Copied the code from stack overflow without thinking about it. The
first byte in little endian order should always be LSB so I construct
a more contrived example (0xFFFF0000) which should make it easier to
detect what the first byte is considered on the machine. If it's 0
then the LSB is the first byte hence little endian, otherwise it's big
endian.
On a greater note: Don't never copy no code from stack overflow, bro.
I went up there at 11 o'clock last night trynna get me some code.
Bro, I copied that shit, woke up, my motherfucking LITTLE_ENDIAN
detection don't work. Explain, bro.
While it helped with understanding to use unions as a safe way to
access the underlying bits, this shift based mechanism actually makes
more sense at a glance, particularly by utilising WORD_NTH_BYTE
In particular, __LITTLE_ENDIAN__ was not a functioning macro.
Instead, I implemented a version by hand (copied from IBM) that
actually figures out if the machine is little endian or not.
Thank you unit testing!
This simple fix made the routine for OP_POP not require an additional
dispatch step on top of the conditional due to OPCODE_DATA_TYPE,
instead using data_type_t as a map from an opcode's base type to a
specific type.
Instead of using endian.h that is not portable AND doesn't work with
C++, I'll just write my own using a forced union based type punning
trick.
I've decided to use little endian for the format as well: it seems to
be used by most desktop computers so it should make these functions
faster to run for most CPUs.
Have to define _DEFAULT_SOURCE before you can use the endian
conversion functions. As most standard library headers use
features.h, and _DEFAULT_SOURCE must be defined before features.h is
included, we have to include base.h before other headers.
Anything other than char (which can just use print.byte to print the
hex) and byte (which prints hexes anyway), all other types may be
forced to print a hex rather than a number if PRINT_HEX is 1.
These new members are just signed versions of the previous members.
This makes type punning and usage for signed versions easier than
before (no need for memcpy).
