/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set sw=4 ts=8 et tw=80:
*
* ***** 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 ***** */
/*
* JS bytecode descriptors, disassemblers, and decompilers.
*/
#include "jsstddef.h"
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "jstypes.h"
#include "jsarena.h" /* Added by JSIFY */
#include "jsutil.h" /* Added by JSIFY */
#include "jsdtoa.h"
#include "jsprf.h"
#include "jsapi.h"
#include "jsarray.h"
#include "jsatom.h"
#include "jscntxt.h"
#include "jsconfig.h"
#include "jsdbgapi.h"
#include "jsemit.h"
#include "jsfun.h"
#include "jslock.h"
#include "jsobj.h"
#include "jsopcode.h"
#include "jsregexp.h"
#include "jsscope.h"
#include "jsscript.h"
#include "jsstr.h"
const char js_const_str[] = "const";
const char js_var_str[] = "var";
const char js_function_str[] = "function";
const char js_in_str[] = "in";
const char js_instanceof_str[] = "instanceof";
const char js_new_str[] = "new";
const char js_delete_str[] = "delete";
const char js_typeof_str[] = "typeof";
const char js_void_str[] = "void";
const char js_null_str[] = "null";
const char js_this_str[] = "this";
const char js_false_str[] = "false";
const char js_true_str[] = "true";
const char js_default_str[] = "default";
const char *js_incop_str[] = {"++", "--"};
/* Pollute the namespace locally for MSVC Win16, but not for WatCom. */
#ifdef __WINDOWS_386__
#ifdef FAR
#undef FAR
#endif
#else /* !__WINDOWS_386__ */
#ifndef FAR
#define FAR
#endif
#endif /* !__WINDOWS_386__ */
const JSCodeSpec FAR js_CodeSpec[] = {
#define OPDEF(op,val,name,token,length,nuses,ndefs,prec,format) \
{name,token,length,nuses,ndefs,prec,format},
#include "jsopcode.tbl"
#undef OPDEF
};
uintN js_NumCodeSpecs = sizeof (js_CodeSpec) / sizeof js_CodeSpec[0];
/************************************************************************/
static ptrdiff_t
GetJumpOffset(jsbytecode *pc, jsbytecode *pc2)
{
uint32 type;
type = (js_CodeSpec[*pc].format & JOF_TYPEMASK);
if (JOF_TYPE_IS_EXTENDED_JUMP(type))
return GET_JUMPX_OFFSET(pc2);
return GET_JUMP_OFFSET(pc2);
}
#ifdef DEBUG
JS_FRIEND_API(JSBool)
js_Disassemble(JSContext *cx, JSScript *script, JSBool lines, FILE *fp)
{
jsbytecode *pc, *end;
uintN len;
pc = script->code;
end = pc + script->length;
while (pc < end) {
if (pc == script->main)
fputs("main:\n", fp);
len = js_Disassemble1(cx, script, pc,
PTRDIFF(pc, script->code, jsbytecode),
lines, fp);
if (!len)
return JS_FALSE;
pc += len;
}
return JS_TRUE;
}
JS_FRIEND_API(uintN)
js_Disassemble1(JSContext *cx, JSScript *script, jsbytecode *pc, uintN loc,
JSBool lines, FILE *fp)
{
JSOp op;
const JSCodeSpec *cs;
ptrdiff_t len, off, jmplen;
uint32 type;
JSAtom *atom;
JSString *str;
op = (JSOp)*pc;
if (op >= JSOP_LIMIT) {
char numBuf1[12], numBuf2[12];
JS_snprintf(numBuf1, sizeof numBuf1, "%d", op);
JS_snprintf(numBuf2, sizeof numBuf2, "%d", JSOP_LIMIT);
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BYTECODE_TOO_BIG, numBuf1, numBuf2);
return 0;
}
cs = &js_CodeSpec[op];
len = (ptrdiff_t) cs->length;
fprintf(fp, "%05u:", loc);
if (lines)
fprintf(fp, "%4u", JS_PCToLineNumber(cx, script, pc));
fprintf(fp, " %s", cs->name);
type = cs->format & JOF_TYPEMASK;
switch (type) {
case JOF_BYTE:
if (op == JSOP_TRAP) {
op = JS_GetTrapOpcode(cx, script, pc);
if (op == JSOP_LIMIT)
return 0;
len = (ptrdiff_t) js_CodeSpec[op].length;
}
break;
case JOF_JUMP:
case JOF_JUMPX:
off = GetJumpOffset(pc, pc);
fprintf(fp, " %u (%d)", loc + off, off);
break;
case JOF_CONST:
atom = GET_ATOM(cx, script, pc);
str = js_ValueToSource(cx, ATOM_KEY(atom));
if (!str)
return 0;
fprintf(fp, " %s", JS_GetStringBytes(str));
break;
case JOF_UINT16:
fprintf(fp, " %u", GET_ARGC(pc));
break;
#if JS_HAS_SWITCH_STATEMENT
case JOF_TABLESWITCH:
case JOF_TABLESWITCHX:
{
jsbytecode *pc2;
jsint i, low, high;
jmplen = (type == JOF_TABLESWITCH) ? JUMP_OFFSET_LEN
: JUMPX_OFFSET_LEN;
pc2 = pc;
off = GetJumpOffset(pc, pc2);
pc2 += jmplen;
low = GET_JUMP_OFFSET(pc2);
pc2 += JUMP_OFFSET_LEN;
high = GET_JUMP_OFFSET(pc2);
pc2 += JUMP_OFFSET_LEN;
fprintf(fp, " defaultOffset %d low %d high %d", off, low, high);
for (i = low; i <= high; i++) {
off = GetJumpOffset(pc, pc2);
fprintf(fp, "\n\t%d: %d", i, off);
pc2 += jmplen;
}
len = 1 + pc2 - pc;
break;
}
case JOF_LOOKUPSWITCH:
case JOF_LOOKUPSWITCHX:
{
jsbytecode *pc2;
jsatomid npairs;
jmplen = (type == JOF_LOOKUPSWITCH) ? JUMP_OFFSET_LEN
: JUMPX_OFFSET_LEN;
pc2 = pc;
off = GetJumpOffset(pc, pc2);
pc2 += jmplen;
npairs = GET_ATOM_INDEX(pc2);
pc2 += ATOM_INDEX_LEN;
fprintf(fp, " offset %d npairs %u", off, (uintN) npairs);
while (npairs) {
atom = GET_ATOM(cx, script, pc2);
pc2 += ATOM_INDEX_LEN;
off = GetJumpOffset(pc, pc2);
pc2 += jmplen;
str = js_ValueToSource(cx, ATOM_KEY(atom));
if (!str)
return 0;
fprintf(fp, "\n\t%s: %d", JS_GetStringBytes(str), off);
npairs--;
}
len = 1 + pc2 - pc;
break;
}
#endif /* JS_HAS_SWITCH_STATEMENT */
case JOF_QARG:
fprintf(fp, " %u", GET_ARGNO(pc));
break;
case JOF_QVAR:
fprintf(fp, " %u", GET_VARNO(pc));
break;
#if JS_HAS_LEXICAL_CLOSURE
case JOF_INDEXCONST:
fprintf(fp, " %u", GET_VARNO(pc));
pc += VARNO_LEN;
atom = GET_ATOM(cx, script, pc);
str = js_ValueToSource(cx, ATOM_KEY(atom));
if (!str)
return 0;
fprintf(fp, " %s", JS_GetStringBytes(str));
break;
#endif
case JOF_UINT24:
if (op == JSOP_FINDNAME) {
/* Special case to avoid a JOF_FINDNAME just for this op. */
atom = js_GetAtom(cx, &script->atomMap, GET_LITERAL_INDEX(pc));
str = js_ValueToSource(cx, ATOM_KEY(atom));
if (!str)
return 0;
fprintf(fp, " %s", JS_GetStringBytes(str));
break;
}
JS_ASSERT(op == JSOP_UINT24 || op == JSOP_LITERAL);
fprintf(fp, " %u", GET_LITERAL_INDEX(pc));
break;
case JOF_LITOPX:
atom = js_GetAtom(cx, &script->atomMap, GET_LITERAL_INDEX(pc));
str = js_ValueToSource(cx, ATOM_KEY(atom));
if (!str)
return 0;
/*
* Bytecode: JSOP_LITOPX <uint24> op [<varno> if JSOP_DEFLOCALFUN].
* Advance pc to point at op.
*/
pc += 1 + LITERAL_INDEX_LEN;
op = *pc;
cs = &js_CodeSpec[op];
fprintf(fp, " %s op %s", JS_GetStringBytes(str), cs->name);
#if JS_HAS_LEXICAL_CLOSURE
if ((cs->format & JOF_TYPEMASK) == JOF_INDEXCONST)
fprintf(fp, " %u", GET_VARNO(pc));
#endif
/*
* Set len to advance pc to skip op and any other immediates (namely,
* <varno> if JSOP_DEFLOCALFUN).
*/
JS_ASSERT(cs->length > ATOM_INDEX_LEN);
len = cs->length - ATOM_INDEX_LEN;
break;
default: {
char numBuf[12];
JS_snprintf(numBuf, sizeof numBuf, "%lx", (unsigned long) cs->format);
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_UNKNOWN_FORMAT, numBuf);
return 0;
}
}
fputs("\n", fp);
return len;
}
#endif /* DEBUG */
/************************************************************************/
/*
* Sprintf, but with unlimited and automatically allocated buffering.
*/
typedef struct Sprinter {
JSContext *context; /* context executing the decompiler */
JSArenaPool *pool; /* string allocation pool */
char *base; /* base address of buffer in pool */
size_t size; /* size of buffer allocated at base */
ptrdiff_t offset; /* offset of next free char in buffer */
} Sprinter;
#define INIT_SPRINTER(cx, sp, ap, off) \
((sp)->context = cx, (sp)->pool = ap, (sp)->base = NULL, (sp)->size = 0, \
(sp)->offset = off)
#define OFF2STR(sp,off) ((sp)->base + (off))
#define STR2OFF(sp,str) ((str) - (sp)->base)
#define RETRACT(sp,str) ((sp)->offset = STR2OFF(sp, str))
static JSBool
SprintAlloc(Sprinter *sp, size_t nb)
{
if (!sp->base) {
JS_ARENA_ALLOCATE_CAST(sp->base, char *, sp->pool, nb);
} else {
JS_ARENA_GROW_CAST(sp->base, char *, sp->pool, sp->size, nb);
}
if (!sp->base) {
JS_ReportOutOfMemory(sp->context);
return JS_FALSE;
}
sp->size += nb;
return JS_TRUE;
}
static ptrdiff_t
SprintPut(Sprinter *sp, const char *s, size_t len)
{
ptrdiff_t nb, offset;
char *bp;
/* Allocate space for s, including the '\0' at the end. */
nb = (sp->offset + len + 1) - sp->size;
if (nb > 0 && !SprintAlloc(sp, nb))
return -1;
/* Advance offset and copy s into sp's buffer. */
offset = sp->offset;
sp->offset += len;
bp = sp->base + offset;
memmove(bp, s, len);
bp[len] = 0;
return offset;
}
static ptrdiff_t
Sprint(Sprinter *sp, const char *format, ...)
