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Actions.pm
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Actions.pm
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use NQPP6QRegex;
use NQPP5QRegex;
use Perl6::Pod;
use Perl6::ConstantFolder;
use Perl6::Ops;
use QRegex;
use QAST;
role STDActions {
method quibble($/) {
make $<nibble>.ast;
}
method trim_heredoc($doc, $stop, $origast) {
$origast.pop();
$origast.pop();
my int $indent := -nqp::chars($stop.MATCH<ws>.Str);
my $docast := $doc.MATCH.ast;
if $docast.has_compile_time_value {
my $dedented := nqp::unbox_s($docast.compile_time_value.indent($indent));
$origast.push($*W.add_string_constant($dedented));
}
else {
$origast.push(QAST::Op.new(
:op('callmethod'), :name('indent'),
$doc.MATCH.ast,
QAST::IVal.new( :value($indent) )));
}
}
}
class Perl6::Actions is HLL::Actions does STDActions {
our @MAX_PERL_VERSION;
our $FORBID_PIR;
our $STATEMENT_PRINT;
INIT {
# If, e.g., we support Perl up to v6.1.2, set
# @MAX_PERL_VERSION to [6, 1, 2].
@MAX_PERL_VERSION[0] := 6;
$FORBID_PIR := 0;
$STATEMENT_PRINT := 0;
}
sub sink($past) {
my $name := $past.unique('sink');
QAST::Want.new(
$past,
'v',
QAST::Stmts.new(
QAST::Op.new(:op<bind>,
QAST::Var.new(:$name, :scope<local>, :decl<var>),
$past,
),
QAST::Op.new(:op<if>,
QAST::Op.new(:op<if>,
QAST::Op.new(:op<isconcrete>,
QAST::Var.new(:$name, :scope<local>),
),
QAST::Op.new(:op<if>,
QAST::Op.new(:op<can>,
QAST::Var.new(:$name, :scope<local>),
QAST::SVal.new(:value('sink')),
),
QAST::Op.new(:op<defined>,
QAST::Var.new(:$name, :scope<local>),
)
)
),
QAST::Op.new(:op<callmethod>, :name<sink>,
QAST::Var.new(:$name, :scope<local>),
),
),
),
);
}
my %sinkable := nqp::hash(
'call', 1,
'callmethod', 1,
'while', 1,
'until', 1,
'repeat_until', 1,
'repeat_while', 1,
'if', 1,
'unless', 1,
'handle', 1,
);
sub autosink($past) {
nqp::istype($past, QAST::Op) && %sinkable{$past.op} && !$past<nosink>
?? sink($past)
!! $past;
}
method ints_to_string($ints) {
if nqp::islist($ints) {
my $result := '';
for $ints {
$result := $result ~ nqp::chr(nqp::unbox_i($_.ast));
}
$result;
} else {
nqp::chr(nqp::unbox_i($ints.ast));
}
}
# TODO: inline string_to_bigint?
my sub string_to_bigint($src, $base) {
my $res := nqp::radix_I($base, ~$src, 0, 2, $*W.find_symbol(['Int']));
$src.CURSOR.panic("'$src' is not a valid number")
unless nqp::iseq_i(nqp::unbox_i(nqp::atkey($res, 2)), nqp::chars($src));
nqp::atkey($res, 0);
}
sub xblock_immediate($xblock) {
$xblock[1] := pblock_immediate($xblock[1]);
$xblock;
}
sub pblock_immediate($pblock) {
block_immediate($pblock<uninstall_if_immediately_used>.shift);
}
our sub block_immediate($block) {
$block.blocktype('immediate');
$block;
