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/* Abstract Machine for the Small compiler
*
* Copyright (c) ITB CompuPhase, 1997-2003
*
* This software is provided "as-is", without any express or implied warranty.
* In no event will the authors be held liable for any damages arising from
* the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software in
* a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*
* Version: $Id$
*/
#ifndef EMBRYO_CC_AMX_H
#define EMBRYO_CC_AMX_H
#include <sys/types.h>
/* calling convention for all interface functions and callback functions */
/* File format version Required AMX version
* 0 (original version) 0
* 1 (opcodes JUMP.pri, SWITCH and CASETBL) 1
* 2 (compressed files) 2
* 3 (public variables) 2
* 4 (opcodes SWAP.pri/alt and PUSHADDR) 4
* 5 (tagnames table) 4
* 6 (reformatted header) 6
* 7 (name table, opcodes SYMTAG & SYSREQ.D) 7
*/
#define CUR_FILE_VERSION 7 /* current file version; also the current AMX version */
#define MIN_FILE_VERSION 6 /* lowest supported file format version for the current AMX version */
#define MIN_AMX_VERSION 7 /* minimum AMX version needed to support the current file format */
#if !defined CELL_TYPE
#define CELL_TYPE
typedef unsigned int ucell;
typedef int cell;
#endif
struct tagAMX;
typedef cell(*AMX_NATIVE) (struct tagAMX * amx,
cell * params);
typedef int (* AMX_CALLBACK) (struct tagAMX * amx, cell index,
cell * result, cell * params);
typedef int (* AMX_DEBUG) (struct tagAMX * amx);
typedef struct
{
char *name;
AMX_NATIVE func ;
} AMX_NATIVE_INFO ;
#define AMX_USERNUM 4
#define sEXPMAX 19 /* maximum name length for file version <= 6 */
#define sNAMEMAX 31 /* maximum name length of symbol name */
#if defined (_MSC_VER) || (defined (__SUNPRO_C) && __SUNPRO_C < 0x5100)
# pragma pack(1)
# define EMBRYO_STRUCT_PACKED
#elif defined (__GNUC__) || (defined (__SUNPRO_C) && __SUNPRO_C >= 0x5100)
# define EMBRYO_STRUCT_PACKED __attribute__((packed))
#else
# define EMBRYO_STRUCT_PACKED
#endif
typedef struct tagAMX_FUNCSTUB
{
unsigned int address;
char name[sEXPMAX + 1];
} EMBRYO_STRUCT_PACKED AMX_FUNCSTUB;
/* The AMX structure is the internal structure for many functions. Not all
* fields are valid at all times; many fields are cached in local variables.
*/
typedef struct tagAMX
{
unsigned char *base; /* points to the AMX header ("amxhdr") plus the code, optionally also the data */
unsigned char *data; /* points to separate data+stack+heap, may be NULL */
AMX_CALLBACK callback;
AMX_DEBUG debug ; /* debug callback */
/* for external functions a few registers must be accessible from the outside */
cell cip ; /* instruction pointer: relative to base + amxhdr->cod */
cell frm ; /* stack frame base: relative to base + amxhdr->dat */
cell hea ; /* top of the heap: relative to base + amxhdr->dat */
cell hlw ; /* bottom of the heap: relative to base + amxhdr->dat */
cell stk ; /* stack pointer: relative to base + amxhdr->dat */
cell stp ; /* top of the stack: relative to base + amxhdr->dat */
int flags ; /* current status, see amx_Flags() */
/* for assertions and debug hook */
cell curline ;
cell curfile ;
int dbgcode ;
cell dbgaddr ;
cell dbgparam ;
char *dbgname;
/* user data */
long usertags[AMX_USERNUM];
void *userdata[AMX_USERNUM];
/* native functions can raise an error */
int error ;
/* the sleep opcode needs to store the full AMX status */
cell pri ;
cell alt ;
cell reset_stk ;
cell reset_hea ;
cell *syscall_d; /* relocated value/address for the SYSCALL.D opcode */
} EMBRYO_STRUCT_PACKED AMX;
/* The AMX_HEADER structure is both the memory format as the file format. The
* structure is used internaly.
