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<!-- Weave of 'Shared Variables' generated by Inweb -->
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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../compiler.html" > Inform7< / a > < / li > < li > < a href = "index.html" > runtime< / a > < / li > < li > < a href = "index.html#2" > Chapter 2: Emission< / a > < / li > < li > < b > Shared Variables< / b > < / li > < / ul > < / div >
< p class = "purpose" > Functions to create sets of shared variables.< / p >
< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > Shared variables are fleeting things: they come and go at runtime, and
therefore they can't be set up statically by the compiler — they must be
dynamically created by a function which is called at runtime each time they
need to come into being.
< / p >
< p class = "commentary" > Each set therefore has its own "creator function", and the following compiles it:
< / 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" > RTSharedVariables::compile_creator_fn< / 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" > RTSharedVariables::compile_creator_fn< / span > < / span > :< br / > Activities - < a href = "5-act.html#SP7" > § 7< / a > < br / > Rulebooks - < a href = "5-rlb.html#SP7_3" > § 7.3< / a > < br / > Actions - < a href = "5-act2.html#SP8_4" > § 8.4< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > shared_variable_set< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > set< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > inter_name< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > iname< / 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" > set< / 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 shared variable set"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > packaging_state< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > save< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Functions::begin< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > iname< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > pos_s< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > LocalVariables::new_other_as_symbol< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "pos"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_symbol< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > state_s< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > LocalVariables::new_other_as_symbol< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > I< / span > < span class = "string-syntax" > "state"< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP13" class = "function-link" > < span class = "function-syntax" > EmitCode::inv< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IFELSE_BIP< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::down< / span > < / a > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP13" class = "function-link" > < span class = "function-syntax" > EmitCode::inv< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > EQ_BIP< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::down< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP7" class = "function-link" > < span class = "function-syntax" > EmitCode::val_symbol< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K_value< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > state_s< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP7" class = "function-link" > < span class = "function-syntax" > EmitCode::val_number< / span > < / a > < span class = "plain-syntax" > (1);< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::up< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP5" class = "function-link" > < span class = "function-syntax" > EmitCode::code< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::down< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-sv.html#SP1_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Compile frame creator if state is set< / span > < span class = "named-paragraph-number" > 1.1< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::up< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP5" class = "function-link" > < span class = "function-syntax" > EmitCode::code< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::down< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "2-sv.html#SP1_2" class = "named-paragraph-link" > < span class = "named-paragraph" > Compile frame creator if state is clear< / span > < span class = "named-paragraph-number" > 1.2< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::up< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::up< / span > < / a > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP13" class = "function-link" > < span class = "function-syntax" > EmitCode::inv< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > RETURN_BIP< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::down< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP7" class = "function-link" > < span class = "function-syntax" > EmitCode::val_number< / span > < / a > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > inter_ti< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > LinkedLists::len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > set< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > variables< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::up< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Functions::end< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > save< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< / 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" > Compile frame creator if state is set< / span > < span class = "named-paragraph-number" > 1.1< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > shared_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > shv< / 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" > shv< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > shared_variable< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > set< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > variables< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > nonlocal_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > SharedVariables::get_variable< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > shv< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NonlocalVariables::kind< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP13" class = "function-link" > < span class = "function-syntax" > EmitCode::inv< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > STORE_BIP< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::down< / span > < / a > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP5" class = "function-link" > < span class = "function-syntax" > EmitCode::reference< / span > < / a > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::down< / span > < / a > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP13" class = "function-link" > < span class = "function-syntax" > EmitCode::inv< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > LOOKUP_BIP< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::down< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP7" class = "function-link" > < span class = "function-syntax" > EmitCode::val_iname< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K_value< / span > < span class = "plain-syntax" > , < / span > < a href = "2-hrr.html#SP11" class = "function-link" > < span class = "function-syntax" > Hierarchy::find< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > MSTACK_HL< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP7" class = "function-link" > < span class = "function-syntax" > EmitCode::val_symbol< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K_value< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > pos_s< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::up< / span > < / a > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::up< / span > < / a > < 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" > Kinds::Behaviour::uses_block_values< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > ))< / span >
< span class = "plain-syntax" > < / span > < a href = "2-th.html#SP5" class = "function-link" > < span class = "function-syntax" > TheHeap::emit_allocation< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "2-th.html#SP4" class = "function-link" > < span class = "function-syntax" > TheHeap::make_allocation< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > , -1));< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span >
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< span class = "plain-syntax" > < / span > < a href = "5-vrb.html#SP15" class = "function-link" > < span class = "function-syntax" > RTVariables::initial_value_as_val< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::up< / span > < / a > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP13" class = "function-link" > < span class = "function-syntax" > EmitCode::inv< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > POSTINCREMENT_BIP< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::down< / span > < / a > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP12" class = "function-link" > < span class = "function-syntax" > EmitCode::ref_symbol< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K_value< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > pos_s< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::up< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-sv.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" > Compile frame creator if state is clear< / span > < span class = "named-paragraph-number" > 1.2< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > shared_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > shv< / 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" > shv< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > shared_variable< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > set< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > variables< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > nonlocal_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > q< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > SharedVariables::get_variable< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > shv< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NonlocalVariables::kind< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > q< / 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" > Kinds::Behaviour::uses_block_values< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > )) {< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP13" class = "function-link" > < span class = "function-syntax" > EmitCode::call< / span > < / a > < span class = "plain-syntax" > (< / span > < a href = "2-hrr.html#SP11" class = "function-link" > < span class = "function-syntax" > Hierarchy::find< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > BLKVALUEFREE_HL< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::down< / span > < / a > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP13" class = "function-link" > < span class = "function-syntax" > EmitCode::inv< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > LOOKUP_BIP< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::down< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP7" class = "function-link" > < span class = "function-syntax" > EmitCode::val_iname< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K_value< / span > < span class = "plain-syntax" > , < / span > < a href = "2-hrr.html#SP11" class = "function-link" > < span class = "function-syntax" > Hierarchy::find< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > MSTACK_HL< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP7" class = "function-link" > < span class = "function-syntax" > EmitCode::val_symbol< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K_value< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > pos_s< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::up< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::up< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP13" class = "function-link" > < span class = "function-syntax" > EmitCode::inv< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > POSTINCREMENT_BIP< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::down< / span > < / a > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP12" class = "function-link" > < span class = "function-syntax" > EmitCode::ref_symbol< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K_value< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > pos_s< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-ec.html#SP3" class = "function-link" > < span class = "function-syntax" > EmitCode::up< / span > < / a > < span class = "plain-syntax" > ();< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< ul class = "endnotetexts" > < li > This code is used in < a href = "2-sv.html#SP1" > § 1< / a > .< / li > < / ul >
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< / nav > <!-- End of weave -->
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