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Actions.pm
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Actions.pm
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class Perl6::Actions is HLL::Actions;
our @BLOCK;
our @PACKAGE;
our $TRUE;
our %BEGINDONE;
INIT {
# initialize @BLOCK and @PACKAGE
our @BLOCK := Q:PIR { %r = root_new ['parrot';'ResizablePMCArray'] };
our @PACKAGE := Q:PIR { %r = root_new ['parrot';'ResizablePMCArray'] };
@PACKAGE.unshift(Perl6::Compiler::Module.new());
our $TRUE := PAST::Var.new( :name('true'), :scope('register') );
our %BEGINDONE := Q:PIR { %r = root_new ['parrot';'Hash'] };
# Tell PAST::Var how to encode Perl6Str and Str values
my %valflags :=
Q:PIR { %r = get_hll_global ['PAST';'Compiler'], '%valflags' };
%valflags<Perl6Str> := 'e';
%valflags<Str> := 'e';
}
sub xblock_immediate($xblock) {
$xblock[1] := block_immediate($xblock[1]);
$xblock;
}
sub block_immediate($block) {
$block.blocktype('immediate');
$block;
}
sub sigiltype($sigil) {
$sigil eq '%'
?? 'Hash'
!! ($sigil eq '@' ?? 'Array' !! 'Perl6Scalar');
}
method deflongname($/) {
make $<colonpair>
?? ~$<name> ~ ':<' ~ ~$<colonpair>[0]<circumfix><quote_EXPR><quote_delimited><quote_atom>[0] ~ '>'
!! ~$<name>;
}
method comp_unit($/) {
# Create the block for the mainline code.
my $mainline := @BLOCK.shift;
$mainline.push($<statementlist>.ast);
# Create a block for the entire compilation unit.
our $?RAKUDO_HLL;
my $unit := PAST::Block.new( :node($/), :hll($?RAKUDO_HLL) );
# Executing the compilation unit causes the mainline to be executed.
# We force a tailcall here, because we have other :load/:init blocks
# that have to be done at the end of the unit, and we don't want them
# executed by the mainline.
$unit.push(
PAST::Op.new(
:pirop('tailcall'),
PAST::Var.new( :name('!UNIT_START'), :namespace(''), :scope('package') ),
$mainline,
PAST::Var.new( :scope('parameter'), :name('@_'), :slurpy(1) )
)
);
# CHECK time occurs at the end of the compilation unit, :load/:init.
# (We can't # use the .loadinit property because that will generate
# the CHECK block too early.)
$unit.push(
PAST::Block.new(
:pirflags(':load :init'), :lexical(0), :namespace(''),
PAST::Op.new( :name('!fire_phasers'), 'CHECK' )
)
);
# If this unit is loaded via load_bytecode, we want it to automatically
# execute the mainline code above after all other initializations have
# occurred.
$unit.push(
PAST::Block.new(
:pirflags(':load'), :lexical(0), :namespace(''),
PAST::Op.new(
:name('!UNIT_START'), :pasttype('call'),
PAST::Val.new( :value($unit) ),
)
)
);
