package bin_prot

113.43.00

• Converted bin_prot to use %expect tests. No functional changes.
• Added Maximum and Minimum submodules to Size so to allow for easy estimation of the space required for simple bin_prot'ed types.
• Binable.S_only_functions
• Fix various bin_prot issue in 32bit architectures

113.24.00

• Bin_prot can be configured to use the primitives to read/write integers from bigarrays. This was never enabled due to missing tests that selecting this code path doesn't change the format.

  This version add these tests and enable the use of the fast primitives.

• Add benchmarks for all exposed bin_prot read/write functions. These are intended to check performance regressions.

• Remove most use of cpp in bin_prot.

  Replace the pre-processor conditionals by runtime one. This make the code a little less obfuscated.

• Remove big literals so that the compiler does not complain in 32bit

113.00.00

• Switched build to use =config.h= rather than the command-line for preprocessor variables.
• Switched from ARCH_SIXTYFOUR to JSC_ARCH_SIXTYFOUR.

• Fixed to support 32-bit integers, which are used in js_of_ocaml.

  Do not make too many assumptions on integer size. Integers are 32bit in Javascript.

  Do not use the "get_float_offset" hack on 32bit as it cannot be implemented in javascript.

112.35.00

• Sped up bin_io of float array.

  Bin_prot already had special fast handling for float array's but with bin_io did not use it except for the special type float_array. Now, there is fast handling for float array and its aliases, for example price array when type price = float.

  • Changed Size.bin_size_array, Write.bin_write_array and Read.bin_read_array short circuit to the fast path when it detects that float array is handled. Each of these functions receives a function for handling array elements and short circuits when the function for handling elements is equal to the function for handling floats, using physical equality of closures.
  • To cause short circuiting for aliases of float, changed bin_io so that aliased bin_io functions are equal the the bin_io functions of the original type. That is an optimization for itself regardless whether it's used for float. Before this change, every function generated for aliases were eta-expanded leading to different closures at runtime for each type.

  Short circuiting needs to apply to the handling function rather than to the value at hand because:

  • the value is available only in size and write, and we need a way to make read work as well.
  • even when the value is a float at runtime, the handling of a specific float alias may have been overridden by a custom one.

  Made a slight improvement to bin_read_float_array: since the array is going to be filled with read values, there is no need to fill it with 0. after allocation:

            let next = pos + size in
      check_next buf next;
  -|  let arr = Array.create len 0. in
  +|  let arr = Array.make_float len in
      unsafe_blit_buf_float_array buf arr ~src_pos:pos ~dst_pos:0 ~len;
      pos_ref := next;

  The difference in speed when optimal and non optimal way of handling floats is used:

  Name	Time/Run	mWd/Run	mjWd/Run
  [bench.ml:float array] size non optimal	3_403.80ns	2_000.00w
  [bench.ml:float array] size float_array	5.55ns
  [bench.ml:float array] size Price.t array	6.18ns
  [bench.ml:float array] write non optimal	7_839.89ns	2_000.00w
  [bench.ml:float array] write float_array	292.42ns
  [bench.ml:float array] write Price.t array	293.16ns
  [bench.ml:float array] read non optimal	9_665.06ns	2_002.00w	1.00kw
  [bench.ml:float array] read float_array	461.01ns	2.00w	1.00kw
  [bench.ml:float array] read Price.t array	449.43ns	2.00w	1.00kw

  There is no observed speed penalty for runtime check for short circuiting. The following benchmark shows the speed of handling int array without and with the check:

  Name	Time/Run	mWd/Run	mjWd/Run
  [bench.ml:float array] int array size	3_910.64ns
  [bench.ml:float array] int array write	6_548.40ns
  [bench.ml:float array] int array read	14_928.11ns	2.00w	1.00kw

  Name	Time/Run	mWd/Run	mjWd/Run
  [bench.ml:float array] int array size	3_906.86ns
  [bench.ml:float array] int array write	5_874.63ns
  [bench.ml:float array] int array read	14_225.06ns	2.00w	1.00kw

112.24.00

Minor commit: comments.

