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1.1 root 1: /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2: *
3: * ***** BEGIN LICENSE BLOCK *****
4: * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5: *
6: * The contents of this file are subject to the Mozilla Public License Version
7: * 1.1 (the "License"); you may not use this file except in compliance with
8: * the License. You may obtain a copy of the License at
9: * http://www.mozilla.org/MPL/
10: *
11: * Software distributed under the License is distributed on an "AS IS" basis,
12: * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13: * for the specific language governing rights and limitations under the
14: * License.
15: *
16: * The Original Code is Mozilla Communicator client code, released
17: * March 31, 1998.
18: *
19: * The Initial Developer of the Original Code is
20: * Netscape Communications Corporation.
21: * Portions created by the Initial Developer are Copyright (C) 1998
22: * the Initial Developer. All Rights Reserved.
23: *
24: * Contributor(s):
25: *
26: * Alternatively, the contents of this file may be used under the terms of
27: * either of the GNU General Public License Version 2 or later (the "GPL"),
28: * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29: * in which case the provisions of the GPL or the LGPL are applicable instead
30: * of those above. If you wish to allow use of your version of this file only
31: * under the terms of either the GPL or the LGPL, and not to allow others to
32: * use your version of this file under the terms of the MPL, indicate your
33: * decision by deleting the provisions above and replace them with the notice
34: * and other provisions required by the GPL or the LGPL. If you do not delete
35: * the provisions above, a recipient may use your version of this file under
36: * the terms of any one of the MPL, the GPL or the LGPL.
37: *
38: * ***** END LICENSE BLOCK ***** */
39:
40: #ifndef jsopcode_h___
41: #define jsopcode_h___
42: /*
43: * JS bytecode definitions.
44: */
45: #include <stddef.h>
46: #include "jsprvtd.h"
47: #include "jspubtd.h"
48:
49: JS_BEGIN_EXTERN_C
50:
51: /*
52: * JS operation bytecodes.
53: */
54: typedef enum JSOp {
55: #define OPDEF(op,val,name,token,length,nuses,ndefs,prec,format) \
56: op = val,
57: #include "jsopcode.tbl"
58: #undef OPDEF
59: JSOP_LIMIT
60: } JSOp;
61:
62: /*
63: * JS bytecode formats.
64: */
65: #define JOF_BYTE 0 /* single bytecode, no immediates */
66: #define JOF_JUMP 1 /* signed 16-bit jump offset immediate */
67: #define JOF_CONST 2 /* unsigned 16-bit constant pool index */
68: #define JOF_UINT16 3 /* unsigned 16-bit immediate operand */
69: #define JOF_TABLESWITCH 4 /* table switch */
70: #define JOF_LOOKUPSWITCH 5 /* lookup switch */
71: #define JOF_QARG 6 /* quickened get/set function argument ops */
72: #define JOF_QVAR 7 /* quickened get/set local variable ops */
73: #define JOF_DEFLOCALVAR 8 /* define local var with initial value */
74: #define JOF_JUMPX 9 /* signed 32-bit jump offset immediate */
75: #define JOF_TABLESWITCHX 10 /* extended (32-bit offset) table switch */
76: #define JOF_LOOKUPSWITCHX 11 /* extended (32-bit offset) lookup switch */
77: #define JOF_TYPEMASK 0x000f /* mask for above immediate types */
78: #define JOF_NAME 0x0010 /* name operation */
79: #define JOF_PROP 0x0020 /* obj.prop operation */
80: #define JOF_ELEM 0x0030 /* obj[index] operation */
81: #define JOF_MODEMASK 0x0030 /* mask for above addressing modes */
82: #define JOF_SET 0x0040 /* set (i.e., assignment) operation */
83: #define JOF_DEL 0x0080 /* delete operation */
84: #define JOF_DEC 0x0100 /* decrement (--, not ++) opcode */
85: #define JOF_INC 0x0200 /* increment (++, not --) opcode */
86: #define JOF_INCDEC 0x0300 /* increment or decrement opcode */
87: #define JOF_POST 0x0400 /* postorder increment or decrement */
88: #define JOF_IMPORT 0x0800 /* import property op */
89: #define JOF_FOR 0x1000 /* for-in property op */
90: #define JOF_ASSIGNING JOF_SET /* hint for JSClass.resolve, used for ops
91: that do simplex assignment */
92: #define JOF_DETECTING 0x2000 /* object detection flag for JSNewResolveOp */
93: #define JOF_BACKPATCH 0x4000 /* backpatch placeholder during codegen */
94: #define JOF_LEFTASSOC 0x8000 /* left-associative operator */
95: #define JOF_DECLARING 0x10000 /* var, const, or function declaration op */
96:
97: #define JOF_TYPE_IS_EXTENDED_JUMP(t) \
98: ((unsigned)((t) - JOF_JUMPX) <= (unsigned)(JOF_LOOKUPSWITCHX - JOF_JUMPX))
99:
100: /*
101: * Immediate operand getters, setters, and bounds.