{
va_list ap;
char *bp;
ptrdiff_t offset;
va_start(ap, format);
bp = JS_vsmprintf(format, ap); /* XXX vsaprintf */
va_end(ap);
if (!bp) {
JS_ReportOutOfMemory(sp->context);
return -1;
}
offset = SprintPut(sp, bp, strlen(bp));
free(bp);
return offset;
}
const jschar js_EscapeMap[] = {
'\b', 'b',
'\f', 'f',
'\n', 'n',
'\r', 'r',
'\t', 't',
'\v', 'v',
'"', '"',
'\'', '\'',
'\\', '\\',
0
};
static char *
QuoteString(Sprinter *sp, JSString *str, jschar quote)
{
ptrdiff_t off, len, nb;
const jschar *s, *t, *u, *z;
char *bp;
jschar c;
JSBool ok;
/* Sample off first for later return value pointer computation. */
off = sp->offset;
if (quote && Sprint(sp, "%c", (char)quote) < 0)
return NULL;
/* Loop control variables: z points at end of string sentinel. */
s = JSSTRING_CHARS(str);
z = s + JSSTRING_LENGTH(str);
for (t = s; t < z; s = ++t) {
/* Move t forward from s past un-quote-worthy characters. */
c = *t;
while (JS_ISPRINT(c) && c != quote && c != '\\' && !(c >> 8)) {
c = *++t;
if (t == z)
break;
}
len = PTRDIFF(t, s, jschar);
/* Allocate space for s, including the '\0' at the end. */
nb = (sp->offset + len + 1) - sp->size;
if (nb > 0 && !SprintAlloc(sp, nb))
return NULL;
/* Advance sp->offset and copy s into sp's buffer. */
bp = sp->base + sp->offset;
sp->offset += len;
while (--len >= 0)
*bp++ = (char) *s++;
*bp = '\0';
if (t == z)
break;
/* Use js_EscapeMap, \u, or \x only if necessary. */
if ((u = js_strchr(js_EscapeMap, c)) != NULL) {
ok = Sprint(sp, "\\%c", (char)u[1]) >= 0;
} else {
#ifdef JS_C_STRINGS_ARE_UTF8
/* If this is a surrogate pair, make sure to print the pair. */
if (c >= 0xD800 && c <= 0xDBFF) {
jschar buffer[3];
buffer[0] = c;
buffer[1] = *++t;
buffer[2] = 0;
if (t == z) {
ok = JS_FALSE;
break;
}
ok = Sprint(sp, "%hs", buffer) >= 0;
} else {
/* Print as UTF-8 string. */
ok = Sprint(sp, "%hc", c) >= 0;
}
#else
/* Use \uXXXX or \xXX if the string cannot be displayed as UTF-8. */
ok = Sprint(sp, (c >> 8) ? "\\u%04X" : "\\x%02X", c) >= 0;
#endif
}
if (!ok)
return NULL;
}
/* Sprint the closing quote and return the quoted string. */
if (quote && Sprint(sp, "%c", (char)quote) < 0)
return NULL;
/*
* If we haven't Sprint'd anything yet, Sprint an empty string so that
* the OFF2STR below gives a valid result.
*/
if (off == sp->offset && Sprint(sp, "") < 0)
return NULL;
return OFF2STR(sp, off);
}
JSString *
js_QuoteString(JSContext *cx, JSString *str, jschar quote)
{
void *mark;
Sprinter sprinter;
char *bytes;
JSString *escstr;
mark = JS_ARENA_MARK(&cx->tempPool);
INIT_SPRINTER(cx, &sprinter, &cx->tempPool, 0);
bytes = QuoteString(&sprinter, str, quote);
escstr = bytes ? JS_NewStringCopyZ(cx, bytes) : NULL;
JS_ARENA_RELEASE(&cx->tempPool, mark);
return escstr;
}
/************************************************************************/
struct JSPrinter {
Sprinter sprinter; /* base class state */
JSArenaPool pool; /* string allocation pool */
uintN indent; /* indentation in spaces */
JSPackedBool pretty; /* pretty-print: indent, use newlines */
JSPackedBool grouped; /* in parenthesized expression context */
JSScript *script; /* script being printed */
JSScope *scope; /* script function scope */
};
/*
* Hack another flag, a la JS_DONT_PRETTY_PRINT, into uintN indent parameters
* to functions such as js_DecompileFunction and js_NewPrinter. This time, as
* opposed to JS_DONT_PRETTY_PRINT back in the dark ages, we can assume that a
* uintN is at least 32 bits.
*/
#define JS_IN_GROUP_CONTEXT 0x10000
JSPrinter *
js_NewPrinter(JSContext *cx, const char *name, uintN indent, JSBool pretty)
{
JSPrinter *jp;
jp = (JSPrinter *) JS_malloc(cx, sizeof(JSPrinter));
if (!jp)
return NULL;
INIT_SPRINTER(cx, &jp->sprinter, &jp->pool, 0);
JS_InitArenaPool(&jp->pool, name, 256, 1);
jp->indent = indent & ~JS_IN_GROUP_CONTEXT;
jp->pretty = pretty;
jp->grouped = (indent & JS_IN_GROUP_CONTEXT) != 0;
jp->script = NULL;
jp->scope = NULL;
return jp;
}
void
js_DestroyPrinter(JSPrinter *jp)
{
JS_FinishArenaPool(&jp->pool);
JS_free(jp->sprinter.context, jp);
}
JSString *
js_GetPrinterOutput(JSPrinter *jp)
{
JSContext *cx;
JSString *str;
cx = jp->sprinter.context;
if (!jp->sprinter.base)
return cx->runtime->emptyString;
str = JS_NewStringCopyZ(cx, jp->sprinter.base);
if (!str)
return NULL;
JS_FreeArenaPool(&jp->pool);
INIT_SPRINTER(cx, &jp->sprinter, &jp->pool, 0);
return str;
}
int
js_printf(JSPrinter *jp, const char *format, ...)
{
va_list ap;
char *bp, *fp;
int cc;
if (*format == '\0')
return 0;
va_start(ap, format);
/* If pretty-printing, expand magic tab into a run of jp->indent spaces. */
if (*format == '\t') {
if (jp->pretty && Sprint(&jp->sprinter, "%*s", jp->indent, "") < 0)
return -1;
format++;
}
/* Suppress newlines (must be once per format, at the end) if not pretty. */
fp = NULL;
if (!jp->pretty && format[cc = strlen(format) - 1] == '\n') {
fp = JS_strdup(jp->sprinter.context, format);
if (!fp)
return -1;
fp[cc] = '\0';
format = fp;
}
/* Allocate temp space, convert format, and put. */
bp = JS_vsmprintf(format, ap); /* XXX vsaprintf */
if (fp) {
JS_free(jp->sprinter.context, fp);
format = NULL;
}
if (!bp) {
JS_ReportOutOfMemory(jp->sprinter.context);
return -1;
}
cc = strlen(bp);
if (SprintPut(&jp->sprinter, bp, (size_t)cc) < 0)
cc = -1;
free(bp);
va_end(ap);
return cc;
}
JSBool
js_puts(JSPrinter *jp, const char *s)
{
return SprintPut(&jp->sprinter, s, strlen(s)) >= 0;
}
/************************************************************************/
typedef struct SprintStack {
Sprinter sprinter; /* sprinter for postfix to infix buffering */
ptrdiff_t *offsets; /* stack of postfix string offsets */
jsbytecode *opcodes; /* parallel stack of JS opcodes */
uintN top; /* top of stack index */
JSPrinter *printer; /* permanent output goes here */
} SprintStack;
/* Gap between stacked strings to allow for insertion of parens and commas. */
#define PAREN_SLOP (2 + 1)
/*
* These pseudo-ops help js_DecompileValueGenerator decompile JSOP_SETNAME,
* JSOP_SETPROP, and JSOP_SETELEM, respectively. See the first assertion in
* PushOff.
*/
#define JSOP_GETPROP2 254
#define JSOP_GETELEM2 255
static JSBool
PushOff(SprintStack *ss, ptrdiff_t off, JSOp op)
{
uintN top;
#if JSOP_LIMIT > JSOP_GETPROP2
#error JSOP_LIMIT must be <= JSOP_GETPROP2
#endif
if (!SprintAlloc(&ss->sprinter, PAREN_SLOP))
return JS_FALSE;
/* ss->top points to the next free slot; be paranoid about overflow. */
top = ss->top;
JS_ASSERT(top < ss->printer->script->depth);
if (top >= ss->printer->script->depth) {
JS_ReportOutOfMemory(ss->sprinter.context);
return JS_FALSE;
}
/* The opcodes stack must contain real bytecodes that index js_CodeSpec. */
ss->offsets[top] = off;
ss->opcodes[top] = (op == JSOP_GETPROP2) ? JSOP_GETPROP
: (op == JSOP_GETELEM2) ? JSOP_GETELEM
: (jsbytecode) op;
ss->top = ++top;
ss->sprinter.offset += PAREN_SLOP;
return JS_TRUE;
}
static ptrdiff_t
PopOff(SprintStack *ss, JSOp op)
{
uintN top;
const JSCodeSpec *cs, *topcs;
ptrdiff_t off;
/* ss->top points to the next free slot; be paranoid about underflow. */
top = ss->top;
JS_ASSERT(top != 0);
if (top == 0)
return 0;
ss->top = --top;
topcs = &js_CodeSpec[ss->opcodes[top]];
cs = &js_CodeSpec[op];
if (topcs->prec != 0 && topcs->prec < cs->prec) {
ss->offsets[top] -= 2;
ss->sprinter.offset = ss->offsets[top];
off = Sprint(&ss->sprinter, "(%s)",
OFF2STR(&ss->sprinter, ss->sprinter.offset + 2));
} else {
off = ss->sprinter.offset = ss->offsets[top];
}
return off;
}
#if JS_HAS_SWITCH_STATEMENT
typedef struct TableEntry {
jsval key;
ptrdiff_t offset;
JSAtom *label;
jsint order; /* source order for stable tableswitch sort */
} TableEntry;
static int
CompareOffsets(const void *v1, const void *v2, void *arg)
{
const TableEntry *te1 = (const TableEntry *) v1,
*te2 = (const TableEntry *) v2;
if (te1->offset == te2->offset)
return (int) (te1->order - te2->order);
return (int) (te1->offset - te2->offset);
}
static JSBool
Decompile(SprintStack *ss, jsbytecode *pc, intN nb);
static JSBool
DecompileSwitch(SprintStack *ss, TableEntry *table, uintN tableLength,
jsbytecode *pc, ptrdiff_t switchLength,
ptrdiff_t defaultOffset, JSBool isCondSwitch)
{
JSContext *cx;
JSPrinter *jp;
char *lval, *rval;
uintN i;
ptrdiff_t diff, off, off2, caseExprOff;
jsval key;
JSString *str;
cx = ss->sprinter.context;
jp = ss->printer;
lval = OFF2STR(&ss->sprinter, PopOff(ss, JSOP_NOP));
js_printf(jp, "\tswitch (%s) {\n", lval);
if (tableLength) {
diff = table[0].offset - defaultOffset;
if (diff > 0) {
jp->indent += 2;
js_printf(jp, "\t%s:\n", js_default_str);
jp->indent += 2;
if (!Decompile(ss, pc + defaultOffset, diff))
return JS_FALSE;
jp->indent -= 4;
}
caseExprOff = isCondSwitch
? (ptrdiff_t) js_CodeSpec[JSOP_CONDSWITCH].length
: 0;
for (i = 0; i < tableLength; i++) {
off = table[i].offset;
off2 = (i + 1 < tableLength) ? table[i + 1].offset : switchLength;
key = table[i].key;
if (isCondSwitch) {
ptrdiff_t nextCaseExprOff;
/*
* key encodes the JSOP_CASE bytecode's offset from switchtop.
* The next case expression follows immediately, unless we are
* at the last case.
*/
nextCaseExprOff = (ptrdiff_t)JSVAL_TO_INT(key);
nextCaseExprOff += js_CodeSpec[pc[nextCaseExprOff]].length;
jp->indent += 2;
if (!Decompile(ss, pc + caseExprOff,
nextCaseExprOff - caseExprOff)) {
return JS_FALSE;
}
caseExprOff = nextCaseExprOff;
} else {
/*
* key comes from an atom, not the decompiler, so we need to
* quote it if it's a string literal. But if table[i].label
* is non-null, key was constant-propagated and label is the
* name of the const we should show as the case label. We set
* key to undefined so this identifier is escaped, if required
* by non-ASCII characters, but not quoted, by QuoteString.
