bytecode

I am doing an online bytecode method inlining optimization using ASM. My changes are based on the example 3.2.6 Inline Method ( http://asm.ow2.org/current/asm-transformations.pdf ). The test example (inline callee's calculate(int,int) at Caller::test) is: public class Caller { final Callee _callee; public Caller(Callee callee){ _callee = callee; } public static void main(String[] args) { new Caller(new Callee("xu", "shijie")).test(5, 100); } public void test(int a, int b){ int t = a; int p = b; int r = t+p-_callee.calculate(a, b); int m = t-p; System.out.println(t); } } public class Callee {

So I know that there exists 2 memory areas: Stack and Heap . I also know that if you create a local variable it will live in the Stack, not in the heap. Stack will grow as we push data into it as in: Now I will try to pass the confusion I am having to you: For example this simple Java Code: public class TestClass { public static void main(String[] args) { Object foo = null; Object bar = null; } } is translated into this byte code: public static void main(java.lang.String[]); Code: Stack=1, Locals=3, Args_size=1 0: aconst_null 1: astore_1 2: aconst_null 3: astore_2 4: return LineNumberTable:

Say I do: #!/usr/bin/env python # encoding: utf-8 class A(object): pass Now I disassemble it: python -m dis test0.py 4 0 LOAD_CONST 0 ('A') 3 LOAD_NAME 0 (object) 6 BUILD_TUPLE 1 9 LOAD_CONST 1 (<code object A at 0x1004ebb30, file "test0.py", line 4>) 12 MAKE_FUNCTION 0 15 CALL_FUNCTION 0 18 BUILD_CLASS 19 STORE_NAME 1 (A) 22 LOAD_CONST 2 (None) 25 RETURN_VALUE Now I add some statements in the class definition: #!/usr/bin/env python # encoding: utf-8 class A(object): print 'hello' 1+1 pass And I disassemble again: 4 0 LOAD_CONST 0 ('A') 3 LOAD_NAME 0 (object) 6 BUILD_TUPLE 1 9 LOAD_CONST 1 (

How would I generate a .pyc file from a Python AST such that I could import the file from Python? I've used compile to create a code object, then written the co_code attribute to a file, but when I try to import the file from Python, I get an ImportError: Bad magic number in output.pyc . exupero The solution can be adapted from the py_compile module: import marshal import py_compile import time import ast codeobject = compile(ast.parse('print "Hello World"'), '<string>', 'exec') with open('output.pyc', 'wb') as fc: fc.write('\0\0\0\0') py_compile.wr_long(fc, long(time.time())) marshal.dump