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Bug 587366: regexp failure for flat text replace. (r=lw)

This commit is contained in:
Chris Leary 2010-08-24 14:46:19 -07:00
Родитель ba7ea60dac
Коммит cefc427999
9 изменённых файлов: 409 добавлений и 140 удалений
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461
js/src/jsstr.cpp
Просмотреть файл

@ -1631,119 +1631,153 @@ str_trimRight(JSContext *cx, uintN argc, Value *vp)
* Perl-inspired string functions.
*/
/* Result of a successfully performed flat match. */
class FlatMatch
{
JSString *patstr;
const jschar *pat;
size_t patlen;
int32 match_;
friend class RegExpGuard;
public:
JSString *pattern() const { return patstr; }
size_t patternLength() const { return patlen; }
/*
* RegExpGuard factors logic out of String regexp operations. After each
* operation completes, RegExpGuard data members become available, according to
* the comments below.
* @note The match is -1 when the match is performed successfully,
* but no match is found.
*/
int32 match() const { return match_; }
};
/* A regexp and optional associated object. */
class RegExpPair
{
JSObject *reobj_;
RegExp *re_;
explicit RegExpPair(RegExp *re): re_(re) {}
friend class RegExpGuard;
public:
/* @note May be null. */
JSObject *reobj() const { return reobj_; }
RegExp &re() const { JS_ASSERT(re_); return *re_; }
};
/*
* RegExpGuard factors logic out of String regexp operations.
*
* Notes on parameters to RegExpGuard member functions:
* - 'optarg' indicates in which argument position RegExp flags will be found,
* if present. This is a Mozilla extension and not part of any ECMA spec.
* - 'flat' indicates that the given pattern string will not be interpreted as
* a regular expression, hence regexp meta-characters are ignored.
* @param optarg Indicates in which argument position RegExp
* flags will be found, if present. This is a Mozilla
* extension and not part of any ECMA spec.
*/
class RegExpGuard
{
RegExpGuard(const RegExpGuard &);
void operator=(const RegExpGuard &);
JSContext *mCx;
JSObject *mReobj;
js::RegExp *mRe;
public:
RegExpGuard(JSContext *cx) : mCx(cx), mRe(NULL) {}
~RegExpGuard() {
if (mRe)
mRe->decref(mCx);
}
JSContext* cx() const { return mCx; }
/* init must succeed in order to call tryFlatMatch or normalizeRegExp. */
bool
init(uintN argc, Value *vp)
{
if (argc != 0 && VALUE_IS_REGEXP(mCx, vp[2])) {
mReobj = &vp[2].toObject();
mRe = static_cast<js::RegExp *>(mReobj->getPrivate());
mRe->incref(mCx);
} else {
patstr = ArgToRootedString(mCx, argc, vp, 0);
if (!patstr)
return false;
}
return true;
}
JSContext *cx;
RegExpPair rep;
FlatMatch fm;
/*
* Upper bound on the number of characters we are willing to potentially
* waste on searching for RegExp meta-characters.
*/
static const size_t sMaxFlatPatLen = 256;
static const size_t MAX_FLAT_PAT_LEN = 256;
/*
* Attempt to match |patstr| with |textstr|. Return false if flat matching
* could not be used.
*/
public:
explicit RegExpGuard(JSContext *cx) : cx(cx), rep(NULL) {}
~RegExpGuard() {
if (rep.re_)
rep.re_->decref(cx);
}
/* init must succeed in order to call tryFlatMatch or normalizeRegExp. */
bool
tryFlatMatch(JSString *textstr, bool flat, uintN optarg, uintN argc)
init(uintN argc, Value *vp)
{
if (mRe)
return false;
patstr->getCharsAndLength(pat, patlen);
if (optarg < argc ||
(!flat &&
(patlen > sMaxFlatPatLen || RegExp::hasMetaChars(pat, patlen)))) {
if (argc != 0 && VALUE_IS_REGEXP(cx, vp[2])) {
rep.reobj_ = &vp[2].toObject();
rep.re_ = RegExp::extractFrom(rep.reobj_);
rep.re_->incref(cx);
} else {
fm.patstr = ArgToRootedString(cx, argc, vp, 0);
if (!fm.patstr)
return false;
}
return true;
}
/*
* Attempt to match |patstr| to |textstr|. A flags argument, metachars in the
* pattern string, or a lengthy pattern string can thwart this process.
