NEWS

"Austin" 15-Jan-2014
 - [asio] Introduce ConditionWaitHandle
 - [hack] `hh_server --version` should not require a root
 - [hack] Log exceptions thrown in the master process.
 - [hack] Enable unused var warnings under typing/
 - [hh] typechecker: unbound name errors in partial/decl mode
 - [hack] Disallow trailing comma in used trait list
 - [hack] Have coverage / coloring use a hook
 - [hack] Create lock file if it doesn't exist
 - Fix std::terminate when debugger is not attached during unwind
 - [hack] Make `trait ... extends ...` into a parse error
 - [hack] Make multiple inheritance a parse error
 - [hh] typechecker: support Enum in xhp attribute declarations
 - [hack] Raise type errors on undefined static polymorphism lookups.
 - Fix realpath lookup
 - [hack] Let any user write to the saved state dir.
 - [hack] Don't have an optional param that's an option type
 - RequestInitDocument   404  friendly reminder
 - Implement Phar::running()
 - Make Redis utility methods public
 - Contiguous Heap Prototype
 - [hh_format] Don't add trailing commas in used trait lists
 - [hh_format] Don't add trailing commas in template parameter lists
 - [hh_format] Fix bug with hh_format --diff duplicating some lines.
 - [hh_format] Don't destroy whitespace in files with "**/" in comments
 - fix for iconv_mime_decode_headers function skipping headers
 - Add CPU option for JIT (EvalJitCPU). Defaults to 'native'.
 - Limit glob flags to only ones supported by php
 - make recursion limit for unserialize
 - Allow trailing commas in short-lamba expressions
 - Fix some leaks in new_socket_connect
 - fixed decoding utf8 strings so they correctly return '?' on invalid sequences
 - Actually get the realpath first thing when searching for a file.
 - Faster UnitCache
 - Simple speedup for is_dir
 - [hh] typechecker: demand consistent casing for primitive typehints
 - Support timestamp begins and ends for getTransitions()
 - Add global value numbering pass
 - Support \u escape sequences in double-quoted strings
 - ResourceLimit.SerializationSizeLimit can be overwriten from the vhost config
 - Check Eval.JitAMaxUsage when deciding whether to start profiling a function
 - Allow hex in mb_encode_numericentity
 - [hhvm] Work around leak in boost flat_set
 - Add stream_await() for async stream "blocking"
 - [typechecker] Add support for reading XHP attributes via "->:"
 - Modify rpoSortCfg to reduce memory usage in refcount-opts
 - Fix #4380, making get code and get message final
 - Add PHP_INT_MIN
 - Disable PGO for pseudo-mains
 - Mock date/time functions in Isolation.php
 - Fix error_get_last() not cleared when error handle function entered
 - [hhvm] RFC: Native Property Handlers
 - [hack] Define proper constants for CURLOPT and friends
 - Make newlines in http headers a fatal error.
 - Add Hack typing to array_keys
 - Use a custom implementation of strtoll for unserialize
 - [hack] control whether unseen <?php code is assumed via .hhconfig

