hare

commit aeb2be7e9f8400d788483e76db517d42020fa8c0
parent 7b2866d036812a92ad614f5d9b98cac26dc1303c
Author: Drew DeVault <sir@cmpwn.com>
Date:   Sat, 30 Jan 2021 15:16:16 -0500

os: use static argument array if possible

Diffstat:
M
os/+linux/environ.ha
 | 
13
+++++++++++--

1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/os/+linux/environ.ha b/os/+linux/environ.ha
@@ -6,9 +6,18 @@ use types;
 // member is usually the name of the program.
 export let args: []str = [];
 
+// Statically allocate arg strings if there are few enough arguments, saves a
+// syscall if we don't need it.
+let args_static: [32]str = [""...];
+
 @init fn init() void = {
-	args = alloc([]str, [], rt::argc);
-	(&args: *types::slice).length = rt::argc; // HORRIBLE HACK
+	if (rt::argc < len(args_static)) {
+		args = args_static[..rt::argc];
+	} else {
+		args = alloc([]str, [], rt::argc);
+		(&args: *types::slice).length = rt::argc; // HORRIBLE HACK
+	};
+
 	for (let i = 0z; i < rt::argc; i += 1z) {
 		args[i] = strings::from_c(rt::argv[i]);
 	};