# Make sure we have a clean @PACKAGE for next time.
@PACKAGE.shift;
@PACKAGE.unshift(Perl6::Compiler::Module.new());
make $unit;
}
method statementlist($/) {
my $past := PAST::Stmts.new( :node($/) );
if $<statement> {
for $<statement> {
my $ast := $_.ast;
if $ast {
if $ast.isa(PAST::Block) && !$ast.blocktype {
$ast := block_immediate($ast);
}
elsif $ast<past_block> && !$ast<past_block>.blocktype {
$ast := block_immediate($ast<past_block>);
}
$past.push( $ast );
}
}
}
make $past;
}
method semilist($/) {
my $past := PAST::Stmts.new( :node($/) );
if $<statement> {
for $<statement> { $past.push($_.ast); }
}
else { $past.push( PAST::Op.new( :name('&Nil') ) ); }
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 {
$past := PAST::Op.new($mc<cond>.ast, $past, PAST::Op.new(:name('&Nil')),
:pasttype(~$mc<sym>), :node($/) );
}
if $ml {
my $cond := $ml<smexpr>.ast;
if ~$ml<sym> eq 'given' {
$past := PAST::Op.new(
:pasttype('call'),
PAST::Block.new(
:blocktype('declaration'),
PAST::Var.new( :name('$_'), :scope('parameter'), :isdecl(1) ),
$past
),
$cond
);
}
elsif ~$ml<sym> eq 'for' {
$past := PAST::Block.new( :blocktype('immediate'),
PAST::Var.new( :name('$_'), :scope('parameter'), :isdecl(1) ),
$past);
$cond := PAST::Op.new(:name('&eager'), $cond);
$past := PAST::Op.new($cond, $past, :pasttype(~$ml<sym>), :node($/) );
}
else {
$past := PAST::Op.new($cond, $past, :pasttype(~$ml<sym>), :node($/) );
}
}
}
elsif $<statement_control> { $past := $<statement_control>.ast; }
else { $past := 0; }
make $past;
}
method xblock($/) {
make PAST::Op.new( $<EXPR>.ast, $<pblock>.ast, :pasttype('if'), :node($/) );
}
method pblock($/) {
my $block := $<blockoid>.ast;
my $signature;
if pir::defined__IP($block<placeholder_sig>) && $<signature> {
$/.CURSOR.panic('Placeholder variable cannot override existing signature');
}
elsif pir::defined__IP($block<placeholder_sig>) {
$signature := $block<placeholder_sig>;
}
elsif $<signature> {
$signature := $<signature>.ast;
$block.blocktype('declaration');
}
else {
$signature := Perl6::Compiler::Signature.new();
unless $block.symbol('$_') {
if $*IMPLICIT {
my $parameter := Perl6::Compiler::Parameter.new();
$parameter.var_name('$_');
$parameter.optional(1);
$parameter.is_parcel(1);
$parameter.default_from_outer(1);
$signature.add_parameter($parameter);
}
else {
add_implicit_var($block, '$_', 1);
}
}
}
if $<lambda> eq '<->' {
$signature.set_rw_by_default();
}
add_signature($block, $signature, 0);
if $<lambda> {
prevent_null_return($block);
}
make $block;
}
method block($/) {
make $<blockoid>.ast;
}
method blockoid($/) {
my $past := $<statementlist>.ast;
my $BLOCK := @BLOCK.shift;
$BLOCK.push($past);
$BLOCK.node($/);
make $BLOCK;
}
method newpad($/) {
our @BLOCK;
our @PACKAGE;
my $new_block := PAST::Block.new( PAST::Stmts.new(
PAST::Op.new(
:inline(" .local pmc true\n true = get_hll_global 'True'")
),
PAST::Var.new(
:name('__CANDIDATE_LIST__'), :scope('lexical'), :isdecl(1)
)
));
@BLOCK.unshift($new_block);
unless @PACKAGE[0].block {
@PACKAGE[0].block($new_block);
}
}
method outerlex($/) {
my $outer_ctx := %*COMPILING<%?OPTIONS><outer_ctx>;
if pir::defined__IP($outer_ctx) {
my $block := @BLOCK[0];
my %lexinfo := Perl6::Compiler.get_lexinfo($outer_ctx);
for %lexinfo { $block.symbol($_.key, :scope<lexical>); }
my @ns := pir::getattribute__PPs($outer_ctx, 'current_namespace').get_name;
@ns.shift;
$block.namespace(@ns);
}
}
method finishpad($/) {
# Generate the $_, $/, and $! lexicals if they aren't already
# declared. For routines and methods, they're simply created as
# undefs; for other blocks they initialize to their outer lexical.
my $BLOCK := @BLOCK[0];
my $outer := $*IN_DECL ne 'routine' && $*IN_DECL ne 'method';
