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ChangeLog
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2010-12-13: Version 3.0.1
Added support for an experimental internationalization API as an
extension. This extension is disabled by default but can be enabled
when building V8. The ECMAScript internationalization strawman is
at http://wiki.ecmascript.org/doku.php?id=strawman:i18n_api.
Made RegExp character class parsing stricter. This mirrors a change
to RegExp parsing in WebKit.
Fixed a bug in Object.defineProperty when used to change attributes
of an existing property. It incorrectly set the property value to
undefined (issue 965).
Fixed several different compilation failures on various platforms
caused by the 3.0.0 release.
Optimized Math.pow so it can work on unboxed doubles.
Sped up quoting of JSON strings by removing one traversal of the
string.
2010-12-07: Version 3.0.0
Improved performance by (partially) addressing issue 957 on
IA-32. Still needs more work for the other architectures.
2010-11-29: Version 2.5.9
Fixed crashes during GC caused by partially initialize heap
objects.
Fixed bug in process sample that caused memory leaks.
Improved performance on ARM by implementing missing stubs and
inlining.
Improved heap profiler support.
Added separate seeding on Windows of the random number generator
used internally by the compiler (issue 936).
Exposed API for getting the name of the function used to construct
an object.
Fixed date parser to handle one and two digit millisecond
values (issue 944).
Fixed number parsing to disallow space between sign and
digits (issue 946).
2010-11-23: Version 2.5.8
Removed dependency on Gay's dtoa.
Improved heap profiler precision and speed.
Reduced overhead of callback invocations on ARM.
2010-11-18: Version 2.5.7
Fixed obscure evaluation order bug (issue 931).
Split the random number state between JavaScript and the private API.
Fixed performance bug causing GCs when generating stack traces on
code from very large scripts.
Fixed bug in parser that allowed (foo):42 as a labelled statement
(issue 918).
Provide more accurate results about used heap size via
GetHeapStatistics.
Allow build-time customization of the max semispace size.
Made String.prototype.split honor limit when separator is empty
(issue 929).
Added missing failure check after expecting an identifier in
preparser (Chromium issue 62639).
2010-11-10: Version 2.5.6
Added support for VFP rounding modes to the ARM simulator.
Fixed multiplication overflow bug (issue 927).
Added a limit for the amount of executable memory (issue 925).
2010-11-08: Version 2.5.5
Added more aggressive GC of external objects in near out-of-memory
situations.
Fixed a bug that gave the incorrect result for String.split called
on the empty string (issue 924).
2010-11-03: Version 2.5.4
Improved V8 VFPv3 runtime detection to address issue 914.
2010-11-01: Version 2.5.3
Fixed a bug that prevents constants from overwriting function values
in object literals (issue 907).
Fixed a bug with reporting of impossible nested calls of DOM functions
(issue http://crbug.com/60753).
2010-10-27: Version 2.5.2
Improved sampler resolution on Linux.
Allowed forcing the use of a simulator from the build script
independently of the host architecture.
Fixed FreeBSD port (Issue 912).
Made windows-tick-processor respect D8_PATH.
Implemented --noinline-new flag fully on IA32, X64 and ARM platforms.
2010-10-20: Version 2.5.1
Fixed bug causing spurious out of memory exceptions
(issue http://crbug.com/54580).
Fixed compilation error on Solaris platform (issue 901).
Fixed error in strtod (string to floating point number conversion)
due to glibc's use of 80-bit floats in the FPU on 32-bit linux.
Adjusted randomized allocations of executable memory to have 64k
granularity (issue http://crbug.com/56036).
Supported profiling using kernel perf_events on linux. Added ll_prof
script to tools and --ll-prof flag to V8.
2010-10-18: Version 2.5.0
Fixed bug in cache handling of lastIndex on global regexps
(issue http://crbug.com/58740).