*/
typedef struct tagAMX_HEADER
{
int size ; /* size of the "file" */
unsigned short magic ; /* signature */
char file_version ; /* file format version */
char amx_version ; /* required version of the AMX */
unsigned short flags ;
unsigned short defsize ; /* size of a definition record */
int cod ; /* initial value of COD - code block */
int dat ; /* initial value of DAT - data block */
int hea ; /* initial value of HEA - start of the heap */
int stp ; /* initial value of STP - stack top */
int cip ; /* initial value of CIP - the instruction pointer */
int publics ; /* offset to the "public functions" table */
int natives ; /* offset to the "native functions" table */
int libraries ; /* offset to the table of libraries */
int pubvars ; /* the "public variables" table */
int tags ; /* the "public tagnames" table */
int nametable ; /* name table, file version 7 only */
} EMBRYO_STRUCT_PACKED AMX_HEADER;
#if defined _MSC_VER || (defined (__SUNPRO_C) && __SUNPRO_C < 0x5100)
# pragma pack()
#endif
#define AMX_MAGIC 0xf1e0
enum
{
AMX_ERR_NONE,
/* reserve the first 15 error codes for exit codes of the abstract machine */
AMX_ERR_EXIT, /* forced exit */
AMX_ERR_ASSERT, /* assertion failed */
AMX_ERR_STACKERR, /* stack/heap collision */
AMX_ERR_BOUNDS, /* index out of bounds */
AMX_ERR_MEMACCESS, /* invalid memory access */
AMX_ERR_INVINSTR, /* invalid instruction */
AMX_ERR_STACKLOW, /* stack underflow */
AMX_ERR_HEAPLOW, /* heap underflow */
AMX_ERR_CALLBACK, /* no callback, or invalid callback */
AMX_ERR_NATIVE, /* native function failed */
AMX_ERR_DIVIDE, /* divide by zero */
AMX_ERR_SLEEP, /* go into sleepmode - code can be restarted */
AMX_ERR_MEMORY = 16, /* out of memory */
AMX_ERR_FORMAT, /* invalid file format */
AMX_ERR_VERSION, /* file is for a newer version of the AMX */
AMX_ERR_NOTFOUND, /* function not found */
AMX_ERR_INDEX, /* invalid index parameter (bad entry point) */
AMX_ERR_DEBUG, /* debugger cannot run */
AMX_ERR_INIT, /* AMX not initialized (or doubly initialized) */
AMX_ERR_USERDATA, /* unable to set user data field (table full) */
AMX_ERR_INIT_JIT, /* cannot initialize the JIT */
AMX_ERR_PARAMS, /* parameter error */
AMX_ERR_DOMAIN, /* domain error, expression result does not fit in range */
};
enum
{
DBG_INIT, /* query/initialize */
DBG_FILE, /* file number in curfile, filename in name */
DBG_LINE, /* line number in curline, file number in curfile */
DBG_SYMBOL, /* address in dbgaddr, class/type in dbgparam */
DBG_CLRSYM, /* stack address below which locals should be removed. stack address in stk */
DBG_CALL, /* function call, address jumped to in dbgaddr */
DBG_RETURN, /* function returns */
DBG_TERMINATE, /* program ends, code address in dbgaddr, reason in dbgparam */
DBG_SRANGE, /* symbol size and dimensions (arrays); level in dbgaddr (!); length in dbgparam */
DBG_SYMTAG, /* tag of the most recent symbol (if non-zero), tag in dbgparam */
};
#define AMX_FLAG_CHAR16 0x01 /* characters are 16-bit */
#define AMX_FLAG_DEBUG 0x02 /* symbolic info. available */
#define AMX_FLAG_COMPACT 0x04 /* compact encoding */
#define AMX_FLAG_BIGENDIAN 0x08 /* big endian encoding */
#define AMX_FLAG_NOCHECKS 0x10 /* no array bounds checking */
#define AMX_FLAG_BROWSE 0x4000 /* browsing/relocating or executing */
#define AMX_FLAG_RELOC 0x8000 /* jump/call addresses relocated */
#define AMX_EXEC_MAIN -1 /* start at program entry point */
#define AMX_EXEC_CONT -2 /* continue from last address */
#define AMX_USERTAG(a,b,c,d) ((a) | ((b)<<8) | ((long)(c)<<16) | ((long)(d)<<24))
#define AMX_EXPANDMARGIN 64
/* for native functions that use floating point parameters, the following
* two macros are convenient for casting a "cell" into a "float" type _without_
* changing the bit pattern
*/
#define amx_ftoc(f) ( * ((cell*)&f) ) /* float to cell */
#define amx_ctof(c) ( * ((float*)&c) ) /* cell to float */
#define amx_StrParam(amx,param,result) { \
cell *amx_cstr_; int amx_length_; \
amx_GetAddr((amx), (param), &amx_cstr_); \
amx_StrLen(amx_cstr_, &amx_length_); \
if (amx_length_ > 0 && \
((result) = (char *)alloca(amx_length_ + 1))) \
amx_GetString((result), amx_cstr_); \
else (result) = NULL; \
}
#endif /* __AMX_H */
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