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Diffstat (limited to 'src/third_party/js-1.7/jsopcode.h')
| -rw-r--r-- | src/third_party/js-1.7/jsopcode.h | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/src/third_party/js-1.7/jsopcode.h b/src/third_party/js-1.7/jsopcode.h new file mode 100644 index 00000000000..3f7e1de9d5c --- /dev/null +++ b/src/third_party/js-1.7/jsopcode.h @@ -0,0 +1,318 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- + * + * ***** BEGIN LICENSE BLOCK ***** + * Version: MPL 1.1/GPL 2.0/LGPL 2.1 + * + * The contents of this file are subject to the Mozilla Public License Version + * 1.1 (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * Software distributed under the License is distributed on an "AS IS" basis, + * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License + * for the specific language governing rights and limitations under the + * License. + * + * The Original Code is Mozilla Communicator client code, released + * March 31, 1998. + * + * The Initial Developer of the Original Code is + * Netscape Communications Corporation. + * Portions created by the Initial Developer are Copyright (C) 1998 + * the Initial Developer. All Rights Reserved. + * + * Contributor(s): + * + * Alternatively, the contents of this file may be used under the terms of + * either of the GNU General Public License Version 2 or later (the "GPL"), + * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), + * in which case the provisions of the GPL or the LGPL are applicable instead + * of those above. If you wish to allow use of your version of this file only + * under the terms of either the GPL or the LGPL, and not to allow others to + * use your version of this file under the terms of the MPL, indicate your + * decision by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL or the LGPL. If you do not delete + * the provisions above, a recipient may use your version of this file under + * the terms of any one of the MPL, the GPL or the LGPL. + * + * ***** END LICENSE BLOCK ***** */ + +#ifndef jsopcode_h___ +#define jsopcode_h___ +/* + * JS bytecode definitions. + */ +#include <stddef.h> +#include "jsprvtd.h" +#include "jspubtd.h" +#include "jsutil.h" + +JS_BEGIN_EXTERN_C + +/* + * JS operation bytecodes. + */ +typedef enum JSOp { +#define OPDEF(op,val,name,token,length,nuses,ndefs,prec,format) \ + op = val, +#include "jsopcode.tbl" +#undef OPDEF + JSOP_LIMIT +} JSOp; + +typedef enum JSOpLength { +#define OPDEF(op,val,name,token,length,nuses,ndefs,prec,format) \ + op##_LENGTH = length, +#include "jsopcode.tbl" +#undef OPDEF + JSOP_LIMIT_LENGTH +} JSOpLength; + +/* + * 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_INDEXCONST 8 /* uint16 slot index + constant pool index */ +#define JOF_JUMPX 9 /* signed 32-bit jump offset immediate */ +#define JOF_TABLESWITCHX 10 /* extended (32-bit offset) table switch */ +#define JOF_LOOKUPSWITCHX 11 /* extended (32-bit offset) lookup switch */ +#define JOF_UINT24 12 /* extended unsigned 24-bit literal (index) */ +#define JOF_LITOPX 13 /* JOF_UINT24 followed by op being extended, + where op if JOF_CONST has no unsigned 16- + bit immediate operand */ +#define JOF_LOCAL 14 /* block-local operand stack variable */ +#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_FOR 