renumbered byte codes and removed fragile code handling tail-call optimization

This commit is contained in:
hyunghwan.chung
2015-06-29 13:52:40 +00:00
parent c233bb95a7
commit 51d7db9b96
6 changed files with 988 additions and 701 deletions

View File

@ -30,7 +30,7 @@
#include "stix.h"
/* you can define this to either 1 or 2 */
#define STIX_CODE_EXTEND_SIZE 2
#define STIX_BCODE_LONG_PARAM_SIZE 2
/* this is useful for debugging. stix_gc() can be called
* while stix has not been fully initialized when this is defined*/
@ -460,195 +460,301 @@ struct stix_compiler_t
#endif
#if defined(STIX_CODE_EXTEND_SIZE) && (STIX_CODE_EXTEND_SIZE == 1)
#if defined(STIX_BCODE_LONG_PARAM_SIZE) && (STIX_BCODE_LONG_PARAM_SIZE == 1)
# define MAX_CODE_INDEX (0xFFu)
# define MAX_CODE_NTMPRS (0xFFu)
# define MAX_CODE_NARGS (0xFFu)
# define MAX_CODE_NBLKARGS (0xFFu)
# define MAX_CODE_NBLKTMPRS (0xFFu)
# define MAX_CODE_PRIMNO (0xFFFFu)
# define MIN_CODE_JUMP (-0x80)
# define MAX_CODE_JUMP (0x7F)
#elif defined(STIX_CODE_EXTEND_SIZE) && (STIX_CODE_EXTEND_SIZE == 2)
# define MAX_CODE_JUMP (0xFF)
#elif defined(STIX_BCODE_LONG_PARAM_SIZE) && (STIX_BCODE_LONG_PARAM_SIZE == 2)
# define MAX_CODE_INDEX (0xFFFFu)
# define MAX_CODE_NTMPRS (0xFFFFu)
# define MAX_CODE_NARGS (0xFFFFu)
# define MAX_CODE_NBLKARGS (0xFFFFu)
# define MAX_CODE_NBLKTMPRS (0xFFFFu)
# define MAX_CODE_PRIMNO (0xFFFFu)
# define MIN_CODE_JUMP (-0x8000)
# define MAX_CODE_JUMP (0x7FFF)
# define MAX_CODE_JUMP (0xFFFF)
#else
# error Unsupported STIX_CODE_EXTEND_SIZE
# error Unsupported STIX_BCODE_LONG_PARAM_SIZE
#endif
#define MAX_CODE_BLKCODE MAX_CODE_JUMP
#define MAKE_CODE(x,y) (((x) << 4) | y)
/*
--------------------------------------
----------------------------------------------------------------------------------------------------------------
SHORT INSTRUCTION CODE LONG INSTRUCTION CODE
----------------------------------------------------------------------------------------------------------------
v v
0-3 0000 00XX STORE_INTO_INSTVAR 128 1000 0000 XXXXXXXX STORE_INTO_INSTVAR_X (bit 4 off, bit 3 off)
4-7 0000 01XX STORE_INTO_INSTVAR
8-11 0000 10XX POP_INTO_INSTVAR 136 1000 1000 XXXXXXXX POP_INTO_INSTVAR_X (bit 4 off, bit 3 on)
12-15 0000 11XX POP_INTO_INSTVAR
16-19 0001 00XX PUSH_INSTVAR 144 1001 0000 XXXXXXXX PUSH_INSTVAR_X (bit 4 on)
20-23 0001 01XX PUSH_INSTVAR
0 000000XX PUSH_INSTVAR
1 000001XX PUSH_TEMPVAR
2 000010XX PUSH_LITERAL
3 000011XX STORE_INTO_INSTVAR
4 000100XX STORE_INTO_TEMPVAR
5 000101XX POP_INTO_INSTVAR
6 000110XX POP_INTO_TEMPVAR
v v
24-27 0001 10XX PUSH_TEMPVAR 152 1001 1000 XXXXXXXX PUSH_TEMPVAR_X (bit 4 on)
28-31 0001 11XX PUSH_TEMPVAR
32-35 0010 00XX STORE_INTO_TEMPVAR 160 1010 0000 XXXXXXXX STORE_INTO_TEMPVAR_X (bit 4 off, bit 3 off)
36-39 0010 01XX STORE_INTO_TEMPVAR
