diff options
Diffstat (limited to 'src/sys/include/np')
| -rw-r--r-- | src/sys/include/np/piir.h | 39 |
1 files changed, 36 insertions, 3 deletions
diff --git a/src/sys/include/np/piir.h b/src/sys/include/np/piir.h index 9c4b322..8277c1f 100644 --- a/src/sys/include/np/piir.h +++ b/src/sys/include/np/piir.h @@ -35,7 +35,13 @@ #include <os/spinlock.h> #include <os/np.h> -typedef uint8_t ir_byte_t; +/* + * Represents two different kinds of bytes, MI IR + * bytes and MD opcode / instruction bytes, less than + * zero values are reserved for error indication. + */ +typedef int8_t ir_byte_t; +typedef int8_t md_byte_t; /* * The maxiumum size of the bytecode stack per @@ -49,16 +55,33 @@ typedef uint8_t ir_byte_t; #define PIIR_LOAD_R16 0x02 #define PIIR_LOAD_R32 0x03 #define PIIR_LOAD_R64 0x04 +#define PIIR_RET_NIL 0x05 /* Return nothing */ + +/* + * Represents the PIIR virtual machine for storing + * state while converting IR to instruction bytes + * + * @code: Generated machine code + * @last_ir: Last IR byte used + * @code_i: Current index into code buffer + */ +struct piir_vm { + md_byte_t code[4096]; + ir_byte_t last_ir; + uint32_t code_i; +}; /* * Represents the Pi-IR (PIIR) bytecode stack * * @opstore: The actual stack - * @op_i: Index into the stack + * @op_head: Where new ops are written + * @op_tail: Where new ops are read */ struct piir_stack { ir_byte_t opstore[PIIR_STACK_SIZE]; - uint16_t op_i; + uint16_t op_head; + uint16_t op_tail; struct spinlock lock; }; @@ -94,4 +117,14 @@ int piir_push(struct piir_stack *stack, ir_byte_t byte); */ int piir_pop(struct piir_stack *stack); +/* + * Inject control flow via stack machine + * + * @work: Current work + * + * Returns zero on success, otherwise a less than + * zero value on failure. + */ +int piir_inject(struct np_work *work); + #endif /* !_NP_PIIR_H_ */ |