It uses PCRE2 to parse the C file and match a huge regex composed of several .regex files stitched together one Perl script (main.pl). There are about 94 currently callouts placed inside it which invoke C++ code that reads named capture groups and calls
the LLVM APIs appropriately to construct a program.

https://github.com/6a4h8/cparser2/tree/wip

This is an open source compiler using regular expressions and mainly focusing on the C89 (from fips pub 160 pdf document).



The backend was originally a huge C switch which I recently converted into C++ virtual functions - there are two pair of them - one for parsing - they can alter the match and one for producing.

The parsing one is mainly used for typedefs since they require context sensitive parsing inside functions.

Currently it doesn't implement: initialization, WIP on implementing conditional evaluation with the logical ops, incomplete types, un-prototyped functions.

Most importantly it doesn't support attributes and preprocessor directives.

It does implement: everything else hopefully.

Check out the WIP branch (lastly worked on Windows). Invocation:

cparser main.pl in_src.c

Expected output (llvm bitcode and IR representation):

in_src.c.bc
in_src.c.ll

It can be debugged if you uncomment the ending of line 6 in main.h. This will produce 2 output.txt files and significantly slow down the compilation process.

--- SoupGate-Win32 v1.05
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Absolute mad lad. I love it. I will have to give it a try later to see how all it works.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Monday, June 12, 2023 at 10:46:16 AM UTC+3, sasho648 wrote:

On Monday, June 12, 2023 at 8:55:35 AM UTC+3, Benjamin Williams (Hodgez) wrote:

Absolute mad lad. I love it. I will have to give it a try later to see how all it works.

Just FYI - it's on https://github.com/AnFunctionArray/cllvmbackend on now (with git submodule - the actual perl/regex part). I guess on the "mad lad" part you'll be happy to hear that this version is also multithreaded (because it turned out (last time

- I've not checked out the last perl updates) that this way was actually faster - with the bottleneck otherwise being the regex engine) - you need this evn vars:

MAXTHREADS=8
MINLEN=50000
SILENT=1

Otherwise the syntax is the same:

regularc ./parse.pl ./bulk/tests/test.c

But also generally last time it had some issues (since I was trying it for different purposes (for which there is the non standard INTPROM env var)). However I also had success compiling the c donut program with slight modifications (mainly removed the

preprocessor - line concatenation and comments) at certain point in the past. Faster - that's for **very large** files - otherwise it's the same.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Monday, June 12, 2023 at 8:55:35 AM UTC+3, Benjamin Williams (Hodgez) wrote:

Absolute mad lad. I love it. I will have to give it a try later to see how all it works.

Just FYI - it's on https://github.com/AnFunctionArray/cllvmbackend on now (with git submodule - the actual perl/regex part). I guess on the "mad lad" part you'll be happy to hear that this version is also multithreaded (because it turned out (last time -
I've not checked out the last perl updates) that this way was actually faster - with the bottleneck otherwise being the regex engine) - you need this evn vars:

MAXTHREADS=8
MINLEN=50000
SILENT=1

Otherwise the syntax is the same:

regularc ./parse.pl ./bulk/tests/test.c

But also generally last time it had some issues (since I was trying it for different purposes (for which there is the non standard INTPROM env var)). However I also had success compiling the c donut program with slight modifications (mainly removed the
preprocessor - line concatenation and comments) at certain point in the past.

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)