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code.rakumod
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code.rakumod
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# A blockoid represents the block part of some kind of code declaration.
class RakuAST::Blockoid
is RakuAST::SinkPropagator
{
has RakuAST::StatementList $.statement-list;
method new(RakuAST::StatementList $statement-list?) {
my $obj := nqp::create(self);
nqp::bindattr($obj, RakuAST::Blockoid, '$!statement-list',
$statement-list // RakuAST::StatementList.new);
$obj
}
method propagate-sink(Bool $is-sunk) {
$!statement-list.propagate-sink($is-sunk, :has-block-parent(True))
}
method IMPL-TO-QAST(RakuAST::IMPL::QASTContext $context, :$immediate) {
my $stmts := $!statement-list.IMPL-TO-QAST($context);
if nqp::elems($stmts.list) == 0 {
$stmts.push(QAST::WVal.new( :value(Nil) ));
}
$stmts
}
method visit-children(Code $visitor) {
$visitor($!statement-list);
}
method IMPL-CAN-INTERPRET() {
$!statement-list.IMPL-CAN-INTERPRET
}
method IMPL-INTERPRET(RakuAST::IMPL::InterpContext $ctx) {
$!statement-list.IMPL-INTERPRET($ctx)
}
}
class RakuAST::OnlyStar
is RakuAST::Blockoid
is RakuAST::Term
{
method new() {
my $obj := nqp::create(self);
nqp::bindattr($obj, RakuAST::Blockoid, '$!statement-list',
RakuAST::StatementList.new);
$obj
}
method IMPL-TO-QAST(RakuAST::IMPL::QASTContext $context, :$immediate) {
QAST::Op.new(
:op('dispatch'),
QAST::SVal.new( :value('boot-resume') ),
QAST::IVal.new( :value(nqp::const::DISP_ONLYSTAR) ));
}
}
# Marker for all code-y things.
class RakuAST::Code
is RakuAST::Attaching
{
has Bool $.custom-args;
has Mu $!qast-block;
has str $!cuid;
# Only for use by the fallback resolver in dynamically compiled code!
has RakuAST::Resolver $!resolver;
method attach(RakuAST::Resolver $resolver) {
nqp::bindattr(self, RakuAST::Code, '$!resolver', $resolver.clone);
}
method set-custom-args() {
nqp::bindattr(self, RakuAST::Code, '$!custom-args', True);
}
method IMPL-CLOSURE-QAST(RakuAST::IMPL::QASTContext $context, Bool :$regex) {
my $code-obj := self.meta-object;
$context.ensure-sc($code-obj);
my $clone := QAST::Op.new(
:op('callmethod'), :name('clone'),
QAST::WVal.new( :value($code-obj) )
);
self.IMPL-TWEAK-REGEX-CLONE($context, $clone) if $regex;
QAST::Op.new( :op('p6capturelex'), $clone )
}
method IMPL-QAST-BLOCK(RakuAST::IMPL::QASTContext $context, str :$blocktype,
RakuAST::Expression :$expression) {
unless ($!qast-block) {
self.IMPL-FINISH-CODE-OBJECT($context, :$blocktype, :$expression);
}
$!qast-block
}
method IMPL-FINISH-CODE-OBJECT(RakuAST::IMPL::QASTContext $context, str :$blocktype,
RakuAST::Expression :$expression) {
my $block := self.IMPL-QAST-FORM-BLOCK($context, :$blocktype, :$expression);
self.IMPL-LINK-META-OBJECT($context, $block);
nqp::bindattr(self, RakuAST::Code, '$!qast-block', $block);
}
method IMPL-STUB-CODE(RakuAST::Resolver $resolver, RakuAST::IMPL::QASTContext $context) {
# Not all objects of certain subclasses will be attached properly,
# so get that resolver here
nqp::bindattr(self, RakuAST::Code, '$!resolver', $resolver.clone)
unless $!resolver;
my $code-obj := self.meta-object;
nqp::bindattr_s(self, RakuAST::Code, '$!cuid', QAST::Block.next-cuid());
# Stash it under the QAST block unique ID.
my str $cuid := $!cuid;
$context.sub-id-to-code-object(){$cuid} := $code-obj;
my $precomp;
my $stub := nqp::freshcoderef(sub (*@pos, *%named) {
my $code-obj := nqp::getcodeobj(nqp::curcode());
unless $precomp {
my $block := self.IMPL-QAST-BLOCK($context, :blocktype<declaration_static>);
$precomp := self.IMPL-COMPILE-DYNAMICALLY($resolver, $context, $block);
}
unless nqp::isnull($code-obj) {
return $code-obj(|@pos, |%named);
}
});
nqp::bindattr($code-obj, Code, '$!do', $stub);
nqp::markcodestatic($stub);
nqp::markcodestub($stub);
nqp::setcodeobj($stub, $code-obj);