40-43 0010 10XX POP_INTO_TEMPVAR 168 1010 1000 XXXXXXXX POP_INTO_TEMPVAR_X (bit 4 off, bit 3 on)
44-47 0010 11XX POP_INTO_TEMPVAR
7 000111XX JUMP_FORWARD
8 001000XX JUMP_BACKWARD
9 001001XX JUMP_IF_TRUE
10 001010XX JUMP_IF_FALSE
48-51 0011 00XX PUSH_LITERAL 176 1011 0000 XXXXXXXX PUSH_LITERAL_X
52-55 0011 01XX PUSH_LITERAL
11 001011XX
12 001100XX
13 001101XX
14 001110XX
15 001111XX
---------------------------------------
16 010000XX YYYYYYYY PUSH_XTEMPVAR XXXth outer-frame, YYYYYYYY local variable
17 010001XX YYYYYYYY STORE_INTO_XTEMPVAR
18 010010XX YYYYYYYY POP_INTO_XTEMPVAR
19 010011XX YYYYYYYY PUSH_OBJVAR
20 010100XX YYYYYYYY STORE_INTO_OBJVAR
21 010101XX YYYYYYYY POP_INTO_OBJVAR XXXth instance variable of YYYYYYYY object
22 010110XX YYYYYYYY SEND_MESSAGE
23 010111XX YYYYYYYY SEND_MESSAGE_TO_SUPER XXX args, YYYYYYYY message
24 011000XX
25 011001XX
26 011010XX
27 011011XX
28 011100XX
29 011101XX
30 011110XX
31 011111XX
-------------------------------------
vv
56-59 0011 10XX STORE_INTO_OBJECT 184 1011 1000 XXXXXXXX STORE_INTO_OBJECT (bit 3 on, bit 2 off)
60-63 0011 11XX POP_INTO_OBJECT 188 1011 1100 XXXXXXXX POP_INTO_OBJECT (bit 3 on, bit 2 on)
64-67 0100 00XX PUSH_OBJECT 192 1100 0000 XXXXXXXX PUSH_OBJECT (bit 3 off)
68-71 0100 01XX JUMP_FORWARD 196 1100 0100 XXXXXXXX JUMP_FORWARD_X
72-75 0100 10XX JUMP_BACKWARD 200 1100 1000 XXXXXXXX JUMP_BACKWARD_X
76-79 0100 11XX JUMP_IF_TRUE 204 1100 1100 XXXXXXXX JUMP_IF_TRUE_X
80-83 0101 00XX JUMP_IF_FALSE 208 1101 0000 XXXXXXXX JUMP_IF_FALSE_X
84-87 0101 01XX JUMP_BY_OFFSET 212 1101 0100 XXXXXXXX JUMP_BY_OFFSET_X
# for JUMP_BY_OFFSET, XX is an index to literal frame pointing to a small integer.
switch (binst)
{
case XXX:
case YYY:
vv
88-91 0101 10XX YYYYYYYY STORE_INTO_CTXTEMPVAR 216 1101 1000 XXXXXXXX YYYYYYYY STORE_INTO_CTXTEMPVAR_X (bit 3 on, bit 2 off)
92-95 0101 11XX YYYYYYYY POP_INTO_CTXTEMPVAR 220 1101 1100 XXXXXXXX YYYYYYYY POP_INTO_CTXTEMPVAR_X (bit 3 on, bit 2 on)
96-99 0110 00XX YYYYYYYY PUSH_CTXTEMPVAR 224 1110 0000 XXXXXXXX YYYYYYYY PUSH_CTXTEMPVAR_X (bit 3 off)
# XXXth outer-frame, YYYYYYYY local variable
100-103 0110 01XX YYYYYYYY PUSH_OBJVAR 228 1110 0100 XXXXXXXX YYYYYYYY PUSH_OBJVAR_X (bit 3 off)
104-107 0110 10XX YYYYYYYY STORE_INTO_OBJVAR 232 1110 1000 XXXXXXXX YYYYYYYY STORE_INTO_OBJVAR_X (bit 3 on, bit 2 off)
108-111 0110 11XX YYYYYYYY POP_INTO_OBJVAR 236 1110 1100 XXXXXXXX YYYYYYYY POP_INTO_OBJVAR_X (bit 3 on, bit 2 on)
# XXXth instance variable of YYYYYYYY object
default:
{
cmd = binst >> 2;
v
112-115 0111 00XX YYYYYYYY SEND_MESSAGE 240 1111 0000 XXXXXXXX YYYYYYYY SEND_MESSAGE_X (bit 2 off)
116-119 0111 01XX YYYYYYYY SEND_MESSAGE_TO_SUPER 244 1111 0100 XXXXXXXX YYYYYYYY SEND_MESSAGE_TO_SUPER_X (bit 2 on)
# XXX args, YYYYYYYY message
switch (cmd)
{
case PUSH_INSTVAR:
case PUSHX_INSTVAR:
default:
treated as no op???
