add compile command

Author: varun-r-mallya

examples/execve3.py

@@ -1,25 +1,25 @@
-from pythonbpf.decorators import bpf, map, section, bpfglobal
-from ctypes import c_void_p, c_int64, c_int32, c_uint64
+import pythonbpf as pb
 from pythonbpf.helpers import bpf_ktime_get_ns
 from pythonbpf.maps import HashMap
 
+from ctypes import c_void_p, c_int64, c_int32, c_uint64
 
-@bpf
-@map
+@pb.bpf
+@pb.map
 def last() -> HashMap:
     return HashMap(key_type=c_uint64, value_type=c_uint64, max_entries=1)
 
 
-@bpf
-@section("tracepoint/syscalls/sys_enter_execve")
+@pb.bpf
+@pb.section("tracepoint/syscalls/sys_enter_execve")
 def hello(ctx: c_void_p) -> c_int32:
     print("entered")
     print("multi constant support")
     return c_int32(0)
 
 
-@bpf
-@section("tracepoint/syscalls/sys_exit_execve")
+@pb.bpf
+@pb.section("tracepoint/syscalls/sys_exit_execve")
 def hello_again(ctx: c_void_p) -> c_int64:
     print("exited")
     key = 0
@@ -34,7 +34,9 @@ def hello_again(ctx: c_void_p) -> c_int64:
     return c_int64(0)
 
 
-@bpf
-@bpfglobal
+@pb.bpf
+@pb.bpfglobal
 def LICENSE() -> str:
     return "GPL"
+
+pb.compile()

pythonbpf/__init__.py

@@ -0,0 +1,2 @@
+from .decorators import bpf, map, section, bpfglobal
+from .codegen import compile_to_ir, compile

pythonbpf/codegen.py

@@ -5,7 +5,9 @@
 from .maps_pass import maps_proc
 from .globals_pass import globals_processing
 import os
-
+import subprocess
+import pathlib
+import __main__
 
 def find_bpf_chunks(tree):
     """Find all functions decorated with @bpf in the AST."""
@@ -92,3 +94,18 @@ def compile_to_ir(filename: str, output: str):
         f.write("\n")
 
     return output
+
+def compile():
+    main_file = pathlib.Path(__main__.__file__).resolve()
+
+    ll_file = pathlib.Path("/tmp") / main_file.with_suffix(".ll").name
+    o_file = main_file.with_suffix(".o")
+
+    compile_to_ir(str(main_file), str(ll_file))
+
+    subprocess.run([
+        "llc", "-march=bpf", "-filetype=obj", "-O2",
+        str(ll_file), "-o", str(o_file)
+    ], check=True)
+
+    print(f"Object written to {o_file}")