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2008-10-16: Version 0.3.5
Improved string hash-code distribution by excluding bit-field bits from the hash-code. Changed string search algorithm used in indexOf from KMP to Boyer-Moore. Improved the generated code for the instanceof operator. Improved performance of slow-case string equality checks by specializing the code based on the string representation. Improve the handling of out-of-memory situations (issue 70). Improved performance of strict equality checks. Improved profiler output to make it easier to see anonymous functions. Improved performance of slow-case keyed loads. Improved property access performance by allocating a number of properties in the front object. Changed the toString behavior on the built-in object constructors to print [native code] instead of the actual source. Some web applications do not like constructors with complex toString results. 2008-10-06: Version 0.3.4 Changed Array.prototype.sort to use quick sort. Fixed code generation issue where leaving a finally block with break or continue would accumulate elements on the expression stack (issue 86). Made sure that the name accessor on functions returns the expected names for builtin JavaScript functions and C++ callback functions. Added fast case code for extending the property storage array of JavaScript objects. Ported switch statement optimizations introduced in version 0.3.3 to the ARM code generator. Allowed GCC to use strict-aliasing rules when compiling. Improved performance of arguments object allocation by taking care of arguments adaptor frames in the generated code. Updated the V8 benchmark suite to version 2. 2008-09-25: Version 0.3.3 Improved handling of relocation information to enable more peep-hole optimizations. Optimized switch statements where all labels are constant small integers. Optimized String.prototype.indexOf for common cases. Fixed more build issues (issue 80). Fixed a couple of profiler issues. Fixed bug where the body of a function created using the Function constructor was not allowed to end with a single-line comment (issue 85). Improved handling of object literals by canonicalizing object literal maps. This will allow JSON objects with the same set of properties to share the same map making inline caching work better for JSON objects. 2008-09-17: Version 0.3.2 Generalized the EvalCache into a CompilationCache and enabled it for scripts too. The current strategy is to retire all entries whenever a mark-sweep collection is started. Fixed bug where switch statements containing only a default case would lead to an unbalanced stack (issue 69). Fixed bug that made access to the function in a named function expression impossible in certain situations (issue 24). Fixed even more build issues. Optimized calling conventions on ARM. The conventions on ARM and IA-32 now match. Removed static initializers for flags and counters. Improved inline caching behavior for uncommon cases where lazily loading Date and RegExp code could force certain code paths go megamorphic. Removed arguments adaption for builtins written in C++. This makes Array.prototype.push and Array.prototype.pop slightly faster. 2008-09-11: Version 0.3.1 Fixed a number of build issues. Fixed problem with missing I-cache flusing on ARM. Changed space layout in memory management by splitting up code space into old data space and code space. Added utf-8 conversion support to the API (issue 57). Optimized repeated calls to eval with the same strings. These repeated calls are common in web applications. Added Xcode project file. Optimized a couple of Array operation. Fixed parser bug by checking for end-of-string when parsing break and continue (issue 35). Fixed problem where asian characters were not categorized as letters. Fixed bug that disallowed calling functions fetched from an array using a string as an array index (issue 32). Fixed bug where the internal field count on object templates were sometimes ignored (issue 54). Added -f option to the shell sample for compatibility with other engines (issue 18). Added source info to TryCatches in the API. Fixed problem where the seed for the random number generator was clipped in a double to unsigned int conversion. Fixed bug where cons string symbols were sometimes converted to non-symbol flat strings during GC. Fixed bug in error reporting when attempting to convert null to an object. 2008-09-04: Version 0.3.0 Added support for running tests on the ARM simulator. Fixed bug in the 'in' operator where negative indices were not treated correctly. Fixed build issues on gcc-4.3.1. Changed Date.prototype.toLocaleTimeString to not print the timezone part of the time. Renamed debug.h to v8-debug.h to reduce the risk of name conflicts with user code. 2008-09-02: Version 0.2.5 Renamed the top level directory 'public' to 'include'. Added 'env' option to the SCons build scripts to support overriding the ENV part of the build environment. This is mostly to support Windows builds in cases where SCons cannot find the correct paths to the Windows SDK, as these paths cannot be passed through shell environment variables. Enabled "Buffer Security Check" on for the Windows SCons build and added the linker option /OPT:ICF as an optimization. Added the V8 benchmark suite to the repository. 