*/
if (table[i].label) {
str = ATOM_TO_STRING(table[i].label);
key = JSVAL_VOID;
} else {
str = js_ValueToString(cx, key);
if (!str)
return JS_FALSE;
}
rval = QuoteString(&ss->sprinter, str,
(jschar)(JSVAL_IS_STRING(key) ? '"' : 0));
if (!rval)
return JS_FALSE;
RETRACT(&ss->sprinter, rval);
jp->indent += 2;
js_printf(jp, "\tcase %s:\n", rval);
}
jp->indent += 2;
if (off <= defaultOffset && defaultOffset < off2) {
diff = defaultOffset - off;
if (diff != 0) {
if (!Decompile(ss, pc + off, diff))
return JS_FALSE;
off = defaultOffset;
}
jp->indent -= 2;
js_printf(jp, "\t%s:\n", js_default_str);
jp->indent += 2;
}
if (!Decompile(ss, pc + off, off2 - off))
return JS_FALSE;
jp->indent -= 4;
}
}
if (defaultOffset == switchLength) {
jp->indent += 2;
js_printf(jp, "\t%s:;\n", js_default_str);
jp->indent -= 2;
}
js_printf(jp, "\t}\n");
return JS_TRUE;
}
#endif
static JSAtom *
GetSlotAtom(JSPrinter *jp, JSPropertyOp getter, uintN slot)
{
JSScope *scope;
JSScopeProperty *sprop;
JSObject *obj, *proto;
scope = jp->scope;
while (scope) {
for (sprop = SCOPE_LAST_PROP(scope); sprop; sprop = sprop->parent) {
if (sprop->getter != getter)
continue;
JS_ASSERT(sprop->flags & SPROP_HAS_SHORTID);
JS_ASSERT(JSID_IS_ATOM(sprop->id));
if ((uintN) sprop->shortid == slot)
return JSID_TO_ATOM(sprop->id);
}
obj = scope->object;
if (!obj)
break;
proto = OBJ_GET_PROTO(jp->sprinter.context, obj);
if (!proto)
break;
scope = OBJ_SCOPE(proto);
}
return NULL;
}
static const char *
VarPrefix(jssrcnote *sn)
{
if (sn) {
if (SN_TYPE(sn) == SRC_VAR)
return "var ";
if (SN_TYPE(sn) == SRC_CONST)
return "const ";
}
return "";
}
static JSBool
Decompile(SprintStack *ss, jsbytecode *pc, intN nb)
{
JSContext *cx;
JSPrinter *jp, *jp2;
jsbytecode *endpc, *done, *forelem_tail, *forelem_done;
ptrdiff_t tail, todo, len, oplen, cond, next;
JSOp op, lastop, saveop;
const JSCodeSpec *cs, *topcs;
jssrcnote *sn, *sn2;
const char *lval, *rval, *xval, *fmt;
jsint i, argc;
char **argv;
jsatomid atomIndex;
JSAtom *atom;
JSObject *obj;
JSFunction *fun;
JSString *str;
JSBool ok;
#if JS_HAS_XML_SUPPORT
JSBool foreach, inXML, quoteAttr;
#else
#define inXML JS_FALSE
#endif
jsval val;
static const char catch_cookie[] = "/*CATCH*/";
static const char with_cookie[] = "/*WITH*/";
/*
* Local macros
*/
#define DECOMPILE_CODE(pc,nb) if (!Decompile(ss, pc, nb)) return JS_FALSE
#define POP_STR() OFF2STR(&ss->sprinter, PopOff(ss, op))
#define LOCAL_ASSERT(expr) JS_ASSERT(expr); if (!(expr)) return JS_FALSE
/*
* Callers know that ATOM_IS_STRING(atom), and we leave it to the optimizer to
* common ATOM_TO_STRING(atom) here and near the call sites.
*/
#define ATOM_IS_IDENTIFIER(atom) \
(!ATOM_KEYWORD(atom) && js_IsIdentifier(ATOM_TO_STRING(atom)))
/*
* Given an atom already fetched from jp->script's atom map, quote/escape its
* string appropriately into rval, and select fmt from the quoted and unquoted
* alternatives.
*/
#define GET_QUOTE_AND_FMT(qfmt, ufmt, rval) \
JS_BEGIN_MACRO \
jschar quote_; \
if (!ATOM_IS_IDENTIFIER(atom)) { \
quote_ = '\''; \
fmt = qfmt; \
} else { \
quote_ = 0; \
fmt = ufmt; \
} \
rval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), quote_); \
if (!rval) \
return JS_FALSE; \
JS_END_MACRO
/*
* Get atom from jp->script's atom map, quote/escape its string appropriately
* into rval, and select fmt from the quoted and unquoted alternatives.
*/
#define GET_ATOM_QUOTE_AND_FMT(qfmt, ufmt, rval) \
JS_BEGIN_MACRO \
atom = GET_ATOM(cx, jp->script, pc); \
GET_QUOTE_AND_FMT(qfmt, ufmt, rval); \
JS_END_MACRO
cx = ss->sprinter.context;
jp = ss->printer;
endpc = pc + nb;
forelem_tail = forelem_done = NULL;
tail = -1;
todo = -2; /* NB: different from Sprint() error return. */
op = JSOP_NOP;
sn = NULL;
rval = NULL;
#if JS_HAS_XML_SUPPORT
foreach = inXML = quoteAttr = JS_FALSE;
#endif
while (pc < endpc) {
lastop = op;
op = saveop = (JSOp) *pc;
if (op >= JSOP_LIMIT) {
switch (op) {
case JSOP_GETPROP2:
saveop = JSOP_GETPROP;
break;
case JSOP_GETELEM2:
saveop = JSOP_GETELEM;
break;
default:;
}
}
cs = &js_CodeSpec[saveop];
len = oplen = cs->length;
if (cs->token) {
switch (cs->nuses) {
case 2:
rval = POP_STR();
lval = POP_STR();
sn = js_GetSrcNote(jp->script, pc);
if (sn && SN_TYPE(sn) == SRC_ASSIGNOP) {
/* Print only the right operand of the assignment-op. */
todo = SprintPut(&ss->sprinter, rval, strlen(rval));
} else if (!inXML) {
todo = Sprint(&ss->sprinter, "%s %s %s",
lval, cs->token, rval);
} else {
/* In XML, just concatenate the two operands. */
JS_ASSERT(op == JSOP_ADD);
todo = Sprint(&ss->sprinter, "%s%s", lval, rval);
}
break;
case 1:
rval = POP_STR();
todo = Sprint(&ss->sprinter, "%s%s", cs->token, rval);
break;
case 0:
todo = SprintPut(&ss->sprinter, cs->token, strlen(cs->token));
break;
default:
todo = -2;
break;
}
} else {
switch (op) {
#define BEGIN_LITOPX_CASE(OP) \
case OP: \
atomIndex = GET_ATOM_INDEX(pc); \
do_##OP: \
atom = js_GetAtom(cx, &jp->script->atomMap, atomIndex);
#define END_LITOPX_CASE \
break;
case JSOP_NOP:
/*
* Check for a do-while loop, a for-loop with an empty
* initializer part, a labeled statement, a function
* definition, or try/finally.
*/
sn = js_GetSrcNote(jp->script, pc);
todo = -2;
switch (sn ? SN_TYPE(sn) : SRC_NULL) {
#if JS_HAS_DO_WHILE_LOOP
case SRC_WHILE:
js_printf(jp, "\tdo {\n");
jp->indent += 4;
break;
#endif /* JS_HAS_DO_WHILE_LOOP */
case SRC_FOR:
rval = "";
do_forloop:
/* Skip the JSOP_NOP or JSOP_POP bytecode. */
pc++;
/* Get the cond, next, and loop-closing tail offsets. */
cond = js_GetSrcNoteOffset(sn, 0);
next = js_GetSrcNoteOffset(sn, 1);
tail = js_GetSrcNoteOffset(sn, 2);
LOCAL_ASSERT(tail + GetJumpOffset(pc+tail, pc+tail) == 0);
/* Print the keyword and the possibly empty init-part. */
js_printf(jp, "\tfor (%s;", rval);
if (pc[cond] == JSOP_IFEQ || pc[cond] == JSOP_IFEQX) {
/* Decompile the loop condition. */
DECOMPILE_CODE(pc, cond);
js_printf(jp, " %s", POP_STR());
}
/* Need a semicolon whether or not there was a cond. */
js_puts(jp, ";");
if (pc[next] != JSOP_GOTO && pc[next] != JSOP_GOTOX) {
/* Decompile the loop updater. */
DECOMPILE_CODE(pc + next, tail - next - 1);
js_printf(jp, " %s", POP_STR());
}
/* Do the loop body. */
js_printf(jp, ") {\n");
jp->indent += 4;
oplen = (cond) ? js_CodeSpec[pc[cond]].length : 0;
DECOMPILE_CODE(pc + cond + oplen, next - cond - oplen);
jp->indent -= 4;
js_printf(jp, "\t}\n");
/* Set len so pc skips over the entire loop. */
len = tail + js_CodeSpec[pc[tail]].length;
break;
case SRC_LABEL:
atom = js_GetAtom(cx, &jp->script->atomMap,
(jsatomid) js_GetSrcNoteOffset(sn, 0));
jp->indent -= 4;
rval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0);
if (!rval)
return JS_FALSE;
RETRACT(&ss->sprinter, rval);
js_printf(jp, "\t%s:\n", rval);
jp->indent += 4;
break;
case SRC_LABELBRACE:
atom = js_GetAtom(cx, &jp->script->atomMap,
(jsatomid) js_GetSrcNoteOffset(sn, 0));
rval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0);
if (!rval)
return JS_FALSE;
RETRACT(&ss->sprinter, rval);
js_printf(jp, "\t%s: {\n", rval);
jp->indent += 4;
break;
case SRC_ENDBRACE:
jp->indent -= 4;
js_printf(jp, "\t}\n");
break;
case SRC_CATCH:
jp->indent -= 4;
sn = js_GetSrcNote(jp->script, pc);
pc += oplen;
js_printf(jp, "\t} catch (");
LOCAL_ASSERT(*pc == JSOP_NAME);
pc += js_CodeSpec[JSOP_NAME].length;
LOCAL_ASSERT(*pc == JSOP_PUSHOBJ);
pc += js_CodeSpec[JSOP_PUSHOBJ].length;
LOCAL_ASSERT(*pc == JSOP_NEWINIT);
pc += js_CodeSpec[JSOP_NEWINIT].length;
LOCAL_ASSERT(*pc == JSOP_EXCEPTION);
pc += js_CodeSpec[JSOP_EXCEPTION].length;
if (*pc == JSOP_LITOPX) {
atomIndex = GET_LITERAL_INDEX(pc);
pc += 1 + LITERAL_INDEX_LEN;
LOCAL_ASSERT(*pc == JSOP_INITCATCHVAR);
++pc;
} else {
LOCAL_ASSERT(*pc == JSOP_INITCATCHVAR);
atomIndex = GET_ATOM_INDEX(pc);
pc += js_CodeSpec[JSOP_INITCATCHVAR].length;
}
atom = js_GetAtom(cx, &jp->script->atomMap, atomIndex);
rval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0);
if (!rval)
return JS_FALSE;
RETRACT(&ss->sprinter, rval);
js_printf(jp, "%s", rval);
LOCAL_ASSERT(*pc == JSOP_ENTERWITH);
pc += js_CodeSpec[JSOP_ENTERWITH].length;
len = js_GetSrcNoteOffset(sn, 0);
if (len) {
js_printf(jp, " if ");
DECOMPILE_CODE(pc, len);
js_printf(jp, "%s", POP_STR());
pc += len;
LOCAL_ASSERT(*pc == JSOP_IFEQ || *pc == JSOP_IFEQX);
pc += js_CodeSpec[*pc].length;
}
js_printf(jp, ") {\n");
jp->indent += 4;
todo = Sprint(&ss->sprinter, catch_cookie);
len = 0;
break;
case SRC_FUNCDEF:
atom = js_GetAtom(cx, &jp->script->atomMap,
(jsatomid) js_GetSrcNoteOffset(sn, 0));
JS_ASSERT(ATOM_IS_OBJECT(atom));
do_function:
obj = ATOM_TO_OBJECT(atom);
fun = (JSFunction *) JS_GetPrivate(cx, obj);
jp2 = js_NewPrinter(cx, JS_GetFunctionName(fun),
jp->indent, jp->pretty);
if (!jp2)
return JS_FALSE;
jp2->scope = jp->scope;
js_puts(jp2, "\n");
ok = js_DecompileFunction(jp2, fun);
if (ok) {
js_puts(jp2, "\n");
str = js_GetPrinterOutput(jp2);
if (str)
js_printf(jp, "%s\n", JS_GetStringBytes(str));
else
ok = JS_FALSE;
}
js_DestroyPrinter(jp2);
if (!ok)
return JS_FALSE;
break;
default:;
}
case JSOP_RETRVAL:
break;
case JSOP_GROUP:
/* Use last real op so PopOff adds parens if needed. */
todo = PopOff(ss, lastop);
/* Now add user-supplied parens only if PopOff did not. */
cs = &js_CodeSpec[lastop];
topcs = &js_CodeSpec[ss->opcodes[ss->top]];
if (topcs->prec >= cs->prec) {
todo = Sprint(&ss->sprinter, "(%s)",
OFF2STR(&ss->sprinter, todo));
}
break;
case JSOP_PUSH:
case JSOP_PUSHOBJ:
case JSOP_BINDNAME:
do_JSOP_BINDNAME:
todo = Sprint(&ss->sprinter, "");
break;
#if JS_HAS_EXCEPTIONS
case JSOP_TRY:
js_printf(jp, "\ttry {\n");
jp->indent += 4;
todo = -2;
break;
{
static const char finally_cookie[] = "/*FINALLY*/";
case JSOP_FINALLY:
jp->indent -= 4;
js_printf(jp, "\t} finally {\n");
jp->indent += 4;
/*
* We must push an empty string placeholder for gosub's return
* address, popped by JSOP_RETSUB and counted by script->depth
* but not by ss->top (see JSOP_SETSP, below).