# Create the compiler stuff array and stick it in the code object.
# Also add clearup task to remove it again later.
my @compstuff;
nqp::bindattr($code-obj, Code, '@!compstuff', @compstuff);
$context.add-cleanup-task(sub () {
nqp::bindattr($code-obj, Code, '@!compstuff', nqp::null());
nqp::bindattr(self, RakuAST::Code, '$!resolver', RakuAST::Resolver) if $context.is-precompilation-mode;
});
@compstuff[2] := sub ($orig, $clone) {
my $do := nqp::getattr($clone, Code, '$!do');
nqp::markcodestub($do);
$context.add-cleanup-task(sub () {
nqp::bindattr($clone, Code, '@!compstuff', nqp::null());
});
$context.add-clone-for-cuid($clone, $cuid);
}
$stub
}
method IMPL-LINK-META-OBJECT(RakuAST::IMPL::QASTContext $context, Mu $block) {
# Obtain the meta-object and connect it to the code block.
my $code-obj := self.meta-object;
$context.ensure-sc($code-obj);
# Associate QAST block with code object, which will ensure it is
# fixed up as needed.
$block.code_object($code-obj);
my @compstuff := nqp::getattr($code-obj, Code, '@!compstuff');
my $cuid := $!cuid;
$block.set-cuid($!cuid);
my $fixups := QAST::Stmts.new();
unless $context.is-precompilation-mode || $context.is-nested {
# We need to do a fixup of the code block for the non-precompiled case.
$fixups.push(
QAST::Op.new(
:op('bindattr'),
QAST::WVal.new( :value($code-obj) ),
QAST::WVal.new( :value(Code) ),
QAST::SVal.new( :value('$!do') ),
QAST::BVal.new( :value($block) )
)
);
@compstuff[2] := sub ($orig, $clone) {
$context.ensure-sc($clone);
$context.add-cleanup-task(sub () {
nqp::bindattr($clone, Code, '@!compstuff', nqp::null());
});
$context.add-clone-for-cuid($clone, $cuid);
my $tmp := $fixups.unique('tmp_block_fixup');
$fixups.push(QAST::Stmt.new(
QAST::Op.new(
:op('bind'),
QAST::Var.new( :name($tmp), :scope('local'), :decl('var') ),
QAST::Op.new( :op('clone'), QAST::BVal.new( :value($block) ) )
),
QAST::Op.new(
:op('bind'),
QAST::Var.new(
:name('$!do'), :scope('attribute'),
QAST::WVal.new( :value($clone) ),
QAST::WVal.new( :value(Code) )
),
QAST::Var.new( :name($tmp), :scope('local') ),
),
QAST::Op.new(
:op('setcodeobj'),
QAST::Var.new( :name($tmp), :scope('local') ),
QAST::WVal.new( :value($clone) )
)));
}
@compstuff[3] := $fixups;
}
@compstuff[0] := $block;
$context.add-code-ref(nqp::getattr($code-obj, Code, '$!do'), $block);
$context.add-fixup-task(-> {
$fixups
});
}
method IMPL-COMPILE-DYNAMICALLY(RakuAST::Resolver $resolver, RakuAST::IMPL::QASTContext $context, Mu $block) {
my $wrapper := QAST::Block.new(QAST::Stmts.new(), $block);
$wrapper.annotate('DYN_COMP_WRAPPER', 1);
my $compunit := QAST::CompUnit.new(
:hll('Raku'),
:sc($context.sc()),
:compilation_mode(0),
$wrapper
);
my $comp := $*HLL-COMPILER // nqp::getcomp("Raku");
my $precomp := $comp.compile($compunit, :from<qast>, :compunit_ok(1));
{
my $resolver := $!resolver;
#?if !jvm
nqp::dispatch(
'boot-syscall',
'set-compunit-resolver',
$precomp,
-> $name {
my $result := $resolver.resolve-lexical($name);
if $result {
nqp::istype($result, RakuAST::CompileTimeValue)
?? $result.compile-time-value
!! Mu
}
else {
nqp::die("No lexical found with name $name via resolver");
}
},
-> $dyn-name {
my $dynamic-fallback := $resolver.resolve-lexical-in-outer('&DYNAMIC-FALLBACK');
my $without-star := nqp::replace($dyn-name, 1, 1, '');
$dynamic-fallback.compile-time-value()($dyn-name, $without-star)
}
);
}
#?endif
my $mainline := $comp.backend.compunit_mainline($precomp);
$mainline();
