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a c4-like compiler & vm to run a subset of C
c-minus-minus's Introduction
- source code -> |Lexer| -> token stream -> |Parser| -> VM code
- program: {global_decl}
- global_decl: var_decl | enum_decl | func_decl
- var_decl: type [
*] Id [, [*] Id] ;
- enum_decl:
enum [Id] { Id [= num] [, Id [= num]] } ;
- func_decl: type [
*] Id ( param_decl ) { {var_decl}, {stmt} }
- param_decl: type [
*] Id [, type [*] Id]
- stmt:
{ stmt } | if_stmt | while_stmt | return_stmt | empty_stmt | normal_stmt
- normal_stmt: expression
;
- type:
char | int
Minimalist Virtual Machine
- Register
- Memory
- Instruction Set
- Save & Load:
IMM | LEA | LC | SC | LI | SI | PUSH
- Arithmetic & Logical Operations:
ADD | SUB | MUL | DIV | MOD | OR | XOR | AND | SHL | SHR | EQ | NE | LT | LE | GT | GE
- Control:
JMP | JZ | JNZ | CALL | NVAR | DARG | RET
- Native-Call:
OPEN | CLOS | READ | PRTF | MALC | FREE | MSET | MCMP | EXIT
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