*/
todo = Sprint(&ss->sprinter, finally_cookie);
break;
case JSOP_RETSUB:
rval = POP_STR();
LOCAL_ASSERT(strcmp(rval, finally_cookie) == 0);
todo = -2;
break;
}
case JSOP_SWAP:
/*
* We don't generate this opcode currently, and previously we
* did not need to decompile it. If old, serialized bytecode
* uses it still, we should fall through and set todo = -2.
*/
/* FALL THROUGH */
case JSOP_GOSUB:
case JSOP_GOSUBX:
/*
* JSOP_GOSUB and GOSUBX have no effect on the decompiler's
* string stack because the next op in bytecode order finds
* the stack balanced by a JSOP_RETSUB executed elsewhere.
*/
todo = -2;
break;
case JSOP_SETSP:
/*
* The compiler models operand stack depth and fixes the stack
* pointer on entry to a catch clause based on its depth model.
* The decompiler must match the code generator's model, which
* is why JSOP_FINALLY pushes a cookie that JSOP_RETSUB pops.
*/
LOCAL_ASSERT(ss->top >= (uintN) GET_ATOM_INDEX(pc));
ss->top = (uintN) GET_ATOM_INDEX(pc);
break;
case JSOP_EXCEPTION:
/*
* The only other JSOP_EXCEPTION case occurs as part of a code
* sequence that follows a SRC_CATCH-annotated JSOP_NOP.
*/
sn = js_GetSrcNote(jp->script, pc);
LOCAL_ASSERT(sn && SN_TYPE(sn) == SRC_HIDDEN);
todo = -2;
break;
#endif /* JS_HAS_EXCEPTIONS */
case JSOP_POP:
case JSOP_POPV:
sn = js_GetSrcNote(jp->script, pc);
switch (sn ? SN_TYPE(sn) : SRC_NULL) {
case SRC_FOR:
rval = POP_STR();
todo = -2;
goto do_forloop;
case SRC_PCDELTA:
/* Pop and save to avoid blowing stack depth budget. */
lval = JS_strdup(cx, POP_STR());
if (!lval)
return JS_FALSE;
/*
* The offset tells distance to the end of the right-hand
* operand of the comma operator.
*/
done = pc + len;
pc += js_GetSrcNoteOffset(sn, 0);
len = 0;
if (!Decompile(ss, done, pc - done)) {
JS_free(cx, (char *)lval);
return JS_FALSE;
}
/* Pop Decompile result and print comma expression. */
rval = POP_STR();
todo = Sprint(&ss->sprinter, "%s, %s", lval, rval);
JS_free(cx, (char *)lval);
break;
case SRC_HIDDEN:
/* Hide this pop, it's from a goto in a with or for/in. */
todo = -2;
break;
default:
rval = POP_STR();
if (*rval != '\0')
js_printf(jp, "\t%s;\n", rval);
todo = -2;
break;
}
break;
case JSOP_POP2:
(void) PopOff(ss, op);
(void) PopOff(ss, op);
todo = -2;
break;
case JSOP_ENTERWITH:
JS_ASSERT(!js_GetSrcNote(jp->script, pc));
rval = POP_STR();
js_printf(jp, "\twith (%s) {\n", rval);
jp->indent += 4;
todo = Sprint(&ss->sprinter, with_cookie);
break;
case JSOP_LEAVEWITH:
sn = js_GetSrcNote(jp->script, pc);
todo = -2;
if (sn && SN_TYPE(sn) == SRC_HIDDEN)
break;
rval = POP_STR();
if (sn && SN_TYPE(sn) == SRC_CATCH) {
LOCAL_ASSERT(strcmp(rval, catch_cookie) == 0);
LOCAL_ASSERT((uintN) js_GetSrcNoteOffset(sn, 0) == ss->top);
break;
}
LOCAL_ASSERT(strcmp(rval, with_cookie) == 0);
jp->indent -= 4;
js_printf(jp, "\t}\n");
break;
case JSOP_SETRVAL:
case JSOP_RETURN:
lval = js_CodeSpec[JSOP_RETURN].name;
rval = POP_STR();
if (*rval != '\0')
js_printf(jp, "\t%s %s;\n", lval, rval);
else
js_printf(jp, "\t%s;\n", lval);
todo = -2;
break;
#if JS_HAS_EXCEPTIONS
case JSOP_THROW:
sn = js_GetSrcNote(jp->script, pc);
todo = -2;
if (sn && SN_TYPE(sn) == SRC_HIDDEN)
break;
rval = POP_STR();
js_printf(jp, "\t%s %s;\n", cs->name, rval);
break;
#endif /* JS_HAS_EXCEPTIONS */
case JSOP_GOTO:
case JSOP_GOTOX:
sn = js_GetSrcNote(jp->script, pc);
switch (sn ? SN_TYPE(sn) : SRC_NULL) {
case SRC_CONT2LABEL:
atom = js_GetAtom(cx, &jp->script->atomMap,
(jsatomid) js_GetSrcNoteOffset(sn, 0));
rval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0);
if (!rval)
return JS_FALSE;
RETRACT(&ss->sprinter, rval);
js_printf(jp, "\tcontinue %s;\n", rval);
break;
case SRC_CONTINUE:
js_printf(jp, "\tcontinue;\n");
break;
case SRC_BREAK2LABEL:
atom = js_GetAtom(cx, &jp->script->atomMap,
(jsatomid) js_GetSrcNoteOffset(sn, 0));
rval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0);
if (!rval)
return JS_FALSE;
RETRACT(&ss->sprinter, rval);
js_printf(jp, "\tbreak %s;\n", rval);
break;
case SRC_HIDDEN:
break;
default:
js_printf(jp, "\tbreak;\n");
break;
}
todo = -2;
break;
case JSOP_IFEQ:
case JSOP_IFEQX:
len = GetJumpOffset(pc, pc);
sn = js_GetSrcNote(jp->script, pc);
switch (sn ? SN_TYPE(sn) : SRC_NULL) {
case SRC_IF:
case SRC_IF_ELSE:
rval = POP_STR();
js_printf(jp, "\tif (%s) {\n", rval);
jp->indent += 4;
if (SN_TYPE(sn) == SRC_IF) {
DECOMPILE_CODE(pc + oplen, len - oplen);
} else {
len = js_GetSrcNoteOffset(sn, 0);
DECOMPILE_CODE(pc + oplen, len - oplen);
jp->indent -= 4;
pc += len;
LOCAL_ASSERT(*pc == JSOP_GOTO || *pc == JSOP_GOTOX);
oplen = js_CodeSpec[*pc].length;
len = GetJumpOffset(pc, pc);
js_printf(jp, "\t} else {\n");
jp->indent += 4;
DECOMPILE_CODE(pc + oplen, len - oplen);
}
jp->indent -= 4;
js_printf(jp, "\t}\n");
todo = -2;
break;
case SRC_WHILE:
rval = POP_STR();
js_printf(jp, "\twhile (%s) {\n", rval);
jp->indent += 4;
tail = js_GetSrcNoteOffset(sn, 0);
DECOMPILE_CODE(pc + oplen, tail - oplen);
jp->indent -= 4;
js_printf(jp, "\t}\n");
todo = -2;
break;
case SRC_COND:
xval = JS_strdup(cx, POP_STR());
if (!xval)
return JS_FALSE;
len = js_GetSrcNoteOffset(sn, 0);
DECOMPILE_CODE(pc + oplen, len - oplen);
lval = JS_strdup(cx, POP_STR());
if (!lval) {
JS_free(cx, (void *)xval);
return JS_FALSE;
}
pc += len;
LOCAL_ASSERT(*pc == JSOP_GOTO || *pc == JSOP_GOTOX);
oplen = js_CodeSpec[*pc].length;
len = GetJumpOffset(pc, pc);
DECOMPILE_CODE(pc + oplen, len - oplen);
rval = POP_STR();
todo = Sprint(&ss->sprinter, "%s ? %s : %s",
xval, lval, rval);
JS_free(cx, (void *)xval);
JS_free(cx, (void *)lval);
break;
default:
break;
}
break;
case JSOP_IFNE:
case JSOP_IFNEX:
#if JS_HAS_DO_WHILE_LOOP
/* Currently, this must be a do-while loop's upward branch. */
jp->indent -= 4;
js_printf(jp, "\t} while (%s);\n", POP_STR());
todo = -2;
#else
JS_ASSERT(0);
#endif /* JS_HAS_DO_WHILE_LOOP */
break;
case JSOP_OR:
case JSOP_ORX:
xval = "||";
do_logical_connective:
/* Top of stack is the first clause in a disjunction (||). */
lval = JS_strdup(cx, POP_STR());
if (!lval)
return JS_FALSE;
done = pc + GetJumpOffset(pc, pc);
pc += len;
len = PTRDIFF(done, pc, jsbytecode);
DECOMPILE_CODE(pc, len);
rval = POP_STR();
if (jp->pretty &&
jp->indent + 4 + strlen(lval) + 4 + strlen(rval) > 75) {
rval = JS_strdup(cx, rval);
if (!rval) {
tail = -1;
} else {
todo = Sprint(&ss->sprinter, "%s %s\n", lval, xval);
tail = Sprint(&ss->sprinter, "%*s%s",
jp->indent + 4, "", rval);
JS_free(cx, (char *)rval);
}
if (tail < 0)
todo = -1;
} else {
todo = Sprint(&ss->sprinter, "%s %s %s", lval, xval, rval);
}
JS_free(cx, (char *)lval);
break;
case JSOP_AND:
case JSOP_ANDX:
xval = "&&";
goto do_logical_connective;
case JSOP_FORARG:
atom = GetSlotAtom(jp, js_GetArgument, GET_ARGNO(pc));
LOCAL_ASSERT(atom);
goto do_fornameinloop;
case JSOP_FORVAR:
atom = GetSlotAtom(jp, js_GetLocalVariable, GET_VARNO(pc));
LOCAL_ASSERT(atom);
goto do_fornameinloop;
case JSOP_FORNAME:
atom = GET_ATOM(cx, jp->script, pc);
do_fornameinloop:
sn = js_GetSrcNote(jp->script, pc);
xval = NULL;
lval = "";
goto do_forinloop;
case JSOP_FORPROP:
xval = NULL;
atom = GET_ATOM(cx, jp->script, pc);
if (!ATOM_IS_IDENTIFIER(atom)) {
xval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom),
(jschar)'\'');
if (!xval)
return JS_FALSE;
atom = NULL;
}
lval = POP_STR();
sn = NULL;
do_forinloop:
pc += oplen;
LOCAL_ASSERT(*pc == JSOP_IFEQ || *pc == JSOP_IFEQX);
oplen = js_CodeSpec[*pc].length;
len = GetJumpOffset(pc, pc);
sn2 = js_GetSrcNote(jp->script, pc);
tail = js_GetSrcNoteOffset(sn2, 0);
do_forinbody:
#if JS_HAS_XML_SUPPORT
if (foreach) {
foreach = JS_FALSE;
js_printf(jp, "\tfor %s (%s%s",
js_each_str, VarPrefix(sn), lval);
} else
#endif
js_printf(jp, "\tfor (%s%s", VarPrefix(sn), lval);
if (atom) {
xval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0);
if (!xval)
return JS_FALSE;
RETRACT(&ss->sprinter, xval);
js_printf(jp, *lval ? ".%s" : "%s", xval);
} else if (xval && *xval) {
js_printf(jp,
(js_CodeSpec[lastop].format & JOF_XMLNAME)
? ".%s"
: "[%s]",
xval);
}
rval = OFF2STR(&ss->sprinter, ss->offsets[ss->top-1]);
js_printf(jp, " in %s) {\n", rval);
jp->indent += 4;
DECOMPILE_CODE(pc + oplen, tail - oplen);
jp->indent -= 4;
js_printf(jp, "\t}\n");
todo = -2;
break;
case JSOP_FORELEM:
pc++;
LOCAL_ASSERT(*pc == JSOP_IFEQ || *pc == JSOP_IFEQX);
len = js_CodeSpec[*pc].length;
/*
* Arrange for the JSOP_ENUMELEM case to set tail for use by
* do_forinbody: code that uses on it to find the loop-closing
* jump (whatever its format, normal or extended), in order to
* bound the recursively decompiled loop body.