# Fix up Code object associations (including nested blocks).
# We un-stub any code objects for already-compiled inner blocks
# to avoid wasting re-compiling them, and also to help make
# parametric role outer chain work out. Also set up their static
# lexpads, if they have any.
my @coderefs := $comp.backend.compunit_coderefs($precomp);
my int $num-subs := nqp::elems(@coderefs);
my int $i := -1;
my $result;
while ++$i < $num-subs {
my $subid := nqp::getcodecuid(@coderefs[$i]);
# un-stub code objects for blocks we just compiled:
my %sub-id-to-code-object := $context.sub-id-to-code-object();
if nqp::existskey(%sub-id-to-code-object, $subid) {
my $code-obj := %sub-id-to-code-object{$subid};
nqp::setcodeobj(@coderefs[$i], $code-obj);
nqp::bindattr($code-obj, Code, '$!do', @coderefs[$i]);
my $fixups := nqp::getattr($code-obj, Code, '@!compstuff')[3];
if $fixups {
$fixups.pop() while $fixups.list;
}
nqp::bindattr($code-obj, Code, '@!compstuff', nqp::null());
}
# un-stub clones of code objects for blocks we just compiled:
my %sub-id-to-cloned-code-objects := $context.sub-id-to-cloned-code-objects();
if nqp::existskey(%sub-id-to-cloned-code-objects, $subid) {
for %sub-id-to-cloned-code-objects{$subid} -> $code-obj {
my $clone := nqp::clone(@coderefs[$i]);
nqp::setcodeobj($clone, $code-obj);
nqp::bindattr($code-obj, Code, '$!do', $clone);
my $fixups := nqp::getattr($code-obj, Code, '@!compstuff')[3];
if $fixups {
$fixups.pop() while $fixups.list;
}
nqp::bindattr($code-obj, Code, '@!compstuff', nqp::null());
}
}
my %sub-id-to-sc-idx := $context.sub-id-to-sc-idx();
if nqp::existskey(%sub-id-to-sc-idx, $subid) {
nqp::markcodestatic(@coderefs[$i]);
nqp::scsetcode($context.sc, %sub-id-to-sc-idx{$subid}, @coderefs[$i]);
}
if $subid eq $block.cuid {
# Remember the VM coderef that maps to the thing we were originally
# asked to compile.
$result := @coderefs[$i];
}
}
$result
}
method IMPL-APPEND-SIGNATURE-RETURN(RakuAST::IMPL::QASTContext $context, Mu $qast-stmts) {
my $signature := self.signature;
if $signature && $signature.provides-return-value {
$qast-stmts.push($signature.returns.IMPL-TO-QAST($context));
}
$qast-stmts
}
method needs-sink-call() { False }
method signature() { Nil }
}
# The base of all expression thunks, which produce a code object of some kind
# that wraps the thunk.
class RakuAST::ExpressionThunk
is RakuAST::Code
is RakuAST::Meta
is RakuAST::BeginTime
{
has RakuAST::ExpressionThunk $.next;
has RakuAST::Signature $!signature;
method set-next(RakuAST::ExpressionThunk $next) {
nqp::bindattr(self, RakuAST::ExpressionThunk, '$!next', $next);
Nil
}
method thunk-kind() {
self.HOW.name(self)
}
method PERFORM-BEGIN(RakuAST::Resolver $resolver, RakuAST::IMPL::QASTContext $context) {
self.IMPL-STUB-CODE($resolver, $context);
Nil
}
# Called to produce the QAST::Block for the thunk, which should be pushed
# into the passed `$target`. If there is a next thunk in `$!next` then it
# should be compiled recursively and the expression passed along; otherwise,
# the expression itself should be compiled and used as the body.
method IMPL-THUNK-CODE-QAST(RakuAST::IMPL::QASTContext $context, Mu $target,
RakuAST::Expression $expression) {
my $block := self.IMPL-QAST-BLOCK($context, :$expression);
