Reviewers: danno,
Message:
PTAL.
Description:
Fix possible crash in FixedDoubleArray::Initialize()
(this only affected ia32).
BUG=95113
TEST=mjsunit/regress/regress-95113.js passes without crashing.
Please review this at http://codereview.chromium.org/7833040/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files:
M src/objects-inl.h
A test/mjsunit/regress/regress-95113.js
Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index
3b0e96f1ef93793398b98eb7a5daa50ca1c156a6..02f56ce1ae2aee7bf280284c5cddb17112573e28
100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1749,9 +1749,17 @@ bool FixedDoubleArray::is_the_hole(int index) {
void FixedDoubleArray::Initialize(FixedDoubleArray* from) {
int old_length = from->length();
ASSERT(old_length < length());
- OS::MemCopy(FIELD_ADDR(this, kHeaderSize),
- FIELD_ADDR(from, kHeaderSize),
- old_length * kDoubleSize);
+ if (old_length * kDoubleSize >= OS::kMinComplexMemCopy) {
+ OS::MemCopy(FIELD_ADDR(this, kHeaderSize),
+ FIELD_ADDR(from, kHeaderSize),
+ old_length * kDoubleSize);
+ } else {
+ int offset = kHeaderSize;
+ for (int i = 0; i < old_length; ++i) {
+ WRITE_DOUBLE_FIELD(this, offset, READ_DOUBLE_FIELD(from, offset));
+ offset += kDoubleSize;
+ }
+ }
int offset = kHeaderSize + old_length * kDoubleSize;
for (int current = from->length(); current < length(); ++current) {
WRITE_DOUBLE_FIELD(this, offset, hole_nan_as_double());
Index: test/mjsunit/regress/regress-95113.js
diff --git a/test/mjsunit/regress/regress-95113.js
b/test/mjsunit/regress/regress-95113.js
new file mode 100644
index
0000000000000000000000000000000000000000..f01b27004cffa4b54261bea10380104961739a24
--- /dev/null
+++ b/test/mjsunit/regress/regress-95113.js
@@ -0,0 +1,48 @@
+// Copyright 2011 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --allow-natives-syntax
+
+function get_double_array() {
+ var a = new Array(100000);
+ var i = 0;
+ while (!%HasFastDoubleElements(a)) {
+ a[i] = i;
+ i++;
+ }
+ assertTrue(%HasFastDoubleElements(a));
+ a.length = 1;
+ a[0] = 1.5;
+ a.length = 2;
+ a[1] = 2.5;
+ assertEquals(a[0], 1.5);
+ assertEquals(a[1], 2.5);
+ assertTrue(%HasFastDoubleElements(a));
+ return a;
+}
+
+var a = get_double_array();
--
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