*
* @param checkMetaChars Look for regexp metachars in the pattern string.
* @return Whether flat matching could be used.
*/
const FlatMatch *
tryFlatMatch(JSString *textstr, uintN optarg, uintN argc, bool checkMetaChars = true)
{
if (rep.re_)
return NULL;
fm.patstr->getCharsAndLength(fm.pat, fm.patlen);
if (optarg < argc)
return NULL;
if (checkMetaChars &&
(fm.patlen > MAX_FLAT_PAT_LEN || RegExp::hasMetaChars(fm.pat, fm.patlen))) {
return NULL;
}
/*
* textstr could be a rope, so we want to avoid flattening it for as
* long as possible.
*/
if (textstr->isTopNode()) {
match = RopeMatch(textstr, pat, patlen);
fm.match_ = RopeMatch(textstr, fm.pat, fm.patlen);
} else {
const jschar *text;
size_t textlen;
textstr->getCharsAndLength(text, textlen);
match = StringMatch(text, textlen, pat, patlen);
fm.match_ = StringMatch(text, textlen, fm.pat, fm.patlen);
}
return true;
return &fm;
}
/* Data available on successful return from |tryFlatMatch|. */
JSString *patstr;
const jschar *pat;
size_t patlen;
jsint match;
/* If the pattern is not already a regular expression, make it so. */
bool
const RegExpPair *
normalizeRegExp(bool flat, uintN optarg, uintN argc, Value *vp)
{
/* If we don't have a RegExp, build RegExp from pattern string. */
if (mRe)
return true;
if (rep.re_)
return &rep;
JSString *opt;
if (optarg < argc) {
opt = js_ValueToString(mCx, vp[2 + optarg]);
opt = js_ValueToString(cx, vp[2 + optarg]);
if (!opt)
return false;
return NULL;
} else {
opt = NULL;
}
mRe = RegExp::createFlagged(mCx, patstr, opt);
if (!mRe)
return false;
mReobj = NULL;
return true;
rep.re_ = RegExp::createFlagged(cx, fm.patstr, opt);
if (!rep.re_)
return NULL;
rep.reobj_ = NULL;
return &rep;
}
/* Data available on successful return from |normalizeRegExp|. */
JSObject *reobj() const { return mReobj; } /* nullable */
js::RegExp *re() const { return mRe; } /* non-null */
#if DEBUG
bool hasRegExpPair() const { return rep.re_; }
#endif
};
/* js_ExecuteRegExp indicates success in two ways, based on the 'test' flag. */
@ -1771,15 +1805,15 @@ enum MatchControlFlags {
/* Factor out looping and matching logic. */
static bool
DoMatch(JSContext *cx, Value *vp, JSString *str, const RegExpGuard &g,
DoMatch(JSContext *cx, Value *vp, JSString *str, const RegExpPair &rep,
DoMatchCallback callback, void *data, MatchControlFlags flags)
{
RegExp &re = *g.re();
RegExp &re = rep.re();
if (re.global()) {
/* global matching ('g') */
bool testGlobal = flags & TEST_GLOBAL_BIT;
if (g.reobj())
g.reobj()->zeroRegExpLastIndex();
if (rep.reobj())
rep.reobj()->zeroRegExpLastIndex();
for (size_t count = 0, i = 0, length = str->length(); i <= length; ++count) {
if (!re.execute(cx, str, &i, testGlobal, vp))
return false;
@ -1804,10 +1838,9 @@ DoMatch(JSContext *cx, Value *vp, JSString *str, const RegExpGuard &g,
}
static bool
BuildFlatMatchArray(JSContext *cx, JSString *textstr, const RegExpGuard &g,
Value *vp)
BuildFlatMatchArray(JSContext *cx, JSString *textstr, const FlatMatch &fm, Value *vp)
{
if (g.match < 0) {
if (fm.match() < 0) {
vp->setNull();
return true;
}
@ -1818,9 +1851,9 @@ BuildFlatMatchArray(JSContext *cx, JSString *textstr, const RegExpGuard &g,
return false;
vp->setObject(*obj);
return obj->defineProperty(cx, INT_TO_JSID(0), StringValue(g.patstr)) &&
return obj->defineProperty(cx, INT_TO_JSID(0), StringValue(fm.pattern())) &&
