Perl 6

SMOP Mold: Revision 16

(Mold is currently under implementation)
SMOP Mold is a register based interpreter implementation
A DSL called m0ld is used to represent mold opcodes in text form

A Mold block(?) is composed of three parts

* the number of registers used by the program (not counting the ones used to put constants or the 3 special ones)
* constants - which are put into registers
* opcodes

The registers 1,2,3 are initialised with

* interpreter
* identifier
* capture

Mold opcodes

# call invocant,identifier,named,positionals,target
# call2 responder,capture,target
# goto label - jumps to label
# br register,iftrue,iffalse - jumps to iftruel if the native bool in register is true to iffalse otherwise

$*OUT.print("hello world\n") is translated to

# register declarations

my $r9;
my $r10; # we have to store even unused return values somewhere

# constants

my $r4 = $SMOP__S1P__RootNamespace;
my $r5 = "postcircumfix:{ }";
my $r6 = "$*OUT";
my $r7 = "print";
my $r8 = "hello world\n";

#opcodes
$r9 = $r4.$r5($r6);
$r10 = $r9.$r7($8);

The opcodes part ultimatly compiles to such byte code

1 4 5 1 6 0 9
1 9 7 1 8 0 10
0