Z* 18-Dec-2014
 - Converted objprof extension to use heap parsing

"Yelawolf" 4-Dec-2014
 - Fix comparison of overflowing strings
 - Fix potential memory corruption during ArrayData::set
 - Introduce util to restart current process
 - Share variable environment in eval'd assert
 - [Find] Only escape spaces in paths for find
 - Don't ignore Eval.JitAHotSize
 - Fix checkCfg's defined-tmp checks to be aware of edge-defined tmps
 - Fix bugs relating to edges in IRInstruction::become
 - Fix insertPhis calls to IRUnit::replace()
 - Use sha1sum for the repo-schema
 - [hh] typechecker: add constants to hh_client --show
 - [hack] Dump typedef info in `hh_client --show`
 - Make BigNode parsable, extend HeapIter to visit BigNodes.
 - Allow static invocation of DOMDocument::load* methods
 - Allow "array" with type args to be used in XHP attribute declarations
 - HTMLEncode strings in wddx_serialize_value()
 - [hack] Make dependency on lz4 optional for OSS build.
 - [hack] Have hh_server take the list of files to recheck as relative paths
 - [hack] Docblock parser for AT
 - Add version number to imagick extension
 - Support Authorization header in apache_request_headers()
 - [hack][build] Add needs_rerun hook for XController build step
 - Fix call to fetchObject without class name
 - Add possibility to create a DateTime object with timezone
 - DateTimeImmutable::createFromFormat returns false on failure
 - [hh] typechecker add PREG_* constants to hhi
 - Raise warning when put_contents on non-regular file with exclusive lock.
 - Use uncounted strings to cache non-static regexes
 - Use specializeExact whenever we know AttrNoOverride from whole program analysis
 - Fix some not-type-safe LdRef code generated in a situation with SetOpL
 - Split inner ref type checks into a separate instruction from LdRef
 - Add support for stream wrapper in include_path.
 - cmake option to enable avx2 instruction support
 - Add missing default to PharData::decompress()
 - [hack] Add lz4 compression when saving server state.
 - Fix leak in tvCoerce*
 - Trie Search - optimizations for JS
 - Don't throw an exception on unknown IP address for OSS
 - [hh] parity: match php 5.6 in treatment of array_fill with num = 0
 - Make ob_start function signature PHP 5.6 compatible
 - Fix issues with private properties and apc
 - Implement remaining straightforward vasm ops in llvm backend
 - [hack] Type strlen's return value.
 - [hack] add additional iterator interfaces
 - Improve segaddr fixing for 32-bit destructors
 - Fix parent::__cOnStRuCt and similar with PHP4 constructors
 - Make stats.json on the admin server return valid json
 - [hack] Simplify coverage JSON output, and add non-JSON output option.
 - Remove kernel version assertions
 - [hack] Fix bad escaping of directory names
 - [hack] Add some hhi constants for pcntl.
 - Fix problems in getCurrentPropertyOffset relating to m_ni.inputs
 - Fix CSE to be aware of where SSATmps are known to be defined
 - Add an analysis module for functions that query information about the IR
 - Don't JIT functions that use $php_errormsg or $http_response_code
 - Fix default SOAP HTTP client
 - [hack] Member access is `->` followed by lvar, not word
 - Fix comparison between doubles and hex numeric strings
 - Implement a bunch more vasm instructions in llvm backend
 - Enable ASAN for smart allocator
 - Record the start time for every request
 - Fix parsing of binary literals denoted with a capital '0B'
 - Fix Symfony's it's not safe to rely on system timezone setting errors
 - Allow non-static expressions in function parameter defaults
 - Fix a bug in Index::lookup_constraint
 - [hack] Add logging to server_options_cmd.
 - Fix optional 'errorcode' parameter is not set up properly
 - Fix PHP primitive default parameter type check
 - Weaken assert in FileUtil::canonicalize
 - [hack] Error when using "shape" as a type
 - Fix getOldestStartTime
 - Add zlib.output_compression ini option
 - Add missing argument to DOMXPath::{query,execute}()
 - htmlentities() should output valid ISO-8859-1 characeters to appropriate entities
 - Remove bad assert from BaseVector::data()
 - Cleanup sock and pid files on graceful exit from FastCGI
 - [hack] Add script for determining server startup options
 - [hack] Record init time in log output.
 - Fix some bugs in intersecting specialized types
 - [hack] Fix duplicate unbound name errors
 - Update OCaml to 4.02.1
 - [hhvm] Add per kind ArrayFunc counters for ArrayTracer
 - Fix use-after-free in the access logs
 - Wait for clean shutdown on SIGHUP
 - [hhi] add at() to MysqlRow in hhi file
 - [memoize] Go back to individual cache props for statics
 - Break regions after FCall & friends when using LLVM
 - Remove support for magic quotes (also removed in PHP 5.4)
 - qlzcompress is not available everywhere, and there's no support for it in OSS
 - Change the Profiler constructor to not necessarily force CPU affinity.
 - Add getTypeText to ReflectionParameter
 - Remove trailing junk from IP addresses for sockets
 - Preserve index of sockets passed into/out-of socket_select()
 - Fix lchown when no user found
 - [hh] typechecker: split function bodies into named and unnamed
 - [hack] fix error with capturing locals for a foreach using a ref
 - guess root from supplied filename, where that makes sense
 - Show a nice error when an invalid argument is passed to hphp -t
 - Expose Imagick::getImageMimeType to userland
 - SplFixedArray::FromArray() throws InvalidArgumentException not Exception
 - Make default_socket_timeout match PHP 5.x
 - VerifyRetTypeC optimizations for repo-mode
 - Turn off refcount opts by default when HHIRBytecodeControlFlow is on
 - Make profiled packed array gets not rejoin the main line
 - Side exit on surprise flags for backward jumps
 - Print edges with colors in IR dot graphs; make dotBodies usable
 - Fix region-method support for loops
 - Correct the return type of BaseG; fix some missing renames of Mem -> Memb
 - Adopt PHP7's looser handling of return values in user session handler
 - Honor the Redis timeout
 - Fix mysqli_options. Stop asserting.
 - Fix some bugs in hhbbc support for http_response_code, php_errormsg
 - Introduce immediately executed async lambdas
 - Allow nested namespaces with sane behavior
 - Updated win32-cygwin patch Fixes Issue #4062
 - [hh] typechecker: ReflectionClass hhi fixup
 - [hack] Add hh_server --version
 - Fix a few memory management issues in DOMDocument
 - Prevent m_nextKI from going negative in MixedArray
 - [hh] typechecker: declaration location in extend_final error
 - [hack] Enable .hhconfig to control hh_server flags
 - Respect status codes from `Status:` header in addition to `HTTP/` header
 - Fix number_format() to deal with very large precisions/very large numbers
 - Fix closure use var reflection for referenced vars
 - Support self parameter typehint
 - [h2tp] modify build to support h2tp
 - [hh] hh_format: understand async lambdas
 - [hack] added support for abstract class constants

