# Changelog ## 0.5.2 - June 5, 2017 Bug Fixes - Fixed a bug in `for-each` that was causing `length` to be executed during each iteration. ## 0.5.1 - May 24, 2017 The main focus of `0.5.1` is performance but this is also the first release to provide installation instructions for both Windows and Mac. Features - Thanks to Kashyap for adding build instructions for Windows (MSYS) and Mac! - Allow `define-c` function definitions to optionally provide an additional non-CPS form of the function. This form is more efficient and will be used by compiled code whenever possible. - Improved the compiler's CPS optimization phase to eliminate more unnecessary function calls. - Modified the GC to allow a given number of "huge" allocations to trigger GC. Previously GC was only triggered when smaller heap regions were below a certain percentage of free memory. - Compiled code now directly accesses boxed mutable variables instead of using a wrapper function. - Added command line options to `icyc` for evaluating an S-expression from the command line and for running as a script without the Cyclone banner text. Bug Fixes - Prevent potential memory corruption when working with large vectors that cannot be allocated on the stack. ## 0.5 - April 14, 2017 Features - Cyclone now has support in the interpreter for loading libraries via `import`. This is probably the most important change in this release and allows `icyc` to be used to its full potential. - Store parameter objects in such a way that changes to a parameter object do not affect other threads that use the same parameter object. The specific requirement from R7RS is: > `parameterize` must not change the associated values of any parameters in any thread other than the current thread and threads created inside the `parameterize` body. - Added bignum support to SRFI 60 - integers as bits. - Normalize the result of `string->number` such that bignums are only returned if the result truly is a bignum. - Allow Cyclone to find `(cyclone)` prefixed libraries installed in Cyclone's system folder. - Allow a library to export identifiers that are exported by another library. Previously a library could only export identifiers that it defined directly. - Raise an error if an unknown identifier is found in a library's `export` list. - Aric Belsito removed a hardcoded call to `cyclone` from the Makefile when building `generate-c`. Thanks! - Allow `cyclone` to inline character comparison functions (`char=?`, etc) when only two arguments are present, for a significant speed improvement. Bug Fixes - Prevent exception handlers from being accidentally collected when the collector cooperates on behalf of a mutator. - Fixed a regression where `string->number` returns `0` on bad input instead of `#f`. ## 0.4 - March 9, 2017 - Added a new bignum type to support exact integers of practically unlimited size. - As part of the bignum changes, modified the code for exact integer arithmetic to detect overflow. - Added documentation for the [C API](http://justinethier.github.io/cyclone/c-api/modules.html). ## 0.3.4 - February 10, 2017 Features - Koz Ross added implementations of the following SRFI's: - SRFI 28 - Basic format strings - SRFI 60 - Integers as bits - SRFI 121 - Generators - Allow a program to have more than one `import` declaration. A program can now also use `cond-expand` to selectively expand `import` declarations. - Added the `-A` and `-I` compiler options from SRFI 138 to `cyclone`: > `-A directory` > > Append directory to the list of directories that are searched in order to locate imported libraries. > > `-I directory` > > Prepend directory to the list of directories that are searched in order to locate imported libraries. - Added the `-CP`, `-CE`, and `-CL` compiler options to allow passing arbitrary flags to the C compiler: > `-CP cc-commands` > > Specify a custom command line for the C compiler to compile a program module. See Makefile.config for an example of how to construct such a command line. > > `-CE cc-commands` > > Specify a custom command line for the C compiler to compile an executable. > > `-CL cc-commands` > > Specify a custom command line for the C compiler to compile a library module. - Updated the garbage collector to enhance performance for programs with a high allocation rate, and to scale better to multiple concurrent threads. - Improved error handling by `display` and `write`. - Removed the `make_int` C macro which was deprecated and could cause problems when used in FFI functions. - Added a `with-handler` exception handler form based on the syntax from Bigloo. Bug Fixes - Thanks to Koz Ross, `equal?