Added USE_SIMULATOR macro that explicitly indicates that we wish to use
the simulator as the execution engine (by Mark Lam <mark.lam@palm.com>
from Hewlett-Packard Development Company, LP).
Fixed compilation error on ARM with gcc 4.4 (issue 894).
2010-10-13: Version 2.4.9
Fixed a bug in the handling of conditional expressions in test
contexts in compiler for top-level code.
Added "//@ sourceURL" information to the StackTrace API.
Exposed RegExp construction through the API.
2010-10-04: Version 2.4.8
Fixed a bug in ResumeProfilerEx causing it to not always write out the
whole snapshot (issue 868).
Performance improvements on all platforms.
2010-09-30: Version 2.4.7
Changed the command-line flag --max-new-space-size to be in kB and the
flag --max-old-space-size to be in MB (previously they were in bytes).
Added Debug::CancelDebugBreak to the debugger API.
Fixed a bug in getters for negative numeric property names
(https://bugs.webkit.org/show_bug.cgi?id=46689).
Performance improvements on all platforms.
2010-09-27: Version 2.4.6
Fixed assertion failure related to copy-on-write arrays (issue 876).
Fixed build failure of 64-bit V8 on Windows.
Fixed a bug in RegExp (issue http://crbug.com/52801).
Improved the profiler's coverage to cover more functions (issue 858).
Fixed error in shift operators on 64-bit V8
(issue http://crbug.com/54521).
2010-09-22: Version 2.4.5
Changed the RegExp benchmark to exercise the regexp engine on different
inputs by scrambling the input strings.
Fixed a bug in keyed loads on strings.
Fixed a bug with loading global function prototypes.
Fixed a bug with profiling RegExp calls (issue http://crbug.com/55999).
Performance improvements on all platforms.
2010-09-15: Version 2.4.4
Fixed bug with hangs on very large sparse arrays.
Now tries harder to free up memory when running out of space.
Added heap snapshots to JSON format to API.
Recalibrated benchmarks.
2010-09-13: Version 2.4.3
Made Date.parse properly handle TZ offsets (issue 857).
Performance improvements on all platforms.
2010-09-08: Version 2.4.2
Fixed GC crash bug.
Fixed stack corruption bug.
Fixed compilation for newer C++ compilers that found Operand(0)
ambiguous.
2010-09-06: Version 2.4.1
Added the ability for an embedding application to receive a callback
when V8 allocates (V8::AddMemoryAllocationCallback) or deallocates
(V8::RemoveMemoryAllocationCallback) from the OS.
Fixed several JSON bugs (including issue 855).
Fixed memory overrun crash bug triggered during V8's tick-based
profiling.
Performance improvements on all platforms.
2010-09-01: Version 2.4.0
Fixed bug in Object.freeze and Object.seal when Array.prototype or
Object.prototype are changed (issue 842).
Updated Array.splice to follow Safari and Firefox when called
with zero arguments.
Fixed a missing live register when breaking at keyed loads on ARM.
Performance improvements on all platforms.
2010-08-25: Version 2.3.11
Fixed bug in RegExp related to copy-on-write arrays.
Refactored tools/test.py script, including the introduction of
VARIANT_FLAGS that allows specification of sets of flags with which
all tests should be run.
Fixed a bug in the handling of debug breaks in CallIC.
Performance improvements on all platforms.
2010-08-23: Version 2.3.10
Fixed bug in bitops on ARM.
Build fixes for unusual compilers.
Track high water mark for RWX memory.
Performance improvements on all platforms.
2010-08-18: Version 2.3.9
Fixed compilation for ARMv4 on OpenBSD/FreeBSD.
Removed specialized handling of GCC 4.4 (issue 830).
Fixed DST cache to take into account the suspension of DST in
Egypt during the 2010 Ramadan (issue http://crbug.com/51855).
Performance improvements on all platforms.
2010-08-16: Version 2.3.8
Fixed build with strict aliasing on GCC 4.4 (issue 463).
