I was coding earlier this week, but my brain was so foggy I ended up not
knowing what I was doing. After a few days break, I've cleaned up the
mess, which took hours.
Changes:
* Variables can be assigned
* Added new value types as placeholders
* Added 'compare' and 'assign' to the AST
* Added duplicate opcode
* Added functions to copy and free values
* Max name length is 255 chars
* Compound assigns are squeezed into one word
To be completed:
* Tests for this commit's changes
* Compound assignments
* Variable access
Strings, due to their potentially large size, are stored outside of a
routine's code section, in the data section. To access the correct
string, you must read the jump index, then the real address from the
jump table - and extra layer of indirection will result in more flexible
data down the road, I hope.
Other changes include:
* Added string concat operator ..
* Added TOY_STRING_MAX_LENGTH
* Strings can't be created or concatenated longer than the max length
* The parser will display a warning if the bucket is too small for a
string at max length, but it will continue
* Added TOY_BUCKET_IDEAL to correspend with max string length
* The bucket now allocates an address that is 4-byte aligned
* Fixed missing entries in the parser rule table
* Corrected some failing TOY_BITNESS tests
The following structures are now more independant:
- Toy_Array
- Toy_Stack
- Toy_Bucket
- Toy_String
I reworked a lot of the memory allocation, so now there are more direct
calls to malloc() or realloc(), rather than relying on the macros from
toy_memory.h.
I've also split toy_memory into proper array and bucket files, because
it makes more sense this way, rather than having them both jammed into
one file. This means the eventual hashtable structure can also stand on
its own.
Toy_Array is a new wrapper around raw array pointers, and all of the
structures have their metadata embedded into their allocated memory now,
using variable length array members.
A lot of 'capacity' and 'count' variables were changed to 'size_t'
types, but this doesn't seem to be a problem anywhere.
If the workflow fails, then I'll leave it for tonight - I'm too tired,
and I don't want to overdo myself.
Strings are needed for the handling of identifiers in the key/value
variable storage, so I've got them working first. I used the rope
pattern, which seems to be quite an interesting approach.
I'll add comparison checks later.
Adjusted how buckets are handled in all tests, could've been an issue
down the line.
Added the build instructions to README.md.
At this point, only a minimal number of operations are working, and
after running any kind of source code, the 'result' is simply left on
the VM's stack. Still, it's awesome to see it reach this point.
The tests are failing in a strange way, with the error message 'corrupted top size'. I don't know what it means, and it seems to be caused by a call to printf() within 'test_bytecode.c'. I need a break, as this is making me dizzy.