0x1000 /* for-in property op */ +#define JOF_ASSIGNING JOF_SET /* hint for JSClass.resolve, used for ops + that do simplex assignment */ +#define JOF_DETECTING 0x2000 /* object detection flag for JSNewResolveOp */ +#define JOF_BACKPATCH 0x4000 /* backpatch placeholder during codegen */ +#define JOF_LEFTASSOC 0x8000 /* left-associative operator */ +#define JOF_DECLARING 0x10000 /* var, const, or function declaration op */ +#define JOF_XMLNAME 0x20000 /* XML name: *, a::b, @a, @a::b, etc. */ + +#define JOF_TYPE_IS_EXTENDED_JUMP(t) \ + ((unsigned)((t) - JOF_JUMPX) <= (unsigned)(JOF_LOOKUPSWITCHX - JOF_JUMPX)) + +/* + * Immediate operand getters, setters, and bounds. + */ + +/* Short (2-byte signed offset) relative jump macros. */ +#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) + +/* + * When a short jump won't hold a relative offset, its 2-byte immediate offset + * operand is an unsigned index of a span-dependency record, maintained until + * code generation finishes -- after which some (but we hope not nearly all) + * span-dependent jumps must be extended (see OptimizeSpanDeps in jsemit.c). + * + * If the span-dependency record index overflows SPANDEP_INDEX_MAX, the jump + * offset will contain SPANDEP_INDEX_HUGE, indicating that the record must be + * found (via binary search) by its "before span-dependency optimization" pc + * offset (from script main entry point). + */ +#define GET_SPANDEP_INDEX(pc) ((uint16)(((pc)[1] << 8) | (pc)[2])) +#define SET_SPANDEP_INDEX(pc,i) ((pc)[1] = JUMP_OFFSET_HI(i), \ + (pc)[2] = JUMP_OFFSET_LO(i)) +#define SPANDEP_INDEX_MAX ((uint16)0xfffe) +#define SPANDEP_INDEX_HUGE ((uint16)0xffff) + +/* Ultimately, if short jumps won't do, emit long (4-byte signed) offsets. */ +#define JUMPX_OFFSET_LEN 4 +#define JUMPX_OFFSET_B3(off) ((jsbytecode)((off) >> 24)) +#define JUMPX_OFFSET_B2(off) ((jsbytecode)((off) >> 16)) +#define JUMPX_OFFSET_B1(off) ((jsbytecode)((off) >> 8)) +#define JUMPX_OFFSET_B0(off) ((jsbytecode)(off)) +#define GET_JUMPX_OFFSET(pc) ((int32)(((pc)[1] << 24) | ((pc)[2] << 16) \ + | ((pc)[3] << 8) | (pc)[4])) +#define SET_JUMPX_OFFSET(pc,off)((pc)[1] = JUMPX_OFFSET_B3(off), \ + (pc)[2] = JUMPX_OFFSET_B2(off), \ + (pc)[3] = JUMPX_OFFSET_B1(off), \ + (pc)[4] = JUMPX_OFFSET_B0(off)) +#define JUMPX_OFFSET_MIN ((int32)0x80000000) +#define JUMPX_OFFSET_MAX ((int32)0x7fffffff) + +/* + * A literal is indexed by a per-script atom map. Most scripts have relatively + * few literals, so the standard JOF_CONST format specifies a fixed 16 bits of + * immediate operand index. A script with more than 64K literals must push all + * high-indexed literals on the stack using JSOP_LITERAL, then use JOF_ELEM ops + * instead of JOF_PROP, etc. + */ +#define ATOM_INDEX_LEN 2 +#define ATOM_INDEX_HI(i) ((jsbytecode)((i) >> 8)) +#define ATOM_INDEX_LO(i) ((jsbytecode)(i)) +#define GET_ATOM_INDEX(pc) ((jsatomid)(((pc)[1] << 8) | (pc)[2])) +#define SET_ATOM_INDEX(pc,i) ((pc)[1] = ATOM_INDEX_HI(i), \ + (pc)[2] = ATOM_INDEX_LO(i)) +#define GET_ATOM(cx,script,pc) js_GetAtom((cx), &(script)->atomMap, \ + GET_ATOM_INDEX(pc)) + +/* A full atom index for JSOP_UINT24 uses 24 bits of immediate operand. */ +#define UINT24_HI(i) ((jsbytecode)((i) >> 16)) +#define UINT24_MID(i) ((jsbytecode)((i) >> 