for <$_ $/ $!> {
# Generate the lexical variable except if...
# (1) the block already has one, or
# (2) the variable is '$_' and $*IMPLICIT is set
# (this case gets handled by getsig)
unless $BLOCK.symbol($_) || ($_ eq '$_' && $*IMPLICIT) {
add_implicit_var($BLOCK, $_, $outer);
}
}
}
## Statement control
method statement_control:sym<if>($/) {
my $count := +$<xblock> - 1;
my $past := xblock_immediate( $<xblock>[$count].ast );
if $<else> {
$past.push( block_immediate( $<else>[0].ast ) );
}
# 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.pasttype('unless');
make $past;
}
method statement_control:sym<while>($/) {
my $past := xblock_immediate( $<xblock>.ast );
$past.pasttype(~$<sym>);
make $past;
}
method statement_control:sym<repeat>($/) {
my $pasttype := 'repeat_' ~ ~$<wu>;
my $past;
if $<xblock> {
$past := xblock_immediate( $<xblock>.ast );
$past.pasttype($pasttype);
}
else {
$past := PAST::Op.new( $<EXPR>.ast, block_immediate( $<pblock>.ast ),
:pasttype($pasttype), :node($/) );
}
make $past;
}
method statement_control:sym<for>($/) {
my $past := xblock_immediate($<xblock>.ast);
$past.pasttype('for');
$past[0] := PAST::Op.new(:name('&eager'), $past[0]);
$past.arity($past[1].arity || 1);
make $past;
}
method statement_control:sym<loop>($/) {
my $block := $<block>.ast;
$block.blocktype('immediate');
my $cond := $<e2> ?? $<e2>[0].ast !! 1;
my $loop := PAST::Op.new( $cond, $block, :pasttype('while'), :node($/) );
if $<e3> {
$loop.push( $<e3>[0].ast );
}
if $<e1> {
$loop := PAST::Stmts.new( $<e1>[0].ast, $loop, :node($/) );
}
make $loop;
}
method statement_control:sym<need>($/) {
my $past := PAST::Stmts.new( :node($/) );
for $<module_name> {
need($_);
}
make $past;
}
sub need($module_name) {
# Build up adverbs hash if we have them. Note that we need a hash
# for now (the compile time call) and an AST that builds said hash
# for the runtime call once we've compiled the module.
my $name := $module_name<longname><name>.Str;
my %adverbs;
my $adverbs_ast := PAST::Op.new(
:name('&circumfix:<{ }>'), PAST::Op.new( :name('&infix:<,>') )
);
if $module_name<longname><colonpair> {
for $module_name<longname><colonpair> {
my $ast := $_.ast;
$adverbs_ast[0].push($ast);
%adverbs{$ast[1].value()} := $ast[2].value();
}
}
# Need to immediately load module and get lexicals stubbed in.
Perl6::Module::Loader.need($name, %adverbs);
# Also need code to do the actual loading emitting (though need
# won't repeat its work if already carried out; we mainly need
# this for pre-compilation to PIR to work).
my @ns := pir::split__PSS('::', 'Perl6::Module');
@BLOCK[0].loadinit.push(
PAST::Op.new( :pasttype('callmethod'), :name('need'),
PAST::Var.new( :name('Loader'), :namespace(@ns), :scope('package') ),
$name,
PAST::Op.new( :pirop('getattribute PPS'), $adverbs_ast, '$!storage' )
));
}
method statement_control:sym<import>($/) {
my $past := PAST::Stmts.new( :node($/) );
import($/);
make $past;
}
sub import($/) {
my $name := $<module_name><longname><name>.Str;
Perl6::Module::Loader.stub_lexical_imports($name, @BLOCK[0]);
my @ns := pir::split__PSS('::', 'Perl6::Module');
@BLOCK[0].push(
PAST::Op.new( :pasttype('callmethod'), :name('import'),
PAST::Var.new( :name('Loader'), :namespace(@ns), :scope('package') ),
$name
));
}
method statement_control:sym<use>($/) {
my $past := PAST::Stmts.new( :node($/) );
if $<module_name> {
if ~$<module_name> eq 'fatal' {
declare_variable($/, PAST::Stmts.new(), '$', '*', 'FATAL', 0);
$past := PAST::Op.new(
:name('&infix:<=>'),
:node($/),
PAST::Op.new(
:name('!find_contextual'),
:pasttype('call'),
:lvalue(0),
'$*FATAL',
),
PAST::Var.new(
:name('True'),
:namespace(['Bool']),
:scope('package'),
),
);
}
elsif ~$<module_name> eq 'MONKEY_TYPING' {
$*MONKEY_TYPING := 1;
}
else {
need($<module_name>);
import($/);
}
}
make $past;
}
method statement_control:sym<given>($/) {
my $past := $<xblock>.ast;
$past.push($past.shift); # swap [0] and [1] elements
$past.pasttype('call');
make $past;
}
method statement_control:sym<when>($/) {
# Get hold of the smartmatch expression and the block.
my $xblock := $<xblock>.ast;
my $sm_exp := $xblock.shift;
my $block := $xblock.shift;