102: */
103:
104: /* Short (2-byte signed offset) relative jump macros. */
105: #define JUMP_OFFSET_LEN 2
106: #define JUMP_OFFSET_HI(off) ((jsbytecode)((off) >> 8))
107: #define JUMP_OFFSET_LO(off) ((jsbytecode)(off))
108: #define GET_JUMP_OFFSET(pc) ((int16)(((pc)[1] << 8) | (pc)[2]))
109: #define SET_JUMP_OFFSET(pc,off) ((pc)[1] = JUMP_OFFSET_HI(off), \
110: (pc)[2] = JUMP_OFFSET_LO(off))
111: #define JUMP_OFFSET_MIN ((int16)0x8000)
112: #define JUMP_OFFSET_MAX ((int16)0x7fff)
113:
114: /*
115: * When a short jump won't hold a relative offset, its 2-byte immediate offset
116: * operand is an unsigned index of a span-dependency record, maintained until
117: * code generation finishes -- after which some (but we hope not nearly all)
118: * span-dependent jumps must be extended (see OptimizeSpanDeps in jsemit.c).
119: *
120: * If the span-dependency record index overflows SPANDEP_INDEX_MAX, the jump
121: * offset will contain SPANDEP_INDEX_HUGE, indicating that the record must be
122: * found (via binary search) by its "before span-dependency optimization" pc
123: * offset (from script main entry point).
124: */
125: #define GET_SPANDEP_INDEX(pc) ((uint16)(((pc)[1] << 8) | (pc)[2]))
126: #define SET_SPANDEP_INDEX(pc,i) ((pc)[1] = JUMP_OFFSET_HI(i), \
127: (pc)[2] = JUMP_OFFSET_LO(i))
128: #define SPANDEP_INDEX_MAX ((uint16)0xfffe)
129: #define SPANDEP_INDEX_HUGE ((uint16)0xffff)
130:
131: /* Ultimately, if short jumps won't do, emit long (4-byte signed) offsets. */
132: #define JUMPX_OFFSET_LEN 4
133: #define JUMPX_OFFSET_B3(off) ((jsbytecode)((off) >> 24))
134: #define JUMPX_OFFSET_B2(off) ((jsbytecode)((off) >> 16))
135: #define JUMPX_OFFSET_B1(off) ((jsbytecode)((off) >> 8))
136: #define JUMPX_OFFSET_B0(off) ((jsbytecode)(off))
137: #define GET_JUMPX_OFFSET(pc) ((int32)(((pc)[1] << 24) | ((pc)[2] << 16) \
138: | ((pc)[3] << 8) | (pc)[4]))
139: #define SET_JUMPX_OFFSET(pc,off)((pc)[1] = JUMPX_OFFSET_B3(off), \
140: (pc)[2] = JUMPX_OFFSET_B2(off), \
141: (pc)[3] = JUMPX_OFFSET_B1(off), \
142: (pc)[4] = JUMPX_OFFSET_B0(off))
143: #define JUMPX_OFFSET_MIN ((int32)0x80000000)
144: #define JUMPX_OFFSET_MAX ((int32)0x7fffffff)
145:
146: /* A literal is indexed by a per-script atom map. */
147: #define ATOM_INDEX_LEN 2
148: #define ATOM_INDEX_HI(index) ((jsbytecode)((index) >> 8))
149: #define ATOM_INDEX_LO(index) ((jsbytecode)(index))
150: #define GET_ATOM_INDEX(pc) ((jsatomid)(((pc)[1] << 8) | (pc)[2]))
151: #define SET_ATOM_INDEX(pc,index)((pc)[1] = ATOM_INDEX_HI(index), \
152: (pc)[2] = ATOM_INDEX_LO(index))
153: #define GET_ATOM(cx,script,pc) js_GetAtom((cx), &(script)->atomMap, \
154: GET_ATOM_INDEX(pc))
155: #define ATOM_INDEX_LIMIT_LOG2 16
156: #define ATOM_INDEX_LIMIT ((uint32)1 << ATOM_INDEX_LIMIT_LOG2)
157:
158: /* Actual argument count operand format helpers. */
159: #define ARGC_HI(argc) ((jsbytecode)((argc) >> 8))
160: #define ARGC_LO(argc) ((jsbytecode)(argc))
161: #define GET_ARGC(pc) ((uintN)(((pc)[1] << 8) | (pc)[2]))
162: #define ARGC_LIMIT ((uint32)1 << 16)
163:
164: /* Synonyms for quick JOF_QARG and JOF_QVAR bytecodes. */
165: #define GET_ARGNO(pc) GET_ARGC(pc)
166: #define SET_ARGNO(pc,argno) SET_JUMP_OFFSET(pc,argno)
167: #define ARGNO_LEN JUMP_OFFSET_LEN
168: #define GET_VARNO(pc) GET_ARGC(pc)
169: #define SET_VARNO(pc,varno) SET_JUMP_OFFSET(pc,varno)
170: #define VARNO_LEN JUMP_OFFSET_LEN
171:
172: struct JSCodeSpec {
173: const char *name; /* JS bytecode name */
174: const char *token; /* JS source literal or null */
