add tools to split and merge asm modules from the surrounding code

1 files changed, 30 insertions, 0 deletions

diff --git a/tools/split_asm.py b/tools/split_asm.py
new file mode 100755
index 00000000..39eaca00
--- /dev/null
+++ b/tools/split_asm.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python2
+
+'''
+Splits a compiler outputted program into the asm module and the surrounding shell. This
+can be useful if you want to process the shell in some manner (e.g. minifiy it) in ways
+that would be harmful to asm.js code.
+'''
+
+import sys
+import shared
+from asm_module import AsmModule
+
+try:
+  me, infile, out_shell, out_asm = sys.argv[:4]
+except:
+  print >> sys.stderr, 'usage: emlink.py [input file] [shell output file] [asm output file]'
+  sys.exit(1)
+
+print 'Input file:', infile
+print 'Shell output:', out_shell
+print 'Asm output:', out_asm
+
+shared.try_delete(out_shell)
+shared.try_delete(out_asm)
+
+module = AsmModule(infile)
+
+open(out_shell, 'w').write(module.pre_js + '\n// ASM_CODE\n' + module.post_js)
+open(out_asm, 'w').write(module.asm_js)
+