Set types as attributes on the cstruct object

[Schamper]

Closes #113

Some micro benchmarks:

from dissect.cstruct import cstruct

cdef = """
#define X 512

enum MyEnum {
    A,
    B,
    C
};

struct test {
    uint32 a;
};
"""
cs = cstruct()
cs.load(cdef)

Before:

In: %timeit getattr(t.cs, "X")
58.1 ns ± 1.04 ns per loop (mean ± std. dev. of 7 runs, 10,000,000 loops each)

In: %timeit getattr(t.cs, "MyEnum")
227 ns ± 0.912 ns per loop (mean ± std. dev. of 7 runs, 1,000,000 loops each)

In: %timeit getattr(t.cs, "test")
219 ns ± 1.47 ns per loop (mean ± std. dev. of 7 runs, 1,000,000 loops each)

After:

In: %timeit getattr(t.cs, "X")
31.2 ns ± 0.0331 ns per loop (mean ± std. dev. of 7 runs, 10,000,000 loops each)

In: %timeit getattr(t.cs, "MyEnum")
33.1 ns ± 0.0884 ns per loop (mean ± std. dev. of 7 runs, 10,000,000 loops each)

In: %timeit getattr(t.cs, "test")
31.3 ns ± 0.0571 ns per loop (mean ± std. dev. of 7 runs, 10,000,000 loops each)

[codecov]

Codecov Report

❌ Patch coverage is 82.35294% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.91%. Comparing base (194b1b5) to head (c9c24e2).

Files with missing lines	Patch %	Lines
dissect/cstruct/tools/stubgen.py	68.00%	8 Missing ⚠️
dissect/cstruct/cstruct.py	93.10%	2 Missing ⚠️
dissect/cstruct/parser.py	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
- Coverage   93.01%   92.91%   -0.11%     
==========================================
  Files          21       21              
  Lines        2435     2470      +35     
==========================================
+ Hits         2265     2295      +30     
- Misses        170      175       +5     

Flag	Coverage Δ
unittests	92.91% <82.35%> (-0.11%)	⬇️

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[Miauwkeru]

Some initial remarks with these changes, some projects fail to build:

• dissect.executable fails because it cannot find the Elf_type. My assumption is because at https://github.com/fox-it/dissect.executable/blob/01df4c2e66227e7f084b98c5c2b97f0b40a8d4f5/dissect/executable/elf/c_elf.py#L396 the types dict doesn't get copied.
• dissect.shellitem fails because the code checks whether something is inside the typedefs which now moved to types: https://github.com/fox-it/dissect.shellitem/blob/16bf53da8d5a31bee57e6788a54b04e761d55108/dissect/shellitem/lnk/lnk.py#L76
• dissect.target: jumplist also fails because of the shellitem issue.

[Miauwkeru]

Suggested change

	if not replace and (name in self.__dict__ and self.__dict__[name] != value):
	if not replace and (self.__dict__.get(name) != value):

Or is the overhead of the function call higher?

[Miauwkeru]

There is an issue on L174/L185 where it now generates structures multiple times due to looking into typedefs instead of types