gecko-dev/js/ref/jsopcode.h

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6.7 KiB
C

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef jsopcode_h___
#define jsopcode_h___
/*
* JS bytecode definitions.
*/
#include <stddef.h>
#include "jsprvtd.h"
#include "jspubtd.h"
PR_BEGIN_EXTERN_C
/*
* JS operation bytecodes.
*/
typedef enum JSOp {
#define OPDEF(op,val,name,token,length,nuses,ndefs,prec,format) \
op = val,
#include "jsopcode.def"
#undef OPDEF
JSOP_LIMIT
} JSOp;
/*
* JS bytecode formats.
*/
#define JOF_BYTE 0 /* single bytecode, no immediates */
#define JOF_JUMP 1 /* signed 16-bit jump offset immediate */
#define JOF_CONST 2 /* unsigned 16-bit constant pool index */
#define JOF_UINT16 3 /* unsigned 16-bit immediate operand */
#define JOF_TABLESWITCH 4 /* table switch */
#define JOF_LOOKUPSWITCH 5 /* lookup switch */
#define JOF_QARG 6 /* quickened get/set function argument ops */
#define JOF_QVAR 7 /* quickened get/set local variable ops */
#define JOF_TYPEMASK 0x000f /* mask for above immediate types */
#define JOF_NAME 0x0010 /* name operation */
#define JOF_PROP 0x0020 /* obj.prop operation */
#define JOF_ELEM 0x0030 /* obj[index] operation */
#define JOF_MODEMASK 0x0030 /* mask for above addressing modes */
#define JOF_SET 0x0040 /* set (i.e., assignment) operation */
#define JOF_DEL 0x0080 /* delete operation */
#define JOF_DEC 0x0100 /* decrement (--, not ++) opcode */
#define JOF_INC 0x0200 /* increment (++, not --) opcode */
#define JOF_INCDEC 0x0300 /* increment or decrement opcode */
#define JOF_POST 0x0400 /* postorder increment or decrement */
#define JOF_IMPORT 0x0800 /* import property op */
#define JOF_FOR2 0x1000 /* new for/in loop bytecodes */
/*
* Immediate operand getters, setters, and bounds.
*/
#define JUMP_OFFSET_LEN 2
#define JUMP_OFFSET_HI(off) ((jsbytecode)((off) >> 8))
#define JUMP_OFFSET_LO(off) ((jsbytecode)(off))
#define GET_JUMP_OFFSET(pc) ((int16)(((pc)[1] << 8) | (pc)[2]))
#define SET_JUMP_OFFSET(pc,off) ((pc)[1] = JUMP_OFFSET_HI(off), \
(pc)[2] = JUMP_OFFSET_LO(off))
#define JUMP_OFFSET_MIN ((int16)0x8000)
#define JUMP_OFFSET_MAX ((int16)0x7fff)
#define ATOM_INDEX_LEN 2
#define ATOM_INDEX_HI(index) ((jsbytecode)((index) >> 8))
#define ATOM_INDEX_LO(index) ((jsbytecode)(index))
#define GET_ATOM_INDEX(pc) (((pc)[1] << 8) | (pc)[2])
#define SET_ATOM_INDEX(pc,index)((pc)[1] = ATOM_INDEX_HI(index), \
(pc)[2] = ATOM_INDEX_LO(index))
#define GET_ATOM(cx,script,pc) js_GetAtom((cx), &(script)->atomMap, \
GET_ATOM_INDEX(pc))
#define ATOM_INDEX_LIMIT_LOG2 16
#define ATOM_INDEX_LIMIT ((uint32)1 << ATOM_INDEX_LIMIT_LOG2)
#define ARGC_HI(argc) ((jsbytecode)((argc) >> 8))
#define ARGC_LO(argc) ((jsbytecode)(argc))
#define GET_ARGC(pc) (((pc)[1] << 8) | (pc)[2])
#define ARGC_LIMIT ((uint32)1 << 16)
/* Synonyms for quick JOF_QARG and JOF_QVAR bytecodes. */
#define GET_ARGNO(pc) GET_ARGC(pc)
#define SET_ARGNO(pc,argno) SET_JUMP_OFFSET(pc,argno)
#define GET_VARNO(pc) GET_ARGC(pc)
#define SET_VARNO(pc,varno) SET_JUMP_OFFSET(pc,varno)
struct JSCodeSpec {
const char *name; /* JS bytecode name */
const char *token; /* JS source literal or null */
int8 length; /* length including opcode byte */
int8 nuses; /* arity, -1 if variadic */
int8 ndefs; /* number of stack results */
uint8 prec; /* operator precedence */
uint32 format; /* immediate operand format */
};
extern char js_in_str[];
extern char js_instanceof_str[];
extern char js_new_str[];
extern char js_delete_str[];
extern char js_typeof_str[];
extern char js_void_str[];
extern char js_null_str[];
extern char js_this_str[];
extern char js_false_str[];
extern char js_true_str[];
extern JSCodeSpec js_CodeSpec[];
extern uintN js_NumCodeSpecs;
extern jschar js_EscapeMap[];
/*
* Return a GC'ed string containing the chars in str, with any non-printing
* chars or quotes (' or " as specified by the quote argument) escaped, and
* with the quote character at the beginning and end of the result string.
*/
extern JSString *
js_QuoteString(JSContext *cx, JSString *str, jschar quote);
/*
* JSPrinter operations, for printf style message formatting. The return
* value from js_GetPrinterOutput() is the printer's cumulative output, in
* a GC'ed string.
*/
extern JSPrinter *
js_NewPrinter(JSContext *cx, const char *name, uintN indent);
extern void
js_DestroyPrinter(JSPrinter *jp);
extern JSString *
js_GetPrinterOutput(JSPrinter *jp);
extern int
js_printf(JSPrinter *jp, char *format, ...);
extern JSBool
js_puts(JSPrinter *jp, char *s);
#ifdef DEBUG
/*
* Disassemblers, for debugging only.
*/
#include <stdio.h>
extern JS_FRIEND_API(void)
js_Disassemble(JSContext *cx, JSScript *script, JSBool lines, FILE *fp);
extern JS_FRIEND_API(uintN)
js_Disassemble1(JSContext *cx, JSScript *script, jsbytecode *pc, uintN loc,
JSBool lines, FILE *fp);
#endif /* DEBUG */
/*
* Decompilers, for script, function, and expression pretty-printing.
*/
extern JSBool
js_DecompileCode(JSPrinter *jp, JSScript *script, jsbytecode *pc, uintN len);
extern JSBool
js_DecompileScript(JSPrinter *jp, JSScript *script);
extern JSBool
js_DecompileFunction(JSPrinter *jp, JSFunction *fun, JSBool newlines);
/*
* Find the source expression that resulted in v, and return a new string
* containing it. Fall back on v's string conversion if we can't find the
* bytecode that generated and pushed v on the operand stack.
*/
extern JSString *
js_DecompileValueGenerator(JSContext *cx, jsval v, JSString *fallback);
PR_END_EXTERN_C
#endif /* jsopcode_h___ */