/
Runtime.pm
167 lines (144 loc) · 4.28 KB
/
Runtime.pm
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use _007::Q;
use _007::Runtime::Builtins;
role Frame {
has $.block;
has %.pad;
}
constant NO_OUTER = {};
role _007::Runtime {
has $.output;
has @!frames;
submethod BUILD(:$output) {
$!output = $output;
my $setting = Val::Block.new(
:outer-frame(NO_OUTER));
self.enter($setting);
self.load-builtins;
}
method run(Q::Statements $statements) {
my $compunit = Val::Block.new(
:$statements,
:outer-frame(self.current-frame));
self.enter($compunit);
$statements.run(self);
self.leave;
CATCH {
when X::Control::Return {
die X::ControlFlow::Return.new;
}
}
}
method enter($block) {
my $frame = Frame.new(:$block);
@!frames.push($frame);
for $block.statements.static-lexpad.kv -> $name, $value {
self.declare-var($name, $value);
}
for $block.statements.kv -> $i, $_ {
when Q::Statement::Sub {
my $name = .ident.name;
my $parameters = .parameters;
my $statements = .statements;
my $outer-frame = $frame;
my $val = Val::Sub.new(:$name, :$parameters, :$statements, :$outer-frame);
self.put-var($name, $val);
}
}
}
method leave {
@!frames.pop;
}
method unroll-to($frame) {
until self.current-frame === $frame {
self.leave;
}
return;
}
method current-frame {
@!frames[*-1];
}
method !find($symbol) {
my $frame = self.current-frame;
repeat while $frame !=== NO_OUTER {
return $frame.pad
if $frame.pad{$symbol} :exists;
$frame = $frame.block.outer-frame;
}
die X::Undeclared.new(:$symbol);
}
method put-var($name, $value) {
my %pad := self!find($name);
%pad{$name} = $value;
}
method get-var($name) {
my %pad := self!find($name);
return %pad{$name};
}
method declare-var($name, $value?) {
self.current-frame.pad{$name} = Val::None.new;
if defined $value {
self.put-var($name, $value);
}
}
method declared($name) {
try self!find($name) && return True;
return False;
}
method declared-locally($name) {
my $frame = self.current-frame;
return True
if $frame.pad{$name} :exists;
}
method register-subhandler {
self.declare-var("--RETURN-TO--");
self.put-var("--RETURN-TO--", $.current-frame);
}
method load-builtins {
my $builtins = _007::Runtime::Builtins.new(:runtime(self));
for $builtins.get-subs.kv -> $name, $subval {
self.declare-var($name, $subval);
}
}
method sigbind($type, $c, @args) {
die "$type with {$c.parameters.elems} parameters " # XXX: make this into an X::
~ "called with {@args.elems} arguments"
unless $c.parameters == @args;
self.enter($c);
for $c.parameters Z @args -> ($param, $arg) {
my $name = $param.name;
self.declare-var($name, $arg);
}
}
multi method call(Val::Block $c, @args) {
self.sigbind("Block", $c, @args);
$c.statements.run(self);
self.leave;
return Val::None.new;
}
multi method call(Val::Sub $c, @args) {
self.sigbind("Sub", $c, @args);
self.register-subhandler;
my $frame = self.current-frame;
$c.statements.run(self);
self.leave;
CATCH {
when X::Control::Return {
die $_ # keep unrolling the interpreter's stack until we're there
unless .frame === $frame;
self.unroll-to($frame);
self.leave;
return .value;
}
}
return Val::None.new;
}
multi method call(Val::Sub::Builtin $c, @args) {
my $result = $c.code.(|@args);
return $result if $result;
return Val::None.new;
}
method property($obj, $propname) {
my $builtins = _007::Runtime::Builtins.new(:runtime(self));
return $builtins.property($obj, $propname);
}
}