2008-09-01: Version 0.2.4 Included mjsunit JavaScript test suite and C++ unit tests. Changed the shell sample to not print the result of executing a script provided on the command line. Fixed issue when building samples on Windows using a shared V8 library. Added visibility option on Linux build which makes the generated library 18% smaller. Changed build system to accept multiple build modes in one build and generate separate objects, libraries and executables for each mode. Removed deferred negation optimization (a * -b => -(a * b)) since this visibly changes operand conversion order. Improved parsing performance by introducing stack guard in preparsing. Without a stack guard preparsing always bails out with stack overflow. Changed shell sample to take flags directly from the command-line. Added API call that implements this. Added load, quit and version functions to the shell sample so it's easier to run benchmarks and tests. Fixed issue with building samples and cctests on 64-bit machines. Fixed bug in the runtime system where the prototype chain was not always searched for a setter when setting a property that does not exist locally. 2008-08-14: Version 0.2.3 Improved performance of garbage collection by moving the function that updates pointers during compacting collection into the updating visitor. This gives the compiler a better chance to inline and avoid a function call per (potential) pointer. Extended the shell sample with a --runtime-flags option. Added Visual Studio project files for the shell.cc and process.cc samples. 2008-08-13: Version 0.2.2 Improved performance of garbage collection by changing the way we use the marking stack in the event of stack overflow during full garbage collection and by changing the way we mark roots. Cleaned up ARM version by removing top of stack caching and by introducing push/pop elimination. Cleaned up the way runtime functions are called to allow runtime calls with no arguments. Changed Windows build options to make sure that exceptions are disabled and that optimization flags are enabled. Added first version of Visual Studio project files. 2008-08-06: Version 0.2.1 Improved performance of unary addition by avoiding runtime calls. Fixed the handling of '>' and '<=' to use right-to-left conversion and left-to-right evaluation as specified by ECMA-262. Fixed a branch elimination bug on the ARM platform where incorrect code was generated because of overly aggressive branch elimination. Improved performance of code that repeatedly assigns the same function to the same property of different objects with the same map. Untangled DEBUG and ENABLE_DISASSEMBLER defines. The disassembler no longer expects DEBUG to be defined. Added platform-nullos.cc to serve as the basis for new platform implementations. 2008-07-30: Version 0.2.0 Changed all text files to have native svn:eol-style. Added a few samples and support for building them. The samples include a simple shell that can be used to benchmark and test V8. Changed V8::GetVersion to return the version as a string. Added source for lazily loaded scripts to snapshots and made serialization non-destructive. Improved ARM support by fixing the write barrier code to use aligned loads and stores and by removing premature locals optimization that relied on broken support for callee-saved registers (removed). Refactored the code for marking live objects during garbage collection and the code for allocating objects in paged spaces. Introduced an abstraction for the map word of a heap- allocated object and changed the memory allocator to allocate executable memory only for spaces that may contain code objects. Moved StringBuilder to utils.h and ScopedLock to platform.h, where they can be used by debugging and logging modules. Added thread-safe message queues for dealing with debugger events. Fixed the source code reported by toString for certain builtin empty functions and made sure that the prototype property of a function is enumerable. Improved performance of converting values to condition flags in generated code. Merged disassembler-{arch} files. 2008-07-28: Version 0.1.4 Added support for storing JavaScript stack traces in a stack allocated buffer to make it visible in shallow core dumps. Controlled by the --preallocate-message-memory flag which is disabled by default. 2008-07-25: Version 0.1.3 Fixed bug in JSObject::GetPropertyAttributePostInterceptor where map transitions would count as properties. Allowed aliased eval invocations by treating them as evals in the global context. This may change in the future. Added support for accessing the last entered context through the API and renamed Context::Current to Context::GetCurrent and Context::GetSecurityContext to Context::GetCurrentSecurityContext. Fixed bug in the debugger that would cause the debugger scripts to be recursively loaded and changed all disabling of interrupts to be block-structured. Made snapshot data read-only to allow it to be more easily shared across multiple users of V8 when linked as a shared library. 2008-07-16: Version 0.1.2 Fixed building on Mac OS X by recognizing i386 and friends as IA-32 platforms. Added propagation of stack overflow exceptions that occur while compiling nested functions. Improved debugger with support for recursive break points and handling of exceptions that occur in the debugger JavaScript code. Renamed GetInternal to GetInternalField and SetInternal to SetInternalField in the API and moved InternalFieldCount and SetInternalFieldCount from FunctionTemplate to ObjectTemplate. 2008-07-09: Version 0.1.1 Fixed bug in stack overflow check code for IA-32 targets where a non-tagged value in register eax was pushed to the stack. Fixed potential quadratic behavior when converting strings to numbers. Fixed bug where the return value from Object::SetProperty could end up being the property holder instead of the written value. Improved debugger support by allowing nested break points and by dealing with stack-overflows when compiling functions before setting break points in them. 2008-07-03: Version 0.1.0 Initial export. |