diff options
Diffstat (limited to 'runtime/vmop.h')
| -rw-r--r-- | runtime/vmop.h | 40 |
1 files changed, 37 insertions, 3 deletions
diff --git a/runtime/vmop.h b/runtime/vmop.h index c3d5d5f4..67048c26 100644 --- a/runtime/vmop.h +++ b/runtime/vmop.h @@ -26,6 +26,7 @@ #define INCLUDED_VMOP_H #include "ctok_token.h" +#include "vmstk.h" #include "stringbuf.h" /* machine instructions types */ @@ -59,17 +60,45 @@ typedef enum { /* do NOT start at 0 to detect uninitialized types after calloc( opcode_PUSHMSGVAR = 1002, /* requires var operand */ opcode_PUSHCONSTANT = 1003, /* requires var operand */ opcode_UNARY_MINUS = 1010, - opcode_END_PROG = 1011 + opcode_FUNC_CALL = 1012, + opcode_END_PROG = 2000 } opcode_t; +/* Additional doc, operation specific + + FUNC_CALL + All parameter passing is via the stack. Parameters are placed onto the stack in reverse order, + that means the last parameter is on top of the stack, the first at the bottom location. + At the actual top of the stack is the number of parameters. This permits functions to be + called with variable number of arguments. The function itself is responsible for poping + the right number of parameters of the stack and complaining if the number is incorrect. + On exit, a single return value must be pushed onto the stack. The FUNC_CALL operation + is generic. Its pVar argument contains the function name string (TODO: very slow, make + faster in later releases). + + Sample Function call: sampleFunc(p1, p2, p3) ; returns number 4711 (sample) + Stacklayout on entry (order is top to bottom): + 3 + p3 + p2 + p1 + ... other vars ... + + Stack on exit + 4711 + ... other vars ... + + */ + + /* the vmop object */ typedef struct vmop_s { BEGINobjInstance; /* Data to implement generic object - MUST be the first data element! */ opcode_t opcode; union { var_t *pVar; - /* TODO: add function pointer */ + prsf_t rsf; /* pointer to function for "call" instruction */ } operand; struct vmop_s *pNext; /* next operation or NULL, if end of program (logically this belongs to vmprg) */ } vmop_t; @@ -85,8 +114,13 @@ BEGINinterface(vmop) /* name must also be changed in ENDinterface macro! */ rsRetVal (*SetVar)(vmop_t *pThis, var_t *pVar); rsRetVal (*Opcode2Str)(vmop_t *pThis, uchar **ppName); rsRetVal (*Obj2Str)(vmop_t *pThis, cstr_t *pstr); + /* v2 */ + rsRetVal (*SetFunc)(vmop_t *pThis, cstr_t *pcsFuncName); ENDinterface(vmop) -#define vmopCURR_IF_VERSION 1 /* increment whenever you change the interface structure! */ +#define vmopCURR_IF_VERSION 2 /* increment whenever you change the interface structure! */ +/* interface changes, v1 -> v2 + * added SetFuct after existing function pointers -- rgerhards, 2009-04-06 + */ /* the remaining prototypes */ PROTOTYPEObj(vmop); |