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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" > imperative< / a > < / li > < li > < a href = "index.html#2" > Chapter 2: Functions< / a > < / li > < li > < b > Local Parking< / b > < / li > < / ul > < / div >
2021-04-02 19:33:37 +03:00
< p class = "purpose" > Like Free Parking in Monopoly, except that it is not free and has an overhead cost.< / p >
< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > This is one of several devices we employ to get around the lack of a call stack
in memory. Suppose we want the local variables in function A to be visible to
function B, which is called from A, and suppose they cannot be passed as call
parameters to B. B cannot access them using pointers to the stack frame for A,
because the call stack does not exist in memory. What to do?
< / p >
< p class = "commentary" > What we do is to stash them into a "local parking" array, make the call to B,
and then in the code for B retrieve them again. A paraphrase might look
like this:
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > void A(void) {< / span >
< span class = "plain-syntax" > int alpha = 2, beta = 3, gamma = 5;< / span >
< span class = "plain-syntax" > lp[0] = alpha;< / span >
< span class = "plain-syntax" > lp[1] = beta;< / span >
< span class = "plain-syntax" > lp[2] = gamma;< / span >
< span class = "plain-syntax" > B();< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > void B(void) {< / span >
< span class = "plain-syntax" > int alpha = lp[0];< / span >
< span class = "plain-syntax" > int beta = lp[1];< / span >
< span class = "plain-syntax" > int gamma = lp[2];< / span >
< span class = "plain-syntax" > ...< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary" > Note that B can now read, but not write, the locals from A. The scratch array
< span class = "extract" > < span class = "extract-syntax" > lp< / span > < / span > used here for storage is meaningless except for immediately before and
after the call to B, so we don't need to worry about multiple uses of local
parking getting in each other's way. We just need < span class = "extract" > < span class = "extract-syntax" > lp< / span > < / span > to be large enough for
the maximum number of cars ever needing to be parked.
< / p >
< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > This compiles the necessary code before the call to B:
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > size_of_local_parking_area< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > LocalParking::park< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > stack_frame< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > frame< / 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" > NC< / 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" > inter_ti< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > j< / 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" > local_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > lvar< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_LOCALS_IN_FRAME< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lvar< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > frame< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NC< / span > < span class = "plain-syntax" > ++;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::inv_primitive< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > SEQUENTIAL_BIP< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::down< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > ());< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::inv_primitive< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > STORE_BIP< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::down< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > ());< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::inv_primitive< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > LOOKUPREF_BIP< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::down< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > ());< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::val_iname< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > K_value< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > Hierarchy::find< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > LOCALPARKING_HL< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::val< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > K_number< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > LITERAL_IVAL< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > ++);< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::up< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / 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" > lvar_s< / span > < span class = "plain-syntax" > = < / span > < a href = "2-lv.html#SP1" class = "function-link" > < span class = "function-syntax" > LocalVariables::declare< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lvar< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::val_symbol< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > K_value< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > lvar_s< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::up< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / 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" > NC< / span > < span class = "plain-syntax" > > < / span > < span class = "identifier-syntax" > size_of_local_parking_area< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > size_of_local_parking_area< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > NC< / 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" > size_of_local_parking_area< / span > < span class = "plain-syntax" > < < / span > < span class = "constant-syntax" > 2< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > size_of_local_parking_area< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 2< / span > < span class = "plain-syntax" > ;< / 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" > NC< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. < / b > And this compiles the retrieval code just after B begins:
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > LocalParking::retrieve< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > stack_frame< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > frame< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_name< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > LP< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Hierarchy::find< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > LOCALPARKING_HL< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > inter_ti< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > =0;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > local_variable< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > lvar< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_OVER_LOCALS_IN_FRAME< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lvar< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > frame< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::inv_primitive< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > STORE_BIP< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::down< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > ());< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::ref_symbol< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > K_value< / span > < span class = "plain-syntax" > , < / span > < a href = "2-lv.html#SP1" class = "function-link" > < span class = "function-syntax" > LocalVariables::declare< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > lvar< / span > < span class = "plain-syntax" > ));< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::inv_primitive< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / 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" > Produce::down< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > ());< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::val_iname< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > K_value< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > LP< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::val< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > K_number< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > LITERAL_IVAL< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > ++);< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::up< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > ());< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Produce::up< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > ());< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP4" class = "paragraph-anchor" > < / a > < b > § 4. < / b > And this makes a suitably-sized car park, if one is needed at all:
< / p >
< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > LocalParking::compile_array< / span > < 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" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > size_of_local_parking_area< / 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" > inter_name< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > iname< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Hierarchy::find< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > LOCALPARKING_HL< / 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" > Emit::named_array_begin< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > iname< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > K_value< / span > < span class = "plain-syntax" > );< / span >
< 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" > size_of_local_parking_area< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++)< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Emit::array_numeric_entry< / span > < span class = "plain-syntax" > (0);< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Emit::array_end< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > save< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Hierarchy::make_available< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Emit::tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > iname< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< nav role = "progress" > < div class = "progresscontainer" >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "2-lv.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 = "progresscurrentchapter" > 2< / li > < li class = "progresssection" > < a href = "2-sf.html" > sf< / a > < / li > < li class = "progresssection" > < a href = "2-lvs.html" > lvs< / a > < / li > < li class = "progresssection" > < a href = "2-lv.html" > lv< / a > < / li > < li class = "progresscurrent" > lp< / li > < li class = "progresssection" > < a href = "2-cb.html" > cb< / a > < / li > < li class = "progresssection" > < a href = "2-fnc.html" > fnc< / a > < / li > < li class = "progresssection" > < a href = "2-pr.html" > pr< / a > < / li > < li class = "progresssection" > < a href = "2-cls.html" > cls< / a > < / li > < li class = "progresssection" > < a href = "2-cid.html" > cid< / a > < / li > < li class = "progresschapter" > < a href = "3-cv.html" > 3< / a > < / li > < li class = "progresschapter" > < a href = "4-cbal.html" > 4< / a > < / li > < li class = "progressnext" > < a href = "2-cb.html" > ❯ < / a > < / li > < / ul > < / div >
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< / nav > <!-- End of weave -->
< / main >
< / body >
< / html >