}
# Given a sigil and the the value type specified, works out the
# container type (what should we instantiate and bind into the
# attribute/lexpad), bind constraint (what could we bind to this
# slot later), and if specified a constraint on the inner value
# and a default value.
sub container_type_info($/, $sigil, @value_type, $shape?) {
my %info;
if $sigil eq '@' {
%info<container_base> := $*W.find_symbol(['Array']);
%info<bind_constraint> := $*W.find_symbol(['Positional']);
if @value_type {
%info<container_type> := $*W.parameterize_type_with_args(
%info<container_base>, [@value_type[0]], nqp::hash());
%info<bind_constraint> := $*W.parameterize_type_with_args(
%info<bind_constraint>, [@value_type[0]], nqp::hash());
%info<value_type> := @value_type[0];
}
else {
%info<container_type> := %info<container_base>;
%info<value_type> := $*W.find_symbol(['Mu']);
}
if $shape {
$*W.throw($/, 'X::Comp::NYI', feature => 'Shaped arrays');
}
}
elsif $sigil eq '%' {
%info<container_base> := $*W.find_symbol(['Hash']);
%info<bind_constraint> := $*W.find_symbol(['Associative']);
if $shape {
@value_type[0] := $*W.find_symbol(['Mu']) unless +@value_type;
my $shape_ast := $shape[0].ast;
if $shape_ast.isa(QAST::Stmts) && +@($shape_ast) == 1 && $shape_ast[0].has_compile_time_value {
@value_type[1] := $shape_ast[0].compile_time_value;
}
else {
nqp::die("Invalid hash shape; type expected");
}
}
if @value_type {
%info<container_type> := $*W.parameterize_type_with_args(
%info<container_base>, @value_type, nqp::hash());
%info<bind_constraint> := $*W.parameterize_type_with_args(
%info<bind_constraint>, @value_type, nqp::hash());
%info<value_type> := @value_type[0];
}
else {
%info<container_type> := %info<container_base>;
%info<value_type> := $*W.find_symbol(['Mu']);
}
}
elsif $sigil eq '&' {
%info<container_base> := $*W.find_symbol(['Scalar']);
%info<container_type> := %info<container_base>;
%info<bind_constraint> := $*W.find_symbol(['Callable']);
if @value_type {
%info<bind_constraint> := $*W.parameterize_type_with_args(
%info<bind_constraint>, [@value_type[0]], nqp::hash());
}
%info<value_type> := %info<bind_constraint>;
%info<default_value> := $*W.find_symbol(['Any']);
}
else {
%info<container_base> := $*W.find_symbol(['Scalar']);
%info<container_type> := %info<container_base>;
if @value_type {
%info<bind_constraint> := @value_type[0];
%info<value_type> := @value_type[0];
%info<default_value> := @value_type[0];
}
else {
%info<bind_constraint> := $*W.find_symbol(['Mu']);
%info<value_type> := $*W.find_symbol(['Mu']);
%info<default_value> := $*W.find_symbol(['Any']);
}
}
%info
}
method deflongname($/) {
if $<colonpair> {
my $name := ~$<name>;
if $<colonpair>[0] {
$name := $name ~ ':';
}
if $<colonpair>[0]<identifier> {
$name := $name ~ ~$<colonpair>[0]<identifier>;
}
if $<colonpair>[0]<circumfix><nibble> -> $op_name {
$name := $name ~ '<' ~ $*W.colonpair_nibble_to_str($/, $op_name) ~ '>';
}
make $name;
}
else {
make $*W.disect_deflongname($/).name(
:dba("$*IN_DECL declaration"),
:decl<routine>,
);
}
}
# Turn $code into "for lines() { $code }"
sub wrap_option_n_code($/, $code) {
$code := make_topic_block_ref($code, copy => 1);
return QAST::Op.new(
:op<call>, :name<&eager>,
QAST::Op.new(:op<callmethod>, :name<map>,
QAST::Op.new( :op<call>, :name<&flat>,
QAST::Op.new(
:op<call>, :name<&flat>,
QAST::Op.new(
:name<&lines>,
:op<call>
)
)
),
$code
)
);
}
# Turn $code into "for lines() { $code; say $_ }"
# &wrap_option_n_code already does the C<for> loop, so we just add the
# C<say> call here
sub wrap_option_p_code($/, $code) {
return wrap_option_n_code($/,
QAST::Stmts.new(
$code,
QAST::Op.new(:name<&say>, :op<call>,
QAST::Var.new(:name<$_>)
)
)
);