# Link and push the produced code block.
$target.push($block);
}
method IMPL-QAST-FORM-BLOCK(RakuAST::IMPL::QASTContext $context,
str :$blocktype, RakuAST::Expression :$expression!) {
# From the block, compiling the signature.
my $signature := self.IMPL-GET-OR-PRODUCE-SIGNATURE;
my $block :=
self.IMPL-SET-NODE(
QAST::Block.new(
:blocktype('declaration_static'),
QAST::Stmts.new( $signature.IMPL-QAST-BINDINGS($context) )),
:key);
my $stmts := QAST::Stmts.new();
for self.IMPL-UNWRAP-LIST($signature.parameters) {
$stmts.push($_.target.IMPL-QAST-DECL($context)) unless $_.target.lexical-name eq '$_';
}
if nqp::istype(self, RakuAST::ImplicitDeclarations) {
for self.IMPL-UNWRAP-LIST(self.get-implicit-declarations()) -> $decl {
if $decl.is-simple-lexical-declaration {
nqp::push($stmts, $decl.IMPL-QAST-DECL($context));
}
}
}
# Add blocks embedded in the thunked expression children of the thunk
# block, so they can access the thunk argument.
my @code-todo := [$expression];
while @code-todo {
my $visit := @code-todo.shift;
$visit.visit-children: -> $node {
if nqp::istype($node, RakuAST::Code) {
if $visit =:= $expression
|| !(nqp::istype($visit, RakuAST::IMPL::ImmediateBlockUser) &&
$visit.IMPL-IMMEDIATELY-USES($node))
{
$stmts.push($node.IMPL-QAST-DECL-CODE($context));
}
}
unless nqp::istype($node, RakuAST::LexicalScope) {
@code-todo.push($node);
}
}
}
$block.push($stmts) if $stmts.list;
$block.arity($signature.arity);
# If there's an inner thunk the body evaluates to that.
if $!next {
$!next.IMPL-THUNK-CODE-QAST($context, $block[0], $expression);
my $value := $!next.IMPL-THUNK-VALUE-QAST($context);
$block.push($value) if $value;
}
# Otherwise, we evaluate to the expression.
else {
$block.push(self.IMPL-THUNK-TWEAK-EXPRESSION($context,
$expression.IMPL-EXPR-QAST($context)));
}
$block
}
# Produces a Code object that corresponds to the thunk.
method IMPL-THUNK-VALUE-QAST(RakuAST::IMPL::QASTContext $context) {
self.IMPL-CLOSURE-QAST($context)
}
# The type of code object produced. Defaults to Code; override to produce
# something else.
method IMPL-THUNK-OBJECT-TYPE() { Code }
# The signature for the code object produced. Defaults to the empty
# signature; override to produce something else
method IMPL-THUNK-SIGNATURE() {
RakuAST::Signature.new
}
# A method to tweak the expression QAST that is produced. Override it
# to do such a tweak.
method IMPL-THUNK-TWEAK-EXPRESSION(RakuAST::IMPL::QASTContext $context, Mu $qast) {
$qast
}
# A callback for when the thunk meta-object is produced, potentially to
# update some other meta-object that wants to reference it.
method IMPL-THUNK-META-OBJECT-PRODUCED(Mu $meta) {
}
method IMPL-GET-OR-PRODUCE-SIGNATURE() {
$!signature // nqp::bindattr(self, RakuAST::ExpressionThunk, '$!signature',
self.IMPL-THUNK-SIGNATURE)
}
method PRODUCE-META-OBJECT() {
my $code := nqp::create(self.IMPL-THUNK-OBJECT-TYPE);
my $signature := self.IMPL-GET-OR-PRODUCE-SIGNATURE;
nqp::bindattr($code, Code, '$!signature', $signature.meta-object);
nqp::bindattr($signature.meta-object, Signature, '$!code', $code);
self.IMPL-THUNK-META-OBJECT-PRODUCED($code);
$code
}
method IMPL-UPDATE-SIGNATURE() {
return Nil unless self.has-meta-object;
my $code := self.meta-object;
nqp::bindattr(self, RakuAST::ExpressionThunk, '$!signature', self.IMPL-THUNK-SIGNATURE);
my $signature := $!signature;
nqp::bindattr($code, Code, '$!signature', $signature.meta-object);
nqp::bindattr($signature.meta-object, Signature, '$!code', $code);
self.IMPL-THUNK-META-OBJECT-PRODUCED($code);
}
}
# A code object that can have placeholder parameters.
class RakuAST::PlaceholderParameterOwner
is RakuAST::Node
{
# Any placeholder parameters that have been attached
has Mu $!attached-placeholder-parameters;
# A map grouping placeholder parameters by name, for error checking and
# compilation.
has Mu $!placeholder-map;
