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vmwcc version 0.1.5
a c-subset compiler by Vince Weaver <vince deater.net>
originally based off of code by Martin Burtscher (cornell.edu)
Current Status:
Output: 32 bit PPC assembly
Optimizations: _OFF_
Known Bugs: Few
Unknown bugs: Many
Eventual Goal:
Output: PPC, Alpha, RiSC, more?
Optimizations: Strength Reduction, Common sub-expression elimination
Dead code removal
The C-Subset
~~~~~~~~~~~~
feature working will it ever
if/else yes
while yes
for loops yes
structs yes
arrays yes
integer math yes
long type yes
int type yes
non-void funcs yes
link to libc partially
sizeof partially
floating-point no unlikely
ternary (?:) no unlikely
typedef no unlikely
bitwise ops no maybe
pointers no maybe
pre/post inc/dec no maybe
+=,-=,*=,etc no maybe
in-line assembly no maybe
chars no hopefully
c pre-processor no hopefully a subset
goto no unlikely
switch()/case no unlikely
self-hosting no when pigs fly
Non-standard functions supported:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
WriteLine(); -- write a blank line
WriteLong(x); -- write out a long (x) to stdout
ReadLong(x); -- read a long into x
Technology:
~~~~~~~~~~~
Uses a parser created directly from EBNF.
Uses SSA (Static Single Assignment) as an intermediate language.
Background:
~~~~~~~~~~~
This began as my ECE495 project. Unfortunately it wasn't done at
the end of the semester. I've worked on it since then and it has
made progress.
Running:
~~~~~~~~
The options are designed to be as compatible as possible with gcc.
Please note. Optimizations are not debugged yet, so use -O2 at your
own risk. Also, while many tests are made before release
(see the ./samples directory) there are undoubtedly many
bugs lurking. So please be patient and always use gcc
if you absolutely need your code working perfectly.
Usage:
./vmwcc [-Ox] [-S] [-W] [-c] [-dom] [-h] [-m arch] [-o filename]
[-ssa] [-v] filename.c
-Ox : Use optimization level x (0 means none)
-S : Output assembly language file only
-W : Enable warnings
-c : Output object file only
-dom : Output dominator tree in .dot format
-g : Ignored. For compatibility with gcc only
-h : Help. This help message
-m arch : Output target. Defaults to ppc-linux for now
-o filename : Output object or executable to this filename
-pg : Ignored. For compatibility with gcc only
-ssa : Output internal SSA information to file
-v : Output version information
Compatability:
~~~~~~~~~~~~~~
To make programs compile in both gcc and vmwcc add the following
lines to the top of the file:
#include <stdio.h>
#define WriteLine() printf("n");
#define WriteLong(x) printf(" %ld", x);
#define ReadLong(a) if (fscanf(stdin, "%ld", &a) != 1) a = 0;
vmwcc will ignore them but gcc will do the right thing.
Why:
~~~~
Why create such an obviously broken compiler when gcc works fine?
Because it is fun. Also I am seeing if I can have the compiler
optimize for size, rather than speed.
And also, gcc is a mess if you ever look at the code. vmwcc is too
but there's a lot less of it to sort through.
~~~
Vince Weaver, vincedeater.net http://www.deater.net/weave/
16 June 2004
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Contents of dev/c/vmwcc-mos.lha PERMSSN UID GID PACKED SIZE RATIO CRC STAMP NAME
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[generic] 192 300 64.0% -lh5- 1304 Jul 18 2004 vmwcc-0.1.7/BUGS
[generic] 2228 4985 44.7% -lh5- 6cb2 Jul 18 2004 vmwcc-0.1.7/Changelog
[generic] 341 550 62.0% -lh5- f8c2 Jun 12 2004 vmwcc-0.1.7/OPTIMIZATIONS_TODO
[generic] 1760 3886 45.3% -lh5- 37ef Jul 17 2004 vmwcc-0.1.7/README
[generic] 1272 7413 17.2% -lh5- 6b1d Dec 9 2003 vmwcc-0.1.7/sources/alpha_backend.c
[generic] 112 156 71.8% -lh5- 61e7 Jan 31 2004 vmwcc-0.1.7/sources/backends.h
[generic] 897 3007 29.8% -lh5- 7a96 Jun 17 2004 vmwcc-0.1.7/sources/block.c
[generic] 295 561 52.6% -lh5- d56b Jun 17 2004 vmwcc-0.1.7/sources/block.h
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[generic] 1657 6261 26.5% -lh5- 9d2d Jan 24 2004 vmwcc-0.1.7/sources/cse.c
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[generic] 4 4 100.0% -lh0- 4dba Jun 5 2004 vmwcc-0.1.7/sources/test_suite/exam.test1
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[generic] 174 308 56.5% -lh5- 0325 Dec 15 2003 vmwcc-0.1.7/sources/test_suite/input.c
[generic] 26 26 100.0% -lh0- 7f49 Dec 15 2003 vmwcc-0.1.7/sources/test_suite/input.test1
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[generic] 1274 6077 21.0% -lh5- 55b2 Jul 18 2004 vmwcc-0.1.7/sources/test_suite/Makefile
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