}
method comp_unit($/) {
# Finish up code object for the mainline.
if $*DECLARAND {
$*W.attach_signature($*DECLARAND, $*W.create_signature(nqp::hash('parameters', [])));
$*W.finish_code_object($*DECLARAND, $*UNIT);
}
# Checks.
$*W.assert_stubs_defined($/);
# Get the block for the unit mainline code.
my $unit := $*UNIT;
my $mainline := QAST::Stmts.new(
$*POD_PAST,
$<statementlist>.ast,
);
if %*COMPILING<%?OPTIONS><p> { # also covers the -np case, like Perl 5
$mainline := wrap_option_p_code($/, $mainline);
}
elsif %*COMPILING<%?OPTIONS><n> {
$mainline := wrap_option_n_code($/, $mainline);
}
# We'll install our view of GLOBAL as the main one; any other
# compilation unit that is using this one will then replace it
# with its view later (or be in a position to restore it).
my $global_install := QAST::VM.new(
pirop => 'set_hll_global vsP',
QAST::SVal.new( :value('GLOBAL') ),
QAST::WVal.new( :value($*GLOBALish) )
);
$*W.add_fixup_task(:deserialize_past($global_install), :fixup_past($global_install));
# Mainline should have fresh lexicals.
$*W.get_static_lexpad($unit).set_fresh_magicals();
# Get the block for the entire compilation unit.
my $outer := $*UNIT_OUTER;
$outer.node($/);
# Load the needed libraries.
$*W.add_libs($unit);
# If the unit defines &MAIN, and this is in the mainline,
# add a &MAIN_HELPER.
if !$*W.is_precompilation_mode && +@*MODULES == 0 && $unit.symbol('&MAIN') {
$mainline := QAST::Op.new(
:op('call'),
:name('&MAIN_HELPER'),
$mainline,
);
}
# If our caller wants to know the mainline ctx, provide it here.
# (CTXSAVE is inherited from HLL::Actions.) Don't do this when
# there was an explicit {YOU_ARE_HERE}.
unless $*HAS_YOU_ARE_HERE {
$unit.push( self.CTXSAVE() );
}
# Add the mainline code to the unit.
$unit.push($mainline);
# Executing the compilation unit causes the mainline to be executed.
$outer.push(QAST::Op.new( :op<call>, $unit ));
# Wrap everything in a QAST::CompUnit.
my $compunit := QAST::CompUnit.new(
:hll('perl6'),
# Serialization related bits.
:sc($*W.sc()),
:code_ref_blocks($*W.code_ref_blocks()),
:compilation_mode($*W.is_precompilation_mode()),
:pre_deserialize($*W.load_dependency_tasks()),
:post_deserialize($*W.fixup_tasks()),
:repo_conflict_resolver(QAST::Op.new(
:op('callmethod'), :name('resolve_repossession_conflicts'),
QAST::VM.new(
pirop => 'get_hll_global Ps',
QAST::SVal.new( :value('ModuleLoader') )
)
)),
# If this unit is loaded as a module, we want it to automatically
# execute the mainline code above after all other initializations
# have occurred.
:load(QAST::Op.new(
:op('call'),
QAST::BVal.new( :value($outer) ),
)),
# Finally, the outer block, which in turn contains all of the
# other program elements.
$outer
);