*/
sn = js_GetSrcNote(jp->script, pc);
JS_ASSERT(!forelem_tail);
forelem_tail = pc + js_GetSrcNoteOffset(sn, 0);
/*
* This gets a little wacky. Only the length of the for loop
* body PLUS the element-indexing expression is known here, so
* we pass the after-loop pc to the JSOP_ENUMELEM case, which
* is immediately below, to decompile that helper bytecode via
* the 'forelem_done' local.
*
* Since a for..in loop can't nest in the head of another for
* loop, we can use forelem_{tail,done} singletons to remember
* state from JSOP_FORELEM to JSOP_ENUMELEM, thence (via goto)
* to label do_forinbody.
*/
JS_ASSERT(!forelem_done);
forelem_done = pc + GetJumpOffset(pc, pc);
break;
case JSOP_ENUMELEM:
/*
* The stack has the object under the (top) index expression.
* The "rval" property id is underneath those two on the stack.
* The for loop body net and gross lengths can now be adjusted
* to account for the length of the indexing expression that
* came after JSOP_FORELEM and before JSOP_ENUMELEM.
*/
atom = NULL;
xval = POP_STR();
lval = POP_STR();
rval = OFF2STR(&ss->sprinter, ss->offsets[ss->top-1]);
JS_ASSERT(forelem_tail > pc);
tail = forelem_tail - pc;
forelem_tail = NULL;
JS_ASSERT(forelem_done > pc);
len = forelem_done - pc;
forelem_done = NULL;
goto do_forinbody;
#if JS_HAS_GETTER_SETTER
case JSOP_GETTER:
case JSOP_SETTER:
todo = -2;
break;
#endif
case JSOP_DUP2:
rval = OFF2STR(&ss->sprinter, ss->offsets[ss->top-2]);
todo = SprintPut(&ss->sprinter, rval, strlen(rval));
if (todo < 0 || !PushOff(ss, todo, ss->opcodes[ss->top-2]))
return JS_FALSE;
/* FALL THROUGH */
case JSOP_DUP:
rval = OFF2STR(&ss->sprinter, ss->offsets[ss->top-1]);
op = ss->opcodes[ss->top-1];
todo = SprintPut(&ss->sprinter, rval, strlen(rval));
break;
case JSOP_SETARG:
atom = GetSlotAtom(jp, js_GetArgument, GET_ARGNO(pc));
LOCAL_ASSERT(atom);
goto do_setname;
case JSOP_SETVAR:
atom = GetSlotAtom(jp, js_GetLocalVariable, GET_VARNO(pc));
LOCAL_ASSERT(atom);
goto do_setname;
case JSOP_SETCONST:
case JSOP_SETNAME:
case JSOP_SETGVAR:
atomIndex = GET_ATOM_INDEX(pc);
do_JSOP_SETCONST:
atom = js_GetAtom(cx, &jp->script->atomMap, atomIndex);
do_setname:
lval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0);
if (!lval)
return JS_FALSE;
rval = POP_STR();
if (op == JSOP_SETNAME)
(void) PopOff(ss, op);
do_setlval:
sn = js_GetSrcNote(jp->script, pc - 1);
if (sn && SN_TYPE(sn) == SRC_ASSIGNOP) {
todo = Sprint(&ss->sprinter, "%s %s= %s",
lval, js_CodeSpec[lastop].token, rval);
} else {
sn = js_GetSrcNote(jp->script, pc);
todo = Sprint(&ss->sprinter, "%s%s = %s",
VarPrefix(sn), lval, rval);
}
break;
case JSOP_NEW:
case JSOP_CALL:
case JSOP_EVAL:
#if JS_HAS_LVALUE_RETURN
case JSOP_SETCALL:
#endif
saveop = op;
op = JSOP_NOP; /* turn off parens */
argc = GET_ARGC(pc);
argv = (char **)
JS_malloc(cx, (size_t)(argc + 1) * sizeof *argv);
if (!argv)
return JS_FALSE;
ok = JS_TRUE;
for (i = argc; i > 0; i--) {
argv[i] = JS_strdup(cx, POP_STR());
if (!argv[i]) {
ok = JS_FALSE;
break;
}
}
/* Skip the JSOP_PUSHOBJ-created empty string. */
LOCAL_ASSERT(ss->top >= 2);
(void) PopOff(ss, op);
/* Get the callee's decompiled image in argv[0]. */
argv[0] = JS_strdup(cx, POP_STR());
if (!argv[i])
ok = JS_FALSE;
lval = "(", rval = ")";
if (saveop == JSOP_NEW) {
todo = Sprint(&ss->sprinter, "%s %s%s",
js_new_str, argv[0], lval);
} else {
todo = Sprint(&ss->sprinter, "%s%s",
argv[0], lval);
}
if (todo < 0)
ok = JS_FALSE;
for (i = 1; i <= argc; i++) {
if (!argv[i] ||
Sprint(&ss->sprinter, "%s%s",
argv[i], (i < argc) ? ", " : "") < 0) {
ok = JS_FALSE;
break;
}
}
if (Sprint(&ss->sprinter, rval) < 0)
ok = JS_FALSE;
for (i = 0; i <= argc; i++) {
if (argv[i])
JS_free(cx, argv[i]);
}
JS_free(cx, argv);
if (!ok)
return JS_FALSE;
op = saveop;
#if JS_HAS_LVALUE_RETURN
if (op == JSOP_SETCALL) {
if (!PushOff(ss, todo, op))
return JS_FALSE;
todo = Sprint(&ss->sprinter, "");
}
#endif
break;
case JSOP_DELNAME:
atom = GET_ATOM(cx, jp->script, pc);
lval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0);
if (!lval)
return JS_FALSE;
RETRACT(&ss->sprinter, lval);
todo = Sprint(&ss->sprinter, "%s %s", js_delete_str, lval);
break;
case JSOP_DELPROP:
GET_ATOM_QUOTE_AND_FMT("%s %s[%s]", "%s %s.%s", rval);
lval = POP_STR();
todo = Sprint(&ss->sprinter, fmt, js_delete_str, lval, rval);
break;
case JSOP_DELELEM:
xval = POP_STR();
lval = POP_STR();
todo = Sprint(&ss->sprinter,
(js_CodeSpec[lastop].format & JOF_XMLNAME)
? "%s %s.%s"
: "%s %s[%s]",
js_delete_str, lval, xval);
break;
#if JS_HAS_XML_SUPPORT
case JSOP_DELDESC:
xval = POP_STR();
lval = POP_STR();
todo = Sprint(&ss->sprinter, "%s %s..%s",
js_delete_str, lval, xval);
break;
#endif
case JSOP_TYPEOF:
case JSOP_VOID:
rval = POP_STR();
todo = Sprint(&ss->sprinter, "%s %s", cs->name, rval);
break;
case JSOP_INCARG:
case JSOP_DECARG:
atom = GetSlotAtom(jp, js_GetArgument, GET_ARGNO(pc));
LOCAL_ASSERT(atom);
goto do_incatom;
case JSOP_INCVAR:
case JSOP_DECVAR:
atom = GetSlotAtom(jp, js_GetLocalVariable, GET_VARNO(pc));
LOCAL_ASSERT(atom);
goto do_incatom;
case JSOP_INCNAME:
case JSOP_DECNAME:
case JSOP_INCGVAR:
case JSOP_DECGVAR:
atom = GET_ATOM(cx, jp->script, pc);
do_incatom:
lval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0);
if (!lval)
return JS_FALSE;
RETRACT(&ss->sprinter, lval);
todo = Sprint(&ss->sprinter, "%s%s",
js_incop_str[!(cs->format & JOF_INC)], lval);
break;
case JSOP_INCPROP:
case JSOP_DECPROP:
GET_ATOM_QUOTE_AND_FMT("%s%s[%s]", "%s%s.%s", rval);
lval = POP_STR();
todo = Sprint(&ss->sprinter, fmt,
js_incop_str[!(cs->format & JOF_INC)],
lval, rval);
break;
case JSOP_INCELEM:
case JSOP_DECELEM:
xval = POP_STR();
lval = POP_STR();
if (*xval != '\0') {
todo = Sprint(&ss->sprinter,
(js_CodeSpec[lastop].format & JOF_XMLNAME)
? "%s%s.%s"
: "%s%s[%s]",
js_incop_str[!(cs->format & JOF_INC)],
lval, xval);
} else {
todo = Sprint(&ss->sprinter, "%s%s",
js_incop_str[!(cs->format & JOF_INC)], lval);
}
break;
case JSOP_ARGINC:
case JSOP_ARGDEC:
atom = GetSlotAtom(jp, js_GetArgument, GET_ARGNO(pc));
LOCAL_ASSERT(atom);
goto do_atominc;
case JSOP_VARINC:
case JSOP_VARDEC:
atom = GetSlotAtom(jp, js_GetLocalVariable, GET_VARNO(pc));
LOCAL_ASSERT(atom);
goto do_atominc;
case JSOP_NAMEINC:
case JSOP_NAMEDEC:
case JSOP_GVARINC:
case JSOP_GVARDEC:
atom = GET_ATOM(cx, jp->script, pc);
do_atominc:
lval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0);
if (!lval)
return JS_FALSE;
todo = STR2OFF(&ss->sprinter, lval);
SprintPut(&ss->sprinter,
js_incop_str[!(cs->format & JOF_INC)],
2);
break;
case JSOP_PROPINC:
case JSOP_PROPDEC:
GET_ATOM_QUOTE_AND_FMT("%s[%s]%s", "%s.%s%s", rval);
lval = POP_STR();
todo = Sprint(&ss->sprinter, fmt, lval, rval,
js_incop_str[!(cs->format & JOF_INC)]);
break;
case JSOP_ELEMINC:
case JSOP_ELEMDEC:
xval = POP_STR();
lval = POP_STR();
if (*xval != '\0') {
todo = Sprint(&ss->sprinter,
(js_CodeSpec[lastop].format & JOF_XMLNAME)
? "%s.%s%s"
: "%s[%s]%s",
lval, xval,
js_incop_str[!(cs->format & JOF_INC)]);
} else {
todo = Sprint(&ss->sprinter, "%s%s",
lval, js_incop_str[!(cs->format & JOF_INC)]);
}
break;
case JSOP_GETPROP2:
op = JSOP_GETPROP;
(void) PopOff(ss, lastop);
/* FALL THROUGH */
case JSOP_GETPROP:
atom = GET_ATOM(cx, jp->script, pc);
do_getprop:
GET_QUOTE_AND_FMT("%s[%s]", "%s.%s", rval);
do_getprop_lval:
lval = POP_STR();
todo = Sprint(&ss->sprinter, fmt, lval, rval);
break;
#if JS_HAS_XML_SUPPORT
BEGIN_LITOPX_CASE(JSOP_GETMETHOD)
sn = js_GetSrcNote(jp->script, pc);
if (sn && SN_TYPE(sn) == SRC_PCBASE)
goto do_getprop;
GET_QUOTE_AND_FMT("%s.function::[%s]", "%s.function::%s", rval);
goto do_getprop_lval;
BEGIN_LITOPX_CASE(JSOP_SETMETHOD)
sn = js_GetSrcNote(jp->script, pc);
if (sn && SN_TYPE(sn) == SRC_PCBASE)
goto do_setprop;
GET_QUOTE_AND_FMT("%s.function::[%s] %s= %s",
"%s.function::%s %s= %s",
xval);
goto do_setprop_rval;
#endif
case JSOP_SETPROP:
atom = GET_ATOM(cx, jp->script, pc);
do_setprop:
GET_QUOTE_AND_FMT("%s[%s] %s= %s", "%s.%s %s= %s", xval);
do_setprop_rval:
rval = POP_STR();
lval = POP_STR();
sn = js_GetSrcNote(jp->script, pc - 1);
todo = Sprint(&ss->sprinter, fmt, lval, xval,
(sn && SN_TYPE(sn) == SRC_ASSIGNOP)
? js_CodeSpec[lastop].token
: "",
rval);
break;
case JSOP_GETELEM2:
op = JSOP_GETELEM;
(void) PopOff(ss, lastop);
/* FALL THROUGH */
case JSOP_GETELEM:
op = JSOP_NOP; /* turn off parens */