"Xzibit" 20-Nov-2014
 - Fix readline request locals
 - Don't leak HashContexts
 - Fix a race freeing an APCHandle
 - Don't clean up memory in AdminRequestHandler::abortRequest
 - Fix setup/teardown for requests handled by WarmupRequestHandler
 - Extend IR type system for more information about pointers
 - Use proxygen as a git submodule
 - Version of memcpy-x64 optimized for the tail end of 7,6,5,4 bytes in an N byte copy
 - Eliminate default cases in DataType switches
 - Match PHP5 backquote processing
 - Add overflow info to is_numeric_string
 - Add support for pre-built branches to benchy
 - Allow calling closures inline
 - Allow systemlib function declarations to use reserved words for function names
 - Add HH\{int,float,bool} typehints to PHP
 - Deep initialization for constant properties
 - Enforce void return on native class constructors/destructors
 - Replace NEWOBJ with newobj<T> and newres<T> functions
 - Change default FCGI socket permissions
 - Support openssl replacements which don't export RANG_egd()
 - Fix use-after-free in TimeZone
 - Support GCC/LLVM stack-smashing protection
 - Make sure Type::Bottom is a subtype of everything
 - Fix hphpd crash when printing systemlib classes
 - Convert file extension to HNI
 - Convert DOMDocument extension to HNI
 - Convert POSIX extension to HNI
 - Convert array_multisort to HNI
 - Add fribidi extension for HHVM
 - Mechanism for enabling request-local heap profiling
 - Make prediction opts deal with arbitrary load/check instructions
 - Add JSON output support to benchy
 - HHIR pass to do dead store elimination on frame locals
 - Adjust single parameter warnings for min()/max()
 - Make AlwaysLogUnhandledExceptions=off and CallUserHandlerOnFatals=EnableHipHopSyntax
 - Always use RuntimeOption::SourceRoot to resolve repo-auth lookups
 - Refactor debugger tests
 - Fix parser to allow "type" and "newtype" to be used as typevars
 - Convert system/idl/function to HNI
 - Remove type annotations for array_sum and array_product
 - Don't populate the litstr-to-id map in RepoAuthoritative mode
 - Move m_lineTable to a side table
 - Only try to autoload classes with valid names
 - Proper PDO connection errors
 - Move hfsort linker script tool to OSS
 - Move slow 'quick' tests to 'slow'
 - Add option to make inconv actually match the docs
 - Convert socket extension to HNI
 - Convert stream extension to HNI
 - Fix UserFile::access behavior to match PHP5
 - Fix for wrong PATH_INFO and PATH_TRANSLATED (maybe)
 - Move generated .h and .cpp to unique dir
 - Fix for phat:// stream wrapper with no stub
 - JSON encode closures as empty objects for PHP compat
 - Disable parameter typehints for builtins to match PHP5
 - Convert PDO extension to HNI
 - Fix assert related to async return typehints
 - Allow collections in array_sum() and array_product()
 - Use the time in default xdebug output file
 - Allow vxls to allocate vmsp during traces
 - Only initialize sweepables on new threads
 - Load Offset->line number mappings on demand
 - Fix SOAP memory leak
 - Add OSS support for benchy

"Will.i.am" 13-Nov-2014
 - Add benchy.py for benchmarking HHVM
 - Tune and enable PGO for all functions
 - Generate HHIR opcode table by extracting lines from ir.specification
 - Convert a few more extensions to HNI
 - Limit the maximum number of bytecode instructions in a region
 - Improvements to <<__Memoize>>

"Vanilla Ice" 27-Oct-2014
 - Fix logging
 - An async method's return annotation (if there is one) must be "Awaitable"
 - Fix a bug in how __Memoize sets up FPI regions
 - Fix issues with shutdown/postsend functions
 - Fix is_callable for interface and abstract methods
 - Added support for ReflectionFunction::getClosureThis()
 - Add option to run perf to hhvm_wrapper
 - Use a global cache for timezone info
 - Implement readline_info()
 - Fix NumberFormatter::format for string values
 - Corrected socket connect for IPv6 hosts
 - [hack] Fix parsing of postfix operators.
 - Region selector improvements
 - Disallow <<__Memoize>> on interfaces
 - Convert APC to HNI
 - Align recoverable fatal error's message with PHP
 - [hack] Make hhi for some builtin constants.
 - HHBBC improvements (enums, etc.)
 - Properly shutdown debugger threads on exit
 - [hack] support for 'abstract final' classes
 - Convert string to HNI
 - Fix SOAP extension type encoding
 - make test runner not puke when run with xargs
 - [hack] reflection support for first-class enums
 - Make `yield;` a valid statement

"Ultramagnetic" 9-Oct-2014
 - Optimize strtr
 - Closure::bind support
 - Cleanup/shrink various runtime data structures
 - Various jit performance optimizations
 - Fix various debugger crashes
 - Better handling of memory limits
 - Hack: System user attributes will be prefixed with __, notably <<Override>> renamed to <<__Override>>
 - Hack: Support for 'abstract final' non-instantiable non-inheritable "utility" classes