# Pass some extra bits along to the optimizer.
$compunit<UNIT> := $unit;
$compunit<GLOBALish> := $*GLOBALish;
$compunit<W> := $*W;
make $compunit;
}
# XXX Move to HLL::Actions after NQP gets QAST.
method CTXSAVE() {
QAST::Stmt.new(
QAST::Op.new(
:op('bind'),
QAST::Var.new( :name('ctxsave'), :scope('local'), :decl('var') ),
QAST::Var.new( :name('$*CTXSAVE'), :scope('contextual') )
),
QAST::Op.new(
:op('unless'),
QAST::Op.new(
:op('isnull'),
QAST::Var.new( :name('ctxsave'), :scope('local') )
),
QAST::Op.new(
:op('if'),
QAST::Op.new(
:op<can>,
QAST::Var.new( :name('ctxsave'), :scope('local') ),
QAST::SVal.new( :value('ctxsave') )
),
QAST::Op.new(
:op('callmethod'), :name('ctxsave'),
QAST::Var.new( :name('ctxsave'), :scope('local')
)))))
}
method install_doc_phaser($/) {
# Add a default DOC INIT phaser
my $doc := %*COMPILING<%?OPTIONS><doc>;
if $doc {
my $block := $*W.push_lexpad($/);
my $renderer := "Pod::To::$doc";
my $module := $*W.load_module($/, $renderer, $*GLOBALish);
my $pod2text := QAST::Op.new(
:op<callmethod>, :name<render>, :node($/),
self.make_indirect_lookup([$renderer]),
QAST::Var.new(:name<$=pod>, :scope('lexical'), :node($/))
);
$block.push(
QAST::Op.new(
:op<call>, :node($/),
:name('&say'), $pod2text,
),
);
# TODO: We should print out $?USAGE too,
# once it's known at compile time
$block.push(
QAST::Op.new(
:op<call>, :node($/),
:name('&exit'),
)
);
$*W.pop_lexpad();
$*W.add_phaser(
$/, 'INIT', $*W.create_simple_code_object($block, 'Block'), $block
);
}
}
method pod_content_toplevel($/) {
my $child := $<pod_block>.ast;
# make sure we don't push the same thing twice
if $child {
my $id := $/.from ~ "," ~ ~$/.to;
if !$*POD_BLOCKS_SEEN{$id} {
$*POD_BLOCKS.push($child);
$*POD_BLOCKS_SEEN{$id} := 1;
}
}
make $child;
}
method pod_content:sym<block>($/) {
make $<pod_block>.ast;
}
method pod_configuration($/) {
make Perl6::Pod::make_config($/);
}
method pod_block:sym<delimited>($/) {
make Perl6::Pod::any_block($/);
}
method pod_block:sym<delimited_raw>($/) {
make Perl6::Pod::raw_block($/);
}
method pod_block:sym<delimited_table>($/) {
make Perl6::Pod::table($/);
}
method pod_block:sym<paragraph>($/) {
make Perl6::Pod::any_block($/);
}
method pod_block:sym<paragraph_raw>($/) {
make Perl6::Pod::raw_block($/);
}
method pod_block:sym<paragraph_table>($/) {
make Perl6::Pod::table($/);
}
method pod_block:sym<abbreviated>($/) {
make Perl6::Pod::any_block($/);
}
method pod_block:sym<abbreviated_raw>($/) {
make Perl6::Pod::raw_block($/);
}
method pod_block:sym<abbreviated_table>($/) {
make Perl6::Pod::table($/);
}
method pod_block:sym<end>($/) {
}
method pod_content:sym<config>($/) {
make Perl6::Pod::config($/);
}
method pod_content:sym<text>($/) {
my @ret := [];
for $<pod_textcontent> {
@ret.push($_.ast);
}
my $past := Perl6::Pod::serialize_array(@ret);
make $past.compile_time_value;
}
method pod_textcontent:sym<regular>($/) {
my @t := Perl6::Pod::merge_twines($<pod_string>);
my $twine := Perl6::Pod::serialize_array(@t).compile_time_value;
make Perl6::Pod::serialize_object(
'Pod::Block::Para', :content($twine)
).compile_time_value
}
method pod_textcontent:sym<code>($/) {
my $s := $<spaces>.Str;
my $t := subst($<text>.Str, /\n$s/, "\n", :global);
$t := subst($t, /\n$/, ''); # chomp!
