# HG changeset patch
# User Christian Urban <urbanc@in.tum.de>
# Date 1576346263 0
# Node ID a5fa8ab52fe0c26fb7d39ca60e72471b7a035c7c
# Parent  27959a711959f74e179a8030a4eb1044bb72c819
updated

diff -r 27959a711959 -r a5fa8ab52fe0 handouts/ho07.pdf
Binary file handouts/ho07.pdf has changed
diff -r 27959a711959 -r a5fa8ab52fe0 handouts/ho07.tex
--- a/handouts/ho07.tex	Sat Dec 07 00:57:23 2019 +0000
+++ b/handouts/ho07.tex	Sat Dec 14 17:57:43 2019 +0000
@@ -6,13 +6,14 @@
 \usepackage{../graphics}
 
 
+%% add safety check on references...whether it is above 0 and below the 
+%% index
+
 \begin{document}
 \fnote{\copyright{} Christian Urban, King's College London, 2017, 2018, 2019}
 
 \section*{Handout 7 (Compilation)}
 
-
-
 The purpose of a compiler is to transform a program a human can read and
 write into code the machine can run as fast as possible. The fastest
 code would be machine code the CPU can run directly, but it is often
diff -r 27959a711959 -r a5fa8ab52fe0 hws/hw09.pdf
Binary file hws/hw09.pdf has changed
diff -r 27959a711959 -r a5fa8ab52fe0 hws/hw09.tex
--- a/hws/hw09.tex	Sat Dec 07 00:57:23 2019 +0000
+++ b/hws/hw09.tex	Sat Dec 14 17:57:43 2019 +0000
@@ -60,7 +60,8 @@
 }
 \end{lstlisting}
 
-  
+\item What is the difference between a parse tree and an abstract
+  syntax tree? Give some simple examples for each of them.
 
 
 
diff -r 27959a711959 -r a5fa8ab52fe0 progs/fun_llvm.scala
--- a/progs/fun_llvm.scala	Sat Dec 07 00:57:23 2019 +0000
+++ b/progs/fun_llvm.scala	Sat Dec 14 17:57:43 2019 +0000
@@ -138,7 +138,7 @@
 val e7 = Call("foo", List(Num(3)))
 CPSi(e7)
 
-val e8 = Call("foo", List(Num(3), Num(4), Aop("+", Num(5), Num(6))))
+val e8 = Call("foo", List(Aop("*", Num(3), Num(1)), Num(4), Aop("+", Num(5), Num(6))))
 CPSi(e8)
 
 val e9 = Sequence(Aop("*", Var("a"), Num(3)), Aop("+", Var("b"), Num(6)))
@@ -239,6 +239,16 @@
   (end - start)/(i * 1.0e9)
 }
 
+// for Scala 2.12
+/*
+def deserialise[T](file: String) : Try[T] = {
+    val in = new ObjectInputStream(new FileInputStream(new File(file)))
+    val obj = Try(in.readObject().asInstanceOf[T])
+    in.close()
+    obj
+}
+*/
+
 def deserialise[T](fname: String) : Try[T] = {
   import scala.util.Using
   Using(new ObjectInputStream(new FileInputStream(fname))) {