"T-Pain" 25-Sep-2014
 - Use vasm virtual registers in x64 backend, transition fully to vasm-xls
 - 'arraykey' scalar typehint that accepts both ints and strings
 - Add OSS benchmarking suite
 - Fix PDO::bindColumn
 - [resumable] Set resumed flag before suspending VarEnv
 - Objprof for HHVM (Approx. instance counter)
 - Make RUSAGE_THREAD available to getrusage PHP function
 - clean up /tmp/test-run- files
 - VASM register-coalescing via hinting
 - Be more conservative about HNI types when there are InterceptableFunctions
 - Add runtime support for null-safe method call operator "?->"
 - Add sanity test system to OSS benchmarker
 - Fix double deallocation of object in zend conversion of object to string
 - [hhvm|memoize] Makes <<__Memoize>> work with arbitrary args
 - Use raw troff encoding for official HHVM man page
 - Add --php options to HHVM man page
 - Fix GMP tests/crashes
 - Implement posix_errno
 - Xdebug remote debugging compatibility and bug fixes
 - Add options parameter to DOMDocument::load/loadHTML()
 - Add support for GNU tar symlinks to PharData
 - Add max_file_uploads support
 - Improve process error checking in perf runner
 - posix_getgrgid()['members'] should be empty array if no users found
 - Convert from jemalloc's obsolete *allocm() to *allocx()
 - Use EqX instead of Eq for Obj/Num comparisons.
 - make class closure consist with PHP
 - Fix guard relaxation to work with bytecode control flow
 - Allow vm-stack flushing in rpc threads
 - stop killing LightProcesses while writing out stacktrace.log
 - Get hhvm compiling with clang-3.5
 - Update .hhi files for ConstSet, Set, and ImmSet
 - Force the linker to keep symbols in lowmem on MacOSX
 - Make guard relaxation work with unreachable code
 - Add minimal hdf support to test runner
 - Analyze/optimize pseudomains in hhbbc
 - [hhvm|memoize] Fix segfault on certain memoized functions
 - Support mappy ini configuration
 - Xdebug cleanup and trivial features
 - Abort the server if a request gets stuck
 - Added support for Closure::bind()

"Snoop Dogg" 11-Sep-2014
 - VASM phase 1: emit vasm instructions, with existing register allocation
 - More xdebug support
 - [hack] Implement async lambdas.
 - add process memory and code segment size to admin memory page
 - Overhauled xdebug remote debugging testing
 - Add a mechanism for building and testing a zend extension as a DSO.
 - Support fast object allocation path when Eval.EnableObjDestruct call is on
 - Static string table memory usage
 - Implement parallel repo preloading.
 - Add mcrypt constants to hhi
 - Move var_dump() to HNI, kill off variable.idl.json
 - JIT: Use std, boost, and folly instead of smart containers.
 - Hack: Support for variance (+/-) annotations on type-parameters
 - Implement APCIterator
 - Convert v?s?printf() to HNI using Variadics
 - Enable variadics for HNI functions/methods
 - Smooth a wrinkle in HHVM's safesort impl
 - Make Set implement KeyedIterable and support bracket syntax for reading
 - Covariance fixes

"RBX" 28-Aug-2014
 - Make MemExceeded flag sticky
 - Check for OOM during json decoding
 - Check surprise flags when unserializing arrays and objects
 - Limit curl timeout to remaining request timeout
 - Add variant of openssl_pkcs7_verify that ignores cert expiration
 - Numerous changes to support xdebug
 - Remove use of non-threadsafe strtok()
 - Numerous changes to normalize INI setting names
 - update to new sqlite
 - <<__Memoize>> support
 - Hack: Print backtrace when worker dies
 - Parser support for "varray(..)"
 - Introduce kVPackedKind for vector-like arrays
 - Move mailparse to HNI
 - VASM start phase 1; emit vasm for some instructions
 - Fix in headers defines for cygwin
 - [hack] Parser: Fix decl mode's confusion of type hints and xhp.
 - Create a unified stack for Xenon
 - Move debugger from IDL to HNI
 - Fix mcrypt_create_iv(..., MCRYPT_RAND) to auto-seed RNG
 - Fix information leak in hash_equals() implementation
 - don't statically link libgcc/libstdc++ by default on OSX
 - Adds ssdeep module to HHVM
 - added new raise_error family functions that skip the top frame of the backtrace.
 - Add initial support for -d outside of --php mode
 - Fix covariance for Const{Vector,Map,Set}, add tests
 - GMP cleanup/fixes
 - Implement SplDoublyLinkedList::add
 - Link against LLVM library if present.
 - Disallow multiple 'default:' blocks in a single switch
 - Introduce async function lambdas
 - Document the PHP profilers
 - Fix sample profiler output; make it more efficient
 - Properly shut down fastcgi worker threads when connection is closed
 - Delete SimpleProfiler
 - Create HHVM man page
 - Improved PHP compatibility in the reflection API.

"Queen Latifah" 14-Aug-2014
 - Implement RecursiveCallbackFilterIterator
 - cmake installations should no longer put files in hphp and now put them in hhvm
 - Fix error for (Recursive)CachingIterator::ctor's param 1
 - Force OOM check on large smart allocations
 - Support stream wrappers in XML parser extensions, add external entity loader
 - Fix LowPtr load in codegen
 - Fix race condition in DebuggerProxy start/stop
 - Log per request if oom or timeout triggered in dynostats
 - Break out hhvm request timeout / memout counters for psp vs non-psp
 - Support collections for third parameter of preg_replace() and friends
 - Added functions imagewebp and imagecreatefromwebp
 - Fix mb_convert_case when encoding set other than default
 - Added function imagepalettecopy to ext_gd
 - Remove reflection hacks for primitive typehints
 - Fixed tempnam() creates paths with '//'
 - Add LibGMP extension
 - Fix heap overflow in sql_regcase() for input >1GB
 - Add HHVM hookups for folly::Singleton
 - Fix isset on classes extending ArrayObject
 - Only track live objects that actually have destructors
 - Specify ssl cipher list for curl with OpenSSL only
 - Remove support for "service threads"
 - PDO MySQL's getCode() didn't match errorInfo
 - Run usercode before ending the request
 - Make DynamicExtensions work in ini
 - Provide backup utf8 sanitizer when UConverter is unavailable
 - Pass duplicate flag to SNI Initial Handler Callback
 - fb_intercept now accounts for variadic functions
 - Add variadic function to fb_intercept test
 - Implemented basic xdebug tracing
 - Rename snappy methods
 - Add sort_flags to ArrayObject::asort
 - Changed CRYPT_BLOWFISH to 1 because apparently it is available
 - Convert ext/mysql to HNI
 - Add log when memory usage reached the MaxRSS
 - Fix http headers parsing + Remove unused code + Fix indentation
 - Fixed error output for json_encode
 - Corrected the var_dump output for Exception class
 - Relax restrictions on the typing of class constant shape field names.
 - Fix file:// URL decoding in libxml functions and elsewhere