my $past := Perl6::Pod::serialize_object(
'Pod::Block::Code',
:content(Perl6::Pod::serialize_aos([$t]).compile_time_value),
);
make $past.compile_time_value;
}
method pod_formatting_code($/) {
if ~$<code> eq 'V' {
make ~$<content>;
} else {
my @content := [];
for $<pod_string_character> {
@content.push($_.ast)
}
my @t := Perl6::Pod::build_pod_string(@content);
my $past := Perl6::Pod::serialize_object(
'Pod::FormattingCode',
:type(
$*W.add_string_constant(~$<code>).compile_time_value
),
:content(
Perl6::Pod::serialize_array(@t).compile_time_value
)
);
make $past.compile_time_value;
}
}
method pod_string($/) {
my @content := [];
for $<pod_string_character> {
@content.push($_.ast)
}
make Perl6::Pod::build_pod_string(@content);
}
method pod_string_character($/) {
if $<pod_formatting_code> {
make $<pod_formatting_code>.ast
} else {
make ~$<char>;
}
}
method table_row($/) {
make ~$/
}
method unitstart($/) {
# Use SET_BLOCK_OUTER_CTX (inherited from HLL::Actions)
# to set dynamic outer lexical context and namespace details
# for the compilation unit.
self.SET_BLOCK_OUTER_CTX($*UNIT_OUTER);
}
method statementlist($/) {
my $past := QAST::Stmts.new( :node($/) );
if $<statement> {
for $<statement> {
my $ast := $_.ast;
if $ast {
if $ast<sink_past> {
$ast := QAST::Want.new($ast, 'v', $ast<sink_past>);
}
elsif $ast<bare_block> {
$ast := autosink($ast<bare_block>);
}
else {
$ast := QAST::Stmt.new(autosink($ast), :returns($ast.returns)) if $ast ~~ QAST::Node;
}
$past.push( $ast );
}
}
}
if +$past.list < 1 {
$past.push(QAST::Var.new(:name('Nil'), :scope('lexical')));
}
else {
$past.returns($past[+@($past) - 1].returns);
}
make $past;
}
method semilist($/) {
my $past := QAST::Stmts.new( :node($/) );
if $<statement> {
for $<statement> { $past.push($_.ast) if $_.ast; }
}
unless +@($past) {
$past.push( QAST::Op.new( :op('call'), :name('&infix:<,>') ) );
}
make $past;
}
method statement($/, $key?) {
my $past;
if $<EXPR> {
my $mc := $<statement_mod_cond>[0];
my $ml := $<statement_mod_loop>[0];
$past := $<EXPR>.ast;
if $mc {
$mc.ast.push($past);
$mc.ast.push(QAST::Var.new(:name('Nil'), :scope('lexical')));
$past := $mc.ast;
}
if $ml {
my $cond := $ml<smexpr>.ast;
if ~$ml<sym> eq 'given' {
$past := QAST::Op.new(
:op('call'),
make_topic_block_ref($past),
$cond
);
}
elsif ~$ml<sym> eq 'for' {
unless $past<past_block> {
$past := make_topic_block_ref($past);
}
$past := QAST::Op.new(
:op<callmethod>, :name<map>, :node($/),
QAST::Op.new(:op('call'), :name('&infix:<,>'), $cond),
block_closure($past)
);
}
else {
$past := QAST::Op.new($cond, $past, :op(~$ml<sym>), :node($/) );
}
}
}
elsif $<statement_control> { $past := $<statement_control>.ast; }
else { $past := 0; }
if $STATEMENT_PRINT && $past {
$past := QAST::Stmts.new(:node($/),
QAST::Op.new(
:op<say>,
QAST::SVal.new(:value(~$/))
),
$past
);
}
make $past;
}
method xblock($/) {
make QAST::Op.new( $<EXPR>.ast, $<pblock>.ast, :op('if'), :node($/) );
}
method pblock($/) {
if $<blockoid><you_are_here> {
make $<blockoid>.ast;