# Cached generated placeholder signature.
has RakuAST::Signature $!placeholder-signature;
method add-placeholder-parameter(RakuAST::VarDeclaration::Placeholder $placeholder) {
unless nqp::islist($!attached-placeholder-parameters) {
nqp::bindattr(self, RakuAST::PlaceholderParameterOwner,
'$!attached-placeholder-parameters', []);
}
my $name := $placeholder.lexical-name;
if self.IMPL-HAS-PARAMETER($name) {
# matches an explicitly declared parameter
$placeholder.IMPL-ALREADY-DECLARED(True);
}
else {
for $!attached-placeholder-parameters {
if $_.lexical-name eq $name {
# same placeholder is used multiple times
$placeholder.IMPL-ALREADY-DECLARED(True);
return Nil
}
}
nqp::push($!attached-placeholder-parameters, $placeholder);
}
Nil
}
method clear-placeholder-attachments() {
if nqp::islist($!attached-placeholder-parameters) {
for $!attached-placeholder-parameters {
# reset declared state on parameters,
# will be re-set when they are attached again
$_.IMPL-ALREADY-DECLARED(False);
}
nqp::bindattr(self, RakuAST::PlaceholderParameterOwner,
'$!attached-placeholder-parameters', nqp::null());
}
Nil
}
method has-placeholder-parameters() {
my $params := $!attached-placeholder-parameters;
nqp::islist($params) && nqp::elems($params) ?? True !! False
}
method IMPL-HAS-PARAMETER(Str $name) {
False
}
method IMPL-PLACEHOLDER-MAP() {
unless nqp::ishash($!placeholder-map) {
my %map;
if self.has-placeholder-parameters {
for $!attached-placeholder-parameters -> $param {
my str $key := $param.lexical-name;
(%map{$key} || (%map{$key} := [])).push($param);
}
}
nqp::bindattr(self, RakuAST::PlaceholderParameterOwner,
'$!placeholder-map', %map);
}
$!placeholder-map
}
# Gets the placeholder signature. Only reliable after resolution has taken
# place.
method placeholder-signature() {
# Return Nil if there isn't one to generate, or the cached one if we have
# it.
return Nil unless self.has-placeholder-parameters();
return $!placeholder-signature if $!placeholder-signature;
# Group and sort parameters.
my @positionals;
my @nameds;
my @slurpies;
for self.IMPL-PLACEHOLDER-MAP() {
my $placeholder := $_.value[0];
if nqp::istype($placeholder, RakuAST::VarDeclaration::Placeholder::Positional) {
my int $insert-at := 0;
my str $desigil-insert := nqp::substr($placeholder.lexical-name, 1);
while $insert-at < nqp::elems(@positionals) {
my str $desigil-cur := nqp::substr(@positionals[$insert-at].lexical-name, 1);
last if $desigil-insert lt $desigil-cur;
$insert-at++;
}
nqp::splice(@positionals, [$placeholder], $insert-at, 0);
}
elsif nqp::istype($placeholder, RakuAST::VarDeclaration::Placeholder::Named) {
my int $insert-at := 0;
my str $desigil-insert := nqp::substr($placeholder.lexical-name, 1);
while $insert-at < nqp::elems(@nameds) {
my str $desigil-cur := nqp::substr(@nameds[$insert-at].lexical-name, 1);
last if $desigil-insert lt $desigil-cur;
$insert-at++;
}
nqp::splice(@nameds, [$placeholder], $insert-at, 0);
}
else {
if $placeholder.lexical-name eq '@_' { # @_ before %_
@slurpies.unshift($placeholder);
}
else {
@slurpies.push($placeholder);