# Add exception handler to the block so we fall out of the enclosing block
# after it's executed.
$block.blocktype('immediate');
when_handler_helper($block);
# Handle the smart-match. XXX Need to handle syntactic cases too.
my $match_past := PAST::Op.new( :pasttype('call'), :name('&infix:<~~>'),
PAST::Var.new( :name('$_'), :scope('lexical') ),
$sm_exp
);
# Use the smartmatch result as the condition for running the block.
make PAST::Op.new( :pasttype('if'), :node( $/ ),
$match_past, $block,
);
}
method statement_control:sym<default>($/) {
# We always execute this, so just need the block, however we also
# want to make sure we break after running it.
my $block := $<block>.ast;
$block.blocktype('immediate');
when_handler_helper($block);
make $block;
}
method statement_control:sym<CATCH>($/) {
my $block := $<block>.ast;
push_block_handler($/, @BLOCK[0], $block);
@BLOCK[0].handlers()[0].handle_types_except('CONTROL');
make PAST::Stmts.new(:node($/));
}
method statement_control:sym<CONTROL>($/) {
my $block := $<block>.ast;
push_block_handler($/, @BLOCK[0], $block);
@BLOCK[0].handlers()[0].handle_types('CONTROL');
make PAST::Stmts.new(:node($/));
}
method statement_prefix:sym<BEGIN>($/) {
# BEGIN is kinda tricky. We actually need to run the code in it with
# immediate effect, and then have the BEGIN block evaluate to what
# was produced at runtime. But if we're in a pre-compiled module, we
# need to run the lot. Thus we keep a "already computed BEGIN values"
# hash and don't re-run if the value is in that. Of course, we still
# don't handle looking at things in outer lexical scopes here.
our %BEGINDONE;
our $?RAKUDO_HLL;
my $past := $<blorst>.ast;
$past.hll($?RAKUDO_HLL);
my $compiled := PAST::Compiler.compile($past);
my $begin_id := $past.unique('BEGINDONE_');
%BEGINDONE{$begin_id} := $compiled();
@BLOCK[0].loadinit.push(PAST::Op.new(
:pasttype('call'), :name('!begin_unless_begun'),
$begin_id, $past
));
make PAST::Var.new( :scope('keyed'),
PAST::Var.new( :name('%BEGINDONE'), :namespace(pir::split('::', 'Perl6::Actions')), :scope('package') ),
PAST::Val.new( :value($begin_id) )
);
}
method statement_prefix:sym<CHECK>($/) { add_phaser($/, 'CHECK'); }
method statement_prefix:sym<INIT>($/) { add_phaser($/, 'INIT'); }
method statement_prefix:sym<END>($/) { add_phaser($/, 'END'); }
method statement_prefix:sym<do>($/) {
my $past := $<blorst>.ast;
$past.blocktype('immediate');
make $past;
}
method statement_prefix:sym<gather>($/) {
my $past := $<blorst>.ast;
$past.blocktype('declaration');
make PAST::Op.new( :pasttype('call'), :name('!GATHER'), $past );
}
method statement_prefix:sym<try>($/) {
my $block := $<blorst>.ast;
$block.blocktype('immediate');
my $past := PAST::Op.new( :pasttype('try'), $block );
# On failure, capture the exception object into $!.
$past.push(PAST::Op.new(
:inline( ' .get_results (%r)',
' $P0 = new ["Perl6Exception"]',
' setattribute $P0, "$!exception", %r',
' store_lex "$!", $P0' )
));
