From 90977d1a7c9e9eea20a17305cbb22065f1af2d1f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Torsten=20R=C3=BCger?= <torsten@rubydesign.fi>
Date: Tue, 20 Aug 2019 22:06:37 +0300
Subject: [PATCH] First version of new post

Compiling Parfait, better mom, builtin etc
---
 app/assets/images/1600_tests.png              | Bin 0 -> 17219 bytes
 ...-20-parsing-parfait-and-other-goodies.haml | 204 ++++++++++++++++++
 2 files changed, 204 insertions(+)
 create mode 100644 app/assets/images/1600_tests.png
 create mode 100644 app/views/posts/_2019-08-20-parsing-parfait-and-other-goodies.haml

diff --git a/app/assets/images/1600_tests.png b/app/assets/images/1600_tests.png
new file mode 100644
index 0000000000000000000000000000000000000000..9cc329e0a37b4438ab76ab08b9dcb90cd9d0a3a9
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diff --git a/app/views/posts/_2019-08-20-parsing-parfait-and-other-goodies.haml b/app/views/posts/_2019-08-20-parsing-parfait-and-other-goodies.haml
new file mode 100644
index 0000000..8c06777
--- /dev/null
+++ b/app/views/posts/_2019-08-20-parsing-parfait-and-other-goodies.haml
@@ -0,0 +1,204 @@
+%p
+  As we rubyx will eventually need to parse and compile itself, i am very happy to
+  report success on the first steps on that journey. Also benchmarks, better design
+  and another conference are on the list.
+
+%h2 Compiling parfait
+%p
+  As a recap, Parfait is that part of the core library that we need already during
+  compilation. Ie the compiler creates Parfait objects during compilation and uses
+  Parfait code to do this. This off course is a conundrum, which is solved by using the
+  Parfait Code as is in the compiler (and some ruby module magic to avoid name clashes)
+%p
+  Naturally any meaningful program that the compiler generates will use Parfait
+  and so Parfait must be available at run-time, ie parsed and compiled. Since i have been
+  busy doing the basics, this has been on the ToDo for a long while.
+%p
+  Now, finally, most the basics are inplace and i have started what feels like a tremendous
+  task. In fact i have succefully compiled
+  %em three files.
+  Object, DataObject and Integer, to be precise.
+%p
+  The significance of this is actually much greater (especially since there are no tests)
+  yet. Parfait, as part of rubyx, is what one may call ideomatic ruby, ie real world ruby.
+  Off course i have to smoothen out a few bugs before compiling actually worked, but
+  surprisingly little. In other words the compiler is functional enough to
+  compile larger more feature ritch ruby programs, but more on that below.
+
+%h2 Design improvements
+%p
+  The overall design has been like in the picture below for a while already.
+  Alas, the implementation oof this architecture was slightly lacking.
+  To be precise, when mom code was generated, it was immediately converted to risc.
+  In other words the layer only existed conceptually, or in transit.
+%p.center.three_width
+  = image_tag "architecture.png" ,  alt: "Architectural layers"
+%p
+  Now the code works
+  %em exactly
+  as advertised. Ruby comes in from the top and binary code out at the bottom.
+  But more than that, every layer is a distinct step, in fact there are methods on the
+  topmost compiler object to create every level down from ruby. This is obviously
+  very handy for testing.
+
+%h2 Automated binary tests
+%p
+  Speaking of testing, we are at over 1600 tests, which is more than 200 up from before
+  the design rewrite. At over 15000 assertions this is still 95%, in other words everything
+  apart from a few fails. And with parallel execution still fast.
+
+%p.center.full_width
+  = image_tag "1600_tests.png" ,  alt: "Lots of test, never boring"
+%p
+  But the main achievement a couple of weeks ago was the integration of binary testing
+  int the automated test flow. Specifically on
+  %em Travis.
+%p
+  This uses a feature of Qemu that i had not know before, namely that one can get qemu
+  to run binaries from a different target on a machine, by simply calling it with
+  qemu-arm.
+%p
+  I had done previous testing of binaries via ssh, usually to an qemu emulated pi on my
+  machine. This setup is vastly more complicated, as described
+  =ext_link "here" , "/arm/qemu.html"
+  and i had shied away from that. Meaning they would happen irregularily and all that.
+  My only consolation was that the test would run on the interpreter, but off course that
+  does not test the arm and elf genertion.
+%p
+  The actual tests that i am talking about are a growing number of "mains" tests, found in
+  the tets/mains directory.
+  These are actal programs that calculate or output stuff. They are complete system
+  tests in the sense that we only test their output (system output).
+%p
+  As we usually link to "a.out" files (thus overwriting and avoiding cleanup), the actual
+  invocation of qemu for a binary is really simple:
+  %pre
+    %code
+      qemnu-arm ./a.out
+  but that still leaves you to generate that binary. This can be done by using the
+  rubyxc compiler and linking the resulting object file (see bug #13). But sine i too am a
+  lazy programmer i have automated these steps into the rubyxc compiler, and so one
+  can just compile/link/execute a source file like this:
+  %pre
+    %code
+      :preserve
+        ./bin/rubyxc execute test/mains/source/fibo__8.rb
+  This will compile, link and execute this specific fibonachi test. This output
+  of this test will be 8, as encoded in the file name.