"Public Enemy" 31-July-2014
 - Interface requirements (similar to trait requirements) enforced
 - Initial support for PHP5.6 argument unpacking: f($x, $y, ...$args)
 - Hack: hhi files are embedded in the hh_server binary
 - removed trampolines and the Eval.JitTrampolines option
 - Hack: improved support for Generators, including async generators
 - Documentation of PHP-level profiling in doc/profiling.md
 - Cleanup of PHP-level profilers
 - Change default for Eval.EnableObjDestructCall to true
 - Bundle PCRE 8.32 with open-source HHVM, so we can use the JIT

"Outkast" 17-July-2014
  - PHP_VERSION is now 5.6
  - Introduce Dbl specific relational IR opcodes
  - Expose APC info to admin port
  - Improve Zend compatibility in the reflection API
  - Implement xdebug_call_class
  - Hack: first version of formatter
  - Convert ext/xsl to HNI
  - Hack: improve init time
  - Remove JIT::RuntimeType
  - Fix floating-point overflow for binary, octal and hex literals
  - Collections: Vector::addAllKeysOf
  - Hack can build on OSX now
  - Fix await/yield operator precedence
  - Fix various xcontroller issues
  - Enable HHIRBytecodeControlFlow by default
  - Various changes/fixes to WholeCFG region selector
  - Introduce async generators
  - Kill clock_settime
  - Fix Memcache::get($keys) when $keys is an array
  - Implement xdebug_call_function
  - Change order of wait handle processing from FIFO to LIFO
  - Add Redis::_serialize()

"Notorious B.I.G." 25-Jun-2014
 - Remove Translator::analyze (replaced by tracelet region selector)
 - Allow empty keys in hash_hmac() and hash_hmac_file()
 - Interface requirements supported in parser
 - Implement xdebug_{peak_,}memory_usage
 - Inline singleton-pattern functions
 - Cleanup in PhpFile and FileRepository
 - Fix mysqli_query return value for query without result
 - Implement xdebug_call_file
 - Add fastlz support to memcached extension
 - Fix ini_get to return false for non-supported settings
 - Fix PHP version constants
 - All numeric comparisons involving NAN, except != and !==, are now false.
 - Implement xdebug_call_line
 - Optimize ini_get
 - Remove dump-file-repo admin command
 - Fix stdclass promotion of static private properties
 - Remove unused locals in global dce (HHBBC)
 - Get mockery at 100%
 - Fix casting resource to object
 - Relocate code to arbitrary alignment
 - Always let the first character through for camelcase searching
 - Implement xdebug configuration options
 - Convert ext/memcache to HNI
 - Match php5's memcache getoption
 - ./configure --help now has all the options
 - mysqli: return false on non-selects
 - Don't include bt_handler or killpg in backtraces
 - Don't buffer overrun on bad DNS TXT records
 - Fixed property access to DOM and XMLReader classes
 - Add support for ParamCoerceModeFalse

"Mos Def" 11-Jun-2014
 - Turn on new tracelet region selector by default; analyze() is deprecated
 - Fix a bug in debugBacktrace with NativeImpl methods
 - Request local allocator now uses logarithmically spaced size classes
 - Improvements to JIT'd FCallBuiltin to cause fewer spills
 - Enable vtable-style dispatch on methods marked "abstract"
 - JIT several instructions that were being punted:  Unbox, File, Dir
 - Increase "hinted drop" time on write lease, improving JIT'd code layout
 - Implemented __toString functions in reflection classes
 - Several tc-print bug fixes
 - Some improvements in hhbbc arithmetic type inference
 - More service requests are "ephemeral", reducing wasted stubs space
 - HH\Vector now has a packed array internally, for O(1) conversions to array
 - current() and key() now support expressions that can't be taken by reference
 - Fix a long-standing but very rare race condition with Closure class names
 - gcc 4.8 is the new minimum to build
 - Various bug/compat fixes in Soap, SimpleXML, ArrayObject, DOMNode, mysqli
 - Add a scheme to extend support for efficient packed arrays w/ cap up to 2^32
 - Move vmfp, vmsp, and vmpc into RDS
 - Fix some hard-to-hit bugs in inlining relating to stack overflow checks
 - Faster int to double conversion when calling builtins from the JIT
 - Fix ReflectionParameter::getClass for scalar typehints
 - better tuning of the PGO 'hot function' threshold
 - performance improvements to calling native class methods
 - improve performance of async functions that exit via exception
 - several bug fixes in refcount optimization pass relating to async functions
 - More hhir-related docs in the hackers-guide
 - Initial support for relocating generated machine code
 - JIT optimizations for count()
 - Corrected the result of var_dump and print_r for ArrayObject
 - fix HH\autoload_set_paths with nested maps
 - make ReflectionClass serializable
 - ext/standard/output HNI conversion
 - allow usage of zend-qsort in user sorts with a runtime option

