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Revert "[builtins] Fix Array.p.join length overflow and invalid string length handling"

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This reverts commit ec969ea3b1.

Reason for revert: test fails consistently on arm bots.
I can't repro the failure locally, but it does consume ~512MB of memory (for a single string, I think?), so my guess is that the bots don't have enough contiguous address space.

Original change's description:
> [builtins] Fix Array.p.join length overflow and invalid string length handling
> 
> - Fixes and simplify allocating the temporary fixed array for ToString-ed elements.
>   - When the array size is greater than representable by an intptr, it overflowed into a negative value causing a non-negative assert to fail.
>   - Simplify fallback behavior by always allocating a conservatively sized temporary fixed array. Previously, if the array had dictionary elements, the temporary fixed array was sized based on %GetNumberDictionaryNumberOfElements() and then resized when entering the fallback.
> 
> - Fixes related invalid string length handling. When the running total of the resulting string length overflowed or exceeded String::kMaxLength, a RangeError is thrown. Previously, this thrown RangeError bypassed JoinStackPop and left the receiver on the stack.
> 
> Bug: chromium:897404
> Change-Id: I157b71ef04ab06125a5b1c3454e5ed3713bdb591
> Reviewed-on: https://chromium-review.googlesource.com/c/1293070
> Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#56907}

TBR=danno@chromium.org,peter.wm.wong@gmail.com,jgruber@chromium.org,tebbi@chromium.org

Change-Id: I8ca80bd75833aacc94ccb25ceb82bbc8880991db
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:897404
Reviewed-on: https://chromium-review.googlesource.com/c/1297471
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56915}
This commit is contained in:
Jakob Kummerow 2018-10-23 22:07:40 +00:00 committed by Commit Bot
parent 0d75b76c64
commit 7a975d1116
8 changed files with 124 additions and 189 deletions
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91
src/builtins/array-join.tq
View File