}
}
}
# Add to signature.
my @parameters;
for @positionals, @nameds, @slurpies -> @placeholders {
for @placeholders {
@parameters.push($_.generate-parameter());
}
}
my $signature := RakuAST::Signature.new(:@parameters);
nqp::bindattr(self, RakuAST::PlaceholderParameterOwner,
'$!placeholder-signature', $signature);
$signature
}
}
class RakuAST::ScopePhaser {
has Bool $!has-exit-handler;
has List $!ENTER;
has List $!LEAVE;
has List $!KEEP;
has List $!UNDO;
has List $!FIRST;
has List $!NEXT;
has List $!LAST;
has List $!PRE;
has List $!POST;
has List $!QUIT;
has List $!CLOSE;
has RakuAST::Block $!let;
has RakuAST::Block $!temp;
has int $!next-enter-phaser-result;
method add-phaser(
Str $name,
RakuAST::StatementPrefix::Phaser $phaser,
:$has-exit-handler
) {
my $attr := '$!' ~ $name;
my $list := nqp::getattr(self, RakuAST::ScopePhaser, $attr);
$list := nqp::bindattr(self, RakuAST::ScopePhaser, $attr, [])
unless $list;
for $list {
if nqp::eqaddr($_, $phaser) {
return;
}
}
nqp::push($list, $phaser);
nqp::bindattr(self, RakuAST::ScopePhaser, '$!has-exit-handler', True)
if $has-exit-handler;
}
method add-enter-phaser(RakuAST::StatementPrefix::Phaser $phaser) {
self.add-phaser('ENTER', $phaser);
my $result-name := '__enter_phaser_result_' ~ $!next-enter-phaser-result;
nqp::bindattr_i(self, RakuAST::ScopePhaser, '$!next-enter-phaser-result', $!next-enter-phaser-result + 1);
$result-name
}
method set-has-let() {
nqp::bindattr(self, RakuAST::ScopePhaser, '$!let', RakuAST::Block.new(:implicit-topic(False)));
}
method set-has-temp() {
nqp::bindattr(self, RakuAST::ScopePhaser, '$!has-exit-handler', True);
nqp::bindattr(self, RakuAST::ScopePhaser, '$!temp', RakuAST::Block.new(:implicit-topic(False)));
}
method add-list-to-code-object(Str $attr, $code-object) {
my $list := nqp::getattr(self, RakuAST::ScopePhaser, $attr);
if $list {
my $name := nqp::substr($attr,2); # $!FOO -> FOO
for $list {
$code-object.add_phaser($name, $_.meta-object);
}
}
}
method add-phasers-to-code-object($code-object) {
self.add-list-to-code-object('$!ENTER', $code-object);
self.add-list-to-code-object('$!LEAVE', $code-object);
self.add-list-to-code-object( '$!KEEP', $code-object);
self.add-list-to-code-object( '$!UNDO', $code-object);
self.add-list-to-code-object('$!FIRST', $code-object);
self.add-list-to-code-object( '$!NEXT', $code-object);
self.add-list-to-code-object( '$!LAST', $code-object);
self.add-list-to-code-object( '$!QUIT', $code-object);
self.add-list-to-code-object( '$!PRE', $code-object);
self.add-list-to-code-object( '$!POST', $code-object);
self.add-list-to-code-object('$!CLOSE', $code-object);
if $!let {
$code-object.add_phaser('UNDO', $!let.meta-object);
}
if $!temp {
$code-object.add_phaser('LEAVE', $!temp.meta-object);
}
$code-object.fatalize if $*LANG && $*LANG.pragma('fatal');
}
method add-phasers-handling-code(RakuAST::IMPL::Context $context, Mu $qast) {
if $!has-exit-handler {
$qast.has_exit_handler(1);
}
if $!PRE {
my $pre-setup := QAST::Stmts.new;
for $!PRE {
$pre-setup.push($_.IMPL-CALLISH-QAST($context));
}
$qast[0].push(QAST::Op.new( :op('p6setpre') ));
$qast[0].push($pre-setup);
$qast[0].push(QAST::Op.new( :op('p6clearpre') ));
}
if $!FIRST {
my $first-setup := QAST::Stmts.new;
for $!FIRST {
$first-setup.push($_.IMPL-CALLISH-QAST($context));
}
$qast[0].push(
QAST::Op.new(
:op('if'),
QAST::Op.new( :op('p6takefirstflag') ),
$first-setup
)
);
}
my $phasers := nqp::istype(self, RakuAST::Code)