Fixed issue with incorrect handling of custom valueOf methods on
string wrappers (issue 760).
Fixed compilation for ARMv4 (issue 590).
Improved performance.
2010-08-11: Version 2.3.7
Reduced size of heap snapshots produced by heap profiler (issue 783).
Introduced v8::Value::IsRegExp method.
Fixed CPU profiler crash in start / stop sequence when non-existent
name is passed (issue http://crbug.com/51594).
Introduced new indexed property query callbacks API (issue 816). This
API is guarded by USE_NEW_QUERY_CALLBACK define and is disabled
by default.
Removed support for object literal get/set with number/string
property name.
Fixed handling of JSObject::elements in CalculateNetworkSize
(issue 822).
Allowed compiling with strict aliasing enabled on GCC 4.4 (issue 463).
2010-08-09: Version 2.3.6
RegExp literals create a new object every time they are evaluated
(issue 704).
Object.seal and Object.freeze return the modified object (issue 809).
Fixed building using GCC 4.4.4.
2010-08-04: Version 2.3.5
Added support for ES5 property names. Object initialisers and
dot-notation property access now allows keywords. Also allowed
non-identifiers after "get" or "set" in an object initialiser.
Randomized the addresses of allocated executable memory on Windows.
2010-08-02: Version 2.3.4
Fixed problems in implementation of ES5 function.prototype.bind.
Fixed error when using apply with arguments object on ARM (issue 784).
Added setting of global flags to debugger protocol.
Fixed an error affecting cached results of sin and cos (issue 792).
Removed memory leak from a boundary case where V8 is not initialized.
Fixed issue where debugger could set breakpoints outside the body
of a function.
Fixed issue in debugger when using both live edit and step in features.
Added Number-letter (Nl) category to Unicode tables. These characters
can now be used in identifiers.
Fixed an assert failure on X64 (issue 806).
Performance improvements on all platforms.
2010-07-26: Version 2.3.3
Fixed error when building the d8 shell in a fresh checkout.
Implemented Function.prototype.bind (ES5 15.3.4.5).
Fixed an error in inlined stores on ia32.
Fixed an error when setting a breakpoint at the end of a function
that does not end with a newline character.
Performance improvements on all platforms.
2010-07-21: Version 2.3.2
Fixed compiler warnings when building with LLVM.
Fixed a bug with for-in applied to strings (issue 785).
Performance improvements on all platforms.
2010-07-19: Version 2.3.1
Fixed compilation and linking with V8_INTERPRETED_REGEXP flag.
Fixed bug related to code flushing while compiling a lazy
compilable function (issue http://crbug.com/49099).
Performance improvements on all platforms.
2010-07-15: Version 2.3.0
Added ES5 Object.seal and Object.isSealed.
Added debugger API for scheduling debugger commands from a
separate thread.
2010-07-14: Version 2.2.24
Added API for capturing stack traces for uncaught exceptions.
Fixed crash bug when preparsing from a non-external V8 string
(issue 775).
Fixed JSON.parse bug causing input not to be converted to string
(issue 764).
Added ES5 Object.freeze and Object.isFrozen.
Performance improvements on all platforms.
2010-07-07: Version 2.2.23
API change: Convert Unicode code points outside the basic multilingual
plane to the replacement character. Previous behavior was to silently
truncate the value to 16 bits.
Fixed crash: handle all flat string types in regexp replace.
Prevent invalid pre-parsing data passed in through the API from
crashing V8.
Performance improvements on all platforms.
2010-07-05: Version 2.2.22
Added ES5 Object.isExtensible and Object.preventExtensions.
Enabled building V8 as a DLL.
Fixed a bug in date code where -0 was not interpreted as 0
(issue 736).
Performance improvements on all platforms.
2010-06-30: Version 2.2.21
Fixed bug in externalizing some ASCII strings (Chromium issue 47824).
