Chapter 2 (#4)

* Start on Chapter 2.

* Start on Chapter 2.

* Refactor

* Refactor

* Initial attempt at peephole opt for add operation

* cleanup unused import

* Start on graph visualizer

* Start on graph visualizer

* Rework chapter 2

Add a short discourse on the Types, and provide a Bottom type.

Make a final toString; require each Node to specify its special printing via label().

Add a recursing printer called print(); toString is used by default in the debugger and so cannot be recursive.

Make the peephole rules based on a proper Type and idealize calls.
Big comments about the Type computations.

Every node picks up a _print, compute and idealize() call.

Rename long arith ops Divide, UnaryMinus, Multiply, Subtract into shorter uniform-length names.  Cleans up the parser where he does the precedence op parsing.

Rework Parser:
- Drop Token class, its all Strings except in the one place we know a number is coming
- Embed the Lexer as a field in the Parser, instead of trying to pass it around everywhere in the Parser
- StartNode becomes a read-only global, so we don't have to pass it around everywhere in the Parser AND optimizer.
- Lexer matches on strings and returns strings.  Match and consume *at the moment* instead of carrying around a current token/string and forcing the next-token after consuming the current one.
- All parse subexpressions shrink by 1/2 after these changes.

* Initial writeup of Chapter 2

* Initial writeup of Chapter 2

* Initial writeup of Chapter 2

* Initial writeup of Chapter 2

* Remove range

* progress Chapter 2

Drop integer ranges.
Broader lattice pic.
Lots of prose changes in the readme.
Fixed title in gviz dot generation.
Fixed bug with peephole making redundant constants.

* Implement compute for all the arithmetic node types
Add a flag to switch off peephole so we can see the full graph
Add post peephole graph to writeup

* Implement compute for all the arithmetic node types
Add a flag to switch off peephole so we can see the full graph
Add post peephole graph to writeup

* Fix bad path to the svg

* Update pre-peephole diagram

* Add dead code elimination

...and a set_def to proper update graph edges.

* Update README.md

* Cleanup the GraphVisualizer a bit.
Update the graphs.
Update the chapter list as chapter 3 deleted, and chapter 4 is now chapter 3.

---------

Co-authored-by: Cliff Click <cliffc@acm.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/chapter02/docs/02-pre-peephole-ex1.gv b/chapter02/docs/02-pre-peephole-ex1.gv
new file mode 100644
index 00000000..d5a16616
--- /dev/null
+++ b/chapter02/docs/02-pre-peephole-ex1.gv
@@ -0,0 +1,27 @@
+digraph chapter02
+{
+	Start1 [shape=box,  label="Start"];
+	Con12 [ label="Con1"];
+	Start1 -> Con12 [style=dotted];
+	Con23 [ label="Con2"];
+	Start1 -> Con23 [style=dotted];
+	Con34 [ label="Con3"];
+	Start1 -> Con34 [style=dotted];
+	Mul5 [ label="Mul"];
+	Con23 -> Mul5;
+	Con34 -> Mul5;
+	Con56 [ label="Con5"];
+	Start1 -> Con56 [style=dotted];
+	Minus7 [ label="Minus"];
+	Con56 -> Minus7;
+	Add8 [ label="Add"];
+	Mul5 -> Add8;
+	Minus7 -> Add8;
+	Add9 [ label="Add"];
+	Con12 -> Add9;
+	Add8 -> Add9;
+	Return10 [shape=box,  label="Return"];
+	Add9 -> Return10;
+	edge [color=red];
+	Start1 -> Return10;
+}
\ No newline at end of file