Changelog

Next Release (Tentatively 0.4) - TBD

• 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.

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.