From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Date: Sat, 27 Dec 2014 23:39:47 +0000 (+0700)
Subject: attr: do not attempt to expand when we know it's not a macro
X-Git-Tag: v2.4.0-rc0~92^2~1
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/fad32bcd83ec4e4f88013e4a0b05f42e32e2c6f5?ds=inline;hp=fad32bcd83ec4e4f88013e4a0b05f42e32e2c6f5

attr: do not attempt to expand when we know it's not a macro

Keep track of all recognized macros in the new "maybe_macro" field.
If this field is true, it _may_ be a macro (depending on what's in the
current attr stack). But if the field is false, it's definitely not a
macro, no need to go through the whole attr stack in macroexpand_one()
to search for one.

Without this, "git grep abcdefghi" on git.git hits the inner loop in
macroexpand_one() 2481 times. With this, it's 66 times.

Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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