Add .clang-format and reformat.

.clang-format

@@ -0,0 +1,3 @@
+---
+BasedOnStyle: LLVM
+AllowShortFunctionsOnASingleLine: false

gen_ir.c

@@ -34,9 +34,17 @@ static IR *add_imm(int op, int lhs, int rhs) {
   return ir;
 }
 
-static void kill(int r) { add(IR_KILL, r, -1); }
-static void label(int x) { add(IR_LABEL, x, -1); }
-static void jmp(int x) { add(IR_JMP, x, -1); }
+static void kill(int r) {
+  add(IR_KILL, r, -1);
+}
+
+static void label(int x) {
+  add(IR_LABEL, x, -1);
+}
+
+static void jmp(int x) {
+  add(IR_JMP, x, -1);
+}
 
 static int gen_expr(Node *node);
 

main.c

@@ -1,6 +1,8 @@
 #include "9cc.h"
 
-void usage() { error("Usage: 9cc [-test] [-dump-ir1] [-dump-ir2] <file>"); }
+void usage() {
+  error("Usage: 9cc [-test] [-dump-ir1] [-dump-ir2] <file>");
+}
 
 int main(int argc, char **argv) {
   if (argc == 1)

parse.c

@@ -70,9 +70,17 @@ static Type *new_prim_ty(int ty, int size) {
   return ret;
 }
 
-static Type *void_ty() { return new_prim_ty(VOID, 0); }
-static Type *char_ty() { return new_prim_ty(CHAR, 1); }
-static Type *int_ty() { return new_prim_ty(INT, 4); }
+static Type *void_ty() {
+  return new_prim_ty(VOID, 0);
+}
+
+static Type *char_ty() {
+  return new_prim_ty(CHAR, 1);
+}
+
+static Type *int_ty() {
+  return new_prim_ty(INT, 4);
+}
 
 static bool consume(int ty) {
   Token *t = tokens->data[pos];

preprocess.c

@@ -46,14 +46,18 @@ static void append(Vector *v) {
     vec_push(ctx->output, v->data[i]);
 }
 
-static void add(Token *t) { vec_push(ctx->output, t); }
+static void add(Token *t) {
+  vec_push(ctx->output, t);
+}
 
 static Token *next() {
   assert(ctx->pos < ctx->input->len);
   return ctx->input->data[ctx->pos++];
 }
 
-static bool eof() { return ctx->pos == ctx->input->len; }
+static bool eof() {
+  return ctx->pos == ctx->input->len;
+}
 
 static Token *get(int ty, char *msg) {
   Token *t = next();
@@ -67,7 +71,9 @@ static char *ident(char *msg) {
   return t->name;
 }
 
-static Token *peek() { return ctx->input->data[ctx->pos]; }
+static Token *peek() {
+  return ctx->input->data[ctx->pos];
+}
 
 static bool consume(int ty) {
   if (peek()->ty != ty)

sema.c

@@ -95,7 +95,9 @@ noreturn static void bad_node(Node *node, char *msg) {
   bad_token(node->token, msg);
 }
 
-static void warn_node(Node *node, char *msg) { warn_token(node->token, msg); }
+static void warn_node(Node *node, char *msg) {
+  warn_token(node->token, msg);
+}
 
 static void check_lval(Node *node) {
   int op = node->op;

util.c

@@ -85,7 +85,9 @@ void sb_add(StringBuilder *sb, char c) {
   sb->data[sb->len++] = c;
 }
 
-void sb_append(StringBuilder *sb, char *s) { sb_append_n(sb, s, strlen(s)); }
+void sb_append(StringBuilder *sb, char *s) {
+  sb_append_n(sb, s, strlen(s));
+}
 
 void sb_append_n(StringBuilder *sb, char *s, int len) {
   sb_grow(sb, len);
@@ -98,7 +100,9 @@ char *sb_get(StringBuilder *sb) {
   return sb->data;
 }
 
-int roundup(int x, int align) { return (x + align - 1) & ~(align - 1); }
+int roundup(int x, int align) {
+  return (x + align - 1) & ~(align - 1);
+}
 
 Type *ptr_to(Type *base) {
   Type *ty = calloc(1, sizeof(Type));