# Otherwise, put a failure into $!.
$past.push(PAST::Op.new( :pasttype('bind'),
PAST::Var.new( :name('$!'), :scope('lexical') ),
PAST::Op.new( :pasttype('call'), :name('!FAIL') )
));
make $past;
}
method blorst($/) {
my $block := $<block>
?? $<block>.ast
!! PAST::Block.new( $<statement>.ast, :node($/) );
$block.blocktype('declaration');
make $block;
}
sub add_phaser($/, $bank) {
@BLOCK[0].loadinit.push(
PAST::Op.new( :pasttype('call'), :name('!add_phaser'),
$bank, $<blorst>.ast, :node($/))
);
make PAST::Stmts.new(:node($/));
}
# Statement modifiers
method statement_mod_cond:sym<if>($/) { make $<cond>.ast; }
method statement_mod_cond:sym<unless>($/) { make $<cond>.ast; }
method statement_mod_loop:sym<while>($/) { make $<smexpr>.ast; }
method statement_mod_loop:sym<until>($/) { make $<smexpr>.ast; }
method statement_mod_loop:sym<for>($/) { make $<smexpr>.ast; }
method statement_mod_loop:sym<given>($/) { make $<smexpr>.ast; }
## Terms
method term:sym<fatarrow>($/) { make $<fatarrow>.ast; }
method term:sym<colonpair>($/) { make $<colonpair>.ast; }
method term:sym<variable>($/) { make $<variable>.ast; }
method term:sym<package_declarator>($/) { make $<package_declarator>.ast; }
method term:sym<scope_declarator>($/) { make $<scope_declarator>.ast; }
method term:sym<routine_declarator>($/) { make $<routine_declarator>.ast; }
method term:sym<multi_declarator>($/) { make $<multi_declarator>.ast; }
method term:sym<regex_declarator>($/) { make $<regex_declarator>.ast; }
method term:sym<type_declarator>($/) { make $<type_declarator>.ast; }
method term:sym<statement_prefix>($/) { make $<statement_prefix>.ast; }
method term:sym<lambda>($/) { make create_code_object($<pblock>.ast, 'Block', 0, ''); }
method name($/) { }
method module_name($/) {
my @name := Perl6::Grammar::parse_name(~$<longname>);
my $var := PAST::Var.new(
:name(@name.pop),
:namespace(@name),
:scope('package')
);
if $<arglist> {
my $past := $<arglist>[0].ast;
$past.pasttype('callmethod');
$past.name('postcircumfix:<[ ]>');
$past.unshift($var);
make $past;
}
else {
make $var;
}
}
method fatarrow($/) {
make make_pair($<key>.Str, $<val>.ast);
}
method colonpair($/) {
if $*key {
if $<var> {
make make_pair($*key, make_variable($/, ~$<var>));
}
elsif $*value ~~ Regex::Match {
make make_pair($*key, $*value.ast);
}
elsif $*value == 0 {
make make_pair($*key, PAST::Var.new( :name('False'), :namespace('Bool'), :scope('package') ));
}
else {
make make_pair($*key, PAST::Var.new( :name('True'), :namespace('Bool'), :scope('package') ));
}
}
else {
make $*value.ast;
}
}
sub make_pair($key, $value) {
my @name := Perl6::Grammar::parse_name('Pair');
$value.named('value');
PAST::Op.new(
:pasttype('callmethod'),
:returns('Pair'),
:name('new'),
PAST::Var.new( :name(@name.pop), :namespace(@name), :scope('package') ),
PAST::Val.new( :value($key), :named('key') ),
$value
)
}
method variable($/) {
my $past;
if $<index> {
$past := PAST::Op.new(
:name('!postcircumfix:<[ ]>'),
PAST::Var.new( :name('$/') ),
+$<index>
);
}
elsif $<postcircumfix> {
$past := $<postcircumfix>.ast;
$past.unshift( PAST::Var.new( :name('$/') ) );
}
else {
$past := make_variable($/, ~$/);
}
make $past;
}
sub make_variable($/, $name) {
my @name := Perl6::Grammar::parse_name($name);
my $past := PAST::Var.new( :name(@name.pop) );
if @name {
$past.namespace(@name);
$past.scope('package');
}
if $<twigil>[0] eq '*' {
$past := PAST::Op.new( $past.name(), :pasttype('call'), :name('!find_contextual'), :lvalue(0) );
}
elsif $<twigil>[0] eq '!' {
$past.scope('attribute');
$past.viviself( sigiltype( $<sigil> ) );
$past.unshift(PAST::Var.new( :name('self'), :scope('lexical') ));