obj->defineProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.indexAtom),
Int32Value(g.match)) &&
Int32Value(fm.match())) &&
obj->defineProperty(cx, ATOM_TO_JSID(cx->runtime->atomState.inputAtom),
StringValue(textstr));
}
@ -1860,18 +1893,20 @@ str_match(JSContext *cx, uintN argc, Value *vp)
RegExpGuard g(cx);
if (!g.init(argc, vp))
return false;
if (g.tryFlatMatch(str, false, 1, argc))
return BuildFlatMatchArray(cx, str, g, vp);
if (!g.normalizeRegExp(false, 1, argc, vp))
if (const FlatMatch *fm = g.tryFlatMatch(str, 1, argc))
return BuildFlatMatchArray(cx, str, *fm, vp);
const RegExpPair *rep = g.normalizeRegExp(false, 1, argc, vp);
if (!rep)
return false;
AutoObjectRooter array(cx);
MatchArgType arg = array.addr();
if (!DoMatch(cx, vp, str, g, MatchCallback, arg, MATCH_ARGS))
if (!DoMatch(cx, vp, str, *rep, MatchCallback, arg, MATCH_ARGS))
return false;
/* When not global, DoMatch will leave |RegExp.exec()| in *vp. */
if (g.re()->global())
if (rep->re().global())
vp->setObjectOrNull(array.object());
return true;
}
@ -1885,15 +1920,16 @@ str_search(JSContext *cx, uintN argc, Value *vp)
RegExpGuard g(cx);
if (!g.init(argc, vp))
return false;
if (g.tryFlatMatch(str, false, 1, argc)) {
vp->setInt32(g.match);
if (const FlatMatch *fm = g.tryFlatMatch(str, 1, argc)) {
vp->setInt32(fm->match());
return true;
}
if (!g.normalizeRegExp(false, 1, argc, vp))
const RegExpPair *rep = g.normalizeRegExp(false, 1, argc, vp);
if (!rep)
return false;
size_t i = 0;
if (!g.re()->execute(cx, str, &i, true, vp))
if (!rep->re().execute(cx, str, &i, true, vp))
return false;
if (vp->isTrue())
@ -2056,8 +2092,8 @@ FindReplaceLength(JSContext *cx, ReplaceData &rdata, size_t *sizep)
}
/* Push match index and input string. */
sp++->setInt32(statics.get(0, 0));
sp++->setString(rdata.str);
sp[0].setInt32(statics.get(0, 0));
sp[1].setString(rdata.str);
if (!Invoke(cx, rdata.args, 0))
return false;
@ -2151,16 +2187,11 @@ ReplaceCallback(JSContext *cx, size_t count, void *p)
static bool
BuildFlatReplacement(JSContext *cx, JSString *textstr, JSString *repstr,
const RegExpGuard &g, Value *vp)
const FlatMatch &fm, Value *vp)
{
if (g.match == -1) {
vp->setString(textstr);
return true;
}
JSRopeBuilder builder(cx);
size_t match = g.match; /* Avoid signed/unsigned warnings. */
size_t matchEnd = match + g.patlen;
size_t match = fm.match(); /* Avoid signed/unsigned warnings. */
size_t matchEnd = match + fm.patternLength();
if (textstr->isTopNode()) {
/*
@ -2186,8 +2217,8 @@ BuildFlatReplacement(JSContext *cx, JSString *textstr, JSString *repstr,
*/
JSString *leftSide = js_NewDependentString(cx, str, 0, match - pos);
if (!leftSide ||
!builder.append(cx, leftSide) ||
!builder.append(cx, repstr)) {
!builder.append(leftSide) ||
!builder.append(repstr)) {
return false;
}
}
@ -2199,11 +2230,11 @@ BuildFlatReplacement(JSContext *cx, JSString *textstr, JSString *repstr,
if (strEnd > matchEnd) {
JSString *rightSide = js_NewDependentString(cx, str, matchEnd - pos,
strEnd - matchEnd);
if (!rightSide || !builder.append(cx, rightSide))
if (!rightSide || !builder.append(rightSide))
return false;
}
} else {
if (!builder.append(cx, str))
if (!builder.append(str))
return false;
}
pos += str->length();
@ -2212,12 +2243,12 @@ BuildFlatReplacement(JSContext *cx, JSString *textstr, JSString *repstr,
JSString *leftSide = js_NewDependentString(cx, textstr, 0, match);