112.17.00

• Added Bin_prot.Blob, formerly known as Core_extended.Wrapped, which has efficient handling of size-prefixed bin-io values in cases where serialization can be bypassed.

112.06.00

• Sped up float and float array operations.

• Removed a use of Obj.magic in code generated by pa_bin_prot for polymorphic variants that led to memory unsafety.

  Previously, pa_bin_prot generated this kind of code for polymorphic variants:

        match Obj.magic (read_int buf pos) with
  | `A as x -> x
  | `B as x -> x
  | `C -> `C (read_float buf pos)
  | _ -> fail

  and this caused the compiler to assume the result is an immediate value. To fix this we removed the as x -> x and used the computed integer hash.

112.01.00

• In Write, improved some OCaml macros to name values and avoid calling C functions multiple times.

111.03.00

• Fixed build on ARM.

109.53.00

• Bump version number

109.47.00

• Compilation fix for 32-bit systems

109.44.00

• Remove "unwrapped" pointers used by Bin_prot, with the bug from 109.41 fixed.

  Unwrapped pointers cannot coexist with the remove-page-table optimization.

  Removed all the C stubs for reading/writing and used instead either the new primitives of the next OCaml or standard OCaml code reading/writing integers byte by byte.

  Since we don't have unsafe/safe functions anymore but only safe ones, removed all the bin_{read,write}_t_ functions.

  Also renamed bin_read_t__ to __bin_read_t__ for the same reason as sexplib: to avoid confusion with the function generated for t_ and hide it in the toplevel.

109.42.00

• Backed out the changes introduced in 109.41

109.41.00

• Remove all uses of "unwrapped" pointers

  Unwrapped pointers cannot coexist with the remove-page-table optimization.

  Removed all the C stubs for reading/writing and used instead either the new primitives of the next OCaml or standard OCaml code reading/writing integers byte by byte.

  Since we don't have unsafe/safe functions anymore but only safe ones, removed all the bin_{read,write}_t_ functions.

  Also renamed bin_read_t__ to __bin_read_t__ for the same reason as sexplib: to avoid confusion with the function generated for t_ and hide it in the toplevel.

109.10.00

• Improved error messages in presence of GADTs.

2012-07-15

• Rewrote README in Markdown and improved documentation.
• Eliminated new warnings available in OCaml 4.00.

2012-02-28

• Improved portability by better supporting the C99-standard and non-GNU compilers.

2011-11-10

• Improved portability to older glibc distributions.

2011-09-15

• Fixes to improve package dependency resolution.

2011-07-04

• Internal updates to sync with Jane Street.

2011-06-29

• Fixed bigstring layout bug, which should only affect value comparisons with OCaml 3.12.1 or later.
• Made 64-bit detection more reliable on Mac OS X.

2010-03-20

• Fixed linking of toplevels to require bigarrays.
• Improved compilation on Mac OS X.

2010-03-17

• Fixed small name capture bug.

2009-12-21

• Updated contact information.

2009-09-19

• Added missing type cases for supporting variant types.
• Fixed handling of variance annotations.

2009-07-27

• Fixed build problem with gcc 4.4 due to stricter checking for empty macro arguments.

  Thanks to Nobuyuki Tomiza nobuyuki.tomizawa@gmail.com for the patch!

2009-07-20

• Merged tiny Jane Street improvements.

2009-07-03

• Made byte swapping more portable.

2009-07-02

• Added support for network byte order integers.

2009-04-22

• Added macro support for all kinds of vectors (vec, float32_vec, float64_vec) and matrices (mat, float32_mat, float64_mat), and for bigstrings (bigstring).

2009-04-16

• Fixed a bug leading to an exception when writing extremely large values (>4 GB buffer size). Does not cause data corruption.