` has been updated to check bytevectors for deep equality. - Prevent crashes when allocating large bytevectors. - Display characters such as `#\space` correctly when output via `write`. - Thanks to Seth Alves, removed unnecessary include of `ck_string.h` which is not provided in older versions of `libck`. ## 0.3.3 - December 19, 2016 Features: - Added SRFI 113 - sets and bags. - Improved performance by more aggressively inlining primitives that work with immutable objects, such as the numeric arithmetic and comparison functions. - Allow the reader to recognize `#true` and `#false`. Bug Fixes - Prevent C compilation errors when compiling strings with special characters in them such as `#\tab`, `#\alarm`, and `#\return`. - Do not generate invalid C code when compiling `+` or `*` without any arguments. - Handle compilation of variable-argument anonymous lambdas. For example: `((lambda x x) 3 5)`. ## 0.3.2 - November 22, 2016 Features: - Recognize escaped vertical line and hex scalar value characters when reading a string. - Added `current-thread` to SRFI 18. - Added the `include` and `include-ci` macros. Bug Fixes - Fixed a crash when running `cyclone` on 32-bit platforms. ## 0.3.1 - November 20, 2016 Features: - Thanks to ecraven, added R7RS function `exact-integer-sqrt` to `(scheme base)`. - Allow the reader to recognize `+inf.0`, `-inf.0`, `+nan.0`, and `-nan.0`. - Allow `cond-expand` to test for whether a library exists using the form `(library {library name})`. - Added command line option `-O` to set the optimization level. For now there is `-O0` to disable optimizations and the default setting to enable them. Going forward there will be more fine-grained control. - Reduce size of compiled code by inlining constant values. This reduced the code size of various cyclone libraries by approximately 33%. Added other inlining as well to slightly improve performance. - Increased allocation speed when objects are moved to the heap during a major GC. Bug Fixes - Only throw a divide by zero error for integer division. Floating point divide by zero is allowed and evaluates to `nan`. - Modified SRFI 106 to be smarter about compiling `AI_V4MAPPED` and `AI_ALL`, which are not defined on OpenBSD. - Fixed the `member` functions to always return the list when a value is found, instead of `#t`. - Fixed `string->number` to return `#f` if the string cannot be converted. - Fixed a bug where the optimizer would sometimes generate incorrect code when a mutating primitive (EG: `set-car!`) was passed an expression rather than an identifier as the variable argument. - Prevent the runtime from crashing when a non-numeric value type is passed to a numeric function. ## 0.3 - October 22, 2016 Features: - Improve performance by inlining numeric arithmetic and comparison operations. - Reverted `assq`, `assv`, `memq`, and `memv` back to primitives for improved performance. In addition the compiler was modified to allow for more efficient compilation of `assoc` and `member`. - Improved library support to recognize all of the import set forms: `only`, `except`, `prefix`, and `rename`. - Allow explicit renaming macros to be declared interactively. This is the first limited support for calling `define-syntax` from `eval`. - Added the `get-environment-variables` function from R7RS. - Added support for the following SRFI's: - SRFI 106: A basic socket interface - SRFI 128: Comparators Bug Fixes - Improved macro hygiene support to properly rename temporary variables in the `let-values` macro. - Improve output of `error` by using `write` to output objects as they are represented in memory. - Check for duplicate lambda parameters during compilation. - Fixed an error that was being raised when calling `(random-source-randomize! default-random-source)` when using SRFI 27. - Raise an error if `list->string` encounters a list element that is not a character. ## 0.2 - September 7, 2016 Features: - Added the following libraries from R7RS-large red edition (data structures): - SRFI 1 list library - SRFI 133 vector library - SRFI 111 boxes - SRFI 117 mutable queues - SRFI 132 sorting library - Added SRFI 2, `and-let*` - Added `parameterize` from section 4.2.6 of R7RS to the `(scheme base)` library. - Added ` let-values` and ` let*-values` to `(scheme base)`. - Added `infinite?`, `finite?`, and `nan?` to `(scheme inexact)`. - Added string ports to `(scheme base)` - `open-input-string`, `open-output-string`, and `get-output-string`. - Added bytevector ports to `(scheme base)` - `get-output-bytevector`, `open-input-bytevector`, and `open-output-bytevector`. - Modified `cyclone` to also search the current working directory for built-in headers and libraries. Bug Fixes: - Thanks to Mark Meyer, identified and fixed several segfaults in `write` and `display`. - Updated `write` to display escaped character sequences (EG: `\t`) instead of literal characters. - Prevent C compilation errors when building a program that only contains basic primitives or a constant at the top level. - Fixed the compiler to allow application of a function that can take any number of arguments. For example: ((lambda test (write test)) 1 2 3 4) - Updated `eval` to handle functions that take an optional number of arguments. - Updated `number->string` to omit leading zeros for binary conversions. - Fixed `apply` to use the proper semantics when receiving more than one data argument. - Changed the `assoc` and `member` functions to accept an optional comparison function, and modified both families of functions to be native Scheme functions instead of C primitives. - Allow libraries to contain multiple `import`, `begin`, and `export` sections.