Updated JSON.stringify to floor the space parameter (issue 753).
Updated the Mozilla test expectations to the newest version.
Updated the ES5 Conformance Test expectations to the latest version.
Updated the V8 benchmark suite.
Provide actual breakpoints locations in response to setBreakpoint
and listBreakpoints requests.
2010-06-28: Version 2.2.20
Fixed bug with for-in on x64 platform (issue 748).
Fixed crash bug on x64 platform (issue 756).
Fixed bug in Object.getOwnPropertyNames. (chromium issue 41243).
Fixed a bug on ARM that caused the result of 1 << x to be
miscalculated for some inputs.
Performance improvements on all platforms.
2010-06-23: Version 2.2.19
Fixed bug that causes the build to break when profillingsupport=off
(issue 738).
Added expose-externalize-string flag for testing extensions.
Resolve linker issues with using V8 as a DLL causing a number of
problems with unresolved symbols.
Fixed build failure for cctests when ENABLE_DEBUGGER_SUPPORT is not
defined.
Performance improvements on all platforms.
2010-06-16: Version 2.2.18
Added API functions to retrieve information on indexed properties
managed by the embedding layer. Fixes bug 737.
Made ES5 Object.defineProperty support array elements. Fixes bug 619.
Added heap profiling to the API.
Removed old named property query from the API.
Incremental performance improvements.
2010-06-14: Version 2.2.17
Improved debugger support for stepping out of functions.
Incremental performance improvements.
2010-06-09: Version 2.2.16
Removed the SetExternalStringDiposeCallback API. Changed the
disposal of external string resources to call a virtual Dispose
method on the resource.
Added support for more precise break points when debugging and
stepping.
Memory usage improvements on all platforms.
2010-06-07: Version 2.2.15
Added an API to control the disposal of external string resources.
Added missing initialization of a couple of variables which makes
some compilers complaint when compiling with -Werror.
Improved performance on all platforms.
2010-06-02: Version 2.2.14
Fixed a crash in code generated for String.charCodeAt.
Fixed a compilation issue with some GCC versions (issue 727).
Performance optimizations on x64 and ARM platforms.
2010-05-31: Version 2.2.13
Implemented Object.getOwnPropertyDescriptor for element indices and
strings (issue 599).
Fixed bug for windows 64 bit C calls from generated code.
Added new scons flag unalignedaccesses for arm builds.
Performance improvements on all platforms.
2010-05-26: Version 2.2.12
Allowed accessors to be defined on objects rather than just object
templates.
Changed the ScriptData API.
2010-05-21: Version 2.2.11
Fixed crash bug in liveedit on 64 bit.
Use 'full compiler' when debugging is active. This should increase
the density of possible break points, making single step more fine
grained. This will only take effect for functions compiled after
debugging has been started, so recompilation of all functions is
required to get the full effect. IA32 and x64 only for now.
Misc. fixes to the Solaris build.
Added new flags --print-cumulative-gc-stat and --trace-gc-nvp.
Added filtering of CPU profiles by security context.
Fixed crash bug on ARM when running without VFP2 or VFP3.
Incremental performance improvements in all backends.
2010-05-17: Version 2.2.10
Performance improvements in the x64 and ARM backends.
2010-05-10: Version 2.2.9
Allowed Object.create to be called with a function (issue 697).
Fixed bug with Date.parse returning a non-NaN value when called on a
non date string (issue 696).
Allowed unaligned memory accesses on ARM targets that support it (by
Subrato K De of CodeAurora <subratokde@codeaurora.org>).
C++ API for retrieving JavaScript stack trace information.
2010-05-05: Version 2.2.8
Performance improvements in the x64 and ARM backends.
2010-05-03: Version 2.2.7
Added support for ES5 date time string format to Date.parse.
Performance improvements in the x64 backend.
2010-04-28: Version 2.2.6
Added "amd64" as recognized architecture in scons build script
(by Ryan Dahl <coldredlemur@gmail.com>).