xval = POP_STR();
op = JSOP_GETELEM;
lval = POP_STR();
if (*xval == '\0') {
todo = Sprint(&ss->sprinter, "%s", lval);
} else {
todo = Sprint(&ss->sprinter,
(js_CodeSpec[lastop].format & JOF_XMLNAME)
? "%s.%s"
: "%s[%s]",
lval, xval);
}
break;
case JSOP_SETELEM:
op = JSOP_NOP; /* turn off parens */
rval = POP_STR();
xval = POP_STR();
op = JSOP_SETELEM;
lval = POP_STR();
if (*xval == '\0')
goto do_setlval;
sn = js_GetSrcNote(jp->script, pc - 1);
todo = Sprint(&ss->sprinter,
(js_CodeSpec[lastop].format & JOF_XMLNAME)
? "%s.%s %s= %s"
: "%s[%s] %s= %s",
lval, xval,
(sn && SN_TYPE(sn) == SRC_ASSIGNOP)
? js_CodeSpec[lastop].token
: "",
rval);
break;
case JSOP_ARGSUB:
i = (jsint) GET_ATOM_INDEX(pc);
todo = Sprint(&ss->sprinter, "%s[%d]",
js_arguments_str, (int) i);
break;
case JSOP_ARGCNT:
todo = Sprint(&ss->sprinter, "%s.%s",
js_arguments_str, js_length_str);
break;
case JSOP_GETARG:
atom = GetSlotAtom(jp, js_GetArgument, GET_ARGNO(pc));
LOCAL_ASSERT(atom);
goto do_name;
case JSOP_GETVAR:
atom = GetSlotAtom(jp, js_GetLocalVariable, GET_VARNO(pc));
LOCAL_ASSERT(atom);
goto do_name;
case JSOP_NAME:
case JSOP_GETGVAR:
atom = GET_ATOM(cx, jp->script, pc);
do_name:
sn = js_GetSrcNote(jp->script, pc);
rval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0);
if (!rval)
return JS_FALSE;
RETRACT(&ss->sprinter, rval);
todo = Sprint(&ss->sprinter, "%s%s", VarPrefix(sn), rval);
break;
case JSOP_UINT16:
i = (jsint) GET_ATOM_INDEX(pc);
goto do_sprint_int;
case JSOP_UINT24:
i = (jsint) GET_LITERAL_INDEX(pc);
do_sprint_int:
todo = Sprint(&ss->sprinter, "%u", (unsigned) i);
break;
case JSOP_LITERAL:
atomIndex = GET_LITERAL_INDEX(pc);
goto do_JSOP_STRING;
case JSOP_FINDNAME:
atomIndex = GET_LITERAL_INDEX(pc);
todo = Sprint(&ss->sprinter, "");
if (todo < 0 || !PushOff(ss, todo, op))
return JS_FALSE;
atom = js_GetAtom(cx, &jp->script->atomMap, atomIndex);
goto do_name;
case JSOP_LITOPX:
atomIndex = GET_LITERAL_INDEX(pc);
op = pc[1 + LITERAL_INDEX_LEN];
switch (op) {
case JSOP_ANONFUNOBJ: goto do_JSOP_ANONFUNOBJ;
case JSOP_BINDNAME: goto do_JSOP_BINDNAME;
case JSOP_CLOSURE: goto do_JSOP_CLOSURE;
#if JS_HAS_EXPORT_IMPORT
case JSOP_EXPORTNAME: goto do_JSOP_EXPORTNAME;
#endif
#if JS_HAS_XML_SUPPORT
case JSOP_GETMETHOD: goto do_JSOP_GETMETHOD;
case JSOP_SETMETHOD: goto do_JSOP_SETMETHOD;
#endif
case JSOP_NAMEDFUNOBJ: goto do_JSOP_NAMEDFUNOBJ;
case JSOP_NUMBER: goto do_JSOP_NUMBER;
case JSOP_OBJECT: goto do_JSOP_OBJECT;
#if JS_HAS_XML_SUPPORT
case JSOP_QNAMECONST: goto do_JSOP_QNAMECONST;
case JSOP_QNAMEPART: goto do_JSOP_QNAMEPART;
#endif
case JSOP_REGEXP: goto do_JSOP_REGEXP;
case JSOP_SETCONST: goto do_JSOP_SETCONST;
case JSOP_STRING: goto do_JSOP_STRING;
#if JS_HAS_XML_SUPPORT
case JSOP_XMLCDATA: goto do_JSOP_XMLCDATA;
case JSOP_XMLCOMMENT: goto do_JSOP_XMLCOMMENT;
case JSOP_XMLOBJECT: goto do_JSOP_XMLOBJECT;
case JSOP_XMLPI: goto do_JSOP_XMLPI;
#endif
default: JS_ASSERT(0);
}
/* NOTREACHED */
break;
BEGIN_LITOPX_CASE(JSOP_NUMBER)
val = ATOM_KEY(atom);
if (JSVAL_IS_INT(val)) {
long ival = (long)JSVAL_TO_INT(val);
todo = Sprint(&ss->sprinter, "%ld", ival);
} else {
char buf[DTOSTR_STANDARD_BUFFER_SIZE];
char *numStr = JS_dtostr(buf, sizeof buf, DTOSTR_STANDARD,
0, *JSVAL_TO_DOUBLE(val));
if (!numStr) {
JS_ReportOutOfMemory(cx);
return JS_FALSE;
}
todo = Sprint(&ss->sprinter, numStr);
}
END_LITOPX_CASE
BEGIN_LITOPX_CASE(JSOP_STRING)
rval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom),
inXML ? 0 : (jschar)'"');
if (!rval)
return JS_FALSE;
todo = STR2OFF(&ss->sprinter, rval);
END_LITOPX_CASE
case JSOP_OBJECT:
case JSOP_REGEXP:
case JSOP_ANONFUNOBJ:
case JSOP_NAMEDFUNOBJ:
atomIndex = GET_ATOM_INDEX(pc);
do_JSOP_OBJECT:
do_JSOP_REGEXP:
do_JSOP_ANONFUNOBJ:
do_JSOP_NAMEDFUNOBJ:
atom = js_GetAtom(cx, &jp->script->atomMap, atomIndex);
if (op == JSOP_OBJECT || op == JSOP_REGEXP) {
if (!js_regexp_toString(cx, ATOM_TO_OBJECT(atom), 0, NULL,
&val)) {
return JS_FALSE;
}
} else {
if (!js_fun_toString(cx, ATOM_TO_OBJECT(atom),
(pc + len < endpc &&
pc[len] == JSOP_GROUP)
? JS_IN_GROUP_CONTEXT |
JS_DONT_PRETTY_PRINT
: JS_DONT_PRETTY_PRINT,
0, NULL, &val)) {
return JS_FALSE;
}
}
str = JSVAL_TO_STRING(val);
todo = SprintPut(&ss->sprinter, JS_GetStringBytes(str),
JSSTRING_LENGTH(str));
break;
#if JS_HAS_SWITCH_STATEMENT
case JSOP_TABLESWITCH:
case JSOP_TABLESWITCHX:
{
jsbytecode *pc2;
ptrdiff_t jmplen, off, off2;
jsint j, n, low, high;
TableEntry *table, pivot;
sn = js_GetSrcNote(jp->script, pc);
JS_ASSERT(sn && SN_TYPE(sn) == SRC_SWITCH);
len = js_GetSrcNoteOffset(sn, 0);
jmplen = (op == JSOP_TABLESWITCH) ? JUMP_OFFSET_LEN
: JUMPX_OFFSET_LEN;
pc2 = pc;
off = GetJumpOffset(pc, pc2);
pc2 += jmplen;
low = GET_JUMP_OFFSET(pc2);
pc2 += JUMP_OFFSET_LEN;
high = GET_JUMP_OFFSET(pc2);
pc2 += JUMP_OFFSET_LEN;
n = high - low + 1;
if (n == 0) {
table = NULL;
j = 0;
} else {
table = (TableEntry *)
JS_malloc(cx, (size_t)n * sizeof *table);
if (!table)
return JS_FALSE;
for (i = j = 0; i < n; i++) {
table[j].label = NULL;
off2 = GetJumpOffset(pc, pc2);
if (off2) {
sn = js_GetSrcNote(jp->script, pc2);
if (sn) {
JS_ASSERT(SN_TYPE(sn) == SRC_LABEL);
table[j].label =
js_GetAtom(cx, &jp->script->atomMap,
(jsatomid)
js_GetSrcNoteOffset(sn, 0));
}
table[j].key = INT_TO_JSVAL(low + i);
table[j].offset = off2;
table[j].order = j;
j++;
}
pc2 += jmplen;
}
js_HeapSort(table, (size_t) j, &pivot, sizeof(TableEntry),
CompareOffsets, NULL);
}
ok = DecompileSwitch(ss, table, (uintN)j, pc, len, off,
JS_FALSE);
JS_free(cx, table);
if (!ok)
return ok;
todo = -2;
break;
}
case JSOP_LOOKUPSWITCH:
case JSOP_LOOKUPSWITCHX:
{
jsbytecode *pc2;
ptrdiff_t jmplen, off, off2;
jsatomid npairs, k;
TableEntry *table;
sn = js_GetSrcNote(jp->script, pc);
JS_ASSERT(sn && SN_TYPE(sn) == SRC_SWITCH);
len = js_GetSrcNoteOffset(sn, 0);
jmplen = (op == JSOP_LOOKUPSWITCH) ? JUMP_OFFSET_LEN
: JUMPX_OFFSET_LEN;
pc2 = pc;
off = GetJumpOffset(pc, pc2);
pc2 += jmplen;
npairs = GET_ATOM_INDEX(pc2);
pc2 += ATOM_INDEX_LEN;
table = (TableEntry *)
JS_malloc(cx, (size_t)npairs * sizeof *table);
if (!table)
return JS_FALSE;
for (k = 0; k < npairs; k++) {
sn = js_GetSrcNote(jp->script, pc2);
if (sn) {
JS_ASSERT(SN_TYPE(sn) == SRC_LABEL);
table[k].label =
js_GetAtom(cx, &jp->script->atomMap, (jsatomid)
js_GetSrcNoteOffset(sn, 0));
} else {
table[k].label = NULL;
}
atom = GET_ATOM(cx, jp->script, pc2);
pc2 += ATOM_INDEX_LEN;
off2 = GetJumpOffset(pc, pc2);
pc2 += jmplen;
table[k].key = ATOM_KEY(atom);
table[k].offset = off2;
}
ok = DecompileSwitch(ss, table, (uintN)npairs, pc, len, off,
JS_FALSE);
JS_free(cx, table);
if (!ok)
return ok;
todo = -2;
break;
}
case JSOP_CONDSWITCH:
{
jsbytecode *pc2;
ptrdiff_t off, off2, caseOff;
jsint ncases;
TableEntry *table;
sn = js_GetSrcNote(jp->script, pc);
JS_ASSERT(sn && SN_TYPE(sn) == SRC_SWITCH);
len = js_GetSrcNoteOffset(sn, 0);
off = js_GetSrcNoteOffset(sn, 1);
/*
* Count the cases using offsets from switch to first case,
* and case to case, stored in srcnote immediates.
*/
pc2 = pc;
off2 = off;
for (ncases = 0; off2 != 0; ncases++) {
pc2 += off2;
JS_ASSERT(*pc2 == JSOP_CASE || *pc2 == JSOP_DEFAULT ||
*pc2 == JSOP_CASEX || *pc2 == JSOP_DEFAULTX);
if (*pc2 == JSOP_DEFAULT || *pc2 == JSOP_DEFAULTX) {
/* End of cases, but count default as a case. */
off2 = 0;
} else {
sn = js_GetSrcNote(jp->script, pc2);
JS_ASSERT(sn && SN_TYPE(sn) == SRC_PCDELTA);
off2 = js_GetSrcNoteOffset(sn, 0);
}
}
/*
* Allocate table and rescan the cases using their srcnotes,
* stashing each case's delta from switch top in table[i].key,
* and the distance to its statements in table[i].offset.
*/
table = (TableEntry *)
JS_malloc(cx, (size_t)ncases * sizeof *table);
if (!table)
return JS_FALSE;
pc2 = pc;
off2 = off;
for (i = 0; i < ncases; i++) {
pc2 += off2;
JS_ASSERT(*pc2 == JSOP_CASE || *pc2 == JSOP_DEFAULT ||
*pc2 == JSOP_CASEX || *pc2 == JSOP_DEFAULTX);
caseOff = pc2 - pc;
table[i].key = INT_TO_JSVAL((jsint) caseOff);
table[i].offset = caseOff + GetJumpOffset(pc2, pc2);
if (*pc2 == JSOP_CASE || *pc2 == JSOP_CASEX) {
sn = js_GetSrcNote(jp->script, pc2);
JS_ASSERT(sn && SN_TYPE(sn) == SRC_PCDELTA);
off2 = js_GetSrcNoteOffset(sn, 0);
}
}
/*
* Find offset of default code by fetching the default offset
* from the end of table. JSOP_CONDSWITCH always has a default
* case at the end.
