3 ms·

> Reserved words are initialized from an imaginary source code. What does it mean? Could you point to a place in the source?

• lifthrasiir 7y ago
  I mean this part: p = "char else enum if int return sizeof while " "open read close printf malloc free memset memcmp exit void main"; i = Char; while (i <= While) { next(); id[Tk] = i++; } // add keywords to symbol table i = OPEN; while (i <= EXIT) { next(); id[Class] = Sys; id[Type] = INT; id[Val] = i++; } // add library to symbol table next(); id[Tk] = Char; // handle void type next(); idmain = id; // keep track of main Throughout the entire source code p is a source code pointer, but at the very beginning of the program it is a string containing all reserved words and library functions, and they are read with the same lexing function `next` to the symbol table before the memory for the actual source code is allocated.