?? nqp::getattr(self.meta-object, Block, '$!phasers')
!! NQPMu;
if $!ENTER || nqp::ishash($phasers) && nqp::existskey($phasers, 'ENTER') {
my $enter-setup := QAST::Stmts.new;
my %seen;
if $!ENTER {
for $!ENTER {
my $result-name := $_.IMPL-RESULT-NAME;
$enter-setup.push(
QAST::Op.new(
:op<bind>,
QAST::Var.new( :name($result-name), :scope<local>, :decl<var> ),
$_.IMPL-CALLISH-QAST($context)
)
);
%seen{nqp::objectid($_.meta-object)} := 1;
}
}
my $enter-phasers := nqp::atkey($phasers, 'ENTER');
if nqp::isconcrete($enter-phasers) {
for $enter-phasers {
unless %seen{nqp::objectid($_)} {
$context.ensure-sc($_);
$enter-setup.push(QAST::Op.new(:op<call>, QAST::WVal.new(:value($_))));
}
}
}
$qast[0].push($enter-setup);
}
if $!let {
self.IMPL-ADD-PHASER-QAST($context, $!let, '!LET-RESTORE', $qast);
}
if $!temp {
self.IMPL-ADD-PHASER-QAST($context, $!temp, '!TEMP-RESTORE', $qast);
}
if $!LAST || $!NEXT || $!QUIT || $!CLOSE {
$qast[0].push(
QAST::Op.new(
:op('callmethod'),
:name('!capture_phasers'),
QAST::Op.new(
:op('getcodeobj'),
QAST::Op.new(:op('curcode'))
)
)
);
}
if $!LEAVE || $!KEEP || $!UNDO || $!POST {
$qast.annotate('WANTMEPLEASE',1);
}
}
method IMPL-STUB-PHASERS(RakuAST::Resolver $resolver, RakuAST::IMPL::Context $context) {
if $!let {
$!let.IMPL-CHECK($resolver, $context, False);
$!let.IMPL-STUB-CODE($resolver, $context);
}
if $!temp {
$!temp.IMPL-CHECK($resolver, $context, False);
$!temp.IMPL-STUB-CODE($resolver, $context);
}
}
method IMPL-ADD-PHASER-QAST(
RakuAST::IMPL::Context $context,
RakuAST::Block $phaser,
Str $value_stash,
QAST::Block $block
) {
$block[0].push(QAST::Op.new(
:op('bind'),
QAST::Var.new( :name($value_stash), :scope('lexical'), :decl('var') ),
QAST::Op.new(
:op('create'),
QAST::WVal.new( :value(IterationBuffer)))));
$block.symbol($value_stash, :scope('lexical'));
my $phaser-block := $phaser.IMPL-QAST-BLOCK($context, :blocktype('declaration_static'));
$phaser-block.push(QAST::Op.new(
:op('while'),
QAST::Op.new(
:op('elems'),
QAST::Var.new( :name($value_stash), :scope('lexical') )),
QAST::Op.new(
:op('if'),
QAST::Op.new(
:op('iscont'),
QAST::Op.new(
:op('atpos'),
QAST::Var.new( :name($value_stash), :scope('lexical') ),
QAST::IVal.new( :value(0) ))),
QAST::Op.new( # p6store is for Scalar
:op('p6store'),
QAST::Op.new(
:op('shift'),
QAST::Var.new( :name($value_stash), :scope('lexical') )),
QAST::Op.new(
:op('shift'),
QAST::Var.new( :name($value_stash), :scope('lexical') ))),
QAST::Op.new( # Otherwise we restore by means of the container itself
:op('callmethod'),
:name('TEMP-LET-RESTORE'),
QAST::Op.new(
:op('shift'),
QAST::Var.new( :name($value_stash), :scope('lexical') )),
QAST::Op.new(
:op('shift'),
QAST::Var.new( :name($value_stash), :scope('lexical') ))))));
# Add as phaser.
$block[0].push($phaser-block);
}
method clear-phaser-attachments() {
my @attrs := ['$!LEAVE', '$!FIRST', '$!NEXT', '$!LAST'];
for @attrs {
my $attr := nqp::getattr(self, RakuAST::ScopePhaser, $_);
nqp::setelems($attr, 0) if $attr;
}
}
}
# A block, either without signature or with only a placeholder signature.
class RakuAST::Block
is RakuAST::LexicalScope
is RakuAST::Term
is RakuAST::Code
is RakuAST::Meta
is RakuAST::BlockStatementSensitive
is RakuAST::SinkPropagator
is RakuAST::Blorst
is RakuAST::ImplicitDeclarations
is RakuAST::AttachTarget
is RakuAST::PlaceholderParameterOwner
is RakuAST::BeginTime
is RakuAST::ScopePhaser
is RakuAST::Doc::DeclaratorTarget
{
has RakuAST::Blockoid $.body;