}
else {
# Locate or build a set of parameters.
my %sig_info;
my @params;
my $block := $<blockoid>.ast;
if $block<placeholder_sig> && $<signature> {
$*W.throw($/, ['X', 'Signature', 'Placeholder'],
placeholder => $block<placeholder_sig>[0]<placeholder>,
);
}
elsif $block<placeholder_sig> {
@params := $block<placeholder_sig>;
%sig_info<parameters> := @params;
}
elsif $<signature> {
%sig_info := $<signature>.ast;
@params := %sig_info<parameters>;
}
else {
unless $block.symbol('$_') {
if $*IMPLICIT {
@params.push(hash(
:variable_name('$_'), :optional(1),
:nominal_type($*W.find_symbol(['Mu'])),
:default_from_outer(1), :is_parcel(1),
));
}
add_implicit_var($block, '$_');
}
%sig_info<parameters> := @params;
}
# Create signature object and set up binding.
if $<lambda> eq '<->' {
for @params { $_<is_rw> := 1 }
}
set_default_parameter_type(@params, 'Mu');
my $signature := create_signature_object($<signature>, %sig_info, $block);
add_signature_binding_code($block, $signature, @params);
# Add a slot for a $*DISPATCHER, and a call to take one.
add_implicit_var($block, '$*DISPATCHER');
$block[0].unshift(QAST::Op.new(:op('p6takedisp')));
# We'll install PAST in current block so it gets capture_lex'd.
# Then evaluate to a reference to the block (non-closure - higher
# up stuff does that if it wants to).
($*W.cur_lexpad())[0].push(my $uninst := QAST::Stmts.new($block));
$*W.attach_signature($*DECLARAND, $signature);
$*W.finish_code_object($*DECLARAND, $block);
my $ref := reference_to_code_object($*DECLARAND, $block);
$ref<uninstall_if_immediately_used> := $uninst;
make $ref;
}
}
method block($/) {
my $block := $<blockoid>.ast;
if $block<placeholder_sig> {
my $name := $block<placeholder_sig>[0]<variable_name>;
unless $name eq '%_' || $name eq '@_' {
$name := nqp::concat_s(nqp::substr($name, 0, 1),
nqp::concat_s('^', nqp::substr($name, 1)));
}
$*W.throw( $/, ['X', 'Placeholder', 'Block'],
placeholder => $name,
);
}
($*W.cur_lexpad())[0].push(my $uninst := QAST::Stmts.new($block));
$*W.attach_signature($*DECLARAND, $*W.create_signature(nqp::hash('parameters', [])));
$*W.finish_code_object($*DECLARAND, $block);
my $ref := reference_to_code_object($*DECLARAND, $block);
$ref<uninstall_if_immediately_used> := $uninst;
make $ref;
}
method blockoid($/) {
if $<statementlist> {
my $past := $<statementlist>.ast;
if %*HANDLERS {
$past := QAST::Op.new( :op('handle'), $past );
for %*HANDLERS {
$past.push($_.key);
$past.push($_.value);
}
}
my $BLOCK := $*CURPAD;
$BLOCK.push($past);
$BLOCK.node($/);
$BLOCK<statementlist> := $<statementlist>.ast;
$BLOCK<handlers> := %*HANDLERS if %*HANDLERS;
make $BLOCK;
}
else {
if $*HAS_YOU_ARE_HERE {
$/.CURSOR.panic('{YOU_ARE_HERE} may only appear once in a setting');
}
$*HAS_YOU_ARE_HERE := 1;
make $<you_are_here>.ast;
}
}
method you_are_here($/) {
make self.CTXSAVE();
}
method newpad($/) {
my $new_block := $*W.cur_lexpad();
$new_block<IN_DECL> := $*IN_DECL;