}
}
}
120-123 0111 10XX UNUSED
124-127 0111 11XX UNUSED
##
## "SHORT_CODE_0 | 0x80" becomes "LONG_CODE_X".
## A special single byte instruction is assigned an unused number greater than 128.
##
*/
enum stix_cmdcode_t
enum stix_bcode_t
{
CMD_EXTEND = 0x0,
BCODE_STORE_INTO_INSTVAR_0 = 0x00,
BCODE_STORE_INTO_INSTVAR_1 = 0x01,
BCODE_STORE_INTO_INSTVAR_2 = 0x02,
BCODE_STORE_INTO_INSTVAR_3 = 0x03,
/* Single positional instructions
*
* XXXXJJJJ
* 0000XXXX JJJJJJJJ
* 0000XXXX JJJJJJJJ JJJJJJJJ
*
* XXXX is one of the following positional instructions.
* JJJJ or JJJJJJJJ is the position.
*/
CMD_PUSH_INSTVAR = 0x1,
CMD_PUSH_TEMPVAR = 0x2,
CMD_PUSH_LITERAL = 0x3,
CMD_STORE_INTO_INSTVAR = 0x4,
CMD_STORE_INTO_TEMPVAR = 0x5,
BCODE_STORE_INTO_INSTVAR_4 = 0x04,
BCODE_STORE_INTO_INSTVAR_5 = 0x05,
BCODE_STORE_INTO_INSTVAR_6 = 0x06,
BCODE_STORE_INTO_INSTVAR_7 = 0x07,
/*
CMD_POP_INTO_INSTVAR = 0x6,
CMD_POP_INTO_TEMPVAR = 0x7,
CMD_POP_INTO_OBJVAR = 0xXXX,
*/
/* Jump is a single positional instructions.
* JJJJJJJJ in the extended format is encoded as a signed offset
* while JJJJ in the compact format is an unsigned offset. */
CMD_JUMP = 0x8,
CMD_JUMP_IF_FALSE = 0x9,
BCODE_POP_INTO_INSTVAR_0 = 0x08,
BCODE_POP_INTO_INSTVAR_1 = 0x09,
BCODE_POP_INTO_INSTVAR_2 = 0x0A,
BCODE_POP_INTO_INSTVAR_3 = 0x0B,
/*
* Double positional instructions
*
* XXXXJJJJ KKKKKKKK
* 0000XXXX JJJJJJJJ KKKKKKKK
* 0000XXXX JJJJJJJJ JJJJJJJJ KKKKKKKK KKKKKKKK
*
* Access instance variable #JJJJ of an object at literal frame #KKKKKKKK
* Send message at literal frame #KKKKKKKK with #JJJJ arguments.