# Should this block have an implicit topic, in the absence of a (perhaps
# placeholder) signature?
# 0 = no implicit topic
# 1 = optional implicit topic
# 2 = required implicit topic
# 3 = required implicit topic populated from exception
has int $!implicit-topic-mode;
# Should this block declare a fresh implicit `$/`?
has int $!fresh-match;
# Should this block declare a fresh implicit `$!`?
has int $!fresh-exception;
method new(RakuAST::Blockoid :$body,
Bool :$implicit-topic,
Bool :$required-topic,
Bool :$exception,
RakuAST::Doc::Declarator :$WHY
) {
my $obj := nqp::create(self);
nqp::bindattr($obj, RakuAST::Block, '$!body', $body // RakuAST::Blockoid.new);
$obj.set-implicit-topic($implicit-topic // 1, :required($required-topic), :$exception);
$obj.set-WHY($WHY);
$obj
}
method replace-body(RakuAST::Blockoid $new-body) {
nqp::bindattr(self, RakuAST::Block, '$!body', $new-body);
Nil
}
method set-implicit-topic(Bool $implicit, Bool :$required, Bool :$exception, Bool :$local) {
nqp::bindattr_i(self, RakuAST::Block, '$!implicit-topic-mode', $implicit
?? ($exception ?? 3 !!
$required ?? 2 !!
1)
!! $local ?? -1 !! 0);
Nil
}
method implicit-topic() { $!implicit-topic-mode == 1 ?? Bool !! $!implicit-topic-mode > 1 }
method required-topic() { $!implicit-topic-mode > 1 || Bool }
method exception() { $!implicit-topic-mode > 2 || Bool }
method set-fresh-variables(Bool :$match, Bool :$exception) {
nqp::bindattr_i(self, RakuAST::Block, '$!fresh-match', $match ?? 1 !! 0);
nqp::bindattr_i(self, RakuAST::Block, '$!fresh-exception', $exception ?? 1 !! 0);
}
method attach-target-names() {
self.IMPL-WRAP-LIST(['block'])
}
method clear-attachments() {
self.clear-handler-attachments();
self.clear-placeholder-attachments();
self.clear-phaser-attachments();
Nil
}
method propagate-sink(Bool $is-sunk) {
$!body.apply-sink($is-sunk);
}
method PRODUCE-IMPLICIT-DECLARATIONS() {
my @implicit;
unless self.IMPL-HAS-PARAMETER('$_') {
if $!implicit-topic-mode == 1 {
@implicit[0] := RakuAST::VarDeclaration::Implicit::BlockTopic.new:
parameter => self.signature ?? False !! True;
}
elsif $!implicit-topic-mode == -1 {
@implicit[0] := RakuAST::VarDeclaration::Implicit::BlockTopic.new:
parameter => False;
}
elsif $!implicit-topic-mode == 2 {
@implicit[0] := RakuAST::VarDeclaration::Implicit::BlockTopic.new:
:required,
parameter => self.signature ?? False !! True;
}
elsif $!implicit-topic-mode == 3 {
@implicit[0] := RakuAST::VarDeclaration::Implicit::BlockTopic.new(:required,
:exception);
}
}
if $!fresh-match {
nqp::push(@implicit, RakuAST::VarDeclaration::Implicit::Special.new(:name('$/')));
}
if $!fresh-exception {
nqp::push(@implicit, RakuAST::VarDeclaration::Implicit::Special.new(:name('$!')));
}
self.IMPL-WRAP-LIST(@implicit)
}
method PERFORM-BEGIN(RakuAST::Resolver $resolver, RakuAST::IMPL::QASTContext $context) {
# Make sure that our placeholder signature has resolutions performed,
# and that we don't produce a topic parameter.
my $placeholder-signature := self.placeholder-signature;
if $placeholder-signature {
$placeholder-signature.IMPL-CHECK($resolver, $context, True);
if $!implicit-topic-mode > 0 {
my $topic := self.IMPL-UNWRAP-LIST(self.get-implicit-declarations)[0];
$topic.set-parameter(False);
}
}
self.IMPL-STUB-PHASERS($resolver, $context);
self.IMPL-STUB-CODE($resolver, $context);
Nil
}
method PRODUCE-META-OBJECT() {
self.IMPL-PRODUCE-META-OBJECT
}
method IMPL-PRODUCE-META-OBJECT() {
# Create block object and install signature. If it doesn't have one, then
# we can create it based upon the implicit topic it may or may not have.
my $block := nqp::create(Block);
my $signature := self.signature || self.placeholder-signature;
if $signature {
nqp::bindattr($block, Code, '$!signature', $signature.meta-object);
nqp::bindattr($signature.meta-object, Signature, '$!code', $block);
}
elsif $!implicit-topic-mode > 0 {
my constant REQUIRED-TOPIC-SIG := -> {
my $param := nqp::create(Parameter);
nqp::bindattr_s($param, Parameter, '$!variable_name', '$_');
my $sig := nqp::create(Signature);
nqp::bindattr($sig, Signature, '@!params', [$param]);