*/
off = JSVAL_TO_INT(table[ncases-1].key);
pc2 = pc + off;
off += GetJumpOffset(pc2, pc2);
ok = DecompileSwitch(ss, table, (uintN)ncases, pc, len, off,
JS_TRUE);
JS_free(cx, table);
if (!ok)
return ok;
todo = -2;
break;
}
case JSOP_CASE:
case JSOP_CASEX:
{
lval = POP_STR();
if (!lval)
return JS_FALSE;
js_printf(jp, "\tcase %s:\n", lval);
todo = -2;
break;
}
#endif /* JS_HAS_SWITCH_STATEMENT */
#if !JS_BUG_FALLIBLE_EQOPS
case JSOP_NEW_EQ:
case JSOP_NEW_NE:
rval = POP_STR();
lval = POP_STR();
todo = Sprint(&ss->sprinter, "%s %c%s %s",
lval,
(op == JSOP_NEW_EQ) ? '=' : '!',
#if JS_HAS_TRIPLE_EQOPS
JS_VERSION_IS_ECMA(cx) ? "==" :
#endif
"=",
rval);
break;
#endif
#if JS_HAS_LEXICAL_CLOSURE
BEGIN_LITOPX_CASE(JSOP_CLOSURE)
JS_ASSERT(ATOM_IS_OBJECT(atom));
todo = -2;
goto do_function;
END_LITOPX_CASE
#endif
#if JS_HAS_EXPORT_IMPORT
case JSOP_EXPORTALL:
js_printf(jp, "\texport *\n");
todo = -2;
break;
BEGIN_LITOPX_CASE(JSOP_EXPORTNAME)
rval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0);
if (!rval)
return JS_FALSE;
RETRACT(&ss->sprinter, rval);
js_printf(jp, "\texport %s\n", rval);
todo = -2;
END_LITOPX_CASE
case JSOP_IMPORTALL:
lval = POP_STR();
js_printf(jp, "\timport %s.*\n", lval);
todo = -2;
break;
case JSOP_IMPORTPROP:
do_importprop:
GET_ATOM_QUOTE_AND_FMT("\timport %s[%s]\n", "\timport %s.%s\n",
rval);
lval = POP_STR();
js_printf(jp, fmt, lval, rval);
todo = -2;
break;
case JSOP_IMPORTELEM:
xval = POP_STR();
op = JSOP_GETELEM;
if (js_CodeSpec[lastop].format & JOF_XMLNAME)
goto do_importprop;
lval = POP_STR();
js_printf(jp, "\timport %s[%s]\n", lval, xval);
todo = -2;
break;
#endif /* JS_HAS_EXPORT_IMPORT */
case JSOP_TRAP:
op = JS_GetTrapOpcode(cx, jp->script, pc);
if (op == JSOP_LIMIT)
return JS_FALSE;
*pc = op;
cs = &js_CodeSpec[op];
len = cs->length;
DECOMPILE_CODE(pc, len);
*pc = JSOP_TRAP;
todo = -2;
break;
#if JS_HAS_INITIALIZERS
case JSOP_NEWINIT:
LOCAL_ASSERT(ss->top >= 2);
(void) PopOff(ss, op);
lval = POP_STR();
#if JS_HAS_SHARP_VARS
op = (JSOp)pc[len];
if (op == JSOP_DEFSHARP) {
pc += len;
cs = &js_CodeSpec[op];
len = cs->length;
i = (jsint) GET_ATOM_INDEX(pc);
todo = Sprint(&ss->sprinter, "#%u=%c",
(unsigned) i,
(*lval == 'O') ? '{' : '[');
} else
#endif /* JS_HAS_SHARP_VARS */
{
todo = Sprint(&ss->sprinter, (*lval == 'O') ? "{" : "[");
}
break;
case JSOP_ENDINIT:
rval = POP_STR();
sn = js_GetSrcNote(jp->script, pc);
todo = Sprint(&ss->sprinter, "%s%s%c",
rval,
(sn && SN_TYPE(sn) == SRC_CONTINUE) ? ", " : "",
(*rval == '{') ? '}' : ']');
break;
case JSOP_INITPROP:
atom = GET_ATOM(cx, jp->script, pc);
xval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom),
(jschar)
(ATOM_IS_IDENTIFIER(atom) ? 0 : '\''));
if (!xval)
return JS_FALSE;
rval = POP_STR();
lval = POP_STR();
do_initprop:
#ifdef OLD_GETTER_SETTER
todo = Sprint(&ss->sprinter, "%s%s%s%s%s:%s",
lval,
(lval[1] != '\0') ? ", " : "",
xval,
(lastop == JSOP_GETTER || lastop == JSOP_SETTER)
? " " : "",
(lastop == JSOP_GETTER) ? js_getter_str :
(lastop == JSOP_SETTER) ? js_setter_str :
"",
rval);
#else
if (lastop == JSOP_GETTER || lastop == JSOP_SETTER) {
rval += strlen(js_function_str) + 1;
todo = Sprint(&ss->sprinter, "%s%s%s %s%.*s",
lval,
(lval[1] != '\0') ? ", " : "",
(lastop == JSOP_GETTER)
? js_get_str : js_set_str,
xval,
strlen(rval) - 1,
rval);
} else {
todo = Sprint(&ss->sprinter, "%s%s%s:%s",
lval,
(lval[1] != '\0') ? ", " : "",
xval,
rval);
}
#endif
break;
case JSOP_INITELEM:
rval = POP_STR();
xval = POP_STR();
lval = POP_STR();
sn = js_GetSrcNote(jp->script, pc);
if (sn && SN_TYPE(sn) == SRC_LABEL)
goto do_initprop;
todo = Sprint(&ss->sprinter, "%s%s%s",
lval,
(lval[1] != '\0' || *xval != '0') ? ", " : "",
rval);
break;
#if JS_HAS_SHARP_VARS
case JSOP_DEFSHARP:
i = (jsint) GET_ATOM_INDEX(pc);
rval = POP_STR();
todo = Sprint(&ss->sprinter, "#%u=%s", (unsigned) i, rval);
break;
case JSOP_USESHARP:
i = (jsint) GET_ATOM_INDEX(pc);
todo = Sprint(&ss->sprinter, "#%u#", (unsigned) i);
break;
#endif /* JS_HAS_SHARP_VARS */
#endif /* JS_HAS_INITIALIZERS */
#if JS_HAS_DEBUGGER_KEYWORD
case JSOP_DEBUGGER:
js_printf(jp, "\tdebugger;\n");
todo = -2;
break;
#endif /* JS_HAS_DEBUGGER_KEYWORD */
#if JS_HAS_XML_SUPPORT
case JSOP_STARTXML:
case JSOP_STARTXMLEXPR:
inXML = op == JSOP_STARTXML;
todo = -2;
break;
case JSOP_DEFXMLNS:
rval = POP_STR();
js_printf(jp, "\t%s %s %s %s;\n",
js_default_str, js_xml_str, js_namespace_str, rval);
todo = -2;
break;
case JSOP_ANYNAME:
todo = SprintPut(&ss->sprinter, "*", 1);
break;
BEGIN_LITOPX_CASE(JSOP_QNAMEPART)
goto do_name;
END_LITOPX_CASE
BEGIN_LITOPX_CASE(JSOP_QNAMECONST)
rval = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0);
if (!rval)
return JS_FALSE;
RETRACT(&ss->sprinter, rval);
lval = POP_STR();
todo = Sprint(&ss->sprinter, "%s::%s", lval, rval);
END_LITOPX_CASE
case JSOP_QNAME:
rval = POP_STR();
lval = POP_STR();
todo = Sprint(&ss->sprinter, "%s::[%s]", lval, rval);
break;
case JSOP_TOATTRNAME:
rval = POP_STR();
todo = Sprint(&ss->sprinter, "@%s", rval);
break;
case JSOP_TOATTRVAL:
todo = -2;
break;
case JSOP_ADDATTRNAME:
rval = POP_STR();
lval = POP_STR();
todo = Sprint(&ss->sprinter, "%s %s", lval, rval);
/* This gets reset by all XML tag expressions. */
quoteAttr = JS_TRUE;
break;
case JSOP_ADDATTRVAL:
rval = POP_STR();
lval = POP_STR();
if (quoteAttr)
todo = Sprint(&ss->sprinter, "%s=\"%s\"", lval, rval);
else
todo = Sprint(&ss->sprinter, "%s=%s", lval, rval);
break;
case JSOP_BINDXMLNAME:
/* Leave the name stacked and push a dummy string. */
todo = Sprint(&ss->sprinter, "");
break;
case JSOP_SETXMLNAME:
/* Pop the r.h.s., the dummy string, and the name. */
rval = POP_STR();
(void) PopOff(ss, op);
lval = POP_STR();
goto do_setlval;
case JSOP_XMLELTEXPR:
case JSOP_XMLTAGEXPR:
todo = Sprint(&ss->sprinter, "{%s}", POP_STR());
inXML = JS_TRUE;
/* If we're an attribute value, we shouldn't quote this. */
quoteAttr = JS_FALSE;
break;
case JSOP_TOXMLLIST:
todo = Sprint(&ss->sprinter, "<>%s</>", POP_STR());
inXML = JS_FALSE;
break;
case JSOP_FOREACH:
foreach = JS_TRUE;
todo = -2;
break;
case JSOP_TOXML:
inXML = JS_FALSE;
/* FALL THROUGH */
case JSOP_XMLNAME:
case JSOP_FILTER:
/* Conversion and prefix ops do nothing in the decompiler. */
todo = -2;
break;
case JSOP_ENDFILTER:
rval = POP_STR();
lval = POP_STR();
todo = Sprint(&ss->sprinter, "%s.(%s)", lval, rval);
break;
case JSOP_DESCENDANTS:
rval = POP_STR();
lval = POP_STR();
todo = Sprint(&ss->sprinter, "%s..%s", lval, rval);
break;
BEGIN_LITOPX_CASE(JSOP_XMLOBJECT)
atom = GET_ATOM(cx, jp->script, pc);
todo = Sprint(&ss->sprinter, "<xml address='%p'>",
ATOM_TO_OBJECT(atom));
END_LITOPX_CASE
BEGIN_LITOPX_CASE(JSOP_XMLCDATA)
todo = SprintPut(&ss->sprinter, "<![CDATA[", 9);
if (!QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0))
return JS_FALSE;
SprintPut(&ss->sprinter, "]]>", 3);
END_LITOPX_CASE
BEGIN_LITOPX_CASE(JSOP_XMLCOMMENT)
todo = SprintPut(&ss->sprinter, "<!--", 4);
if (!QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0))
return JS_FALSE;
SprintPut(&ss->sprinter, "-->", 3);
END_LITOPX_CASE
BEGIN_LITOPX_CASE(JSOP_XMLPI)
rval = JS_strdup(cx, POP_STR());
if (!rval)
return JS_FALSE;
todo = SprintPut(&ss->sprinter, "<?", 2);
ok = QuoteString(&ss->sprinter, ATOM_TO_STRING(atom), 0) &&
SprintPut(&ss->sprinter, " ", 1) >= 0 &&
SprintPut(&ss->sprinter, rval, strlen(rval));
JS_free(cx, (char *)rval);
if (!ok)
return JS_FALSE;
SprintPut(&ss->sprinter, "?>", 2);
END_LITOPX_CASE
case JSOP_GETFUNNS:
todo = SprintPut(&ss->sprinter, js_function_str, 8);
break;
#endif /* JS_HAS_XML_SUPPORT */
default:
todo = -2;
break;
#undef BEGIN_LITOPX_CASE
#undef END_LITOPX_CASE
}
}
if (todo < 0) {
/* -2 means "don't push", -1 means reported error. */
if (todo == -1)
return JS_FALSE;
} else {
if (!PushOff(ss, todo, op))
return JS_FALSE;
}
pc += len;
}
/*
* Undefine local macros.