*/
CMD_PUSH_OBJVAR = 0xA,
CMD_STORE_INTO_OBJVAR = 0xB,
CMD_SEND_MESSAGE = 0xC,
CMD_SEND_MESSAGE_TO_SUPER = 0xD,
BCODE_POP_INTO_INSTVAR_4 = 0x0C,
BCODE_POP_INTO_INSTVAR_5 = 0x0D,
BCODE_POP_INTO_INSTVAR_6 = 0x0E,
BCODE_POP_INTO_INSTVAR_7 = 0x0F,
/*
* Single byte instructions
*/
CMD_PUSH_SPECIAL = 0xE,
CMD_DO_SPECIAL = 0xF,
BCODE_PUSH_INSTVAR_0 = 0x10,
BCODE_PUSH_INSTVAR_1 = 0x11,
BCODE_PUSH_INSTVAR_2 = 0x12,
BCODE_PUSH_INSTVAR_3 = 0x13,
/* sub-commands for CMD_PUSH_SPECIAL */
SUBCMD_PUSH_RECEIVER = 0x0,
SUBCMD_PUSH_NIL = 0x1,
SUBCMD_PUSH_TRUE = 0x2,
SUBCMD_PUSH_FALSE = 0x3,
SUBCMD_PUSH_CONTEXT = 0x4,
SUBCMD_PUSH_NEGONE = 0x5,
SUBCMD_PUSH_ZERO = 0x6,
SUBCMD_PUSH_ONE = 0x7,
BCODE_PUSH_INSTVAR_4 = 0x14,
BCODE_PUSH_INSTVAR_5 = 0x15,
BCODE_PUSH_INSTVAR_6 = 0x16,
BCODE_PUSH_INSTVAR_7 = 0x17,
/* sub-commands for CMD_DO_SPECIAL */
SUBCMD_DUP_STACKTOP = 0x0,
SUBCMD_POP_STACKTOP = 0x1,
SUBCMD_RETURN_STACKTOP = 0x2, /* ^something */
SUBCMD_RETURN_RECEIVER = 0x3, /* ^self */
SUBCMD_RETURN_FROM_BLOCK = 0x4, /* return the stack top from a block */
SUBCMD_SEND_BLOCK_COPY = 0xE,
SUBCMD_NOOP = 0xF
BCODE_PUSH_TEMPVAR_0 = 0x18,
BCODE_PUSH_TEMPVAR_1 = 0x19,
BCODE_PUSH_TEMPVAR_2 = 0x1A,
BCODE_PUSH_TEMPVAR_3 = 0x1B,
BCODE_PUSH_TEMPVAR_4 = 0x1C,
BCODE_PUSH_TEMPVAR_5 = 0x1D,
BCODE_PUSH_TEMPVAR_6 = 0x1E,
BCODE_PUSH_TEMPVAR_7 = 0x1F,
BCODE_STORE_INTO_TEMPVAR_0 = 0x20,
BCODE_STORE_INTO_TEMPVAR_1 = 0x21,
BCODE_STORE_INTO_TEMPVAR_2 = 0x22,
BCODE_STORE_INTO_TEMPVAR_3 = 0x23,
BCODE_STORE_INTO_TEMPVAR_4 = 0x24,
BCODE_STORE_INTO_TEMPVAR_5 = 0x25,
BCODE_STORE_INTO_TEMPVAR_6 = 0x26,
BCODE_STORE_INTO_TEMPVAR_7 = 0x27,
BCODE_POP_INTO_TEMPVAR_0 = 0x28,
BCODE_POP_INTO_TEMPVAR_1 = 0x29,
BCODE_POP_INTO_TEMPVAR_2 = 0x2A,
BCODE_POP_INTO_TEMPVAR_3 = 0x2B,
BCODE_POP_INTO_TEMPVAR_4 = 0x2C,
BCODE_POP_INTO_TEMPVAR_5 = 0x2D,
BCODE_POP_INTO_TEMPVAR_6 = 0x2E,
BCODE_POP_INTO_TEMPVAR_7 = 0x2F,
BCODE_PUSH_LITERAL_0 = 0x30,
BCODE_PUSH_LITERAL_1 = 0x31,
BCODE_PUSH_LITERAL_2 = 0x32,
BCODE_PUSH_LITERAL_3 = 0x33,
BCODE_PUSH_LITERAL_4 = 0x34,
BCODE_PUSH_LITERAL_5 = 0x35,
BCODE_PUSH_LITERAL_6 = 0x36,
BCODE_PUSH_LITERAL_7 = 0x37,
/* -------------------------------------- */
BCODE_STORE_INTO_OBJECT_0 = 0x38,
BCODE_STORE_INTO_OBJECT_1 = 0x39,
BCODE_STORE_INTO_OBJECT_2 = 0x3A,
BCODE_STORE_INTO_OBJECT_3 = 0x3B,
BCODE_POP_INTO_OBJECT_0 = 0x3C,