Fixed bug in String search and replace with very simple RegExps.
Fixed bug in RegExp containing "\b^".
Performance improvements on all platforms.
2010-04-26: Version 2.2.5
Various performance improvements (especially for ARM and x64)
Fixed bug in CPU profiling (http://crbug.com/42137)
Fixed a bug with the natives cache.
Fixed two bugs in the ARM code generator that can cause
wrong calculations.
Fixed a bug that may cause a wrong result for shift operations.
2010-04-21: Version 2.2.4
Fixed warnings on arm on newer GCC versions.
Fixed a number of minor bugs.
Performance improvements on all platforms.
2010-04-14: Version 2.2.3
Added stack command and mem command to ARM simulator debugger.
Fixed scons snapshot and ARM build, and Windows X64 build issues.
Performance improvements on all platforms.
2010-04-12: Version 2.2.2
Introduced new profiler API.
Fixed random number generator to produce full 32 random bits.
2010-04-06: Version 2.2.1
Debugger improvements.
Fixed minor bugs.
2010-03-29: Version 2.2.0
Fixed a few minor bugs.
Performance improvements for string operations.
2010-03-26: Version 2.1.10
Fixed scons build issues.
Fixed a couple of minor bugs.
2010-03-25: Version 2.1.9
Added API support for reattaching a global object to a context.
Extended debugger API with access to the internal debugger context.
Fixed Chromium crashes (issues http://crbug.com/39128 and
http://crbug.com/39160)
2010-03-24: Version 2.1.8
Added fine-grained garbage collection callbacks to the API.
Performance improvements on all platforms.
2010-03-22: Version 2.1.7
Fixed issue 650.
Fixed a bug where __proto__ was sometimes enumerated (issue 646).
Performance improvements for arithmetic operations.
Performance improvements for string operations.
Print script name and line number information in stack trace.
2010-03-17: Version 2.1.6
Performance improvements for arithmetic operations.
Performance improvements for string operations.
2010-03-10: Version 2.1.4
Fixed code cache lookup for keyed IC's (issue http://crbug.com/37853).
Performance improvements on all platforms.
2010-03-10: Version 2.1.3
Added API method for context-disposal notifications.
Added API method for accessing elements by integer index.
Added missing implementation of Uint32::Value and Value::IsUint32
API methods.
Added IsExecutionTerminating API method.
Disabled strict aliasing for GCC 4.4.
Fixed string-concatenation bug (issue 636).
Performance improvements on all platforms.
2010-02-23: Version 2.1.2
Fixed a crash bug caused by wrong assert.
Fixed a bug with register names on 64-bit V8 (issue 615).
Performance improvements on all platforms.
2010-02-19: Version 2.1.1
[ES5] Implemented Object.defineProperty.
Improved profiler support.
Added SetPrototype method in the public V8 API.
Added GetScriptOrigin and GetScriptLineNumber methods to Function
objects in the API.
Performance improvements on all platforms.
2010-02-03: Version 2.1.0
Values are now always wrapped in objects when used as a receiver.
(issue 223).
[ES5] Implemented Object.getOwnPropertyNames.
[ES5] Restrict JSON.parse to only accept strings that conforms to the
JSON grammar.
Improvement of debugger agent (issue 549 and 554).
Fixed problem with skipped stack frame in profiles (issue 553).
Solaris support by Erich Ocean <erich.ocean@me.com> and Ryan Dahl
<ry@tinyclouds.org>.
Fixed a bug that Math.round() returns incorrect results for huge
integers.
Fixed enumeration order for objects created from some constructor
functions (isue http://crbug.com/3867).
Fixed arithmetic on some integer constants (issue 580).
Numerous performance improvements including porting of previous IA-32
optimizations to x64 and ARM architectures.
2010-01-14: Version 2.0.6
Added ES5 Object.getPrototypeOf, GetOwnPropertyDescriptor,
GetOwnProperty, FromPropertyDescriptor.
