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Pretty simple, required some new types of errors. Obviously there's
space for a macro for the differing instruction implementations, but
these things need to be tested a bit more before I can do that.
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As PUSH_REGISTER and MOV have the same signature of taking a word as
input, DUP may as well be part of it.
This leads to a larger discussion about how signatures of functions
matter: I may need to do a cleanup at some point.
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Now need to create some instructions which manage the heap
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word register 0 refers to the first 8 bytes of the dynamic array.
Hence the used counter should be at least 8 bytes. This deals with
those issues. Also print more useful information in
vm_print_registers (how many byte|hword|word registers are currently
in use, how many are available).
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Lucky surprise: OP_PLUS follows the same principle rules as the
bitwise operators in that they return the same type as the input.
Therefore I can simply use the same macro to implement it and MULT as
those. Very nice.
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This is because: say we have {a, b} where a is on top of the stack. A
comparator C applies in the order C(b, a) i.e. b `C` a. The previous
version did a `C` b which was wrong.
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This means the stack should be heap allocated, which makes sense as
beyond 1KB one should really be using the heap rather than the stack.
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Stack based machines generally need "variable space". This may be
quite via a symbol-to-word association a list, a hashmap, or some
other system. Here I decide to go for the simplest: extending the
register system to a dynamic/infinite number of them. This means, in
practice, that we may use a theoretically infinite number of indexed
words, hwords and bytes to act as variable space. This means that the
onus is on those who are targeting this virtual machine to create
their own association system to create syntactic variables: all the
machinery is technically installed within the VM, without the veneer
that causes extra cruft.
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A negative number under 2s complement can never be equal to its
positive as the top bit *must* be on. If two numbers are equivalent
bit-by-bit then they are equal for both signed and unsigned numbers.
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This pushes a datum of the same type as the operands, which is why it
cannot use the comparator macro as that always pushes bytes.
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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.
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I've made a single macro which defines a function through some common
metric, removing code duplication. Not particularly readable per se,
but using a macro expansion in your IDE allows one to inspect the code.
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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).
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So much reused code, I definitely need to find a way to make this cleaner.
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Just need to call their unsigned versions.
All comparators should push bytes as it makes return types uniform.
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otherwise
Changed VERBOSE checks to ensure a degree of information.
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Will cause error if used currently, which is fine.
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Changed folder names for sake of clarity (will be introducing a new
build target soon), and Makefile can now easily support more targets.
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