"LL Cool J" 28-May-2014
 - Over 200 other bug fixes (go lockdown!)
 - Every HDF setting is now available as INI
 - Cut session_id() size by 1/2
 - Added 'Z' format string for pack/unpack
 - We now build on clang
 - Fix pcre cache to not fatal when full
 - Implement $php_errormsg
 - Adding -n CLI option to hhvm php mode
 - Fix substitution of invalid UTF8 sequences in htmlspecialchars
 - FastCGI: Use SCRIPT_FILENAME as the PHP script to run
 - Can create DateTimeZone's from abbreviations
 - Put all fastcgi params into $_SERVER
 - Many DOM classes are now serializable
 - Define the xhp tokens
 - Many reflection changes for perf and compatibility
 - Default fastcgi to listen on 127.0.0.1
 - remove register_cleanup_function
 - Map: reserve()
 - Set: retain(), reserve(), addAllKeysOf()
 - {Set|ImmSet|Vector|ImmVector}::fromKeysOf()

"Kanye West"
  - Backport fix for CVE-2011-2202
  - Interfaces {Keyed}Container match arrays *and* collections, not iterables
  - Added ** and **= operators to HHVM and more compatibility fixes with PHP5.6
  - Fixes and improvements to collections
  - Replace json decoder with json-c library
  - Document VMRegAnchor and isVMFrame()
  - Improvements to array iterator code
  - Improvements to the type checker
  - Allow parser to be generated with bison 3
  - Improvements and speed up to reflection code

"Jay-Z" 9-May-2014
  - Make handling of code.hot overflows more robust
  - Catch server errors sooner
  - Fix segfault and infinite recursion in fileinfo extension
  - Resolve systemlib constants at compile time
  - Resume resumables natively
  - Import round() table optimizations from php-src
  - Delete bytecode Peephole optimizer
  - Remove most of annotation.cpp, and some other code gated on !UsedHHBBC
  - Create phis for locals
  - Fix free of "" in rfc1867PostHandler
  - Add firstValue(), firstKey(), lastValue(), lastKey() to collections
  - Add concat() to collections
  - Clarify Hack license
  - Add CakePHP3 to test runner
  - Better error when TC is full
  - Add hash_equals() from PHP 5.6

"Insane Poetry" 24-Apr-2014
  - Support for PHP 5.6 variadic ...$args syntax for func declarations
  - Open source HHMeasure, a simple and extensible microbenchmarking tool
  - Added a new time-based sampling profiler (Project Xenon)
  - Fix PCRE unicode handling
  - Convert Zend compatibility layer and various extensions to HNI
  - Encode execution mode (eager or resumed) into SrcKey
  - Merge eager and resumed parts of async functions
  - Rework various async / continuation bytecode instructions

"House of PHPain" 1-Apr-2014
  - Allow direct arg passing with up to 15 params (7 if at least one is a double)

"Ghostface Killah" 17-Mar-2014
  - Remove "HipHop" from error messages
  - Add __IsFoldable user attribute for const-foldable functions
  - Add __Native("NoFCallBuiltin") UA for builtins which need an actrec
  - Add support for testing different outputs in repo mode
  - Implement remaining functionality from intl extension
  - Implement XSL extension
  - Implement Stream Filters
  - Improve php.ini support and get ready to kill HDF files
  - Parse config files as ini files, unless filename contains '.hdf'
  - Various fixes to Redis, JSON, SPL, DateTime, MySQLi, and others
  - Remove C<T>Ref typedefs (use const T& now)
  - JIT default on in command line mode
  - gethostname() just returns what the syscall returns (Zend compat)
  - HHBBC turned on in the build for facebook.com

"Fifty Cent" 3-Mar-2014
  - Array parameter type constraints implicitly cast collections to arrays
  - Fix issues with feof and fwrite
  - Fix issues with sleep and inaccessible properties
  - Dump a jemalloc pprod dump when a request hits OOM
  - Make method_exists work with interface inheritance
  - Fix crash in preg_replace with /e
  - Support filename and content type in Curl uploads
  - MySQLi fixes
  - Handle relative paths in is_dir
  - Add string conversion for array_fill_keys
  - Implement various Imagick functionality
  - Implement CUROPT_PROGRESSFUNCTION
  - Implement PHP 5.6 __debugInfo() magic method
  - Raise warnings when return type annotations mismatch
  - Fix nested ArrayObject assignment
  - Switch many ini settings to thread-time binding
  - Clean up memory stat tracking
  - Immutable collections are now prefixed with Imm instead of Fixed/Frozen
  - Clean up type parameter for CheckType-related IR opcodes
  - Remove legacy linear-scan register allocator and Eval.HHIRXls option

"Eminem" 18-Feb-2014
  - reenabled jemalloc tcache flush for idle threads
  - array_combine now performs __toString conversion on objects in $keys
  - Allow streams in move_uploaded_file
  - Fix a bug double closing a UserFile
  - Warn when first arg to call_user_func is an object with no __invoke
  - kill userland hdf functions
  - Final method reports itself as final
  - Implement IntlCalendar
  - Disallow create_function in RepoAuthoritative mode
  - Case-insensitive check for Accept-Encoding: gzip