175: int8 length; /* length including opcode byte */
176: int8 nuses; /* arity, -1 if variadic */
177: int8 ndefs; /* number of stack results */
178: uint8 prec; /* operator precedence */
179: uint32 format; /* immediate operand format */
180: };
181:
182: extern const char js_const_str[];
183: extern const char js_var_str[];
184: extern const char js_function_str[];
185: extern const char js_in_str[];
186: extern const char js_instanceof_str[];
187: extern const char js_new_str[];
188: extern const char js_delete_str[];
189: extern const char js_typeof_str[];
190: extern const char js_void_str[];
191: extern const char js_null_str[];
192: extern const char js_this_str[];
193: extern const char js_false_str[];
194: extern const char js_true_str[];
195: extern const JSCodeSpec js_CodeSpec[];
196: extern uintN js_NumCodeSpecs;
197: extern const jschar js_EscapeMap[];
198:
199: /*
200: * Return a GC'ed string containing the chars in str, with any non-printing
201: * chars or quotes (' or " as specified by the quote argument) escaped, and
202: * with the quote character at the beginning and end of the result string.
203: */
204: extern JSString *
205: js_QuoteString(JSContext *cx, JSString *str, jschar quote);
206:
207: /*
208: * JSPrinter operations, for printf style message formatting. The return
209: * value from js_GetPrinterOutput() is the printer's cumulative output, in
210: * a GC'ed string.
211: */
212: extern JSPrinter *
213: js_NewPrinter(JSContext *cx, const char *name, uintN indent, JSBool pretty);
214:
215: extern void
216: js_DestroyPrinter(JSPrinter *jp);
217:
218: extern JSString *
219: js_GetPrinterOutput(JSPrinter *jp);
220:
221: extern int
222: js_printf(JSPrinter *jp, const char *format, ...);
223:
224: extern JSBool
225: js_puts(JSPrinter *jp, const char *s);
226:
227: #ifdef DEBUG
228: /*
229: * Disassemblers, for debugging only.
230: */
231: #include <stdio.h>
232:
233: extern JS_FRIEND_API(void)
234: js_Disassemble(JSContext *cx, JSScript *script, JSBool lines, FILE *fp);
235:
236: extern JS_FRIEND_API(uintN)
237: js_Disassemble1(JSContext *cx, JSScript *script, jsbytecode *pc, uintN loc,
238: JSBool lines, FILE *fp);
239: #endif /* DEBUG */
240:
241: /*
242: * Decompilers, for script, function, and expression pretty-printing.
243: */
244: extern JSBool
245: js_DecompileCode(JSPrinter *jp, JSScript *script, jsbytecode *pc, uintN len);
246:
247: extern JSBool
248: js_DecompileScript(JSPrinter *jp, JSScript *script);
249:
250: extern JSBool
251: js_DecompileFunctionBody(JSPrinter *jp, JSFunction *fun);
252:
253: extern JSBool
254: js_DecompileFunction(JSPrinter *jp, JSFunction *fun);
255:
256: /*
257: * Find the source expression that resulted in v, and return a new string
258: * containing it. Fall back on v's string conversion (fallback) if we can't
259: * find the bytecode that generated and pushed v on the operand stack.
260: *
261: * Search the current stack frame if spindex is JSDVG_SEARCH_STACK. Don't
262: * look for v on the stack if spindex is JSDVG_IGNORE_STACK. Otherwise,
263: * spindex is the negative index of v, measured from cx->fp->sp, or from a
264: * lower frame's sp if cx->fp is native.
265: */
266: extern JSString *
267: js_DecompileValueGenerator(JSContext *cx, intN spindex, jsval v,
268: JSString *fallback);
269:
270: #define JSDVG_IGNORE_STACK 0
271: #define JSDVG_SEARCH_STACK 1
272:
273: JS_END_EXTERN_C
274:
275: #endif /* jsopcode_h___ */
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