2.2 KiB
M2-Planet is subset of the C programming language.
Mostly eliminating features that have yet to be proven useful in building compilers, linkers or assemblers.
Global variables
Assignment
struct initialization
M2-Planet doesn't support static initialization for structs yet.
Simply because time hasn't been made available for the effort.
Patches for adding support are welcome.
AMD64 & AArch64 int initialization wrong
right now the code in cc_core.c in the function void program() simply doesn't output the correct output for AArch64 or AMD64. As the function should numerate the string global_token to determine if the leading 32bits should be 0 or 0xFFFFFFFF and output %0 or %0xFFFFFFFF accordingly.
example of failing code
#include<stdlib.h> #include<stdio.h> #include<string.h>
void write_string(char* s, FILE* f) { while(0 != s[0]) { fputc(s[0], f); s = s + 1; } }
void* empty = 0;
int main() { if (0 == empty) { write_string("Yes, is empty\n", stdout); } else { write_string("Oops, why not?\n", stdout); } return 0; }
Arrays
multidimensional arrays return wrong results
example of failing code
#include <stdio.h>
char** env_argv;
char getargchar(int n, int k) { return env_argv[n][k]; }
int main(int argc, char** argv) { env_argv = argv; fputc(getargchar(2, 4), stdout); return 0; }
run with: ./example 12345 abcdef ABCDEF
work around code
char getargchar(int n, int k) { char *tmp = env_argv[n]; return tmp[k]; }
typedef doesn't work
M2-Planet doesn't support this function yet as the time for its development has not been allocated yet.
Patches are welcome
C style function pointers
M2-Planet supports universal function pointers FUNCTION Simply delete the typedef and the code works fine in M2-Planet
example of failing code
#include <stdio.h> typedef int (*FUNCTION) ();
struct function { FUNCTION function; int arity; char* name; };
struct function fun_make_cell_;
int make_cell_ () { char* i = fun_make_cell_.name; while(0 != i[0]) { fputc(i[0], stdout); i = i + 1; } return fun_make_cell_.arity; }
int main () { fun_make_cell_.function = make_cell_; fun_make_cell_.arity = 2; fun_make_cell_.name = "bar\n"; fun_make_cell_.function(); }