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

Age	Commit message (Collapse)	Author
2023-11-01	Added an arena allocator	Aryadev Chavali
	A page is a flexibly allocated structure of bytes, with a count of the number of bytes already allocated (used) and number of bytes available overall (available), with a pointer to the next page, if any. heap_t is a linked list of pages. One may allocate a requested size off the heap which causes one of two things: 1) Either a page already exists with enough space for the requested size, in which case that page's pointer is used as the base for the requested pointer 2) No pages satisfy the requested size, so a new page is allocated which is the new end of the heap.
2023-11-01	Introduced a new mathematical operator MULT	Aryadev Chavali
	Thankfully multiplication, like addition, is the same under 2s complement as it is for unsigned numbers. So I just need to implement those versions to be fine.
2023-11-01	Changed inst bytecode methods for new register system	Aryadev Chavali
	As registers may be theoretically infinite in number, we should use the largest size possible when referring to them in bytecode (a word).
2023-11-01	Set any new data allocated to 0 for clarity	Aryadev Chavali
	This is only new data allocated, so it's a very careful procedure.
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 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	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	Introduced signed versions of common types	Aryadev Chavali
	For each type T there is the signed version s_T
2023-10-31	Moved inst module to lib	Aryadev Chavali
	As it has no dependencies on vm specifically, and it's more necessary for any vendors who wish to target the virtual machine, it makes more sense for inst to be a lib module rather than a vm module.
2023-10-29	Added a "usage" message and colours for assembler	Aryadev Chavali
	Prints useful and pretty messages when verbose being at least 1.
2023-10-29	Auto-fill copyright notice in examples/fib.c	Aryadev Chavali

2023-10-28	Added macro to do safe subtractions on a word	Aryadev Chavali
	Default C just lets overflows occur for subtraction, so this macro will default to 0 if the subtraction causes an overflow.
2023-10-26	Moved base functions from inst.c to dedicated file	Aryadev Chavali
	Doesn't make sense for them to be in the VM module when they have a more general purpose now.
2023-10-24	Removed assertion in darr_read_file	Aryadev Chavali
	If an empty file is read, we want to deal with it in later user code rather than just failing immediately.
2023-10-23	Added lib folder for general stuff, introduced as target to Makefile	Aryadev Chavali