if (!leftSide)
return false;
JSString *rightSide = js_NewDependentString(cx, textstr, match + g.patlen,
textstr->length() - match - g.patlen);
JSString *rightSide = js_NewDependentString(cx, textstr, match + fm.patternLength(),
textstr->length() - match - fm.patternLength());
if (!rightSide ||
!builder.append(cx, leftSide) ||
!builder.append(cx, repstr) ||
!builder.append(cx, rightSide)) {
!builder.append(leftSide) ||
!builder.append(repstr) ||
!builder.append(rightSide)) {
return false;
}
}
@ -2226,6 +2257,172 @@ BuildFlatReplacement(JSContext *cx, JSString *textstr, JSString *repstr,
return true;
}
/*
* Perform a linear-scan dollar substitution on the replacement text,
* constructing a result string that looks like:
*
* newstring = string[:matchStart] + dollarSub(replaceValue) + string[matchLimit:]
*/
static inline bool
BuildDollarReplacement(JSContext *cx, JSString *textstr, JSString *repstr,
const jschar *firstDollar, const FlatMatch &fm, Value *vp)
{
JS_ASSERT(repstr->chars() <= firstDollar && firstDollar < repstr->chars() + repstr->length());
size_t matchStart = fm.match();
size_t matchLimit = matchStart + fm.patternLength();
JSCharBuffer newReplaceChars(cx);
/*
* Most probably:
*
* len(newstr) >= len(orig) - len(match) + len(replacement)
*
* Note that dollar vars _could_ make the resulting text smaller than this.
*/
if (!newReplaceChars.reserve(textstr->length() - fm.patternLength() + repstr->length()))
return false;
/* Move the pre-dollar chunk in bulk. */
JS_ALWAYS_TRUE(newReplaceChars.append(repstr->chars(), firstDollar));
/* Move the rest char-by-char, interpreting dollars as we encounter them. */
#define ENSURE(__cond) if (!(__cond)) return false;
const jschar *repstrLimit = repstr->chars() + repstr->length();
for (const jschar *it = firstDollar; it < repstrLimit; ++it) {
if (*it != '$' || it == repstrLimit - 1) {
ENSURE(newReplaceChars.append(*it));
continue;
}
switch (*(it + 1)) {
case '$': /* Eat one of the dollars. */
ENSURE(newReplaceChars.append(*it));
break;
case '&':
ENSURE(newReplaceChars.append(textstr->chars() + matchStart,
textstr->chars() + matchLimit));
break;
case '`':
ENSURE(newReplaceChars.append(textstr->chars(), textstr->chars() + matchStart));
break;
case '\'':
ENSURE(newReplaceChars.append(textstr->chars() + matchLimit,
textstr->chars() + textstr->length()));
break;
default: /* The dollar we saw was not special (no matter what its mother told it). */
ENSURE(newReplaceChars.append(*it));
continue;
}
++it; /* We always eat an extra char in the above switch. */
}
JSString *leftSide = js_NewDependentString(cx, textstr, 0, matchStart);
ENSURE(leftSide);
JSString *newReplace = js_NewStringFromCharBuffer(cx, newReplaceChars);
ENSURE(newReplace);
JS_ASSERT(textstr->length() >= matchLimit);
JSString *rightSide = js_NewDependentString(cx, textstr, matchLimit,
textstr->length() - matchLimit);
ENSURE(rightSide);
JSRopeBuilder builder(cx);
ENSURE(builder.append(leftSide) &&
builder.append(newReplace) &&
builder.append(rightSide));
#undef ENSURE
vp->setString(builder.getStr());
return true;
}
static inline bool
str_replace_regexp(JSContext *cx, uintN argc, Value *vp, ReplaceData &rdata)
{
const RegExpPair *rep = rdata.g.normalizeRegExp(true, 2, argc, vp);
if (!rep)
return false;
rdata.index = 0;
rdata.leftIndex = 0;
rdata.calledBack = false;
