From 3083cf126cf3989b257546aa3b1b69608aac7923 Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Sat, 6 Aug 2022 05:25:16 +0200
Subject: sizeof

---
 bootstrap/all.h    |  1 +
 bootstrap/parse.c  | 11 +++++++++++
 bootstrap/test.cff |  4 ++++
 3 files changed, 16 insertions(+)

(limited to 'bootstrap')

diff --git a/bootstrap/all.h b/bootstrap/all.h
index 33ac7e7..15f932c 100644
--- a/bootstrap/all.h
+++ b/bootstrap/all.h
@@ -48,6 +48,7 @@ struct span {
    _(not)                \
    _(or)                 \
    _(return)             \
+   _(sizeof)             \
    _(static)             \
    _(struct)             \
    _(switch)             \
diff --git a/bootstrap/parse.c b/bootstrap/parse.c
index d55339d..4372cdc 100644
--- a/bootstrap/parse.c
+++ b/bootstrap/parse.c
@@ -922,6 +922,17 @@ pexprimary(struct parser *P) {
          ex = parsestructini(P, P->targty);
       else if (P->targty->t == TYarr)
          ex = parsearrini(P, P->targty);
+   } else if (lexmatch(P, &tok, TKkw_sizeof)) {
+      ex.t = Eintlit;
+      ex.ty = ty_usize;
+      if (lexmatch(P, &tok, '(')) {
+         struct expr exp = parseexpr(P);
+         ex.i = exp.ty->size;
+         lexexpect(P, ')');
+      } else {
+         const struct type *ty = parsetype(P);
+         ex.i = ty->size;
+      }
    } else {
       experr:
       fatal(P, tok.span, "expected expression (near %s)", tok2str(tok));
diff --git a/bootstrap/test.cff b/bootstrap/test.cff
index fb1741d..011d386 100644
--- a/bootstrap/test.cff
+++ b/bootstrap/test.cff
@@ -46,5 +46,9 @@ extern fn main (argc int, argv **u8) int {
       printf("%d\n", is[i]);
    } 
 
+   printf("sizeof(is) = %zu\n", sizeof(is));
+   printf("sizeof *void = %zu\n", sizeof *void);
+
+
    return 0;
 }
-- 
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