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Add initial sketch of PIRT, which is to be a hopefully more memory efficient replacement for POST.
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‎src/QAST/PIRT.nqp

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# PIRT is a very lightweight PIR tree representation. It does very little
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# really, besides being much more pleasant than working with strings directly
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# in QAST::Compiler. Since the mapping is pretty close, the nodes themselves
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# know how to become PIR.
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class PIRT::Node {
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my %op_compilers := nqp::hash(
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'call', sub (@args) {
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nqp::die("NYI");
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},
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'callmethod', sub (@args) {
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nqp::die("NYI");
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},
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'return', sub (@args) {
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" .return (" ~ nqp::join(", ", @args) ~ ")"
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},
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'yield', sub (@args) {
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nqp::die("NYI");
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},
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'tailcall', sub (@args) {
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nqp::die("NYI");
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},
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'inline', sub (@args) {
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nqp::die("NYI");
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});
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method children_pir(@children) {
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my @parts;
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for @children {
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if nqp::islist($_) {
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my $op_name := $_[0];
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my @op_args;
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my $i := 1;
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my $c := nqp::elems($_);
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my $arg;
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while $i < $c {
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$arg := $_[$i];
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if $arg ~~ PIRT::Node {
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nqp::push(@op_args, $arg.result);
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}
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else {
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nqp::push(@op_args, $arg);
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}
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$i := $i + 1;
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}
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if nqp::existskey(%op_compilers, $op_name) {
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nqp::push(@parts, %op_compilers{$op_name}(@op_args));
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}
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else {
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nqp::push(@parts, ' ' ~ $op_name ~ ' ' ~ nqp::join(", ", @op_args));
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}
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}
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elsif $_ ~~ PIRT::Sub {
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nqp::push(@*PIRT_BLOCKS, $_);
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}
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elsif $_ ~~ PIRT::Node {
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my $pir := $_.pir;
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nqp::push(@parts, $pir) unless $pir eq '';
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}
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else {
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nqp::die("Unexpected object in PIRT tree");
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}
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}
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nqp::join("\n", @parts)
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}
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}
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class PIRT::Sub is PIRT::Node {
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has @!children;
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has @!nested_blocks;
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has str $!cached_pir;
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method new() {
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my $obj := nqp::create(self);
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nqp::bindattr($obj, PIRT::Sub, '@!children', nqp::list());
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$obj
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}
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method push($node) {
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nqp::push(@!children, $node);
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}
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method push_pirop(*@opbits) {
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nqp::push(@!children, @opbits)
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}
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method result() {
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nqp::die("Cannot use a PIRT::Sub in a context expecting a result");
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}
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method close_sub() {
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my @parts;
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# Sub prelude.
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nqp::push(@parts, ".sub ''");
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# Compile sub contents, collecting any nested blocks.
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my @*PIRT_BLOCKS;
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nqp::push(@parts, self.children_pir(@!children));
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# Sub postlude.
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nqp::push(@parts, ".end");
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# Store the compiled PIR and collected inner blocks. Also, null out
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# the children array, to free up memory.
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$!cached_pir := nqp::join("\n", @parts);
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@!nested_blocks := @*PIRT_BLOCKS;
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}
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method pir() {
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# If we don't already have the sub body, then close the sub now.
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unless $!cached_pir {
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self.close_sub();
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}
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# Our PIR is ourselve plus the PIR of any nested blocks.
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my @parts := [$!cached_pir];
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for @!nested_blocks {
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nqp::push(@parts, $_.pir());
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}
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nqp::join("\n", @parts)
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}
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}
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class PIRT::Ops is PIRT::Node {
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has @!children;
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has str $!result;
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method new(:$result = '') {
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my $obj := nqp::create(self);
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nqp::bindattr($obj, PIRT::Ops, '@!children', nqp::list());
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nqp::bindattr_s($obj, PIRT::Ops, '$!result',
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$result ~~ PIRT::Node ?? $result.result !! $result);
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$obj
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}
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method push($node) {
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nqp::push(@!children, $node)
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}
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method push_pirop(*@opbits) {
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nqp::push(@!children, @opbits)
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}
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method result(*@value) {
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if @value {
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$!result := @value[0] ~~ PIRT::Node ?? @value[0].result !! @value[0];
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}
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else {
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$!result
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}
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}
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method pir() {
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self.children_pir(@!children)
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}
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}
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class PIRT::Label is PIRT::Node {
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has str $!name;
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method new(:$name!) {
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my $obj := nqp::create(self);
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nqp::bindattr_s($obj, PIRT::Label, '$!name', $name);
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$obj
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}
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method name(*@value) {
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@value ?? ($!name := @value[0]) !! $!name
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}
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method result() {
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$!name
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}
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method pir() {
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' ' ~ $!name ~ ':'
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}
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}

‎t/qast/pirt.t

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use QAST;
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plan(3);
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sub is_pirt_result($producer, $expected, $desc) {
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my $pirt := $producer();
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my $pir := $pirt.pir();
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#say($pir);
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my $pbc := QAST::Compiler.evalpmc($pir);
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ok($pbc() eq $expected, $desc);
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}
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is_pirt_result({
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my $ops := PIRT::Ops.new();
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$ops.push_pirop('return', '"lol"');
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my $sub := PIRT::Sub.new();
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$sub.push($ops);
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$sub
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},
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"lol",
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"simple sub that returns a literal string");
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is_pirt_result({
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my $ops1 := PIRT::Ops.new(:result('"omg"'));
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my $ops2 := PIRT::Ops.new();
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$ops2.push($ops1);
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$ops2.push_pirop('set', '$S0', $ops1);
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$ops2.push_pirop('return', '$S0');
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my $sub := PIRT::Sub.new();
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$sub.push($ops2);
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$sub
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},
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"omg",
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"using Ops nodes inside Ops nodes");
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is_pirt_result({
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my $label := PIRT::Label.new(:name('lbl'));
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my $ops := PIRT::Ops.new();
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$ops.push_pirop('goto', $label);
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$ops.push_pirop('return', '"OOPS"');
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$ops.push($label);
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$ops.push_pirop('return', '"c\'est l\'awesome"');
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my $sub := PIRT::Sub.new();
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$sub.push($ops);
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$sub
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},
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"c'est l'awesome",
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"Basic use of labels");

‎tools/build/Makefile.in

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@@ -69,6 +69,7 @@ QAST_COMBINED = QAST.nqp
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QAST_PIR = QAST.pir
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QAST_PBC = QAST.pbc
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QAST_SOURCES = \
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src/QAST/PIRT.nqp \
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src/QAST/CompileTimeValue.nqp \
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src/QAST/SpecialArg.nqp \
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src/QAST/Node.nqp \

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