+  So this and 20 others will be tested as binaries now every time travid does its thing.
+%p
+  BTW, i have also created arubyxc command to execute a file via the interpreter.
+  This can sometimes yield better errors when things go wrong.
+  %pre
+    %code
+      :preserve
+        ./bin/rubyxc interpret test/mains/source/puts_Hello-there_11.rb
+  And as a second btw, i also added an option to the compiler, so one can control the
+  Parfait factory size with the option --parfait.
+
+
+%h2 Misc other news
+%h3 Microbenchmarks
+%p
+  At the last conference in Hamburg, someone asked the fair question: So how fast is it?
+  It's been so long that i did tests, that i could only mumble.
+  Now i finished updating the tests, but it will be a while before i can answer the
+  question more fully.
+%p
+  So for starters, because the functionality of the compiler is limited, i did very small
+  benchmarks. Very small means 20 lines or less, loops, string output, fibonacchi, both
+  linear and recursive. I realized too late, that that will tell most about integer
+  performance.
+%p
+  Now because of the early days, i will not go into detail here. In general speed was not
+  as fast as i had hoped from by 4 year old benchmarks, about the same as mri. I
+  will have to do some work on the calling convention and probably some on integer
+  handling too. I think i can quite easily shave 30-50% off, and that alone should
+  verify the saying that all benchmarks are lies. Like the one where rubyx is doing
+  "hello world" faster than C. Yes, C, not mri. But only because i switched the buffering
+  off, because also rubyx does not buffer (apples and oranges ...)
+%p
+  So i will take this round as inspiration to do some optimisation and performance
+  measuring. And come back to it later.
+
+%h3 Implicit returns
+%p
+  As part of parsing Parfait, i implemented a first version of implicit returns.
+  Low hanging fruits, and in fact most common use cases, included constants and calls.
+  So when a method ends in a simple variable, constant, or a call, a return will be added.
+  More complex rules like returns for if's or while will ave to wait, but i found that i
+  personally don't tend to use them anyway.
+%p
+  Since class methods are basically methods (of the meta class), adding the unified
+  return handling to them was easy too.
+
+%h3 Improved Block handling
+%p
+  Block handling, at least the simple implicit kind, has worked for a while, but was in
+  several ways too complicated. The block was unneccessarily assigned to a local, and
+  compiling was handled by picking them out.
+%p
+  This all stemmed from a misunderstanding, or lack of understanding: Blocks, or should
+  i say Lambdas, are constants. Just like a string or integer. They are created once at
+  compile time and can not change identity. In fact Methods and Classes are also contants,
+  and i reflected this in the Vool level by calling them Expressions, instead of
+  before Statements.
+%p
+  So now the Lambda Expression is created and just added as an argument to the send.
+  Compiling thee Lambda is triggered by the constant creation, ie the step down from
+  vool to mom, and the block compiler added to method compiler automatically.
+
+%h3 Vool coming into focus
+%p
+  I've been saying ruby without the fluff, to descibe vool. And while that is true,
+  it is quite vague. Two major things have become clear about vool through the work above.
+%p
+  Firstly, Vool has no complex or recursive send statements. Arguments must be variables or
+  constants. Calls are executed before and assigned to a temporary variable. In effect
+  recursive calls are flattened into a list, and as such the calling does not rely on a
+  stack as in ruby.
+%p
+  Secondly, Vool distinguishes between expressions and statements. Like other lower level,
+  but not ruby. As a rule of thumb, Statements do things, Expression are things. In other
+  words, only expressions have value, statements (lke if or while) do not.
+
+%h2 Plans
+%h4 GrillRB conference
+%p
+  I will speak in
+  =ext_link "Wrazlaw" , "https://grillrb.com/"
+  in about a week. The plan is to make a comparison with rails and focus on the
+  possibilities, rather than technical detail.
+
+%h4 Calling
+%p
+  The Calling can do with work and i noticed two mistakes i did. One is that creating
+  a new message for every call is unneccessarily complicated. Its is only in the
+  special case that a Proc is created that the return sequence (a mom instruciton) needs
+  to keep the message alive.
+%h4 Integers
+%p
+  I still want to hang on to Integers being objects, though creation is clealy costly.
+  In the future a full escape analysis will help off course, but for now it should be easy
+  enough to figure out wether an int is passed down. If not loops can be
+  destructively change the int. A simple special case is a the times method.
+
+%h4 Mom instruction invocation
+%p
+  I have this idea of being able to code more stuff higher up. To make that more
+  efficient i am thinking of macros or instruction invocation at the vool level.
+  Only inside Parfait off course. The basic idea would be to save the call/return
+  code, and have eg X.return_jump map to the Mom::ReturnJump Instruction. "Just" have
+  to figure out the passing semantics, or how that integrates intot the vools code.
+%h4 Better Builtin
+%p
+  The generation of the current builtin methods has always bothered me a bit.
+  It is true that some things just can not be expressed as ruby and so some
+  alternative mechanism is needed (even in c one can embed assembler).
+%p
+  The main problem i have is that those methods don't check their arguments and as such
+  may cause core dumps. So they are to high level and hopefully all we really need is
+  that previous idea of being able to integrate Mom code into vool. As Mom is extensible
+  that should take care of any possible need. And we could code the methods normally as
+  part of Parfait, make them safe, and just use the lower level inside them. Lets see!.
+