This program is a very simple compiler which accepts a Pascal like syntax and generates a 3 address assembly code along with a compile structure graph.
In fact this is a tool for generating input sample for another experimental work which is a global optimizer.
Please note that this is not intended to be a fully operational compiler.
- bison
- flex
- gcc
- make
- graphviz (optional)
- doxygen (optional)
make
./mesi < samples/hard.msi
Now, you have "code.3a" which is 3 address code, and "tree.dot" which is the tree structure, with graphwiz syntax. If you wanna see it
dot -Tps tree.dot
Now you have tree.ps. If you wanna jpeg output just use -Tjpeg.
This is input code:
var
a,b:int;
c,d:char;
e:int;
f:int;
h:char;
g:char;
begin
a := 2;
c := d * (3+6) - f;
lab:
if a then
c := d * e
else
if d then goto lab;
lab2:
if c then
d:=5
else goto lab2;
end.
This is generated 3 address assembly code:
def int a
def int b
def char c
def char d
def int e
def int f
def char h
def char g
a := 2
_t0 := 3 + 6
_t1 := d * _t0
c := _t1 - f
lab :
if a = 0 goto _l0
c := d * e
goto _l1
_l0 :
if d = 0 goto _l2
goto lab
_l2 :
_l1 :
lab2 :
if c = 0 goto _l3
d := 5
goto _l4
_l3 :
goto lab2
_l4 :
And this is graph:
