| This file contains a collection of non-configurable limits: |
| |
| Program properties |
| ================== |
| * maximum program length: 1 MB (1048575 Bytes) |
| This is defined by FUNSTART_MASK in exec.h, which is the maximum offset |
| (address) of a functions code within the program block (relativ to the |
| beginning). Changing it involves changing funflag_t and probably other |
| stuff. |
| |
| * maximum number of programs: 2^32-1 |
| The unique program ID number is a int32. It is incremented for each compiled |
| program. If it reaches zero (after wrapping to negative values) the |
| compiler or swapper calls renumber_programs(), which recycles numbers from |
| old programs. |
| (exec.h, prolang.y, swap.c, ...) |
| |
| * maximum number of functions in a program: 65534 |
| The lookup table for function indexes holding the offsets of the function in |
| the functions tables is unsigned short. |
| The types of function arguments are stored in program_s.argument_types, |
| which is index by the unsigned short programs_s.type_start. 65535 has a |
| special meaning. Some code relies that this is unsigned short. |
| (exec.h, ...) |
| program_s.num_function_names and num_functions are unsigned short as well. |
| |
| * maximum length of switch: 256k (262143 Bytes) |
| Limited by BREAK_ADDRESS_MASK and CONTINUE_ADDRESS_MASK? |
| |
| * maximum offset for branches: 32765 (0x7ffd) |
| (prolang.y) |
| |
| * number of virtual variables: 256 |
| * number of global variables: 65536 (F_IDENTIFIER16) |
| * number of local variables: 256 (F_PUSH_LOCAL_VARIABLE_LVALUE) |
| * number of context variables: 256 (Should be consistent with local |
| variables, MAX_LOCAL applies to both. 16 bit opcodes are not used yet.) |
| |
| * max number of struct members: 255 |
| (exec.h, ...) |
| |
| * max number of structs per program: usually 32767 (short) |
| |
| |
| Hash tables |
| =========== |
| * maximum size of the hash table for identifiers (ITABLE): 32768 |
| The hashes of identifiers are signed short which are in most cases 16 bit |
| wide integers (lex.h, lex.c, ...) |
| |
| * maximum size of the hash table for objects (OTABLE): 65536 |
| * maximum size of the hash table for shared strings (HTABLE): 65536 |
| The hashes are of type unsigned short which are in most cases 16 bit |
| wide integers. |
| |
| |
| Objects |
| ======= |
| * maximum clone ID number: 2^32-1 |
| Not a real limitation, after that the driver starts checking if |
| blueprint name + #cloneid are unique. |
| |
| |
| Memory management |
| ================= |
| * max. size of single large block in slaballo.c and smalloc.c: |
| 0x07ffffff (134217727, defined by M_MASK) |
| |
| |
| Language |
| ======== |
| * maximum number of simul-efuns: 2048 |
| Only values 0xf800-0xffff in .x.closure_type of |
| a T_CLOSURE svalue are reserved for simul-efuns. |
| F_SIMUL_EFUN however takes a short int, so there 65536 |
| simul-efuns would be possible. |
| |
| * maximum number of python efuns: 2048 |
| Only values 0xe800-0xefff in .x.closure_type of |
| a T_CLOSURE svalue are reserved for python efuns. |
| F_PYTHON_EFUN however takes a short int, so there 65536 |
| python efuns would be possible. |