| author | Christian Urban <christian dot urban at kcl dot ac dot uk> |
| Sun, 15 Nov 2015 21:31:31 +0000 | |
| changeset 369 | 43c0ed473720 |
| parent 327 | 9470cd124667 |
| child 370 | a65767fe5d71 |
| permissions | -rw-r--r-- |
|
327
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
1 |
\documentclass{article}
|
|
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
2 |
\usepackage{../style}
|
|
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
3 |
\usepackage{../langs}
|
|
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
4 |
|
|
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
5 |
|
|
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
6 |
\begin{document}
|
|
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
7 |
|
|
369
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
8 |
\section*{Handout 7 (Compilation)}
|
|
327
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
9 |
|
|
369
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
10 |
The purpose of a compiler is to transform a program, a human |
|
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
11 |
can write, into code the machine can run as fast as possible. |
|
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
12 |
The fastest code would be machine code the CPU can run |
|
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
13 |
directly, but it is often enough to improve the speed of a |
|
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
14 |
program by just targeting a virtual machine. This produces not |
|
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
15 |
the fastest possible code, but code that is fast enough and |
|
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
16 |
has the advantage that the virtual machine care of things a |
|
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
17 |
compiler would normally need to take care of (like explicit |
|
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
18 |
memory management). |
|
327
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
19 |
|
|
369
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
20 |
We will be generating code for the Java Virtual Machine. This |
|
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
21 |
is a stack-based virtual machine which will make it easy to |
|
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
22 |
generate code for arithmetic expressions. Recall |
|
43c0ed473720
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
327
diff
changeset
|
23 |
that our |
|
327
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
24 |
|
|
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
25 |
\end{document}
|
|
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
26 |
|
|
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
27 |
%%% Local Variables: |
|
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
28 |
%%% mode: latex |
|
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
29 |
%%% TeX-master: t |
|
9470cd124667
updated
Christian Urban <christian dot urban at kcl dot ac dot uk>
parents:
diff
changeset
|
30 |
%%% End: |