}
elsif $<twigil>[0] eq '.' && $*IN_DECL ne 'variable' {
# Need to transform this to a method call.
$past := $<arglist> ?? $<arglist>[0].ast !! PAST::Op.new();
$past.pasttype('callmethod');
$past.name(~$<desigilname>);
$past.unshift(PAST::Var.new( :name('self'), :scope('lexical') ));
}
elsif $<twigil>[0] eq '^' || $<twigil>[0] eq ':' {
$past := add_placeholder_parameter($<sigil>.Str, $<desigilname>.Str, :named($<twigil>[0] eq ':'));
}
elsif ~$/ eq '@_' {
$past := add_placeholder_parameter('@', '_', :slurpy_pos(1));
}
elsif ~$/ eq '%_' {
$past := add_placeholder_parameter('%', '_', :slurpy_named(1));
}
else {
my $attr_alias := is_attr_alias($past.name);
if $attr_alias {
$past.name($attr_alias);
$past.scope('attribute');
$past.viviself( sigiltype( $<sigil> ) );
$past.unshift(PAST::Var.new( :name('self'), :scope('lexical') ));
}
elsif $<sigil> eq '&' && !@name {
$past := PAST::Op.new(:pirop('find_sub_not_null__Ps'), $past.name);
}
}
$past
}
method package_declarator:sym<package>($/) { make $<package_def>.ast; }
method package_declarator:sym<module>($/) { make $<package_def>.ast; }
method package_declarator:sym<class>($/) { make $<package_def>.ast; }
method package_declarator:sym<grammar>($/) { make $<package_def>.ast; }
method package_declarator:sym<role>($/) { make $<package_def>.ast; }
method package_declarator:sym<does>($/) {
our @PACKAGE;
@PACKAGE[0].traits.push(PAST::Op.new(
:pasttype('call'),
:name('&trait_mod:<does>'),
$<typename>.ast
));
make PAST::Stmts.new();
}
method package_def($/, $key?) {
our @PACKAGE;
# Is this the opening of a new package?
if $key eq 'open' {
# Create the right kind of package compiler.
my $pkg_compiler := %*PKGCOMPILER{$*PKGDECL};
if pir::isa__IPS($pkg_compiler, 'Undef') { $pkg_compiler := Perl6::Compiler::Package; }
my $package := $pkg_compiler.new();
# Set HOW and other details.
my $how := %*HOW{$*PKGDECL};
unless $how { $/.CURSOR.panic("No HOW declared for package declarator $*PKGDECL"); }
$package.how($how);
$*SCOPE := $*SCOPE || 'our';
$package.scope($*SCOPE);
if $<def_module_name> {
my $name := ~$<def_module_name>[0]<longname><name>;
if $name ne '::' {
$/.CURSOR.add_name($name);
$package.name($name);
}
if $<def_module_name>[0]<signature> {
$package.signature($<def_module_name>[0]<signature>[0].ast);
$package.signature_text(~$<def_module_name>[0]<signature>[0]);
}
if $<def_module_name>[0]<longname><colonpair> {
for $<def_module_name>[0]<longname><colonpair> {
$package.name_adverbs.push($_.ast);
}
}
}
# Add traits.
for $<trait> {
$package.traits.push($_.ast);
}
# Put on front of packages list. Note - nesting a package in a role is
# not supported (gets really tricky in the parametric case - needs more
# thought and consideration).
if +@PACKAGE && pir::isa__IPS(@PACKAGE[0], 'Role') {
$/.CURSOR.panic("Can not nest a package inside a role");
}
@PACKAGE.unshift($package);
}
else {
# We just need to finish up the current package.
my $package := @PACKAGE.shift;
if pir::substr__SSII($<block><blockoid><statementlist><statement>[0], 0, 3) eq '...' {