if (!DoMatch(cx, vp, rdata.str, *rep, ReplaceCallback, &rdata, REPLACE_ARGS))
return false;
if (!rdata.calledBack) {
/* Didn't match, so the string is unmodified. */
vp->setString(rdata.str);
return true;
}
JSSubString sub;
cx->regExpStatics.getRightContext(&sub);
if (!rdata.cb.append(sub.chars, sub.length))
return false;
JSString *retstr = js_NewStringFromCharBuffer(cx, rdata.cb);
if (!retstr)
return false;
vp->setString(retstr);
return true;
}
static inline bool
str_replace_flat_lambda(JSContext *cx, uintN argc, Value *vp, ReplaceData &rdata,
const FlatMatch &fm)
{
JS_ASSERT(fm.match() >= 0);
LeaveTrace(cx);
JSString *matchStr = js_NewDependentString(cx, rdata.str, fm.match(), fm.patternLength());
if (!matchStr)
return false;
/* lambda(matchStr, matchStart, textstr) */
static const uint32 lambdaArgc = 3;
if (!cx->stack().pushInvokeArgs(cx, lambdaArgc, rdata.args))
return false;
CallArgs &args = rdata.args;
args.callee().setObject(*rdata.lambda);
args.thisv().setObjectOrNull(rdata.lambda->getParent());
Value *sp = args.argv();
sp[0].setString(matchStr);
sp[1].setInt32(fm.match());
sp[2].setString(rdata.str);
if (!Invoke(cx, rdata.args, 0))
return false;
JSString *repstr = js_ValueToString(cx, args.rval());
if (!repstr)
return false;
JSString *leftSide = js_NewDependentString(cx, rdata.str, 0, fm.match());
if (!leftSide)
return false;
size_t matchLimit = fm.match() + fm.patternLength();
JSString *rightSide = js_NewDependentString(cx, rdata.str, matchLimit,
rdata.str->length() - matchLimit);
if (!rightSide)
return false;
JSRopeBuilder builder(cx);
if (!(builder.append(leftSide) &&
builder.append(repstr) &&
builder.append(rightSide))) {
return false;
}
vp->setString(builder.getStr());
return true;
}
JSBool
js::str_replace(JSContext *cx, uintN argc, Value *vp)
{
@ -2253,37 +2450,39 @@ js::str_replace(JSContext *cx, uintN argc, Value *vp)
if (!rdata.g.init(argc, vp))
return false;
if (!rdata.dollar && !rdata.lambda &&
rdata.g.tryFlatMatch(rdata.str, true, 2, argc)) {
return BuildFlatReplacement(cx, rdata.str, rdata.repstr, rdata.g, vp);
/*
* Unlike its |String.prototype| brethren, |replace| doesn't convert
* its input to a regular expression. (Even if it contains metachars.)
*
* However, if the user invokes our (non-standard) |flags| argument
* extension then we revert to creating a regular expression. Note that
* this is observable behavior through the side-effect mutation of the
* |RegExp| statics.
*/
const FlatMatch *fm = rdata.g.tryFlatMatch(rdata.str, 2, argc, false);
if (!fm) {
JS_ASSERT_IF(!rdata.g.hasRegExpPair(), argc > 2);
return str_replace_regexp(cx, argc, vp, rdata);
}
if (!rdata.g.normalizeRegExp(true, 2, argc, vp))
return false;
rdata.index = 0;
rdata.leftIndex = 0;
rdata.calledBack = false;
if (!DoMatch(cx, vp, rdata.str, rdata.g, ReplaceCallback, &rdata, REPLACE_ARGS))
return false;
if (!rdata.calledBack) {
/* Didn't match, so the string is unmodified. */
if (fm->match() < 0) {
vp->setString(rdata.str);
return true;
}
JSSubString sub;
cx->regExpStatics.getRightContext(&sub);
if (!rdata.cb.append(sub.chars, sub.length))
return false;
if (rdata.lambda)
return str_replace_flat_lambda(cx, argc, vp, rdata, *fm);
JSString *retstr = js_NewStringFromCharBuffer(cx, rdata.cb);
if (!retstr)
return false;
/*
* Note: we could optimize the text.length == pattern.length case if we wanted,
* even in the presence of dollar metachars.
