[Ongoing] Rewrite frontend to use Flex/Bison

This is a merge of another experiment, so the changes are large:

- separated "modules" directory into frontend/backend
  - adjusted module names and moved files for this to happen
- removed modules lexer & parser
- removed all the unit tests (most were outdated)
- added Bison, flex, and C development tools to manifest.scm
- added lexer.l, a source file used by the flex utility with a functioning lexing implementation
- added parser.y, a source file used by the bison utility with a functioning parser implementation
- added node.c and node.h, which parser.y uses to construct an AST of a C source file (up to binary ops)
- added driver.c, a Guile-C interface that provides a module to scheme programs
- added a Makefile to make all of this
- added stuff to .gitignore

1 files changed, 0 insertions, 23 deletions

diff --git a/src/modules/generator/expansion.scm b/src/modules/generator/expansion.scm
deleted file mode 100644
index 5bfa878..0000000
--- a/src/modules/generator/expansion.scm
+++ /dev/null
@@ -1,23 +0,0 @@
-(define-module (generator expansion)
-  #:use-module (ast ir)
-  #:use-module (utils merge-instructions)
-  #:export (instrs
-            not
-            neg
-            ret))
-
-
-(define (instrs lst)
-  #f
-  (list 'instrs (cons 'list (merge-instr lst))))
-
-(define (not src dst) (unary 'not src dst))
-(define (neg src dst) (unary 'neg src dst))
-
-(define (ret src)
-  (list (list 'mov src (list 'reg "eax"))
-        (list 'ret)))
-
-(define (unary op src dst)
-  (list (list 'mov src dst)
-        (list op dst)))