8)) +#define UINT24_LO(i) ((jsbytecode)(i)) +#define GET_UINT24(pc) ((jsatomid)(((pc)[1] << 16) | \ + ((pc)[2] << 8) | \ + (pc)[3])) +#define SET_UINT24(pc,i) ((pc)[1] = UINT24_HI(i), \ + (pc)[2] = UINT24_MID(i), \ + (pc)[3] = UINT24_LO(i)) + +/* Same format for JSOP_LITERAL, etc., but future-proof with different names. */ +#define LITERAL_INDEX_LEN 3 +#define LITERAL_INDEX_HI(i) UINT24_HI(i) +#define LITERAL_INDEX_MID(i) UINT24_MID(i) +#define LITERAL_INDEX_LO(i) UINT24_LO(i) +#define GET_LITERAL_INDEX(pc) GET_UINT24(pc) +#define SET_LITERAL_INDEX(pc,i) SET_UINT24(pc,i) + +/* Atom index limit is determined by SN_3BYTE_OFFSET_FLAG, see jsemit.h. */ +#define ATOM_INDEX_LIMIT_LOG2 23 +#define ATOM_INDEX_LIMIT ((uint32)1 << ATOM_INDEX_LIMIT_LOG2) + +JS_STATIC_ASSERT(sizeof(jsatomid) * JS_BITS_PER_BYTE >= + ATOM_INDEX_LIMIT_LOG2 + 1); + +/* Common uint16 immediate format helpers. */ +#define UINT16_HI(i) ((jsbytecode)((i) >> 8)) +#define UINT16_LO(i) ((jsbytecode)(i)) +#define GET_UINT16(pc) ((uintN)(((pc)[1] << 8) | (pc)[2])) +#define SET_UINT16(pc,i) ((pc)[1] = UINT16_HI(i), (pc)[2] = UINT16_LO(i)) +#define UINT16_LIMIT ((uintN)1 << 16) + +/* Actual argument count operand format helpers. */ +#define ARGC_HI(argc) UINT16_HI(argc) +#define ARGC_LO(argc) UINT16_LO(argc) +#define GET_ARGC(pc) GET_UINT16(pc) +#define ARGC_LIMIT UINT16_LIMIT + +/* Synonyms for quick JOF_QARG and JOF_QVAR bytecodes. */ +#define GET_ARGNO(pc) GET_UINT16(pc) +#define SET_ARGNO(pc,argno) SET_UINT16(pc,argno) +#define ARGNO_LEN 2 +#define ARGNO_LIMIT UINT16_LIMIT + +#define GET_VARNO(pc) GET_UINT16(pc) +#define SET_VARNO(pc,varno) SET_UINT16(pc,varno) +#define VARNO_LEN 2 +#define VARNO_LIMIT UINT16_LIMIT + +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 const JSCodeSpec js_CodeSpec[]; +extern uintN js_NumCodeSpecs; +extern const 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, JSBool pretty); + +extern void +js_DestroyPrinter(JSPrinter *jp); + +extern JSString * +js_GetPrinterOutput(JSPrinter *jp); + +extern int +js_printf(JSPrinter *jp, const char *format, ...); + +extern JSBool +js_puts(JSPrinter *jp, const char *s); + +#ifdef DEBUG +/* + * Disassemblers, for debugging only. + */ +#include <stdio.h> + +extern JS_FRIEND_API(JSBool) +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, + uintN pcdepth); + +extern JSBool +js_DecompileScript(JSPrinter *jp, JSScript *script); + +extern JSBool +js_DecompileFunctionBody(JSPrinter *jp, JSFunction *fun); + +extern JSBool +js_DecompileFunction(JSPrinter *jp, JSFunction *fun); + +/* + * Find the source expression that resulted in v, and return a new string + * containing it. Fall back on v's string conversion (fallback) if we can't + * find the bytecode that generated and pushed v on the operand stack. + * + * Search the current stack frame if spindex is JSDVG_SEARCH_STACK. Don't + * look for v on the stack if spindex is JSDVG_IGNORE_STACK. Otherwise, + * spindex is the negative index of v, measured from cx->fp->sp, or from a + * lower frame's sp if cx->fp is native. + */ +extern JSString * +js_DecompileValueGenerator(JSContext *cx, intN spindex, jsval v, + JSString *fallback); + +#define JSDVG_IGNORE_STACK 0 +#define JSDVG_SEARCH_STACK 1 + +JS_END_EXTERN_C + +#endif /* jsopcode_h___ */ |