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<!-- Weave of 'Compile Invocations As Calls' generated by Inweb -->
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< ul class = "crumbs" > < li > < a href = "../overview.html" > Home< / a > < / li > < li > < a href = "../inform7n.html" > Inform7< / a > < / li > < li > < a href = "index.html" > imperative< / a > < / li > < li > < a href = "index.html#5" > Chapter 5: Invocations< / a > < / li > < li > < b > Compile Invocations As Calls< / b > < / li > < / ul > < / div >
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< p class = "purpose" > An invocation defined with Inform 7 source text is made with an Inter function call.< / p >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > Compiling an invocation into a call to an Inter function is simple enough:
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > CallingFunctions::csi_by_call< / 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" > CallingFunctions::csi_by_call< / span > < / span > :< br / > Compile Invocations - < a href = "5-ci.html#SP2_1_2" > § 2.1.2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > value_holster< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > VH< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > inv< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > source_location< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > where_from< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > tokens_packet< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > tokens< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > id_body< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > idb< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Node::get_phrase_invoked< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > inv< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_name< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > IS< / span > < span class = "plain-syntax" > = < / span > < a href = "3-pr.html#SP1" class = "function-link" > < span class = "function-syntax" > PhraseRequests::complex_request< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > idb< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > tokens< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > fn_kind< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Node::get_kind_variable_declarations< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > inv< / span > < span class = "plain-syntax" > ), < / span > < span class = "identifier-syntax" > Node::get_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > inv< / span > < span class = "plain-syntax" > ));< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOGIF< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > MATCHING< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "Calling function %n with kind %u from $e\n"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > IS< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > tokens< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > fn_kind< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > inv< / 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" > options_supplied< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Invocations::get_phrase_options_bitmap< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > inv< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Node::get_phrase_options_invoked< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > inv< / span > < span class = "plain-syntax" > ) == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > options_supplied< / span > < span class = "plain-syntax" > = -1;< / 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" > VH< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > vhmode_wanted< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > INTER_VAL_VHMODE< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > VH< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > vhmode_provided< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > INTER_VAL_VHMODE< / 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" > VH< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > vhmode_provided< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > INTER_VOID_VHMODE< / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < a href = "5-ciac.html#SP2" class = "function-link" > < span class = "function-syntax" > CallingFunctions::direct_function_call< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > tokens< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > IS< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > options_supplied< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > The following can be used to call any phrase compiled to an I6 routine,
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and it's used not only by the code above, but also when calling a
phrase value stored dynamically at run-time.
< / 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" > CallingFunctions::direct_function_call< / 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" > CallingFunctions::direct_function_call< / span > < / span > :< br / > < a href = "5-ciac.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > tokens_packet< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > tokens< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > inter_name< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > identifier< / 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" > phrase_options< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > kind< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > return_kind< / 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 = "named-paragraph-container code-font" > < a href = "5-ciac.html#SP2_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Compute the return kind of the phrase< / span > < span class = "named-paragraph-number" > 2.1< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > EmitCode::call< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > EmitCode::down< / span > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "5-ciac.html#SP2_2" class = "named-paragraph-link" > < span class = "named-paragraph" > Emit the comma-separated list of arguments< / span > < span class = "named-paragraph-number" > 2.2< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > EmitCode::up< / span > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > }< / span >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP2_1" class = "paragraph-anchor" > < / a > < b > § 2.1. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Compute the return kind of the phrase< / span > < span class = "named-paragraph-number" > 2.1< / 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" >
< 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" > tokens< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > fn_kind< / 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" > Kinds::get_construct< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > ) != < / span > < span class = "identifier-syntax" > CON_phrase< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "no function kind"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Kinds::binary_construction_material< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > K< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > , & < / span > < span class = "identifier-syntax" > return_kind< / span > < span class = "plain-syntax" > );< / span >
< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "5-ciac.html#SP2" > § 2< / a > , < a href = "5-ciac.html#SP3" > § 3< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP2_2" class = "paragraph-anchor" > < / a > < b > § 2.2. < / b > If the return kind stores values on the heap, we must call the function with
a pointer to a new value of that kind as the first argument. Arguments corresponding
to the tokens then follow, and finally the optional bitmap of phrase options.