# Just a stub, so don't do any more work.
if $*SCOPE eq 'our' || $*SCOPE eq '' {
%Perl6::Grammar::STUBCOMPILINGPACKAGES{~$<def_module_name>[0]<longname>} := 1;
}
@BLOCK[0].symbol(~$<def_module_name>[0]<longname>, :stub(1));
make PAST::Stmts.new( );
}
else {
my $block;
if $<block> {
$block := $<block>.ast;
}
else {
$block := @BLOCK.shift;
$block.push($<statementlist>.ast);
$block.node($/);
}
make $package.finish($block);
}
}
}
method scope_declarator:sym<my>($/) { make $<scoped>.ast; }
method scope_declarator:sym<our>($/) { make $<scoped>.ast; }
method scope_declarator:sym<has>($/) { make $<scoped>.ast; }
method scope_declarator:sym<augment>($/) { make $<scoped>.ast; }
method declarator($/) {
if $<variable_declarator> { make $<variable_declarator>.ast }
elsif $<routine_declarator> { make $<routine_declarator>.ast }
elsif $<regex_declarator> { make $<regex_declarator>.ast }
elsif $<signature> {
my $list := PAST::Op.new( :pasttype('call'), :name('&infix:<,>') );
my $decls := $<signature>.ast.get_declarations;
for @($decls) {
$list.push(declare_variable($/, $_, $_<sigil>, $_<twigil>, $_<desigilname>, $_<traits>));
}
$list<signature_from_declarator> := $<signature>.ast;
make $list;
}
else {
$/.CURSOR.panic('Unknown declarator type');
}
}
method multi_declarator:sym<multi>($/) { make $<declarator> ?? $<declarator>.ast !! $<routine_def>.ast }
method multi_declarator:sym<proto>($/) { make $<declarator> ?? $<declarator>.ast !! $<routine_def>.ast }
method multi_declarator:sym<only>($/) { make $<declarator> ?? $<declarator>.ast !! $<routine_def>.ast }
method multi_declarator:sym<null>($/) { make $<declarator>.ast }
method scoped($/) {
make $<DECL>.ast;
}
method variable_declarator($/) {
my $past := $<variable>.ast;
my $sigil := $<variable><sigil>;
my $twigil := $<variable><twigil>[0];
my $name := ~$sigil ~ ~$twigil ~ ~$<variable><desigilname>;
if @BLOCK[0].symbol($name) {
$/.CURSOR.panic("Redeclaration of symbol ", $name);
}
make declare_variable($/, $past, ~$sigil, ~$twigil, ~$<variable><desigilname>, $<trait>);
}
sub declare_variable($/, $past, $sigil, $twigil, $desigilname, $trait_list) {
my $name := $sigil ~ $twigil ~ $desigilname;
my $BLOCK := @BLOCK[0];
if $*SCOPE eq 'has' {
# Find the current package and add the attribute.
my $attrname := ~$sigil ~ '!' ~ $desigilname;
our @PACKAGE;
unless +@PACKAGE {
$/.CURSOR.panic("Can not declare an attribute outside of a package");
}
if @PACKAGE[0].has_attribute($attrname) {
$/.CURSOR.panic("Can not re-declare attribute " ~ $attrname);
}
my %attr_info;
%attr_info<name> := $attrname;
%attr_info<accessor> := $twigil eq '.' ?? 1 !! 0;
%attr_info<rw> := $trait_list && has_compiler_trait_with_val($trait_list, '&trait_mod:<is>', 'rw') ?? 1 !! 0;
@PACKAGE[0].attributes.push(%attr_info);
# If no twigil, note $foo is an alias to $!foo.
if $twigil eq '' {
$BLOCK.symbol($name, :attr_alias($attrname));
}
# Nothing to emit here; just hand back an empty node, but also
# annotate it with the attribute table.
$past := PAST::Stmts.new( );
$past<attribute_data> := %attr_info;
}
else {
# Not an attribute - need to emit delcaration here.
# First, create a container and give it a 'rw' property
# Create the container, give it a 'rw' property
my $cont := $sigil eq '%' ??
PAST::Op.new( :name('&CREATE_HASH_LOW_LEVEL'), :pasttype('call') ) !!
PAST::Op.new( sigiltype($sigil), :pirop('new Ps') );
my $true := PAST::Var.new( :name('true'), :scope('register') );
my $vivipast := PAST::Op.new( $cont, 'rw', $true, :pirop('setprop'));
# If it's a scalar, mark it as scalar (non-flattening)
if $sigil eq '$' || $sigil eq '&' {
$vivipast := PAST::Op.new($vivipast,'scalar',$true,:pirop('setprop'));
}
# For 'our' variables, we first bind or lookup in the namespace
if $*SCOPE eq 'our' {
$vivipast := PAST::Var.new( :name($name), :scope('package'), :isdecl(1),
:lvalue(1), :viviself($vivipast), :node($/) );
}
# Now bind a lexical in the block
my $decl := PAST::Var.new( :name($name), :scope('lexical'), :isdecl(1),
:lvalue(1), :viviself($vivipast), :node($/) );
$BLOCK.symbol($name, :scope('lexical'), :decl_node($decl) );
$BLOCK[0].push($decl);