*/
#undef inXML
#undef DECOMPILE_CODE
#undef POP_STR
#undef LOCAL_ASSERT
#undef ATOM_IS_IDENTIFIER
#undef GET_QUOTE_AND_FMT
#undef GET_ATOM_QUOTE_AND_FMT
return JS_TRUE;
}
JSBool
js_DecompileCode(JSPrinter *jp, JSScript *script, jsbytecode *pc, uintN len)
{
SprintStack ss;
JSContext *cx;
void *mark, *space;
size_t offsetsz, opcodesz;
JSBool ok;
JSScript *oldscript;
char *last;
/* Initialize a sprinter for use with the offset stack. */
ss.printer = jp;
cx = jp->sprinter.context;
mark = JS_ARENA_MARK(&cx->tempPool);
INIT_SPRINTER(cx, &ss.sprinter, &cx->tempPool, PAREN_SLOP);
/* Allocate the parallel (to avoid padding) offset and opcode stacks. */
offsetsz = script->depth * sizeof(ptrdiff_t);
opcodesz = script->depth * sizeof(jsbytecode);
JS_ARENA_ALLOCATE(space, &cx->tempPool, offsetsz + opcodesz);
if (!space) {
ok = JS_FALSE;
goto out;
}
ss.offsets = (ptrdiff_t *) space;
ss.opcodes = (jsbytecode *) ((char *)space + offsetsz);
ss.top = 0;
/* Call recursive subroutine to do the hard work. */
oldscript = jp->script;
jp->script = script;
ok = Decompile(&ss, pc, len);
jp->script = oldscript;
/* If the given code didn't empty the stack, do it now. */
if (ss.top) {
do {
last = OFF2STR(&ss.sprinter, PopOff(&ss, JSOP_NOP));
} while (ss.top);
js_printf(jp, "%s", last);
}
out:
/* Free all temporary stuff allocated under this call. */
JS_ARENA_RELEASE(&cx->tempPool, mark);
return ok;
}
JSBool
js_DecompileScript(JSPrinter *jp, JSScript *script)
{
return js_DecompileCode(jp, script, script->code, (uintN)script->length);
}
static const char native_code_str[] = "\t[native code]\n";
JSBool
js_DecompileFunctionBody(JSPrinter *jp, JSFunction *fun)
{
JSScript *script;
JSScope *scope, *save;
JSBool ok;
if (!fun->interpreted) {
js_printf(jp, native_code_str);
return JS_TRUE;
}
script = fun->u.script;
scope = fun->object ? OBJ_SCOPE(fun->object) : NULL;
save = jp->scope;
jp->scope = scope;
ok = js_DecompileCode(jp, script, script->code, (uintN)script->length);
jp->scope = save;
return ok;
}
JSBool
js_DecompileFunction(JSPrinter *jp, JSFunction *fun)
{
JSContext *cx;
uintN i, nargs, indent;
void *mark;
JSAtom **params;
JSScope *scope, *oldscope;
JSScopeProperty *sprop;
JSBool ok;
/*
* If pretty, conform to ECMA-262 Edition 3, 15.3.4.2, by decompiling a
* FunctionDeclaration. Otherwise, check the JSFUN_LAMBDA flag and force
* an expression by parenthesizing.
*/
if (jp->pretty) {
js_printf(jp, "\t");
} else {
if (!jp->grouped && (fun->flags & JSFUN_LAMBDA))
js_puts(jp, "(");
}
if (fun->flags & JSFUN_GETTER)
js_printf(jp, "%s ", js_getter_str);
else if (fun->flags & JSFUN_SETTER)
js_printf(jp, "%s ", js_setter_str);
js_printf(jp, "%s ", js_function_str);
if (fun->atom && !QuoteString(&jp->sprinter, ATOM_TO_STRING(fun->atom), 0))
return JS_FALSE;
js_puts(jp, "(");
if (fun->interpreted && fun->object) {
/*
* Print the parameters.
*
* This code is complicated by the need to handle duplicate parameter
* names, as required by ECMA (bah!). A duplicate parameter is stored
* as another node with the same id (the parameter name) but different
* shortid (the argument index) along the property tree ancestor line
* starting at SCOPE_LAST_PROP(scope). Only the last duplicate param
* is mapped by the scope's hash table.
*/
cx = jp->sprinter.context;
nargs = fun->nargs;
mark = JS_ARENA_MARK(&cx->tempPool);
JS_ARENA_ALLOCATE_CAST(params, JSAtom **, &cx->tempPool,
nargs * sizeof(JSAtom *));
if (!params) {
JS_ReportOutOfMemory(cx);
return JS_FALSE;
}
scope = OBJ_SCOPE(fun->object);
for (sprop = SCOPE_LAST_PROP(scope); sprop; sprop = sprop->parent) {
if (sprop->getter != js_GetArgument)
continue;
JS_ASSERT(sprop->flags & SPROP_HAS_SHORTID);
JS_ASSERT((uint16) sprop->shortid < nargs);
JS_ASSERT(JSID_IS_ATOM(sprop->id));
params[(uint16) sprop->shortid] = JSID_TO_ATOM(sprop->id);
}
for (i = 0; i < nargs; i++) {
if (i > 0)
js_puts(jp, ", ");
if (!QuoteString(&jp->sprinter, ATOM_TO_STRING(params[i]), 0))
return JS_FALSE;
}
JS_ARENA_RELEASE(&cx->tempPool, mark);
#ifdef __GNUC__
} else {
scope = NULL;
#endif
}
js_printf(jp, ") {\n");
indent = jp->indent;
jp->indent += 4;
if (fun->interpreted && fun->object) {
oldscope = jp->scope;
jp->scope = scope;
ok = js_DecompileScript(jp, fun->u.script);
jp->scope = oldscope;
if (!ok) {
jp->indent = indent;
return JS_FALSE;
}
} else {
js_printf(jp, native_code_str);
}
jp->indent -= 4;
js_printf(jp, "\t}");
if (!jp->pretty) {
if (!jp->grouped && (fun->flags & JSFUN_LAMBDA))
js_puts(jp, ")");
}
return JS_TRUE;
}
JSString *
js_DecompileValueGenerator(JSContext *cx, intN spindex, jsval v,
JSString *fallback)
{
JSStackFrame *fp, *down;
jsbytecode *pc, *begin, *end, *tmp;
jsval *sp, *base, *limit;
JSScript *script;
JSOp op;
const JSCodeSpec *cs;
uint32 format, mode, type;
intN depth;
jssrcnote *sn;
uintN len, off;
JSPrinter *jp;
JSString *name;
for (fp = cx->fp; fp && !fp->script; fp = fp->down)
continue;
if (!fp)
goto do_fallback;
/* Try to find sp's generating pc depth slots under it on the stack. */
pc = fp->pc;
if (spindex == JSDVG_SEARCH_STACK) {
if (!pc) {
/*
* Current frame is native: look under it for a scripted call
* in which a decompilable bytecode string that generated the
* value as an actual argument might exist.
*/
JS_ASSERT(!fp->script && !(fp->fun && fp->fun->interpreted));
down = fp->down;
if (!down)
goto do_fallback;
script = down->script;
base = fp->argv;
limit = base + fp->argc;
} else {
/*
* This should be a script activation, either a top-level
* script or a scripted function. But be paranoid about calls
* to js_DecompileValueGenerator from code that hasn't fully
* initialized a (default-all-zeroes) frame.
*/
script = fp->script;
base = fp->spbase;
limit = fp->sp;
}
/*
* Pure paranoia about default-zeroed frames being active while
* js_DecompileValueGenerator is called. It can't hurt much now;
* error reporting performance is not an issue.
*/
if (!script || !base || !limit)
goto do_fallback;
/*
* Try to find operand-generating pc depth slots below sp.
*
* In the native case, we know the arguments have generating pc's
* under them, on account of fp->down->script being non-null: all
* compiled scripts get depth slots for generating pc's allocated
* upon activation, at the top of js_Interpret.
*
* In the script or scripted function case, the same reasoning
* applies to fp rather than to fp->down.
*/
for (sp = base; sp < limit; sp++) {
if (*sp == v) {
depth = (intN)script->depth;
pc = (jsbytecode *) sp[-depth];
break;
}
}
} else {
/*
* At this point, pc may or may not be null, i.e., we could be in
* a script activation, or we could be in a native frame that was
* called by another native function. Check pc and script.
*/
if (!pc)
goto do_fallback;
script = fp->script;
if (!script)
goto do_fallback;
if (spindex != JSDVG_IGNORE_STACK) {
JS_ASSERT(spindex < 0);
depth = (intN)script->depth;
#if !JS_HAS_NO_SUCH_METHOD
JS_ASSERT(-depth <= spindex);
#endif
spindex -= depth;
base = (jsval *) cx->stackPool.current->base;
limit = (jsval *) cx->stackPool.current->avail;
sp = fp->sp + spindex;
if (JS_UPTRDIFF(sp, base) < JS_UPTRDIFF(limit, base))
pc = (jsbytecode *) *sp;
}
}
/*
* Again, be paranoid, this time about possibly loading an invalid pc
* from sp[-(1+depth)].
*/
if (JS_UPTRDIFF(pc, script->code) >= (jsuword)script->length) {
pc = fp->pc;
if (!pc)
goto do_fallback;
}
op = (JSOp) *pc;
if (op == JSOP_TRAP)
op = JS_GetTrapOpcode(cx, script, pc);
/* XXX handle null as a special case, to avoid calling null "object" */
if (op == JSOP_NULL)
return ATOM_TO_STRING(cx->runtime->atomState.nullAtom);
cs = &js_CodeSpec[op];
format = cs->format;
mode = (format & JOF_MODEMASK);
/* NAME ops are self-contained, but others require left context. */
if (mode == JOF_NAME) {
begin = pc;
} else {
sn = js_GetSrcNote(script, pc);
if (!sn || (SN_TYPE(sn) != SRC_PCBASE && SN_TYPE(sn) != SRC_PCDELTA)) {
if (cs->token)
return JS_NewStringCopyZ(cx, cs->token);
goto do_fallback;
}
begin = pc - js_GetSrcNoteOffset(sn, 0);
}
end = pc + cs->length;
len = PTRDIFF(end, begin, jsbytecode);
if (format & (JOF_SET | JOF_DEL | JOF_INCDEC | JOF_IMPORT | JOF_FOR)) {
tmp = (jsbytecode *) JS_malloc(cx, len * sizeof(jsbytecode));
if (!tmp)
return NULL;
memcpy(tmp, begin, len * sizeof(jsbytecode));
if (mode == JOF_NAME) {
/*
* JOF_NAME does not imply JOF_CONST, so we must check for the
* QARG and QVAR format types and translate those to JSOP_GETARG
* or JSOP_GETVAR appropriately, instead of JSOP_NAME.
*/
type = format & JOF_TYPEMASK;
tmp[0] = (type == JOF_QARG)
? JSOP_GETARG
: (type == JOF_QVAR)
? JSOP_GETVAR
: JSOP_NAME;
} else {
/*
* We must replace the faulting pc's bytecode with a corresponding
* JSOP_GET* code. For JSOP_SET{PROP,ELEM}, we must use the "2nd"
* form of JSOP_GET{PROP,ELEM}, to throw away the assignment op's
* right-hand operand and decompile it as if it were a GET of its
* left-hand operand.
*/
off = len - cs->length;
JS_ASSERT(off == (uintN) PTRDIFF(pc, begin, jsbytecode));
if (mode == JOF_PROP) {
tmp[off] = (format & JOF_SET) ? JSOP_GETPROP2 : JSOP_GETPROP;
} else if (mode == JOF_ELEM) {
tmp[off] = (format & JOF_SET) ? JSOP_GETELEM2 : JSOP_GETELEM;
} else {
/*
* A zero mode means precisely that op is uncategorized for our
* purposes, so we must write per-op special case code here.
*/
switch (op) {
case JSOP_ENUMELEM:
tmp[off] = JSOP_GETELEM;
break;
#if JS_HAS_LVALUE_RETURN
case JSOP_SETCALL:
tmp[off] = JSOP_CALL;
break;
#endif
default:
JS_ASSERT(0);
}
}
}
begin = tmp;
} else {
/* No need to revise script bytecode. */
tmp = NULL;
}
name = NULL;
jp = js_NewPrinter(cx, "js_DecompileValueGenerator", 0, JS_FALSE);
if (jp) {
if (fp->fun && fp->fun->object) {
JS_ASSERT(OBJ_IS_NATIVE(fp->fun->object));
jp->scope = OBJ_SCOPE(fp->fun->object);
}
if (js_DecompileCode(jp, script, begin, len))
name = js_GetPrinterOutput(jp);
js_DestroyPrinter(jp);
}
if (tmp)
JS_free(cx, tmp);
return name;
do_fallback:
return fallback ? fallback : js_ValueToString(cx, v);
}