Fixed Mac x64 build errors.
Improved performance of some math and string operations.
Improved performance of some regexp operations.
Improved performance of context creation.
Improved performance of hash tables.
2009-12-18: Version 2.0.5
Extended to upper limit of map space to allow for 7 times as many map
to be allocated (issue 524).
Improved performance of code using closures.
Improved performance of some binary operations involving doubles.
2009-12-16: Version 2.0.4
Added ECMAScript 5 Object.create.
Improved performance of Math.max and Math.min.
Optimized adding of strings on 64-bit platforms.
Improved handling of external strings by using a separate table
instead of weak handles. This improves garbage collection
performance and uses less memory.
Changed code generation for object and array literals in toplevel
code to be more compact by doing more work in the runtime.
Fixed a crash bug triggered when garbage collection happened during
generation of a callback load inline cache stub.
Fixed crash bug sometimes triggered when local variables shadowed
parameters in functions that used the arguments object.
2009-12-03: Version 2.0.3
Optimized handling and adding of strings, for-in and Array.join.
Heap serialization is now non-destructive.
Improved profiler support with information on time spend in C++
callbacks registered through the API.
Added commands to the debugger protocol for starting/stopping
profiling.
Enabled the non-optimizing compiler for top-level code.
Changed the API to only allow strings to be set as data objects on
Contexts and scripts to avoid potentially keeping global objects
around for too long (issue 528).
OpenBSD support patch by Peter Valchev <pvalchev@gmail.com>.
Fixed bugs.
2009-11-24: Version 2.0.2
Improved profiler support.
Fixed bug that broke compilation of d8 with readline support.
2009-11-20: Version 2.0.1
Fixed crash bug in String.prototype.replace.
Reverted a change which caused Chromium interactive ui test
failures.
2009-11-18: Version 2.0.0
Added support for VFP on ARM.
Added TryCatch::ReThrow method to the API.
Reduced the size of snapshots and improved the snapshot load time.
Improved heap profiler support.
64-bit version now supported on Windows.
Fixed a number of debugger issues.
Fixed bugs.
2009-10-29: Version 1.3.18
Reverted a change which caused crashes in RegExp replace.
Reverted a change which caused Chromium ui_tests failure.
2009-10-28: Version 1.3.17
Added API method to get simple heap statistics.
Improved heap profiler support.
Fixed the implementation of the resource constraint API so it
works when using snapshots.
Fixed a number of issues in the Windows 64-bit version.
Optimized calls to API getters.
Added valgrind notification on code modification to the 64-bit version.
Fixed issue where we logged shared library addresses on Windows at
startup and never used them.
2009-10-16: Version 1.3.16
X64: Convert smis to holding 32 bits of payload.
Introduced v8::Integer::NewFromUnsigned method.
Added missing null check in Context::GetCurrent.
Added trim, trimLeft and trimRight methods to String
Patch by Jan de Mooij <jandemooij@gmail.com>
Implement ES5 Array.isArray
Patch by Jan de Mooij <jandemooij@gmail.com>
Skip access checks for hidden properties.
Added String::Concat(Handle<String> left, Handle<String> right) to the
V8 API.
Fixed GYP-based builds of V8.
2009-10-07: Version 1.3.15
Expanded the maximum size of the code space to 512MB for 64-bit mode.
Fixed a crash bug happening when starting profiling (issue
http://crbug.com/23768).
2009-10-07: Version 1.3.14
Added GetRealNamedProperty to the API to lookup real properties
located on the object or in the prototype chain skipping any
interceptors.
Fixed the stack limits setting API to work correctly with threads. The
stack limit now needs to be set to each thread thich is used with V8.
Removed the high-priority flag from IdleNotification()
Ensure V8 is initialized before locking and unlocking threads.
Implemented a new JavaScript minifier for compressing the source of