BCODE_POP_INTO_OBJECT_1 = 0x3D,
BCODE_POP_INTO_OBJECT_2 = 0x3E,
BCODE_POP_INTO_OBJECT_3 = 0x3F,
BCODE_PUSH_OBJECT_0 = 0x40,
BCODE_PUSH_OBJECT_1 = 0x41,
BCODE_PUSH_OBJECT_2 = 0x42,
BCODE_PUSH_OBJECT_3 = 0x43,
BCODE_JUMP_FORWARD_0 = 0x44, /* 68 */
BCODE_JUMP_FORWARD_1 = 0x45, /* 69 */
BCODE_JUMP_FORWARD_2 = 0x46, /* 70 */
BCODE_JUMP_FORWARD_3 = 0x47, /* 71 */
BCODE_JUMP_BACKWARD_0 = 0x48,
BCODE_JUMP_BACKWARD_1 = 0x49,
BCODE_JUMP_BACKWARD_2 = 0x4A,
BCODE_JUMP_BACKWARD_3 = 0x4B,
BCODE_JUMP_IF_TRUE_0 = 0x4C,
BCODE_JUMP_IF_TRUE_1 = 0x4D,
BCODE_JUMP_IF_TRUE_2 = 0x4E,
BCODE_JUMP_IF_TRUE_3 = 0x4F,
BCODE_JUMP_IF_FALSE_0 = 0x50,
BCODE_JUMP_IF_FALSE_1 = 0x51,
BCODE_JUMP_IF_FALSE_2 = 0x52,
BCODE_JUMP_IF_FALSE_3 = 0x53,
BCODE_JUMP_BY_OFFSET_0 = 0x54,
BCODE_JUMP_BY_OFFSET_1 = 0x55,
BCODE_JUMP_BY_OFFSET_2 = 0x56,
BCODE_JUMP_BY_OFFSET_3 = 0x57,
BCODE_PUSH_CTXTEMPVAR_0 = 0x58,
BCODE_PUSH_CTXTEMPVAR_1 = 0x59,
BCODE_PUSH_CTXTEMPVAR_2 = 0x5A,
BCODE_PUSH_CTXTEMPVAR_3 = 0x5B,
BCODE_STORE_INTO_CTXTEMPVAR_0 = 0x5C,
BCODE_STORE_INTO_CTXTEMPVAR_1 = 0x5D,
BCODE_STORE_INTO_CTXTEMPVAR_2 = 0x5E,
BCODE_STORE_INTO_CTXTEMPVAR_3 = 0x5F,
BCODE_POP_INTO_CTXTEMPVAR_0 = 0x60,
BCODE_POP_INTO_CTXTEMPVAR_1 = 0x61,
BCODE_POP_INTO_CTXTEMPVAR_2 = 0x62,
BCODE_POP_INTO_CTXTEMPVAR_3 = 0x63,
BCODE_PUSH_OBJVAR_0 = 0x64,
BCODE_PUSH_OBJVAR_1 = 0x65,
BCODE_PUSH_OBJVAR_2 = 0x66,
BCODE_PUSH_OBJVAR_3 = 0x67,
BCODE_STORE_INTO_OBJVAR_0 = 0x68,
BCODE_STORE_INTO_OBJVAR_1 = 0x69,
BCODE_STORE_INTO_OBJVAR_2 = 0x6A,
BCODE_STORE_INTO_OBJVAR_3 = 0x6B,
BCODE_POP_INTO_OBJVAR_0 = 0x6C,
BCODE_POP_INTO_OBJVAR_1 = 0x6D,
BCODE_POP_INTO_OBJVAR_2 = 0x6E,
BCODE_POP_INTO_OBJVAR_3 = 0x6F,
BCODE_SEND_MESSAGE_0 = 0x70,
BCODE_SEND_MESSAGE_1 = 0x71,
BCODE_SEND_MESSAGE_2 = 0x72,
BCODE_SEND_MESSAGE_3 = 0x73,
BCODE_SEND_MESSAGE_TO_SUPER_0 = 0x74,
BCODE_SEND_MESSAGE_TO_SUPER_1 = 0x75,
BCODE_SEND_MESSAGE_TO_SUPER_2 = 0x76,
BCODE_SEND_MESSAGE_TO_SUPER_3 = 0x77,
/* UNUSED 0x78 - 0x7F */
BCODE_STORE_INTO_INSTVAR_X = 0x80, /* 128 */
BCODE_POP_INTO_INSTVAR_X = 0x88, /* 136 */
BCODE_PUSH_INSTVAR_X = 0x90, /* 144 */
BCODE_PUSH_TEMPVAR_X = 0x98, /* 152 */
BCODE_STORE_INTO_TEMPVAR_X = 0xA0, /* 160 */
BCODE_POP_INTO_TEMPVAR_X = 0xA8, /* 168 */
BCODE_PUSH_LITERAL_X = 0xB0, /* 176 */
BCODE_STORE_INTO_OBJECT_X = 0xB8, /* 184 */
BCODE_POP_INTO_OBJECT_X = 0xBC, /* 188 */
