prepare_bindings.py: enable static bindings

Added a new flag, --allow-static-binding.  When specified,
if (and only if) the swig binary cannot be found, then the
LLDBWrapPython.cpp and lldb.py from the
scripts/Python/{static-binding-dir} are copied into the place where
swig would have generated them.

{static-binding-dir} defaults to static-binding, and can be
overridden with the --static-binding-dir command line argument.

The static bindings checked in are from r253424.

llvm-svn: 253448

1 files changed, 50 insertions, 7 deletions

diff --git a/lldb/scripts/Python/prepare_binding_Python.py b/lldb/scripts/Python/prepare_binding_Python.py
index 1996841baf1..6dbc94ea9d1 100644
--- a/lldb/scripts/Python/prepare_binding_Python.py
+++ b/lldb/scripts/Python/prepare_binding_Python.py
@@ -251,6 +251,42 @@ def do_swig_rebuild(options, dependency_file, config_build_dir, settings):
             sys.exit(-10)
 
 
+def copy_static_bindings(options, config_build_dir, settings):
+    """Copies the static Python bindings over to the build dir.
+    """
+
+    # Copy the LLDBWrapPython.cpp C++ binding file impl over.
+    lldb_wrap_python_src_path = os.path.join(
+        options.src_root,
+        "scripts",
+        "Python",
+        options.static_binding_dir,
+        "LLDBWrapPython.cpp")
+    if not os.path.exists(lldb_wrap_python_src_path):
+        logging.error(
+            "failed to find static Python binding .cpp file at '%s'",
+            lldb_wrap_python_src_path)
+        sys.exit(-12)
+    shutil.copyfile(lldb_wrap_python_src_path, settings.output_file)
+
+    # Copy the lldb.py impl over.
+    lldb_py_src_path = os.path.join(
+        options.src_root,
+        "scripts",
+        "Python",
+        options.static_binding_dir,
+        "lldb.py")
+    if not os.path.exists(lldb_py_src_path):
+        logging.error(
+            "failed to find static Python binding .py file at '%s'",
+            lldb_py_src_path)
+        sys.exit(-13)
+    lldb_py_dest_path = os.path.join(
+        os.path.dirname(settings.output_file),
+        "lldb.py")
+    shutil.copyfile(lldb_py_src_path, lldb_py_dest_path)
+
+
 def run_python_script(script_and_args):
     """Runs a python script, logging appropriately.
 
@@ -418,14 +454,21 @@ def main(options):
             "Skipping Python binding generation: everything is up to date")
         return
 
-    # Generate the Python binding with swig.
-    logging.info("Python binding is out of date, regenerating")
-    do_swig_rebuild(options, dependency_file, config_build_dir, settings)
-    if options.generate_dependency_file:
-        return
+    # Generate the Python binding with swig, or use the static bindings if no swig.
+    if not options.swig_executable or not os.path.exists(options.swig_executable):
+        # Copy over the static bindings.  We capture the the modified (i.e. post-processed)
+        # binding, so we don't do the modify step here - the modifications have
+        # already been applied.
+        copy_static_bindings(options, config_build_dir, settings)
+    else:
+        # Generate the bindings with swig.
+        logging.info("Python binding is out of date, regenerating")
+        do_swig_rebuild(options, dependency_file, config_build_dir, settings)
+        if options.generate_dependency_file:
+            return
 
-    # Post process the swig-generated file.
-    do_modify_python_lldb(options, config_build_dir)
+        # Post process the swig-generated file.
+        do_modify_python_lldb(options, config_build_dir)
 
 
 # This script can be called by another Python script by calling the main()