From 38942c34a497a4c6edf080dc64440c1bc486fc46 Mon Sep 17 00:00:00 2001
From: Elis Eriksson <spelis@spelis.li>
Date: Sat, 20 Jun 2026 20:12:29 +0200
Subject: Pattern matching optimizer and more

it's not the best optimizer but it works.
Also added a -ast_dump flag which dumps the AST to stderr.
Also input is now done in raw mode just because it can be.
---
 src/bfc.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 51 insertions(+), 10 deletions(-)

(limited to 'src/bfc.c')

diff --git a/src/bfc.c b/src/bfc.c
index fc7d29d..8ef8d3d 100644
--- a/src/bfc.c
+++ b/src/bfc.c
@@ -1,12 +1,25 @@
 #include "all.h"
 #include "str.h"
+#include <stdbool.h>
 #include <stdio.h>
 #include <string.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
 
-int main(void) {
+int main(int argc, char *argv[]) {
+  bool dump_c = false;
+  bool dump_ast = false;
+
+  for (int i = 1; i < argc; i++) {
+    if (strcmp("-cdump", argv[i]) == 0) {
+      dump_c = true;
+    }
+    if (strcmp("-ast_dump", argv[i]) == 0) {
+      dump_ast = true;
+    }
+  }
+
   str input = {0};
   str_append_fread(&input, stdin);
 
@@ -18,8 +31,14 @@ int main(void) {
   // Run the parser and turn tokens into an AST representation
   parser_t p = parser_init(&lexer);
   ast_node_t *ast = parse_program(&p);
+  ast = optimize_ast(ast);
+  if (dump_ast)
+    ast_dump(ast, 0);
   str c_code = gen_code(ast);
 
+  if (dump_c)
+    fprintf(stderr, "%s\n", c_code.data);
+
   // Run gcc
   int fd[2];
   pipe(fd);
@@ -29,14 +48,23 @@ int main(void) {
     close(fd[0]);
     close(fd[1]);
 
-    char *argv[] = {"gcc",       "-Os",
-                    "-flto",     "-fuse-linker-plugin",
-                    "-DNDEBUG",  "-fomit-frame-pointer",
-                    "-nostdlib", "-nostartfiles",
-                    "-no-pie",   "-fno-stack-protector",
-                    "-o",        "/proc/self/fd/1",
-                    "-x",        "c",
-                    "-",         NULL};
+    char *argv[] = {"gcc",
+                    "-Os",
+                    "-flto",
+                    "-fuse-linker-plugin",
+                    "-DNDEBUG",
+                    "-fomit-frame-pointer",
+                    "-nostdlib",
+                    "-nostartfiles",
+                    "-ffreestanding",
+                    "-no-pie",
+                    "-fno-stack-protector",
+                    "-o",
+                    "/proc/self/fd/1",
+                    "-x",
+                    "c",
+                    "-",
+                    NULL};
 
     execvp("gcc", argv);
     perror("execvp");
@@ -47,7 +75,20 @@ int main(void) {
   close(fd[0]);
   write(fd[1], c_code.data, strlen(c_code.data));
   close(fd[1]);
-  wait(NULL);
+  int status;
+  wait(&status);
+
+  if (WIFEXITED(status)) {
+    int code = WEXITSTATUS(status);
+    if (code != 0) {
+      fprintf(stderr, "GCC failed with exit code %d\n", code);
+      fprintf(stderr, "Dumping C code:\n%s\n", c_code.data);
+    }
+  } else if (WIFSIGNALED(status)) {
+    fprintf(stderr, "GCC killed by signal %d\n", WTERMSIG(status));
+  } else {
+    fprintf(stderr, "GCC died in an unknown and mysterious way\n");
+  }
 
   ast_free(ast);
   free_str(&input);
-- 
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