Parse and display exception table

[whoami730]

Parses and displays Exception Table starting Py 3.11+
This is required for supporting new "zero-cost" exception handling mechanism.

Sample file -

$ cat try_except.py
try:
    x = 1 / 0
except ZeroDivisionError as e:
    print(f"Caught an exception: {e}")
finally:
    print("Finally clause executed")

Disassembly by pycdas for py 3.12 compilation -

$ ./pycdas __pycache__/try_except.cpython-312.pyc
try_except.cpython-312.pyc (Python 3.12)
[Code]
    File Name: try_except.py
    Object Name: <module>
    Qualified Name: <module>
    Arg Count: 0
    Pos Only Arg Count: 0
    KW Only Arg Count: 0
    Stack Size: 5
    Flags: 0x00000000
    [Names]
        'x'
        'ZeroDivisionError'
        'e'
        'print'
    [Locals+Names]
    [Constants]
        1
        0
        'Caught an exception: '
        None
        'Finally clause executed'
    [Disassembly]
        0       RESUME                          0
        2       NOP
        4       LOAD_CONST                      0: 1
        6       LOAD_CONST                      1: 0
        8       BINARY_OP                       11 (/)
        12      STORE_NAME                      0: x
        14      PUSH_NULL
        16      LOAD_NAME                       3: print
        18      LOAD_CONST                      4: 'Finally clause executed'
        20      CALL                            1
        28      POP_TOP
        30      RETURN_CONST                    3: None
        32      PUSH_EXC_INFO
        34      LOAD_NAME                       1: ZeroDivisionError
        36      CHECK_EXC_MATCH
        38      POP_JUMP_IF_FALSE               21 (to 82)
        40      STORE_NAME                      2: e
        42      PUSH_NULL
        44      LOAD_NAME                       3: print
        46      LOAD_CONST                      2: 'Caught an exception: '
        48      LOAD_NAME                       2: e
        50      FORMAT_VALUE                    0 (FVC_NONE)
        52      BUILD_STRING                    2
        54      CALL                            1
        62      POP_TOP
        64      POP_EXCEPT
        66      LOAD_CONST                      3: None
        68      STORE_NAME                      2: e
        70      DELETE_NAME                     2: e
        72      JUMP_BACKWARD                   30 (to 14)
        74      LOAD_CONST                      3: None
        76      STORE_NAME                      2: e
        78      DELETE_NAME                     2: e
        80      RERAISE                         1
        82      RERAISE                         0
        84      COPY                            3
        86      POP_EXCEPT
        88      RERAISE                         1
        90      PUSH_EXC_INFO
        92      PUSH_NULL
        94      LOAD_NAME                       3: print
        96      LOAD_CONST                      4: 'Finally clause executed'
        98      CALL                            1
        106     POP_TOP
        108     RERAISE                         0
        110     COPY                            3
        112     POP_EXCEPT
        114     RERAISE                         1
    [Exception Table]
        4 to 14 -> 32 [0]
        32 to 42 -> 84 [1] lasti
        42 to 64 -> 74 [1] lasti
        64 to 74 -> 90 [0]
        74 to 84 -> 84 [1] lasti
        84 to 90 -> 90 [0]
        90 to 110 -> 110 [1] lasti

[whoami730]

NOTE - I am trying to look into new "zero-cost" exception handling decompilation support but it's honestly quite hard and we have lots of old code which is harder to understand as well, I am not sure if I will be able to do much but I shall try atleast.