@ -10,9 +10,15 @@ module array {
extern macro CallJSArrayArrayJoinConcatToSequentialString(
FixedArray, intptr, String, String): String;
extern macro CallArrayJoin(
Context, constexpr bool, JSReceiver, String, Number, Object, Object):
String
extern macro CallLoadJoinElement(implicit context: Context)(
LoadJoinElementFn, JSReceiver, Number): Object
labels IfException(Object);
extern macro CallConvertToLocaleString(implicit context: Context)(
Object, Object, Object): String
labels IfException(Object);
extern macro CallToString(implicit context: Context)(Object): String
labels IfException(Object);
builtin LoadJoinElement<T: type>(
@ -142,11 +148,11 @@ module array {
isOneByte: bool;
}
macro BufferInit(len: uintptr, sep: String): Buffer {
const cappedBufferSize: intptr = len > kFixedArrayMaxLength ?
macro BufferInit(estimatedNonHoleyElements: uintptr, sep: String): Buffer {
const bufferSize: intptr = Signed(estimatedNonHoleyElements + 1);
const cappedBufferSize: intptr = bufferSize > kFixedArrayMaxLength ?
FromConstexpr<intptr>(kFixedArrayMaxLength) :
Signed(len);
assert(cappedBufferSize > 0);
bufferSize;
const fixedArray: FixedArray = AllocateZeroedFixedArray(cappedBufferSize);
const isOneByte: bool = HasOnlyOneByteChars(sep.instanceType);
return Buffer{fixedArray, 0, 0, isOneByte};
@ -214,14 +220,17 @@ module array {
macro ArrayJoinImpl(
context: Context, receiver: JSReceiver, sep: String, lengthNumber: Number,
useToLocaleString: constexpr bool, locales: Object, options: Object,
initialLoadJoinElement: LoadJoinElementFn): String {
estimatedNonHoleyElements: uintptr,
initialLoadJoinElement: LoadJoinElementFn): String
labels IfException(Object) {
const initialMap: Map = receiver.map;
const len: uintptr = Convert<uintptr>(lengthNumber);
const separatorLength: intptr = sep.length;
let nofSeparators: intptr = 0;
let loadJoinElements: LoadJoinElementFn = initialLoadJoinElement;
let buffer: Buffer = BufferInit(len, sep);
let buffer: Buffer = BufferInit(estimatedNonHoleyElements, sep);
if (estimatedNonHoleyElements != 0) {
// 6. Let k be 0.
let k: uintptr = 0;
@ -238,18 +247,26 @@ module array {
CannotUseSameArrayAccessor(initialMap, lengthNumber, receiver))
deferred {
loadJoinElements = LoadJoinElement<GenericElementsAccessor>;
// Join the current buffer into a single string and add it to a
// new buffer that the fall back will continue with.
const temp: String = BufferJoin(buffer, sep);
buffer = BufferInit((len - k + 1), sep);
buffer = BufferAdd(buffer, temp, 0, separatorLength);
}
}
// b. Let element be ? Get(O, ! ToString(k)).
const element: Object =
loadJoinElements(context, receiver, Convert<Number>(k++));
const element: Object = CallLoadJoinElement(
loadJoinElements, receiver, Convert<Number>(k++))
otherwise IfException;
// c. If element is undefined or null, let next be the empty String;
// otherwise, let next be ? ToString(element).
let next: String;
if constexpr (useToLocaleString) {
next = ConvertToLocaleString(context, element, locales, options);
next = CallConvertToLocaleString(element, locales, options)
otherwise IfException;
if (next == kEmptyString) continue;
} else {
typeswitch (element) {
@ -262,7 +279,7 @@ module array {
}
case (obj: HeapObject): {
if (IsNullOrUndefined(obj)) continue;
next = ToString(context, obj);
next = CallToString(obj) otherwise IfException;
}
}
}
@ -271,6 +288,9 @@ module array {
buffer = BufferAdd(buffer, next, nofSeparators, separatorLength);
nofSeparators = 0;
}
} else {
nofSeparators = Signed(len - 1);
}
// Add any separators at the end.
buffer = BufferAddSeparators(buffer, nofSeparators, separatorLength, true);
@ -281,7 +301,8 @@ module array {
macro ArrayJoin(implicit context: Context)(
useToLocaleString: constexpr bool, receiver: JSReceiver, sep: String,
lenNumber: Number, locales: Object, options: Object): Object {
lenNumber: Number, locales: Object, options: Object): Object
labels IfException(Object) {
const map: Map = receiver.map;
const kind: ElementsKind = map.elements_kind;
const len: uintptr = Convert<uintptr>(lenNumber);
@ -289,6 +310,7 @@ module array {
// Estimated number of elements that are not holes. This is conservatively
// defaulted to `len`. When the receiver has dictionary elements, a better
// estimate can be determined through GetNumberDictionaryNumberOfElements.
let estimatedNonHoleyElements: uintptr = len;
let loadJoinElements: LoadJoinElementFn;
try {
@ -301,26 +323,14 @@ module array {
loadJoinElements = LoadJoinElement<FastSmiOrObjectElements>;
} else if (IsElementsKindLessThanOrEqual(kind, HOLEY_DOUBLE_ELEMENTS)) {
loadJoinElements = LoadJoinElement<FastDoubleElements>;
} else if (kind == DICTIONARY_ELEMENTS)
deferred {
} else if (kind == DICTIONARY_ELEMENTS) {
const dict: NumberDictionary =
UnsafeCast<NumberDictionary>(array.elements);
const nofElements: Smi = GetNumberDictionaryNumberOfElements(dict);
if (nofElements == 0) {
if (sep == kEmptyString) return kEmptyString;
try {
const nofSeparators: Smi =
Cast<Smi>(lenNumber - 1) otherwise IfNotSmi;
return StringRepeat(context, sep, nofSeparators);
}
label IfNotSmi {
ThrowRangeError(context, kInvalidStringLength);
}
} else {
estimatedNonHoleyElements =
Unsigned(Convert<intptr>(GetNumberDictionaryNumberOfElements(dict)))
<< 1;
loadJoinElements = LoadJoinElement<DictionaryElements>;
}
}
else {
} else {
goto IfSlowPath;
}
}
@ -329,19 +339,8 @@ module array {
}
return ArrayJoinImpl(
context, receiver, sep, lenNumber, useToLocaleString, locales, options,
loadJoinElements);
}
builtin ArrayJoinWithToLocaleString(
context: Context, receiver: JSReceiver, sep: String, len: Number,
locales: Object, options: Object): Object {
return ArrayJoin(true, receiver, sep, len, locales, options);
}
builtin ArrayJoinWithoutToLocaleString(
context: Context, receiver: JSReceiver, sep: String, len: Number,
locales: Object, options: Object): Object {
return ArrayJoin(false, receiver, sep, len, locales, options);
estimatedNonHoleyElements, loadJoinElements)
otherwise IfException;
}
// The Join Stack detects cyclical calls to Array Join builtins
@ -473,8 +472,8 @@ module array {
JoinStackPushInline(o) otherwise IfReturnEmpty;
const result: Object = CallArrayJoin(
context, useToLocaleString, o, sep, len, locales, options)
const result: Object =
ArrayJoin(useToLocaleString, o, sep, len, locales, options)
otherwise IfException;
JoinStackPopInline(o);

