[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- removed all the unit tests (most were outdated)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, 34 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..de737ad
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,34 @@
+CC = gcc
+CFLAGS = -fPIC -Wall -Wextra -Wpedantic `pkg-config --cflags guile-3.0`
+LIBS = `pkg-config --libs guile-3.0`
+
+TARGET ?= libull.so
+
+SRCDIR := src/frontend
+OBJDIR := build
+
+SRCS = $(SRCDIR)/lexer.c $(SRCDIR)/parser.c $(SRCDIR)/node.c $(SRCDIR)/driver.c
+OBJS = $(OBJDIR)/driver.o $(OBJDIR)/lexer.o $(OBJDIR)/parser.o $(OBJDIR)/node.o
+
+all: $(TARGET)
+
+$(TARGET): $(OBJS)
+	$(CC) -shared -o $@ $^ $(LIBS)
+
+$(OBJS): $(OBJDIR)/%.o : $(SRCDIR)/%.c $(SRCDIR)/lexer.h $(SRCDIR)/parser.h | $(OBJDIR)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+$(SRCDIR)/lexer.h $(SRCDIR)/lexer.c: $(SRCDIR)/lexer.l
+	flex --header-file=$(SRCDIR)/lexer.h -o $(SRCDIR)/lexer.c $(SRCDIR)/lexer.l
+
+$(SRCDIR)/parser.h $(SRCDIR)/parser.c: $(SRCDIR)/parser.y
+	bison -d -v -o $(SRCDIR)/parser.c $(SRCDIR)/parser.y
+
+$(OBJDIR):
+	mkdir -p $(OBJDIR)
+
+clean:
+	rm -f $(OBJS) $(SRCDIR)/lexer.c $(SRCDIR)/lexer.h $(SRCDIR)/parser.c $(SRCDIR)/parser.h $(SRCDIR)/parser.output $(TARGET)
+
+
+.PHONY: all clean