[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- removed all the unit tests (most were outdated)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, 50 deletions

diff --git a/src/modules/ast/ir.scm b/src/modules/ast/ir.scm
deleted file mode 100644
index 50e9e29..0000000
--- a/src/modules/ast/ir.scm
+++ /dev/null
@@ -1,50 +0,0 @@
-(define-module (ast ir)
-  #:export (prog
-            srout
-            neg
-            not
-            mov
-            stack
-            reg
-            imm
-            tmp
-            ret))
-
-;;; Commentary:
-;;;
-;;; Nodes which exist to do nothing when evaluated.
-;;;
-;;; Code:
-
-(define (ir-node type . args)
-  (cons type args))
-
-(define (prog func)
-  (ir-node 'prog func))
-
-(define (srout label instrs)
-  (ir-node 'srout label instrs))
-
-(define (neg dst)
-  (ir-node 'neg dst))
-
-(define (not dst)
-  (ir-node 'not dst))
-
-(define (mov src dst)
-  (ir-node 'mov src dst))
-
-(define (stack val)
-  (ir-node 'stack val))
-
-(define (reg val)
-  (ir-node 'reg val))
-
-(define (imm val)
-  (ir-node 'imm val))
-
-(define (tmp num)
-  (ir-node 'tmp num))
-
-(define (ret)
-  (ir-node 'ret))