1
src/builtins/base.tq
View File

@ -1168,4 +1168,3 @@ extern macro TryIntPtrAdd(intptr, intptr): intptr
labels IfOverflow;
extern builtin ObjectToString(Context, Object): Object;
extern builtin StringRepeat(Context, String, Number): String;

45
src/builtins/builtins-array-gen.h
View File

@ -91,16 +91,43 @@ class ArrayBuiltinsAssembler : public BaseBuiltinsFromDSLAssembler {
// Temporary Torque support for Array.prototype.join().
// TODO(pwong): Remove this when Torque supports exception handlers.
TNode<String> CallArrayJoin(TNode<Context> context, bool use_to_locale_string,
TNode<JSReceiver> receiver, TNode<String> sep,
TNode<Number> len, TNode<Object> locales,
TNode<Object> options, Label* if_exception,
TNode<Object> CallLoadJoinElement(TNode<Context> context,
TNode<Code> loadJoinElement,
TNode<JSReceiver> receiver, TNode<Number> k,
Label* if_exception,
TVariable<Object>* var_exception) {
Builtins::Name builtin = use_to_locale_string
? Builtins::kArrayJoinWithToLocaleString
: Builtins::kArrayJoinWithoutToLocaleString;
TNode<Object> result =
CallBuiltin(builtin, context, receiver, sep, len, locales, options);
// Calling a specialization of LoadJoinElement (see array-join.tq), requires
// a descriptor. We arbitrarily use one of specialization's descriptor, as
// all specializations share the same interface.
TNode<Object> result = CallStub(
Builtins::CallableFor(isolate(),
Builtins::kLoadJoinElement20ATDictionaryElements)
.descriptor(),
loadJoinElement, context, receiver, k);
GotoIfException(result, if_exception, var_exception);
return result;
}
// Temporary Torque support for Array.prototype.join().
// TODO(pwong): Remove this when Torque supports exception handlers.
TNode<String> CallConvertToLocaleString(TNode<Context> context,
TNode<Object> element,
TNode<Object> locales,
TNode<Object> options,
Label* if_exception,
TVariable<Object>* var_exception) {
TNode<Object> result = CallBuiltin(Builtins::kConvertToLocaleString,
context, element, locales, options);
GotoIfException(result, if_exception, var_exception);
return CAST(result);
}
// Temporary Torque support for Array.prototype.join().
// TODO(pwong): Remove this when Torque supports exception handlers.
TNode<String> CallToString(TNode<Context> context, TNode<Object> obj,
Label* if_exception,
TVariable<Object>* var_exception) {
TNode<Object> result = CallBuiltin(Builtins::kToString, context, obj);
GotoIfException(result, if_exception, var_exception);
return CAST(result);
}