# If we have traits, set up us the node to emit handlers into, then
# emit them.
my $init_type := 0;
if $trait_list || $*TYPENAME {
my $trait_node := get_var_traits_node($BLOCK, $name);
for $trait_list {
my $trait := $_.ast;
$trait.unshift(PAST::Var.new( :name('declarand'), :scope('register') ));
if $trait.name() eq '&trait_mod:<of>' && $*TYPENAME {
$init_type := $trait[1] := PAST::Op.new(
:pasttype('callmethod'), :name('postcircumfix:<[ ]>'),
$*TYPENAME, $trait[1]
);
$*TYPENAME := '';
}
$trait_node.push($trait);
}
if $*TYPENAME {
$trait_node.push(PAST::Op.new(
:pasttype('call'), :name('&trait_mod:<of>'),
PAST::Var.new( :name('declarand'), :scope('register') ),
$*TYPENAME
));
$init_type := $*TYPENAME;
}
}
# For arrays, need to transform_to_p6opaque. XXX Find a neater way
# to do this.
if $sigil eq '@' {
get_var_traits_node($BLOCK, $name).push(PAST::Op.new(
:pirop('transform_to_p6opaque vP'),
PAST::Var.new( :name('$P0'), :scope('register') )
));
}
# If we've a type to init with and it's a scalar, do so.
if $init_type && $sigil eq '$' {
$cont.pirop('new PsP');
$cont.push($init_type);
}
}
return $past;
}
method routine_declarator:sym<sub>($/) { make $<routine_def>.ast; }
method routine_declarator:sym<method>($/) { make $<method_def>.ast; }
method routine_declarator:sym<submethod>($/) { make $<method_def>.ast; }
method routine_def($/) {
my $past := $<blockoid>.ast;
$past.blocktype('declaration');
$past.control('return_pir');
if pir::defined__IP($past<placeholder_sig>) && $<multisig> {
$/.CURSOR.panic('Placeholder variable cannot override existing signature');
}
my $signature := $<multisig> ?? $<multisig>[0].ast !!
pir::defined__IP($past<placeholder_sig>) ?? $past<placeholder_sig> !!
Perl6::Compiler::Signature.new();
$signature.set_default_parameter_type('Any');
my $sig_setup_block := add_signature($past, $signature, 1);
if $<trait> {
emit_routine_traits($past, $<trait>, 'Sub', $sig_setup_block);
}
if $<deflongname> {
# Set name.
my $name := '&' ~ ~$<deflongname>[0].ast;
$past.name(~$<deflongname>[0].ast);
$past.nsentry('');
# Wrap it in the correct routine type.
my $multi_flag := PAST::Val.new( :value(0) );
$past := create_code_object($past, 'Sub', $multi_flag, $sig_setup_block);
# Handle multi-ness, if any.
my $symbol_holder := $*SCOPE eq 'our' ?? @PACKAGE[0].block !! @BLOCK[0];
my $symbol := $symbol_holder.symbol($name);
if $*MULTINESS eq 'only' {
if $symbol {
$/.CURSOR.panic('Can not declare only routine ' ~ $name ~
' when another routine with this name was already declared');
}
}
elsif $*MULTINESS || ($symbol && $symbol<multis>) {
# If no multi declarator and no proto, error.
if !$*MULTINESS && !$symbol<proto> {
$/.CURSOR.panic('Can not re-declare sub ' ~ $name ~ ' without declaring it multi');
}
# If it's a proto, stash it away in the symbol entry.
if $*MULTINESS eq 'proto' { $symbol_holder.symbol($name, :proto($past)) }
# Otherwise, create multi container if we don't have one; otherwise,
# just push this candidate onto it.
if $symbol<multis> {
$symbol<multis>.push($past);
$past := 0;
}
else {
$past := PAST::Op.new(
:pasttype('callmethod'),
:name('set_candidates'),
PAST::Op.new( :inline(' %r = new ["Perl6MultiSub"]') ),
$past
);
$symbol_holder.symbol($name, :multis($past));
$past := PAST::Op.new(
:pasttype('callmethod'), :name('incorporate_candidates'),
$past, PAST::Op.new( :pirop('find_lex_skip_current PS'), $name )
);