Perl 6
SMOP: Revision 48
^ Simple Meta Object Programming / Simple Matter Of Programming

SMOP is an alternative implementation of a C engine to run Perl 6. It is focused in getting the most pragmatic approach possible, but still focusing in being able to support all Perl 6 features. Its core resembles Perl 5 in some ways, and it differs from "Parrot"<> in many ways, including the fact that SMOP is *not a Virtual Machine*. SMOP is simply a runtime engine that happens to have a *interpreter run loop*.
[SMOP Hacking] [SMOP Debugging] [SMOP Portability]

^^ Important topics on SMOP

* SMOP doesn't recurse in the C stack, and it doesn't actually define a mandatory paradigm (stack-based or register-based). SMOP has a [Polymorphic Eval], that allows you to switch from one interpreter loop to another using Continuation Passing Style. See [SMOP Stackless].
* SMOP doesn't define a object system in its own. The only thing it defines is the concept of [SMOP Responder Interface], which then encapsulates whatever object system. This feature is fundamental to implement the [SMOP Native Types].
* SMOP is intended to bootstrap itself from the low-level to the high-level. This is achieved by the fact that *everything in SMOP is an Object*. This way, even the low-level objects can be exposed to the high level runtime. See [SMOP OO Bootstrap].
* SMOP won't implement a parser in its own, it will use [KindaPerl6] parser or whatever parser gets ported to its runtime first.
* SMOP defines two [Domain Specific] Languages for low-level aid:
** [SMOP sm0p Language]: A small macro language that builds node for the [Default SMOP Interpreter Implementation] in C.
** [SMOP s1p Language]: (read "swamp") A language to help building the high-level built in types, but still translatable to C.
* In order to enable the bootstrap, the runtime have a set of [SMOP Constant Identifiers] that are available for the sub-language compilers to use.
* There are some special [SMOP Values Not Subject to Garbage Collection].

^^^ Other matters

* The array and hash autovivification is discussed in [SMOP Autovivification].
* [SMOP Boot Sequence].
* [SMOP Inter Continuation Communication].
* [SMOP Interpreter Implementation API].
* [SMOP Run Loop].
* [SMOP p6opaque Implementation]
* [SMOP Default Metaclass]

^^ SMOP Development ROADMAP

In order to keep this simple, the ROADMAP will stay here and will be edited as needed.

^^^ S1P - Read it "Swamp"

* 0.2.1 - Low-level Method implementation (this is not the standard Method type, just something that complies to the API)
* 0.2.2 - Low-level Attribute implementation
* 0.2.3 - Low-level Package implementation
* 0.2.4 - Low-level SubMethod implementation
* 0.2.5 - Default MetaClass implementation (This is the default Perl 6 OO Meta Class)
* 0.2.6 - p6opaque Responder Interface (This is the default Perl 6 OO Responder Interface)
* 0.2.7 - s1p compiler
* 0.2.8 - src-s1p/ compiled to src-s1p/Object.c
* 0.2.9 - Final review on the s1p language
* 0.2.10 - working
* 0.3.11 - Object with all features working

^^^ Completing SMOP runtime

* 0.3.1 - SMOP NATIVE prototypes and lowlevel operators
* 0.3.2 - Undef builtin types.
* 0.3.3 - Immutable builtin types.
* 0.3.4 - Mutable builtin types.
* 0.3.5 - Lexical Scope / Namespaces.

^^^ Perl 6 SMOP

* 0.4.0 - AST types.
* 0.4.1 - AST -> Stack runtime transformation (real interpreter)
* 0.4.2 - KP6 backend
* 0.4.3 - KP6 can compile grammars to SMOP
* 0.5.0 - KP6 grammar compiled
* 0.9.0 - KP6 bootstrapped in SMOP
* 1.0.0 - STD ported to SMOP

^^^ Other Features

* x.x.x - perl5 embedded - libperl
* x.x.x - parrot embedded - libparrot
* x.x.x - python embedded (stackless python?)
* x.x.x - jvm embedded - libgcj
* x.x.x - spidermonkey embedded - libmoz-js

^^ SMOP Changelog

Usually, things from ROADMAP should come to here when its done.

^^^^ 2008-02-14 - Daniel Ruoso

* x.x.x - Runtime creation of constant identifiers

^^^^ 2008-02-05 - Daniel Ruoso

* *FIRST MAJOR MILESTONE ACHIEVED:* sm0p - Lame Default SMOP Interpreter Implementation
* 0.2.0 - Final review on [SMOP REFERENCE and RELEASE Policy] and code revision for memory leaks.

^^^^ 2008-02-01 - Daniel Ruoso

* 0.1.4 - Final review on Continuation Passing Style implementation

^^^^ 2008-01-31 - Daniel Ruoso

* 0.1.3 - sm0p preprocessor
* x.x.x - Several bug fixes in the capture and in slime.
* x.x.x - 02_stack.t does ok 1..4 for the first time, this means that sm0p is interpreted correctly

^^^^ 2008-01-24 - Daniel Ruoso

* x.x.x - Automake prepared to run the sm0p preprocessor.
* 0.1.2 - SMOP SLIME prototypes and lowlevel operators
* x.x.x - SMOP__SLIME__Capturize
* x.x.x - SMOP__SLIME__Node
* x.x.x - native int type
* x.x.x - SMOP__SLIME__CurrentFrame

^^^^ 2008-01-23 - Daniel Ruoso

* x.x.x - SMOP__SLIME__Frame first code
* x.x.x - native bool type

^^^^ 2008-01-21 - Daniel Ruoso

* 0.1.1 - Capture type (lowlevel implementation)

^^^^ 2008-01-18 - Daniel Ruoso

* 0.1.0 - Port YAP6__CORE__Value code to SMOP__Object code.
* 0.x.x.x - "Identifier Name Constant" type and the definition of the pool of constants.

See also the [Old YAP6 Changelog].

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