< / p >
< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Emit the comma-separated list of arguments< / span > < span class = "named-paragraph-number" > 2.2< / 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 = "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" > return_kind< / span > < span class = "plain-syntax" > ))< / span >
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< span class = "plain-syntax" > < / span > < a href = "3-sf.html#SP21" class = "function-link" > < span class = "function-syntax" > Frames::emit_new_local_value< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > return_kind< / 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" > k< / span > < span class = "plain-syntax" > =0; < / span > < span class = "identifier-syntax" > k< / span > < span class = "function-syntax" > < tokens-> < / span > < span class = "element-syntax" > tokens_count< / 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-cv.html#SP5" class = "function-link" > < span class = "function-syntax" > CompileValues::to_fresh_code_val_of_kind< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > tokens< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > token_vals< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > k< / span > < span class = "plain-syntax" > ], < / span > < span class = "identifier-syntax" > tokens< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > token_kinds< / 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 > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > phrase_options< / span > < span class = "plain-syntax" > != -1)< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > EmitCode::val_number< / span > < span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > inter_ti< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > phrase_options< / 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 = "5-ciac.html#SP2" > § 2< / a > , < a href = "5-ciac.html#SP3" > § 3< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. < / b > The indirect version of the function is used when a function whose address
is not known at compile time must be called; this is needed in a few inline
invocations.
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > CallingFunctions::indirect_function_call< / 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" > CallingFunctions::indirect_function_call< / span > < / span > :< br / > Compile Invocations Inline - < a href = "5-cii.html#SP6_7_1" > § 6.7.1< / a > , < a href = "5-cii.html#SP6_7_2" > § 6.7.2< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > tokens_packet< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > tokens< / span > < span class = "plain-syntax" > ,< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > indirect_spec< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > lookup_flag< / 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" > return_kind< / 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 = "named-paragraph-container code-font" > < a href = "5-ciac.html#SP2_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Compute the return kind of the phrase< / span > < span class = "named-paragraph-number" > 2.1< / span > < / a > < / 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" > arity< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > tokens< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > tokens_count< / 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" > return_kind< / span > < span class = "plain-syntax" > )) < / span > < span class = "identifier-syntax" > arity< / span > < span class = "plain-syntax" > ++;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_ti< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > BIP< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Primitives::BIP_for_indirect_call_returning_value< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > arity< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > EmitCode::inv< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > BIP< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > EmitCode::down< / 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" > lookup_flag< / span > < span class = "plain-syntax" > ) {< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > EmitCode::inv< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > LOOKUP_BIP< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > EmitCode::down< / span > < span class = "plain-syntax" > ();< / span >
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< span class = "plain-syntax" > < / span > < a href = "2-cv.html#SP5" class = "function-link" > < span class = "function-syntax" > CompileValues::to_code_val< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > indirect_spec< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > EmitCode::val_number< / span > < span class = "plain-syntax" > (1);< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > EmitCode::up< / 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-cv.html#SP5" class = "function-link" > < span class = "function-syntax" > CompileValues::to_code_val< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > indirect_spec< / 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" > phrase_options< / span > < span class = "plain-syntax" > = -1;< / span >
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< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "5-ciac.html#SP2_2" class = "named-paragraph-link" > < span class = "named-paragraph" > Emit the comma-separated list of arguments< / span > < span class = "named-paragraph-number" > 2.2< / span > < / a > < / span > < span class = "plain-syntax" > ;< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > EmitCode::up< / 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-ci.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-wtmd.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-im.html" > 1< / a > < / li > < li class = "progresschapter" > < a href = "2-cv.html" > 2< / a > < / li > < li class = "progresschapter" > < a href = "3-sf.html" > 3< / a > < / li > < li class = "progresschapter" > < a href = "4-cs.html" > 4< / a > < / li > < li class = "progresscurrentchapter" > 5< / li > < li class = "progresssection" > < a href = "5-cbal.html" > cbal< / a > < / li > < li class = "progresssection" > < a href = "5-ci.html" > ci< / a > < / li > < li class = "progresscurrent" > ciac< / li > < li class = "progresssection" > < a href = "5-cii.html" > cii< / a > < / li > < li class = "progresssection" > < a href = "5-cste.html" > cste< / a > < / li > < li class = "progresssection" > < a href = "5-ca.html" > ca< / a > < / li > < li class = "progressnext" > < a href = "5-cii.html" > ❯ < / a > < / li > < / ul > < / div >
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< / nav > <!-- End of weave -->
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< / main >
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< / body >
< / html >