}
method finishpad($/) {
# Generate the $_, $/, and $! lexicals if they aren't already
# declared. We don't actually give them a value, but rather the
# Perl6LexPad will generate containers (and maybe fill them with
# the outer's value) on demand.
my $BLOCK := $*W.cur_lexpad();
my $type := $BLOCK<IN_DECL>;
my $is_routine := $type eq 'sub' || $type eq 'method' ||
$type eq 'submethod' || $type eq 'mainline';
for ($is_routine ?? <$_ $/ $!> !! ['$_']) {
# Generate the lexical variable except if...
# (1) the block already has one, or
# (2) the variable is '$_' and $*IMPLICIT is set
# (this case gets handled by getsig)
unless $BLOCK.symbol($_) || ($_ eq '$_' && $*IMPLICIT) {
add_implicit_var($BLOCK, $_);
}
}
}
## Statement control
method statement_control:sym<if>($/) {
my $count := +$<xblock> - 1;
my $past := xblock_immediate( $<xblock>[$count].ast );
# push the else block if any, otherwise 'if' returns C<Nil> (per S04)
$past.push( $<else>
?? pblock_immediate( $<else>[0].ast )
!! QAST::Var.new(:name('Nil'), :scope('lexical'))
);
# build if/then/elsif structure
while $count > 0 {
$count--;
my $else := $past;
$past := xblock_immediate( $<xblock>[$count].ast );
$past.push($else);
}
make $past;
}
method statement_control:sym<unless>($/) {
my $past := xblock_immediate( $<xblock>.ast );
$past.op('unless');
make $past;
}
method statement_control:sym<while>($/) {
my $past := xblock_immediate( $<xblock>.ast );
$past.op(~$<sym>);
make tweak_loop($past);
}
method statement_control:sym<repeat>($/) {
my $op := 'repeat_' ~ ~$<wu>;
my $past;
if $<xblock> {
$past := xblock_immediate( $<xblock>.ast );
$past.op($op);
}
else {
$past := QAST::Op.new( $<EXPR>.ast, pblock_immediate( $<pblock>.ast ),
:op($op), :node($/) );
}
make tweak_loop($past);
}
method statement_control:sym<for>($/) {
my $xblock := $<xblock>.ast;
my $past := QAST::Op.new(
:op<callmethod>, :name<map>, :node($/),
QAST::Op.new(:name('&infix:<,>'), :op('call'), $xblock[0]),
block_closure($xblock[1])
);
make $past;
}
method statement_control:sym<loop>($/) {
my $block := pblock_immediate($<block>.ast);
my $cond := $<e2> ?? $<e2>[0].ast !! QAST::Var.new(:name<True>, :scope<lexical>);
my $loop := QAST::Op.new( $cond, :op('while'), :node($/) );
$loop.push($block);
if $<e3> {
$loop.push($<e3>[0].ast);
}
$loop := tweak_loop($loop);
if $<e1> {
$loop := QAST::Stmts.new( $<e1>[0].ast, $loop, :node($/) );
}
make $loop;
}
sub tweak_loop($loop) {
# Make sure the body is in sink context (for now; in the long run,
# need to handle the l-value case).
my $body_past := $loop[1][1];
$body_past.push(QAST::Var.new( :name('Nil'), :scope('lexical') ));
