From e78735752024d73655e8538e165e735e19c41903 Mon Sep 17 00:00:00 2001
From: Dan Gohman <sunfish@mozilla.com>
Date: Tue, 20 Mar 2018 15:22:22 -0700
Subject: [PATCH] Wrap build.py's contents in a main function.

This prevents its local variables from becoming global variables.
---
 lib/cretonne/meta/build.py | 34 +++++++++++++++++++++-------------
 1 file changed, 21 insertions(+), 13 deletions(-)

diff --git a/lib/cretonne/meta/build.py b/lib/cretonne/meta/build.py
index a94b9ce706..8c83300604 100644
--- a/lib/cretonne/meta/build.py
+++ b/lib/cretonne/meta/build.py
@@ -14,19 +14,27 @@ import gen_legalizer
 import gen_registers
 import gen_binemit
 
-parser = argparse.ArgumentParser(description='Generate sources for Cretonne.')
-parser.add_argument('--out-dir', help='set output directory')
 
-args = parser.parse_args()
-out_dir = args.out_dir
+def main():
+    # type: () -> None
+    parser = argparse.ArgumentParser(
+            description='Generate sources for Cretonne.')
+    parser.add_argument('--out-dir', help='set output directory')
 
-isas = isa.all_isas()
+    args = parser.parse_args()
+    out_dir = args.out_dir
 
-gen_types.generate(out_dir)
-gen_instr.generate(isas, out_dir)
-gen_settings.generate(isas, out_dir)
-gen_encoding.generate(isas, out_dir)
-gen_legalizer.generate(isas, out_dir)
-gen_registers.generate(isas, out_dir)
-gen_binemit.generate(isas, out_dir)
-gen_build_deps.generate()
+    isas = isa.all_isas()
+
+    gen_types.generate(out_dir)
+    gen_instr.generate(isas, out_dir)
+    gen_settings.generate(isas, out_dir)
+    gen_encoding.generate(isas, out_dir)
+    gen_legalizer.generate(isas, out_dir)
+    gen_registers.generate(isas, out_dir)
+    gen_binemit.generate(isas, out_dir)
+    gen_build_deps.generate()
+
+
+if __name__ == "__main__":
+    main()