"Donald Glover" 3-Feb-2014
  - Support for "::class"
  - Enable FCallBuiltin for HNI functions
  - json_decode parity with PHP 5.4
  - Fix race condition with profiling vs. non-profiling functions prologues
  - Implement ini_get_all()
  - Begin conversion of runtime options to INI
  - Fix potential PGO-mode crash
  - Fixes and enhancement in IR printing
  - Vector and Set now supported by:
    array_{shift,unshift,fill_keys,reverse,flip,size,chunk}, min, and max
  - StableMap is now an alias for Map, which retains insertion order
  - Map moved to HH namespace
  - Fixes in XLS spilling of SIMD registers
  - Support SCRIPT_FILENAME in FastCGI
  - Implement stream_context_{get,set}_default
  - Support for Intel VTune Amplifier XE
  - Rewrite of SimpleXML
  - Several HNI conversions, and a helper script
  - Move Pair to HH namespace
  - Fix get_included_files ordering
  - Fix $_SERVER and $_ENV in FastCGI
  - Update timelib to php 5.5.8
  - Some dead code removal

"Coolio" 21-Jan-2014
  - Turn on Region JIT
  - FastCGI fixes, perf improvements
  - ext_zend_compat fixes
  - Turn on XLS Register Allocator by default
  - Fix server stats reporting
  - 'num' scalar typehint that accepts both ints and floats
  - fix support for typedef'd namespaces
  - don't swallow fatals when autoloading
  - Map collections learned the in-place retain() and retainWithKey()
  - rename Set::difference() to Set::removeAll()
  - Update Set to retain element insertion order
  - remove APC stats
  - Fixes for ARM mode
  - FrozenMap collection
  - Deprecated Vector|Set|Map::put() method removed
  - == between Frozen{Vector|Set|Map} and {Vector|Set|Map} now can return true

"Beastie Boys" 6-Jan-2014
  - Support lex-time binary constants (eg. 0b10111)
  - StreamWrappers now support rmdir, mkdir, rename and unlink
  - Miscellaneous PHP5 compatibility fixes
  - Default StatCache to off
  - Miscellaneous FastCGI fixes
  - Miscellaneous region compiler fixes
  - Map and StableMap collections use the same underlying implementation
  - Trait requirements enforced
  - hhprof performance improvements
  - Add array to string conversion notice
  - Add RaiseNotice IR opcode
  - Fix VirtualHost.<name>.Pattern matching
  - Fix various memory leaks (pdo_parse_params, Gen*WaitHandle)
  - Import a lot more Zend tests that used to crash or hang
  - Clean up base.h
  - XLS register allocation cleanup
  - Enable region compiler by default for JIT functions in ahot
  - Fatal on eval() in RepoAuthoritative mode
  - Enable LTO for HHVM
  - Fix a few SPL compatibility issues

"Appleseed" 23-Dec-2013
  - Fix issues with DOCUMENT_ROOT in fastcgi
  - Better type inference for collections and builtins in repo mode
  - Shorter syntax for lambda expressions w/ automatic captures
  - Parser support for trait require clauses
  - Move FrozenVector and Set to the HH namespace
  - Fix resource to array conversion
  - Fix a request local memory leak in foreach of apc arrays
  - Initial php_odbc API implementation
  - Implement PHP's hash_copy() function
  - Experimental tool: Memoization Opportunity Profiler
  - Various small parity/behavior fixes (in phar, proc_open, filter_var)
  - A Eval.DumpHhas=1 option to dump hhas for a php file
  - Better warnings in Set::toArray
  - Fix the behavior of foreach loops in finally blocks
  - chmod -x runtime/vm/jit/*.{cpp,h}
  - Changes to make hhvm build clean with clang-3.4
  - Fix array_product to not be bug-compatible with PHP 5.2
  - Change the Map datastructure---preserves order and does faster foreach
  - FrozenSet collection
  - Generate pid.map when we unmap text section, for the perf tool
  - Implemented GlobIterator
  - Implemented Reflection::export and Reflection::getModifierNames

"Tom Yum" 9-Dec-2013
  - support date.timezone in ini files
  - implement fileinfo
  - special comparisons for DateTime
  - delete unimplemented functions
  - support for the finally clause in try blocks

"Huarache" 26-Nov-2013
  - Linker re-ordering of hot functions
  - Huge pages for hot functions
  - Implement ZipArchive
  - preg_replace /e support
  - get_mem_usage() no longer can be negative
  - Userland file system support
  - Implement fileinfo extension
  - wordwrap() fixes
  - PDO::sqliteCreateFunction()
  - Implement NumberFormatter
  - Implement Locale
  - Implement DatePeriod
  - Many reflection fixes
  - Stub out PharData
  - A ton of performance fixes
  - A ton of open source framework fixes
  - FastCGI Server Support

"Garlic Alfredo" 11-Nov-2013
  - teach implode() about collections
  - fix ini parsing leak
  - Make array not an instanceof Traversable

"Burrito" 28-Oct-2013
  - Initial support for using FastCGI
  - Initial support for php.ini configuration files
  - Log when a nullable (e.g. ?int) is incorrect
  - Add support for collections to array_diff, array_diff_key, array_intersect,
    array_intersect_key
  - tc-print improvements and fixes
  - Several debugger fixes
  - More improvements to the experimental PHP extension compat layer
  - Fixed how parse errors are handled by eval()
  - Support custom reason for status header
  - Emit better error message when hhvm's systemlib doesn't load properly
  - Fixes / clarifications added to the bytecode specification
  - Lots of other bug fixes, clean up, PHP compat fixes, and JIT improvements

