP13" class = "function-link" > < span class = "function-syntax" > InterSymbolsTable::symbol_from_ID_at_node< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > P< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > DEFN_LABEL_IFLD< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
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< nav role = "progress" > < div class = "progresscontainer" >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "5-tlc.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-wtmd.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-bm.html" > 1< / a > < / li > < li class = "progresschapter" > < a href = "2-it.html" > 2< / a > < / li > < li class = "progresschapter" > < a href = "3-ic.html" > 3< / a > < / li > < li class = "progresschapter" > < a href = "4-tac.html" > 4< / a > < / li > < li class = "progresscurrentchapter" > 5< / li > < li class = "progresssection" > < a href = "5-tac.html" > tac< / a > < / li > < li class = "progresssection" > < a href = "5-tcc.html" > tcc< / a > < / li > < li class = "progresssection" > < a href = "5-tcc2.html" > tcc2< / a > < / li > < li class = "progresssection" > < a href = "5-tec.html" > tec< / a > < / li > < li class = "progresssection" > < a href = "5-tic.html" > tic< / a > < / li > < li class = "progresssection" > < a href = "5-tlc.html" > tlc< / a > < / li > < li class = "progresscurrent" > tlc2< / li > < li class = "progresssection" > < a href = "5-tlc3.html" > tlc3< / a > < / li > < li class = "progresssection" > < a href = "5-trc.html" > trc< / a > < / li > < li class = "progresssection" > < a href = "5-trc2.html" > trc2< / a > < / li > < li class = "progresssection" > < a href = "5-tsc.html" > tsc< / a > < / li > < li class = "progresssection" > < a href = "5-tvc.html" > tvc< / a > < / li > < li class = "progresschapter" > < a href = "6-tpc.html" > 6< / a > < / li > < li class = "progressnext" > < a href = "5-tlc3.html" > ❯ < / a > < / li > < / ul > < / div >
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< / nav > <!-- End of weave -->
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< / main >
< / body >
< / html >