BCODE_PUSH_OBJECT_X = 0xC0, /* 192 */
BCODE_JUMP_FORWARD_X = 0xC4, /* 196 */
BCODE_JUMP_BACKWARD_X = 0xC8, /* 200 */
BCODE_JUMP_IF_TRUE_X = 0xCC, /* 204 */
BCODE_JUMP_IF_FALSE_X = 0xD0, /* 208 */
BCODE_JUMP_BY_OFFSET_X = 0xD4, /* 212 */
BCODE_STORE_INTO_CTXTEMPVAR_X = 0xD8, /* 216 */
BCODE_POP_INTO_CTXTEMPVAR_X = 0xDC, /* 220 */
BCODE_PUSH_CTXTEMPVAR_X = 0xE0, /* 224 */
BCODE_PUSH_OBJVAR_X = 0xE4, /* 228 */
BCODE_STORE_INTO_OBJVAR_X = 0xE8, /* 232 */
BCODE_POP_INTO_OBJVAR_X = 0xEC, /* 236 */
BCODE_SEND_MESSAGE_X = 0xF0, /* 240 */
BCODE_SEND_MESSAGE_TO_SUPER_X = 0xF4, /* 244 */
BCODE_PUSH_RECEIVER = 0x81,
BCODE_PUSH_NIL = 0x82,
BCODE_PUSH_TRUE = 0x83,
BCODE_PUSH_FALSE = 0x84,
BCODE_PUSH_CONTEXT = 0x85,
BCODE_PUSH_NEGONE = 0x86,
BCODE_PUSH_ZERO = 0x87,
BCODE_PUSH_ONE = 0x89,
BCODE_PUSH_TWO = 0x91,
/* UNUSED 0xE8 - 0xF8 */
BCODE_DUP_STACKTOP = 0xF9,
BCODE_POP_STACKTOP = 0xFA,
BCODE_RETURN_STACKTOP = 0xFB, /* ^something */
BCODE_RETURN_RECEIVER = 0xFC, /* ^self */
BCODE_RETURN_FROM_BLOCK = 0xFD, /* return the stack top from a block */
BCODE_SEND_BLOCK_COPY = 0xFE,
BCODE_NOOP = 0xFF
};
/* ---------------------------------- */
#define CODE_PUSH_RECEIVER MAKE_CODE(CMD_PUSH_SPECIAL, SUBCMD_PUSH_RECEIVER)
#define CODE_PUSH_NIL MAKE_CODE(CMD_PUSH_SPECIAL, SUBCMD_PUSH_NIL)
#define CODE_PUSH_TRUE MAKE_CODE(CMD_PUSH_SPECIAL, SUBCMD_PUSH_TRUE)
#define CODE_PUSH_FALSE MAKE_CODE(CMD_PUSH_SPECIAL, SUBCMD_PUSH_FALSE)
#define CODE_PUSH_CONTEXT MAKE_CODE(CMD_PUSH_SPECIAL, SUBCMD_PUSH_CONTEXT)
#define CODE_PUSH_NEGONE MAKE_CODE(CMD_PUSH_SPECIAL, SUBCMD_PUSH_NEGONE)
#define CODE_PUSH_ZERO MAKE_CODE(CMD_PUSH_SPECIAL, SUBCMD_PUSH_ZERO)
#define CODE_PUSH_ONE MAKE_CODE(CMD_PUSH_SPECIAL, SUBCMD_PUSH_ONE)
/* special code */
#define CODE_DUP_STACKTOP MAKE_CODE(CMD_DO_SPECIAL, SUBCMD_DUP_STACKTOP)
#define CODE_POP_STACKTOP MAKE_CODE(CMD_DO_SPECIAL, SUBCMD_POP_STACKTOP)
#define CODE_RETURN_STACKTOP MAKE_CODE(CMD_DO_SPECIAL, SUBCMD_RETURN_STACKTOP)
#define CODE_RETURN_RECEIVER MAKE_CODE(CMD_DO_SPECIAL, SUBCMD_RETURN_RECEIVER)
#define CODE_RETURN_FROM_BLOCK MAKE_CODE(CMD_DO_SPECIAL, SUBCMD_RETURN_FROM_BLOCK)
#define CODE_SEND_BLOCK_COPY MAKE_CODE(CMD_DO_SPECIAL, SUBCMD_SEND_BLOCK_COPY)
#define CODE_NOOP MAKE_CODE(CMD_DO_SPECIAL, SUBCMD_NOOP)
#if defined(__cplusplus)
extern "C" {
#endif