1 files changed, 39 insertions, 0 deletions
diff --git a/tools/exec_llvm.py b/tools/exec_llvm.py
new file mode 100755
index 00000000..05194b1a
--- /dev/null
+++ b/tools/exec_llvm.py
@@ -0,0 +1,39 @@
+'''
+Small utility to execute some llvm bitcode.
+
+The use case is a Makefile that builds some executable
+and runs it as part of the build process. With emmaken,
+the Makefile will generate llvm bitcode, so we can't
+just execute it directly. This script will get that
+code into a runnable form, and run it.
+
+We cannot just use lli, since code built with debug
+symbols will crash it due to
+
+  http://llvm.org/bugs/show_bug.cgi?id=6981
+
+So instead we compile the bitcode into native code.
+
+To use this, change the Makefile so that instead of
+running
+
+  /bin/sh THE_FILE PARAMS
+
+it runs
+
+  python $(EMSCRIPTEN_TOOLS)/exec_llvm.py THE_FILE PARAMS
+'''
+
+import os, sys
+from subprocess import Popen, PIPE, STDOUT
+
+abspath = os.path.abspath(os.path.dirname(__file__))
+def path_from_root(*pathelems):
+  return os.path.join(os.path.sep, *(abspath.split(os.sep)[:-1] + list(pathelems)))
+exec(open(path_from_root('tools', 'shared.py'), 'r').read())
+
+print 'EXEC_LLVM: ', sys.argv
+Popen([LLVM_COMPILER, '-march=c', sys.argv[1]]).communicate()[0]
+Popen(['gcc', sys.argv[1]+'.cbe.c']).communicate()[0]
+Popen(['./a.out'] + sys.argv[2:]).communicate()[0]
+