ovm - ARCHIVED - A stack based virtual machine to act as a target for other programming languages

Age	Commit message (Collapse)	Author
2023-11-01	Implement OP_MULT in runtime	Aryadev Chavali
	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.
2023-11-01	Fixed bug with comparators where all results were flipped	Aryadev Chavali
	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.
2023-11-01	Added a routine to cleanup resources allocated to the VM	Aryadev Chavali
	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.
2023-11-01	VM registers are now a dynamic array	Aryadev Chavali
	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.
2023-11-01	Clearer VERBOSE messages	Aryadev Chavali

2023-11-01	Removed OP_EQ signed versions as they're useless	Aryadev Chavali
	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.
2023-10-31	Added new macro for bitwise comparison construction	Aryadev Chavali
	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.
2023-10-31	Added flag which forces the printing of hexes	Aryadev Chavali
	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.
2023-10-31	Use macros to stop duplication of code	Aryadev Chavali
	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.
2023-10-31	Introduced 3 new union members to data_t	Aryadev Chavali
	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).
2023-10-31	Remove duplicated code	Aryadev Chavali

2023-10-31	Implemented all the comparators	Aryadev Chavali
	So much reused code, I definitely need to find a way to make this cleaner.
2023-10-31	Use standardised signed version of word type from base.h	Aryadev Chavali

2023-10-31	Implemented new types of EQ, forced all comparators to push bytes	Aryadev Chavali
	Just need to call their unsigned versions. All comparators should push bytes as it makes return types uniform.
2023-10-31	vm_execute_all: Print every cycle on VERBOSE >= 2, just print final state ↵	Aryadev Chavali
	otherwise Changed VERBOSE checks to ensure a degree of information.
2023-10-31	Created routines for new comparator opcodes (not implemented)	Aryadev Chavali
	Will cause error if used currently, which is fine.
2023-10-23	src->vm, Makefile is now a bit more abstracted and pretty colours	Aryadev Chavali
	Changed folder names for sake of clarity (will be introducing a new build target soon), and Makefile can now easily support more targets.