1
src/builtins/builtins-string-gen.cc
View File

@ -1257,6 +1257,7 @@ TF_BUILTIN(StringRepeat, StringBuiltinsAssembler) {
CSA_ASSERT(this, IsString(string));
CSA_ASSERT(this, Word32BinaryNot(IsEmptyString(string)));
CSA_ASSERT(this, TaggedIsPositiveSmi(count));
CSA_ASSERT(this, SmiLessThanOrEqual(count, SmiConstant(String::kMaxLength)));
// The string is repeated with the following algorithm:
// let n = count;

4
src/torque/csa-generator.cc
View File

@ -254,11 +254,7 @@ void CSAGenerator::EmitInstruction(
out_ << ", &" << var_names[i][j];
}
}
if (return_type->IsStructType()) {
out_ << ").Flatten();\n";
} else {
out_ << ");\n";
}
if (instruction.return_continuation) {
out_ << " Goto(&" << BlockName(*instruction.return_continuation);
for (const std::string& value : *stack) {

63
test/mjsunit/array-join-invalid-string-length.js
View File

@ -1,63 +0,0 @@
// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax
(function DictionaryStringRepeatFastPath() {
const a = new Array(%StringMaxLength());
assertTrue(%HasDictionaryElements(a));
const sep = '12';
assertThrows(() => a.join(sep), RangeError);
// Verifies cycle detection still works properly after thrown error.
assertThrows(() => a.join(sep), RangeError);
a.length = 3;
a[0] = 'a';
a[1] = 'b';
a[2] = 'c';
assertSame('a,b,c', a.join());
})();
(function SeparatorOverflow() {
const a = ['a',,,,,'b'];
const sep = ','.repeat(%StringMaxLength());
assertThrows(() => a.join(sep), RangeError);
// Verifies cycle detection still works properly after thrown error.
assertThrows(() => a.join(sep), RangeError);
assertSame('a,,,,,b', a.join());
})();
(function ElementOverflow() {
const el = ','.repeat(%StringMaxLength());
const a = [el, el, el, el, el];
assertThrows(() => a.join(), RangeError);
// Verifies cycle detection still works properly after thrown error.
assertThrows(() => a.join(), RangeError);
a[0] = 'a';
a[1] = 'b';
a[2] = 'c';
a[3] = 'd';
a[4] = 'e';
assertSame('a,b,c,d,e', a.join());
})();
(function ElementSeparatorOverflow() {
const el = ','.repeat(%StringMaxLength());
const a = [el, el, el, el];
assertThrows(() => a.join(el), RangeError);
// Verifies cycle detection still works properly after thrown error.
assertThrows(() => a.join(el), RangeError);
a[0] = 'a';
a[1] = 'b';
a[2] = 'c';
a[3] = 'd';
assertSame('a,b,c,d', a.join());
})();

4
test/mjsunit/messages.js
View File

@ -570,10 +570,6 @@ test(function() {
"a".repeat(1 << 30);
}, "Invalid string length", RangeError);
test(function() {
new Array(1 << 30).join();
}, "Invalid string length", RangeError);
// kNormalizationForm
test(function() {
"".normalize("ABC");

20
test/mjsunit/regress/regress-crbug-897404.js
View File

@ -1,20 +0,0 @@
// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
function TestError() {}
// Force slow, generic assess path that will always allocate a temporary fixed
// array.
String.prototype.__defineGetter__(0, function() { });
const a = new Array(2**32 - 1);
// Force early exit to avoid an unreasonably long test.
a[0] = {
toString() { throw new TestError(); }
};
// Verify join throws test error and does not fail due to asserts (Negative
// length fixed array allocation).
assertThrows(() => a.join(), TestError);