# Handle phasers.
my $code := $loop[1]<code_object>;
my $block_type := $*W.find_symbol(['Block']);
my $phasers := nqp::getattr($code, $block_type, '$!phasers');
if nqp::existskey($phasers, 'NEXT') {
my $phascode := $*W.run_phasers_code($code, $block_type, 'NEXT');
if +@($loop) == 2 {
$loop.push($phascode);
}
else {
$loop[2] := QAST::Stmts.new($phascode, $loop[2]);
}
}
if nqp::existskey($phasers, 'FIRST') {
$loop := QAST::Stmts.new(
QAST::Op.new( :op('p6setfirstflag'), QAST::WVal.new( :value($code) ) ),
$loop);
}
if nqp::existskey($phasers, 'LAST') {
$loop := QAST::Stmts.new(
:resultchild(0),
$loop,
$*W.run_phasers_code($code, $block_type, 'LAST'));
}
$loop
}
method statement_control:sym<need>($/) {
my $past := QAST::Var.new( :name('Nil'), :scope('lexical') );
for $<version> {
# XXX TODO: Version checks.
}
make $past;
}
method statement_control:sym<import>($/) {
my $past := QAST::Var.new( :name('Nil'), :scope('lexical') );
make $past;
}
method statement_control:sym<use>($/) {
my $past := QAST::Var.new( :name('Nil'), :scope('lexical') );
if $<version> {
# TODO: replace this by code that doesn't always die with
# a useless error message
# my $i := -1;
# for $<version><vnum> {
# ++$i;
# if $_ ne '*' && $_ < @MAX_PERL_VERSION[$i] {
# last;
# } elsif $_ > @MAX_PERL_VERSION[$i] {
# my $mpv := nqp::join('.', @MAX_PERL_VERSION);
# $/.CURSOR.panic("Perl $<version> required--this is only v$mpv")
# }
# }
} elsif $<module_name> {
if ~$<module_name> eq 'fatal' {
my $*SCOPE := 'my';
declare_variable($/, QAST::Stmts.new(), '$', '*', 'FATAL', []);
$past := QAST::Op.new(
:op('p6store'), :node($/),
QAST::Var.new( :name('$*FATAL'), :scope('lexical') ),
QAST::Op.new( :op('p6bool'), QAST::IVal.new( :value(1) ) )
);
}
elsif ~$<module_name> eq 'FORBID_PIR' {
$FORBID_PIR := 1;
}
elsif ~$<module_name> eq 'Devel::Trace' {
$STATEMENT_PRINT := 1;
}
}
make $past;
}
method statement_control:sym<require>($/) {
my $past := QAST::Stmts.new(:node($/));
my $name_past := $<module_name>
?? $*W.disect_longname($<module_name><longname>).name_past()
!! $<EXPR>[0].ast;
$past.push(QAST::Op.new(
:op('callmethod'), :name('load_module'),
QAST::VM.new( pirop => 'get_hll_global Ps',
QAST::SVal.new( :value('ModuleLoader') ) ),
$name_past, $*W.symbol_lookup(['GLOBAL'], $/)
));
if $<module_name> && $<EXPR> {
my $p6_arglist := $*W.compile_time_evaluate($/, $<EXPR>[0].ast).list.eager;
my $arglist := nqp::getattr($p6_arglist, $*W.find_symbol(['List']), '$!items');
my $lexpad := $*W.cur_lexpad();
my $*SCOPE := 'my';
my $import_past := QAST::Op.new(:node($/), :op<call>,
:name<&REQUIRE_IMPORT>,
$name_past);
for $arglist {
my $symbol := nqp::unbox_s($_.Str());
$*W.throw($/, ['X', 'Redeclaration'], :$symbol)
if $lexpad.symbol($symbol);
declare_variable($/, $past,
nqp::substr($symbol, 0, 1), '', nqp::substr($symbol, 1),
[]);
$import_past.push($*W.add_string_constant($symbol));
}
$past.push($import_past);
}
$past.push(QAST::Var.new( :name('Nil'), :scope('lexical') ));
make $past;
}
method statement_control:sym<given>($/) {
my $past := $<xblock>.ast;
$past.push($past.shift); # swap [0] and [1] elements