# HG changeset patch
# User Christian Urban <urbanc@in.tum.de>
# Date 1569503531 -3600
# Node ID 96a91e4a8ac8aa50e431fdf023dd59f5a93ff05f
# Parent  7c2c0f10c42492f384ef5774c48e14f46bd72ea8
updated

diff -r 7c2c0f10c424 -r 96a91e4a8ac8 pics/javaduke.png
Binary file pics/javaduke.png has changed
diff -r 7c2c0f10c424 -r 96a91e4a8ac8 progs/bfc0.scala
--- a/progs/bfc0.scala	Thu Sep 26 12:59:33 2019 +0100
+++ b/progs/bfc0.scala	Thu Sep 26 14:12:11 2019 +0100
@@ -46,6 +46,8 @@
   fw.close()
 }
 
+// running the c-compiler over the transpiled
+// BF program and running the result
 import sys.process._
 
 def compile_run(prog: String) = {
@@ -62,8 +64,10 @@
   (end - start)/(n * 1.0e9)
 }
 
+// mandelbrot program
+val b0 = load_bff("mandelbrot.bf")
 
-println(s"${time_needed(1, compile_run(load_bff("mandelbrot.bf")))} secs")
+println(s"${time_needed(1, compile_run(b0))} secs")
 
 
 
diff -r 7c2c0f10c424 -r 96a91e4a8ac8 progs/bfc1.scala
--- a/progs/bfc1.scala	Thu Sep 26 12:59:33 2019 +0100
+++ b/progs/bfc1.scala	Thu Sep 26 14:12:11 2019 +0100
@@ -9,6 +9,7 @@
 def load_bff(name: String) : String = 
   Try(Source.fromFile(name)("ISO-8859-1").mkString).getOrElse("")
 
+// "splicing" a BF program counting occurrences
 def splice(cs: List[Char], acc: List[(Char, Int)]) : List[(Char, Int)] = (cs, acc) match {
   case (Nil, acc) => acc
   case (c :: cs, Nil) => splice(cs, List((c, 1)))
@@ -19,6 +20,7 @@
 
 def spl(s: String) = splice(s.toList, Nil).reverse
 
+// generating "compound" c-instructions 
 def instr2(c: Char, n: Int) : String = c match {
   case '>' => "ptr += " + n.toString + ";"
   case '<' => "ptr -= " + n.toString + ";"
@@ -59,7 +61,7 @@
 
 def compile_run(prog: String) = {
   compile("tmp", prog)
-  "gcc -O3 -o tmp tmp.c".!
+  "gcc -O0 -o tmp tmp.c".!
   "./tmp".!
   ()
 }
@@ -71,8 +73,10 @@
   (end - start) / (n * 1.0e9)
 }
 
+// mandelbrot program
+val b0 = load_bff("mandelbrot.bf")
 
-println(s"${time_needed(1, compile_run(load_bff("mandelbrot.bf")))} secs")
+println(s"${time_needed(1, compile_run(b0))} secs")
 
 
 
diff -r 7c2c0f10c424 -r 96a91e4a8ac8 progs/bfi.scala
--- a/progs/bfi.scala	Thu Sep 26 12:59:33 2019 +0100
+++ b/progs/bfi.scala	Thu Sep 26 14:12:11 2019 +0100
@@ -1,16 +1,14 @@
 // An Interpreter for BF*** Programs
 //===================================
 
-
 import io.Source
 import scala.util._
 
-
 // loding a bf-file 
 def load_bff(name: String) : String = 
   Try(Source.fromFile(name)("ISO-8859-1").mkString).getOrElse("")
 
-
+// BF memory as a map
 type Mem = Map[Int, Int]
 
 // reading and writing BF memory
@@ -42,7 +40,7 @@
   }
 }
 
-
+// main interpreter loop
 def compute(prog: String, pc: Int, mp: Int, mem: Mem) : Mem = {
   if (0 <= pc && pc < prog.length) { 
     val (new_pc, new_mp, new_mem) = prog(pc) match {
@@ -67,7 +65,7 @@
 
 def run(prog: String, m: Mem = Map()) = compute(prog, 0, 0, m)
 
-
+// helper code for timing information
 def time_needed[T](n: Int, code: => T) = {
   val start = System.nanoTime()
   for (i <- 0 until n) code
@@ -75,12 +73,14 @@
   (end - start)/(n * 1.0e9)
 }
 
-
+// Testcases
+//===========
 
 // a Mandelbrot set generator in brainf*** written by Erik Bosman
 // (http://esoteric.sange.fi/brainfuck/utils/mandelbrot/)
+val b0 = load_bff("mandelbrot.bf")
 
-println(s"${time_needed(1, run(load_bff("mandelbrot.bf")))} secs")
+println(s"${time_needed(1, run(b0))} secs")
 
 
 // a benchmark program (counts down from 'Z' to 'A')
diff -r 7c2c0f10c424 -r 96a91e4a8ac8 slides/slides01.pdf
Binary file slides/slides01.pdf has changed
diff -r 7c2c0f10c424 -r 96a91e4a8ac8 slides/slides01.tex
--- a/slides/slides01.tex	Thu Sep 26 12:59:33 2019 +0100
+++ b/slides/slides01.tex	Thu Sep 26 14:12:11 2019 +0100
@@ -41,7 +41,7 @@
   \begin{tabular}{ll}
   Email:  & christian.urban at kcl.ac.uk\\
   Office Hours: & Thursdays 12 -- 14\\
-     & N\liningnums{7.07} (North Wing, Bush House)\\
+  Location: & N7.07 (North Wing, Bush House)\\
   Slides \& Progs: & KEATS\\
   \end{tabular}
   \end{center}
@@ -433,7 +433,7 @@
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[c]
-\frametitle{Remember BF***?}
+\frametitle{Remember BF*** from PEP?}
 
 \begin{center}
 \begin{tabular}{lcl}
@@ -454,7 +454,7 @@
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[c]
-  \frametitle{A Compiler for BF***}
+  \frametitle{A ``Compiler'' for BF***}
   
   \begin{center}
   \begin{tabular}{lcl}
@@ -498,6 +498,29 @@
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+  \frametitle{Lectures 5 - 10}
+  
+  code generation for a small imperative and a small functional languages\\[10mm]
+  
+  {\LARGE\bf Interpreters}\medskip\\
+  \hspace{5mm}(directly runs a program)\\[6mm]
+  
+  {\LARGE\bf Compilers}\medskip\\
+  \hspace{5mm}(generates JVM code)
+  
+  \begin{textblock}{1}(10,8.1)
+  \begin{tabular}{c}
+  \includegraphics[scale=0.4]{../pics/javaduke.png}
+  \end{tabular}
+  \end{textblock}
+  
+  \end{frame}
+  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+  
+
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[t]
 \frametitle{Familiar Regular Expr.}