*/
if (rdata.dollar)
return BuildDollarReplacement(cx, rdata.str, rdata.repstr, rdata.dollar, *fm, vp);
vp->setString(retstr);
return true;
return BuildFlatReplacement(cx, rdata.str, rdata.repstr, *fm, vp);
}
/*

8
js/src/jsstr.h
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@ -678,17 +678,15 @@ class JSRopeLeafIterator {
};
class JSRopeBuilder {
private:
JSContext * const cx;
JSString *mStr;
public:
JSRopeBuilder(JSContext *cx);
inline bool append(JSContext *cx, JSString *str) {
inline bool append(JSString *str) {
mStr = js_ConcatStrings(cx, mStr, str);
if (!mStr)
return false;
return true;
return !!mStr;
}
inline JSString *getStr() {

5
js/src/jsstrinlines.h
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@ -76,8 +76,7 @@ JSString::intString(jsint i)
}
inline
JSRopeBuilder::JSRopeBuilder(JSContext *cx) {
mStr = cx->runtime->emptyString;
}
JSRopeBuilder::JSRopeBuilder(JSContext *cx)
: cx(cx), mStr(cx->runtime->emptyString) {}
#endif /* jsstrinlines_h___ */

66
js/src/tests/ecma_5/String/15.5.4.11-01.js Normal file
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@ -0,0 +1,66 @@
/*
* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/licenses/publicdomain/
*/
var BUGNUMBER = 587366;
var summary = "String.prototype.replace with non-regexp searchValue";
print(BUGNUMBER + ": " + summary);
/**************
* BEGIN TEST *
**************/
/*
* Check that regexp statics are preserved across the whole test.
* If the engine is trying to cheat by turning stuff into regexps,
* we should catch it!
*/
/(a|(b)|c)+/.exec('abcabc');
var before = {
"source" : RegExp.source,
"$`": RegExp.leftContext,
"$'": RegExp.rightContext,
"$&": RegExp.lastMatch,
"$1": RegExp.$1,
"$2": RegExp.$2
};
var text = 'I once was lost but now am found.';
var searchValue = 'found';
var replaceValue;
/* Lambda substitution. */
replaceValue = function(matchStr, matchStart, textStr) {
assertEq(matchStr, searchValue);
assertEq(matchStart, 27);
assertEq(textStr, text);
return 'not watching that show anymore';
}
var result = text.replace(searchValue, replaceValue);
assertEq(result, 'I once was lost but now am not watching that show anymore.');
/* Dollar substitution. */
replaceValue = "...wait, where was I again? And where is all my $$$$$$? Oh right, $`$&$'" +
" But with no $$$$$$"; /* Note the dot is not replaced and trails the end. */
result = text.replace(searchValue, replaceValue);
assertEq(result, 'I once was lost but now am ...wait, where was I again?' +
' And where is all my $$$? Oh right, I once was lost but now am found.' +
' But with no $$$.');
/* Missing capture group dollar substitution. */
replaceValue = "$1$&$2$'$3";
result = text.replace(searchValue, replaceValue);
assertEq(result, 'I once was lost but now am $1found$2.$3.');
/* Check RegExp statics haven't been mutated. */
for (var ident in before)
assertEq(RegExp[ident], before[ident]);
/******************************************************************************/
if (typeof reportCompare === "function")
reportCompare(true, true);
print("All tests passed!");

1
js/src/tests/ecma_5/String/browser.js Normal file
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@ -0,0 +1 @@

2
js/src/tests/ecma_5/String/jstests.list Normal file
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@ -0,0 +1,2 @@
url-prefix ../../jsreftest.html?test=ecma_5/String/
script 15.5.4.11-01.js

0
js/src/tests/ecma_5/String/shell.js Normal file
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1
js/src/tests/ecma_5/jstests.list
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@ -6,6 +6,7 @@ include Global/jstests.list
include JSON/jstests.list
include Object/jstests.list
include RegExp/jstests.list
include String/jstests.list
include Types/jstests.list
include extensions/jstests.list
include misc/jstests.list

3
js/src/trace-test/tests/basic/bug587366.js Normal file
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@ -0,0 +1,3 @@
// Test flat string replacement, per ECMAScriptv5 15.5.4.11.
assertEq("1+2".replace("1+2", "$&+3"), "1+2+3");
assertEq(")".replace(")","*$&*"), "*)*");