"Sausage" 14-Oct-2013
  - Direct invocation of callable arrays: $f = [$cls_or_obj, 'method']; $f()
  - ASAN clean
  - Support dynamically loadable extensions
  - Support loading mini-systemlibs from extensions

"Tabasco" 30-Sep-2013
  - Fix issues with __toString() functions that return non-string values
  - Don't allow mock classes to extend collection classes
  - Smarter memory allocation and scheduling for NUMA systems
  - Improve profiler performance in the jit
  - Fix several Zend compatibility issues
  - Fix several bugs uncovered by ASAN
  - Add collection support to array_keys, array_values, and array_combine
  - Return a set-like array from Set::toArray
  - Add to(Vector|Map|StableMap|Set) methods to collections
  - Collections convert to boolean false when empty
  - get_class_vars invokes the autoloader when necessary
  - Rework the Zend compatibility layer to be more robust
  - Allow traits to implement interfaces
  - Support arbitrary expressions inside empty()

"Bobotie" 16-Sep-2013
  - HNI (HipHop Native Interface) for calling C++ functions from PHP
  - Fix PropertyAccessorMap::isset
  - Expose more POSIX constants
  - Fixed behavior of stream_get_contents when default args are used.
  - Implement str_getcsv, and fix some fgetcsv related issues.
  - [IPv6] Fix stream_socket_recvfrom & stream_socket_sendto.
  - [IPv6] Fix socket_sentto_recvfrom_ipv6_udp Zend compatibility.
  - Optimize closure invocation and __invoke (~3x faster to invoke)
  - Import gettext extension
  - string and object allocation optimizations (reduced memory usage for both)
  - Import YAML extension
  - Import ftp extension

"Kimchi" 2-Sep-2013
  - Fix order of custom attributes and visibility in ctor arg promotion
  - Implement CachingIterator
  - Implement RecursiveCachingIterator
  - Generalized heuristic for choosing when to inline in the jit
  - Introduced a Zend compatibility layer to compile extensions
  - Imported calendar extension
  - Use gcc-4.8.1 by default
  - Improve hhvm command line parsing logic
  - Fix register_shutdown in session_set_save_handler to match PHP 5.4
  - Add "native" functions for use in Systemlib
  - PHP extension source-compatitblility layer
  - Fix ArrayIterator constructor PHP compatibility
  - Enable building against libmemcached 1.0.8
  - Debugger: $_ not cleared but still printed after exception
  - Fix clone of SplPriorityQueue
  - Debugger: Fix bugs when multiple threads hit the same breakpoint
  - Fix several namespace bugs
  - Several PHP compatibility fixes for ArrayObject and ArrayIterator
  - Fix list assignment with collection literals
  - support "tuple(...)" in initializer expressions
  - HHVM should compile with libmemcached 1.0.9+
  - Support "(new Vector {..})->method()" style syntax
  - use trigger_error in PHP for Redis user errors
  - multiple simplexml fixes
  - fixed serialize/unserialize for SplObjectStorage
  - Implement ReflectionParameter::IsCallable()

"Achiote" 19-Aug-2013
  - Async stack traces in the debugger via the "wa" command
  - Fix late static binding in static closures
  - Fix breakpoints on generators
  - Add SplObserver and SplSubject interfaces
  - Update Iterable interface and add toArray() method
  - Allow __get for undefined properties
  - Implement get_included_files()
  - Limit use of huge pages

"Churrasco" 05-Aug-2013
  - Implement stream_is_local
  - Implement read support for .phar
  - Implement assert with string arguments
  - Implement RecursiveArrayIterator
  - Implement php_strip_whitespace()
  - Support for timeouts in cli mode
  - Closure allocation optimizations (~2x faster to allocate a closure)
  - Implement Redis session handler
  - New memory profiler, hhprof, with pprof compatible output
  - Update isset($string[$k]) and empty($string[$k) to PHP 5.5 semantics
  - Fixed a few parser bugs
  - Fixed a few bugs with token_get_all()
  - Fix (string)$obj semantics when __toString() is not defined

"Tamale" 22-Jul-2013
  - Optimize vector-shaped Arrays (arrays with keys in range 0..size-1)
  - Enable HHBC by default in debug builds
  - Implement SplObjectStorage::getInfo()
  - Initial rough draft of xhpast2, a replacement for xhpast
  - fix compilation on Ubuntu 13.04
  - OSX changes, next round
  - Modify PHP's ext/standard/math/tests/(pow|abs).phpt to be HHVM friendly
  - add XHP comment syntax based on http://www.w3.org/TR/REC-xml/#sec-comments

"Wasabi Peas" 08-Jul-2013
  - always_assert when we run out of TC space
  - Initial changes to get HHVM compiling on OSX
  - Consolidate ObjectData and Instance
  - Prototype heap tracing framework & Heap profiler
  - Better JIT code generation for Mod and Div
  - Fixes to enable compilation with clang
  - Support for yield k => v
  - Make HHVM's command line parsing closer to PHP
  - Implement Redis extension
  - Implement LimitIterator from SPL
  - add SessionHandler from PHP 5.4
  - Numerous Debugger fixes and new developer docs for Debugger
  - Ported many extension tests to PHP